[linux-2.6-block.git] / net / tipc / config.c

/*
 * net/tipc/config.c: TIPC configuration management code
 *
 * Copyright (c) 2002-2006, Ericsson AB
 * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "port.h"
#include "name_table.h"
#include "config.h"
#include "server.h"

#define REPLY_TRUNCATED "<truncated>\n"

static DEFINE_MUTEX(config_mutex);
static struct tipc_server cfgsrv;

static const void *req_tlv_area;	/* request message TLV area */
static int req_tlv_space;		/* request message TLV area size */
static int rep_headroom;		/* reply message headroom to use */


struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
{
	struct sk_buff *buf;

	buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
	if (buf)
		skb_reserve(buf, rep_headroom);
	return buf;
}

int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
			void *tlv_data, int tlv_data_size)
{
	struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
	int new_tlv_space = TLV_SPACE(tlv_data_size);

	if (skb_tailroom(buf) < new_tlv_space)
		return 0;
	skb_put(buf, new_tlv_space);
	tlv->tlv_type = htons(tlv_type);
	tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
	if (tlv_data_size && tlv_data)
		memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
	return 1;
}

static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
{
	struct sk_buff *buf;
	__be32 value_net;

	buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
	if (buf) {
		value_net = htonl(value);
		tipc_cfg_append_tlv(buf, tlv_type, &value_net,
				    sizeof(value_net));
	}
	return buf;
}

static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
{
	return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
}

struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
{
	struct sk_buff *buf;
	int string_len = strlen(string) + 1;

	buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
	if (buf)
		tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
	return buf;
}

static struct sk_buff *tipc_show_stats(void)
{
	struct sk_buff *buf;
	struct tlv_desc *rep_tlv;
	char *pb;
	int pb_len;
	int str_len;
	u32 value;

	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);

	value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
	if (value != 0)
		return tipc_cfg_reply_error_string("unsupported argument");

	buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
	if (buf == NULL)
		return NULL;

	rep_tlv = (struct tlv_desc *)buf->data;
	pb = TLV_DATA(rep_tlv);
	pb_len = ULTRA_STRING_MAX_LEN;

	str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
	str_len += 1;	/* for "\0" */
	skb_put(buf, TLV_SPACE(str_len));
	TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);

	return buf;
}

static struct sk_buff *cfg_enable_bearer(void)
{
	struct tipc_bearer_config *args;

	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);

	args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
	if (tipc_enable_bearer(args->name,
			       ntohl(args->disc_domain),
			       ntohl(args->priority)))
		return tipc_cfg_reply_error_string("unable to enable bearer");

	return tipc_cfg_reply_none();
}

static struct sk_buff *cfg_disable_bearer(void)
{
	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);

	if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
		return tipc_cfg_reply_error_string("unable to disable bearer");

	return tipc_cfg_reply_none();
}

static struct sk_buff *cfg_set_own_addr(void)
{
	u32 addr;

	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);

	addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
	if (addr == tipc_own_addr)
		return tipc_cfg_reply_none();
	if (!tipc_addr_node_valid(addr))
		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
						   " (node address)");
	if (tipc_own_addr)
		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
						   " (cannot change node address once assigned)");
	tipc_core_start_net(addr);
	return tipc_cfg_reply_none();
}

static struct sk_buff *cfg_set_remote_mng(void)
{
	u32 value;

	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);

	value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
	tipc_remote_management = (value != 0);
	return tipc_cfg_reply_none();
}

static struct sk_buff *cfg_set_max_ports(void)
{
	u32 value;

	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
	value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
	if (value == tipc_max_ports)
		return tipc_cfg_reply_none();
	if (value < 127 || value > 65535)
		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
						   " (max ports must be 127-65535)");
	return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
		" (cannot change max ports while TIPC is active)");
}

static struct sk_buff *cfg_set_netid(void)
{
	u32 value;

	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
		return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
	value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
	if (value == tipc_net_id)
		return tipc_cfg_reply_none();
	if (value < 1 || value > 9999)
		return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
						   " (network id must be 1-9999)");
	if (tipc_own_addr)
		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
			" (cannot change network id once TIPC has joined a network)");
	tipc_net_id = value;
	return tipc_cfg_reply_none();
}

struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
				int request_space, int reply_headroom)
{
	struct sk_buff *rep_tlv_buf;

	mutex_lock(&config_mutex);

