diff --git a/src/platform/nm-linux-platform.c b/src/platform/nm-linux-platform.c
index 662f3d7046..1fc7cc3908 100644
--- a/src/platform/nm-linux-platform.c
+++ b/src/platform/nm-linux-platform.c
@@ -3431,6 +3431,18 @@ _new_from_nl_routing_rule (struct nlmsghdr *nlh, gboolean id_only)
 	nla_memcpy_checked_size (&props->sport_range, tb[FRA_SPORT_RANGE], sizeof (props->sport_range));
 	nla_memcpy_checked_size (&props->dport_range, tb[FRA_DPORT_RANGE], sizeof (props->dport_range));
 
+	if (!_nm_platform_kernel_support_detected (NM_PLATFORM_KERNEL_SUPPORT_TYPE_FRA_IP_PROTO)) {
+		/* support for FRA_IP_PROTO, FRA_SPORT_RANGE, and FRA_DPORT_RANGE was added together
+		 * by bfff4862653bb96001ab57c1edd6d03f48e5f035, kernel 4.17, 4 June 2018.
+		 *
+		 * Unfortunately, a missing attribute does not tell us anything about support.
+		 * We can only tell for sure when we have support, but not when we don't have.  */
+		if (   tb[FRA_IP_PROTO]
+		    || tb[FRA_SPORT_RANGE]
+		    || tb[FRA_DPORT_RANGE])
+			_nm_platform_kernel_support_init (NM_PLATFORM_KERNEL_SUPPORT_TYPE_FRA_IP_PROTO, 1);
+	}
+
 	G_STATIC_ASSERT_EXPR (sizeof (NMFibRuleUidRange) == 8);
 	G_STATIC_ASSERT_EXPR (G_STRUCT_OFFSET (NMFibRuleUidRange, start) == 0);
 	G_STATIC_ASSERT_EXPR (G_STRUCT_OFFSET (NMFibRuleUidRange, end) == 4);
diff --git a/src/platform/nm-platform.c b/src/platform/nm-platform.c
index b5636d60d5..f16e7aec2a 100644
--- a/src/platform/nm-platform.c
+++ b/src/platform/nm-platform.c
@@ -301,6 +301,11 @@ static const struct {
 		.name                 = "FRA_PROTOCOL",
 		.desc                 = "FRA_PROTOCOL attribute for policy routing rules",
 	},
+	[NM_PLATFORM_KERNEL_SUPPORT_TYPE_FRA_IP_PROTO] = {
+		.compile_time_default = (FRA_MAX >= 22 /* FRA_IP_PROTO */),
+		.name                 = "FRA_IP_PROTO",
+		.desc                 = "FRA_IP_PROTO, FRA_SPORT_RANGE, FRA_DPORT_RANGE attributes for policy routing rules",
+	},
 };
 
 int
diff --git a/src/platform/nm-platform.h b/src/platform/nm-platform.h
index 1d5b18402a..639fe5a51f 100644
--- a/src/platform/nm-platform.h
+++ b/src/platform/nm-platform.h
@@ -849,6 +849,11 @@ typedef enum {
 	NM_PLATFORM_KERNEL_SUPPORT_TYPE_USER_IPV6LL,
 	NM_PLATFORM_KERNEL_SUPPORT_TYPE_RTA_PREF,
 	NM_PLATFORM_KERNEL_SUPPORT_TYPE_FRA_PROTOCOL,
+
+	/* this also includes FRA_SPORT_RANGE and FRA_DPORT_RANGE which
+	 * were added at the same time. */
+	NM_PLATFORM_KERNEL_SUPPORT_TYPE_FRA_IP_PROTO,
+
 	_NM_PLATFORM_KERNEL_SUPPORT_NUM,
 } NMPlatformKernelSupportType;