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Author SHA1 Message Date
Alarig Le Lay 7dc53046f8
Exit with error if the BGP community AS translation isn’t found
Signed-off-by: Alarig Le Lay <alelay@scaleway.com>
2024-10-17 15:28:46 +02:00
Alarig Le Lay 0070ef25c4
First code sync
Signed-off-by: Alarig Le Lay <alelay@scaleway.com>
2024-10-17 15:28:02 +02:00
Alarig Le Lay 9e9ad27fff
bird example config
Signed-off-by: Alarig Le Lay <alelay@scaleway.com>
2024-10-17 15:26:37 +02:00
Alarig Le Lay 63123b3d66
README formating
Signed-off-by: Alarig Le Lay <alelay@scaleway.com>
2024-10-17 15:25:24 +02:00
5 changed files with 531 additions and 5 deletions

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# What the scripts are used for
`/usr/local/sbin/update-irr-filters.sh` Has to be put in a cron
`/usr/local/sbin/update-check-import.sh` Is used to do generate the stuff common to all peers
`/usr/local/sbin/generate-irr-filter.sh` Is used to generate each peer configuration
* `/usr/local/sbin/update-irr-filters.sh` has to be put in a cron
* `/usr/local/sbin/update-check-import.sh` is used to do generate the stuff
common to all peers
* `/usr/local/sbin/generate-irr-filter.sh` is used to generate each peer
configuration
# Configuration files
`/usr/local/etc/bird-peers-update.conf` is sourced for three variables:
* `PDB_API_KEY` which will be used to query the peeringdb api
* `BIRD_CONF_PATH` for the base dir of bird (freebsd and linux have different ones)
* `BIRD_CONF_PATH` for the base dir of bird (freebsd and linux have
different ones)
* `IXP_ASN` the ixp asn for the communities
# Override some peers configuration
If you want to add some configuration for some particular peers, you can do it like that:
If you want to add some configuration for some particular peers, you can do it
like that:
```
root@lillix-rs2:~# cat /usr/local/etc/bird-override/bgp_208627_ALARIG_193_34_197_135.conf
bfd on;

208
bird.conf Normal file
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# Configure logging
#log syslog { warning, error, fatal, bug };
log syslog all;
# Turn on global debugging of all protocols
#debug protocols all;
debug protocols { states };
# Override router ID and store ASN
router id 193.34.197.192;
define myasn = 47214;
#####################
# GENERAL PROTOCOLS #
#####################
# This pseudo-protocol watches all interface up/down events.
protocol device {
# Scan interfaces every 5 seconds
scan time 5;
}
protocol bfd {
interface "ens19" {
passive on;
};
}
roa4 table r4;
roa6 table r6;
protocol rpki rpki_alarig {
remote "msi.no.swordarmor.fr";
roa4 { table r4; };
roa6 { table r6; };
}
protocol rpki rpki_cf {
remote "rtr.rpki.cloudflare.com";
port 8282;
roa4 { table r4; };
roa6 { table r6; };
}
###############
# BGP FILTERS #
###############
include "/etc/bird/check_import.conf";
function check_ipv4(int peeras; ip nexthop)
prefix set martians;
prefix set our_prefixes;
{
check_import(peeras, nexthop);
martians = [
10.0.0.0/8+, 100.64.0.0/10+, 127.0.0.0/8+, 169.254.0.0/16+,
172.16.0.0/12+, 192.0.0.0/24+, 192.0.2.0/24+, 192.168.0.0/16+,
198.18.0.0/15+, 198.51.100.0/24+, 203.0.113.0/24+,
224.0.0.0/4+, 240.0.0.0/4+, 255.255.255.255/32
];
# Avoid reserved networks
if net ~ martians then return false;
# Avoid too short and too long prefixes
if (net.len < 8) || (net.len > 24) then return false;
# Avoid 0.0.0.0/X (default route + 0.0.0.0/8)
if net.ip = 0.0.0.0 then return false;
