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Initialize correctly the bridge interface

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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
This commit is contained in:
oblique 2014-09-04 01:41:02 +03:00
parent 0ba638f780
commit 6a3e1d98ab
1 changed files with 48 additions and 0 deletions
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48
create_ap
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@ -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"