[mirror_ubuntu-bionic-kernel.git] / drivers / w1 / w1_netlink.c

/*
 * w1_netlink.c
 *
 * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/connector.h>

#include "w1.h"
#include "w1_log.h"
#include "w1_netlink.h"

#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
{
	char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
	struct cn_msg *m = (struct cn_msg *)buf;
	struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);

	memset(buf, 0, sizeof(buf));

	m->id.idx = CN_W1_IDX;
	m->id.val = CN_W1_VAL;

	m->seq = dev->seq++;
	m->len = sizeof(struct w1_netlink_msg);

	memcpy(w, msg, sizeof(struct w1_netlink_msg));

	cn_netlink_send(m, 0, GFP_KERNEL);
}

static void w1_send_slave(struct w1_master *dev, u64 rn)
{
	struct cn_msg *msg = dev->priv;
	struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
	struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
	int avail;

	avail = dev->priv_size - cmd->len;

	if (avail > 8) {
		u64 *data = (void *)(cmd + 1) + cmd->len;

		*data = rn;
		cmd->len += 8;
		hdr->len += 8;
		msg->len += 8;
		return;
	}

	msg->ack++;
	cn_netlink_send(msg, 0, GFP_KERNEL);

	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
	hdr->len = sizeof(struct w1_netlink_cmd);
	cmd->len = 0;
}

static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg,
		unsigned int avail)
{
	struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1);
	struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1);
	int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;

	dev->priv = msg;
	dev->priv_size = avail;

	w1_search_devices(dev, search_type, w1_send_slave);

	msg->ack = 0;
	cn_netlink_send(msg, 0, GFP_KERNEL);

	dev->priv = NULL;
	dev->priv_size = 0;

	return 0;
}

static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
		struct w1_netlink_cmd *cmd)
{
	void *data;
	struct w1_netlink_msg *h;
	struct w1_netlink_cmd *c;
	struct cn_msg *cm;
	int err;

	data = kzalloc(sizeof(struct cn_msg) +
			sizeof(struct w1_netlink_msg) +
			sizeof(struct w1_netlink_cmd) +
			cmd->len, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	cm = (struct cn_msg *)(data);
	h = (struct w1_netlink_msg *)(cm + 1);
	c = (struct w1_netlink_cmd *)(h + 1);

	memcpy(cm, msg, sizeof(struct cn_msg));
	memcpy(h, hdr, sizeof(struct w1_netlink_msg));
	memcpy(c, cmd, sizeof(struct w1_netlink_cmd));

	cm->ack = msg->seq+1;
	cm->len = sizeof(struct w1_netlink_msg) +
		sizeof(struct w1_netlink_cmd) + cmd->len;

	h->len = sizeof(struct w1_netlink_cmd) + cmd->len;

	memcpy(c->data, cmd->data, c->len);

	err = cn_netlink_send(cm, 0, GFP_KERNEL);

	kfree(data);

	return err;
}

static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
		struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
{
	int err = 0;

	switch (cmd->cmd) {
	case W1_CMD_TOUCH:
		w1_touch_block(dev, cmd->data, cmd->len);
		w1_send_read_reply(msg, hdr, cmd);
		break;
	case W1_CMD_READ:
		w1_read_block(dev, cmd->data, cmd->len);
		w1_send_read_reply(msg, hdr, cmd);
		break;
	case W1_CMD_WRITE:
		w1_write_block(dev, cmd->data, cmd->len);
		break;
	default:
		err = -EINVAL;
		break;
	}

	return err;
}

static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg,
		struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd)
{
	int err = -EINVAL;
	struct cn_msg *msg;
	struct w1_netlink_msg *hdr;
	struct w1_netlink_cmd *cmd;

	msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	msg->id = req_msg->id;
	msg->seq = req_msg->seq;
	msg->ack = 0;
	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);

	hdr = (struct w1_netlink_msg *)(msg + 1);
	cmd = (struct w1_netlink_cmd *)(hdr + 1);

	hdr->type = W1_MASTER_CMD;
	hdr->id = req_hdr->id;
	hdr->len = sizeof(struct w1_netlink_cmd);

