kernel/tools/testing/selftests/bpf/test_tcpnotify.h, branch linux-6.2.yHosts the 0x221E linux distro kernel.https://universe.0xinfinity.dev/distro/kernel/atom?h=linux-6.2.y2018-11-09T08:40:17Zselftests/bpf: add a test case for sock_ops perf-event notification2018-11-09T08:40:17ZSowmini Varadhansowmini.varadhan@oracle.com2018-11-08T00:12:02Zurn:sha1:435f90a338ae42c0d7c0109a1742d1b16bc99bf6
This patch provides a tcp_bpf based eBPF sample. The test
- ncat(1) as the TCP client program to connect() to a port
with the intention of triggerring SYN retransmissions: we
first install an iptables DROP rule to make sure ncat SYNs are
resent (instead of aborting instantly after a TCP RST)
- has a bpf kernel module that sends a perf-event notification for
each TCP retransmit, and also tracks the number of such notifications
sent in the global_map
The test passes when the number of event notifications intercepted
in user-space matches the value in the global_map.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>