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; 165 int ttl, err = 0; 166 167 local_bh_disable(); 168 ndst = dst_cache_get(cache); 169 if (dst->proto == htons(ETH_P_IP)) { 170 struct rtable *rt = (struct rtable *)ndst; 171 172 if (!rt) { 173 struct flowi4 fl = { 174 .daddr = dst->ipv4.s_addr, 175 .saddr = src->ipv4.s_addr, 176 .flowi4_mark = skb->mark, 177 .flowi4_proto = IPPROTO_UDP 178 }; 179 rt = ip_route_output_key(net, &fl); 180 if (IS_ERR(rt)) { 181 err = PTR_ERR(rt); 182 goto tx_error; 183 } 184 dst_cache_set_ip4(cache, &rt->dst, fl.saddr); 185 } 186 187 ttl = ip4_dst_hoplimit(&rt->dst); 188 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, 189 dst->ipv4.s_addr, 0, ttl, 0, src->port, 190 dst->port, false, true); 191 #if IS_ENABLED(CONFIG_IPV6) 192 } else { 193 if (!ndst) { 194 struct flowi6 fl6 = { 195 .flowi6_oif = ub->ifindex, 196 .daddr = dst->ipv6, 197 .saddr = src->ipv6, 198 .flowi6_proto = IPPROTO_UDP 199 }; 200 ndst = ipv6_stub->ipv6_dst_lookup_flow(net, 201 ub->ubsock->sk, 202 &fl6, NULL); 203 if (IS_ERR(ndst)) { 204 err = PTR_ERR(ndst); 205 goto tx_error; 206 } 207 dst_cache_set_ip6(cache, ndst, &fl6.saddr); 208 } 209 ttl = ip6_dst_hoplimit(ndst); 210 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL, 211 &src->ipv6, &dst->ipv6, 0, ttl, 0, 212 src->port, dst->port, false); 213 #endif 214 } 215 local_bh_enable(); 216 return err; 217 218 tx_error: 219 local_bh_enable(); 220 kfree_skb(skb); 221 return err; 222 } 223 224 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 225 struct tipc_bearer *b, 226 struct tipc_media_addr *addr) 227 { 228 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 229 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; 230 struct udp_replicast *rcast; 231 struct udp_bearer *ub; 232 int err = 0; 233 234 if (skb_headroom(skb) < UDP_MIN_HEADROOM) { 235 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); 236 if (err) 237 goto out; 238 } 239 240 skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); 241 ub = rcu_dereference(b->media_ptr); 242 if (!ub) { 243 err = -ENODEV; 244 goto out; 245 } 246 247 if (addr->broadcast != TIPC_REPLICAST_SUPPORT) 248 return tipc_udp_xmit(net, skb, ub, src, dst, 249 &ub->rcast.dst_cache); 250 251 /* Replicast, send an skb to each configured IP address */ 252 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { 253 struct sk_buff *_skb; 254 255 _skb = pskb_copy(skb, GFP_ATOMIC); 256 if (!_skb) { 257 err = -ENOMEM; 258 goto out; 259 } 260 261 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr, 262 &rcast->dst_cache); 263 if (err) 264 goto out; 265 } 266 err = 0; 267 out: 268 kfree_skb(skb); 269 return err; 270 } 271 272 static bool tipc_udp_is_known_peer(struct tipc_bearer *b, 273 struct udp_media_addr *addr) 274 { 275 struct udp_replicast *rcast, *tmp; 276 struct udp_bearer *ub; 277 278 ub = rcu_dereference_rtnl(b->media_ptr); 279 if (!ub) { 280 pr_err_ratelimited("UDP bearer instance not found\n"); 281 return false; 282 } 283 284 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 285 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) 286 return true; 287 } 288 289 return false; 290 } 291 292 static int tipc_udp_rcast_add(struct tipc_bearer *b, 293 struct udp_media_addr *addr) 294 { 295 struct udp_replicast *rcast; 296 struct udp_bearer *ub; 297 298 ub = rcu_dereference_rtnl(b->media_ptr); 299 if (!ub) 300 return -ENODEV; 301 302 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC); 303 if (!rcast) 304 return -ENOMEM; 305 306 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) { 