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Commit e760702e authored by Changli Gao's avatar Changli Gao Committed by David S. Miller
Browse files

net: introduce proto_ports_offset() 



Introduce proto_ports_offset() for getting the position of the ports or
SPI in the message of a protocol.

Signed-off-by: default avatarChangli Gao <xiaosuo@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dbe5775b

include/linux/in.h

+19 −0
Original line number Diff line number Diff line
@@ -250,6 +250,25 @@ struct sockaddr_in { 


#ifdef __KERNEL__



#include <linux/errno.h>



static inline int proto_ports_offset(int proto)

{

	switch (proto) {

	case IPPROTO_TCP:

	case IPPROTO_UDP:

	case IPPROTO_DCCP:

	case IPPROTO_ESP:	/* SPI */

	case IPPROTO_SCTP:

	case IPPROTO_UDPLITE:

		return 0;

	case IPPROTO_AH:	/* SPI */

		return 4;

	default:

		return -EINVAL;

	}

}



static inline bool ipv4_is_loopback(__be32 addr)

{

	return (addr & htonl(0xff000000)) == htonl(0x7f000000);