[deliverable/linux.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, dev->portid, 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;

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

	if (avail < 8) {
		msg->ack++;
		cn_netlink_send(msg, dev->portid, 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 void w1_found_send_slave(struct w1_master *dev, u64 rn)
{
	/* update kernel slave list */
	w1_slave_found(dev, rn);

	w1_send_slave(dev, rn);
}

/* Get the current slave list, or search (with or without alarm) */
static int w1_get_slaves(struct w1_master *dev,
		struct cn_msg *req_msg, struct w1_netlink_msg *req_hdr,
		struct w1_netlink_cmd *req_cmd)
{
	struct cn_msg *msg;
	struct w1_netlink_msg *hdr;
	struct w1_netlink_cmd *cmd;
	struct w1_slave *sl;

	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;

	dev->priv = msg;
	dev->priv_size = PAGE_SIZE - msg->len - sizeof(struct cn_msg);

	if (req_cmd->cmd == W1_CMD_LIST_SLAVES) {
		__u64 rn;
		mutex_lock(&dev->list_mutex);
		list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
			memcpy(&rn, &sl->reg_num, sizeof(rn));
			w1_send_slave(dev, rn);
		}
		mutex_unlock(&dev->list_mutex);
	} else {
		w1_search_process_cb(dev, cmd->cmd == W1_CMD_ALARM_SEARCH ?
			W1_ALARM_SEARCH : W1_SEARCH, w1_found_send_slave);
	}

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

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

	kfree(msg);

	return 0;
}

static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
		struct w1_netlink_cmd *cmd, u32 portid)
{
	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, portid, 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, dev->portid);
		break;
	case W1_CMD_READ:
		w1_read_block(dev, cmd->data, cmd->len);
		w1_send_read_reply(msg, hdr, cmd, dev->portid);
		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_addremove(struct w1_master *dev,
	struct cn_msg *msg, struct w1_netlink_msg *hdr,
	struct w1_netlink_cmd *cmd)
{
	struct w1_slave *sl;
	int err = 0;
	struct w1_reg_num *id;

	if (cmd->len != 8)
		return -EINVAL;

	id = (struct w1_reg_num *)cmd->data;

	sl = w1_slave_search_device(dev, id);
	switch (cmd->cmd) {
	case W1_CMD_SLAVE_ADD:
		if (sl)
			err = -EINVAL;
		else
			err = w1_attach_slave_device(dev, id);
		break;
	case W1_CMD_SLAVE_REMOVE:
		if (sl)
			w1_slave_detach(sl);
		else
			err = -EINVAL;
		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;

	/* drop bus_mutex for search (does it's own locking), and add/remove
	 * which doesn't use the bus
	 */
	switch (req_cmd->cmd) {
	case W1_CMD_SEARCH:
	case W1_CMD_ALARM_SEARCH:
	case W1_CMD_LIST_SLAVES:
		mutex_unlock(&dev->bus_mutex);
		err = w1_get_slaves(dev, req_msg, req_hdr, req_cmd);
		mutex_lock(&dev->bus_mutex);
		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;
	case W1_CMD_SLAVE_ADD:
	case W1_CMD_SLAVE_REMOVE:
		mutex_unlock(&dev->bus_mutex);
		mutex_lock(&dev->mutex);
		err = w1_process_command_addremove(dev, req_msg, req_hdr,
			req_cmd);
		mutex_unlock(&dev->mutex);
		mutex_lock(&dev->bus_mutex);
		break;
	default:
		err = -EINVAL;
		break;
	}

	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, u32 portid)
{
	struct w1_master *m;
	struct cn_msg *cn;
	struct w1_netlink_msg *w;
	u32 *id;

