OpenWrt – Rev 3

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#!/bin/sh /etc/rc.common
# Copyright (C) 2010-2014 OpenWrt.org

START=99
USE_PROCD=1
PROG=/usr/sbin/omcproxy

# Uncomment to enable verbosity 
#OPTIONS="-v" 
PROXIES=""


omcproxy_add_proxy() {
        local uplink downlink scope proxy
        config_get uplink $1 uplink
        config_get downlink $1 downlink
        config_get scope $1 scope

        proxy=""

        network_get_device updev $uplink
        [ -n "$updev" ] || return 0

        for network in $downlink; do
                network_get_device downdev $network
                [ -n "$downdev" ] && proxy="$proxy,$downdev"

                # Disable in-kernel querier while ours is active
                [ -f /sys/class/net/$downdev/bridge/multicast_querier ] && \
                        echo 0 > /sys/class/net/$downdev/bridge/multicast_querier
        done

        [ -n "$proxy" ] || return 0
        [ -n "$scope" ] && proxy="$proxy,scope=$scope"

        PROXIES="$PROXIES $updev$proxy"

}

omcproxy_add_trigger() {
        local uplink downlink
        config_get uplink $1 uplink
        config_get downlink $1 downlink

        for network in $uplink $downlink; do
                procd_add_interface_trigger "interface.*" $network /etc/init.d/omcproxy restart
        done
}

omcproxy_add_firewall() {
        config_get uplink $1 uplink
        config_get downlink $1 downlink

        upzone=$(fw3 -q network $uplink 2>/dev/null)
        [ -n "$upzone" ] || return 0

        json_add_object ""
        json_add_string type rule
        json_add_string src "$upzone"
        json_add_string proto igmp
        json_add_string target ACCEPT
        json_close_object

        json_add_object ""
        json_add_string type rule
        json_add_string family ipv6
        json_add_string src "$upzone"
        json_add_string proto icmp
        json_add_string src_ip fe80::/10
        json_add_array icmp_type
                json_add_string "" 130/0
                json_add_string "" 131/0
                json_add_string "" 132/0
                json_add_string "" 143/0
        json_close_array
        json_add_string target ACCEPT
        json_close_object

        for network in $downlink; do
                downzone=$(fw3 -q network $network 2>/dev/null)
                [ -n "$downzone" ] || continue

                json_add_object ""
                json_add_string type rule
                json_add_string src "$upzone"
                json_add_string dest "$downzone"
                json_add_string family ipv4
                json_add_string proto any
                json_add_string dest_ip "224.0.0.0/4"
                json_add_string target ACCEPT
                json_close_object

                json_add_object ""
                json_add_string type rule
                json_add_string src "$upzone"
                json_add_string dest "$downzone"
                json_add_string family ipv6
                json_add_string proto any
                json_add_string dest_ip "ff00::/8"
                json_add_string target ACCEPT
                json_close_object
        done
}

service_triggers() {
        procd_add_reload_trigger "omcproxy"
}

start_service() {
        include /lib/functions

        config_load omcproxy
        config_foreach omcproxy_add_proxy proxy

        [ -n "$PROXIES" ] || return 0

        procd_open_instance
        procd_set_param command $PROG
        [ -n "$OPTIONS" ] && procd_append_param command $OPTIONS
        procd_append_param command $PROXIES
        procd_set_param respawn

        procd_open_trigger
        config_foreach omcproxy_add_trigger proxy
        procd_close_trigger

        procd_open_data

        json_add_array firewall
        config_foreach omcproxy_add_firewall proxy
        json_close_array

        procd_close_data

        procd_close_instance

        # Increase maximum IPv4 group memberships per socket
        echo 128 > /proc/sys/net/ipv4/igmp_max_memberships
}

service_started() {
        procd_set_config_changed firewall
}