From: Waldemar Kozaczuk <jwkozac...@gmail.com>
Committer: Waldemar Kozaczuk <jwkozac...@gmail.com>
Branch: master
trace.py: show human-readable TCP state transitions
This commit slighly improves the --tcpdump option to present
the tcp_state tracepoint look less cryptic like so:
0xffff8000015c5040 netisr 0 1.172073258 tcp_state
tp=0xffffa00001e9bc00, CLOSED -> SYN_RECEIVED
0xffff8000015c5040 netisr 0 1.172079566 tcp_state
tp=0xffffa00001e9bc00, SYN_RECEIVED -> ESTABLISHED
0xffff800002064040 >/tests/tst-tcp 0 1.273263812 tcp_state
tp=0xffffa00001e9bc00, ESTABLISHED -> FIN_WAIT_1
0xffff8000015c5040 netisr 0 1.273368587 tcp_state
tp=0xffffa00001e9b800, ESTABLISHED -> CLOSE_WAIT
0xffff8000015c5040 netisr 0 1.273374815 tcp_state
tp=0xffffa00001e9bc00, FIN_WAIT_1 -> FIN_WAIT_2
0xffff80000205e040 /tests/tst-tcp- 0 1.273412034 tcp_state
tp=0xffffa00001e9b800, CLOSE_WAIT -> LAST_ACK
0xffff8000023fa040 >/tests/tst-tcp 0 1.280858240 tcp_state
tp=0xffffa00001e9b800, CLOSED -> CLOSED
Signed-off-by: Waldemar Kozaczuk <jwkozac...@gmail.com>
---
diff --git a/scripts/trace.py b/scripts/trace.py
--- a/scripts/trace.py
+++ b/scripts/trace.py
@@ -106,8 +106,11 @@ def get_backtrace_formatter(args):
def list_trace(args):
def data_formatter(sample):
- if args.tcpdump and is_net_packet_sample(sample):
- return format_packet_sample(sample)
+ if args.tcpdump:
+ if is_net_packet_sample(sample):
+ return format_packet_sample(sample)
+ if is_tcp_state_sample(sample):
+ return format_tcp_state_sample(sample)
return sample.format_data(sample)
def name_filter(sample):
@@ -368,9 +371,41 @@ def format_packet_sample(sample):
proc.wait()
return packet_line
+# See
http://tcpipguide.com/free/t_TCPOperationalOverviewandtheTCPFiniteStateMachineF-2.htm
+tcp_states = {
+ 0: 'CLOSED', # closed
+ 1: 'LISTEN', # listening for connection
+ 2: 'SYN_SENT', # active, have sent syn
+ 3: 'SYN_RECEIVED', # have sent and received syn
+# states < ESTABLISHED are those where connections not established
+ 4: 'ESTABLISHED', # established
+ 5: 'CLOSE_WAIT', # received fin, waiting for close
+# states > CLOSE_WAIT are those where user has closed
+ 6: 'FIN_WAIT_1', # have closed, sent fin
+ 7: 'CLOSING', # closed exchanged FIN; awaiting FIN ACK
+ 8: 'LAST_ACK', # had fin and close; awaiting FIN ACK
+# states > CLOSE_WAIT and < FIN_WAIT_2 await ACK of FIN
+ 9: 'FIN_WAIT_2', # have closed, fin is acked
+ 10: 'TIME_WAIT'
+}
+
+def format_tcp_state_sample(sample):
+ sample_str = sample.format_data(sample)
+ states = re.findall(".*(\d+) -> (\d+).*", sample_str)
+ if states == []:
+ return sample_str
+ else:
+ [(state_from, state_to)] = states
+ state_from_str = tcp_states.get(int(state_from))
+ state_to_str = tcp_states.get(int(state_to))
+ return "%s%s -> %s" % (sample_str[:-6], state_from_str or 'Unknown',
state_to_str or 'Unknown')
+
def is_net_packet_sample(sample):
return sample.name.startswith('net_packet_')
+def is_tcp_state_sample(sample):
+ return sample.name == "tcp_state"
+
def is_input_net_packet_sample(sample):
return sample.name == "net_packet_in"
--
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