diff options
Diffstat (limited to 'meta-google/recipes-google/ncsi/files/gbmc-ncsi-ip-from-ra.sh.in')
-rwxr-xr-x | meta-google/recipes-google/ncsi/files/gbmc-ncsi-ip-from-ra.sh.in | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/meta-google/recipes-google/ncsi/files/gbmc-ncsi-ip-from-ra.sh.in b/meta-google/recipes-google/ncsi/files/gbmc-ncsi-ip-from-ra.sh.in new file mode 100755 index 000000000..80bd34f04 --- /dev/null +++ b/meta-google/recipes-google/ncsi/files/gbmc-ncsi-ip-from-ra.sh.in @@ -0,0 +1,133 @@ +#!/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. + +source /usr/share/network/lib.sh || exit +source /usr/libexec/ncsid_lib.sh || exit + +NCSI_IF='@NCSI_IF@' + +old_pfx= +old_fqdn= +old_rtr= + +set_host() { + [ -n "$host" -a -n "$domain" -a -n "$hextet" ] || return + + local fqdn="$host-n$hextet.$domain" + [ "$fqdn" != "$old_fqdn" ] || return + old_fqdn="$fqdn" + + echo "Found hostname $fqdn" >&2 + hostnamectl set-hostname "$fqdn" || true +} + +set_net() { + [ -n "$pfx" -a -n "$rtr" ] || return + [[ "$pfx" != "$old_pfx" || "$rtr" != "$old_rtr" ]] || return + old_pfx="$pfx" + old_rtr="$rtr" + + echo "Found prefix $pfx from $rtr" >&2 + + # Delete any stale IP Addresses from the primary interface as we won't use them + UpdateIP xyz.openbmc_project.Network "$NCSI_IF" '0.0.0.0' '0' || true + UpdateIP xyz.openbmc_project.Network "$NCSI_IF" '::' '0' || true + + read -r -d '' contents <<EOF +[Network] +Address=$pfx/128 +IPv6PrefixDelegation=yes +[IPv6PrefixDelegation] +RouterLifetimeSec=60 +[IPv6Prefix] +Prefix=$stateless_pfx/80 +PreferredLifetimeSec=60 +ValidLifetimeSec=60 +[IPv6RoutePrefix] +Route=$pfx/80 +LifetimeSec=60 +[Route] +Destination=$stateless_pfx/76 +Type=unreachable +Metric=1024 +EOF + for file in /run/systemd/network/{00,}-bmc-gbmcbr.network.d/49-public-ra.conf; do + mkdir -p -m 755 "$(dirname "$file")" + printf '%s' "$contents" >"$file" + done + touch -c /lib/systemd/network/*-bmc-gbmcbr.network || true + + contents='[Network]'$'\n' + contents+="Address=$pfx/128"$'\n' + contents+="Gateway=$rtr"$'\n' + for file in /run/systemd/network/{00,}-bmc-"$NCSI_IF".network.d/49-public-ra.conf; do + mkdir -p -m 755 "$(dirname "$file")" + printf '%s' "$contents" >"$file" + done + touch -c /etc/systemd/network/*-bmc-"$NCSI_IF".network || true + + if [ "$(systemctl is-active systemd-networkd)" != 'inactive' ]; then + networkctl reload && networkctl reconfigure gbmcbr "$NCSI_IF" || true + 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 $pfx/76 accept + } +} +EOF + rfile=/run/nftables/40-gbmc-ncsi-ra.rules + mkdir -p -m 755 "$(dirname "$rfile")" + printf '%s' "$contents" >"$rfile" + systemctl reset-failed nftables && systemctl --no-block restart nftables || true +} + +w=60 +while true; do + start=$SECONDS + while read line; do + if [ -z "$line" ]; then + hextet= + pfx= + host= + domain= + elif [[ "$line" =~ ^Prefix' '*:' '*(.*)/([0-9]+)$ ]]; then + t_pfx="${BASH_REMATCH[1]}" + t_pfx_len="${BASH_REMATCH[2]}" + ip_to_bytes t_pfx_b "$t_pfx" || continue + (( t_pfx_len == 76 && t_pfx_b[8] & 0xfd == 0xfd )) || continue + (( t_pfx_b[9] |= 1 )) + hextet="fd$(printf '%02x' ${t_pfx_b[9]})" + pfx="$(ip_bytes_to_str t_pfx_b)" + (( t_pfx_b[9] &= 0xf0 )) + stateless_pfx="$(ip_bytes_to_str t_pfx_b)" + elif [[ "$line" =~ ^'DNS search list'' '*:' '*([^.-]*)[^.]*[.](.*.google.com)$ ]]; then + host="${BASH_REMATCH[1]}" + domain="${BASH_REMATCH[2]}" + elif [[ "$line" =~ ^from' '(.*)$ ]]; then + rtr="${BASH_REMATCH[1]}" + set_net || true + set_host || true + fi + done < <(rdisc6 -d -m "$NCSI_IF" -w $(( w * 1000 )) 2>/dev/null) + # If rdisc6 exits early we still want to wait the full `w` time before + # starting again. + (( timeout = start + w - SECONDS )) + sleep $(( timeout < 0 ? 0 : timeout )) +done |