diff --git a/ip/link_gre.c b/ip/link_gre.c
index 2ae2194..b70f73b 100644
--- a/ip/link_gre.c
+++ b/ip/link_gre.c
@@ -491,50 +491,38 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 		}
 
 		if (is_json_context()) {
-			print_uint(PRINT_JSON,
-				   "sport",
-				   NULL,
-				   sport ? ntohs(sport) : 0);
+			print_uint(PRINT_JSON, "sport", NULL, ntohs(sport));
 			print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
-
-			print_bool(PRINT_JSON,
-				   "csum",
-				   NULL,
+			print_bool(PRINT_JSON, "csum", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_CSUM);
-
-			print_bool(PRINT_JSON,
-				   "csum6",
-				   NULL,
+			print_bool(PRINT_JSON, "csum6", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_CSUM6);
-
-			print_bool(PRINT_JSON,
-				   "remcsum",
-				   NULL,
+			print_bool(PRINT_JSON, "remcsum", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
 
 			close_json_object();
 		} else {
-			if (sport == 0)
-				fputs("encap-sport auto ", f);
-			else
-				fprintf(f, "encap-sport %u", ntohs(sport));
+			int t;
 
-			fprintf(f, "encap-dport %u ", ntohs(dport));
+			t = sport ? ntohs(sport) + 1 : 0;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("sport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM)
-				fputs("encap-csum ", f);
-			else
-				fputs("noencap-csum ", f);
+			t = ntohs(dport) + 1;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("dport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
-				fputs("encap-csum6 ", f);
-			else
-				fputs("noencap-csum6 ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum", t, -1));
 
-			if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
-				fputs("encap-remcsum ", f);
-			else
-				fputs("noencap-remcsum ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM6;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum6", t, -1));
+
+			t = flags & TUNNEL_ENCAP_FLAG_REMCSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("remcsum", t, -1));
 		}
 	}
 }
diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index 9576354..41180bb 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -538,40 +538,38 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 		}
 
 		if (is_json_context()) {
-			print_uint(PRINT_JSON,
-				   "sport",
-				   NULL,
-				   sport ? ntohs(sport) : 0);
+			print_uint(PRINT_JSON, "sport", NULL, ntohs(sport));
 			print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
 			print_bool(PRINT_JSON, "csum", NULL,
-					   flags & TUNNEL_ENCAP_FLAG_CSUM);
+				   flags & TUNNEL_ENCAP_FLAG_CSUM);
 			print_bool(PRINT_JSON, "csum6", NULL,
-					   flags & TUNNEL_ENCAP_FLAG_CSUM6);
+				   flags & TUNNEL_ENCAP_FLAG_CSUM6);
 			print_bool(PRINT_JSON, "remcsum", NULL,
-					   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
+				   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
+
 			close_json_object();
 		} else {
-			if (sport == 0)
-				fputs("encap-sport auto ", f);
-			else
-				fprintf(f, "encap-sport %u", ntohs(sport));
+			int t;
 
-			fprintf(f, "encap-dport %u ", ntohs(dport));
+			t = sport ? ntohs(sport) + 1 : 0;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("sport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM)
-				fputs("encap-csum ", f);
-			else
-				fputs("noencap-csum ", f);
+			t = ntohs(dport) + 1;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("dport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
-				fputs("encap-csum6 ", f);
-			else
-				fputs("noencap-csum6 ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum", t, -1));
 
-			if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
-				fputs("encap-remcsum ", f);
-			else
-				fputs("noencap-remcsum ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM6;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum6", t, -1));
+
+			t = flags & TUNNEL_ENCAP_FLAG_REMCSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("remcsum", t, -1));
 		}
 	}
 }
diff --git a/ip/link_ip6tnl.c b/ip/link_ip6tnl.c
index 9594c3e..aa6f6fa 100644
--- a/ip/link_ip6tnl.c
+++ b/ip/link_ip6tnl.c
@@ -479,10 +479,7 @@ static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb
 		}
 
 		if (is_json_context()) {
-			print_uint(PRINT_JSON,
-				   "sport",
-				   NULL,
-				   sport ? ntohs(sport) : 0);
+			print_uint(PRINT_JSON, "sport", NULL, ntohs(sport));
 			print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
 			print_bool(PRINT_JSON, "csum", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_CSUM);
@@ -490,29 +487,30 @@ static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb
 				   flags & TUNNEL_ENCAP_FLAG_CSUM6);
 			print_bool(PRINT_JSON, "remcsum", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
+
 			close_json_object();
 		} else {
-			if (sport == 0)
-				fputs("encap-sport auto ", f);
-			else
-				fprintf(f, "encap-sport %u", ntohs(sport));
+			int t;
 
