[PATCH iproute2 v2 7/9] vti/tunnel: Unify ikey/okey printing

[Serhey Popovych <serhe.popovych@gmail.com>]

For vti6 tunnel we print [io]key in dotted-quad notation
(ipv4 address) while in vti we do that in hex format.

For vti tunnel we print [io]key only if value is not
zero while for vti6 we miss such check.

Unify vti and vti6 tunnel [io]key output.

While here enlarge s2 buffer to the same size as in rest
of tunnel support code (64 bytes) and check return from
inet_ntop().

Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
---
 ip/link_vti.c  |   22 ++++++++++++++--------
 ip/link_vti6.c |   14 ++++++++++----
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/ip/link_vti.c b/ip/link_vti.c
index baaaf2f..1439e53 100644
--- a/ip/link_vti.c
+++ b/ip/link_vti.c
@@ -167,8 +167,7 @@ static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 {
 	const char *local = "any";
 	const char *remote = "any";
-	__u32 key;
-	char s2[IFNAMSIZ];
+	char s2[64];
 
 	if (!tb)
 		return;
@@ -200,14 +199,21 @@ static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 		}
 	}
 
-	if (tb[IFLA_VTI_IKEY] &&
-	    (key = rta_getattr_u32(tb[IFLA_VTI_IKEY])))
-		print_0xhex(PRINT_ANY, "ikey", "ikey %#x ", ntohl(key));
+	if (tb[IFLA_VTI_IKEY]) {
+		struct rtattr *rta = tb[IFLA_VTI_IKEY];
+		__u32 key = rta_getattr_u32(rta);
 
+		if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
+			print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
+	}
+
+	if (tb[IFLA_VTI_OKEY]) {
+		struct rtattr *rta = tb[IFLA_VTI_OKEY];
+		__u32 key = rta_getattr_u32(rta);
 
-	if (tb[IFLA_VTI_OKEY] &&
-	    (key = rta_getattr_u32(tb[IFLA_VTI_OKEY])))
-		print_0xhex(PRINT_ANY, "okey", "okey %#x ", ntohl(key));
+		if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
+			print_string(PRINT_ANY, "okey", "okey %s ", s2);
+	}
 
 	if (tb[IFLA_VTI_FWMARK]) {
 		__u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
diff --git a/ip/link_vti6.c b/ip/link_vti6.c
index 952dbb0..6b61e3d 100644
--- a/ip/link_vti6.c
+++ b/ip/link_vti6.c
@@ -199,13 +199,19 @@ static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 	}
 
 	if (tb[IFLA_VTI_IKEY]) {
-		inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
-		print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
+		struct rtattr *rta = tb[IFLA_VTI_IKEY];
+		__u32 key = rta_getattr_u32(rta);
+
+		if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
+			print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 	}
 
 	if (tb[IFLA_VTI_OKEY]) {
-		inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
-		print_string(PRINT_ANY, "okey", "okey %s ", s2);
+		struct rtattr *rta = tb[IFLA_VTI_OKEY];
+		__u32 key = rta_getattr_u32(rta);
+
+		if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2)))
+			print_string(PRINT_ANY, "okey", "okey %s ", s2);
 	}
 
 	if (tb[IFLA_VTI_FWMARK]) {
-- 
1.7.10.4