307 kfree(rcast); 308 return -ENOMEM; 309 } 310 311 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); 312 313 if (ntohs(addr->proto) == ETH_P_IP) 314 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); 315 #if IS_ENABLED(CONFIG_IPV6) 316 else if (ntohs(addr->proto) == ETH_P_IPV6) 317 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); 318 #endif 319 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 320 list_add_rcu(&rcast->list, &ub->rcast.list); 321 return 0; 322 } 323 324 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) 325 { 326 struct udp_media_addr src = {0}; 327 struct udp_media_addr *dst; 328 329 dst = (struct udp_media_addr *)&b->bcast_addr.value; 330 if (tipc_udp_is_mcast_addr(dst)) 331 return 0; 332 333 src.port = udp_hdr(skb)->source; 334 335 if (ip_hdr(skb)->version == 4) { 336 struct iphdr *iphdr = ip_hdr(skb); 337 338 src.proto = htons(ETH_P_IP); 339 src.ipv4.s_addr = iphdr->saddr; 340 if (ipv4_is_multicast(iphdr->daddr)) 341 return 0; 342 #if IS_ENABLED(CONFIG_IPV6) 343 } else if (ip_hdr(skb)->version == 6) { 344 struct ipv6hdr *iphdr = ipv6_hdr(skb); 345 346 src.proto = htons(ETH_P_IPV6); 347 src.ipv6 = iphdr->saddr; 348 if (ipv6_addr_is_multicast(&iphdr->daddr)) 349 return 0; 350 #endif 351 } else { 352 return 0; 353 } 354 355 if (likely(tipc_udp_is_known_peer(b, &src))) 356 return 0; 357 358 return tipc_udp_rcast_add(b, &src); 359 } 360 361 /* tipc_udp_recv - read data from bearer socket */ 362 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) 363 { 364 struct udp_bearer *ub; 365 struct tipc_bearer *b; 366 struct tipc_msg *hdr; 367 int err; 368 369 ub = rcu_dereference_sk_user_data(sk); 370 if (!ub) { 371 pr_err_ratelimited("Failed to get UDP bearer reference"); 372 goto out; 373 } 374 skb_pull(skb, sizeof(struct udphdr)); 375 hdr = buf_msg(skb); 376 377 b = rcu_dereference(ub->bearer); 378 if (!b) 379 goto out; 380 381 if (b && test_bit(0, &b->up)) { 382 TIPC_SKB_CB(skb)->flags = 0; 383 tipc_rcv(sock_net(sk), skb, b); 384 return 0; 385 } 386 387 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 388 err = tipc_udp_rcast_disc(b, skb); 389 if (err) 390 goto out; 391 } 392 393 out: 394 kfree_skb(skb); 395 return 0; 396 } 397 398 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 399 { 400 int err = 0; 401 struct ip_mreqn mreqn; 402 struct sock *sk = ub->ubsock->sk; 403 404 if (ntohs(remote->proto) == ETH_P_IP) { 405 mreqn.imr_multiaddr = remote->ipv4; 406 mreqn.imr_ifindex = ub->ifindex; 407 err = ip_mc_join_group(sk, &mreqn); 408 #if IS_ENABLED(CONFIG_IPV6) 409 } else { 410 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 411 &remote->ipv6); 412 #endif 413 } 414 return err; 415 } 416 417 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 418 struct udp_media_addr *addr, int nla_t) 419 { 420 if (ntohs(addr->proto) == ETH_P_IP) { 421 struct sockaddr_in ip4; 422 423 memset(&ip4, 0, sizeof(ip4)); 424 ip4.sin_family = AF_INET; 425 ip4.sin_port = addr->port; 426 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 427 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 428 return -EMSGSIZE; 429 430 #if IS_ENABLED(CONFIG_IPV6) 431 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 432 struct sockaddr_in6 ip6; 433 434 memset(&ip6, 0, sizeof(ip6)); 435 ip6.sin6_family = AF_INET6; 436 ip6.sin6_port = addr->port; 437 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 438 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 439 return -EMSGSIZE; 440 #endif 441 } 442 443 return 0; 444 } 445 446 