thr3ads.net - Linux Ethernet Bridging - [Bridge] [RFC PATCH net-next 0/9] bridge: Add per-{Port, VLAN} neighbor suppression [Apr 2023]

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Ido Schimmel

2023-Apr-13 09:58 UTC

[Bridge] [RFC PATCH net-next 0/9] bridge: Add per-{Port, VLAN} neighbor suppression

Background
=========
In order to minimize the flooding of ARP and ND messages in the VXLAN
network, EVPN includes provisions [1] that allow participating VTEPs to
suppress such messages in case they know the MAC-IP binding and can
reply on behalf of the remote host. In Linux, the above is implemented
in the bridge driver using a per-port option called "neigh_suppress"
that was added in kernel version 4.15 [2].

Motivation
=========
Some applications use ARP messages as keepalives between the application
nodes in the network. This works perfectly well?when two nodes are
connected to the same VTEP. When a node goes down it will stop
responding to ARP requests and the other node will notice it
immediately.

However, when the two nodes are connected to different VTEPs and
neighbor suppression is enabled, the local VTEP will reply to ARP
requests even after the remote node went down, until certain timers
expire and the EVPN control plane decides to withdraw the?MAC/IP
Advertisement route for the address. Therefore, some users would like to
be able to disable neighbor suppression on VLANs where such applications
reside and keep it enabled on the rest.

Implementation
=============
The proposed solution is to allow user space to control neighbor
suppression on a per-{Port, VLAN} basis, in a similar fashion to other
per-port options that gained per-{Port, VLAN} counterparts such as
"mcast_router". This allows users to benefit from the operational
simplicity and scalability associated with shared VXLAN devices (i.e.,
external / collect-metadata mode), while still allowing for per-VLAN/VNI
neighbor suppression control.

The user interface is extended with a new "neigh_vlan_suppress" bridge
port option that allows user space to enable per-{Port, VLAN} neighbor
suppression on the bridge port. When enabled, the existing
"neigh_suppress" option has no effect and neighbor suppression is
controlled using a new "neigh_suppress" VLAN option. Example usage:

 # bridge link set dev vxlan0 neigh_vlan_suppress on
 # bridge vlan add vid 10 dev vxlan0
 # bridge vlan set vid 10 dev vxlan0 neigh_suppress on

Testing
======
Tested using existing bridge selftests. Added a dedicated selftest in
the last patch.

Patchset overview
================
Patches #1-#5 are preparations.

Patch #6 adds per-{Port, VLAN} neighbor suppression support to the
bridge's data path.

Patches #7-#8 add the required netlink attributes to enable the feature.

Patch #9 adds a selftest.

iproute2 patches can be found here [3].

[1] https://www.rfc-editor.org/rfc/rfc7432#section-10
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a42317785c898c0ed46db45a33b0cc71b671bf29
[3] https://github.com/idosch/iproute2/tree/submit/neigh_suppress_v1

Ido Schimmel (9):
  bridge: Reorder neighbor suppression check when flooding
  bridge: Pass VLAN ID to br_flood()
  bridge: Add internal flags for per-{Port, VLAN} neighbor suppression
  bridge: Take per-{Port, VLAN} neighbor suppression into account
  bridge: Encapsulate data path neighbor suppression logic
  bridge: Add per-{Port, VLAN} neighbor suppression data path support
  bridge: vlan: Allow setting VLAN neighbor suppression state
  bridge: Allow setting per-{Port, VLAN} neighbor suppression state
  selftests: net: Add bridge neighbor suppression test

 include/linux/if_bridge.h                     |   1 +
 include/uapi/linux/if_bridge.h                |   1 +
 include/uapi/linux/if_link.h                  |   1 +
 net/bridge/br_arp_nd_proxy.c                  |  33 +-
 net/bridge/br_device.c                        |   8 +-
 net/bridge/br_forward.c                       |   8 +-
 net/bridge/br_if.c                            |   2 +-
 net/bridge/br_input.c                         |   2 +-
 net/bridge/br_netlink.c                       |   8 +-
 net/bridge/br_private.h                       |   5 +-
 net/bridge/br_vlan.c                          |   1 +
 net/bridge/br_vlan_options.c                  |  20 +-
 net/core/rtnetlink.c                          |   2 +-
 tools/testing/selftests/net/Makefile          |   1 +
 .../net/test_bridge_neigh_suppress.sh         | 862 ++++++++++++++++++
 15 files changed, 936 insertions(+), 19 deletions(-)
 create mode 100755 tools/testing/selftests/net/test_bridge_neigh_suppress.sh

-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 1/9] bridge: Reorder neighbor suppression check when flooding

The bridge does not flood ARP / NS packets for which a reply was sent to
bridge ports that have neighbor suppression enabled.

Subsequent patches are going to add per-{Port, VLAN} neighbor
suppression, which is going to make it more expensive to check whether
neighbor suppression is enabled since a VLAN lookup will be required.

Therefore, instead of unnecessarily performing this lookup for every
packet, only perform it for ARP / NS packets for which a reply was sent.

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 net/bridge/br_forward.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 02bb620d3b8d..0fe133fa214c 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -224,8 +224,8 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
 		/* Do not flood to ports that enable proxy ARP */
 		if (p->flags & BR_PROXYARP)
 			continue;
-		if ((p->flags & (BR_PROXYARP_WIFI | BR_NEIGH_SUPPRESS)) &&
-		    BR_INPUT_SKB_CB(skb)->proxyarp_replied)
+		if (BR_INPUT_SKB_CB(skb)->proxyarp_replied &&
+		    (p->flags & (BR_PROXYARP_WIFI | BR_NEIGH_SUPPRESS)))
 			continue;
 
 		prev = maybe_deliver(prev, p, skb, local_orig);
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 2/9] bridge: Pass VLAN ID to br_flood()

Subsequent patches are going to add per-{Port, VLAN} neighbor
suppression, which will require br_flood() to potentially suppress ARP /
NS packets on a per-{Port, VLAN} basis.

As a preparation, pass the VLAN ID of the packet as another argument to
br_flood().

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 net/bridge/br_device.c  | 8 ++++----
 net/bridge/br_forward.c | 3 ++-
 net/bridge/br_input.c   | 2 +-
 net/bridge/br_private.h | 3 ++-
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index df47c876230e..8eca8a5c80c6 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -80,10 +80,10 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct
net_device *dev)
 
 	dest = eth_hdr(skb)->h_dest;
 	if (is_broadcast_ether_addr(dest)) {
-		br_flood(br, skb, BR_PKT_BROADCAST, false, true);
+		br_flood(br, skb, BR_PKT_BROADCAST, false, true, vid);
 	} else if (is_multicast_ether_addr(dest)) {
 		if (unlikely(netpoll_tx_running(dev))) {
-			br_flood(br, skb, BR_PKT_MULTICAST, false, true);
+			br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
 			goto out;
 		}
 		if (br_multicast_rcv(&brmctx, &pmctx_null, vlan, skb, vid)) {
@@ -96,11 +96,11 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct
net_device *dev)
 		    br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
 			br_multicast_flood(mdst, skb, brmctx, false, true);
 		else
-			br_flood(br, skb, BR_PKT_MULTICAST, false, true);
+			br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
 	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
 		br_forward(dst->dst, skb, false, true);
 	} else {
-		br_flood(br, skb, BR_PKT_UNICAST, false, true);
+		br_flood(br, skb, BR_PKT_UNICAST, false, true, vid);
 	}
 out:
 	rcu_read_unlock();
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 0fe133fa214c..94a8d757ae4e 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -197,7 +197,8 @@ static struct net_bridge_port *maybe_deliver(
 
 /* called under rcu_read_lock */
 void br_flood(struct net_bridge *br, struct sk_buff *skb,
-	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
+	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig,
+	      u16 vid)
 {
 	struct net_bridge_port *prev = NULL;
 	struct net_bridge_port *p;
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 3027e8f6be15..fc17b9fd93e6 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -207,7 +207,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk,
struct sk_buff *skb
 		br_forward(dst->dst, skb, local_rcv, false);
 	} else {
 		if (!mcast_hit)
-			br_flood(br, skb, pkt_type, local_rcv, false);
+			br_flood(br, skb, pkt_type, local_rcv, false, vid);
 		else
 			br_multicast_flood(mdst, skb, brmctx, local_rcv, false);
 	}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 7264fd40f82f..1ff4d64ab584 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -849,7 +849,8 @@ void br_forward(const struct net_bridge_port *to, struct
sk_buff *skb,
 		bool local_rcv, bool local_orig);
 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 void br_flood(struct net_bridge *br, struct sk_buff *skb,
-	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
+	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig,
+	      u16 vid);
 
 /* return true if both source port and dest port are isolated */
 static inline bool br_skb_isolated(const struct net_bridge_port *to,
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 3/9] bridge: Add internal flags for per-{Port, VLAN} neighbor suppression

Add two internal flags that will be used to enable / disable per-{Port,
VLAN} neighbor suppression:

1. 'BR_NEIGH_VLAN_SUPPRESS': A per-port flag used to indicate that
per-{Port, VLAN} neighbor suppression is enabled on the bridge port.
When set, 'BR_NEIGH_SUPPRESS' has no effect.

