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mac80211: fix receiving mesh packets in forwarding=0 networks

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When forwarding is set to 0, frames are typically sent with ttl=1.
Move the ttl decrement check below the check for local receive in order to
fix packet drops.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2023-03-26 17:19:03 +02:00
parent de3d60b982
commit 3ab670b24e
1 changed files with 50 additions and 0 deletions
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package/kernel/mac80211/patches/subsys/329-wifi-mac80211-fix-receiving-mesh-packets-in-forwardi.patch Normal file
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@ -0,0 +1,50 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 26 Mar 2023 17:11:34 +0200
Subject: [PATCH] wifi: mac80211: fix receiving mesh packets in forwarding=0
networks
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
When forwarding is set to 0, frames are typically sent with ttl=1.
Move the ttl decrement check below the check for local receive in order to
fix packet drops.
Reported-by: Thomas Hühn <thomas.huehn@hs-nordhausen.de>
Reported-by: Nick Hainke <vincent@systemli.org>
Fixes: 986e43b19ae9 ("wifi: mac80211: fix receiving A-MSDU frames on mesh interfaces")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2828,14 +2828,6 @@ ieee80211_rx_mesh_data(struct ieee80211_
if (sdata->crypto_tx_tailroom_needed_cnt)
tailroom = IEEE80211_ENCRYPT_TAILROOM;
- if (!--mesh_hdr->ttl) {
- if (multicast)
- goto rx_accept;
-
- IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
- return RX_DROP_MONITOR;
- }
-
if (mesh_hdr->flags & MESH_FLAGS_AE) {
struct mesh_path *mppath;
char *proxied_addr;
@@ -2874,6 +2866,14 @@ ieee80211_rx_mesh_data(struct ieee80211_
if (ether_addr_equal(sdata->vif.addr, eth->h_dest))
goto rx_accept;
+ if (!--mesh_hdr->ttl) {
+ if (multicast)
+ goto rx_accept;
+
+ IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
+ return RX_DROP_MONITOR;
+ }
+
if (!ifmsh->mshcfg.dot11MeshForwarding) {
if (is_multicast_ether_addr(eth->h_dest))
goto rx_accept;