# Remove our prefixes. Only us can announce them
# Remove also our interconnection prefixes. We are directly connected.
if net ~ [ 185.1.89.0/24+ ] then return false;
# scrub Origin Validation State Extended Community
bgp_ext_community.delete((unknown 0x4300, 0, 0));
bgp_ext_community.delete((unknown 0x4300, 0, 1));
bgp_ext_community.delete((unknown 0x4300, 0, 2));
# set RPKI Origin Validation State Extended Community
case roa_check(r4, net, bgp_path.last_nonaggregated) {
ROA_VALID:
# add rfc8097 marker to routes for which a valid
# matching ROA exists
bgp_ext_community.add((unknown 0x4300, 0, 0));
ROA_INVALID:
bgp_ext_community.add((unknown 0x4300, 0, 2));
return false;
else:
# add rfc8097 marker to routes for which no covering
# ROA exists
bgp_ext_community.add((unknown 0x4300, 0, 1));
}
return true;
};
function check_ipv6(int peeras; ip nexthop)
prefix set martians;
prefix set our_prefixes;
{
check_import(peeras, nexthop);
martians = [ ::1/128, ::/128, ::ffff:0:0/96+, 100::/64+,
2001:db8::/32+, 2001::/23, 2001:2::/48+, 2001:10::/28+, 2002::/17+,
fc00::/7, fe80::/10, ff00::/8+, 3FFE::/16+, 5F00::/8+
];
# Avoid reserved networks
if net ~ martians then return false;
# Avoid too short and too long prefixes
if (net.len < 16) || (net.len > 48) then return false;
# Avoid bogons. IANA didn't allocate outside of 2000::/3
# but there are already announces there
if ! (net.ip ~ 2000::/3) then return false;
# Avoid 0.0.0.0/X (default route + 0.0.0.0/8)
if net.ip = ::/0 then return false;
# Remove our prefixes. Only us can announce them
# Remove also our interconnection prefixes. We are directly connected.
if net ~ 2001:7f8:b1::/48 then return false;
# scrub Origin Validation State Extended Community
bgp_ext_community.delete((unknown 0x4300, 0, 0));
bgp_ext_community.delete((unknown 0x4300, 0, 1));
bgp_ext_community.delete((unknown 0x4300, 0, 2));
# set RPKI Origin Validation State Extended Community
case roa_check(r6, net, bgp_path.last_nonaggregated) {
ROA_VALID:
# add rfc8097 marker to routes for which a valid
# matching ROA exists
bgp_ext_community.add((unknown 0x4300, 0, 0));
ROA_INVALID:
bgp_ext_community.add((unknown 0x4300, 0, 2));
return false;
else:
# add rfc8097 marker to routes for which no covering
# ROA exists
bgp_ext_community.add((unknown 0x4300, 0, 1));
}
return true;
};
#############
# Templates #
#############
template bgp PEERS_IPv4 {
local as myasn;
rs client;
passive;
local role rs_server;
#bfd on;
prefer older;
ipv4 {
import table on;
export table on;
rpki reload;
add paths tx;
import keep filtered;
import all;
export all;
import limit 100 action block;
receive limit 1000 action disable;
};
}
template bgp PEERS_IPv6 {
local as myasn;
rs client;
passive;
local role rs_server;
#bfd on;
prefer older;
ipv6 {
import table on;
export table on;
rpki reload;
add paths tx;
import keep filtered;
import all;
export all;
import limit 100 action block;
receive limit 1000 action disable;
};
}
#########
# PEERS #
#########
include "/etc/bird/google.conf";
include "/etc/bird/functions/*.conf";
include "/etc/bird/peers/*.conf";

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generate-irr-filter.sh Executable file
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#!/bin/sh
set -e
# for iconv below
export LC_ALL=en_US.utf8
# 1st argument must be an ASN registered to peeringdb
# 2nd argument must be the IPv4 peering address
# 3rd argument must be the IPv6 peering address
if [ ! -f /usr/local/etc/bird-peers-update.conf ]; then
