#! /bin/sh -e
## 
## All lines beginning with `## DP:' are a description of the patch.
## DP: Fixes the u32 calculation for 2.6 kernel - by Russell Stuart <russell-debian@stuart.id.au> 

[ -f debian/patches/00patch-opts ] && . debian/patches/00patch-opts
patch_opts="${patch_opts:--f --no-backup-if-mismatch}"

if [ $# -ne 1 ]; then
    echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
    exit 1
fi
case "$1" in
       -patch) patch $patch_opts -p1 < $0;;
       -unpatch) patch $patch_opts -p1 -R < $0;;
        *)
                echo >&2 "`basename $0`: script expects -patch|-unpatch as argument"
                exit 1;;
esac

exit 0
@DPATCH@
diff -Nur iproute-20051007.keep/tc/f_u32.c iproute-20051007/tc/f_u32.c
--- iproute-20051007.keep/tc/f_u32.c	2006-01-12 17:34:37.000000000 +1000
+++ iproute-20051007/tc/f_u32.c	2006-02-07 17:10:29.000000000 +1000
@@ -17,6 +17,7 @@
 #include <syslog.h>
 #include <fcntl.h>
 #include <sys/socket.h>
+#include <sys/utsname.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <string.h>
@@ -874,6 +875,7 @@
 				htid = (handle&0xFFFFF000);
 		} else if (strcmp(*argv, "sample") == 0) {
 			__u32 hash;
+			struct utsname utsname;
 			struct {
 				struct tc_u32_sel sel;
 				struct tc_u32_key keys[4];
@@ -889,8 +891,19 @@
 				return -1;
 			}
 			hash = sel2.sel.keys[0].val&sel2.sel.keys[0].mask;
-			hash ^= hash>>16;
-			hash ^= hash>>8;
+			uname(&utsname);
+			if (strncmp(utsname.release, "2.4.", 4) == 0) {
+				hash ^= hash>>16;
+				hash ^= hash>>8;
+			}
+			else {
+				__u32 mask = sel2.sel.keys[0].mask;
+				while (mask && !(mask & 1)) {
+				  	mask >>= 1;
+					hash >>= 1;
+				}
+				hash &= 0xFF;
+			}
 			htid = ((hash<<12)&0xFF000)|(htid&0xFFF00000);
 			sample_ok = 1;
 			continue;