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net/tcp: ignore a segment carrying an unacceptable ACK and RST in syn-send state

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Ignore a segment carrying an unacceptable ACK and RST in syn-send state

Signed-off-by: wenquan1 <wenquan1@xiaomi.com>
This commit is contained in:
wenquan1
2025-09-04 20:52:43 +08:00
committed by archer
parent 62f8c400b6
commit 12de7e6dd5
1 changed files with 27 additions and 0 deletions
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net/tcp/tcp_input.c
+27
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@@ -750,6 +750,33 @@ static void tcp_input(FAR struct net_driver_s *dev, uint8_t domain,
seq = tcp_getsequence(tcp->seqno);
rcvseq = tcp_getsequence(conn->rcvseq);
/* rfc793:
* "If the state is SYN-SENT then
* first check the ACK bit
* If the ACK bit is set
* If SEG.ACK =< ISS, or SEG.ACK > SND.NXT, send
* a reset (unless the RST bit is set, if so drop
* the segment and return)"
*/
if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_SYN_SENT)
{
uint32_t ackseq;
if ((tcp->flags & TCP_ACK) != 0)
{
ackseq = tcp_getsequence(tcp->ackno);
if (ackseq != tcp_getsequence(conn->sndseq))
{
if ((tcp->flags & TCP_RST) != 0)
{
goto drop;
}
goto reset;
}
}
}
/* RFC793, 1) page 37 Reset Processing: "In all states except
* SYN-SENT, all reset (RST) segments are validated by checking
* their SEQ-fields."