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#!/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_from_ra_lib-} ]] && return
# shellcheck source=meta-google/recipes-google/networking/network-sh/lib.sh
source /usr/share/network/lib.sh || exit
gbmc_br_from_ra_init=
gbmc_br_from_ra_mac=
declare -A gbmc_br_from_ra_pfxs=()
declare -A gbmc_br_from_ra_prev_addrs=()
gbmc_br_from_ra_update() {
[[ -n $gbmc_br_from_ra_init && -n $gbmc_br_from_ra_mac ]] || return
local pfx
for pfx in "${!gbmc_br_from_ra_pfxs[@]}"; do
local cidr
if ! cidr="$(ip_pfx_to_cidr "$pfx")"; then
unset 'gbmc_br_from_ra_pfxs[$pfx]'
continue
fi
if (( cidr == 80 )); then
local sfx
if ! sfx="$(mac_to_eui48 "$gbmc_br_from_ra_mac")"; then
unset 'gbmc_br_from_ra_pfxs[$pfx]'
continue
fi
local addr
if ! addr="$(ip_pfx_concat "$pfx" "$sfx")"; then
unset 'gbmc_br_from_ra_pfxs[$pfx]'
continue
fi
else
unset 'gbmc_br_from_ra_pfxs[$pfx]'
continue
fi
local valid="${gbmc_br_from_ra_pfxs["$pfx"]}"
if (( valid > 0 )); then
if [[ -z ${gbmc_br_from_ra_prev_addrs["$addr"]-} ]]; then
echo "gBMC Bridge RA Addr Add: $addr" >&2
gbmc_br_from_ra_prev_addrs["$addr"]=1
fi
ip addr replace "$addr" dev gbmcbr noprefixroute
else
if [[ -n ${gbmc_br_from_ra_prev_addrs["$addr"]-} ]]; then
echo "gBMC Bridge RA Addr Del: $addr" >&2
unset 'gbmc_br_from_ra_prev_addrs[$addr]'
fi
ip addr del "$addr" dev gbmcbr
unset 'gbmc_br_from_ra_pfxs[$pfx]'
fi
done
}
gbmc_br_from_ra_hook() {
# shellcheck disable=SC2154
if [[ $change == init ]]; then
gbmc_br_from_ra_init=1
gbmc_ip_monitor_defer
elif [[ $change == defer ]]; then
gbmc_br_from_ra_update
elif [[ $change == route && $route != *' via '* ]] &&
[[ $route =~ ^(.* dev gbmcbr proto ra .*)( +expires +([^ ]+)sec).*$ ]]; then
pfx="${route%% *}"
# shellcheck disable=SC2154
if [[ $action == add ]]; then
gbmc_br_from_ra_pfxs["$pfx"]="${BASH_REMATCH[3]}"
gbmc_ip_monitor_defer
elif [[ $action == del ]]; then
gbmc_br_from_ra_pfxs["$pfx"]=0
gbmc_ip_monitor_defer
fi
elif [[ $change == link && $intf == gbmcbr ]]; then
rdisc6 -m gbmcbr -r 1 -w 100 >/dev/null 2>&1
if [[ $action == add && $mac != "$gbmc_br_from_ra_mac" ]]; then
gbmc_br_from_ra_mac="$mac"
gbmc_ip_monitor_defer
fi
if [[ $action == del && $mac == "$gbmc_br_from_ra_mac" ]]; then
gbmc_br_from_ra_mac=
gbmc_ip_monitor_defer
fi
fi
}
GBMC_IP_MONITOR_HOOKS+=(gbmc_br_from_ra_hook)
gbmc_br_from_ra_lib=1
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