how to install madwifi driver for linux with and with out resend packets option.

Madwifi driver is basically written for Atheros chipsets and it supports most
It is a open source but depends on the proprietary Hardware Abstraction Layer (HAL).

Download and Check

$ wget http://ufpr.dl.sourceforge.net/sourceforge/madwifi/madwifi-0.9.4.tar.bz2
$ tar -zxvf madwifi-0.9.4.tar.bz2
$ cd madwifi-0.9.4/
$ cd scripts/
$ ./madwifi-unload.bash
$ ./find-madwifi-modules.sh $(uname -r)
$ cd ..

Build and comment

$ make

Checking requirements… ok.
Checking kernel configuration… ok.
make -C /lib/modules/2.6.18-92.1.13.el5/build SUBDIRS=/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4 modules
make[1]: Entering directory `/usr/src/kernels/2.6.18-92.1.13.el5-i686′
CC [M] /home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/ath/if_ath.o
In file included from :1:
/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/ath/../include/compat.h:140: error: redefinition of ’skb_end_pointer’
….
….
….
make[3]: *** [/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/ath/if_ath.o] Error 1
make[2]: *** [/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/ath Error 2
make[1]: *** [_module_/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4] Error 2
make[1]: Leaving directory `/usr/src/kernels/2.6.18-92.1.13.el5-i686′
make: *** [modules] Error 2

$ cd include
$ cp compat.h compat.h.old
$ vim compat.h
$ diff -U 3 -dHrN -- compat.h compat.h.old
$cat compat.h.diff


— compat.h 2009-03-19 02:02:49.000000000 -0400
+++ compat.h.old 2009-03-18 19:09:37.000000000 -0400
@@ -134,7 +134,7 @@
#define IRQF_SHARED SA_SHIRQ
#endif
-/* #if LINUX_VERSION_CODE <>mac.raw = skb->data;
}
-#endif */
+#endif
#if LINUX_VERSION_CODE <>$ cd ../
$ make

Checking requirements… ok.
Checking kernel configuration… ok.
make -C /lib/modules/2.6.18-92.1.13.el5/build SUBDIRS=/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4 modules
make[1]: Entering directory `/usr/src/kernels/2.6.18-92.1.13.el5-i686′
CC [M] /home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/ath/if_ath.o
…
…
…
make[1]: Entering directory `/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/tools’
gcc -o athstats -g -O2 -Wall -I. -I../hal -I.. -I../ath athstats.c
gcc -o 80211stats -g -O2 -Wall -I. -I../hal -I.. 80211stats.c
gcc -o athkey -g -O2 -Wall -I. -I../hal -I.. athkey.c
gcc -o athchans -g -O2 -Wall -I. -I../hal -I.. athchans.c
gcc -o athctrl -g -O2 -Wall -I. -I../hal -I.. athctrl.c
gcc -o athdebug -g -O2 -Wall -I. -I../hal -I.. athdebug.c
gcc -o 80211debug -g -O2 -Wall -I. -I../hal -I.. 80211debug.c
gcc -o wlanconfig -g -O2 -Wall -I. -I../hal -I.. wlanconfig.c
gcc -o ath_info -g -O2 -Wall ath_info.c
make[1]: Leaving directory `/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/tools’

# make install

sh scripts/find-madwifi-modules.sh 2.6.18-92.1.13.el5
for i in ath/ ath_hal/ ath_rate/ net80211/; do \
make -C $i install || exit 1; \
done
…
…
…
install -d /usr/local/man/man8
install -m 0644 man/*.8 /usr/local/man/man8
make[1]: Leaving directory `/home/rafa/0_Down/1_Source/WireLess/madwifi-0.9.4/tools’

Configuration and re-boot

# modprob ath_pci
# iwconfig

lo no wireless extensions.

eth1 no wireless extensions.

eth2 no wireless extensions.

sit0 no wireless extensions.

wifi0 no wireless extensions.

ath0 IEEE 802.11b ESSID:”"

Mode:Managed Channel:0 Access Point: Not-Associated
Bit Rate:0 kb/s Tx-Power:0 dBm Sensitivity=1/1
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=0/70 Signal level=-256 dBm Noise level=-256 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

# ifconfig ath0 up
# wlanconfig ath0 list scan


show all available bssid's

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If your doing protocol test and you want to have control how many packets are going from your wifi interface. You need to do simple two steps before compiling.

step 1:-

In madwifi-0.9.4/ath/if_athvar.h file change line '#define ATH_TXMAXTRY 11' to '#define ATH_TXMAXTRY 1'.

step 2:-

In madwifi-0.9.4/ath/if_ath.c file change line 'sc -> sc_mrretry = ath_hal_setupxtxdesc(ath, NULL, 0,0,0,0,0,0);' with 'sc-> sc_mrretry=0'.

In place of '0' you can write FALSE and add macro for it.

Now start compilation.

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