1/* 2 * ZigBee 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 bound:1; 48 unsigned 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 amount = skb->len - (3+8+8); 153 } 154 spin_unlock_bh(&sk->sk_receive_queue.lock); 155 return put_user(amount, (int __user *)arg); 156 } 157 158 } 159 return -ENOIOCTLCMD; 160} 161 162static int dgram_connect(struct sock *sk, struct sockaddr *uaddr, 163 int len) 164{ 165 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr; 166 struct dgram_sock *ro = dgram_sk(sk); 167 int err = 0; 168 169 if (len < sizeof(*addr)) 170 return -EINVAL; 171 172 if (addr->family != AF_IEEE802154) 173 return -EINVAL; 174 175 lock_sock(sk); 176 177 if (!ro->bound) { 178 err = -ENETUNREACH; 179 goto out; 180 } 181 182 memcpy(&ro->dst_addr, &addr->addr, sizeof(struct ieee802154_addr)); 183 184out: 185 release_sock(sk); 186 return err; 187} 188 189static int dgram_disconnect(struct sock *sk, int flags) 190{ 191 struct dgram_sock *ro = dgram_sk(sk); 192 193 lock_sock(sk); 194 195 ro->dst_addr.addr_type = IEEE802154_ADDR_LONG; 196 memset(&ro->dst_addr.hwaddr, 0xff, sizeof(ro->dst_addr.hwaddr)); 197 198 release_sock(sk); 199 200 return 0; 201} 202 203static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, 204 struct msghdr *msg, size_t size) 205{ 206 struct net_device *dev; 207 unsigned mtu; 208 struct sk_buff *skb; 209 struct dgram_sock *ro = dgram_sk(sk); 210 int err; 211 212 if (msg->msg_flags & MSG_OOB) { 213 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags); 214 return -EOPNOTSUPP; 215 } 216 217 if (!ro->bound) 218 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154); 219 else 220 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr); 221 222 if (!dev) { 223 pr_debug("no dev\n"); 224 err = -ENXIO; 225 goto out; 226 } 227 mtu = dev->mtu; 228 pr_debug("name = %s, mtu = %u\n", dev->name, mtu); 229 230 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size, 231 msg->msg_flags & MSG_DONTWAIT, 232 &err); 233 if (!skb) 234 goto out_dev; 235 236 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 237 238 skb_reset_network_header(skb); 239 240 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA; 241 if (ro->want_ack) 242 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ; 243 244 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev); 245 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr, 246 ro->bound ? &ro->src_addr : NULL, size); 247 if (err < 0) 248 goto out_skb; 249 250 skb_reset_mac_header(skb); 251 252 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); 253 if (err < 0) 254 goto out_skb; 255 256 if (size > mtu) { 257 pr_debug("size = %Zu, mtu = %u\n", size, mtu); 258 err = -EINVAL; 259 goto out_skb; 260 } 261 262 skb->dev = dev; 263 skb->sk = sk; 264 skb->protocol = htons(ETH_P_IEEE802154); 265 266 dev_put(dev); 267 268 err = dev_queue_xmit(skb); 269 if (err > 0) 270 err = net_xmit_errno(err); 271 272 return err ?: size; 273 274out_skb: 275 kfree_skb(skb); 276out_dev: 277 dev_put(dev); 278out: 279 return err; 280} 281 282static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk, 283 struct msghdr *msg, size_t len, int noblock, int flags, 284 int *addr_len) 285{ 286 size_t copied = 0; 287 int err = -EOPNOTSUPP; 288 struct sk_buff *skb; 289 290 skb = skb_recv_datagram(sk, flags, noblock, &err); 291 if (!skb) 292 goto out; 293 294 copied = skb->len; 295 if (len < copied) { 296 msg->msg_flags |= MSG_TRUNC; 297 copied = len; 298 } 299 300 