[mirror_ubuntu-zesty-kernel.git] / net / mac802154 / iface.c

/*
 * Copyright 2007-2012 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:
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Sergey Lapin <slapin@ossfans.org>
 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/ieee802154.h>

#include <net/rtnetlink.h>
#include <linux/nl802154.h>
#include <net/af_ieee802154.h>
#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
#include <net/cfg802154.h>

#include "ieee802154_i.h"
#include "driver-ops.h"

static int mac802154_wpan_update_llsec(struct net_device *dev)
{
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
	int rc = 0;

	if (ops->llsec) {
		struct ieee802154_llsec_params params;
		int changed = 0;

		params.pan_id = sdata->pan_id;
		changed |= IEEE802154_LLSEC_PARAM_PAN_ID;

		params.hwaddr = sdata->extended_addr;
		changed |= IEEE802154_LLSEC_PARAM_HWADDR;

		rc = ops->llsec->set_params(dev, &params, changed);
	}

	return rc;
}

static int
mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct sockaddr_ieee802154 *sa =
		(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
	int err = -ENOIOCTLCMD;

	spin_lock_bh(&sdata->mib_lock);

	switch (cmd) {
	case SIOCGIFADDR:
	{
		u16 pan_id, short_addr;

		pan_id = le16_to_cpu(sdata->pan_id);
		short_addr = le16_to_cpu(sdata->short_addr);
		if (pan_id == IEEE802154_PANID_BROADCAST ||
		    short_addr == IEEE802154_ADDR_BROADCAST) {
			err = -EADDRNOTAVAIL;
			break;
		}

		sa->family = AF_IEEE802154;
		sa->addr.addr_type = IEEE802154_ADDR_SHORT;
		sa->addr.pan_id = pan_id;
		sa->addr.short_addr = short_addr;

		err = 0;
		break;
	}
	case SIOCSIFADDR:
		dev_warn(&dev->dev,
			 "Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
		if (sa->family != AF_IEEE802154 ||
		    sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
		    sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
		    sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
		    sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
			err = -EINVAL;
			break;
		}

		sdata->pan_id = cpu_to_le16(sa->addr.pan_id);
		sdata->short_addr = cpu_to_le16(sa->addr.short_addr);

		err = mac802154_wpan_update_llsec(dev);
		break;
	}

	spin_unlock_bh(&sdata->mib_lock);
	return err;
}

static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
{
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct sockaddr *addr = p;
	__le64 extended_addr;

	if (netif_running(dev))
		return -EBUSY;

	ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
	if (!ieee802154_is_valid_extended_addr(extended_addr))
		return -EINVAL;

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	sdata->extended_addr = extended_addr;

	return mac802154_wpan_update_llsec(dev);
}

static int mac802154_slave_open(struct net_device *dev)
{
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct ieee802154_sub_if_data *subif;
	struct ieee802154_local *local = sdata->local;
	int res = 0;

	ASSERT_RTNL();

	if (sdata->vif.type == IEEE802154_DEV_WPAN) {
		mutex_lock(&sdata->local->iflist_mtx);
		list_for_each_entry(subif, &sdata->local->interfaces, list) {
			if (subif != sdata &&
			    subif->vif.type == sdata->vif.type &&
			    ieee802154_sdata_running(subif)) {
				mutex_unlock(&sdata->local->iflist_mtx);
				return -EBUSY;
			}
		}
		mutex_unlock(&sdata->local->iflist_mtx);
	}

	set_bit(SDATA_STATE_RUNNING, &sdata->state);

	if (!local->open_count) {
		res = drv_start(local);
		WARN_ON(res);
		if (res)
			goto err;
	}

	local->open_count++;
	netif_start_queue(dev);
	return 0;
err:
	/* might already be clear but that doesn't matter */
	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

	return res;
}

static int mac802154_wpan_open(struct net_device *dev)
{
	int rc;
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct ieee802154_local *local = sdata->local;
	struct wpan_phy *phy = sdata->local->phy;

	rc = mac802154_slave_open(dev);
	if (rc < 0)
		return rc;

	mutex_lock(&phy->pib_lock);

