multiwan bonding

#!/bin/sh

remote=1.2.3.4 # MIX server
dev=eth0.1036
modules='ip_gre macvlan bonding'
sn=D-W1234567890123
snh=57313233343536373839303930313

loadmodules() {
    for i in $modules; do
        grep -q $i /proc/modules || modprobe $i
    done
}

unloadmodules() {
    for i in $modules; do
        grep -q $i /proc/modules && modprobe -r $i
    done
}

localinit() {
    loadmodules

    ip addr add 10.0.0.2/24 dev bond0
    ip link set dev grezz$i up
    iptables -t mangle -A FORWARD -o bond0 -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
    iptables -t nat -A POSTROUTING -o bond0 -j MASQUERADE
    ip route add default via 10.0.0.1
}

localadd() {
    i=$(awk -F'grezz|:' '/^grezz/{m=$2 > m ? $2 : m}END{print m}' /proc/net/dev)
    i=$((i + 1))
    mac=$(ip link show dev $dev |awk '/ether/{print$2}')
    macx=$(echo $mac |awk -F: '{printf $1":"$2":"$3":"$4":"$5":%02x", xor(strtonum("0x"$6),'"$i)}")

    ip link add link $dev veth$i address $macx type macvlan
    ip link set dev veth$i up
    pppd debug updetach call data ifname pppoe$i user $sn$i password 'VJ|5.4.8.1.160.8.24|RA|CGN=1|pw=Vodafone' veth$i host-uniq $snh$i nodefaultroute
    ip=$(ip addr show dev pppoe$i |awk '/inet/{print$2}')

    ip rule add from $ip table 100$i
    ip route add default dev pppoe$i table 100$i

    ip link add grezz$i type gretap local $ip remote $remote
    ip link set dev grezz$i up
    ssh -b $ip $remote 'multiwan remoteadd'
    ifenslave bond0 grezz$i
}

localcleanup() {
    killall -w pppd
    unloadmodules
    i=1001
    while ip rule del lookup $i; do i=$((i + 1)); done
    iptables -t mangle -D FORWARD -o bond0 -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
    iptables -t nat -D POSTROUTING -o bond0 -j MASQUERADE
}

remoteinit() {
    loadmodules

    ip addr add 10.0.0.1/24 dev bond0
    ip link set dev bond0 up mtu 1454
}

remoteadd() {
    i=$(awk -F'grezz|:' '/^grezz/{print $2}' /proc/net/dev)
    i=$((i + 1))
    ip link add grezz$i type gretap remote ${SSH_CLIENT%% *}
    ip link set dev grezz$i up
    ifenslave bond0 grezz$i
}

remotecleanup() {
    unloadmodules
    i=1001
    while ip rule del lookup $i; do i=$((i + 1)); done
}

$1