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 #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 * @ubsock: 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 socket *ubsock; 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 0; 141 } 142 143 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ 144 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, 145 char *msg) 146 { 147 struct udp_media_addr *ua; 148 149 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); 150 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) 151 return -EINVAL; 152 tipc_udp_media_addr_set(a, ua); 153 return 0; 154 } 155 156 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ 157 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) 158 { 159 memset(msg, 0, TIPC_MEDIA_INFO_SIZE); 160 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; 161 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, 162 sizeof(struct udp_media_addr)); 163 return 0; 164 } 165 166 /* tipc_send_msg - enqueue a send request */ 167 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, 168 struct udp_bearer *ub, struct udp_media_addr *src, 169 struct udp_media_addr *dst, struct dst_cache *cache) 170 { 171 struct dst_entry *ndst; 172 int ttl, err = 0; 173 174 local_bh_disable(); 175 ndst = dst_cache_get(cache); 176 if (dst->proto == htons(ETH_P_IP)) { 177 struct rtable *rt = (struct rtable *)ndst; 178 179 if (!rt) { 180 struct flowi4 fl = { 181 .daddr = dst->ipv4.s_addr, 182 .saddr = src->ipv4.s_addr, 183 .flowi4_mark = skb->mark, 184 .flowi4_proto = IPPROTO_UDP 185 }; 186 rt = ip_route_output_key(net, &fl); 187 if (IS_ERR(rt)) { 188 err = PTR_ERR(rt); 189 goto tx_error; 190 } 191 dst_cache_set_ip4(cache, &rt->dst, fl.saddr); 192 } 193 194 ttl = ip4_dst_hoplimit(&rt->dst); 195 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, 196 dst->ipv4.s_addr, 0, ttl, 0, src->port, 197 dst->port, false, true); 198 #if IS_ENABLED(CONFIG_IPV6) 199 } else { 200 if (!ndst) { 201 struct flowi6 fl6 = { 202 .flowi6_oif = ub->ifindex, 203 .daddr = dst->ipv6, 204 .saddr = src->ipv6, 205 .flowi6_proto = IPPROTO_UDP 206 }; 207 ndst = ipv6_stub->ipv6_dst_lookup_flow(net, 208 ub->ubsock->sk, 209 &fl6, NULL); 210 if (IS_ERR(ndst)) { 211 err = PTR_ERR(ndst); 212 goto tx_error; 213 } 214 dst_cache_set_ip6(cache, ndst, &fl6.saddr); 215 } 216 ttl = ip6_dst_hoplimit(ndst); 217 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL, 218 &src->ipv6, &dst->ipv6, 0, ttl, 0, 219 src->port, dst->port, false); 220 #endif 221 } 222 local_bh_enable(); 223 return err; 224 225 tx_error: 226 local_bh_enable(); 227 kfree_skb(skb); 228 return err; 229 } 230 231 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 232 struct tipc_bearer *b, 233 struct tipc_media_addr *addr) 234 { 235 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 236 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; 237 struct udp_replicast *rcast; 238 struct udp_bearer *ub; 239 int err = 0; 240 241 if (skb_headroom(skb) < UDP_MIN_HEADROOM) { 242 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); 243 if (err) 244 goto out; 245 } 246 247 skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); 248 ub = rcu_dereference(b->media_ptr); 249 if (!ub) { 250 err = -ENODEV; 251 goto out; 252 } 253 254 if (addr->broadcast != TIPC_REPLICAST_SUPPORT) 255 return tipc_udp_xmit(net, skb, ub, src, dst, 256 &ub->rcast.dst_cache); 257 258 /* Replicast, send an skb to each configured IP address */ 259 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { 260 struct sk_buff *_skb; 261 262 _skb = pskb_copy(skb, GFP_ATOMIC); 263 if (!_skb) { 264 err = -ENOMEM; 265 goto out; 266 } 267 268 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr, 269 &rcast->dst_cache); 270 if (err) 271 goto out; 272 } 273 err = 0; 274 out: 275 kfree_skb(skb); 276 return err; 277 } 278 279 static bool tipc_udp_is_known_peer(struct tipc_bearer *b, 280 struct udp_media_addr *addr) 281 { 282 struct udp_replicast *rcast, *tmp; 283 struct udp_bearer *ub; 284 285 ub = rcu_dereference_rtnl(b->media_ptr); 286 if (!ub) { 287 pr_err_ratelimited("UDP bearer instance not found\n"); 288 return false; 289 } 290 291 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 292 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) 293 return true; 294 } 295 