opkg install kmod-bridge 

config interface lan
        option type bridge
        option igmp_snooping 1
        ...

echo "1" > /sys/devices/virtual/net/br-lan/bridge/multicast_snooping

root@OpenWrt:~# opkg install kmod-bridge
Package kmod-bridge (3.18.23-1) installed in root is up to date.

root@OpenWrt:~# cat /etc/config/network
config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd45:7c2f:9c87::/48'

config interface 'lan'
        option ifname 'eth1'
        option force_link '1'
        option type 'bridge'
        option igmp_snooping '1'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option ifname 'eth0'
        option proto 'dhcp'
        option macaddr '00:12:2a:xx:xx:xy'

config interface 'wan6'
        option ifname 'eth0'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'
        option enable_vlan4k '1'
        option mirror_source_port '0'
        option mirror_monitor_port '0'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option ports '0 2 3 4 5'
        option vid '1'

config switch_vlan
        option device 'switch0'
        option vlan '2'
        option ports '1 6'
        option vid '2'

config interface 'IPTV'
        option proto 'dhcp'
        option ifname 'eth0.1000'
        option metric '20'
        option macaddr '00:12:2a:xx:xx:xx'
        option mtu '1496'
        option defaultroute '0'
        option vendorid 'NETIASPOT'

config switch_vlan
        option device 'switch0'
        option vlan '3'
        option vid '1000'
        option ports '0t 1t 6t'

root@OpenWrt:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         87.99.47.1      0.0.0.0         UG    0      0        0 eth0
10.204.32.0     0.0.0.0         255.255.240.0   U     20     0        0 eth0.1000
10.204.47.129   0.0.0.0         255.255.255.255 UH    20     0        0 eth0.1000
87.99.47.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
87.99.47.1      0.0.0.0         255.255.255.255 UH    0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 br-lan

root@OpenWrt:~# cat /etc/config/igmpproxy
config igmpproxy
        option quickleave 1

config phyint IPTV
        option network IPTV
        option direction upstream
        list altnet 224.0.0.0/4
        list altnet 10.0.0.0/8
        list altnet 195.0.0.0/8
        list altnet 172.24.0.0/16
        list altnet 172.28.0.0/16
        list altnet 192.168.1.0/24
        list altnet 83.238.252.0/24

config phyint lan
        option network lan
        option direction downstream

phyint lo disabled
phyint eth0 disabled

root@OpenWrt:~# cat /etc/config/firewall

config defaults
        option syn_flood '1'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'REJECT'

config zone
        option name 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
        option network 'lan'

config zone
        option name 'wan'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
        option network 'wan wan6'

config forwarding
        option src 'lan'
        option dest 'wan'

config rule
        option name 'Allow-DHCP-Renew'
        option src 'wan'
        option proto 'udp'
        option dest_port '68'
        option target 'ACCEPT'
        option family 'ipv4'

config rule
        option name 'Allow-Ping'
        option src 'wan'
        option proto 'icmp'
        option icmp_type 'echo-request'
        option family 'ipv4'
        option target 'ACCEPT'

config zone
        option name 'IPTV'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
        option network 'IPTV'

config forwarding
        option src 'lan'
        option dest 'IPTV'

config rule
        option name 'Allow-DHCP-Renew-wan_iptv'
        option src 'IPTV'
        option proto 'udp'
        option dest_port '68'
        option target 'ACCEPT'
        option family 'ipv4'

config rule
        option src 'IPTV'
        option proto 'igmp'
        option target 'ACCEPT'

config rule
        option src 'IPTV'
        option proto 'udp'
        option dest_ip '224.0.0.0/4'
        option target 'ACCEPT'

config include
        option path '/etc/firewall.user'

config rule
        option src 'wan'
        option dest 'lan'
        option proto 'esp'
        option target 'ACCEPT'

config rule
        option src 'wan'
        option dest 'lan'
        option dest_port '500'
        option proto 'udp'
        option target 'ACCEPT'

config include 'miniupnpd'
        option type 'script'
        option path '/usr/share/miniupnpd/firewall.include'
        option family 'any'
        option reload '1'

Mon Jan  4 22:46:04 2016 user.warn igmpproxy[2039]: select() failure; Errno(4): Interrupted system call
Mon Jan  4 22:46:04 2016 user.warn igmpproxy[2039]: MRT_DEL_MFC; Errno(2): No such file or directory
Mon Jan  4 22:46:04 2016 user.warn igmpproxy[2039]: MRT_DEL_MFC; Errno(2): No such file or directory
Mon Jan  4 22:46:04 2016 user.warn igmpproxy[2039]: MRT_DEL_MFC; Errno(2): No such file or directory
Mon Jan  4 22:47:00 2016 user.warn igmpproxy[2654]: The origin for route 239.255.255.250 changed from 192.168.1.5 to 192.168.1.4
Mon Jan  4 22:47:02 2016 user.warn igmpproxy[2654]: The origin for route 239.255.255.250 changed from 192.168.1.4 to 192.168.1.8
Mon Jan  4 22:47:03 2016 user.warn igmpproxy[2654]: The origin for route 239.255.255.250 changed from 192.168.1.8 to 192.168.1.5

root@OpenWrt:~# cat /etc/init.d/igmpproxy
#!/bin/sh /etc/rc.common
# Copyright (C) 2010-2014 OpenWrt.org

