Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 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> |
Marcelo Ricardo Leitner | 446981e | 2015-03-19 16:47:58 -0300 | [diff] [blame] | 47 | #include <net/addrconf.h> |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 48 | #include <linux/tipc_netlink.h> |
| 49 | #include "core.h" |
| 50 | #include "bearer.h" |
Jon Paul Maloy | 5cbb28a | 2015-10-28 13:09:53 -0400 | [diff] [blame] | 51 | #include "msg.h" |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 52 | |
| 53 | /* IANA assigned UDP port */ |
| 54 | #define UDP_PORT_DEFAULT 6118 |
| 55 | |
Jon Paul Maloy | e535679 | 2015-10-19 11:43:11 -0400 | [diff] [blame] | 56 | #define UDP_MIN_HEADROOM 28 |
| 57 | |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 58 | static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = { |
| 59 | [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC}, |
| 60 | [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY, |
| 61 | .len = sizeof(struct sockaddr_storage)}, |
| 62 | [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY, |
| 63 | .len = sizeof(struct sockaddr_storage)}, |
| 64 | }; |
| 65 | |
| 66 | /** |
| 67 | * struct udp_media_addr - IP/UDP addressing information |
| 68 | * |
| 69 | * This is the bearer level originating address used in neighbor discovery |
| 70 | * messages, and all fields should be in network byte order |
| 71 | */ |
| 72 | struct udp_media_addr { |
| 73 | __be16 proto; |
| 74 | __be16 udp_port; |
| 75 | union { |
| 76 | struct in_addr ipv4; |
| 77 | struct in6_addr ipv6; |
| 78 | }; |
| 79 | }; |
| 80 | |
| 81 | /** |
| 82 | * struct udp_bearer - ip/udp bearer data structure |
| 83 | * @bearer: associated generic tipc bearer |
| 84 | * @ubsock: bearer associated socket |
| 85 | * @ifindex: local address scope |
| 86 | * @work: used to schedule deferred work on a bearer |
| 87 | */ |
| 88 | struct udp_bearer { |
| 89 | struct tipc_bearer __rcu *bearer; |
| 90 | struct socket *ubsock; |
| 91 | u32 ifindex; |
| 92 | struct work_struct work; |
| 93 | }; |
| 94 | |
| 95 | /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ |
| 96 | static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, |
| 97 | struct udp_media_addr *ua) |
| 98 | { |
| 99 | memset(addr, 0, sizeof(struct tipc_media_addr)); |
| 100 | addr->media_id = TIPC_MEDIA_TYPE_UDP; |
| 101 | memcpy(addr->value, ua, sizeof(struct udp_media_addr)); |
| 102 | if (ntohs(ua->proto) == ETH_P_IP) { |
| 103 | if (ipv4_is_multicast(ua->ipv4.s_addr)) |
| 104 | addr->broadcast = 1; |
| 105 | } else if (ntohs(ua->proto) == ETH_P_IPV6) { |
| 106 | if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST) |
| 107 | addr->broadcast = 1; |
| 108 | } else { |
| 109 | pr_err("Invalid UDP media address\n"); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /* tipc_udp_addr2str - convert ip/udp address to string */ |
| 114 | static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) |
| 115 | { |
| 116 | struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; |
| 117 | |
| 118 | if (ntohs(ua->proto) == ETH_P_IP) |
| 119 | snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port)); |
| 120 | else if (ntohs(ua->proto) == ETH_P_IPV6) |
| 121 | snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port)); |
| 122 | else |
