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# 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 "${gbmc_ncsi_br_deprecated_ips_lib-}" ] || return
source /usr/share/network/lib.sh || exit
gbmc_ncsi_br_deprecated_ips_init=
gbmc_ncsi_br_deprecated_ips_confip=
gbmc_ncsi_br_deprecated_ips_lastip=
gbmc_ncsi_br_deprecated_ips_update() {
[ -n "$gbmc_ncsi_br_deprecated_ips_init" ] || return
[ "$gbmc_ncsi_br_deprecated_ips_confip" != "$gbmc_ncsi_br_deprecated_ips_lastip" ] || return
gbmc_ncsi_br_deprecated_ips_confip="$gbmc_ncsi_br_deprecated_ips_lastip"
printf 'gBMC Bridge NCSI Deprecated Addrs: %s\n' \
"${gbmc_ncsi_br_deprecated_ips_lastip:-(deleted)}" >&2
local contents=
if [ -n "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
local pfx_bytes=()
ip_to_bytes pfx_bytes "$gbmc_ncsi_br_deprecated_ips_lastip"
local pfx="$(ip_bytes_to_str pfx_bytes)"
(( pfx_bytes[9] &= 0xf0 ))
local stateless_pfx="$(ip_bytes_to_str pfx_bytes)"
pfx_bytes[8]=0
pfx_bytes[9]=0
local host_pfx="$(ip_bytes_to_str pfx_bytes)"
read -r -d '' contents <<EOF
[Address]
Address=$pfx/128
PreferredLifetime=0
[Address]
Address=$stateless_pfx/128
PreferredLifetime=0
[Address]
Address=$host_pfx/128
PreferredLifetime=0
EOF
fi
local file
for file in /run/systemd/network/{00,}-bmc-@NCSI_IF@.network.d/50-deprecated.conf; do
mkdir -p -m 755 "$(dirname "$file")"
if [ -z "$contents" ]; then
rm -f "$file"
else
printf '%s' "$contents" >"$file"
fi
done
# Ensure that systemd-networkd performs a reconfiguration as it doesn't
# currently check the mtime of drop-in files.
touch -c /etc/systemd/network/*-bmc-@NCSI_IF@.network
if [ "$(systemctl is-active systemd-networkd)" != 'inactive' ]; then
networkctl reload && networkctl reconfigure @NCSI_IF@
fi
read -r -d '' contents <<EOF
table inet filter {
chain ncsi_input {
ip6 saddr != $pfx/76 ip6 daddr $pfx/76 goto ncsi_gbmc_br_pub_input
}
chain ncsi_forward {
ip6 saddr != $pfx/76 ip6 daddr $pfx/76 accept
}
}
EOF
rfile=/run/nftables/40-gbmc-ncsi-br.rules
mkdir -p -m 755 "$(dirname "$rfile")"
printf '%s' "$contents" >"$rfile"
systemctl reset-failed nftables && systemctl --no-block restart nftables || true
}
gbmc_ncsi_br_deprecated_ips_hook() {
if [ "$change" = 'init' ]; then
gbmc_ncsi_br_deprecated_ips_init=1
gbmc_ip_monitor_defer
elif [ "$change" = 'defer' ]; then
gbmc_ncsi_br_deprecated_ips_update
elif [ "$change" = 'addr' -a "$intf" = 'gbmcbr' ] &&
[ "$scope" = 'global' -a "$fam" = 'inet6' ]; then
local pfx_bytes=()
ip_to_bytes pfx_bytes "$ip" || return
# No ULA Addresses
if (( pfx_bytes[0] & 0xfe == 0xfc )); then
return
fi
# We only want to allow a <pfx>::fd0x address, where x>0
if (( pfx_bytes[8] != 0xfd || pfx_bytes[9] & 0xf == 0 )); then
return
fi
for (( i = 10; i < 16; ++i )); do
if (( pfx_bytes[i] != 0 )); then
return
fi
done
if [ "$action" = 'add' -a "$ip" != "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
gbmc_ncsi_br_deprecated_ips_lastip="$ip"
gbmc_ip_monitor_defer
fi
if [ "$action" = 'del' -a "$ip" = "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
gbmc_ncsi_br_deprecated_ips_lastip=
gbmc_ip_monitor_defer
fi
fi
}
GBMC_IP_MONITOR_HOOKS+=(gbmc_ncsi_br_deprecated_ips_hook)
gbmc_ncsi_br_deprecated_ips_lib=1
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