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Date: Thu, 11 Mar 2021 01:35:58 +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,
Felix Fietkau <nbd@....name>
Subject: [PATCH net-next 17/23] netfilter: flowtable: bridge vlan hardware offload and switchdev
From: Felix Fietkau <nbd@....name>
The switch might have already added the VLAN tag through PVID hardware
offload. Keep this extra VLAN in the flowtable but skip it on egress.
Signed-off-by: Felix Fietkau <nbd@....name>
---
include/linux/netdevice.h | 1 +
include/net/netfilter/nf_flow_table.h | 8 +++++---
net/bridge/br_device.c | 1 +
net/bridge/br_vlan.c | 2 ++
net/netfilter/nf_flow_table_core.c | 2 ++
net/netfilter/nf_flow_table_offload.c | 6 +++++-
net/netfilter/nft_flow_offload.c | 5 +++++
7 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d9c88962fa13..4c5d2d51ae82 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -853,6 +853,7 @@ struct net_device_path {
DEV_PATH_BR_VLAN_KEEP,
DEV_PATH_BR_VLAN_TAG,
DEV_PATH_BR_VLAN_UNTAG,
+ DEV_PATH_BR_VLAN_UNTAG_HW,
} vlan_mode;
u16 vlan_id;
__be16 vlan_proto;
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index 0f6115d90867..01b256b7fd98 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -123,9 +123,10 @@ struct flow_offload_tuple {
/* All members above are keys for lookups, see flow_offload_hash(). */
struct { } __hash;
- u8 dir:4,
+ u8 dir:2,
xmit_type:2,
- encap_num:2;
+ encap_num:2,
+ in_vlan_ingress:2;
u16 mtu;
union {
struct dst_entry *dst_cache;
@@ -185,7 +186,8 @@ struct nf_flow_route {
u16 id;
__be16 proto;
} encap[NF_FLOW_TABLE_ENCAP_MAX];
- u8 num_encaps;
+ u8 num_encaps:2,
+ ingress_vlans:2;
} in;
struct {
u32 ifindex;
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 0c72503e0d39..e8b626cc6bfd 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -422,6 +422,7 @@ static int br_fill_forward_path(struct net_device_path_ctx *ctx,
ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
ctx->num_vlans++;
break;
+ case DEV_PATH_BR_VLAN_UNTAG_HW:
case DEV_PATH_BR_VLAN_UNTAG:
ctx->num_vlans--;
break;
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 0d09d3745e52..8e92ee5bef67 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1386,6 +1386,8 @@ int br_vlan_fill_forward_path_mode(struct net_bridge *br,
if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG)
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
+ else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
+ path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW;
else
path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG;
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index f85f3d6e56d1..2195b1c56853 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -95,6 +95,8 @@ static int flow_offload_fill_route(struct flow_offload *flow,
for (i = route->tuple[dir].in.num_encaps - 1; i >= 0; i--) {
flow_tuple->encap[j].id = route->tuple[dir].in.encap[i].id;
flow_tuple->encap[j].proto = route->tuple[dir].in.encap[i].proto;
+ if (route->tuple[dir].in.ingress_vlans & BIT(i))
+ flow_tuple->in_vlan_ingress |= BIT(j);
j++;
}
flow_tuple->encap_num = route->tuple[dir].in.num_encaps;
diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 00b35689815f..796f46463457 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -592,8 +592,12 @@ nf_flow_rule_route_common(struct net *net, const struct flow_offload *flow,
other_tuple = &flow->tuplehash[!dir].tuple;
for (i = 0; i < other_tuple->encap_num; i++) {
- struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
+ struct flow_action_entry *entry;
+ if (other_tuple->in_vlan_ingress & BIT(i))
+ continue;
+
+ entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_VLAN_PUSH;
entry->vlan.vid = other_tuple->encap[i].id;
entry->vlan.proto = other_tuple->encap[i].proto;
diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
index d25b4b109e25..4843dd2b410c 100644
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -72,6 +72,7 @@ struct nft_forward_info {
__be16 proto;
} encap[NF_FLOW_TABLE_ENCAP_MAX];
u8 num_encaps;
+ u8 ingress_vlans;
u8 h_source[ETH_ALEN];
u8 h_dest[ETH_ALEN];
enum flow_offload_xmit_type xmit_type;
@@ -130,6 +131,9 @@ static void nft_dev_path_info(const struct net_device_path_stack *stack,
memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
switch (path->bridge.vlan_mode) {
+ case DEV_PATH_BR_VLAN_UNTAG_HW:
+ info->ingress_vlans |= BIT(info->num_encaps - 1);
+ break;
case DEV_PATH_BR_VLAN_TAG:
info->encap[info->num_encaps].id = path->bridge.vlan_id;
info->encap[info->num_encaps].proto = path->bridge.vlan_proto;
@@ -198,6 +202,7 @@ static void nft_dev_forward_path(struct nf_flow_route *route,
route->tuple[!dir].in.encap[i].proto = info.encap[i].proto;
}
route->tuple[!dir].in.num_encaps = info.num_encaps;
+ route->tuple[!dir].in.ingress_vlans = info.ingress_vlans;
if (info.xmit_type == FLOW_OFFLOAD_XMIT_DIRECT) {
memcpy(route->tuple[dir].out.h_source, info.h_source, ETH_ALEN);
--
2.20.1
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