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 <linux/tipc_netlink.h> 48 #include "core.h" 49 #include "addr.h" 50 #include "net.h" 51 #include "bearer.h" 52 #include "netlink.h" 53 #include "msg.h" 54 #include "udp_media.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 * @proto: Ethernet protocol in use 68 * @port: port being used 69 * @ipv4: IPv4 address of neighbor 70 * @ipv6: IPv6 address of neighbor 71 */ 72 struct udp_media_addr { 73 __be16 proto; 74 __be16 port; 75 union { 76 struct in_addr ipv4; 77 struct in6_addr ipv6; 78 }; 79 }; 80 81 /* struct udp_replicast - container for UDP remote addresses */ 82 struct udp_replicast { 83 struct udp_media_addr addr; 84 struct dst_cache dst_cache; 85 struct rcu_head rcu; 86 struct list_head list; 87 }; 88 89 /** 90 * struct udp_bearer - ip/udp bearer data structure 91 * @bearer: associated generic tipc bearer 92 * @ubsock: bearer associated socket 93 * @ifindex: local address scope 94 * @work: used to schedule deferred work on a bearer 95 * @rcast: associated udp_replicast container 96 */ 97 struct udp_bearer { 98 struct tipc_bearer __rcu *bearer; 99 struct socket *ubsock; 100 u32 ifindex; 101 struct work_struct work; 102 struct udp_replicast rcast; 103 }; 104 105 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr) 106 { 107 if (ntohs(addr->proto) == ETH_P_IP) 108 return ipv4_is_multicast(addr->ipv4.s_addr); 109 #if IS_ENABLED(CONFIG_IPV6) 110 else 111 return ipv6_addr_is_multicast(&addr->ipv6); 112 #endif 113 return 0; 114 } 115 116 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ 117 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, 118 struct udp_media_addr *ua) 119 { 120 memset(addr, 0, sizeof(struct tipc_media_addr)); 121 addr->media_id = TIPC_MEDIA_TYPE_UDP; 122 memcpy(addr->value, ua, sizeof(struct udp_media_addr)); 123 124 if (tipc_udp_is_mcast_addr(ua)) 125 addr->broadcast = TIPC_BROADCAST_SUPPORT; 126 } 127 128 /* tipc_udp_addr2str - convert ip/udp address to string */ 129 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) 130 { 131 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; 132 133 if (ntohs(ua->proto) == ETH_P_IP) 134 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port)); 135 else if (ntohs(ua->proto) == ETH_P_IPV6) 136 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port)); 137 else { 138 pr_err("Invalid UDP media address\n"); 139 return 1; 140 } 141 142 return 0; 143 } 144 145 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ 146 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, 147 char *msg) 148 { 149 struct udp_media_addr *ua; 150 151 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); 152 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) 153 return -EINVAL; 154 tipc_udp_media_addr_set(a, ua); 155 return 0; 156 } 157 158 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ 159 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) 160 { 161 memset(msg, 0, TIPC_MEDIA_INFO_SIZE); 162 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; 163 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, 164 sizeof(struct udp_media_addr)); 165 return 0; 166 } 167 168 /* tipc_send_msg - enqueue a send request */ 169 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, 170 struct udp_bearer *ub, struct udp_media_addr *src, 171 struct udp_media_addr *dst, struct dst_cache *cache) 172 { 173 struct dst_entry *ndst; 174 int ttl, err; 175 176 local_bh_disable(); 177 ndst = dst_cache_get(cache); 178 if (dst->proto == htons(ETH_P_IP)) { 179 struct rtable *rt = dst_rtable(ndst); 