printf "Write /usr/local/etc/bird-peers-update.conf with at least "
printf "PDB_API_KEY, IXP_ASN and BIRD_CONF_PATH vars\n"
exit 1
else
. /usr/local/etc/bird-peers-update.conf
fi
PEER_AS=$1
IPv4=$2
IPv6=$3
if [ -z "${PEER_AS}" -o -z "${IPv4}" -o -z "${IPv6}" ]; then
echo "1st argument must be an ASN registered to peeringdb"
echo "2nd argument must be the IPv4 peering address"
echo "3rd argument must be the IPv6 peering address"
exit 1
fi
CACHE_DIR=/var/local/cache/peeringdb
if [ ! -d "${CACHE_DIR}" ]; then
mkdir -p "${CACHE_DIR}"
fi
# re-fetch data if it's too old
if [ -z "$(find ${CACHE_DIR} -mmin -720 -name ${PEER_AS}.json)" ]; then
curl -s -H 'Authorization: Api-Key '"${PDB_API_KEY}" \
-X GET "https://www.peeringdb.com/api/net?asn=${PEER_AS}" \
> "${CACHE_DIR}/${PEER_AS}.json"
fi
# test if the data is valid, -e will exit the script
jq -r '.data[] | .irr_as_set' "${CACHE_DIR}/${PEER_AS}.json" 1>/dev/null
IRRASSET=$(jq -r '.data[] | .irr_as_set' "${CACHE_DIR}/${PEER_AS}.json")
MAXPREF4=$(jq -r '.data[] | .info_prefixes4' "${CACHE_DIR}/${PEER_AS}.json")
MAXPREF6=$(jq -r '.data[] | .info_prefixes6' "${CACHE_DIR}/${PEER_AS}.json")
AS_NAME=$(jq -r '.data[] | .name' "${CACHE_DIR}/${PEER_AS}.json")
if [ -z "${IRRASSET}" ]; then
IRRASSET="AS${PEER_AS}"
fi
# Remove diacritic first as potential question marks will remove afterward
AS_NAME="$(echo ${AS_NAME} | iconv -f utf-8 -t ascii//TRANSLIT)"
AS_NAME="$(echo ${AS_NAME} | tr '[:punct:]' '_')"
AS_NAME="$(echo ${AS_NAME} | tr '[:space:]' '_')"
AS_NAME="$(echo ${AS_NAME} | tr '[:lower:]' '[:upper:]')"
AS_NAME="$(echo ${AS_NAME} | sed -E 's/^_+//;s/_+$//;s/_+/_/g')"
IPv4_PFL="$(bgpq4 -4 -b -A -l AS${PEER_AS}_v4 -R 24 ${IRRASSET})"
IPv6_PFL="$(bgpq4 -6 -b -A -l AS${PEER_AS}_v6 -R 48 ${IRRASSET})"
if [ -z "${MAXPREF4}" ] || [ ${MAXPREF4} -eq 0 ]; then
MAXPREF4=$(echo "${IPv4_PFL}" | wc -l)
fi
if [ "${MAXPREF4}" -lt 10 ]; then
MAXPREF4=10
fi
if [ -z "${MAXPREF6}" ] || [ ${MAXPREF6} -eq 0 ]; then
MAXPREF6=$(echo "${IPv6_PFL}" | wc -l)
fi
if [ "${MAXPREF6}" -lt 10 ]; then
MAXPREF6=10
fi
# do we really trust peeringdb? we may want to limit maxpref
mkdir -p "${BIRD_CONF_PATH}"/functions
# AS16 - AS32 from whois AS47214
if [ "${PEER_AS}" -gt 65535 ]; then
# la t'es bien
eval $(whois AS47214 | awk '/AS32 to AS16/ { print "AS"$5"="$7";" }' | sed -E 's/AS([0-9]+)/\1/g')
if [ -n "${PEER_AS}" ]; then
eval COMMU_PEER_AS=\$AS${PEER_AS}
else
echo "AS16 - AS32 from whois AS${IXP_ASN} not found"
exit 1
fi
else
COMMU_PEER_AS=${PEER_AS}
fi
echo "# generated by $0 $@
function check_import_${PEER_AS}_ipv4(int peeras; ip nexthop)
prefix set AS${PEER_AS}_v4;
{
${IPv4_PFL}
# check if the announced prefix is in the bgpq set
if net !~ AS${PEER_AS}_v4 then return false;
# reject the route if the first as is not the peer
# or if the nexthop is not the peer as well
# we also check the rpki status there
return check_ipv4(peeras, nexthop);
}
filter bgp_filters_${PEER_AS}_out {
if ! (source = RTS_BGP) then reject;
if (${IXP_ASN},${COMMU_PEER_AS}) ~ bgp_community then accept;
if (0,${COMMU_PEER_AS}) ~ bgp_community then reject;
if (0,${IXP_ASN}) ~ bgp_community then reject;
if (${IXP_ASN},${IXP_ASN}) ~ bgp_community then accept;
else accept;
}
" > "${BIRD_CONF_PATH}/functions/${PEER_AS}_v4.conf"
mkdir -p "${BIRD_CONF_PATH}"/peers
# bird does not support dots in the filters name, it must be dashes
DASH_IPv4="$(echo ${IPv4} | tr '.' '_')"
if [ -f "/usr/local/etc/bird-override/bgp_${PEER_AS}_${AS_NAME}_${DASH_IPv4}.conf" ]; then
