288 lines
6.6 KiB
Bash
288 lines
6.6 KiB
Bash
# Copyright (C) 2009-2010 OpenWrt.org
|
|
# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
|
|
|
|
FW_INITIALIZED=
|
|
|
|
FW_ZONES=
|
|
FW_ZONES4=
|
|
FW_ZONES6=
|
|
FW_CONNTRACK_ZONES=
|
|
FW_NOTRACK_DISABLED=
|
|
|
|
FW_DEFAULTS_APPLIED=
|
|
FW_ADD_CUSTOM_CHAINS=
|
|
FW_ACCEPT_REDIRECTS=
|
|
FW_ACCEPT_SRC_ROUTE=
|
|
|
|
FW_DEFAULT_INPUT_POLICY=REJECT
|
|
FW_DEFAULT_OUTPUT_POLICY=REJECT
|
|
FW_DEFAULT_FORWARD_POLICY=REJECT
|
|
|
|
FW_DISABLE_IPV4=0
|
|
FW_DISABLE_IPV6=0
|
|
|
|
|
|
fw_load_defaults() {
|
|
fw_config_get_section "$1" defaults { \
|
|
string input $FW_DEFAULT_INPUT_POLICY \
|
|
string output $FW_DEFAULT_OUTPUT_POLICY \
|
|
string forward $FW_DEFAULT_FORWARD_POLICY \
|
|
boolean drop_invalid 0 \
|
|
boolean syn_flood 0 \
|
|
boolean synflood_protect 0 \
|
|
string synflood_rate 25 \
|
|
string synflood_burst 50 \
|
|
boolean tcp_syncookies 1 \
|
|
boolean tcp_ecn 0 \
|
|
boolean tcp_westwood 0 \
|
|
boolean tcp_window_scaling 1 \
|
|
boolean accept_redirects 0 \
|
|
boolean accept_source_route 0 \
|
|
boolean custom_chains 1 \
|
|
boolean disable_ipv6 0 \
|
|
} || return
|
|
[ -n "$FW_DEFAULTS_APPLIED" ] && {
|
|
echo "Error: multiple defaults sections detected"