2. 'BR_VLFLAG_NEIGH_SUPPRESS_ENABLED': A per-VLAN flag used to indicate
that neighbor suppression is enabled on the given VLAN.

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 include/linux/if_bridge.h | 1 +
 net/bridge/br_private.h   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index 1668ac4d7adc..3ff96ae31bf6 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -60,6 +60,7 @@ struct br_ip_list {
 #define BR_TX_FWD_OFFLOAD	BIT(20)
 #define BR_PORT_LOCKED		BIT(21)
 #define BR_PORT_MAB		BIT(22)
+#define BR_NEIGH_VLAN_SUPPRESS	BIT(23)
 
 #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1ff4d64ab584..b17fc821ecc8 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -178,6 +178,7 @@ enum {
 	BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
 	BR_VLFLAG_MCAST_ENABLED = BIT(2),
 	BR_VLFLAG_GLOBAL_MCAST_ENABLED = BIT(3),
+	BR_VLFLAG_NEIGH_SUPPRESS_ENABLED = BIT(4),
 };
 
 /**
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 4/9] bridge: Take per-{Port, VLAN} neighbor suppression into account

The bridge driver gates the neighbor suppression code behind an internal
per-bridge flag called 'BROPT_NEIGH_SUPPRESS_ENABLED'. The flag is set
when at least one bridge port has neighbor suppression enabled.

As a preparation for per-{Port, VLAN} neighbor suppression, make sure
the global flag is also set if per-{Port, VLAN} neighbor suppression is
enabled. That is, when the 'BR_NEIGH_VLAN_SUPPRESS' flag is set on at
least one bridge port.

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 net/bridge/br_arp_nd_proxy.c | 2 +-
 net/bridge/br_if.c           | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c
index b45c00c01dea..016a25a9e444 100644
--- a/net/bridge/br_arp_nd_proxy.c
+++ b/net/bridge/br_arp_nd_proxy.c
@@ -30,7 +30,7 @@ void br_recalculate_neigh_suppress_enabled(struct net_bridge
*br)
 	bool neigh_suppress = false;
 
 	list_for_each_entry(p, &br->port_list, list) {
-		if (p->flags & BR_NEIGH_SUPPRESS) {
+		if (p->flags & (BR_NEIGH_SUPPRESS | BR_NEIGH_VLAN_SUPPRESS)) {
 			neigh_suppress = true;
 			break;
 		}
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 24f01ff113f0..3f04b40f6056 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -759,7 +759,7 @@ void br_port_flags_change(struct net_bridge_port *p,
unsigned long mask)
 	if (mask & BR_AUTO_MASK)
 		nbp_update_port_count(br);
 
-	if (mask & BR_NEIGH_SUPPRESS)
+	if (mask & (BR_NEIGH_SUPPRESS | BR_NEIGH_VLAN_SUPPRESS))
 		br_recalculate_neigh_suppress_enabled(br);
 }
 
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 5/9] bridge: Encapsulate data path neighbor suppression logic

Currently, there are various places in the bridge data path that check
whether neighbor suppression is enabled on a given bridge port.

As a preparation for per-{Port, VLAN} neighbor suppression, encapsulate
this logic in a function and pass the VLAN ID of the packet as an
argument.

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 net/bridge/br_arp_nd_proxy.c | 15 ++++++++++-----
 net/bridge/br_forward.c      |  3 ++-
 net/bridge/br_private.h      |  1 +
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c
index 016a25a9e444..16c3a1c5d0ae 100644
--- a/net/bridge/br_arp_nd_proxy.c
+++ b/net/bridge/br_arp_nd_proxy.c
@@ -158,7 +158,7 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct
net_bridge *br,
 		return;
 
 	if (br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
-		if (p && (p->flags & BR_NEIGH_SUPPRESS))
+		if (br_is_neigh_suppress_enabled(p, vid))
 			return;
 		if (parp->ar_op != htons(ARPOP_RREQUEST) &&
 		    parp->ar_op != htons(ARPOP_RREPLY) &&
@@ -202,8 +202,8 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct
net_bridge *br,
 			bool replied = false;
 
 			if ((p && (p->flags & BR_PROXYARP)) ||
-			    (f->dst && (f->dst->flags & (BR_PROXYARP_WIFI |
-							 BR_NEIGH_SUPPRESS)))) {
+			    (f->dst && (f->dst->flags & BR_PROXYARP_WIFI)) ||
+			    br_is_neigh_suppress_enabled(f->dst, vid)) {
 				if (!vid)
 					br_arp_send(br, p, skb->dev, sip, tip,
 						    sha, n->ha, sha, 0, 0);
@@ -407,7 +407,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct
net_bridge *br,
 
 	BR_INPUT_SKB_CB(skb)->proxyarp_replied = 0;
 
-	if (p && (p->flags & BR_NEIGH_SUPPRESS))
+	if (br_is_neigh_suppress_enabled(p, vid))
 		return;
 
 	if (msg->icmph.icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT &&
@@ -461,7 +461,7 @@ void br_do_suppress_nd(struct sk_buff *skb, struct
net_bridge *br,
 		if (f) {
 			bool replied = false;
 
-			if (f->dst && (f->dst->flags & BR_NEIGH_SUPPRESS)) {
+			if (br_is_neigh_suppress_enabled(f->dst, vid)) {
 				if (vid != 0)
 					br_nd_send(br, p, skb, n,
 						   skb->vlan_proto,
@@ -483,3 +483,8 @@ void br_do_suppress_nd(struct sk_buff *skb, struct
net_bridge *br,
 	}
 }
 #endif
+
+bool br_is_neigh_suppress_enabled(const struct net_bridge_port *p, u16 vid)
+{
+	return p && (p->flags & BR_NEIGH_SUPPRESS);
+}
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 94a8d757ae4e..57744704ff69 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -226,7 +226,8 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
 		if (p->flags & BR_PROXYARP)
 			continue;
 		if (BR_INPUT_SKB_CB(skb)->proxyarp_replied &&
-		    (p->flags & (BR_PROXYARP_WIFI | BR_NEIGH_SUPPRESS)))
+		    ((p->flags & BR_PROXYARP_WIFI) ||
+		     br_is_neigh_suppress_enabled(p, vid)))
 			continue;
 
 		prev = maybe_deliver(prev, p, skb, local_orig);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index b17fc821ecc8..2119729ded2b 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -2220,4 +2220,5 @@ void br_do_proxy_suppress_arp(struct sk_buff *skb, struct
net_bridge *br,
 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
 		       u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
+bool br_is_neigh_suppress_enabled(const struct net_bridge_port *p, u16 vid);
 #endif
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 6/9] bridge: Add per-{Port, VLAN} neighbor suppression data path support

When the bridge is not VLAN-aware (i.e., VLAN ID is 0), determine if
neighbor suppression is enabled on a given bridge port solely based on
the existing 'BR_NEIGH_SUPPRESS' flag.

Otherwise, if the bridge is VLAN-aware, first check if per-{Port, VLAN}
neighbor suppression is enabled on the given bridge port using the
'BR_NEIGH_VLAN_SUPPRESS' flag. If so, look up the VLAN and check whether
it has neighbor suppression enabled based on the per-VLAN
'BR_VLFLAG_NEIGH_SUPPRESS_ENABLED' flag.