BIRD_OVERRIDE_AFI_V4="include \"/usr/local/etc/bird-override/bgp_${PEER_AS}_${AS_NAME}_${DASH_IPv4}.conf\";"
else
BIRD_OVERRIDE_AFI_V4=""
fi
echo "# generated by $0 $@
filter bgp_filters_${DASH_IPv4}_in_ipv4 {
if (check_import_${PEER_AS}_ipv4(${PEER_AS}, ${IPv4})) then {
# Here we can set localpref or remove a prefix, for example
accept;
}
else {
reject \"Prefix \", net, \" filtered IN from ${IPv4}\";
}
}
protocol bgp bgp_${PEER_AS}_${AS_NAME}_${DASH_IPv4} from PEERS_IPv4 {
description \"${AS_NAME} ${IRRASSET}\";
neighbor ${IPv4} as ${PEER_AS};
${BIRD_OVERRIDE_AFI_V4}
ipv4 {
receive limit ${MAXPREF4} action restart;
import limit ${MAXPREF4} action disable;
import filter bgp_filters_${DASH_IPv4}_in_ipv4;
export filter bgp_filters_${PEER_AS}_out;
};
}
" > "${BIRD_CONF_PATH}/peers/${PEER_AS}_${IPv4}.conf"
echo "# generated by $0 $@
function check_import_${PEER_AS}_ipv6(int peeras; ip nexthop)
prefix set AS${PEER_AS}_v6;
{
${IPv6_PFL}
# check if the announced prefix is in the bgpq set
if net !~ AS${PEER_AS}_v6 then return false;
# reject the route if the first as is not the peer
# or if the nexthop is not the peer as well
# we also check the rpki status there
return check_ipv6(peeras, nexthop);
}
" > "${BIRD_CONF_PATH}/functions/${PEER_AS}_v6.conf"
# bird does not support semicollons in the filters name, it must be dashes
DASH_IPv6="$(echo ${IPv6} | tr ':' '_')"
if [ -f "/usr/local/etc/bird-override/bgp_${PEER_AS}_${AS_NAME}_${DASH_IPv6}.conf" ]; then
BIRD_OVERRIDE_AFI_V6="include \"/usr/local/etc/bird-override/bgp_${PEER_AS}_${AS_NAME}_${DASH_IPv6}.conf\";"
else
BIRD_OVERRIDE_AFI_V6=""
fi
echo "# generated by $0 $@
filter bgp_filters_${DASH_IPv6}_in_ipv6 {
if (check_import_${PEER_AS}_ipv6(${PEER_AS}, ${IPv6})) then {
# Here we can set localpref or remove a prefix, for example
accept;
}
else {
reject \"Prefix \", net, \" filtered IN from ${IPv6}\";
}
}
protocol bgp bgp_${PEER_AS}_${AS_NAME}_${DASH_IPv6} from PEERS_IPv6 {
description \"${AS_NAME} ${IRRASSET}\";
neighbor ${IPv6} as ${PEER_AS};
${BIRD_OVERRIDE_AFI_V6}
ipv6 {
receive limit ${MAXPREF6} action restart;
import limit ${MAXPREF6} action disable;
import filter bgp_filters_${DASH_IPv6}_in_ipv6;
export filter bgp_filters_${PEER_AS}_out;
};
}
" > "${BIRD_CONF_PATH}/peers/${PEER_AS}_${IPv6}.conf"
echo "# generated by $0 $@
function check_import_${PEER_AS}_ipv6(int peeras; ip nexthop)
prefix set AS${PEER_AS}_v6;
{
${IPv6_PFL}
if net !~ AS${PEER_AS}_v6 then return false;
return check_ipv6(peeras, nexthop);
}
" > "${BIRD_CONF_PATH}/functions/${PEER_AS}_v6.conf"

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update-check-import.sh Executable file
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#!/bin/sh
set -e
if [ ! -f /usr/local/etc/bird-peers-update.conf ]; then
printf "Write /usr/local/etc/bird-peers-update.conf with at least "
printf "PDB_API_KEY and BIRD_CONF_PATH vars\n"
exit 1
else
. /usr/local/etc/bird-peers-update.conf
fi
# comma list
NEVER_VIA_RS_LIST="$(
curl -H 'Authorization: Api-Key '"${PDB_API_KEY}" \
-s 'https://www.peeringdb.com/api/net?info_never_via_route_servers=1' | \
jq '.data[].asn' | sort -n | tr '\n' ',' | sed 's/,/, /g;s/, $//'
)"
# bird set
NEVER_VIA_RS_SET="$(
printf "[ ${NEVER_VIA_RS_LIST} ]"
)"
if [ -n "${NEVER_VIA_RS_SET}" ]; then
printf "# generated by $0 $@
function check_import(int peeras; ip nexthop)
int set reserved_asn;
int set never_via_rs;
{
reserved_asn = [ 0, 64297..131071, 4200000000..4294967294, 4294967295 ];
never_via_rs = ${NEVER_VIA_RS_SET};
