Compare commits
No commits in common. "b014c03b21e2d59b72cc3c828248f1378612ed7b" and "5cd290eeba08233bb462d8340c3ffdb7bdeae84f" have entirely different histories.
b014c03b21
...
5cd290eeba
1 changed files with 52 additions and 172 deletions
|
|
@ -1,52 +1,27 @@
|
|||
# astrnet.nix — AstrNet peer "michaotic". Generated by astrnet-join.sh.
|
||||
# astrnet.nix — AstrNet stub peer "michaotic". Generated by astrnet-join.sh.
|
||||
#
|
||||
# Identity 10.0.0.9 / 2a05:f480:2400:1cf7::9, ASN 4200000009, two WireGuard
|
||||
# legs that THIS host dials:
|
||||
# wg-mic-bd8 -> bd8816 (Moscow) PRIMARY, pair 39
|
||||
# wg-mic-der -> alderamin (Helsinki) backup, pair 38
|
||||
# What this host is to the mesh: identity 10.0.0.9 / 2a05:f480:2400:1cf7::9,
|
||||
# ASN 4200000009, two WireGuard legs that THIS host dials:
|
||||
# wg-mic-der -> alderamin (Helsinki) primary, pair 38
|
||||
# wg-mic-bd8 -> bd8816 (Moscow) backup, pair 39 (paths come prepended)
|
||||
# It announces only its identity and accepts only mesh address space; it
|
||||
# never becomes transit and never takes a default route from the mesh.
|
||||
#
|
||||
# Egress works like an AstrNet client: both legs announce a default route,
|
||||
# and this host sends all its traffic into the mesh. The far end splits it:
|
||||
# RU destinations leave via the RU exit, everything else via the
|
||||
# international exits. Exceptions stay on the WAN: WireGuard's own packets,
|
||||
# replies from the WAN address (inbound services keep working), and the cloud
|
||||
# metadata service. If both BGP sessions drop, the BGP default is withdrawn
|
||||
# and the WAN default takes over on its own.
|
||||
#
|
||||
# The WAN values below were detected at install time. Everything else is
|
||||
# assigned by the AstrNet admin; do not renumber it.
|
||||
# All values are assigned by the AstrNet admin. Do not renumber anything
|
||||
# here without them: the far ends are configured to match exactly.
|
||||
{ config, lib, pkgs, ... }:
|
||||
let
|
||||
keyFile = "/var/lib/astrnet/wg.key";
|
||||
id4 = "10.0.0.9";
|
||||
id6 = "2a05:f480:2400:1cf7::9";
|
||||
|
||||
# ── Detected WAN ──
|
||||
wanIf = "enp7s0";
|
||||
wanGw4 = "10.130.0.1";
|
||||
wanIp4 = "10.130.0.36";
|
||||
wanGw6 = ""; # "" when there is no IPv6 WAN
|
||||
wanIp6 = "";
|
||||
|
||||
# Table holding the WAN default for the exceptions above, and the mark on
|
||||
# WireGuard's outer UDP that selects it (without it the tunnels would try
|
||||
# to reach their own endpoints through the mesh default).
|
||||
wanTable = "100";
|
||||
wgMark = "0x4d49";
|
||||
wanRules =
|
||||
[ { fam = "-4"; sel = "fwmark ${wgMark}"; }
|
||||
{ fam = "-4"; sel = "from ${wanIp4}"; }
|
||||
]
|
||||
++ lib.optional (wanGw6 != "") { fam = "-6"; sel = "fwmark ${wgMark}"; }
|
||||
++ lib.optional (wanGw6 != "" && wanIp6 != "") { fam = "-6"; sel = "from ${wanIp6}"; };
|
||||
|
||||
mkLeg = { listenPort, ips, publicKey, endpoint }: {
|
||||
inherit ips listenPort;
|
||||
privateKeyFile = keyFile;
|
||||
mtu = 1380;
|
||||
fwMark = wgMark;
|
||||
# Routing is BGP's job. allowedIPs 0/0 only PERMITS any source through
|
||||
# the tunnel; with routes off it installs nothing.
|
||||
# the tunnel; with routes off, it installs nothing. Turning routes on
|
||||
# would hijack this host's default route.
|
||||
allowedIPsAsRoutes = false;
|
||||
peers = [{
|
||||
inherit publicKey endpoint;
|
||||
|
|
@ -55,35 +30,30 @@ let
|
|||
}];
|
||||
};
