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zapret/init.d/openwrt/functions

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. /lib/functions/network.sh
[ -n "$ZAPRET_BASE" ] || ZAPRET_BASE=/opt/zapret
. "$ZAPRET_BASE/config"
[ -n "$QNUM" ] || QNUM=200
[ -n "$TPPORT" ] || TPPORT=988
[ -n "$WS_USER" ] || WS_USER=daemon
TPWS_LOCALHOST4=127.0.0.127
[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
[ -n "$OPENWRT_LAN" ] || OPENWRT_LAN=lan
# max wait time for the link local ipv6 on the LAN interface
LINKLOCAL_WAIT_SEC=5
IPSET_CR="$ZAPRET_BASE/ipset/create_ipset.sh"
CUSTOM_SCRIPT="$ZAPRET_BASE/init.d/openwrt/custom"
[ -f "$CUSTOM_SCRIPT" ] && . "$CUSTOM_SCRIPT"
IPSET_EXCLUDE="-m set ! --match-set nozapret"
IPSET_EXCLUDE6="-m set ! --match-set nozapret6"
NFQWS_OPT_DESYNC_HTTP="${NFQWS_OPT_DESYNC_HTTP:-$NFQWS_OPT_DESYNC}"
NFQWS_OPT_DESYNC_HTTPS="${NFQWS_OPT_DESYNC_HTTPS:-$NFQWS_OPT_DESYNC}"
NFQWS_OPT_DESYNC_HTTP6="${NFQWS_OPT_DESYNC_HTTP6:-$NFQWS_OPT_DESYNC_HTTP}"
NFQWS_OPT_DESYNC_HTTPS6="${NFQWS_OPT_DESYNC_HTTPS6:-$NFQWS_OPT_DESYNC_HTTPS}"
exists()
{
which "$1" >/dev/null 2>/dev/null
}
existf()
{
type "$1" >/dev/null 2>/dev/null
}
# can be multiple ipv6 outgoing interfaces
# uplink from isp, tunnelbroker, vpn, ...
# want them all. who knows what's the real one that blocks sites
# dont want any manual configuration - want to do it automatically
# standard network_find_wan[6] return only the first
# we use low level function from network.sh to avoid this limitation
# it can change theoretically and stop working
network_find_wan_all()
{
__network_ifstatus "$1" "" "[@.route[@.target='0.0.0.0' && !@.table]].interface" "" 10 2>/dev/null && return
network_find_wan $1
}
network_find_wan6_all()
{
__network_ifstatus "$1" "" "[@.route[@.target='::' && !@.table]].interface" "" 10 2>/dev/null && return
network_find_wan6 $1
}
ipt()
{
iptables -C "$@" >/dev/null 2>/dev/null || iptables -I "$@"
}
ipt_del()
{
iptables -C "$@" >/dev/null 2>/dev/null && iptables -D "$@"
}
ipt6()
{
ip6tables -C "$@" >/dev/null 2>/dev/null || ip6tables -I "$@"
}
ipt6_del()
{
ip6tables -C "$@" >/dev/null 2>/dev/null && ip6tables -D "$@"
}
# there's no route_localnet for ipv6
# the best we can is to route to link local of the incoming interface
# OUTPUT - can DNAT to ::1
# PREROUTING - can't DNAT to ::1. can DNAT to link local of -i interface or to any global addr
# not a good idea to expose tpws to the world (bind to ::)
get_ipv6_linklocal()
{
# $1 - interface name. if empty - any interface
if exists ip ; then
local dev
[ -n "$1" ] && dev="dev $1"
ip addr show $dev | sed -e 's/^.*inet6 \([^ ]*\)\/[0-9]* scope link.*$/\1/;t;d' | head -n 1
else
ifconfig $1 | sed -re 's/^.*inet6 addr: ([^ ]*)\/[0-9]* Scope:Link.*$/\1/;t;d' | head -n 1
fi
}
get_ipv6_global()
{
# $1 - interface name. if empty - any interface
if exists ip ; then
local dev
[ -n "$1" ] && dev="dev $1"
ip addr show $dev | sed -e 's/^.*inet6 \([^ ]*\)\/[0-9]* scope global.*$/\1/;t;d' | head -n 1
else
ifconfig $1 | sed -re 's/^.*inet6 addr: ([^ ]*)\/[0-9]* Scope:Global.*$/\1/;t;d' | head -n 1
fi
}
dnat6_target()
{
# $1 - lan network name
# $2 - var to store target ip6
# get target ip address for DNAT. prefer link locals
# tpws should be as inaccessible from outside as possible
# link local address can appear not immediately after ifup
# DNAT6_TARGET=- means attempt was made but address was not found (to avoid multiple re-attempts)
local DNAT6_TARGET DVAR=DNAT6_TARGET_$1
DVAR=$(echo $DVAR | sed 's/[^a-zA-Z0-9_]/_/g')
eval DNAT6_TARGET="\$$DVAR"
[ -n "$2" ] && eval $2=''
[ -n "$DNAT6_TARGET" ] || {
# no reason to query if its down
network_is_up $1 || return
local DEVICE
network_get_device DEVICE $1
local ct=0
while
DNAT6_TARGET=$(get_ipv6_linklocal $DEVICE)
[ -n "$DNAT6_TARGET" ] && break
[ "$ct" -ge "$LINKLOCAL_WAIT_SEC" ] && break
echo $DEVICE: waiting for the link local for another $(($LINKLOCAL_WAIT_SEC - $ct)) seconds ...
