[net-next-2.6.git] / net / ieee802154 / nl-phy.c

/*
 * 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 <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)
		goto out;

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

	mutex_lock(&phy->pib_lock);
	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);
	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);

	mutex_unlock(&phy->pib_lock);
	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;
	}

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

	NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
	NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);

	dev_put(dev);

	wpan_phy_put(phy);

	return ieee802154_nl_reply(msg, info);

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();


	NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
	NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);

	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;
}
Commit	Line	Data
1eaa9d03 DES	1	/*
	2	* Netlink inteface for IEEE 802.15.4 stack
	3	*
	4	* Copyright 2007, 2008 Siemens AG
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; if not, write to the Free Software Foundation, Inc.,
	17	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	18	*
	19	* Written by:
	20	* Sergey Lapin <slapin@ossfans.org>
	21	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	22	* Maxim Osipov <maxim.osipov@siemens.com>
	23	*/
	24
	25	#include <linux/kernel.h>
5a0e3ad6	26	#include <linux/slab.h>
1eaa9d03 DES	27	#include <net/netlink.h>
	28	#include <net/genetlink.h>
	29	#include <net/wpan-phy.h>
bb1cafb8 DES	30	#include <net/af_ieee802154.h>
	31	#include <net/ieee802154_netdev.h>
	32	#include <net/rtnetlink.h> /* for rtnl_{un,}lock */
1eaa9d03 DES	33	#include <linux/nl802154.h>
	34
	35	#include "ieee802154.h"
	36
	37	static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
	38	u32 seq, int flags, struct wpan_phy *phy)
	39	{
	40	void *hdr;
	41	int i, pages = 0;
	42	uint32_t buf = kzalloc(32 sizeof(uint32_t), GFP_KERNEL);
	43
	44	pr_debug("%s\n", __func__);
	45
	46	if (!buf)
	47	goto out;
	48
	49	hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
	50	IEEE802154_LIST_PHY);
	51	if (!hdr)
	52	goto out;
	53
	54	mutex_lock(&phy->pib_lock);
	55	NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
	56
	57	NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page);
	58	NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel);
	59	for (i = 0; i < 32; i++) {
	60	if (phy->channels_supported[i])
	61	buf[pages++] = phy->channels_supported[i] \| (i << 27);
	62	}
	63	if (pages)
	64	NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
	65	pages * sizeof(uint32_t), buf);
	66
	67	mutex_unlock(&phy->pib_lock);
	68	return genlmsg_end(msg, hdr);
	69
	70	nla_put_failure:
	71	mutex_unlock(&phy->pib_lock);
	72	genlmsg_cancel(msg, hdr);
	73	out:
	74	kfree(buf);
	75	return -EMSGSIZE;
	76	}
	77
	78	static int ieee802154_list_phy(struct sk_buff *skb,
	79	struct genl_info *info)
	80	{
	81	/* Request for interface name, index, type, IEEE address,
	82	PAN Id, short address */
	83	struct sk_buff *msg;
	84	struct wpan_phy *phy;
	85	const char *name;
	86	int rc = -ENOBUFS;
	87
	88	pr_debug("%s\n", __func__);
	89
	90	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
	91	return -EINVAL;
	92
	93	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	94	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
	95	return -EINVAL; /* phy name should be null-terminated */
	96
97
98	phy = wpan_phy_find(name);
99	if (!phy)
100	return -ENODEV;
101
102	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
103	if (!msg)
104	goto out_dev;
105
106	rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
107	0, phy);
108	if (rc < 0)
109	goto out_free;
110
111	wpan_phy_put(phy);
112
113	return genlmsg_reply(msg, info);
114	out_free:
115	nlmsg_free(msg);
116	out_dev:
117	wpan_phy_put(phy);
118	return rc;
119
120	}
121
122	struct dump_phy_data {
123	struct sk_buff *skb;
124	struct netlink_callback *cb;
125	int idx, s_idx;
126	};
127
128	static int ieee802154_dump_phy_iter(struct wpan_phy phy, void _data)
129	{
130	int rc;
131	struct dump_phy_data *data = _data;
132
133	pr_debug("%s\n", __func__);
134
135	if (data->idx++ < data->s_idx)
136	return 0;
137
138	rc = ieee802154_nl_fill_phy(data->skb,
139	NETLINK_CB(data->cb->skb).pid,
140	data->cb->nlh->nlmsg_seq,
141	NLM_F_MULTI,
142	phy);
143
144	if (rc < 0) {
145	data->idx--;
146	return rc;
147	}
148
149	return 0;
150	}
151
152	static int ieee802154_dump_phy(struct sk_buff *skb,
153	struct netlink_callback *cb)
