package/firewall/files/lib/core_interface.sh

   1 # Copyright (C) 2009-2011 OpenWrt.org
   2
   3 fw__uci_state_add() {
   4         local var="$1"
   5         local item="$2"
   6
   7         local val="$(uci_get_state firewall core $var)"
   8         local e1; for e1 in $item; do
   9                 local e2; for e2 in $val; do
  10                         [ "$e1" = "$e2" ] && e1=""
  11                 done
  12                 val="${val:+$val${e1:+ }}$e1"
  13         done
  14
  15         uci_toggle_state firewall core $var "$val"
  16 }
  17
  18 fw__uci_state_del() {
  19         local var="$1"
  20         local item="$2"
  21
  22         local rest=""
  23         local val="$(uci_get_state firewall core $var)"
  24         local e1; for e1 in $val; do
  25                 local e2; for e2 in $item; do
  26                         [ "$e1" = "$e2" ] && e1=""
  27                 done
  28                 rest="${rest:+$rest${e1:+ }}$e1"
  29         done
  30
  31         uci_toggle_state firewall core $var "$val"
  32 }
  33
  34 fw_configure_interface() {
  35         local iface=$1
  36         local action=$2
  37         local ifname=$3
  38         local aliasnet=$4
  39
  40         [ "$action" == "add" ] && {
  41                 local status=$(uci_get_state network "$iface" up 0)
  42                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
  43         }
  44
  45         [ -n "$ifname" ] || {
  46                 ifname=$(uci_get_state network "$iface" ifname)
  47                 ifname="${ifname%%:*}"
  48                 [ -z "$ifname" ] && return 0
  49         }
  50
  51         [ "$ifname" == "lo" ] && return 0
  52
  53         fw_callback pre interface
  54
  55         fw__do_rules() {
  56                 local action=$1
  57                 local zone=$2
  58                 local chain=zone_${zone}
  59                 local ifname=$3
  60                 local subnet=$4
  61
  62                 local inet onet mode
  63                 fw_get_family_mode mode x $zone i
  64
  65                 case "$mode/$subnet" in
  66                         # Zone supports v6 only or dual, need v6
  67                         G6/*:*|i/*:*)
  68                                 inet="-s $subnet -d ::/0"
  69                                 onet="-s ::/0 -d $subnet"
  70                                 mode=6
  71                         ;;
  72
  73                         # Zone supports v4 only or dual, need v4
  74                         G4/*.*.*.*|i/*.*.*.*)
  75                                 inet="-s $subnet -d 0.0.0.0/0"
  76                                 onet="-s 0.0.0.0/0 -d $subnet"
  77                                 mode=4
  78                         ;;
  79
  80                         # Need v6 while zone is v4
  81                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
  82
  83                         # Need v4 while zone is v6
  84                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
  85
  86                         # Strip prefix
  87                         *) mode="${mode#G}" ;;
  88                 esac
  89
  90                 lock /var/run/firewall-interface.lock
  91
  92                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
  93                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
  94                 fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
  95                 fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
  96                 fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
  97                 fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
  98
  99                 fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
 100
 101                 fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
 102                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
 103                 fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
 104                 fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
 105                 fw $action $mode n POSTROUTING ${chain}_nat       $ { -o "$ifname" $onet }
 106
 107                 lock -u /var/run/firewall-interface.lock
 108         }
 109
 110         local old_zones old_ifname old_subnets
 111         config_get old_zones core "${iface}_zone"
 112         [ -n "$old_zones" ] && {
 113                 config_get old_ifname core "${iface}_ifname"
 114                 config_get old_subnets core "${iface}_subnets"
 115
 116                 local z
 117                 for z in $old_zones; do
 118                         local n
 119                         for n in ${old_subnets:-""}; do
 120                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
 121                                 fw__do_rules del $z $old_ifname $n
 122                         done
 123
 124                         [ -n "$old_subnets" ] || {
 125                                 fw__uci_state_del "${z}_networks" "$iface"
 126                                 env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 127                         }
 128                 done
 129
 130                 local old_aliases
 131                 config_get old_aliases core "${iface}_aliases"
 132
 133                 local a
 134                 for a in $old_aliases; do
 135                         fw_configure_interface "$a" del "$old_ifname"
 136                 done
 137
 138                 uci_revert_state firewall core "${iface}_zone"
 139                 uci_revert_state firewall core "${iface}_ifname"
 140                 uci_revert_state firewall core "${iface}_subnets"
 141                 uci_revert_state firewall core "${iface}_aliases"
 142         }
 143
 144         [ "$action" == del ] && return
 145
 146         [ -z "$aliasnet" ] && {
 147                 local aliases
 148                 config_get aliases "$iface" aliases
 149
 150                 local a
 151                 for a in $aliases; do
 152                         local ipaddr netmask ip6addr
 153                         config_get ipaddr "$a" ipaddr
 154                         config_get netmask "$a" netmask
 155                         config_get ip6addr "$a" ip6addr
 156
 157                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
 158                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
 159                 done
 160
 161                 fw_sysctl_interface $ifname
 162                 fw_callback post interface
 163
 164                 uci_toggle_state firewall core "${iface}_aliases" "$aliases"
 165         } || {
 166                 local subnets=
 167                 config_get subnets core "${iface}_subnets"
 168                 append subnets "$aliasnet"
 169
 170                 config_set core "${iface}_subnets" "$subnets"
 171                 uci_toggle_state firewall core "${iface}_subnets" "$subnets"
 172         }
 173
 174         local new_zones=
 175         load_zone() {
 176                 fw_config_get_zone "$1"
 177                 list_contains zone_network "$iface" || return
 178
 179                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
 180                 fw__do_rules add ${zone_name} "$ifname" "$aliasnet"
 181                 append new_zones $zone_name
 182
 183                 [ -n "$aliasnet" ] || {
 184                         fw__uci_state_add "${zone_name}_networks" "${zone_network}"
 185                         env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 186                 }
 187         }
 188         config_foreach load_zone zone
 189
 190         uci_toggle_state firewall core "${iface}_zone" "$new_zones"
 191         uci_toggle_state firewall core "${iface}_ifname" "$ifname"
 192 }
 193
 194 fw_sysctl_interface() {
 195         local ifname=$1
 196         {
 197                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 198                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 199                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 200                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 201         } >/dev/null 2>/dev/null
 202 }
 203