linux/net/ieee802154/raw.c
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   1/*
   2 * Raw IEEE 802.15.4 sockets
   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
  32#include "af802154.h"
  33
  34static HLIST_HEAD(raw_head);
  35static DEFINE_RWLOCK(raw_lock);
  36
  37static void raw_hash(struct sock *sk)
  38{
  39        write_lock_bh(&raw_lock);
  40        sk_add_node(sk, &raw_head);
  41        sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  42        write_unlock_bh(&raw_lock);
  43}
  44
  45static void raw_unhash(struct sock *sk)
  46{
  47        write_lock_bh(&raw_lock);
  48        if (sk_del_node_init(sk))
  49                sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  50        write_unlock_bh(&raw_lock);
  51}
  52
  53static void raw_close(struct sock *sk, long timeout)
  54{
  55        sk_common_release(sk);
  56}
  57
  58static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int len)
  59{
  60        struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
  61        int err = 0;
  62        struct net_device *dev = NULL;
  63
  64        if (len < sizeof(*addr))
  65                return -EINVAL;
  66
  67        if (addr->family != AF_IEEE802154)
  68                return -EINVAL;
  69
  70        lock_sock(sk);
  71
  72        dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
  73        if (!dev) {
  74                err = -ENODEV;
  75                goto out;
  76        }
  77
  78        if (dev->type != ARPHRD_IEEE802154) {
  79                err = -ENODEV;
  80                goto out_put;
  81        }
  82
  83        sk->sk_bound_dev_if = dev->ifindex;
  84        sk_dst_reset(sk);
  85
  86out_put:
  87        dev_put(dev);
  88out:
  89        release_sock(sk);
  90
  91        return err;
  92}
  93
  94static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
  95                        int addr_len)
  96{
  97        return -ENOTSUPP;
  98}
  99
 100static int raw_disconnect(struct sock *sk, int flags)
 101{
 102        return 0;
 103}
 104
 105static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 106                       size_t size)
 107{
 108        struct net_device *dev;
 109        unsigned int mtu;
 110        struct sk_buff *skb;
 111        int hlen, tlen;
 112        int err;
 113
 114        if (msg->msg_flags & MSG_OOB) {
 115                pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 116                return -EOPNOTSUPP;
 117        }
 118
 119        lock_sock(sk);
 120        if (!sk->sk_bound_dev_if)
 121                dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 122        else
 123                dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 124        release_sock(sk);
 125
 126        if (!dev) {
 127                pr_debug("no dev\n");
 128                err = -ENXIO;
 129                goto out;
 130        }
 131
 132        mtu = dev->mtu;
 133        pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 134
 135        if (size > mtu) {
 136                pr_debug("size = %Zu, mtu = %u\n", size, mtu);
 137                err = -EINVAL;
 138                goto out_dev;
 139        }
 140
 141        hlen = LL_RESERVED_SPACE(dev);
 142        tlen = dev->needed_tailroom;
 143        skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 144                        msg->msg_flags & MSG_DONTWAIT, &err);
 145        if (!skb)
 146                goto out_dev;
 147
 148        skb_reserve(skb, hlen);
 149
 150        skb_reset_mac_header(skb);
 151        skb_reset_network_header(skb);
 152
 153        err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 154        if (err < 0)
 155                goto out_skb;
 156
 157        skb->dev = dev;
 158        skb->sk  = sk;
 159        skb->protocol = htons(ETH_P_IEEE802154);
 160
 161        dev_put(dev);
 162
 163        err = dev_queue_xmit(skb);
 164        if (err > 0)
 165                err = net_xmit_errno(err);
 166
 167        return err ?: size;
 168
 169out_skb:
 170        kfree_skb(skb);
 171out_dev:
 172        dev_put(dev);
 173out:
 174        return err;
 175}
 176
 177static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 178                       size_t len, int noblock, int flags, int *addr_len)
 179{
 180        size_t copied = 0;
 181        int err = -EOPNOTSUPP;
 182        struct sk_buff *skb;
 183
 184        skb = skb_recv_datagram(sk, flags, noblock, &err);
 185        if (!skb)
 186                goto out;
 187
 188        copied = skb->len;
 189        if (len < copied) {
 190                msg->msg_flags |= MSG_TRUNC;
 191                copied = len;
 192        }
 193
 194        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 195        if (err)
 196                goto done;
 197
 198        sock_recv_ts_and_drops(msg, sk, skb);
 199
 200        if (flags & MSG_TRUNC)
 201                copied = skb->len;
 202done:
 203        skb_free_datagram(sk, skb);
 204out:
 205        if (err)
 206                return err;
 207        return copied;
 208}
 209
 210static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 211{
 212        if (sock_queue_rcv_skb(sk, skb) < 0) {
 213                kfree_skb(skb);
 214                return NET_RX_DROP;
 215        }
 216
 217        return NET_RX_SUCCESS;
 218}
 219
 220
 221void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 222{
 223        struct sock *sk;
 224        struct hlist_node *node;
 225
 226        read_lock(&raw_lock);
 227        sk_for_each(sk, node, &raw_head) {
 228                bh_lock_sock(sk);
 229                if (!sk->sk_bound_dev_if ||
 230                    sk->sk_bound_dev_if == dev->ifindex) {
 231
 232                        struct sk_buff *clone;
 233
 234                        clone = skb_clone(skb, GFP_ATOMIC);
 235                        if (clone)
 236                                raw_rcv_skb(sk, clone);
 237                }
 238                bh_unlock_sock(sk);
 239        }
 240        read_unlock(&raw_lock);
 241}
 242
 243static int raw_getsockopt(struct sock *sk, int level, int optname,
 244                    char __user *optval, int __user *optlen)
 245{
 246        return -EOPNOTSUPP;
 247}
 248
 249static int raw_setsockopt(struct sock *sk, int level, int optname,
 250                    char __user *optval, unsigned int optlen)
 251{
 252        return -EOPNOTSUPP;
 253}
 254
 255struct proto ieee802154_raw_prot = {
 256        .name           = "IEEE-802.15.4-RAW",
 257        .owner          = THIS_MODULE,
 258        .obj_size       = sizeof(struct sock),
 259        .close          = raw_close,
 260        .bind           = raw_bind,
 261        .sendmsg        = raw_sendmsg,
 262        .recvmsg        = raw_recvmsg,
 263        .hash           = raw_hash,
 264        .unhash         = raw_unhash,
 265        .connect        = raw_connect,
 266        .disconnect     = raw_disconnect,
 267        .getsockopt     = raw_getsockopt,
 268        .setsockopt     = raw_setsockopt,
 269};
 270
 271
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