	/* Save request and reply details in a well-known location */
	req_tlv_area = request_area;
	req_tlv_space = request_space;
	rep_headroom = reply_headroom;

	/* Check command authorization */
	if (likely(in_own_node(orig_node))) {
		/* command is permitted */
	} else if (cmd >= 0x8000) {
		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
							  " (cannot be done remotely)");
		goto exit;
	} else if (!tipc_remote_management) {
		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
		goto exit;
	} else if (cmd >= 0x4000) {
		u32 domain = 0;

		if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
		    (domain != orig_node)) {
			rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
			goto exit;
		}
	}

	/* Call appropriate processing routine */
	switch (cmd) {
	case TIPC_CMD_NOOP:
		rep_tlv_buf = tipc_cfg_reply_none();
		break;
	case TIPC_CMD_GET_NODES:
		rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
		break;
	case TIPC_CMD_GET_LINKS:
		rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
		break;
	case TIPC_CMD_SHOW_LINK_STATS:
		rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
		break;
	case TIPC_CMD_RESET_LINK_STATS:
		rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
		break;
	case TIPC_CMD_SHOW_NAME_TABLE:
		rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
		break;
	case TIPC_CMD_GET_BEARER_NAMES:
		rep_tlv_buf = tipc_bearer_get_names();
		break;
	case TIPC_CMD_GET_MEDIA_NAMES:
		rep_tlv_buf = tipc_media_get_names();
		break;
	case TIPC_CMD_SHOW_PORTS:
		rep_tlv_buf = tipc_port_get_ports();
		break;
	case TIPC_CMD_SHOW_STATS:
		rep_tlv_buf = tipc_show_stats();
		break;
	case TIPC_CMD_SET_LINK_TOL:
	case TIPC_CMD_SET_LINK_PRI:
	case TIPC_CMD_SET_LINK_WINDOW:
		rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
		break;
	case TIPC_CMD_ENABLE_BEARER:
		rep_tlv_buf = cfg_enable_bearer();
		break;
	case TIPC_CMD_DISABLE_BEARER:
		rep_tlv_buf = cfg_disable_bearer();
		break;
	case TIPC_CMD_SET_NODE_ADDR:
		rep_tlv_buf = cfg_set_own_addr();
		break;
	case TIPC_CMD_SET_REMOTE_MNG:
		rep_tlv_buf = cfg_set_remote_mng();
		break;
	case TIPC_CMD_SET_MAX_PORTS:
		rep_tlv_buf = cfg_set_max_ports();
		break;
	case TIPC_CMD_SET_NETID:
		rep_tlv_buf = cfg_set_netid();
		break;
	case TIPC_CMD_GET_REMOTE_MNG:
		rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
		break;
	case TIPC_CMD_GET_MAX_PORTS:
		rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
		break;
	case TIPC_CMD_GET_NETID:
		rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
		break;
	case TIPC_CMD_NOT_NET_ADMIN:
		rep_tlv_buf =
			tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
		break;
	case TIPC_CMD_SET_MAX_ZONES:
	case TIPC_CMD_GET_MAX_ZONES:
	case TIPC_CMD_SET_MAX_SLAVES:
	case TIPC_CMD_GET_MAX_SLAVES:
	case TIPC_CMD_SET_MAX_CLUSTERS:
	case TIPC_CMD_GET_MAX_CLUSTERS:
	case TIPC_CMD_SET_MAX_NODES:
	case TIPC_CMD_GET_MAX_NODES:
	case TIPC_CMD_SET_MAX_SUBSCR:
	case TIPC_CMD_GET_MAX_SUBSCR:
	case TIPC_CMD_SET_MAX_PUBL:
	case TIPC_CMD_GET_MAX_PUBL:
	case TIPC_CMD_SET_LOG_SIZE:
	case TIPC_CMD_DUMP_LOG:
		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
							  " (obsolete command)");
		break;
	default:
		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
							  " (unknown command)");
		break;
	}

	WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));

	/* Append an error message if we cannot return all requested data */
	if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
		if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
			sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
				sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
	}

	/* Return reply buffer */
exit:
	mutex_unlock(&config_mutex);
	return rep_tlv_buf;
}

static void cfg_conn_msg_event(int conid, struct sockaddr_tipc *addr,
			       void *usr_data, void *buf, size_t len)
{
	struct tipc_cfg_msg_hdr *req_hdr;
	struct tipc_cfg_msg_hdr *rep_hdr;
	struct sk_buff *rep_buf;
	int ret;

