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 .owner = THIS_MODULE,
62 .dump = dccp_diag_dump,
63 .dump_one = dccp_diag_dump_one,
64 .idiag_get_info = dccp_diag_get_info,
65 .idiag_type = IPPROTO_DCCP,
66 .idiag_info_size = sizeof(struct tcp_info),
67 };
68
69 static int __init dccp_diag_init(void)
70 {
71 return inet_diag_register(&dccp_diag_handler);
72 }
73
74 static void __exit dccp_diag_fini(void)
75 {
76 inet_diag_unregister(&dccp_diag_handler);
77 }
78
79 module_init(dccp_diag_init);
80 module_exit(dccp_diag_fini);
81
82 MODULE_LICENSE("GPL");
83 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
84 MODULE_DESCRIPTION("DCCP inet_diag handler");
85 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);
86
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