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291f78f21a
- handle NAT reflection in firewall hotplug, solves synchronizing issues on boot - introduce masq_src and masq_dest options to limit zone masq to specific ip ranges, supports multiple subnets and negation git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22888 3c298f89-4303-0410-b956-a3cf2f4a3e73
181 lines
5.6 KiB
Bash
181 lines
5.6 KiB
Bash
# Copyright (C) 2009-2010 OpenWrt.org
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fw_configure_interface() {
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local iface=$1
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local action=$2
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local ifname=$3
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local aliasnet=$4
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[ "$action" == "add" ] && {
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local status=$(uci_get_state network "$iface" up 0)
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[ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
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}
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[ -n "$ifname" ] || {
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ifname=$(uci_get_state network "$iface" ifname)
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ifname="${ifname%%:*}"
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[ -z "$ifname" ] && return 0
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}
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[ "$ifname" == "lo" ] && return 0
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fw_callback pre interface
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fw__do_rules() {
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local action=$1
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local zone=$2
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local chain=zone_${zone}
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local ifname=$3
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local subnet=$4
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local masq_src=$5
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local masq_dest=$6
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local inet onet
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local mode=$(fw_get_family_mode x $zone i)
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case "$mode/$subnet" in
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# Zone supports v6 only or dual, need v6
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G6/*:*|i/*:*)
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inet="-s $subnet -d ::/0"
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onet="-s ::/0 -d $subnet"
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mode=6
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;;
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# Zone supports v4 only or dual, need v4
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G4/*.*.*.*|i/*.*.*.*)
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inet="-s $subnet -d 0.0.0.0/0"
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onet="-s 0.0.0.0/0 -d $subnet"
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mode=4
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;;
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# Need v6 while zone is v4
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*/*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
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# Need v4 while zone is v6
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*/*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
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esac
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fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
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fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
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fw $action $mode f ${chain}_DROP DROP $ { -o "$ifname" $onet }
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fw $action $mode f ${chain}_DROP DROP $ { -i "$ifname" $inet }
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fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
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fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
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# NB: if MASQUERADING for IPv6 becomes available we'll need a family check here
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local msrc mdst
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for msrc in ${masq_src:-0.0.0.0/0}; do
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[ "${msrc#!}" != "$msrc" ] && msrc="! -s ${msrc#!}" || msrc="-s $msrc"
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for mdst in ${subnet:-${masq_dest:-0.0.0.0/0}}; do
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[ "${mdst#!}" != "$mdst" ] && mdst="! -d ${mdst#!}" || mdst="-d $mdst"
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fw $action $mode n ${chain}_nat MASQUERADE $ { -o "$ifname" $msrc $mdst }
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done
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done
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fw $action $mode f ${chain}_MSSFIX TCPMSS $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
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fw $action $mode f input ${chain} $ { -i "$ifname" $inet }
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fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
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fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
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fw $action $mode r PREROUTING ${chain}_notrack $ { -i "$ifname" $inet }
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}
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local old_zones old_ifname old_subnets old_masq_src old_masq_dest
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config_get old_zones core "${iface}_zone"
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[ -n "$old_zones" ] && {
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config_get old_ifname core "${iface}_ifname"
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config_get old_subnets core "${iface}_subnets"
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config_get old_masq_src core "${iface}_masq_src"
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config_get old_masq_dest core "${iface}_masq_dest"
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local z
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for z in $old_zones; do
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local n
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for n in ${old_subnets:-""}; do
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fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
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fw__do_rules del $z $old_ifname $n "$old_masq_src" "$old_masq_dest"
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done
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[ -n "$old_subnets" ] || ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
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done
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local old_aliases
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config_get old_aliases core "${iface}_aliases"
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local a
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for a in $old_aliases; do
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fw_configure_interface "$a" del "$old_ifname"
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done
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uci_revert_state firewall core "${iface}_zone"
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uci_revert_state firewall core "${iface}_ifname"
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uci_revert_state firewall core "${iface}_subnets"
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uci_revert_state firewall core "${iface}_aliases"
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uci_revert_state firewall core "${iface}_masq_src"
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uci_revert_state firewall core "${iface}_masq_dest"
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}
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[ "$action" == del ] && return
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[ -z "$aliasnet" ] && {
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local aliases
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config_get aliases "$iface" aliases
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local a
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for a in $aliases; do
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local ipaddr netmask ip6addr
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config_get ipaddr "$a" ipaddr
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config_get netmask "$a" netmask
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config_get ip6addr "$a" ip6addr
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[ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
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[ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
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done
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fw_sysctl_interface $ifname
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fw_callback post interface
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uci_set_state firewall core "${iface}_aliases" "$aliases"
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} || {
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local subnets=
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config_get subnets core "${iface}_subnets"
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append subnets "$aliasnet"
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config_set core "${iface}_subnets" "$subnets"
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uci_set_state firewall core "${iface}_subnets" "$subnets"
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}
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local new_zones=
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local new_masq_src=
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local new_masq_dest=
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load_zone() {
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fw_config_get_zone "$1"
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list_contains zone_network "$iface" || return
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fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
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fw__do_rules add ${zone_name} "$ifname" "$aliasnet" "$zone_masq_src" "$zone_masq_dest"
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append new_zones $zone_name
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append new_masq_src "$zone_masq_src"
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append new_masq_dest "$zone_masq_dest"
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[ -n "$aliasnet" ] || ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
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}
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config_foreach load_zone zone
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uci_set_state firewall core "${iface}_zone" "$new_zones"
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uci_set_state firewall core "${iface}_ifname" "$ifname"
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uci_set_state firewall core "${iface}_masq_src" "$new_masq_src"
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uci_set_state firewall core "${iface}_masq_dest" "$new_masq_dest"
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}
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fw_sysctl_interface() {
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local ifname=$1
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{
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sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
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sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
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sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
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sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
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} >/dev/null 2>/dev/null
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}
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