meta-google/recipes-google/ncsi/files/gbmc-ncsi-ra.sh

#!/bin/bash
# Copyright 2024 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.

RA_IF=$1
IP_OFFSET=1
# NCSI is known to be closer to the ToR than bridge routes. Prefer over bridge routes.
ROUTE_METRIC=900
ROUTE_TABLE=900

update_rtr() {
  busctl set-property xyz.openbmc_project.Network /xyz/openbmc_project/network/"$RA_IF" \
    xyz.openbmc_project.Network.EthernetInterface DefaultGateway6 s "" || true

  default_update_rtr "$@"

  # Add additional gateway information
  for file in /run/systemd/network/{00,}-bmc-$RA_IF.network; do
    mkdir -p "$file.d"
    printf '[Route]\nGateway=%s\nGatewayOnLink=true\nTable=%d' \
      "$rtr" "$ROUTE_TABLE" >"$file.d"/10-gateway-table.conf
  done

  ip -6 route replace default via "$rtr" onlink dev "$RA_IF" table "$ROUTE_TABLE" || \
    networkctl reload && networkctl reconfigure "$RA_IF"
}

ncsi_is_active() {
  systemctl is-active -q nic-hostless@"$RA_IF".target && return
  systemctl is-active -q nic-hostful@"$RA_IF".target && return
  return 1
}

update_fqdn() {
  true
}

old_ncsi_pfx=

update_pfx() {
  local pfx="$1"

  # We only do this for smartNICs (which don't use NCSI)
  ncsi_is_active && return

  # Don't change anything for an empty prefix
  [ -z "$pfx" ] && return

  # We no longer need NCSId if we are in this configuration
  systemctl stop --no-block ncsid@"$RA_IF" || true

  # DHCP Relay workaround until alternate source port is supported
  # TODO: Remove this once internal relaying cleanups land
  gbmc-ncsi-smartnic-wa.sh || true

  # Override any existing address information within files
  # Make sure we cover `00-*` and `-*` files
  for file in /run/systemd/network/{00,}-bmc-gbmcbr.network; do
    mkdir -p "$file.d"
    printf '[Network]\nAddress=%s/128' \
      "$pfx" >"$file.d"/10-ncsi-addr.conf
  done

  # Don't force networkd to reload as this can break phosphor-networkd
  # Fall back to reload only if ip link commands fail
  if [ -n "$old_ncsi_pfx" ]; then
    ip -6 addr del "$old_ncsi_pfx/128" dev gbmcbr || true
  fi
  ip -6 addr replace "$pfx/128" dev gbmcbr || \
    (networkctl reload && networkctl reconfigure gbmcbr) || true
  old_ncsi_pfx=$pfx

  echo "Set NCSI addr $pfx on gbmcbr" >&2
}

# shellcheck source=meta-google/recipes-google/networking/gbmc-net-common/gbmc-ra.sh
source /usr/share/gbmc-ra.sh || exit