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