diff options
Diffstat (limited to 'meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-gw-src.sh')
-rw-r--r-- | meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-gw-src.sh | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-gw-src.sh b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-gw-src.sh new file mode 100644 index 000000000..cfe993f28 --- /dev/null +++ b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-gw-src.sh @@ -0,0 +1,74 @@ +# 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 "${gbmc_br_gw_src_lib-}" ] || return + +source /usr/share/network/lib.sh || exit + +gbmc_br_gw_src_ip= +declare -A gbmc_br_gw_src_routes=() + +gbmc_br_gw_src_update() { + [ -n "$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 + ip route change $route src "$gbmc_br_gw_src_ip" + unset 'gbmc_br_gw_src_routes[$route]' + done +} + +gbmc_br_gw_src_hook() { + # We only want to match default gateway routes that are dynamic + # (have an expiration time). These will be updated with our preferred + # source. + if [[ "$change" == 'route' && "$route" == 'default '*':'* ]]; then + if [[ "$route" =~ ^(.*)( +expires +[^ ]+)(.*)$ ]]; then + route="${BASH_REMATCH[1]}${BASH_REMATCH[3]}" + fi + if [ "$action" = 'add' -a -z "${gbmc_br_gw_src_routes["$route"]}" ]; then + gbmc_br_gw_src_routes["$route"]=1 + gbmc_br_gw_src_update + elif [ "$action" = 'del' -a -n "${gbmc_br_gw_src_routes["$route"]}" ]; then + unset 'gbmc_br_gw_src_routes[$route]' + gbmc_br_gw_src_update + 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 [ "$change" = 'addr' -a "$intf" = 'gbmcbr' -a "$scope" = 'global' ] && + [[ "$fam" == 'inet6' && "$flags" != *tentative* ]]; then + local ip_bytes=() + if ! ip_to_bytes ip_bytes "$ip"; then + echo "gBMC Bridge Ensure RA Invalid IP: $ip" >&2 + return 1 + fi + if (( ip_bytes[8] != 0xfd || ip_bytes[9] != 0 )); then + return 0 + fi + if [ "$action" = 'add' -a "$ip" != "$gbmc_br_gw_src_ip" ]; then + gbmc_br_gw_src_ip="$ip" + gbmc_br_gw_src_update + fi + if [ "$action" = 'del' -a "$ip" = "$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 |