	cmd->cmd = req_cmd->cmd;
	cmd->len = 0;

	switch (cmd->cmd) {
	case W1_CMD_SEARCH:
	case W1_CMD_ALARM_SEARCH:
		err = w1_process_search_command(dev, msg,
				PAGE_SIZE - msg->len - sizeof(struct cn_msg));
		break;
	case W1_CMD_READ:
	case W1_CMD_WRITE:
	case W1_CMD_TOUCH:
		err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
		break;
	case W1_CMD_RESET:
		err = w1_reset_bus(dev);
		break;
	default:
		err = -EINVAL;
		break;
	}

	kfree(msg);
	return err;
}

static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
		struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)
{
	dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
		__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
		sl->reg_num.crc, cmd->cmd, cmd->len);

	return w1_process_command_io(sl->master, msg, hdr, cmd);
}

static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
{
	struct w1_master *m;
	struct cn_msg *cn;
	struct w1_netlink_msg *w;
	u32 *id;

	if (mcmd->type != W1_LIST_MASTERS) {
		printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
			__func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
		return -EPROTO;
	}

	cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!cn)
		return -ENOMEM;

	cn->id.idx = CN_W1_IDX;
	cn->id.val = CN_W1_VAL;

	cn->seq = msg->seq;
	cn->ack = 1;
	cn->len = sizeof(struct w1_netlink_msg);
	w = (struct w1_netlink_msg *)(cn + 1);

	w->type = W1_LIST_MASTERS;
	w->status = 0;
	w->len = 0;
	id = (u32 *)(w + 1);

	mutex_lock(&w1_mlock);
	list_for_each_entry(m, &w1_masters, w1_master_entry) {
		if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
			cn_netlink_send(cn, 0, GFP_KERNEL);
			cn->ack++;
			cn->len = sizeof(struct w1_netlink_msg);
			w->len = 0;
			id = (u32 *)(w + 1);
		}

		*id = m->id;
		w->len += sizeof(*id);
		cn->len += sizeof(*id);
		id++;
	}
	cn->ack = 0;
	cn_netlink_send(cn, 0, GFP_KERNEL);
	mutex_unlock(&w1_mlock);

	kfree(cn);
	return 0;
}

static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
		struct w1_netlink_cmd *rcmd, int error)
{
	struct cn_msg *cmsg;
	struct w1_netlink_msg *msg;
	struct w1_netlink_cmd *cmd;

	cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL);
	if (!cmsg)
		return -ENOMEM;

	msg = (struct w1_netlink_msg *)(cmsg + 1);
	cmd = (struct w1_netlink_cmd *)(msg + 1);

	memcpy(cmsg, rcmsg, sizeof(*cmsg));
	cmsg->len = sizeof(*msg);

	memcpy(msg, rmsg, sizeof(*msg));
	msg->len = 0;
	msg->status = (short)-error;

	if (rcmd) {
		memcpy(cmd, rcmd, sizeof(*cmd));
		cmd->len = 0;
		msg->len += sizeof(*cmd);
		cmsg->len += sizeof(*cmd);
	}

	error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
	kfree(cmsg);

	return error;
}

static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
	struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
	struct w1_netlink_cmd *cmd;
	struct w1_slave *sl;
	struct w1_master *dev;
	int err = 0;

	while (msg->len && !err) {
		struct w1_reg_num id;
		u16 mlen = m->len;
		u8 *cmd_data = m->data;

		dev = NULL;
		sl = NULL;
		cmd = NULL;

		memcpy(&id, m->id.id, sizeof(id));
#if 0
		printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
				__func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
#endif
		if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
			err = -E2BIG;
			break;
		}

		if (m->type == W1_MASTER_CMD) {
			dev = w1_search_master_id(m->id.mst.id);
		} else if (m->type == W1_SLAVE_CMD) {
			sl = w1_search_slave(&id);
			if (sl)
				dev = sl->master;
		} else {
			err = w1_process_command_root(msg, m);
			goto out_cont;
		}