	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, portid, 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, portid, 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 portid, 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, portid, 0, GFP_KERNEL);
	kfree(cmsg);

	return error;
}

/* Bundle together a reference count, the full message, and broken out
 * commands to be executed on each w1 master kthread in one memory allocation.
 */
struct w1_cb_block {
	atomic_t refcnt;
	u32 portid; /* Sending process port ID */
	struct cn_msg msg;
	/* cn_msg data */
	/* one or more variable length struct w1_cb_node */
};
struct w1_cb_node {
	struct w1_async_cmd async;
	/* pointers within w1_cb_block and msg data */
	struct w1_cb_block *block;
	struct w1_netlink_msg *m;
	struct w1_slave *sl;
	struct w1_master *dev;
};

static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
{
	struct w1_cb_node *node = container_of(async_cmd, struct w1_cb_node,
		async);
	u16 mlen = node->m->len;
	u8 *cmd_data = node->m->data;
	int err = 0;
	struct w1_slave *sl = node->sl;
	struct w1_netlink_cmd *cmd = NULL;

	mutex_lock(&dev->bus_mutex);
	dev->portid = node->block->portid;
	if (sl && w1_reset_select_slave(sl))
		err = -ENODEV;

	while (mlen && !err) {
		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, &node->block->msg,
				node->m, cmd);
		else
			err = w1_process_command_master(dev, &node->block->msg,
				node->m, cmd);

		w1_netlink_send_error(&node->block->msg, node->m, cmd,
			node->block->portid, err);
		err = 0;

		cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
		mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
	}

	if (!cmd || err)
		w1_netlink_send_error(&node->block->msg, node->m, cmd,
			node->block->portid, err);

	/* ref taken in w1_search_slave or w1_search_master_id when building
	 * the block
	 */
	if (sl)
		w1_unref_slave(sl);
	else
		atomic_dec(&dev->refcnt);
	dev->portid = 0;
	mutex_unlock(&dev->bus_mutex);

	mutex_lock(&dev->list_mutex);
	list_del(&async_cmd->async_entry);
	mutex_unlock(&dev->list_mutex);

	if (atomic_sub_return(1, &node->block->refcnt) == 0)
		kfree(node->block);
}

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_slave *sl;
	struct w1_master *dev;
	u16 msg_len;
	int err = 0;
	struct w1_cb_block *block = NULL;
	struct w1_cb_node *node = NULL;
	int node_count = 0;

	/* Count the number of master or slave commands there are to allocate
	 * space for one cb_node each.
	 */
	msg_len = msg->len;
	while (msg_len && !err) {
		if (m->len + sizeof(struct w1_netlink_msg) > msg_len) {
			err = -E2BIG;
			break;
		}

		if (m->type == W1_MASTER_CMD || m->type == W1_SLAVE_CMD)
			++node_count;

		msg_len -= sizeof(struct w1_netlink_msg) + m->len;
		m = (struct w1_netlink_msg *)(((u8 *)m) +
			sizeof(struct w1_netlink_msg) + m->len);
	}
	m = (struct w1_netlink_msg *)(msg + 1);
	if (node_count) {
		/* msg->len doesn't include itself */
		long size = sizeof(struct w1_cb_block) + msg->len +
			node_count*sizeof(struct w1_cb_node);
		block = kmalloc(size, GFP_KERNEL);
		if (!block) {
			w1_netlink_send_error(msg, m, NULL, nsp->portid,
				-ENOMEM);
			return;
		}
		atomic_set(&block->refcnt, 1);
		block->portid = nsp->portid;
		memcpy(&block->msg, msg, sizeof(*msg) + msg->len);
		node = (struct w1_cb_node *)((u8 *)block->msg.data + msg->len);
	}

	msg_len = msg->len;
	while (msg_len && !err) {

		dev = NULL;
		sl = NULL;

		if (m->len + sizeof(struct w1_netlink_msg) > msg_len) {
			err = -E2BIG;
			break;
		}

		/* execute on this thread, no need to process later */
		if (m->type == W1_LIST_MASTERS) {
			err = w1_process_command_root(msg, m, nsp->portid);
			goto out_cont;
		}

		/* All following message types require additional data,
		 * check here before references are taken.
		 */
		if (!m->len) {
			err = -EPROTO;
			goto out_cont;
		}

