[deliverable/linux.git] / net / ieee802154 / dgram.c

/*
 * IEEE 802.15.4 dgram socket interface
 *
 * Copyright 2007, 2008 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 */

#include <linux/net.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/af_ieee802154.h>
#include <net/ieee802154.h>
#include <net/ieee802154_netdev.h>

#include <asm/ioctls.h>

#include "af802154.h"

static HLIST_HEAD(dgram_head);
static DEFINE_RWLOCK(dgram_lock);

struct dgram_sock {
	struct sock sk;

	struct ieee802154_addr src_addr;
	struct ieee802154_addr dst_addr;

	unsigned int bound:1;
	unsigned int want_ack:1;
};

static inline struct dgram_sock *dgram_sk(const struct sock *sk)
{
	return container_of(sk, struct dgram_sock, sk);
}

static void dgram_hash(struct sock *sk)
{
	write_lock_bh(&dgram_lock);
	sk_add_node(sk, &dgram_head);
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
	write_unlock_bh(&dgram_lock);
}

static void dgram_unhash(struct sock *sk)
{
	write_lock_bh(&dgram_lock);
	if (sk_del_node_init(sk))
		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
	write_unlock_bh(&dgram_lock);
}

static int dgram_init(struct sock *sk)
{
	struct dgram_sock *ro = dgram_sk(sk);

	ro->dst_addr.mode = IEEE802154_ADDR_LONG;
	ro->dst_addr.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
	ro->want_ack = 1;
	memset(&ro->dst_addr.extended_addr, 0xff, IEEE802154_ADDR_LEN);
	return 0;
}

static void dgram_close(struct sock *sk, long timeout)
{
	sk_common_release(sk);
}

static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
{
	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
	struct ieee802154_addr haddr;
	struct dgram_sock *ro = dgram_sk(sk);
	int err = -EINVAL;
	struct net_device *dev;

	lock_sock(sk);

	ro->bound = 0;

	if (len < sizeof(*addr))
		goto out;

	if (addr->family != AF_IEEE802154)
		goto out;

	ieee802154_addr_from_sa(&haddr, &addr->addr);
	dev = ieee802154_get_dev(sock_net(sk), &haddr);
	if (!dev) {
		err = -ENODEV;
		goto out;
	}

	if (dev->type != ARPHRD_IEEE802154) {
		err = -ENODEV;
		goto out_put;
	}

	ro->src_addr = haddr;

	ro->bound = 1;
	err = 0;
out_put:
	dev_put(dev);
out:
	release_sock(sk);

	return err;
}

static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
	switch (cmd) {
	case SIOCOUTQ:
	{
		int amount = sk_wmem_alloc_get(sk);

		return put_user(amount, (int __user *)arg);
	}

	case SIOCINQ:
	{
		struct sk_buff *skb;
		unsigned long amount;

		amount = 0;
		spin_lock_bh(&sk->sk_receive_queue.lock);
		skb = skb_peek(&sk->sk_receive_queue);
		if (skb != NULL) {
			/*
			 * We will only return the amount
			 * of this packet since that is all
			 * that will be read.
			 */
			amount = skb->len - ieee802154_hdr_length(skb);
		}
		spin_unlock_bh(&sk->sk_receive_queue.lock);
		return put_user(amount, (int __user *)arg);
	}

	}
	return -ENOIOCTLCMD;
}

/* FIXME: autobind */
static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
			int len)
{
	struct sockaddr_ieee802154 *addr = (struct sockaddr_ieee802154 *)uaddr;
	struct dgram_sock *ro = dgram_sk(sk);
	int err = 0;

	if (len < sizeof(*addr))
		return -EINVAL;

	if (addr->family != AF_IEEE802154)
		return -EINVAL;

	lock_sock(sk);

	if (!ro->bound) {
		err = -ENETUNREACH;
		goto out;
	}

	ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);

out:
	release_sock(sk);
	return err;
}

static int dgram_disconnect(struct sock *sk, int flags)
{
	struct dgram_sock *ro = dgram_sk(sk);

	lock_sock(sk);

