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tcp_input: Don't put back sndseq on an old ack

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YAMAMOTO Takashi 2021-07-27 13:55:04 +09:00 committed by Xiang Xiao
parent e53f989997
commit b815a2c3a8
1 changed files with 10 additions and 5 deletions
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5
net/tcp/tcp_input.c
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@ -582,6 +582,7 @@ found:
{ {
uint32_t unackseq; uint32_t unackseq;
uint32_t ackseq; uint32_t ackseq;
uint32_t sndseq;
/* The next sequence number is equal to the current sequence /* The next sequence number is equal to the current sequence
* number (sndseq) plus the size of the outstanding, unacknowledged * number (sndseq) plus the size of the outstanding, unacknowledged
@ -639,11 +640,15 @@ found:
* be beyond ackseq. * be beyond ackseq.
*/ */
sndseq = tcp_getsequence(conn->sndseq);
if (TCP_SEQ_LT(sndseq, ackseq))
{
ninfo("sndseq: %08" PRIx32 "->%08" PRIx32 ninfo("sndseq: %08" PRIx32 "->%08" PRIx32
" unackseq: %08" PRIx32 " new tx_unacked: %" PRId32 "\n", " unackseq: %08" PRIx32 " new tx_unacked: %" PRId32 "\n",
tcp_getsequence(conn->sndseq), ackseq, unackseq, tcp_getsequence(conn->sndseq), ackseq, unackseq,
(uint32_t)conn->tx_unacked); (uint32_t)conn->tx_unacked);
tcp_setsequence(conn->sndseq, ackseq); tcp_setsequence(conn->sndseq, ackseq);
}
/* Do RTT estimation, unless we have done retransmissions. */ /* Do RTT estimation, unless we have done retransmissions. */