[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.
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 */

#include <linux/capability.h>
#include <linux/net.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/ieee802154.h>
#include <net/sock.h>
#include <net/af_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;
	unsigned int secen:1;
	unsigned int secen_override:1;
	unsigned int seclevel:3;
	unsigned int seclevel_override: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;
	}

	cb->secen = ro->secen;
	cb->secen_override = ro->secen_override;
	cb->seclevel = ro->seclevel;
	cb->seclevel_override = ro->seclevel_override;

	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_from_msg(skb_put(skb, size), msg, 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_msg(skb, 0, msg, 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;
	case WPAN_SECURITY:
		if (!ro->secen_override)
			val = WPAN_SECURITY_DEFAULT;
		else if (ro->secen)
			val = WPAN_SECURITY_ON;
		else
			val = WPAN_SECURITY_OFF;
		break;
	case WPAN_SECURITY_LEVEL:
		if (!ro->seclevel_override)
			val = WPAN_SECURITY_LEVEL_DEFAULT;
		else
			val = ro->seclevel;
		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);
	struct net *net = sock_net(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;
	case WPAN_SECURITY:
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
		    !ns_capable(net->user_ns, CAP_NET_RAW)) {
			err = -EPERM;
			break;
		}

		switch (val) {
		case WPAN_SECURITY_DEFAULT:
			ro->secen_override = 0;
			break;
		case WPAN_SECURITY_ON:
			ro->secen_override = 1;
			ro->secen = 1;
			break;
		case WPAN_SECURITY_OFF:
			ro->secen_override = 1;
			ro->secen = 0;
			break;
		default:
			err = -EINVAL;
			break;
		}
		break;
	case WPAN_SECURITY_LEVEL:
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
		    !ns_capable(net->user_ns, CAP_NET_RAW)) {
			err = -EPERM;
			break;
		}

		if (val < WPAN_SECURITY_LEVEL_DEFAULT ||
		    val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
			err = -EINVAL;
		} else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
			ro->seclevel_override = 0;
		} else {
			ro->seclevel_override = 1;
			ro->seclevel = 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	*
9ec76716 SL	15	* Written by:
	16	* Sergey Lapin <slapin@ossfans.org>
	17	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	18	*/
	19
af9eed5b	20	#include <linux/capability.h>
9ec76716 SL	21	#include <linux/net.h>
	22	#include <linux/module.h>
	23	#include <linux/if_arp.h>
	24	#include <linux/list.h>
5a0e3ad6	25	#include <linux/slab.h>
4ca24aca	26	#include <linux/ieee802154.h>
9ec76716	27	#include <net/sock.h>
f0166e5e	28	#include <net/af_ieee802154.h>
f0166e5e	29	#include <net/ieee802154_netdev.h>
9ec76716 SL	30
	31	#include <asm/ioctls.h>
	32
	33	#include "af802154.h"
	34
	35	static HLIST_HEAD(dgram_head);
	36	static DEFINE_RWLOCK(dgram_lock);
	37
	38	struct dgram_sock {
	39	struct sock sk;
	40
e6278d92 PB	41	struct ieee802154_addr src_addr;
e6278d92 PB	42	struct ieee802154_addr dst_addr;
74eda55d	43
95c96174	44	unsigned int bound:1;
1cc76e36	45	unsigned int connected:1;
95c96174	46	unsigned int want_ack:1;
af9eed5b PB	47	unsigned int secen:1;