		/* both search calls take reference counts */
		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((struct w1_reg_num *)m->id.id);
			if (sl)
				dev = sl->master;
		} else {
			printk(KERN_NOTICE
				"%s: msg: %x.%x, wrong type: %u, len: %u.\n",
				__func__, msg->id.idx, msg->id.val,
				m->type, m->len);
			err = -EPROTO;
			goto out_cont;
		}

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

		err = 0;

		atomic_inc(&block->refcnt);
		node->async.cb = w1_process_cb;
		node->block = block;
		node->m = (struct w1_netlink_msg *)((u8 *)&block->msg +
			(size_t)((u8 *)m - (u8 *)msg));
		node->sl = sl;
		node->dev = dev;

		mutex_lock(&dev->list_mutex);
		list_add_tail(&node->async.async_entry, &dev->async_list);
		wake_up_process(dev->thread);
		mutex_unlock(&dev->list_mutex);
		++node;

out_cont:
		if (err)
			w1_netlink_send_error(msg, m, NULL, nsp->portid, 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;
	}
	if (block && atomic_sub_return(1, &block->refcnt) == 0)
		kfree(block);
}

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
5dbf5671	48	cn_netlink_send(m, dev->portid, 0, GFP_KERNEL);
12003375	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;
6b355b33	57	u64 *data;
3b838407 EP	58
	59	avail = dev->priv_size - cmd->len;
	60
6b355b33 DF	61	if (avail < 8) {
6b355b33 DF	62	msg->ack++;
5dbf5671	63	cn_netlink_send(msg, dev->portid, 0, GFP_KERNEL);
3b838407	64
6b355b33 DF	65	msg->len = sizeof(struct w1_netlink_msg) +
	66	sizeof(struct w1_netlink_cmd);
	67	hdr->len = sizeof(struct w1_netlink_cmd);
	68	cmd->len = 0;
3b838407 EP	69	}
3b838407 EP	70
6b355b33	71	data = (void *)(cmd + 1) + cmd->len;
3b838407	72
6b355b33 DF	73	*data = rn;
	74	cmd->len += 8;
	75	hdr->len += 8;
	76	msg->len += 8;
3b838407 EP	77	}
3b838407 EP	78
70b34d2e	79	static void w1_found_send_slave(struct w1_master *dev, u64 rn)
12003375	80	{
70b34d2e DF	81	/* update kernel slave list */
70b34d2e DF	82	w1_slave_found(dev, rn);
1da177e4	83
70b34d2e DF	84	w1_send_slave(dev, rn);
	85	}
	86
	87	/* Get the current slave list, or search (with or without alarm) */
	88	static int w1_get_slaves(struct w1_master *dev,
	89	struct cn_msg req_msg, struct w1_netlink_msg req_hdr,
	90	struct w1_netlink_cmd *req_cmd)
	91	{
	92	struct cn_msg *msg;
	93	struct w1_netlink_msg *hdr;
	94	struct w1_netlink_cmd *cmd;
	95	struct w1_slave *sl;
	96
	97	msg = kzalloc(PAGE_SIZE, GFP_KERNEL);
	98	if (!msg)
	99	return -ENOMEM;
	100
	101	msg->id = req_msg->id;
	102	msg->seq = req_msg->seq;
	103	msg->ack = 0;
	104	msg->len = sizeof(struct w1_netlink_msg) +
	105	sizeof(struct w1_netlink_cmd);
3b838407	106
70b34d2e DF	107	hdr = (struct w1_netlink_msg *)(msg + 1);
	108	cmd = (struct w1_netlink_cmd *)(hdr + 1);
	109
	110	hdr->type = W1_MASTER_CMD;
	111	hdr->id = req_hdr->id;
	112	hdr->len = sizeof(struct w1_netlink_cmd);
	113
	114	cmd->cmd = req_cmd->cmd;
	115	cmd->len = 0;
	116
	117	dev->priv = msg;