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 447 { 448 u32 bid = cb->args[0]; 449 u32 skip_cnt = cb->args[1]; 450 u32 portid = NETLINK_CB(cb->skb).portid; 451 struct udp_replicast *rcast, *tmp; 452 struct tipc_bearer *b; 453 struct udp_bearer *ub; 454 void *hdr; 455 int err; 456 int i; 457 458 if (!bid && !skip_cnt) { 459 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 460 struct net *net = sock_net(skb->sk); 461 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 462 char *bname; 463 464 if (!attrs[TIPC_NLA_BEARER]) 465 return -EINVAL; 466 467 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, 468 attrs[TIPC_NLA_BEARER], 469 tipc_nl_bearer_policy, NULL); 470 if (err) 471 return err; 472 473 if (!battrs[TIPC_NLA_BEARER_NAME]) 474 return -EINVAL; 475 476 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 477 478 rtnl_lock(); 479 b = tipc_bearer_find(net, bname); 480 if (!b) { 481 rtnl_unlock(); 482 return -EINVAL; 483 } 484 bid = b->identity; 485 } else { 486 struct net *net = sock_net(skb->sk); 487 struct tipc_net *tn = net_generic(net, tipc_net_id); 488 489 rtnl_lock(); 490 b = rtnl_dereference(tn->bearer_list[bid]); 491 if (!b) { 492 rtnl_unlock(); 493 return -EINVAL; 494 } 495 } 496 497 ub = rtnl_dereference(b->media_ptr); 498 if (!ub) { 499 rtnl_unlock(); 500 return -EINVAL; 501 } 502 503 i = 0; 504 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 505 if (i < skip_cnt) 506 goto count; 507 508 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 509 &tipc_genl_family, NLM_F_MULTI, 510 TIPC_NL_BEARER_GET); 511 if (!hdr) 512 goto done; 513 514 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 515 TIPC_NLA_UDP_REMOTE); 516 if (err) { 517 genlmsg_cancel(skb, hdr); 518 goto done; 519 } 520 genlmsg_end(skb, hdr); 521 count: 522 i++; 523 } 524 done: 525 rtnl_unlock(); 526 cb->args[0] = bid; 527 cb->args[1] = i; 528 529 return skb->len; 530 } 531 532 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 533 { 534 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 535 struct udp_media_addr *dst; 536 struct udp_bearer *ub; 537 struct nlattr *nest; 538 539 ub = rtnl_dereference(b->media_ptr); 540 if (!ub) 541 return -ENODEV; 542 543 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 544 if (!nest) 545 goto msg_full; 546 547 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 548 goto msg_full; 549 550 dst = (struct udp_media_addr *)&b->bcast_addr.value; 551 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 552 goto msg_full; 553 554 if (!list_empty(&ub->rcast.list)) { 555 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 556 goto msg_full; 557 } 558 559 nla_nest_end(msg->skb, nest); 560 return 0; 561 msg_full: 562 nla_nest_cancel(msg->skb, nest); 563 return -EMSGSIZE; 564 } 565 566 /** 567 * tipc_parse_udp_addr - build udp media address from netlink data 568 * @nla: netlink attribute containing sockaddr storage aligned address 569 * @addr: tipc media address to fill with address, port and protocol type 570 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 571 */ 572 573 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 574 u32 *scope_id) 575 { 576 struct sockaddr_storage sa; 577 578 nla_memcpy(&sa, nla, sizeof(sa)); 579 if (sa.ss_family == AF_INET) { 580 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 581 582 addr->proto = htons(ETH_P_IP); 583 addr->port = ip4->sin_port; 584 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 585 return 0; 586 587 #if IS_ENABLED(CONFIG_IPV6) 588 } else if (sa.ss_family == AF_INET6) { 589 