[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 connected: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->want_ack = 1;
	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);
	ro->connected = 1;

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->connected = 0;
	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 ieee802154_mac_cb *cb;
	struct dgram_sock *ro = dgram_sk(sk);
	struct ieee802154_addr dst_addr;
	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->connected && !msg->msg_name)
		return -EDESTADDRREQ;
	else if (ro->connected && msg->msg_name)
		return -EISCONN;

	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);

	cb = mac_cb_init(skb);
	cb->type = IEEE802154_FC_TYPE_DATA;
	cb->ackreq = ro->want_ack;

	if (msg->msg_name) {
		DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);

		ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
	} else {
		dst_addr = ro->dst_addr;
	}

	err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
			      ro->bound ? &ro->src_addr : NULL, size);
	if (err < 0)
		goto out_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	47	unsigned int bound:1;
1cc76e36	48	unsigned int connected:1;
95c96174	49	unsigned int want_ack:1;
9ec76716 SL	50	};
	51
	52	static inline struct dgram_sock dgram_sk(const struct sock sk)
	53	{
	54	return container_of(sk, struct dgram_sock, sk);
	55	}
	56
9ec76716 SL	57	static void dgram_hash(struct sock *sk)
	58	{
	59	write_lock_bh(&dgram_lock);
	60	sk_add_node(sk, &dgram_head);
	61	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
	62	write_unlock_bh(&dgram_lock);
	63	}
	64
	65	static void dgram_unhash(struct sock *sk)
	66	{
	67	write_lock_bh(&dgram_lock);
	68	if (sk_del_node_init(sk))
	69	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
	70	write_unlock_bh(&dgram_lock);
	71	}
	72
	73	static int dgram_init(struct sock *sk)
	74	{
	75	struct dgram_sock *ro = dgram_sk(sk);
	76
99eb8558	77	ro->want_ack = 1;
9ec76716 SL	78	return 0;
	79	}
	80
	81	static void dgram_close(struct sock *sk, long timeout)
	82	{
	83	sk_common_release(sk);
	84	}
	85
	86	static int dgram_bind(struct sock sk, struct sockaddr uaddr, int len)
	87	{
	88	struct sockaddr_ieee802154 addr = (struct sockaddr_ieee802154 )uaddr;
e6278d92	89	struct ieee802154_addr haddr;
9ec76716	90	struct dgram_sock *ro = dgram_sk(sk);
74eda55d	91	int err = -EINVAL;
9ec76716 SL	92	struct net_device *dev;
9ec76716 SL	93
74eda55d DB	94	lock_sock(sk);
74eda55d DB	95
9ec76716 SL	96	ro->bound = 0;
	97
	98	if (len < sizeof(*addr))
74eda55d	99	goto out;
9ec76716 SL	100
9ec76716 SL	101	if (addr->family != AF_IEEE802154)
74eda55d	102	goto out;
9ec76716	103
e6278d92 PB	104	ieee802154_addr_from_sa(&haddr, &addr->addr);
e6278d92 PB	105	dev = ieee802154_get_dev(sock_net(sk), &haddr);
9ec76716 SL	106	if (!dev) {
	107	err = -ENODEV;
	108	goto out;
	109	}
	110
	111	if (dev->type != ARPHRD_IEEE802154) {
	112	err = -ENODEV;
	113	goto out_put;
	114	}
	115
e6278d92	116	ro->src_addr = haddr;
9ec76716 SL	117
9ec76716 SL	118	ro->bound = 1;
74eda55d	119	err = 0;
9ec76716 SL	120	out_put:
	121	dev_put(dev);
	122	out:
	123	release_sock(sk);
	124
	125	return err;
	126	}
	127
	128	static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
	129	{
	130	switch (cmd) {
	131	case SIOCOUTQ:
	132	{
31e6d363 ED	133	int amount = sk_wmem_alloc_get(sk);
31e6d363 ED	134
9ec76716 SL	135	return put_user(amount, (int __user *)arg);
	136	}
	137
	138	case SIOCINQ:
	139	{
	140	struct sk_buff *skb;
	141	unsigned long amount;
	142
	143	amount = 0;
	144	spin_lock_bh(&sk->sk_receive_queue.lock);
	145	skb = skb_peek(&sk->sk_receive_queue);
	146	if (skb != NULL) {
	147	/*
	148	* We will only return the amount
	149	* of this packet since that is all
	150	* that will be read.
