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net/tcp: support OTW SEQ number check in SYN-RCVD state

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According rfc793 p69, In SYN-RCVD state, if the incoming segment is not acceptable, an acknowledgment should be sent in reply (unless the RST bit is set):
<SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>

Signed-off-by: wenquan1 <wenquan1@xiaomi.com>
This commit is contained in:
wenquan1
2025-08-18 21:25:37 +08:00
committed by archer
parent ee5009295c
commit 758b6dd847
5 changed files with 0 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/tcp/tcp.h
-3
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@@ -212,10 +212,7 @@ struct tcp_conn_s
uint8_t rcvseq[4]; /* The sequence number that we expect to
* receive next */
uint8_t sndseq[4]; /* The sequence number that was last sent by us */
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS) || \
defined(CONFIG_NET_SENDFILE)
uint32_t rexmit_seq; /* The sequence number to be retrasmitted */
#endif
uint8_t crefs; /* Reference counts on this instance */
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
uint8_t domain; /* IP domain: PF_INET or PF_INET6 */
net/tcp/tcp_conn.c
-4
View File
@@ -1144,9 +1144,7 @@ FAR struct tcp_conn_s *tcp_alloc_accept(FAR struct net_driver_s *dev,
conn->tcpstateflags = TCP_SYN_RCVD;
tcp_initsequence(conn);
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
conn->rexmit_seq = tcp_getsequence(conn->sndseq);
#endif
conn->tx_unacked = 1;
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
@@ -1470,9 +1468,7 @@ int tcp_connect(FAR struct tcp_conn_s *conn, FAR const struct sockaddr *addr)
/* Save initial sndseq to rexmit_seq, otherwise it will be zero */
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
conn->rexmit_seq = tcp_getsequence(conn->sndseq);
#endif
#ifdef CONFIG_NET_TCP_CC_NEWRENO
/* Initialize the variables of congestion control. */
net/tcp/tcp_input.c
-4
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@@ -1327,11 +1327,7 @@ skip_rtt:
if ((tcp->flags & TCP_CTL) == TCP_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_ACK | TCP_SYN);
return;
}
net/tcp/tcp_send.c
-4
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@@ -238,7 +238,6 @@ static void tcp_sendcommon(FAR struct net_driver_s *dev,
g_netstats.tcp.sent++;
#endif
#if !defined(CONFIG_NET_TCP_WRITE_BUFFERS)
if ((tcp->flags & (TCP_SYN | TCP_FIN)) != 0)
{
/* Remember sndseq that will be used in case of a possible
@@ -253,9 +252,6 @@ static void tcp_sendcommon(FAR struct net_driver_s *dev,
net_incr32(conn->sndseq, 1);
}
#else
/* REVISIT for the buffered mode */
#endif
}
/****************************************************************************
net/tcp/tcp_timer.c
-12
View File
@@ -602,11 +602,7 @@ 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;
@@ -614,11 +610,7 @@ 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;
@@ -659,11 +651,7 @@ 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;
}