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selftests: net: test untracked NA recovery of FAILED neighbors

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Seed a FAILED neighbor before triggering an unsolicited NA. Verify that
the entry transitions to STALE and learns the advertised link-layer
address only when drop_unsolicited_na is disabled, accept_untracked_na
mode 1 or in-prefix mode 2 is enabled, and IPv6 forwarding is enabled.
Verify that disabling each gate keeps the entry in FAILED without a
link-layer address.

Mark the seed externally learned and disable carrier-based eviction so
the entry cannot be garbage-collected before the NA arrives. Require the
marker after processing to prove that a recovered entry was updated in
place instead of deleted and recreated.

Keep the NA source, target, and neighbor key fixed for the mode 2 cases.
Vary the prefix configured on the router to exercise the source-prefix
check without changing the entry under test.

Arm packet capture before bringing up the host interface and starting
DAD. Wait for the capture to become ready and for tcpdump to exit so the
NA cannot be missed and receive processing is complete before checking
the neighbor entry.

Preserve the return code from test_unsolicited_na_common() before
constructing the test description. The array assignment previously reset
the return code to zero and caused existing cases to report false success.

Link: https://lore.kernel.org/r/20260813233344.445265-1-lfqlee314@gmail.com
Signed-off-by: Lawrence Lee <lfqlee314@gmail.com>
Link: https://patch.msgid.link/ce40008682ed26ab039168a5fcb515eff8d30c3a.1790127207.git.lfqlee314@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lawrence Lee 2026-09-23 01:34:19 +00:00 • committed by Jakub Kicinski
commit 022e48e207
1 changed files with 160 additions and 35 deletions
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