	/* Validate configuration message header (ignore invalid message) */
	req_hdr = (struct tipc_cfg_msg_hdr *)buf;
	if ((len < sizeof(*req_hdr)) ||
	    (len != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
	    (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
		pr_warn("Invalid configuration message discarded\n");
		return;
	}

	/* Generate reply for request (if can't, return request) */
	rep_buf = tipc_cfg_do_cmd(addr->addr.id.node, ntohs(req_hdr->tcm_type),
				  buf + sizeof(*req_hdr),
				  len - sizeof(*req_hdr),
				  BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
	if (rep_buf) {
		skb_push(rep_buf, sizeof(*rep_hdr));
		rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
		memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
		rep_hdr->tcm_len = htonl(rep_buf->len);
		rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);

		ret = tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
					rep_buf->len);
		if (ret < 0)
			pr_err("Sending cfg reply message failed, no memory\n");

		kfree_skb(rep_buf);
	}
}

static struct sockaddr_tipc cfgsrv_addr __read_mostly = {
	.family			= AF_TIPC,
	.addrtype		= TIPC_ADDR_NAMESEQ,
	.addr.nameseq.type	= TIPC_CFG_SRV,
	.addr.nameseq.lower	= 0,
	.addr.nameseq.upper	= 0,
	.scope			= TIPC_ZONE_SCOPE
};

static struct tipc_server cfgsrv __read_mostly = {
	.saddr			= &cfgsrv_addr,
	.imp			= TIPC_CRITICAL_IMPORTANCE,
	.type			= SOCK_RDM,
	.max_rcvbuf_size	= 64 * 1024,
	.name			= "cfg_server",
	.tipc_conn_recvmsg	= cfg_conn_msg_event,
	.tipc_conn_new		= NULL,
	.tipc_conn_shutdown	= NULL
};

int tipc_cfg_init(void)
{
	return tipc_server_start(&cfgsrv);
}

void tipc_cfg_reinit(void)
{
	tipc_server_stop(&cfgsrv);

	cfgsrv_addr.addr.nameseq.lower = tipc_own_addr;
	cfgsrv_addr.addr.nameseq.upper = tipc_own_addr;
	tipc_server_start(&cfgsrv);
}

