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  * Written by:
  16  * Sergey Lapin <slapin@ossfans.org>
  17  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  18  */
  19
  20 #include <linux/net.h>
  21 #include <linux/module.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/list.h>
  24 #include <linux/slab.h>
  25 #include <net/sock.h>
  26 #include <net/af_ieee802154.h>
  27 #include <net/ieee802154_netdev.h>
  28
  29 #include "af802154.h"
  30
  31 static HLIST_HEAD(raw_head);
  32 static DEFINE_RWLOCK(raw_lock);
  33
  34 static void raw_hash(struct sock *sk)
  35 {
  36         write_lock_bh(&raw_lock);
  37         sk_add_node(sk, &raw_head);
  38         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  39         write_unlock_bh(&raw_lock);
  40 }
  41
  42 static void raw_unhash(struct sock *sk)
  43 {
  44         write_lock_bh(&raw_lock);
  45         if (sk_del_node_init(sk))
  46                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  47         write_unlock_bh(&raw_lock);
  48 }
  49
  50 static void raw_close(struct sock *sk, long timeout)
  51 {
  52         sk_common_release(sk);
  53 }
  54
  55 static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
  56 {
  57         struct ieee802154_addr addr;
  58         struct sockaddr_ieee802154 *uaddr = (struct sockaddr_ieee802154 *)_uaddr;
  59         int err = 0;
  60         struct net_device *dev = NULL;
  61
  62         if (len < sizeof(*uaddr))
  63                 return -EINVAL;
  64
  65         uaddr = (struct sockaddr_ieee802154 *)_uaddr;
  66         if (uaddr->family != AF_IEEE802154)
  67                 return -EINVAL;
  68
  69         lock_sock(sk);
  70
  71         ieee802154_addr_from_sa(&addr, &uaddr->addr);
  72         dev = ieee802154_get_dev(sock_net(sk), &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,
 106                        struct msghdr *msg, 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_from_msg(skb_put(skb, size), msg, 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_msg(skb, 0, msg, 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         skb = skb_share_check(skb, GFP_ATOMIC);
 213         if (!skb)
 214                 return NET_RX_DROP;
 215
 216         if (sock_queue_rcv_skb(sk, skb) < 0) {
 217                 kfree_skb(skb);
 218                 return NET_RX_DROP;
 219         }
 220
 221         return NET_RX_SUCCESS;
 222 }
 223
 224
 225 void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)
 226 {
 227         struct sock *sk;
 228
 229         read_lock(&raw_lock);
 230         sk_for_each(sk, &raw_head) {
 231                 bh_lock_sock(sk);
 232                 if (!sk->sk_bound_dev_if ||
 233                     sk->sk_bound_dev_if == dev->ifindex) {
 234                         struct sk_buff *clone;
 235
 236                         clone = skb_clone(skb, GFP_ATOMIC);
 237                         if (clone)
 238                                 raw_rcv_skb(sk, clone);
 239                 }
 240                 bh_unlock_sock(sk);
 241         }
 242         read_unlock(&raw_lock);
 243 }
 244
 245 static int raw_getsockopt(struct sock *sk, int level, int optname,
 246                           char __user *optval, int __user *optlen)
 247 {
 248         return -EOPNOTSUPP;
 249 }
 250
 251 static int raw_setsockopt(struct sock *sk, int level, int optname,
 252                           char __user *optval, unsigned int optlen)
 253 {
 254         return -EOPNOTSUPP;
 255 }
 256
 257 struct proto ieee802154_raw_prot = {
 258         .name           = "IEEE-802.15.4-RAW",
 259         .owner          = THIS_MODULE,
 260         .obj_size       = sizeof(struct sock),
 261         .close          = raw_close,
 262         .bind           = raw_bind,
 263         .sendmsg        = raw_sendmsg,
 264         .recvmsg        = raw_recvmsg,
 265         .hash           = raw_hash,
 266         .unhash         = raw_unhash,
 267         .connect        = raw_connect,
 268         .disconnect     = raw_disconnect,
 269         .getsockopt     = raw_getsockopt,
 270         .setsockopt     = raw_setsockopt,
 271 };