Dear Support:
As we know, the tcp/ip stack in mqx4.1 has check the TCP Grammar Header in function TCP_Process_packet() in Tcp.c.
the tcp header include:
/* Header of a TCP packet
*/
typedef struct tcp_header { /* see RFC sec.3.1 */
unsigned char source_port[2]; /* source TCP port number */
unsigned char dest_port[2]; /* destination TCP port number */
unsigned char seq[4]; /* of 1st data octet or 1st-1 if (flags & SYN)*/
unsigned char ack[4]; /* valid if (flags & ACK) */
unsigned char flags[2]; /* see flags values above */
unsigned char window[2]; /* nb of bytes recipient of packet can send */
unsigned char checksum[2]; /* (see RFC) */
unsigned char urgent[2]; /* offset from seq, valid if (flags & URG) */
/* then follow options in 4-byte multiples, */
/* then data */
} TCP_HEADER, * TCP_HEADER_PTR; /* 20 bytes */
the processing of the received packet is just check the flags in the source code like below:
if ( ((flags & SYN) && (flags & FIN)) ||
(flags == FIN) ||
(flags == 0) ) {
TCP_PP_DROP;
}
my question is if the other data in the structure of tcp header is not valid, and the processing is not do the checking, can it be something wrong happen?
If I want to do the all tcp header data check? how can I to do it?
BR,