	48	unsigned int secen_override:1;
	49	unsigned int seclevel:3;
	50	unsigned int seclevel_override:1;
9ec76716 SL	51	};
	52
	53	static inline struct dgram_sock dgram_sk(const struct sock sk)
	54	{
	55	return container_of(sk, struct dgram_sock, sk);
	56	}
	57
9ec76716 SL	58	static void dgram_hash(struct sock *sk)
	59	{
	60	write_lock_bh(&dgram_lock);
	61	sk_add_node(sk, &dgram_head);
	62	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
	63	write_unlock_bh(&dgram_lock);
	64	}
	65
	66	static void dgram_unhash(struct sock *sk)
	67	{
	68	write_lock_bh(&dgram_lock);
	69	if (sk_del_node_init(sk))
	70	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
	71	write_unlock_bh(&dgram_lock);
	72	}
	73
	74	static int dgram_init(struct sock *sk)
	75	{
	76	struct dgram_sock *ro = dgram_sk(sk);
	77
99eb8558	78	ro->want_ack = 1;
9ec76716 SL	79	return 0;
	80	}
	81
	82	static void dgram_close(struct sock *sk, long timeout)
	83	{
	84	sk_common_release(sk);
	85	}
	86
	87	static int dgram_bind(struct sock sk, struct sockaddr uaddr, int len)
	88	{
	89	struct sockaddr_ieee802154 addr = (struct sockaddr_ieee802154 )uaddr;
e6278d92	90	struct ieee802154_addr haddr;
9ec76716	91	struct dgram_sock *ro = dgram_sk(sk);
74eda55d	92	int err = -EINVAL;
9ec76716 SL	93	struct net_device *dev;
9ec76716 SL	94
74eda55d DB	95	lock_sock(sk);
74eda55d DB	96
9ec76716 SL	97	ro->bound = 0;
	98
	99	if (len < sizeof(*addr))
74eda55d	100	goto out;
9ec76716 SL	101
9ec76716 SL	102	if (addr->family != AF_IEEE802154)
74eda55d	103	goto out;
9ec76716	104
e6278d92 PB	105	ieee802154_addr_from_sa(&haddr, &addr->addr);
e6278d92 PB	106	dev = ieee802154_get_dev(sock_net(sk), &haddr);
9ec76716 SL	107	if (!dev) {
	108	err = -ENODEV;
	109	goto out;
	110	}
	111
	112	if (dev->type != ARPHRD_IEEE802154) {
	113	err = -ENODEV;
	114	goto out_put;
	115	}
	116
e6278d92	117	ro->src_addr = haddr;
9ec76716 SL	118
9ec76716 SL	119	ro->bound = 1;
74eda55d	120	err = 0;
9ec76716 SL	121	out_put:
	122	dev_put(dev);
	123	out:
	124	release_sock(sk);
	125
	126	return err;
	127	}
	128
	129	static int dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
	130	{
	131	switch (cmd) {
	132	case SIOCOUTQ:
	133	{
31e6d363 ED	134	int amount = sk_wmem_alloc_get(sk);
31e6d363 ED	135
9ec76716 SL	136	return put_user(amount, (int __user *)arg);
	137	}
	138
	139	case SIOCINQ:
	140	{
	141	struct sk_buff *skb;
	142	unsigned long amount;
	143
	144	amount = 0;
	145	spin_lock_bh(&sk->sk_receive_queue.lock);
	146	skb = skb_peek(&sk->sk_receive_queue);
	147	if (skb != NULL) {
4710d806	148	/* We will only return the amount
9ec76716 SL	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	}
4710d806	159
9ec76716 SL	160	return -ENOIOCTLCMD;
	161	}
	162
	163	/* FIXME: autobind */
	164	static int dgram_connect(struct sock sk, struct sockaddr uaddr,
4710d806	165	int len)
9ec76716 SL	166	{
	167	struct sockaddr_ieee802154 addr = (struct sockaddr_ieee802154 )uaddr;
	168	struct dgram_sock *ro = dgram_sk(sk);
	169	int err = 0;
	170
	171	if (len < sizeof(*addr))
	172	return -EINVAL;
	173
	174	if (addr->family != AF_IEEE802154)
	175	return -EINVAL;
	176
	177	lock_sock(sk);
	178
	179	if (!ro->bound) {
	180	err = -ENETUNREACH;
	181	goto out;
	182	}
	183
