netdev - [PATCH net-next,v3 4/9] net: 8021q: resolve forwarding path for vlan devices

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Date:   Wed, 11 Nov 2020 20:37:32 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org,
        razor@...ckwall.org, jeremy@...zel.net
Subject: [PATCH net-next,v3 4/9] net: 8021q: resolve forwarding path for vlan devices

Add .ndo_fill_forward_path for vlan devices.

For instance, assuming the following topology:

                   IP forwarding
                  /             \
            eth0.100             eth0
            |
            eth0
            .
            .
            .
           ethX
     ab:cd:ef:ab:cd:ef

For packets going through IP forwarding to eth0.100 whose destination
MAC address is ab:cd:ef:ab:cd:ef, dev_fill_forward_path() provides the
following path:

        eth0.100 -> eth0

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 include/linux/netdevice.h |  7 +++++++
 net/8021q/vlan_dev.c      | 15 +++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 752649d8669f..ca8525a1a797 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -835,11 +835,18 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
 
 enum net_device_path_type {
 	DEV_PATH_ETHERNET = 0,
+	DEV_PATH_VLAN,
 };
 
 struct net_device_path {
 	enum net_device_path_type	type;
 	const struct net_device		*dev;
+	union {
+		struct {
+			u16		id;
+			__be16		proto;
+		} vlan;
+	};
 };
 
 #define NET_DEVICE_PATH_STACK_MAX	5
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index ec8408d1638f..f06a507557f9 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -767,6 +767,20 @@ static int vlan_dev_get_iflink(const struct net_device *dev)
 	return real_dev->ifindex;
 }
 
+static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
+				      struct net_device_path *path)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
+
+	path->type = DEV_PATH_VLAN;
+	path->vlan.id = vlan->vlan_id;
+	path->vlan.proto = vlan->vlan_proto;
+	path->dev = ctx->dev;
+	ctx->dev = vlan->real_dev;
+
+	return 0;
+}
+
 static const struct ethtool_ops vlan_ethtool_ops = {
 	.get_link_ksettings	= vlan_ethtool_get_link_ksettings,
 	.get_drvinfo	        = vlan_ethtool_get_drvinfo,
@@ -805,6 +819,7 @@ static const struct net_device_ops vlan_netdev_ops = {
 #endif
 	.ndo_fix_features	= vlan_dev_fix_features,
 	.ndo_get_iflink		= vlan_dev_get_iflink,
+	.ndo_fill_forward_path	= vlan_dev_fill_forward_path,
 };
 
 static void vlan_dev_free(struct net_device *dev)
-- 
2.20.1