[PATCH net-next v3] net: Support filtering interfaces on no master

Currently there's support for filtering neighbours/links for interfaces
which have a specific master device (using the IFLA_MASTER/NDA_MASTER
attributes).

This patch adds support for filtering interfaces/neighbours dump for
interfaces that *don't* have a master.

Signed-off-by: Lahav Schlesinger <redacted>
Cc: David Ahern <dsahern@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
---
v2 -> v3
 - Change the way 'master' is checked for being non NULL
v1 -> v2
 - Change from filtering just for non VRF slaves to non slaves at all

 net/core/neighbour.c | 7 +++++++
 net/core/rtnetlink.c | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index b963d6b02c4f..2d5bc3a75fae 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c

@@ -2528,6 +2528,13 @@ static bool neigh_master_filtered(struct net_device *dev, int master_idx)
 		return false;
 
 	master = dev ? netdev_master_upper_dev_get(dev) : NULL;
+
+	/* 0 is already used to denote NDA_MASTER wasn't passed, therefore need another
+	 * invalid value for ifindex to denote "no master".
+	 */
+	if (master_idx == -1)
+		return !!master;
+
 	if (!master || master->ifindex != master_idx)
 		return true;
 

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 7c9d32cfe607..2dcf1c084b20 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c

@@ -1959,6 +1959,13 @@ static bool link_master_filtered(struct net_device *dev, int master_idx)
 		return false;
 
 	master = netdev_master_upper_dev_get(dev);
+
+	/* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need
+	 * another invalid value for ifindex to denote "no master".
+	 */
+	if (master_idx == -1)
+		return !!master;
+
 	if (!master || master->ifindex != master_idx)
 		return true;
 

-- 
2.25.1

On Tue, Aug 10, 2021 at 09:06:58AM +0000, Lahav Schlesinger wrote:

Currently there's support for filtering neighbours/links for interfaces
which have a specific master device (using the IFLA_MASTER/NDA_MASTER
attributes).

This patch adds support for filtering interfaces/neighbours dump for
interfaces that *don't* have a master.

Signed-off-by: Lahav Schlesinger <redacted>
Cc: David Ahern <dsahern@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
---
v2 -> v3
 - Change the way 'master' is checked for being non NULL
v1 -> v2
 - Change from filtering just for non VRF slaves to non slaves at all

 net/core/neighbour.c | 7 +++++++
 net/core/rtnetlink.c | 7 +++++++
 2 files changed, 14 insertions(+)

Thanks, for resending.

On 8/10/21 3:06 AM, Lahav Schlesinger wrote:

Currently there's support for filtering neighbours/links for interfaces
which have a specific master device (using the IFLA_MASTER/NDA_MASTER
attributes).

This patch adds support for filtering interfaces/neighbours dump for
interfaces that *don't* have a master.

Signed-off-by: Lahav Schlesinger <redacted>
Cc: David Ahern <dsahern@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
---
v2 -> v3
 - Change the way 'master' is checked for being non NULL
v1 -> v2
 - Change from filtering just for non VRF slaves to non slaves at all

 net/core/neighbour.c | 7 +++++++
 net/core/rtnetlink.c | 7 +++++++
 2 files changed, 14 insertions(+)

Reviewed-by: David Ahern <dsahern@kernel.org>

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Tue, 10 Aug 2021 09:06:58 +0000 you wrote:

Currently there's support for filtering neighbours/links for interfaces
which have a specific master device (using the IFLA_MASTER/NDA_MASTER
attributes).

This patch adds support for filtering interfaces/neighbours dump for
interfaces that *don't* have a master.

[...]

Here is the summary with links:
  - [net-next,v3] net: Support filtering interfaces on no master
    https://git.kernel.org/netdev/net-next/c/d3432bf10f17

You are awesome, thank you!
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