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Diffstat (limited to 'builder/modules.d/wlan-boot/README')
| -rw-r--r-- | builder/modules.d/wlan-boot/README | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/builder/modules.d/wlan-boot/README b/builder/modules.d/wlan-boot/README new file mode 100644 index 00000000..71bc5ff5 --- /dev/null +++ b/builder/modules.d/wlan-boot/README @@ -0,0 +1,152 @@ +############################################ +### README DRACUT MODUL FOR WLAN SUPPORT ### +############################################ + +SHORT LIST OF FILES +============= + +/hooks +/hooks/parse-wlan-kernel-command-line-parameter.sh +/hooks/start_wlan.sh +/hooks/prepare-newroot.sh +/services +/services/dhcp.service +/services/wpa_supplicant.service +/udev +/udev/80-net-wlan.rules +/binaries +/binaries/systemd-preserve-process-marker +/binaries/dhcpcd +/scripts +/scripts/dhcpcd-hooks +/scripts/dhcpcd-hooks/20-resolv.conf +/scripts/dhcpcd-hooks/10-wpa_supplicant +/scripts/dhcpcd-run-hooks +/certs +/certs/Deutsche_Telekom_Root_CA_2.pem +/debug +/debug/services +/debug/services/debug-shell.service +/debug/binaries +/debug/binaries/busybox.tar +/debug/hooks +/debug/hooks/install_busybox.sh +/debug/scripts +/debug/scripts/restart_wpa.sh +/module-setup.sh +/chroot + + +WIFI DRIVER AND CHIP +==================== + +this module was built with the iwlwifi Linux kernel driver and tested with Intel Corporation Centrino Wireless-N 100 + + +BUILDING THE INITRAMFS +====================== + +./build-initramfs.sh -s -d -p initramfs-wlan - --add "wlan crypt" + + +KERNEL COMMAND LINE EXAMPLE FOR EDUROAM +======================================= + +../vmlinuz-centos-old slxsrv=132.230.8.90 slxbase=slx/cos7/ rd.shell rd.break=switch-root ssid=eduroam user=testoslx@hs-offenburg.de pw=password123 + + +SEQUENCE +======== + + ----------------------- cmdline + / | + / | + parse the command line | + v + ----------------------- udev + / | + / | + set the interface name | + v + pre-mount ------------------------ + | \ + | \ + | ------- start wlan ------- + v / \ + ---------------------- pre-pivot / \ + / set link up start dhcpcd.service ------ + / \ + prepare newroot \ + start wpa_supplicant.service + + + + +HOOKS +===== + +cmdline +------- + +/hooks/parse-wlan-kernel-command-line-parameter.sh +search the command line for 'ssid=' and 'pw=' and generates the wpa_supplicant configuration file /etc/wpa_supplicant.conf If you connect to eduroam you also need 'user='. It is important for dhcpcd that the config file includes the path to the ctrl_interface. + + +pre-mount +--------- + +/hooks/start_wlan.sh +this script sets up the wlan interface and starts the dhcp.service. The dhcp.service runs the dhcp client dhcpcd which starts the wpa_supplicant.service if no wpa_supplicant already running. The script is waiting until its possible to ping the slxsrv from the command line. + + +pre-pivot +--------- + +/hooks/prepare-newroot.sh +copy files to the new system and disable NetworkManager + + + +SERVICES +======== + +/services/dhcp.service +this service manages the dhcp client dhcpcd. It will be invoked by the start_wlan.sh script while pre-mount. + +/services/wpa_supplicant.service +this service manages the wpa_supplicant. It will be invoked by dhcpcd. + + +DHCP +==== + +dhcpcd +------ + +the dhcp client we use is dhcpcd. dhcpcd runs /libexec/dhcpcd-run-hooks if an event occurs like no carrier is available. We want to use this hook event to restart wpa_supplicant every time we lost the connection. But in fact it doesnt work after the switch root, cause of any reason dhcpcd doesnt run the script. + + +dhcpcd-run-hooks +---------------- + +dhcpcd-run-hooks is used by dhcpcd to run any system and user defined hook scripts. It executes all scripts in /libexec/dhcpcd-hooks/. + + +/debug/scripts/restart_wpa.sh +----------------------------- + +this script restarts the wpa_supplicant + +DEBUG +===== + +rescue shell +------------ + +after the new system booted you have a busybox available on tty9. You can use this if you lost the connection after the switch root. + + +CHROOT +====== + +here you find an environment which provides dhcpcd and wpa_supplicant. It isnt included automaticly, because its not really tested. For more Information you find some manual steps at chroot/README. |