[PATCH 2.5]: Use struct ip_esp_hdr from ip.h for ipt_esp.c

[Patrick McHardy <kaber@trash.net>]

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This patch makes ipt_esp.c use struct ip_esp_hdr from ip.h instead of
declaring its own. Since struct esphdr contained only the spi this patch
changes the logging behaviour slightly, packets with incomplete esp
headers will be logged as incomplete instead of having their spi logged
as long as they are > 4b.

Best regards,
Patrick

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# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
#	           ChangeSet	1.1537  -> 1.1538 
#	net/ipv4/netfilter/ipt_esp.c	1.6     -> 1.7    
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/07/21	kaber@trash.net	1.1538
# [NETFILTER]: Use common struct ip_esp_hdr declaration
# --------------------------------------------
#
--- a/net/ipv4/netfilter/ipt_esp.c	Thu May 22 01:35:36 2003
+++ b/net/ipv4/netfilter/ipt_esp.c	Mon Jul 21 02:46:04 2003
@@ -1,6 +1,7 @@
 /* Kernel module to match ESP parameters. */
 #include <linux/module.h>
 #include <linux/skbuff.h>
+#include <linux/ip.h>
 
 #include <linux/netfilter_ipv4/ipt_esp.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
@@ -13,10 +14,6 @@
 #define duprintf(format, args...)
 #endif
 
-struct esphdr {
-	__u32   spi;
-};
-
 /* Returns 1 if the spi is matched by the range, 0 otherwise */
 static inline int
 spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
@@ -37,7 +34,7 @@
       int offset,
       int *hotdrop)
 {
-	struct esphdr esp;
+	struct ip_esp_hdr esp;
 	const struct ipt_esp *espinfo = matchinfo;
 
 	/* Must not be a fragment. */