xref: /linux/net/dccp/diag.c (revision 37744feebc086908fd89760650f458ab19071750)
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 
16 static 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 
39 static 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 
48 static 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 
54 static 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 
60 static 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 
68 static int __init dccp_diag_init(void)
69 {
70 	return inet_diag_register(&dccp_diag_handler);
71 }
72 
73 static void __exit dccp_diag_fini(void)
74 {
75 	inet_diag_unregister(&dccp_diag_handler);
76 }
77 
78 module_init(dccp_diag_init);
79 module_exit(dccp_diag_fini);
80 
81 MODULE_LICENSE("GPL");
82 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
83 MODULE_DESCRIPTION("DCCP inet_diag handler");
84 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);
85