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 590 591 addr->proto = htons(ETH_P_IPV6); 592 addr->port = ip6->sin6_port; 593 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 594 595 /* Scope ID is only interesting for local addresses */ 596 if (scope_id) { 597 int atype; 598 599 atype = ipv6_addr_type(&ip6->sin6_addr); 600 if (__ipv6_addr_needs_scope_id(atype) && 601 !ip6->sin6_scope_id) { 602 return -EINVAL; 603 } 604 605 *scope_id = ip6->sin6_scope_id ? : 0; 606 } 607 608 return 0; 609 #endif 610 } 611 return -EADDRNOTAVAIL; 612 } 613 614 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 615 { 616 int err; 617 struct udp_media_addr addr = {0}; 618 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 619 struct udp_media_addr *dst; 620 621 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL)) 622 return -EINVAL; 623 624 if (!opts[TIPC_NLA_UDP_REMOTE]) 625 return -EINVAL; 626 627 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 628 if (err) 629 return err; 630 631 dst = (struct udp_media_addr *)&b->bcast_addr.value; 632 if (tipc_udp_is_mcast_addr(dst)) { 633 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 634 return -EINVAL; 635 } 636 637 if (tipc_udp_is_known_peer(b, &addr)) 638 return 0; 639 640 return tipc_udp_rcast_add(b, &addr); 641 } 642 643 /** 644 * tipc_udp_enable - callback to create a new udp bearer instance 645 * @net: network namespace 646 * @b: pointer to generic tipc_bearer 647 * @attrs: netlink bearer configuration 648 * 649 * validate the bearer parameters and initialize the udp bearer 650 * rtnl_lock should be held 651 */ 652 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 653 struct nlattr *attrs[]) 654 { 655 int err = -EINVAL; 656 struct udp_bearer *ub; 657 struct udp_media_addr remote = {0}; 658 struct udp_media_addr local = {0}; 659 struct udp_port_cfg udp_conf = {0}; 660 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 661 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 662 u8 node_id[NODE_ID_LEN] = {0,}; 663 struct net_device *dev; 664 int rmcast = 0; 665 666 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 667 if (!ub) 668 return -ENOMEM; 669 670 INIT_LIST_HEAD(&ub->rcast.list); 671 672 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 673 goto err; 674 675 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 676 goto err; 677 678 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 679 pr_err("Invalid UDP bearer configuration"); 680 err = -EINVAL; 681 goto err; 682 } 683 684 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 685 &ub->ifindex); 686 if (err) 687 goto err; 688 689 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 690 if (err) 691 goto err; 692 693 if (remote.proto != local.proto) { 694 err = -EINVAL; 695 goto err; 696 } 697 698 /* Checking remote ip address */ 699 rmcast = tipc_udp_is_mcast_addr(&remote); 700 701 /* Autoconfigure own node identity if needed */ 702 if (!tipc_own_id(net)) { 703 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 704 tipc_net_init(net, node_id, 0); 705 } 706 if (!tipc_own_id(net)) { 707 pr_warn("Failed to set node id, please configure manually\n"); 708 err = -EINVAL; 709 goto err; 710 } 711 712 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 713 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 714 rcu_assign_pointer(b->media_ptr, ub); 715 rcu_assign_pointer(ub->bearer, b); 716 tipc_udp_media_addr_set(&b->addr, &local); 717 if (local.proto == htons(ETH_P_IP)) { 718 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 719 if (!dev) { 720 