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 301 if (err) 302 goto done; 303 304 sock_recv_ts_and_drops(msg, sk, skb); 305 306 if (flags & MSG_TRUNC) 307 copied = skb->len; 308done: 309 skb_free_datagram(sk, skb); 310out: 311 if (err) 312 return err; 313 return copied; 314} 315 316static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb) 317{ 318 if (sock_queue_rcv_skb(sk, skb) < 0) { 319 kfree_skb(skb); 320 return NET_RX_DROP; 321 } 322 323 return NET_RX_SUCCESS; 324} 325 326static inline int ieee802154_match_sock(u8 *hw_addr, u16 pan_id, 327 u16 short_addr, struct dgram_sock *ro) 328{ 329 if (!ro->bound) 330 return 1; 331 332 if (ro->src_addr.addr_type == IEEE802154_ADDR_LONG && 333 !memcmp(ro->src_addr.hwaddr, hw_addr, IEEE802154_ADDR_LEN)) 334 return 1; 335 336 if (ro->src_addr.addr_type == IEEE802154_ADDR_SHORT && 337 pan_id == ro->src_addr.pan_id && 338 short_addr == ro->src_addr.short_addr) 339 return 1; 340 341 return 0; 342} 343 344int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb) 345{ 346 struct sock *sk, *prev = NULL; 347 struct hlist_node *node; 348 int ret = NET_RX_SUCCESS; 349 u16 pan_id, short_addr; 350 351 /* Data frame processing */ 352 BUG_ON(dev->type != ARPHRD_IEEE802154); 353 354 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev); 355 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev); 356 357 read_lock(&dgram_lock); 358 sk_for_each(sk, node, &dgram_head) { 359 if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr, 360 dgram_sk(sk))) { 361 if (prev) { 362 struct sk_buff *clone; 363 clone = skb_clone(skb, GFP_ATOMIC); 364 if (clone) 365 dgram_rcv_skb(prev, clone); 366 } 367 368 prev = sk; 369 } 370 } 371 372 if (prev) 373 dgram_rcv_skb(prev, skb); 374 else { 375 kfree_skb(skb); 376 ret = NET_RX_DROP; 377 } 378 read_unlock(&dgram_lock); 379 380 return ret; 381} 382 383static int dgram_getsockopt(struct sock *sk, int level, int optname, 384 char __user *optval, int __user *optlen) 385{ 386 struct dgram_sock *ro = dgram_sk(sk); 387 388 int val, len; 389 390 if (level != SOL_IEEE802154) 391 return -EOPNOTSUPP; 392 393 if (get_user(len, optlen)) 394 return -EFAULT; 395 396 len = min_t(unsigned int, len, sizeof(int)); 397 398 switch (optname) { 399 case WPAN_WANTACK: 400 val = ro->want_ack; 401 break; 402 default: 403 return -ENOPROTOOPT; 404 } 405 406 if (put_user(len, optlen)) 407 return -EFAULT; 408 if (copy_to_user(optval, &val, len)) 409 return -EFAULT; 410 return 0; 411} 412 413static int dgram_setsockopt(struct sock *sk, int level, int optname, 414 char __user *optval, unsigned int optlen) 415{ 416 struct dgram_sock *ro = dgram_sk(sk); 417 int val; 418 int err = 0; 419 420 if (optlen < sizeof(int)) 421 return -EINVAL; 422 423 if (get_user(val, (int __user *)optval)) 424 return -EFAULT; 425 426 lock_sock(sk); 427 428 switch (optname) { 429 case WPAN_WANTACK: 430 ro->want_ack = !!val; 431 break; 432 default: 433 err = -ENOPROTOOPT; 434 break; 435 } 436 437 release_sock(sk); 438 return err; 439} 440 441struct proto ieee802154_dgram_prot = { 442 .name = "IEEE-802.15.4-MAC", 443 .owner = THIS_MODULE, 444 .obj_size = sizeof(struct dgram_sock), 445 .init = dgram_init, 446 .close = dgram_close, 447 .bind = dgram_bind, 448 .sendmsg = dgram_sendmsg, 449 .recvmsg = dgram_recvmsg, 450 .hash = dgram_hash, 451 .unhash = dgram_unhash, 452 .connect = dgram_connect, 453 .disconnect = dgram_disconnect, 454 .ioctl = dgram_ioctl, 455 .getsockopt = dgram_getsockopt, 456 .setsockopt = dgram_setsockopt, 457}; 458