Rename BGP peers, introduce BGP communities

bird.conf

@@ -4,7 +4,7 @@ protocol device {
 
 protocol static {
 	route 172.20.0.0/14 via 172.20.170.192;
-	route 172.20.170.192/28 reject;
+	route 172.20.170.192/27 reject;
 	import all;
 	export none;
 }
@@ -14,7 +14,8 @@ include "/etc/bird/local4.conf";
 # filter helpers
 #################
 
-##include "/etc/bird/filter4.conf";
+#include "/etc/bird/filter4.conf";
+include "/etc/bird/community_filters.conf";
 
 protocol kernel {
 	scan time 20;

bird6.conf

@@ -10,7 +10,8 @@ include "/etc/bird/local6.conf";
 # filter helpers
 #################
 
-##include "/etc/bird/filter6.conf";
+#include "/etc/bird/filter6.conf";
+include "/etc/bird/community_filters.conf";
 
 protocol kernel {
 	metric 64;	# Use explicit kernel route metric to avoid collisions

community_filters.conf

@@ -0,0 +1,67 @@
+#/etc/bird/community_filters.conf
+function update_latency(int link_latency) {
+  bgp_community.add((64511, link_latency));
+       if (64511, 9) ~ bgp_community then { bgp_community.delete([(64511, 1..8)]); return 9; }
+  else if (64511, 8) ~ bgp_community then { bgp_community.delete([(64511, 1..7)]); return 8; }
+  else if (64511, 7) ~ bgp_community then { bgp_community.delete([(64511, 1..6)]); return 7; }
+  else if (64511, 6) ~ bgp_community then { bgp_community.delete([(64511, 1..5)]); return 6; }
+  else if (64511, 5) ~ bgp_community then { bgp_community.delete([(64511, 1..4)]); return 5; }
+  else if (64511, 4) ~ bgp_community then { bgp_community.delete([(64511, 1..3)]); return 4; }
+  else if (64511, 3) ~ bgp_community then { bgp_community.delete([(64511, 1..2)]); return 3; }
+  else if (64511, 2) ~ bgp_community then { bgp_community.delete([(64511, 1..1)]); return 2; }
+  else return 1;
+}
+
+function update_bandwidth(int link_bandwidth) {
+  bgp_community.add((64511, link_bandwidth));
+       if (64511, 21) ~ bgp_community then { bgp_community.delete([(64511, 22..29)]); return 21; }
+  else if (64511, 22) ~ bgp_community then { bgp_community.delete([(64511, 23..29)]); return 22; }
+  else if (64511, 23) ~ bgp_community then { bgp_community.delete([(64511, 24..29)]); return 23; }
+  else if (64511, 24) ~ bgp_community then { bgp_community.delete([(64511, 25..29)]); return 24; }
+  else if (64511, 25) ~ bgp_community then { bgp_community.delete([(64511, 26..29)]); return 25; }
+  else if (64511, 26) ~ bgp_community then { bgp_community.delete([(64511, 27..29)]); return 26; }
+  else if (64511, 27) ~ bgp_community then { bgp_community.delete([(64511, 28..29)]); return 27; }
+  else if (64511, 28) ~ bgp_community then { bgp_community.delete([(64511, 29..29)]); return 28; }
+  else return 29;
+}
+
+function update_crypto(int link_crypto) {
+  bgp_community.add((64511, link_crypto));
+       if (64511, 31) ~ bgp_community then { bgp_community.delete([(64511, 32..34)]); return 31; }
+  else if (64511, 32) ~ bgp_community then { bgp_community.delete([(64511, 33..34)]); return 32; }
+  else if (64511, 33) ~ bgp_community then { bgp_community.delete([(64511, 34..34)]); return 33; }
+  else return 34;
+}
+	
+function update_flags(int link_latency; int link_bandwidth; int link_crypto)
+int dn42_latency;
+int dn42_bandwidth;
+int dn42_crypto;
+{
+  dn42_latency = update_latency(link_latency);
+  dn42_bandwidth = update_bandwidth(link_bandwidth) - 20;
+  dn42_crypto = update_crypto(link_crypto) - 30;
+  # replace 4 with your calculated bandwidth value
+  if dn42_bandwidth > 4 then dn42_bandwidth = 4;
+  return true;
+}
+
+# Combines filter from local4.conf/local6.conf and filter4.conf/filter6.conf,
+# which means, these must included before this file
+
+function dn42_import_filter(int link_latency; int link_bandwidth; int link_crypto) {
+  if is_valid_network() && !is_self_net() then {
+    update_flags(link_latency, link_bandwidth, link_crypto);
+    accept;
+  }
+  reject;
+}
+
+function dn42_export_filter(int link_latency; int link_bandwith; int link_crypto) {
+  if is_valid_network() then {
+    if source = RTS_STATIC then bgp_community.add((64511, DN42_REGION));
+    update_flags(link_latency, link_bandwith, link_crypto);
+    accept;
+  }
+  reject;
+}

local4.conf

@@ -2,6 +2,7 @@ router id 172.20.170.192;
 
 define OWNAS =  4242423934;
 define OWNIP = 172.20.170.192;
+define DN42_REGION = 41;
 
 function is_self_net() {
   return net ~ [172.20.170.192/27+];

local6.conf

@@ -2,6 +2,7 @@ router id 172.20.170.192;
 
 define OWNAS = 4242423934;
 define OWNIP = fd62:77fb:94bf::;
+define DN42_REGION = 41;
 
 function is_self_net() {
   return net ~ [fd62:77fb:94bf::/48+];

peers4/B_dn42_Yamakaja

@@ -0,0 +1,5 @@
+protocol bgp B_dn42_Yamakaja from dnpeers {
+	neighbor 172.20.20.64 as 4242421191;
+	import where dn42_import_filter(2,24,34);
+	export where dn42_export_filter(2,24,34);
+};

peers4/B_dn42_filip

@@ -1,3 +1,3 @@
-protocol bgp filip from dnpeers {
+protocol bgp B_dn42_filip from dnpeers {
 	neighbor 172.20.178.65 as 4242421404;
 };

peers4/Yamakaja

@@ -1,3 +0,0 @@
-protocol bgp Yamakaja from dnpeers {
-	neighbor 172.20.20.64 as 4242421191;
-};

peers6/B_dn42_Yamakaja

@@ -1,3 +1,3 @@
-protocol bgp Yamakaja from dnpeers {
+protocol bgp B_dn42_Yamakaja from dnpeers {
 	neighbor fe80::1191 % 'wg-bgp-Yamakaja' as 4242421191;
 };

peers6/B_dn42_filip

@@ -1,3 +1,3 @@
-protocol bgp filip from dnpeers {
+protocol bgp B_dn42_filip from dnpeers {
 	neighbor fe80::feec:daff:fe46:d60e % 'wg-bgp-filip' as 4242421404;
 };