START=99
USE_PROCD=1
PROG=/usr/sbin/igmpproxy
CONFIGFILE=/var/etc/igmpproxy.conf

# igmpproxy supports both a debug mode and verbosity, which are very useful
# when something isn't working.
#
# Debug mode will print everything to stdout instead of syslog. Generally
# verbosity should NOT be set as it will quickly fill your syslog.
#
# Put any debug or verbosity options into IGMP_OPTS
#
# Examples:
# OPTIONS="-d -v -v" - debug mode and very verbose, this will land in
#                        stdout and not in syslog
# OPTIONS="-v" - be verbose, this will write aditional information to syslog

OPTIONS=""

igmp_header() {
    local quickleave
    config_get_bool quickleave "$1" quickleave 0

    mkdir -p /var/etc
    rm -f /var/etc/igmpproxy.conf
    [ $quickleave -gt 0 ] && echo "quickleave" >> /var/etc/igmpproxy.conf

    [ -L /etc/igmpproxy.conf ] || ln -nsf /var/etc/igmpproxy.conf /etc/igmpproxy.conf
}

igmp_add_phyint() {
    local network direction altnets device up

    config_get network $1 network
    config_get direction $1 direction
    config_get altnets $1 altnet

    local status="$(ubus -S call "network.interface.$network" status)"
    [ -n "$status" ] || return

    json_load "$status"
    json_get_var device l3_device
    json_get_var up up

    [ -n "$device" -a "$up" = "1" ] || {
        procd_append_param error "$network is not up"
        return;
    }

    append netdevs "$device"

    [[ "$direction" = "upstream" ]] && has_upstream=1

    echo -e "\nphyint $device $direction ratelimit 0 threshold 1" >> /var/etc/igmpproxy.conf

    if [ -n "$altnets" ]; then
        local altnet
        for altnet in $altnets; do
            echo -e "\taltnet $altnet" >> /var/etc/igmpproxy.conf
        done
    fi
}

igmp_add_network() {
    local network

    config_get network $1 network
    procd_add_interface_trigger "interface.*" $network /etc/init.d/igmpproxy reload
}

igmp_add_firewall_routing() {
    config_get network $1 network
    config_get direction $1 direction

    [[ "$direction" = "downstream" ]] || return 0

    json_add_object ""
    json_add_string type rule
    json_add_string src "$upstream"
    json_add_string dest "$network"
    json_add_string family ipv4
    json_add_string proto udp
    json_add_string dest_ip "224.0.0.0/4"
    json_add_string target ACCEPT
    json_close_object
}

igmp_add_firewall_network() {
    config_get network $1 network
    config_get direction $1 direction

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

    [[ "$direction" = "upstream" ]] && {
        upstream="$network"
        config_foreach igmp_add_firewall_routing phyint
    }
}

service_triggers() {
    procd_add_reload_trigger "igmpproxy"
}

start_service() {
    has_upstream=
    netdevs=
    config_load igmpproxy

    config_foreach igmp_header igmpproxy
    config_foreach igmp_add_phyint phyint

    procd_open_instance

    if [ -n "$has_upstream" ]; then
         procd_set_param command $PROG
         [ -n "$OPTIONS" ] && procd_append_param command $OPTIONS
         procd_append_param command $CONFIGFILE
    else
         # Ugly hack. This way we register interface trigger
         # without spawning igmpproxy
         procd_set_param command /bin/sleep 3600
    fi

    procd_set_param file $CONFIGFILE
    procd_set_param netdev $netdevs
    procd_set_param respawn
    # procd_open_trigger
    # config_foreach igmp_add_network phyint
    # procd_close_trigger

    procd_open_data

    json_add_array firewall
    config_foreach igmp_add_firewall_network phyint
    json_close_array

    procd_close_data

    procd_close_instance
}

service_started() {
    procd_set_config_changed firewall
}

option igmp_snooping '1'

config dhcp 'IPTV'
        option interface 'IPTV'
        option ignore '1'

config rule
        option name 'Allow-IGMP'
        option proto 'igmp'
        option family 'ipv4'
        option target 'ACCEPT'

Thu Jan  7 22:27:15 2016 user.warn igmpproxy[24992]: MRT_DEL_MFC; Errno(2): No such file or directory