| 123 | pr_err("Invalid UDP media address\n"); |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ |
| 128 | static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, |
| 129 | char *msg) |
| 130 | { |
| 131 | struct udp_media_addr *ua; |
| 132 | |
| 133 | ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); |
| 134 | if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) |
| 135 | return -EINVAL; |
| 136 | tipc_udp_media_addr_set(a, ua); |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ |
| 141 | static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) |
| 142 | { |
| 143 | memset(msg, 0, TIPC_MEDIA_INFO_SIZE); |
| 144 | msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; |
| 145 | memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, |
| 146 | sizeof(struct udp_media_addr)); |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | /* tipc_send_msg - enqueue a send request */ |
| 151 | static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, |
| 152 | struct tipc_bearer *b, |
| 153 | struct tipc_media_addr *dest) |
| 154 | { |
| 155 | int ttl, err = 0; |
| 156 | struct udp_bearer *ub; |
| 157 | struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value; |
| 158 | struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 159 | struct rtable *rt; |
| 160 | |
Ying Xue | 7098356 | 2015-11-24 13:57:57 +0800 | [diff] [blame] | 161 | if (skb_headroom(skb) < UDP_MIN_HEADROOM) { |
| 162 | err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); |
| 163 | if (err) |
| 164 | goto tx_error; |
| 165 | } |
Jon Paul Maloy | e535679 | 2015-10-19 11:43:11 -0400 | [diff] [blame] | 166 | |
Jon Paul Maloy | 7214bcf | 2015-10-22 08:51:45 -0400 | [diff] [blame] | 167 | skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 168 | ub = rcu_dereference_rtnl(b->media_ptr); |
| 169 | if (!ub) { |
| 170 | err = -ENODEV; |
| 171 | goto tx_error; |
| 172 | } |
Erik Hugne | 4fee6be8 | 2015-03-09 10:19:31 +0100 | [diff] [blame] | 173 | if (dst->proto == htons(ETH_P_IP)) { |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 174 | struct flowi4 fl = { |
| 175 | .daddr = dst->ipv4.s_addr, |
| 176 | .saddr = src->ipv4.s_addr, |
Jon Paul Maloy | 7214bcf | 2015-10-22 08:51:45 -0400 | [diff] [blame] | 177 | .flowi4_mark = skb->mark, |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 178 | .flowi4_proto = IPPROTO_UDP |
| 179 | }; |
| 180 | rt = ip_route_output_key(net, &fl); |
| 181 | if (IS_ERR(rt)) { |
| 182 | err = PTR_ERR(rt); |
| 183 | goto tx_error; |
| 184 | } |
| 185 | ttl = ip4_dst_hoplimit(&rt->dst); |
Jon Paul Maloy | 7214bcf | 2015-10-22 08:51:45 -0400 | [diff] [blame] | 186 | err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, |
David Miller | 79b16aa | 2015-04-05 22:19:09 -0400 | [diff] [blame] | 187 | src->ipv4.s_addr, |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 188 | dst->ipv4.s_addr, 0, ttl, 0, |
| 189 | src->udp_port, dst->udp_port, |
| 190 | false, true); |
| 191 | if (err < 0) { |
| 192 | ip_rt_put(rt); |
| 193 | goto tx_error; |
| 194 | } |
| 195 | #if IS_ENABLED(CONFIG_IPV6) |
| 196 | } else { |
| 197 | struct dst_entry *ndst; |
| 198 | struct flowi6 fl6 = { |
| 199 | .flowi6_oif = ub->ifindex, |
| 200 | .daddr = dst->ipv6, |
| 201 | .saddr = src->ipv6, |
| 202 | .flowi6_proto = IPPROTO_UDP |
| 203 | }; |
