1 files changed, 92 insertions, 0 deletions
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-from-ra.sh b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-from-ra.sh
new file mode 100644
index 000000000..9a5586b8a
--- /dev/null
+++ b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-from-ra.sh
@@ -0,0 +1,92 @@
+# 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.
+
+[ -z "${gbmc_br_from_ra_lib-}" ] || return
+
+source /usr/share/network/lib.sh || exit
+
+gbmc_br_from_ra_init=
+gbmc_br_from_ra_mac=
+declare -A gbmc_br_from_ra_pfxs=()
+declare -A gbmc_br_from_ra_prev_addrs=()
+
+gbmc_br_from_ra_update() {
+  [ -n "$gbmc_br_from_ra_init" -a -n "$gbmc_br_from_ra_mac" ] || return
+
+  local pfx
+  for pfx in "${!gbmc_br_from_ra_pfxs[@]}"; do
+    local cidr
+    if ! cidr="$(ipv6_pfx_to_cidr "$pfx")"; then
+      unset 'gbmc_br_from_ra_pfxs[$pfx]'
+      continue
+    fi
+    if (( cidr == 80 )); then
+      local sfx
+      if ! sfx="$(mac_to_eui48 "$gbmc_br_from_ra_mac")"; then
+        unset 'gbmc_br_from_ra_pfxs[$pfx]'
+        continue
+      fi
+      local addr
+      addr="$(ipv6_pfx_concat "$pfx" "$sfx")"
+    else
+      continue
+    fi
+    local valid="${gbmc_br_from_ra_pfxs["$pfx"]}"
+    if (( valid > 0 )); then
+      if [ -z "${gbmc_br_from_ra_prev_addrs["$addr"]-}" ]; then
+        echo "gBMC Bridge RA Addr Add: $addr" >&2
+        gbmc_br_from_ra_prev_addrs["$addr"]=1
+      fi
+      ip addr replace "$addr" dev gbmcbr noprefixroute
+    else
+      if [ -n "${gbmc_br_from_ra_prev_addrs["$addr"]-}" ]; then
+        echo "gBMC Bridge RA Addr Del: $addr" >&2
+        unset 'gbmc_br_from_ra_prev_addrs[$addr]'
+      fi
+      ip addr del "$addr" dev gbmcbr
+      unset 'gbmc_br_from_ra_pfxs[$pfx]'
+    fi
+  done
+}
+
+gbmc_br_from_ra_hook() {
+  if [ "$change" = 'init' ]; then
+    gbmc_br_from_ra_init=1
+    gbmc_br_from_ra_update
+  elif [[ "$change" == 'route' && "$route" != *' via '* ]] &&
+       [[ "$route" =~ ^(.* dev gbmcbr proto ra .*)( +expires +([^ ]+)sec).*$ ]]; then
+    pfx="${route%% *}"
+    if [ "$action" = 'add' ]; then
+      gbmc_br_from_ra_pfxs["$pfx"]="${BASH_REMATCH[3]}"
+      gbmc_br_from_ra_update
+    elif [ "$action" = 'del' ]; then
+      gbmc_br_from_ra_pfxs["$pfx"]=0
+      gbmc_br_from_ra_update
+    fi
+  elif [ "$change" = 'link' -a "$intf" = 'gbmcbr' ]; then
+    rdisc6 -m gbmcbr -r 1 -w 100 >/dev/null 2>&1
+    if [ "$action" = 'add' -a "$mac" != "$gbmc_br_from_ra_mac" ]; then
+      gbmc_br_from_ra_mac="$mac"
+      gbmc_br_from_ra_update
+    fi
+    if [ "$action" = 'del' -a "$mac" = "$gbmc_br_from_ra_mac" ]; then
+      gbmc_br_from_ra_mac=
+      gbmc_br_from_ra_update
+    fi
+  fi
+}
+
+GBMC_IP_MONITOR_HOOKS+=(gbmc_br_from_ra_hook)
+
+gbmc_br_from_ra_lib=1