[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / w1 / w1_netlink.c

/*
 * w1_netlink.c
 *
 * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
 *
 *
 * 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/slab.h>
#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;
	u64 *data;

	/* update kernel slave list */
	w1_slave_found(dev, rn);

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

	if (avail < 8) {
		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;
	}

	data = (void *)(cmd + 1) + cmd->len;

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

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_process_cb(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	*
a8018766	4	* Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net>
1da177e4 LT	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
5a0e3ad6	22	#include <linux/slab.h>
1da177e4 LT	23	#include <linux/skbuff.h>
1da177e4 LT	24	#include <linux/netlink.h>
12003375	25	#include <linux/connector.h>
1da177e4 LT	26
	27	#include "w1.h"
	28	#include "w1_log.h"
	29	#include "w1_netlink.h"
	30
46e07f6e	31	#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) \|\| (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))
1da177e4 LT	32	void w1_netlink_send(struct w1_master dev, struct w1_netlink_msg msg)
1da177e4 LT	33	{
12003375 EP	34	char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];
	35	struct cn_msg m = (struct cn_msg )buf;
	36	struct w1_netlink_msg w = (struct w1_netlink_msg )(m+1);
1da177e4	37
12003375	38	memset(buf, 0, sizeof(buf));
1da177e4	39
12003375 EP	40	m->id.idx = CN_W1_IDX;
12003375 EP	41	m->id.val = CN_W1_VAL;
1da177e4	42
12003375 EP	43	m->seq = dev->seq++;
12003375 EP	44	m->len = sizeof(struct w1_netlink_msg);
1da177e4	45
12003375	46	memcpy(w, msg, sizeof(struct w1_netlink_msg));
1da177e4	47
12003375 EP	48	cn_netlink_send(m, 0, GFP_KERNEL);
12003375 EP	49	}
1da177e4	50
3b838407 EP	51	static void w1_send_slave(struct w1_master *dev, u64 rn)
	52	{
	53	struct cn_msg *msg = dev->priv;
	54	struct w1_netlink_msg hdr = (struct w1_netlink_msg )(msg + 1);
	55	struct w1_netlink_cmd cmd = (struct w1_netlink_cmd )(hdr + 1);
	56	int avail;
1a8be0fe	57	u64 *data;
3b838407	58
963bb101 DF	59	/* update kernel slave list */
	60	w1_slave_found(dev, rn);
	61
3b838407 EP	62	avail = dev->priv_size - cmd->len;
3b838407 EP	63
1a8be0fe DF	64	if (avail < 8) {
	65	msg->ack++;
	66	cn_netlink_send(msg, 0, GFP_KERNEL);
3b838407	67
1a8be0fe DF	68	msg->len = sizeof(struct w1_netlink_msg) +
	69	sizeof(struct w1_netlink_cmd);
	70	hdr->len = sizeof(struct w1_netlink_cmd);
	71	cmd->len = 0;
3b838407 EP	72	}
3b838407 EP	73
1a8be0fe	74	data = (void *)(cmd + 1) + cmd->len;
3b838407	75
1a8be0fe DF	76	*data = rn;
	77	cmd->len += 8;
	78	hdr->len += 8;
	79	msg->len += 8;
3b838407 EP	80	}
	81
	82	static int w1_process_search_command(struct w1_master dev, struct cn_msg msg,
	83	unsigned int avail)
12003375	84	{
3b838407 EP	85	struct w1_netlink_msg hdr = (struct w1_netlink_msg )(msg + 1);
	86	struct w1_netlink_cmd cmd = (struct w1_netlink_cmd )(hdr + 1);
	87	int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
