net/tipc/udp

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This source file includes following definitions.
tipc_udp_is_mcast_addr
tipc_udp_media_addr_set
tipc_udp_addr2str
tipc_udp_msg2addr
tipc_udp_addr2msg
tipc_udp_xmit
tipc_udp_send_msg
tipc_udp_is_known_peer
tipc_udp_rcast_add
tipc_udp_rcast_disc
tipc_udp_recv
enable_mcast
__tipc_nl_add_udp_addr
tipc_udp_nl_dump_remoteip
tipc_udp_nl_add_bearer_data
tipc_parse_udp_addr
tipc_udp_nl_bearer_add
tipc_udp_enable
cleanup_bearer
tipc_udp_disable
   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 
  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 struct udp_media_addr {
  68         __be16  proto;
  69         __be16  port;
  70         union {
  71                 struct in_addr ipv4;
  72                 struct in6_addr ipv6;
  73         };
  74 };
  75 
  76 /* struct udp_replicast - container for UDP remote addresses */
  77 struct udp_replicast {
  78         struct udp_media_addr addr;
  79         struct dst_cache dst_cache;
  80         struct rcu_head rcu;
  81         struct list_head list;
  82 };
  83 
  84 /**
  85  * struct udp_bearer - ip/udp bearer data structure
  86  * @bearer:     associated generic tipc bearer
  87  * @ubsock:     bearer associated socket
  88  * @ifindex:    local address scope
  89  * @work:       used to schedule deferred work on a bearer
  90  */
  91 struct udp_bearer {
  92         struct tipc_bearer __rcu *bearer;
  93         struct socket *ubsock;
  94         u32 ifindex;
  95         struct work_struct work;
  96         struct udp_replicast rcast;
  97 };
  98 
  99 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
 100 {
 101         if (ntohs(addr->proto) == ETH_P_IP)
 102                 return ipv4_is_multicast(addr->ipv4.s_addr);
 103 #if IS_ENABLED(CONFIG_IPV6)
 104         else
 105                 return ipv6_addr_is_multicast(&addr->ipv6);
 106 #endif
 107         return 0;
 108 }
 109 
 110 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
 111 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
 112                                     struct udp_media_addr *ua)
 113 {
 114         memset(addr, 0, sizeof(struct tipc_media_addr));
 115         addr->media_id = TIPC_MEDIA_TYPE_UDP;
 116         memcpy(addr->value, ua, sizeof(struct udp_media_addr));
 117 
 118         if (tipc_udp_is_mcast_addr(ua))
 119                 addr->broadcast = TIPC_BROADCAST_SUPPORT;
 120 }
 121 
 122 /* tipc_udp_addr2str - convert ip/udp address to string */
 123 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
 124 {
 125         struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
 126 
 127         if (ntohs(ua->proto) == ETH_P_IP)
 128                 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
 129         else if (ntohs(ua->proto) == ETH_P_IPV6)
 130                 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
 131         else
 132                 pr_err("Invalid UDP media address\n");
 133         return 0;
 134 }
 135 
 136 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
 137 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
 138                              char *msg)
 139 {
 140         struct udp_media_addr *ua;
 141 
 142         ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
 143         if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
 144                 return -EINVAL;
 145         tipc_udp_media_addr_set(a, ua);
 146         return 0;
 147 }
 148 
 149 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
 150 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
 151 {
 152         memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
 153         msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
 154         memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
 155                sizeof(struct udp_media_addr));
 156         return 0;
 157 }
 158 
 159 /* tipc_send_msg - enqueue a send request */
 160 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
 161                          struct udp_bearer *ub, struct udp_media_addr *src,
 162                          struct udp_media_addr *dst, struct dst_cache *cache)
 163 {
 164         struct dst_entry *ndst;
 165         int ttl, err = 0;
 166 
 167         local_bh_disable();
 168         ndst = dst_cache_get(cache);
 169         if (dst->proto == htons(ETH_P_IP)) {
 170                 struct rtable *rt = (struct rtable *)ndst;
 171 
 172                 if (!rt) {
 173                         struct flowi4 fl = {
 174                                 .daddr = dst->ipv4.s_addr,
 175                                 .saddr = src->ipv4.s_addr,
 176                                 .flowi4_mark = skb->mark,
 177                                 .flowi4_proto = IPPROTO_UDP
 178                         };
 179                         rt = ip_route_output_key(net, &fl);
 180                         if (IS_ERR(rt)) {
