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net: introduce proto_ports_offset()

PATCH Applied Changli Gao 2 participants 2 messages Aug 18, 2010 – Aug 20, 2010

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Changli Gao

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PATCH 3/8 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 Changli Gao <[email protected]>
---
 include/linux/in.h |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
include/linux/in.h +19 -0
index 41d88a4..beeb6de 100644
@@ -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);