###--------------------------------------------------------------------------
### Packet classification.
+## IPv4 addressing.
+##
+## There are two small blocks of publicly routable IPv4 addresses, and a
+## block of RFC1918 private-use addresses allocated from the Cambridge G-RIN.
+## The former are as follows.
+##
+## 62.49.204.144/28
+## House border network (dmz). We have all of these, but .145
+## is reserved for the router.
+##
+## 212.13.18.64/28
+## Jump colocated network (jump). .65--68 are used by Jump
+## network infrastructure; we get the rest.
+##
+## The latter is the block 172.29.196.0/22. Currently the low half is
+## unallocated (and may be returned to the G-RIN); the remaining addresses
+## are allocated as follows.
+##
+## 172.29.198.0/24 Untrusted networks.
+## .0/25 house wireless net
+## .128/28 iodine (IP-over-DNS) network
+## .160/27 untrusted virtual network
+##
+## 172.29.199.0/24 Trusted networks.
+## .0/25 house wired network
+## .128/27 mobile VPN hosts
+## .160/28 reserved, except .160/30 allocated for ITS
+## .176/28 internal colocated network
+## .192/27 house safe network
+## .224/27 anycast services
+
+## IPv6 addressing.
+##
+## There are five blocks of publicly routable IPv6 addresses, though some of
+## them aren't very interesting. The ranges are as follows.
+##
+## 2001:470:1f08:1b98::/64
+## Hurricane Electric tunnel network: only :1 (HE) and :2
+## (radius) are used.
+##
+## 2001:470:1f09:1b98::/64
+## House border network (dmz).
+##
+## 2001:470:9740::/48
+## Main house range. See below for allocation policy.
+##
+## 2001:ba8:0:1d9::/64
+## Jump border network (jump): :1 is the router (supplied by
+## Jump); other addresses are ours.
+##
+## 2001:ba8:1d9::/48
+## Main colocated range. See below for allocation policy.
+##
+## Addresses in the /64 networks are simply allocated in ascending order.
+## The /48s are split into /64s by appending a 16-bit network number. The
+## top nibble of the network number classifies the network, as follows.
+##
+## axxx Virtual, untrusted
+## 8xxx Untrusted
+## 6xxx Virtual, safe
+## 4xxx Safe
+## 0xxx Unsafe, trusted
+##
+## These have been chosen so that network properties can be deduced by
+## inspecting bits of the network number:
+##
+## Bit 15 If set, the network is untrusted; otherwise it is trusted.
+## Bit 14 If set, the network is safe; otherwise it is unsafe.
+##
+## Finally, the low-order nibbles identify the site.
+##
+## 0 No specific site: mobile VPN endpoints or anycast addresses.
+## 1 House.
+## 2 Jump colocation.
+##
+## Usually site-0 networks are allocated from the Jump range to improve
+## expected performance from/to external sites which don't engage in our
+## dynamic routing protocols.
+
## Define the available network classes.
m4_divert(42)m4_dnl
-defnetclass untrusted untrusted trusted mcast
-defnetclass trusted untrusted trusted safe noloop mcast
-defnetclass safe trusted safe noloop mcast
-defnetclass noloop trusted safe mcast
+defnetclass scary scary trusted mcast
+defnetclass untrusted scary untrusted trusted mcast
+defnetclass trusted scary untrusted trusted safe noloop mcast
+defnetclass safe trusted safe noloop mcast
+defnetclass noloop trusted safe mcast
+
defnetclass link
defnetclass mcast
m4_divert(-1)