	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
		rc = drv_set_promiscuous_mode(local, sdata->promisuous_mode);
		if (rc < 0)
			goto out;
	}

	if (local->hw.flags & IEEE802154_HW_AFILT) {
		rc = drv_set_pan_id(local, sdata->pan_id);
		if (rc < 0)
			goto out;

		rc = drv_set_extended_addr(local, sdata->extended_addr);
		if (rc < 0)
			goto out;

		rc = drv_set_short_addr(local, sdata->short_addr);
		if (rc < 0)
			goto out;
	}

	if (local->hw.flags & IEEE802154_HW_LBT) {
		rc = drv_set_lbt_mode(local, sdata->mac_params.lbt);
		if (rc < 0)
			goto out;
	}

	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
		rc = drv_set_csma_params(local, sdata->mac_params.min_be,
					 sdata->mac_params.max_be,
					 sdata->mac_params.csma_retries);
		if (rc < 0)
			goto out;
	}

	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
		rc = drv_set_max_frame_retries(local,
					       sdata->mac_params.frame_retries);
		if (rc < 0)
			goto out;
	}

	mutex_unlock(&phy->pib_lock);
	return 0;

out:
	mutex_unlock(&phy->pib_lock);
	return rc;
}

static int mac802154_slave_close(struct net_device *dev)
{
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct ieee802154_local *local = sdata->local;

	ASSERT_RTNL();

	netif_stop_queue(dev);
	local->open_count--;

	clear_bit(SDATA_STATE_RUNNING, &sdata->state);

	if (!local->open_count)
		drv_stop(local);

	return 0;
}

static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
					 struct ieee802154_hdr *hdr,
					 const struct ieee802154_mac_cb *cb)
{
	struct ieee802154_llsec_params params;
	u8 level;

	mac802154_llsec_get_params(&sdata->sec, &params);

	if (!params.enabled && cb->secen_override && cb->secen)
		return -EINVAL;
	if (!params.enabled ||
	    (cb->secen_override && !cb->secen) ||
	    !params.out_level)
		return 0;
	if (cb->seclevel_override && !cb->seclevel)
		return -EINVAL;

	level = cb->seclevel_override ? cb->seclevel : params.out_level;

	hdr->fc.security_enabled = 1;
	hdr->sec.level = level;
	hdr->sec.key_id_mode = params.out_key.mode;
	if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
		hdr->sec.short_src = params.out_key.short_source;
	else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
		hdr->sec.extended_src = params.out_key.extended_source;
	hdr->sec.key_id = params.out_key.id;

	return 0;
}

static int mac802154_header_create(struct sk_buff *skb,
				   struct net_device *dev,
				   unsigned short type,
				   const void *daddr,
				   const void *saddr,
				   unsigned len)
{
	struct ieee802154_hdr hdr;
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	struct ieee802154_mac_cb *cb = mac_cb(skb);
	int hlen;

	if (!daddr)
		return -EINVAL;

	memset(&hdr.fc, 0, sizeof(hdr.fc));
	hdr.fc.type = cb->type;
	hdr.fc.security_enabled = cb->secen;
	hdr.fc.ack_request = cb->ackreq;
	hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);

	if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
		return -EINVAL;

	if (!saddr) {
		spin_lock_bh(&sdata->mib_lock);

		if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
		    sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
		    sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
			hdr.source.mode = IEEE802154_ADDR_LONG;
			hdr.source.extended_addr = sdata->extended_addr;
		} else {
			hdr.source.mode = IEEE802154_ADDR_SHORT;
			hdr.source.short_addr = sdata->short_addr;
		}

		hdr.source.pan_id = sdata->pan_id;

		spin_unlock_bh(&sdata->mib_lock);
	} else {
		hdr.source = *(const struct ieee802154_addr *)saddr;
	}

	hdr.dest = *(const struct ieee802154_addr *)daddr;

	hlen = ieee802154_hdr_push(skb, &hdr);
	if (hlen < 0)
		return -EINVAL;

	skb_reset_mac_header(skb);
	skb->mac_len = hlen;

	if (len > ieee802154_max_payload(&hdr))
		return -EMSGSIZE;

	return hlen;
}

static int
mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
	struct ieee802154_hdr hdr;
	struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;

	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
		pr_debug("malformed packet\n");
		return 0;
	}