e6278d92	184	ieee802154_addr_from_sa(&ro->dst_addr, &addr->addr);
1cc76e36	185	ro->connected = 1;
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);
1cc76e36	197	ro->connected = 0;
9ec76716 SL	198	release_sock(sk);
	199
	200	return 0;
	201	}
	202
	203	static int dgram_sendmsg(struct kiocb iocb, struct sock sk,
4710d806	204	struct msghdr *msg, size_t size)
9ec76716 SL	205	{
9ec76716 SL	206	struct net_device *dev;
95c96174	207	unsigned int mtu;
9ec76716	208	struct sk_buff *skb;
32edc40a	209	struct ieee802154_mac_cb *cb;
9ec76716	210	struct dgram_sock *ro = dgram_sk(sk);
1cc76e36	211	struct ieee802154_addr dst_addr;
ae641949	212	int hlen, tlen;
9ec76716 SL	213	int err;
	214
	215	if (msg->msg_flags & MSG_OOB) {
	216	pr_debug("msg->msg_flags = 0x%x\n", msg->msg_flags);
	217	return -EOPNOTSUPP;
	218	}
	219
1cc76e36 PB	220	if (!ro->connected && !msg->msg_name)
	221	return -EDESTADDRREQ;
	222	else if (ro->connected && msg->msg_name)
	223	return -EISCONN;
	224
9ec76716 SL	225	if (!ro->bound)
	226	dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
	227	else
	228	dev = ieee802154_get_dev(sock_net(sk), &ro->src_addr);
	229
	230	if (!dev) {
	231	pr_debug("no dev\n");
	232	err = -ENXIO;
	233	goto out;
	234	}
	235	mtu = dev->mtu;
	236	pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
	237
3da947b2 SL	238	if (size > mtu) {
3da947b2 SL	239	pr_debug("size = %Zu, mtu = %u\n", size, mtu);
d1d7358e	240	err = -EMSGSIZE;
3da947b2 SL	241	goto out_dev;
	242	}
	243
ae641949 HX	244	hlen = LL_RESERVED_SPACE(dev);
	245	tlen = dev->needed_tailroom;
	246	skb = sock_alloc_send_skb(sk, hlen + tlen + size,
4710d806 VB	247	msg->msg_flags & MSG_DONTWAIT,
4710d806 VB	248	&err);
9ec76716 SL	249	if (!skb)
	250	goto out_dev;
	251
ae641949	252	skb_reserve(skb, hlen);
9ec76716 SL	253
	254	skb_reset_network_header(skb);
	255
32edc40a PB	256	cb = mac_cb_init(skb);
	257	cb->type = IEEE802154_FC_TYPE_DATA;
	258	cb->ackreq = ro->want_ack;
99eb8558	259
1cc76e36	260	if (msg->msg_name) {
4710d806 VB	261	DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
4710d806 VB	262	daddr, msg->msg_name);
1cc76e36 PB	263
	264	ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
	265	} else {
	266	dst_addr = ro->dst_addr;
	267	}
	268
af9eed5b PB	269	cb->secen = ro->secen;
	270	cb->secen_override = ro->secen_override;
	271	cb->seclevel = ro->seclevel;
	272	cb->seclevel_override = ro->seclevel_override;
	273
1cc76e36 PB	274	err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
1cc76e36 PB	275	ro->bound ? &ro->src_addr : NULL, size);
9ec76716 SL	276	if (err < 0)
	277	goto out_skb;
	278
6ce8e9ce	279	err = memcpy_from_msg(skb_put(skb, size), msg, size);
9ec76716 SL	280	if (err < 0)
	281	goto out_skb;
	282
9ec76716 SL	283	skb->dev = dev;
	284	skb->sk = sk;
	285	skb->protocol = htons(ETH_P_IEEE802154);
	286
	287	dev_put(dev);
	288
	289	err = dev_queue_xmit(skb);
	290	if (err > 0)
	291	err = net_xmit_errno(err);
	292
	293	return err ?: size;
	294
	295	out_skb:
	296	kfree_skb(skb);
	297	out_dev:
	298	dev_put(dev);
	299	out:
	300	return err;
	301	}
	302
	303	static int dgram_recvmsg(struct kiocb iocb, struct sock sk,
4710d806 VB	304	struct msghdr *msg, size_t len, int noblock,
4710d806 VB	305	int flags, int *addr_len)
9ec76716 SL	306	{