	118	dev->priv_size = PAGE_SIZE - msg->len - sizeof(struct cn_msg);
	119
	120	if (req_cmd->cmd == W1_CMD_LIST_SLAVES) {
	121	__u64 rn;
9fcbbac5	122	mutex_lock(&dev->list_mutex);
70b34d2e DF	123	list_for_each_entry(sl, &dev->slist, w1_slave_entry) {
	124	memcpy(&rn, &sl->reg_num, sizeof(rn));
	125	w1_send_slave(dev, rn);
	126	}
9fcbbac5	127	mutex_unlock(&dev->list_mutex);
70b34d2e DF	128	} else {
	129	w1_search_process_cb(dev, cmd->cmd == W1_CMD_ALARM_SEARCH ?
	130	W1_ALARM_SEARCH : W1_SEARCH, w1_found_send_slave);
	131	}
3b838407 EP	132
3b838407 EP	133	msg->ack = 0;
5dbf5671	134	cn_netlink_send(msg, dev->portid, 0, GFP_KERNEL);
3b838407 EP	135
	136	dev->priv = NULL;
	137	dev->priv_size = 0;
1da177e4	138
70b34d2e DF	139	kfree(msg);
70b34d2e DF	140
12003375	141	return 0;
1da177e4	142	}
2d833179	143
c7e26631	144	static int w1_send_read_reply(struct cn_msg msg, struct w1_netlink_msg hdr,
5dbf5671	145	struct w1_netlink_cmd *cmd, u32 portid)
2d833179	146	{
12003375 EP	147	void *data;
	148	struct w1_netlink_msg *h;
	149	struct w1_netlink_cmd *c;
	150	struct cn_msg *cm;
	151	int err;
	152
	153	data = kzalloc(sizeof(struct cn_msg) +
	154	sizeof(struct w1_netlink_msg) +
	155	sizeof(struct w1_netlink_cmd) +
	156	cmd->len, GFP_KERNEL);
	157	if (!data)
	158	return -ENOMEM;
	159
	160	cm = (struct cn_msg *)(data);
	161	h = (struct w1_netlink_msg *)(cm + 1);
	162	c = (struct w1_netlink_cmd *)(h + 1);
	163
	164	memcpy(cm, msg, sizeof(struct cn_msg));
	165	memcpy(h, hdr, sizeof(struct w1_netlink_msg));
	166	memcpy(c, cmd, sizeof(struct w1_netlink_cmd));
	167
	168	cm->ack = msg->seq+1;
c7e26631 EP	169	cm->len = sizeof(struct w1_netlink_msg) +
c7e26631 EP	170	sizeof(struct w1_netlink_cmd) + cmd->len;
12003375 EP	171
	172	h->len = sizeof(struct w1_netlink_cmd) + cmd->len;
	173
	174	memcpy(c->data, cmd->data, c->len);
	175
5dbf5671	176	err = cn_netlink_send(cm, portid, 0, GFP_KERNEL);
12003375 EP	177
	178	kfree(data);
	179
	180	return err;
	181	}
	182
c7e26631	183	static int w1_process_command_io(struct w1_master dev, struct cn_msg msg,
12003375 EP	184	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	185	{
	186	int err = 0;
	187
c7e26631 EP	188	switch (cmd->cmd) {
	189	case W1_CMD_TOUCH:
	190	w1_touch_block(dev, cmd->data, cmd->len);
5dbf5671	191	w1_send_read_reply(msg, hdr, cmd, dev->portid);
c7e26631 EP	192	break;
	193	case W1_CMD_READ:
	194	w1_read_block(dev, cmd->data, cmd->len);
5dbf5671	195	w1_send_read_reply(msg, hdr, cmd, dev->portid);
c7e26631 EP	196	break;
	197	case W1_CMD_WRITE:
	198	w1_write_block(dev, cmd->data, cmd->len);
	199	break;
	200	default:
4037014e	201	err = -EINVAL;
c7e26631 EP	202	break;
	203	}
	204
	205	return err;
	206	}
	207
70b34d2e DF	208	static int w1_process_command_addremove(struct w1_master *dev,
	209	struct cn_msg msg, struct w1_netlink_msg hdr,
	210	struct w1_netlink_cmd *cmd)
c7e26631	211	{
70b34d2e DF	212	struct w1_slave *sl;
	213	int err = 0;