	151	*/
e6278d92	152	amount = skb->len - ieee802154_hdr_length(skb);
9ec76716 SL	153	}
	154	spin_unlock_bh(&sk->sk_receive_queue.lock);
	155	return put_user(amount, (int __user *)arg);
	156	}
	157
	158	}
	159	return -ENOIOCTLCMD;
	160	}
	161
	162	/* FIXME: autobind */
	163	static int dgram_connect(struct sock sk, struct sockaddr uaddr,
	164	int len)
	165	{
	166	struct sockaddr_ieee802154 addr = (struct sockaddr_ieee802154 )uaddr;
	167	struct dgram_sock *ro = dgram_sk(sk);
	168	int err = 0;
	169
	170	if (len < sizeof(*addr))
	171	return -EINVAL;
	172
	173	if (addr->family != AF_IEEE802154)
	174	return -EINVAL;
	175
	176	lock_sock(sk);
	177
	178	if (!ro->bound) {
	179	err = -ENETUNREACH;
	180	goto out;
	181	}
	182
e6278d92	183	ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
1cc76e36	184	ro->connected = 1;
9ec76716 SL	185
	186	out:
	187	release_sock(sk);
	188	return err;
	189	}
	190
	191	static int dgram_disconnect(struct sock *sk, int flags)
	192	{
	193	struct dgram_sock *ro = dgram_sk(sk);
	194
	195	lock_sock(sk);
1cc76e36	196	ro->connected = 0;
9ec76716 SL	197	release_sock(sk);
	198
	199	return 0;
	200	}
	201
	202	static int dgram_sendmsg(struct kiocb iocb, struct sock sk,
	203	struct msghdr *msg, size_t size)
	204	{
	205	struct net_device *dev;
95c96174	206	unsigned int mtu;
9ec76716	207	struct sk_buff *skb;
32edc40a	208	struct ieee802154_mac_cb *cb;
9ec76716	209	struct dgram_sock *ro = dgram_sk(sk);
1cc76e36	210	struct ieee802154_addr dst_addr;
ae641949	211	int hlen, tlen;
9ec76716 SL	212	int err;
	213
	214	if (msg->msg_flags & MSG_OOB) {
	215	pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
	216	return -EOPNOTSUPP;
	217	}
	218
1cc76e36 PB	219	if (!ro->connected && !msg->msg_name)
	220	return -EDESTADDRREQ;
	221	else if (ro->connected && msg->msg_name)
	222	return -EISCONN;
	223
9ec76716 SL	224	if (!ro->bound)
	225	dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
	226	else
	227	dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
	228
	229	if (!dev) {
	230	pr_debug("no dev\n");
	231	err = -ENXIO;
	232	goto out;
	233	}
	234	mtu = dev->mtu;
	235	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
	236
3da947b2 SL	237	if (size > mtu) {
3da947b2 SL	238	pr_debug("size = %Zu, mtu = %u\n", size, mtu);
d1d7358e	239	err = -EMSGSIZE;
3da947b2 SL	240	goto out_dev;
	241	}
	242
ae641949 HX	243	hlen = LL_RESERVED_SPACE(dev);
	244	tlen = dev->needed_tailroom;
	245	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
9ec76716 SL	246	msg->msg_flags & MSG_DONTWAIT,
	247	&err);
	248	if (!skb)
	249	goto out_dev;
	250
ae641949	251	skb_reserve(skb, hlen);
9ec76716 SL	252
	253	skb_reset_network_header(skb);
	254
32edc40a PB	255	cb = mac_cb_init(skb);
	256	cb->type = IEEE802154_FC_TYPE_DATA;
	257	cb->ackreq = ro->want_ack;
99eb8558	258
1cc76e36 PB	259	if (msg->msg_name) {
	260	DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