	*addr = hdr.source;
	return sizeof(*addr);
}

static struct header_ops mac802154_header_ops = {
	.create		= mac802154_header_create,
	.parse		= mac802154_header_parse,
};

static const struct net_device_ops mac802154_wpan_ops = {
	.ndo_open		= mac802154_wpan_open,
	.ndo_stop		= mac802154_slave_close,
	.ndo_start_xmit		= ieee802154_subif_start_xmit,
	.ndo_do_ioctl		= mac802154_wpan_ioctl,
	.ndo_set_mac_address	= mac802154_wpan_mac_addr,
};

static const struct net_device_ops mac802154_monitor_ops = {
	.ndo_open		= mac802154_wpan_open,
	.ndo_stop		= mac802154_slave_close,
	.ndo_start_xmit		= ieee802154_monitor_start_xmit,
};

static void mac802154_wpan_free(struct net_device *dev)
{
	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);

	mac802154_llsec_destroy(&sdata->sec);

	free_netdev(dev);
}

static void ieee802154_if_setup(struct net_device *dev)
{
	dev->addr_len		= IEEE802154_ADDR_LEN;
	memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);

	dev->hard_header_len	= MAC802154_FRAME_HARD_HEADER_LEN;
	dev->needed_tailroom	= 2 + 16; /* FCS + MIC */
	dev->mtu		= IEEE802154_MTU;
	dev->tx_queue_len	= 300;
	dev->flags		= IFF_NOARP | IFF_BROADCAST;
}

static int
ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata, int type)
{
	/* set some type-dependent values */
	sdata->vif.type = type;

	get_random_bytes(&sdata->bsn, 1);
	get_random_bytes(&sdata->dsn, 1);

	/* defaults per 802.15.4-2011 */
	sdata->mac_params.min_be = 3;
	sdata->mac_params.max_be = 5;
	sdata->mac_params.csma_retries = 4;
	/* for compatibility, actual default is 3 */
	sdata->mac_params.frame_retries = -1;

	ieee802154_be64_to_le64(&sdata->extended_addr, sdata->dev->dev_addr);
	sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
	sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);

	switch (type) {
	case IEEE802154_DEV_WPAN:
		sdata->dev->header_ops = &mac802154_header_ops;
		sdata->dev->destructor = mac802154_wpan_free;
		sdata->dev->netdev_ops = &mac802154_wpan_ops;
		sdata->dev->ml_priv = &mac802154_mlme_wpan;
		sdata->promisuous_mode = false;

		spin_lock_init(&sdata->mib_lock);
		mutex_init(&sdata->sec_mtx);

		mac802154_llsec_init(&sdata->sec);
		break;
	case IEEE802154_DEV_MONITOR:
		sdata->dev->destructor = free_netdev;
		sdata->dev->netdev_ops = &mac802154_monitor_ops;
		sdata->promisuous_mode = true;
		break;
	default:
		BUG();
	}

	return 0;
}

struct net_device *
ieee802154_if_add(struct ieee802154_local *local, const char *name,
		  struct wpan_dev **new_wpan_dev, int type)
{
	struct net_device *ndev = NULL;
	struct ieee802154_sub_if_data *sdata = NULL;
	int ret = -ENOMEM;

	ASSERT_RTNL();

	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
			    NET_NAME_UNKNOWN, ieee802154_if_setup);
	if (!ndev)
		return ERR_PTR(-ENOMEM);

	ndev->needed_headroom = local->hw.extra_tx_headroom;

	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
		goto err;

	switch (type) {
	case IEEE802154_DEV_WPAN:
		ndev->type = ARPHRD_IEEE802154;
		break;
	case IEEE802154_DEV_MONITOR:
		ndev->type = ARPHRD_IEEE802154_MONITOR;
		break;
	default:
		ret = -EINVAL;
		goto err;
	}

	ieee802154_le64_to_be64(ndev->perm_addr,
				&local->hw.phy->perm_extended_addr);
	memcpy(ndev->dev_addr, ndev->perm_addr, IEEE802154_EXTENDED_ADDR_LEN);
	/* TODO check this */
	SET_NETDEV_DEV(ndev, &local->phy->dev);
	sdata = netdev_priv(ndev);
	ndev->ieee802154_ptr = &sdata->wpan_dev;
	memcpy(sdata->name, ndev->name, IFNAMSIZ);
	sdata->dev = ndev;
	sdata->wpan_dev.wpan_phy = local->hw.phy;
	sdata->local = local;

