tools/tcpaccept.py - platform/external/bcc - Git at Google

 #!/usr/bin/env python
 # @lint-avoid-python-3-compatibility-imports
 #
 # tcpaccept Trace TCP accept()s.
 #           For Linux, uses BCC, eBPF. Embedded C.
 #
 # USAGE: tcpaccept [-h] [-t] [-p PID]
 #
 # 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) 2015 Brendan Gregg.
 # Licensed under the Apache License, Version 2.0 (the "License")
 #
 # 13-Oct-2015   Brendan Gregg   Created this.
 # 14-Feb-2016      "      "     Switch to bpf_perf_output.

 from __future__ import print_function
 from bcc import BPF
 from socket import inet_ntop, AF_INET, AF_INET6
 from struct import pack
 import argparse
 import ctypes as ct
 from bcc.utils import printb

 # arguments
 examples = """examples:
     ./tcpaccept           # trace all TCP accept()s
     ./tcpaccept -t        # include timestamps
     ./tcpaccept -p 181    # only trace PID 181
 """
 parser = argparse.ArgumentParser(
     description="Trace TCP accepts",
     formatter_class=argparse.RawDescriptionHelpFormatter,
     epilog=examples)
 parser.add_argument("-t", "--timestamp", action="store_true",
     help="include timestamp on output")
 parser.add_argument("-p", "--pid",
     help="trace this PID only")
 parser.add_argument("--ebpf", action="store_true",
     help=argparse.SUPPRESS)
 args = parser.parse_args()
 debug = 0

 # define BPF program
 bpf_text = """
 #include <uapi/linux/ptrace.h>
 #include <net/sock.h>
 #include <bcc/proto.h>

 // separate data structs for ipv4 and ipv6
 struct ipv4_data_t {
     u64 ts_us;
     u32 pid;
     u32 saddr;
     u32 daddr;
     u64 ip;
     u16 lport;
     char task[TASK_COMM_LEN];
 };
 BPF_PERF_OUTPUT(ipv4_events);

 struct ipv6_data_t {
     u64 ts_us;
     u32 pid;
     unsigned __int128 saddr;
     unsigned __int128 daddr;
     u64 ip;
     u16 lport;
     char task[TASK_COMM_LEN];
 };
 BPF_PERF_OUTPUT(ipv6_events);
 """

 #
 # The following is the code for older kernels(Linux pre-4.16).
 # It uses kprobes to instrument inet_csk_accept(). On Linux 4.16 and
 # later, the sock:inet_sock_set_state tracepoint should be used instead, as
 # is done by the code that follows this.
 #
 bpf_text_kprobe = """
 int kretprobe__inet_csk_accept(struct pt_regs *ctx)
 {
     struct sock *newsk = (struct sock *)PT_REGS_RC(ctx);
     u32 pid = bpf_get_current_pid_tgid();

     ##FILTER_PID##

     if (newsk == NULL)
         return 0;

     // check this is TCP
     u8 protocol = 0;
     // workaround for reading the sk_protocol bitfield:

     // Following comments add by Joe Yin:
     // Unfortunately,it can not work since Linux 4.10,
     // because the sk_wmem_queued is not following the bitfield of sk_protocol.
     // And the following member is sk_gso_max_segs.
     // So, we can use this:
     // bpf_probe_read(&protocol, 1, (void *)((u64)&newsk->sk_gso_max_segs) - 3);
     // In order to  diff the pre-4.10 and 4.10+ ,introduce the variables gso_max_segs_offset,sk_lingertime,
     // sk_lingertime is closed to the gso_max_segs_offset,and
     // the offset between the two members is 4

     int gso_max_segs_offset = offsetof(struct sock, sk_gso_max_segs);
     int sk_lingertime_offset = offsetof(struct sock, sk_lingertime);

     if (sk_lingertime_offset - gso_max_segs_offset == 4)
         // 4.10+ with little endian
 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
         protocol = *(u8 *)((u64)&newsk->sk_gso_max_segs - 3);
     else
         // pre-4.10 with little endian
         protocol = *(u8 *)((u64)&newsk->sk_wmem_queued - 3);
 #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
         // 4.10+ with big endian
         protocol = *(u8 *)((u64)&newsk->sk_gso_max_segs - 1);
     else
         // pre-4.10 with big endian
         protocol = *(u8 *)((u64)&newsk->sk_wmem_queued - 1);
 #else
 # error "Fix your compiler's __BYTE_ORDER__?!"
 #endif

     if (protocol != IPPROTO_TCP)
         return 0;

