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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 ${gbmc_br_nft_lib-} ]] && return
# shellcheck source=meta-google/recipes-google/networking/network-sh/lib.sh
source /usr/share/network/lib.sh || exit
gbmc_br_nft_pfx=
gbmc_br_nft_update() {
printf 'gBMC Bridge input firewall for %s\n' \
"${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 "$(dirname "$rfile")"
printf '%s' "$contents" >"$rfile"
# shellcheck disable=SC2015
systemctl reset-failed nftables && systemctl --no-block reload-or-restart nftables || true
}
gbmc_br_nft_hook() {
# 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:fd00/76 rule.
# shellcheck disable=SC2154
if [[ $change == addr && $intf == gbmcbr && $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)/76"
if [[ $action == add && $pfx != "$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
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