fwd_rule: Don't attempt dual stack listen()s if only one IP family

With the recent rework to forwarding configuration, we're stricter about
what forwarding rules we allow.  In particular we don't allow dual stack
forwards (listening on both IPv4 and IPv6 addresses) if we only have one
IP family enabled.

This makes what I think was a pre-existing minor bug into a nasty failure.
If we use default forwards with no address specified, e.g.:
    $ pasta -t 1234 -4
    $ pasta -U 4321 -6
these are interpreted as dual-stack forwards.  Previously these would be
applied, leading to a surprising dual stack socket.  Since 0aeda87ca185,
they instead result in an immediate fatal error.

Add logic to interpret a default "any" address as only one IP family if
only one IP family is enabled.

Link: https://bugs.passt.top/show_bug.cgi?id=205
Reported-by: <j.d03@cpc.cx>
Fixes: 0aeda87ca185 ("conf, fwd: Stricter rule checking in fwd_rule_add()")
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

0 files changed, 0 insertions, 0 deletions