void tipc_cfg_stop(void)
{
	tipc_server_stop(&cfgsrv);
}
Commit	Line	Data
b97bf3fd PL	1	/*
b97bf3fd PL	2	* net/tipc/config.c: TIPC configuration management code
c4307285	3	*
593a5f22	4	* Copyright (c) 2002-2006, Ericsson AB
7d0ab17b	5	* Copyright (c) 2004-2007, 2010-2013, Wind River Systems
b97bf3fd PL	6	* All rights reserved.
b97bf3fd PL	7	*
9ea1fd3c	8	* Redistribution and use in source and binary forms, with or without
b97bf3fd PL	9	* modification, are permitted provided that the following conditions are met:
b97bf3fd PL	10	*
9ea1fd3c PL	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the names of the copyright holders nor the names of its
	17	* contributors may be used to endorse or promote products derived from
	18	* this software without specific prior written permission.
b97bf3fd	19	*
9ea1fd3c PL	20	* Alternatively, this software may be distributed under the terms of the
	21	* GNU General Public License ("GPL") version 2 as published by the Free
	22	* Software Foundation.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	28	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	29	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	30	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	31	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	32	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	33	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
b97bf3fd PL	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#include "core.h"
b97bf3fd	38	#include "port.h"
b97bf3fd	39	#include "name_table.h"
b97bf3fd	40	#include "config.h"
7d0ab17b	41	#include "server.h"
b97bf3fd	42
dc1aed37 EH	43	#define REPLY_TRUNCATED "<truncated>\n"
dc1aed37 EH	44
28e52972	45	static DEFINE_MUTEX(config_mutex);
7d0ab17b	46	static struct tipc_server cfgsrv;
b97bf3fd PL	47
	48	static const void req_tlv_area; / request message TLV area */
	49	static int req_tlv_space; /* request message TLV area size */
	50	static int rep_headroom; /* reply message headroom to use */
	51
	52
4323add6	53	struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
b97bf3fd PL	54	{
	55	struct sk_buff *buf;
	56
	57	buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
	58	if (buf)
	59	skb_reserve(buf, rep_headroom);
	60	return buf;
	61	}
	62
c4307285	63	int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
4323add6	64	void *tlv_data, int tlv_data_size)
b97bf3fd	65	{
27a884dc	66	struct tlv_desc tlv = (struct tlv_desc )skb_tail_pointer(buf);
b97bf3fd PL	67	int new_tlv_space = TLV_SPACE(tlv_data_size);
b97bf3fd PL	68
b29f1428	69	if (skb_tailroom(buf) < new_tlv_space)
b97bf3fd	70	return 0;
b97bf3fd PL	71	skb_put(buf, new_tlv_space);
	72	tlv->tlv_type = htons(tlv_type);
	73	tlv->tlv_len = htons(TLV_LENGTH(tlv_data_size));
	74	if (tlv_data_size && tlv_data)
	75	memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
	76	return 1;
	77	}
	78
31e3c3f6	79	static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
b97bf3fd PL	80	{
b97bf3fd PL	81	struct sk_buff *buf;
3e6c8cd5	82	__be32 value_net;
b97bf3fd	83
4323add6	84	buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
b97bf3fd PL	85	if (buf) {
b97bf3fd PL	86	value_net = htonl(value);
c4307285	87	tipc_cfg_append_tlv(buf, tlv_type, &value_net,
4323add6	88	sizeof(value_net));
b97bf3fd PL	89	}
	90	return buf;
	91	}
	92
31e3c3f6	93	static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
	94	{
	95	return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
	96	}
	97
4323add6	98	struct sk_buff tipc_cfg_reply_string_type(u16 tlv_type, char string)
b97bf3fd PL	99	{
	100	struct sk_buff *buf;
	101	int string_len = strlen(string) + 1;
	102
4323add6	103	buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
b97bf3fd	104	if (buf)
4323add6	105	tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
b97bf3fd PL	106	return buf;
	107	}
	108
107e7be6 AS	109	static struct sk_buff *tipc_show_stats(void)
	110	{
	111	struct sk_buff *buf;
	112	struct tlv_desc *rep_tlv;
dc1aed37 EH	113	char *pb;
dc1aed37 EH	114	int pb_len;
107e7be6 AS	115	int str_len;
	116	u32 value;
	117
	118	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
	119	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
