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#!/usr/bin/env bpftrace
/*
* tcpaccept.bt Trace TCP accept()s
* For Linux, uses bpftrace and eBPF.
*
* USAGE: tcpaccept.bt
*
* This is a bpftrace version of the bcc tool of the same name.
*
* This uses dynamic tracing of the kernel inet_csk_accept() socket function
* (from tcp_prot.accept), and will need to be modified to match kernel changes.
* Copyright (c) 2018 Dale Hamel.
* Licensed under the Apache License, Version 2.0 (the "License")
* 23-Nov-2018 Dale Hamel created this.
*/
#ifndef BPFTRACE_HAVE_BTF
#include <linux/socket.h>
#include <net/sock.h>
#else
#include <sys/socket.h>
#endif
BEGIN
{
printf("Tracing TCP accepts. Hit Ctrl-C to end.\n");
printf("%-8s %-6s %-14s ", "TIME", "PID", "COMM");
printf("%-39s %-5s %-39s %-5s %s\n", "RADDR", "RPORT", "LADDR",
"LPORT", "BL");
}
kretprobe:inet_csk_accept
{
$sk = (struct sock *)retval;
$inet_family = $sk->__sk_common.skc_family;
if ($inet_family == AF_INET || $inet_family == AF_INET6) {
// initialize variable type:
$daddr = ntop(0);
$saddr = ntop(0);
if ($inet_family == AF_INET) {
$daddr = ntop($sk->__sk_common.skc_daddr);
$saddr = ntop($sk->__sk_common.skc_rcv_saddr);
} else {
$daddr = ntop(
$sk->__sk_common.skc_v6_daddr.in6_u.u6_addr8);
$saddr = ntop(
$sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr8);
}
$lport = $sk->__sk_common.skc_num;
$dport = $sk->__sk_common.skc_dport;
$qlen = $sk->sk_ack_backlog;
$qmax = $sk->sk_max_ack_backlog;
// Destination port is big endian, it must be flipped
$dport = bswap($dport);
time("%H:%M:%S ");
printf("%-6d %-14s ", pid, comm);
printf("%-39s %-5d %-39s %-5d ", $daddr, $dport, $saddr,
$lport);
printf("%d/%d\n", $qlen, $qmax);
}
}
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