package/network/config/firewall/files/reflection.hotplug

   1 #!/bin/sh
   2
   3 . /lib/functions.sh
   4 . /lib/functions/network.sh
   5
   6 if [ "$ACTION" = "remove" ]; then
   7
   8         delete_rules_by_comment() {
   9                 local table="$1"
  10                 local chain="$2"
  11                 local comment="$3"
  12
  13                 iptables -t "$table" --line-numbers -nL "$chain" 2>/dev/null | \
  14                         sed -e '
  15                                 1d;
  16                                 1! {
  17                                         \#^[0-9]\+ .* /\* '"$comment"' \*/.*$# {
  18                                                 s/ .*$//;
  19                                                 G; h;
  20                                         }
  21                                 };
  22                                 $!d;
  23                         ' | xargs -n1 iptables -t "$table" -D "$chain" 2>/dev/null
  24         }
  25
  26         delete_rules_by_comment nat    nat_reflection_in  "$INTERFACE"
  27         delete_rules_by_comment nat    nat_reflection_out "$INTERFACE"
  28         delete_rules_by_comment filter nat_reflection_fwd "$INTERFACE"
  29
  30 elif [ "$ACTION" = "add" ]; then
  31
  32         prepare_chains() {
  33                 iptables -t nat -N nat_reflection_in 2>/dev/null && {
  34                         iptables -t nat -A prerouting_rule -j nat_reflection_in
  35                 }
  36
  37                 iptables -t nat -N nat_reflection_out 2>/dev/null && {
  38                         iptables -t nat -A postrouting_rule -j nat_reflection_out
  39                 }
  40
  41                 iptables -t filter -N nat_reflection_fwd 2>/dev/null && {
  42                         iptables -t filter -A forwarding_rule -j nat_reflection_fwd
  43                 }
  44         }
  45
  46         find_networks() {
  47                 find_networks_cb() {
  48                         local cfg="$1"
  49                         local zone="$2"
  50                         local need_masq="${3:-0}"
  51
  52                         local name
  53                         config_get name "$cfg" name
  54
  55                         local masq
  56                         config_get_bool masq "$cfg" masq 0
  57
  58                         [ "$name" = "$zone" ] && [ "$masq" -ge "$need_masq" ] && {
  59                                 local network
  60                                 config_get network "$cfg" network
  61
  62                                 echo ${network:-$zone}
  63                                 return 1
  64                         }
  65                 }
  66
  67                 config_foreach find_networks_cb zone "$1"
  68         }
  69
  70         setup_fwd() {
  71                 local cfg="$1"
  72
  73                 local reflection
  74                 config_get_bool reflection "$cfg" reflection 1
  75                 [ "$reflection" == 1 ] || return
  76
  77                 local src
  78                 config_get src "$cfg" src
  79                 [ "$src" == "$ZONE" ] || return
  80
  81                 local dest
  82                 config_get dest "$cfg" dest
  83                 [ "$dest" != "*" ] || return
  84
  85                 local target
  86                 config_get target "$cfg" target DNAT
  87                 [ "$target" = DNAT ] || return
  88
  89                 prepare_chains
  90
  91                 local net
  92                 for net in $(find_networks "$dest" 0); do
  93                         local intnet
  94                         network_get_subnet intnet "$net" || continue
  95
  96                         local proto
  97                         config_get proto "$cfg" proto
  98
  99                         local epmin epmax extport
 100                         config_get extport "$cfg" src_dport "1-65535"
 101                         [ -n "$extport" ] || return
 102
 103                         epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
 104                         [ "${epmin#!}" != "$epmax" ] || epmax=""
 105
 106                         local ipmin ipmax intport
 107                         config_get intport "$cfg" dest_port "$extport"
 108
 109                         ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
 110                         [ "${ipmin#!}" != "$ipmax" ] || ipmax=""
 111
 112                         local exthost
 113                         config_get exthost "$cfg" src_dip "$extip"
 114
 115                         local inthost
 116                         config_get inthost "$cfg" dest_ip
 117                         [ -n "$inthost" ] || return
 118
 119                         [ "$proto" = all    ] && proto="tcp udp"
 120                         [ "$proto" = tcpudp ] && proto="tcp udp"
 121
 122                         [ "${inthost#!}" = "$inthost" ] || return 0
 123                         [ "${exthost#!}" = "$exthost" ] || return 0
 124
 125                         [ "${epmin#!}" != "$epmin" ] && \
 126                                 extport="! --dport ${epmin#!}${epmax:+:$epmax}" || \
 127                                 extport="--dport $epmin${epmax:+:$epmax}"
 128
 129                         [ "${ipmin#!}" != "$ipmin" ] && \
 130                                 intport="! --dport ${ipmin#!}${ipmax:+:$ipmax}" || \
 131                                 intport="--dport $ipmin${ipmax:+:$ipmax}"
 132
 133                         local p
 134                         for p in ${proto:-tcp udp}; do
 135                                 case "$p" in
 136                                         tcp|udp|6|17)
 137                                                 iptables -t nat -A nat_reflection_in \
 138                                                         -s $intnet -d $exthost \
 139                                                         -p $p $extport \
 140                                                         -m comment --comment "$INTERFACE" \
 141                                                         -j DNAT --to $inthost:${ipmin#!}${ipmax:+-$ipmax}
 142
 143                                                 iptables -t nat -A nat_reflection_out \
 144                                                         -s $intnet -d $inthost \
 145                                                         -p $p $intport \
 146                                                         -m comment --comment "$INTERFACE" \
 147                                                         -j SNAT --to-source ${intnet%%/*}
 148
 149                                                 iptables -t filter -A nat_reflection_fwd \
 150                                                         -s $intnet -d $inthost \
 151                                                         -p $p $intport \
 152                                                         -m comment --comment "$INTERFACE" \
 153                                                         -j ACCEPT
 154                                         ;;
 155                                 esac
 156                         done
 157                 done
 158         }
 159
 160         config_load firewall
 161
 162         local is_masq_zone="$(find_networks "$ZONE" 1)"
 163         [ -n "$is_masq_zone" ] || exit 0
 164
 165         local extip
 166         network_get_ipaddr extip "$INTERFACE" || exit 0
 167
 168         config_foreach setup_fwd redirect
 169 fi