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Safety fixes to RFC3742

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This commit is contained in:
Mike Perry 2022-12-15 22:03:26 +00:00
parent b7759403bf
commit 90e67f34a7
1 changed files with 9 additions and 4 deletions
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13
src/core/or/congestion_control_vegas.c
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@ -283,8 +283,11 @@ rfc3742_ss_inc(const congestion_control_t *cc)
// => K = 2*cwnd/max_ssthresh
// cwnd += int(MSS/K);
// => cwnd += MSS*max_ssthresh/(2*cwnd)
return ((uint64_t)cc->sendme_inc*cc->vegas_params.ss_cwnd_cap + cc->cwnd)/
(2*cc->cwnd);
// Return at least 1 for inc.
return MAX(
((uint64_t)cc->sendme_inc*cc->vegas_params.ss_cwnd_cap + cc->cwnd)/
(2*cc->cwnd),
1);
}
}
@ -447,8 +450,10 @@ congestion_control_vegas_process_sendme(congestion_control_t *cc,
cc->cwnd += inc;
// Check if inc is less than what we would do in steady-state
// avoidance
if (inc*SENDME_PER_CWND(cc) <= CWND_INC(cc)) {
// avoidance. Note that this is likely never to happen
// in practice, but we keep this block and the metrics to make
// sure.
if (inc*SENDME_PER_CWND(cc) <= CWND_INC(cc)*cc->cwnd_inc_rate) {
congestion_control_vegas_exit_slow_start(circ, cc);
cc_stats_vegas_below_ss_inc_floor++;