mirror of
https://github.com/transmission/transmission
synced 2024-12-23 00:04:06 +00:00
53 lines
1.8 KiB
Diff
53 lines
1.8 KiB
Diff
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diff --git a/utp.cpp b/utp.cpp
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--- a/utp.cpp
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+++ b/utp.cpp
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@@ -1487,6 +1487,8 @@
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return acked_bytes;
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}
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+enum { MAX_EACK = 128 };
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+
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void UTPSocket::selective_ack(uint base, const byte *mask, byte len)
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{
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if (cur_window_packets == 0) return;
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@@ -1499,7 +1501,7 @@
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// resends is a stack of sequence numbers we need to resend. Since we
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// iterate in reverse over the acked packets, at the end, the top packets
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// are the ones we want to resend
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- int resends[32];
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+ int resends[MAX_EACK];
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int nr = 0;
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LOG_UTPV("0x%08x: Got EACK [%032b] base:%u", this, *(uint32*)mask, base);
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@@ -1572,6 +1574,12 @@
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if (((v - fast_resend_seq_nr) & ACK_NR_MASK) <= OUTGOING_BUFFER_MAX_SIZE &&
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count >= DUPLICATE_ACKS_BEFORE_RESEND &&
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duplicate_ack < DUPLICATE_ACKS_BEFORE_RESEND) {
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+ // resends is a stack, and we're mostly interested in the top of it
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+ // if we're full, just throw away the lower half
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+ if (nr >= MAX_EACK - 2) {
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+ memmove(resends, &resends[MAX_EACK/2], MAX_EACK/2 * sizeof(resends[0]));
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+ nr -= MAX_EACK / 2;
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+ }
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resends[nr++] = v;
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LOG_UTPV("0x%08x: no ack for %u", this, v);
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} else {
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@@ -1580,13 +1588,12 @@
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}
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} while (--bits >= -1);
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- if (((base - 1 - fast_resend_seq_nr) & ACK_NR_MASK) < 256 &&
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- count >= DUPLICATE_ACKS_BEFORE_RESEND &&
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- duplicate_ack < DUPLICATE_ACKS_BEFORE_RESEND) {
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+ if (((base - 1 - fast_resend_seq_nr) & ACK_NR_MASK) <= OUTGOING_BUFFER_MAX_SIZE &&
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+ count >= DUPLICATE_ACKS_BEFORE_RESEND) {
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// if we get enough duplicate acks to start
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// resending, the first packet we should resend
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// is base-1
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- resends[nr++] = base - 1;
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+ resends[nr++] = (base - 1) & ACK_NR_MASK;
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} else {
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LOG_UTPV("0x%08x: not resending %u count:%d dup_ack:%u fast_resend_seq_nr:%u",
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this, base - 1, count, duplicate_ack, fast_resend_seq_nr);
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