create_ap

create a nat-ed wifi ap
git clone git://git.2f30.org/create_ap.git
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commit 6a3e1d98abbf378138dab8d11c4d260b84a0fbbf
parent 0ba638f7808ab3019bf8b02ebe354556f7f084eb
Author: oblique <psyberbits@gmail.com>
Date:   Thu Sep  4 01:41:02 +0300

Initialize correctly the bridge interface

To initialize the bridge interface correctly we need to do the following:

   1) duplicate the IPs of INTERNET_IFACE to BRIDGE_IFACE
   2) duplicate routing table of INTERNET_IFACE to BRIDGE_IFACE
   3) delete routing table of INTERNET_IFACE

   NOTE: we don't need to delete the IPs of INTERNET_IFACE

We need the above because BRIDGE_IFACE is the master interface from now on
and it must know where is connected, otherwise connection is lost.

Fix #19

Diffstat:
create_ap | 48++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+), 0 deletions(-)
diff --git a/create_ap b/create_ap @@ -345,6 +345,16 @@ cleanup() { iptables -D FORWARD -i ${INTERNET_IFACE} -d ${GATEWAY%.*}.0/24 -j ACCEPT > /dev/null 2>&1 [[ -n $OLD_IP_FORWARD ]] && echo $OLD_IP_FORWARD > /proc/sys/net/ipv4/ip_forward elif [[ "$SHARE_METHOD" == "bridge" ]]; then + ip route show dev $BRIDGE_IFACE | grep -v -E '^default' | while read x; do + ip route del $x dev $BRIDGE_IFACE + ip route add $x dev $INTERNET_IFACE + done + + ip route show dev $BRIDGE_IFACE | grep -E '^default' | while read x; do + ip route del $x dev $BRIDGE_IFACE + ip route add $x dev $INTERNET_IFACE + done + ip link set down $BRIDGE_IFACE brctl delbr $BRIDGE_IFACE [[ -n $OLD_BRIDGE_IPTABLES ]] && echo $OLD_BRIDGE_IPTABLES > /proc/sys/net/bridge/bridge-nf-call-iptables @@ -686,7 +696,45 @@ if [[ "$SHARE_METHOD" != "none" ]]; then # create and initialize bridged interface brctl addbr ${BRIDGE_IFACE} || die brctl addif ${BRIDGE_IFACE} ${INTERNET_IFACE} || die + + # to initialize the bridge interface correctly we need to do the following: + # + # 1) duplicate the IPs of INTERNET_IFACE to BRIDGE_IFACE + # 2) duplicate routing table of INTERNET_IFACE to BRIDGE_IFACE + # 3) delete routing table of INTERNET_IFACE + # NOTE: we don't need to delete the IPs of INTERNET_IFACE + # + # we need the above because BRIDGE_IFACE is the master interface from now on + # and it must know where is connected, otherwise connection is lost. ip link set dev ${BRIDGE_IFACE} up || die + + ip addr show $INTERNET_IFACE | grep -E '[[:blank:]]+inet ' | while read x; do + IPADDR=$(echo $x | sed 's/inet \([^ ]*\).*/\1/') + BRDADDR= + if [[ $x == *\ brd\ * ]]; then + BRDADDR=$(echo $x | sed 's/.* brd \([^ ]*\).*/\1/') + fi + if [[ -n "$BRDADDR" ]]; then + ip addr add $IPADDR broadcast $BRDADDR dev $BRIDGE_IFACE || die + else + ip addr add $IPADDR dev $BRIDGE_IFACE || die + fi + done + + # remove any existing entries that were added from 'ip addr add' + ip route flush dev $BRIDGE_IFACE || die + + # we must first add the entries that specify the subnets and then the + # gateway entry, otherwise 'ip addr add' will return an error + ip route show dev $INTERNET_IFACE | grep -v -E '^default' | while read x; do + ip route del $x dev $INTERNET_IFACE || die + ip route add $x dev $BRIDGE_IFACE || die + done + + ip route show dev $INTERNET_IFACE | grep -E '^default' | while read x; do + ip route del $x dev $INTERNET_IFACE || die + ip route add $x dev $BRIDGE_IFACE || die + done fi else echo "No Internet sharing"