package/network/services/hostapd/patches/002-mesh-fix-channel-init-order-disable-pri-sec-channel-.patch

   1 From d869c753b79a1423c2bd9b0afdfa0d89d55a930c Mon Sep 17 00:00:00 2001
   2 From: Markus Theil <markus.theil@tu-ilmenau.de>
   3 Date: Tue, 30 Jun 2020 13:53:18 +0200
   4 Subject: [PATCH 02/19] mesh: fix channel init order, disable pri/sec channel
   5  switch
   6
   7 wpa_supplicant_conf_ap_ht has to happen before hostapd_setup_interface
   8 in order for its configuration settings to have effect on interface
   9 configuration.
  10
  11 Disable primary and secondary channel switch because of missing tie
  12 breaking rule/frames in mesh networks. A rather long comment about
  13 this issue is placed in mesh.c in the corresponding place.
  14
  15 In consequence, remove mesh coex test, which contradicts this change.
  16
  17 I was not able to reproduce the memory corruption during
  18 mesh_secure_ocv_mix_legacy, which lead to a revert of a similar patch
  19 in the past.
  20
  21 Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
  22 ---
  23  tests/hwsim/test_wpas_mesh.py | 50 -----------------------------------
  24  wpa_supplicant/mesh.c         | 25 ++++++++++++++++--
  25  2 files changed, 23 insertions(+), 52 deletions(-)
  26
  27 --- a/tests/hwsim/test_wpas_mesh.py
  28 +++ b/tests/hwsim/test_wpas_mesh.py
  29 @@ -933,56 +933,6 @@ def _test_wpas_mesh_open_5ghz(dev, apdev
  30      dev[0].dump_monitor()
  31      dev[1].dump_monitor()
  32
  33 -def test_wpas_mesh_open_5ghz_coex(dev, apdev):
  34 -    """Mesh network on 5 GHz band and 20/40 coex change"""
  35 -    try:
  36 -        _test_wpas_mesh_open_5ghz_coex(dev, apdev)
  37 -    finally:
  38 -        dev[0].request("MESH_GROUP_REMOVE " + dev[0].ifname)
  39 -        dev[1].request("MESH_GROUP_REMOVE " + dev[1].ifname)
  40 -        set_world_reg(apdev0=apdev[0], dev0=dev[0])
  41 -        dev[0].flush_scan_cache()
  42 -        dev[1].flush_scan_cache()
  43 -
  44 -def _test_wpas_mesh_open_5ghz_coex(dev, apdev):
  45 -    check_mesh_support(dev[0])
  46 -    subprocess.call(['iw', 'reg', 'set', 'US'])
  47 -
  48 -    # Start a 20 MHz BSS on channel 40 that would be the secondary channel of
  49 -    # HT40+ mesh on channel 36.
  50 -    params = {"ssid": "test-ht40",
  51 -              "hw_mode": "a",
  52 -              "channel": "40",
  53 -              "country_code": "US"}
  54 -    hapd = hostapd.add_ap(apdev[0], params)
  55 -    bssid = hapd.own_addr()
  56 -
  57 -    for i in range(2):
  58 -        for j in range(5):
  59 -            ev = dev[i].wait_event(["CTRL-EVENT-REGDOM-CHANGE"], timeout=5)
  60 -            if ev is None:
  61 -                raise Exception("No regdom change event")
  62 -            if "alpha2=US" in ev:
  63 -                break
  64 -        dev[i].scan_for_bss(bssid, freq=5200)
  65 -        add_open_mesh_network(dev[i], freq="5180")
  66 -
  67 -    check_mesh_joined_connected(dev)
  68 -
  69 -    freq = dev[0].get_status_field("freq")
  70 -    if freq != "5200":
  71 -        raise Exception("Unexpected STATUS freq=" + freq)
  72 -    sig = dev[0].request("SIGNAL_POLL").splitlines()
  73 -    if "FREQUENCY=5200" not in sig:
  74 -        raise Exception("Unexpected SIGNAL_POLL output: " + str(sig))
  75 -
  76 -    hapd.disable()
  77 -    dev[0].mesh_group_remove()
  78 -    dev[1].mesh_group_remove()
  79 -    check_mesh_group_removed(dev[0])
  80 -    check_mesh_group_removed(dev[1])
  81 -    dev[0].dump_monitor()
  82 -    dev[1].dump_monitor()
  83
  84  def test_wpas_mesh_open_ht40(dev, apdev):
  85      """Mesh and HT40 support difference"""
  86 --- a/wpa_supplicant/mesh.c
  87 +++ b/wpa_supplicant/mesh.c
  88 @@ -363,6 +363,29 @@ static int wpa_supplicant_mesh_init(stru
  89                 conf->basic_rates[rate_len] = -1;
  90         }
  91
  92 +       /* While it can enhance performance to switch the primary channel, which
  93 +        * is also the secondary channel of another network at the same time),
  94 +        * to the other primary channel, problems exist with this in mesh networks.
  95 +        *
  96 +        * Example with problems:
  97 +        *     - 3 mesh nodes M1-M3, freq (5200, 5180)
  98 +        *     - other node O1, e.g. AP mode, freq (5180, 5200),
  99 +        * Locations: O1 M1      M2      M3
 100 +        *
 101 +        * M3 can only send frames to M1 over M2, no direct connection is possible
 102 +        * Start O1, M1 and M3 first, M1 or O1 will switch channels to align with
 103 +        * each other. M3 does not swap, because M1 or O1 cannot be reached.
 104 +        * M2 is started afterwards and can either connect to M3 or M1 because of
 105 +        * this primary secondary channel switch.
 106 +        *
 107 +        * Solutions: (1) central coordination -> not always possible
 108 +        *            (2) disable pri/sec channel switch in mesh networks
 109 +        *
 110 +        * In AP mode, when all nodes can work independently, this poses of course
 111 +        * no problem, therefore disable it only in mesh mode.`*/
 112 +       conf->no_pri_sec_switch = 1;
 113 +       wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
 114 +
 115         if (wpa_drv_init_mesh(wpa_s)) {
 116                 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
 117                 return -1;
 118 @@ -374,8 +397,6 @@ static int wpa_supplicant_mesh_init(stru
 119                 return -1;
 120         }
 121
 122 -       wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
 123 -
 124         return 0;
 125  out_free:
 126         wpa_supplicant_mesh_deinit(wpa_s);