1da177e4	88
3b838407 EP	89	dev->priv = msg;
	90	dev->priv_size = avail;
	91
963bb101	92	w1_search_process_cb(dev, search_type, w1_send_slave);
3b838407 EP	93
	94	msg->ack = 0;
	95	cn_netlink_send(msg, 0, GFP_KERNEL);
	96
	97	dev->priv = NULL;
	98	dev->priv_size = 0;
1da177e4	99
12003375	100	return 0;
1da177e4	101	}
2d833179	102
c7e26631 EP	103	static int w1_send_read_reply(struct cn_msg msg, struct w1_netlink_msg hdr,
c7e26631 EP	104	struct w1_netlink_cmd *cmd)
2d833179	105	{
12003375 EP	106	void *data;
	107	struct w1_netlink_msg *h;
	108	struct w1_netlink_cmd *c;
	109	struct cn_msg *cm;
	110	int err;
	111
	112	data = kzalloc(sizeof(struct cn_msg) +
	113	sizeof(struct w1_netlink_msg) +
	114	sizeof(struct w1_netlink_cmd) +
	115	cmd->len, GFP_KERNEL);
	116	if (!data)
	117	return -ENOMEM;
	118
	119	cm = (struct cn_msg *)(data);
	120	h = (struct w1_netlink_msg *)(cm + 1);
	121	c = (struct w1_netlink_cmd *)(h + 1);
	122
	123	memcpy(cm, msg, sizeof(struct cn_msg));
	124	memcpy(h, hdr, sizeof(struct w1_netlink_msg));
	125	memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
	126
	127	cm->ack = msg->seq+1;
c7e26631 EP	128	cm->len = sizeof(struct w1_netlink_msg) +
c7e26631 EP	129	sizeof(struct w1_netlink_cmd) + cmd->len;
12003375 EP	130
	131	h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
	132
	133	memcpy(c->data, cmd->data, c->len);
	134
	135	err = cn_netlink_send(cm, 0, GFP_KERNEL);
	136
	137	kfree(data);
	138
	139	return err;
	140	}
	141
c7e26631	142	static int w1_process_command_io(struct w1_master dev, struct cn_msg msg,
12003375 EP	143	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	144	{
	145	int err = 0;
	146
c7e26631 EP	147	switch (cmd->cmd) {
	148	case W1_CMD_TOUCH:
	149	w1_touch_block(dev, cmd->data, cmd->len);
	150	w1_send_read_reply(msg, hdr, cmd);
	151	break;
	152	case W1_CMD_READ:
	153	w1_read_block(dev, cmd->data, cmd->len);
	154	w1_send_read_reply(msg, hdr, cmd);
	155	break;
	156	case W1_CMD_WRITE:
	157	w1_write_block(dev, cmd->data, cmd->len);
	158	break;
	159	default:
4037014e	160	err = -EINVAL;
c7e26631 EP	161	break;
	162	}
	163
	164	return err;
	165	}
	166
	167	static int w1_process_command_master(struct w1_master dev, struct cn_msg req_msg,
	168	struct w1_netlink_msg req_hdr, struct w1_netlink_cmd req_cmd)
	169	{
	170	int err = -EINVAL;
	171	struct cn_msg *msg;
	172	struct w1_netlink_msg *hdr;
	173	struct w1_netlink_cmd *cmd;
	174
	175	msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
	176	if (!msg)
	177	return -ENOMEM;
	178
	179	msg->id = req_msg->id;
	180	msg->seq = req_msg->seq;
	181	msg->ack = 0;
	182	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
	183
	184	hdr = (struct w1_netlink_msg *)(msg + 1);
	185	cmd = (struct w1_netlink_cmd *)(hdr + 1);
	186
	187	hdr->type = W1_MASTER_CMD;
	188	hdr->id = req_hdr->id;
	189	hdr->len = sizeof(struct w1_netlink_cmd);
	190
	191	cmd->cmd = req_cmd->cmd;
	192	cmd->len = 0;
12003375 EP	193
12003375 EP	194	switch (cmd->cmd) {
c7e26631 EP	195	case W1_CMD_SEARCH:
	196	case W1_CMD_ALARM_SEARCH:
	197	err = w1_process_search_command(dev, msg,
	198	PAGE_SIZE - msg->len - sizeof(struct cn_msg));
