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 #include <net/ieee802154_netdev.h>
  32
  33 #include "af802154.h"
  34
  35 static HLIST_HEAD(raw_head);
  36 static DEFINE_RWLOCK(raw_lock);
  37
  38 static void raw_hash(struct sock *sk)
  39 {
  40         write_lock_bh(&raw_lock);
  41         sk_add_node(sk, &raw_head);
  42         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  43         write_unlock_bh(&raw_lock);
  44 }
  45
  46 static void raw_unhash(struct sock *sk)
  47 {
  48         write_lock_bh(&raw_lock);
  49         if (sk_del_node_init(sk))
  50                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  51         write_unlock_bh(&raw_lock);
  52 }
  53
  54 static void raw_close(struct sock *sk, long timeout)
  55 {
  56         sk_common_release(sk);
  57 }
  58
  59 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
  60 {
  61         struct ieee802154_addr addr;
  62         struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
  63         int err = 0;
  64         struct net_device *dev = NULL;
  65
  66         if (len < sizeof(*uaddr))
  67                 return -EINVAL;
  68
  69         uaddr = (struct sockaddr_ieee802154 *)_uaddr;
  70         if (uaddr->family != AF_IEEE802154)
  71                 return -EINVAL;
  72
  73         lock_sock(sk);
  74
  75         ieee802154_addr_from_sa(&addr, &uaddr->addr);
  76         dev = ieee802154_get_dev(sock_net(sk), &addr);
  77         if (!dev) {
  78                 err = -ENODEV;
  79                 goto out;
  80         }
  81
  82         if (dev->type != ARPHRD_IEEE802154) {
  83                 err = -ENODEV;
  84                 goto out_put;
  85         }
  86
  87         sk->sk_bound_dev_if = dev->ifindex;
  88         sk_dst_reset(sk);
  89
  90 out_put:
  91         dev_put(dev);
  92 out:
  93         release_sock(sk);
  94
  95         return err;
  96 }
  97
  98 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
  99                         int addr_len)
 100 {
 101         return -ENOTSUPP;
 102 }
 103
 104 static int raw_disconnect(struct sock *sk, int flags)
 105 {
 106         return 0;
 107 }
 108
 109 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 110                        size_t size)
 111 {
 112         struct net_device *dev;
 113         unsigned int mtu;
 114         struct sk_buff *skb;
 115         int hlen, tlen;
 116         int err;
 117
 118         if (msg->msg_flags & MSG_OOB) {
 119                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 120                 return -EOPNOTSUPP;
 121         }
 122
 123         lock_sock(sk);
 124         if (!sk->sk_bound_dev_if)
 125                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 126         else
 127                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 128         release_sock(sk);
 129
 130         if (!dev) {
 131                 pr_debug("no dev\n");
 132                 err = -ENXIO;
 133                 goto out;
 134         }
 135
 136         mtu = dev->mtu;
 137         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 138
 139         if (size > mtu) {
 140                 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
 141                 err = -EINVAL;
 142                 goto out_dev;
 143         }
 144
 145         hlen = LL_RESERVED_SPACE(dev);
 146         tlen = dev->needed_tailroom;
 147         skb = sock_alloc_send_skb(sk, hlen + tlen + size,
 148                         msg->msg_flags & MSG_DONTWAIT, &err);
 149         if (!skb)
 150                 goto out_dev;
 151
 152         skb_reserve(skb, hlen);
 153
 154         skb_reset_mac_header(skb);
 155         skb_reset_network_header(skb);
 156
 157         err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 158         if (err < 0)
 159                 goto out_skb;
 160
 161         skb->dev = dev;
 162         skb->sk  = sk;
 163         skb->protocol = htons(ETH_P_IEEE802154);
 164
 165         dev_put(dev);
 166
 167         err = dev_queue_xmit(skb);
 168         if (err > 0)
 169                 err = net_xmit_errno(err);
 170
 171         return err ?: size;
 172
 173 out_skb:
 174         kfree_skb(skb);
 175 out_dev:
 176         dev_put(dev);
 177 out:
 178         return err;
 179 }
 180
 181 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 182                        size_t len, int noblock, int flags, int *addr_len)
 183 {
 184         size_t copied = 0;
 185         int err = -EOPNOTSUPP;
 186         struct sk_buff *skb;
 187
 188         skb = skb_recv_datagram(sk, flags, noblock, &err);
 189         if (!skb)
 190                 goto out;
 191
 192         copied = skb->len;
 193         if (len < copied) {
 194                 msg->msg_flags |= MSG_TRUNC;
 195                 copied = len;
 196         }
 197
 198         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 199         if (err)
 200                 goto done;
 201
 202         sock_recv_ts_and_drops(msg, sk, skb);
 203
 204         if (flags & MSG_TRUNC)
 205                 copied = skb->len;
 206 done:
 207         skb_free_datagram(sk, skb);
 208 out:
 209         if (err)
 210                 return err;
 211         return copied;
 212 }
 213
 214 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 215 {
 216         skb = skb_share_check(skb, GFP_ATOMIC);
 217         if (!skb)
 218                 return NET_RX_DROP;
 219
 220         if (sock_queue_rcv_skb(sk, skb) < 0) {
 221                 kfree_skb(skb);
 222                 return NET_RX_DROP;
 223         }
 224
 225         return NET_RX_SUCCESS;
 226 }
 227
 228
 229 void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 230 {
 231         struct sock *sk;
 232
 233         read_lock(&raw_lock);
 234         sk_for_each(sk, &raw_head) {
 235                 bh_lock_sock(sk);
 236                 if (!sk->sk_bound_dev_if ||
 237                     sk->sk_bound_dev_if == dev->ifindex) {
 238
 239                         struct sk_buff *clone;
 240
 241                         clone = skb_clone(skb, GFP_ATOMIC);
 242                         if (clone)
 243                                 raw_rcv_skb(sk, clone);
 244                 }
 245                 bh_unlock_sock(sk);
 246         }
 247         read_unlock(&raw_lock);
 248 }
 249
 250 static int raw_getsockopt(struct sock *sk, int level, int optname,
 251                     char __user *optval, int __user *optlen)
 252 {
 253         return -EOPNOTSUPP;
 254 }
 255
 256 static int raw_setsockopt(struct sock *sk, int level, int optname,
 257                     char __user *optval, unsigned int optlen)
 258 {
 259         return -EOPNOTSUPP;
 260 }
 261
 262 struct proto ieee802154_raw_prot = {
 263         .name           = "IEEE-802.15.4-RAW",
 264         .owner          = THIS_MODULE,
 265         .obj_size       = sizeof(struct sock),
 266         .close          = raw_close,
 267         .bind           = raw_bind,
 268         .sendmsg        = raw_sendmsg,
 269         .recvmsg        = raw_recvmsg,
 270         .hash           = raw_hash,
 271         .unhash         = raw_unhash,
 272         .connect        = raw_connect,
 273         .disconnect     = raw_disconnect,
 274         .getsockopt     = raw_getsockopt,
 275         .setsockopt     = raw_setsockopt,
 276 };
 277