|
||||
in {
|
||||
# DHCP keeps the WAN address/DNS but not a competing kernel default route.
|
||||
# FRR otherwise prefers the existing kernel route over the BGP default;
|
||||
# WAN failback is provided by policy table 100 below.
|
||||
networking.dhcpcd.extraConfig = "nogateway";
|
||||
|
||||
networking.wireguard.interfaces = {
|
||||
# The fe80:: link-locals are required: without one FRR's IPv6 BGP
|
||||
# next-hop selection fails and the v6 session never leaves Connect.
|
||||
wg-mic-bd8 = mkLeg {
|
||||
listenPort = 52039;
|
||||
ips = [ "10.99.0.158/30" "fd53:4023:2326:99::9e/126" "fe80::2/64" ];
|
||||
publicKey = "QIvX+avvJqaHxuksGWb6Hx8fv7R6VI5wpaGqLme6Fgw=";
|
||||
endpoint = "195.133.60.217:52039";
|
||||
};
|
||||
wg-mic-der = mkLeg {
|
||||
listenPort = 52038;
|
||||
ips = [ "10.99.0.154/30" "fd53:4023:2326:99::9a/126" "fe80::2/64" ];
|
||||
publicKey = "a4FyXuoI16TxZxv407lSzJV2YFJdq6FgRAtGu+oMzEY=";
|
||||
endpoint = "31.77.105.157:52038";
|
||||
};
|
||||
wg-mic-bd8 = mkLeg {
|
||||
listenPort = 52039;
|
||||
ips = [ "10.99.0.158/30" "fd53:4023:2326:99::9e/126" "fe80::2/64" ];
|
||||
publicKey = "QIvX+avvJqaHxuksGWb6Hx8fv7R6VI5wpaGqLme6Fgw=";
|
||||
endpoint = "195.133.60.217:52039";
|
||||
};
|
||||
};
|
||||
|
||||
# Explicit owner decision: allow all AstrNet members to access Heather's
|
||||
# host services over either WG leg. This does NOT open additional WAN ports,
|
||||
# enable forwarding from AstrNet. Egress routing is configured below.
|
||||
# enable forwarding from AstrNet, or route public traffic through the mesh.
|
||||
# WireGuard peers use allowedIPs 0/0 as an ACL, so do not rely on a packet's
|
||||
# source address to identify a particular AstrNet client here.
|
||||
systemd.services.astrnet-guard = {
|
||||
description = "Allow AstrNet ingress and Docker replies; block new transit";
|
||||
description = "Allow AstrNet host ingress; block AstrNet transit";
|
||||
wantedBy = [ "multi-user.target" ];
|
||||
requiredBy = [ "wireguard-wg-mic-der.service" "wireguard-wg-mic-bd8.service" ];
|
||||
before = [ "wireguard-wg-mic-der.service" "wireguard-wg-mic-bd8.service" ];
|
||||
|
|
@ -97,21 +67,11 @@ in {
|
|||
type filter hook input priority -150; policy accept;
|
||||
# Full inbound access from AstrNet to Heather, IPv4 and IPv6.
|
||||
iifname { "wg-mic-der", "wg-mic-bd8" } accept
|
||||
# bgpd listens on 0.0.0.0 and ::; never expose BGP on public WAN.
|
||||
iifname "enp7s0" tcp dport 179 drop
|
||||
}
|
||||
chain forward {
|
||||
type filter hook forward priority -150; policy accept;
|
||||
# Only replies to Docker-initiated connections, never new mesh transit.
|
||||
iifname { "wg-mic-der", "wg-mic-bd8" } ct state established,related accept
|
||||
iifname { "wg-mic-der", "wg-mic-bd8" } drop
|
||||
}
|
||||
chain postrouting {
|
||||
type nat hook postrouting priority 99; policy accept;
|
||||
# Docker's own MASQUERADE would use the tunnel transit IP, which
|
||||
# AstrNet exits do not NAT. Use the advertised mesh identity instead.
|
||||
oifname { "wg-mic-der", "wg-mic-bd8" } ip saddr { 172.17.0.0/16, 172.18.0.0/16, 172.19.0.0/16 } snat to ${id4}
|
||||
}
|
||||
}
|
||||
RULES
|
||||
'';
|
||||
|
|
@ -136,71 +96,12 @@ in {
|
|||
preStop = "ip link del mesh0 || true";
|
||||
};
