[linux.git] / drivers / w1 / w1_netlink.c

/*
 * w1_netlink.c
 *
 * Copyright (c) 2003 Evgeniy Polyakov <[email protected]>
 *
 *
 * 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;

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

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