Your Name
75 lines
2.2 KiB
Bash
75 lines
2.2 KiB
Bash
#!/bin/bash
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# Copyright 2021 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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[[ -n ${gbmc_br_nft_lib-} ]] && return
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# shellcheck source=meta-google/recipes-google/networking/network-sh/lib.sh
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source /usr/share/network/lib.sh || exit
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gbmc_br_nft_pfx=
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gbmc_br_nft_update() {
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printf 'gBMC Bridge input firewall for %s\n' \
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"${gbmc_br_nft_pfx:-(deleted)}" >&2
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local contents=
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contents+='table inet filter {'$'\n'
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contents+=' chain gbmc_br_int_input {'$'\n'
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if [[ -n ${gbmc_br_nft_pfx-} ]]; then
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contents+=" ip6 saddr $gbmc_br_nft_pfx"
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contents+=" ip6 daddr $gbmc_br_nft_pfx accept"$'\n'
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fi
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contents+=' }'$'\n'
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contents+='}'$'\n'
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local rfile=/run/nftables/40-gbmc-br-int.rules
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mkdir -p "$(dirname "$rfile")"
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printf '%s' "$contents" >"$rfile"
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# shellcheck disable=SC2015
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systemctl reset-failed nftables && systemctl --no-block reload-or-restart nftables || true
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}
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gbmc_br_nft_hook() {
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# Match only global IP addresses on the bridge that match the BMC prefix
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# (<mpfx>:fdxx:). So 2002:af4:3480:2248:fd02:6345:3069:9186 would become
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# a 2002:af4:3480:2248:fd00/76 rule.
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# shellcheck disable=SC2154
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if [[ $change == addr && $intf == gbmcbr && $scope == global ]] &&
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[[ $fam == inet6 && $flags != *tentative* ]]; then
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local ip_bytes=()
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if ! ip_to_bytes ip_bytes "$ip"; then
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echo "gBMC Bridge NFT Invalid IP: $ip" >&2
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return 1
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fi
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if (( ip_bytes[8] != 0xfd )); then
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return 0
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fi
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local i
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for (( i=9; i<16; i++ )); do
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ip_bytes["$i"]=0
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done
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pfx="$(ip_bytes_to_str ip_bytes)/76"
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if [[ $action == add && $pfx != "$gbmc_br_nft_pfx" ]]; then
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gbmc_br_nft_pfx="$pfx"
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gbmc_br_nft_update
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fi
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fi
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}
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GBMC_IP_MONITOR_HOOKS+=(gbmc_br_nft_hook)
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gbmc_br_nft_lib=1
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