	214	struct w1_reg_num *id;
c7e26631	215
70b34d2e DF	216	if (cmd->len != 8)
70b34d2e DF	217	return -EINVAL;
c7e26631	218
70b34d2e	219	id = (struct w1_reg_num *)cmd->data;
c7e26631	220
70b34d2e DF	221	sl = w1_slave_search_device(dev, id);
	222	switch (cmd->cmd) {
	223	case W1_CMD_SLAVE_ADD:
	224	if (sl)
	225	err = -EINVAL;
	226	else
	227	err = w1_attach_slave_device(dev, id);
	228	break;
	229	case W1_CMD_SLAVE_REMOVE:
	230	if (sl)
	231	w1_slave_detach(sl);
	232	else
	233	err = -EINVAL;
	234	break;
	235	default:
	236	err = -EINVAL;
	237	break;
	238	}
c7e26631	239
70b34d2e DF	240	return err;
70b34d2e DF	241	}
c7e26631	242
70b34d2e DF	243	static int w1_process_command_master(struct w1_master *dev,
	244	struct cn_msg req_msg, struct w1_netlink_msg req_hdr,
	245	struct w1_netlink_cmd *req_cmd)
	246	{
	247	int err = -EINVAL;
12003375	248
d3a8a9db DF	249	/* drop bus_mutex for search (does it's own locking), and add/remove
	250	* which doesn't use the bus
	251	*/
70b34d2e	252	switch (req_cmd->cmd) {
c7e26631 EP	253	case W1_CMD_SEARCH:
c7e26631 EP	254	case W1_CMD_ALARM_SEARCH:
70b34d2e	255	case W1_CMD_LIST_SLAVES:
d3a8a9db	256	mutex_unlock(&dev->bus_mutex);
70b34d2e	257	err = w1_get_slaves(dev, req_msg, req_hdr, req_cmd);
d3a8a9db	258	mutex_lock(&dev->bus_mutex);
c7e26631 EP	259	break;
	260	case W1_CMD_READ:
	261	case W1_CMD_WRITE:
	262	case W1_CMD_TOUCH:
4037014e	263	err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd);
c7e26631	264	break;
f89735c4 EP	265	case W1_CMD_RESET:
	266	err = w1_reset_bus(dev);
	267	break;
70b34d2e DF	268	case W1_CMD_SLAVE_ADD:
70b34d2e DF	269	case W1_CMD_SLAVE_REMOVE:
d3a8a9db DF	270	mutex_unlock(&dev->bus_mutex);
d3a8a9db DF	271	mutex_lock(&dev->mutex);
70b34d2e DF	272	err = w1_process_command_addremove(dev, req_msg, req_hdr,
70b34d2e DF	273	req_cmd);
d3a8a9db DF	274	mutex_unlock(&dev->mutex);
d3a8a9db DF	275	mutex_lock(&dev->bus_mutex);
70b34d2e	276	break;
c7e26631	277	default:
4037014e	278	err = -EINVAL;
c7e26631	279	break;
2d833179 EP	280	}
2d833179 EP	281
12003375 EP	282	return err;
	283	}
	284
c7e26631 EP	285	static int w1_process_command_slave(struct w1_slave sl, struct cn_msg msg,
	286	struct w1_netlink_msg hdr, struct w1_netlink_cmd cmd)
	287	{
	288	dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",
	289	__func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id,
	290	sl->reg_num.crc, cmd->cmd, cmd->len);
	291
	292	return w1_process_command_io(sl->master, msg, hdr, cmd);
	293	}
	294
5dbf5671 DF	295	static int w1_process_command_root(struct cn_msg *msg,
5dbf5671 DF	296	struct w1_netlink_msg *mcmd, u32 portid)
610705e7 EP	297	{
	298	struct w1_master *m;
	299	struct cn_msg *cn;
	300	struct w1_netlink_msg *w;
	301	u32 *id;
	302
610705e7 EP	303	cn = kmalloc(PAGE_SIZE, GFP_KERNEL);
	304	if (!cn)
	305	return -ENOMEM;
	306
	307	cn->id.idx = CN_W1_IDX;
	308	cn->id.val = CN_W1_VAL;
	309
	310	cn->seq = msg->seq;
	311	cn->ack = 1;