|
||||
|
||||
# Traffic that must keep using the WAN even while the mesh default is up.
|
||||
systemd.services.astrnet-wan-policy = {
|
||||
description = "AstrNet: keep tunnel, inbound replies and metadata on the WAN";
|
||||
wantedBy = [ "multi-user.target" ];
|
||||
after = [ "network-online.target" ];
|
||||
wants = [ "network-online.target" ];
|
||||
before = [ "frr.service" ];
|
||||
requiredBy = [ "frr.service" ];
|
||||
path = [ pkgs.iproute2 ];
|
||||
serviceConfig = { Type = "oneshot"; RemainAfterExit = true; };
|
||||
unitConfig.OnFailure = "astrnet-wan-recovery.service";
|
||||
script = ''
|
||||
ip route replace default via ${wanGw4} dev ${wanIf} table ${wanTable}
|
||||
'' + lib.optionalString (wanGw6 != "") ''
|
||||
ip -6 route replace default via ${wanGw6} dev ${wanIf} table ${wanTable}
|
||||
'' + ''
|
||||
# The cloud metadata endpoint must bypass Docker's 169.254/16 link-local
|
||||
# routes; a rule at priority 1000 would never be reached.
|
||||
ip -4 rule del to 169.254.169.254 lookup ${wanTable} priority 998 2>/dev/null || true
|
||||
ip -4 rule add to 169.254.169.254 lookup ${wanTable} priority 998
|
||||
# Specific routes in main (the local subnet, mesh space) always win, so
|
||||
# the WAN table below only ever decides where a DEFAULT would go.
|
||||
for fam in -4 -6; do
|
||||
ip $fam rule del lookup main suppress_prefixlength 0 priority 999 2>/dev/null || true
|
||||
ip $fam rule add lookup main suppress_prefixlength 0 priority 999
|
||||
done
|
||||
'' + lib.concatMapStrings (r: ''
|
||||
ip ${r.fam} rule del ${r.sel} lookup ${wanTable} priority 1000 2>/dev/null || true
|
||||
ip ${r.fam} rule add ${r.sel} lookup ${wanTable} priority 1000
|
||||
'') wanRules + ''
|
||||
# Main BGP default wins; WAN table 100 is used if BGP withdraws it.
|
||||
ip -4 rule del lookup main priority 2000 2>/dev/null || true
|
||||
ip -4 rule add lookup main priority 2000
|
||||
ip -4 rule del lookup ${wanTable} priority 2001 2>/dev/null || true
|
||||
ip -4 rule add lookup ${wanTable} priority 2001
|
||||
# A kernel default in main outranks BGP in FRR itself, regardless of
|
||||
# Linux route metric. Remove it only AFTER the fallback rule is live.
|
||||
ip -4 route del default via ${wanGw4} dev ${wanIf} 2>/dev/null || true
|
||||
'';
|
||||
preStop = ''
|
||||
# On rollback restore the plain WAN path first.
|
||||
ip -4 route replace default via ${wanGw4} dev ${wanIf} metric 1002 || true
|
||||
ip -4 rule del lookup main priority 2000 || true
|
||||
ip -4 rule del lookup ${wanTable} priority 2001 || true
|
||||
ip -4 rule del to 169.254.169.254 lookup ${wanTable} priority 998 || true
|
||||
ip -4 rule del lookup main suppress_prefixlength 0 priority 999 || true
|
||||
ip -6 rule del lookup main suppress_prefixlength 0 priority 999 || true
|
||||
'' + lib.concatMapStrings (r: ''
|
||||
ip ${r.fam} rule del ${r.sel} lookup ${wanTable} priority 1000 || true
|
||||
'') wanRules;
|
||||
};
|
||||
|
||||
# If policy setup fails, leave a normal WAN default rather than a stranded host.
|
||||
systemd.services.astrnet-wan-recovery = {
|
||||
description = "Restore YC WAN route if AstrNet policy fails";
|
||||
path = [ pkgs.iproute2 ];
|
||||
serviceConfig.Type = "oneshot";
|
||||
script = "ip -4 route replace default via ${wanGw4} dev ${wanIf} metric 1002";
|
||||
};
|
||||
|
||||
# BGP only inside the tunnels, never on the public interface.
|
||||
networking.firewall.interfaces."wg-mic-bd8".allowedTCPPorts = [ 179 ];
|
||||
networking.firewall.interfaces."wg-mic-der".allowedTCPPorts = [ 179 ];
