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selftests: net: add test for ipv6 fragmentation

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Add selftest for the IPv6 fragmentation regression which affected
several stable kernels.

Commit a18dfa9925 ("ipv6: save dontfrag in cork") was backported to
stable without some prerequisite commits.  This caused a regression when
sending IPv6 UDP packets by preventing fragmentation and instead
returning -1 (EMSGSIZE).

Add selftest to check for this issue by attempting to send a packet
larger than the interface MTU. The packet will be fragmented on a
working kernel, with sendmsg(2) correctly returning the expected number
of bytes sent.  When the regression is present, sendmsg returns -1 and
sets errno to EMSGSIZE.

Link: https://lore.kernel.org/stable/aElivdUXqd1OqgMY@karahi.gladserv.com
Signed-off-by: Brett A C Sheffield <bacs@librecast.net>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250903154925.13481-1-bacs@librecast.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Brett A C Sheffield
2025-09-03 15:46:01 +00:00
committed by Paolo Abeni
parent d67ca09ca3
commit aeb8d48ea9
3 changed files with 116 additions and 0 deletions
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1
tools/testing/selftests/net/Makefile
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@@ -118,6 +118,7 @@ TEST_GEN_FILES += tfo
TEST_PROGS += tfo_passive.sh
TEST_PROGS += broadcast_pmtu.sh
TEST_PROGS += ipv6_force_forwarding.sh
TEST_GEN_PROGS += ipv6_fragmentation
TEST_PROGS += route_hint.sh
# YNL files, must be before "include ..lib.mk"