[Bug 278654] The -ifa modifier to route(8) is ineffective

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 278654] The -ifa modifier to route(8) is ineffective"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 05 Aug 2025 16:37:09 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278654

--- Comment #5 from Alexandre Snarskii <snar@snar.spb.ru> ---
Created attachment 262723
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=262723&action=edit
patch

Looks like it was not that hard to fix. Proposed patch attached, based on
15-current, cleanly applies and shall work on 14 (not tested). 

Notes:
- when address provided with -ifa is not present in system, behavior is the
same as without netlink: this parameter is ignored.
- no attempts have been made to fix multipath routes: as far as I understand
route(8) sources it can't emit these anyway.
- used not NL_RTA_SRC but rather NL_RTA_PREFSRC netlink attribute.

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