ct=$(($ct+1))
sleep 1
do :; done
[ -n "$DNAT6_TARGET" ] || {
echo $DEVICE: no link local. getting global
DNAT6_TARGET=$(get_ipv6_global $DEVICE)
[ -n "$DNAT6_TARGET" ] || {
echo $DEVICE: could not get any address
DNAT6_TARGET=-
}
}
eval $DVAR="$DNAT6_TARGET"
}
[ -n "$2" ] && eval $2="$DNAT6_TARGET"
}
fw_nfqws_pre4()
{
# $1 - filter ipv4
# $2 - queue number
local DEVICE wan_iface
[ "$DISABLE_IPV4" = "1" ] || {
network_find_wan_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt PREROUTING -t mangle -i $DEVICE -p tcp $1 $IPSET_EXCLUDE src -j NFQUEUE --queue-num $2 --queue-bypass
done
}
}
fw_nfqws_pre6()
{
# $1 - filter ipv6
# $2 - queue number
local DEVICE wan_iface
[ "$DISABLE_IPV6" = "1" ] || {
network_find_wan6_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt6 PREROUTING -t mangle -i $DEVICE -p tcp $1 $IPSET_EXCLUDE6 src -j NFQUEUE --queue-num $2 --queue-bypass
done
}
}
fw_nfqws_pre()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - queue number
fw_nfqws_pre4 "$1" $3
fw_nfqws_pre6 "$2" $3
}
fw_nfqws_post4()
{
# $1 - filter ipv4
# $2 - queue number
local DEVICE wan_iface
[ "$DISABLE_IPV4" = "1" ] || {
network_find_wan_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt POSTROUTING -t mangle -o $DEVICE -p tcp $1 $IPSET_EXCLUDE dst -j NFQUEUE --queue-num $2 --queue-bypass
done
}
}
fw_nfqws_post6()
{
# $1 - filter ipv6
# $2 - queue number
local DEVICE wan_iface
[ "$DISABLE_IPV6" = "1" ] || {
network_find_wan6_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt6 POSTROUTING -t mangle -o $DEVICE -p tcp $1 $IPSET_EXCLUDE6 dst -j NFQUEUE --queue-num $2 --queue-bypass
done
}
}
fw_nfqws_post()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - queue number
fw_nfqws_post4 "$1" $3
fw_nfqws_post6 "$2" $3
}
IPT_OWNER="-m owner ! --uid-owner $WS_USER"
fw_tpws4()
{
# $1 - filter ipv6
# $2 - tpws port
local DEVICE wan_iface
[ "$DISABLE_IPV4" = "1" ] || {
network_find_wan_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt OUTPUT -t nat -o $DEVICE $IPT_OWNER -p tcp $1 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$2
done
# allow localnet route only to special tpws IP
iptables -N input_rule_zapret 2>/dev/null
ipt input_rule_zapret -d 127.0.0.0/8 -j DROP
ipt input_rule_zapret -d $TPWS_LOCALHOST4 -j RETURN
for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
ipt prerouting_rule -t nat -i $DEVICE -p tcp $1 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$2
ipt input_rule -i $DEVICE -j input_rule_zapret
sysctl -qw net.ipv4.conf.$DEVICE.route_localnet=1
done
}
}
fw_tpws6()
{
# $1 - filter ipv6
# $2 - tpws port
local DEVICE wan_iface DNAT6
[ "$DISABLE_IPV6" = "1" ] || {
network_find_wan6_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt6 OUTPUT -t nat -o $DEVICE $IPT_OWNER -p tcp $1 $IPSET_EXCLUDE6 dst -j DNAT --to [::1]:$2
done
for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
dnat6_target $lan DNAT6
[ "$DNAT6" != '-' ] && ipt6 PREROUTING -t nat -i $DEVICE -p tcp $1 $IPSET_EXCLUDE6 dst -j DNAT --to [$DNAT6]:$2
