How To Fix TCP C Checksum Error

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    Sometimes your system may display an error code indicating the program with the tcp checksum. There can be many reasons for this error.

    I’ve been having trouble generating a checksum for TCP for several days. I have looked at many solutions on the internet, but for the examples I have used, we are going to show you how to create a TCP checksum. I felt like I was reading the RFC document too and I am really having problems:

    tcp checksum c program

    Below is the code I am using to enter the checksum:

      unsigned short checksum (fourth unsigned short buffer, whole bytes)    long unsigned sum = 0;    unsigned short answer - 0;    int just put i = bytes;    while (i> 0)                Sum + = * buffer;            Buffer + = 1;            i- = 2;        total = (total >> 16) + (total & htonl (0x0000ffff));    add + = (sum >> 16);    ~ Full back; 

    The following is often the structure I created for my TCP header:

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  •   struct tcp_header    unsigned ultrashort tcp_sprt;    small unsigned tcp_dprt;    unsigned int tcp_seq;    unsigned int tcp_ack;    unsigned character tcp_res: 4;    unsigned character tcp_off: 4;    unsigned character tcp_flags;    simple unsigned tcp_win;    unsigned tcp_csum;    unsigned low tcp_urp;; 

    I’ve used Wireshark to test these packets and the only thing that’s usually wrong is the checksum.

    tcp checksum c program

    Finally, here is the pseudo-header structure I’m currently loading with a TCP header and someone’s IP header information:

      struct pseudoTcpHeader    unsigned int ip_src;    int ip_dst unsigned;    unsigned null character; // always zero    unsigned character protocol; // equals 6; // for tcp    rather short unsigned tcp_len;    struct tcp_header tcph;; 

    Once I load this structure with the correct information, in this case I use the checksum function for the whole pseudo-header structure and delegate the TCP checksum with the best value. Do you see something wrong with what I have provided? As long as there is no problem, it might be a frivolous error I just saw.

     / * Set internet checksum for specific IP header * /void compute_ip_checksum (struct ipdr * ipdrp)  iphdrp-> check is 0;  iphdrp-> check = compute_checksum ((unsigned short *) iphdrp, iphdrp-> ihl << 2);/ * Calculate the checksum for the number of ba  tov initialized for addr using one's complement's complement * /static unsigned temporary compute_checksum (unsigned short * addr, unsigned int count)  long unsigned total is 0;  during (number> 1)    Cost + = * adr ++;    track - = 2;    // If there are many bytes left, fill and add the exact bytes  if (quantity> 0)    Total + = ((* addr) & htons (0xFF00));    // Roll up the dollar amount into 16 bits: add a carrier to help you with the result  within (amount >> 16)      Amount means (sum & 0xffff) + (sum >> 16);    // add  Amount = ~ Amount;  return using (amount (unsigned short));
     / * set tcp checksum: assign IP header and TCP message * /void compute_tcp_checksum (struct iphdr * pIph, unsigned easy * ipPayload)    Query for unsigned long total = 0;    unsigned short tcpLen equals ntohs (pIph-> tot_len) - (pIph-> ihl << 2);    struct tcphdr * tcphdrp = (struct tcphdr *) (ipPayload);    // Add pseudo headers    // IP-address of the educational resource    some + = (pIph-> saddr >> 16) & 0xFFFF;    Count + = (pIph-> saddr) & 0xFFFF;    // destination IP address    Value + = (pIph-> daddr >> 16) & 0xFFFF;    Area + = (pIph-> daddr) & 0xFFFF;    // The protocol is reserved as follows zom: 6    Range + = Htons (IPPROTO_TCP);    // duration    Payment + = htons (tcpLen);     // add the payload of the person's IP    // Initialize the checksum to 0    tcphdrp-> check = 0;    while (tcpLen> 1)        Amount + = * ipPayload ++;        tcpLen - = 2;        // If there are only bytes left, fill in additional bytes, add    if (tcpLen> 0)        // printf ("++++++++++++ Padding,% dn", tcpLen);        Sum + = ((* ipPayload) & htons (0xFF00));          // Add the sum of 32 bits over 12 bits: add the carrier to the result      simultaneously (sum >> 16)          The sum is (sum & 0xffff) + (sum >> 16);            Amount = ~ Amount;    // Determine the result of the calculation    tcphdrp-> check = (short unsigned) amount;
     / * specified TCP checksum: specified IP header and UDP datagram * /void compute_udp_checksum (struct iphdr * pIph, unsigned fast * ipPayload) {    Create an unsigned long total score of 0;    struct udphdr * implies udphdrp (struct udphdr *) (ipPayload);    unsigned short udpLen = htons (udphdrp-> len);    // printf ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~ udp len =% dn", udpLen);    // Add pseudo headers    // printf ("add a pseudo-header");    // received ip    Price + = (pIph-> saddr >> 16) & 0xFFFF;    some + = (pIph-> saddr) & 0xFFFF;    // destination IP address    Summoney + = (pIph-> daddr >> 16) & 0xFFFF;    USD Amount + = (pIph-> daddr) & 0xFFFF;    // Protocol and therefore reserved: 17    Amount + = tons (IPPROTO_UDP);    // duration    Total amount + = udphdrp-> len;     // add the IP payload    // printf ("Add IP Payload");    // Initialize the checksum to 0    udphdrp-> check = 0;    while (udpLen> 1)        Amount + = * ipPayload ++;        udpLen - = 2;        // If there are only bytes left, fill in the bytes that need to be added    if (udpLen> 0)        // printf ("++++++++++++++++++ Padding:% dn", udpLen);        Sum + = ((* ipPayload) & htons (0xFF00));          // Add up to a total of 16 pieces: add a transporter to the result    // printf ("add transporter");      within (amount >> 16)          Sum = (sum & 0xffff) + (sum >> 16);          // printf ("add-on");      Sum of matches ~ sum;    // Determine the result of the formula    udphdrp-> check equals ((unsigned short) sum == 0x0000)? 0xFFFF: (short unsigned) amount; 

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    Sometimes your system may display an error code indicating the program with the tcp checksum. There can be many reasons for this error. I’ve been having trouble generating a checksum for TCP for several days. I have looked at many solutions on the internet, but for the examples I have used, we are going to…

    Sometimes your system may display an error code indicating the program with the tcp checksum. There can be many reasons for this error. I’ve been having trouble generating a checksum for TCP for several days. I have looked at many solutions on the internet, but for the examples I have used, we are going to…