[strongSwan-dev] [PATCH] fix network interface deletion handling

[Mirko Parthey]

Hi,
this patch is a followup to my most recent bug report on the users list:

When the kernel reports the deletion of an interface (RTM_DELLINK),
the cached interface attributes, including ifindex, become invalid
and must be forgotten.

Interface link state changes ("up" and "down") show up as RTM_NEWLINK,
so they will not cause a cached entry to be removed or
prevent listening to address change notifications.

Once an interface has been deleted, the kernel ought to stop sending
notifications for it. If the interface gets recreated with the same
name later, the kernel again reports RTM_NEWLINK, which causes a new
cache entry to be created.

There should be no reason to keep a stale cache entry around, as was
claimed in the comment.

Regards,
Mirko
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