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/wait_bit.h> 44 #include <linux/list.h> 45 #include <net/sock.h> 46 #include <net/ip.h> 47 #include <net/udp_tunnel.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 #include "udp_media.h" 56 57 /* IANA assigned UDP port */ 58 #define UDP_PORT_DEFAULT 6118 59 60 #define UDP_MIN_HEADROOM 48 61 62 /** 63 * struct udp_media_addr - IP/UDP addressing information 64 * 65 * This is the bearer level originating address used in neighbor discovery 66 * messages, and all fields should be in network byte order 67 * 68 * @proto: Ethernet protocol in use 69 * @port: port being used 70 * @ipv4: IPv4 address of neighbor 71 * @ipv6: IPv6 address of neighbor 72 */ 73 struct udp_media_addr { 74 __be16 proto; 75 __be16 port; 76 union { 77 struct in_addr ipv4; 78 struct in6_addr ipv6; 79 }; 80 }; 81 82 /* struct udp_replicast - container for UDP remote addresses */ 83 struct udp_replicast { 84 struct udp_media_addr addr; 85 struct dst_cache dst_cache; 86 struct rcu_head rcu; 87 struct list_head list; 88 }; 89 90 /** 91 * struct udp_bearer - ip/udp bearer data structure 92 * @bearer: associated generic tipc bearer 93 * @sk: bearer associated socket 94 * @ifindex: local address scope 95 * @work: used to schedule deferred work on a bearer 96 * @rcast: associated udp_replicast container 97 */ 98 struct udp_bearer { 99 struct tipc_bearer __rcu *bearer; 100 struct sock *sk; 101 u32 ifindex; 102 struct work_struct work; 103 struct udp_replicast rcast; 104 }; 105 106 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr) 107 { 108 if (ntohs(addr->proto) == ETH_P_IP) 109 return ipv4_is_multicast(addr->ipv4.s_addr); 110 #if IS_ENABLED(CONFIG_IPV6) 111 else 112 return ipv6_addr_is_multicast(&addr->ipv6); 113 #endif 114 return 0; 115 } 116 117 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ 118 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, 119 struct udp_media_addr *ua) 120 { 121 memset(addr, 0, sizeof(struct tipc_media_addr)); 122 addr->media_id = TIPC_MEDIA_TYPE_UDP; 123 memcpy(addr->value, ua, sizeof(struct udp_media_addr)); 124 125 if (tipc_udp_is_mcast_addr(ua)) 126 addr->broadcast = TIPC_BROADCAST_SUPPORT; 127 } 128 129 /* tipc_udp_addr2str - convert ip/udp address to string */ 130 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) 131 { 132 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; 133 134 if (ntohs(ua->proto) == ETH_P_IP) 135 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port)); 136 else if (ntohs(ua->proto) == ETH_P_IPV6) 137 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port)); 138 else { 139 pr_err("Invalid UDP media address\n"); 140 return 1; 141 } 142 143 return 0; 144 } 145 146 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ 147 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, 148 char *msg) 149 { 150 struct udp_media_addr *ua; 151 152 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); 153 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) 154 return -EINVAL; 155 tipc_udp_media_addr_set(a, ua); 156 return 0; 157 } 158 159 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ 160 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) 161 { 162 memset(msg, 0, TIPC_MEDIA_INFO_SIZE); 163 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; 164 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, 165 sizeof(struct udp_media_addr)); 166 return 0; 167 } 168 169 /* tipc_send_msg - enqueue a send request */ 170 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, 171 struct udp_bearer *ub, struct udp_media_addr *src, 172 struct udp_media_addr *dst, struct dst_cache *cache) 173 { 174 struct dst_entry *ndst; 175 int ttl, err; 176 177 local_bh_disable(); 178 ndst = dst_cache_get(cache); 179 if (dst->proto == htons(ETH_P_IP)) { 180 struct rtable *rt = dst_rtable(ndst); 181 182 if (!rt) { 183 struct flowi4 fl = { 184 .daddr = dst->ipv4.s_addr, 185 .saddr = src->ipv4.s_addr, 186 .flowi4_mark = skb->mark, 187 .flowi4_proto = IPPROTO_UDP 188 }; 189 rt = ip_route_output_key(net, &fl); 190 if (IS_ERR(rt)) { 191 err = PTR_ERR(rt); 192 goto tx_error; 193 } 194 dst_cache_set_ip4(cache, &rt->dst, fl.saddr); 195 } 196 197 ttl = ip4_dst_hoplimit(&rt->dst); 198 udp_tunnel_xmit_skb(rt, ub->sk, skb, src->ipv4.s_addr, 199 dst->ipv4.s_addr, 0, ttl, 0, src->port, 200 dst->port, false, true, 0); 201 #if IS_ENABLED(CONFIG_IPV6) 202 } else { 203 if (!ndst) { 204 struct flowi6 fl6 = { 205 .flowi6_oif = ub->ifindex, 206 .daddr = dst->ipv6, 207 .saddr = src->ipv6, 208 .flowi6_proto = IPPROTO_UDP 209 }; 210 ndst = ip6_dst_lookup_flow(net, ub->sk, 211 &fl6, NULL); 212 if (IS_ERR(ndst)) { 213 err = PTR_ERR(ndst); 214 goto tx_error; 215 } 216 dst_cache_set_ip6(cache, ndst, &fl6.saddr); 217 } 218 ttl = ip6_dst_hoplimit(ndst); 219 udp_tunnel6_xmit_skb(ndst, ub->sk, skb, NULL, 220 &src->ipv6, &dst->ipv6, 0, ttl, 0, 221 src->port, dst->port, false, 0); 222 #endif 223 } 224 local_bh_enable(); 225 return 0; 226 227 tx_error: 228 local_bh_enable(); 229 kfree_skb(skb); 230 return err; 231 } 232 233 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 234 struct tipc_bearer *b, 235 struct tipc_media_addr *addr) 236 { 237 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 238 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; 239 struct udp_replicast *rcast; 240 struct udp_bearer *ub; 241 int err = 0; 242 243 if (skb_headroom(skb) < UDP_MIN_HEADROOM) { 244 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); 245 if (err) 246 goto out; 247 } 248 249 skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); 250 ub = rcu_dereference(b->media_ptr); 251 if (!ub) { 252 err = -ENODEV; 253 goto out; 254 } 255 256 if (addr->broadcast != TIPC_REPLICAST_SUPPORT) 257 return tipc_udp_xmit(net, skb, ub, src, dst, 258 &ub->rcast.dst_cache); 259 260 /* Replicast, send an skb to each configured IP address */ 261 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { 262 struct sk_buff *_skb; 263 264 _skb = pskb_copy(skb, GFP_ATOMIC); 265 if (!_skb) { 266 err = -ENOMEM; 267 goto out; 268 } 269 270 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr, 271 &rcast->dst_cache); 272 if (err) 273 goto out; 274 } 275 err = 0; 276 out: 277 kfree_skb(skb); 278 return err; 279 } 280 281 static bool tipc_udp_is_known_peer(struct tipc_bearer *b, 282 struct udp_media_addr *addr) 283 { 284 struct udp_replicast *rcast, *tmp; 285 struct udp_bearer *ub; 286 287 ub = rcu_dereference_rtnl(b->media_ptr); 288 if (!ub) { 289 pr_err_ratelimited("UDP bearer instance not found\n"); 290 return false; 291 } 292 293 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 294 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) 295 return true; 296 } 297 298 return false; 299 } 300 301 static int tipc_udp_rcast_add(struct tipc_bearer *b, 302 struct udp_media_addr *addr) 303 { 304 struct udp_replicast *rcast; 305 struct udp_bearer *ub; 306 307 ub = rcu_dereference_rtnl(b->media_ptr); 308 if (!ub) 309 return -ENODEV; 310 311 rcast = kmalloc_obj(*rcast, GFP_ATOMIC); 312 if (!rcast) 313 return -ENOMEM; 314 315 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) { 316 kfree(rcast); 317 return -ENOMEM; 318 } 319 320 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); 321 322 if (ntohs(addr->proto) == ETH_P_IP) 