If the bridge is VLAN-aware, but the bridge port does not have
per-{Port, VLAN} neighbor suppression enabled, then fallback to
determine neighbor suppression based on the 'BR_NEIGH_SUPPRESS' flag.

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 net/bridge/br_arp_nd_proxy.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_arp_nd_proxy.c b/net/bridge/br_arp_nd_proxy.c
index 16c3a1c5d0ae..c7869a286df4 100644
--- a/net/bridge/br_arp_nd_proxy.c
+++ b/net/bridge/br_arp_nd_proxy.c
@@ -486,5 +486,21 @@ void br_do_suppress_nd(struct sk_buff *skb, struct
net_bridge *br,
 
 bool br_is_neigh_suppress_enabled(const struct net_bridge_port *p, u16 vid)
 {
-	return p && (p->flags & BR_NEIGH_SUPPRESS);
+	if (!p)
+		return false;
+
+	if (!vid)
+		return !!(p->flags & BR_NEIGH_SUPPRESS);
+
+	if (p->flags & BR_NEIGH_VLAN_SUPPRESS) {
+		struct net_bridge_vlan_group *vg = nbp_vlan_group_rcu(p);
+		struct net_bridge_vlan *v;
+
+		v = br_vlan_find(vg, vid);
+		if (!v)
+			return false;
+		return !!(v->priv_flags & BR_VLFLAG_NEIGH_SUPPRESS_ENABLED);
+	} else {
+		return !!(p->flags & BR_NEIGH_SUPPRESS);
+	}
 }
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 7/9] bridge: vlan: Allow setting VLAN neighbor suppression state

Add a new VLAN attribute that allows user space to set the neighbor
suppression state of the port VLAN. Example:

 # bridge -d -j -p vlan show dev swp1 vid 10 | jq
'.[]["vlans"][]["neigh_suppress"]'
 false
 # bridge vlan set vid 10 dev swp1 neigh_suppress on
 # bridge -d -j -p vlan show dev swp1 vid 10 | jq
'.[]["vlans"][]["neigh_suppress"]'
 true
 # bridge vlan set vid 10 dev swp1 neigh_suppress off
 # bridge -d -j -p vlan show dev swp1 vid 10 | jq
'.[]["vlans"][]["neigh_suppress"]'
 false

 # bridge vlan set vid 10 dev br0 neigh_suppress on
 Error: bridge: Can't set neigh_suppress for non-port vlans.

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 include/uapi/linux/if_bridge.h |  1 +
 net/bridge/br_vlan.c           |  1 +
 net/bridge/br_vlan_options.c   | 20 +++++++++++++++++++-
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index c9d624f528c5..f95326fce6bb 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -525,6 +525,7 @@ enum {
 	BRIDGE_VLANDB_ENTRY_MCAST_ROUTER,
 	BRIDGE_VLANDB_ENTRY_MCAST_N_GROUPS,
 	BRIDGE_VLANDB_ENTRY_MCAST_MAX_GROUPS,
+	BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS,
 	__BRIDGE_VLANDB_ENTRY_MAX,
 };
 #define BRIDGE_VLANDB_ENTRY_MAX (__BRIDGE_VLANDB_ENTRY_MAX - 1)
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 8a3dbc09ba38..15f44d026e75 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -2134,6 +2134,7 @@ static const struct nla_policy
br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1]  
[BRIDGE_VLANDB_ENTRY_MCAST_ROUTER]	= { .type = NLA_U8 },
 	[BRIDGE_VLANDB_ENTRY_MCAST_N_GROUPS]	= { .type = NLA_REJECT },
 	[BRIDGE_VLANDB_ENTRY_MCAST_MAX_GROUPS]	= { .type = NLA_U32 },
+	[BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS]	= NLA_POLICY_MAX(NLA_U8, 1),
 };
 
 static int br_vlan_rtm_process_one(struct net_device *dev,
diff --git a/net/bridge/br_vlan_options.c b/net/bridge/br_vlan_options.c
index e378c2f3a9e2..8fa89b04ee94 100644
--- a/net/bridge/br_vlan_options.c
+++ b/net/bridge/br_vlan_options.c
@@ -52,7 +52,9 @@ bool br_vlan_opts_fill(struct sk_buff *skb, const struct
net_bridge_vlan *v,
 		       const struct net_bridge_port *p)
 {
 	if (nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_STATE, br_vlan_get_state(v)) ||
-	    !__vlan_tun_put(skb, v))
+	    !__vlan_tun_put(skb, v) ||
+	    nla_put_u8(skb, BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS,
+		       !!(v->priv_flags & BR_VLFLAG_NEIGH_SUPPRESS_ENABLED)))
 		return false;
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
@@ -80,6 +82,7 @@ size_t br_vlan_opts_nl_size(void)
 	       + nla_total_size(sizeof(u32)) /* BRIDGE_VLANDB_ENTRY_MCAST_N_GROUPS */
 	       + nla_total_size(sizeof(u32)) /* BRIDGE_VLANDB_ENTRY_MCAST_MAX_GROUPS
*/
 #endif
+	       + nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS */
 	       + 0;
 }
 
@@ -239,6 +242,21 @@ static int br_vlan_process_one_opts(const struct net_bridge
*br,
 	}
 #endif
 
+	if (tb[BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS]) {
+		bool enabled = v->priv_flags & BR_VLFLAG_NEIGH_SUPPRESS_ENABLED;
+		bool val = nla_get_u8(tb[BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS]);
+
+		if (!p) {
+			NL_SET_ERR_MSG_MOD(extack, "Can't set neigh_suppress for non-port
vlans");
+			return -EINVAL;
+		}
+
+		if (val != enabled) {
+			v->priv_flags ^= BR_VLFLAG_NEIGH_SUPPRESS_ENABLED;
+			*changed = true;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 8/9] bridge: Allow setting per-{Port, VLAN} neighbor suppression state

Add a new bridge port attribute that allows user space to enable
per-{Port, VLAN} neighbor suppression. Example:

 # bridge -d -j -p link show dev swp1 | jq
'.[]["neigh_vlan_suppress"]'
 false
 # bridge link set dev swp1 neigh_vlan_suppress on
 # bridge -d -j -p link show dev swp1 | jq
'.[]["neigh_vlan_suppress"]'
 true
 # bridge link set dev swp1 neigh_vlan_suppress off
 # bridge -d -j -p link show dev swp1 | jq
'.[]["neigh_vlan_suppress"]'
 false

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 include/uapi/linux/if_link.h | 1 +
 net/bridge/br_netlink.c      | 8 +++++++-
 net/core/rtnetlink.c         | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 8d679688efe0..4ac1000b0ef2 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -569,6 +569,7 @@ enum {
 	IFLA_BRPORT_MAB,
 	IFLA_BRPORT_MCAST_N_GROUPS,
 	IFLA_BRPORT_MCAST_MAX_GROUPS,
+	IFLA_BRPORT_NEIGH_VLAN_SUPPRESS,
 	__IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index fefb1c0e248b..05c5863d2e20 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -189,6 +189,7 @@ static inline size_t br_port_info_size(void)
 		+ nla_total_size(1)	/* IFLA_BRPORT_ISOLATED */
 		+ nla_total_size(1)	/* IFLA_BRPORT_LOCKED */
 		+ nla_total_size(1)	/* IFLA_BRPORT_MAB */
+		+ nla_total_size(1)	/* IFLA_BRPORT_NEIGH_VLAN_SUPPRESS */
 		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_ROOT_ID */
 		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_BRIDGE_ID */
 		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_DESIGNATED_PORT */
@@ -278,7 +279,9 @@ static int br_port_fill_attrs(struct sk_buff *skb,
 		       !!(p->flags & BR_MRP_LOST_IN_CONT)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED))
||
 	    nla_put_u8(skb, IFLA_BRPORT_LOCKED, !!(p->flags & BR_PORT_LOCKED))
||
-	    nla_put_u8(skb, IFLA_BRPORT_MAB, !!(p->flags & BR_PORT_MAB)))
+	    nla_put_u8(skb, IFLA_BRPORT_MAB, !!(p->flags & BR_PORT_MAB)) ||
+	    nla_put_u8(skb, IFLA_BRPORT_NEIGH_VLAN_SUPPRESS,
+		       !!(p->flags & BR_NEIGH_VLAN_SUPPRESS)))
 		return -EMSGSIZE;
 
 	timerval = br_timer_value(&p->message_age_timer);
@@ -891,6 +894,7 @@ static const struct nla_policy
br_port_policy[IFLA_BRPORT_MAX + 1] = {
 	[IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT] = { .type = NLA_U32 },
 	[IFLA_BRPORT_MCAST_N_GROUPS] = { .type = NLA_REJECT },
 	[IFLA_BRPORT_MCAST_MAX_GROUPS] = { .type = NLA_U32 },
+	[IFLA_BRPORT_NEIGH_VLAN_SUPPRESS] = NLA_POLICY_MAX(NLA_U8, 1),
 };
 
