net/ieee802154/nl-phy.c - kernel/msm-4.9 - Gitiles

 /*
  * Netlink inteface for IEEE 802.15.4 stack
  *
  * 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>
  * Maxim Osipov <maxim.osipov@siemens.com>
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/if_arp.h>
 #include <net/netlink.h>
 #include <net/genetlink.h>
 #include <net/wpan-phy.h>
 #include <net/af_ieee802154.h>
 #include <net/ieee802154_netdev.h>
 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
 #include <linux/nl802154.h>

 #include "ieee802154.h"

 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
 	u32 seq, int flags, struct wpan_phy *phy)
 {
 	void *hdr;
 	int i, pages = 0;
 	uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);

 	pr_debug("%s\n", __func__);

 	if (!buf)
 		return -EMSGSIZE;

 	hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
 		IEEE802154_LIST_PHY);
 	if (!hdr)
 		goto out;

 	mutex_lock(&phy->pib_lock);
 	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 	    nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
 	    nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
 		goto nla_put_failure;
 	for (i = 0; i < 32; i++) {
 		if (phy->channels_supported[i])
 			buf[pages++] = phy->channels_supported[i] | (i << 27);
 	}
 	if (pages &&
 	    nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
 		    pages * sizeof(uint32_t), buf))
 		goto nla_put_failure;
 	mutex_unlock(&phy->pib_lock);
 	kfree(buf);
 	return genlmsg_end(msg, hdr);

 nla_put_failure:
 	mutex_unlock(&phy->pib_lock);
 	genlmsg_cancel(msg, hdr);
 out:
 	kfree(buf);
 	return -EMSGSIZE;
 }

 static int ieee802154_list_phy(struct sk_buff *skb,
 	struct genl_info *info)
 {
 	/* Request for interface name, index, type, IEEE address,
 	   PAN Id, short address */
 	struct sk_buff *msg;
 	struct wpan_phy *phy;
 	const char *name;
 	int rc = -ENOBUFS;

 	pr_debug("%s\n", __func__);

 	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 		return -EINVAL;

 	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 		return -EINVAL; /* phy name should be null-terminated */


 	phy = wpan_phy_find(name);
 	if (!phy)
 		return -ENODEV;

 	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 	if (!msg)
 		goto out_dev;

 	rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
 			0, phy);
 	if (rc < 0)
 		goto out_free;

 	wpan_phy_put(phy);

 	return genlmsg_reply(msg, info);
 out_free:
 	nlmsg_free(msg);
 out_dev:
 	wpan_phy_put(phy);
 	return rc;

 }

 struct dump_phy_data {
 	struct sk_buff *skb;
 	struct netlink_callback *cb;
 	int idx, s_idx;
 };

 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 {
 	int rc;
 	struct dump_phy_data *data = _data;

 	pr_debug("%s\n", __func__);

 	if (data->idx++ < data->s_idx)
 		return 0;

 	rc = ieee802154_nl_fill_phy(data->skb,
 			NETLINK_CB(data->cb->skb).pid,
 			data->cb->nlh->nlmsg_seq,
 			NLM_F_MULTI,
 			phy);

 	if (rc < 0) {
 		data->idx--;
 		return rc;
 	}

 	return 0;
 }

 static int ieee802154_dump_phy(struct sk_buff *skb,
 	struct netlink_callback *cb)
 {
 	struct dump_phy_data data = {
 		.cb = cb,
 		.skb = skb,
 		.s_idx = cb->args[0],
 		.idx = 0,
 	};

 	pr_debug("%s\n", __func__);

 	wpan_phy_for_each(ieee802154_dump_phy_iter, &data);

 	cb->args[0] = data.idx;

 	return skb->len;
 }

 static int ieee802154_add_iface(struct sk_buff *skb,
 		struct genl_info *info)
 {
 	struct sk_buff *msg;
 	struct wpan_phy *phy;
 	const char *name;
 	const char *devname;
 	int rc = -ENOBUFS;
 	struct net_device *dev;

 	pr_debug("%s\n", __func__);

 	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 		return -EINVAL;

