net: Add FLOWI_FLAG_CAN_SLEEP.

And set is in contexts where the route resolution can sleep.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/flow.h
Simple merge

diff --cc include/net/route.h
Simple merge

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

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

diff --cc net/ipv6/ip6_output.c
Simple merge