Sergey Lapin | 9ec7671 | 2009-06-08 12:18:48 +0000 | [diff] [blame] | 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> |
Dmitry Eremin-Solenikov | f0166e5 | 2009-07-23 16:56:29 +0400 | [diff] [blame] | 29 | #include <net/af_ieee802154.h> |
Sergey Lapin | 9ec7671 | 2009-06-08 12:18:48 +0000 | [diff] [blame] | 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 | |
Dmitry Eremin-Solenikov | 929122c | 2009-08-14 20:00:20 +0400 | [diff] [blame] | 77 | if (dev->type != ARPHRD_IEEE802154) { |
Sergey Lapin | 9ec7671 | 2009-06-08 12:18:48 +0000 | [diff] [blame] | 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) { |
David S. Miller | e5241c4 | 2009-06-11 02:10:19 -0700 | [diff] [blame] | 134 | pr_debug("size = %Zu, mtu = %u\n", size, mtu); |
Sergey Lapin | 9ec7671 | 2009-06-08 12:18:48 +0000 | [diff] [blame] | 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 | |
Dmitry Eremin-Solenikov | a9dfac3 | 2009-08-03 17:53:00 +0400 | [diff] [blame] | 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, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 247 | char __user *optval, unsigned int optlen) |
Dmitry Eremin-Solenikov | a9dfac3 | 2009-08-03 17:53:00 +0400 | [diff] [blame] | 248 | { |
| 249 | return -EOPNOTSUPP; |
| 250 | } |
| 251 | |
Sergey Lapin | 9ec7671 | 2009-06-08 12:18:48 +0000 | [diff] [blame] | 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, |
Dmitry Eremin-Solenikov | a9dfac3 | 2009-08-03 17:53:00 +0400 | [diff] [blame] | 264 | .getsockopt = raw_getsockopt, |
| 265 | .setsockopt = raw_setsockopt, |
Sergey Lapin | 9ec7671 | 2009-06-08 12:18:48 +0000 | [diff] [blame] | 266 | }; |
| 267 | |