--- ./kernel/tcp_splice_xmit.c.orig	Wed Jan  3 22:43:03 2007
+++ ./kernel/tcp_splice_xmit.c	Wed Jan  3 22:54:31 2007
@@ -18,6 +18,7 @@
  * Copyright (C) 2006 Alexandre Cassen, <acassen@linux-l7sw.org>
  */
 
+#include <linux/version.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/ip.h>
@@ -358,7 +359,11 @@
 	/* Add incremental checksum update later? */
 	/* full checksum check here now */
 	if (skb_is_nonlinear(skb)) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+		if (skb_linearize(skb, GFP_ATOMIC) != 0)
+#else
 		if (skb_linearize(skb) != 0)
+#endif
 			return NF_DROP;
 		iph = skb->nh.iph;
 		th = (void *)iph + ihl;
@@ -366,7 +371,15 @@
 	switch (skb->ip_summed) {
 	case CHECKSUM_NONE:
 		skb->csum = csum_partial((void *)th, datalen, 0);
+#if defined(CHECKSUM_COMPLETE)
+	/* kernel 2.6.19+ */
 	case CHECKSUM_COMPLETE:
+#elif defined(CHECKSUM_HW)
+	/* kernel <2.6.19 */
+	case CHECKSUM_HW:
+#else
+#error "Neither CHECKSUM_COMPLETE nor CHECKSUM_HW are defined. Check your kernel headers !"
+#endif
 		if (csum_tcpudp_magic(iph->saddr, iph->daddr,
 				      datalen, IPPROTO_TCP, skb->csum)) {
 			TCP_SPLICE_DBG_RL("Incoming failed checksum "