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netfilter: flowtable: restore ieee80211 forward path

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Before commit 871df5007e ("netfilter: flowtable: bail out if forward
path cannot be discovered"), there was a fallback to set up a forward
path in case .ndo_fill_forward_path fails or DEV_PATH_MTK_WDMA was used.
Such fallback was used by commit d787a3e38f ("mac80211: add support
for .ndo_fill_forward_path").

One possibility is to handle DEV_PATH_MTK_WDMA from the flowtable
forward path discovery. However, this is only used internally by drivers
to retrieve mtk_wdma information to set up hardware offload. Felix
decided to use the .fill_forward_path interface for this purpose due to
the lack of a better interface at that time.

Add a new DEV_PATH_IEEE80211 path which is offered if the new ieee80211
flag is set on in the struct net_device_path_ctx to restore the
flowtable with a ieee80211 netdevice. Handle this new DEV_PATH_IEEE80211
path just like DEV_PATH_ETHERNET and DEV_PATH_DSA, ie. this is the last
netdevice in the stack.

This new ieee80211 flag is implicitly unset for mtk_ppe and airoha which
call dev_fill_forward_path() to retrieve a DEV_PATH_MTK_WDMA path.

Fixes: 871df5007e ("netfilter: flowtable: bail out if forward path cannot be discovered")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2026-09-23 20:46:18 +02:00
parent 7c549fb7ee
commit 3ae37eafd3
3 changed files with 13 additions and 0 deletions
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3
include/linux/netdevice.h
View File

@ -887,6 +887,7 @@ enum net_device_path_type {
DEV_PATH_DSA,
DEV_PATH_MTK_WDMA,
DEV_PATH_TUN,
DEV_PATH_IEEE80211,
};
struct net_device_path {
@ -953,6 +954,8 @@ struct net_device_path_ctx {
u16 id;
__be16 proto;
} vlan[NET_DEVICE_PATH_VLAN_MAX];
bool ieee80211;
};
enum tc_setup_type {

7
net/mac80211/iface.c
View File

@ -1023,6 +1023,13 @@ static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
struct sta_info *sta;
int ret = -ENOENT;
if (ctx->ieee80211) {
path->type = DEV_PATH_IEEE80211;
path->dev = ctx->dev;
ctx->dev = NULL;
return 0;
}
sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
local = sdata->local;

3
net/netfilter/nf_flow_table_path.c
View File

@ -53,6 +53,7 @@ static int nft_dev_fill_forward_path(const struct dst_entry *dst_cache,
struct net_device_path_ctx ctx = {
.dev = dev,
.ether_type = ether_type,
.ieee80211 = true,
};
struct neighbour *n;
u8 nud_state;
@ -114,6 +115,7 @@ static int nft_dev_path_info(struct net_device_path_stack *stack,
path = &stack->path[i];
switch (path->type) {
case DEV_PATH_ETHERNET:
case DEV_PATH_IEEE80211:
case DEV_PATH_DSA:
case DEV_PATH_VLAN:
case DEV_PATH_PPPOE:
@ -123,6 +125,7 @@ static int nft_dev_path_info(struct net_device_path_stack *stack,
memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN);
if (path->type == DEV_PATH_ETHERNET ||
path->type == DEV_PATH_IEEE80211 ||
path->type == DEV_PATH_DSA)
break;