	/* setup type-dependent data */
	ret = ieee802154_setup_sdata(sdata, type);
	if (ret)
		goto err;

	if (ndev) {
		ret = register_netdevice(ndev);
		if (ret < 0)
			goto err;
	}

	mutex_lock(&local->iflist_mtx);
	list_add_tail_rcu(&sdata->list, &local->interfaces);
	mutex_unlock(&local->iflist_mtx);

	if (new_wpan_dev)
		*new_wpan_dev = &sdata->wpan_dev;

	return ndev;

err:
	free_netdev(ndev);
	return ERR_PTR(ret);
}

void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
{
	ASSERT_RTNL();

	mutex_lock(&sdata->local->iflist_mtx);
	list_del_rcu(&sdata->list);
	mutex_unlock(&sdata->local->iflist_mtx);

	synchronize_rcu();
	unregister_netdevice(sdata->dev);
}
Commit	Line	Data
32bad7e3	1	/*
	2	* Copyright 2007-2012 Siemens AG
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
32bad7e3	13	* Written by:
	14	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	15	* Sergey Lapin <slapin@ossfans.org>
	16	* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
	17	* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	18	*/
	19
	20	#include <linux/netdevice.h>
	21	#include <linux/module.h>
	22	#include <linux/if_arp.h>
4ca24aca	23	#include <linux/ieee802154.h>
32bad7e3	24
	25	#include <net/rtnetlink.h>
	26	#include <linux/nl802154.h>
	27	#include <net/af_ieee802154.h>
	28	#include <net/mac802154.h>
	29	#include <net/ieee802154_netdev.h>
5ad60d36	30	#include <net/cfg802154.h>
32bad7e3	31
0f1556bc	32	#include "ieee802154_i.h"
59cb300f	33	#include "driver-ops.h"
32bad7e3	34
9b0bb4a8 PB	35	static int mac802154_wpan_update_llsec(struct net_device *dev)
9b0bb4a8 PB	36	{
59d19cd7	37	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
9b0bb4a8 PB	38	struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
	39	int rc = 0;
	40
	41	if (ops->llsec) {
	42	struct ieee802154_llsec_params params;
	43	int changed = 0;
	44
036562f9	45	params.pan_id = sdata->pan_id;
9b0bb4a8 PB	46	changed \|= IEEE802154_LLSEC_PARAM_PAN_ID;
9b0bb4a8 PB	47
036562f9	48	params.hwaddr = sdata->extended_addr;
9b0bb4a8 PB	49	changed \|= IEEE802154_LLSEC_PARAM_HWADDR;
	50
	51	rc = ops->llsec->set_params(dev, &params, changed);
	52	}
	53
	54	return rc;
	55	}
	56
32bad7e3	57	static int
	58	mac802154_wpan_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	59	{
59d19cd7	60	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
32bad7e3	61	struct sockaddr_ieee802154 *sa =
	62	(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
	63	int err = -ENOIOCTLCMD;
	64
036562f9	65	spin_lock_bh(&sdata->mib_lock);
32bad7e3	66
	67	switch (cmd) {
	68	case SIOCGIFADDR:
b70ab2e8 PB	69	{
	70	u16 pan_id, short_addr;
	71
036562f9 AA	72	pan_id = le16_to_cpu(sdata->pan_id);
036562f9 AA	73	short_addr = le16_to_cpu(sdata->short_addr);
b70ab2e8 PB	74	if (pan_id == IEEE802154_PANID_BROADCAST \|\|
b70ab2e8 PB	75	short_addr == IEEE802154_ADDR_BROADCAST) {
32bad7e3	76	err = -EADDRNOTAVAIL;
	77	break;
	78	}
	79
	80	sa->family = AF_IEEE802154;
	81	sa->addr.addr_type = IEEE802154_ADDR_SHORT;
b70ab2e8 PB	82	sa->addr.pan_id = pan_id;
b70ab2e8 PB	83	sa->addr.short_addr = short_addr;
32bad7e3	84
	85	err = 0;
	86	break;
b70ab2e8	87	}
32bad7e3	88	case SIOCSIFADDR:
32bad7e3	89	dev_warn(&dev->dev,
9b13494c	90	"Using DEBUGing ioctl SIOCSIFADDR isn't recommended!\n");
32bad7e3	91	if (sa->family != AF_IEEE802154 \|\|
	92	sa->addr.addr_type != IEEE802154_ADDR_SHORT \|\|
	93	sa->addr.pan_id == IEEE802154_PANID_BROADCAST \|\|
	94	sa->addr.short_addr == IEEE802154_ADDR_BROADCAST \|\|
