net: ipv6: Dont add RT6_LOOKUP_F_IFACE flag if saddr set
authorDavid Ahern <dsa@cumulusnetworks.com>
Wed, 21 Oct 2015 15:42:22 +0000 (08:42 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 22 Oct 2015 14:36:19 +0000 (07:36 -0700)
commitd46a9d678e4c9fac1e968d0593e4dba683389324
tree24b84e5a7b51f6c7687993a7951c44661b16fa4b
parent92a93fd5bbe7dbe0ee7322c92e44a820f62bef90
net: ipv6: Dont add RT6_LOOKUP_F_IFACE flag if saddr set

741a11d9e410 ("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: 741a11d9e410 ("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>
net/ipv6/route.c