/*
protocol_misc.c -- handle the meta-protocol, miscellaneous functions
Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2013 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2022 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "address_cache.h"
#include "connection.h"
+#include "crypto.h"
#include "logger.h"
#include "meta.h"
#include "net.h"
#include "protocol.h"
#include "utils.h"
-#ifndef MIN
-#define MIN(x, y) (((x)<(y))?(x):(y))
-#endif
-
int maxoutbufsize = 0;
int mtu_info_interval = 5;
int udp_info_interval = 5;
return true;
}
+static bool random_early_drop(connection_t *c) {
+ if(c->outbuf.len > (size_t)maxoutbufsize / 2) {
+ if((c->outbuf.len - (size_t)maxoutbufsize / 2) > prng((size_t)maxoutbufsize / 2)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
/* Sending and receiving packets via TCP */
bool send_tcppacket(connection_t *c, const vpn_packet_t *packet) {
/* If there already is a lot of data in the outbuf buffer, discard this packet.
We use a very simple Random Early Drop algorithm. */
- if(2.0 * c->outbuf.len / (float)maxoutbufsize - 1 > (float)rand() / (float)RAND_MAX) {
+ if(random_early_drop(c)) {
return true;
}
bool tcppacket_h(connection_t *c, const char *request) {
short int len;
- if(sscanf(request, "%*d %hd", &len) != 1) {
+ if(sscanf(request, "%*d %hd", &len) != 1 || len < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "PACKET", c->name,
c->hostname);
return false;
/* If there already is a lot of data in the outbuf buffer, discard this packet.
We use a very simple Random Early Drop algorithm. */
- if(2.0 * c->outbuf.len / (float)maxoutbufsize - 1 > (float)rand() / (float)RAND_MAX) {
+ if(random_early_drop(c)) {
return true;
}
- if(!send_request(c, "%d %zu", SPTPS_PACKET, len)) {
+ if(!send_request(c, "%d %lu", SPTPS_PACKET, (unsigned long)len)) {
return false;
}
bool sptps_tcppacket_h(connection_t *c, const char *request) {
short int len;
- if(sscanf(request, "%*d %hd", &len) != 1) {
+ if(sscanf(request, "%*d %hd", &len) != 1 || len < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "SPTPS_PACKET", c->name,
c->hostname);
return false;