	95	sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
	96	err = -EINVAL;
	97	break;
	98	}
	99
036562f9 AA	100	sdata->pan_id = cpu_to_le16(sa->addr.pan_id);
036562f9 AA	101	sdata->short_addr = cpu_to_le16(sa->addr.short_addr);
32bad7e3	102
9b0bb4a8	103	err = mac802154_wpan_update_llsec(dev);
32bad7e3	104	break;
	105	}
	106
036562f9	107	spin_unlock_bh(&sdata->mib_lock);
32bad7e3	108	return err;
	109	}
	110
	111	static int mac802154_wpan_mac_addr(struct net_device dev, void p)
	112	{
776e59de	113	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
32bad7e3	114	struct sockaddr *addr = p;
ea7053c1	115	__le64 extended_addr;
32bad7e3	116
	117	if (netif_running(dev))
	118	return -EBUSY;
	119
705cbbbe	120	ieee802154_be64_to_le64(&extended_addr, addr->sa_data);
ea7053c1 AA	121	if (!ieee802154_is_valid_extended_addr(extended_addr))
	122	return -EINVAL;
	123
32bad7e3	124	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
ea7053c1	125	sdata->extended_addr = extended_addr;
776e59de	126
9b0bb4a8	127	return mac802154_wpan_update_llsec(dev);
32bad7e3	128	}
32bad7e3	129
19ec690a AA	130	static int mac802154_slave_open(struct net_device *dev)
	131	{
	132	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	133	struct ieee802154_sub_if_data *subif;
	134	struct ieee802154_local *local = sdata->local;
	135	int res = 0;
	136
	137	ASSERT_RTNL();
	138
7c118c1a	139	if (sdata->vif.type == IEEE802154_DEV_WPAN) {
19ec690a AA	140	mutex_lock(&sdata->local->iflist_mtx);
19ec690a AA	141	list_for_each_entry(subif, &sdata->local->interfaces, list) {
7c118c1a AA	142	if (subif != sdata &&
7c118c1a AA	143	subif->vif.type == sdata->vif.type &&
0ea3da64	144	ieee802154_sdata_running(subif)) {
19ec690a AA	145	mutex_unlock(&sdata->local->iflist_mtx);
	146	return -EBUSY;
	147	}
	148	}
	149	mutex_unlock(&sdata->local->iflist_mtx);
	150	}
	151
0ea3da64	152	set_bit(SDATA_STATE_RUNNING, &sdata->state);
19ec690a	153
74457641	154	if (!local->open_count) {
59cb300f	155	res = drv_start(local);
19ec690a AA	156	WARN_ON(res);
	157	if (res)
	158	goto err;
	159	}
	160
74457641	161	local->open_count++;
19ec690a AA	162	netif_start_queue(dev);
	163	return 0;
	164	err:
0ea3da64 AA	165	/* might already be clear but that doesn't matter */
0ea3da64 AA	166	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
19ec690a AA	167
	168	return res;
	169	}
	170
6ef0023a	171	static int mac802154_wpan_open(struct net_device *dev)
e462ded6 PB	172	{
e462ded6 PB	173	int rc;
59d19cd7	174	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
59cb300f	175	struct ieee802154_local *local = sdata->local;
04e850fe	176	struct wpan_phy *phy = sdata->local->phy;
e462ded6 PB	177
	178	rc = mac802154_slave_open(dev);
	179	if (rc < 0)
	180	return rc;
	181
	182	mutex_lock(&phy->pib_lock);
	183
38130c31 AA	184	if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
	185	rc = drv_set_promiscuous_mode(local, sdata->promisuous_mode);
	186	if (rc < 0)
	187	goto out;
	188	}
	189
776e59de	190	if (local->hw.flags & IEEE802154_HW_AFILT) {
50c79075 AA	191	rc = drv_set_pan_id(local, sdata->pan_id);
	192	if (rc < 0)
	193	goto out;
	194
776e59de AA	195	rc = drv_set_extended_addr(local, sdata->extended_addr);
	196	if (rc < 0)
	197	goto out;
78b4bad1 AA	198
	199	rc = drv_set_short_addr(local, sdata->short_addr);
	200	if (rc < 0)
	201	goto out;
776e59de AA	202	}
776e59de AA	203
a543c598	204	if (local->hw.flags & IEEE802154_HW_LBT) {
59cb300f	205	rc = drv_set_lbt_mode(local, sdata->mac_params.lbt);