	261
	262	ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
	263	} else {
	264	dst_addr = ro->dst_addr;
	265	}
	266
	267	err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
	268	ro->bound ? &ro->src_addr : NULL, size);
9ec76716 SL	269	if (err < 0)
	270	goto out_skb;
	271
9ec76716 SL	272	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
	273	if (err < 0)
	274	goto out_skb;
	275
9ec76716 SL	276	skb->dev = dev;
	277	skb->sk = sk;
	278	skb->protocol = htons(ETH_P_IEEE802154);
	279
	280	dev_put(dev);
	281
	282	err = dev_queue_xmit(skb);
	283	if (err > 0)
	284	err = net_xmit_errno(err);
	285
	286	return err ?: size;
	287
	288	out_skb:
	289	kfree_skb(skb);
	290	out_dev:
	291	dev_put(dev);
	292	out:
	293	return err;
	294	}
	295
	296	static int dgram_recvmsg(struct kiocb iocb, struct sock sk,
	297	struct msghdr *msg, size_t len, int noblock, int flags,
	298	int *addr_len)
	299	{
	300	size_t copied = 0;
	301	int err = -EOPNOTSUPP;
	302	struct sk_buff *skb;
342dfc30	303	DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
9ec76716 SL	304
	305	skb = skb_recv_datagram(sk, flags, noblock, &err);
	306	if (!skb)
	307	goto out;
	308
	309	copied = skb->len;
	310	if (len < copied) {
	311	msg->msg_flags \|= MSG_TRUNC;
	312	copied = len;
	313	}
	314
	315	/* FIXME: skip headers if necessary ?! */
	316	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	317	if (err)
	318	goto done;
	319
3b885787	320	sock_recv_ts_and_drops(msg, sk, skb);
9ec76716	321
6364e6ee SR	322	if (saddr) {
6364e6ee SR	323	saddr->family = AF_IEEE802154;
ae531b94	324	ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
6364e6ee	325	addr_len = sizeof(saddr);
bceaa902	326	}
6364e6ee	327
9ec76716 SL	328	if (flags & MSG_TRUNC)
	329	copied = skb->len;
	330	done:
	331	skb_free_datagram(sk, skb);
	332	out:
	333	if (err)
	334	return err;
	335	return copied;
	336	}
	337
	338	static int dgram_rcv_skb(struct sock sk, struct sk_buff skb)
	339	{
8cfad496 PB	340	skb = skb_share_check(skb, GFP_ATOMIC);
	341	if (!skb)
	342	return NET_RX_DROP;
	343
9ec76716	344	if (sock_queue_rcv_skb(sk, skb) < 0) {
9ec76716 SL	345	kfree_skb(skb);
	346	return NET_RX_DROP;
	347	}
	348
	349	return NET_RX_SUCCESS;
	350	}
	351
e6278d92 PB	352	static inline bool
	353	ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
	354	struct dgram_sock *ro)
9ec76716 SL	355	{
9ec76716 SL	356	if (!ro->bound)
e6278d92	357	return true;
9ec76716	358
e6278d92 PB	359	if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
	360	hw_addr == ro->src_addr.extended_addr)
	361	return true;
9ec76716	362
e6278d92 PB	363	if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
	364	pan_id == ro->src_addr.pan_id &&
	365	short_addr == ro->src_addr.short_addr)
	366	return true;
9ec76716	367
e6278d92	368	return false;
9ec76716 SL	369	}
	370
	371	int ieee802154_dgram_deliver(struct net_device dev, struct sk_buff skb)
	372	{
