package/network/config/firewall/files/lib/core_interface.sh

   1 # Copyright (C) 2009-2013 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 $var "$rest"
  32 }
  33
  34 fw_do_interface_rules() {
  35     local action=$1
  36     local zone=$2
  37     local chain=zone_${zone}
  38     local ifname=$3
  39     local subnet=$4
  40     local extra_src="$5"
  41     local extra_dest="$6"
  42
  43     local idev odev inet onet mode
  44     fw_get_family_mode mode x $zone i
  45
  46     fw_get_negation idev '-i' "$ifname"
  47     fw_get_negation odev '-o' "$ifname"
  48
  49     case "$mode/$subnet" in
  50         # Zone supports v6 only or dual, need v6
  51         G6/*:*|i/*:*)
  52             fw_get_negation inet '-s' "$subnet"
  53             fw_get_negation onet '-d' "$subnet"
  54             mode=6
  55         ;;
  56
  57         # Zone supports v4 only or dual, need v4
  58         G4/*.*.*.*|i/*.*.*.*)
  59             fw_get_negation inet '-s' "$subnet"
  60             fw_get_negation onet '-d' "$subnet"
  61             mode=4
  62         ;;
  63
  64         # Need v6 while zone is v4
  65         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
  66
  67         # Need v4 while zone is v6
  68         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
  69
  70         # Strip prefix
  71         *) mode="${mode#G}" ;;
  72     esac
  73
  74     lock /var/run/firewall-interface.lock
  75
  76     fw $action $mode f ${chain}_dest_ACCEPT ACCEPT $ { $odev $onet $extra_dest }
  77     fw $action $mode f ${chain}_src_ACCEPT  ACCEPT $ { $idev $inet $extra_src  }
  78     fw $action $mode f ${chain}_dest_DROP   DROP   $ { $odev $onet $extra_dest }
  79     fw $action $mode f ${chain}_src_DROP    DROP   $ { $idev $inet $extra_src  }
  80     fw $action $mode f ${chain}_dest_REJECT reject $ { $odev $onet $extra_dest }
  81     fw $action $mode f ${chain}_src_REJECT  reject $ { $idev $inet $extra_src  }
  82
  83     [ "$(uci_get_state firewall core "${zone}_tcpmss")" == 1 ] && \
  84         fw $action $mode m ${chain}_MSSFIX TCPMSS $ \
  85             { $odev -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet $extra_dest }
  86
  87     fw $action $mode f delegate_input   ${chain}_input   $ { $idev $inet $extra_src  }
  88     fw $action $mode f delegate_forward ${chain}_forward $ { $idev $inet $extra_src  }
  89     fw $action $mode f delegate_output  ${chain}_output  $ { $odev $onet $extra_dest }
  90
  91     fw $action $mode n PREROUTING ${chain}_prerouting $ { $idev $inet $extra_src  }
  92     fw $action $mode r PREROUTING ${chain}_notrack    $ { $idev $inet $extra_src  }
  93     fw $action $mode n POSTROUTING ${chain}_nat       $ { $odev $onet $extra_dest }
  94
  95     # Flush conntrack table
  96     echo f >/proc/net/nf_conntrack 2>/dev/null
  97
  98     lock -u /var/run/firewall-interface.lock
  99 }
 100
 101 fw_configure_interface() {
 102         local iface=$1
 103         local action=$2
 104         local ifname=$3
 105         local aliasnet=$4
 106
 107         [ "$action" == "add" ] && {
 108                 local status=$(uci_get_state network "$iface" up 0)
 109                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
 110         }
 111
 112         [ -n "$ifname" ] || {
 113                 ifname=$(uci_get_state network "$iface" ifname)
 114                 ifname="${ifname%%:*}"
 115                 [ -z "$ifname" ] && return 0
 116         }
 117
 118         [ "$ifname" == "lo" ] && return 0
 119
 120         fw_callback pre interface
 121
 122         local old_zones old_ifname old_subnets
 123         config_get old_zones core "${iface}_zone"
 124         [ -n "$old_zones" ] && {
 125                 config_get old_ifname core "${iface}_ifname"
 126                 config_get old_subnets core "${iface}_subnets"
 127
 128                 local z
 129                 for z in $old_zones; do
 130                         local n
 131                         for n in ${old_subnets:-""}; do
 132                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
 133                                 fw_do_interface_rules del $z $old_ifname $n
 134                         done
 135
 136                         [ -n "$old_subnets" ] || {
 137                                 fw__uci_state_del "${z}_networks" "$iface"
 138                                 env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 139                         }
 140                 done
 141
 142                 local old_aliases
 143                 config_get old_aliases core "${iface}_aliases"
 144
 145                 local a
 146                 for a in $old_aliases; do
 147                         fw_configure_interface "$a" del "$old_ifname"
 148                 done
 149
 150                 uci_revert_state firewall core "${iface}_zone"
 151                 uci_revert_state firewall core "${iface}_ifname"
 152                 uci_revert_state firewall core "${iface}_subnets"
 153                 uci_revert_state firewall core "${iface}_aliases"
 154         }
 155
 156         [ "$action" == del ] && return
 157
 158         [ -z "$aliasnet" ] && {
 159                 local aliases
 160                 config_get aliases "$iface" aliases
 161
 162                 local a
 163                 for a in $aliases; do
 164                         local ipaddr netmask ip6addr
 165                         config_get ipaddr "$a" ipaddr
 166                         config_get netmask "$a" netmask
 167                         config_get ip6addr "$a" ip6addr
 168
 169                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
 170                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
 171                 done
 172
 173                 fw_sysctl_interface $ifname
 174                 fw_callback post interface
 175
 176                 uci_toggle_state firewall core "${iface}_aliases" "$aliases"
 177         } || {
 178                 local subnets=
 179                 config_get subnets core "${iface}_subnets"
 180                 append subnets "$aliasnet"
 181
 182                 config_set core "${iface}_subnets" "$subnets"
 183                 uci_toggle_state firewall core "${iface}_subnets" "$subnets"
 184         }
 185
 186         local new_zones=
 187         load_zone() {
 188                 fw_config_get_zone "$1"
 189                 list_contains zone_network "$iface" || return
 190
 191                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
 192                 fw_do_interface_rules add ${zone_name} "$ifname" "$aliasnet"
 193                 append new_zones $zone_name
 194
 195                 [ -n "$aliasnet" ] || {
 196                         fw__uci_state_add "${zone_name}_networks" "${zone_network}"
 197                         env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 198                 }
 199         }
 200         config_foreach load_zone zone
 201
 202         uci_toggle_state firewall core "${iface}_zone" "$new_zones"
 203         uci_toggle_state firewall core "${iface}_ifname" "$ifname"
 204 }
 205
 206 fw_sysctl_interface() {
 207         local ifname=$1
 208         {
 209                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 210                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
 211                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 212                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
 213         } >/dev/null 2>/dev/null
 214 }