     // pull in details
     u16 family = 0, lport = 0;
     family = newsk->__sk_common.skc_family;
     lport = newsk->__sk_common.skc_num;

     if (family == AF_INET) {
         struct ipv4_data_t data4 = {.pid = pid, .ip = 4};
         data4.ts_us = bpf_ktime_get_ns() / 1000;
         data4.saddr = newsk->__sk_common.skc_rcv_saddr;
         data4.daddr = newsk->__sk_common.skc_daddr;
         data4.lport = lport;
         bpf_get_current_comm(&data4.task, sizeof(data4.task));
         ipv4_events.perf_submit(ctx, &data4, sizeof(data4));

     } else if (family == AF_INET6) {
         struct ipv6_data_t data6 = {.pid = pid, .ip = 6};
         data6.ts_us = bpf_ktime_get_ns() / 1000;
         bpf_probe_read(&data6.saddr, sizeof(data6.saddr),
             &newsk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32);
         bpf_probe_read(&data6.daddr, sizeof(data6.daddr),
             &newsk->__sk_common.skc_v6_daddr.in6_u.u6_addr32);
         data6.lport = lport;
         bpf_get_current_comm(&data6.task, sizeof(data6.task));
         ipv6_events.perf_submit(ctx, &data6, sizeof(data6));
     }
     // else drop

     return 0;
 }
 """

 bpf_text_tracepoint = """
 TRACEPOINT_PROBE(sock, inet_sock_set_state)
 {
     if (args->protocol != IPPROTO_TCP)
         return 0;
     u32 pid = bpf_get_current_pid_tgid();

     ##FILTER_PID##

     // pull in details
     u16 family = 0, lport = 0;
     family = args->family;
     lport = args->sport;

     if (family == AF_INET) {
         struct ipv4_data_t data4 = {.pid = pid, .ip = 4};
         data4.ts_us = bpf_ktime_get_ns() / 1000;
         __builtin_memcpy(&data4.saddr, args->saddr, sizeof(data4.saddr));
         __builtin_memcpy(&data4.daddr, args->daddr, sizeof(data4.daddr));
         data4.lport = lport;
         bpf_get_current_comm(&data4.task, sizeof(data4.task));
         ipv4_events.perf_submit(args, &data4, sizeof(data4));
     } else if (family == AF_INET6) {
         struct ipv6_data_t data6 = {.pid = pid, .ip = 6};
         data6.ts_us = bpf_ktime_get_ns() / 1000;
         __builtin_memcpy(&data6.saddr, args->saddr, sizeof(data6.saddr));
         __builtin_memcpy(&data6.daddr, args->daddr, sizeof(data6.daddr));
         data6.lport = lport;
         bpf_get_current_comm(&data6.task, sizeof(data6.task));
         ipv6_events.perf_submit(args, &data6, sizeof(data6));
     }
     // else drop

     return 0;
 }
 """

 if (BPF.tracepoint_exists("sock", "inet_sock_set_state")):
     bpf_text += bpf_text_tracepoint
 else:
     bpf_text += bpf_text_kprobe


 # code substitutions
 if args.pid:
     bpf_text = bpf_text.replace('##FILTER_PID##',
         'if (pid != %s) { return 0; }' % args.pid)
 else:
     bpf_text = bpf_text.replace('##FILTER_PID##', '')
 if debug or args.ebpf:
     print(bpf_text)
     if args.ebpf:
         exit()

