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 <net/sock.h>
  29 #include <net/af_ieee802154.h>
  30
  31 #include "af802154.h"
  32
  33 static HLIST_HEAD(raw_head);
  34 static DEFINE_RWLOCK(raw_lock);
  35
  36 static void raw_hash(struct sock *sk)
  37 {
  38         write_lock_bh(&raw_lock);
  39         sk_add_node(sk, &raw_head);
  40         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  41         write_unlock_bh(&raw_lock);
  42 }
  43
  44 static void raw_unhash(struct sock *sk)
  45 {
  46         write_lock_bh(&raw_lock);
  47         if (sk_del_node_init(sk))
  48                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  49         write_unlock_bh(&raw_lock);
  50 }
  51
  52 static void raw_close(struct sock *sk, long timeout)
  53 {
  54         sk_common_release(sk);
  55 }
  56
  57 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int len)
  58 {
  59         struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
  60         int err = 0;
  61         struct net_device *dev = NULL;
  62
  63         if (len < sizeof(*addr))
  64                 return -EINVAL;
  65
  66         if (addr->family != AF_IEEE802154)
  67                 return -EINVAL;
  68
  69         lock_sock(sk);
  70
  71         dev = ieee802154_get_dev(sock_net(sk), &addr->addr);
  72         if (!dev) {
  73                 err = -ENODEV;
  74                 goto out;
  75         }
  76
  77         if (dev->type != ARPHRD_IEEE802154) {
  78                 err = -ENODEV;
  79                 goto out_put;
  80         }
  81
  82         sk->sk_bound_dev_if = dev->ifindex;
  83         sk_dst_reset(sk);
  84
  85 out_put:
  86         dev_put(dev);
  87 out:
  88         release_sock(sk);
  89
  90         return err;
  91 }
  92
  93 static int raw_connect(struct sock *sk, struct sockaddr *uaddr,
  94                         int addr_len)
  95 {
  96         return -ENOTSUPP;
  97 }
  98
  99 static int raw_disconnect(struct sock *sk, int flags)
 100 {
 101         return 0;
 102 }
 103
 104 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 105                        size_t size)
 106 {
 107         struct net_device *dev;
 108         unsigned mtu;
 109         struct sk_buff *skb;
 110         int err;
 111
 112         if (msg->msg_flags & MSG_OOB) {
 113                 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
 114                 return -EOPNOTSUPP;
 115         }
 116
 117         lock_sock(sk);
 118         if (!sk->sk_bound_dev_if)
 119                 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
 120         else
 121                 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
 122         release_sock(sk);
 123
 124         if (!dev) {
 125                 pr_debug("no dev\n");
 126                 err = -ENXIO;
 127                 goto out;
 128         }
 129
 130         mtu = dev->mtu;
 131         pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
 132
 133         if (size > mtu) {
 134                 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
 135                 err = -EINVAL;
 136                 goto out_dev;
 137         }
 138
 139         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
 140                         msg->msg_flags & MSG_DONTWAIT, &err);
 141         if (!skb)
 142                 goto out_dev;
 143
 144         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 145
 146         skb_reset_mac_header(skb);
 147         skb_reset_network_header(skb);
 148
 149         err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 150         if (err < 0)
 151                 goto out_skb;
 152
 153         skb->dev = dev;
 154         skb->sk  = sk;
 155         skb->protocol = htons(ETH_P_IEEE802154);
 156
 157         dev_put(dev);
 158
 159         err = dev_queue_xmit(skb);
 160         if (err > 0)
 161                 err = net_xmit_errno(err);
 162
 163         return err ?: size;
 164
 165 out_skb:
 166         kfree_skb(skb);
 167 out_dev:
 168         dev_put(dev);
 169 out:
 170         return err;
 171 }
 172
 173 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 174                        size_t len, int noblock, int flags, int *addr_len)
 175 {
 176         size_t copied = 0;
 177         int err = -EOPNOTSUPP;
 178         struct sk_buff *skb;
 179
 180         skb = skb_recv_datagram(sk, flags, noblock, &err);
 181         if (!skb)
 182                 goto out;
 183
 184         copied = skb->len;
 185         if (len < copied) {
 186                 msg->msg_flags |= MSG_TRUNC;
 187                 copied = len;
 188         }
 189
 190         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 191         if (err)
 192                 goto done;
 193
 194         sock_recv_timestamp(msg, sk, skb);
 195
 196         if (flags & MSG_TRUNC)
 197                 copied = skb->len;
 198 done:
 199         skb_free_datagram(sk, skb);
 200 out:
 201         if (err)
 202                 return err;
 203         return copied;
 204 }
 205
 206 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 207 {
 208         if (sock_queue_rcv_skb(sk, skb) < 0) {
 209                 atomic_inc(&sk->sk_drops);
 210                 kfree_skb(skb);
 211                 return NET_RX_DROP;
 212         }
 213
 214         return NET_RX_SUCCESS;
 215 }
 216
 217
 218 void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 219 {
 220         struct sock *sk;
 221         struct hlist_node *node;
 222
 223         read_lock(&raw_lock);
 224         sk_for_each(sk, node, &raw_head) {
 225                 bh_lock_sock(sk);
 226                 if (!sk->sk_bound_dev_if ||
 227                     sk->sk_bound_dev_if == dev->ifindex) {
 228
 229                         struct sk_buff *clone;
 230
 231                         clone = skb_clone(skb, GFP_ATOMIC);
 232                         if (clone)
 233                                 raw_rcv_skb(sk, clone);
 234                 }
 235                 bh_unlock_sock(sk);
 236         }
 237         read_unlock(&raw_lock);
 238 }
 239
 240 static int raw_getsockopt(struct sock *sk, int level, int optname,
 241                     char __user *optval, int __user *optlen)
 242 {
 243         return -EOPNOTSUPP;
 244 }
 245
 246 static int raw_setsockopt(struct sock *sk, int level, int optname,
 247                     char __user *optval, int __user optlen)
 248 {
 249         return -EOPNOTSUPP;
 250 }
 251
 252 struct proto ieee802154_raw_prot = {
 253         .name           = "IEEE-802.15.4-RAW",
 254         .owner          = THIS_MODULE,
 255         .obj_size       = sizeof(struct sock),
 256         .close          = raw_close,
 257         .bind           = raw_bind,
 258         .sendmsg        = raw_sendmsg,
 259         .recvmsg        = raw_recvmsg,
 260         .hash           = raw_hash,
 261         .unhash         = raw_unhash,
 262         .connect        = raw_connect,
 263         .disconnect     = raw_disconnect,
 264         .getsockopt     = raw_getsockopt,
 265         .setsockopt     = raw_setsockopt,
 266 };
 267