	120
	121	value = ntohl((u32 )TLV_DATA(req_tlv_area));
	122	if (value != 0)
	123	return tipc_cfg_reply_error_string("unsupported argument");
	124
dc1aed37	125	buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
107e7be6 AS	126	if (buf == NULL)
	127	return NULL;
	128
	129	rep_tlv = (struct tlv_desc *)buf->data;
dc1aed37 EH	130	pb = TLV_DATA(rep_tlv);
dc1aed37 EH	131	pb_len = ULTRA_STRING_MAX_LEN;
107e7be6	132
dc1aed37 EH	133	str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
dc1aed37 EH	134	str_len += 1; /* for "\0" */
107e7be6 AS	135	skb_put(buf, TLV_SPACE(str_len));
	136	TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
	137
	138	return buf;
	139	}
	140
b97bf3fd PL	141	static struct sk_buff *cfg_enable_bearer(void)
	142	{
	143	struct tipc_bearer_config *args;
	144
	145	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
4323add6	146	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd PL	147
	148	args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
	149	if (tipc_enable_bearer(args->name,
50d3e639	150	ntohl(args->disc_domain),
b97bf3fd	151	ntohl(args->priority)))
4323add6	152	return tipc_cfg_reply_error_string("unable to enable bearer");
b97bf3fd	153
4323add6	154	return tipc_cfg_reply_none();
b97bf3fd PL	155	}
	156
	157	static struct sk_buff *cfg_disable_bearer(void)
	158	{
	159	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
4323add6	160	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd PL	161
b97bf3fd PL	162	if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
4323add6	163	return tipc_cfg_reply_error_string("unable to disable bearer");
b97bf3fd	164
4323add6	165	return tipc_cfg_reply_none();
b97bf3fd PL	166	}
	167
	168	static struct sk_buff *cfg_set_own_addr(void)
	169	{
	170	u32 addr;
	171
	172	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
4323add6	173	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd	174
3e6c8cd5	175	addr = ntohl((__be32 )TLV_DATA(req_tlv_area));
b97bf3fd	176	if (addr == tipc_own_addr)
4323add6 PL	177	return tipc_cfg_reply_none();
	178	if (!tipc_addr_node_valid(addr))
	179	return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
	180	" (node address)");
b58343f9	181	if (tipc_own_addr)
4323add6 PL	182	return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
4323add6 PL	183	" (cannot change node address once assigned)");
03194379	184	tipc_core_start_net(addr);
4323add6	185	return tipc_cfg_reply_none();
b97bf3fd PL	186	}
	187
	188	static struct sk_buff *cfg_set_remote_mng(void)
	189	{
	190	u32 value;
	191
	192	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
4323add6	193	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd	194
3e6c8cd5	195	value = ntohl((__be32 )TLV_DATA(req_tlv_area));
b97bf3fd	196	tipc_remote_management = (value != 0);
4323add6	197	return tipc_cfg_reply_none();
b97bf3fd PL	198	}
b97bf3fd PL	199
b97bf3fd PL	200	static struct sk_buff *cfg_set_max_ports(void)
b97bf3fd PL	201	{
b97bf3fd PL	202	u32 value;
	203
	204	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
4323add6	205	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
3e6c8cd5	206	value = ntohl((__be32 )TLV_DATA(req_tlv_area));
e100ae92 AS	207	if (value == tipc_max_ports)
e100ae92 AS	208	return tipc_cfg_reply_none();
732efba4	209	if (value < 127 \|\| value > 65535)
4323add6 PL	210	return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
4323add6 PL	211	" (max ports must be 127-65535)");
077a26f0 AS	212	return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
077a26f0 AS	213	" (cannot change max ports while TIPC is active)");
b97bf3fd PL	214	}
b97bf3fd PL	215
b97bf3fd PL	216	static struct sk_buff *cfg_set_netid(void)
	217	{
	218	u32 value;
	219
	220	if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
4323add6	221	return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
3e6c8cd5	222	value = ntohl((__be32 )TLV_DATA(req_tlv_area));
e100ae92 AS	223	if (value == tipc_net_id)
e100ae92 AS	224	return tipc_cfg_reply_none();
732efba4	225	if (value < 1 \|\| value > 9999)
4323add6 PL	226	return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
4323add6 PL	227	" (network id must be 1-9999)");
