On 7/31/24 14:07, Stanislav Fomichev wrote:
On 07/31, Kui-Feng Lee wrote:
Add functions that capture packets and print log in the background. They
are supposed to be used for debugging flaky network test cases. A monitored
test case should call traffic_monitor_start() to start a thread to capture
packets in the background for a given namespace and call
traffic_monitor_stop() to stop capturing. (Or, option '-m' implemented by
the later patches.)
IPv4 TCP packet: 127.0.0.1:48165 -> 127.0.0.1:36707, len 68, ifindex 1, SYN
IPv4 TCP packet: 127.0.0.1:36707 -> 127.0.0.1:48165, len 60, ifindex 1, SYN, ACK
IPv4 TCP packet: 127.0.0.1:48165 -> 127.0.0.1:36707, len 60, ifindex 1, ACK
IPv4 TCP packet: 127.0.0.1:36707 -> 127.0.0.1:48165, len 52, ifindex 1, ACK
IPv4 TCP packet: 127.0.0.1:48165 -> 127.0.0.1:36707, len 52, ifindex 1, FIN, ACK
IPv4 TCP packet: 127.0.0.1:36707 -> 127.0.0.1:48165, len 52, ifindex 1, RST, ACK
Packet file: packets-2172-86-select_reuseport:sockhash-test.log
#280/87 select_reuseport/sockhash IPv4/TCP LOOPBACK test_detach_bpf:OK
The above is the output of an example. It shows the packets of a connection
and the name of the file that contains captured packets in the directory
/tmp/tmon_pcap. The file can be loaded by tcpdump or wireshark.
This feature only works if TRAFFIC_MONITOR variable has been passed to
build BPF selftests. For example,
make TRAFFIC_MONITOR=1 -C tools/testing/selftests/bpf
This command will build BPF selftests with this feature enabled.
Signed-off-by: Kui-Feng Lee <thinker.li@xxxxxxxxx>
---
tools/testing/selftests/bpf/Makefile | 5 +
tools/testing/selftests/bpf/test_progs.c | 432 +++++++++++++++++++++++
tools/testing/selftests/bpf/test_progs.h | 16 +
3 files changed, 453 insertions(+)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 774c6270e377..0a3108311be7 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -41,6 +41,11 @@ CFLAGS += -g $(OPT_FLAGS) -rdynamic \
LDFLAGS += $(SAN_LDFLAGS)
LDLIBS += $(LIBELF_LIBS) -lz -lrt -lpthread
+ifneq ($(TRAFFIC_MONITOR),)
+LDLIBS += -lpcap
+CFLAGS += -DTRAFFIC_MONITOR=1
+endif
Optionally: can make this more automagical with the following:
LDLIBS += $(shell pkg-config --libs 2>/dev/null)
CFLAGS += $(shell pkg-config --cflags 2>/dev/null)
CFLAGS += $(shell pkg-config --exists libpcap 2>/dev/null && echo "-DTRAFFIC_MONITOR=1")
Sure! I will try it!