Roopa Prabhu | 343d60a | 2015-07-30 13:34:53 -0700 | [diff] [blame] | 204 | err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst, |
| 205 | &fl6); |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 206 | if (err) |
| 207 | goto tx_error; |
| 208 | ttl = ip6_dst_hoplimit(ndst); |
Jon Paul Maloy | 7214bcf | 2015-10-22 08:51:45 -0400 | [diff] [blame] | 209 | err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, |
David Miller | 79b16aa | 2015-04-05 22:19:09 -0400 | [diff] [blame] | 210 | ndst->dev, &src->ipv6, |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 211 | &dst->ipv6, 0, ttl, src->udp_port, |
| 212 | dst->udp_port, false); |
| 213 | #endif |
| 214 | } |
| 215 | return err; |
| 216 | |
| 217 | tx_error: |
Jon Paul Maloy | 7214bcf | 2015-10-22 08:51:45 -0400 | [diff] [blame] | 218 | kfree_skb(skb); |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 219 | return err; |
| 220 | } |
| 221 | |
| 222 | /* tipc_udp_recv - read data from bearer socket */ |
| 223 | static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) |
| 224 | { |
| 225 | struct udp_bearer *ub; |
| 226 | struct tipc_bearer *b; |
Jon Paul Maloy | 5cbb28a | 2015-10-28 13:09:53 -0400 | [diff] [blame] | 227 | int usr = msg_user(buf_msg(skb)); |
| 228 | |
| 229 | if ((usr == LINK_PROTOCOL) || (usr == NAME_DISTRIBUTOR)) |
| 230 | skb_linearize(skb); |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 231 | |
| 232 | ub = rcu_dereference_sk_user_data(sk); |
| 233 | if (!ub) { |
| 234 | pr_err_ratelimited("Failed to get UDP bearer reference"); |
| 235 | kfree_skb(skb); |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | skb_pull(skb, sizeof(struct udphdr)); |
| 240 | rcu_read_lock(); |
| 241 | b = rcu_dereference_rtnl(ub->bearer); |
| 242 | |
| 243 | if (b) { |
| 244 | tipc_rcv(sock_net(sk), skb, b); |
| 245 | rcu_read_unlock(); |
| 246 | return 0; |
| 247 | } |
| 248 | rcu_read_unlock(); |
| 249 | kfree_skb(skb); |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) |
| 254 | { |
| 255 | int err = 0; |
| 256 | struct ip_mreqn mreqn; |
| 257 | struct sock *sk = ub->ubsock->sk; |
| 258 | |
| 259 | if (ntohs(remote->proto) == ETH_P_IP) { |
| 260 | if (!ipv4_is_multicast(remote->ipv4.s_addr)) |
| 261 | return 0; |
| 262 | mreqn.imr_multiaddr = remote->ipv4; |
| 263 | mreqn.imr_ifindex = ub->ifindex; |
Marcelo Ricardo Leitner | 54ff9ef | 2015-03-18 14:50:43 -0300 | [diff] [blame] | 264 | err = ip_mc_join_group(sk, &mreqn); |
Marcelo Ricardo Leitner | 446981e | 2015-03-19 16:47:58 -0300 | [diff] [blame] | 265 | #if IS_ENABLED(CONFIG_IPV6) |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 266 | } else { |
| 267 | if (!ipv6_addr_is_multicast(&remote->ipv6)) |
| 268 | return 0; |
Marcelo Ricardo Leitner | 446981e | 2015-03-19 16:47:58 -0300 | [diff] [blame] | 269 | err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, |
| 270 | &remote->ipv6); |
| 271 | #endif |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 272 | } |
| 273 | return err; |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * parse_options - build local/remote addresses from configuration |
| 278 | * @attrs: netlink config data |
| 279 | * @ub: UDP bearer instance |
| 280 | * @local: local bearer IP address/port |
| 281 | * @remote: peer or multicast IP/port |
| 282 | */ |
| 283 | static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub, |
