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tcp_input.c: standardize the processing of urgent data #17899

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Merged
acassis merged 1 commit into from
Jan 15, 2026
Merged

tcp_input.c: standardize the processing of urgent data #17899

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28 changes: 1 addition & 27 deletions net/tcp/tcp_input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1600,33 +1600,7 @@ static void tcp_input(FAR struct net_driver_s *dev, uint8_t domain,
}

#else /* CONFIG_NET_TCPURGDATA */
/* Check the URG flag. If this is set, We must gracefully ignore
* and discard the urgent data.
*/

if ((tcp->flags & TCP_URG) != 0)
{
uint16_t urglen = (tcp->urgp[0] << 8) | tcp->urgp[1];
if (urglen > dev->d_len)
{
/* There is more urgent data in the next segment to come. */

urglen = dev->d_len;
}

/* The d_len field contains the length of the incoming data;
* The d_appdata field points to the any "normal" data that
* may follow the urgent data.
*
* NOTE: If the urgent data continues in the next packet, then
* d_len will be zero and d_appdata will point past the end of
* the payload (which is OK).
*/

net_incr32(conn->rcvseq, urglen);
dev->d_len -= urglen;
dev->d_appdata += urglen;
}
/* Urgent data needs to be treated as normal data */
#endif /* CONFIG_NET_TCPURGDATA */

#ifdef CONFIG_NET_TCP_KEEPALIVE
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