 181                                 err = PTR_ERR(rt);
 182                                 goto tx_error;
 183                         }
 184                         dst_cache_set_ip4(cache, &rt->dst, fl.saddr);
 185                 }
 186 
 187                 ttl = ip4_dst_hoplimit(&rt->dst);
 188                 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
 189                                     dst->ipv4.s_addr, 0, ttl, 0, src->port,
 190                                     dst->port, false, true);
 191 #if IS_ENABLED(CONFIG_IPV6)
 192         } else {
 193                 if (!ndst) {
 194                         struct flowi6 fl6 = {
 195                                 .flowi6_oif = ub->ifindex,
 196                                 .daddr = dst->ipv6,
 197                                 .saddr = src->ipv6,
 198                                 .flowi6_proto = IPPROTO_UDP
 199                         };
 200                         ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
 201                                                                ub->ubsock->sk,
 202                                                                &fl6, NULL);
 203                         if (IS_ERR(ndst)) {
 204                                 err = PTR_ERR(ndst);
 205                                 goto tx_error;
 206                         }
 207                         dst_cache_set_ip6(cache, ndst, &fl6.saddr);
 208                 }
 209                 ttl = ip6_dst_hoplimit(ndst);
 210                 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,
 211                                            &src->ipv6, &dst->ipv6, 0, ttl, 0,
 212                                            src->port, dst->port, false);
 213 #endif
 214         }
 215         local_bh_enable();
 216         return err;
 217 
 218 tx_error:
 219         local_bh_enable();
 220         kfree_skb(skb);
 221         return err;
 222 }
 223 
 224 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
 225                              struct tipc_bearer *b,
 226                              struct tipc_media_addr *addr)
 227 {
 228         struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
 229         struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
 230         struct udp_replicast *rcast;
 231         struct udp_bearer *ub;
 232         int err = 0;
 233 
 234         if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
 235                 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
 236                 if (err)
 237                         goto out;
 238         }
 239 
 240         skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
 241         ub = rcu_dereference(b->media_ptr);
 242         if (!ub) {
 243                 err = -ENODEV;
 244                 goto out;
 245         }
 246 
 247         if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
 248                 return tipc_udp_xmit(net, skb, ub, src, dst,
 249                                      &ub->rcast.dst_cache);
 250 
 251         /* Replicast, send an skb to each configured IP address */
 252         list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
 253                 struct sk_buff *_skb;
 254 
 255                 _skb = pskb_copy(skb, GFP_ATOMIC);
 256                 if (!_skb) {
 257                         err = -ENOMEM;
 258                         goto out;
 259                 }
 260 
 261                 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr,
 262                                     &rcast->dst_cache);
 263                 if (err)
 264                         goto out;
 265         }
 266         err = 0;
 267 out:
 268         kfree_skb(skb);
 269         return err;
 270 }
 271 
 272 static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
 273                                    struct udp_media_addr *addr)
 274 {
 275         struct udp_replicast *rcast, *tmp;
 276         struct udp_bearer *ub;
 277 
 278         ub = rcu_dereference_rtnl(b->media_ptr);
 279         if (!ub) {
 280                 pr_err_ratelimited("UDP bearer instance not found\n");
 281                 return false;
 282         }
 283 
 284         list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
 285                 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
 286                         return true;
 287         }
 288 
 289         return false;
 290 }
 291 
 292 static int tipc_udp_rcast_add(struct tipc_bearer *b,
 293                               struct udp_media_addr *addr)
 294 {
 295         struct udp_replicast *rcast;
 296         struct udp_bearer *ub;
 297 
 298         ub = rcu_dereference_rtnl(b->media_ptr);
 299         if (!ub)
 300                 return -ENODEV;
 301 
 302         rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
 303         if (!rcast)
 304                 return -ENOMEM;
 305 
 306         if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) {