	307	size_t copied = 0;
	308	int err = -EOPNOTSUPP;
	309	struct sk_buff *skb;
342dfc30	310	DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
9ec76716 SL	311
	312	skb = skb_recv_datagram(sk, flags, noblock, &err);
	313	if (!skb)
	314	goto out;
	315
	316	copied = skb->len;
	317	if (len < copied) {
	318	msg->msg_flags \|= MSG_TRUNC;
	319	copied = len;
	320	}
	321
	322	/* FIXME: skip headers if necessary ?! */
51f3d02b	323	err = skb_copy_datagram_msg(skb, 0, msg, copied);
9ec76716 SL	324	if (err)
	325	goto done;
	326
3b885787	327	sock_recv_ts_and_drops(msg, sk, skb);
9ec76716	328
6364e6ee SR	329	if (saddr) {
6364e6ee SR	330	saddr->family = AF_IEEE802154;
ae531b94	331	ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
6364e6ee	332	addr_len = sizeof(saddr);
bceaa902	333	}
6364e6ee	334
9ec76716 SL	335	if (flags & MSG_TRUNC)
	336	copied = skb->len;
	337	done:
	338	skb_free_datagram(sk, skb);
	339	out:
	340	if (err)
	341	return err;
	342	return copied;
	343	}
	344
	345	static int dgram_rcv_skb(struct sock sk, struct sk_buff skb)
	346	{
8cfad496 PB	347	skb = skb_share_check(skb, GFP_ATOMIC);
	348	if (!skb)
	349	return NET_RX_DROP;
	350
9ec76716	351	if (sock_queue_rcv_skb(sk, skb) < 0) {
9ec76716 SL	352	kfree_skb(skb);
	353	return NET_RX_DROP;
	354	}
	355
	356	return NET_RX_SUCCESS;
	357	}
	358
e6278d92 PB	359	static inline bool
	360	ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
	361	struct dgram_sock *ro)
9ec76716 SL	362	{
9ec76716 SL	363	if (!ro->bound)
e6278d92	364	return true;
9ec76716	365
e6278d92 PB	366	if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
	367	hw_addr == ro->src_addr.extended_addr)
	368	return true;
9ec76716	369
e6278d92 PB	370	if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
	371	pan_id == ro->src_addr.pan_id &&
	372	short_addr == ro->src_addr.short_addr)
	373	return true;
9ec76716	374
e6278d92	375	return false;
9ec76716 SL	376	}
	377
	378	int ieee802154_dgram_deliver(struct net_device dev, struct sk_buff skb)
	379	{
	380	struct sock sk, prev = NULL;
9ec76716	381	int ret = NET_RX_SUCCESS;
e6278d92 PB	382	__le16 pan_id, short_addr;
e6278d92 PB	383	__le64 hw_addr;
9ec76716 SL	384
	385	/* Data frame processing */
	386	BUG_ON(dev->type != ARPHRD_IEEE802154);
	387
e6278d92 PB	388	pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
	389	short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
	390	hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);
9ec76716 SL	391
9ec76716 SL	392	read_lock(&dgram_lock);
b67bfe0d	393	sk_for_each(sk, &dgram_head) {
e6278d92 PB	394	if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
e6278d92 PB	395	dgram_sk(sk))) {
9ec76716 SL	396	if (prev) {
9ec76716 SL	397	struct sk_buff *clone;
4710d806	398
9ec76716 SL	399	clone = skb_clone(skb, GFP_ATOMIC);
	400	if (clone)
	401	dgram_rcv_skb(prev, clone);
	402	}
	403
	404	prev = sk;
	405	}
	406	}
	407
4710d806	408	if (prev) {
9ec76716	409	dgram_rcv_skb(prev, skb);
4710d806	410	} else {
9ec76716 SL	411	kfree_skb(skb);
	412	ret = NET_RX_DROP;
	413	}
	414	read_unlock(&dgram_lock);
	415
	416	return ret;
	417	}
	418
a9dfac33	419	static int dgram_getsockopt(struct sock *sk, int level, int optname,
4710d806	420	char __user optval, int __user optlen)