	199	break;
	200	case W1_CMD_READ:
	201	case W1_CMD_WRITE:
	202	case W1_CMD_TOUCH:
4037014e	203	err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
c7e26631	204	break;
f89735c4 EP	205	case W1_CMD_RESET:
	206	err = w1_reset_bus(dev);
	207	break;
c7e26631	208	default:
4037014e	209	err = -EINVAL;
c7e26631	210	break;
2d833179 EP	211	}
2d833179 EP	212
c7e26631	213	kfree(msg);
12003375 EP	214	return err;
	215	}
	216
c7e26631 EP	217	static int w1_process_command_slave(struct w1_slave sl, struct cn_msg msg,
	218	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	219	{
	220	dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
	221	__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
	222	sl->reg_num.crc, cmd->cmd, cmd->len);
	223
	224	return w1_process_command_io(sl->master, msg, hdr, cmd);
	225	}
	226
610705e7 EP	227	static int w1_process_command_root(struct cn_msg msg, struct w1_netlink_msg mcmd)
	228	{
	229	struct w1_master *m;
	230	struct cn_msg *cn;
	231	struct w1_netlink_msg *w;
	232	u32 *id;
	233
	234	if (mcmd->type != W1_LIST_MASTERS) {
	235	printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
c7e26631	236	__func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
610705e7 EP	237	return -EPROTO;
	238	}
	239
	240	cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
	241	if (!cn)
	242	return -ENOMEM;
	243
	244	cn->id.idx = CN_W1_IDX;
	245	cn->id.val = CN_W1_VAL;
	246
	247	cn->seq = msg->seq;
	248	cn->ack = 1;
	249	cn->len = sizeof(struct w1_netlink_msg);
	250	w = (struct w1_netlink_msg *)(cn + 1);
	251
	252	w->type = W1_LIST_MASTERS;
4037014e	253	w->status = 0;
610705e7 EP	254	w->len = 0;
	255	id = (u32 *)(w + 1);
	256
	257	mutex_lock(&w1_mlock);
	258	list_for_each_entry(m, &w1_masters, w1_master_entry) {
	259	if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
	260	cn_netlink_send(cn, 0, GFP_KERNEL);
	261	cn->ack++;
	262	cn->len = sizeof(struct w1_netlink_msg);
	263	w->len = 0;
	264	id = (u32 *)(w + 1);
	265	}
	266
	267	*id = m->id;
	268	w->len += sizeof(*id);
	269	cn->len += sizeof(*id);
	270	id++;
	271	}
	272	cn->ack = 0;
	273	cn_netlink_send(cn, 0, GFP_KERNEL);
	274	mutex_unlock(&w1_mlock);
	275
	276	kfree(cn);
	277	return 0;
	278	}
	279
4037014e EP	280	static int w1_netlink_send_error(struct cn_msg rcmsg, struct w1_netlink_msg rmsg,
	281	struct w1_netlink_cmd *rcmd, int error)
	282	{
	283	struct cn_msg *cmsg;
	284	struct w1_netlink_msg *msg;
	285	struct w1_netlink_cmd *cmd;
	286
	287	cmsg = kzalloc(sizeof(msg) + sizeof(cmd) + sizeof(*cmsg), GFP_KERNEL);
	288	if (!cmsg)
	289	return -ENOMEM;
	290
	291	msg = (struct w1_netlink_msg *)(cmsg + 1);
	292	cmd = (struct w1_netlink_cmd *)(msg + 1);
	293
	294	memcpy(cmsg, rcmsg, sizeof(*cmsg));
	295	cmsg->len = sizeof(*msg);
	296
	297	memcpy(msg, rmsg, sizeof(*msg));
	298	msg->len = 0;
	299	msg->status = (short)-error;
	300
	301	if (rcmd) {
	302	memcpy(cmd, rcmd, sizeof(*cmd));
	303	cmd->len = 0;
	304	msg->len += sizeof(*cmd);
	305	cmsg->len += sizeof(*cmd);
	306	}
	307
	308	error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
	309	kfree(cmsg);
	310
	311	return error;
	312	}
	313
