diff --git a/kmod_utils.c b/kmod_utils.c
index 2884e9a..68b244d 100644
--- a/kmod_utils.c
+++ b/kmod_utils.c
@@ -65,16 +65,8 @@ static int send_raw_ipv4(const uint8_t *pkt, uint32_t pktlen) {
 
 	memset(&msg, 0, sizeof(msg));
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
 	iov.iov_base = (__u8 *)pkt;
 	iov.iov_len = pktlen;
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, 1);
-#else
-	iov.iov_base = (__u8 *)pkt;
-	iov.iov_len = pktlen;
-	// msg.msg_iov = (struct iovec *)&iov;
-	// msg.msg_iovlen = iov.iov_len;
-#endif
 
 	msg.msg_flags = 0;
 	msg.msg_name = &daddr;
@@ -133,16 +125,8 @@ int send_raw_ipv6(const uint8_t *pkt, uint32_t pktlen) {
 	struct msghdr msg;
 	memset(&msg, 0, sizeof(msg));
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
 	iov.iov_base = (__u8 *)pkt;
 	iov.iov_len = pktlen;
-	iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, 1);
-#else
-	iov.iov_base = (__u8 *)pkt;
-	iov.iov_len = pktlen;
-	// msg.msg_iov = (struct iovec *)&iov;
-	// msg.msg_iovlen = iov.iov_len;
-#endif
 
 	msg.msg_flags = 0;
 	msg.msg_name = &daddr;
diff --git a/mangle.c b/mangle.c
index c0918e5..3265f7d 100644
--- a/mangle.c
+++ b/mangle.c
@@ -1037,7 +1037,12 @@ int fail_packet(uint8_t *payload, uint32_t *plen, uint32_t avail_buflen) {
 				return -1;
 			}
 			uint8_t *ndata = data + delta;
-			memcpy(ndata, data, dlen);
+			uint8_t *ndptr = ndata + dlen;
+			uint8_t *dptr = data + dlen;
+			for (size_t i = dlen + 1; i > 0; i--) {
+				*ndptr = *dptr;
+				--ndptr, --dptr;
+			}
 			data = ndata;
 			tcph_len = tcph_len + delta;
 			tcph->doff = tcph_len >> 2;
diff --git a/types.h b/types.h
index 81b3b8e..777601d 100644
--- a/types.h
+++ b/types.h
@@ -93,7 +93,7 @@ typedef __u64 	uint64_t;
  */
 #ifdef KERNEL_SPACE
 #include <linux/gfp.h>
-#define NETBUF_ALLOC(buf, buf_len) __u8* buf = kmalloc(buf_len, GFP_ATOMIC);
+#define NETBUF_ALLOC(buf, buf_len) __u8* buf = kmalloc(buf_len, GFP_KERNEL);
 #define NETBUF_CHECK(buf) ((buf) != NULL)
 #define NETBUF_FREE(buf) kfree(buf);
 #elif defined(ALLOC_MALLOC)