bridge: vlan: add support to show global vlan options

Add support for new bridge vlan command grouping called global which
operates on global options. The first command it supports is "show".
To do that we update print_vlan_rtm to recognize the global vlan options
attribute and parse it properly.
Man page and help are also updated with the new command.

Syntax is: $ bridge vlan global show [ vid VID ] [ dev DEV ]

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>

bridge/br_common.h

@@ -12,7 +12,8 @@ int print_mdb_mon(struct nlmsghdr *n, void *arg);
 int print_fdb(struct nlmsghdr *n, void *arg);
 void print_stp_state(__u8 state);
 int parse_stp_state(const char *arg);
-int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor);
+int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor,
+		   bool global_only);
 
 int do_fdb(int argc, char **argv);
 int do_mdb(int argc, char **argv);

bridge/monitor.c

@@ -71,7 +71,7 @@ static int accept_msg(struct rtnl_ctrl_data *ctrl,
 	case RTM_DELVLAN:
 		if (prefix_banner)
 			fprintf(fp, "[VLAN]");
-		return print_vlan_rtm(n, arg, true);
+		return print_vlan_rtm(n, arg, true, false);
 
 	default:
 		return 0;

bridge/vlan.c

@@ -36,7 +36,8 @@ static void usage(void)
 		"                                                     [ self ] [ master ]\n"
 		"       bridge vlan { set } vid VLAN_ID dev DEV [ state STP_STATE ]\n"
 		"       bridge vlan { show } [ dev DEV ] [ vid VLAN_ID ]\n"
-		"       bridge vlan { tunnelshow } [ dev DEV ] [ vid VLAN_ID ]\n");
+		"       bridge vlan { tunnelshow } [ dev DEV ] [ vid VLAN_ID ]\n"
+		"       bridge vlan global { show } [ dev DEV ] [ vid VLAN_ID ]\n");
 	exit(-1);
 }
 
@@ -621,6 +622,25 @@ static int print_vlan_stats(struct nlmsghdr *n, void *arg)
 	return 0;
 }
 
+static void print_vlan_global_opts(struct rtattr *a)
+{
+	struct rtattr *vtb[BRIDGE_VLANDB_GOPTS_MAX + 1];
+	__u16 vid, vrange = 0;
+
+	if ((a->rta_type & NLA_TYPE_MASK) != BRIDGE_VLANDB_GLOBAL_OPTIONS)
+		return;
+
+	parse_rtattr_flags(vtb, BRIDGE_VLANDB_GOPTS_MAX, RTA_DATA(a),
+			   RTA_PAYLOAD(a), NLA_F_NESTED);
+	vid = rta_getattr_u16(vtb[BRIDGE_VLANDB_GOPTS_ID]);
+	if (vtb[BRIDGE_VLANDB_GOPTS_RANGE])
+		vrange = rta_getattr_u16(vtb[BRIDGE_VLANDB_GOPTS_RANGE]);
+	else
+		vrange = vid;
+	print_range("vlan", vid, vrange);
+	print_nl();
+}
+
 static void print_vlan_opts(struct rtattr *a)
 {
 	struct rtattr *vtb[BRIDGE_VLANDB_ENTRY_MAX + 1];
@@ -680,7 +700,7 @@ static void print_vlan_opts(struct rtattr *a)
 		__print_one_vlan_stats(&vstats);
 }
 
-int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor)
+int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor, bool global_only)
 {
 	struct br_vlan_msg *bvm = NLMSG_DATA(n);
 	int len = n->nlmsg_len;
@@ -722,7 +742,8 @@ int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor)
 		unsigned short rta_type = a->rta_type & NLA_TYPE_MASK;
 
 		/* skip unknown attributes */
-		if (rta_type > BRIDGE_VLANDB_MAX)
+		if (rta_type > BRIDGE_VLANDB_MAX ||
+		    (global_only && rta_type != BRIDGE_VLANDB_GLOBAL_OPTIONS))
 			continue;
 
 		if (vlan_rtm_cur_ifidx != bvm->ifindex) {
@@ -737,6 +758,9 @@ int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor)
 		case BRIDGE_VLANDB_ENTRY:
 			print_vlan_opts(a);
 			break;
+		case BRIDGE_VLANDB_GLOBAL_OPTIONS:
+			print_vlan_global_opts(a);
+			break;
 		}
 		close_json_object();
 	}
@@ -746,7 +770,12 @@ int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor)
 
 static int print_vlan_rtm_filter(struct nlmsghdr *n, void *arg)
 {
-	return print_vlan_rtm(n, arg, false);
+	return print_vlan_rtm(n, arg, false, false);
+}
+
+static int print_vlan_rtm_global_filter(struct nlmsghdr *n, void *arg)
+{
+	return print_vlan_rtm(n, arg, false, true);
 }
 
 static int vlan_show(int argc, char **argv, int subject)
@@ -864,6 +893,61 @@ out:
 	return 0;
 }
 
