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hostapd: enter DFS state if no available channel is found

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Previously hostapd would not stop transmitting when a DFS event was
detected and no available channel to switch to was available.

Disable and re-enable the interface to enter DFS state. This way, TX
does not happen until the kernel notifies hostapd about the NOP
expiring.

Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer
2020-07-20 15:08:19 +02:00
parent cfd2f3bf6f
commit 93bbd998aa
1 changed files with 37 additions and 0 deletions
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37
package/network/services/hostapd/patches/800-dfs-enter-DFS-state-if-no-available-channel-is-found.patch Normal file
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@@ -0,0 +1,37 @@
From cefc52e6b93731c713f1bba1cb5e7e92105b758b Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Fri, 3 Jul 2020 23:00:34 +0200
Subject: [PATCH] dfs: enter DFS state if no available channel is found
Previously hostapd would not stop transmitting when a DFS event was
detected and no available channel to switch to was available.
Disable and re-enable the interface to enter DFS state. This way, TX
does not happen until the kernel notifies hostapd about the NOP
expiring.
Signed-off-by: David Bauer <mail@david-bauer.net>
---
src/ap/dfs.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/src/ap/dfs.c
+++ b/src/ap/dfs.c
@@ -1066,8 +1066,15 @@ static int hostapd_dfs_start_channel_swi
&oper_centr_freq_seg0_idx,
&oper_centr_freq_seg1_idx,
&skip_radar);
- if (!channel)
- return err;
+ if (!channel) {
+ /*
+ * Toggle interface state to enter DFS state
+ * until NOP is finished.
+ */
+ hostapd_disable_iface(iface);
+ hostapd_enable_iface(iface);
+ return 0;
+ }
if (!skip_radar) {
iface->freq = channel->freq;
iface->conf->channel = channel->chan;