net/ieee802154/raw.c

   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
  34 static HLIST_HEAD(raw_head);
  35 static DEFINE_RWLOCK(raw_lock);
  36
  37 static 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
  45 static 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
  53 static void raw_close(struct sock *sk, long timeout)
  54 {
  55         sk_common_release(sk);
  56 }
  57
  58 static 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
  86 out_put:
  87         dev_put(dev);
  88 out:
  89         release_sock(sk);
  90
  91         return err;
  92 }
  93
  94 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
  95                         int addr_len)
  96 {
  97         return -ENOTSUPP;
  98 }
  99
 100 static int raw_disconnect(struct sock *sk, int flags)
 101 {
 102         return 0;
 103 }
 104
 105 static 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
 169 out_skb:
 170         kfree_skb(skb);
 171 out_dev:
 172         dev_put(dev);
 173 out:
 174         return err;
 175 }
 176
 177 static 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;
 202 done:
 203         skb_free_datagram(sk, skb);
 204 out:
 205         if (err)
 206                 return err;
 207         return copied;
 208 }
 209
 210 static 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
 221 void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 222 {
 223         struct sock *sk;
 224
 225         read_lock(&raw_lock);
 226         sk_for_each(sk, &raw_head) {
 227                 bh_lock_sock(sk);
 228                 if (!sk->sk_bound_dev_if ||
 229                     sk->sk_bound_dev_if == dev->ifindex) {
 230
 231                         struct sk_buff *clone;
 232
 233                         clone = skb_clone(skb, GFP_ATOMIC);
 234                         if (clone)
 235                                 raw_rcv_skb(sk, clone);
 236                 }
 237                 bh_unlock_sock(sk);
 238         }
 239         read_unlock(&raw_lock);
 240 }
 241
 242 static int raw_getsockopt(struct sock *sk, int level, int optname,
 243                     char __user *optval, int __user *optlen)
 244 {
 245         return -EOPNOTSUPP;
 246 }
 247
 248 static int raw_setsockopt(struct sock *sk, int level, int optname,
 249                     char __user *optval, unsigned int optlen)
 250 {
 251         return -EOPNOTSUPP;
 252 }
 253
 254 struct proto ieee802154_raw_prot = {
 255         .name           = "IEEE-802.15.4-RAW",
 256         .owner          = THIS_MODULE,
 257         .obj_size       = sizeof(struct sock),
 258         .close          = raw_close,
 259         .bind           = raw_bind,
 260         .sendmsg        = raw_sendmsg,
 261         .recvmsg        = raw_recvmsg,
 262         .hash           = raw_hash,
 263         .unhash         = raw_unhash,
 264         .connect        = raw_connect,
 265         .disconnect     = raw_disconnect,
 266         .getsockopt     = raw_getsockopt,
 267         .setsockopt     = raw_setsockopt,
 268 };
 269