323 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); 324 #if IS_ENABLED(CONFIG_IPV6) 325 else if (ntohs(addr->proto) == ETH_P_IPV6) 326 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); 327 #endif 328 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 329 list_add_rcu(&rcast->list, &ub->rcast.list); 330 return 0; 331 } 332 333 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) 334 { 335 struct udp_media_addr src = {0}; 336 struct udp_media_addr *dst; 337 338 dst = (struct udp_media_addr *)&b->bcast_addr.value; 339 if (tipc_udp_is_mcast_addr(dst)) 340 return 0; 341 342 src.port = udp_hdr(skb)->source; 343 344 if (ip_hdr(skb)->version == 4) { 345 struct iphdr *iphdr = ip_hdr(skb); 346 347 src.proto = htons(ETH_P_IP); 348 src.ipv4.s_addr = iphdr->saddr; 349 if (ipv4_is_multicast(iphdr->daddr)) 350 return 0; 351 #if IS_ENABLED(CONFIG_IPV6) 352 } else if (ip_hdr(skb)->version == 6) { 353 struct ipv6hdr *iphdr = ipv6_hdr(skb); 354 355 src.proto = htons(ETH_P_IPV6); 356 src.ipv6 = iphdr->saddr; 357 if (ipv6_addr_is_multicast(&iphdr->daddr)) 358 return 0; 359 #endif 360 } else { 361 return 0; 362 } 363 364 if (likely(tipc_udp_is_known_peer(b, &src))) 365 return 0; 366 367 return tipc_udp_rcast_add(b, &src); 368 } 369 370 /* tipc_udp_recv - read data from bearer socket */ 371 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) 372 { 373 struct udp_bearer *ub; 374 struct tipc_bearer *b; 375 struct tipc_msg *hdr; 376 int err; 377 378 ub = rcu_dereference_sk_user_data(sk); 379 if (!ub) { 380 pr_err_ratelimited("Failed to get UDP bearer reference"); 381 goto out; 382 } 383 skb_pull(skb, sizeof(struct udphdr)); 384 hdr = buf_msg(skb); 385 386 b = rcu_dereference(ub->bearer); 387 if (!b) 388 goto out; 389 390 if (b && test_bit(0, &b->up)) { 391 TIPC_SKB_CB(skb)->flags = 0; 392 tipc_rcv(sock_net(sk), skb, b); 393 return 0; 394 } 395 396 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 397 err = tipc_udp_rcast_disc(b, skb); 398 if (err) 399 goto out; 400 } 401 402 out: 403 kfree_skb(skb); 404 return 0; 405 } 406 407 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 408 { 409 struct sock *sk = ub->sk; 410 struct ip_mreqn mreqn; 411 int err = 0; 412 413 if (ntohs(remote->proto) == ETH_P_IP) { 414 mreqn.imr_multiaddr = remote->ipv4; 415 mreqn.imr_ifindex = ub->ifindex; 416 err = ip_mc_join_group(sk, &mreqn); 417 #if IS_ENABLED(CONFIG_IPV6) 418 } else { 419 lock_sock(sk); 420 err = ipv6_sock_mc_join(sk, ub->ifindex, &remote->ipv6); 421 release_sock(sk); 422 #endif 423 } 424 return err; 425 } 426 427 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 428 struct udp_media_addr *addr, int nla_t) 429 { 430 if (ntohs(addr->proto) == ETH_P_IP) { 431 struct sockaddr_in ip4; 432 433 memset(&ip4, 0, sizeof(ip4)); 434 ip4.sin_family = AF_INET; 435 ip4.sin_port = addr->port; 436 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 437 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 438 return -EMSGSIZE; 439 440 #if IS_ENABLED(CONFIG_IPV6) 441 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 442 struct sockaddr_in6 ip6; 443 444 memset(&ip6, 0, sizeof(ip6)); 445 ip6.sin6_family = AF_INET6; 446 ip6.sin6_port = addr->port; 447 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 448 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 449 return -EMSGSIZE; 450 #endif 451 } 452 453 return 0; 454 } 455 456 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 457 { 458 u32 bid = cb->args[0]; 459 u32 skip_cnt = cb->args[1]; 460 u32 portid = NETLINK_CB(cb->skb).portid; 461 struct udp_replicast *rcast, *tmp; 462 struct tipc_bearer *b; 463 struct