154	{
155	struct dump_phy_data data = {
156	.cb = cb,
157	.skb = skb,
158	.s_idx = cb->args[0],
159	.idx = 0,
160	};
161
162	pr_debug("%s\n", __func__);
163
164	wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
165
166	cb->args[0] = data.idx;
167
168	return skb->len;
169	}
170
bb1cafb8 DES	171	static int ieee802154_add_iface(struct sk_buff *skb,
	172	struct genl_info *info)
	173	{
	174	struct sk_buff *msg;
	175	struct wpan_phy *phy;
	176	const char *name;
	177	const char *devname;
	178	int rc = -ENOBUFS;
	179	struct net_device *dev;
	180
	181	pr_debug("%s\n", __func__);
	182
	183	if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
	184	return -EINVAL;
	185
	186	name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
	187	if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
	188	return -EINVAL; /* phy name should be null-terminated */
	189
	190	if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
	191	devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
	192	if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
	193	!= '\0')
	194	return -EINVAL; /* phy name should be null-terminated */
	195	} else {
	196	devname = "wpan%d";
	197	}
	198
	199	if (strlen(devname) >= IFNAMSIZ)
	200	return -ENAMETOOLONG;
	201
	202	phy = wpan_phy_find(name);
	203	if (!phy)
	204	return -ENODEV;
	205
	206	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
	207	if (!msg)
	208	goto out_dev;
	209
	210	if (!phy->add_iface) {
	211	rc = -EINVAL;
	212	goto nla_put_failure;
	213	}
	214
	215	dev = phy->add_iface(phy, devname);
	216	if (IS_ERR(dev)) {
	217	rc = PTR_ERR(dev);
	218	goto nla_put_failure;
	219	}
	220
	221	NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
	222	NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
	223
	224	dev_put(dev);
	225
	226	wpan_phy_put(phy);
	227
	228	return ieee802154_nl_reply(msg, info);
	229
	230	nla_put_failure:
	231	nlmsg_free(msg);
	232	out_dev:
	233	wpan_phy_put(phy);
	234	return rc;
235	}
236
237	static int ieee802154_del_iface(struct sk_buff *skb,
238	struct genl_info *info)
239	{
240	struct sk_buff *msg;
241	struct wpan_phy *phy;
242	const char *name;
243	int rc;
244	struct net_device *dev;
245
246	pr_debug("%s\n", __func__);
247
248	if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
249	return -EINVAL;
250
251	name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
252	if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
253	return -EINVAL; /* name should be null-terminated */
254
255	dev = dev_get_by_name(genl_info_net(info), name);
256	if (!dev)
257	return -ENODEV;
258
259	phy = ieee802154_mlme_ops(dev)->get_phy(dev);
260	BUG_ON(!phy);
261
262	rc = -EINVAL;
263	/* phy name is optional, but should be checked if it's given */
264	if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
265	struct wpan_phy *phy2;
266
267	const char *pname =
268	nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
269	if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
270	!= '\0')
271	/* name should be null-terminated */
272	goto out_dev;
273
274	phy2 = wpan_phy_find(pname);
275	if (!phy2)
276	goto out_dev;
277
278	if (phy != phy2) {
279	wpan_phy_put(phy2);
280	goto out_dev;
281	}
282	}
283
284	rc = -ENOBUFS;
285
286	msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
287	if (!msg)
288	goto out_dev;
289
290	if (!phy->del_iface) {
291	rc = -EINVAL;
292	goto nla_put_failure;
293	}
294
295	rtnl_lock();
296	phy->del_iface(phy, dev);
297
298	/* We don't have device anymore */
299	dev_put(dev);
300	dev = NULL;
301
302	rtnl_unlock();
303
304
305	NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
306	NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);
307
308	wpan_phy_put(phy);
309
310	return ieee802154_nl_reply(msg, info);
311
312	nla_put_failure:
313	nlmsg_free(msg);
314	out_dev:
315	wpan_phy_put(phy);
316	if (dev)
317	dev_put(dev);
318
319	return rc;
320	}
321
1eaa9d03 DES	322	static struct genl_ops ieee802154_phy_ops[] = {
	323	IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
	324	ieee802154_dump_phy),
bb1cafb8 DES	325	IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
bb1cafb8 DES	326	IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
1eaa9d03 DES	327	};
	328
	329	/*
	330	* No need to unregister as family unregistration will do it.
	331	*/
	332	int nl802154_phy_register(void)
	333	{
	334	int i;
	335	int rc;
	336
	337	for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
	338	rc = genl_register_ops(&nl802154_family,
	339	&ieee802154_phy_ops[i]);
	340	if (rc)
	341	return rc;
	342	}
	343
	344	return 0;
	345	}