	373	struct sock sk, prev = NULL;
9ec76716	374	int ret = NET_RX_SUCCESS;
e6278d92 PB	375	__le16 pan_id, short_addr;
e6278d92 PB	376	__le64 hw_addr;
9ec76716 SL	377
	378	/* Data frame processing */
	379	BUG_ON(dev->type != ARPHRD_IEEE802154);
	380
e6278d92 PB	381	pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
	382	short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
	383	hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);
9ec76716 SL	384
9ec76716 SL	385	read_lock(&dgram_lock);
b67bfe0d	386	sk_for_each(sk, &dgram_head) {
e6278d92 PB	387	if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
e6278d92 PB	388	dgram_sk(sk))) {
9ec76716 SL	389	if (prev) {
	390	struct sk_buff *clone;
	391	clone = skb_clone(skb, GFP_ATOMIC);
	392	if (clone)
	393	dgram_rcv_skb(prev, clone);
	394	}
	395
	396	prev = sk;
	397	}
	398	}
	399
	400	if (prev)
	401	dgram_rcv_skb(prev, skb);
	402	else {
	403	kfree_skb(skb);
	404	ret = NET_RX_DROP;
	405	}
	406	read_unlock(&dgram_lock);
	407
	408	return ret;
	409	}
	410
a9dfac33 DES	411	static int dgram_getsockopt(struct sock *sk, int level, int optname,
	412	char __user optval, int __user optlen)
	413	{
99eb8558 DB	414	struct dgram_sock *ro = dgram_sk(sk);
	415
	416	int val, len;
	417
	418	if (level != SOL_IEEE802154)
	419	return -EOPNOTSUPP;
	420
	421	if (get_user(len, optlen))
	422	return -EFAULT;
	423
	424	len = min_t(unsigned int, len, sizeof(int));
	425
	426	switch (optname) {
	427	case WPAN_WANTACK:
	428	val = ro->want_ack;
	429	break;
	430	default:
	431	return -ENOPROTOOPT;
	432	}
	433
	434	if (put_user(len, optlen))
	435	return -EFAULT;
	436	if (copy_to_user(optval, &val, len))
	437	return -EFAULT;
	438	return 0;
a9dfac33 DES	439	}
	440
	441	static int dgram_setsockopt(struct sock *sk, int level, int optname,
b7058842	442	char __user *optval, unsigned int optlen)
a9dfac33	443	{
99eb8558 DB	444	struct dgram_sock *ro = dgram_sk(sk);
	445	int val;
	446	int err = 0;
	447
	448	if (optlen < sizeof(int))
	449	return -EINVAL;
	450
	451	if (get_user(val, (int __user *)optval))
	452	return -EFAULT;
	453
	454	lock_sock(sk);
	455
	456	switch (optname) {
	457	case WPAN_WANTACK:
	458	ro->want_ack = !!val;
	459	break;
	460	default:
	461	err = -ENOPROTOOPT;
	462	break;
	463	}
	464
	465	release_sock(sk);
	466	return err;
a9dfac33 DES	467	}
a9dfac33 DES	468
9ec76716 SL	469	struct proto ieee802154_dgram_prot = {
	470	.name = "IEEE-802.15.4-MAC",
	471	.owner = THIS_MODULE,
	472	.obj_size = sizeof(struct dgram_sock),
	473	.init = dgram_init,
	474	.close = dgram_close,
	475	.bind = dgram_bind,
	476	.sendmsg = dgram_sendmsg,
	477	.recvmsg = dgram_recvmsg,
	478	.hash = dgram_hash,
	479	.unhash = dgram_unhash,
	480	.connect = dgram_connect,
	481	.disconnect = dgram_disconnect,
	482	.ioctl = dgram_ioctl,
a9dfac33 DES	483	.getsockopt = dgram_getsockopt,
a9dfac33 DES	484	.setsockopt = dgram_setsockopt,
9ec76716 SL	485	};
9ec76716 SL	486