udp_bearer *ub; 464 void *hdr; 465 int err; 466 int i; 467 468 if (!bid && !skip_cnt) { 469 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs; 470 struct net *net = sock_net(skb->sk); 471 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 472 char *bname; 473 474 if (!attrs[TIPC_NLA_BEARER]) 475 return -EINVAL; 476 477 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, 478 attrs[TIPC_NLA_BEARER], 479 tipc_nl_bearer_policy, NULL); 480 if (err) 481 return err; 482 483 if (!battrs[TIPC_NLA_BEARER_NAME]) 484 return -EINVAL; 485 486 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 487 488 rtnl_lock(); 489 b = tipc_bearer_find(net, bname); 490 if (!b || b->bcast_addr.media_id != TIPC_MEDIA_TYPE_UDP) { 491 rtnl_unlock(); 492 return -EINVAL; 493 } 494 bid = b->identity; 495 } else { 496 struct net *net = sock_net(skb->sk); 497 struct tipc_net *tn = net_generic(net, tipc_net_id); 498 499 rtnl_lock(); 500 b = rtnl_dereference(tn->bearer_list[bid]); 501 if (!b || b->bcast_addr.media_id != TIPC_MEDIA_TYPE_UDP) { 502 rtnl_unlock(); 503 return -EINVAL; 504 } 505 } 506 507 ub = rtnl_dereference(b->media_ptr); 508 if (!ub) { 509 rtnl_unlock(); 510 return -EINVAL; 511 } 512 513 i = 0; 514 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 515 if (i < skip_cnt) 516 goto count; 517 518 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 519 &tipc_genl_family, NLM_F_MULTI, 520 TIPC_NL_BEARER_GET); 521 if (!hdr) 522 goto done; 523 524 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 525 TIPC_NLA_UDP_REMOTE); 526 if (err) { 527 genlmsg_cancel(skb, hdr); 528 goto done; 529 } 530 genlmsg_end(skb, hdr); 531 count: 532 i++; 533 } 534 done: 535 rtnl_unlock(); 536 cb->args[0] = bid; 537 cb->args[1] = i; 538 539 return skb->len; 540 } 541 542 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 543 { 544 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 545 struct udp_media_addr *dst; 546 struct udp_bearer *ub; 547 struct nlattr *nest; 548 549 ub = rtnl_dereference(b->media_ptr); 550 if (!ub) 551 return -ENODEV; 552 553 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 554 if (!nest) 555 goto msg_full; 556 557 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 558 goto msg_full; 559 560 dst = (struct udp_media_addr *)&b->bcast_addr.value; 561 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 562 goto msg_full; 563 564 if (!list_empty(&ub->rcast.list)) { 565 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 566 goto msg_full; 567 } 568 569 nla_nest_end(msg->skb, nest); 570 return 0; 571 msg_full: 572 nla_nest_cancel(msg->skb, nest); 573 return -EMSGSIZE; 574 } 575 576 /** 577 * tipc_parse_udp_addr - build udp media address from netlink data 578 * @nla: netlink attribute containing sockaddr storage aligned address 579 * @addr: tipc media address to fill with address, port and protocol type 580 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 581 */ 582 583 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 584 u32 *scope_id) 585 { 586 struct sockaddr_storage sa; 587 588 nla_memcpy(&sa, nla, sizeof(sa)); 589 if (sa.ss_family == AF_INET) { 590 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 591 592 addr->proto = htons(ETH_P_IP); 593 addr->port = ip4->sin_port; 594 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 595 return 0; 596 597 #if IS_ENABLED(CONFIG_IPV6) 598 } else if (sa.ss_family == AF_INET6) { 599 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 600 601 addr->proto = htons(ETH_P_IPV6); 602 addr->port = ip6->sin6_port; 603 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 604 605 /* Scope ID is only interesting for local