diff --git a/Makefile b/Makefile
index e4907c9..a75d52c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
-# Comment/uncomment the following line to disable/enable debugging
+
 DEBUG = n
 ONE_PIPE = n
 IPC = 0 # 0 == netlink, 1 == chardev
 
 # Add your debugging flag (or not) to EXTRA_CFLAGS
 ifeq ($(DEBUG),y)
-  DEBFLAGS = -O1 -g -D__DEBUG__ # "-O" is needed to expand inlines
+  DEBFLAGS = -O1 -g -D__DEBUG__ -D__LOG_DEBUG__ # "-O" is needed to expand inlines
 else
   DEBFLAGS = -Ofast
 endif
@@ -28,9 +28,11 @@ ccp-objs := libccp/serialize.o libccp/ccp_priv.o libccp/machine.o libccp/ccp.o c
 obj-m := $(TARGET).o
 
 all:
-ifneq ($(KERNEL_VERSION_MAJOR),4)
-	$(error "Only kernel version 4 is supported: $(KERNEL_VERSION_MAJOR) $(KERNEL_VERSION_MINOR)")
+ifneq ($(shell expr $(KERNEL_VERSION_MAJOR) \>= 4),1)
+	$(error "Only kernel version >= 4 is supported: $(KERNEL_VERSION_MAJOR) $(KERNEL_VERSION_MINOR)")
 endif 
+ifeq ($(shell expr $(KERNEL_VERSION_MINOR) \>= 4),1)
+endif
 	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(CURDIR) modules
 
 clean:
diff --git a/libccp b/libccp
index f22d594..befa999 160000
--- a/libccp
+++ b/libccp
@@ -1 +1 @@
-Subproject commit f22d594139243bf1bbf4084801fdafb63700293f
+Subproject commit befa99968633f77830ac55cd0709040abf1ae342
diff --git a/tcp_ccp.c b/tcp_ccp.c
index bd3fd8f..d4917a8 100644
--- a/tcp_ccp.c
+++ b/tcp_ccp.c
@@ -1,7 +1,7 @@
 #include "tcp_ccp.h"
 #include "libccp/ccp.h"
 
-#if __KERNEL_VERSION_MINOR__ <= 16 && __KERNEL_VERSION_MINOR__ >= 13
+#if __KERNEL_VERSION_MINOR__ <= 14 && __KERNEL_VERSION_MINOR__ >= 13
 #define COMPAT_MODE
 #elif __KERNEL_VERSION_MINOR__ >= 19
 #define RATESAMPLE_MODE
@@ -71,21 +71,6 @@ static void do_set_rate_abs(
     ccp_set_pacing_rate(sk, rate);
 }
 
-static void do_set_rate_rel(
-    struct ccp_datapath *dp,
-    struct ccp_connection *conn, 
-    uint32_t factor
-) {
-    struct sock *sk;
-    uint64_t newrate;
-    get_sock_from_ccp(&sk, conn);
-
-    // factor is * 100
-    newrate = sk->sk_pacing_rate * factor;
-    do_div(newrate, 100);
-    ccp_set_pacing_rate(sk, newrate);
-}
-
 struct timespec64 tzero;
 static u64 ccp_now(void) {
     struct timespec64 now, diff;
@@ -183,6 +168,7 @@ int load_primitives(struct sock *sk, const struct rate_sample *rs) {
 #ifdef COMPAT_MODE
     // receive rate
     ack_us = tcp_stamp_us_delta(tp->tcp_mstamp, rs->prior_mstamp);
+
     // send rate
     for (i=0; i < MAX_SKB_STORED; i++) {
         if (ca->skb_array[i].first_tx_mstamp == tp->first_tx_mstamp) {
@@ -202,7 +188,6 @@ int load_primitives(struct sock *sk, const struct rate_sample *rs) {
         do_div(rout, ack_us);
     }
 
-
     mmt->bytes_acked = tp->bytes_acked - ca->last_bytes_acked;
     ca->last_bytes_acked = tp->bytes_acked;
 
@@ -226,6 +211,7 @@ int load_primitives(struct sock *sk, const struct rate_sample *rs) {
     if ( rout != 0 ) {
         mmt->rate_incoming = rout;
     }
+
     mmt->bytes_in_flight = tcp_packets_in_flight(tp) * tp->mss_cache;
     mmt->packets_in_flight = tcp_packets_in_flight(tp);
     if (tp->snd_cwnd <= 0) {
@@ -348,7 +334,7 @@ void tcp_ccp_init(struct sock *sk) {
     cpl->last_bytes_acked = tp->bytes_acked;
     cpl->last_sacked_out = tp->sacked_out;
 
-    cpl->skb_array = (struct skb_info*)__MALLOC__(MAX_SKB_STORED * sizeof(struct skb_info));
+    cpl->skb_array = (struct skb_info*)kmalloc(MAX_SKB_STORED * sizeof(struct skb_info), GFP_KERNEL);
     if (!(cpl->skb_array)) {
         pr_info("ccp: could not allocate skb array\n");
     }
@@ -405,7 +391,6 @@ static int __init tcp_ccp_register(void) {
     struct ccp_datapath dp = {
         .set_cwnd = &do_set_cwnd,
         .set_rate_abs = &do_set_rate_abs,
-        .set_rate_rel = &do_set_rate_rel,
         .now = &ccp_now,
         .since_usecs = &ccp_since,
         .after_usecs = &ccp_after