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net/tcp(unbuffered): advance sndseq by +1 because SYN and FIN occupy one sequence number (RFC 793)

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This commit is contained in:
Alexander Lunev
2022-01-02 18:53:43 +03:00
committed by Masayuki Ishikawa
parent d23ad9b9b0
commit e9ab3adf23
3 changed files with 39 additions and 0 deletions
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net/tcp/tcp_timer.c
+15
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@@ -317,6 +317,11 @@ void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
* SYNACK.
*/
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
tcp_setsequence(conn->sndseq, conn->rexmit_seq);
#else
/* REVISIT for the buffered mode */
#endif
tcp_synack(dev, conn, TCP_ACK | TCP_SYN);
goto done;
@@ -324,6 +329,11 @@ void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
/* In the SYN_SENT state, we retransmit out SYN. */
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
tcp_setsequence(conn->sndseq, conn->rexmit_seq);
#else
/* REVISIT for the buffered mode */
#endif
tcp_synack(dev, conn, TCP_SYN);
goto done;
@@ -344,6 +354,11 @@ void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
/* In all these states we should retransmit a FINACK. */
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
tcp_setsequence(conn->sndseq, conn->rexmit_seq);
#else
/* REVISIT for the buffered mode */
#endif
tcp_send(dev, conn, TCP_FIN | TCP_ACK, hdrlen);
goto done;
}