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435f90a338
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>
19 lines
273 B
C
19 lines
273 B
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef _TEST_TCPBPF_H
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#define _TEST_TCPBPF_H
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struct tcpnotify_globals {
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__u32 total_retrans;
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__u32 ncalls;
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};
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struct tcp_notifier {
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__u8 type;
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__u8 subtype;
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__u8 source;
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__u8 hash;
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};
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#define TESTPORT 12877
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#endif
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