diff options
Diffstat (limited to 'meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh')
-rw-r--r-- | meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh new file mode 100644 index 000000000..19b8f64a1 --- /dev/null +++ b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh @@ -0,0 +1,76 @@ +# 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 "${gbmc_br_nft_lib-}" ] || return + +source /usr/share/network/lib.sh || exit + +gbmc_br_nft_init= +gbmc_br_nft_pfx= + +gbmc_br_nft_update() { + printf 'gBMC Bridge input firewall for %s\n' \ + "${gbmc_br_nft_pfx:-(deleted)}" >&2 + + local contents= + contents+='table inet filter {'$'\n' + contents+=' chain gbmc_br_int_input {'$'\n' + if [ -n "${gbmc_br_nft_pfx-}" ]; then + contents+=" ip6 saddr $gbmc_br_nft_pfx" + contents+=" ip6 daddr $gbmc_br_nft_pfx accept"$'\n' + fi + contents+=' }'$'\n' + contents+='}'$'\n' + + local rfile=/run/nftables/40-gbmc-br-int.rules + mkdir -p -m 755 "$(dirname "$rfile")" + printf '%s' "$contents" >"$rfile" + + echo 'Restarting nftables' >&2 + systemctl reset-failed nftables + systemctl --no-block restart nftables +} + +gbmc_br_nft_hook() { + if [ "$change" = 'init' ]; then + gbmc_br_nft_init=1 + gbmc_br_nft_update + # Match only global IP addresses on the bridge that match the BMC prefix + # (<mpfx>:fdxx:). So 2002:af4:3480:2248:fd02:6345:3069:9186 would become + # a 2002:af4:3480:2248:fd00/72 rule. + elif [ "$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 NFT Invalid IP: $ip" >&2 + return 1 + fi + if (( ip_bytes[8] != 0xfd )); then + return 0 + fi + local i + for (( i=9; i<16; i++ )); do + ip_bytes[$i]=0 + done + pfx="$(ip_bytes_to_str ip_bytes)/72" + if [ "$action" = "add" -a "$pfx" != "$gbmc_br_nft_pfx" ]; then + gbmc_br_nft_pfx="$pfx" + gbmc_br_nft_update + fi + fi +} + +GBMC_IP_MONITOR_HOOKS+=(gbmc_br_nft_hook) + +gbmc_br_nft_lib=1 |