netdev - [PATCH 3/8] net: introduce proto_ports

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Message-Id: <1282107824-3507-1-git-send-email-xiaosuo@gmail.com>
Date:	Wed, 18 Aug 2010 13:03:44 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Jamal Hadi Salim <hadi@...erus.ca>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, Changli Gao <xiaosuo@...il.com>
Subject: [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 <xiaosuo@...il.com>
---
 include/linux/in.h |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
diff --git a/include/linux/in.h b/include/linux/in.h
index 41d88a4..beeb6de 100644
--- a/include/linux/in.h
+++ b/include/linux/in.h
@@ -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);
--
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