	ro->dst_addr.mode = IEEE802154_ADDR_LONG;
	memset(&ro->dst_addr.extended_addr, 0xff, IEEE802154_ADDR_LEN);

	release_sock(sk);

	return 0;
}

static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
		struct msghdr *msg, size_t size)
{
	struct net_device *dev;
	unsigned int mtu;
	struct sk_buff *skb;
	struct dgram_sock *ro = dgram_sk(sk);
	int hlen, tlen;
	int err;

	if (msg->msg_flags & MSG_OOB) {
		pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
		return -EOPNOTSUPP;
	}

	if (!ro->bound)
		dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
	else
		dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);

	if (!dev) {
		pr_debug("no dev\n");
		err = -ENXIO;
		goto out;
	}
	mtu = dev->mtu;
	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);

	if (size > mtu) {
		pr_debug("size = %Zu, mtu = %u\n", size, mtu);
		err = -EMSGSIZE;
		goto out_dev;
	}

	hlen = LL_RESERVED_SPACE(dev);
	tlen = dev->needed_tailroom;
	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
			msg->msg_flags & MSG_DONTWAIT,
			&err);
	if (!skb)
		goto out_dev;

	skb_reserve(skb, hlen);

	skb_reset_network_header(skb);

	mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
	if (ro->want_ack)
		mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;

	mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
	err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
			ro->bound ? &ro->src_addr : NULL, size);
	if (err < 0)
		goto out_skb;

	skb_reset_mac_header(skb);

	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
	if (err < 0)
		goto out_skb;

	skb->dev = dev;
	skb->sk  = sk;
	skb->protocol = htons(ETH_P_IEEE802154);

	dev_put(dev);

	err = dev_queue_xmit(skb);
	if (err > 0)
		err = net_xmit_errno(err);

	return err ?: size;

out_skb:
	kfree_skb(skb);
out_dev:
	dev_put(dev);
out:
	return err;
}

static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
		struct msghdr *msg, size_t len, int noblock, int flags,
		int *addr_len)
{
	size_t copied = 0;
	int err = -EOPNOTSUPP;
	struct sk_buff *skb;
	DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);

	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
		goto out;

	copied = skb->len;
	if (len < copied) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

	/* FIXME: skip headers if necessary ?! */
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto done;

	sock_recv_ts_and_drops(msg, sk, skb);

	if (saddr) {
		saddr->family = AF_IEEE802154;
		ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
		*addr_len = sizeof(*saddr);
	}

	if (flags & MSG_TRUNC)
		copied = skb->len;
done:
	skb_free_datagram(sk, skb);
out:
	if (err)
		return err;
	return copied;
}

static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
		return NET_RX_DROP;

	if (sock_queue_rcv_skb(sk, skb) < 0) {
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	return NET_RX_SUCCESS;
}

static inline bool
ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
		      struct dgram_sock *ro)
{
	if (!ro->bound)
		return true;

	if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
	    hw_addr == ro->src_addr.extended_addr)
		return true;

	if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
	    pan_id == ro->src_addr.pan_id &&
	    short_addr == ro->src_addr.short_addr)
		return true;

	return false;
}

int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
{
	struct sock *sk, *prev = NULL;
	int ret = NET_RX_SUCCESS;
	__le16 pan_id, short_addr;
	__le64 hw_addr;

	/* Data frame processing */
	BUG_ON(dev->type != ARPHRD_IEEE802154);

	pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
	short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
	hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);

	read_lock(&dgram_lock);
	sk_for_each(sk, &dgram_head) {
		if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
					  dgram_sk(sk))) {
			if (prev) {
				struct sk_buff *clone;
				clone = skb_clone(skb, GFP_ATOMIC);
				if (clone)
					dgram_rcv_skb(prev, clone);
			}

			prev = sk;
		}
	}

	if (prev)
		dgram_rcv_skb(prev, skb);
	else {
		kfree_skb(skb);
		ret = NET_RX_DROP;
	}
	read_unlock(&dgram_lock);

	return ret;
}

static int dgram_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct dgram_sock *ro = dgram_sk(sk);

	int val, len;

	if (level != SOL_IEEE802154)
		return -EOPNOTSUPP;

	if (get_user(len, optlen))
		return -EFAULT;

	len = min_t(unsigned int, len, sizeof(int));

	switch (optname) {
	case WPAN_WANTACK:
		val = ro->want_ack;
		break;
	default:
		return -ENOPROTOOPT;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

static int dgram_setsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, unsigned int optlen)
{
	struct dgram_sock *ro = dgram_sk(sk);
	int val;
	int err = 0;

	if (optlen < sizeof(int))
		return -EINVAL;

