1# Copyright 2021 Google LLC
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15[ -n "${gbmc_ncsi_br_deprecated_ips_lib-}" ] && return
16
17source /usr/share/network/lib.sh || exit
18
19gbmc_ncsi_br_deprecated_ips_init=
20gbmc_ncsi_br_deprecated_ips_confip=
21gbmc_ncsi_br_deprecated_ips_lastip=
22gbmc_ncsi_br_deprecated_ips_lastncsi=
23gbmc_ncsi_br_deprecated_ips_confncsi=
24
25gbmc_ncsi_br_deprecated_ips_update() {
26  [ -n "$gbmc_ncsi_br_deprecated_ips_init" ] || return
27  [ "$gbmc_ncsi_br_deprecated_ips_confip" != "$gbmc_ncsi_br_deprecated_ips_lastip" ] || \
28    [ "$gbmc_ncsi_br_deprecated_ips_confncsi" != "$gbmc_ncsi_br_deprecated_ips_lastncsi" ] || return
29  gbmc_ncsi_br_deprecated_ips_confip="$gbmc_ncsi_br_deprecated_ips_lastip"
30  gbmc_ncsi_br_deprecated_ips_confncsi="$gbmc_ncsi_br_deprecated_ips_lastncsi"
31
32  printf 'gBMC NCSI Deprecated Addrs: %s\n' \
33    "${gbmc_ncsi_br_deprecated_ips_lastip:-(deleted)}" >&2
34
35  local contents=
36  local nfcontents=
37  if [ -n "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
38    local pfx_bytes=()
39    ip_to_bytes pfx_bytes "$gbmc_ncsi_br_deprecated_ips_lastip"
40
41    local pfx="$(ip_bytes_to_str pfx_bytes)"
42    (( pfx_bytes[9] &= 0xf0 ))
43    local stateless_pfx="$(ip_bytes_to_str pfx_bytes)"
44    local stateless_ip=
45    if [ -e /sys/class/net/gbmcbr ]; then
46      local gbmcbr_mac="$(ip link show gbmcbr | tail -n 1 | awk '{print $2}')"
47      local gbmcbr_eui48="$(mac_to_eui48 "$gbmcbr_mac")"
48      stateless_ip="$(ip_pfx_concat "$stateless_pfx/80" "$gbmcbr_eui48")"
49      stateless_ip="${stateless_ip%/*}"
50    fi
51    pfx_bytes[8]=0
52    pfx_bytes[9]=0
53    local host_pfx=
54    if [ -n "${gbmc_ncsi_br_deprecated_ips_confncsi}" ]; then
55      # Only impersonate the host if we have an NCSI state machine
56      host_pfx="$(ip_bytes_to_str pfx_bytes)"
57    fi
58    read -r -d '' contents <<EOF
59[Network]
60IPv6ProxyNDP=yes
61IPv6ProxyNDPAddress=$pfx
62IPv6ProxyNDPAddress=$stateless_pfx
63${host_pfx:+IPv6ProxyNDPAddress=}$host_pfx
64${stateless_ip:+IPv6ProxyNDPAddress=}$stateless_ip
65EOF
66    read -r -d '' nfcontents <<EOF
67table inet filter {
68  chain ncsi_input {
69    ip6 saddr != $pfx/76 ip6 daddr $pfx/76 goto ncsi_gbmc_br_pub_input
70    ${host_pfx:+ip6 daddr $host_pfx/64 goto ncsi_legacy_input}
71  }
72  chain ncsi_forward {
73    ip6 saddr != $pfx/76 ip6 daddr $pfx/76 accept
74  }
75}
76EOF
77  fi
78
79  local file
80  for file in /run/systemd/network/{00,}-bmc-@NCSI_IF@.network.d/50-deprecated.conf; do
81    mkdir -p -m 755 "$(dirname "$file")"
82    if [ -z "$contents" ]; then
83      rm -f "$file"
84    else
85      printf '%s' "$contents" >"$file"
86    fi
87  done
88
89  # Ensure that systemd-networkd performs a reconfiguration as it doesn't
90  # currently check the mtime of drop-in files.
91  touch -c /etc/systemd/network/*-bmc-@NCSI_IF@.network
92
93  if [ "$(systemctl is-active systemd-networkd)" != 'inactive' ]; then
94    networkctl reload && networkctl reconfigure @NCSI_IF@
95  fi
96
97  local rfile=/run/nftables/40-gbmc-ncsi-br.rules
98  mkdir -p -m 755 "$(dirname "$rfile")"
99  if [ -z "$nfcontents" ]; then
100    rm -f "$rfile"
101  else
102    printf '%s' "$nfcontents" >"$rfile"
103  fi
104  systemctl reset-failed nftables && systemctl --no-block reload-or-restart nftables || true
105}
106
107gbmc_ncsi_br_deprecated_ips_hook() {
108  if [ "$change" = 'init' ]; then
109    gbmc_ncsi_br_deprecated_ips_init=1
110    gbmc_ip_monitor_defer
111  elif [ "$change" = 'defer' ]; then
112    gbmc_ncsi_br_deprecated_ips_update
113  elif [ "$change" = 'addr' -a "$scope" = 'global' -a "$fam" = 'inet6' ] &&
114      [ "$intf" = 'gbmcbr' -o "$intf" = '@NCSI_IF@' ] &&
115      [[ "$flags" != *deprecated* ]]; then
116    local pfx_bytes=()
117    ip_to_bytes pfx_bytes "$ip" || return
118    # No ULA Addresses
119    if (( pfx_bytes[0] & 0xfe == 0xfc )); then
120      return
121    fi
122    # We only want to allow a <pfx>::fd0x address, where x>0
123    if (( pfx_bytes[8] != 0xfd || pfx_bytes[9] & 0xf == 0 )); then
124      return
125    fi
126    for (( i = 10; i < 16; ++i )); do
127      if (( pfx_bytes[i] != 0 )); then
128        return
129      fi
130    done
131    if [ "$action" = 'add' -a "$ip" != "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
132      gbmc_ncsi_br_deprecated_ips_lastip="$ip"
133      gbmc_ip_monitor_defer
134    fi
135    if [ "$action" = 'del' -a "$ip" = "$gbmc_ncsi_br_deprecated_ips_lastip" ]; then
136      gbmc_ncsi_br_deprecated_ips_lastip=
137      gbmc_ip_monitor_defer
138    fi
139  elif [ "$change" = 'link' -a "$action" = 'add' -a "$intf" = '@NCSI_IF@' ]; then
140    if ip link show '@NCSI_IF@' | grep -q '^ *alias ncsi$'; then
141      gbmc_ncsi_br_deprecated_ips_lastncsi=1
142      gbmc_ip_monitor_defer
143    else
144      gbmc_ncsi_br_deprecated_ips_lastncsi=
145      gbmc_ip_monitor_defer
146    fi
147  fi
148}
149
150GBMC_IP_MONITOR_HOOKS+=(gbmc_ncsi_br_deprecated_ips_hook)
151
152gbmc_ncsi_br_deprecated_ips_lib=1
153