addresses */ 606 if (scope_id) { 607 int atype; 608 609 atype = ipv6_addr_type(&ip6->sin6_addr); 610 if (__ipv6_addr_needs_scope_id(atype) && 611 !ip6->sin6_scope_id) { 612 return -EINVAL; 613 } 614 615 *scope_id = ip6->sin6_scope_id ? : 0; 616 } 617 618 return 0; 619 #endif 620 } 621 return -EADDRNOTAVAIL; 622 } 623 624 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 625 { 626 int err; 627 struct udp_media_addr addr = {0}; 628 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 629 struct udp_media_addr *dst; 630 631 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL)) 632 return -EINVAL; 633 634 if (!opts[TIPC_NLA_UDP_REMOTE]) 635 return -EINVAL; 636 637 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 638 if (err) 639 return err; 640 641 dst = (struct udp_media_addr *)&b->bcast_addr.value; 642 if (tipc_udp_is_mcast_addr(dst)) { 643 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 644 return -EINVAL; 645 } 646 647 if (tipc_udp_is_known_peer(b, &addr)) 648 return 0; 649 650 return tipc_udp_rcast_add(b, &addr); 651 } 652 653 /** 654 * tipc_udp_enable - callback to create a new udp bearer instance 655 * @net: network namespace 656 * @b: pointer to generic tipc_bearer 657 * @attrs: netlink bearer configuration 658 * 659 * validate the bearer parameters and initialize the udp bearer 660 * rtnl_lock should be held 661 */ 662 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 663 struct nlattr *attrs[]) 664 { 665 int err = -EINVAL; 666 struct udp_bearer *ub; 667 struct udp_media_addr remote = {0}; 668 struct udp_media_addr local = {0}; 669 struct udp_port_cfg udp_conf = {0}; 670 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 671 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 672 u8 node_id[NODE_ID_LEN] = {0,}; 673 struct net_device *dev; 674 struct socket *sock; 675 int rmcast = 0; 676 677 ub = kzalloc_obj(*ub, GFP_ATOMIC); 678 if (!ub) 679 return -ENOMEM; 680 681 INIT_LIST_HEAD(&ub->rcast.list); 682 683 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 684 goto err; 685 686 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 687 goto err; 688 689 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 690 pr_err("Invalid UDP bearer configuration"); 691 err = -EINVAL; 692 goto err; 693 } 694 695 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 696 &ub->ifindex); 697 if (err) 698 goto err; 699 700 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 701 if (err) 702 goto err; 703 704 if (remote.proto != local.proto) { 705 err = -EINVAL; 706 goto err; 707 } 708 709 /* Checking remote ip address */ 710 rmcast = tipc_udp_is_mcast_addr(&remote); 711 712 /* Autoconfigure own node identity if needed */ 713 if (!tipc_own_id(net)) { 714 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 715 tipc_net_init(net, node_id, 0); 716 } 717 if (!tipc_own_id(net)) { 718 pr_warn("Failed to set node id, please configure manually\n"); 719 err = -EINVAL; 720 goto err; 721 } 722 723 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 724 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 725 rcu_assign_pointer(b->media_ptr, ub); 726 rcu_assign_pointer(ub->bearer, b); 727 tipc_udp_media_addr_set(&b->addr, &local); 728 if (local.proto == htons(ETH_P_IP)) { 729 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 730 if (!dev) { 731 err = -ENODEV; 732 goto err; 733 } 734 udp_conf.family = AF_INET; 735 736 /* Switch to use ANY to receive packets from group */ 737 if (rmcast) 738 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 739 else 740 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 741 udp_conf.use_udp_checksums = false; 742 