diag.c

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/*
 *  net/dccp/diag.c
 *
 *  An implementation of the DCCP protocol
 *  Arnaldo Carvalho de Melo <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */


#include <linux/module.h>
#include <linux/inet_diag.h>

#include "ccid.h"
#include "dccp.h"

static void dccp_get_info(struct sock *sk, struct tcp_info *info)
{
    struct dccp_sock *dp = dccp_sk(sk);
    const struct inet_connection_sock *icsk = inet_csk(sk);

    memset(info, 0, sizeof(*info));

    info->tcpi_state    = sk->sk_state;
    info->tcpi_retransmits  = icsk->icsk_retransmits;
    info->tcpi_probes   = icsk->icsk_probes_out;
    info->tcpi_backoff  = icsk->icsk_backoff;
    info->tcpi_pmtu     = icsk->icsk_pmtu_cookie;

    if (dp->dccps_hc_rx_ackvec != NULL)
        info->tcpi_options |= TCPI_OPT_SACK;

    if (dp->dccps_hc_rx_ccid != NULL)
        ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);

    if (dp->dccps_hc_tx_ccid != NULL)
        ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
}

static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
                   void *_info)
{
    r->idiag_rqueue = r->idiag_wqueue = 0;

    if (_info != NULL)
        dccp_get_info(sk, _info);
}

static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
        struct inet_diag_req_v2 *r, struct nlattr *bc)
{
    inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r, bc);
}

static int dccp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
        struct inet_diag_req_v2 *req)
{
    return inet_diag_dump_one_icsk(&dccp_hashinfo, in_skb, nlh, req);
}

static const struct inet_diag_handler dccp_diag_handler = {
    .dump        = dccp_diag_dump,
    .dump_one    = dccp_diag_dump_one,
    .idiag_get_info  = dccp_diag_get_info,
    .idiag_type  = IPPROTO_DCCP,
};

static int __init dccp_diag_init(void)
{
    return inet_diag_register(&dccp_diag_handler);
}

static void __exit dccp_diag_fini(void)
{
    inet_diag_unregister(&dccp_diag_handler);
}

module_init(dccp_diag_init);
module_exit(dccp_diag_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arnaldo Carvalho de Melo <[email protected]>");
MODULE_DESCRIPTION("DCCP inet_diag handler");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);