selftests/net: expand cmsg_ipv6.sh with ipv4

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Expand IPV6_TCLASS to also cover IP_TOS.
Expand IPV6_HOPLIMIT to also cover IP_TTL.

Expand csmg_sender.c to allow setting IPv4 setsockopts.
Also rename struct v6 to cmsg to match its expanded scope.
Don't bother updating all occurrences of tclass and hoplimit.

Rename cmsg_ipv6.sh to cmsg_ip.sh to match the expanded scope.

Be careful around the subtle API difference between TCLASS and TOS.
IP_TOS includes ECN bits. Add a test to verify that these are masked
when making routing decisions.

Diff is more concise with --word-diff

Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250225022431.2083926-3-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Willem de Bruijn 2025-02-24 21:23:59 -05:00 • committed by Jakub Kicinski

parent c1d6d629ab

commit 2e5584e0f9

4 changed files with 240 additions and 199 deletions

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2

tools/testing/selftests/net/Makefile

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59

tools/testing/selftests/net/cmsg_ipv6.sh → tools/testing/selftests/net/cmsg_ip.sh

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90

tools/testing/selftests/net/cmsg_sender.c

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