/*
   * net/tipc/netlink.c: TIPC configuration handling

   *

   * Copyright (c) 2005-2006, 2014, Ericsson AB

   * Copyright (c) 2005-2007, 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 "bearer.h"

  #include "link.h"

  #include "node.h"

  #include "net.h"

  #include "udp_media.h"

  #include <net/genetlink.h>

  static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
  	[TIPC_NLA_UNSPEC]	= { .type = NLA_UNSPEC, },
  	[TIPC_NLA_BEARER]	= { .type = NLA_NESTED, },

  	[TIPC_NLA_SOCK]		= { .type = NLA_NESTED, },

  	[TIPC_NLA_PUBL]		= { .type = NLA_NESTED, },
  	[TIPC_NLA_LINK]		= { .type = NLA_NESTED, },

  	[TIPC_NLA_MEDIA]	= { .type = NLA_NESTED, },

  	[TIPC_NLA_NODE]		= { .type = NLA_NESTED, },

  	[TIPC_NLA_NET]		= { .type = NLA_NESTED, },

  	[TIPC_NLA_NAME_TABLE]	= { .type = NLA_NESTED, },
  	[TIPC_NLA_MON]		= { .type = NLA_NESTED, },

  };

  const struct nla_policy
  tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
  	[TIPC_NLA_NAME_TABLE_UNSPEC]	= { .type = NLA_UNSPEC },
  	[TIPC_NLA_NAME_TABLE_PUBL]	= { .type = NLA_NESTED }
  };

  const struct nla_policy tipc_nl_monitor_policy[TIPC_NLA_MON_MAX + 1] = {
  	[TIPC_NLA_MON_UNSPEC]			= { .type = NLA_UNSPEC },

  	[TIPC_NLA_MON_REF]			= { .type = NLA_U32 },

  	[TIPC_NLA_MON_ACTIVATION_THRESHOLD]	= { .type = NLA_U32 },
  };

  const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
  	[TIPC_NLA_SOCK_UNSPEC]		= { .type = NLA_UNSPEC },
  	[TIPC_NLA_SOCK_ADDR]		= { .type = NLA_U32 },
  	[TIPC_NLA_SOCK_REF]		= { .type = NLA_U32 },
  	[TIPC_NLA_SOCK_CON]		= { .type = NLA_NESTED },
  	[TIPC_NLA_SOCK_HAS_PUBL]	= { .type = NLA_FLAG }
  };
  
  const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
  	[TIPC_NLA_NET_UNSPEC]		= { .type = NLA_UNSPEC },

  	[TIPC_NLA_NET_ID]		= { .type = NLA_U32 },
  	[TIPC_NLA_NET_ADDR]		= { .type = NLA_U32 },

  };
  
  const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
  	[TIPC_NLA_LINK_UNSPEC]		= { .type = NLA_UNSPEC },
  	[TIPC_NLA_LINK_NAME]		= { .type = NLA_STRING,
  					    .len = TIPC_MAX_LINK_NAME },
  	[TIPC_NLA_LINK_MTU]		= { .type = NLA_U32 },
  	[TIPC_NLA_LINK_BROADCAST]	= { .type = NLA_FLAG },
  	[TIPC_NLA_LINK_UP]		= { .type = NLA_FLAG },
  	[TIPC_NLA_LINK_ACTIVE]		= { .type = NLA_FLAG },
  	[TIPC_NLA_LINK_PROP]		= { .type = NLA_NESTED },
  	[TIPC_NLA_LINK_STATS]		= { .type = NLA_NESTED },
  	[TIPC_NLA_LINK_RX]		= { .type = NLA_U32 },
  	[TIPC_NLA_LINK_TX]		= { .type = NLA_U32 }
  };
  
  const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
  	[TIPC_NLA_NODE_UNSPEC]		= { .type = NLA_UNSPEC },
  	[TIPC_NLA_NODE_ADDR]		= { .type = NLA_U32 },
  	[TIPC_NLA_NODE_UP]		= { .type = NLA_FLAG }
  };
  
  /* Properties valid for media, bearer and link */
  const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
  	[TIPC_NLA_PROP_UNSPEC]		= { .type = NLA_UNSPEC },
  	[TIPC_NLA_PROP_PRIO]		= { .type = NLA_U32 },
  	[TIPC_NLA_PROP_TOL]		= { .type = NLA_U32 },
  	[TIPC_NLA_PROP_WIN]		= { .type = NLA_U32 }
  };
  
  const struct nla_policy tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]	= {
  	[TIPC_NLA_BEARER_UNSPEC]	= { .type = NLA_UNSPEC },
  	[TIPC_NLA_BEARER_NAME]		= { .type = NLA_STRING,
  					    .len = TIPC_MAX_BEARER_NAME },
  	[TIPC_NLA_BEARER_PROP]		= { .type = NLA_NESTED },
  	[TIPC_NLA_BEARER_DOMAIN]	= { .type = NLA_U32 }
  };
  
  const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
  	[TIPC_NLA_MEDIA_UNSPEC]		= { .type = NLA_UNSPEC },
  	[TIPC_NLA_MEDIA_NAME]		= { .type = NLA_STRING },
  	[TIPC_NLA_MEDIA_PROP]		= { .type = NLA_NESTED }
  };
  
  const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
  	[TIPC_NLA_UDP_UNSPEC]	= {.type = NLA_UNSPEC},
  	[TIPC_NLA_UDP_LOCAL]	= {.type = NLA_BINARY,
  				   .len = sizeof(struct sockaddr_storage)},
  	[TIPC_NLA_UDP_REMOTE]	= {.type = NLA_BINARY,
  				   .len = sizeof(struct sockaddr_storage)},
  };

