net/tipc/config.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 "socket.h"
 #include "name_table.h"
 #include "config.h"
 #include "server.h"

 #define REPLY_TRUNCATED "<truncated>\n"

 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_set_own_addr(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	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 == tn->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 (tn->own_addr)
 		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 						   " (cannot change node address once assigned)");
 	if (!tipc_net_start(net, addr))
 		return tipc_cfg_reply_none();

 	return tipc_cfg_reply_error_string("cannot change to network mode");
 }

 static struct sk_buff *cfg_set_netid(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	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 == tn->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 (tn->own_addr)
 		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 			" (cannot change network id once TIPC has joined a network)");
 	tn->net_id = value;
 	return tipc_cfg_reply_none();
 }

 struct sk_buff *tipc_cfg_do_cmd(struct net *net, u32 orig_node, u16 cmd,
 				const void *request_area, int request_space,
 				int reply_headroom)
 {
 	struct sk_buff *rep_tlv_buf;
 	struct tipc_net *tn = net_generic(net, tipc_net_id);

 	rtnl_lock();

 	/* 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(net, orig_node))) {
 		/* command is permitted */
 	} else {
 		rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 							  " (cannot be done remotely)");
 		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(net, req_tlv_area,
 						  req_tlv_space);
 		break;
 	case TIPC_CMD_RESET_LINK_STATS:
 		rep_tlv_buf = tipc_link_cmd_reset_stats(net, req_tlv_area,
 							req_tlv_space);
 		break;
 	case TIPC_CMD_SHOW_NAME_TABLE:
 		rep_tlv_buf = tipc_nametbl_get(net, req_tlv_area,
 					       req_tlv_space);
 		break;
 	case TIPC_CMD_GET_MEDIA_NAMES:
 		rep_tlv_buf = tipc_media_get_names();
 		break;
 	case TIPC_CMD_SHOW_PORTS:
 		rep_tlv_buf = tipc_sk_socks_show(net);
 		break;
 	case TIPC_CMD_SHOW_STATS:
 		rep_tlv_buf = tipc_show_stats();
 		break;
 	case TIPC_CMD_SET_NODE_ADDR:
 		rep_tlv_buf = cfg_set_own_addr(net);
 		break;
 	case TIPC_CMD_SET_NETID:
 		rep_tlv_buf = cfg_set_netid(net);
 		break;
 	case TIPC_CMD_GET_NETID:
 		rep_tlv_buf = tipc_cfg_reply_unsigned(tn->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_SET_REMOTE_MNG:
 	case TIPC_CMD_GET_REMOTE_MNG:
 	case TIPC_CMD_DUMP_LOG:
 	case TIPC_CMD_SET_MAX_PORTS:
 	case TIPC_CMD_GET_MAX_PORTS:
 		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:
 	rtnl_unlock();
 	return rep_tlv_buf;
 }
	/*
	* 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 "socket.h"
	#include "name_table.h"
	#include "config.h"
	#include "server.h"

	#define REPLY_TRUNCATED "<truncated>\n"

	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_set_own_addr(struct net net)
	{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	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 == tn->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 (tn->own_addr)
	return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
	" (cannot change node address once assigned)");
	if (!tipc_net_start(net, addr))
	return tipc_cfg_reply_none();

	return tipc_cfg_reply_error_string("cannot change to network mode");
	}

	static struct sk_buff cfg_set_netid(struct net net)
	{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	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 == tn->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 (tn->own_addr)
	return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
	" (cannot change network id once TIPC has joined a network)");
	tn->net_id = value;
	return tipc_cfg_reply_none();
	}

	struct sk_buff tipc_cfg_do_cmd(struct net net, u32 orig_node, u16 cmd,
	const void *request_area, int request_space,
	int reply_headroom)
	{
	struct sk_buff *rep_tlv_buf;
	struct tipc_net *tn = net_generic(net, tipc_net_id);

	rtnl_lock();

	/* 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(net, orig_node))) {
	/* command is permitted */
	} else {
	rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
	" (cannot be done remotely)");
	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(net, req_tlv_area,
	req_tlv_space);
	break;
	case TIPC_CMD_RESET_LINK_STATS:
	rep_tlv_buf = tipc_link_cmd_reset_stats(net, req_tlv_area,
	req_tlv_space);
	break;
	case TIPC_CMD_SHOW_NAME_TABLE:
	rep_tlv_buf = tipc_nametbl_get(net, req_tlv_area,
	req_tlv_space);
	break;
	case TIPC_CMD_GET_MEDIA_NAMES:
	rep_tlv_buf = tipc_media_get_names();
	break;
	case TIPC_CMD_SHOW_PORTS:
	rep_tlv_buf = tipc_sk_socks_show(net);
	break;
	case TIPC_CMD_SHOW_STATS:
	rep_tlv_buf = tipc_show_stats();
	break;
	case TIPC_CMD_SET_NODE_ADDR:
	rep_tlv_buf = cfg_set_own_addr(net);
	break;
	case TIPC_CMD_SET_NETID:
	rep_tlv_buf = cfg_set_netid(net);
	break;
	case TIPC_CMD_GET_NETID:
	rep_tlv_buf = tipc_cfg_reply_unsigned(tn->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_SET_REMOTE_MNG:
	case TIPC_CMD_GET_REMOTE_MNG:
	case TIPC_CMD_DUMP_LOG:
	case TIPC_CMD_SET_MAX_PORTS:
	case TIPC_CMD_GET_MAX_PORTS:
	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:
	rtnl_unlock();
	return rep_tlv_buf;
	}