| 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 | |
| 204 | |
