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Diffstat (limited to 'package/firewall/files/lib/core_interface.sh')
| -rw-r--r-- | package/firewall/files/lib/core_interface.sh | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/package/firewall/files/lib/core_interface.sh b/package/firewall/files/lib/core_interface.sh new file mode 100644 index 000000000..3d6718431 --- /dev/null +++ b/package/firewall/files/lib/core_interface.sh @@ -0,0 +1,205 @@ +# Copyright (C) 2009-2012 OpenWrt.org + +fw__uci_state_add() { + local var="$1" + local item="$2" + + local val="$(uci_get_state firewall core $var)" + local e1; for e1 in $item; do + local e2; for e2 in $val; do + [ "$e1" = "$e2" ] && e1="" + done + val="${val:+$val${e1:+ }}$e1" + done + + uci_toggle_state firewall core $var "$val" +} + +fw__uci_state_del() { + local var="$1" + local item="$2" + + local rest="" + local val="$(uci_get_state firewall core $var)" + local e1; for e1 in $val; do + local e2; for e2 in $item; do + [ "$e1" = "$e2" ] && e1="" + done + rest="${rest:+$rest${e1:+ }}$e1" + done + + uci_toggle_state firewall core $var "$rest" +} + +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" $inet } + + [ "$(uci_get_state firewall core "${zone}_tcpmss")" == 1 ] && \ + fw $action $mode m ${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 $ifname + fw_callback post interface + + uci_toggle_state firewall core "${iface}_aliases" "$aliases" + } || { + local subnets= + config_get subnets core "${iface}_subnets" + append subnets "$aliasnet" + + config_set core "${iface}_subnets" "$subnets" + uci_toggle_state firewall core "${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="$ifname" /sbin/hotplug-call firewall + } + } + config_foreach load_zone zone + + uci_toggle_state firewall core "${iface}_zone" "$new_zones" + uci_toggle_state firewall core "${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 +} + |