# Copyright (C) 2009-2010 OpenWrt.org fw__uci_state_add() { local var="$1" local item="$2" local val="$(uci_get_state firewall core $var)" uci_set_state firewall core $var "${val:+$val }$item" } fw__uci_state_del() { local var="$1" local item="$2" local val=" $(uci_get_state firewall core $var) " val="${val// $item / }" val="${val# }" val="${val% }" uci_set_state firewall core $var "$val" } fw_configure_interface() { local iface=$1 local action=$2 local ifname=$3 local aliasnet=$4 [ "$action" == "add" ] && { local status=$(uci_get_state network "$iface" up 0) [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0 } [ -n "$ifname" ] || { ifname=$(uci_get_state network "$iface" ifname) ifname="${ifname%%:*}" [ -z "$ifname" ] && return 0 } [ "$ifname" == "lo" ] && return 0 fw_callback pre interface fw__do_rules() { local action=$1 local zone=$2 local chain=zone_${zone} local ifname=$3 local subnet=$4 local inet onet mode fw_get_family_mode mode x $zone i case "$mode/$subnet" in # Zone supports v6 only or dual, need v6 G6/*:*|i/*:*) inet="-s $subnet -d ::/0" onet="-s ::/0 -d $subnet" mode=6 ;; # Zone supports v4 only or dual, need v4 G4/*.*.*.*|i/*.*.*.*) inet="-s $subnet -d 0.0.0.0/0" onet="-s 0.0.0.0/0 -d $subnet" mode=4 ;; # Need v6 while zone is v4 */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;; # Need v4 while zone is v6 */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;; # Strip prefix *) mode="${mode#G}" ;; esac lock /var/run/firewall-interface.lock fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet } fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet } fw $action $mode f ${chain}_DROP DROP $ { -o "$ifname" $onet } fw $action $mode f ${chain}_DROP DROP $ { -i "$ifname" $inet } fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet } fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet } fw $action $mode f ${chain}_MSSFIX TCPMSS $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet } fw $action $mode f input ${chain} $ { -i "$ifname" $inet } fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet } fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet } fw $action $mode r PREROUTING ${chain}_notrack $ { -i "$ifname" $inet } fw $action $mode n POSTROUTING ${chain}_nat $ { -o "$ifname" $onet } lock -u /var/run/firewall-interface.lock } local old_zones old_ifname old_subnets config_get old_zones core "${iface}_zone" [ -n "$old_zones" ] && { config_get old_ifname core "${iface}_ifname" config_get old_subnets core "${iface}_subnets" local z for z in $old_zones; do local n for n in ${old_subnets:-""}; do fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z" fw__do_rules del $z $old_ifname $n done [ -n "$old_subnets" ] || { fw__uci_state_del "${z}_networks" "$iface" env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall } done local old_aliases config_get old_aliases core "${iface}_aliases" local a for a in $old_aliases; do fw_configure_interface "$a" del "$old_ifname" done uci_revert_state firewall core "${iface}_zone" uci_revert_state firewall core "${iface}_ifname" uci_revert_state firewall core "${iface}_subnets" uci_revert_state firewall core "${iface}_aliases" } [ "$action" == del ] && return [ -z "$aliasnet" ] && { local aliases config_get aliases "$iface" aliases local a for a in $aliases; do local ipaddr netmask ip6addr config_get ipaddr "$a" ipaddr config_get netmask "$a" netmask config_get ip6addr "$a" ip6addr [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}" [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr" done fw_sysctl_interface $ifname fw_callback post interface uci_set_state firewall core "${iface}_aliases" "$aliases" } || { local subnets= config_get subnets core "${iface}_subnets" append subnets "$aliasnet" config_set core "${iface}_subnets" "$subnets" uci_set_state firewall core "${iface}_subnets" "$subnets" } local new_zones= load_zone() { fw_config_get_zone "$1" list_contains zone_network "$iface" || return fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name" fw__do_rules add ${zone_name} "$ifname" "$aliasnet" append new_zones $zone_name [ -n "$aliasnet" ] || { fw__uci_state_add "${zone_name}_networks" "${zone_network}" env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall } } config_foreach load_zone zone uci_set_state firewall core "${iface}_zone" "$new_zones" uci_set_state firewall core "${iface}_ifname" "$ifname" } fw_sysctl_interface() { local ifname=$1 { sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE } >/dev/null 2>/dev/null }