 /* Change the state of the port and notify spanning tree */
@@ -957,6 +961,8 @@ static int br_setport(struct net_bridge_port *p, struct
nlattr *tb[],
 	br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
 	br_set_port_flag(p, tb, IFLA_BRPORT_LOCKED, BR_PORT_LOCKED);
 	br_set_port_flag(p, tb, IFLA_BRPORT_MAB, BR_PORT_MAB);
+	br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_VLAN_SUPPRESS,
+			 BR_NEIGH_VLAN_SUPPRESS);
 
 	if ((p->flags & BR_PORT_MAB) &&
 	    (!(p->flags & BR_PORT_LOCKED) || !(p->flags & BR_LEARNING)))
{
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 906aebdc566b..f522e8c4fcd5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -61,7 +61,7 @@
 #include "dev.h"
 
 #define RTNL_MAX_TYPE		50
-#define RTNL_SLAVE_MAX_TYPE	42
+#define RTNL_SLAVE_MAX_TYPE	43
 
 struct rtnl_link {
 	rtnl_doit_func		doit;
-- 
2.37.3

Ido Schimmel

2023-Apr-13 09:58 UTC

head link

[Bridge] [RFC PATCH net-next 9/9] selftests: net: Add bridge neighbor suppression test

Add test cases for bridge neighbor suppression, testing both per-port
and per-{Port, VLAN} neighbor suppression with both ARP and NS packets.

Example truncated output:

 # ./test_bridge_neigh_suppress.sh
 [...]
 Tests passed: 148
 Tests failed:   0

Signed-off-by: Ido Schimmel <idosch at nvidia.com>
---
 tools/testing/selftests/net/Makefile          |   1 +
 .../net/test_bridge_neigh_suppress.sh         | 862 ++++++++++++++++++
 2 files changed, 863 insertions(+)
 create mode 100755 tools/testing/selftests/net/test_bridge_neigh_suppress.sh

diff --git a/tools/testing/selftests/net/Makefile
b/tools/testing/selftests/net/Makefile
index 1de34ec99290..c12df57d5539 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -83,6 +83,7 @@ TEST_GEN_FILES += nat6to4.o
 TEST_GEN_FILES += ip_local_port_range
 TEST_GEN_FILES += bind_wildcard
 TEST_PROGS += test_vxlan_mdb.sh
+TEST_PROGS += test_bridge_neigh_suppress.sh
 
