[GitHub/mt8127/android_kernel_alcatel_ttab.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/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;

	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
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
	58	avail = dev->priv_size - cmd->len;
	59
	60	if (avail > 8) {
	61	u64 data = (void )(cmd + 1) + cmd->len;
	62
	63	*data = rn;
	64	cmd->len += 8;
	65	hdr->len += 8;
	66	msg->len += 8;
	67	return;
	68	}
	69
	70	msg->ack++;
	71	cn_netlink_send(msg, 0, GFP_KERNEL);
	72
	73	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
	74	hdr->len = sizeof(struct w1_netlink_cmd);
	75	cmd->len = 0;
	76	}
	77
	78	static int w1_process_search_command(struct w1_master dev, struct cn_msg msg,
	79	unsigned int avail)
12003375	80	{
3b838407 EP	81	struct w1_netlink_msg hdr = (struct w1_netlink_msg )(msg + 1);
	82	struct w1_netlink_cmd cmd = (struct w1_netlink_cmd )(hdr + 1);
	83	int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH;
1da177e4	84
3b838407 EP	85	dev->priv = msg;
	86	dev->priv_size = avail;
	87
	88	w1_search_devices(dev, search_type, w1_send_slave);
	89
	90	msg->ack = 0;
	91	cn_netlink_send(msg, 0, GFP_KERNEL);
	92
	93	dev->priv = NULL;
	94	dev->priv_size = 0;
1da177e4	95
12003375	96	return 0;
1da177e4	97	}
2d833179	98
c7e26631 EP	99	static int w1_send_read_reply(struct cn_msg msg, struct w1_netlink_msg hdr,
c7e26631 EP	100	struct w1_netlink_cmd *cmd)
2d833179	101	{
12003375 EP	102	void *data;
	103	struct w1_netlink_msg *h;
	104	struct w1_netlink_cmd *c;
	105	struct cn_msg *cm;
	106	int err;
	107
	108	data = kzalloc(sizeof(struct cn_msg) +
	109	sizeof(struct w1_netlink_msg) +
	110	sizeof(struct w1_netlink_cmd) +
	111	cmd->len, GFP_KERNEL);
	112	if (!data)
	113	return -ENOMEM;
	114
	115	cm = (struct cn_msg *)(data);
	116	h = (struct w1_netlink_msg *)(cm + 1);
	117	c = (struct w1_netlink_cmd *)(h + 1);
	118
	119	memcpy(cm, msg, sizeof(struct cn_msg));
	120	memcpy(h, hdr, sizeof(struct w1_netlink_msg));
	121	memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
	122
	123	cm->ack = msg->seq+1;
c7e26631 EP	124	cm->len = sizeof(struct w1_netlink_msg) +
c7e26631 EP	125	sizeof(struct w1_netlink_cmd) + cmd->len;
12003375 EP	126
	127	h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
	128
	129	memcpy(c->data, cmd->data, c->len);
	130
	131	err = cn_netlink_send(cm, 0, GFP_KERNEL);
	132
	133	kfree(data);
	134
	135	return err;
	136	}
	137
c7e26631	138	static int w1_process_command_io(struct w1_master dev, struct cn_msg msg,
12003375 EP	139	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	140	{
	141	int err = 0;
	142
c7e26631 EP	143	switch (cmd->cmd) {
	144	case W1_CMD_TOUCH:
	145	w1_touch_block(dev, cmd->data, cmd->len);
	146	w1_send_read_reply(msg, hdr, cmd);
	147	break;
	148	case W1_CMD_READ:
	149	w1_read_block(dev, cmd->data, cmd->len);
	150	w1_send_read_reply(msg, hdr, cmd);
	151	break;
	152	case W1_CMD_WRITE:
	153	w1_write_block(dev, cmd->data, cmd->len);
	154	break;
	155	default:
4037014e	156	err = -EINVAL;
c7e26631 EP	157	break;
	158	}
	159
	160	return err;
	161	}
	162
	163	static int w1_process_command_master(struct w1_master dev, struct cn_msg req_msg,
	164	struct w1_netlink_msg req_hdr, struct w1_netlink_cmd req_cmd)
	165	{
	166	int err = -EINVAL;
	167	struct cn_msg *msg;
	168	struct w1_netlink_msg *hdr;
	169	struct w1_netlink_cmd *cmd;
	170
	171	msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
	172	if (!msg)
