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Date: Wed, 24 Mar 2021 02:30:35 +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
Subject: [PATCH net-next,v2 04/24] net: bridge: resolve forwarding path for VLAN tag actions in bridge devices
From: Felix Fietkau <nbd@....name>
Depending on the VLAN settings of the bridge and the port, the bridge can
either add or remove a tag. When vlan filtering is enabled, the fdb lookup
also needs to know the VLAN tag/proto for the destination address
To provide this, keep track of the stack of VLAN tags for the path in the
lookup context
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
v2: no changes.
include/linux/netdevice.h | 16 ++++++++++++
net/8021q/vlan_dev.c | 6 +++++
net/bridge/br_device.c | 23 ++++++++++++++++-
net/bridge/br_private.h | 20 +++++++++++++++
net/bridge/br_vlan.c | 53 +++++++++++++++++++++++++++++++++++++++
5 files changed, 117 insertions(+), 1 deletion(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b8b6927e04fc..ad67f26c77d8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -862,10 +862,20 @@ struct net_device_path {
u16 id;
__be16 proto;
} encap;
+ struct {
+ enum {
+ DEV_PATH_BR_VLAN_KEEP,
+ DEV_PATH_BR_VLAN_TAG,
+ DEV_PATH_BR_VLAN_UNTAG,
+ } vlan_mode;
+ u16 vlan_id;
+ __be16 vlan_proto;
+ } bridge;
};
};
#define NET_DEVICE_PATH_STACK_MAX 5
+#define NET_DEVICE_PATH_VLAN_MAX 2
struct net_device_path_stack {
int num_paths;
@@ -875,6 +885,12 @@ struct net_device_path_stack {
struct net_device_path_ctx {
const struct net_device *dev;
const u8 *daddr;
+
+ int num_vlans;
+ struct {
+ u16 id;
+ __be16 proto;
+ } vlan[NET_DEVICE_PATH_VLAN_MAX];
};
enum tc_setup_type {
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 1b1955a63f7f..4db3f0621959 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -786,6 +786,12 @@ static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
path->encap.proto = vlan->vlan_proto;
path->dev = ctx->dev;
ctx->dev = vlan->real_dev;
+ if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
+ return -ENOSPC;
+
+ ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
+ ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
+ ctx->num_vlans++;
return 0;
}
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index c241719013f4..0c72503e0d39 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -396,7 +396,10 @@ static int br_fill_forward_path(struct net_device_path_ctx *ctx,
return -1;
br = netdev_priv(ctx->dev);
- f = br_fdb_find_rcu(br, ctx->daddr, 0);
+
+ br_vlan_fill_forward_path_pvid(br, ctx, path);
+
+ f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
if (!f || !f->dst)
return -1;
@@ -404,10 +407,28 @@ static int br_fill_forward_path(struct net_device_path_ctx *ctx,
if (!dst)
return -1;
+ if (br_vlan_fill_forward_path_mode(br, dst, path))
+ return -1;
+
path->type = DEV_PATH_BRIDGE;
path->dev = dst->br->dev;
ctx->dev = dst->dev;
+ switch (path->bridge.vlan_mode) {
+ case DEV_PATH_BR_VLAN_TAG:
+ if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
+ return -ENOSPC;
+ ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
+ ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
+ ctx->num_vlans++;
+ break;
+ case DEV_PATH_BR_VLAN_UNTAG:
+ ctx->num_vlans--;
+ break;
+ case DEV_PATH_BR_VLAN_KEEP:
+ break;
+ }
+
return 0;
}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index d7d167e10b70..50747990188e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1118,6 +1118,13 @@ void br_vlan_notify(const struct net_bridge *br,
bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
const struct net_bridge_vlan *range_end);
+void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
+ struct net_device_path_ctx *ctx,
+ struct net_device_path *path);
+int br_vlan_fill_forward_path_mode(struct net_bridge *br,
+ struct net_bridge_port *dst,
+ struct net_device_path *path);
+
static inline struct net_bridge_vlan_group *br_vlan_group(
const struct net_bridge *br)
{
@@ -1277,6 +1284,19 @@ static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
return 0;
}
+static inline void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
+ struct net_device_path_ctx *ctx,
+ struct net_device_path *path)
+{
+}
+
+static inline int br_vlan_fill_forward_path_mode(struct net_bridge *br,
+ struct net_bridge_port *dst,
+ struct net_device_path *path)
+{
+ return 0;
+}
+
static inline struct net_bridge_vlan_group *br_vlan_group(
const struct net_bridge *br)
{
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 8829f621b8ec..0d09d3745e52 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1339,6 +1339,59 @@ int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
}
EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu);
+void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
+ struct net_device_path_ctx *ctx,
+ struct net_device_path *path)
+{
+ struct net_bridge_vlan_group *vg;
+ int idx = ctx->num_vlans - 1;
+ u16 vid;
+
+ path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
+
+ if (!br_opt_get(br, BROPT_VLAN_ENABLED))
+ return;
+
+ vg = br_vlan_group(br);
+
+ if (idx >= 0 &&
+ ctx->vlan[idx].proto == br->vlan_proto) {
+ vid = ctx->vlan[idx].id;
+ } else {
+ path->bridge.vlan_mode = DEV_PATH_BR_VLAN_TAG;
+ vid = br_get_pvid(vg);
+ }
+
+ path->bridge.vlan_id = vid;
+ path->bridge.vlan_proto = br->vlan_proto;
+}
+
+int br_vlan_fill_forward_path_mode(struct net_bridge *br,
+ struct net_bridge_port *dst,
+ struct net_device_path *path)
+{
+ struct net_bridge_vlan_group *vg;
+ struct net_bridge_vlan *v;
+
+ if (!br_opt_get(br, BROPT_VLAN_ENABLED))
+ return 0;
+
+ vg = nbp_vlan_group_rcu(dst);
+ v = br_vlan_find(vg, path->bridge.vlan_id);
+ if (!v || !br_vlan_should_use(v))
+ return -EINVAL;
+
+ if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
+ return 0;
+
+ if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG)
+ path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
+ else
+ path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG;
+
+ return 0;
+}
+
int br_vlan_get_info(const struct net_device *dev, u16 vid,
struct bridge_vlan_info *p_vinfo)
{
--
2.20.1
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