linux/net/ieee802154/dgram.c
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   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        struct hlist_node *node;
 354        int ret = NET_RX_SUCCESS;
 355        u16 pan_id, short_addr;
 356
 357        /* Data frame processing */
 358        BUG_ON(dev->type != ARPHRD_IEEE802154);
 359
 360        pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
 361        short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
 362
 363        read_lock(&dgram_lock);
 364        sk_for_each(sk, node, &dgram_head) {
 365                if (ieee802154_match_sock(dev->dev_addr, pan_id, short_addr,
 366                                        dgram_sk(sk))) {
 367                        if (prev) {
 368                                struct sk_buff *clone;
 369                                clone = skb_clone(skb, GFP_ATOMIC);
 370                                if (clone)
 371                                        dgram_rcv_skb(prev, clone);
 372                        }
 373
 374                        prev = sk;
 375                }
 376        }
 377
 378        if (prev)
 379                dgram_rcv_skb(prev, skb);
 380        else {
 381                kfree_skb(skb);
 382                ret = NET_RX_DROP;
 383        }
 384        read_unlock(&dgram_lock);
 385
 386        return ret;
 387}
 388
 389static int dgram_getsockopt(struct sock *sk, int level, int optname,
 390                    char __user *optval, int __user *optlen)
 391{
 392        struct dgram_sock *ro = dgram_sk(sk);
 393
 394        int val, len;
 395
 396        if (level != SOL_IEEE802154)
 397                return -EOPNOTSUPP;
 398
 399        if (get_user(len, optlen))
 400                return -EFAULT;
 401
 402        len = min_t(unsigned int, len, sizeof(int));
 403
 404        switch (optname) {
 405        case WPAN_WANTACK:
 406                val = ro->want_ack;
 407                break;
 408        default:
 409                return -ENOPROTOOPT;
 410        }
 411
 412        if (put_user(len, optlen))
 413                return -EFAULT;
 414        if (copy_to_user(optval, &val, len))
 415                return -EFAULT;
 416        return 0;
 417}
 418
 419static int dgram_setsockopt(struct sock *sk, int level, int optname,
 420                    char __user *optval, unsigned int optlen)
 421{
 422        struct dgram_sock *ro = dgram_sk(sk);
 423        int val;
 424        int err = 0;
 425
 426        if (optlen < sizeof(int))
 427                return -EINVAL;
 428
 429        if (get_user(val, (int __user *)optval))
 430                return -EFAULT;
 431
 432        lock_sock(sk);
 433
 434        switch (optname) {
 435        case WPAN_WANTACK:
 436                ro->want_ack = !!val;
 437                break;
 438        default:
 439                err = -ENOPROTOOPT;
 440                break;
 441        }
 442
 443        release_sock(sk);
 444        return err;
 445}
 446
 447struct proto ieee802154_dgram_prot = {
 448        .name           = "IEEE-802.15.4-MAC",
 449        .owner          = THIS_MODULE,
 450        .obj_size       = sizeof(struct dgram_sock),
 451        .init           = dgram_init,
 452        .close          = dgram_close,
 453        .bind           = dgram_bind,
 454        .sendmsg        = dgram_sendmsg,
 455        .recvmsg        = dgram_recvmsg,
 456        .hash           = dgram_hash,
 457        .unhash         = dgram_unhash,
 458        .connect        = dgram_connect,
 459        .disconnect     = dgram_disconnect,
 460        .ioctl          = dgram_ioctl,
 461        .getsockopt     = dgram_getsockopt,
 462        .setsockopt     = dgram_setsockopt,
 463};
 464
 465
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