[ath9k-devel] Newbie: Need help, trouble running hostapd after modifications in mac80211 and cfg80211...

[ath9k-devel] Newbie: Need help, trouble running hostapd after modifications in mac80211 and cfg80211...

[Rakesh Kumar]

>
>
> Try
> http://www.orbit-lab.org/kernel/compat-wireless-2.6-stable/v2.6.31/compat-wireless-2.6.31-rc4.tar.bz2
>
>  Luis


Okay, the mistake I was doing previously was not loading all the
pre-requisite modules before loading ath9k, namely rfkill and led_class but
now I did that and I also incorporated the same changes in 2.6.31 version
Louis suggested and in both cases, i.e. 2.6.30 and 2.6.31 with same changes,
results are some. It doesn't work!

As soon as a try to run hostapd on that interface, here's what happens:

rakesh at pineapple:/usr/src/hostapd-0.6.9/hostapd$ sudo hostapd hostapd.conf
*Configuration file: hostapd.conf
Could not connect to kernel driver.
Could not set channel for kernel driver
rmdir[ctrl_interface]: No such file or directory

*and the wlan0 interface which is up and running previously goes down and I
force it go up by ifconfig and then it goes up and as soon as I run the
command above, it goes down. Here's what happens to /var/log/syslog:

*Jul 23 23:53:02 pineapple avahi-daemon[4860]: Interface wlan0.IPv4 no
longer relevant for mDNS.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Leaving mDNS multicast group
on interface wlan0.IPv4 with address 192.168.1.1.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Withdrawing address record for
192.168.1.1 on wlan0.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Joining mDNS multicast group
on interface wlan0.IPv4 with address 192.168.1.1.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: New relevant interface
wlan0.IPv4 for mDNS.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Registering new address record
for 192.168.1.1 on wlan0.IPv4.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Interface wlan0.IPv4 no longer
relevant for mDNS.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Leaving mDNS multicast group
on interface wlan0.IPv4 with address 192.168.1.1.
Jul 23 23:53:02 pineapple avahi-daemon[4860]: Withdrawing address record for
192.168.1.1 on wlan0.
*
I have a strong feeling that I broke something in the code but I don't know
what has gone wrong:

1. How do I debug it?
2. Can somebody look at the code changes I made and respond as to what I
might have goofed up with, everthing - also hostapd - works fine without the
code changed both with 2.6.30 and 2.6.31 versions.

--
Rakesh

Rakesh Wrote:

*Hi,

I made a few small changes in nl80211.c (cfg80211) and cfg.c (mac80211) for
supporting explicit rate setting (say if the user wants to set a fixed rate
and avoid usage of rate control algo). Anyway, I compiled everything and can
load both cfg80211 and mac80211 but when it comes to loading ath9k, I get an
error message on the command line saying:

rakesh at pineapple:~/compat-wireless-2.6.30$ sudo insmod
./drivers/net/wireless/ath9k/ath9k.ko
insmod: error inserting './drivers/net/wireless/ath9k/ath9k.ko': -1 Unknown
symbol in module

and the syslog reads:

Jul 23 17:30:41 pineapple kernel: [ 4486.158281] ath9k: Unknown symbol
rfkill_force_state
Jul 23 17:30:41 pineapple kernel: [ 4486.158486] ath9k: Unknown symbol
rfkill_unregister
Jul 23 17:30:41 pineapple kernel: [ 4486.159220] ath9k: Unknown symbol
led_classdev_unregister
Jul 23 17:30:41 pineapple kernel: [ 4486.161183] ath9k: Unknown symbol
rfkill_free
Jul 23 17:30:41 pineapple kernel: [ 4486.161619] ath9k: Unknown symbol
rfkill_allocate
Jul 23 17:30:41 pineapple kernel: [ 4486.161817] ath9k: Unknown symbol
rfkill_register
Jul 23 17:30:41 pineapple kernel: [ 4486.162403] ath9k: Unknown symbol
led_classdev_register


Can somebody help as to what  might be causing this problem, I did not touch
the ath9k code at all. I tried to grep these symbol names in the code but do
not finy clue except them being called in main.c of ath9k.

For the record, I made following changes in nl80211.c:

diff compat-wireless-2.6.30/net/wireless/nl80211.c
compat-wireless-2.6.30_fresh/net/wireless/nl80211.c
63a64
>
65,66d65
< //Rakesh:
<     [NL80211_ATTR_IFRATE] = { .type = NLA_U32 },
482a482
>
695,731d694
< //Rakesh:
< static int nl80211_set_rate(struct sk_buff *skb, struct genl_info *info)
< {
<     struct cfg80211_registered_device *drv;
<     int err, ifindex;
<     unsigned int rate;
<
<     struct net_device *dev;
<     bool change = false;
<
<     rtnl_lock();
<
<     err = get_drv_dev_by_info_ifindex(*
*info->attrs, &drv, &dev);
<     if (err)
<         goto unlock_rtnl;
<
<     ifindex = dev->ifindex;
<
<     dev_put(dev);
<
<     if (info->attrs[NL80211_ATTR_**IFRATE]) {
<         rate = nla_get_u32(info->attrs[**NL80211_ATTR_IFTYPE]);
<         change = true;
<     }
<
<     if (change)
<         err = drv->ops->change_intf_rate(&**drv->wiphy, ifindex,
<                             rate);
<     else
<         err = 0;
<  unlock:
<     cfg80211_put_dev(drv);
<  unlock_rtnl:
<     rtnl_unlock();
<     return err;
< }
<
3055,3061d3017
< //Rakesh:
<     {
<         .cmd = NL80211_CMD_SET_RATE,
<         .doit = nl80211_set_rate,
<         .policy = nl80211_policy,
<         .flags = GENL_ADMIN_PERM,
<     },

and following changes in cfg.c

diff compat-wireless-2.6.30/net/**mac80211/cfg.c
compat-wireless-2.6.30_fresh/**net/mac80211/cfg.c
113,132d112
< static int ieee80211_change_rate(struct wiphy *wiphy, int ifindex,
<                   unsigned int rate)
< {
<     struct net_device *dev;
<     struct ieee80211_sub_if_data *sdata;
<     int ret;
<
<     /* we're under RTNL */
<     dev = __dev_get_by_index(&init_net, ifindex);
<     if (!dev)
<         return -ENODEV;
<
<     sdata = IEEE80211_DEV_TO_SUB_IF(dev);
<
<     sdata->force_unicast_rateidx = rate;
<     return 0;
< }
<
<
<
1313,1314d1292
< //Rakesh
<     .change_intf_rate = ieee80211_change_rate,

And following changes in cfg80211.h

rakesh@pineapple:~$ diff compat-wireless-2.6.30/* *include/net/
compat-wireless-2.6.30_fresh/**include/net/
diff compat-wireless-2.6.30/**include/net/cfg80211.h
compat-wireless-2.6.30_fresh/**include/net/cfg80211.h
749,752c749
< //Rakesh:
<     int    (*change_intf_rate)(struct wiphy *wiphy, int ifindex,
<                        unsigned int type);
<
---
>


And following changes in nl80211.h

rakesh at pineapple:~$ diff compat-wireless-2.6.30/* *include/linux/nl80211.h
compat-wireless-2.6.30_fresh/**include/linux/nl80211.h
218,219d217
< //Rakesh:
<     NL80211_CMD_SET_RATE,
426,427d423
< //Rakesh:
<     NL80211_ATTR_IFRATE,*
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