	312	cn->len = sizeof(struct w1_netlink_msg);
	313	w = (struct w1_netlink_msg *)(cn + 1);
	314
	315	w->type = W1_LIST_MASTERS;
4037014e	316	w->status = 0;
610705e7 EP	317	w->len = 0;
	318	id = (u32 *)(w + 1);
	319
	320	mutex_lock(&w1_mlock);
	321	list_for_each_entry(m, &w1_masters, w1_master_entry) {
	322	if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
5dbf5671	323	cn_netlink_send(cn, portid, 0, GFP_KERNEL);
610705e7 EP	324	cn->ack++;
	325	cn->len = sizeof(struct w1_netlink_msg);
	326	w->len = 0;
	327	id = (u32 *)(w + 1);
	328	}
	329
	330	*id = m->id;
	331	w->len += sizeof(*id);
	332	cn->len += sizeof(*id);
	333	id++;
	334	}
	335	cn->ack = 0;
5dbf5671	336	cn_netlink_send(cn, portid, 0, GFP_KERNEL);
610705e7 EP	337	mutex_unlock(&w1_mlock);
	338
	339	kfree(cn);
	340	return 0;
	341	}
	342
4037014e	343	static int w1_netlink_send_error(struct cn_msg rcmsg, struct w1_netlink_msg rmsg,
5dbf5671	344	struct w1_netlink_cmd *rcmd, int portid, int error)
4037014e EP	345	{
	346	struct cn_msg *cmsg;
	347	struct w1_netlink_msg *msg;
	348	struct w1_netlink_cmd *cmd;
	349
	350	cmsg = kzalloc(sizeof(msg) + sizeof(cmd) + sizeof(*cmsg), GFP_KERNEL);
	351	if (!cmsg)
	352	return -ENOMEM;
	353
	354	msg = (struct w1_netlink_msg *)(cmsg + 1);
	355	cmd = (struct w1_netlink_cmd *)(msg + 1);
	356
	357	memcpy(cmsg, rcmsg, sizeof(*cmsg));
	358	cmsg->len = sizeof(*msg);
	359
	360	memcpy(msg, rmsg, sizeof(*msg));
	361	msg->len = 0;
	362	msg->status = (short)-error;
	363
	364	if (rcmd) {
	365	memcpy(cmd, rcmd, sizeof(*cmd));
	366	cmd->len = 0;
	367	msg->len += sizeof(*cmd);
	368	cmsg->len += sizeof(*cmd);
	369	}
	370
5dbf5671	371	error = cn_netlink_send(cmsg, portid, 0, GFP_KERNEL);
4037014e EP	372	kfree(cmsg);
	373
	374	return error;
	375	}
	376
9fcbbac5 DF	377	/* Bundle together a reference count, the full message, and broken out
	378	* commands to be executed on each w1 master kthread in one memory allocation.
	379	*/
	380	struct w1_cb_block {
	381	atomic_t refcnt;
5dbf5671	382	u32 portid; /* Sending process port ID */
9fcbbac5 DF	383	struct cn_msg msg;
	384	/* cn_msg data */
	385	/* one or more variable length struct w1_cb_node */
	386	};
	387	struct w1_cb_node {
	388	struct w1_async_cmd async;
	389	/* pointers within w1_cb_block and msg data */
	390	struct w1_cb_block *block;
	391	struct w1_netlink_msg *m;
	392	struct w1_slave *sl;
	393	struct w1_master *dev;
	394	};
	395
	396	static void w1_process_cb(struct w1_master dev, struct w1_async_cmd async_cmd)
	397	{
	398	struct w1_cb_node *node = container_of(async_cmd, struct w1_cb_node,
	399	async);
	400	u16 mlen = node->m->len;
	401	u8 *cmd_data = node->m->data;
	402	int err = 0;
	403	struct w1_slave *sl = node->sl;
	404	struct w1_netlink_cmd *cmd = NULL;
	405
d3a8a9db	406	mutex_lock(&dev->bus_mutex);
5dbf5671	407	dev->portid = node->block->portid;
9fcbbac5 DF	408	if (sl && w1_reset_select_slave(sl))
	409	err = -ENODEV;
	410
	411	while (mlen && !err) {