|
||||
# Traffic can return on the leg that is not the current best route.
|
||||
# Strict reverse-path filtering drops that; loose keeps the spoof check.
|
||||
networking.firewall.interfaces."wg-mic-bd8".allowedTCPPorts = [ 179 ];
|
||||
# Two legs means replies can arrive on the leg that is not the best route
|
||||
# back. Strict reverse-path filtering drops those; loose keeps the spoof
|
||||
# check (a route must exist) without caring which leg it points at.
|
||||
networking.firewall.checkReversePath = lib.mkDefault "loose";
|
||||
|
||||
networking.networkmanager.unmanaged =
|
||||
|
|
@ -213,55 +114,33 @@ in {
|
|||
ip prefix-list OWN-V4 seq 5 permit ${id4}/32
|
||||
ipv6 prefix-list OWN-V6 seq 5 permit ${id6}/128
|
||||
!
|
||||
! Accept the default the mesh hands us, plus mesh space. Nothing else:
|
||||
! public prefixes are the far end's business (it does the RU/intl
|
||||
! split), and the mesh carries anycast /32s for public services that
|
||||
! must not be installed here.
|
||||
ip prefix-list MESH-V4 seq 1 permit 0.0.0.0/0
|
||||
! Preserve Heather's narrower accepted mesh space (not YC 10.130/24).
|
||||
! Accept mesh space only: never a default, never public prefixes. The
|
||||
! mesh carries anycast /32s for public services (DNS resolvers etc.);
|
||||
! accepting those would steer this host's own traffic into AstrNet.
|
||||
! It also keeps the tunnel endpoints themselves out of the tunnels.
|
||||
! Narrow to AstrNet address space; do not accept Yandex Cloud 10.130/24.
|
||||
ip prefix-list MESH-V4 seq 5 permit 10.0.0.0/24 ge 24 le 32
|
||||
ip prefix-list MESH-V4 seq 10 permit 10.0.1.0/24 ge 24 le 32
|
||||
ip prefix-list MESH-V4 seq 15 permit 10.0.2.0/24 ge 24 le 32
|
||||
ip prefix-list MESH-V4 seq 20 permit 10.99.0.0/22 ge 22 le 32
|
||||
ipv6 prefix-list MESH-V6 seq 1 permit ::/0
|
||||
ipv6 prefix-list MESH-V6 seq 5 permit 2a05:f480:2400:1cf7::/64 le 128
|
||||
ipv6 prefix-list MESH-V6 seq 10 permit fd53:4023:2326::/48 le 128
|
||||
!
|
||||
! bd8816 is primary (same city): higher local-preference inbound...
|
||||
route-map IN-BD8-V4 permit 10
|
||||
match ip address prefix-list MESH-V4
|
||||
set local-preference 200
|
||||
exit
|
||||
route-map IN-BD8-V6 permit 10
|
||||
match ipv6 address prefix-list MESH-V6
|
||||
set local-preference 200
|
||||
exit
|
||||
route-map IN-DER-V4 permit 10
|
||||
route-map MESH-IN-V4 permit 10
|
||||
match ip address prefix-list MESH-V4
|
||||
exit
|
||||
route-map IN-DER-V6 permit 10
|
||||
route-map MESH-IN-V6 permit 10
|
||||
match ipv6 address prefix-list MESH-V6
|
||||
exit
|
||||
!
|
||||
! ...and a longer path via alderamin outbound, so replies from the rest
|
||||
! of the mesh come back through bd8816 too.
|
||||
route-map OUT-BD8-V4 permit 10
|
||||
route-map MESH-OUT-V4 permit 10
|
||||
match ip address prefix-list OWN-V4
|
||||
exit
|
||||
route-map OUT-BD8-V6 permit 10
|
||||
route-map MESH-OUT-V6 permit 10
|
||||
match ipv6 address prefix-list OWN-V6
|
||||
exit
|
||||
route-map OUT-DER-V4 permit 10
|
||||
match ip address prefix-list OWN-V4
|
||||
set as-path prepend 4200000009 4200000009
|
||||
exit
|
||||
route-map OUT-DER-V6 permit 10
|
||||
match ipv6 address prefix-list OWN-V6
|
||||
set as-path prepend 4200000009 4200000009
|
||||
exit
|
||||
!
|
||||
! Source everything routed via BGP (the mesh default included) from the
|
||||
! identity; the exits NAT that address.