		if (!dev) {
			err = -ENODEV;
			goto out_cont;
		}

		err = 0;
		if (!mlen)
			goto out_cont;

		mutex_lock(&dev->mutex);

		if (sl && w1_reset_select_slave(sl)) {
			err = -ENODEV;
			goto out_up;
		}

		while (mlen) {
			cmd = (struct w1_netlink_cmd *)cmd_data;

			if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
				err = -E2BIG;
				break;
			}

			if (sl)
				err = w1_process_command_slave(sl, msg, m, cmd);
			else
				err = w1_process_command_master(dev, msg, m, cmd);

			w1_netlink_send_error(msg, m, cmd, err);
			err = 0;

			cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
			mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
		}
out_up:
		atomic_dec(&dev->refcnt);
		if (sl)
			atomic_dec(&sl->refcnt);
		mutex_unlock(&dev->mutex);
out_cont:
		if (!cmd || err)
			w1_netlink_send_error(msg, m, cmd, err);
		msg->len -= sizeof(struct w1_netlink_msg) + m->len;
		m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);

		/*
		 * Let's allow requests for nonexisting devices.
		 */
		if (err == -ENODEV)
			err = 0;
	}
}

int w1_init_netlink(void)
{
	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};

	return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
}

void w1_fini_netlink(void)
{
	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};

	cn_del_callback(&w1_id);
}
#else
void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
{
}