7069331d	314	static void w1_cn_callback(struct cn_msg msg, struct netlink_skb_parms nsp)
12003375	315	{
12003375 EP	316	struct w1_netlink_msg m = (struct w1_netlink_msg )(msg + 1);
	317	struct w1_netlink_cmd *cmd;
	318	struct w1_slave *sl;
	319	struct w1_master *dev;
	320	int err = 0;
	321
	322	while (msg->len && !err) {
	323	struct w1_reg_num id;
	324	u16 mlen = m->len;
	325	u8 *cmd_data = m->data;
	326
	327	dev = NULL;
	328	sl = NULL;
4037014e	329	cmd = NULL;
12003375 EP	330
	331	memcpy(&id, m->id.id, sizeof(id));
	332	#if 0
	333	printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
	334	__func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
	335	#endif
	336	if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
	337	err = -E2BIG;
	338	break;
	339	}
	340
12003375 EP	341	if (m->type == W1_MASTER_CMD) {
	342	dev = w1_search_master_id(m->id.mst.id);
	343	} else if (m->type == W1_SLAVE_CMD) {
	344	sl = w1_search_slave(&id);
	345	if (sl)
	346	dev = sl->master;
610705e7 EP	347	} else {
	348	err = w1_process_command_root(msg, m);
	349	goto out_cont;
12003375 EP	350	}
	351
	352	if (!dev) {
	353	err = -ENODEV;
	354	goto out_cont;
	355	}
	356
9be62e0b EP	357	err = 0;
	358	if (!mlen)
	359	goto out_cont;
	360
abd52a13	361	mutex_lock(&dev->mutex);
12003375 EP	362
	363	if (sl && w1_reset_select_slave(sl)) {
	364	err = -ENODEV;
	365	goto out_up;
	366	}
	367
	368	while (mlen) {
	369	cmd = (struct w1_netlink_cmd *)cmd_data;
	370
	371	if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
	372	err = -E2BIG;
	373	break;
	374	}
	375
	376	if (sl)
4037014e	377	err = w1_process_command_slave(sl, msg, m, cmd);
12003375	378	else
4037014e EP	379	err = w1_process_command_master(dev, msg, m, cmd);
	380
	381	w1_netlink_send_error(msg, m, cmd, err);
	382	err = 0;
12003375 EP	383
	384	cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
	385	mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
	386	}
	387	out_up:
	388	atomic_dec(&dev->refcnt);
	389	if (sl)
	390	atomic_dec(&sl->refcnt);
abd52a13	391	mutex_unlock(&dev->mutex);
12003375	392	out_cont:
4037014e EP	393	if (!cmd \|\| err)
4037014e EP	394	w1_netlink_send_error(msg, m, cmd, err);
12003375 EP	395	msg->len -= sizeof(struct w1_netlink_msg) + m->len;
	396	m = (struct w1_netlink_msg )(((u8 )m) + sizeof(struct w1_netlink_msg) + m->len);
	397
	398	/*
	399	* Let's allow requests for nonexisting devices.
	400	*/
	401	if (err == -ENODEV)
	402	err = 0;
	403	}
2d833179 EP	404	}
2d833179 EP	405
12003375	406	int w1_init_netlink(void)
2d833179	407	{
12003375 EP	408	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	409
	410	return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
	411	}
	412
	413	void w1_fini_netlink(void)
	414	{
	415	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	416
	417	cn_del_callback(&w1_id);
2d833179	418	}
1da177e4	419	#else
1da177e4 LT	420	void w1_netlink_send(struct w1_master dev, struct w1_netlink_msg msg)
	421	{
	422	}
2d833179	423
12003375	424	int w1_init_netlink(void)
2d833179 EP	425	{
	426	return 0;
	427	}
	428
12003375	429	void w1_fini_netlink(void)
2d833179 EP	430	{
2d833179 EP	431	}
1da177e4	432	#endif