 TEST_FILES := settings
 
diff --git a/tools/testing/selftests/net/test_bridge_neigh_suppress.sh
b/tools/testing/selftests/net/test_bridge_neigh_suppress.sh
new file mode 100755
index 000000000000..d80f2cd87614
--- /dev/null
+++ b/tools/testing/selftests/net/test_bridge_neigh_suppress.sh
@@ -0,0 +1,862 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# This test is for checking bridge neighbor suppression functionality. The
+# topology consists of two bridges (VTEPs) connected using VXLAN. A single
+# host is connected to each bridge over multiple VLANs. The test checks that
+# ARP/NS messages from the first host are suppressed on the VXLAN port when
+# should.
+#
+# +-----------------------+              +------------------------+
+# | h1                    |              | h2                     |
+# |                       |              |                        |
+# | + eth0.10             |              | + eth0.10              |
+# | | 192.0.2.1/28        |              | | 192.0.2.2/28         |
+# | | 2001:db8:1::1/64    |              | | 2001:db8:1::2/64     |
+# | |                     |              | |                      |
+# | |  + eth0.20          |              | |  + eth0.20           |
+# | \  | 192.0.2.17/28    |              | \  | 192.0.2.18/28     |
+# |  \ | 2001:db8:2::1/64 |              |  \ | 2001:db8:2::2/64  |
+# |   \|                  |              |   \|                   |
+# |    + eth0             |              |    + eth0              |
+# +----|------------------+              +----|-------------------+
+#      |                                      |
+#      |                                      |
+# +----|-------------------------------+ +----|-------------------------------+
+# |    + swp1                   + vx0  | |    + swp1                   + vx0  |
+# |    |                        |      | |    |                        |      |
+# |    |           br0          |      | |    |                        |      |
+# |    +------------+-----------+      | |    +------------+-----------+      |
+# |                 |                  | |                 |                  |
+# |                 |                  | |                 |                  |
+# |             +---+---+              | |             +---+---+              |
+# |             |       |              | |             |       |              |
+# |             |       |              | |             |       |              |
+# |             +       +              | |             +       +              |
+# |          br0.10  br0.20            | |          br0.10  br0.20            |
+# |                                    | |                                    |
+# |                 192.0.2.33         | |                 192.0.2.34         |
+# |                 + lo               | |                 + lo               |
+# |                                    | |                                    |
+# |                                    | |                                    |
+# |                   192.0.2.49/28    | |    192.0.2.50/28                   |
+# |                           veth0 +-------+ veth0                           |
+# |                                    | |                                    |
+# | sw1                                | | sw2                                |
+# +------------------------------------+ +------------------------------------+
+
+ret=0
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+# All tests in this script. Can be overridden with -t option.
+TESTS="
+	neigh_suppress_arp
+	neigh_suppress_ns
+	neigh_vlan_suppress_arp
+	neigh_vlan_suppress_ns
+"
+VERBOSE=0
+PAUSE_ON_FAIL=no
+PAUSE=no
+
+################################################################################
+# Utilities
+
+log_test()
+{
+	local rc=$1
+	local expected=$2
+	local msg="$3"
+
+	if [ ${rc} -eq ${expected} ]; then
+		printf "TEST: %-60s  [ OK ]\n" "${msg}"
+		nsuccess=$((nsuccess+1))
+	else
+		ret=1
+		nfail=$((nfail+1))
+		printf "TEST: %-60s  [FAIL]\n" "${msg}"
+		if [ "$VERBOSE" = "1" ]; then
+			echo "    rc=$rc, expected $expected"
+		fi
+
+		if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+		echo
+			echo "hit enter to continue, 'q' to quit"
+			read a
+			[ "$a" = "q" ] && exit 1
+		fi
+	fi
+
+	if [ "${PAUSE}" = "yes" ]; then
+		echo
+		echo "hit enter to continue, 'q' to quit"
+		read a
+		[ "$a" = "q" ] && exit 1
+	fi
+
+	[ "$VERBOSE" = "1" ] && echo
+}
+
+run_cmd()
+{
+	local cmd="$1"
+	local out
+	local stderr="2>/dev/null"
+
+	if [ "$VERBOSE" = "1" ]; then
+		printf "COMMAND: $cmd\n"
+		stderr+	fi
+
+	out=$(eval $cmd $stderr)
+	rc=$?
+	if [ "$VERBOSE" = "1" -a -n "$out" ]; then
+		echo "    $out"
+	fi
+
+	return $rc
+}
+
+tc_check_packets()
+{
+	local ns=$1; shift
+	local id=$1; shift
+	local handle=$1; shift
+	local count=$1; shift
+	local pkts
+
+	sleep 0.1
+	pkts=$(tc -n $ns -j -s filter show $id \
+		| jq ".[] | select(.options.handle == $handle) | \
+		.options.actions[0].stats.packets")
+	[[ $pkts == $count ]]
+}
+
+################################################################################
+# Setup
+
+setup_topo_ns()
+{
+	local ns=$1; shift
+
+	ip netns add $ns
+	ip -n $ns link set dev lo up
+
+	ip netns exec $ns sysctl -qw net.ipv6.conf.all.keep_addr_on_down=1
+	ip netns exec $ns sysctl -qw
net.ipv6.conf.default.ignore_routes_with_linkdown=1
+	ip netns exec $ns sysctl -qw net.ipv6.conf.all.accept_dad=0
+	ip netns exec $ns sysctl -qw net.ipv6.conf.default.accept_dad=0
+}
+
+setup_topo()
+{
+	local ns
+
+	for ns in h1 h2 sw1 sw2; do
+		setup_topo_ns $ns
+	done
+
+	ip link add name veth0 type veth peer name veth1
+	ip link set dev veth0 netns h1 name eth0
+	ip link set dev veth1 netns sw1 name swp1
+
+	ip link add name veth0 type veth peer name veth1
+	ip link set dev veth0 netns sw1 name veth0
+	ip link set dev veth1 netns sw2 name veth0
+
+	ip link add name veth0 type veth peer name veth1
+	ip link set dev veth0 netns h2 name eth0
+	ip link set dev veth1 netns sw2 name swp1
+}
+
+setup_host_common()
+{
+	local ns=$1; shift
+	local v4addr1=$1; shift
+	local v4addr2=$1; shift
+	local v6addr1=$1; shift
+	local v6addr2=$1; shift
+
+	ip -n $ns link set dev eth0 up
+	ip -n $ns link add link eth0 name eth0.10 up type vlan id 10
+	ip -n $ns link add link eth0 name eth0.20 up type vlan id 20
+
+	ip -n $ns address add $v4addr1 dev eth0.10
+	ip -n $ns address add $v4addr2 dev eth0.20
+	ip -n $ns address add $v6addr1 dev eth0.10
+	ip -n $ns address add $v6addr2 dev eth0.20
+}
+
+setup_h1()
+{
+	local ns=h1
+	local v4addr1=192.0.2.1/28
+	local v4addr2=192.0.2.17/28
+	local v6addr1=2001:db8:1::1/64
+	local v6addr2=2001:db8:2::1/64
+
+	setup_host_common $ns $v4addr1 $v4addr2 $v6addr1 $v6addr2
+}
+
+setup_h2()
+{
+	local ns=h2
+	local v4addr1=192.0.2.2/28
+	local v4addr2=192.0.2.18/28
+	local v6addr1=2001:db8:1::2/64
+	local v6addr2=2001:db8:2::2/64
+
+	setup_host_common $ns $v4addr1 $v4addr2 $v6addr1 $v6addr2
+}
+
+setup_sw_common()
+{
+	local ns=$1; shift
+	local local_addr=$1; shift
+	local remote_addr=$1; shift
+	local veth_addr=$1; shift
+	local gw_addr=$1; shift
+
+	ip -n $ns address add $local_addr/32 dev lo
+
+	ip -n $ns link set dev veth0 up
+	ip -n $ns address add $veth_addr/28 dev veth0
+	ip -n $ns route add default via $gw_addr
+
+	ip -n $ns link add name br0 up type bridge vlan_filtering 1 \
+		vlan_default_pvid 0 mcast_snooping 0
+
+	ip -n $ns link add link br0 name br0.10 up type vlan id 10
+	bridge -n $ns vlan add vid 10 dev br0 self
+
+	ip -n $ns link add link br0 name br0.20 up type vlan id 20
+	bridge -n $ns vlan add vid 20 dev br0 self
+
+	ip -n $ns link set dev swp1 up master br0
+	bridge -n $ns vlan add vid 10 dev swp1
+	bridge -n $ns vlan add vid 20 dev swp1
+
+	ip -n $ns link add name vx0 up master br0 type vxlan \
+		local $local_addr dstport 4789 nolearning external
+	bridge -n $ns fdb add 00:00:00:00:00:00 dev vx0 self static \
+		dst $remote_addr src_vni 10010
+	bridge -n $ns fdb add 00:00:00:00:00:00 dev vx0 self static \
+		dst $remote_addr src_vni 10020
+	bridge -n $ns link set dev vx0 vlan_tunnel on learning off
+
+	bridge -n $ns vlan add vid 10 dev vx0
+	bridge -n $ns vlan add vid 10 dev vx0 tunnel_info id 10010
+
+	bridge -n $ns vlan add vid 20 dev vx0
+	bridge -n $ns vlan add vid 20 dev vx0 tunnel_info id 10020
+}
+
+setup_sw1()
+{
+	local ns=sw1
+	local local_addr=192.0.2.33
+	local remote_addr=192.0.2.34
+	local veth_addr=192.0.2.49
+	local gw_addr=192.0.2.50
+
+	setup_sw_common $ns $local_addr $remote_addr $veth_addr $gw_addr
+}
+
+setup_sw2()
+{
+	local ns=sw2
+	local local_addr=192.0.2.34
+	local remote_addr=192.0.2.33
+	local veth_addr=192.0.2.50
+	local gw_addr=192.0.2.49
+
+	setup_sw_common $ns $local_addr $remote_addr $veth_addr $gw_addr
+}
+
+setup()
+{
+	set -e
+
+	setup_topo
+	setup_h1
+	setup_h2
+	setup_sw1
+	setup_sw2
+
+	sleep 5
+
+	set +e
+}
+
+cleanup()
+{
+	local ns
+
+	for ns in h1 h2 sw1 sw2; do
+		ip netns del $ns &> /dev/null
+	done
+}
+
+################################################################################
+# Tests
+
+neigh_suppress_arp_common()
+{
+	local vid=$1; shift
+	local sip=$1; shift
+	local tip=$1; shift
+	local h2_mac
+
+	echo
+	echo "Per-port ARP suppression - VLAN $vid"
+	echo "----------------------------------"
+
+	run_cmd "tc -n sw1 qdisc replace dev vx0 clsact"
+	run_cmd "tc -n sw1 filter replace dev vx0 egress pref 1 handle 101 proto
0x0806 flower indev swp1 arp_tip $tip arp_sip $sip arp_op request action
pass"
+
+	# Initial state - check that ARP requests are not suppressed and that
+	# ARP replies are received.
