ip link: support "add TYPE vrf", improve --help

VRF interfaces have a mandatory table parameter, which needs to be
specified using a RTNL attribute.

function                                             old     new   delta
do_add_or_delete                                    1150    1254    +104
packed_usage                                       32444   32546    +102
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 206/0)             Total: 206 bytes

Signed-off-by: Jan Luebbe <jluebbe@debian.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/ip.c

@@ -155,11 +155,60 @@
 //usage:
 //--------------123456789.123456789.123456789.123456789.123456789.123456789.123456789.123....79
 //usage:#define iplink_trivial_usage
-//usage:       "set IFACE [up|down] [arp on|off] | show [IFACE]"
+//usage:       /*Usage:iplink*/"set IFACE [up|down] [arp on|off] [multicast on|off]\n"
-//usage:#define iplink_full_usage "\n\n"
+//usage:       "	[promisc on|off] [mtu NUM] [name NAME] [qlen NUM] [address MAC]"
-//usage:       "iplink set IFACE [up|down] [arp on|off] [multicast on|off] [promisc on|off]\n"
+// * short help shows only "set" command, long help continues (with just one "\n")
-//usage:       "	[mtu NUM] [name NAME] [qlen NUM] [address MAC]\n"
+// * and shows all other commands:
+//usage:#define iplink_full_usage "\n"
+//usage:       "iplink add [link IFACE] IFACE [address MAC] type TYPE [ARGS]\n"
+//usage:       "iplink delete IFACE type TYPE [ARGS]\n"
+//usage:       "	TYPE ARGS := vlan VLANARGS | vrf table NUM\n"
+//usage:       "	VLANARGS := id VLANID [protocol 802.1q|802.1ad] [reorder_hdr on|off]\n"
+//usage:       "		[gvrp on|off] [mvrp on|off] [loose_binding on|off]\n"
 //usage:       "iplink show [IFACE]"
+//upstream man ip-link:
+//=====================
+//ip link add [link DEV] [ name ] NAME
+//                   [ txqueuelen PACKETS ]
+//                   [ address LLADDR ]
+//                   [ broadcast LLADDR ]
+//                   [ mtu MTU ] [index IDX ]
+//                   [ numtxqueues QUEUE_COUNT ]
+//                   [ numrxqueues QUEUE_COUNT ]
+//                   type TYPE [ ARGS ]
+//       ip link delete { DEVICE | dev DEVICE | group DEVGROUP } type TYPE [ ARGS ]
+//       ip link set { DEVICE | dev DEVICE | group DEVGROUP } [ { up | down } ]
+//                      [ arp { on | off } ]
+//                      [ dynamic { on | off } ]
+//                      [ multicast { on | off } ]
+//                      [ allmulticast { on | off } ]
+//                      [ promisc { on | off } ]
+//                      [ trailers { on | off } ]
+//                      [ txqueuelen PACKETS ]
+//                      [ name NEWNAME ]
+//                      [ address LLADDR ]
+//                      [ broadcast LLADDR ]
+//                      [ mtu MTU ]
+//                      [ netns { PID | NAME } ]
+//                      [ link-netnsid ID ]
+//	      [ alias NAME ]
+//                      [ vf NUM [ mac LLADDR ]
+//		   [ vlan VLANID [ qos VLAN-QOS ] ]
+//		   [ rate TXRATE ]
+//		   [ spoofchk { on | off} ]
+//		   [ query_rss { on | off} ]
+//		   [ state { auto | enable | disable} ] ]
+//		   [ trust { on | off} ] ]
+//	      [ master DEVICE ]
+//	      [ nomaster ]
+//	      [ addrgenmode { eui64 | none | stable_secret | random } ]
+//                      [ protodown { on | off } ]
+//       ip link show [ DEVICE | group GROUP ] [up] [master DEV] [type TYPE]
+//       ip link help [ TYPE ]
+//TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | macvtap |
+//          bridge | bond | ipoib | ip6tnl | ipip | sit | vxlan |
+//          gre | gretap | ip6gre | ip6gretap | vti | nlmon |
+//          bond_slave | ipvlan | geneve | bridge_slave | vrf }
 //usage:
 //--------------123456789.123456789.123456789.123456789.123456789.123456789.123456789.123....79
 //usage:#define iproute_trivial_usage

networking/libiproute/iplink.c

@@ -525,6 +525,24 @@ static void vlan_parse_opt(char **argv, struct nlmsghdr *n, unsigned int size)
 		addattr_l(n, size, IFLA_VLAN_FLAGS, &flags, sizeof(flags));
 }
 
+static void vrf_parse_opt(char **argv, struct nlmsghdr *n, unsigned int size)
+{
+/* IFLA_VRF_TABLE is an enum, not a define -
+ * can't test "defined(IFLA_VRF_TABLE)".
+ */
+#if !defined(IFLA_VRF_MAX)
+# define IFLA_VRF_TABLE 1
+#endif
+	uint32_t table;
+
+	if (strcmp(*argv, "table") != 0)
+		invarg_1_to_2(*argv, "type vrf");
+
+	NEXT_ARG();
+	table = get_u32(*argv, "table");
+	addattr_l(n, size, IFLA_VRF_TABLE, &table, sizeof(table));
+}
+
 #ifndef NLMSG_TAIL
 #define NLMSG_TAIL(nmsg) \
 	((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
@@ -563,6 +581,8 @@ static int do_add_or_delete(char **argv, const unsigned rtm)
 	if (rtm == RTM_NEWLINK)
 		req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
 
+	/* NB: update iplink_full_usage if you extend this code */
+
 	while (*argv) {
 		arg = index_in_substrings(keywords, *argv);
 		if (arg == ARG_type) {
@@ -582,7 +602,7 @@ static int do_add_or_delete(char **argv, const unsigned rtm)
 		} else if (arg == ARG_address) {
 			NEXT_ARG();
 			address_str = *argv;
-			dbg("address_str:'%s'", name_str);
+			dbg("address_str:'%s'", address_str);
 		} else {
 			if (arg == ARG_dev) {
 				if (dev_str)
@@ -609,6 +629,8 @@ static int do_add_or_delete(char **argv, const unsigned rtm)
 
 			if (strcmp(type_str, "vlan") == 0)
 				vlan_parse_opt(argv, &req.n, sizeof(req));
+			else if (strcmp(type_str, "vrf") == 0)
+				vrf_parse_opt(argv, &req.n, sizeof(req));
 
 			data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
 		}