done
}
}
fw_tpws()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - tpws port
fw_tpws4 "$1" $3
fw_tpws6 "$2" $3
}
filter_apply_port_target()
{
# $1 - var name of iptables filter
local f
if [ "$MODE_HTTP" = "1" ] && [ "$MODE_HTTPS" = "1" ]; then
f="-m multiport --dports 80,443"
elif [ "$MODE_HTTPS" = "1" ]; then
f="--dport 443"
elif [ "$MODE_HTTP" = "1" ]; then
f="--dport 80"
else
echo WARNING !!! HTTP and HTTPS are both disabled
fi
eval $1="\"\$$1 $f\""
}
filter_apply_ipset_target4()
{
# $1 - var name of ipv4 iptables filter
if [ "$MODE_FILTER" = "ipset" ]; then
eval $1="\"\$$1 -m set --match-set zapret dst\""
fi
}
filter_apply_ipset_target6()
{
# $1 - var name of ipv4 iptables filter
if [ "$MODE_FILTER" = "ipset" ]; then
eval $1="\"\$$1 -m set --match-set zapret6 dst\""
fi
}
filter_apply_ipset_target()
{
# $1 - var name of ipv4 iptables filter
# $2 - var name of ipv6 iptables filter
filter_apply_ipset_target4 $1
filter_apply_ipset_target6 $2
}
get_nfqws_qnums()
{
# $1 - var name for ipv4 http
# $2 - var name for ipv4 https
# $3 - var name for ipv6 http
# $4 - var name for ipv6 https
local _qn _qns _qn6 _qns6
[ "$DISABLE_IPV4" = "1" ] || {
_qn=$QNUM
_qns=$_qn
[ "$NFQWS_OPT_DESYNC_HTTP" = "$NFQWS_OPT_DESYNC_HTTPS" ] || _qns=$(($QNUM+1))
}
[ "$DISABLE_IPV6" = "1" ] || {
_qn6=$(($QNUM+2))
_qns6=$(($QNUM+3))
[ "$DISABLE_IPV4" = "1" ] || {
if [ "$NFQWS_OPT_DESYNC_HTTP6" = "$NFQWS_OPT_DESYNC_HTTP" ]; then
_qn6=$_qn;
elif [ "$NFQWS_OPT_DESYNC_HTTP6" = "$NFQWS_OPT_DESYNC_HTTPS" ]; then
_qn6=$_qns;
fi
if [ "$NFQWS_OPT_DESYNC_HTTPS6" = "$NFQWS_OPT_DESYNC_HTTP" ]; then
_qns6=$_qn;
elif [ "$NFQWS_OPT_DESYNC_HTTPS6" = "$NFQWS_OPT_DESYNC_HTTPS" ]; then
_qns6=$_qns;
fi
}
[ "$NFQWS_OPT_DESYNC_HTTPS6" = "$NFQWS_OPT_DESYNC_HTTP6" ] && _qns6=$_qn6;
}
if [ "$MODE_HTTP" = 1 ]; then
eval $1=$_qn
eval $3=$_qn6
else
eval $1=
eval $3=
fi
if [ "$MODE_HTTPS" = 1 ]; then
eval $2=$_qns
eval $4=$_qns6
else
eval $2=
eval $4=
fi
}
create_ipset()
{
echo "Creating ipset"
"$IPSET_CR" "$@"
}
is_flow_offload_avail()
{
# $1 = '' for ipv4, '6' for ipv6
grep -q FLOWOFFLOAD /proc/net/ip$1_tables_targets
}
list_nfqws_rules()
{
# $1 = '' for ipv4, '6' for ipv6
ip$1tables -S POSTROUTING -t mangle | \
grep -E "NFQUEUE --queue-num $QNUM --queue-bypass|NFQUEUE --queue-num $(($QNUM+1)) --queue-bypass|NFQUEUE --queue-num $(($QNUM+2)) --queue-bypass|NFQUEUE --queue-num $(($QNUM+3)) --queue-bypass" | \
sed -re 's/^-A POSTROUTING (.*) -j NFQUEUE.*$/\1/' -e "s/-m mark ! --mark $DESYNC_MARK\/$DESYNC_MARK//"
}
reverse_nfqws_rule()
{
sed -e 's/-o /-i /' -e 's/--dport /--sport /' -e 's/--dports /--sports /' -e 's/ dst$/ src/' -e 's/ dst / src /'
}
apply_flow_offloading_enable_rule()
{
# $1 = '' for ipv4, '6' for ipv6
local i off='-j FLOWOFFLOAD'
[ "$FLOWOFFLOAD" = "hardware" ] && off="$off --hw"
i="forwarding_rule_zapret -m comment --comment zapret_traffic_offloading_enable -m conntrack --ctstate RELATED,ESTABLISHED $off"
echo enabling ipv${1:-4} flow offloading : $i