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 0 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "ARP suppression"
+
+	# Enable neighbor suppression and check that nothing changes compared
+	# to the initial state.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
on\""
+	log_test $? 0 "\"neigh_suppress\" is on"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 0 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 2
+	log_test $? 0 "ARP suppression"
+
+	# Install an FDB entry for the remote host and check that nothing
+	# changes compared to the initial state.
+	h2_mac=$(ip -n h2 -j -p link show eth0.$vid | jq -r
'.[]["address"]')
+	run_cmd "bridge -n sw1 fdb replace $h2_mac dev vx0 master static vlan
$vid"
+	log_test $? 0 "FDB entry installation"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 0 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 3
+	log_test $? 0 "ARP suppression"
+
+	# Install a neighbor on the matching SVI interface and check that ARP
+	# requests are suppressed.
+	run_cmd "ip -n sw1 neigh replace $tip lladdr $h2_mac nud permanent dev
br0.$vid"
+	log_test $? 0 "Neighbor entry installation"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 0 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 3
+	log_test $? 0 "ARP suppression"
+
+	# Take the second host down and check that ARP requests are suppressed
+	# and that ARP replies are received.
+	run_cmd "ip -n h2 link set dev eth0.$vid down"
+	log_test $? 0 "H2 down"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 0 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 3
+	log_test $? 0 "ARP suppression"
+
+	run_cmd "ip -n h2 link set dev eth0.$vid up"
+	log_test $? 0 "H2 up"
+
+	# Disable neighbor suppression and check that ARP requests are no
+	# longer suppressed.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress off"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
off\""
+	log_test $? 0 "\"neigh_suppress\" is off"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 0 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 4
+	log_test $? 0 "ARP suppression"
+
+	# Take the second host down and check that ARP requests are not
+	# suppressed and that ARP replies are not received.
+	run_cmd "ip -n h2 link set dev eth0.$vid down"
+	log_test $? 0 "H2 down"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip -I eth0.$vid
$tip"
+	log_test $? 1 "arping"
+	tc_check_packets sw1 "dev vx0 egress" 101 5
+	log_test $? 0 "ARP suppression"
+}
+
+neigh_suppress_arp()
+{
+	local vid=10
+	local sip=192.0.2.1
+	local tip=192.0.2.2
+
+	neigh_suppress_arp_common $vid $sip $tip
+
+	vid=20
+	sip=192.0.2.17
+	tip=192.0.2.18
+	neigh_suppress_arp_common $vid $sip $tip
+}
+
+neigh_suppress_ns_common()
+{
+	local vid=$1; shift
+	local saddr=$1; shift
+	local daddr=$1; shift
+	local maddr=$1; shift
+	local h2_mac
+
+	echo
+	echo "Per-port NS suppression - VLAN $vid"
+	echo "---------------------------------"
+
+	run_cmd "tc -n sw1 qdisc replace dev vx0 clsact"
+	run_cmd "tc -n sw1 filter replace dev vx0 egress pref 1 handle 101 proto
ipv6 flower indev swp1 ip_proto icmpv6 dst_ip $maddr src_ip $saddr type 135 code
0 action pass"
+
+	# Initial state - check that NS messages are not suppressed and that ND
+	# messages are received.
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 0 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "NS suppression"
+
+	# Enable neighbor suppression and check that nothing changes compared
+	# to the initial state.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
on\""
+	log_test $? 0 "\"neigh_suppress\" is on"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 0 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 2
+	log_test $? 0 "NS suppression"
+
+	# Install an FDB entry for the remote host and check that nothing
+	# changes compared to the initial state.
+	h2_mac=$(ip -n h2 -j -p link show eth0.$vid | jq -r
'.[]["address"]')
+	run_cmd "bridge -n sw1 fdb replace $h2_mac dev vx0 master static vlan
$vid"
+	log_test $? 0 "FDB entry installation"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 0 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 3
+	log_test $? 0 "NS suppression"
+
+	# Install a neighbor on the matching SVI interface and check that NS
+	# messages are suppressed.
+	run_cmd "ip -n sw1 neigh replace $daddr lladdr $h2_mac nud permanent dev
br0.$vid"
+	log_test $? 0 "Neighbor entry installation"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 0 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 3
+	log_test $? 0 "NS suppression"
+
+	# Take the second host down and check that NS messages are suppressed
+	# and that ND messages are received.
+	run_cmd "ip -n h2 link set dev eth0.$vid down"
+	log_test $? 0 "H2 down"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 0 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 3
+	log_test $? 0 "NS suppression"
+
+	run_cmd "ip -n h2 link set dev eth0.$vid up"
+	log_test $? 0 "H2 up"
+
+	# Disable neighbor suppression and check that NS messages are no longer
+	# suppressed.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress off"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
off\""
+	log_test $? 0 "\"neigh_suppress\" is off"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 0 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 4
+	log_test $? 0 "NS suppression"
+
+	# Take the second host down and check that NS messages are not
+	# suppressed and that ND messages are not received.
+	run_cmd "ip -n h2 link set dev eth0.$vid down"
+	log_test $? 0 "H2 down"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr -w 5000 $daddr
eth0.$vid"
+	log_test $? 2 "ndisc6"
+	tc_check_packets sw1 "dev vx0 egress" 101 5
+	log_test $? 0 "NS suppression"
+}
+
+neigh_suppress_ns()
+{
+	local vid=10
+	local saddr=2001:db8:1::1
+	local daddr=2001:db8:1::2
+	local maddr=ff02::1:ff00:2
+
+	neigh_suppress_ns_common $vid $saddr $daddr $maddr
+
+	vid=20
+	saddr=2001:db8:2::1
+	daddr=2001:db8:2::2
+	maddr=ff02::1:ff00:2
+
+	neigh_suppress_ns_common $vid $saddr $daddr $maddr
+}
+
+neigh_vlan_suppress_arp()
+{
+	local vid1=10
+	local vid2=20
+	local sip1=192.0.2.1
+	local sip2=192.0.2.17
+	local tip1=192.0.2.2
+	local tip2=192.0.2.18
+	local h2_mac1
+	local h2_mac2
+
+	echo
+	echo "Per-{Port, VLAN} ARP suppression"
+	echo "--------------------------------"
+
+	run_cmd "tc -n sw1 qdisc replace dev vx0 clsact"
+	run_cmd "tc -n sw1 filter replace dev vx0 egress pref 1 handle 101 proto
0x0806 flower indev swp1 arp_tip $tip1 arp_sip $sip1 arp_op request action
pass"
+	run_cmd "tc -n sw1 filter replace dev vx0 egress pref 1 handle 102 proto
0x0806 flower indev swp1 arp_tip $tip2 arp_sip $sip2 arp_op request action
pass"
+
+	h2_mac1=$(ip -n h2 -j -p link show eth0.$vid1 | jq -r
'.[]["address"]')
+	h2_mac2=$(ip -n h2 -j -p link show eth0.$vid2 | jq -r
'.[]["address"]')
+	run_cmd "bridge -n sw1 fdb replace $h2_mac1 dev vx0 master static vlan
$vid1"
+	run_cmd "bridge -n sw1 fdb replace $h2_mac2 dev vx0 master static vlan
$vid2"
+	run_cmd "ip -n sw1 neigh replace $tip1 lladdr $h2_mac1 nud permanent dev
br0.$vid1"
+	run_cmd "ip -n sw1 neigh replace $tip2 lladdr $h2_mac2 nud permanent dev
br0.$vid2"
+
+	# Enable per-{Port, VLAN} neighbor suppression and check that ARP
+	# requests are not suppressed and that ARP replies are received.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_vlan_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep
\"neigh_vlan_suppress on\""
+	log_test $? 0 "\"neigh_vlan_suppress\" is on"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip1 -I eth0.$vid1
$tip1"
+	log_test $? 0 "arping (VLAN $vid1)"
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip2 -I eth0.$vid2
$tip2"
+	log_test $? 0 "arping (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "ARP suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 1
+	log_test $? 0 "ARP suppression (VLAN $vid2)"
+
+	# Enable neighbor suppression on VLAN 10 and check that only on this
+	# VLAN ARP requests are suppressed.
+	run_cmd "bridge -n sw1 vlan set vid $vid1 dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d vlan show dev vx0 vid $vid1 | grep
\"neigh_suppress on\""
+	log_test $? 0 "\"neigh_suppress\" is on (VLAN $vid1)"
+	run_cmd "bridge -n sw1 -d vlan show dev vx0 vid $vid2 | grep
\"neigh_suppress off\""
+	log_test $? 0 "\"neigh_suppress\" is off (VLAN $vid2)"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip1 -I eth0.$vid1
$tip1"
+	log_test $? 0 "arping (VLAN $vid1)"
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip2 -I eth0.$vid2
$tip2"
+	log_test $? 0 "arping (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "ARP suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 2
+	log_test $? 0 "ARP suppression (VLAN $vid2)"
+
+	# Enable neighbor suppression on the port and check that it has no
+	# effect compared to previous state.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
on\""
+	log_test $? 0 "\"neigh_suppress\" is on"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip1 -I eth0.$vid1
$tip1"
+	log_test $? 0 "arping (VLAN $vid1)"
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip2 -I eth0.$vid2
$tip2"
+	log_test $? 0 "arping (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "ARP suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 3
+	log_test $? 0 "ARP suppression (VLAN $vid2)"
+
+	# Disable neighbor suppression on the port and check that it has no
+	# effect compared to previous state.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress off"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
off\""
+	log_test $? 0 "\"neigh_suppress\" is off"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip1 -I eth0.$vid1
$tip1"
+	log_test $? 0 "arping (VLAN $vid1)"