err = -ENODEV; 721 goto err; 722 } 723 udp_conf.family = AF_INET; 724 725 /* Switch to use ANY to receive packets from group */ 726 if (rmcast) 727 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 728 else 729 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 730 udp_conf.use_udp_checksums = false; 731 ub->ifindex = dev->ifindex; 732 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 733 sizeof(struct udphdr))) { 734 err = -EINVAL; 735 goto err; 736 } 737 b->mtu = b->media->mtu; 738 #if IS_ENABLED(CONFIG_IPV6) 739 } else if (local.proto == htons(ETH_P_IPV6)) { 740 dev = ub->ifindex ? __dev_get_by_index(net, ub->ifindex) : NULL; 741 dev = ipv6_dev_find(net, &local.ipv6, dev); 742 if (!dev) { 743 err = -ENODEV; 744 goto err; 745 } 746 udp_conf.family = AF_INET6; 747 udp_conf.use_udp6_tx_checksums = true; 748 udp_conf.use_udp6_rx_checksums = true; 749 if (rmcast) 750 udp_conf.local_ip6 = in6addr_any; 751 else 752 udp_conf.local_ip6 = local.ipv6; 753 ub->ifindex = dev->ifindex; 754 b->mtu = 1280; 755 #endif 756 } else { 757 err = -EAFNOSUPPORT; 758 goto err; 759 } 760 udp_conf.local_udp_port = local.port; 761 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 762 if (err) 763 goto err; 764 tuncfg.sk_user_data = ub; 765 tuncfg.encap_type = 1; 766 tuncfg.encap_rcv = tipc_udp_recv; 767 tuncfg.encap_destroy = NULL; 768 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 769 770 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); 771 if (err) 772 goto free; 773 774 /** 775 * The bcast media address port is used for all peers and the ip 776 * is used if it's a multicast address. 777 */ 778 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 779 if (rmcast) 780 err = enable_mcast(ub, &remote); 781 else 782 err = tipc_udp_rcast_add(b, &remote); 783 if (err) 784 goto free; 785 786 return 0; 787 788 free: 789 dst_cache_destroy(&ub->rcast.dst_cache); 790 udp_tunnel_sock_release(ub->ubsock); 791 err: 792 kfree(ub); 793 return err; 794 } 795 796 /* cleanup_bearer - break the socket/bearer association */ 797 static void cleanup_bearer(struct work_struct *work) 798 { 799 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 800 struct udp_replicast *rcast, *tmp; 801 802 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 803 dst_cache_destroy(&rcast->dst_cache); 804 list_del_rcu(&rcast->list); 805 kfree_rcu(rcast, rcu); 806 } 807 808 dst_cache_destroy(&ub->rcast.dst_cache); 809 udp_tunnel_sock_release(ub->ubsock); 810 synchronize_net(); 811 kfree(ub); 812 } 813 814 /* tipc_udp_disable - detach bearer from socket */ 815 static void tipc_udp_disable(struct tipc_bearer *b) 816 { 817 struct udp_bearer *ub; 818 819 ub = rtnl_dereference(b->media_ptr); 820 if (!ub) { 821 pr_err("UDP bearer instance not found\n"); 822 return; 823 } 824 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 825 RCU_INIT_POINTER(ub->bearer, NULL); 826 827 /* sock_release need to be done outside of rtnl lock */ 828 INIT_WORK(&ub->work, cleanup_bearer); 829 schedule_work(&ub->work); 830 } 831 832 struct tipc_media udp_media_info = { 833 .send_msg = tipc_udp_send_msg, 834 .enable_media = tipc_udp_enable, 835 .disable_media = tipc_udp_disable, 836 .addr2str = tipc_udp_addr2str, 837 .addr2msg = tipc_udp_addr2msg, 838 .msg2addr = tipc_udp_msg2addr, 839 .priority = TIPC_DEF_LINK_PRI, 840 .tolerance = TIPC_DEF_LINK_TOL, 841 .min_win = TIPC_DEF_LINK_WIN, 842 .max_win = TIPC_DEF_LINK_WIN, 843 .mtu = TIPC_DEF_LINK_UDP_MTU, 844 .type_id = TIPC_MEDIA_TYPE_UDP, 845 .hwaddr_len = 0, 846 .name = "udp" 847 }; 848