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De-duplicate handling upgraded packet and rebroadcasting logic

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GUVWAF
2025-10-05 14:03:55 +02:00
parent 775595cb37
commit de6a02756d
5 changed files with 92 additions and 119 deletions
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98
src/mesh/FloodingRouter.cpp
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@@ -31,33 +31,8 @@ bool FloodingRouter::shouldFilterReceived(const meshtastic_MeshPacket *p)
wasSeenRecently(p, true, nullptr, nullptr, &wasUpgraded); // Updates history; returns false when an upgrade is detected
// Handle hop_limit upgrade scenario for rebroadcasters
// isRebroadcaster() is duplicated in perhapsRebroadcast(), but this avoids confusing log messages
if (wasUpgraded && isRebroadcaster() && iface && p->hop_limit > 0) {
// wasSeenRecently() reports false in upgrade cases so we handle replacement before the duplicate short-circuit
// If we overhear a duplicate copy of the packet with more hops left than the one we are waiting to
// rebroadcast, then remove the packet currently sitting in the TX queue and use this one instead.
uint8_t dropThreshold = p->hop_limit; // remove queued packets that have fewer hops remaining
if (iface->removePendingTXPacket(getFrom(p), p->id, dropThreshold)) {
LOG_DEBUG("Processing upgraded packet 0x%08x for rebroadcast with hop limit %d (dropping queued < %d)", p->id,
p->hop_limit, dropThreshold);
if (nodeDB)
nodeDB->updateFrom(*p);
#if !MESHTASTIC_EXCLUDE_TRACEROUTE
if (traceRouteModule && p->which_payload_variant == meshtastic_MeshPacket_decoded_tag &&
p->decoded.portnum == meshtastic_PortNum_TRACEROUTE_APP)
traceRouteModule->processUpgradedPacket(*p);
#endif
perhapsRebroadcast(p);
// We already enqueued the improved copy, so make sure the incoming packet stops here.
return true;
}
// No queue entry was replaced by this upgraded copy, so treat it as a duplicate to avoid
// delivering the same packet to applications/phone twice with different hop limits.
seenRecently = true;
if (wasUpgraded && perhapsHandleUpgradedPacket(p)) {
return true; // we handled it, so stop processing
}
if (seenRecently) {
@@ -82,6 +57,40 @@ bool FloodingRouter::shouldFilterReceived(const meshtastic_MeshPacket *p)
return Router::shouldFilterReceived(p);
}
bool FloodingRouter::perhapsHandleUpgradedPacket(const meshtastic_MeshPacket *p)
{
// isRebroadcaster() is duplicated in perhapsRebroadcast(), but this avoids confusing log messages
if (isRebroadcaster() && iface && p->hop_limit > 0) {
// If we overhear a duplicate copy of the packet with more hops left than the one we are waiting to
// rebroadcast, then remove the packet currently sitting in the TX queue and use this one instead.
uint8_t dropThreshold = p->hop_limit; // remove queued packets that have fewer hops remaining
if (iface->removePendingTXPacket(getFrom(p), p->id, dropThreshold)) {
LOG_DEBUG("Processing upgraded packet 0x%08x for rebroadcast with hop limit %d (dropping queued < %d)", p->id,
p->hop_limit, dropThreshold);
reprocessPacket(p);
perhapsRebroadcast(p);
rxDupe++;
// We already enqueued the improved copy, so make sure the incoming packet stops here.
return true;
}
}
return false;
}
void FloodingRouter::reprocessPacket(const meshtastic_MeshPacket *p)
{
if (nodeDB)
nodeDB->updateFrom(*p);
#if !MESHTASTIC_EXCLUDE_TRACEROUTE
if (traceRouteModule && p->which_payload_variant == meshtastic_MeshPacket_decoded_tag &&
p->decoded.portnum == meshtastic_PortNum_TRACEROUTE_APP)
traceRouteModule->processUpgradedPacket(*p);
#endif
}
bool FloodingRouter::roleAllowsCancelingDupe(const meshtastic_MeshPacket *p)
{
if (config.device.role == meshtastic_Config_DeviceConfig_Role_ROUTER ||
@@ -121,41 +130,6 @@ bool FloodingRouter::isRebroadcaster()
config.device.rebroadcast_mode != meshtastic_Config_DeviceConfig_RebroadcastMode_NONE;
}
void FloodingRouter::perhapsRebroadcast(const meshtastic_MeshPacket *p)
{
if (!isToUs(p) && (p->hop_limit > 0) && !isFromUs(p)) {
if (p->id != 0) {
if (isRebroadcaster()) {
meshtastic_MeshPacket *tosend = packetPool.allocCopy(*p); // keep a copy because we will be sending it
// Use shared logic to determine if hop_limit should be decremented
if (shouldDecrementHopLimit(p)) {
tosend->hop_limit--; // bump down the hop count
} else {
LOG_INFO("favorite-ROUTER/CLIENT_BASE-to-ROUTER/CLIENT_BASE flood: preserving hop_limit");
}
#if USERPREFS_EVENT_MODE
if (tosend->hop_limit > 2) {
// if we are "correcting" the hop_limit, "correct" the hop_start by the same amount to preserve hops away.
tosend->hop_start -= (tosend->hop_limit - 2);
tosend->hop_limit = 2;
}
#endif
tosend->next_hop = NO_NEXT_HOP_PREFERENCE; // this should already be the case, but just in case
LOG_INFO("Rebroadcast received floodmsg");
// Note: we are careful to resend using the original senders node id
send(tosend);
} else {
LOG_DEBUG("No rebroadcast: Role = CLIENT_MUTE or Rebroadcast Mode = NONE");
}
} else {
LOG_DEBUG("Ignore 0 id broadcast");
}
}
}
void FloodingRouter::sniffReceived(const meshtastic_MeshPacket *p, const meshtastic_Routing *c)
{
bool isAckorReply = (p->which_payload_variant == meshtastic_MeshPacket_decoded_tag) &&