 # event data
 TASK_COMM_LEN = 16      # linux/sched.h

 class Data_ipv4(ct.Structure):
     _fields_ = [
         ("ts_us", ct.c_ulonglong),
         ("pid", ct.c_uint),
         ("saddr", ct.c_uint),
         ("daddr", ct.c_uint),
         ("ip", ct.c_ulonglong),
         ("lport", ct.c_ushort),
         ("task", ct.c_char * TASK_COMM_LEN)
     ]

 class Data_ipv6(ct.Structure):
     _fields_ = [
         ("ts_us", ct.c_ulonglong),
         ("pid", ct.c_uint),
         ("saddr", (ct.c_ulonglong * 2)),
         ("daddr", (ct.c_ulonglong * 2)),
         ("ip", ct.c_ulonglong),
         ("lport", ct.c_ushort),
         ("task", ct.c_char * TASK_COMM_LEN)
     ]

 # process event
 def print_ipv4_event(cpu, data, size):
     event = ct.cast(data, ct.POINTER(Data_ipv4)).contents
     global start_ts
     if args.timestamp:
         if start_ts == 0:
             start_ts = event.ts_us
         print("%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), end="")
     printb(b"%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid,
         event.task, event.ip,
         inet_ntop(AF_INET, pack("I", event.daddr)).encode(),
         inet_ntop(AF_INET, pack("I", event.saddr)).encode(),
         event.lport))

 def print_ipv6_event(cpu, data, size):
     event = ct.cast(data, ct.POINTER(Data_ipv6)).contents
     global start_ts
     if args.timestamp:
         if start_ts == 0:
             start_ts = event.ts_us
         print("%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), end="")
     printb(b"%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid,
         event.task, event.ip,
         inet_ntop(AF_INET6, event.daddr).encode(),
         inet_ntop(AF_INET6, event.saddr).encode(),
         event.lport))

 # initialize BPF
 b = BPF(text=bpf_text)

 # header
 if args.timestamp:
     print("%-9s" % ("TIME(s)"), end="")
 print("%-6s %-12s %-2s %-16s %-16s %-4s" % ("PID", "COMM", "IP", "RADDR",
     "LADDR", "LPORT"))

 start_ts = 0

 # read events
 b["ipv4_events"].open_perf_buffer(print_ipv4_event)
 b["ipv6_events"].open_perf_buffer(print_ipv6_event)
 while 1:
     try:
         b.perf_buffer_poll()
     except KeyboardInterrupt:
         exit()
	#!/usr/bin/env python
	# @lint-avoid-python-3-compatibility-imports
	#
	# tcpaccept Trace TCP accept()s.
	# For Linux, uses BCC, eBPF. Embedded C.
	#
	# USAGE: tcpaccept [-h] [-t] [-p PID]
	#
	# 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) 2015 Brendan Gregg.
	# Licensed under the Apache License, Version 2.0 (the "License")
	#
	# 13-Oct-2015 Brendan Gregg Created this.
	# 14-Feb-2016 " " Switch to bpf_perf_output.

	from __future__ import print_function
	from bcc import BPF
	from socket import inet_ntop, AF_INET, AF_INET6
	from struct import pack
	import argparse
	import ctypes as ct
	from bcc.utils import printb

	# arguments
	examples = """examples:
	./tcpaccept # trace all TCP accept()s
	./tcpaccept -t # include timestamps
	./tcpaccept -p 181 # only trace PID 181
	"""
	parser = argparse.ArgumentParser(
	description="Trace TCP accepts",
	formatter_class=argparse.RawDescriptionHelpFormatter,
	epilog=examples)
	parser.add_argument("-t", "--timestamp", action="store_true",
	help="include timestamp on output")
	parser.add_argument("-p", "--pid",
	help="trace this PID only")
	parser.add_argument("--ebpf", action="store_true",
	help=argparse.SUPPRESS)
	args = parser.parse_args()
	debug = 0

	# define BPF program
	bpf_text = """
	#include <uapi/linux/ptrace.h>
	#include <net/sock.h>
	#include <bcc/proto.h>

	// separate data structs for ipv4 and ipv6
	struct ipv4_data_t {
	u64 ts_us;
	u32 pid;
	u32 saddr;
	u32 daddr;
	u64 ip;
	u16 lport;
	char task[TASK_COMM_LEN];
	};
	BPF_PERF_OUTPUT(ipv4_events);

	struct ipv6_data_t {
	u64 ts_us;
	u32 pid;
	unsigned __int128 saddr;
	unsigned __int128 daddr;
	u64 ip;
	u16 lport;
	char task[TASK_COMM_LEN];
	};
	BPF_PERF_OUTPUT(ipv6_events);
	"""

