[PATCH iproute2-next 3/4] bridge: link: Add MAC Authentication Bypass (MAB) support

@@ -184,6 +184,9 @@ static void print_protinfo(FILE *fp, struct rtattr *attr)
 		if (prtb[IFLA_BRPORT_LOCKED])
 			print_on_off(PRINT_ANY, "locked", "locked %s ",
 				     rta_getattr_u8(prtb[IFLA_BRPORT_LOCKED]));
+		if (prtb[IFLA_BRPORT_MAB])
+			print_on_off(PRINT_ANY, "mab", "mab %s ",
+				     rta_getattr_u8(prtb[IFLA_BRPORT_MAB]));
 	} else
 		print_stp_state(rta_getattr_u8(attr));
 }

@@ -283,6 +286,7 @@ static void usage(void)
 		"                               [ vlan_tunnel {on | off} ]\n"
 		"                               [ isolated {on | off} ]\n"
 		"                               [ locked {on | off} ]\n"
+		"                               [ mab {on | off} ]\n"
 		"                               [ hwmode {vepa | veb} ]\n"
 		"                               [ backup_port DEVICE ] [ nobackup_port ]\n"
 		"                               [ self ] [ master ]\n"

@@ -314,6 +318,7 @@ static int brlink_modify(int argc, char **argv)
 	__s8 bcast_flood = -1;
 	__s8 mcast_to_unicast = -1;
 	__s8 locked = -1;
+	__s8 macauth = -1;
 	__s8 isolated = -1;
 	__s8 hairpin = -1;
 	__s8 bpdu_guard = -1;

@@ -439,6 +444,11 @@ static int brlink_modify(int argc, char **argv)
 			locked = parse_on_off("locked", *argv, &ret);
 			if (ret)
 				return ret;
+		} else if (strcmp(*argv, "mab") == 0) {
+			NEXT_ARG();
+			macauth = parse_on_off("mab", *argv, &ret);
+			if (ret)
+				return ret;
 		} else if (strcmp(*argv, "backup_port") == 0) {
 			NEXT_ARG();
 			backup_port_idx = ll_name_to_index(*argv);

@@ -522,6 +532,9 @@ static int brlink_modify(int argc, char **argv)
 	if (locked >= 0)
 		addattr8(&req.n, sizeof(req), IFLA_BRPORT_LOCKED, locked);
 
+	if (macauth >= 0)
+		addattr8(&req.n, sizeof(req), IFLA_BRPORT_MAB, macauth);
+
 	if (backup_port_idx != -1)
 		addattr32(&req.n, sizeof(req), IFLA_BRPORT_BACKUP_PORT,
 			  backup_port_idx);

@@ -44,6 +44,7 @@ static void print_explain(FILE *f)
 		"			[ vlan_tunnel {on | off} ]\n"
 		"			[ isolated {on | off} ]\n"
 		"			[ locked {on | off} ]\n"
+		"                       [ mab {on | off} ]\n"
 		"			[ backup_port DEVICE ] [ nobackup_port ]\n"
 	);
 }

@@ -288,6 +289,10 @@ static void bridge_slave_print_opt(struct link_util *lu, FILE *f,
 		print_on_off(PRINT_ANY, "locked", "locked %s ",
 			     rta_getattr_u8(tb[IFLA_BRPORT_LOCKED]));
 
+	if (tb[IFLA_BRPORT_MAB])
+		print_on_off(PRINT_ANY, "mab", "mab %s ",
+			     rta_getattr_u8(tb[IFLA_BRPORT_MAB]));
+
 	if (tb[IFLA_BRPORT_BACKUP_PORT]) {
 		int backup_p = rta_getattr_u32(tb[IFLA_BRPORT_BACKUP_PORT]);
 

@@ -411,6 +416,10 @@ static int bridge_slave_parse_opt(struct link_util *lu, int argc, char **argv,
 			NEXT_ARG();
 			bridge_slave_parse_on_off("locked", *argv, n,
 						  IFLA_BRPORT_LOCKED);
+		} else if (strcmp(*argv, "mab") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("mab", *argv, n,
+						  IFLA_BRPORT_MAB);
 		} else if (matches(*argv, "backup_port") == 0) {
 			int ifindex;
 

@@ -54,6 +54,7 @@ bridge \- show / manipulate bridge addresses and devices
 .BR vlan_tunnel " { " on " | " off " } ] [ "
 .BR isolated " { " on " | " off " } ] [ "
 .BR locked " { " on " | " off " } ] [ "
+.BR mab " { " on " | " off " } ] [ "
 .B backup_port
 .IR  DEVICE " ] ["
 .BR nobackup_port " ] [ "

@@ -580,6 +581,21 @@ The common use is that hosts are allowed access through authentication
 with the IEEE 802.1X protocol or based on whitelists or like setups.
 By default this flag is off.
 
+.TP
+.BR "mab on " or " mab off "
+Controls whether MAC Authentication Bypass (MAB) is enabled on the port or not.
+MAB can only be enabled on a locked port that has learning enabled. When
+enabled, FDB entries are learned from received traffic and have the "locked"
+FDB flag set. The flag can only be set by the kernel and it indicates that the
+FDB entry cannot be used to authenticate the corresponding host. User space can
+decide to authenticate the host by replacing the FDB entry and clearing the
+"locked" FDB flag. Locked FDB entries can roam to unlocked (authorized) ports
+in which case the "locked" flag is cleared. FDB entries cannot roam to locked
+ports regardless of MAB being enabled or not. Therefore, locked FDB entries are
+only created if an FDB entry with the given {MAC, VID} does not already exist.
+This behavior prevents unauthenticated hosts from disrupting traffic destined
+to already authenticated hosts. Locked FDB entries act like regular dynamic
+entries with respect to forwarding and aging. By default this flag is off.
 
 .TP
 .BI backup_port " DEVICE"

@@ -2471,6 +2471,9 @@ the following additional arguments are supported:
 .BR isolated " { " on " | " off " }"
 ] [
 .BR locked " { " on " | " off " }"
+] [
+.BR mab " { " on " | " off " }"
+] [
 .BR backup_port " DEVICE"
 ] [
 .BR nobackup_port " ]"

@@ -2577,6 +2580,21 @@ default this flag is off.
 behind the port cannot communicate through the port unless a FDB entry
 representing the host is in the FDB. By default this flag is off.
 
+.BR mab " { " on " | " off " }"
+- controls whether MAC Authentication Bypass (MAB) is enabled on the port or
+not.  MAB can only be enabled on a locked port that has learning enabled. When
+enabled, FDB entries are learned from received traffic and have the "locked"
+FDB flag set. The flag can only be set by the kernel and it indicates that the
+FDB entry cannot be used to authenticate the corresponding host. User space can
+decide to authenticate the host by replacing the FDB entry and clearing the
+"locked" FDB flag. Locked FDB entries can roam to unlocked (authorized) ports
+in which case the "locked" flag is cleared. FDB entries cannot roam to locked
+ports regardless of MAB being enabled or not. Therefore, locked FDB entries are
+only created if an FDB entry with the given {MAC, VID} does not already exist.
+This behavior prevents unauthenticated hosts from disrupting traffic destined
+to already authenticated hosts. Locked FDB entries act like regular dynamic
+entries with respect to forwarding and aging. By default this flag is off.
+
 .BI backup_port " DEVICE"
 - if the port loses carrier all traffic will be redirected to the
 configured backup port