zapret/init.d/openwrt/functions

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. /lib/functions/network.sh
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[ -n "$ZAPRET_BASE" ] || ZAPRET_BASE=/opt/zapret
. "$ZAPRET_BASE/config"
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. "$ZAPRET_BASE/common/base.sh"
. "$ZAPRET_BASE/common/fwtype.sh"
. "$ZAPRET_BASE/common/queue.sh"
. "$ZAPRET_BASE/common/linux_iphelper.sh"
. "$ZAPRET_BASE/common/ipt.sh"
. "$ZAPRET_BASE/common/nft.sh"
. "$ZAPRET_BASE/common/linux_fw.sh"
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[ -n "$QNUM" ] || QNUM=200
[ -n "$TPPORT" ] || TPPORT=988
[ -n "$WS_USER" ] || WS_USER=daemon
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[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
[ -n "$OPENWRT_LAN" ] || OPENWRT_LAN=lan
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TPWS_LOCALHOST4=127.0.0.127
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# 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"
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[ -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}"
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# 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()
{
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__network_ifstatus "$1" "" "[@.route[@.target='0.0.0.0' && !@.table]].interface" "" 10 2>/dev/null && return
network_find_wan $1
}
network_find_wan6_all()
{
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__network_ifstatus "$1" "" "[@.route[@.target='::' && !@.table]].interface" "" 10 2>/dev/null && return
network_find_wan6 $1
}
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route_localnet()
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{
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for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
sysctl -qw net.ipv4.conf.$DEVICE.route_localnet=1
done
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}
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dnat6_target()
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{
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# $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"
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}
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set_route_localnet()
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{
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# $1 - 1 = enable, 0 = disable
[ "$DISABLE_IPV4" = "1" ] || {
local lan DEVICE
for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
sysctl -q -w net.ipv4.conf.$DEVICE.route_localnet=$1
done
}
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}
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prepare_route_localnet()
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{
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set_route_localnet 1
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}
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unprepare_route_localnet()
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{
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set_route_localnet 0
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}
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prepare_tpws_fw4()
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{
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# otherwise linux kernel will treat 127.0.0.0/8 as "martian" ip and refuse routing to it
# NOTE : kernels <3.6 do not have this feature. consider upgrading or change DNAT to REDIRECT and do not bind to 127.0.0.0/8
[ "$DISABLE_IPV4" = "1" ] || {
iptables -N input_rule_zapret 2>/dev/null
ipt input_rule_zapret -d $TPWS_LOCALHOST4 -j RETURN
ipta input_rule_zapret -d 127.0.0.0/8 -j DROP
ipt INPUT ! -i lo -j input_rule_zapret
prepare_route_localnet
}
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}
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unprepare_tpws_fw4()
{
[ "$DISABLE_IPV4" = "1" ] || {
unprepare_route_localnet
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ipt_del INPUT ! -i lo -j input_rule_zapret
iptables -F input_rule_zapret 2>/dev/null
iptables -X input_rule_zapret 2>/dev/null
}
}
unprepare_tpws_fw()
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{
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unprepare_tpws_fw4
}
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fw_nfqws_pre4()
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{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv4
# $3 - queue number
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local DEVICE wan_iface
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[ "$DISABLE_IPV4" = "1" ] || {
network_find_wan_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt_add_del $1 PREROUTING -t mangle -i $DEVICE -p tcp $2 $IPSET_EXCLUDE src -j NFQUEUE --queue-num $3 --queue-bypass
done
}
}
fw_nfqws_pre6()
{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv6
# $3 - queue number
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local DEVICE wan_iface
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[ "$DISABLE_IPV6" = "1" ] || {
network_find_wan6_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt6_add_del $1 PREROUTING -t mangle -i $DEVICE -p tcp $2 $IPSET_EXCLUDE6 src -j NFQUEUE --queue-num $3 --queue-bypass
done
}
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}
fw_nfqws_pre()
{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv4
# $3 - filter ipv6
# $4 - queue number
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fw_nfqws_pre4 $1 "$2" $4
fw_nfqws_pre6 $1 "$3" $4
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}
fw_nfqws_post4()
{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv4
# $3 - queue number
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local DEVICE wan_iface
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[ "$DISABLE_IPV4" = "1" ] || {
network_find_wan_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt_add_del $1 POSTROUTING -t mangle -o $DEVICE -p tcp $2 $IPSET_EXCLUDE dst -j NFQUEUE --queue-num $3 --queue-bypass
done
}
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}
fw_nfqws_post6()
{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv6
# $3 - queue number
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local DEVICE wan_iface
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[ "$DISABLE_IPV6" = "1" ] || {
network_find_wan6_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt6_add_del $1 POSTROUTING -t mangle -o $DEVICE -p tcp $2 $IPSET_EXCLUDE6 dst -j NFQUEUE --queue-num $3 --queue-bypass
done
}
}
fw_nfqws_post()