	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	lock_sock(sk);

	switch (optname) {
	case WPAN_WANTACK:
		ro->want_ack = !!val;
		break;
	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

struct proto ieee802154_dgram_prot = {
	.name		= "IEEE-802.15.4-MAC",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct dgram_sock),
	.init		= dgram_init,
	.close		= dgram_close,
	.bind		= dgram_bind,
	.sendmsg	= dgram_sendmsg,
	.recvmsg	= dgram_recvmsg,
	.hash		= dgram_hash,
	.unhash		= dgram_unhash,
	.connect	= dgram_connect,
	.disconnect	= dgram_disconnect,
	.ioctl		= dgram_ioctl,
	.getsockopt	= dgram_getsockopt,
	.setsockopt	= dgram_setsockopt,
};
Commit	Line	Data
9ec76716	1	/*
5fd72607	2	* IEEE 802.15.4 dgram socket interface
9ec76716 SL	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>
5a0e3ad6	28	#include <linux/slab.h>
9ec76716	29	#include <net/sock.h>
f0166e5e DES	30	#include <net/af_ieee802154.h>
	31	#include <net/ieee802154.h>
	32	#include <net/ieee802154_netdev.h>
9ec76716 SL	33
	34	#include <asm/ioctls.h>
	35
	36	#include "af802154.h"
	37
	38	static HLIST_HEAD(dgram_head);
	39	static DEFINE_RWLOCK(dgram_lock);
	40
	41	struct dgram_sock {
	42	struct sock sk;
	43
e6278d92 PB	44	struct ieee802154_addr src_addr;
e6278d92 PB	45	struct ieee802154_addr dst_addr;
74eda55d	46
95c96174 ED	47	unsigned int bound:1;
95c96174 ED	48	unsigned int want_ack:1;
9ec76716 SL	49	};
	50
	51	static inline struct dgram_sock dgram_sk(const struct sock sk)
	52	{
	53	return container_of(sk, struct dgram_sock, sk);
	54	}
	55
9ec76716 SL	56	static void dgram_hash(struct sock *sk)
	57	{
	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);
	62	}
	63
	64	static void dgram_unhash(struct sock *sk)
	65	{
	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);
	70	}
	71
	72	static int dgram_init(struct sock *sk)
	73	{
	74	struct dgram_sock *ro = dgram_sk(sk);
	75
e6278d92	76	ro->dst_addr.mode = IEEE802154_ADDR_LONG;
54af36e7	77	ro->dst_addr.pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
99eb8558	78	ro->want_ack = 1;
e6278d92	79	memset(&ro->dst_addr.extended_addr, 0xff, IEEE802154_ADDR_LEN);
9ec76716 SL	80	return 0;
	81	}
	82
	83	static void dgram_close(struct sock *sk, long timeout)
	84	{
	85	sk_common_release(sk);
	86	}
	87
	88	static int dgram_bind(struct sock sk, struct sockaddr uaddr, int len)
	89	{
	90	struct sockaddr_ieee802154 addr = (struct sockaddr_ieee802154 )uaddr;
e6278d92	91	struct ieee802154_addr haddr;
9ec76716	92	struct dgram_sock *ro = dgram_sk(sk);
74eda55d	93	int err = -EINVAL;
9ec76716 SL	94	struct net_device *dev;
9ec76716 SL	95
74eda55d DB	96	lock_sock(sk);
74eda55d DB	97
9ec76716 SL	98	ro->bound = 0;
	99
	100	if (len < sizeof(*addr))
74eda55d	101	goto out;
9ec76716 SL	102
9ec76716 SL	103	if (addr->family != AF_IEEE802154)
74eda55d	104	goto out;
9ec76716	105
e6278d92 PB	106	ieee802154_addr_from_sa(&haddr, &addr->addr);
e6278d92 PB	107	dev = ieee802154_get_dev(sock_net(sk), &haddr);
9ec76716 SL	108	if (!dev) {
	109	err = -ENODEV;
