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106 lines
2.5 KiB
Python
Executable File
106 lines
2.5 KiB
Python
Executable File
# Copyright (c) Facebook, Inc. and its affiliates.
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# SPDX-License-Identifier: GPL-3.0+
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"""List all TCP sockets and their cgroup v2 paths"""
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import ipaddress
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import socket
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import struct
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from drgn import cast, container_of
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from drgn.helpers import enum_type_to_class
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from drgn.helpers.linux import (
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cgroup_path,
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hlist_for_each,
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hlist_nulls_empty,
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sk_fullsock,
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sk_nulls_for_each,
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sk_tcpstate,
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sock_cgroup_ptr,
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)
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TcpState = enum_type_to_class(
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prog["TCP_ESTABLISHED"].type_,
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"TcpState",
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exclude=("TCP_MAX_STATES",),
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prefix="TCP_",
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)
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def inet_sk(sk):
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return cast("struct inet_sock *", sk)
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def _ipv4(be32):
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return ipaddress.IPv4Address(struct.pack("I", be32.value_()))
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def _ipv6(in6_addr):
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return ipaddress.IPv6Address(struct.pack("IIII", *in6_addr.in6_u.u6_addr32))
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def _brackets(ip):
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if ip.version == 4:
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return "{}".format(ip.compressed)
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elif ip.version == 6:
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return "[{}]".format(ip.compressed)
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return ""
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def _ip_port(ip, port):
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return "{:>40}:{:<6}".format(_brackets(ip), port)
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def _print_sk(sk):
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inet = inet_sk(sk)
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tcp_state = TcpState(sk_tcpstate(sk))
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if sk.__sk_common.skc_family == socket.AF_INET:
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src_ip = _ipv4(sk.__sk_common.skc_rcv_saddr)
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dst_ip = _ipv4(sk.__sk_common.skc_daddr)
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elif sk.__sk_common.skc_family == socket.AF_INET6:
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src_ip = _ipv6(sk.__sk_common.skc_v6_rcv_saddr)
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dst_ip = _ipv6(sk.__sk_common.skc_v6_daddr)
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else:
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return
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src_port = socket.ntohs(inet.inet_sport)
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dst_port = socket.ntohs(sk.__sk_common.skc_dport)
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cgrp_path = ""
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if sk_fullsock(sk):
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cgrp = sock_cgroup_ptr(sk.sk_cgrp_data)
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cgrp_path = cgroup_path(cgrp).decode()
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print(
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"{:<12} {} {} {}".format(
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tcp_state.name,
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_ip_port(src_ip, src_port),
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_ip_port(dst_ip, dst_port),
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cgrp_path,
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)
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)
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# Uncomment to print whole struct:
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# print(sk)
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# print(inet)
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# print(cgrp)
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tcp_hashinfo = prog.object("tcp_hashinfo")
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# 1. Iterate over all TCP sockets in TCP_LISTEN state.
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for ilb in tcp_hashinfo.listening_hash:
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for pos in hlist_for_each(ilb.head):
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sk = container_of(pos, "struct sock", "__sk_common.skc_node")
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_print_sk(sk)
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# 2. And all other TCP sockets.
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for i in range(tcp_hashinfo.ehash_mask + 1):
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head = tcp_hashinfo.ehash[i].chain
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if hlist_nulls_empty(head):
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continue
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for sk in sk_nulls_for_each(head):
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_print_sk(sk)
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