2 * IEEE 802.15.4 dgram socket interface
4 * Copyright 2007, 2008 Siemens AG
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.
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.
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.
20 * Sergey Lapin <slapin@ossfans.org>
21 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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>
30 #include <net/af_ieee802154.h>
31 #include <net/ieee802154.h>
32 #include <net/ieee802154_netdev.h>
34 #include <asm/ioctls.h>
38 static HLIST_HEAD(dgram_head);
39 static DEFINE_RWLOCK(dgram_lock);
44 struct ieee802154_addr src_addr;
45 struct ieee802154_addr dst_addr;
48 unsigned int want_ack:1;
51 static inline struct dgram_sock *dgram_sk(const struct sock *sk)
53 return container_of(sk, struct dgram_sock, sk);
56 static void dgram_hash(struct sock *sk)
58 write_lock_bh(&dgram_lock);
59 sk_add_node(sk, &dgram_head);
60 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
61 write_unlock_bh(&dgram_lock);
64 static void dgram_unhash(struct sock *sk)
66 write_lock_bh(&dgram_lock);
67 if (sk_del_node_init(sk))
68 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
69 write_unlock_bh(&dgram_lock);
72 static int dgram_init(struct sock *sk)
74 struct dgram_sock *ro = dgram_sk(sk);
76 ro->dst_addr.mode = IEEE802154_ADDR_LONG;
77 ro->dst_addr.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
79 memset(&ro->dst_addr.extended_addr, 0xff, IEEE802154_ADDR_LEN);
83 static void dgram_close(struct sock *sk, long timeout)
85 sk_common_release(sk);
88 static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
90 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
91 struct ieee802154_addr haddr;
92 struct dgram_sock *ro = dgram_sk(sk);
94 struct net_device *dev;
100 if (len < sizeof(*addr))
103 if (addr->family != AF_IEEE802154)
106 ieee802154_addr_from_sa(&haddr, &addr->addr);
107 dev = ieee802154_get_dev(sock_net(sk), &haddr);
113 if (dev->type != ARPHRD_IEEE802154) {
118 ro->src_addr = haddr;
130 static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
135 int amount = sk_wmem_alloc_get(sk);
137 return put_user(amount, (int __user *)arg);
143 unsigned long amount;
146 spin_lock_bh(&sk->sk_receive_queue.lock);
147 skb = skb_peek(&sk->sk_receive_queue);
150 * We will only return the amount
151 * of this packet since that is all
154 amount = skb->len - ieee802154_hdr_length(skb);
156 spin_unlock_bh(&sk->sk_receive_queue.lock);
157 return put_user(amount, (int __user *)arg);
164 /* FIXME: autobind */
165 static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
168 struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
169 struct dgram_sock *ro = dgram_sk(sk);
172 if (len < sizeof(*addr))
175 if (addr->family != AF_IEEE802154)
185 ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
192 static int dgram_disconnect(struct sock *sk, int flags)
194 struct dgram_sock *ro = dgram_sk(sk);
198 ro->dst_addr.mode = IEEE802154_ADDR_LONG;
199 memset(&ro->dst_addr.extended_addr, 0xff, IEEE802154_ADDR_LEN);
206 static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
207 struct msghdr *msg, size_t size)
209 struct net_device *dev;
212 struct dgram_sock *ro = dgram_sk(sk);
216 if (msg->msg_flags & MSG_OOB) {
217 pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
222 dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
224 dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
227 pr_debug("no dev\n");
232 pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
235 pr_debug("size = %Zu, mtu = %u\n", size, mtu);
240 hlen = LL_RESERVED_SPACE(dev);
241 tlen = dev->needed_tailroom;
242 skb = sock_alloc_send_skb(sk, hlen + tlen + size,
243 msg->msg_flags & MSG_DONTWAIT,
248 skb_reserve(skb, hlen);
250 skb_reset_network_header(skb);
252 mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
254 mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
256 mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
257 err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
258 ro->bound ? &ro->src_addr : NULL, size);
262 skb_reset_mac_header(skb);
264 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
270 skb->protocol = htons(ETH_P_IEEE802154);
274 err = dev_queue_xmit(skb);
276 err = net_xmit_errno(err);
288 static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
289 struct msghdr *msg, size_t len, int noblock, int flags,
293 int err = -EOPNOTSUPP;
295 DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
297 skb = skb_recv_datagram(sk, flags, noblock, &err);
303 msg->msg_flags |= MSG_TRUNC;
307 /* FIXME: skip headers if necessary ?! */
308 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
312 sock_recv_ts_and_drops(msg, sk, skb);
315 saddr->family = AF_IEEE802154;
316 ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
317 *addr_len = sizeof(*saddr);
320 if (flags & MSG_TRUNC)
323 skb_free_datagram(sk, skb);
330 static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
332 skb = skb_share_check(skb, GFP_ATOMIC);
336 if (sock_queue_rcv_skb(sk, skb) < 0) {
341 return NET_RX_SUCCESS;
345 ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
346 struct dgram_sock *ro)
351 if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
352 hw_addr == ro->src_addr.extended_addr)
355 if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
356 pan_id == ro->src_addr.pan_id &&
357 short_addr == ro->src_addr.short_addr)
363 int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
365 struct sock *sk, *prev = NULL;
366 int ret = NET_RX_SUCCESS;
367 __le16 pan_id, short_addr;
370 /* Data frame processing */
371 BUG_ON(dev->type != ARPHRD_IEEE802154);
373 pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
374 short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
375 hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);
377 read_lock(&dgram_lock);
378 sk_for_each(sk, &dgram_head) {
379 if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
382 struct sk_buff *clone;
383 clone = skb_clone(skb, GFP_ATOMIC);
385 dgram_rcv_skb(prev, clone);
393 dgram_rcv_skb(prev, skb);
398 read_unlock(&dgram_lock);
403 static int dgram_getsockopt(struct sock *sk, int level, int optname,
404 char __user *optval, int __user *optlen)
406 struct dgram_sock *ro = dgram_sk(sk);
410 if (level != SOL_IEEE802154)
413 if (get_user(len, optlen))
416 len = min_t(unsigned int, len, sizeof(int));
426 if (put_user(len, optlen))
428 if (copy_to_user(optval, &val, len))
433 static int dgram_setsockopt(struct sock *sk, int level, int optname,
434 char __user *optval, unsigned int optlen)
436 struct dgram_sock *ro = dgram_sk(sk);
440 if (optlen < sizeof(int))
443 if (get_user(val, (int __user *)optval))
450 ro->want_ack = !!val;
461 struct proto ieee802154_dgram_prot = {
462 .name = "IEEE-802.15.4-MAC",
463 .owner = THIS_MODULE,
464 .obj_size = sizeof(struct dgram_sock),
466 .close = dgram_close,
468 .sendmsg = dgram_sendmsg,
469 .recvmsg = dgram_recvmsg,
471 .unhash = dgram_unhash,
472 .connect = dgram_connect,
473 .disconnect = dgram_disconnect,
474 .ioctl = dgram_ioctl,
475 .getsockopt = dgram_getsockopt,
476 .setsockopt = dgram_setsockopt,