	412	cmd = (struct w1_netlink_cmd *)cmd_data;
	413
	414	if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {
	415	err = -E2BIG;
	416	break;
	417	}
	418
	419	if (sl)
	420	err = w1_process_command_slave(sl, &node->block->msg,
	421	node->m, cmd);
	422	else
	423	err = w1_process_command_master(dev, &node->block->msg,
	424	node->m, cmd);
	425
5dbf5671 DF	426	w1_netlink_send_error(&node->block->msg, node->m, cmd,
5dbf5671 DF	427	node->block->portid, err);
9fcbbac5 DF	428	err = 0;
	429
	430	cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
	431	mlen -= cmd->len + sizeof(struct w1_netlink_cmd);
	432	}
	433
	434	if (!cmd \|\| err)
5dbf5671 DF	435	w1_netlink_send_error(&node->block->msg, node->m, cmd,
5dbf5671 DF	436	node->block->portid, err);
9fcbbac5	437
593ceb0c DF	438	/* ref taken in w1_search_slave or w1_search_master_id when building
	439	* the block
	440	*/
9fcbbac5 DF	441	if (sl)
	442	w1_unref_slave(sl);
	443	else
	444	atomic_dec(&dev->refcnt);
5dbf5671	445	dev->portid = 0;
d3a8a9db	446	mutex_unlock(&dev->bus_mutex);
9fcbbac5 DF	447
	448	mutex_lock(&dev->list_mutex);
	449	list_del(&async_cmd->async_entry);
	450	mutex_unlock(&dev->list_mutex);
	451
	452	if (atomic_sub_return(1, &node->block->refcnt) == 0)
	453	kfree(node->block);
	454	}
	455
7069331d	456	static void w1_cn_callback(struct cn_msg msg, struct netlink_skb_parms nsp)
12003375	457	{
12003375	458	struct w1_netlink_msg m = (struct w1_netlink_msg )(msg + 1);
12003375 EP	459	struct w1_slave *sl;
12003375 EP	460	struct w1_master *dev;
9fcbbac5	461	u16 msg_len;
12003375	462	int err = 0;
9fcbbac5 DF	463	struct w1_cb_block *block = NULL;
	464	struct w1_cb_node *node = NULL;
	465	int node_count = 0;
	466
	467	/* Count the number of master or slave commands there are to allocate
	468	* space for one cb_node each.
	469	*/
	470	msg_len = msg->len;
	471	while (msg_len && !err) {
	472	if (m->len + sizeof(struct w1_netlink_msg) > msg_len) {
	473	err = -E2BIG;
	474	break;
	475	}
	476
	477	if (m->type == W1_MASTER_CMD \|\| m->type == W1_SLAVE_CMD)
	478	++node_count;
	479
	480	msg_len -= sizeof(struct w1_netlink_msg) + m->len;
	481	m = (struct w1_netlink_msg )(((u8 )m) +
	482	sizeof(struct w1_netlink_msg) + m->len);
	483	}
	484	m = (struct w1_netlink_msg *)(msg + 1);
	485	if (node_count) {
	486	/* msg->len doesn't include itself */
	487	long size = sizeof(struct w1_cb_block) + msg->len +
	488	node_count*sizeof(struct w1_cb_node);
	489	block = kmalloc(size, GFP_KERNEL);
	490	if (!block) {
5dbf5671 DF	491	w1_netlink_send_error(msg, m, NULL, nsp->portid,
5dbf5671 DF	492	-ENOMEM);
9fcbbac5 DF	493	return;
	494	}
	495	atomic_set(&block->refcnt, 1);
5dbf5671	496	block->portid = nsp->portid;
9fcbbac5 DF	497	memcpy(&block->msg, msg, sizeof(*msg) + msg->len);
	498	node = (struct w1_cb_node )((u8 )block->msg.data + msg->len);
	499	}
12003375	500
9fcbbac5 DF	501	msg_len = msg->len;
9fcbbac5 DF	502	while (msg_len && !err) {