180 181 if (!rt) { 182 struct flowi4 fl = { 183 .daddr = dst->ipv4.s_addr, 184 .saddr = src->ipv4.s_addr, 185 .flowi4_mark = skb->mark, 186 .flowi4_proto = IPPROTO_UDP 187 }; 188 rt = ip_route_output_key(net, &fl); 189 if (IS_ERR(rt)) { 190 err = PTR_ERR(rt); 191 goto tx_error; 192 } 193 dst_cache_set_ip4(cache, &rt->dst, fl.saddr); 194 } 195 196 ttl = ip4_dst_hoplimit(&rt->dst); 197 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, 198 dst->ipv4.s_addr, 0, ttl, 0, src->port, 199 dst->port, false, true, 0); 200 #if IS_ENABLED(CONFIG_IPV6) 201 } else { 202 if (!ndst) { 203 struct flowi6 fl6 = { 204 .flowi6_oif = ub->ifindex, 205 .daddr = dst->ipv6, 206 .saddr = src->ipv6, 207 .flowi6_proto = IPPROTO_UDP 208 }; 209 ndst = ip6_dst_lookup_flow(net, ub->ubsock->sk, 210 &fl6, NULL); 211 if (IS_ERR(ndst)) { 212 err = PTR_ERR(ndst); 213 goto tx_error; 214 } 215 dst_cache_set_ip6(cache, ndst, &fl6.saddr); 216 } 217 ttl = ip6_dst_hoplimit(ndst); 218 udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL, 219 &src->ipv6, &dst->ipv6, 0, ttl, 0, 220 src->port, dst->port, false, 0); 221 #endif 222 } 223 local_bh_enable(); 224 return 0; 225 226 tx_error: 227 local_bh_enable(); 228 kfree_skb(skb); 229 return err; 230 } 231 232 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 233 struct tipc_bearer *b, 234 struct tipc_media_addr *addr) 235 { 236 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 237 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; 238 struct udp_replicast *rcast; 239 struct udp_bearer *ub; 240 int err = 0; 241 242 if (skb_headroom(skb) < UDP_MIN_HEADROOM) { 243 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); 244 if (err) 245 goto out; 246 } 247 248 skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); 249 ub = rcu_dereference(b->media_ptr); 250 if (!ub) { 251 err = -ENODEV; 252 goto out; 253 } 254 255 if (addr->broadcast != TIPC_REPLICAST_SUPPORT) 256 return tipc_udp_xmit(net, skb, ub, src, dst, 257 &ub->rcast.dst_cache); 258 259 /* Replicast, send an skb to each configured IP address */ 260 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { 261 struct sk_buff *_skb; 262 263 _skb = pskb_copy(skb, GFP_ATOMIC); 264 if (!_skb) { 265 err = -ENOMEM; 266 goto out; 267 } 268 269 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr, 270 &rcast->dst_cache); 271 if (err) 272 goto out; 273 } 274 err = 0; 275 out: 276 kfree_skb(skb); 277 return err; 278 } 279 280 static bool tipc_udp_is_known_peer(struct tipc_bearer *b, 281 struct udp_media_addr *addr) 282 { 283 struct udp_replicast *rcast, *tmp; 284 struct udp_bearer *ub; 285 286 ub = rcu_dereference_rtnl(b->media_ptr); 287 if (!ub) { 288 pr_err_ratelimited("UDP bearer instance not found\n"); 289 return false; 290 } 291 292 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 293 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) 294 return true; 295 } 296 297 return false; 298 } 299 300 static int tipc_udp_rcast_add(struct tipc_bearer *b, 301 struct udp_media_addr *addr) 302 { 303 struct udp_replicast *rcast; 304 struct udp_bearer *ub; 305 306 ub = rcu_dereference_rtnl(b->media_ptr); 307 if (!ub) 308 return -ENODEV; 309 310 rcast = kmalloc_obj(*rcast, GFP_ATOMIC); 311 if (!rcast) 312 return -ENOMEM; 313 314 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) { 315 kfree(rcast); 316 return -ENOMEM; 317 } 318 319 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); 320 321 if (ntohs(addr->proto) == ETH_P_IP) 322 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); 323 #if IS_ENABLED(CONFIG_IPV6) 324 else if (ntohs(addr->proto) == ETH_P_IPV6) 325 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); 326 #endif 327 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 328 list_add_rcu(&rcast->list, &ub->rcast.list); 329 return 0; 330 } 331 332 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) 333 { 334 struct udp_media_addr src = {0}; 335 struct udp_media_addr *dst; 336 337 dst = (struct udp_media_addr *)&b->bcast_addr.value; 338 if (tipc_udp_is_mcast_addr(dst)) 339 return 0; 340 341 src.port = udp_hdr(skb)->source; 342 343 if (ip_hdr(skb)->version == 4) { 344 struct iphdr *iphdr = ip_hdr(skb); 345 346 src.proto = htons(ETH_P_IP); 347 src.ipv4.s_addr = iphdr->saddr; 348 if (ipv4_is_multicast(iphdr->daddr)) 349 return 0; 350 #if IS_ENABLED(CONFIG_IPV6) 351 } else if (ip_hdr(skb)->version == 6) { 352 struct ipv6hdr *iphdr = ipv6_hdr(skb); 353 354 src.proto = htons(ETH_P_IPV6); 355 src.ipv6 = iphdr->saddr; 356 if (ipv6_addr_is_multicast(&iphdr->daddr)) 357 return 0; 358 #endif 359 } else { 360 return 0; 361 } 362 363 if (likely(tipc_udp_is_known_peer(b, &src))) 364 return 0; 365 366 return tipc_udp_rcast_add(b, &src); 367 } 368 369 /* tipc_udp_recv - read data from bearer socket */ 370 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) 371 { 372 struct udp_bearer *ub; 373 struct tipc_bearer *b; 374 struct tipc_msg *hdr; 375 int err; 376 377 ub = rcu_dereference_sk_user_data(sk); 378 if (!ub) { 379 pr_err_ratelimited("Failed to get UDP bearer reference"); 380 goto out; 381 } 382 skb_pull(skb, sizeof(struct udphdr)); 383 hdr = buf_msg(skb); 384 385 b = rcu_dereference(ub->bearer); 386 if (!b) 387 goto out; 388 389 if (b && test_bit(0, &b->up)) { 390 TIPC_SKB_CB(skb)->flags = 0; 391 tipc_rcv(sock_net(sk), skb, b); 392 return 0; 393 } 394 395 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 396 err = tipc_udp_rcast_disc(b, skb); 397 if (err) 398 goto out; 399 } 400 401 out: 402 kfree_skb(skb); 403 return 0; 404 } 405 406 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 407 { 408 int err = 0; 409 struct ip_mreqn mreqn; 410 struct sock *sk = ub->ubsock->sk; 411 412 if (ntohs(remote->proto) == ETH_P_IP) { 413 mreqn.imr_multiaddr = remote->ipv4; 414 mreqn.imr_ifindex = ub->ifindex; 415 err = ip_mc_join_group(sk, &mreqn); 416 #if IS_ENABLED(CONFIG_IPV6) 417 } else { 418 lock_sock(sk); 419 err = ipv6_sock_mc_join(sk, ub->ifindex, &remote->ipv6); 420 release_sock(sk); 421 #endif 422 } 423 return err; 424 } 425 426 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 427 struct udp_media_addr *addr, int nla_t) 428 { 429 if (ntohs(addr->proto) == ETH_P_IP) { 430 struct sockaddr_in ip4; 431 432 memset(&ip4, 0, sizeof(ip4)); 433 ip4.sin_family = AF_INET; 434 ip4.sin_port = addr->port; 435 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 436 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 437 return -EMSGSIZE; 438 439 #if IS_ENABLED(CONFIG_IPV6) 440 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 441 struct sockaddr_in6 ip6; 442 443 memset(&ip6, 0, sizeof(ip6)); 444 ip6.sin6_family = AF_INET6; 445 ip6.sin6_port = addr->port; 446 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 447 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 448 return -EMSGSIZE; 449 #endif 450 } 451 452 return 0; 453 } 454 455 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 456 { 457 u32 bid = cb->args[0]; 458 u32 skip_cnt = cb->args[1]; 459 u32 portid = NETLINK_CB(cb->skb).portid; 460 struct udp_replicast *rcast, *tmp; 461 struct tipc_bearer *b; 462 struct udp_bearer *ub; 463 void *hdr; 464 int