netdev - [PATCH iproute2-next 1/2] bridge: vlan: Add support for neigh

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Date:   Mon, 24 Apr 2023 19:09:50 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org
Cc:     dsahern@...il.com, stephen@...workplumber.org, razor@...ckwall.org,
        liuhangbin@...il.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH iproute2-next 1/2] bridge: vlan: Add support for neigh_suppress option

Add support for the per-VLAN neigh_suppress option. Example:

 # bridge vlan set vid 10 dev swp1 neigh_suppress on
 # bridge -d -j -p vlan show dev swp1 vid 10
 [ {
         "ifname": "swp1",
         "vlans": [ {
                 "vlan": 10,
                 "state": "forwarding",
                 "mcast_router": 1,
                 "neigh_suppress": true
             } ]
     } ]
 # bridge -d vlan show dev swp1 vid 10
 port              vlan-id
 swp1              10
                     state forwarding mcast_router 1 neigh_suppress on

 # bridge vlan set vid 10 dev swp1 neigh_suppress off
 # bridge -d -j -p vlan show dev swp1 vid 10
 [ {
         "ifname": "swp1",
         "vlans": [ {
                 "vlan": 10,
                 "state": "forwarding",
                 "mcast_router": 1,
                 "neigh_suppress": false
             } ]
     } ]
 # bridge -d vlan show dev swp1 vid 10
 port              vlan-id
 swp1              10
                     state forwarding mcast_router 1 neigh_suppress off

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 bridge/vlan.c     | 18 ++++++++++++++++++
 man/man8/bridge.8 | 11 ++++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/bridge/vlan.c b/bridge/vlan.c
index 44e1ba39f01d..5b304ea94224 100644
--- a/bridge/vlan.c
+++ b/bridge/vlan.c
@@ -38,6 +38,7 @@ static void usage(void)
 		"       bridge vlan { set } vid VLAN_ID dev DEV [ state STP_STATE ]\n"
 		"                                               [ mcast_router MULTICAST_ROUTER ]\n"
 		"                                               [ mcast_max_groups MAX_GROUPS ]\n"
+		"                                               [ neigh_suppress {on | off} ]\n"
 		"       bridge vlan { show } [ dev DEV ] [ vid VLAN_ID ]\n"
 		"       bridge vlan { tunnelshow } [ dev DEV ] [ vid VLAN_ID ]\n"
 		"       bridge vlan global { set } vid VLAN_ID dev DEV\n"
@@ -354,6 +355,18 @@ static int vlan_option_set(int argc, char **argv)
 			addattr32(&req.n, sizeof(req),
 				  BRIDGE_VLANDB_ENTRY_MCAST_MAX_GROUPS,
 				  max_groups);
+		} else if (strcmp(*argv, "neigh_suppress") == 0) {
+			bool neigh_suppress;
+			int ret;
+
+			NEXT_ARG();
+			neigh_suppress = parse_on_off("neigh_suppress", *argv,
+						      &ret);
+			if (ret)
+				return ret;
+			addattr8(&req.n, sizeof(req),
+				 BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS,
+				 neigh_suppress);
 		} else {
 			if (matches(*argv, "help") == 0)
 				NEXT_ARG();
@@ -1041,6 +1054,11 @@ static void print_vlan_opts(struct rtattr *a, int ifindex)
 		print_uint(PRINT_ANY, "mcast_max_groups", "mcast_max_groups %u ",
 			   rta_getattr_u32(vattr));
 	}
+	if (vtb[BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS]) {
+		vattr = vtb[BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS];
+		print_on_off(PRINT_ANY, "neigh_suppress", "neigh_suppress %s ",
+			     rta_getattr_u8(vattr));
+	}
 	print_nl();
 	if (show_stats)
 		__print_one_vlan_stats(&vstats);
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index 4006ad23ea74..3bda6dbd61d0 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -184,7 +184,8 @@ bridge \- show / manipulate bridge addresses and devices
 .B mcast_max_groups
 .IR MAX_GROUPS " ] [ "
 .B mcast_router
-.IR MULTICAST_ROUTER " ]"
+.IR MULTICAST_ROUTER " ] [ "
+.BR neigh_suppress " { " on " | " off " } ]"
 
 .ti -8
 .BR "bridge vlan" " [ " show " | " tunnelshow " ] [ "
@@ -1204,6 +1205,14 @@ may be either
 enable multicast traffic forwarding. This mode is available only for ports.
 .sp
 
+.TP
+.BR "neigh_suppress on " or " neigh_suppress off "
+Controls whether neigh discovery (arp and nd) proxy and suppression is enabled
+for a given VLAN on a given port. By default this flag is off.
+
+Note that this option only takes effect when \fBbridge link\fR option
+\fBneigh_vlan_suppress\fR is enabled for a given port.
+
 .SS bridge vlan show - list vlan configuration.
 
 This command displays the current VLAN filter table.
-- 
2.40.0