	110	goto out;
	111	}
	112
	113	if (dev->type != ARPHRD_IEEE802154) {
	114	err = -ENODEV;
	115	goto out_put;
	116	}
	117
e6278d92	118	ro->src_addr = haddr;
9ec76716 SL	119
9ec76716 SL	120	ro->bound = 1;
74eda55d	121	err = 0;
9ec76716 SL	122	out_put:
	123	dev_put(dev);
	124	out:
	125	release_sock(sk);
	126
	127	return err;
	128	}
	129
	130	static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
	131	{
	132	switch (cmd) {
	133	case SIOCOUTQ:
	134	{
31e6d363 ED	135	int amount = sk_wmem_alloc_get(sk);
31e6d363 ED	136
9ec76716 SL	137	return put_user(amount, (int __user *)arg);
	138	}
	139
	140	case SIOCINQ:
	141	{
	142	struct sk_buff *skb;
	143	unsigned long amount;
	144
	145	amount = 0;
	146	spin_lock_bh(&sk->sk_receive_queue.lock);
	147	skb = skb_peek(&sk->sk_receive_queue);
	148	if (skb != NULL) {
	149	/*
	150	* We will only return the amount
	151	* of this packet since that is all
	152	* that will be read.
	153	*/
e6278d92	154	amount = skb->len - ieee802154_hdr_length(skb);
9ec76716 SL	155	}
	156	spin_unlock_bh(&sk->sk_receive_queue.lock);
	157	return put_user(amount, (int __user *)arg);
	158	}
	159
	160	}
	161	return -ENOIOCTLCMD;
	162	}
	163
	164	/* FIXME: autobind */
	165	static int dgram_connect(struct sock sk, struct sockaddr uaddr,
	166	int len)
	167	{
	168	struct sockaddr_ieee802154 addr = (struct sockaddr_ieee802154 )uaddr;
	169	struct dgram_sock *ro = dgram_sk(sk);
	170	int err = 0;
	171
	172	if (len < sizeof(*addr))
	173	return -EINVAL;
	174
	175	if (addr->family != AF_IEEE802154)
	176	return -EINVAL;
	177
	178	lock_sock(sk);
	179
	180	if (!ro->bound) {
	181	err = -ENETUNREACH;
	182	goto out;
	183	}
	184
e6278d92	185	ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
9ec76716 SL	186
	187	out:
	188	release_sock(sk);
	189	return err;
	190	}
	191
	192	static int dgram_disconnect(struct sock *sk, int flags)
	193	{
	194	struct dgram_sock *ro = dgram_sk(sk);
	195
	196	lock_sock(sk);
	197
e6278d92 PB	198	ro->dst_addr.mode = IEEE802154_ADDR_LONG;
e6278d92 PB	199	memset(&ro->dst_addr.extended_addr, 0xff, IEEE802154_ADDR_LEN);
9ec76716 SL	200
	201	release_sock(sk);
	202
	203	return 0;
	204	}
	205
	206	static int dgram_sendmsg(struct kiocb iocb, struct sock sk,
	207	struct msghdr *msg, size_t size)
	208	{
	209	struct net_device *dev;
95c96174	210	unsigned int mtu;
9ec76716 SL	211	struct sk_buff *skb;
9ec76716 SL	212	struct dgram_sock *ro = dgram_sk(sk);
ae641949	213	int hlen, tlen;
9ec76716 SL	214	int err;
	215
	216	if (msg->msg_flags & MSG_OOB) {
	217	pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
	218	return -EOPNOTSUPP;
	219	}
	220
	221	if (!ro->bound)
	222	dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
	223	else
	224	dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
	225
	226	if (!dev) {
	227	pr_debug("no dev\n");
	228	err = -ENXIO;
	229	goto out;
	230	}
	231	mtu = dev->mtu;
	232	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
	233
3da947b2 SL	234	if (size > mtu) {
3da947b2 SL	235	pr_debug("size = %Zu, mtu = %u\n", size, mtu);