int w1_init_netlink(void)
{
	return 0;
}

void w1_fini_netlink(void)
{
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* w1_netlink.c
	3	*
	4	* Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/skbuff.h>
	23	#include <linux/netlink.h>
12003375	24	#include <linux/connector.h>
1da177e4 LT	25
	26	#include "w1.h"
	27	#include "w1_log.h"
	28	#include "w1_netlink.h"
	29
46e07f6e	30	#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) \|\| (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
1da177e4 LT	31	void w1_netlink_send(struct w1_master dev, struct w1_netlink_msg msg)
1da177e4 LT	32	{
12003375 EP	33	char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
	34	struct cn_msg m = (struct cn_msg )buf;
	35	struct w1_netlink_msg w = (struct w1_netlink_msg )(m+1);
1da177e4	36
12003375	37	memset(buf, 0, sizeof(buf));
1da177e4	38
12003375 EP	39	m->id.idx = CN_W1_IDX;
12003375 EP	40	m->id.val = CN_W1_VAL;
1da177e4	41
12003375 EP	42	m->seq = dev->seq++;
12003375 EP	43	m->len = sizeof(struct w1_netlink_msg);
1da177e4	44
12003375	45	memcpy(w, msg, sizeof(struct w1_netlink_msg));
1da177e4	46
12003375 EP	47	cn_netlink_send(m, 0, GFP_KERNEL);
12003375 EP	48	}
1da177e4	49
3b838407 EP	50	static void w1_send_slave(struct w1_master *dev, u64 rn)
	51	{
	52	struct cn_msg *msg = dev->priv;
	53	struct w1_netlink_msg hdr = (struct w1_netlink_msg )(msg + 1);
	54	struct w1_netlink_cmd cmd = (struct w1_netlink_cmd )(hdr + 1);
	55	int avail;
	56
	57	avail = dev->priv_size - cmd->len;
	58
	59	if (avail > 8) {
	60	u64 data = (void )(cmd + 1) + cmd->len;
	61
	62	*data = rn;
	63	cmd->len += 8;
	64	hdr->len += 8;
	65	msg->len += 8;
	66	return;
	67	}
	68
	69	msg->ack++;
	70	cn_netlink_send(msg, 0, GFP_KERNEL);
	71
	72	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
	73	hdr->len = sizeof(struct w1_netlink_cmd);
	74	cmd->len = 0;
	75	}
	76
	77	static int w1_process_search_command(struct w1_master dev, struct cn_msg msg,
	78	unsigned int avail)
12003375	79	{
3b838407 EP	80	struct w1_netlink_msg hdr = (struct w1_netlink_msg )(msg + 1);
	81	struct w1_netlink_cmd cmd = (struct w1_netlink_cmd )(hdr + 1);
	82	int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
1da177e4	83
3b838407 EP	84	dev->priv = msg;
	85	dev->priv_size = avail;
	86
	87	w1_search_devices(dev, search_type, w1_send_slave);
	88
	89	msg->ack = 0;
	90	cn_netlink_send(msg, 0, GFP_KERNEL);
	91
	92	dev->priv = NULL;
	93	dev->priv_size = 0;
1da177e4	94
12003375	95	return 0;
1da177e4	96	}
2d833179	97
c7e26631 EP	98	static int w1_send_read_reply(struct cn_msg msg, struct w1_netlink_msg hdr,
c7e26631 EP	99	struct w1_netlink_cmd *cmd)
2d833179	100	{
12003375 EP	101	void *data;
	102	struct w1_netlink_msg *h;
	103	struct w1_netlink_cmd *c;
	104	struct cn_msg *cm;
	105	int err;
	106
	107	data = kzalloc(sizeof(struct cn_msg) +
	108	sizeof(struct w1_netlink_msg) +
	109	sizeof(struct w1_netlink_cmd) +
	110	cmd->len, GFP_KERNEL);
	111	if (!data)
	112	return -ENOMEM;
	113
	114	cm = (struct cn_msg *)(data);
	115	h = (struct w1_netlink_msg *)(cm + 1);
	116	c = (struct w1_netlink_cmd *)(h + 1);
	117
	118	memcpy(cm, msg, sizeof(struct cn_msg));
	119	memcpy(h, hdr, sizeof(struct w1_netlink_msg));
	120	memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
	121
	122	cm->ack = msg->seq+1;
c7e26631 EP	123	cm->len = sizeof(struct w1_netlink_msg) +
c7e26631 EP	124	sizeof(struct w1_netlink_cmd) + cmd->len;
12003375 EP	125
	126	h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
	127
	128	memcpy(c->data, cmd->data, c->len);
	129
	130	err = cn_netlink_send(cm, 0, GFP_KERNEL);
	131
	132	kfree(data);
	133
	134	return err;
	135	}
	136
c7e26631	137	static int w1_process_command_io(struct w1_master dev, struct cn_msg msg,
12003375 EP	138	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	139	{
	140	int err = 0;
	141
c7e26631 EP	142	switch (cmd->cmd) {