+static int vlan_global_show(int argc, char **argv)
+{
+	__u32 dump_flags = BRIDGE_VLANDB_DUMPF_GLOBAL;
+	int ret = 0, subject = VLAN_SHOW_VLAN;
+	char *filter_dev = NULL;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "dev") == 0) {
+			NEXT_ARG();
+			if (filter_dev)
+				duparg("dev", *argv);
+			filter_dev = *argv;
+		} else if (strcmp(*argv, "vid") == 0) {
+			NEXT_ARG();
+			if (filter_vlan)
+				duparg("vid", *argv);
+			filter_vlan = atoi(*argv);
+		}
+		argc--; argv++;
+	}
+
+	if (filter_dev) {
+		filter_index = ll_name_to_index(filter_dev);
+		if (!filter_index)
+			return nodev(filter_dev);
+	}
+
+	new_json_obj(json);
+
+	if (rtnl_brvlandump_req(&rth, PF_BRIDGE, dump_flags) < 0) {
+		perror("Cannot send dump request");
+		exit(1);
+	}
+
+	if (!is_json_context()) {
+		printf("%-" __stringify(IFNAMSIZ) "s  %-"
+		       __stringify(VLAN_ID_LEN) "s", "port",
+		       "vlan-id");
+		printf("\n");
+	}
+
+	ret = rtnl_dump_filter(&rth, print_vlan_rtm_global_filter, &subject);
+	if (ret < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		exit(1);
+	}
+
+	if (vlan_rtm_cur_ifidx != -1)
+		close_vlan_port();
+
+	delete_json_obj();
+	fflush(stdout);
+	return 0;
+}
+
 void print_vlan_info(struct rtattr *tb, int ifindex)
 {
 	struct rtattr *i, *list = tb;
@@ -908,6 +992,22 @@ void print_vlan_info(struct rtattr *tb, int ifindex)
 		close_vlan_port();
 }
 
+static int vlan_global(int argc, char **argv)
+{
+	if (argc > 0) {
+		if (strcmp(*argv, "show") == 0 ||
+		    strcmp(*argv, "lst") == 0 ||
+		    strcmp(*argv, "list") == 0)
+			return vlan_global_show(argc-1, argv+1);
+		else
+			usage();
+	} else {
+		return vlan_global_show(0, NULL);
+	}
+
+	return 0;
+}
+
 int do_vlan(int argc, char **argv)
 {
 	ll_init_map(&rth);
@@ -926,6 +1026,8 @@ int do_vlan(int argc, char **argv)
 		}
 		if (matches(*argv, "set") == 0)
 			return vlan_option_set(argc-1, argv+1);
+		if (strcmp(*argv, "global") == 0)
+			return vlan_global(argc-1, argv+1);
 		if (matches(*argv, "help") == 0)
 			usage();
 	} else {

man/man8/bridge.8

@@ -152,6 +152,13 @@ bridge \- show / manipulate bridge addresses and devices
 .B dev
 .IR DEV " ]"
 
+.ti -8
+.BR "bridge vlan global" " [ " show " ] [ "
+.B dev
+.IR DEV " ] [ "
+.B vid
+.IR VID " ]"
+
 .ti -8
 .BR "bridge monitor" " [ " all " | " neigh " | " link " | " mdb " | " vlan " ]"
 
@@ -895,6 +902,20 @@ option, the command displays per-vlan traffic statistics.
 
 This command displays the current vlan tunnel info mapping.
 
+.SS bridge vlan global show - list global vlan options.
+
+This command displays the global VLAN options for each VLAN entry.
+
+.TP
+.BI dev " DEV"
+the interface only whose VLAN global options should be listed. Default is to list
+all bridge interfaces.
+
+.TP
+.BI vid " VID"
+the VLAN ID only whose global options should be listed. Default is to list
+all vlans.
+
 .SH bridge monitor - state monitoring
 
 The