err; 465 int i; 466 467 if (!bid && !skip_cnt) { 468 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs; 469 struct net *net = sock_net(skb->sk); 470 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 471 char *bname; 472 473 if (!attrs[TIPC_NLA_BEARER]) 474 return -EINVAL; 475 476 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, 477 attrs[TIPC_NLA_BEARER], 478 tipc_nl_bearer_policy, NULL); 479 if (err) 480 return err; 481 482 if (!battrs[TIPC_NLA_BEARER_NAME]) 483 return -EINVAL; 484 485 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 486 487 rtnl_lock(); 488 b = tipc_bearer_find(net, bname); 489 if (!b || b->bcast_addr.media_id != TIPC_MEDIA_TYPE_UDP) { 490 rtnl_unlock(); 491 return -EINVAL; 492 } 493 bid = b->identity; 494 } else { 495 struct net *net = sock_net(skb->sk); 496 struct tipc_net *tn = net_generic(net, tipc_net_id); 497 498 rtnl_lock(); 499 b = rtnl_dereference(tn->bearer_list[bid]); 500 if (!b || b->bcast_addr.media_id != TIPC_MEDIA_TYPE_UDP) { 501 rtnl_unlock(); 502 return -EINVAL; 503 } 504 } 505 506 ub = rtnl_dereference(b->media_ptr); 507 if (!ub) { 508 rtnl_unlock(); 509 return -EINVAL; 510 } 511 512 i = 0; 513 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 514 if (i < skip_cnt) 515 goto count; 516 517 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 518 &tipc_genl_family, NLM_F_MULTI, 519 TIPC_NL_BEARER_GET); 520 if (!hdr) 521 goto done; 522 523 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 524 TIPC_NLA_UDP_REMOTE); 525 if (err) { 526 genlmsg_cancel(skb, hdr); 527 goto done; 528 } 529 genlmsg_end(skb, hdr); 530 count: 531 i++; 532 } 533 done: 534 rtnl_unlock(); 535 cb->args[0] = bid; 536 cb->args[1] = i; 537 538 return skb->len; 539 } 540 541 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 542 { 543 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 544 struct udp_media_addr *dst; 545 struct udp_bearer *ub; 546 struct nlattr *nest; 547 548 ub = rtnl_dereference(b->media_ptr); 549 if (!ub) 550 return -ENODEV; 551 552 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 553 if (!nest) 554 goto msg_full; 555 556 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 557 goto msg_full; 558 559 dst = (struct udp_media_addr *)&b->bcast_addr.value; 560 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 561 goto msg_full; 562 563 if (!list_empty(&ub->rcast.list)) { 564 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 565 goto msg_full; 566 } 567 568 nla_nest_end(msg->skb, nest); 569 return 0; 570 msg_full: 571 nla_nest_cancel(msg->skb, nest); 572 return -EMSGSIZE; 573 } 574 575 /** 576 * tipc_parse_udp_addr - build udp media address from netlink data 577 * @nla: netlink attribute containing sockaddr storage aligned address 578 * @addr: tipc media address to fill with address, port and protocol type 579 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 580 */ 581 582 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 583 u32 *scope_id) 584 { 585 struct sockaddr_storage sa; 586 587 nla_memcpy(&sa, nla, sizeof(sa)); 588 if (sa.ss_family == AF_INET) { 589 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 590 591 addr->proto = htons(ETH_P_IP); 592 addr->port = ip4->sin_port; 593 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 594 return 0; 595 596 #if IS_ENABLED(CONFIG_IPV6) 597 } else if (sa.ss_family == AF_INET6) { 598 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 599 600 addr->proto = htons(ETH_P_IPV6); 601 addr->port = ip6->sin6_port; 602 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 603 604 /* Scope ID is only interesting for local addresses */ 605 if (scope_id) { 606 int atype; 607 608 atype = ipv6_addr_type(&ip6->sin6_addr); 609 if (__ipv6_addr_needs_scope_id(atype) && 610 !ip6->sin6_scope_id) { 611 return -EINVAL; 612 } 613 614 *scope_id = ip6->sin6_scope_id ? : 0; 615 } 616 617 return 0; 618 #endif 619 } 620 return -EADDRNOTAVAIL; 621 } 622 623 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 624 { 625 int err; 626 struct udp_media_addr addr = {0}; 627 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 628 struct udp_media_addr *dst; 629 630 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL)) 631 return -EINVAL; 632 633 if (!opts[TIPC_NLA_UDP_REMOTE]) 634 return -EINVAL; 635 636 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 637 if (err) 638 return err; 639 640 dst = (struct udp_media_addr *)&b->bcast_addr.value; 641 if (tipc_udp_is_mcast_addr(dst)) { 642 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 643 return -EINVAL; 644 } 645 646 if (tipc_udp_is_known_peer(b, &addr)) 647 return 0; 648 649 return tipc_udp_rcast_add(b, &addr); 650 } 651 652 /** 653 * tipc_udp_enable - callback to create a new udp bearer instance 654 * @net: network namespace 655 * @b: pointer to generic tipc_bearer 656 * @attrs: netlink bearer configuration 657 * 658 * validate the bearer parameters and initialize the udp bearer 659 * rtnl_lock should be held 660 */ 661 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 662 struct nlattr *attrs[]) 663 { 664 int err = -EINVAL; 665 struct udp_bearer *ub; 666 struct udp_media_addr remote = {0}; 667 struct udp_media_addr local = {0}; 668 struct udp_port_cfg udp_conf = {0}; 669 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 670 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 671 u8 node_id[NODE_ID_LEN] = {0,}; 672 struct net_device *dev; 673 int rmcast = 0; 674 675 ub = kzalloc_obj(*ub, GFP_ATOMIC); 676 if (!ub) 677 return -ENOMEM; 678 679 INIT_LIST_HEAD(&ub->rcast.list); 680 681 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 682 goto err; 683 684 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 685 goto err; 686 687 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 688 pr_err("Invalid UDP bearer configuration"); 689 err = -EINVAL; 690 goto err; 691 } 692 693 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 694 &ub->ifindex); 695 if (err) 696 goto err; 697 698 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 699 if (err) 700 goto err; 701 702 if (remote.proto != local.proto) { 703 err = -EINVAL; 704 goto err; 705 } 706 707 /* Checking remote ip address */ 708 rmcast = tipc_udp_is_mcast_addr(&remote); 709 710 /* Autoconfigure own node identity if needed */ 711 if (!tipc_own_id(net)) { 712 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 713 tipc_net_init(net, node_id, 0); 714 } 715 if (!tipc_own_id(net)) { 716 pr_warn("Failed to set node id, please configure manually\n"); 717 err = -EINVAL; 718 goto err; 719 } 720 721 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 722 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 723 rcu_assign_pointer(b->media_ptr, ub); 724 rcu_assign_pointer(ub->bearer, b); 725 tipc_udp_media_addr_set(&b->addr, &local); 726 if (local.proto == htons(ETH_P_IP)) { 727 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 728 if (!dev) { 729 err = -ENODEV; 730 goto err; 731 } 732 udp_conf.family = AF_INET; 733 734 /* Switch to use ANY to receive packets from group */ 735 if (rmcast) 736 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 737 else 738 