d1d7358e	236	err = -EMSGSIZE;
3da947b2 SL	237	goto out_dev;
	238	}
	239
ae641949 HX	240	hlen = LL_RESERVED_SPACE(dev);
	241	tlen = dev->needed_tailroom;
	242	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
9ec76716 SL	243	msg->msg_flags & MSG_DONTWAIT,
	244	&err);
	245	if (!skb)
	246	goto out_dev;
	247
ae641949	248	skb_reserve(skb, hlen);
9ec76716 SL	249
	250	skb_reset_network_header(skb);
	251
99eb8558 DB	252	mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
	253	if (ro->want_ack)
	254	mac_cb(skb)->flags \|= MAC_CB_FLAG_ACKREQ;
	255
9ec76716 SL	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);
	259	if (err < 0)
	260	goto out_skb;
	261
	262	skb_reset_mac_header(skb);
	263
	264	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
	265	if (err < 0)
	266	goto out_skb;
	267
9ec76716 SL	268	skb->dev = dev;
	269	skb->sk = sk;
	270	skb->protocol = htons(ETH_P_IEEE802154);
	271
	272	dev_put(dev);
	273
	274	err = dev_queue_xmit(skb);
	275	if (err > 0)
	276	err = net_xmit_errno(err);
	277
	278	return err ?: size;
	279
	280	out_skb:
	281	kfree_skb(skb);
	282	out_dev:
	283	dev_put(dev);
	284	out:
	285	return err;
	286	}
	287
	288	static int dgram_recvmsg(struct kiocb iocb, struct sock sk,
	289	struct msghdr *msg, size_t len, int noblock, int flags,
	290	int *addr_len)
	291	{
	292	size_t copied = 0;
	293	int err = -EOPNOTSUPP;
	294	struct sk_buff *skb;
342dfc30	295	DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
9ec76716 SL	296
	297	skb = skb_recv_datagram(sk, flags, noblock, &err);
	298	if (!skb)
	299	goto out;
	300
	301	copied = skb->len;
	302	if (len < copied) {
	303	msg->msg_flags \|= MSG_TRUNC;
	304	copied = len;
	305	}
	306
	307	/* FIXME: skip headers if necessary ?! */
	308	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	309	if (err)
	310	goto done;
	311
3b885787	312	sock_recv_ts_and_drops(msg, sk, skb);
9ec76716	313
6364e6ee SR	314	if (saddr) {
6364e6ee SR	315	saddr->family = AF_IEEE802154;
ae531b94	316	ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
6364e6ee	317	addr_len = sizeof(saddr);
bceaa902	318	}
6364e6ee	319
9ec76716 SL	320	if (flags & MSG_TRUNC)
	321	copied = skb->len;
	322	done:
	323	skb_free_datagram(sk, skb);
	324	out:
	325	if (err)
	326	return err;
	327	return copied;
	328	}
	329
	330	static int dgram_rcv_skb(struct sock sk, struct sk_buff skb)
	331	{
8cfad496 PB	332	skb = skb_share_check(skb, GFP_ATOMIC);
	333	if (!skb)
	334	return NET_RX_DROP;
	335
9ec76716	336	if (sock_queue_rcv_skb(sk, skb) < 0) {
9ec76716 SL	337	kfree_skb(skb);
	338	return NET_RX_DROP;
	339	}
	340
	341	return NET_RX_SUCCESS;
	342	}
	343
e6278d92 PB	344	static inline bool
	345	ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
	346	struct dgram_sock *ro)
9ec76716 SL	347	{
9ec76716 SL	348	if (!ro->bound)
e6278d92	349	return true;
9ec76716	350
e6278d92 PB	351	if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
	352	hw_addr == ro->src_addr.extended_addr)
	353	return true;
9ec76716	354
