/net/dccp/diag.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *  net/dccp/diag.c
 4 *
 5 *  An implementation of the DCCP protocol
 6 *  Arnaldo Carvalho de Melo <acme@mandriva.com>
 7 */
 8
 9
10#include <linux/module.h>
11#include <linux/inet_diag.h>
12
13#include "ccid.h"
14#include "dccp.h"
15
16static void dccp_get_info(struct sock *sk, struct tcp_info *info)
17{
18	struct dccp_sock *dp = dccp_sk(sk);
19	const struct inet_connection_sock *icsk = inet_csk(sk);
20
21	memset(info, 0, sizeof(*info));
22
23	info->tcpi_state	= sk->sk_state;
24	info->tcpi_retransmits	= icsk->icsk_retransmits;
25	info->tcpi_probes	= icsk->icsk_probes_out;
26	info->tcpi_backoff	= icsk->icsk_backoff;
27	info->tcpi_pmtu		= icsk->icsk_pmtu_cookie;
28
29	if (dp->dccps_hc_rx_ackvec != NULL)
30		info->tcpi_options |= TCPI_OPT_SACK;
31
32	if (dp->dccps_hc_rx_ccid != NULL)
33		ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
34
35	if (dp->dccps_hc_tx_ccid != NULL)
36		ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
37}
38
39static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
40			       void *_info)
41{
42	r->idiag_rqueue = r->idiag_wqueue = 0;
43
44	if (_info != NULL)
45		dccp_get_info(sk, _info);
46}
47
48static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
49			   const struct inet_diag_req_v2 *r)
50{
51	inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r);
52}
53
54static int dccp_diag_dump_one(struct netlink_callback *cb,
55			      const struct inet_diag_req_v2 *req)
56{
57	return inet_diag_dump_one_icsk(&dccp_hashinfo, cb, req);
58}
59
60static const struct inet_diag_handler dccp_diag_handler = {
61	.dump		 = dccp_diag_dump,
62	.dump_one	 = dccp_diag_dump_one,
63	.idiag_get_info	 = dccp_diag_get_info,
64	.idiag_type	 = IPPROTO_DCCP,
65	.idiag_info_size = sizeof(struct tcp_info),
66};
67
68static int __init dccp_diag_init(void)
69{
70	return inet_diag_register(&dccp_diag_handler);
71}
72
73static void __exit dccp_diag_fini(void)
74{
75	inet_diag_unregister(&dccp_diag_handler);
76}
77
78module_init(dccp_diag_init);
79module_exit(dccp_diag_fini);
80
81MODULE_LICENSE("GPL");
82MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
83MODULE_DESCRIPTION("DCCP inet_diag handler");
84MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);