{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv4
# $3 - filter ipv6
# $4 - queue number
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fw_nfqws_post4 $1 "$2" $4
fw_nfqws_post6 $1 "$3" $4
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}
IPT_OWNER="-m owner ! --uid-owner $WS_USER"
fw_tpws4()
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{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv4
# $3 - tpws port
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local lan DEVICE ext_iface wan_iface
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[ "$DISABLE_IPV4" = "1" ] || {
network_find_wan_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt_add_del $1 OUTPUT -t nat -o $DEVICE $IPT_OWNER -p tcp $2 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$3
done
[ "$1" = 1 ] && prepare_tpws_fw4
for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
ipt_add_del $1 PREROUTING -t nat -i $DEVICE -p tcp $2 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$3
done
}
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}
fw_tpws6()
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{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv6
# $3 - tpws port
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local lan DEVICE ext_iface wan_iface DNAT6
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[ "$DISABLE_IPV6" = "1" ] || {
network_find_wan6_all wan_iface
for ext_iface in $wan_iface; do
network_get_device DEVICE $ext_iface
ipt6_add_del $1 OUTPUT -t nat -o $DEVICE $IPT_OWNER -p tcp $2 $IPSET_EXCLUDE6 dst -j DNAT --to [::1]:$3
done
for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
dnat6_target $lan DNAT6
[ "$DNAT6" != '-' ] && ipt6_add_del $1 PREROUTING -t nat -i $DEVICE -p tcp $2 $IPSET_EXCLUDE6 dst -j DNAT --to [$DNAT6]:$3
done
}
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}
fw_tpws()
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{
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# $1 - 1 - add, 0 - del
# $2 - filter ipv4
# $3 - filter ipv6
# $4 - tpws port
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fw_tpws4 $1 "$2" $4
fw_tpws6 $1 "$3" $4
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}
create_ipset()
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{
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echo "Creating ip list table (firewall type $FWTYPE)"
"$IPSET_CR" "$@"
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}
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()
{
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sed -e 's/-o /-i /g' -e 's/--dport /--sport /g' -e 's/--dports /--sports /g' -e 's/ dst$/ src/' -e 's/ dst / src /g'
}
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
}
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flow_offloading_unexempt_v()
{
ipt$1_del FORWARD -j forwarding_rule_zapret
ip$1tables -F forwarding_rule_zapret 2>/dev/null
ip$1tables -X forwarding_rule_zapret 2>/dev/null
}
flow_offloading_exempt_v()
{
# $1 = '' for ipv4, '6' for ipv6
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is_ipt_flow_offload_avail $1 || return 0
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flow_offloading_unexempt_v $1
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[ "$FLOWOFFLOAD" = 'software' -o "$FLOWOFFLOAD" = 'hardware' ] && {
ip$1tables -N forwarding_rule_zapret
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list_nfqws_rules $1 |
while read rule; do
apply_flow_offloading_exempt_rule "$1" $rule
done
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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
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ipt$1 FORWARD -j forwarding_rule_zapret
}
return 0
}
flow_offloading_exempt()
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{
[ "$DISABLE_IPV4" = "1" ] || flow_offloading_exempt_v
[ "$DISABLE_IPV6" = "1" ] || flow_offloading_exempt_v 6
}
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flow_offloading_unexempt()
{
[ "$DISABLE_IPV4" = "1" ] || flow_offloading_unexempt_v
[ "$DISABLE_IPV6" = "1" ] || flow_offloading_unexempt_v 6
}
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nft_fill_ifsets_overload()
{
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local script ifaces DLAN DWAN DWAN6
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call_for_multiple_items network_get_device DLAN "$OPENWRT_LAN"
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network_find_wan_all ifaces
call_for_multiple_items network_get_device DWAN "$ifaces"
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network_find_wan6_all ifaces
call_for_multiple_items network_get_device DWAN6 "$ifaces"
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nft_fill_ifsets "$DLAN" "$DWAN" "$DWAN6"
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}
nft_fw_tpws4()
{
# $1 - filter ipv4
# $2 - tpws port
[ "$DISABLE_IPV4" = "1" ] || {
nft_add_rule dnat_output skuid != $WS_USER oifname @wanif meta l4proto tcp $1 ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$2
nft_add_rule dnat_pre iifname @lanif meta l4proto tcp $1 ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$2
prepare_route_localnet
}
}
nft_fw_tpws6()
{
# $1 - filter ipv6
# $2 - tpws port
local lan DEVICE DNAT6
[ "$DISABLE_IPV6" = "1" ] || {
nft_add_rule dnat_output skuid != $WS_USER oifname @wanif6 meta l4proto tcp $1 ip6 daddr != @nozapret6 dnat ip6 to [::1]:$2
for lan in $OPENWRT_LAN; do
network_get_device DEVICE $lan
[ -n "$DEVICE" ] || continue
dnat6_target $lan DNAT6
[ "$DNAT6" != '-' ] && nft_add_rule dnat_pre iifname $DEVICE meta l4proto tcp $1 ip6 daddr != @nozapret6 dnat ip6 to [$DNAT6]:$2
done
}
}
nft_fw_tpws()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - tpws port
nft_fw_tpws4 "$1" $3
nft_fw_tpws6 "$2" $3
}
nft_fw_nfqws_post4()
{
# $1 - filter ipv4
# $2 - queue number
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local rule
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[ "$DISABLE_IPV4" = "1" ] || {
rule="oifname @wanif meta l4proto tcp $1 ip daddr != @nozapret"
nft_add_rule postrouting $rule queue num $2 bypass
nft_add_nfqws_flow_exempt_rule "$rule"
}
}
nft_fw_nfqws_post6()
{
# $1 - filter ipv6
# $2 - queue number
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local rule
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[ "$DISABLE_IPV6" = "1" ] || {
rule="oifname @wanif6 meta l4proto tcp $1 ip6 daddr != @nozapret6"
nft_add_rule postrouting $rule queue num $2 bypass
nft_add_nfqws_flow_exempt_rule "$rule"
}
}
nft_fw_nfqws_post()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - queue number
nft_fw_nfqws_post4 "$1" $3
nft_fw_nfqws_post6 "$2" $3
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}