selftests: net: packetdrill: add tests for advertised MSS with PMTU exceptions

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Add packetdrill tests for IPv4 and IPv6 to verify that the advertised
MSS in SYN-ACK is derived from the configured interface/route MTU,
and is not shrunk by learned Path MTU exceptions from previous
outbound connections.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://patch.msgid.link/20260815071532.301908-1-jiayuan.chen@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Eric Dumazet 2026-08-15 15:15:08 +08:00 • committed by Jakub Kicinski

parent 2640e64195

commit e5c8e301b4

2 changed files with 134 additions and 0 deletions

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tools/testing/selftests/net/packetdrill/tcp_advmss_pmtu_ipv4.pkt

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67

tools/testing/selftests/net/packetdrill/tcp_advmss_pmtu_ipv6.pkt

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