|
||||
! Source mesh traffic from the identity, not from whichever tunnel /30
|
||||
! it leaves by; otherwise replies break whenever the path changes.
|
||||
route-map SET-MESH-SRC permit 10
|
||||
set src ${id4}
|
||||
exit
|
||||
|
|
@ -275,39 +154,40 @@ in {
|
|||
bgp router-id ${id4}
|
||||
no bgp ebgp-requires-policy
|
||||
no bgp default ipv4-unicast
|
||||
neighbor 10.99.0.157 remote-as 4200000005
|
||||
neighbor 10.99.0.157 description bd8816-v4-wg-mic-bd8
|
||||
neighbor 10.99.0.157 update-source 10.99.0.158
|
||||
bgp bestpath as-path multipath-relax
|
||||
neighbor 10.99.0.153 remote-as 4200000012
|
||||
neighbor 10.99.0.153 description alderamin-v4-wg-mic-der
|
||||
neighbor 10.99.0.153 update-source 10.99.0.154
|
||||
neighbor fd53:4023:2326:99::9d remote-as 4200000005
|
||||
neighbor fd53:4023:2326:99::9d description bd8816-v6-wg-mic-bd8
|
||||
neighbor fd53:4023:2326:99::9d interface wg-mic-bd8
|
||||
neighbor fd53:4023:2326:99::9d update-source fd53:4023:2326:99::9e
|
||||
neighbor 10.99.0.157 remote-as 4200000005
|
||||
neighbor 10.99.0.157 description bd8816-v4-wg-mic-bd8
|
||||
neighbor 10.99.0.157 update-source 10.99.0.158
|
||||
neighbor fd53:4023:2326:99::99 remote-as 4200000012
|
||||
neighbor fd53:4023:2326:99::99 description alderamin-v6-wg-mic-der
|
||||
neighbor fd53:4023:2326:99::99 interface wg-mic-der
|
||||
neighbor fd53:4023:2326:99::99 update-source fd53:4023:2326:99::9a
|
||||
neighbor fd53:4023:2326:99::9d remote-as 4200000005
|
||||
neighbor fd53:4023:2326:99::9d description bd8816-v6-wg-mic-bd8
|
||||
neighbor fd53:4023:2326:99::9d interface wg-mic-bd8
|
||||
neighbor fd53:4023:2326:99::9d update-source fd53:4023:2326:99::9e
|
||||
!
|
||||
address-family ipv4 unicast
|
||||
network ${id4}/32
|
||||
neighbor 10.99.0.157 activate
|
||||
neighbor 10.99.0.157 route-map IN-BD8-V4 in
|
||||
neighbor 10.99.0.157 route-map OUT-BD8-V4 out
|
||||
neighbor 10.99.0.153 activate
|
||||
neighbor 10.99.0.153 route-map IN-DER-V4 in
|
||||
neighbor 10.99.0.153 route-map OUT-DER-V4 out
|
||||
neighbor 10.99.0.153 route-map MESH-IN-V4 in
|
||||
neighbor 10.99.0.153 route-map MESH-OUT-V4 out
|
||||
neighbor 10.99.0.157 activate
|
||||
neighbor 10.99.0.157 route-map MESH-IN-V4 in
|
||||
neighbor 10.99.0.157 route-map MESH-OUT-V4 out
|
||||
exit-address-family
|
||||
!
|
||||
address-family ipv6 unicast
|
||||
network ${id6}/128
|
||||
neighbor fd53:4023:2326:99::9d activate
|
||||
neighbor fd53:4023:2326:99::9d route-map IN-BD8-V6 in
|
||||
neighbor fd53:4023:2326:99::9d route-map OUT-BD8-V6 out
|
||||
neighbor fd53:4023:2326:99::99 activate
|
||||
neighbor fd53:4023:2326:99::99 route-map IN-DER-V6 in
|
||||
neighbor fd53:4023:2326:99::99 route-map OUT-DER-V6 out
|
||||
neighbor fd53:4023:2326:99::99 route-map MESH-IN-V6 in
|
||||
neighbor fd53:4023:2326:99::99 route-map MESH-OUT-V6 out
|
||||
neighbor fd53:4023:2326:99::9d activate
|
||||
neighbor fd53:4023:2326:99::9d route-map MESH-IN-V6 in
|
||||
neighbor fd53:4023:2326:99::9d route-map MESH-OUT-V6 out
|
||||
exit-address-family
|
||||
exit
|
||||
'';
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue