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William A. Kennington III53527f32021-04-27 13:05:45 -07001# Copyright 2021 Google LLC
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7# http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15[ -z "${gbmc_br_nft_lib-}" ] || return
16
William A. Kennington III4f233cd2021-05-07 03:25:25 -070017source /usr/share/network/lib.sh || exit
18
William A. Kennington III53527f32021-04-27 13:05:45 -070019gbmc_br_nft_init=
20gbmc_br_nft_pfx=
21
22gbmc_br_nft_update() {
23 printf 'gBMC Bridge input firewall for %s\n' \
24 "${gbmc_br_nft_pfx:-(deleted)}" >&2
25
26 local contents=
27 contents+='table inet filter {'$'\n'
28 contents+=' chain gbmc_br_int_input {'$'\n'
29 if [ -n "${gbmc_br_nft_pfx-}" ]; then
30 contents+=" ip6 saddr $gbmc_br_nft_pfx"
31 contents+=" ip6 daddr $gbmc_br_nft_pfx accept"$'\n'
32 fi
33 contents+=' }'$'\n'
34 contents+='}'$'\n'
35
36 local rfile=/run/nftables/40-gbmc-br-int.rules
37 mkdir -p -m 755 "$(dirname "$rfile")"
38 printf '%s' "$contents" >"$rfile"
39
William A. Kennington III7356f8e2021-12-15 02:21:52 -080040 systemctl reset-failed nftables && systemctl --no-block reload-or-restart nftables || true
William A. Kennington III53527f32021-04-27 13:05:45 -070041}
42
43gbmc_br_nft_hook() {
44 if [ "$change" = 'init' ]; then
45 gbmc_br_nft_init=1
46 gbmc_br_nft_update
47 # Match only global IP addresses on the bridge that match the BMC prefix
48 # (<mpfx>:fdxx:). So 2002:af4:3480:2248:fd02:6345:3069:9186 would become
William A. Kennington IIIa22b4452021-11-04 22:57:43 -070049 # a 2002:af4:3480:2248:fd00/76 rule.
William A. Kennington III53527f32021-04-27 13:05:45 -070050 elif [ "$change" = 'addr' -a "$intf" = 'gbmcbr' -a "$scope" = 'global' ] &&
William A. Kennington III4f233cd2021-05-07 03:25:25 -070051 [[ "$fam" == 'inet6' && "$flags" != *tentative* ]]; then
52 local ip_bytes=()
53 if ! ip_to_bytes ip_bytes "$ip"; then
54 echo "gBMC Bridge NFT Invalid IP: $ip" >&2
55 return 1
56 fi
William A. Kennington III6ca70332021-05-10 03:14:42 -070057 if (( ip_bytes[8] != 0xfd )); then
William A. Kennington III4f233cd2021-05-07 03:25:25 -070058 return 0
59 fi
William A. Kennington III6ca70332021-05-10 03:14:42 -070060 local i
61 for (( i=9; i<16; i++ )); do
62 ip_bytes[$i]=0
63 done
William A. Kennington IIIa22b4452021-11-04 22:57:43 -070064 pfx="$(ip_bytes_to_str ip_bytes)/76"
William A. Kennington III53527f32021-04-27 13:05:45 -070065 if [ "$action" = "add" -a "$pfx" != "$gbmc_br_nft_pfx" ]; then
66 gbmc_br_nft_pfx="$pfx"
67 gbmc_br_nft_update
68 fi
69 fi
70}
71
72GBMC_IP_MONITOR_HOOKS+=(gbmc_br_nft_hook)
73
74gbmc_br_nft_lib=1