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mesh: Fix channel init order, disable pri/sec channel switch

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wpa_supplicant_conf_ap_ht() has to happen before
hostapd_setup_interface() in order for its configuration settings to
have effect on interface configuration.

Disable primary and secondary channel switch because of missing tie
breaking rule/frames in mesh networks. A rather long comment about
this issue is placed in mesh.c in the corresponding place.

I was not able to reproduce the memory corruption during
mesh_secure_ocv_mix_legacy, which lead to a revert of a similar patch in
the past.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
This commit is contained in:
Markus Theil 2020-06-30 13:53:18 +02:00 committed by Jouni Malinen
parent 0be9c232a3
commit 93da12fd9f
1 changed files with 25 additions and 2 deletions
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27
wpa_supplicant/mesh.c
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@ -363,6 +363,31 @@ static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
conf->basic_rates[rate_len] = -1;
}
/* While it can enhance performance to switch the primary channel, which
* is also the secondary channel of another network at the same time),
* to the other primary channel, problems exist with this in mesh
* networks.
*
* Example with problems:
* - 3 mesh nodes M1-M3, freq (5200, 5180)
* - other node O1, e.g. AP mode, freq (5180, 5200),
* Locations: O1 M1 M2 M3
*
* M3 can only send frames to M1 over M2, no direct connection is
* possible
* Start O1, M1 and M3 first, M1 or O1 will switch channels to align
* with* each other. M3 does not swap, because M1 or O1 cannot be
* reached. M2 is started afterwards and can either connect to M3 or M1
* because of this primary secondary channel switch.
*
* Solutions: (1) central coordination -> not always possible
* (2) disable pri/sec channel switch in mesh networks
*
* In AP mode, when all nodes can work independently, this poses of
* course no problem, therefore disable it only in mesh mode. */
conf->no_pri_sec_switch = 1;
wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
if (wpa_drv_init_mesh(wpa_s)) {
wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
return -1;
@ -374,8 +399,6 @@ static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
return -1;
}
wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
return 0;
out_free:
wpa_supplicant_mesh_deinit(wpa_s);