[ -n "$ZAPRET_NFT_TABLE" ] || ZAPRET_NFT_TABLE=zapret # required for : nft -f - create_dev_stdin nft_create_table() { nft add table inet $ZAPRET_NFT_TABLE } nft_del_table() { nft delete table inet $ZAPRET_NFT_TABLE 2>/dev/null } nft_list_table() { nft -t list table inet $ZAPRET_NFT_TABLE } nft_create_set() { # $1 - set name # $2 - params nft create set inet $ZAPRET_NFT_TABLE $1 "{ $2 }" 2>/dev/null } nft_del_set() { # $1 - set name nft delete set inet $ZAPRET_NFT_TABLE $1 } nft_flush_set() { # $1 - set name nft flush set inet $ZAPRET_NFT_TABLE $1 } nft_set_exists() { # $1 - set name nft -t list set inet $ZAPRET_NFT_TABLE $1 2>/dev/null >/dev/null } nft_del_all_chains_from_table() { # $1 - table_name with or without family # delete all chains with possible references to each other # cannot just delete all in the list because of references # avoid infinite loops local chains deleted=1 error=1 while [ -n "$deleted" -a -n "$error" ]; do chains=$(nft -t list table $1 2>/dev/null | sed -nre "s/^[ ]*chain ([^ ]+) \{/\1/p" | xargs) [ -n "$chains" ] || break deleted= error= for chain in $chains; do if nft delete chain $1 $chain 2>/dev/null; then deleted=1 else error=1 fi done done } nft_create_chains() { # NOTE : postrouting hook has priority 101 to hook packets already processed by nat # NOTE : this is the only way to implement ipfrag for forwarded packets if nat is present # NOTE : to avoid retracking and sport changing use notrack for nfqws generated packets # NOTE : this also prevents defragmentation of ipv6 fragmented frames in kernels 4.16+ cat << EOF | nft -f - add chain inet $ZAPRET_NFT_TABLE dnat_output { type nat hook output priority -101; } flush chain inet $ZAPRET_NFT_TABLE dnat_output add chain inet $ZAPRET_NFT_TABLE dnat_pre { type nat hook prerouting priority -101; } flush chain inet $ZAPRET_NFT_TABLE dnat_pre add chain inet $ZAPRET_NFT_TABLE forward { type filter hook forward priority -1; } flush chain inet $ZAPRET_NFT_TABLE forward add chain inet $ZAPRET_NFT_TABLE input { type filter hook input priority -1; } flush chain inet $ZAPRET_NFT_TABLE input add chain inet $ZAPRET_NFT_TABLE flow_offload flush chain inet $ZAPRET_NFT_TABLE flow_offload add chain inet $ZAPRET_NFT_TABLE localnet_protect flush chain inet $ZAPRET_NFT_TABLE localnet_protect add rule inet $ZAPRET_NFT_TABLE localnet_protect ip daddr $TPWS_LOCALHOST4 return comment "route_localnet allow access to tpws" add rule inet $ZAPRET_NFT_TABLE localnet_protect ip daddr 127.0.0.0/8 drop comment "route_localnet remote access protection" add rule inet $ZAPRET_NFT_TABLE input iif != lo jump localnet_protect add chain inet $ZAPRET_NFT_TABLE postrouting { type filter hook postrouting priority 99; } flush chain inet $ZAPRET_NFT_TABLE postrouting add set inet $ZAPRET_NFT_TABLE lanif { type ifname; } add set inet $ZAPRET_NFT_TABLE wanif { type ifname; } add set inet $ZAPRET_NFT_TABLE wanif6 { type ifname; } add map inet $ZAPRET_NFT_TABLE link_local { type ifname : ipv6_addr; } EOF # unfortunately this approach breaks udp desync of the connection initiating packet (new, first one) # however without notrack ipfrag will not work # postrouting priority : 99 - before srcnat, 101 - after srcnat # add chain inet $ZAPRET_NFT_TABLE predefrag { type filter hook output priority -401; } # flush chain inet $ZAPRET_NFT_TABLE predefrag # add rule inet $ZAPRET_NFT_TABLE predefrag mark and $DESYNC_MARK !