	143	case W1_CMD_TOUCH:
	144	w1_touch_block(dev, cmd->data, cmd->len);
	145	w1_send_read_reply(msg, hdr, cmd);
	146	break;
	147	case W1_CMD_READ:
	148	w1_read_block(dev, cmd->data, cmd->len);
	149	w1_send_read_reply(msg, hdr, cmd);
	150	break;
	151	case W1_CMD_WRITE:
	152	w1_write_block(dev, cmd->data, cmd->len);
	153	break;
	154	default:
4037014e	155	err = -EINVAL;
c7e26631 EP	156	break;
	157	}
	158
	159	return err;
	160	}
	161
	162	static int w1_process_command_master(struct w1_master dev, struct cn_msg req_msg,
	163	struct w1_netlink_msg req_hdr, struct w1_netlink_cmd req_cmd)
	164	{
	165	int err = -EINVAL;
	166	struct cn_msg *msg;
	167	struct w1_netlink_msg *hdr;
	168	struct w1_netlink_cmd *cmd;
	169
	170	msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
	171	if (!msg)
	172	return -ENOMEM;
	173
	174	msg->id = req_msg->id;
	175	msg->seq = req_msg->seq;
	176	msg->ack = 0;
	177	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
	178
	179	hdr = (struct w1_netlink_msg *)(msg + 1);
	180	cmd = (struct w1_netlink_cmd *)(hdr + 1);
	181
	182	hdr->type = W1_MASTER_CMD;
	183	hdr->id = req_hdr->id;
	184	hdr->len = sizeof(struct w1_netlink_cmd);
	185
	186	cmd->cmd = req_cmd->cmd;
	187	cmd->len = 0;
12003375 EP	188
12003375 EP	189	switch (cmd->cmd) {
c7e26631 EP	190	case W1_CMD_SEARCH:
	191	case W1_CMD_ALARM_SEARCH:
	192	err = w1_process_search_command(dev, msg,
	193	PAGE_SIZE - msg->len - sizeof(struct cn_msg));
	194	break;
	195	case W1_CMD_READ:
	196	case W1_CMD_WRITE:
	197	case W1_CMD_TOUCH:
4037014e	198	err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
c7e26631	199	break;
f89735c4 EP	200	case W1_CMD_RESET:
	201	err = w1_reset_bus(dev);
	202	break;
c7e26631	203	default:
4037014e	204	err = -EINVAL;
c7e26631	205	break;
2d833179 EP	206	}
2d833179 EP	207
c7e26631	208	kfree(msg);
12003375 EP	209	return err;
	210	}
	211
c7e26631 EP	212	static int w1_process_command_slave(struct w1_slave sl, struct cn_msg msg,
	213	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	214	{
	215	dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
	216	__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
	217	sl->reg_num.crc, cmd->cmd, cmd->len);
	218
	219	return w1_process_command_io(sl->master, msg, hdr, cmd);
	220	}
	221
610705e7 EP	222	static int w1_process_command_root(struct cn_msg msg, struct w1_netlink_msg mcmd)
	223	{
	224	struct w1_master *m;
	225	struct cn_msg *cn;
	226	struct w1_netlink_msg *w;
	227	u32 *id;
	228
	229	if (mcmd->type != W1_LIST_MASTERS) {
	230	printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
c7e26631	231	__func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
610705e7 EP	232	return -EPROTO;
	233	}
	234
	235	cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
	236	if (!cn)
	237	return -ENOMEM;
	238
	239	cn->id.idx = CN_W1_IDX;
	240	cn->id.val = CN_W1_VAL;
	241
	242	cn->seq = msg->seq;
	243	cn->ack = 1;
	244	cn->len = sizeof(struct w1_netlink_msg);
	245	w = (struct w1_netlink_msg *)(cn + 1);
	246
	247	w->type = W1_LIST_MASTERS;
4037014e	248	w->status = 0;
610705e7 EP	249	w->len = 0;
	250	id = (u32 *)(w + 1);
	251
	252	mutex_lock(&w1_mlock);
	253	list_for_each_entry(m, &w1_masters, w1_master_entry) {
	254	if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
	255	cn_netlink_send(cn, 0, GFP_KERNEL);
	256	cn->ack++;
	257	cn->len = sizeof(struct w1_netlink_msg);
	258	w->len = 0;
	259	id = (u32 *)(w + 1);
	260	}
	261
	262	*id = m->id;
	263	w->len += sizeof(*id);
	264	cn->len += sizeof(*id);
	265	id++;
	266	}
	267	cn->ack = 0;
	268	cn_netlink_send(cn, 0, GFP_KERNEL);
	269	mutex_unlock(&w1_mlock);
	270
	271	kfree(cn);
	272	return 0;
	273	}
	274
4037014e EP	275	static int w1_netlink_send_error(struct cn_msg rcmsg, struct w1_netlink_msg rmsg,
	276	struct w1_netlink_cmd *rcmd, int error)
	277	{
	278	struct cn_msg *cmsg;
	279	struct w1_netlink_msg *msg;
