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# 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.
[ -z "${gbmc_br_from_ra_lib-}" ] || return
source /usr/share/network/lib.sh || exit
gbmc_br_from_ra_init=
gbmc_br_from_ra_mac=
declare -A gbmc_br_from_ra_pfxs=()
declare -A gbmc_br_from_ra_prev_addrs=()
gbmc_br_from_ra_update() {
[ -n "$gbmc_br_from_ra_init" -a -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() {
if [ "$change" = 'init' ]; then
gbmc_br_from_ra_init=1
gbmc_br_from_ra_update
elif [[ "$change" == 'route' && "$route" != *' via '* ]] &&
[[ "$route" =~ ^(.* dev gbmcbr proto ra .*)( +expires +([^ ]+)sec).*$ ]]; then
pfx="${route%% *}"
if [ "$action" = 'add' ]; then
gbmc_br_from_ra_pfxs["$pfx"]="${BASH_REMATCH[3]}"
gbmc_br_from_ra_update
elif [ "$action" = 'del' ]; then
gbmc_br_from_ra_pfxs["$pfx"]=0
gbmc_br_from_ra_update
fi
elif [ "$change" = 'link' -a "$intf" = 'gbmcbr' ]; then
rdisc6 -m gbmcbr -r 1 -w 100 >/dev/null 2>&1
if [ "$action" = 'add' -a "$mac" != "$gbmc_br_from_ra_mac" ]; then
gbmc_br_from_ra_mac="$mac"
gbmc_br_from_ra_update
fi
if [ "$action" = 'del' -a "$mac" = "$gbmc_br_from_ra_mac" ]; then
gbmc_br_from_ra_mac=
gbmc_br_from_ra_update
fi
fi
}
GBMC_IP_MONITOR_HOOKS+=(gbmc_br_from_ra_hook)
gbmc_br_from_ra_lib=1
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