dgram.c revision b67bfe0d42cac56c512dd5da4b1b347a23f4b70a
1/* 2 * IEEE 802.15.4 dgram socket interface 3 * 4 * Copyright 2007, 2008 Siemens AG 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Written by: 20 * Sergey Lapin <slapin@ossfans.org> 21 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> 22 */ 23 24#include <linux/net.h> 25#include <linux/module.h> 26#include <linux/if_arp.h> 27#include <linux/list.h> 28#include <linux/slab.h> 29#include <net/sock.h> 30#include <net/af_ieee802154.h> 31#include <net/ieee802154.h> 32#include <net/ieee802154_netdev.h> 33 34#include <asm/ioctls.h> 35 36#include "af802154.h" 37 38static HLIST_HEAD(dgram_head); 39static DEFINE_RWLOCK(dgram_lock); 40 41struct dgram_sock { 42 struct sock sk; 43 44 struct ieee802154_addr src_addr; 45 struct ieee802154_addr dst_addr; 46 47 unsigned int bound:1; 48 unsigned int want_ack:1; 49}; 50 51static inline struct dgram_sock *dgram_sk(const struct sock *sk) 52{ 53 return container_of(sk, struct dgram_sock, sk); 54} 55 56static void dgram_hash(struct sock *sk) 57{ 58 write_lock_bh(&dgram_lock); 59 sk_add_node(sk, &dgram_head); 60 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 61 write_unlock_bh(&dgram_lock); 62} 63 64static void dgram_unhash(struct sock *sk) 65{ 66 write_lock_bh(&dgram_lock); 67 if (sk_del_node_init(sk)) 68 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 69 write_unlock_bh(&dgram_lock); 70} 71 72static int dgram_init(struct sock *sk) 73{ 74 struct dgram_sock *ro = dgram_sk(sk); 75 76 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; 77 ro->dst_addr.pan_id = 0xffff; 78 ro->want_ack = 1; 79 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); 80 return 0; 81} 82 83static void dgram_close(struct sock *sk, long timeout) 84{ 85 sk_common_release(sk); 86} 87 88static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len) 89{ 90 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; 91 struct dgram_sock *ro = dgram_sk(sk); 92 int err = -EINVAL; 93 struct net_device *dev; 94 95 lock_sock(sk); 96 97 ro->bound = 0; 98 99 if (len < sizeof(*addr)) 100 goto out; 101 102 if (addr->family != AF_IEEE802154) 103 goto out; 104 105 dev = ieee802154_get_dev(sock_net(sk), &addr->addr); 106 if (!dev) { 107 err = -ENODEV; 108 goto out; 109 } 110 111 if (dev->type != ARPHRD_IEEE802154) { 112 err = -ENODEV; 113 goto out_put; 114 } 115 116 memcpy(&ro->src_addr, &addr->addr, sizeof(struct ieee802154_addr)); 117 118 ro->bound = 1; 119 err = 0; 120out_put: 121 dev_put(dev); 122out: 123 release_sock(sk); 124 125 return err; 126} 127 128static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg) 129{ 130 switch (cmd) { 131 case SIOCOUTQ: 132 { 133 int amount = sk_wmem_alloc_get(sk); 134 135 return put_user(amount, (int __user *)arg); 136 } 137 138 case SIOCINQ: 139 { 140 struct sk_buff *skb; 141 unsigned long amount; 142 143 amount = 0; 144 spin_lock_bh(&sk->sk_receive_queue.lock); 145 skb = skb_peek(&sk->sk_receive_queue); 146 if (skb != NULL) { 147 /* 148 * We will only return the amount 149 * of this packet since that is all 150 * that will be read. 151 */ 152 /* FIXME: parse the header for more correct value */ 153 amount = skb->len - (3+8+8); 154 } 155 spin_unlock_bh(&sk->sk_receive_queue.lock); 156 return put_user(amount, (int __user *)arg); 157 } 158 159 } 160 return -ENOIOCTLCMD; 161} 162 163/* FIXME: autobind */ 164static int dgram_connect(struct sock *sk, struct sockaddr *uaddr, 165 int len) 166{ 167 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; 168 struct dgram_sock *ro = dgram_sk(sk); 169 int err = 0; 170 171 if (len < sizeof(*addr)) 172 return -EINVAL; 173 174 if (addr->family != AF_IEEE802154) 175 return -EINVAL; 176 177 lock_sock(sk); 178 179 if (!ro->bound) { 180 err = -ENETUNREACH; 181 goto out; 182 } 183 184 memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr)); 185 186out: 187 release_sock(sk); 188 return err; 189} 190 191static int dgram_disconnect(struct sock *sk, int flags) 192{ 193 struct dgram_sock *ro = dgram_sk(sk); 194 195 lock_sock(sk); 196 197 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; 198 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); 199 200 release_sock(sk); 201 202 return 0; 203} 204 205static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, 206 struct msghdr *msg, size_t size) 207{ 208 struct net_device *dev; 209 unsigned int mtu; 210 struct sk_buff *skb; 211 struct dgram_sock *ro = dgram_sk(sk); 212 int hlen, tlen; 213 int err; 214 215 if (msg->msg_flags & MSG_OOB) { 216 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); 217 return -EOPNOTSUPP; 218 } 219 220 if (!ro->bound) 221 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); 222 else 223 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); 224 225 if (!dev) { 226 pr_debug("no dev\n"); 227 err = -ENXIO; 228 goto out; 229 } 230 mtu = dev->mtu; 231 pr_debug("name = %s, mtu = %u\n", dev->name, mtu); 232 233 if (size > mtu) { 234 pr_debug("size = %Zu, mtu = %u\n", size, mtu); 235 err = -EINVAL; 236 goto out_dev; 237 } 238 239 hlen = LL_RESERVED_SPACE(dev); 240 tlen = dev->needed_tailroom; 241 skb = sock_alloc_send_skb(sk, hlen + tlen + size, 242 msg->msg_flags & MSG_DONTWAIT, 243 &err); 244 if (!skb) 245 goto out_dev; 246 247 skb_reserve(skb, hlen); 248 249 skb_reset_network_header(skb); 250 251 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; 252 if (ro->want_ack) 253 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; 254 255 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); 256 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr, 257 ro->bound ? &ro->src_addr : NULL, size); 258 if (err < 0) 259 goto out_skb; 260 261 skb_reset_mac_header(skb); 262 263 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); 264 if (err < 0) 265 goto out_skb; 266 267 skb->dev = dev; 268 skb->sk = sk; 269 skb->protocol = htons(ETH_P_IEEE802154); 270 271 dev_put(dev); 272 273 err = dev_queue_xmit(skb); 274 if (err > 0) 275 err = net_xmit_errno(err); 276 277 return err ?: size; 278 279out_skb: 280 kfree_skb(skb); 281out_dev: 282 dev_put(dev); 283out: 284 return err; 285} 286 287static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, 288 struct msghdr *msg, size_t len, int noblock, int flags, 289 int *addr_len) 290{ 291 size_t copied = 0; 292 int err = -EOPNOTSUPP; 293 struct sk_buff *skb; 294 295 skb = skb_recv_datagram(sk, flags, noblock, &err); 296 if (!skb) 297 goto out; 298 299 copied = skb->len; 300 if (len < copied) { 301 msg->msg_flags |= MSG_TRUNC; 302 copied = len; 303 } 304 305 /* FIXME: skip headers if necessary ?! */ 306 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 307 if (err) 308 goto done; 309 310 sock_recv_ts_and_drops(msg, sk, skb); 311 312 if (flags & MSG_TRUNC) 313 copied = skb->len; 314done: 315 skb_free_datagram(sk, skb); 316out: 317 if (err) 318 return err; 319 return copied; 320} 321 322static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) 323{ 324 if (sock_queue_rcv_skb(sk, skb) < 0) { 325 kfree_skb(skb); 326 return NET_RX_DROP; 327 } 328 329 return NET_RX_SUCCESS; 330} 331 332static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id, 333 u16 short_addr, struct dgram_sock *ro) 334{ 335 if (!ro->bound) 336 return 1; 337 338 if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG && 339 !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN)) 340 return 1; 341 342 if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT && 343 pan_id == ro->src_addr.pan_id && 344 short_addr == ro->src_addr.short_addr) 345 return 1; 346 347 return 0; 348} 349 350int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) 351{ 352 struct sock *sk, *prev = NULL; 353 int ret = NET_RX_SUCCESS; 354 u16 pan_id, short_addr; 355 356 /* Data frame processing */ 357 BUG_ON(dev->type != ARPHRD_IEEE802154); 358 359 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); 360 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); 361 362 read_lock(&dgram_lock); 363 sk_for_each(sk, &dgram_head) { 364 if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr, 365 dgram_sk(sk))) { 366 if (prev) { 367 struct sk_buff *clone; 368 clone = skb_clone(skb, GFP_ATOMIC); 369 if (clone) 370 dgram_rcv_skb(prev, clone); 371 } 372 373 prev = sk; 374 } 375 } 376 377 if (prev) 378 dgram_rcv_skb(prev, skb); 379 else { 380 kfree_skb(skb); 381 ret = NET_RX_DROP; 382 } 383 read_unlock(&dgram_lock); 384 385 return ret; 386} 387 388static int dgram_getsockopt(struct sock *sk, int level, int optname, 389 char __user *optval, int __user *optlen) 390{ 391 struct dgram_sock *ro = dgram_sk(sk); 392 393 int val, len; 394 395 if (level != SOL_IEEE802154) 396 return -EOPNOTSUPP; 397 398 if (get_user(len, optlen)) 399 return -EFAULT; 400 401 len = min_t(unsigned int, len, sizeof(int)); 402 403 switch (optname) { 404 case WPAN_WANTACK: 405 val = ro->want_ack; 406 break; 407 default: 408 return -ENOPROTOOPT; 409 } 410 411 if (put_user(len, optlen)) 412 return -EFAULT; 413 if (copy_to_user(optval, &val, len)) 414 return -EFAULT; 415 return 0; 416} 417 418static int dgram_setsockopt(struct sock *sk, int level, int optname, 419 char __user *optval, unsigned int optlen) 420{ 421 struct dgram_sock *ro = dgram_sk(sk); 422 int val; 423 int err = 0; 424 425 if (optlen < sizeof(int)) 426 return -EINVAL; 427 428 if (get_user(val, (int __user *)optval)) 429 return -EFAULT; 430 431 lock_sock(sk); 432 433 switch (optname) { 434 case WPAN_WANTACK: 435 ro->want_ack = !!val; 436 break; 437 default: 438 err = -ENOPROTOOPT; 439 break; 440 } 441 442 release_sock(sk); 443 return err; 444} 445 446struct proto ieee802154_dgram_prot = { 447 .name = "IEEE-802.15.4-MAC", 448 .owner = THIS_MODULE, 449 .obj_size = sizeof(struct dgram_sock), 450 .init = dgram_init, 451 .close = dgram_close, 452 .bind = dgram_bind, 453 .sendmsg = dgram_sendmsg, 454 .recvmsg = dgram_recvmsg, 455 .hash = dgram_hash, 456 .unhash = dgram_unhash, 457 .connect = dgram_connect, 458 .disconnect = dgram_disconnect, 459 .ioctl = dgram_ioctl, 460 .getsockopt = dgram_getsockopt, 461 .setsockopt = dgram_setsockopt, 462}; 463 464