 307                 kfree(rcast);
 308                 return -ENOMEM;
 309         }
 310 
 311         memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
 312 
 313         if (ntohs(addr->proto) == ETH_P_IP)
 314                 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
 315 #if IS_ENABLED(CONFIG_IPV6)
 316         else if (ntohs(addr->proto) == ETH_P_IPV6)
 317                 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
 318 #endif
 319         b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
 320         list_add_rcu(&rcast->list, &ub->rcast.list);
 321         return 0;
 322 }
 323 
 324 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
 325 {
 326         struct udp_media_addr src = {0};
 327         struct udp_media_addr *dst;
 328 
 329         dst = (struct udp_media_addr *)&b->bcast_addr.value;
 330         if (tipc_udp_is_mcast_addr(dst))
 331                 return 0;
 332 
 333         src.port = udp_hdr(skb)->source;
 334 
 335         if (ip_hdr(skb)->version == 4) {
 336                 struct iphdr *iphdr = ip_hdr(skb);
 337 
 338                 src.proto = htons(ETH_P_IP);
 339                 src.ipv4.s_addr = iphdr->saddr;
 340                 if (ipv4_is_multicast(iphdr->daddr))
 341                         return 0;
 342 #if IS_ENABLED(CONFIG_IPV6)
 343         } else if (ip_hdr(skb)->version == 6) {
 344                 struct ipv6hdr *iphdr = ipv6_hdr(skb);
 345 
 346                 src.proto = htons(ETH_P_IPV6);
 347                 src.ipv6 = iphdr->saddr;
 348                 if (ipv6_addr_is_multicast(&iphdr->daddr))
 349                         return 0;
 350 #endif
 351         } else {
 352                 return 0;
 353         }
 354 
 355         if (likely(tipc_udp_is_known_peer(b, &src)))
 356                 return 0;
 357 
 358         return tipc_udp_rcast_add(b, &src);
 359 }
 360 
 361 /* tipc_udp_recv - read data from bearer socket */
 362 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
 363 {
 364         struct udp_bearer *ub;
 365         struct tipc_bearer *b;
 366         struct tipc_msg *hdr;
 367         int err;
 368 
 369         ub = rcu_dereference_sk_user_data(sk);
 370         if (!ub) {
 371                 pr_err_ratelimited("Failed to get UDP bearer reference");
 372                 goto out;
 373         }
 374         skb_pull(skb, sizeof(struct udphdr));
 375         hdr = buf_msg(skb);
 376 
 377         b = rcu_dereference(ub->bearer);
 378         if (!b)
 379                 goto out;
 380 
 381         if (b && test_bit(0, &b->up)) {
 382                 tipc_rcv(sock_net(sk), skb, b);
 383                 return 0;
 384         }
 385 
 386         if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
 387                 err = tipc_udp_rcast_disc(b, skb);
 388                 if (err)
 389                         goto out;
 390         }
 391 
 392 out:
 393         kfree_skb(skb);
 394         return 0;
 395 }
 396 
 397 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
 398 {
 399         int err = 0;
 400         struct ip_mreqn mreqn;
 401         struct sock *sk = ub->ubsock->sk;
 402 
 403         if (ntohs(remote->proto) == ETH_P_IP) {
 404                 mreqn.imr_multiaddr = remote->ipv4;
 405                 mreqn.imr_ifindex = ub->ifindex;
 406                 err = ip_mc_join_group(sk, &mreqn);
 407 #if IS_ENABLED(CONFIG_IPV6)
 408         } else {
 409                 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
 410                                                    &remote->ipv6);
 411 #endif
 412         }
 413         return err;
 414 }
 415 
 416 static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
 417                                   struct udp_media_addr *addr, int nla_t)
 418 {
 419         if (ntohs(addr->proto) == ETH_P_IP) {
 420                 struct sockaddr_in ip4;
 421 
 422                 memset(&ip4, 0, sizeof(ip4));
 423                 ip4.sin_family = AF_INET;
 424                 ip4.sin_port = addr->port;
 425                 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
 426                 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
 427                         return -EMSGSIZE;
 428 
 429 #if IS_ENABLED(CONFIG_IPV6)
 430         } else if (ntohs(addr->proto) == ETH_P_IPV6) {
 431                 struct sockaddr_in6 ip6;
 432 
 433                 memset(&ip6, 0, sizeof(ip6));
 434                 ip6.sin6_family = AF_INET6;
 435                 ip6.sin6_port  = addr->port;
 436                 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
 437                 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
 438                         return -EMSGSIZE;
 439 #endif
 440         }
 441 
 442         return 0;
 443 }
 444 
 445 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
 446 {
 447         u32 bid = cb->args[0];
 448         u32 skip_cnt = cb->args[1];
