diff --git a/compat.h b/compat.h
index 8461c3d..dffc9e3 100644
--- a/compat.h
+++ b/compat.h
@@ -746,9 +746,10 @@ unsigned long long strtoul(const char *cp, char **endp, unsigned int base)
 	return result;
 }
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,12,0)
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,12,0)) \
+    || ((LINUX_VERSION_CODE >= KERNEL_VERSION(5,10,220)) && (LINUX_VERSION_CODE < KERNEL_VERSION(5,11,0)))
 /*
- * find_module() is unexported in v5.12:
+ * find_module() is unexported in v5.12 (backported to 5.10.220):
  *   089049f6c9956 ("module: unexport find_module and module_mutex")
  * and module_mutex is replaced with RCU in
  *   a006050575745 ("module: use RCU to synchronize find_module")
@@ -773,13 +774,14 @@ struct module *find_module(const char *name)
 
 /* Copy from 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' pseudo
  * keyword for switch/case use") */
-#ifndef fallthrough
-# if defined __has_attribute && __has_attribute(__fallthrough__)
+#if !defined(fallthrough) && defined(__has_attribute)
+# if __has_attribute(__fallthrough__)
 #  define fallthrough			__attribute__((__fallthrough__))
-# else
-#  define fallthrough			do {} while (0)  /* fallthrough */
 # endif
 #endif
+#ifndef fallthrough
+#  define fallthrough			do {} while (0)  /* fallthrough */
+#endif
 
 #ifndef HAVE_NF_CT_EVENT_NOTIFIER_CT_EVENT
 /*
diff --git a/configure b/configure
index 66ced00..ae8a579 100755
--- a/configure
+++ b/configure
@@ -6,6 +6,7 @@ PATH=$PATH:/bin:/usr/bin:/usr/sbin:/sbin:/usr/local/sbin
 case "$1" in
   --from-dkms-conf*)
     KDKMS=`echo "$1" | sed 's/[^=]*.//'`
+    KDIR="$KDKMS"
     # restore options from existing Makefile, if present
     if [ -e Makefile ]; then
       set -- `sed -n 's/^CARGS = \(.*\)/\1/p' Makefile`
@@ -348,7 +349,7 @@ do
     --disable-snmp-a*)   SKIPSNMP=1 ;;
     --disable-net-snmp*) SKIPSNMP=1 ;;
     --disable-dkms*)     SKIPDKMS=1 ;;
-    --from-dkms-conf*) ;;
+    --from-dkms-conf*)   SKIPDKMS=1 ;;
     --make) echo called from make; CARGS=`echo $CARGS | sed s/--make//g` ;;
     -Werror) KOPTS="$KOPTS -Werror" ;;
     --help|-h) show_help ;;
@@ -614,7 +615,7 @@ dkms_check() {
   echo Yes.
   DKMSINSTALL=dinstall
   test "$FROMDKMSCONF" && return
-  if dkms status | grep ^ipt-netflow, >/dev/null; then
+  if dkms status ipt-netflow | grep ^ipt-netflow/ >/dev/null; then
     echo "! You are already have module installed via DKMS"
     echo "!   it will be uninstalled on 'make install' and"
     echo "!   current version of module installed afterwards."
diff --git a/dkms.conf b/dkms.conf
index 808e158..7968b38 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -2,6 +2,10 @@ PACKAGE_NAME="ipt-netflow"
 pushd `dirname $BASH_SOURCE`
 PACKAGE_VERSION=`./version.sh`
 popd
+
+# skb_reset_mac_len() was introduced in v3.0-rc3
+BUILD_EXCLUSIVE_KERNEL_MIN="3"
+
 BUILT_MODULE_NAME[0]=ipt_NETFLOW
 DEST_MODULE_LOCATION[0]=/kernel/extra
 STRIP[0]=no
diff --git a/gen_compat_def b/gen_compat_def
index a9cb95e..e9d4e76 100755
--- a/gen_compat_def
+++ b/gen_compat_def
@@ -64,7 +64,7 @@ kbuild_test_symbol() {
   echo -n "Test function $* " >&2
   kbuild_test_compile ${1^^} $1 ${2-} <<-EOF
 	#include <linux/module.h>
-	${2:+#include <$2>}
+	${3:-${2:+#include <$2>}}
 	MODULE_LICENSE("GPL");
 	void *test = $1;
 	EOF
@@ -121,7 +121,12 @@ kbuild_test_symbol nf_bridge_info_get linux/netfilter_bridge.h
 # Stumbled on 5.9
 kbuild_test_struct vlan_dev_priv linux/if_vlan.h
 # Kernel version check broken by centos8
-kbuild_test_symbol put_unaligned_be24 asm/unaligned.h
+kbuild_test_symbol put_unaligned_be24 '???/unaligned.h' '#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,12,0)
+#include <linux/unaligned.h>
+#else
+#include <asm/unaligned.h>
+#endif'
 # totalram_pages changed from atomic to inline function.
 kbuild_test_symbol totalram_pages linux/mm.h
 kbuild_test_ref    totalram_pages linux/mm.h
diff --git a/ipt_NETFLOW.c b/ipt_NETFLOW.c
index eee8074..bbd2c9b 100644
--- a/ipt_NETFLOW.c
+++ b/ipt_NETFLOW.c
@@ -68,12 +68,17 @@
 # include <net/netfilter/nf_conntrack_core.h>
 #endif
 #include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6,12,0)
+#include <linux/unaligned.h>
+#else
 #include <asm/unaligned.h>
+#endif
 #ifdef HAVE_LLIST
 	/* llist.h is officially defined since linux 3.1,
 	 * but centos6 have it backported on its 2.6.32.el6 */
 # include <linux/llist.h>
 #endif
+#include <linux/ratelimit.h>
 #include "compat.h"
 #include "ipt_NETFLOW.h"
 #include "murmur3.h"
@@ -4881,6 +4886,8 @@ static void parse_l2_header(const struct sk_buff *skb, struct ipt_netflow_tuple
 		    && !(vlan->flags & VLAN_FLAG_REORDER_HDR)
 #  if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
 		    && !netif_is_macvlan_port(vlan_dev)
+#  endif
+#  if LINUX_VERSION_CODE >= KERNEL_VERSION(4,4,0)
 		    && !netif_is_bridge_port(vlan_dev)
 #  endif
 		   ))