e462ded6 PB	206	if (rc < 0)
	207	goto out;
	208	}
	209
a543c598	210	if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
59cb300f AA	211	rc = drv_set_csma_params(local, sdata->mac_params.min_be,
	212	sdata->mac_params.max_be,
	213	sdata->mac_params.csma_retries);
e462ded6 PB	214	if (rc < 0)
	215	goto out;
	216	}
	217
a543c598	218	if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
59cb300f AA	219	rc = drv_set_max_frame_retries(local,
59cb300f AA	220	sdata->mac_params.frame_retries);
e462ded6 PB	221	if (rc < 0)
	222	goto out;
	223	}
	224
	225	mutex_unlock(&phy->pib_lock);
	226	return 0;
	227
	228	out:
	229	mutex_unlock(&phy->pib_lock);
	230	return rc;
	231	}
	232
19ec690a AA	233	static int mac802154_slave_close(struct net_device *dev)
	234	{
	235	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	236	struct ieee802154_local *local = sdata->local;
	237
	238	ASSERT_RTNL();
	239
	240	netif_stop_queue(dev);
74457641	241	local->open_count--;
19ec690a	242
0ea3da64	243	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
19ec690a	244
74457641	245	if (!local->open_count)
59cb300f	246	drv_stop(local);
19ec690a AA	247
	248	return 0;
	249	}
	250
036562f9	251	static int mac802154_set_header_security(struct ieee802154_sub_if_data *sdata,
f30be4d5 PB	252	struct ieee802154_hdr *hdr,
	253	const struct ieee802154_mac_cb *cb)
	254	{
	255	struct ieee802154_llsec_params params;
	256	u8 level;
	257
036562f9	258	mac802154_llsec_get_params(&sdata->sec, &params);
f30be4d5 PB	259
	260	if (!params.enabled && cb->secen_override && cb->secen)
	261	return -EINVAL;
	262	if (!params.enabled \|\|
	263	(cb->secen_override && !cb->secen) \|\|
	264	!params.out_level)
	265	return 0;
	266	if (cb->seclevel_override && !cb->seclevel)
	267	return -EINVAL;
	268
	269	level = cb->seclevel_override ? cb->seclevel : params.out_level;
	270
	271	hdr->fc.security_enabled = 1;
	272	hdr->sec.level = level;
	273	hdr->sec.key_id_mode = params.out_key.mode;
	274	if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
	275	hdr->sec.short_src = params.out_key.short_source;
	276	else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
	277	hdr->sec.extended_src = params.out_key.extended_source;
	278	hdr->sec.key_id = params.out_key.id;
	279
	280	return 0;
	281	}
	282
32bad7e3	283	static int mac802154_header_create(struct sk_buff *skb,
	284	struct net_device *dev,
	285	unsigned short type,
e6278d92 PB	286	const void *daddr,
e6278d92 PB	287	const void *saddr,
32bad7e3	288	unsigned len)
32bad7e3	289	{
e6278d92	290	struct ieee802154_hdr hdr;
59d19cd7	291	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
32edc40a	292	struct ieee802154_mac_cb *cb = mac_cb(skb);
e6278d92	293	int hlen;
32bad7e3	294
	295	if (!daddr)
	296	return -EINVAL;
	297
e6278d92	298	memset(&hdr.fc, 0, sizeof(hdr.fc));
32edc40a PB	299	hdr.fc.type = cb->type;
	300	hdr.fc.security_enabled = cb->secen;
	301	hdr.fc.ack_request = cb->ackreq;
	302	hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
32bad7e3	303
036562f9	304	if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
f30be4d5 PB	305	return -EINVAL;
f30be4d5 PB	306
32bad7e3	307	if (!saddr) {
036562f9	308	spin_lock_bh(&sdata->mib_lock);
32bad7e3	309
036562f9 AA	310	if (sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) \|\|
	311	sdata->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) \|\|
	312	sdata->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