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip2 -I eth0.$vid2
$tip2"
+	log_test $? 0 "arping (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "ARP suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 4
+	log_test $? 0 "ARP suppression (VLAN $vid2)"
+
+	# Disable neighbor suppression on VLAN 10 and check that ARP requests
+	# are no longer suppressed on this VLAN.
+	run_cmd "bridge -n sw1 vlan set vid $vid1 dev vx0 neigh_suppress
off"
+	run_cmd "bridge -n sw1 -d vlan show dev vx0 vid $vid1 | grep
\"neigh_suppress off\""
+	log_test $? 0 "\"neigh_suppress\" is off (VLAN $vid1)"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip1 -I eth0.$vid1
$tip1"
+	log_test $? 0 "arping (VLAN $vid1)"
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip2 -I eth0.$vid2
$tip2"
+	log_test $? 0 "arping (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 2
+	log_test $? 0 "ARP suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 5
+	log_test $? 0 "ARP suppression (VLAN $vid2)"
+
+	# Disable per-{Port, VLAN} neighbor suppression, enable neighbor
+	# suppression on the port and check that on both VLANs ARP requests are
+	# suppressed.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_vlan_suppress off"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep
\"neigh_vlan_suppress off\""
+	log_test $? 0 "\"neigh_vlan_suppress\" is off"
+
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
on\""
+	log_test $? 0 "\"neigh_suppress\" is on"
+
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip1 -I eth0.$vid1
$tip1"
+	log_test $? 0 "arping (VLAN $vid1)"
+	run_cmd "ip netns exec h1 arping -q -b -c 1 -w 5 -s $sip2 -I eth0.$vid2
$tip2"
+	log_test $? 0 "arping (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 2
+	log_test $? 0 "ARP suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 5
+	log_test $? 0 "ARP suppression (VLAN $vid2)"
+}
+
+neigh_vlan_suppress_ns()
+{
+	local vid1=10
+	local vid2=20
+	local saddr1=2001:db8:1::1
+	local saddr2=2001:db8:2::1
+	local daddr1=2001:db8:1::2
+	local daddr2=2001:db8:2::2
+	local maddr=ff02::1:ff00:2
+	local h2_mac1
+	local h2_mac2
+
+	echo
+	echo "Per-{Port, VLAN} NS suppression"
+	echo "-------------------------------"
+
+	run_cmd "tc -n sw1 qdisc replace dev vx0 clsact"
+	run_cmd "tc -n sw1 filter replace dev vx0 egress pref 1 handle 101 proto
ipv6 flower indev swp1 ip_proto icmpv6 dst_ip $maddr src_ip $saddr1 type 135
code 0 action pass"
+	run_cmd "tc -n sw1 filter replace dev vx0 egress pref 1 handle 102 proto
ipv6 flower indev swp1 ip_proto icmpv6 dst_ip $maddr src_ip $saddr2 type 135
code 0 action pass"
+
+	h2_mac1=$(ip -n h2 -j -p link show eth0.$vid1 | jq -r
'.[]["address"]')
+	h2_mac2=$(ip -n h2 -j -p link show eth0.$vid2 | jq -r
'.[]["address"]')
+	run_cmd "bridge -n sw1 fdb replace $h2_mac1 dev vx0 master static vlan
$vid1"
+	run_cmd "bridge -n sw1 fdb replace $h2_mac2 dev vx0 master static vlan
$vid2"
+	run_cmd "ip -n sw1 neigh replace $daddr1 lladdr $h2_mac1 nud permanent
dev br0.$vid1"
+	run_cmd "ip -n sw1 neigh replace $daddr2 lladdr $h2_mac2 nud permanent
dev br0.$vid2"
+
+	# Enable per-{Port, VLAN} neighbor suppression and check that NS
+	# messages are not suppressed and that ND messages are received.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_vlan_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep
\"neigh_vlan_suppress on\""
+	log_test $? 0 "\"neigh_vlan_suppress\" is on"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr1 -w 5000 $daddr1
eth0.$vid1"
+	log_test $? 0 "ndisc6 (VLAN $vid1)"
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr2 -w 5000 $daddr2
eth0.$vid2"
+	log_test $? 0 "ndisc6 (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "NS suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 1
+	log_test $? 0 "NS suppression (VLAN $vid2)"
+
+	# Enable neighbor suppression on VLAN 10 and check that only on this
+	# VLAN NS messages are suppressed.
+	run_cmd "bridge -n sw1 vlan set vid $vid1 dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d vlan show dev vx0 vid $vid1 | grep
\"neigh_suppress on\""
+	log_test $? 0 "\"neigh_suppress\" is on (VLAN $vid1)"
+	run_cmd "bridge -n sw1 -d vlan show dev vx0 vid $vid2 | grep
\"neigh_suppress off\""
+	log_test $? 0 "\"neigh_suppress\" is off (VLAN $vid2)"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr1 -w 5000 $daddr1
eth0.$vid1"
+	log_test $? 0 "ndisc6 (VLAN $vid1)"
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr2 -w 5000 $daddr2
eth0.$vid2"
+	log_test $? 0 "ndisc6 (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "NS suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 2
+	log_test $? 0 "NS suppression (VLAN $vid2)"
+
+	# Enable neighbor suppression on the port and check that it has no
+	# effect compared to previous state.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
on\""
+	log_test $? 0 "\"neigh_suppress\" is on"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr1 -w 5000 $daddr1
eth0.$vid1"
+	log_test $? 0 "ndisc6 (VLAN $vid1)"
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr2 -w 5000 $daddr2
eth0.$vid2"
+	log_test $? 0 "ndisc6 (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "NS suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 3
+	log_test $? 0 "NS suppression (VLAN $vid2)"
+
+	# Disable neighbor suppression on the port and check that it has no
+	# effect compared to previous state.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress off"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
off\""
+	log_test $? 0 "\"neigh_suppress\" is off"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr1 -w 5000 $daddr1
eth0.$vid1"
+	log_test $? 0 "ndisc6 (VLAN $vid1)"
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr2 -w 5000 $daddr2
eth0.$vid2"
+	log_test $? 0 "ndisc6 (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 1
+	log_test $? 0 "NS suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 4
+	log_test $? 0 "NS suppression (VLAN $vid2)"
+
+	# Disable neighbor suppression on VLAN 10 and check that NS messages
+	# are no longer suppressed on this VLAN.
+	run_cmd "bridge -n sw1 vlan set vid $vid1 dev vx0 neigh_suppress
off"
+	run_cmd "bridge -n sw1 -d vlan show dev vx0 vid $vid1 | grep
\"neigh_suppress off\""
+	log_test $? 0 "\"neigh_suppress\" is off (VLAN $vid1)"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr1 -w 5000 $daddr1
eth0.$vid1"
+	log_test $? 0 "ndisc6 (VLAN $vid1)"
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr2 -w 5000 $daddr2
eth0.$vid2"
+	log_test $? 0 "ndisc6 (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 2
+	log_test $? 0 "NS suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 5
+	log_test $? 0 "NS suppression (VLAN $vid2)"
+
+	# Disable per-{Port, VLAN} neighbor suppression, enable neighbor
+	# suppression on the port and check that on both VLANs NS messages are
+	# suppressed.
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_vlan_suppress off"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep
\"neigh_vlan_suppress off\""
+	log_test $? 0 "\"neigh_vlan_suppress\" is off"
+
+	run_cmd "bridge -n sw1 link set dev vx0 neigh_suppress on"
+	run_cmd "bridge -n sw1 -d link show dev vx0 | grep \"neigh_suppress
on\""
+	log_test $? 0 "\"neigh_suppress\" is on"
+
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr1 -w 5000 $daddr1
eth0.$vid1"
+	log_test $? 0 "ndisc6 (VLAN $vid1)"
+	run_cmd "ip netns exec h1 ndisc6 -q -r 1 -s $saddr2 -w 5000 $daddr2
eth0.$vid2"
+	log_test $? 0 "ndisc6 (VLAN $vid2)"
+
+	tc_check_packets sw1 "dev vx0 egress" 101 2
+	log_test $? 0 "NS suppression (VLAN $vid1)"
+	tc_check_packets sw1 "dev vx0 egress" 102 5
+	log_test $? 0 "NS suppression (VLAN $vid2)"
+}
+
+################################################################################
+# Usage
+
+usage()
+{
+	cat <<EOF
+usage: ${0##*/} OPTS
+
+        -t <test>   Test(s) to run (default: all)
+                    (options: $TESTS)
+        -p          Pause on fail
+        -P          Pause after each test before cleanup
+        -v          Verbose mode (show commands and output)
+EOF
+}
+
+################################################################################
+# Main
+
+trap cleanup EXIT
+
+while getopts ":t:pPvh" opt; do
+	case $opt in
+		t) TESTS=$OPTARG;;
+		p) PAUSE_ON_FAIL=yes;;
+		P) PAUSE=yes;;
+		v) VERBOSE=$(($VERBOSE + 1));;
+		h) usage; exit 0;;
+		*) usage; exit 1;;
+	esac
+done
+
+# Make sure we don't pause twice.
+[ "${PAUSE}" = "yes" ] && PAUSE_ON_FAIL=no
+
+if [ "$(id -u)" -ne 0 ];then
+	echo "SKIP: Need root privileges"
+	exit $ksft_skip;
+fi
+
+if [ ! -x "$(command -v ip)" ]; then
+	echo "SKIP: Could not run test without ip tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v bridge)" ]; then
+	echo "SKIP: Could not run test without bridge tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v tc)" ]; then
+	echo "SKIP: Could not run test without tc tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v arping)" ]; then
+	echo "SKIP: Could not run test without arping tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v ndisc6)" ]; then
+	echo "SKIP: Could not run test without ndisc6 tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v jq)" ]; then
+	echo "SKIP: Could not run test without jq tool"
+	exit $ksft_skip
+fi
+
+bridge link help 2>&1 | grep -q "neigh_vlan_suppress"
+if [ $? -ne 0 ]; then
+   echo "SKIP: iproute2 bridge too old, missing per-VLAN neighbor
suppression support"
+   exit $ksft_skip
+fi
+
+# Start clean.
+cleanup
+
+for t in $TESTS
+do
+	setup; $t; cleanup;
+done
+
+if [ "$TESTS" != "none" ]; then
+	printf "\nTests passed: %3d\n" ${nsuccess}
+	printf "Tests failed: %3d\n"   ${nfail}
+fi
+
+exit $ret
-- 
2.37.3

