// SPDX-License-Identifier: GPL-2.0-only

  /*
   *  net/dccp/diag.c
   *
   *  An implementation of the DCCP protocol
   *  Arnaldo Carvalho de Melo <acme@mandriva.com>

   */

  
  #include <linux/module.h>

  #include <linux/inet_diag.h>

  #include "ccid.h"

  #include "dccp.h"

  static void dccp_get_info(struct sock *sk, struct tcp_info *info)
  {
  	struct dccp_sock *dp = dccp_sk(sk);
  	const struct inet_connection_sock *icsk = inet_csk(sk);
  
  	memset(info, 0, sizeof(*info));
  
  	info->tcpi_state	= sk->sk_state;
  	info->tcpi_retransmits	= icsk->icsk_retransmits;
  	info->tcpi_probes	= icsk->icsk_probes_out;
  	info->tcpi_backoff	= icsk->icsk_backoff;

  	info->tcpi_pmtu		= icsk->icsk_pmtu_cookie;

  	if (dp->dccps_hc_rx_ackvec != NULL)

  		info->tcpi_options |= TCPI_OPT_SACK;

  	if (dp->dccps_hc_rx_ccid != NULL)
  		ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
  
  	if (dp->dccps_hc_tx_ccid != NULL)
  		ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);

  }

  static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,

  			       void *_info)
  {

  	r->idiag_rqueue = r->idiag_wqueue = 0;

  
  	if (_info != NULL)
  		dccp_get_info(sk, _info);

  }

  static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,

  			   const struct inet_diag_req_v2 *r)

  {

  	inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r);

  }

  static int dccp_diag_dump_one(struct netlink_callback *cb,

  			      const struct inet_diag_req_v2 *req)

  {

  	return inet_diag_dump_one_icsk(&dccp_hashinfo, cb, req);

  }

  static const struct inet_diag_handler dccp_diag_handler = {

  	.dump		 = dccp_diag_dump,
  	.dump_one	 = dccp_diag_dump_one,

  	.idiag_get_info	 = dccp_diag_get_info,

  	.idiag_type	 = IPPROTO_DCCP,

  	.idiag_info_size = sizeof(struct tcp_info),

  };
  
  static int __init dccp_diag_init(void)
  {
  	return inet_diag_register(&dccp_diag_handler);
  }
  
  static void __exit dccp_diag_fini(void)
  {
  	inet_diag_unregister(&dccp_diag_handler);
  }
  
  module_init(dccp_diag_init);
  module_exit(dccp_diag_fini);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
  MODULE_DESCRIPTION("DCCP inet_diag handler");

  MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);