ip$1tables -A $i
}
apply_flow_offloading_exempt_rule()
{
# $1 = '' for ipv4, '6' for ipv6
local i v
v=$1
shift
i="forwarding_rule_zapret $@ -m comment --comment zapret_traffic_offloading_exemption -j RETURN"
echo applying ipv${v:-4} flow offloading exemption : $i
ip${v}tables -A $i
}
flow_offloading_exempt_v()
{
# $1 = '' for ipv4, '6' for ipv6
is_flow_offload_avail $1 || return 0
ipt$1_del forwarding_rule -j forwarding_rule_zapret
ip$1tables -F forwarding_rule_zapret 2>/dev/null
ip$1tables -X forwarding_rule_zapret 2>/dev/null
[ "$FLOWOFFLOAD" = 'software' -o "$FLOWOFFLOAD" = 'hardware' ] && {
ip$1tables -N forwarding_rule_zapret
list_nfqws_rules $1 |
while read rule; do
apply_flow_offloading_exempt_rule "$1" $rule
done
list_nfqws_rules $1 | grep -v "connbytes" | reverse_nfqws_rule |
while read rule; do
apply_flow_offloading_exempt_rule "$1" $rule
done
apply_flow_offloading_enable_rule $1
ipt$1 forwarding_rule -j forwarding_rule_zapret
}
return 0
}
flow_offloading_exempt()
{
[ "$DISABLE_IPV4" = "1" ] || flow_offloading_exempt_v
[ "$DISABLE_IPV6" = "1" ] || flow_offloading_exempt_v 6
}
zapret_apply_firewall()
{
local first_packet_only="-m connbytes --connbytes-dir=original --connbytes-mode=packets --connbytes 1:4"
local desync="-m mark ! --mark $DESYNC_MARK/$DESYNC_MARK"
local f4 f6 qn qns qn6 qns6
# always create ipsets. ip_exclude ipset is required
create_ipset no-update
case "${MODE_OVERRIDE:-$MODE}" in
tpws)
if [ ! "$MODE_HTTP" = "1" ] && [ ! "$MODE_HTTPS" = "1" ]; then
echo both http and https are disabled. not applying redirection.
else
filter_apply_port_target f4
f6=$f4
filter_apply_ipset_target f4 f6
fw_tpws "$f4" "$f6" $TPPORT
fi
;;
nfqws)
# quite complex but we need to minimize nfqws processes to save RAM
get_nfqws_qnums qn qns qn6 qns6
if [ "$MODE_HTTP_KEEPALIVE" != "1" ] && [ -n "$qn" ] && [ "$qn" = "$qns" ]; then
filter_apply_port_target f4
f4="$f4 $first_packet_only"
filter_apply_ipset_target4 f4
fw_nfqws_post4 "$f4 $desync" $qn
else
if [ -n "$qn" ]; then
f4="--dport 80"
[ "$MODE_HTTP_KEEPALIVE" = "1" ] || f4="$f4 $first_packet_only"
filter_apply_ipset_target4 f4
fw_nfqws_post4 "$f4 $desync" $qn
fi
if [ -n "$qns" ]; then
f4="--dport 443 $first_packet_only"
filter_apply_ipset_target4 f4
fw_nfqws_post4 "$f4 $desync" $qns
fi
fi
if [ "$MODE_HTTP_KEEPALIVE" != "1" ] && [ -n "$qn6" ] && [ "$qn6" = "$qns6" ]; then
filter_apply_port_target f6
f6="$f6 $first_packet_only"
filter_apply_ipset_target6 f6
fw_nfqws_post6 "$f6 $desync" $qn6
else
if [ -n "$qn6" ]; then
f6="--dport 80"
[ "$MODE_HTTP_KEEPALIVE" = "1" ] || f6="$f6 $first_packet_only"
filter_apply_ipset_target6 f6
fw_nfqws_post6 "$f6 $desync" $qn6
fi
if [ -n "$qns6" ]; then
f6="--dport 443 $first_packet_only"
filter_apply_ipset_target6 f6
fw_nfqws_post6 "$f6 $desync" $qns6
fi
fi
;;
custom)
existf zapret_custom_firewall && zapret_custom_firewall
;;
esac
flow_offloading_exempt
return 0
}
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