ub->ifindex = dev->ifindex; 743 b->encap_hlen = sizeof(struct iphdr) + sizeof(struct udphdr); 744 b->mtu = b->media->mtu; 745 #if IS_ENABLED(CONFIG_IPV6) 746 } else if (local.proto == htons(ETH_P_IPV6)) { 747 dev = ub->ifindex ? __dev_get_by_index(net, ub->ifindex) : NULL; 748 dev = ipv6_dev_find(net, &local.ipv6, dev); 749 if (!dev) { 750 err = -ENODEV; 751 goto err; 752 } 753 udp_conf.family = AF_INET6; 754 udp_conf.use_udp6_tx_checksums = true; 755 udp_conf.use_udp6_rx_checksums = true; 756 if (rmcast) 757 udp_conf.local_ip6 = in6addr_any; 758 else 759 udp_conf.local_ip6 = local.ipv6; 760 ub->ifindex = dev->ifindex; 761 b->encap_hlen = sizeof(struct ipv6hdr) + sizeof(struct udphdr); 762 b->mtu = 1280; 763 #endif 764 } else { 765 err = -EAFNOSUPPORT; 766 goto err; 767 } 768 udp_conf.local_udp_port = local.port; 769 err = udp_sock_create(net, &udp_conf, &sock); 770 if (err) 771 goto err; 772 773 ub->sk = sock->sk; 774 tuncfg.sk_user_data = ub; 775 tuncfg.encap_type = 1; 776 tuncfg.encap_rcv = tipc_udp_recv; 777 tuncfg.encap_destroy = NULL; 778 setup_udp_tunnel_sock(net, ub->sk, &tuncfg); 779 780 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); 781 if (err) 782 goto free; 783 784 /* 785 * The bcast media address port is used for all peers and the ip 786 * is used if it's a multicast address. 787 */ 788 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 789 if (rmcast) 790 err = enable_mcast(ub, &remote); 791 else 792 err = tipc_udp_rcast_add(b, &remote); 793 if (err) 794 goto free; 795 796 return 0; 797 798 free: 799 dst_cache_destroy(&ub->rcast.dst_cache); 800 udp_tunnel_sock_release(ub->sk); 801 synchronize_rcu(); 802 err: 803 kfree(ub); 804 return err; 805 } 806 807 static void rcast_free_rcu(struct rcu_head *rcu) 808 { 809 struct udp_replicast *rcast = container_of(rcu, struct udp_replicast, rcu); 810 811 dst_cache_destroy(&rcast->dst_cache); 812 kfree(rcast); 813 } 814 815 /* cleanup_bearer - break the socket/bearer association */ 816 static void cleanup_bearer(struct work_struct *work) 817 { 818 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 819 struct udp_replicast *rcast, *tmp; 820 struct tipc_net *tn; 821 822 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 823 list_del_rcu(&rcast->list); 824 call_rcu_hurry(&rcast->rcu, rcast_free_rcu); 825 } 826 827 tn = tipc_net(sock_net(ub->sk)); 828 829 udp_tunnel_sock_release(ub->sk); 830 831 synchronize_net(); 832 833 dst_cache_destroy(&ub->rcast.dst_cache); 834 if (atomic_dec_and_test(&tn->wq_count)) 835 wake_up_var(&tn->wq_count); 836 kfree(ub); 837 } 838 839 /* tipc_udp_disable - detach bearer from socket */ 840 static void tipc_udp_disable(struct tipc_bearer *b) 841 { 842 struct udp_bearer *ub; 843 844 ub = rtnl_dereference(b->media_ptr); 845 if (!ub) { 846 pr_err("UDP bearer instance not found\n"); 847 return; 848 } 849 sock_set_flag(ub->sk, SOCK_DEAD); 850 RCU_INIT_POINTER(ub->bearer, NULL); 851 852 /* sock_release need to be done outside of rtnl lock */ 853 atomic_inc(&tipc_net(sock_net(ub->sk))->wq_count); 854 INIT_WORK(&ub->work, cleanup_bearer); 855 schedule_work(&ub->work); 856 } 857 858 struct tipc_media udp_media_info = { 859 .send_msg = tipc_udp_send_msg, 860 .enable_media = tipc_udp_enable, 861 .disable_media = tipc_udp_disable, 862 .addr2str = tipc_udp_addr2str, 863 .addr2msg = tipc_udp_addr2msg, 864 .msg2addr = tipc_udp_msg2addr, 865 .priority = TIPC_DEF_LINK_PRI, 866 .tolerance = TIPC_DEF_LINK_TOL, 867 .min_win = TIPC_DEF_LINK_WIN, 868 .max_win = TIPC_DEF_LINK_WIN, 869 .mtu = TIPC_DEF_LINK_UDP_MTU, 870 .type_id = TIPC_MEDIA_TYPE_UDP, 871 .hwaddr_len = 0, 872 .name = "udp" 873 }; 874