net/dccp/diag.c

   1 /*
   2  *  net/dccp/diag.c
   3  *
   4  *  An implementation of the DCCP protocol
   5  *  Arnaldo Carvalho de Melo <acme@mandriva.com>
   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                            const 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,
  58                               const struct nlmsghdr *nlh,
  59                               const struct inet_diag_req_v2 *req)
  60 {
  61         return inet_diag_dump_one_icsk(&dccp_hashinfo, in_skb, nlh, req);
  62 }
  63
  64 static const struct inet_diag_handler dccp_diag_handler = {
  65         .dump            = dccp_diag_dump,
  66         .dump_one        = dccp_diag_dump_one,
  67         .idiag_get_info  = dccp_diag_get_info,
  68         .idiag_type      = IPPROTO_DCCP,
  69         .idiag_info_size = sizeof(struct tcp_info),
  70 };
  71
  72 static int __init dccp_diag_init(void)
  73 {
  74         return inet_diag_register(&dccp_diag_handler);
  75 }
  76
  77 static void __exit dccp_diag_fini(void)
  78 {
  79         inet_diag_unregister(&dccp_diag_handler);
  80 }
  81
  82 module_init(dccp_diag_init);
  83 module_exit(dccp_diag_fini);
  84
  85 MODULE_LICENSE("GPL");
  86 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
  87 MODULE_DESCRIPTION("DCCP inet_diag handler");
  88 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);