e6278d92 PB	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)
	358	return true;
9ec76716	359
e6278d92	360	return false;
9ec76716 SL	361	}
	362
	363	int ieee802154_dgram_deliver(struct net_device dev, struct sk_buff skb)
	364	{
	365	struct sock sk, prev = NULL;
9ec76716	366	int ret = NET_RX_SUCCESS;
e6278d92 PB	367	__le16 pan_id, short_addr;
e6278d92 PB	368	__le64 hw_addr;
9ec76716 SL	369
	370	/* Data frame processing */
	371	BUG_ON(dev->type != ARPHRD_IEEE802154);
	372
e6278d92 PB	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);
9ec76716 SL	376
9ec76716 SL	377	read_lock(&dgram_lock);
b67bfe0d	378	sk_for_each(sk, &dgram_head) {
e6278d92 PB	379	if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
e6278d92 PB	380	dgram_sk(sk))) {
9ec76716 SL	381	if (prev) {
	382	struct sk_buff *clone;
	383	clone = skb_clone(skb, GFP_ATOMIC);
	384	if (clone)
	385	dgram_rcv_skb(prev, clone);
	386	}
	387
	388	prev = sk;
	389	}
	390	}
	391
	392	if (prev)
	393	dgram_rcv_skb(prev, skb);
	394	else {
	395	kfree_skb(skb);
	396	ret = NET_RX_DROP;
	397	}
	398	read_unlock(&dgram_lock);
	399
	400	return ret;
	401	}
	402
a9dfac33 DES	403	static int dgram_getsockopt(struct sock *sk, int level, int optname,
	404	char __user optval, int __user optlen)
	405	{
99eb8558 DB	406	struct dgram_sock *ro = dgram_sk(sk);
	407
	408	int val, len;
	409
	410	if (level != SOL_IEEE802154)
	411	return -EOPNOTSUPP;
	412
	413	if (get_user(len, optlen))
	414	return -EFAULT;
	415
	416	len = min_t(unsigned int, len, sizeof(int));
	417
	418	switch (optname) {
	419	case WPAN_WANTACK:
	420	val = ro->want_ack;
	421	break;
	422	default:
	423	return -ENOPROTOOPT;
	424	}
	425
	426	if (put_user(len, optlen))
	427	return -EFAULT;
	428	if (copy_to_user(optval, &val, len))
	429	return -EFAULT;
	430	return 0;
a9dfac33 DES	431	}
	432
	433	static int dgram_setsockopt(struct sock *sk, int level, int optname,
b7058842	434	char __user *optval, unsigned int optlen)
a9dfac33	435	{
99eb8558 DB	436	struct dgram_sock *ro = dgram_sk(sk);
	437	int val;
	438	int err = 0;
	439
	440	if (optlen < sizeof(int))
	441	return -EINVAL;
	442
	443	if (get_user(val, (int __user *)optval))
	444	return -EFAULT;
	445
	446	lock_sock(sk);
	447
	448	switch (optname) {
	449	case WPAN_WANTACK:
	450	ro->want_ack = !!val;
	451	break;
	452	default:
	453	err = -ENOPROTOOPT;
	454	break;
	455	}
	456
	457	release_sock(sk);
	458	return err;
a9dfac33 DES	459	}
a9dfac33 DES	460
9ec76716 SL	461	struct proto ieee802154_dgram_prot = {
	462	.name = "IEEE-802.15.4-MAC",
	463	.owner = THIS_MODULE,
	464	.obj_size = sizeof(struct dgram_sock),
	465	.init = dgram_init,
	466	.close = dgram_close,
	467	.bind = dgram_bind,
	468	.sendmsg = dgram_sendmsg,
	469	.recvmsg = dgram_recvmsg,
	470	.hash = dgram_hash,
	471	.unhash = dgram_unhash,
	472	.connect = dgram_connect,
	473	.disconnect = dgram_disconnect,
	474	.ioctl = dgram_ioctl,
a9dfac33 DES	475	.getsockopt = dgram_getsockopt,
a9dfac33 DES	476	.setsockopt = dgram_setsockopt,
9ec76716 SL	477	};
9ec76716 SL	478