|
|
return 1
|
|
}
|
|
FW_DEFAULTS_APPLIED=1
|
|
|
|
FW_DEFAULT_INPUT_POLICY=$defaults_input
|
|
FW_DEFAULT_OUTPUT_POLICY=$defaults_output
|
|
FW_DEFAULT_FORWARD_POLICY=$defaults_forward
|
|
|
|
FW_ADD_CUSTOM_CHAINS=$defaults_custom_chains
|
|
|
|
FW_ACCEPT_REDIRECTS=$defaults_accept_redirects
|
|
FW_ACCEPT_SRC_ROUTE=$defaults_accept_source_route
|
|
|
|
FW_DISABLE_IPV6=$defaults_disable_ipv6
|
|
|
|
fw_callback pre defaults
|
|
|
|
# Seems like there are only one sysctl for both IP versions.
|
|
for s in syncookies ecn westwood window_scaling; do
|
|
eval "sysctl -e -w net.ipv4.tcp_${s}=\$defaults_tcp_${s}" >/dev/null
|
|
done
|
|
fw_sysctl_interface all
|
|
|
|
[ $defaults_drop_invalid == 1 ] && {
|
|
fw add i f INPUT DROP { -m state --state INVALID }
|
|
fw add i f OUTPUT DROP { -m state --state INVALID }
|
|
fw add i f FORWARD DROP { -m state --state INVALID }
|
|
FW_NOTRACK_DISABLED=1
|
|
}
|
|
|
|
fw add i f INPUT ACCEPT { -m state --state RELATED,ESTABLISHED }
|
|
fw add i f OUTPUT ACCEPT { -m state --state RELATED,ESTABLISHED }
|
|
fw add i f FORWARD ACCEPT { -m state --state RELATED,ESTABLISHED }
|
|
|
|
fw add i f INPUT ACCEPT { -i lo }
|
|
fw add i f OUTPUT ACCEPT { -o lo }
|
|
|
|
# Compatibility to old 'syn_flood' parameter
|
|
[ $defaults_syn_flood == 1 ] && \
|
|
defaults_synflood_protect=1
|
|
|
|
[ $defaults_synflood_protect == 1 ] && {
|
|
echo "Loading synflood protection"
|
|
fw_callback pre synflood
|
|
fw add i f syn_flood
|
|
fw add i f syn_flood RETURN { \
|
|
-p tcp --syn \
|
|
-m limit --limit "${defaults_synflood_rate}/second" --limit-burst "${defaults_synflood_burst}" \
|
|
}
|
|
fw add i f syn_flood DROP
|
|
fw add i f INPUT syn_flood { -p tcp --syn }
|
|
fw_callback post synflood
|
|
}
|
|
|
|
[ $defaults_custom_chains == 1 ] && {
|
|
echo "Adding custom chains"
|
|
fw add i f input_rule
|
|
fw add i f output_rule
|
|
fw add i f forwarding_rule
|
|
fw add i n prerouting_rule
|
|
fw add i n postrouting_rule
|
|
|
|
fw add i f INPUT input_rule
|
|
fw add i f OUTPUT output_rule
|
|
fw add i f FORWARD forwarding_rule
|
|
fw add i n PREROUTING prerouting_rule
|
|
fw add i n POSTROUTING postrouting_rule
|
|
}
|
|
|
|
fw add i f input
|
|
fw add i f output
|
|
fw add i f forward
|
|
|
|
fw add i f INPUT input
|
|
fw add i f OUTPUT output
|
|
fw add i f FORWARD forward
|
|
|
|
fw add i f reject
|
|
fw add i f reject REJECT { --reject-with tcp-reset -p tcp }
|
|
fw add i f reject REJECT { --reject-with port-unreach }
|
|
|
|
fw_set_filter_policy
|
|
|
|
fw_callback post defaults
|
|
}
|
|
|
|
|
|
fw_config_get_zone() {
|
|
[ "${zone_NAME}" != "$1" ] || return
|
|
fw_config_get_section "$1" zone { \
|
|
string name "$1" \
|
|
string network "" \
|
|
string input "$FW_DEFAULT_INPUT_POLICY" \
|
|
string output "$FW_DEFAULT_OUTPUT_POLICY" \
|
|
string forward "$FW_DEFAULT_FORWARD_POLICY" \
|
|
boolean masq 0 \
|
|
boolean conntrack 0 \
|
|
boolean mtu_fix 0 \
|
|
boolean custom_chains "$FW_ADD_CUSTOM_CHAINS" \
|
|
string family "" \
|
|
} || return
|
|
[ -n "$zone_name" ] || zone_name=$zone_NAME
|
|
[ -n "$zone_network" ] || zone_network=$zone_name
|
|
}
|
|
|
|
fw_load_zone() {
|
