1#!/bin/bash 2# Copyright 2022 Google LLC 3# 4# Licensed under the Apache License, Version 2.0 (the "License"); 5# you may not use this file except in compliance with the License. 6# You may obtain a copy of the License at 7# 8# http://www.apache.org/licenses/LICENSE-2.0 9# 10# Unless required by applicable law or agreed to in writing, software 11# distributed under the License is distributed on an "AS IS" BASIS, 12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13# See the License for the specific language governing permissions and 14# limitations under the License. 15 16[ -n "${gbmc_br_lib_init-}" ] && return 17 18# SC can't find this path during repotest 19# shellcheck disable=SC1091 20source /usr/share/network/lib.sh || exit 21 22# A list of functions which get executed for each configured IP. 23# These are configured by the files included below. 24# Shellcheck does not understand how this gets referenced 25# shellcheck disable=SC2034 26GBMC_BR_LIB_SET_IP_HOOKS=() 27 28gbmc_br_source_dir() { 29 local dir="$1" 30 31 local file 32 while read -r -d $'\0' file; do 33 # SC doesn't like dynamic source loading 34 # shellcheck disable=SC1090 35 source "$file" || return 36 done < <(shopt -s nullglob; for f in "$dir"/*.sh; do printf '%s\0' "$f"; done) 37} 38 39# Load configurations from a known location in the filesystem to populate 40# hooks that are executed after each event. 41gbmc_br_source_dir /usr/share/gbmc-br-lib || exit 42 43gbmc_br_run_hooks() { 44 local -n hookvar="$1" 45 shift 46 local hook 47 for hook in "${hookvar[@]}"; do 48 "$hook" "$@" || return 49 done 50} 51 52gbmc_br_reload() { 53 if [ "$(systemctl is-active systemd-networkd)" != 'inactive' ]; then 54 networkctl reload && networkctl reconfigure gbmcbr 55 fi 56} 57 58gbmc_br_no_ip() { 59 echo "Runtime removing gbmcbr IP" >&2 60 rm -f /run/systemd/network/{00,}-bmc-gbmcbr.network.d/50-public.conf 61 gbmc_br_reload 62} 63 64gbmc_br_reload_ip() { 65 local ip="${1-}" 66 67 if [ -z "$ip" ] && ! ip="$(cat /var/google/gbmc-br-ip 2>/dev/null)"; then 68 echo "Ignoring unconfigured IP" >&2 69 gbmc_br_no_ip 70 return 0 71 fi 72 73 local pfx_bytes=() 74 if ! ip_to_bytes pfx_bytes "$ip"; then 75 echo "Ignoring Invalid IPv6: $ip" >&2 76 gbmc_br_no_ip 77 return 0 78 fi 79 80 local pfx 81 pfx="$(ip_bytes_to_str pfx_bytes)" 82 (( pfx_bytes[9] &= 0xf0 )) 83 local stateless_pfx 84 stateless_pfx="$(ip_bytes_to_str pfx_bytes)" 85 local contents 86 read -r -d '' contents <<EOF 87[Network] 88Address=$pfx/128 89[IPv6Prefix] 90Prefix=$stateless_pfx/80 91PreferredLifetimeSec=60 92ValidLifetimeSec=60 93[IPv6RoutePrefix] 94Route=$pfx/80 95LifetimeSec=60 96[Route] 97Destination=$stateless_pfx/76 98Type=unreachable 99Metric=1024 100EOF 101 echo "Runtime setting gbmcbr IP: $pfx" >&2 102 103 local file 104 for file in /run/systemd/network/{00,}-bmc-gbmcbr.network.d/50-public.conf; do 105 mkdir -p "$(dirname "$file")" 106 printf '%s' "$contents" >"$file" 107 done 108 109 gbmc_br_reload 110} 111 112gbmc_br_set_ip() { 113 local ip="${1-}" 114 115 if [ -n "$ip" ]; then 116 mkdir -p /var/google || return 117 echo "$ip" >/var/google/gbmc-br-ip || return 118 else 119 rm -rf /var/google/gbmc-br-ip 120 fi 121 122 # Remove legacy network configuration 123 rm -rf /etc/systemd/network/{00,}-bmc-gbmcbr.network.d 124 125 gbmc_br_run_hooks GBMC_BR_LIB_SET_IP_HOOKS "$ip" || return 126 127 gbmc_br_reload_ip "$ip" 128} 129 130gbmc_br_lib_init=1 131if ! (return 0 2>/dev/null); then 132 echo "gbmc-br-lib is a library, not executed directly" >&2 133 exit 1 134fi 135