 449         u32 portid = NETLINK_CB(cb->skb).portid;
 450         struct udp_replicast *rcast, *tmp;
 451         struct tipc_bearer *b;
 452         struct udp_bearer *ub;
 453         void *hdr;
 454         int err;
 455         int i;
 456 
 457         if (!bid && !skip_cnt) {
 458                 struct net *net = sock_net(skb->sk);
 459                 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
 460                 struct nlattr **attrs;
 461                 char *bname;
 462 
 463                 err = tipc_nlmsg_parse(cb->nlh, &attrs);
 464                 if (err)
 465                         return err;
 466 
 467                 if (!attrs[TIPC_NLA_BEARER])
 468                         return -EINVAL;
 469 
 470                 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX,
 471                                                   attrs[TIPC_NLA_BEARER],
 472                                                   tipc_nl_bearer_policy, NULL);
 473                 if (err)
 474                         return err;
 475 
 476                 if (!battrs[TIPC_NLA_BEARER_NAME])
 477                         return -EINVAL;
 478 
 479                 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
 480 
 481                 rtnl_lock();
 482                 b = tipc_bearer_find(net, bname);
 483                 if (!b) {
 484                         rtnl_unlock();
 485                         return -EINVAL;
 486                 }
 487                 bid = b->identity;
 488         } else {
 489                 struct net *net = sock_net(skb->sk);
 490                 struct tipc_net *tn = net_generic(net, tipc_net_id);
 491 
 492                 rtnl_lock();
 493                 b = rtnl_dereference(tn->bearer_list[bid]);
 494                 if (!b) {
 495                         rtnl_unlock();
 496                         return -EINVAL;
 497                 }
 498         }
 499 
 500         ub = rtnl_dereference(b->media_ptr);
 501         if (!ub) {
 502                 rtnl_unlock();
 503                 return -EINVAL;
 504         }
 505 
 506         i = 0;
 507         list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
 508                 if (i < skip_cnt)
 509                         goto count;
 510 
 511                 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
 512                                   &tipc_genl_family, NLM_F_MULTI,
 513                                   TIPC_NL_BEARER_GET);
 514                 if (!hdr)
 515                         goto done;
 516 
 517                 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
 518                                              TIPC_NLA_UDP_REMOTE);
 519                 if (err) {
 520                         genlmsg_cancel(skb, hdr);
 521                         goto done;
 522                 }
 523                 genlmsg_end(skb, hdr);
 524 count:
 525                 i++;
 526         }
 527 done:
 528         rtnl_unlock();
 529         cb->args[0] = bid;
 530         cb->args[1] = i;
 531 
 532         return skb->len;
 533 }
 534 
 535 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
 536 {
 537         struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
 538         struct udp_media_addr *dst;
 539         struct udp_bearer *ub;
 540         struct nlattr *nest;
 541 
 542         ub = rtnl_dereference(b->media_ptr);
 543         if (!ub)
 544                 return -ENODEV;
 545 
 546         nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
 547         if (!nest)
 548                 goto msg_full;
 549 
 550         if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
 551                 goto msg_full;
 552 
 553         dst = (struct udp_media_addr *)&b->bcast_addr.value;
 554         if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
 555                 goto msg_full;
 556 
 557         if (!list_empty(&ub->rcast.list)) {
 558                 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
 559                         goto msg_full;
 560         }
 561 
 562         nla_nest_end(msg->skb, nest);
 563         return 0;
 564 msg_full:
 565         nla_nest_cancel(msg->skb, nest);
 566         return -EMSGSIZE;
 567 }
 568 
 569 /**
 570  * tipc_parse_udp_addr - build udp media address from netlink data
 571  * @nlattr:     netlink attribute containing sockaddr storage aligned address
 572  * @addr:       tipc media address to fill with address, port and protocol type
 573  * @scope_id:   IPv6 scope id pointer, not NULL indicates it's required
 574  */
 575 
 576 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
 577                                u32 *scope_id)
 578 {
 579         struct sockaddr_storage sa;
 580 
 581         nla_memcpy(&sa, nla, sizeof(sa));
 582         if (sa.ss_family == AF_INET) {
 583                 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
 584 
