blob: dd153ab478ac7655a1a306b6e0ba21a3188b0982 [file] [log] [blame]
#!/bin/bash
# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
[[ -n ${gbmc_br_gw_src_lib-} ]] && return
# shellcheck source=meta-google/recipes-google/networking/network-sh/lib.sh
source /usr/share/network/lib.sh || exit
gbmc_br_gw_src_ip_stateful=
gbmc_br_gw_src_ip_stateless=
declare -A gbmc_br_gw_src_routes=()
gbmc_br_gw_defgw=
gbmc_br_set_router() {
local defgw=
local route
for route in "${!gbmc_br_gw_src_routes[@]}"; do
if [[ $route != *' dev gbmcbr '* ]]; then
defgw=1
break
fi
done
[[ $defgw == "$gbmc_br_gw_defgw" ]] && return
gbmc_br_gw_defgw="$defgw"
local files=(/run/systemd/network/{00,}-bmc-gbmcbr.network.d/50-defgw.conf)
if [[ -n $defgw ]]; then
local file
for file in "${files[@]}"; do
mkdir -p "$(dirname "$file")"
printf '[IPv6PrefixDelegation]\nRouterLifetimeSec=30\n' >"$file"
done
else
rm -f "${files[@]}"
fi
if [[ $(systemctl is-active systemd-networkd) != inactive ]]; then
networkctl reload && networkctl reconfigure gbmcbr
fi
}
gbmc_br_gw_src_update() {
local gbmc_br_gw_src_ip="${gbmc_br_gw_src_ip_stateful:-$gbmc_br_gw_src_ip_stateless}"
[[ -n $gbmc_br_gw_src_ip ]] || return
local route
for route in "${!gbmc_br_gw_src_routes[@]}"; do
[[ $route != *" src $gbmc_br_gw_src_ip "* ]] || continue
echo "gBMC Bridge Updating GW source [$gbmc_br_gw_src_ip]: $route" >&2
# shellcheck disable=SC2086
ip route change $route src "$gbmc_br_gw_src_ip" && \
unset 'gbmc_br_gw_src_routes[$route]'
done
}
gbmc_br_gw_src_hook() {
# We only want to match default gateway routes that are dynamic
# (have an expiration time). These will be updated with our preferred
# source.
# shellcheck disable=SC2154
if [[ $change == route && $route == 'default '*':'* ]]; then
if [[ $route =~ ^(.*)( +expires +[^ ]+)(.*)$ ]]; then
route="${BASH_REMATCH[1]}${BASH_REMATCH[3]}"
fi
if [[ $action == add && -z ${gbmc_br_gw_src_routes["$route"]} ]]; then
gbmc_br_gw_src_routes["$route"]=1
gbmc_br_gw_src_update
gbmc_br_set_router
elif [[ $action == del && -n "${gbmc_br_gw_src_routes["$route"]}" ]]; then
unset 'gbmc_br_gw_src_routes[$route]'
gbmc_br_gw_src_update
gbmc_br_set_router
fi
# Match only global IP addresses on the bridge that match the BMC stateless
# prefix (<mpfx>:fd00:). So 2002:af4:3480:2248:fd00:6345:3069:9186 would be
# matched as the preferred source IP for outoging traffic.
elif [[ $change == addr && $intf == gbmcbr && $scope == global ]] &&
[[ $fam == inet6 && $flags != *tentative* ]]; then
local ip_bytes=()
if ! ip_to_bytes ip_bytes "$ip"; then
echo "gBMC Bridge Ensure RA Invalid IP: $ip" >&2
return 1
fi
# Ignore ULAs and non-gBMC addresses
if (( ip_bytes[0] & 0xfe == 0xfc || ip_bytes[8] != 0xfd )); then
return 0
fi
if (( ip_bytes[9] != 0 )); then
local -n gbmc_br_gw_src_ip=gbmc_br_gw_src_ip_stateful
else
local -n gbmc_br_gw_src_ip=gbmc_br_gw_src_ip_stateless
fi
if [[ $action == add && $ip != "$gbmc_br_gw_src_ip" ]]; then
gbmc_br_gw_src_ip="$ip"
gbmc_br_gw_src_update
fi
if [[ $action == del && $ip == "$gbmc_br_gw_src_ip" ]]; then
gbmc_br_gw_src_ip=
fi
fi
}
GBMC_IP_MONITOR_HOOKS+=(gbmc_br_gw_src_hook)
gbmc_br_gw_src_lib=1