=0 notrack comment "do not track nfqws generated packets to avoid nat tampering and defragmentation" } nft_del_chains() { # do not delete all chains because of additional user hooks # they must be inside zapret table to use nfsets cat << EOF | nft -f - 2>/dev/null delete chain inet $ZAPRET_NFT_TABLE dnat_output delete chain inet $ZAPRET_NFT_TABLE dnat_pre delete chain inet $ZAPRET_NFT_TABLE forward delete chain inet $ZAPRET_NFT_TABLE input delete chain inet $ZAPRET_NFT_TABLE postrouting delete chain inet $ZAPRET_NFT_TABLE flow_offload delete chain inet $ZAPRET_NFT_TABLE localnet_protect EOF # unfortunately this approach breaks udp desync of the connection initiating packet (new, first one) # delete chain inet $ZAPRET_NFT_TABLE predefrag } nft_del_flowtable() { nft delete flowtable inet $ZAPRET_NFT_TABLE ft 2>/dev/null } nft_create_or_update_flowtable() { # $1 = flags ('offload' for hw offload) # $2,$3,$4,... - interfaces # can be called multiple times to add interfaces. interfaces can only be added , not removed local flags=$1 devices makelist shift # warning ! nft versions at least up to 1.0.1 do not allow interface names starting with digit in flowtable and do not allow quoting # warning ! openwrt fixes this in post-21.x snapshots with special nft patch # warning ! in traditional linux distros nft is unpatched and will fail with quoted interface definitions if unfixed [ -n "$flags" ] && flags="flags $flags;" for makelist in make_quoted_comma_list make_comma_list; do $makelist devices "$@" [ -n "$devices" ] && devices="devices={$devices};" nft add flowtable inet $ZAPRET_NFT_TABLE ft "{ hook ingress priority -1; $flags $devices }" && break done } nft_flush_ifsets() { cat << EOF | nft -f - 2>/dev/null flush set inet $ZAPRET_NFT_TABLE lanif flush set inet $ZAPRET_NFT_TABLE wanif flush set inet $ZAPRET_NFT_TABLE wanif6 flush map inet $ZAPRET_NFT_TABLE link_local EOF } nft_flush_link_local() { nft flush map inet $ZAPRET_NFT_TABLE link_local 2>/dev/null } nft_list_ifsets() { nft list set inet $ZAPRET_NFT_TABLE lanif nft list set inet $ZAPRET_NFT_TABLE wanif nft list set inet $ZAPRET_NFT_TABLE wanif6 nft list map inet $ZAPRET_NFT_TABLE link_local nft list flowtable inet $ZAPRET_NFT_TABLE ft 2>/dev/null } nft_create_firewall() { nft_create_table nft_del_flowtable nft_flush_link_local nft_create_chains } nft_del_firewall() { nft_del_chains nft_del_flowtable nft_flush_link_local # leave ifsets and ipsets because they may be used by custom rules } nft_add_rule() { # $1 - chain # $2,$3,... - rule(s) local chain="$1" shift nft add rule inet $ZAPRET_NFT_TABLE $chain "$@" } nft_add_set_element() { # $1 - set or map name # $2 - element [ -z "$2" ] || nft add element inet $ZAPRET_NFT_TABLE $1 "{ $2 }" } nft_add_set_elements() { # $1 - set or map name # $2,$3,... - element(s) local set="$1" elements shift make_comma_list elements "$@" nft_add_set_element $set "$elements" } nft_reverse_nfqws_rule() { echo "$@" | sed -e 's/oifname /iifname /g' -e 's/dport /sport /g' -e 's/daddr /saddr /g' -e 's/ct original /ct reply /g' -e "s/mark and $DESYNC_MARK == 0//g" } nft_clean_nfqws_rule() { echo "$@" | sed -e "s/mark and $DESYNC_MARK == 0//g" } nft_add_nfqws_flow_exempt_rule() { # $1 - rule (must be all filters in one var) nft_add_rule flow_offload $(nft_clean_nfqws_rule $1) return comment \"direct flow offloading exemption\" # do not need this because of oifname @wanif/@wanif6 filter in forward chain #nft_add_rule flow_offload $(nft_reverse_nfqws_rule $1) return comment \"reverse flow offloading exemption\" } nft_add_flow_offload_exemption() { # "$1" - rule for ipv4 # "$2" - rule for ipv6 # "$3" - comment [ "$DISABLE_IPV4" = "1" -o -z "$1" ] || nft_add_rule flow_offload oifname @wanif $1 ip daddr != @nozapret return comment \"$3\" [ "$DISABLE_IPV6" = "1" -o -z "$2" ] || nft_add_rule flow_offload oifname @wanif6 $2 ip6 daddr != @nozapret6 return comment \"$3\" } nft_hw_offload_supported() { # $1,$2,... - interface names local devices res=1 make_quoted_comma_list devices "$@" [ -n "$devices" ] && devices="devices={$devices};" nft add table ${ZAPRET_NFT_TABLE}_test && nft add flowtable ${ZAPRET_NFT_TABLE}_test ft "{ flags offload; $devices }" 2>/dev/null && res=0 nft delete table ${ZAPRET_NFT_TABLE}_test 2>/dev/null return $res } nft_apply_flow_offloading() { # ft can be absent nft_add_rule flow_offload meta l4proto "{ tcp, udp }" flow add @ft 2>/dev/null && { # allow only outgoing packets to initiate flow offload nft_add_rule forward oifname @wanif jump flow_offload nft_add_rule forward oifname @wanif6 jump flow_offload } } nft_filter_apply_port_target() { # $1 - var name of nftables filter local f if [ "$MODE_HTTP" = "1" ] && [ "$MODE_HTTPS" = "1" ]; then f="tcp dport {80,443}" elif [ "$MODE_HTTPS" = "1" ]; then f="tcp dport 443" elif [ "$MODE_HTTP" = "1" ]; then f="tcp dport 80" else echo WARNING !!! HTTP and HTTPS are both disabled fi eval $1="\"\$$1 $f\"" } nft_filter_apply_ipset_target4() { # $1 - var name of ipv4 nftables filter if [ "$MODE_FILTER" = "ipset" ]; then eval $1="\"\$$1 ip daddr @zapret\"" fi } nft_filter_apply_ipset_target6() { # $1 - var name of ipv6 nftables filter if [ "$MODE_FILTER" = "ipset" ]; then eval $1="\"\$$1 ip6 daddr @zapret6\"" fi } nft_filter_apply_ipset_target() { # $1 - var name of ipv4 nftables filter # $2 - var name of ipv6 nftables filter nft_filter_apply_ipset_target4 $1 nft_filter_apply_ipset_target6 $2 } nft_script_add_ifset_element() { # $1 - set name # $2 - space separated elements local elements [ -n "$2" ] && { make_quoted_comma_list elements $2 script="${script} add element inet $ZAPRET_NFT_TABLE $1 { $elements }" } } nft_fill_ifsets() { # $1 - space separated lan interface names # $2 - space separated wan interface names # $3 - space separated wan6 interface names local script i j ALLDEVS devs # if large sets exist nft works very ineffectively # looks like it analyzes the whole table blob to find required data pieces # calling all in one shot helps not to waste cpu time many times script="flush set inet $ZAPRET_NFT_TABLE wanif flush set inet $ZAPRET_NFT_TABLE wanif6 flush set inet $ZAPRET_NFT_TABLE lanif" [ "$DISABLE_IPV4" = "1" ] || nft_script_add_ifset_element wanif "$2" [ "$DISABLE_IPV6" = "1" ] || nft_script_add_ifset_element wanif6 "$3" nft_script_add_ifset_element lanif "$1" echo "$script" | nft -f - case "$FLOWOFFLOAD" in software) ALLDEVS=$(unique $1 $2 $3) # unbound flowtable may cause error in older nft version nft_create_or_update_flowtable '' $ALLDEVS 2>/dev/null ;; hardware) ALLDEVS=$(unique $1 $2 $3) # first create unbound flowtable. may cause error in older nft version nft_create_or_update_flowtable 'offload' 2>/dev/null # then add elements. some of them can cause error because unsupported for i in $ALLDEVS; do if nft_hw_offload_supported $i; then nft_create_or_update_flowtable 'offload' $i else # bridge members must be added instead of the bridge itself devs=$(resolve_lower_devices $i) [ -n "$devs" ] && nft_hw_offload_supported $devs && { for j in $devs; do nft_create_or_update_flowtable 'offload' $j done } fi done ;; esac } nft_only() { linux_fwtype case "$FWTYPE" in nftables) "$@" ;; esac } nft_print_op() { echo "Adding nftables ipv$3 rule for $2 : $1" } _nft_fw_tpws4() { # $1 - filter ipv4 # $2 - tpws port # $3 - not-empty if wan interface filtering required [ "$DISABLE_IPV4" = "1" -o -z "$1" ] || { local filter="$1" port="$2" nft_print_op "$filter" "tpws (port $2)" 4 nft_add_rule dnat_output skuid != $WS_USER ${3:+oifname @wanif }$filter ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$port nft_add_rule dnat_pre iifname @lanif $filter ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$port prepare_route_localnet } } _nft_fw_tpws6() { # $1 - filter ipv6 # $2 - tpws port # $3 - lan interface names space separated # $4 - not-empty if wan interface filtering required [ "$DISABLE_IPV6" = "1" -o -z "$1" ] || { local filter="$1" port="$2" DNAT6 i nft_print_op "$filter" "tpws (port $port)" 6 nft_add_rule dnat_output skuid != $WS_USER ${4:+oifname @wanif6 }$filter ip6 daddr != @nozapret6 dnat ip6 to [::1]:$port [ -n "$3" ] && { nft_add_rule dnat_pre $filter ip6 daddr != @nozapret6 dnat ip6 to iifname map @link_local:$port for i in $3; do _dnat6_target $i DNAT6 # can be multiple tpws processes on different ports [ -n "$DNAT6" -a "$DNAT6" != '-' ] && nft_add_set_element link_local "$i : $DNAT6" 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 # $3 - not-empty if wan interface filtering required [ "$DISABLE_IPV4" = "1" -o -z "$1" ] || { local filter="$1" port="$2" rule nft_print_op "$filter" "nfqws postrouting (qnum $port)" 4 rule="${3:+oifname @wanif }$filter ip daddr != @nozapret" nft_add_rule postrouting $rule queue num $port bypass nft_add_nfqws_flow_exempt_rule "$rule" } } _nft_fw_nfqws_post6() { # $1 - filter ipv6 # $2 - queue number # $3 - not-empty if wan interface filtering required [ "$DISABLE_IPV6" = "1" -o -z "$1" ] || { local filter="$1" port="$2" rule nft_print_op "$filter" "nfqws postrouting (qnum $port)" 6 rule="${3:+oifname @wanif6 }$filter ip6 daddr != @nozapret6" nft_add_rule postrouting $rule queue num $port bypass nft_add_nfqws_flow_exempt_rule "$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" $3 } zapret_reload_ifsets() { nft_only nft_create_table ; nft_fill_ifsets_overload return 0 } zapret_list_ifsets() { nft_only nft_list_ifsets return 0 } zapret_list_table() { nft_only nft_list_table return 0 } zapret_apply_firewall_rules_nft() { local mode="${MODE_OVERRIDE:-$MODE}" local first_packet_only="ct original packets 1-4" local desync="mark and $DESYNC_MARK == 0" local f4 f6 qn qns qn6 qns6 case "$mode" in tpws) if [ ! "$MODE_HTTP" = "1" ] && [ ! "$MODE_HTTPS" = "1" ]; then echo both http and https are disabled. not applying redirection. else nft_filter_apply_port_target f4 f6=$f4 nft_filter_apply_ipset_target f4 f6 nft_fw_tpws "$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" = "$qns" ]; then nft_filter_apply_port_target f4 f4="$f4 $first_packet_only" nft_filter_apply_ipset_target4 f4 nft_fw_nfqws_post4 "$f4 $desync" $qn else if [ -n "$qn" ]; then f4="tcp dport 80" [ "$MODE_HTTP_KEEPALIVE" = "1" ] || f4="$f4 $first_packet_only" nft_filter_apply_ipset_target4 f4 nft_fw_nfqws_post4 "$f4 $desync" $qn fi if [ -n "$qns" ]; then f4="tcp dport 443 $first_packet_only" nft_filter_apply_ipset_target4 f4 nft_fw_nfqws_post4 "$f4 $desync" $qns fi fi if [ "$MODE_HTTP_KEEPALIVE" != "1" ] && [ -n "$qn6" ] && [ "$qn6" = "$qns6" ]; then nft_filter_apply_port_target f6 f6="$f6 $first_packet_only" nft_filter_apply_ipset_target6 f6 nft_fw_nfqws_post6 "$f6 $desync" $qn6 else if [ -n "$qn6" ]; then f6="tcp dport 80" [ "$MODE_HTTP_KEEPALIVE" = "1" ] || f6="$f6 $first_packet_only" nft_filter_apply_ipset_target6 f6 nft_fw_nfqws_post6 "$f6 $desync" $qn6 fi if [ -n "$qns6" ]; then f6="tcp dport 443 $first_packet_only" nft_filter_apply_ipset_target6 f6 nft_fw_nfqws_post6 "$f6 $desync" $qns6 fi fi ;; custom) existf zapret_custom_firewall_nft && zapret_custom_firewall_nft ;; esac } zapret_apply_firewall_nft() { echo Applying nftables local mode="${MODE_OVERRIDE:-$MODE}" [ "$mode" = "tpws-socks" ] && return 0 create_ipset no-update nft_create_firewall nft_fill_ifsets_overload zapret_apply_firewall_rules_nft [ "$FLOWOFFLOAD" = 'software' -o "$FLOWOFFLOAD" = 'hardware' ] && nft_apply_flow_offloading return 0 } zapret_unapply_firewall_nft() { echo Clearing nftables unprepare_route_localnet nft_del_firewall return 0 } zapret_do_firewall_nft() { # $1 - 1 - add, 0 - del if [ "$1" = 0 ] ; then zapret_unapply_firewall_nft else zapret_apply_firewall_nft fi return 0 }