 585                 addr->proto = htons(ETH_P_IP);
 586                 addr->port = ip4->sin_port;
 587                 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
 588                 return 0;
 589 
 590 #if IS_ENABLED(CONFIG_IPV6)
 591         } else if (sa.ss_family == AF_INET6) {
 592                 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
 593 
 594                 addr->proto = htons(ETH_P_IPV6);
 595                 addr->port = ip6->sin6_port;
 596                 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
 597 
 598                 /* Scope ID is only interesting for local addresses */
 599                 if (scope_id) {
 600                         int atype;
 601 
 602                         atype = ipv6_addr_type(&ip6->sin6_addr);
 603                         if (__ipv6_addr_needs_scope_id(atype) &&
 604                             !ip6->sin6_scope_id) {
 605                                 return -EINVAL;
 606                         }
 607 
 608                         *scope_id = ip6->sin6_scope_id ? : 0;
 609                 }
 610 
 611                 return 0;
 612 #endif
 613         }
 614         return -EADDRNOTAVAIL;
 615 }
 616 
 617 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
 618 {
 619         int err;
 620         struct udp_media_addr addr = {0};
 621         struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
 622         struct udp_media_addr *dst;
 623 
 624         if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL))
 625                 return -EINVAL;
 626 
 627         if (!opts[TIPC_NLA_UDP_REMOTE])
 628                 return -EINVAL;
 629 
 630         err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
 631         if (err)
 632                 return err;
 633 
 634         dst = (struct udp_media_addr *)&b->bcast_addr.value;
 635         if (tipc_udp_is_mcast_addr(dst)) {
 636                 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
 637                 return -EINVAL;
 638         }
 639 
 640         if (tipc_udp_is_known_peer(b, &addr))
 641                 return 0;
 642 
 643         return tipc_udp_rcast_add(b, &addr);
 644 }
 645 
 646 /**
 647  * tipc_udp_enable - callback to create a new udp bearer instance
 648  * @net:        network namespace
 649  * @b:          pointer to generic tipc_bearer
 650  * @attrs:      netlink bearer configuration
 651  *
 652  * validate the bearer parameters and initialize the udp bearer
 653  * rtnl_lock should be held
 654  */
 655 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
 656                            struct nlattr *attrs[])
 657 {
 658         int err = -EINVAL;
 659         struct udp_bearer *ub;
 660         struct udp_media_addr remote = {0};
 661         struct udp_media_addr local = {0};
 662         struct udp_port_cfg udp_conf = {0};
 663         struct udp_tunnel_sock_cfg tuncfg = {NULL};
 664         struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
 665         u8 node_id[NODE_ID_LEN] = {0,};
 666         int rmcast = 0;
 667 
 668         ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
 669         if (!ub)
 670                 return -ENOMEM;
 671 
 672         INIT_LIST_HEAD(&ub->rcast.list);
 673 
 674         if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
 675                 goto err;
 676 
 677         if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL))
 678                 goto err;
 679 
 680         if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
 681                 pr_err("Invalid UDP bearer configuration");
 682                 err = -EINVAL;
 683                 goto err;
 684         }
 685 
 686         err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
 687                                   &ub->ifindex);
 688         if (err)
 689                 goto err;
 690 
 691         err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
 692         if (err)
 693                 goto err;
 694 
 695         if (remote.proto != local.proto) {
 696                 err = -EINVAL;
 697                 goto err;
 698         }
 699 
 700         /* Checking remote ip address */
 701         rmcast = tipc_udp_is_mcast_addr(&remote);
 702 
 703         /* Autoconfigure own node identity if needed */
 704         if (!tipc_own_id(net)) {
 705                 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
 706                 tipc_net_init(net, node_id, 0);
 707         }
 708         if (!tipc_own_id(net)) {
 709                 pr_warn("Failed to set node id, please configure manually\n");
 710                 err = -EINVAL;
 711                 goto err;
 712         }
 713 
 714         b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
 715         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
 716         rcu_assign_pointer(b->media_ptr, ub);
 717         rcu_assign_pointer(ub->bearer, b);
 718         tipc_udp_media_addr_set(&b->addr, &local);
