ip: link: Add missing link type help texts

These are basically stubs: The types which lacked their own help text
simply don't accept any options (yet). Still it might be a bit confusing
to users if they are presented with the generic 'ip link' help text
instead of something saying there are no type specific options.

Signed-off-by: Phil Sutter <phil@nwl.cc>

ip/Makefile

@@ -1,7 +1,8 @@
 IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
     rtm_map.o iptunnel.o ip6tunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \
     ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o iptuntap.o iptoken.o \
-    ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o \
+    ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o iplink_dummy.o \
+    iplink_ifb.o iplink_nlmon.o iplink_team.o iplink_vcan.o \
     iplink_vlan.o link_veth.o link_gre.o iplink_can.o iplink_xdp.o \
     iplink_macvlan.o ipl2tp.o link_vti.o link_vti6.o \
     iplink_vxlan.o tcp_metrics.o iplink_ipoib.o ipnetconf.o link_ip6tnl.o \

ip/iplink_dummy.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void dummy_print_help(struct link_util *lu,
+			    int argc, char **argv, FILE *f)
+{
+	fprintf(f, "Usage: ... dummy\n");
+}
+
+struct link_util dummy_link_util = {
+	.id		= "dummy",
+	.print_help	= dummy_print_help,
+};

ip/iplink_ifb.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void ifb_print_help(struct link_util *lu,
+			    int argc, char **argv, FILE *f)
+{
+	fprintf(f, "Usage: ... ifb\n");
+}
+
+struct link_util ifb_link_util = {
+	.id		= "ifb",
+	.print_help	= ifb_print_help,
+};

ip/iplink_nlmon.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void nlmon_print_help(struct link_util *lu,
+			    int argc, char **argv, FILE *f)
+{
+	fprintf(f, "Usage: ... nlmon\n");
+}
+
+struct link_util nlmon_link_util = {
+	.id		= "nlmon",
+	.print_help	= nlmon_print_help,
+};

ip/iplink_team.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void team_print_help(struct link_util *lu,
+			    int argc, char **argv, FILE *f)
+{
+	fprintf(f, "Usage: ... team\n");
+}
+
+static void team_slave_print_help(struct link_util *lu,
+				  int argc, char **argv, FILE *f)
+{
+	fprintf(f, "Usage: ... team_slave\n");
+}
+
+struct link_util team_link_util = {
+	.id		= "team",
+	.print_help	= team_print_help,
+}, team_slave_link_util = {
+	.id		= "team_slave",
+	.print_help	= team_slave_print_help,
+};

ip/iplink_vcan.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void vcan_print_help(struct link_util *lu,
+			    int argc, char **argv, FILE *f)
+{
+	fprintf(f, "Usage: ... vcan\n");
+}
+
+struct link_util vcan_link_util = {
+	.id		= "vcan",
+	.print_help	= vcan_print_help,
+};