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

[Serhey Popovych]

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.popov...@gmail.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