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#!/bin/bash
# Copyright 2022 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_lib_init-}" ] && return
# SC can't find this path during repotest
# shellcheck disable=SC1091
source /usr/share/network/lib.sh || exit
# A list of functions which get executed for each configured IP.
# These are configured by the files included below.
# Shellcheck does not understand how this gets referenced
# shellcheck disable=SC2034
GBMC_BR_LIB_SET_IP_HOOKS=()
gbmc_br_source_dir() {
local dir="$1"
local file
while read -r -d $'\0' file; do
# SC doesn't like dynamic source loading
# shellcheck disable=SC1090
source "$file" || return
done < <(shopt -s nullglob; for f in "$dir"/*.sh; do printf '%s\0' "$f"; done)
}
# Load configurations from a known location in the filesystem to populate
# hooks that are executed after each event.
gbmc_br_source_dir /usr/share/gbmc-br-lib || exit
gbmc_br_run_hooks() {
local -n hookvar="$1"
shift
local hook
for hook in "${hookvar[@]}"; do
"$hook" "$@" || return
done
}
gbmc_br_reload() {
if [ "$(systemctl is-active systemd-networkd)" != 'inactive' ]; then
networkctl reload && networkctl reconfigure gbmcbr
fi
}
gbmc_br_no_ip() {
echo "Runtime removing gbmcbr IP" >&2
rm -f /run/systemd/network/{00,}-bmc-gbmcbr.network.d/50-public.conf
gbmc_br_reload
}
gbmc_br_reload_ip() {
local ip="${1-}"
if [ -z "$ip" ] && ! ip="$(cat /var/google/gbmc-br-ip 2>/dev/null)"; then
echo "Ignoring unconfigured IP" >&2
gbmc_br_no_ip
return 0
fi
local pfx_bytes=()
if ! ip_to_bytes pfx_bytes "$ip"; then
echo "Ignoring Invalid IPv6: $ip" >&2
gbmc_br_no_ip
return 0
fi
local pfx
pfx="$(ip_bytes_to_str pfx_bytes)"
(( pfx_bytes[9] &= 0xf0 ))
local stateless_pfx
stateless_pfx="$(ip_bytes_to_str pfx_bytes)"
local contents
read -r -d '' contents <<EOF
[Network]
Address=$pfx/128
[IPv6Prefix]
Prefix=$stateless_pfx/80
PreferredLifetimeSec=60
ValidLifetimeSec=60
[IPv6RoutePrefix]
Route=$pfx/80
LifetimeSec=60
[Route]
Destination=$stateless_pfx/76
Type=unreachable
Metric=1024
EOF
echo "Runtime setting gbmcbr IP: $pfx" >&2
local file
for file in /run/systemd/network/{00,}-bmc-gbmcbr.network.d/50-public.conf; do
mkdir -p "$(dirname "$file")"
printf '%s' "$contents" >"$file"
done
gbmc_br_reload
}
gbmc_br_set_ip() {
local ip="${1-}"
if [ -n "$ip" ]; then
mkdir -p /var/google || return
echo "$ip" >/var/google/gbmc-br-ip || return
else
rm -rf /var/google/gbmc-br-ip
fi
# Remove legacy network configuration
rm -rf /etc/systemd/network/{00,}-bmc-gbmcbr.network.d
gbmc_br_run_hooks GBMC_BR_LIB_SET_IP_HOOKS "$ip" || return
gbmc_br_reload_ip "$ip"
}
gbmc_br_lib_init=1
return 0 2>/dev/null
echo "gbmc-br-lib is a library, not executed directly" >&2
exit 1
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