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