 719         if (local.proto == htons(ETH_P_IP)) {
 720                 struct net_device *dev;
 721 
 722                 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
 723                 if (!dev) {
 724                         err = -ENODEV;
 725                         goto err;
 726                 }
 727                 udp_conf.family = AF_INET;
 728 
 729                 /* Switch to use ANY to receive packets from group */
 730                 if (rmcast)
 731                         udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 732                 else
 733                         udp_conf.local_ip.s_addr = local.ipv4.s_addr;
 734                 udp_conf.use_udp_checksums = false;
 735                 ub->ifindex = dev->ifindex;
 736                 if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
 737                                       sizeof(struct udphdr))) {
 738                         err = -EINVAL;
 739                         goto err;
 740                 }
 741                 b->mtu = b->media->mtu;
 742 #if IS_ENABLED(CONFIG_IPV6)
 743         } else if (local.proto == htons(ETH_P_IPV6)) {
 744                 udp_conf.family = AF_INET6;
 745                 udp_conf.use_udp6_tx_checksums = true;
 746                 udp_conf.use_udp6_rx_checksums = true;
 747                 if (rmcast)
 748                         udp_conf.local_ip6 = in6addr_any;
 749                 else
 750                         udp_conf.local_ip6 = local.ipv6;
 751                 b->mtu = 1280;
 752 #endif
 753         } else {
 754                 err = -EAFNOSUPPORT;
 755                 goto err;
 756         }
 757         udp_conf.local_udp_port = local.port;
 758         err = udp_sock_create(net, &udp_conf, &ub->ubsock);
 759         if (err)
 760                 goto err;
 761         tuncfg.sk_user_data = ub;
 762         tuncfg.encap_type = 1;
 763         tuncfg.encap_rcv = tipc_udp_recv;
 764         tuncfg.encap_destroy = NULL;
 765         setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
 766 
 767         err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC);
 768         if (err)
 769                 goto free;
 770 
 771         /**
 772          * The bcast media address port is used for all peers and the ip
 773          * is used if it's a multicast address.
 774          */
 775         memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
 776         if (rmcast)
 777                 err = enable_mcast(ub, &remote);
 778         else
 779                 err = tipc_udp_rcast_add(b, &remote);
 780         if (err)
 781                 goto free;
 782 
 783         return 0;
 784 
 785 free:
 786         dst_cache_destroy(&ub->rcast.dst_cache);
 787         udp_tunnel_sock_release(ub->ubsock);
 788 err:
 789         kfree(ub);
 790         return err;
 791 }
 792 
 793 /* cleanup_bearer - break the socket/bearer association */
 794 static void cleanup_bearer(struct work_struct *work)
 795 {
 796         struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
 797         struct udp_replicast *rcast, *tmp;
 798 
 799         list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
 800                 dst_cache_destroy(&rcast->dst_cache);
 801                 list_del_rcu(&rcast->list);
 802                 kfree_rcu(rcast, rcu);
 803         }
 804 
 805         dst_cache_destroy(&ub->rcast.dst_cache);
 806         udp_tunnel_sock_release(ub->ubsock);
 807         synchronize_net();
 808         kfree(ub);
 809 }
 810 
 811 /* tipc_udp_disable - detach bearer from socket */
 812 static void tipc_udp_disable(struct tipc_bearer *b)
 813 {
 814         struct udp_bearer *ub;
 815 
 816         ub = rtnl_dereference(b->media_ptr);
 817         if (!ub) {
 818                 pr_err("UDP bearer instance not found\n");
 819                 return;
 820         }
 821         sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
 822         RCU_INIT_POINTER(ub->bearer, NULL);
 823 
 824         /* sock_release need to be done outside of rtnl lock */
 825         INIT_WORK(&ub->work, cleanup_bearer);
 826         schedule_work(&ub->work);
 827 }
 828 
 829 struct tipc_media udp_media_info = {
 830         .send_msg       = tipc_udp_send_msg,
 831         .enable_media   = tipc_udp_enable,
 832         .disable_media  = tipc_udp_disable,
 833         .addr2str       = tipc_udp_addr2str,
 834         .addr2msg       = tipc_udp_addr2msg,
 835         .msg2addr       = tipc_udp_msg2addr,
 836         .priority       = TIPC_DEF_LINK_PRI,
 837         .tolerance      = TIPC_DEF_LINK_TOL,
 838         .window         = TIPC_DEF_LINK_WIN,
 839         .mtu            = TIPC_DEF_LINK_UDP_MTU,
 840         .type_id        = TIPC_MEDIA_TYPE_UDP,
 841         .hwaddr_len     = 0,
 842         .name           = "udp"
 843 };
/* [<][>][^][v][top][bottom][index][help] */
root/net/tipc/udp_media.c

DEFINITIONS