| 284 | struct udp_media_addr *local, |
| 285 | struct udp_media_addr *remote) |
| 286 | { |
| 287 | struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; |
| 288 | struct sockaddr_storage *sa_local, *sa_remote; |
| 289 | |
| 290 | if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) |
| 291 | goto err; |
| 292 | if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, |
| 293 | attrs[TIPC_NLA_BEARER_UDP_OPTS], |
| 294 | tipc_nl_udp_policy)) |
| 295 | goto err; |
| 296 | if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) { |
| 297 | sa_local = nla_data(opts[TIPC_NLA_UDP_LOCAL]); |
| 298 | sa_remote = nla_data(opts[TIPC_NLA_UDP_REMOTE]); |
| 299 | } else { |
| 300 | err: |
| 301 | pr_err("Invalid UDP bearer configuration"); |
| 302 | return -EINVAL; |
| 303 | } |
| 304 | if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET) { |
| 305 | struct sockaddr_in *ip4; |
| 306 | |
| 307 | ip4 = (struct sockaddr_in *)sa_local; |
| 308 | local->proto = htons(ETH_P_IP); |
| 309 | local->udp_port = ip4->sin_port; |
| 310 | local->ipv4.s_addr = ip4->sin_addr.s_addr; |
| 311 | |
| 312 | ip4 = (struct sockaddr_in *)sa_remote; |
| 313 | remote->proto = htons(ETH_P_IP); |
| 314 | remote->udp_port = ip4->sin_port; |
| 315 | remote->ipv4.s_addr = ip4->sin_addr.s_addr; |
| 316 | return 0; |
| 317 | |
| 318 | #if IS_ENABLED(CONFIG_IPV6) |
| 319 | } else if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET6) { |
| 320 | struct sockaddr_in6 *ip6; |
| 321 | |
| 322 | ip6 = (struct sockaddr_in6 *)sa_local; |
| 323 | local->proto = htons(ETH_P_IPV6); |
| 324 | local->udp_port = ip6->sin6_port; |
| 325 | local->ipv6 = ip6->sin6_addr; |
| 326 | ub->ifindex = ip6->sin6_scope_id; |
| 327 | |
| 328 | ip6 = (struct sockaddr_in6 *)sa_remote; |
| 329 | remote->proto = htons(ETH_P_IPV6); |
| 330 | remote->udp_port = ip6->sin6_port; |
| 331 | remote->ipv6 = ip6->sin6_addr; |
| 332 | return 0; |
| 333 | #endif |
| 334 | } |
| 335 | return -EADDRNOTAVAIL; |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * tipc_udp_enable - callback to create a new udp bearer instance |
| 340 | * @net: network namespace |
| 341 | * @b: pointer to generic tipc_bearer |
| 342 | * @attrs: netlink bearer configuration |
| 343 | * |
| 344 | * validate the bearer parameters and initialize the udp bearer |
| 345 | * rtnl_lock should be held |
| 346 | */ |
| 347 | static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, |
| 348 | struct nlattr *attrs[]) |
| 349 | { |
| 350 | int err = -EINVAL; |
| 351 | struct udp_bearer *ub; |
| 352 | struct udp_media_addr *remote; |
| 353 | struct udp_media_addr local = {0}; |
| 354 | struct udp_port_cfg udp_conf = {0}; |
Erik Hugne | 4fee6be8 | 2015-03-09 10:19:31 +0100 | [diff] [blame] | 355 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 356 | |
| 357 | ub = kzalloc(sizeof(*ub), GFP_ATOMIC); |
| 358 | if (!ub) |
| 359 | return -ENOMEM; |
| 360 | |
| 361 | remote = (struct udp_media_addr *)&b->bcast_addr.value; |
| 362 | memset(remote, 0, sizeof(struct udp_media_addr)); |
| 363 | err = parse_options(attrs, ub, &local, remote); |
| 364 | if (err) |
| 365 | goto err; |
| 366 | |
| 367 | b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; |
| 368 | b->bcast_addr.broadcast = 1; |
| 369 | rcu_assign_pointer(b->media_ptr, ub); |
| 370 | rcu_assign_pointer(ub->bearer, b); |
