ipv4: Add FLOWI_FLAG_KNOWN_NH
authorJulian Anastasov <ja@ssi.bg>
Mon, 8 Oct 2012 11:41:19 +0000 (11:41 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 28 Oct 2012 17:56:17 +0000 (10:56 -0700)
commit1f6cc51c46ed910f8f68d4f3359ad3bca7ee7bc2
treea2769c20faf6b009126e3eefd3baa4eaa3ed2a50
parent87a2496fa427fd98aafb6d4dcf263a9f35f2f49c
ipv4: Add FLOWI_FLAG_KNOWN_NH

[ Upstream commit c92b96553a80c1dbe2ebe128bbe37c8f98f148bf ]

Add flag to request that output route should be
returned with known rt_gateway, in case we want to use
it as nexthop for neighbour resolving.

The returned route can be cached as follows:

- in NH exception: because the cached routes are not shared
with other destinations
- in FIB NH: when using gateway because all destinations for
NH share same gateway

As last option, to return rt_gateway!=0 we have to
set DST_NOCACHE.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
include/net/flow.h
net/ipv4/route.c