[IPV4]: RTA_{DST,SRC,GATEWAY,PREFSRC} annotated

these are passed net-endian; use be32 netlink accessors

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv4/fib_frontend.c
Simple merge

diff --cc net/ipv4/fib_semantics.c
Simple merge

diff --cc net/ipv4/route.c
Simple merge