	#
	# The following is the code for older kernels(Linux pre-4.16).
	# It uses kprobes to instrument inet_csk_accept(). On Linux 4.16 and
	# later, the sock:inet_sock_set_state tracepoint should be used instead, as
	# is done by the code that follows this.
	#
	bpf_text_kprobe = """
	int kretprobe__inet_csk_accept(struct pt_regs *ctx)
	{
	struct sock newsk = (struct sock )PT_REGS_RC(ctx);
	u32 pid = bpf_get_current_pid_tgid();

	##FILTER_PID##

	if (newsk == NULL)
	return 0;

	// check this is TCP
	u8 protocol = 0;
	// workaround for reading the sk_protocol bitfield:

	// Following comments add by Joe Yin:
	// Unfortunately,it can not work since Linux 4.10,
	// because the sk_wmem_queued is not following the bitfield of sk_protocol.
	// And the following member is sk_gso_max_segs.
	// So, we can use this:
	// bpf_probe_read(&protocol, 1, (void *)((u64)&newsk->sk_gso_max_segs) - 3);
	// In order to diff the pre-4.10 and 4.10+ ,introduce the variables gso_max_segs_offset,sk_lingertime,
	// sk_lingertime is closed to the gso_max_segs_offset,and
	// the offset between the two members is 4

	int gso_max_segs_offset = offsetof(struct sock, sk_gso_max_segs);
	int sk_lingertime_offset = offsetof(struct sock, sk_lingertime);

	if (sk_lingertime_offset - gso_max_segs_offset == 4)
	// 4.10+ with little endian
	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	protocol = (u8 )((u64)&newsk->sk_gso_max_segs - 3);
	else
	// pre-4.10 with little endian
	protocol = (u8 )((u64)&newsk->sk_wmem_queued - 3);
	#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	// 4.10+ with big endian
	protocol = (u8 )((u64)&newsk->sk_gso_max_segs - 1);
	else
	// pre-4.10 with big endian
	protocol = (u8 )((u64)&newsk->sk_wmem_queued - 1);
	#else
	# error "Fix your compiler's __BYTE_ORDER__?!"
	#endif

	if (protocol != IPPROTO_TCP)
	return 0;

	// pull in details
	u16 family = 0, lport = 0;
	family = newsk->__sk_common.skc_family;
	lport = newsk->__sk_common.skc_num;

	if (family == AF_INET) {
	struct ipv4_data_t data4 = {.pid = pid, .ip = 4};
	data4.ts_us = bpf_ktime_get_ns() / 1000;
	data4.saddr = newsk->__sk_common.skc_rcv_saddr;
	data4.daddr = newsk->__sk_common.skc_daddr;
	data4.lport = lport;
	bpf_get_current_comm(&data4.task, sizeof(data4.task));
	ipv4_events.perf_submit(ctx, &data4, sizeof(data4));

	} else if (family == AF_INET6) {
	struct ipv6_data_t data6 = {.pid = pid, .ip = 6};
	data6.ts_us = bpf_ktime_get_ns() / 1000;
	bpf_probe_read(&data6.saddr, sizeof(data6.saddr),
	&newsk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32);
	bpf_probe_read(&data6.daddr, sizeof(data6.daddr),
	&newsk->__sk_common.skc_v6_daddr.in6_u.u6_addr32);
	data6.lport = lport;
	bpf_get_current_comm(&data6.task, sizeof(data6.task));
	ipv6_events.perf_submit(ctx, &data6, sizeof(data6));
	}
	// else drop

	return 0;
	}
	"""

	bpf_text_tracepoint = """
	TRACEPOINT_PROBE(sock, inet_sock_set_state)
	{
	if (args->protocol != IPPROTO_TCP)
	return 0;
	u32 pid = bpf_get_current_pid_tgid();