296 return false; 297 } 298 299 static int tipc_udp_rcast_add(struct tipc_bearer *b, 300 struct udp_media_addr *addr) 301 { 302 struct udp_replicast *rcast; 303 struct udp_bearer *ub; 304 305 ub = rcu_dereference_rtnl(b->media_ptr); 306 if (!ub) 307 return -ENODEV; 308 309 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC); 310 if (!rcast) 311 return -ENOMEM; 312 313 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) { 314 kfree(rcast); 315 return -ENOMEM; 316 } 317 318 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); 319 320 if (ntohs(addr->proto) == ETH_P_IP) 321 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); 322 #if IS_ENABLED(CONFIG_IPV6) 323 else if (ntohs(addr->proto) == ETH_P_IPV6) 324 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); 325 #endif 326 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 327 list_add_rcu(&rcast->list, &ub->rcast.list); 328 return 0; 329 } 330 331 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) 332 { 333 struct udp_media_addr src = {0}; 334 struct udp_media_addr *dst; 335 336 dst = (struct udp_media_addr *)&b->bcast_addr.value; 337 if (tipc_udp_is_mcast_addr(dst)) 338 return 0; 339 340 src.port = udp_hdr(skb)->source; 341 342 if (ip_hdr(skb)->version == 4) { 343 struct iphdr *iphdr = ip_hdr(skb); 344 345 src.proto = htons(ETH_P_IP); 346 src.ipv4.s_addr = iphdr->saddr; 347 if (ipv4_is_multicast(iphdr->daddr)) 348 return 0; 349 #if IS_ENABLED(CONFIG_IPV6) 350 } else if (ip_hdr(skb)->version == 6) { 351 struct ipv6hdr *iphdr = ipv6_hdr(skb); 352 353 src.proto = htons(ETH_P_IPV6); 354 src.ipv6 = iphdr->saddr; 355 if (ipv6_addr_is_multicast(&iphdr->daddr)) 356 return 0; 357 #endif 358 } else { 359 return 0; 360 } 361 362 if (likely(tipc_udp_is_known_peer(b, &src))) 363 return 0; 364 365 return tipc_udp_rcast_add(b, &src); 366 } 367 368 /* tipc_udp_recv - read data from bearer socket */ 369 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) 370 { 371 struct udp_bearer *ub; 372 struct tipc_bearer *b; 373 struct tipc_msg *hdr; 374 int err; 375 376 ub = rcu_dereference_sk_user_data(sk); 377 if (!ub) { 378 pr_err_ratelimited("Failed to get UDP bearer reference"); 379 goto out; 380 } 381 skb_pull(skb, sizeof(struct udphdr)); 382 hdr = buf_msg(skb); 383 384 b = rcu_dereference(ub->bearer); 385 if (!b) 386 goto out; 387 388 if (b && test_bit(0, &b->up)) { 389 TIPC_SKB_CB(skb)->flags = 0; 390 tipc_rcv(sock_net(sk), skb, b); 391 return 0; 392 } 393 394 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 395 err = tipc_udp_rcast_disc(b, skb); 396 if (err) 397 goto out; 398 } 399 400 out: 401 kfree_skb(skb); 402 return 0; 403 } 404 405 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 406 { 407 int err = 0; 408 struct ip_mreqn mreqn; 409 struct sock *sk = ub->ubsock->sk; 410 411 if (ntohs(remote->proto) == ETH_P_IP) { 412 mreqn.imr_multiaddr = remote->ipv4; 413 mreqn.imr_ifindex = ub->ifindex; 414 err = ip_mc_join_group(sk, &mreqn); 415 #if IS_ENABLED(CONFIG_IPV6) 416 } else { 417 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 418 &remote->ipv6); 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)->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) { 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) { 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 if (tipc_udp_is_known_peer(b, &addr)) 645 return 0; 646 647 return tipc_udp_rcast_add(b, &addr); 648 } 649 650 /** 651 * tipc_udp_enable - callback to create a new udp bearer instance 652 * @net: network namespace 653 * @b: pointer to generic tipc_bearer 654 * @attrs: netlink bearer configuration 655 * 656 * validate the bearer parameters and initialize the udp bearer 657 * rtnl_lock should be held 658 */ 659 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 660 struct nlattr *attrs[]) 661 { 662 int err = -EINVAL; 663 struct udp_bearer *ub; 664 struct udp_media_addr remote = {0}; 665 struct udp_media_addr local = {0}; 666 struct udp_port_cfg udp_conf = {0}; 667 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 668 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 669 u8 node_id[NODE_ID_LEN] = {0,}; 670 struct net_device *dev; 671 int rmcast = 0; 672 673 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 674 if (!ub) 675 return -ENOMEM; 676 677 INIT_LIST_HEAD(&ub->rcast.list); 