ipv6: record the reason for kernel-initiated route deletions

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Record why the kernel deletes an IPv6 route on its own:

- RT_DEL_REASON_EXPIRED for routes reaped by the FIB6 garbage
  collector after their RTF_EXPIRES lifetime ran out.
- RT_DEL_REASON_RA_WITHDRAWN for default routes, prefix routes and
  RFC 4191 route information routes withdrawn by a zero-lifetime
  Router Advertisement.

Deleting a default route because its metric changed is not a
withdrawal, so it keeps RT_DEL_REASON_UNSPEC.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260808005642.26901-4-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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This commit is contained in:

Yuyang Huang 2026-08-08 09:56:35 +09:00 • committed by Paolo Abeni

parent 352c6732ff

commit e8636445b7

4 changed files with 7 additions and 4 deletions

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3

net/ipv6/addrconf.c

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2

net/ipv6/ip6_fib.c

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4

net/ipv6/ndisc.c

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2

net/ipv6/route.c

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