diff --git a/sys/compat/linuxkpi/common/include/linux/kernel.h b/sys/compat/linuxkpi/common/include/linux/kernel.h
--- a/sys/compat/linuxkpi/common/include/linux/kernel.h
+++ b/sys/compat/linuxkpi/common/include/linux/kernel.h
@@ -543,6 +543,21 @@
 	return (kstrtouint(buf, base, p));
 }
 
+static inline int
+kstrtou32_from_user(const char __user *s, size_t count, unsigned int base,
+    uint32_t *p)
+{
+	char buf[36] = {};
+
+	if (count > (sizeof(buf) - 1))
+		count = (sizeof(buf) - 1);
+
+	if (copy_from_user(buf, s, count))
+		return (-EFAULT);
+
+	return (kstrtou32(buf, base, p));
+}
+
 static inline int
 kstrtou8_from_user(const char __user *s, size_t count, unsigned int base,
     u8 *p)
@@ -716,6 +731,45 @@
 	return (0);
 }
 
+static inline bool
+mac_pton(const char *macin, uint8_t *macout)
+{
+	const char *s, *d;
+	uint8_t mac[6], hx, lx;;
+	int i;
+
+	if (strlen(macin) < (3 * 6 - 1))
+		return (false);
+
+	i = 0;
+	s = macin;
+	do {
+		/* Should we also support '-'-delimiters? */
+		d = strchrnul(s, ':');
+		hx = lx = 0;
+		while (s < d) {
+			/* We do support non-well-formed strings: 3:45:6:... */
+			if ((d - s) > 1) {
+				hx = _h2b(*s);
+				if (hx < 0)
+					return (false);
+				s++;
+			}
+			lx = _h2b(*s);
+			if (lx < 0)
+				return (false);
+			s++;
+		}
+		mac[i] = (hx << 4) | lx;
+		i++;
+		if (i >= 6)
+			return (false);
+	} while (d != NULL && *d != '\0');
+
+	memcpy(macout, mac, 6);
+	return (true);
+}
+
 #define	DECLARE_FLEX_ARRAY(_t, _n)					\
     struct { struct { } __dummy_ ## _n; _t _n[0]; }