	##FILTER_PID##

	// pull in details
	u16 family = 0, lport = 0;
	family = args->family;
	lport = args->sport;

	if (family == AF_INET) {
	struct ipv4_data_t data4 = {.pid = pid, .ip = 4};
	data4.ts_us = bpf_ktime_get_ns() / 1000;
	__builtin_memcpy(&data4.saddr, args->saddr, sizeof(data4.saddr));
	__builtin_memcpy(&data4.daddr, args->daddr, sizeof(data4.daddr));
	data4.lport = lport;
	bpf_get_current_comm(&data4.task, sizeof(data4.task));
	ipv4_events.perf_submit(args, &data4, sizeof(data4));
	} else if (family == AF_INET6) {
	struct ipv6_data_t data6 = {.pid = pid, .ip = 6};
	data6.ts_us = bpf_ktime_get_ns() / 1000;
	__builtin_memcpy(&data6.saddr, args->saddr, sizeof(data6.saddr));
	__builtin_memcpy(&data6.daddr, args->daddr, sizeof(data6.daddr));
	data6.lport = lport;
	bpf_get_current_comm(&data6.task, sizeof(data6.task));
	ipv6_events.perf_submit(args, &data6, sizeof(data6));
	}
	// else drop

	return 0;
	}
	"""

	if (BPF.tracepoint_exists("sock", "inet_sock_set_state")):
	bpf_text += bpf_text_tracepoint
	else:
	bpf_text += bpf_text_kprobe


	# code substitutions
	if args.pid:
	bpf_text = bpf_text.replace('##FILTER_PID##',
	'if (pid != %s) { return 0; }' % args.pid)
	else:
	bpf_text = bpf_text.replace('##FILTER_PID##', '')
	if debug or args.ebpf:
	print(bpf_text)
	if args.ebpf:
	exit()

	# event data
	TASK_COMM_LEN = 16 # linux/sched.h

	class Data_ipv4(ct.Structure):
	_fields_ = [
	("ts_us", ct.c_ulonglong),
	("pid", ct.c_uint),
	("saddr", ct.c_uint),
	("daddr", ct.c_uint),
	("ip", ct.c_ulonglong),
	("lport", ct.c_ushort),
	("task", ct.c_char * TASK_COMM_LEN)
	]

	class Data_ipv6(ct.Structure):
	_fields_ = [
	("ts_us", ct.c_ulonglong),
	("pid", ct.c_uint),
	("saddr", (ct.c_ulonglong * 2)),
	("daddr", (ct.c_ulonglong * 2)),
	("ip", ct.c_ulonglong),
	("lport", ct.c_ushort),
	("task", ct.c_char * TASK_COMM_LEN)
	]

	# process event
	def print_ipv4_event(cpu, data, size):
	event = ct.cast(data, ct.POINTER(Data_ipv4)).contents
	global start_ts
	if args.timestamp:
	if start_ts == 0:
	start_ts = event.ts_us
	print("%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), end="")
	printb(b"%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid,
	event.task, event.ip,
	inet_ntop(AF_INET, pack("I", event.daddr)).encode(),
	inet_ntop(AF_INET, pack("I", event.saddr)).encode(),
	event.lport))

	def print_ipv6_event(cpu, data, size):
	event = ct.cast(data, ct.POINTER(Data_ipv6)).contents
	global start_ts
	if args.timestamp:
	if start_ts == 0:
	start_ts = event.ts_us
	print("%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), end="")
	printb(b"%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid,
	event.task, event.ip,
	inet_ntop(AF_INET6, event.daddr).encode(),
	inet_ntop(AF_INET6, event.saddr).encode(),
	event.lport))

	# initialize BPF
	b = BPF(text=bpf_text)

	# header
	if args.timestamp:
	print("%-9s" % ("TIME(s)"), end="")
	print("%-6s %-12s %-2s %-16s %-16s %-4s" % ("PID", "COMM", "IP", "RADDR",
	"LADDR", "LPORT"))

	start_ts = 0

	# read events
	b["ipv4_events"].open_perf_buffer(print_ipv4_event)
	b["ipv6_events"].open_perf_buffer(print_ipv6_event)
	while 1:
	try:
	b.perf_buffer_poll()
	except KeyboardInterrupt:
	exit()