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Move the IP_CMSG_* constants from ip_sockglue.c to inet_sock.h so that they can be referenced in other source files. Restructure ip_cmsg_recv to not go through flags using shift, check for flags by 'and'. This eliminates both the shift and a conditional per flag check. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>