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mac80211: fix a corner case in encapsulation offload support

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Fix encryption key selection with WEP

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2020-12-17 22:21:43 +01:00
parent 268210cec8
commit 8fc2cfea87
1 changed files with 53 additions and 0 deletions
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53
package/kernel/mac80211/patches/subsys/313-mac80211-fix-encryption-key-selection-for-802.3-xmit.patch Normal file
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@ -0,0 +1,53 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 16 Dec 2020 21:23:24 +0100
Subject: [PATCH] mac80211: fix encryption key selection for 802.3 xmit
When using WEP, the default unicast key needs to be selected, instead of
the STA PTK.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -4262,7 +4262,6 @@ netdev_tx_t ieee80211_subif_start_xmit_8
struct ethhdr *ehdr = (struct ethhdr *)skb->data;
struct ieee80211_key *key;
struct sta_info *sta;
- bool offload = true;
if (unlikely(skb->len < ETH_HLEN)) {
kfree_skb(skb);
@@ -4278,18 +4277,22 @@ netdev_tx_t ieee80211_subif_start_xmit_8
if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
- sdata->control_port_protocol == ehdr->h_proto))
- offload = false;
- else if ((key = rcu_dereference(sta->ptk[sta->ptk_idx])) &&
- (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
- key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
- offload = false;
+ sdata->control_port_protocol == ehdr->h_proto))
+ goto skip_offload;
- if (offload)
- ieee80211_8023_xmit(sdata, dev, sta, key, skb);
- else
- ieee80211_subif_start_xmit(skb, dev);
+ key = rcu_dereference(sta->ptk[sta->ptk_idx]);
+ if (!key)
+ key = rcu_dereference(sdata->default_unicast_key);
+
+ if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
+ key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
+ goto skip_offload;
+
+ ieee80211_8023_xmit(sdata, dev, sta, key, skb);
+ goto out;
+skip_offload:
+ ieee80211_subif_start_xmit(skb, dev);
out:
rcu_read_unlock();