bc9eb96ddedc2faa349ccc40d72fa63203229a00
[openwrt-10.03/.git] / package / firewall / files / lib / core_interface.sh
1 # Copyright (C) 2009-2010 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 $var) "
8         val="${val// $item / }"
9         val="${val# }"
10         val="${val% }"
11         uci_revert_state firewall core $var
12         uci_set_state firewall core $var "${val:+$val }$item"
13 }
14
15 fw__uci_state_del() {
16         local var="$1"
17         local item="$2"
18
19         local val=" $(uci_get_state firewall core $var) "
20         val="${val// $item / }"
21         val="${val# }"
22         val="${val% }"
23         uci_revert_state firewall core $var
24         uci_set_state firewall core $var "$val"
25 }
26
27 fw_configure_interface() {
28         local iface=$1
29         local action=$2
30         local ifname=$3
31         local aliasnet=$4
32
33         [ "$action" == "add" ] && {
34                 local status=$(uci_get_state network "$iface" up 0)
35                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
36         }
37
38         [ -n "$ifname" ] || {
39                 ifname=$(uci_get_state network "$iface" ifname)
40                 ifname="${ifname%%:*}"
41                 [ -z "$ifname" ] && return 0
42         }
43
44         [ "$ifname" == "lo" ] && return 0
45
46         fw_callback pre interface
47
48         fw__do_rules() {
49                 local action=$1
50                 local zone=$2
51                 local chain=zone_${zone}
52                 local ifname=$3
53                 local subnet=$4
54
55                 local inet onet mode
56                 fw_get_family_mode mode x $zone i
57
58                 case "$mode/$subnet" in
59                         # Zone supports v6 only or dual, need v6
60                         G6/*:*|i/*:*)
61                                 inet="-s $subnet -d ::/0"
62                                 onet="-s ::/0 -d $subnet"
63                                 mode=6
64                         ;;
65
66                         # Zone supports v4 only or dual, need v4
67                         G4/*.*.*.*|i/*.*.*.*)
68                                 inet="-s $subnet -d 0.0.0.0/0"
69                                 onet="-s 0.0.0.0/0 -d $subnet"
70                                 mode=4
71                         ;;
72
73                         # Need v6 while zone is v4
74                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
75
76                         # Need v4 while zone is v6
77                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
78
79                         # Strip prefix
80                         *) mode="${mode#G}" ;;
81                 esac
82
83                 lock /var/run/firewall-interface.lock
84
85                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
86                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
87                 fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
88                 fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
89                 fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
90                 fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
91
92                 fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
93
94                 fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
95                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
96                 fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
97                 fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
98                 fw $action $mode n POSTROUTING ${chain}_nat       $ { -o "$ifname" $onet }
99
100                 lock -u /var/run/firewall-interface.lock
101         }
102
103         local old_zones old_ifname old_subnets
104         config_get old_zones core "${iface}_zone"
105         [ -n "$old_zones" ] && {
106                 config_get old_ifname core "${iface}_ifname"
107                 config_get old_subnets core "${iface}_subnets"
108
109                 local z
110                 for z in $old_zones; do
111                         local n
112                         for n in ${old_subnets:-""}; do
113                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
114                                 fw__do_rules del $z $old_ifname $n
115                         done
116
117                         [ -n "$old_subnets" ] || {
118                                 fw__uci_state_del "${z}_networks" "$iface"
119                                 env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
120                         }
121                 done
122
123                 local old_aliases
124                 config_get old_aliases core "${iface}_aliases"
125
126                 local a
127                 for a in $old_aliases; do
128                         fw_configure_interface "$a" del "$old_ifname"
129                 done
130
131                 uci_revert_state firewall core "${iface}_zone"
132                 uci_revert_state firewall core "${iface}_ifname"
133                 uci_revert_state firewall core "${iface}_subnets"
134                 uci_revert_state firewall core "${iface}_aliases"
135         }
136
137         [ "$action" == del ] && return
138
139         [ -z "$aliasnet" ] && {
140                 local aliases
141                 config_get aliases "$iface" aliases
142
143                 local a
144                 for a in $aliases; do
145                         local ipaddr netmask ip6addr
146                         config_get ipaddr "$a" ipaddr
147                         config_get netmask "$a" netmask
148                         config_get ip6addr "$a" ip6addr
149
150                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
151                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
152                 done
153
154                 fw_sysctl_interface $ifname
155                 fw_callback post interface
156
157                 uci_set_state firewall core "${iface}_aliases" "$aliases"
158         } || {
159                 local subnets=
160                 config_get subnets core "${iface}_subnets"
161                 append subnets "$aliasnet"
162
163                 config_set core "${iface}_subnets" "$subnets"
164                 uci_set_state firewall core "${iface}_subnets" "$subnets"
165         }
166
167         local new_zones=
168         load_zone() {
169                 fw_config_get_zone "$1"
170                 list_contains zone_network "$iface" || return
171
172                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
173                 fw__do_rules add ${zone_name} "$ifname" "$aliasnet"
174                 append new_zones $zone_name
175
176                 [ -n "$aliasnet" ] || {
177                         fw__uci_state_add "${zone_name}_networks" "${zone_network}"
178                         env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
179                 }
180         }
181         config_foreach load_zone zone
182
183         uci_set_state firewall core "${iface}_zone" "$new_zones"
184         uci_set_state firewall core "${iface}_ifname" "$ifname"
185 }
186
187 fw_sysctl_interface() {
188         local ifname=$1
189         {
190                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
191                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
192                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
193                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
194         } >/dev/null 2>/dev/null
195 }
196