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William A. Kennington III21e7e452021-11-05 01:31:59 -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
William A. Kennington III80a75282022-05-20 09:47:33 -070015[ -n "${gbmc_ncsi_br_deprecated_ips_lib-}" ] && return
William A. Kennington III21e7e452021-11-05 01:31:59 -070016
William A. Kennington III2f5e1692021-11-05 01:31:59 -070017source /usr/share/network/lib.sh || exit
18
William A. Kennington III21e7e452021-11-05 01:31:59 -070019gbmc_ncsi_br_deprecated_ips_init=
20gbmc_ncsi_br_deprecated_ips_confip=
21gbmc_ncsi_br_deprecated_ips_lastip=
William A. Kennington III9f57cee2022-11-03 14:17:35 -070022gbmc_ncsi_br_deprecated_ips_lastncsi=
23gbmc_ncsi_br_deprecated_ips_confncsi=
William A. Kennington III21e7e452021-11-05 01:31:59 -070024
25gbmc_ncsi_br_deprecated_ips_update() {
26 [ -n "$gbmc_ncsi_br_deprecated_ips_init" ] || return
William A. Kennington III9f57cee2022-11-03 14:17:35 -070027 [ "$gbmc_ncsi_br_deprecated_ips_confip" != "$gbmc_ncsi_br_deprecated_ips_lastip" ] || \
28 [ "$gbmc_ncsi_br_deprecated_ips_confncsi" != "$gbmc_ncsi_br_deprecated_ips_lastncsi" ] || return
William A. Kennington III21e7e452021-11-05 01:31:59 -070029 gbmc_ncsi_br_deprecated_ips_confip="$gbmc_ncsi_br_deprecated_ips_lastip"
William A. Kennington III9f57cee2022-11-03 14:17:35 -070030 gbmc_ncsi_br_deprecated_ips_confncsi="$gbmc_ncsi_br_deprecated_ips_lastncsi"
William A. Kennington III21e7e452021-11-05 01:31:59 -070031
William A. Kennington III80a75282022-05-20 09:47:33 -070032 printf 'gBMC NCSI Deprecated Addrs: %s\n' \
William A. Kennington III21e7e452021-11-05 01:31:59 -070033 "${gbmc_ncsi_br_deprecated_ips_lastip:-(deleted)}" >&2
34
35 local contents=
William A. Kennington IIIb823f892021-11-23 20:54:56 -080036 local nfcontents=
William A. Kennington III21e7e452021-11-05 01:31:59 -070037 if [ -n "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
38 local pfx_bytes=()
39 ip_to_bytes pfx_bytes "$gbmc_ncsi_br_deprecated_ips_lastip"
40
41 local pfx="$(ip_bytes_to_str pfx_bytes)"
William A. Kennington III3dbea932021-11-05 01:31:59 -070042 (( pfx_bytes[9] &= 0xf0 ))
43 local stateless_pfx="$(ip_bytes_to_str pfx_bytes)"
William A. Kennington III80a75282022-05-20 09:47:33 -070044 local stateless_ip=
45 if [ -e /sys/class/net/gbmcbr ]; then
46 local gbmcbr_mac="$(ip link show gbmcbr | tail -n 1 | awk '{print $2}')"
47 local gbmcbr_eui48="$(mac_to_eui48 "$gbmcbr_mac")"
48 stateless_ip="$(ip_pfx_concat "$stateless_pfx/80" "$gbmcbr_eui48")"
49 stateless_ip="${stateless_ip%/*}"
50 fi
William A. Kennington III21e7e452021-11-05 01:31:59 -070051 pfx_bytes[8]=0
52 pfx_bytes[9]=0
William A. Kennington III9f57cee2022-11-03 14:17:35 -070053 local host_pfx=
54 if [ -n "${gbmc_ncsi_br_deprecated_ips_confncsi}" ]; then
55 # Only impersonate the host if we have an NCSI state machine
56 host_pfx="$(ip_bytes_to_str pfx_bytes)"
57 fi
William A. Kennington III80a75282022-05-20 09:47:33 -070058 read -r -d '' contents <<EOF
59[Network]
60IPv6ProxyNDP=yes
61IPv6ProxyNDPAddress=$pfx
62IPv6ProxyNDPAddress=$stateless_pfx
William A. Kennington III9f57cee2022-11-03 14:17:35 -070063${host_pfx:+IPv6ProxyNDPAddress=}$host_pfx
William A. Kennington III80a75282022-05-20 09:47:33 -070064${stateless_ip:+IPv6ProxyNDPAddress=}$stateless_ip
65EOF
William A. Kennington IIIb823f892021-11-23 20:54:56 -080066 read -r -d '' nfcontents <<EOF
67table inet filter {
68 chain ncsi_input {
69 ip6 saddr != $pfx/76 ip6 daddr $pfx/76 goto ncsi_gbmc_br_pub_input
William A. Kennington III9f57cee2022-11-03 14:17:35 -070070 ${host_pfx:+ip6 daddr $host_pfx/64 goto ncsi_legacy_input}
William A. Kennington IIIb823f892021-11-23 20:54:56 -080071 }
72 chain ncsi_forward {
73 ip6 saddr != $pfx/76 ip6 daddr $pfx/76 accept
74 }
75}
76EOF
William A. Kennington III21e7e452021-11-05 01:31:59 -070077 fi
78
79 local file
80 for file in /run/systemd/network/{00,}-bmc-@NCSI_IF@.network.d/50-deprecated.conf; do
81 mkdir -p -m 755 "$(dirname "$file")"
82 if [ -z "$contents" ]; then
83 rm -f "$file"
84 else
85 printf '%s' "$contents" >"$file"
86 fi
87 done
88
89 # Ensure that systemd-networkd performs a reconfiguration as it doesn't
90 # currently check the mtime of drop-in files.
91 touch -c /etc/systemd/network/*-bmc-@NCSI_IF@.network
92
93 if [ "$(systemctl is-active systemd-networkd)" != 'inactive' ]; then
94 networkctl reload && networkctl reconfigure @NCSI_IF@
95 fi
96
William A. Kennington IIIb823f892021-11-23 20:54:56 -080097 local rfile=/run/nftables/40-gbmc-ncsi-br.rules
William A. Kennington III21e7e452021-11-05 01:31:59 -070098 mkdir -p -m 755 "$(dirname "$rfile")"
William A. Kennington IIIb823f892021-11-23 20:54:56 -080099 if [ -z "$nfcontents" ]; then
100 rm -f "$rfile"
101 else
102 printf '%s' "$nfcontents" >"$rfile"
103 fi
William A. Kennington III7356f8e2021-12-15 02:21:52 -0800104 systemctl reset-failed nftables && systemctl --no-block reload-or-restart nftables || true
William A. Kennington III21e7e452021-11-05 01:31:59 -0700105}
106
107gbmc_ncsi_br_deprecated_ips_hook() {
108 if [ "$change" = 'init' ]; then
109 gbmc_ncsi_br_deprecated_ips_init=1
110 gbmc_ip_monitor_defer
111 elif [ "$change" = 'defer' ]; then
112 gbmc_ncsi_br_deprecated_ips_update
William A. Kennington III80a75282022-05-20 09:47:33 -0700113 elif [ "$change" = 'addr' -a "$scope" = 'global' -a "$fam" = 'inet6' ] &&
114 [ "$intf" = 'gbmcbr' -o "$intf" = '@NCSI_IF@' ] &&
115 [[ "$flags" != *deprecated* ]]; then
William A. Kennington III21e7e452021-11-05 01:31:59 -0700116 local pfx_bytes=()
117 ip_to_bytes pfx_bytes "$ip" || return
118 # No ULA Addresses
119 if (( pfx_bytes[0] & 0xfe == 0xfc )); then
120 return
121 fi
122 # We only want to allow a <pfx>::fd0x address, where x>0
123 if (( pfx_bytes[8] != 0xfd || pfx_bytes[9] & 0xf == 0 )); then
124 return
125 fi
126 for (( i = 10; i < 16; ++i )); do
127 if (( pfx_bytes[i] != 0 )); then
128 return
129 fi
130 done
131 if [ "$action" = 'add' -a "$ip" != "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
132 gbmc_ncsi_br_deprecated_ips_lastip="$ip"
133 gbmc_ip_monitor_defer
134 fi
135 if [ "$action" = 'del' -a "$ip" = "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
136 gbmc_ncsi_br_deprecated_ips_lastip=
137 gbmc_ip_monitor_defer
138 fi
William A. Kennington III9f57cee2022-11-03 14:17:35 -0700139 elif [ "$change" = 'link' -a "$action" = 'add' -a "$intf" = '@NCSI_IF@' ]; then
140 if ip link show '@NCSI_IF@' | grep -q '^ *alias ncsi$'; then
141 gbmc_ncsi_br_deprecated_ips_lastncsi=1
142 gbmc_ip_monitor_defer
143 else
144 gbmc_ncsi_br_deprecated_ips_lastncsi=
145 gbmc_ip_monitor_defer
146 fi
William A. Kennington III21e7e452021-11-05 01:31:59 -0700147 fi
148}
149
150GBMC_IP_MONITOR_HOOKS+=(gbmc_ncsi_br_deprecated_ips_hook)
151
152gbmc_ncsi_br_deprecated_ips_lib=1