  /* Users of the legacy API (tipc-config) can't handle that we add operations,
   * so we have a separate genl handling for the new API.
   */

  static const struct genl_ops tipc_genl_v2_ops[] = {
  	{
  		.cmd	= TIPC_NL_BEARER_DISABLE,
  		.doit	= tipc_nl_bearer_disable,
  		.policy = tipc_nl_policy,
  	},
  	{
  		.cmd	= TIPC_NL_BEARER_ENABLE,
  		.doit	= tipc_nl_bearer_enable,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_BEARER_GET,
  		.doit	= tipc_nl_bearer_get,
  		.dumpit	= tipc_nl_bearer_dump,
  		.policy = tipc_nl_policy,

  	},
  	{

  		.cmd	= TIPC_NL_BEARER_ADD,
  		.doit	= tipc_nl_bearer_add,
  		.policy = tipc_nl_policy,
  	},
  	{

  		.cmd	= TIPC_NL_BEARER_SET,
  		.doit	= tipc_nl_bearer_set,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_SOCK_GET,
  		.dumpit	= tipc_nl_sk_dump,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_PUBL_GET,
  		.dumpit	= tipc_nl_publ_dump,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_LINK_GET,

  		.doit   = tipc_nl_node_get_link,

  		.dumpit	= tipc_nl_node_dump_link,

  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_LINK_SET,

  		.doit	= tipc_nl_node_set_link,

  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_LINK_RESET_STATS,

  		.doit   = tipc_nl_node_reset_link_stats,

  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_MEDIA_GET,
  		.doit	= tipc_nl_media_get,
  		.dumpit	= tipc_nl_media_dump,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_MEDIA_SET,
  		.doit	= tipc_nl_media_set,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_NODE_GET,
  		.dumpit	= tipc_nl_node_dump,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_NET_GET,
  		.dumpit	= tipc_nl_net_dump,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_NET_SET,
  		.doit	= tipc_nl_net_set,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_NAME_TABLE_GET,
  		.dumpit	= tipc_nl_name_table_dump,
  		.policy = tipc_nl_policy,

  	},
  	{
  		.cmd	= TIPC_NL_MON_SET,
  		.doit	= tipc_nl_node_set_monitor,
  		.policy = tipc_nl_policy,
  	},

  	{
  		.cmd	= TIPC_NL_MON_GET,
  		.doit	= tipc_nl_node_get_monitor,

  		.dumpit	= tipc_nl_node_dump_monitor,
  		.policy = tipc_nl_policy,
  	},
  	{
  		.cmd	= TIPC_NL_MON_PEER_GET,
  		.dumpit	= tipc_nl_node_dump_monitor_peer,

  		.policy = tipc_nl_policy,
  	},

  	{
  		.cmd	= TIPC_NL_PEER_REMOVE,
  		.doit	= tipc_nl_peer_rm,
  		.policy = tipc_nl_policy,

  	},
  #ifdef CONFIG_TIPC_MEDIA_UDP
  	{
  		.cmd	= TIPC_NL_UDP_GET_REMOTEIP,
  		.dumpit	= tipc_udp_nl_dump_remoteip,
  		.policy = tipc_nl_policy,
  	},
  #endif

  };

  struct genl_family tipc_genl_family __ro_after_init = {

  	.name		= TIPC_GENL_V2_NAME,
  	.version	= TIPC_GENL_V2_VERSION,
  	.hdrsize	= 0,
  	.maxattr	= TIPC_NLA_MAX,
  	.netnsok	= true,
  	.module		= THIS_MODULE,
  	.ops		= tipc_genl_v2_ops,
  	.n_ops		= ARRAY_SIZE(tipc_genl_v2_ops),
  };

  int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
  {

  	u32 maxattr = tipc_genl_family.maxattr;

  	*attr = genl_family_attrbuf(&tipc_genl_family);

  	if (!*attr)
  		return -EOPNOTSUPP;

  	return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy,
  			   NULL);

  }

  int __init tipc_netlink_start(void)

  {

  	int res;

  	res = genl_register_family(&tipc_genl_family);

  	if (res) {

  		pr_err("Failed to register netlink interface
  ");

  		return res;
  	}

  	return 0;

  }

  void tipc_netlink_stop(void)

  {

  	genl_unregister_family(&tipc_genl_family);

  }