b58343f9	228	if (tipc_own_addr)
4323add6	229	return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
e100ae92 AS	230	" (cannot change network id once TIPC has joined a network)");
	231	tipc_net_id = value;
	232	return tipc_cfg_reply_none();
b97bf3fd PL	233	}
b97bf3fd PL	234
4323add6 PL	235	struct sk_buff tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void request_area,
4323add6 PL	236	int request_space, int reply_headroom)
b97bf3fd PL	237	{
	238	struct sk_buff *rep_tlv_buf;
	239
28e52972	240	mutex_lock(&config_mutex);
b97bf3fd PL	241
b97bf3fd PL	242	/* Save request and reply details in a well-known location */
b97bf3fd PL	243	req_tlv_area = request_area;
	244	req_tlv_space = request_space;
	245	rep_headroom = reply_headroom;
	246
	247	/* Check command authorization */
9d52ce4b	248	if (likely(in_own_node(orig_node))) {
b97bf3fd PL	249	/* command is permitted */
b97bf3fd PL	250	} else if (cmd >= 0x8000) {
4323add6 PL	251	rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
4323add6 PL	252	" (cannot be done remotely)");
b97bf3fd PL	253	goto exit;
b97bf3fd PL	254	} else if (!tipc_remote_management) {
4323add6	255	rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
b97bf3fd	256	goto exit;
0e65967e	257	} else if (cmd >= 0x4000) {
b97bf3fd PL	258	u32 domain = 0;
b97bf3fd PL	259
4323add6	260	if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) \|\|
b97bf3fd	261	(domain != orig_node)) {
4323add6	262	rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
b97bf3fd PL	263	goto exit;
	264	}
	265	}
	266
	267	/* Call appropriate processing routine */
b97bf3fd PL	268	switch (cmd) {
b97bf3fd PL	269	case TIPC_CMD_NOOP:
4323add6	270	rep_tlv_buf = tipc_cfg_reply_none();
b97bf3fd PL	271	break;
b97bf3fd PL	272	case TIPC_CMD_GET_NODES:
4323add6	273	rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
b97bf3fd PL	274	break;
b97bf3fd PL	275	case TIPC_CMD_GET_LINKS:
4323add6	276	rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
b97bf3fd PL	277	break;
b97bf3fd PL	278	case TIPC_CMD_SHOW_LINK_STATS:
4323add6	279	rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
b97bf3fd PL	280	break;
b97bf3fd PL	281	case TIPC_CMD_RESET_LINK_STATS:
4323add6	282	rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
b97bf3fd PL	283	break;
b97bf3fd PL	284	case TIPC_CMD_SHOW_NAME_TABLE:
4323add6	285	rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
b97bf3fd PL	286	break;
b97bf3fd PL	287	case TIPC_CMD_GET_BEARER_NAMES:
4323add6	288	rep_tlv_buf = tipc_bearer_get_names();
b97bf3fd PL	289	break;
b97bf3fd PL	290	case TIPC_CMD_GET_MEDIA_NAMES:
4323add6	291	rep_tlv_buf = tipc_media_get_names();
b97bf3fd PL	292	break;
b97bf3fd PL	293	case TIPC_CMD_SHOW_PORTS:
4323add6	294	rep_tlv_buf = tipc_port_get_ports();
b97bf3fd	295	break;
107e7be6 AS	296	case TIPC_CMD_SHOW_STATS:
	297	rep_tlv_buf = tipc_show_stats();
	298	break;
b97bf3fd PL	299	case TIPC_CMD_SET_LINK_TOL:
	300	case TIPC_CMD_SET_LINK_PRI:
	301	case TIPC_CMD_SET_LINK_WINDOW:
4323add6	302	rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
b97bf3fd PL	303	break;
	304	case TIPC_CMD_ENABLE_BEARER:
	305	rep_tlv_buf = cfg_enable_bearer();
	306	break;
	307	case TIPC_CMD_DISABLE_BEARER:
	308	rep_tlv_buf = cfg_disable_bearer();
	309	break;
	310	case TIPC_CMD_SET_NODE_ADDR:
	311	rep_tlv_buf = cfg_set_own_addr();
	312	break;
	313	case TIPC_CMD_SET_REMOTE_MNG:
	314	rep_tlv_buf = cfg_set_remote_mng();
	315	break;
	316	case TIPC_CMD_SET_MAX_PORTS:
	317	rep_tlv_buf = cfg_set_max_ports();
	318	break;
b97bf3fd PL	319	case TIPC_CMD_SET_NETID:
	320	rep_tlv_buf = cfg_set_netid();
	321	break;
	322	case TIPC_CMD_GET_REMOTE_MNG:
4323add6	323	rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
b97bf3fd PL	324	break;
b97bf3fd PL	325	case TIPC_CMD_GET_MAX_PORTS:
4323add6	326	rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
b97bf3fd	327	break;
b97bf3fd	328	case TIPC_CMD_GET_NETID:
4323add6	329	rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
b97bf3fd	330	break;
59f0c452 AS	331	case TIPC_CMD_NOT_NET_ADMIN:
	332	rep_tlv_buf =
	333	tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
	334	break;
51f98a8d AS	335	case TIPC_CMD_SET_MAX_ZONES:
51f98a8d AS	336	case TIPC_CMD_GET_MAX_ZONES:
08c80e9a AS	337	case TIPC_CMD_SET_MAX_SLAVES:
08c80e9a AS	338	case TIPC_CMD_GET_MAX_SLAVES:
8f92df6a AS	339	case TIPC_CMD_SET_MAX_CLUSTERS:
8f92df6a AS	340	case TIPC_CMD_GET_MAX_CLUSTERS:
f831c963 AS	341	case TIPC_CMD_SET_MAX_NODES:
f831c963 AS	342	case TIPC_CMD_GET_MAX_NODES:
34f256cc YX	343	case TIPC_CMD_SET_MAX_SUBSCR:
34f256cc YX	344	case TIPC_CMD_GET_MAX_SUBSCR:
e6a04b1d YX	345	case TIPC_CMD_SET_MAX_PUBL:
e6a04b1d YX	346	case TIPC_CMD_GET_MAX_PUBL:
869dd466 EH	347	case TIPC_CMD_SET_LOG_SIZE:
869dd466 EH	348	case TIPC_CMD_DUMP_LOG:
51f98a8d AS	349	rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
	350	" (obsolete command)");
	351	break;
b97bf3fd	352	default:
53cfd1e1 AS	353	rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
53cfd1e1 AS	354	" (unknown command)");
b97bf3fd PL	355	break;
	356	}
	357
dc1aed37 EH	358	WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
	359
	360	/* Append an error message if we cannot return all requested data */
	361	if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
	362	if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
	363	sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
	364	sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
	365	}
	366
b97bf3fd PL	367	/* Return reply buffer */
b97bf3fd PL	368	exit:
28e52972	369	mutex_unlock(&config_mutex);
b97bf3fd PL	370	return rep_tlv_buf;
	371	}
	372
7d0ab17b YX	373	static void cfg_conn_msg_event(int conid, struct sockaddr_tipc *addr,
7d0ab17b YX	374	void usr_data, void buf, size_t len)
b97bf3fd PL	375	{
	376	struct tipc_cfg_msg_hdr *req_hdr;
	377	struct tipc_cfg_msg_hdr *rep_hdr;
	378	struct sk_buff *rep_buf;
7d0ab17b	379	int ret;
b97bf3fd PL	380
b97bf3fd PL	381	/* Validate configuration message header (ignore invalid message) */
7d0ab17b YX	382	req_hdr = (struct tipc_cfg_msg_hdr *)buf;
	383	if ((len < sizeof(*req_hdr)) \|\|
	384	(len != TCM_ALIGN(ntohl(req_hdr->tcm_len))) \|\|
b97bf3fd	385	(ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
2cf8aa19	386	pr_warn("Invalid configuration message discarded\n");
b97bf3fd PL	387	return;
	388	}
	389
	390	/* Generate reply for request (if can't, return request) */
7d0ab17b YX	391	rep_buf = tipc_cfg_do_cmd(addr->addr.id.node, ntohs(req_hdr->tcm_type),
	392	buf + sizeof(*req_hdr),
	393	len - sizeof(*req_hdr),
4323add6	394	BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
b97bf3fd PL	395	if (rep_buf) {
	396	skb_push(rep_buf, sizeof(*rep_hdr));
	397	rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
	398	memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
	399	rep_hdr->tcm_len = htonl(rep_buf->len);
	400	rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
b97bf3fd	401
7d0ab17b YX	402	ret = tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
	403	rep_buf->len);
	404	if (ret < 0)
	405	pr_err("Sending cfg reply message failed, no memory\n");
	406
	407	kfree_skb(rep_buf);
	408	}
b97bf3fd PL	409	}
b97bf3fd PL	410
7d0ab17b YX	411	static struct sockaddr_tipc cfgsrv_addr __read_mostly = {
	412	.family = AF_TIPC,
	413	.addrtype = TIPC_ADDR_NAMESEQ,
	414	.addr.nameseq.type = TIPC_CFG_SRV,
	415	.addr.nameseq.lower = 0,
	416	.addr.nameseq.upper = 0,
	417	.scope = TIPC_ZONE_SCOPE
	418	};
	419
	420	static struct tipc_server cfgsrv __read_mostly = {
	421	.saddr = &cfgsrv_addr,
	422	.imp = TIPC_CRITICAL_IMPORTANCE,
	423	.type = SOCK_RDM,
	424	.max_rcvbuf_size = 64 * 1024,
	425	.name = "cfg_server",
	426	.tipc_conn_recvmsg = cfg_conn_msg_event,
	427	.tipc_conn_new = NULL,
	428	.tipc_conn_shutdown = NULL
	429	};
	430
4323add6	431	int tipc_cfg_init(void)
b97bf3fd	432	{
7d0ab17b	433	return tipc_server_start(&cfgsrv);
b97bf3fd PL	434	}
b97bf3fd PL	435
a2cfd45b AS	436	void tipc_cfg_reinit(void)
a2cfd45b AS	437	{
7d0ab17b	438	tipc_server_stop(&cfgsrv);
a2cfd45b	439
7d0ab17b YX	440	cfgsrv_addr.addr.nameseq.lower = tipc_own_addr;
	441	cfgsrv_addr.addr.nameseq.upper = tipc_own_addr;
	442	tipc_server_start(&cfgsrv);
a2cfd45b AS	443	}
a2cfd45b AS	444
4323add6	445	void tipc_cfg_stop(void)
b97bf3fd	446	{
7d0ab17b	447	tipc_server_stop(&cfgsrv);
b97bf3fd	448	}