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[#1307] kea-dhcp4 now enforces parked-packet-limit

Browse Source 
src/bin/dhcp4/dhcp4_srv.cc
    Dhcpv4Srv::processDhcp4Query() - now drops packet and response
    if parking lot size reaches parked-packet-limit

src/bin/dhcp4/dhcp4_messages.*
    DHCP4_HOOK_LEASES4_PARKING_LOT_FULL - new message
This commit is contained in:
Thomas Markwalder
2021-09-03 08:26:38 -04:00
parent f914dd9c96
commit f14163b51e
4 changed files with 36 additions and 0 deletions
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25
src/bin/dhcp4/dhcp4_srv.cc
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@@ -1356,6 +1356,31 @@ Dhcpv4Srv::processDhcp4Query(Pkt4Ptr& query, Pkt4Ptr& rsp,
callout_handle->setArgument("deleted_leases4", deleted_leases);
if (allow_packet_park) {
// Get the parking limit. Parsing should ensure the value is present.
uint32_t parked_packet_limit = 0;
data::ConstElementPtr ppl = CfgMgr::instance().
getCurrentCfg()->getConfiguredGlobal("parked-packet-limit");
if (ppl) {
parked_packet_limit = ppl->intValue();
}
if (parked_packet_limit) {
const auto& parking_lot = ServerHooks::getServerHooks().
getParkingLotPtr("leases4_committed");
if (parking_lot && (parking_lot->size() >= parked_packet_limit)) {
// We can't park it so we're going to throw it on the floor.
LOG_DEBUG(packet4_logger, DBGLVL_PKT_HANDLING,
DHCP4_HOOK_LEASES4_PARKING_LOT_FULL)
.arg(parked_packet_limit)
.arg(query->getLabel());
isc::stats::StatsMgr::instance().addValue("pkt4-receive-drop",
static_cast<int64_t>(1));
rsp.reset();
return;
}
}
// We proactively park the packet. We'll unpark it without invoking
// the callback (i.e. drop) unless the callout status is set to
// NEXT_STEP_PARK. Otherwise the callback we bind here will be