|
fw_config_get_zone "$1"
|
|
|
|
list_contains FW_ZONES $zone_name && {
|
|
fw_die "zone ${zone_name}: duplicated zone"
|
|
}
|
|
append FW_ZONES $zone_name
|
|
|
|
fw_callback pre zone
|
|
|
|
[ $zone_conntrack = 1 -o $zone_masq = 1 ] && \
|
|
append FW_CONNTRACK_ZONES "$zone_NAME"
|
|
|
|
local mode
|
|
case "$zone_family" in
|
|
*4)
|
|
mode=4
|
|
append FW_ZONES4 $zone_name
|
|
uci_set_state firewall core ${zone_name}_ipv4 1
|
|
;;
|
|
*6)
|
|
mode=6
|
|
append FW_ZONES6 $zone_name
|
|
uci_set_state firewall core ${zone_name}_ipv6 1
|
|
;;
|
|
*)
|
|
mode=i
|
|
append FW_ZONES4 $zone_name
|
|
append FW_ZONES6 $zone_name
|
|
uci_set_state firewall core ${zone_name}_ipv4 1
|
|
uci_set_state firewall core ${zone_name}_ipv6 1
|
|
;;
|
|
esac
|
|
|
|
local chain=zone_${zone_name}
|
|
|
|
fw add $mode f ${chain}_ACCEPT
|
|
fw add $mode f ${chain}_DROP
|
|
fw add $mode f ${chain}_REJECT
|
|
fw add $mode f ${chain}_MSSFIX
|
|
|
|
# TODO: Rename to ${chain}_input
|
|
fw add $mode f ${chain}
|
|
fw add $mode f ${chain} ${chain}_${zone_input} $
|
|
|
|
fw add $mode f ${chain}_forward
|
|
fw add $mode f ${chain}_forward ${chain}_${zone_forward} $
|
|
|
|
# TODO: add ${chain}_output
|
|
fw add $mode f output ${chain}_${zone_output} $
|
|
|
|
# TODO: Rename to ${chain}_MASQUERADE
|
|
fw add $mode n ${chain}_nat
|
|
fw add $mode n ${chain}_prerouting
|
|
|
|
fw add $mode r ${chain}_notrack
|
|
[ $zone_masq == 1 ] && \
|
|
fw add $mode n POSTROUTING ${chain}_nat $
|
|
|
|
[ $zone_mtu_fix == 1 ] && \
|
|
fw add $mode f FORWARD ${chain}_MSSFIX ^
|
|
|
|
[ $zone_custom_chains == 1 ] && {
|
|
[ $FW_ADD_CUSTOM_CHAINS == 1 ] || \
|
|
fw_die "zone ${zone_name}: custom_chains globally disabled"
|
|
|
|
fw add $mode f input_${zone_name}
|
|
fw add $mode f ${chain} input_${zone_name} ^
|
|
|
|
fw add $mode f forwarding_${zone_name}
|
|
fw add $mode f ${chain}_forward forwarding_${zone_name} ^
|
|
|
|
fw add $mode n prerouting_${zone_name}
|
|
fw add $mode n ${chain}_prerouting prerouting_${zone_name} ^
|
|
}
|
|
|
|
fw_callback post zone
|
|
}
|
|
|
|
fw_load_notrack_zone() {
|
|
list_contains FW_CONNTRACK_ZONES "$1" && return
|
|
|
|
fw_config_get_zone "$1"
|
|
|
|
fw_callback pre notrack
|
|
|
|
fw add i f zone_${zone_name}_notrack NOTRACK $
|
|
|
|
fw_callback post notrack
|
|
}
|
|
|
|
|
|
fw_load_include() {
|
|
local name="$1"
|
|
|
|
local path; config_get path ${name} path
|
|
[ -e $path ] && . $path
|
|
}
|
|
|
|
|
|
fw_clear() {
|
|
local policy=$1
|
|
|
|
fw_set_filter_policy $policy
|
|
|
|
local tab
|
|
for tab in f n r; do
|
|
fw del i $tab
|
|
done
|
|
}
|
|
|
|
fw_set_filter_policy() {
|
|
local policy=$1
|
|
|
|
local chn tgt
|
|
for chn in INPUT OUTPUT FORWARD; do
|
|
eval "tgt=\${policy:-\${FW_DEFAULT_${chn}_POLICY}}"
|
|
[ $tgt == "REJECT" ] && tgt=reject
|
|
[ $tgt == "ACCEPT" -o $tgt == "DROP" ] || {
|
|
fw add i f $chn $tgt $
|
|
tgt=DROP
|
|
}
|
|
fw policy i f $chn $tgt
|
|
done
|
|
}
|
|
|
|
|
|
fw_callback() {
|
|
local pp=$1
|
|
local hk=$2
|
|
|
|
local libs lib
|
|
eval "libs=\$FW_CB_${pp}_${hk}"
|
|
[ -n "$libs" ] || return
|
|
for lib in $libs; do
|
|
${lib}_${pp}_${hk}_cb
|
|
done
|
|
}
|