12003375 EP	503
	504	dev = NULL;
	505	sl = NULL;
	506
9fcbbac5	507	if (m->len + sizeof(struct w1_netlink_msg) > msg_len) {
12003375 EP	508	err = -E2BIG;
	509	break;
	510	}
	511
593ceb0c DF	512	/* execute on this thread, no need to process later */
	513	if (m->type == W1_LIST_MASTERS) {
	514	err = w1_process_command_root(msg, m, nsp->portid);
	515	goto out_cont;
	516	}
	517
	518	/* All following message types require additional data,
	519	* check here before references are taken.
	520	*/
	521	if (!m->len) {
	522	err = -EPROTO;
	523	goto out_cont;
	524	}
	525
	526	/* both search calls take reference counts */
12003375 EP	527	if (m->type == W1_MASTER_CMD) {
	528	dev = w1_search_master_id(m->id.mst.id);
	529	} else if (m->type == W1_SLAVE_CMD) {
593ceb0c	530	sl = w1_search_slave((struct w1_reg_num *)m->id.id);
12003375 EP	531	if (sl)
12003375 EP	532	dev = sl->master;
610705e7	533	} else {
593ceb0c DF	534	printk(KERN_NOTICE
	535	"%s: msg: %x.%x, wrong type: %u, len: %u.\n",
	536	__func__, msg->id.idx, msg->id.val,
	537	m->type, m->len);
	538	err = -EPROTO;
610705e7	539	goto out_cont;
12003375 EP	540	}
	541
	542	if (!dev) {
	543	err = -ENODEV;
	544	goto out_cont;
	545	}
	546
9be62e0b	547	err = 0;
9be62e0b	548
9fcbbac5 DF	549	atomic_inc(&block->refcnt);
	550	node->async.cb = w1_process_cb;
	551	node->block = block;
	552	node->m = (struct w1_netlink_msg )((u8 )&block->msg +
	553	(size_t)((u8 )m - (u8 )msg));
	554	node->sl = sl;
	555	node->dev = dev;
12003375	556
9fcbbac5 DF	557	mutex_lock(&dev->list_mutex);
	558	list_add_tail(&node->async.async_entry, &dev->async_list);
	559	wake_up_process(dev->thread);
	560	mutex_unlock(&dev->list_mutex);
	561	++node;
4037014e	562
12003375	563	out_cont:
9fcbbac5	564	if (err)
5dbf5671	565	w1_netlink_send_error(msg, m, NULL, nsp->portid, err);
9fcbbac5	566	msg_len -= sizeof(struct w1_netlink_msg) + m->len;
593ceb0c DF	567	m = (struct w1_netlink_msg )(((u8 )m) +
593ceb0c DF	568	sizeof(struct w1_netlink_msg) + m->len);
12003375 EP	569
	570	/*
	571	* Let's allow requests for nonexisting devices.
	572	*/
	573	if (err == -ENODEV)
	574	err = 0;
	575	}
9fcbbac5 DF	576	if (block && atomic_sub_return(1, &block->refcnt) == 0)
9fcbbac5 DF	577	kfree(block);
2d833179 EP	578	}
2d833179 EP	579
12003375	580	int w1_init_netlink(void)
2d833179	581	{
12003375 EP	582	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	583
	584	return cn_add_callback(&w1_id, "w1", &w1_cn_callback);
	585	}
	586
	587	void w1_fini_netlink(void)
	588	{
	589	struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};
	590
	591	cn_del_callback(&w1_id);
2d833179	592	}
1da177e4	593	#else
1da177e4 LT	594	void w1_netlink_send(struct w1_master dev, struct w1_netlink_msg msg)
	595	{
	596	}
2d833179	597
12003375	598	int w1_init_netlink(void)
2d833179 EP	599	{
	600	return 0;
	601	}
	602
12003375	603	void w1_fini_netlink(void)
2d833179 EP	604	{
2d833179 EP	605	}
1da177e4	606	#endif