 	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 		return -EINVAL; /* phy name should be null-terminated */

 	if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 		devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 		if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 				!= '\0')
 			return -EINVAL; /* phy name should be null-terminated */
 	} else  {
 		devname = "wpan%d";
 	}

 	if (strlen(devname) >= IFNAMSIZ)
 		return -ENAMETOOLONG;

 	phy = wpan_phy_find(name);
 	if (!phy)
 		return -ENODEV;

 	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 	if (!msg)
 		goto out_dev;

 	if (!phy->add_iface) {
 		rc = -EINVAL;
 		goto nla_put_failure;
 	}

 	if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 	    nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 			IEEE802154_ADDR_LEN) {
 		rc = -EINVAL;
 		goto nla_put_failure;
 	}

 	dev = phy->add_iface(phy, devname);
 	if (IS_ERR(dev)) {
 		rc = PTR_ERR(dev);
 		goto nla_put_failure;
 	}

 	if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 		struct sockaddr addr;

 		addr.sa_family = ARPHRD_IEEE802154;
 		nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 				IEEE802154_ADDR_LEN);

 		/*
 		 * strangely enough, some callbacks (inetdev_event) from
 		 * dev_set_mac_address require RTNL_LOCK
 		 */
 		rtnl_lock();
 		rc = dev_set_mac_address(dev, &addr);
 		rtnl_unlock();
 		if (rc)
 			goto dev_unregister;
 	}

 	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 	    nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 		goto nla_put_failure;
 	dev_put(dev);

 	wpan_phy_put(phy);

 	return ieee802154_nl_reply(msg, info);

 dev_unregister:
 	rtnl_lock(); /* del_iface must be called with RTNL lock */
 	phy->del_iface(phy, dev);
 	dev_put(dev);
 	rtnl_unlock();
 nla_put_failure:
 	nlmsg_free(msg);
 out_dev:
 	wpan_phy_put(phy);
 	return rc;
 }

 static int ieee802154_del_iface(struct sk_buff *skb,
 		struct genl_info *info)
 {
 	struct sk_buff *msg;
 	struct wpan_phy *phy;
 	const char *name;
 	int rc;
 	struct net_device *dev;

 	pr_debug("%s\n", __func__);

 	if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 		return -EINVAL;

 	name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 	if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 		return -EINVAL; /* name should be null-terminated */

 	dev = dev_get_by_name(genl_info_net(info), name);
 	if (!dev)
 		return -ENODEV;

 	phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 	BUG_ON(!phy);

 	rc = -EINVAL;
 	/* phy name is optional, but should be checked if it's given */
 	if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 		struct wpan_phy *phy2;

 		const char *pname =
 			nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 		if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 				!= '\0')
 			/* name should be null-terminated */
 			goto out_dev;

 		phy2 = wpan_phy_find(pname);
 		if (!phy2)
 			goto out_dev;

 		if (phy != phy2) {
 			wpan_phy_put(phy2);
 			goto out_dev;
 		}
 	}

 	rc = -ENOBUFS;

 	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 	if (!msg)
 		goto out_dev;

 	if (!phy->del_iface) {
 		rc = -EINVAL;
 		goto nla_put_failure;
 	}

 	rtnl_lock();
 	phy->del_iface(phy, dev);

 	/* We don't have device anymore */
 	dev_put(dev);
 	dev = NULL;

 	rtnl_unlock();

 	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 	    nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 		goto nla_put_failure;
 	wpan_phy_put(phy);

 	return ieee802154_nl_reply(msg, info);

 nla_put_failure:
 	nlmsg_free(msg);
 out_dev:
 	wpan_phy_put(phy);
 	if (dev)
 		dev_put(dev);

 	return rc;
 }

 static struct genl_ops ieee802154_phy_ops[] = {
 	IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
 							ieee802154_dump_phy),
 	IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
 	IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
 };

