bridge: monitor: add support for vlan monitoring

Add support for vlan activity monitoring, we display vlan notifications on
vlan add/del/options change. The man page and help are also updated
accordingly.

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

bridge/br_common.h

@@ -12,7 +12,7 @@ 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);
+int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor);
 
 int do_fdb(int argc, char **argv);
 int do_mdb(int argc, char **argv);

bridge/mdb.c

@@ -16,9 +16,9 @@
 #include <arpa/inet.h>
 
 #include "libnetlink.h"
+#include "utils.h"
 #include "br_common.h"
 #include "rt_names.h"
-#include "utils.h"
 #include "json_print.h"
 
 #ifndef MDBA_RTA

bridge/monitor.c

@@ -31,7 +31,7 @@ static int prefix_banner;
 
 static void usage(void)
 {
-	fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | all]\n");
+	fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | vlan | all]\n");
 	exit(-1);
 }
 
@@ -67,6 +67,12 @@ static int accept_msg(struct rtnl_ctrl_data *ctrl,
 		print_nlmsg_timestamp(fp, n);
 		return 0;
 
+	case RTM_NEWVLAN:
+	case RTM_DELVLAN:
+		if (prefix_banner)
+			fprintf(fp, "[VLAN]");
+		return print_vlan_rtm(n, arg, true);
+
 	default:
 		return 0;
 	}
@@ -79,6 +85,7 @@ int do_monitor(int argc, char **argv)
 	int llink = 0;
 	int lneigh = 0;
 	int lmdb = 0;
+	int lvlan = 0;
 
 	rtnl_close(&rth);
 
@@ -95,8 +102,12 @@ int do_monitor(int argc, char **argv)
 		} else if (matches(*argv, "mdb") == 0) {
 			lmdb = 1;
 			groups = 0;
+		} else if (matches(*argv, "vlan") == 0) {
+			lvlan = 1;
+			groups = 0;
 		} else if (strcmp(*argv, "all") == 0) {
 			groups = ~RTMGRP_TC;
+			lvlan = 1;
 			prefix_banner = 1;
 		} else if (matches(*argv, "help") == 0) {
 			usage();
@@ -134,6 +145,12 @@ int do_monitor(int argc, char **argv)
 
 	if (rtnl_open(&rth, groups) < 0)
 		exit(1);
+
+	if (lvlan && rtnl_add_nl_group(&rth, RTNLGRP_BRVLAN) < 0) {
+		fprintf(stderr, "Failed to add bridge vlan group to list\n");
+		exit(1);
+	}
+
 	ll_init_map(&rth);
 
 	if (rtnl_listen(&rth, accept_msg, stdout) < 0)

bridge/vlan.c

@@ -621,7 +621,7 @@ static int print_vlan_stats(struct nlmsghdr *n, void *arg)
 	return 0;
 }
 
-int print_vlan_rtm(struct nlmsghdr *n, void *arg)
+int print_vlan_rtm(struct nlmsghdr *n, void *arg, bool monitor)
 {
 	struct rtattr *vtb[BRIDGE_VLANDB_ENTRY_MAX + 1], *a;
 	struct br_vlan_msg *bvm = NLMSG_DATA(n);
@@ -648,6 +648,12 @@ int print_vlan_rtm(struct nlmsghdr *n, void *arg)
 	if (filter_index && filter_index != bvm->ifindex)
 		return 0;
 
+	if (n->nlmsg_type == RTM_DELVLAN)
+		print_bool(PRINT_ANY, "deleted", "Deleted ", true);
+
+	if (monitor)
+		vlan_rtm_cur_ifidx = -1;
+
 	if (vlan_rtm_cur_ifidx == -1 || vlan_rtm_cur_ifidx != bvm->ifindex) {
 		if (vlan_rtm_cur_ifidx != -1)
 			close_vlan_port();
@@ -720,6 +726,11 @@ int print_vlan_rtm(struct nlmsghdr *n, void *arg)
 	return 0;
 }
 
+static int print_vlan_rtm_filter(struct nlmsghdr *n, void *arg)
+{
+	return print_vlan_rtm(n, arg, false);
+}
+
 static int vlan_show(int argc, char **argv, int subject)
 {
 	char *filter_dev = NULL;
@@ -764,7 +775,7 @@ static int vlan_show(int argc, char **argv, int subject)
 			printf("\n");
 		}
 
-		ret = rtnl_dump_filter(&rth, print_vlan_rtm, &subject);
+		ret = rtnl_dump_filter(&rth, print_vlan_rtm_filter, &subject);
 		if (ret < 0) {
 			fprintf(stderr, "Dump terminated\n");
 			exit(1);

man/man8/bridge.8

@@ -153,7 +153,7 @@ bridge \- show / manipulate bridge addresses and devices
 .IR DEV " ]"
 
 .ti -8
-.BR "bridge monitor" " [ " all " | " neigh " | " link " | " mdb " ]"
+.BR "bridge monitor" " [ " all " | " neigh " | " link " | " mdb " | " vlan " ]"
 
 .SH OPTIONS
 
@@ -911,7 +911,7 @@ command is the first in the command line and then the object list follows:
 .I OBJECT-LIST
 is the list of object types that we want to monitor.
 It may contain
-.BR link ", " fdb ", and " mdb "."
+.BR link ", " fdb ", " vlan " and " mdb "."
 If no
 .B file
 argument is given,