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 */ 73struct 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 */ 83struct 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 */ 98struct 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 106static 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 */ 118static 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 */ 130static 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 */ 144static 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 */ 157static 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 */ 167static 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 225tx_error: 226 local_bh_enable(); 227 kfree_skb(skb); 228 return err; 229} 230 231static 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; 274out: 275 kfree_skb(skb); 276 return err; 277} 278 279static 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 299static 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 331static 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 */ 369static 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 400out: 401 kfree_skb(skb); 402 return 0; 403} 404 405static 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 lock_sock(sk); 418 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 419 &remote->ipv6); 420 release_sock(sk); 421#endif 422 } 423 return err; 424} 425 426static 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 455int 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) { 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) { 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); 530count: 531 i++; 532 } 533done: 534 rtnl_unlock(); 535 cb->args[0] = bid; 536 cb->args[1] = i; 537 538 return skb->len; 539} 540 541int 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; 570msg_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 582static 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 623int 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 */ 661static 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(sizeof(*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 794free: 795 dst_cache_destroy(&ub->rcast.dst_cache); 796 udp_tunnel_sock_release(ub->ubsock); 797err: 798 kfree(ub); 799 return err; 800} 801 802/* cleanup_bearer - break the socket/bearer association */ 803static 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; 807 808 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 809 dst_cache_destroy(&rcast->dst_cache); 810 list_del_rcu(&rcast->list); 811 kfree_rcu(rcast, rcu); 812 } 813 814 atomic_dec(&tipc_net(sock_net(ub->ubsock->sk))->wq_count); 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 */ 822static 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 atomic_inc(&tipc_net(sock_net(ub->ubsock->sk))->wq_count); 836 INIT_WORK(&ub->work, cleanup_bearer); 837 schedule_work(&ub->work); 838} 839 840struct tipc_media udp_media_info = { 841 .send_msg = tipc_udp_send_msg, 842 .enable_media = tipc_udp_enable, 843 .disable_media = tipc_udp_disable, 844 .addr2str = tipc_udp_addr2str, 845 .addr2msg = tipc_udp_addr2msg, 846 .msg2addr = tipc_udp_msg2addr, 847 .priority = TIPC_DEF_LINK_PRI, 848 .tolerance = TIPC_DEF_LINK_TOL, 849 .min_win = TIPC_DEF_LINK_WIN, 850 .max_win = TIPC_DEF_LINK_WIN, 851 .mtu = TIPC_DEF_LINK_UDP_MTU, 852 .type_id = TIPC_MEDIA_TYPE_UDP, 853 .hwaddr_len = 0, 854 .name = "udp" 855}; 856