	173	return -ENOMEM;
	174
	175	msg->id = req_msg->id;
	176	msg->seq = req_msg->seq;
	177	msg->ack = 0;
	178	msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd);
	179
	180	hdr = (struct w1_netlink_msg *)(msg + 1);
	181	cmd = (struct w1_netlink_cmd *)(hdr + 1);
	182
	183	hdr->type = W1_MASTER_CMD;
	184	hdr->id = req_hdr->id;
	185	hdr->len = sizeof(struct w1_netlink_cmd);
	186
	187	cmd->cmd = req_cmd->cmd;
	188	cmd->len = 0;
12003375 EP	189
12003375 EP	190	switch (cmd->cmd) {
c7e26631 EP	191	case W1_CMD_SEARCH:
	192	case W1_CMD_ALARM_SEARCH:
	193	err = w1_process_search_command(dev, msg,
	194	PAGE_SIZE - msg->len - sizeof(struct cn_msg));
	195	break;
	196	case W1_CMD_READ:
	197	case W1_CMD_WRITE:
	198	case W1_CMD_TOUCH:
4037014e	199	err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
c7e26631	200	break;
f89735c4 EP	201	case W1_CMD_RESET:
	202	err = w1_reset_bus(dev);
	203	break;
c7e26631	204	default:
4037014e	205	err = -EINVAL;
c7e26631	206	break;
2d833179 EP	207	}
2d833179 EP	208
c7e26631	209	kfree(msg);
12003375 EP	210	return err;
	211	}
	212
c7e26631 EP	213	static int w1_process_command_slave(struct w1_slave sl, struct cn_msg msg,
	214	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	215	{
	216	dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
	217	__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
	218	sl->reg_num.crc, cmd->cmd, cmd->len);
	219
	220	return w1_process_command_io(sl->master, msg, hdr, cmd);
	221	}
	222
610705e7 EP	223	static int w1_process_command_root(struct cn_msg msg, struct w1_netlink_msg mcmd)
	224	{
	225	struct w1_master *m;
	226	struct cn_msg *cn;
	227	struct w1_netlink_msg *w;
	228	u32 *id;
	229
	230	if (mcmd->type != W1_LIST_MASTERS) {
	231	printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n",
c7e26631	232	__func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len);
610705e7 EP	233	return -EPROTO;
	234	}
	235
	236	cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
	237	if (!cn)
	238	return -ENOMEM;
	239
	240	cn->id.idx = CN_W1_IDX;
	241	cn->id.val = CN_W1_VAL;
	242
	243	cn->seq = msg->seq;
	244	cn->ack = 1;
	245	cn->len = sizeof(struct w1_netlink_msg);
	246	w = (struct w1_netlink_msg *)(cn + 1);
	247
	248	w->type = W1_LIST_MASTERS;
4037014e	249	w->status = 0;
610705e7 EP	250	w->len = 0;
	251	id = (u32 *)(w + 1);
	252
	253	mutex_lock(&w1_mlock);
	254	list_for_each_entry(m, &w1_masters, w1_master_entry) {
	255	if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
	256	cn_netlink_send(cn, 0, GFP_KERNEL);
	257	cn->ack++;
	258	cn->len = sizeof(struct w1_netlink_msg);
	259	w->len = 0;
	260	id = (u32 *)(w + 1);
	261	}
	262
	263	*id = m->id;
	264	w->len += sizeof(*id);
	265	cn->len += sizeof(*id);
	266	id++;
	267	}
	268	cn->ack = 0;
	269	cn_netlink_send(cn, 0, GFP_KERNEL);
	270	mutex_unlock(&w1_mlock);
	271
	272	kfree(cn);
	273	return 0;
	274	}
	275
4037014e EP	276	static int w1_netlink_send_error(struct cn_msg rcmsg, struct w1_netlink_msg rmsg,
	277	struct w1_netlink_cmd *rcmd, int error)
	278	{
	279	struct cn_msg *cmsg;
	280	struct w1_netlink_msg *msg;
	281	struct w1_netlink_cmd *cmd;
	282
	283	cmsg = kzalloc(sizeof(msg) + sizeof(cmd) + sizeof(*cmsg), GFP_KERNEL);
	284	if (!cmsg)
	285	return -ENOMEM;
	286
	287	msg = (struct w1_netlink_msg *)(cmsg + 1);
	288	cmd = (struct w1_netlink_cmd *)(msg + 1);
	289
	290	memcpy(cmsg, rcmsg, sizeof(*cmsg));
	291	cmsg->len = sizeof(*msg);
	292
	293	memcpy(msg, rmsg, sizeof(*msg));
	294	msg->len = 0;
