hostap/wpa_supplicant/examples/p2p-action.sh
Jouni Malinen 25ef8529c1 P2P: Add support for IP address assignment in 4-way handshake
This new mechanism allows P2P Client to request an IPv4 address from the
GO as part of the 4-way handshake to avoid use of DHCP exchange after
4-way handshake. If the new mechanism is used, the assigned IP address
is shown in the P2P-GROUP-STARTED event on the client side with
following new parameters: ip_addr, ip_mask, go_ip_addr. The assigned IP
address is included in the AP-STA-CONNECTED event on the GO side as a
new ip_addr parameter. The IP address is valid for the duration of the
association.

The IP address pool for this new mechanism is configured as global
wpa_supplicant configuration file parameters ip_addr_go, ip_addr_mask,
ip_addr_star, ip_addr_end. For example:

ip_addr_go=192.168.42.1
ip_addr_mask=255.255.255.0
ip_addr_start=192.168.42.2
ip_addr_end=192.168.42.100

DHCP mechanism is expected to be enabled at the same time to support P2P
Devices that do not use the new mechanism. The easiest way of managing
the IP addresses is by splitting the IP address range into two parts and
assign a separate range for wpa_supplicant and DHCP server.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2014-01-27 21:44:26 +02:00

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#!/bin/sh
IFNAME=$1
CMD=$2
kill_daemon() {
NAME=$1
PF=$2
if [ ! -r $PF ]; then
return
fi
PID=`cat $PF`
if [ $PID -gt 0 ]; then
if ps $PID | grep -q $NAME; then
kill $PID
fi
fi
rm $PF
}
if [ "$CMD" = "P2P-GROUP-STARTED" ]; then
GIFNAME=$3
if [ "$4" = "GO" ]; then
kill_daemon dhclient /var/run/dhclient-$GIFNAME.pid
rm /var/run/dhclient.leases-$GIFNAME
kill_daemon dnsmasq /var/run/dnsmasq.pid-$GIFNAME
ifconfig $GIFNAME 192.168.42.1 up
if ! dnsmasq -x /var/run/dnsmasq.pid-$GIFNAME \
-i $GIFNAME \
-F192.168.42.11,192.168.42.99; then
# another dnsmasq instance may be running and blocking us; try to
# start with -z to avoid that
dnsmasq -x /var/run/dnsmasq.pid-$GIFNAME \
-i $GIFNAME \
-F192.168.42.11,192.168.42.99 --listen-address 192.168.42.1 -z
fi
fi
if [ "$4" = "client" ]; then
kill_daemon dhclient /var/run/dhclient-$GIFNAME.pid
rm /var/run/dhclient.leases-$GIFNAME
kill_daemon dnsmasq /var/run/dnsmasq.pid-$GIFNAME
ipaddr=`echo "$*" | sed 's/.* ip_addr=\([^ ]*\).*/\1/'`
ipmask=`echo "$*" | sed 's/.* ip_mask=\([^ ]*\).*/\1/'`
goipaddr=`echo "$*" | sed 's/.* go_ip_addr=\([^ ]*\).*/\1/'`
if echo "$ipaddr$ipmask$goipaddr" | grep -q ' '; then
ipaddr=""
ipmask=""
goipaddr=""
fi
if [ -n "$ipaddr" ]; then
sudo ifconfig $GIFNAME "$ipaddr" netmask "$ipmask"
sudo ip ro re default via "$goipaddr"
exit 0
fi
dhclient -pf /var/run/dhclient-$GIFNAME.pid \
-lf /var/run/dhclient.leases-$GIFNAME \
-nw \
$GIFNAME
fi
fi
if [ "$CMD" = "P2P-GROUP-REMOVED" ]; then
GIFNAME=$3
if [ "$4" = "GO" ]; then
kill_daemon dnsmasq /var/run/dnsmasq.pid-$GIFNAME
ifconfig $GIFNAME 0.0.0.0
fi
if [ "$4" = "client" ]; then
kill_daemon dhclient /var/run/dhclient-$GIFNAME.pid
rm /var/run/dhclient.leases-$GIFNAME
ifconfig $GIFNAME 0.0.0.0
fi
fi
if [ "$CMD" = "P2P-CROSS-CONNECT-ENABLE" ]; then
GIFNAME=$3
UPLINK=$4
# enable NAT/masquarade $GIFNAME -> $UPLINK
iptables -P FORWARD DROP
iptables -t nat -A POSTROUTING -o $UPLINK -j MASQUERADE
iptables -A FORWARD -i $UPLINK -o $GIFNAME -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i $GIFNAME -o $UPLINK -j ACCEPT
sysctl net.ipv4.ip_forward=1
fi
if [ "$CMD" = "P2P-CROSS-CONNECT-DISABLE" ]; then
GIFNAME=$3
UPLINK=$4
# disable NAT/masquarade $GIFNAME -> $UPLINK
sysctl net.ipv4.ip_forward=0
iptables -t nat -D POSTROUTING -o $UPLINK -j MASQUERADE
iptables -D FORWARD -i $UPLINK -o $GIFNAME -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -D FORWARD -i $GIFNAME -o $UPLINK -j ACCEPT
fi