 /*
  * No need to unregister as family unregistration will do it.
  */
 int nl802154_phy_register(void)
 {
 	int i;
 	int rc;

 	for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
 		rc = genl_register_ops(&nl802154_family,
 				&ieee802154_phy_ops[i]);
 		if (rc)
 			return rc;
 	}

 	return 0;
 }
	/*
	* Netlink inteface for IEEE 802.15.4 stack
	*
	* 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>
	* Maxim Osipov <maxim.osipov@siemens.com>
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/if_arp.h>
	#include <net/netlink.h>
	#include <net/genetlink.h>
	#include <net/wpan-phy.h>
	#include <net/af_ieee802154.h>
	#include <net/ieee802154_netdev.h>
	#include <net/rtnetlink.h> /* for rtnl_{un,}lock */
	#include <linux/nl802154.h>

	#include "ieee802154.h"

	static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
	u32 seq, int flags, struct wpan_phy *phy)
	{
	void *hdr;
	int i, pages = 0;
	uint32_t buf = kzalloc(32 sizeof(uint32_t), GFP_KERNEL);

	pr_debug("%s\n", __func__);

	if (!buf)
	return -EMSGSIZE;

	hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
	IEEE802154_LIST_PHY);
	if (!hdr)
	goto out;

	mutex_lock(&phy->pib_lock);
	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) \|\|
	nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) \|\|
	nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
	goto nla_put_failure;
	for (i = 0; i < 32; i++) {
	if (phy->channels_supported[i])
	buf[pages++] = phy->channels_supported[i] \| (i << 27);
	}
	if (pages &&
	nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
	pages * sizeof(uint32_t), buf))
	goto nla_put_failure;
	mutex_unlock(&phy->pib_lock);
	kfree(buf);
	return genlmsg_end(msg, hdr);

	nla_put_failure:
	mutex_unlock(&phy->pib_lock);
	genlmsg_cancel(msg, hdr);
	out:
	kfree(buf);
	return -EMSGSIZE;
	}

	static int ieee802154_list_phy(struct sk_buff *skb,
	struct genl_info *info)
	{
	/* Request for interface name, index, type, IEEE address,
	PAN Id, short address */
	struct sk_buff *msg;
	struct wpan_phy *phy;
	const char *name;
	int rc = -ENOBUFS;

	pr_debug("%s\n", __func__);

	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
	return -EINVAL;

	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
	return -EINVAL; /* phy name should be null-terminated */


	phy = wpan_phy_find(name);
	if (!phy)
	return -ENODEV;

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!msg)
	goto out_dev;

	rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
	0, phy);
	if (rc < 0)
	goto out_free;

	wpan_phy_put(phy);

	return genlmsg_reply(msg, info);
	out_free:
	nlmsg_free(msg);
	out_dev:
	wpan_phy_put(phy);
	return rc;

	}

	struct dump_phy_data {
	struct sk_buff *skb;
	struct netlink_callback *cb;
	int idx, s_idx;
	};

	static int ieee802154_dump_phy_iter(struct wpan_phy phy, void _data)
	{
	int rc;
	struct dump_phy_data *data = _data;

	pr_debug("%s\n", __func__);

	if (data->idx++ < data->s_idx)
	return 0;

	rc = ieee802154_nl_fill_phy(data->skb,
	NETLINK_CB(data->cb->skb).pid,
	data->cb->nlh->nlmsg_seq,
	NLM_F_MULTI,
	phy);

	if (rc < 0) {
	data->idx--;
	return rc;
	}

	return 0;
	}

	static int ieee802154_dump_phy(struct sk_buff *skb,
	struct netlink_callback *cb)
	{
	struct dump_phy_data data = {
	.cb = cb,
	.skb = skb,
	.s_idx = cb->args[0],
	.idx = 0,
	};

	pr_debug("%s\n", __func__);

	wpan_phy_for_each(ieee802154_dump_phy_iter, &data);

	cb->args[0] = data.idx;

	return skb->len;
	}

	static int ieee802154_add_iface(struct sk_buff *skb,
	struct genl_info *info)
	{
	struct sk_buff *msg;
	struct wpan_phy *phy;
	const char *name;
	const char *devname;
	int rc = -ENOBUFS;
	struct net_device *dev;

	pr_debug("%s\n", __func__);

