[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	}
9ec76716	157	}
4710d806	158
9ec76716 SL	159	return -ENOIOCTLCMD;
	160	}
	161
	162	/* FIXME: autobind */
	163	static int dgram_connect(struct sock sk, struct sockaddr uaddr,
4710d806	164	int len)
9ec76716 SL	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,
4710d806	203	struct msghdr *msg, size_t size)
9ec76716 SL	204	{
9ec76716 SL	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,
4710d806 VB	246	msg->msg_flags & MSG_DONTWAIT,
4710d806 VB	247	&err);
9ec76716 SL	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	259	if (msg->msg_name) {
4710d806 VB	260	DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
4710d806 VB	261	daddr, msg->msg_name);
1cc76e36 PB	262
	263	ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
	264	} else {
	265	dst_addr = ro->dst_addr;
	266	}
	267
af9eed5b PB	268	cb->secen = ro->secen;
	269	cb->secen_override = ro->secen_override;
	270	cb->seclevel = ro->seclevel;
	271	cb->seclevel_override = ro->seclevel_override;
	272
1cc76e36 PB	273	err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &dst_addr,
1cc76e36 PB	274	ro->bound ? &ro->src_addr : NULL, size);
9ec76716 SL	275	if (err < 0)
	276	goto out_skb;
	277
6ce8e9ce	278	err = memcpy_from_msg(skb_put(skb, size), msg, size);
9ec76716 SL	279	if (err < 0)
	280	goto out_skb;
	281
9ec76716 SL	282	skb->dev = dev;
	283	skb->sk = sk;
	284	skb->protocol = htons(ETH_P_IEEE802154);
	285
	286	dev_put(dev);
	287
	288	err = dev_queue_xmit(skb);
	289	if (err > 0)
	290	err = net_xmit_errno(err);
	291
	292	return err ?: size;
	293
	294	out_skb:
	295	kfree_skb(skb);
	296	out_dev:
	297	dev_put(dev);
	298	out:
	299	return err;
	300	}
	301
	302	static int dgram_recvmsg(struct kiocb iocb, struct sock sk,
4710d806 VB	303	struct msghdr *msg, size_t len, int noblock,
4710d806 VB	304	int flags, int *addr_len)
9ec76716 SL	305	{
	306	size_t copied = 0;
	307	int err = -EOPNOTSUPP;
	308	struct sk_buff *skb;
342dfc30	309	DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
9ec76716 SL	310
	311	skb = skb_recv_datagram(sk, flags, noblock, &err);
	312	if (!skb)
	313	goto out;
	314
	315	copied = skb->len;
	316	if (len < copied) {
	317	msg->msg_flags \|= MSG_TRUNC;
	318	copied = len;
	319	}
	320
	321	/* FIXME: skip headers if necessary ?! */
51f3d02b	322	err = skb_copy_datagram_msg(skb, 0, msg, copied);
9ec76716 SL	323	if (err)
	324	goto done;
	325
3b885787	326	sock_recv_ts_and_drops(msg, sk, skb);
9ec76716	327
6364e6ee SR	328	if (saddr) {
6364e6ee SR	329	saddr->family = AF_IEEE802154;
ae531b94	330	ieee802154_addr_to_sa(&saddr->addr, &mac_cb(skb)->source);
6364e6ee	331	addr_len = sizeof(saddr);
bceaa902	332	}
6364e6ee	333
9ec76716 SL	334	if (flags & MSG_TRUNC)
	335	copied = skb->len;
	336	done:
	337	skb_free_datagram(sk, skb);
	338	out:
	339	if (err)
	340	return err;
	341	return copied;
	342	}
	343
	344	static int dgram_rcv_skb(struct sock sk, struct sk_buff skb)
	345	{
8cfad496 PB	346	skb = skb_share_check(skb, GFP_ATOMIC);
	347	if (!skb)
	348	return NET_RX_DROP;
	349
9ec76716	350	if (sock_queue_rcv_skb(sk, skb) < 0) {
9ec76716 SL	351	kfree_skb(skb);
	352	return NET_RX_DROP;
	353	}
	354
	355	return NET_RX_SUCCESS;
	356	}
	357
e6278d92 PB	358	static inline bool
	359	ieee802154_match_sock(__le64 hw_addr, __le16 pan_id, __le16 short_addr,
	360	struct dgram_sock *ro)
9ec76716 SL	361	{
9ec76716 SL	362	if (!ro->bound)
e6278d92	363	return true;
9ec76716	364
e6278d92 PB	365	if (ro->src_addr.mode == IEEE802154_ADDR_LONG &&
	366	hw_addr == ro->src_addr.extended_addr)
	367	return true;
9ec76716	368
e6278d92 PB	369	if (ro->src_addr.mode == IEEE802154_ADDR_SHORT &&
	370	pan_id == ro->src_addr.pan_id &&
	371	short_addr == ro->src_addr.short_addr)
	372	return true;
9ec76716	373
e6278d92	374	return false;
9ec76716 SL	375	}
	376
	377	int ieee802154_dgram_deliver(struct net_device dev, struct sk_buff skb)
	378	{
	379	struct sock sk, prev = NULL;
9ec76716	380	int ret = NET_RX_SUCCESS;
e6278d92 PB	381	__le16 pan_id, short_addr;
e6278d92 PB	382	__le64 hw_addr;
9ec76716 SL	383
	384	/* Data frame processing */
	385	BUG_ON(dev->type != ARPHRD_IEEE802154);
	386
