OpenWrt DFS: Unterschied zwischen den Versionen
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Leo (Diskussion | Beiträge) (more) |
(→Enable DFS for OpenWRT) |
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....What now???... | ....What now???... | ||
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| + | ''It seems to be a crda/regdom problem!! I suppose that the channel list isn't read from the binary encoded regdomdb file, but directly from the EEPROM of the wireless NIC.. It might be that the Atheros SoC is hardcoded to a region which doesn't support DFS e.g. CN.. In the kernel configuration there is the possibility to set an option to instruct the atheros driver to read the regdom not from the EEPROM of the wireless NIC, but directly from the regdb file over crda and to override thus the table in the memory.. To edit kernel configuration in OpenWRT you can simply use "make kernel_menuconfig".. HTH --[[Benutzer:P424D0X|P424D0X]] ([[Benutzer Diskussion:P424D0X|Diskussion]]) 10:21, 25. Jan. 2014 (CET)'' | ||
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Version vom 25. Januar 2014, 11:21 Uhr
Enable DFS for OpenWRT
Aim is to enable DFS for 5GHz wifi band. Until today we found no usable solution to integrade DFS suipport into OpenWRT. Without DFS there is no official 802.11n outdoor channels support.
In the following we will log our approach to (try to) enable DFS.
Compile trunk of OpenWRT
On 2014-01-24 we made SVN checkout of OpenWRT trunk with rev. 39385. All compiled well.
1st Run
Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): Configuration file: /var/run/hostapd-phy0.conf Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): wlan0: IEEE 802.11 Configured channel (112) not found from the channel list of current mode (2) IEEE 802.11a Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): wlan0: IEEE 802.11 Hardware does not support configured channel Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): Could not select hw_mode and channel. (-3) Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): wlan0: Unable to setup interface. Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): hostapd_free_hapd_data: Interface wlan0 wasn't started Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): cat: can't open '/var/run/wifi-phy0.pid': No such file or directory Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): Command failed: Invalid argument Thu Jan 1 00:08:10 1970 daemon.notice netifd: radio0 (933): Device setup failed: HOSTAPD_START_FAILED
Message "not found from the channel list of current mode" origin:
/trunk/build_dir/target-mips_34kc_uClibc-0.9.33.2/hostapd-wpad-mini/hostapd-20131120/src/ap/hw_features.c:885
Three places in source code can generate this error. Now, find the exact place. Add more debug messages manually.
2nd Run
Again compiles and executed we get error
Thu Jan 1 00:00:49 1970 daemon.warn hostapd: wlan0: IEEE 802.11 debug oni: select_hw_mode
Therefore the reason for this error is
...
case HOSTAPD_CHAN_INVALID:
default:
hostapd_notify_bad_chans(iface);
return -3;
...
new method to search for
hostapd_check_chans(iface)
In that method we have
if (iface->conf->channel) {
if (hostapd_is_usable_chans(iface))
return HOSTAPD_CHAN_VALID;
else
return HOSTAPD_CHAN_INVALID;
}
Search now for hostapd_is_usable_chans()
static int hostapd_is_usable_chans(struct hostapd_iface *iface)
{
if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
return 0;
if (!iface->conf->secondary_channel)
return 1;
return hostapd_is_usable_chan(iface, iface->conf->channel +
iface->conf->secondary_channel * 4, 0);
}
There are two possible places to return zero.
Result of next test:
Thu Jan 1 00:00:19 1970 daemon.warn hostapd: wlan0: IEEE 802.11 debug oni: select_hw_mode
Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (697): debug oni: test1234
debug oni: if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))wlan0: IEEE 802.11 Configured channel (112) not found from the channel list of current mode (2) IEEE 802.11a
Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (697): wlan0: IEEE 802.11 debug oni: select_hw_mode
Is is the first if clause. Debug this one.