# Check that the next AS is our neighbour's.
# Same for next-hop
if bgp_path.first != peeras then return false;
if bgp_next_hop != nexthop then return false;
# AS_PATH too long (8 because a member could re-annonce its clients, and
# the clients of it clients, and prepend on the IXP)
if bgp_path.len > 8 then return false;
# Don't accept if path contains a reserved AS
# Disabled because it removes legit prefixes
if bgp_path ~ reserved_asn then return false;
if bgp_path ~ never_via_rs then return false;
return true;
}
" > "${BIRD_CONF_PATH}"/check_import.conf
fi

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update-irr-filters.sh Executable file
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#!/bin/sh
# Update the 'never on rs' from peeringdb
/usr/local/sbin/update-check-import.sh
# Genereate the filters and peers using data from peeringdb
/usr/local/sbin/generate-irr-filter.sh 16347 193.34.197.130 2001:7f8:6d::1:6347:1
#/usr/local/sbin/generate-irr-filter.sh 200780 193.34.197.148 2001:7f8:6d::20:0780:1 # Appliwave a degage
/usr/local/sbin/generate-irr-filter.sh 199917 193.34.197.157 2001:7f8:6d::19:9917:1
/usr/local/sbin/generate-irr-filter.sh 209823 193.34.197.145 2001:7f8:6d::20:9823:1
/usr/local/sbin/generate-irr-filter.sh 35625 193.34.197.129 2001:7f8:6d::3:5625:1
#/usr/local/sbin/generate-irr-filter.sh 30781 193.34.197.154 2001:7f8:6d::3:0781:1 # FreePro pas sur les RS
/usr/local/sbin/generate-irr-filter.sh 35360 193.34.197.144 2001:7f8:6d::3:5360:1
/usr/local/sbin/generate-irr-filter.sh 34019 193.34.197.156 2001:7f8:6d::3:4019:1
/usr/local/sbin/generate-irr-filter.sh 29075 193.34.197.140 2001:7f8:6d::2:9075:1
/usr/local/sbin/generate-irr-filter.sh 25091 193.34.197.153 2001:7f8:6d::2:5091:1
/usr/local/sbin/generate-irr-filter.sh 8298 193.34.197.143 2001:7f8:6d::8298:1
/usr/local/sbin/generate-irr-filter.sh 2027 193.34.197.151 2001:7f8:6d::2027:1
/usr/local/sbin/generate-irr-filter.sh 9036 193.34.197.132 2001:7f8:6d::1:9036:1
/usr/local/sbin/generate-irr-filter.sh 199758 193.34.197.146 2001:7f8:6d::19:9758:1
/usr/local/sbin/generate-irr-filter.sh 16276 193.34.197.142 2001:7f8:6d::1:6276:1
/usr/local/sbin/generate-irr-filter.sh 2200 193.34.197.158 2001:7f8:6d::2200:1
/usr/local/sbin/generate-irr-filter.sh 62119 193.34.197.162 2001:7f8:6d::6:2119:1
/usr/local/sbin/generate-irr-filter.sh 206002 193.34.197.163 2001:7f8:6d::20:6002:1
/usr/local/sbin/generate-irr-filter.sh 31235 193.34.197.133 2001:7f8:6d::3:1235:1
/usr/local/sbin/generate-irr-filter.sh 210879 193.34.197.161 2001:7f8:6d::21:0879:1
/usr/local/sbin/generate-irr-filter.sh 197922 193.34.197.131 2001:7f8:6d::19:7922:1
/usr/local/sbin/generate-irr-filter.sh 210165 193.34.197.152 2001:7f8:6d::21:165:1
/usr/local/sbin/generate-irr-filter.sh 35661 193.34.197.155 2001:7f8:6d::3:5661:1
/usr/local/sbin/generate-irr-filter.sh 8218 193.34.197.141 2001:7f8:6d::8218:1
/usr/local/sbin/generate-irr-filter.sh 6461 193.34.197.149 2001:7f8:6d::6461:1
/usr/local/sbin/generate-irr-filter.sh 44097 193.34.197.134 2001:7f8:6d::4:4097:1
/usr/local/sbin/generate-irr-filter.sh 208627 193.34.197.135 2001:7f8:6d::20:8627:1
/usr/local/sbin/generate-irr-filter.sh 207910 193.34.197.136 2001:7f8:6d::20:7910:1
/usr/local/sbin/generate-irr-filter.sh 205068 193.34.197.137 2001:7f8:6d::20:5068:1
# Check if the config is valid and reload
STATUS=$(birdc configure | grep -v BIRD)
if [ -z "$(echo ${STATUS} | grep 'Reconfigured')" ]; then
echo ${STATUS}
fi