/*
   * net/tipc/diag.c: TIPC socket diag
   *
   * Copyright (c) 2018, Ericsson AB
   * 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 "ASIS"
   * 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 <linux/sock_diag.h>
  #include <linux/tipc_sockets_diag.h>
  
  static u64 __tipc_diag_gen_cookie(struct sock *sk)
  {
  	u32 res[2];
  
  	sock_diag_save_cookie(sk, res);
  	return *((u64 *)res);
  }
  
  static int __tipc_add_sock_diag(struct sk_buff *skb,
  				struct netlink_callback *cb,
  				struct tipc_sock *tsk)
  {
  	struct tipc_sock_diag_req *req = nlmsg_data(cb->nlh);
  	struct nlmsghdr *nlh;
  	int err;
  
  	nlh = nlmsg_put_answer(skb, cb, SOCK_DIAG_BY_FAMILY, 0,
  			       NLM_F_MULTI);
  	if (!nlh)
  		return -EMSGSIZE;

  	err = tipc_sk_fill_sock_diag(skb, cb, tsk, req->tidiag_states,

  				     __tipc_diag_gen_cookie);
  	if (err)
  		return err;
  
  	nlmsg_end(skb, nlh);
  	return 0;
  }
  
  static int tipc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
  {
  	return tipc_nl_sk_walk(skb, cb, __tipc_add_sock_diag);
  }
  
  static int tipc_sock_diag_handler_dump(struct sk_buff *skb,
  				       struct nlmsghdr *h)
  {
  	int hdrlen = sizeof(struct tipc_sock_diag_req);
  	struct net *net = sock_net(skb->sk);
  
  	if (nlmsg_len(h) < hdrlen)
  		return -EINVAL;
  
  	if (h->nlmsg_flags & NLM_F_DUMP) {
  		struct netlink_dump_control c = {

  			.start = tipc_dump_start,

  			.dump = tipc_diag_dump,

  			.done = tipc_dump_done,

  		};
  		netlink_dump_start(net->diag_nlsk, skb, h, &c);
  		return 0;
  	}
  	return -EOPNOTSUPP;
  }
  
  static const struct sock_diag_handler tipc_sock_diag_handler = {
  	.family = AF_TIPC,
  	.dump = tipc_sock_diag_handler_dump,
  };
  
  static int __init tipc_diag_init(void)
  {
  	return sock_diag_register(&tipc_sock_diag_handler);
  }
  
  static void __exit tipc_diag_exit(void)
  {
  	sock_diag_unregister(&tipc_sock_diag_handler);
  }
  
  module_init(tipc_diag_init);
  module_exit(tipc_diag_exit);
  
  MODULE_LICENSE("Dual BSD/GPL");
  MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);