	280	struct w1_netlink_cmd *cmd;
	281
	282	cmsg = kzalloc(sizeof(msg) + sizeof(cmd) + sizeof(*cmsg), GFP_KERNEL);
	283	if (!cmsg)
	284	return -ENOMEM;
	285
	286	msg = (struct w1_netlink_msg *)(cmsg + 1);
	287	cmd = (struct w1_netlink_cmd *)(msg + 1);
	288
	289	memcpy(cmsg, rcmsg, sizeof(*cmsg));
	290	cmsg->len = sizeof(*msg);
	291
	292	memcpy(msg, rmsg, sizeof(*msg));
	293	msg->len = 0;
	294	msg->status = (short)-error;
	295
	296	if (rcmd) {
	297	memcpy(cmd, rcmd, sizeof(*cmd));
	298	cmd->len = 0;
	299	msg->len += sizeof(*cmd);
	300	cmsg->len += sizeof(*cmd);
	301	}
	302
	303	error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
	304	kfree(cmsg);
	305
	306	return error;
	307	}
	308
7069331d	309	static void w1_cn_callback(struct cn_msg msg, struct netlink_skb_parms nsp)
12003375	310	{
12003375 EP	311	struct w1_netlink_msg m = (struct w1_netlink_msg )(msg + 1);
	312	struct w1_netlink_cmd *cmd;
	313	struct w1_slave *sl;
	314	struct w1_master *dev;
	315	int err = 0;
	316
	317	while (msg->len && !err) {
	318	struct w1_reg_num id;
	319	u16 mlen = m->len;
	320	u8 *cmd_data = m->data;
	321
	322	dev = NULL;
	323	sl = NULL;
4037014e	324	cmd = NULL;
12003375 EP	325
	326	memcpy(&id, m->id.id, sizeof(id));
	327	#if 0
	328	printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
	329	__func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
	330	#endif
	331	if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
	332	err = -E2BIG;
	333	break;
	334	}
	335
12003375 EP	336	if (m->type == W1_MASTER_CMD) {
	337	dev = w1_search_master_id(m->id.mst.id);
	338	} else if (m->type == W1_SLAVE_CMD) {
	339	sl = w1_search_slave(&id);
	340	if (sl)
	341	dev = sl->master;
610705e7 EP	342	} else {
	343	err = w1_process_command_root(msg, m);
	344	goto out_cont;
12003375 EP	345	}
	346
	347	if (!dev) {
	348	err = -ENODEV;
	349	goto out_cont;
	350	}
	351
9be62e0b EP	352	err = 0;
	353	if (!mlen)
	354	goto out_cont;
	355
abd52a13	356	mutex_lock(&dev->mutex);
12003375 EP	357
	358	if (sl && w1_reset_select_slave(sl)) {
	359	err = -ENODEV;
	360	goto out_up;
	361	}
	362
	363	while (mlen) {
	364	cmd = (struct w1_netlink_cmd *)cmd_data;
	365
	366	if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
	367	err = -E2BIG;
	368	break;
	369	}
	370
	371	if (sl)
4037014e	372	err = w1_process_command_slave(sl, msg, m, cmd);
12003375	373	else
4037014e EP	374	err = w1_process_command_master(dev, msg, m, cmd);
	375
	376	w1_netlink_send_error(msg, m, cmd, err);
	377	err = 0;
12003375 EP	378
	379	cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
	380	mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
	381	}
	382	out_up:
	383	atomic_dec(&dev->refcnt);
	384	if (sl)
	385	atomic_dec(&sl->refcnt);
abd52a13	386	mutex_unlock(&dev->mutex);
12003375	387	out_cont:
4037014e EP	388	if (!cmd \|\| err)
4037014e EP	389	w1_netlink_send_error(msg, m, cmd, err);
12003375 EP	390	msg->len -= sizeof(struct w1_netlink_msg) + m->len;
	391	m = (struct w1_netlink_msg )(((u8 )m) + sizeof(struct w1_netlink_msg) + m->len);
	392
	393	/*
	394	* Let's allow requests for nonexisting devices.
	395	*/
	396	if (err == -ENODEV)
	397	err = 0;
	398	}
2d833179 EP	399	}
2d833179 EP	400
12003375	401	int w1_init_netlink(void)
2d833179	402	{
12003375 EP	403	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	404
	405	return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
	406	}
	407
	408	void w1_fini_netlink(void)
	409	{
	410	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	411
	412	cn_del_callback(&w1_id);
2d833179	413	}
1da177e4	414	#else
1da177e4 LT	415	void w1_netlink_send(struct w1_master dev, struct w1_netlink_msg msg)
	416	{
	417	}
2d833179	418
12003375	419	int w1_init_netlink(void)
2d833179 EP	420	{
	421	return 0;
	422	}
	423
12003375	424	void w1_fini_netlink(void)
2d833179 EP	425	{
2d833179 EP	426	}
1da177e4	427	#endif