Nikolay Aleksandrov

2023-Apr-19 12:30 UTC

head link

[Bridge] [RFC PATCH net-next 0/9] bridge: Add per-{Port, VLAN} neighbor suppression

On 13/04/2023 12:58, Ido Schimmel wrote:> Background
> =========> 
> In order to minimize the flooding of ARP and ND messages in the VXLAN
> network, EVPN includes provisions [1] that allow participating VTEPs to
> suppress such messages in case they know the MAC-IP binding and can
> reply on behalf of the remote host. In Linux, the above is implemented
> in the bridge driver using a per-port option called
"neigh_suppress"
> that was added in kernel version 4.15 [2].
> 
> Motivation
> =========> 
> Some applications use ARP messages as keepalives between the application
> nodes in the network. This works perfectly well?when two nodes are
> connected to the same VTEP. When a node goes down it will stop
> responding to ARP requests and the other node will notice it
> immediately.
> 
> However, when the two nodes are connected to different VTEPs and
> neighbor suppression is enabled, the local VTEP will reply to ARP
> requests even after the remote node went down, until certain timers
> expire and the EVPN control plane decides to withdraw the?MAC/IP
> Advertisement route for the address. Therefore, some users would like to
> be able to disable neighbor suppression on VLANs where such applications
> reside and keep it enabled on the rest.
> 
> Implementation
> =============> 
> The proposed solution is to allow user space to control neighbor
> suppression on a per-{Port, VLAN} basis, in a similar fashion to other
> per-port options that gained per-{Port, VLAN} counterparts such as
> "mcast_router". This allows users to benefit from the operational
> simplicity and scalability associated with shared VXLAN devices (i.e.,
> external / collect-metadata mode), while still allowing for per-VLAN/VNI
> neighbor suppression control.
> 
> The user interface is extended with a new "neigh_vlan_suppress"
bridge
> port option that allows user space to enable per-{Port, VLAN} neighbor
> suppression on the bridge port. When enabled, the existing
> "neigh_suppress" option has no effect and neighbor suppression is
> controlled using a new "neigh_suppress" VLAN option. Example
usage:
> 
>  # bridge link set dev vxlan0 neigh_vlan_suppress on
>  # bridge vlan add vid 10 dev vxlan0
>  # bridge vlan set vid 10 dev vxlan0 neigh_suppress on
> 
> Testing
> ======> 
> Tested using existing bridge selftests. Added a dedicated selftest in
> the last patch.
> 
> Patchset overview
> ================> 
> Patches #1-#5 are preparations.
> 
> Patch #6 adds per-{Port, VLAN} neighbor suppression support to the
> bridge's data path.
> 
> Patches #7-#8 add the required netlink attributes to enable the feature.
> 
> Patch #9 adds a selftest.
> 
> iproute2 patches can be found here [3].
> 
> [1] https://www.rfc-editor.org/rfc/rfc7432#section-10
> [2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a42317785c898c0ed46db45a33b0cc71b671bf29
> [3] https://github.com/idosch/iproute2/tree/submit/neigh_suppress_v1
> 
> Ido Schimmel (9):
>   bridge: Reorder neighbor suppression check when flooding
>   bridge: Pass VLAN ID to br_flood()
>   bridge: Add internal flags for per-{Port, VLAN} neighbor suppression
>   bridge: Take per-{Port, VLAN} neighbor suppression into account
>   bridge: Encapsulate data path neighbor suppression logic
>   bridge: Add per-{Port, VLAN} neighbor suppression data path support
>   bridge: vlan: Allow setting VLAN neighbor suppression state
>   bridge: Allow setting per-{Port, VLAN} neighbor suppression state
>   selftests: net: Add bridge neighbor suppression test
> 
>  include/linux/if_bridge.h                     |   1 +
>  include/uapi/linux/if_bridge.h                |   1 +
>  include/uapi/linux/if_link.h                  |   1 +
>  net/bridge/br_arp_nd_proxy.c                  |  33 +-
>  net/bridge/br_device.c                        |   8 +-
>  net/bridge/br_forward.c                       |   8 +-
>  net/bridge/br_if.c                            |   2 +-
>  net/bridge/br_input.c                         |   2 +-
>  net/bridge/br_netlink.c                       |   8 +-
>  net/bridge/br_private.h                       |   5 +-
>  net/bridge/br_vlan.c                          |   1 +
>  net/bridge/br_vlan_options.c                  |  20 +-
>  net/core/rtnetlink.c                          |   2 +-
>  tools/testing/selftests/net/Makefile          |   1 +
>  .../net/test_bridge_neigh_suppress.sh         | 862 ++++++++++++++++++
>  15 files changed, 936 insertions(+), 19 deletions(-)
>  create mode 100755
tools/testing/selftests/net/test_bridge_neigh_suppress.sh
> 
The set looks good to me, nicely split and pretty straight-forward.
For the set:
Acked-by: Nikolay Aleksandrov <razor at blackwall.org>

Linux Ethernet Bridging - Apr 2023 - [Bridge] [RFC PATCH net-next 0/9] bridge: Add per-{Port, VLAN} neighbor suppression

[Bridge] [RFC PATCH net-next 0/9] bridge: Add per-{Port, VLAN} neighbor suppression

[Bridge] [RFC PATCH net-next 1/9] bridge: Reorder neighbor suppression check when flooding

[Bridge] [RFC PATCH net-next 2/9] bridge: Pass VLAN ID to br_flood()

[Bridge] [RFC PATCH net-next 3/9] bridge: Add internal flags for per-{Port, VLAN} neighbor suppression

[Bridge] [RFC PATCH net-next 4/9] bridge: Take per-{Port, VLAN} neighbor suppression into account

[Bridge] [RFC PATCH net-next 5/9] bridge: Encapsulate data path neighbor suppression logic

[Bridge] [RFC PATCH net-next 6/9] bridge: Add per-{Port, VLAN} neighbor suppression data path support

[Bridge] [RFC PATCH net-next 7/9] bridge: vlan: Allow setting VLAN neighbor suppression state

[Bridge] [RFC PATCH net-next 8/9] bridge: Allow setting per-{Port, VLAN} neighbor suppression state

[Bridge] [RFC PATCH net-next 9/9] selftests: net: Add bridge neighbor suppression test

[Bridge] [RFC PATCH net-next 0/9] bridge: Add per-{Port, VLAN} neighbor suppression