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 739 udp_conf.use_udp_checksums = false; 740 ub->ifindex = dev->ifindex; 741 b->encap_hlen = sizeof(struct iphdr) + sizeof(struct udphdr); 742 b->mtu = b->media->mtu; 743 #if IS_ENABLED(CONFIG_IPV6) 744 } else if (local.proto == htons(ETH_P_IPV6)) { 745 dev = ub->ifindex ? __dev_get_by_index(net, ub->ifindex) : NULL; 746 dev = ipv6_dev_find(net, &local.ipv6, dev); 747 if (!dev) { 748 err = -ENODEV; 749 goto err; 750 } 751 udp_conf.family = AF_INET6; 752 udp_conf.use_udp6_tx_checksums = true; 753 udp_conf.use_udp6_rx_checksums = true; 754 if (rmcast) 755 udp_conf.local_ip6 = in6addr_any; 756 else 757 udp_conf.local_ip6 = local.ipv6; 758 ub->ifindex = dev->ifindex; 759 b->encap_hlen = sizeof(struct ipv6hdr) + sizeof(struct udphdr); 760 b->mtu = 1280; 761 #endif 762 } else { 763 err = -EAFNOSUPPORT; 764 goto err; 765 } 766 udp_conf.local_udp_port = local.port; 767 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 768 if (err) 769 goto err; 770 tuncfg.sk_user_data = ub; 771 tuncfg.encap_type = 1; 772 tuncfg.encap_rcv = tipc_udp_recv; 773 tuncfg.encap_destroy = NULL; 774 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 775 776 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); 777 if (err) 778 goto free; 779 780 /* 781 * The bcast media address port is used for all peers and the ip 782 * is used if it's a multicast address. 783 */ 784 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 785 if (rmcast) 786 err = enable_mcast(ub, &remote); 787 else 788 err = tipc_udp_rcast_add(b, &remote); 789 if (err) 790 goto free; 791 792 return 0; 793 794 free: 795 dst_cache_destroy(&ub->rcast.dst_cache); 796 udp_tunnel_sock_release(ub->ubsock); 797 err: 798 kfree(ub); 799 return err; 800 } 801 802 /* cleanup_bearer - break the socket/bearer association */ 803 static void cleanup_bearer(struct work_struct *work) 804 { 805 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 806 struct udp_replicast *rcast, *tmp; 807 struct tipc_net *tn; 808 809 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 810 dst_cache_destroy(&rcast->dst_cache); 811 list_del_rcu(&rcast->list); 812 kfree_rcu(rcast, rcu); 813 } 814 815 tn = tipc_net(sock_net(ub->ubsock->sk)); 816 817 dst_cache_destroy(&ub->rcast.dst_cache); 818 udp_tunnel_sock_release(ub->ubsock); 819 820 /* Note: could use a call_rcu() to avoid another synchronize_net() */ 821 synchronize_net(); 822 atomic_dec(&tn->wq_count); 823 kfree(ub); 824 } 825 826 /* tipc_udp_disable - detach bearer from socket */ 827 static void tipc_udp_disable(struct tipc_bearer *b) 828 { 829 struct udp_bearer *ub; 830 831 ub = rtnl_dereference(b->media_ptr); 832 if (!ub) { 833 pr_err("UDP bearer instance not found\n"); 834 return; 835 } 836 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 837 RCU_INIT_POINTER(ub->bearer, NULL); 838 839 /* sock_release need to be done outside of rtnl lock */ 840 atomic_inc(&tipc_net(sock_net(ub->ubsock->sk))->wq_count); 841 INIT_WORK(&ub->work, cleanup_bearer); 842 schedule_work(&ub->work); 843 } 844 845 struct tipc_media udp_media_info = { 846 .send_msg = tipc_udp_send_msg, 847 .enable_media = tipc_udp_enable, 848 .disable_media = tipc_udp_disable, 849 .addr2str = tipc_udp_addr2str, 850 .addr2msg = tipc_udp_addr2msg, 851 .msg2addr = tipc_udp_msg2addr, 852 .priority = TIPC_DEF_LINK_PRI, 853 .tolerance = TIPC_DEF_LINK_TOL, 854 .min_win = TIPC_DEF_LINK_WIN, 855 .max_win = TIPC_DEF_LINK_WIN, 856 .mtu = TIPC_DEF_LINK_UDP_MTU, 857 .type_id = TIPC_MEDIA_TYPE_UDP, 858 .hwaddr_len = 0, 859 .name = "udp" 860 }; 861