e6278d92 PB	387	pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
	388	short_addr = ieee802154_mlme_ops(dev)->get_short_addr(dev);
	389	hw_addr = ieee802154_devaddr_from_raw(dev->dev_addr);
9ec76716 SL	390
9ec76716 SL	391	read_lock(&dgram_lock);
b67bfe0d	392	sk_for_each(sk, &dgram_head) {
e6278d92 PB	393	if (ieee802154_match_sock(hw_addr, pan_id, short_addr,
e6278d92 PB	394	dgram_sk(sk))) {
9ec76716 SL	395	if (prev) {
9ec76716 SL	396	struct sk_buff *clone;
4710d806	397
9ec76716 SL	398	clone = skb_clone(skb, GFP_ATOMIC);
	399	if (clone)
	400	dgram_rcv_skb(prev, clone);
	401	}
	402
	403	prev = sk;
	404	}
	405	}
	406
4710d806	407	if (prev) {
9ec76716	408	dgram_rcv_skb(prev, skb);
4710d806	409	} else {
9ec76716 SL	410	kfree_skb(skb);
	411	ret = NET_RX_DROP;
	412	}
	413	read_unlock(&dgram_lock);
	414
	415	return ret;
	416	}
	417
a9dfac33	418	static int dgram_getsockopt(struct sock *sk, int level, int optname,
4710d806	419	char __user optval, int __user optlen)
a9dfac33	420	{
99eb8558 DB	421	struct dgram_sock *ro = dgram_sk(sk);
	422
	423	int val, len;
	424
	425	if (level != SOL_IEEE802154)
	426	return -EOPNOTSUPP;
	427
	428	if (get_user(len, optlen))
	429	return -EFAULT;
	430
	431	len = min_t(unsigned int, len, sizeof(int));
	432
	433	switch (optname) {
	434	case WPAN_WANTACK:
	435	val = ro->want_ack;
	436	break;
af9eed5b PB	437	case WPAN_SECURITY:
	438	if (!ro->secen_override)
	439	val = WPAN_SECURITY_DEFAULT;
	440	else if (ro->secen)
	441	val = WPAN_SECURITY_ON;
	442	else
	443	val = WPAN_SECURITY_OFF;
	444	break;
	445	case WPAN_SECURITY_LEVEL:
	446	if (!ro->seclevel_override)
	447	val = WPAN_SECURITY_LEVEL_DEFAULT;
	448	else
	449	val = ro->seclevel;
	450	break;
99eb8558 DB	451	default:
	452	return -ENOPROTOOPT;
	453	}
	454
	455	if (put_user(len, optlen))
	456	return -EFAULT;
	457	if (copy_to_user(optval, &val, len))
	458	return -EFAULT;
	459	return 0;
a9dfac33 DES	460	}
	461
	462	static int dgram_setsockopt(struct sock *sk, int level, int optname,
4710d806	463	char __user *optval, unsigned int optlen)
a9dfac33	464	{
99eb8558	465	struct dgram_sock *ro = dgram_sk(sk);
af9eed5b	466	struct net *net = sock_net(sk);
99eb8558 DB	467	int val;
	468	int err = 0;
	469
	470	if (optlen < sizeof(int))
	471	return -EINVAL;
	472
	473	if (get_user(val, (int __user *)optval))
	474	return -EFAULT;
	475
	476	lock_sock(sk);
	477
	478	switch (optname) {
	479	case WPAN_WANTACK:
	480	ro->want_ack = !!val;
	481	break;
af9eed5b PB	482	case WPAN_SECURITY:
	483	if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
	484	!ns_capable(net->user_ns, CAP_NET_RAW)) {
	485	err = -EPERM;
	486	break;
	487	}
	488
	489	switch (val) {
	490	case WPAN_SECURITY_DEFAULT:
	491	ro->secen_override = 0;
	492	break;
	493	case WPAN_SECURITY_ON:
	494	ro->secen_override = 1;
	495	ro->secen = 1;
	496	break;
	497	case WPAN_SECURITY_OFF:
	498	ro->secen_override = 1;
	499	ro->secen = 0;
	500	break;
	501	default:
	502	err = -EINVAL;
	503	break;
	504	}
	505	break;
	506	case WPAN_SECURITY_LEVEL:
	507	if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
	508	!ns_capable(net->user_ns, CAP_NET_RAW)) {
	509	err = -EPERM;
	510	break;
	511	}
	512
	513	if (val < WPAN_SECURITY_LEVEL_DEFAULT \|\|
	514	val > IEEE802154_SCF_SECLEVEL_ENC_MIC128) {
	515	err = -EINVAL;
	516	} else if (val == WPAN_SECURITY_LEVEL_DEFAULT) {
	517	ro->seclevel_override = 0;
	518	} else {
	519	ro->seclevel_override = 1;
	520	ro->seclevel = val;
	521	}
	522	break;
99eb8558 DB	523	default:
	524	err = -ENOPROTOOPT;
	525	break;
	526	}
	527
	528	release_sock(sk);
	529	return err;
a9dfac33 DES	530	}
a9dfac33 DES	531
9ec76716 SL	532	struct proto ieee802154_dgram_prot = {
	533	.name = "IEEE-802.15.4-MAC",
	534	.owner = THIS_MODULE,
	535	.obj_size = sizeof(struct dgram_sock),
	536	.init = dgram_init,
	537	.close = dgram_close,
	538	.bind = dgram_bind,
	539	.sendmsg = dgram_sendmsg,
	540	.recvmsg = dgram_recvmsg,
	541	.hash = dgram_hash,
	542	.unhash = dgram_unhash,
	543	.connect = dgram_connect,
	544	.disconnect = dgram_disconnect,
	545	.ioctl = dgram_ioctl,
a9dfac33 DES	546	.getsockopt = dgram_getsockopt,
a9dfac33 DES	547	.setsockopt = dgram_setsockopt,
9ec76716 SL	548	};
9ec76716 SL	549