1 files changed, 87 insertions, 0 deletions
diff --git a/src/system/on-dhcpv6-event.sh b/src/system/on-dhcpv6-event.sh
new file mode 100755
index 000000000..cbb370999
--- /dev/null
+++ b/src/system/on-dhcpv6-event.sh
@@ -0,0 +1,87 @@
+#!/bin/bash
+#
+# Copyright (C) 2024 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#
+
+if [ $# -lt 1 ]; then
+  echo Invalid args
+  logger -s -t on-dhcpv6-event "Invalid args \"$@\""
+  exit 1
+fi
+
+action=$1
+
+case "$action" in
+  lease6_renew|lease6_recover)
+    exit 0
+    ;;
+
+  lease6_release|lease6_expire|lease6_decline)
+    ifname=$QUERY6_IFACE_NAME
+    lease_addr=$LEASE6_ADDRESS
+    lease_prefix_len=$LEASE6_PREFIX_LEN
+
+    if [[ "$LEASE6_TYPE" != "IA_PD" ]]; then
+      exit 0
+    fi
+
+    logger -s -t on-dhcpv6-event "Processing route deletion for ${lease_addr}/${lease_prefix_len}"
+    route_cmd="sudo -n /sbin/ip -6 route del ${lease_addr}/${lease_prefix_len}"
+
+    # the ifname is not always present, like in LEASE6_VALID_LIFETIME=0 updates,
+    # but 'route del' works either way. Use interface only if there is one.
+    if [[ "$ifname" != "" ]]; then
+        route_cmd+=" dev ${ifname}"
+    fi
+    route_cmd+=" proto static"
+    eval "$route_cmd"
+
+    exit 0
+    ;;
+
+  leases6_committed)
+    for ((i = 0; i < $LEASES6_SIZE; i++)); do
+      ifname=$QUERY6_IFACE_NAME
+      requester_link_local=$QUERY6_REMOTE_ADDR
+      lease_type_var="LEASES6_AT${i}_TYPE"
+      lease_ip_var="LEASES6_AT${i}_ADDRESS"
+      lease_prefix_len_var="LEASES6_AT${i}_PREFIX_LEN"
+
+      lease_type=${!lease_type_var}
+
+      if [[ "$lease_type" != "IA_PD" ]]; then
+        continue
+      fi
+
+      lease_ip=${!lease_ip_var}
+      lease_prefix_len=${!lease_prefix_len_var}
+
+      logger -s -t on-dhcpv6-event "Processing PD route for ${lease_addr}/${lease_prefix_len}. Link local: ${requester_link_local} ifname: ${ifname}"
+      
+      sudo -n /sbin/ip -6 route replace ${lease_ip}/${lease_prefix_len} \
+        via ${requester_link_local} \
+        dev ${ifname} \
+        proto static
+    done
+
+    exit 0
+    ;;
+
+  *)
+    logger -s -t on-dhcpv6-event "Invalid command \"$1\""
+    exit 1
+    ;;
+esac