e6278d92	313	hdr.source.mode = IEEE802154_ADDR_LONG;
036562f9	314	hdr.source.extended_addr = sdata->extended_addr;
32bad7e3	315	} else {
e6278d92	316	hdr.source.mode = IEEE802154_ADDR_SHORT;
036562f9	317	hdr.source.short_addr = sdata->short_addr;
32bad7e3	318	}
32bad7e3	319
036562f9	320	hdr.source.pan_id = sdata->pan_id;
32bad7e3	321
036562f9	322	spin_unlock_bh(&sdata->mib_lock);
e6278d92 PB	323	} else {
e6278d92 PB	324	hdr.source = (const struct ieee802154_addr )saddr;
32bad7e3	325	}
32bad7e3	326
e6278d92	327	hdr.dest = (const struct ieee802154_addr )daddr;
32bad7e3	328
e6278d92 PB	329	hlen = ieee802154_hdr_push(skb, &hdr);
	330	if (hlen < 0)
	331	return -EINVAL;
32bad7e3	332
3e69162e	333	skb_reset_mac_header(skb);
e6278d92	334	skb->mac_len = hlen;
32bad7e3	335
8c84296f	336	if (len > ieee802154_max_payload(&hdr))
d1d7358e PB	337	return -EMSGSIZE;
d1d7358e PB	338
e6278d92	339	return hlen;
32bad7e3	340	}
	341
	342	static int
	343	mac802154_header_parse(const struct sk_buff skb, unsigned char haddr)
	344	{
e6278d92 PB	345	struct ieee802154_hdr hdr;
e6278d92 PB	346	struct ieee802154_addr addr = (struct ieee802154_addr )haddr;
32bad7e3	347
e6278d92 PB	348	if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
	349	pr_debug("malformed packet\n");
	350	return 0;
32bad7e3	351	}
32bad7e3	352
e6278d92 PB	353	*addr = hdr.source;
e6278d92 PB	354	return sizeof(*addr);
32bad7e3	355	}
32bad7e3	356
32bad7e3	357	static struct header_ops mac802154_header_ops = {
	358	.create = mac802154_header_create,
	359	.parse = mac802154_header_parse,
	360	};
	361
	362	static const struct net_device_ops mac802154_wpan_ops = {
e462ded6	363	.ndo_open = mac802154_wpan_open,
32bad7e3	364	.ndo_stop = mac802154_slave_close,
e5e584fc	365	.ndo_start_xmit = ieee802154_subif_start_xmit,
32bad7e3	366	.ndo_do_ioctl = mac802154_wpan_ioctl,
	367	.ndo_set_mac_address = mac802154_wpan_mac_addr,
	368	};
	369
b9ff77e5	370	static const struct net_device_ops mac802154_monitor_ops = {
38130c31	371	.ndo_open = mac802154_wpan_open,
b9ff77e5 AA	372	.ndo_stop = mac802154_slave_close,
	373	.ndo_start_xmit = ieee802154_monitor_start_xmit,
	374	};
	375
f30be4d5 PB	376	static void mac802154_wpan_free(struct net_device *dev)
f30be4d5 PB	377	{
59d19cd7	378	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
f30be4d5	379
036562f9	380	mac802154_llsec_destroy(&sdata->sec);
f30be4d5 PB	381
	382	free_netdev(dev);
	383	}
	384
d5ae67ba	385	static void ieee802154_if_setup(struct net_device *dev)
32bad7e3	386	{
32bad7e3	387	dev->addr_len = IEEE802154_ADDR_LEN;
	388	memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
	389
	390	dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN;
f30be4d5	391	dev->needed_tailroom = 2 + 16; /* FCS + MIC */
32bad7e3	392	dev->mtu = IEEE802154_MTU;
e937f583	393	dev->tx_queue_len = 300;
32bad7e3	394	dev->flags = IFF_NOARP \| IFF_BROADCAST;
d5ae67ba	395	}
32bad7e3	396
d5ae67ba AA	397	static int
	398	ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata, int type)
	399	{
	400	/* set some type-dependent values */
7c118c1a	401	sdata->vif.type = type;
32bad7e3	402
036562f9 AA	403	get_random_bytes(&sdata->bsn, 1);
036562f9 AA	404	get_random_bytes(&sdata->dsn, 1);
32bad7e3	405
e462ded6	406	/* defaults per 802.15.4-2011 */
036562f9 AA	407	sdata->mac_params.min_be = 3;
	408	sdata->mac_params.max_be = 5;
	409	sdata->mac_params.csma_retries = 4;
	410	/* for compatibility, actual default is 3 */
	411	sdata->mac_params.frame_retries = -1;
