ed6a4b150fd9414f0a229903445d86b30fc1f375
[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_set_state firewall core $var "${val:+$val }$item"
12 }
13
14 fw__uci_state_del() {
15         local var="$1"
16         local item="$2"
17
18         local val=" $(uci_get_state firewall core $var) "
19         val="${val// $item / }"
20         val="${val# }"
21         val="${val% }"
22         uci_set_state firewall core $var "$val"
23 }
24
25 fw_configure_interface() {
26         local iface=$1
27         local action=$2
28         local ifname=$3
29         local aliasnet=$4
30
31         [ "$action" == "add" ] && {
32                 local status=$(uci_get_state network "$iface" up 0)
33                 [ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
34         }
35
36         [ -n "$ifname" ] || {
37                 ifname=$(uci_get_state network "$iface" ifname)
38                 ifname="${ifname%%:*}"
39                 [ -z "$ifname" ] && return 0
40         }
41
42         [ "$ifname" == "lo" ] && return 0
43
44         fw_callback pre interface
45
46         fw__do_rules() {
47                 local action=$1
48                 local zone=$2
49                 local chain=zone_${zone}
50                 local ifname=$3
51                 local subnet=$4
52
53                 local inet onet mode
54                 fw_get_family_mode mode x $zone i
55
56                 case "$mode/$subnet" in
57                         # Zone supports v6 only or dual, need v6
58                         G6/*:*|i/*:*)
59                                 inet="-s $subnet -d ::/0"
60                                 onet="-s ::/0 -d $subnet"
61                                 mode=6
62                         ;;
63
64                         # Zone supports v4 only or dual, need v4
65                         G4/*.*.*.*|i/*.*.*.*)
66                                 inet="-s $subnet -d 0.0.0.0/0"
67                                 onet="-s 0.0.0.0/0 -d $subnet"
68                                 mode=4
69                         ;;
70
71                         # Need v6 while zone is v4
72                         */*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
73
74                         # Need v4 while zone is v6
75                         */*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
76
77                         # Strip prefix
78                         *) mode="${mode#G}" ;;
79                 esac
80
81                 lock /var/run/firewall-interface.lock
82
83                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
84                 fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
85                 fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
86                 fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
87                 fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
88                 fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
89
90                 fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
91
92                 fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
93                 fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
94                 fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
95                 fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
96                 fw $action $mode n POSTROUTING ${chain}_nat       $ { -o "$ifname" $onet }
97
98                 lock -u /var/run/firewall-interface.lock
99         }
100
101         local old_zones old_ifname old_subnets
102         config_get old_zones core "${iface}_zone"
103         [ -n "$old_zones" ] && {
104                 config_get old_ifname core "${iface}_ifname"
105                 config_get old_subnets core "${iface}_subnets"
106
107                 local z
108                 for z in $old_zones; do
109                         local n
110                         for n in ${old_subnets:-""}; do
111                                 fw_log info "removing $iface ($old_ifname${n:+ alias $n}) from zone $z"
112                                 fw__do_rules del $z $old_ifname $n
113                         done
114
115                         [ -n "$old_subnets" ] || {
116                                 fw__uci_state_del "${z}_networks" "$iface"
117                                 env -i ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
118                         }
119                 done
120
121                 local old_aliases
122                 config_get old_aliases core "${iface}_aliases"
123
124                 local a
125                 for a in $old_aliases; do
126                         fw_configure_interface "$a" del "$old_ifname"
127                 done
128
129                 uci_revert_state firewall core "${iface}_zone"
130                 uci_revert_state firewall core "${iface}_ifname"
131                 uci_revert_state firewall core "${iface}_subnets"
132                 uci_revert_state firewall core "${iface}_aliases"
133         }
134
135         [ "$action" == del ] && return
136
137         [ -z "$aliasnet" ] && {
138                 local aliases
139                 config_get aliases "$iface" aliases
140
141                 local a
142                 for a in $aliases; do
143                         local ipaddr netmask ip6addr
144                         config_get ipaddr "$a" ipaddr
145                         config_get netmask "$a" netmask
146                         config_get ip6addr "$a" ip6addr
147
148                         [ -n "$ipaddr" ] && fw_configure_interface "$a" add "" "$ipaddr${netmask:+/$netmask}"
149                         [ -n "$ip6addr" ] && fw_configure_interface "$a" add "" "$ip6addr"
150                 done
151
152                 fw_sysctl_interface $ifname
153                 fw_callback post interface
154
155                 uci_set_state firewall core "${iface}_aliases" "$aliases"
156         } || {
157                 local subnets=
158                 config_get subnets core "${iface}_subnets"
159                 append subnets "$aliasnet"
160
161                 config_set core "${iface}_subnets" "$subnets"
162                 uci_set_state firewall core "${iface}_subnets" "$subnets"
163         }
164
165         local new_zones=
166         load_zone() {
167                 fw_config_get_zone "$1"
168                 list_contains zone_network "$iface" || return
169
170                 fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
171                 fw__do_rules add ${zone_name} "$ifname" "$aliasnet"
172                 append new_zones $zone_name
173
174                 [ -n "$aliasnet" ] || {
175                         fw__uci_state_add "${zone_name}_networks" "${zone_network}"
176                         env -i ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
177                 }
178         }
179         config_foreach load_zone zone
180
181         uci_set_state firewall core "${iface}_zone" "$new_zones"
182         uci_set_state firewall core "${iface}_ifname" "$ifname"
183 }
184
185 fw_sysctl_interface() {
186         local ifname=$1
187         {
188                 sysctl -w net.ipv4.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
189                 sysctl -w net.ipv6.conf.${ifname}.accept_redirects=$FW_ACCEPT_REDIRECTS
190                 sysctl -w net.ipv4.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
191                 sysctl -w net.ipv6.conf.${ifname}.accept_source_route=$FW_ACCEPT_SRC_ROUTE
192         } >/dev/null 2>/dev/null
193 }
194