netdev - [PATCH iproute2 1/3] vxcan,veth: Forbid "type" for peer device

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Message-Id: <1514458864-17640-1-git-send-email-serhe.popovych@gmail.com>
Date:   Thu, 28 Dec 2017 13:01:04 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2 1/3] vxcan,veth: Forbid "type" for peer device

It is already given for original device we configure this
peer for.

Results from following command before/after change applied
are shown below:

  $ ip link add dev veth1a type veth peer name veth1b \
                           type veth peer name veth1c

Before:
-------

<no output, no netdevs created>

After:
------

Error: duplicate "type": "veth" is the second value.

Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
---
 ip/iplink_vxcan.c |    3 +++
 ip/link_veth.c    |    3 +++
 2 files changed, 6 insertions(+)

diff --git a/ip/iplink_vxcan.c b/ip/iplink_vxcan.c
index c13224c..ed0ad8b 100644
--- a/ip/iplink_vxcan.c
+++ b/ip/iplink_vxcan.c
@@ -65,6 +65,9 @@ static int vxcan_parse_opt(struct link_util *lu, int argc, char **argv,
 	if (err < 0)
 		return err;
 
+	if (type)
+		duparg("type", argv[err]);
+
 	if (name) {
 		addattr_l(hdr, 1024,
 			  IFLA_IFNAME, name, strlen(name) + 1);
diff --git a/ip/link_veth.c b/ip/link_veth.c
index fcfd1ef..fddb7ac 100644
--- a/ip/link_veth.c
+++ b/ip/link_veth.c
@@ -63,6 +63,9 @@ static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
 	if (err < 0)
 		return err;
 
+	if (type)
+		duparg("type", argv[err]);
+
 	if (name) {
 		addattr_l(hdr, 1024,
 			  IFLA_IFNAME, name, strlen(name) + 1);
-- 
1.7.10.4