| 371 | tipc_udp_media_addr_set(&b->addr, &local); |
Erik Hugne | 4fee6be8 | 2015-03-09 10:19:31 +0100 | [diff] [blame] | 372 | if (local.proto == htons(ETH_P_IP)) { |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 373 | struct net_device *dev; |
| 374 | |
| 375 | dev = __ip_dev_find(net, local.ipv4.s_addr, false); |
| 376 | if (!dev) { |
| 377 | err = -ENODEV; |
| 378 | goto err; |
| 379 | } |
| 380 | udp_conf.family = AF_INET; |
| 381 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); |
| 382 | udp_conf.use_udp_checksums = false; |
| 383 | ub->ifindex = dev->ifindex; |
| 384 | b->mtu = dev->mtu - sizeof(struct iphdr) |
| 385 | - sizeof(struct udphdr); |
| 386 | #if IS_ENABLED(CONFIG_IPV6) |
Erik Hugne | 4fee6be8 | 2015-03-09 10:19:31 +0100 | [diff] [blame] | 387 | } else if (local.proto == htons(ETH_P_IPV6)) { |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 388 | udp_conf.family = AF_INET6; |
| 389 | udp_conf.use_udp6_tx_checksums = true; |
| 390 | udp_conf.use_udp6_rx_checksums = true; |
| 391 | udp_conf.local_ip6 = in6addr_any; |
| 392 | b->mtu = 1280; |
| 393 | #endif |
| 394 | } else { |
| 395 | err = -EAFNOSUPPORT; |
| 396 | goto err; |
| 397 | } |
| 398 | udp_conf.local_udp_port = local.udp_port; |
| 399 | err = udp_sock_create(net, &udp_conf, &ub->ubsock); |
| 400 | if (err) |
| 401 | goto err; |
| 402 | tuncfg.sk_user_data = ub; |
| 403 | tuncfg.encap_type = 1; |
| 404 | tuncfg.encap_rcv = tipc_udp_recv; |
| 405 | tuncfg.encap_destroy = NULL; |
| 406 | setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); |
| 407 | |
| 408 | if (enable_mcast(ub, remote)) |
| 409 | goto err; |
| 410 | return 0; |
| 411 | err: |
| 412 | kfree(ub); |
| 413 | return err; |
| 414 | } |
| 415 | |
| 416 | /* cleanup_bearer - break the socket/bearer association */ |
| 417 | static void cleanup_bearer(struct work_struct *work) |
| 418 | { |
| 419 | struct udp_bearer *ub = container_of(work, struct udp_bearer, work); |
| 420 | |
| 421 | if (ub->ubsock) |
| 422 | udp_tunnel_sock_release(ub->ubsock); |
| 423 | synchronize_net(); |
| 424 | kfree(ub); |
| 425 | } |
| 426 | |
| 427 | /* tipc_udp_disable - detach bearer from socket */ |
| 428 | static void tipc_udp_disable(struct tipc_bearer *b) |
| 429 | { |
| 430 | struct udp_bearer *ub; |
| 431 | |
| 432 | ub = rcu_dereference_rtnl(b->media_ptr); |
| 433 | if (!ub) { |
| 434 | pr_err("UDP bearer instance not found\n"); |
| 435 | return; |
| 436 | } |
| 437 | if (ub->ubsock) |
| 438 | sock_set_flag(ub->ubsock->sk, SOCK_DEAD); |
Erik Hugne | d0f9193 | 2015-03-05 10:23:49 +0100 | [diff] [blame] | 439 | RCU_INIT_POINTER(ub->bearer, NULL); |
| 440 | |
| 441 | /* sock_release need to be done outside of rtnl lock */ |
| 442 | INIT_WORK(&ub->work, cleanup_bearer); |
| 443 | schedule_work(&ub->work); |
| 444 | } |
| 445 | |
| 446 | struct tipc_media udp_media_info = { |
| 447 | .send_msg = tipc_udp_send_msg, |
| 448 | .enable_media = tipc_udp_enable, |
| 449 | .disable_media = tipc_udp_disable, |
| 450 | .addr2str = tipc_udp_addr2str, |
| 451 | .addr2msg = tipc_udp_addr2msg, |
| 452 | .msg2addr = tipc_udp_msg2addr, |
| 453 | .priority = TIPC_DEF_LINK_PRI, |
| 454 | .tolerance = TIPC_DEF_LINK_TOL, |
| 455 | .window = TIPC_DEF_LINK_WIN, |
| 456 | .type_id = TIPC_MEDIA_TYPE_UDP, |
| 457 | .hwaddr_len = 0, |
| 458 | .name = "udp" |
| 459 | }; |