Result:
Thu Jan 1 00:00:18 1970 daemon.warn hostapd: wlan0: IEEE 802.11 debug oni: select_hw_mode Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: test1234debug oni: chan->chan is 36 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 40 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 44 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 48 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 52 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 56 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 60 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 64 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 100 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 104 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 108 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 116 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 120 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 124 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 128 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 132 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 136 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 140 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 149 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 153 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 157 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 161 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: chan->chan is 165 and channel is 112 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): debug oni: is_usable_chan now returns 0debug oni: if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))wlan0: IEEE 802.11 Configured channel (112) not found from the channel list of current mode (2) IEEE 802.11a Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (689): wlan0: IEEE 802.11 debug oni: select_hw_mode
netifd is searching for channel 112 but does not find it. We are changing the channel for futher tests to 108.
Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: test1234debug oni: chan->chan is 36 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 40 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 44 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 48 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 52 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 56 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 60 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 64 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 100 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 104 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 132 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 136 and channel is 108 Thu Jan 1 00:00:19 1970 daemon.notice netifd: radio0 (696): debug oni: chan->chan is 140 and channel is 108
Again he is not finding the new channel 108. The question is now, where is the channel list created. It seems that there is an error. Add more debugging.
Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: test1234debug oni: chan->chan is 36 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 40 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 44 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 48 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 52 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 56 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 60 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 64 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: chan->chan is 100 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): debug oni: found configured channel 104 in channel list BUT ignored. Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): cat: can't open '/var/run/wifi-phy0.pid': No such file or directory Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): Command failed: Invalid argument Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (695): Device setup failed: HOSTAPD_START_FAILED
Now we have the case that our configured channel was found. Yeah. BUT is is marked as DISABLED. WTF? Source code:
if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
return 1;
else {
printf("debug oni: found configured channel %d in channel list BUT ignored.\n", channel);
printf("debug oni: channel disabled. chan->flag set AND CHAN_DISABLED\n");
}
New question: Why is the channel marked as disabled.
Now we list all channels with flags:
Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: test1234debug oni: channel 36 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 40 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 44 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 48 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 52 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 56 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 60 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 64 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 100 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 104 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 136 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 140 , chan->flag 1 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 149 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 153 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 157 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 161 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel 165 , chan->flag 0 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 36 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 40 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 44 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 48 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 52 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 56 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 60 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 64 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 100 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: found configured channel 104 in channel list BUT ignored. Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: channel disabled. chan->flag set AND CHAN_DISABLED Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): debug oni: chan->chan is 108 and channel is 104 Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): Command failed: Invalid argument Thu Jan 1 00:00:18 1970 daemon.notice netifd: radio0 (690): Device setup failed: HOSTAPD_START_FAILED
All outdoor channels are disabled. Find the place where this is done. Shouldn't that be fixed in hostapd with all the patches for DFS???
Active wpad (hostapd) intern debug messages with
option log_level 0
in wifi section in /etc/config/wireless
Now we see an earlier error message:
Thu Jan 1 00:00:19 1970 kern.info kernel: [ 19.100000] br-lan: port 2(wlan0) entered forwarding state Thu Jan 1 00:00:19 1970 daemon.warn hostapd: wlan0: IEEE 802.11 Configured channel (104) not found from the channel list of current mode (2) IEEE 802.11a Thu Jan 1 00:00:19 1970 daemon.warn hostapd: wlan0: IEEE 802.11 Hardware does not support configured channel Thu Jan 1 00:00:19 1970 daemon.warn hostapd: wlan0: IEEE 802.11 debug oni: select_hw_mode
Why is channel 104 not in list of 802.11a?
Source of this message can be found in hostapd_notify_bad_chans()
....What now???...
It seems to be a crda/regdom problem!! I suppose that the channel list isn't read from the binary encoded regdomdb file, but directly from the EEPROM of the wireless NIC.. It might be that the Atheros SoC is hardcoded to a region which doesn't support DFS e.g. CN.. In the kernel configuration there is the possibility to set an option to instruct the atheros driver to read the regdom not from the EEPROM of the wireless NIC, but directly from the regdb file over crda and to override thus the table in the memory.. To edit kernel configuration in OpenWRT you can simply use "make kernel_menuconfig".. HTH --P424D0X (Diskussion) 10:21, 25. Jan. 2014 (CET)
Other way to find the problem Todo
- Enable ALL debug messages. There are many debug messages which are not enabled by log_level.
- Why is there no channel 104 in dfs_is_chan_allowed() in dfs.c ?
