Linux Kernel  3.7.1
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diag.c
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1 /*
2  * net/dccp/diag.c
3  *
4  * An implementation of the DCCP protocol
5  * Arnaldo Carvalho de Melo <[email protected]>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 
13 #include <linux/module.h>
14 #include <linux/inet_diag.h>
15 
16 #include "ccid.h"
17 #include "dccp.h"
18 
19 static void dccp_get_info(struct sock *sk, struct tcp_info *info)
20 {
21  struct dccp_sock *dp = dccp_sk(sk);
22  const struct inet_connection_sock *icsk = inet_csk(sk);
23 
24  memset(info, 0, sizeof(*info));
25 
26  info->tcpi_state = sk->sk_state;
27  info->tcpi_retransmits = icsk->icsk_retransmits;
28  info->tcpi_probes = icsk->icsk_probes_out;
29  info->tcpi_backoff = icsk->icsk_backoff;
30  info->tcpi_pmtu = icsk->icsk_pmtu_cookie;
31 
32  if (dp->dccps_hc_rx_ackvec != NULL)
33  info->tcpi_options |= TCPI_OPT_SACK;
34 
35  if (dp->dccps_hc_rx_ccid != NULL)
36  ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
37 
38  if (dp->dccps_hc_tx_ccid != NULL)
39  ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
40 }
41 
42 static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
43  void *_info)
44 {
45  r->idiag_rqueue = r->idiag_wqueue = 0;
46 
47  if (_info != NULL)
48  dccp_get_info(sk, _info);
49 }
50 
51 static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
52  struct inet_diag_req_v2 *r, struct nlattr *bc)
53 {
54  inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r, bc);
55 }
56 
57 static int dccp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
58  struct inet_diag_req_v2 *req)
59 {
60  return inet_diag_dump_one_icsk(&dccp_hashinfo, in_skb, nlh, req);
61 }
62 
63 static const struct inet_diag_handler dccp_diag_handler = {
64  .dump = dccp_diag_dump,
65  .dump_one = dccp_diag_dump_one,
66  .idiag_get_info = dccp_diag_get_info,
67  .idiag_type = IPPROTO_DCCP,
68 };
69 
70 static int __init dccp_diag_init(void)
71 {
72  return inet_diag_register(&dccp_diag_handler);
73 }
74 
75 static void __exit dccp_diag_fini(void)
76 {
77  inet_diag_unregister(&dccp_diag_handler);
78 }
79 
80 module_init(dccp_diag_init);
81 module_exit(dccp_diag_fini);
82 
83 MODULE_LICENSE("GPL");
84 MODULE_AUTHOR("Arnaldo Carvalho de Melo <[email protected]>");
85 MODULE_DESCRIPTION("DCCP inet_diag handler");
86 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);