a9dfac33	421	{
99eb8558 DB	422	struct dgram_sock *ro = dgram_sk(sk);
	423
	424	int val, len;
	425
	426	if (level != SOL_IEEE802154)
	427	return -EOPNOTSUPP;
	428
	429	if (get_user(len, optlen))
	430	return -EFAULT;
	431
	432	len = min_t(unsigned int, len, sizeof(int));
	433
	434	switch (optname) {
	435	case WPAN_WANTACK:
	436	val = ro->want_ack;
	437	break;
af9eed5b PB	438	case WPAN_SECURITY:
	439	if (!ro->secen_override)
	440	val = WPAN_SECURITY_DEFAULT;
	441	else if (ro->secen)
	442	val = WPAN_SECURITY_ON;
	443	else
	444	val = WPAN_SECURITY_OFF;
	445	break;
	446	case WPAN_SECURITY_LEVEL:
	447	if (!ro->seclevel_override)
	448	val = WPAN_SECURITY_LEVEL_DEFAULT;
	449	else
	450	val = ro->seclevel;
	451	break;
99eb8558 DB	452	default:
	453	return -ENOPROTOOPT;
	454	}
	455
	456	if (put_user(len, optlen))
	457	return -EFAULT;
	458	if (copy_to_user(optval, &val, len))
	459	return -EFAULT;
	460	return 0;
a9dfac33 DES	461	}
	462
	463	static int dgram_setsockopt(struct sock *sk, int level, int optname,
4710d806	464	char __user *optval, unsigned int optlen)
a9dfac33	465	{
99eb8558	466	struct dgram_sock *ro = dgram_sk(sk);
af9eed5b	467	struct net *net = sock_net(sk);
99eb8558 DB	468	int val;
	469	int err = 0;
	470
	471	if (optlen < sizeof(int))
	472	return -EINVAL;
	473
	474	if (get_user(val, (int __user *)optval))
	475	return -EFAULT;
	476
	477	lock_sock(sk);
	478
	479	switch (optname) {
	480	case WPAN_WANTACK:
	481	ro->want_ack = !!val;
	482	break;
af9eed5b PB	483	case WPAN_SECURITY:
	484	if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
	485	!ns_capable(net->user_ns, CAP_NET_RAW)) {
	486	err = -EPERM;
	487	break;
	488	}
	489
	490	switch (val) {
	491	case WPAN_SECURITY_DEFAULT:
	492	ro->secen_override = 0;
	493	break;
	494	case WPAN_SECURITY_ON:
	495	ro->secen_override = 1;
	496	ro->secen = 1;
	497	break;
	498	case WPAN_SECURITY_OFF:
	499	ro->secen_override = 1;
	500	ro->secen = 0;
	501	break;
	502	default:
	503	err = -EINVAL;
	504	break;
	505	}
	506	break;
	507	case WPAN_SECURITY_LEVEL:
	508	if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
	509	!ns_capable(net->user_ns, CAP_NET_RAW)) {
	510	err = -EPERM;
	511	break;
	512	}
	513
	514	if (val < WPAN_SECURITY_LEVEL_DEFAULT \|\|
	515	val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
	516	err = -EINVAL;
	517	} else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
	518	ro->seclevel_override = 0;
	519	} else {
	520	ro->seclevel_override = 1;
	521	ro->seclevel = val;
	522	}
	523	break;
99eb8558 DB	524	default:
	525	err = -ENOPROTOOPT;
	526	break;
	527	}
	528
	529	release_sock(sk);
	530	return err;
a9dfac33 DES	531	}
a9dfac33 DES	532
9ec76716 SL	533	struct proto ieee802154_dgram_prot = {
	534	.name = "IEEE-802.15.4-MAC",
	535	.owner = THIS_MODULE,
	536	.obj_size = sizeof(struct dgram_sock),
	537	.init = dgram_init,
	538	.close = dgram_close,
	539	.bind = dgram_bind,
	540	.sendmsg = dgram_sendmsg,
	541	.recvmsg = dgram_recvmsg,
	542	.hash = dgram_hash,
	543	.unhash = dgram_unhash,
	544	.connect = dgram_connect,
	545	.disconnect = dgram_disconnect,
	546	.ioctl = dgram_ioctl,
a9dfac33 DES	547	.getsockopt = dgram_getsockopt,
a9dfac33 DES	548	.setsockopt = dgram_setsockopt,
9ec76716 SL	549	};
9ec76716 SL	550