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net: introduce proto_ports_offset()

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

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Changli Gao 2010-08-17 19:03:44 +00:00 committed by David S. Miller
parent dbe5775bbc
commit e760702ed8
1 changed files with 19 additions and 0 deletions
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19
include/linux/in.h
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@ -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);