net/ieee802154/dgram.c

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