678 679 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 680 goto err; 681 682 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 683 goto err; 684 685 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 686 pr_err("Invalid UDP bearer configuration"); 687 err = -EINVAL; 688 goto err; 689 } 690 691 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 692 &ub->ifindex); 693 if (err) 694 goto err; 695 696 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 697 if (err) 698 goto err; 699 700 if (remote.proto != local.proto) { 701 err = -EINVAL; 702 goto err; 703 } 704 705 /* Checking remote ip address */ 706 rmcast = tipc_udp_is_mcast_addr(&remote); 707 708 /* Autoconfigure own node identity if needed */ 709 if (!tipc_own_id(net)) { 710 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 711 tipc_net_init(net, node_id, 0); 712 } 713 if (!tipc_own_id(net)) { 714 pr_warn("Failed to set node id, please configure manually\n"); 715 err = -EINVAL; 716 goto err; 717 } 718 719 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 720 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 721 rcu_assign_pointer(b->media_ptr, ub); 722 rcu_assign_pointer(ub->bearer, b); 723 tipc_udp_media_addr_set(&b->addr, &local); 724 if (local.proto == htons(ETH_P_IP)) { 725 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 726 if (!dev) { 727 err = -ENODEV; 728 goto err; 729 } 730 udp_conf.family = AF_INET; 731 732 /* Switch to use ANY to receive packets from group */ 733 if (rmcast) 734 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 735 else 736 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 737 udp_conf.use_udp_checksums = false; 738 ub->ifindex = dev->ifindex; 739 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 740 sizeof(struct udphdr))) { 741 err = -EINVAL; 742 goto err; 743 } 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->mtu = 1280; 762 #endif 763 } else { 764 err = -EAFNOSUPPORT; 765 goto err; 766 } 767 udp_conf.local_udp_port = local.port; 768 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 769 if (err) 770 goto err; 771 tuncfg.sk_user_data = ub; 772 tuncfg.encap_type = 1; 773 tuncfg.encap_rcv = tipc_udp_recv; 774 tuncfg.encap_destroy = NULL; 775 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 776 777 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); 778 if (err) 779 goto free; 780 781 /* 782 * The bcast media address port is used for all peers and the ip 783 * is used if it's a multicast address. 784 */ 785 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 786 if (rmcast) 787 err = enable_mcast(ub, &remote); 788 else 789 err = tipc_udp_rcast_add(b, &remote); 790 if (err) 791 goto free; 792 793 return 0; 794 795 free: 796 dst_cache_destroy(&ub->rcast.dst_cache); 797 udp_tunnel_sock_release(ub->ubsock); 798 err: 799 kfree(ub); 800 return err; 801 } 802 803 /* cleanup_bearer - break the socket/bearer association */ 804 static void cleanup_bearer(struct work_struct *work) 805 { 806 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 807 struct udp_replicast *rcast, *tmp; 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 dst_cache_destroy(&ub->rcast.dst_cache); 816 udp_tunnel_sock_release(ub->ubsock); 817 synchronize_net(); 818 kfree(ub); 819 } 820 821 /* tipc_udp_disable - detach bearer from socket */ 822 static void tipc_udp_disable(struct tipc_bearer *b) 823 { 824 struct udp_bearer *ub; 825 826 ub = rtnl_dereference(b->media_ptr); 827 if (!ub) { 828 pr_err("UDP bearer instance not found\n"); 829 return; 830 } 831 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 832 RCU_INIT_POINTER(ub->bearer, NULL); 833 834 /* sock_release need to be done outside of rtnl lock */ 835 INIT_WORK(&ub->work, cleanup_bearer); 836 schedule_work(&ub->work); 837 } 838 839 struct tipc_media udp_media_info = { 840 .send_msg = tipc_udp_send_msg, 841 .enable_media = tipc_udp_enable, 842 .disable_media = tipc_udp_disable, 843 .addr2str = tipc_udp_addr2str, 844 .addr2msg = tipc_udp_addr2msg, 845 .msg2addr = tipc_udp_msg2addr, 846 .priority = TIPC_DEF_LINK_PRI, 847 .tolerance = TIPC_DEF_LINK_TOL, 848 .min_win = TIPC_DEF_LINK_WIN, 849 .max_win = TIPC_DEF_LINK_WIN, 850 .mtu = TIPC_DEF_LINK_UDP_MTU, 851 .type_id = TIPC_MEDIA_TYPE_UDP, 852 .hwaddr_len = 0, 853 .name = "udp" 854 }; 855