## House networks.
defnet dmz trusted
addr 62.49.204.144/28 2001:470:1f09:1b98::/64
- forwards unsafe untrusted
+ via unsafe untrusted
defnet unsafe trusted
addr 172.29.199.0/25 2001:470:9740:1::/64
- forwards househub
+ via househub
defnet safe safe
addr 172.29.199.192/27 2001:470:9740:4001::/64
- forwards househub
+ via househub
defnet untrusted untrusted
addr 172.29.198.0/25 2001:470:9740:8001::/64
- forwards househub
+ via househub
defnet househub virtual
- forwards housebdry dmz unsafe safe untrusted
+ via housebdry dmz unsafe safe untrusted
defnet housebdry virtual
- forwards househub hub
- noxit dmz
+ via househub hub
## House hosts.
defhost radius
iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
- iface eth3 untrusted vpn default
+ iface eth3 unsafe untrusted vpn default
iface ppp0 default
iface t6-he default
iface vpn-precision colobdry vpn sgo
defhost jem
iface eth0 dmz unsafe
iface eth1 dmz unsafe
+defhost universe
+ iface eth0 dmz unsafe
+ iface eth1 dmz unsafe
defhost artist
hosttype router
iface eth0 dmz unsafe untrusted
iface eth1 dmz unsafe untrusted
- iface eth3 untrusted
+ iface eth3 unsafe untrusted
defhost vampire
hosttype router
iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry
iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry
iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry
- iface eth0.7 untrusted
+ iface eth0.7 unsafe untrusted vpn
iface vpn-precision colobdry vpn sgo
iface vpn-chiark sgo
iface vpn-+ vpn
defhost ibanez
iface br-dmz dmz unsafe
iface br-unsafe unsafe
+defhost orange
+ iface wlan0 untrusted
+ iface vpn-radius unsafe
+defhost groove
+ iface eth0 unsafe
+ iface wlan0 untrusted
+ iface vpn-radius unsafe
defhost gibson
hosttype client
- iface eth0 unsafe
+ iface eth0.5 unsafe
## Colocated networks.
defnet jump trusted
addr 212.13.198.64/28 2001:ba8:0:1d9::/64
- forwards colohub
+ via colohub
defnet colo trusted
addr 172.29.199.176/28 2001:ba8:1d9:2::/64
- forwards colohub
+ via colohub
defnet colohub virtual
- forwards colobdry jump colo iodine
+ via colobdry jump colo
defnet colobdry virtual
- forwards colohub hub
- noxit jump
+ via colohub hub
defnet iodine untrusted
addr 172.29.198.128/28
- forwards colohub
+ via colohub
## Colocated hosts.
defhost fender
iface br-colo jump colo
defhost precision
hosttype router
- iface eth0 jump colo sgo
- iface eth1 jump colo sgo
+ iface eth0 jump colo vpn sgo
+ iface eth1 jump colo vpn sgo
+ iface vpn-mango binswood
iface vpn-radius housebdry vpn sgo
iface vpn-chiark sgo
+ iface vpn-national upn
iface vpn-+ vpn
defhost telecaster
iface eth0 jump colo
iface eth0 jump colo
iface eth1 jump colo
defhost jazz
- iface eth0 jump colo
- iface eth1 jump colo
+ hosttype router
+ iface eth0 jump colo vpn
+ iface eth1 jump colo vpn
iface dns0 iodine
+ iface vpn-+ vpn
## Other networks.
defnet hub virtual
- forwards housebdry colobdry
+ via housebdry colobdry
defnet sgo noloop
addr !172.29.198.0/23
addr 10.0.0.0/8
addr 172.16.0.0/12
addr 192.168.0.0/16
- forwards househub colohub
+ via househub colohub
defnet vpn safe
addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
- forwards househub colohub
- host crybaby 1
- host terror 2
+ via househub colohub
+ host crybaby 1 ::1:1
+ host terror 2 ::2:1
+ host orange 3 ::3:1
+ host haze 4 ::4:1
+ host groove 5 ::5:1
defnet anycast trusted
addr 172.29.199.224/27 2001:ba8:1d9:0::/64
- forwards dmz unsafe safe untrusted jump colo vpn
-defnet default untrusted
+ via dmz unsafe safe untrusted jump colo vpn
+defnet default scary
addr 62.49.204.144/28 2001:470:1f09:1b98::/64
addr 212.13.198.64/28 2001:ba8:0:1d9::/64
addr 2001:ba8:1d9::/48 #temporary
- forwards dmz unsafe untrusted jump colo
+ via dmz unsafe untrusted jump colo
+defnet upn untrusted
+ addr 172.29.198.160/27 2001:ba8:1d9:a000::/64
+ via colohub
+ host national 1 ::1:1
+
+## Linode hosts.
+defhost national
+ iface eth0 default
+ iface vpn-precision colohub
+
+## Satellite networks.
+defnet binswood noloop
+ addr 10.165.27.0/24
+ via colohub
+defhost mango
+ hosttype router
+ iface eth0 binswood default
+ iface vpn-precision colo
+
+m4_divert(80)m4_dnl
+###--------------------------------------------------------------------------
+### Connection tracking helper modules.
+
+for i in ftp; do
+ modprobe nf_conntrack_$i
+done
m4_divert(80)m4_dnl
###--------------------------------------------------------------------------
-p udp --source-port $port_bootpc --destination-port $port_bootps
## Allow incoming ping. This is the only ICMP left.
-run ip46tables -A inbound -j ACCEPT -p icmp
+run iptables -A inbound -j ACCEPT -p icmp
+run ip6tables -A inbound -j ACCEPT -p icmpv6
m4_divert(88)m4_dnl
## Allow unusual things.
## Inspect inbound packets from untrusted sources.
run ip46tables -A inbound -j forbidden
+run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound
run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
+## Allow responses from the scary outside world into the untrusted net, but
+## don't let untrusted things run services.
+case $forward in
+ 1)
+ run ip46tables -A FORWARD -j ACCEPT \
+ -m mark --mark $(( $from_scary | $to_untrusted ))/$(( $MASK_FROM | $MASK_TO )) \
+ -m state --state ESTABLISHED,RELATED
+ ;;
+esac
+
## Otherwise process as indicated by the mark.
for i in $inchains; do
run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
~mdw / firewall / blobdiff