e462ded6	412
dee56d14	413	ieee802154_be64_to_le64(&sdata->extended_addr, sdata->dev->dev_addr);
036562f9 AA	414	sdata->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
036562f9 AA	415	sdata->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
f30be4d5	416
d5ae67ba AA	417	switch (type) {
	418	case IEEE802154_DEV_WPAN:
	419	sdata->dev->header_ops = &mac802154_header_ops;
	420	sdata->dev->destructor = mac802154_wpan_free;
	421	sdata->dev->netdev_ops = &mac802154_wpan_ops;
	422	sdata->dev->ml_priv = &mac802154_mlme_wpan;
	423	sdata->promisuous_mode = false;
986a8abf	424
d5ae67ba AA	425	spin_lock_init(&sdata->mib_lock);
d5ae67ba AA	426	mutex_init(&sdata->sec_mtx);
986a8abf	427
d5ae67ba AA	428	mac802154_llsec_init(&sdata->sec);
	429	break;
	430	case IEEE802154_DEV_MONITOR:
	431	sdata->dev->destructor = free_netdev;
	432	sdata->dev->netdev_ops = &mac802154_monitor_ops;
d5ae67ba AA	433	sdata->promisuous_mode = true;
	434	break;
	435	default:
	436	BUG();
	437	}
986a8abf AA	438
	439	return 0;
	440	}
	441
	442	struct net_device *
	443	ieee802154_if_add(struct ieee802154_local local, const char name,
	444	struct wpan_dev **new_wpan_dev, int type)
	445	{
d5ae67ba AA	446	struct net_device *ndev = NULL;
	447	struct ieee802154_sub_if_data *sdata = NULL;
	448	int ret = -ENOMEM;
	449
	450	ASSERT_RTNL();
	451
7c118c1a AA	452	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
7c118c1a AA	453	NET_NAME_UNKNOWN, ieee802154_if_setup);
d5ae67ba AA	454	if (!ndev)
	455	return ERR_PTR(-ENOMEM);
	456
	457	ndev->needed_headroom = local->hw.extra_tx_headroom;
	458
	459	ret = dev_alloc_name(ndev, ndev->name);
	460	if (ret < 0)
	461	goto err;
986a8abf AA	462
986a8abf AA	463	switch (type) {
986a8abf	464	case IEEE802154_DEV_WPAN:
d5ae67ba	465	ndev->type = ARPHRD_IEEE802154;
986a8abf	466	break;
d5ae67ba AA	467	case IEEE802154_DEV_MONITOR:
d5ae67ba AA	468	ndev->type = ARPHRD_IEEE802154_MONITOR;
986a8abf	469	break;
d5ae67ba AA	470	default:
	471	ret = -EINVAL;
	472	goto err;
986a8abf	473	}
d5ae67ba	474
dee56d14 AA	475	ieee802154_le64_to_be64(ndev->perm_addr,
	476	&local->hw.phy->perm_extended_addr);
	477	memcpy(ndev->dev_addr, ndev->perm_addr, IEEE802154_EXTENDED_ADDR_LEN);
d5ae67ba AA	478	/* TODO check this */
	479	SET_NETDEV_DEV(ndev, &local->phy->dev);
	480	sdata = netdev_priv(ndev);
	481	ndev->ieee802154_ptr = &sdata->wpan_dev;
	482	memcpy(sdata->name, ndev->name, IFNAMSIZ);
	483	sdata->dev = ndev;
	484	sdata->wpan_dev.wpan_phy = local->hw.phy;
	485	sdata->local = local;
	486
	487	/* setup type-dependent data */
	488	ret = ieee802154_setup_sdata(sdata, type);
	489	if (ret)
986a8abf AA	490	goto err;
986a8abf AA	491
d5ae67ba AA	492	if (ndev) {
	493	ret = register_netdevice(ndev);
	494	if (ret < 0)
	495	goto err;
	496	}
	497
	498	mutex_lock(&local->iflist_mtx);
	499	list_add_tail_rcu(&sdata->list, &local->interfaces);
	500	mutex_unlock(&local->iflist_mtx);
986a8abf	501
d5ae67ba AA	502	if (new_wpan_dev)
	503	*new_wpan_dev = &sdata->wpan_dev;
	504
	505	return ndev;
986a8abf	506
986a8abf	507	err:
d5ae67ba AA	508	free_netdev(ndev);
d5ae67ba AA	509	return ERR_PTR(ret);
986a8abf AA	510	}
986a8abf AA	511
b210b187 AA	512	void ieee802154_if_remove(struct ieee802154_sub_if_data *sdata)
	513	{
	514	ASSERT_RTNL();
	515
	516	mutex_lock(&sdata->local->iflist_mtx);
	517	list_del_rcu(&sdata->list);
	518	mutex_unlock(&sdata->local->iflist_mtx);
	519
	520	synchronize_rcu();
	521	unregister_netdevice(sdata->dev);
	522	}