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net: ipv6: Dont add RT6_LOOKUP_F_IFACE flag if saddr set
741a11d ("net: ipv6: Add RT6_LOOKUP_F_IFACE flag if oif is set") adds the RT6_LOOKUP_F_IFACE flag to make device index mismatch fatal if oif is given. Hajime reported that this change breaks the Mobile IPv6 use case that wants to force the message through one interface yet use the source address from another interface. Handle this case by only adding the flag if oif is set and saddr is not set. Fixes: 741a11d ("net: ipv6: Add RT6_LOOKUP_F_IFACE flag if oif is set") Cc: Hajime Tazaki <thehajime@gmail.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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