	295	msg->status = (short)-error;
	296
	297	if (rcmd) {
	298	memcpy(cmd, rcmd, sizeof(*cmd));
	299	cmd->len = 0;
	300	msg->len += sizeof(*cmd);
	301	cmsg->len += sizeof(*cmd);
	302	}
	303
	304	error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
	305	kfree(cmsg);
	306
	307	return error;
	308	}
	309
7069331d	310	static void w1_cn_callback(struct cn_msg msg, struct netlink_skb_parms nsp)
12003375	311	{
12003375 EP	312	struct w1_netlink_msg m = (struct w1_netlink_msg )(msg + 1);
	313	struct w1_netlink_cmd *cmd;
	314	struct w1_slave *sl;
	315	struct w1_master *dev;
	316	int err = 0;
	317
	318	while (msg->len && !err) {
	319	struct w1_reg_num id;
	320	u16 mlen = m->len;
	321	u8 *cmd_data = m->data;
	322
	323	dev = NULL;
	324	sl = NULL;
4037014e	325	cmd = NULL;
12003375 EP	326
	327	memcpy(&id, m->id.id, sizeof(id));
	328	#if 0
	329	printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",
	330	__func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);
	331	#endif
	332	if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {
	333	err = -E2BIG;
	334	break;
	335	}
	336
12003375 EP	337	if (m->type == W1_MASTER_CMD) {
	338	dev = w1_search_master_id(m->id.mst.id);
	339	} else if (m->type == W1_SLAVE_CMD) {
	340	sl = w1_search_slave(&id);
	341	if (sl)
	342	dev = sl->master;
610705e7 EP	343	} else {
	344	err = w1_process_command_root(msg, m);
	345	goto out_cont;
12003375 EP	346	}
	347
	348	if (!dev) {
	349	err = -ENODEV;
	350	goto out_cont;
	351	}
	352
9be62e0b EP	353	err = 0;
	354	if (!mlen)
	355	goto out_cont;
	356
abd52a13	357	mutex_lock(&dev->mutex);
12003375 EP	358
	359	if (sl && w1_reset_select_slave(sl)) {
	360	err = -ENODEV;
	361	goto out_up;
	362	}
	363
	364	while (mlen) {
	365	cmd = (struct w1_netlink_cmd *)cmd_data;
	366
	367	if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
	368	err = -E2BIG;
	369	break;
	370	}
	371
	372	if (sl)
4037014e	373	err = w1_process_command_slave(sl, msg, m, cmd);
12003375	374	else
4037014e EP	375	err = w1_process_command_master(dev, msg, m, cmd);
	376
	377	w1_netlink_send_error(msg, m, cmd, err);
	378	err = 0;
12003375 EP	379
	380	cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
	381	mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
	382	}
	383	out_up:
	384	atomic_dec(&dev->refcnt);
	385	if (sl)
	386	atomic_dec(&sl->refcnt);
abd52a13	387	mutex_unlock(&dev->mutex);
12003375	388	out_cont:
4037014e EP	389	if (!cmd \|\| err)
4037014e EP	390	w1_netlink_send_error(msg, m, cmd, err);
12003375 EP	391	msg->len -= sizeof(struct w1_netlink_msg) + m->len;
	392	m = (struct w1_netlink_msg )(((u8 )m) + sizeof(struct w1_netlink_msg) + m->len);
	393
	394	/*
	395	* Let's allow requests for nonexisting devices.
	396	*/
	397	if (err == -ENODEV)
	398	err = 0;
	399	}
2d833179 EP	400	}
2d833179 EP	401
12003375	402	int w1_init_netlink(void)
2d833179	403	{
12003375 EP	404	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	405
	406	return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
	407	}
	408
	409	void w1_fini_netlink(void)
	410	{
	411	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	412
	413	cn_del_callback(&w1_id);
2d833179	414	}
1da177e4	415	#else
1da177e4 LT	416	void w1_netlink_send(struct w1_master dev, struct w1_netlink_msg msg)
	417	{
	418	}
2d833179	419
12003375	420	int w1_init_netlink(void)
2d833179 EP	421	{
	422	return 0;
	423	}
	424
12003375	425	void w1_fini_netlink(void)
2d833179 EP	426	{
2d833179 EP	427	}
1da177e4	428	#endif