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