-			fprintf(f, "encap-dport %u ", ntohs(dport));
+			t = sport ? ntohs(sport) + 1 : 0;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("sport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM)
-				fputs("encap-csum ", f);
-			else
-				fputs("noencap-csum ", f);
+			t = ntohs(dport) + 1;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("dport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
-				fputs("encap-csum6 ", f);
-			else
-				fputs("noencap-csum6 ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum", t, -1));
 
-			if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
-				fputs("encap-remcsum ", f);
-			else
-				fputs("noencap-remcsum ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM6;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum6", t, -1));
+
+			t = flags & TUNNEL_ENCAP_FLAG_REMCSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("remcsum", t, -1));
 		}
 	}
 }
diff --git a/ip/link_iptnl.c b/ip/link_iptnl.c
index fcb0795..83a524f 100644
--- a/ip/link_iptnl.c
+++ b/ip/link_iptnl.c
@@ -510,46 +510,38 @@ static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[
 		}
 
 		if (is_json_context()) {
-			print_uint(PRINT_JSON,
-				   "sport",
-				   NULL,
-				   sport ? ntohs(sport) : 0);
+			print_uint(PRINT_JSON, "sport", NULL, ntohs(sport));
 			print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
-			print_bool(PRINT_JSON,
-				   "csum",
-				   NULL,
+			print_bool(PRINT_JSON, "csum", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_CSUM);
-			print_bool(PRINT_JSON,
-				   "csum6",
-				   NULL,
+			print_bool(PRINT_JSON, "csum6", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_CSUM6);
-			print_bool(PRINT_JSON,
-				   "remcsum",
-				   NULL,
+			print_bool(PRINT_JSON, "remcsum", NULL,
 				   flags & TUNNEL_ENCAP_FLAG_REMCSUM);
+
 			close_json_object();
 		} else {
-			if (sport == 0)
-				fputs("encap-sport auto ", f);
-			else
-				fprintf(f, "encap-sport %u", ntohs(sport));
+			int t;
 
-			fprintf(f, "encap-dport %u ", ntohs(dport));
+			t = sport ? ntohs(sport) + 1 : 0;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("sport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM)
-				fputs("encap-csum ", f);
-			else
-				fputs("noencap-csum ", f);
+			t = ntohs(dport) + 1;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("dport", 1, t));
 
-			if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
-				fputs("encap-csum6 ", f);
-			else
-				fputs("noencap-csum6 ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum", t, -1));
 
-			if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
-				fputs("encap-remcsum ", f);
-			else
-				fputs("noencap-remcsum ", f);
+			t = flags & TUNNEL_ENCAP_FLAG_CSUM6;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("csum6", t, -1));
+
+			t = flags & TUNNEL_ENCAP_FLAG_REMCSUM;
+			print_string(PRINT_FP, NULL, "%s",
+				     tnl_encap_optstr("remcsum", t, -1));
 		}
 	}
 }
diff --git a/ip/tunnel.c b/ip/tunnel.c
index f860103..1305e12 100644
--- a/ip/tunnel.c
+++ b/ip/tunnel.c
@@ -200,6 +200,30 @@ __be32 tnl_parse_key(const char *name, const char *key)
 	return htonl(uval);
 }
 
+const char *tnl_encap_optstr(const char *name, int enabled, int port)
+{
+	static const char ne[][sizeof("no")] = {
+		[0] = "no",
+		[1] = "",
+	};
+	static char buf[32];
+	char b1[16];
+	const char *val;
+
+	if (!port) {
+		val = "auto";
+	} else if (port < 0) {
+		val = "";
+	} else {
+		snprintf(b1, sizeof(b1), "%u", port - 1);
+		val = b1;
+	}
+
+	snprintf(buf, sizeof(buf), "%sencap-%s %s", ne[!!enabled], name, val);
+	return buf;
+}
+
+
 /* tnl_print_stats - print tunnel statistics
  *
  * @buf - tunnel interface's line in /proc/net/dev,
diff --git a/ip/tunnel.h b/ip/tunnel.h
index 9a03c0d..7af3592 100644
--- a/ip/tunnel.h
+++ b/ip/tunnel.h
@@ -32,6 +32,7 @@ int tnl_prl_ioctl(int cmd, const char *name, void *p);
 int tnl_6rd_ioctl(int cmd, const char *name, void *p);
 int tnl_ioctl_get_6rd(const char *name, void *p);
 __be32 tnl_parse_key(const char *name, const char *key);
+const char *tnl_encap_optstr(const char *name, int enabled, int port);
 void tnl_print_stats(const char *buf);
 
 #endif