	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
	return -EINVAL;

	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
	return -EINVAL; /* phy name should be null-terminated */

	if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
	devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
	if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
	!= '\0')
	return -EINVAL; /* phy name should be null-terminated */
	} else {
	devname = "wpan%d";
	}

	if (strlen(devname) >= IFNAMSIZ)
	return -ENAMETOOLONG;

	phy = wpan_phy_find(name);
	if (!phy)
	return -ENODEV;

	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
	if (!msg)
	goto out_dev;

	if (!phy->add_iface) {
	rc = -EINVAL;
	goto nla_put_failure;
	}

	if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
	nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
	IEEE802154_ADDR_LEN) {
	rc = -EINVAL;
	goto nla_put_failure;
	}

	dev = phy->add_iface(phy, devname);
	if (IS_ERR(dev)) {
	rc = PTR_ERR(dev);
	goto nla_put_failure;
	}

	if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
	struct sockaddr addr;

	addr.sa_family = ARPHRD_IEEE802154;
	nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
	IEEE802154_ADDR_LEN);

	/*
	* strangely enough, some callbacks (inetdev_event) from
	* dev_set_mac_address require RTNL_LOCK
	*/
	rtnl_lock();
	rc = dev_set_mac_address(dev, &addr);
	rtnl_unlock();
	if (rc)
	goto dev_unregister;
	}

	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) \|\|
	nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
	goto nla_put_failure;
	dev_put(dev);

	wpan_phy_put(phy);

	return ieee802154_nl_reply(msg, info);

	dev_unregister:
	rtnl_lock(); /* del_iface must be called with RTNL lock */
	phy->del_iface(phy, dev);
	dev_put(dev);
	rtnl_unlock();
	nla_put_failure:
	nlmsg_free(msg);
	out_dev:
	wpan_phy_put(phy);
	return rc;
	}

	static int ieee802154_del_iface(struct sk_buff *skb,
	struct genl_info *info)
	{
	struct sk_buff *msg;
	struct wpan_phy *phy;
	const char *name;
	int rc;
	struct net_device *dev;

	pr_debug("%s\n", __func__);

	if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
	return -EINVAL;

	name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
	if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
	return -EINVAL; /* name should be null-terminated */

	dev = dev_get_by_name(genl_info_net(info), name);
	if (!dev)
	return -ENODEV;

	phy = ieee802154_mlme_ops(dev)->get_phy(dev);
	BUG_ON(!phy);

	rc = -EINVAL;
	/* phy name is optional, but should be checked if it's given */
	if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
	struct wpan_phy *phy2;

	const char *pname =
	nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
	!= '\0')
	/* name should be null-terminated */
	goto out_dev;

	phy2 = wpan_phy_find(pname);
	if (!phy2)
	goto out_dev;

	if (phy != phy2) {
	wpan_phy_put(phy2);
	goto out_dev;
	}
	}

	rc = -ENOBUFS;

	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
	if (!msg)
	goto out_dev;

	if (!phy->del_iface) {
	rc = -EINVAL;
	goto nla_put_failure;
	}

	rtnl_lock();
	phy->del_iface(phy, dev);

	/* We don't have device anymore */
	dev_put(dev);
	dev = NULL;

	rtnl_unlock();

	if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) \|\|
	nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
	goto nla_put_failure;
	wpan_phy_put(phy);

	return ieee802154_nl_reply(msg, info);

	nla_put_failure:
	nlmsg_free(msg);
	out_dev:
	wpan_phy_put(phy);
	if (dev)
	dev_put(dev);

	return rc;
	}

	static struct genl_ops ieee802154_phy_ops[] = {
	IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
	ieee802154_dump_phy),
	IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
	IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
	};

	/*
	* No need to unregister as family unregistration will do it.
	*/
	int nl802154_phy_register(void)
	{
	int i;
	int rc;

	for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
	rc = genl_register_ops(&nl802154_family,
	&ieee802154_phy_ops[i]);
	if (rc)
	return rc;
	}

	return 0;
	}