#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <linux/sockios.h>
#include <linux/if.h>
#include <linux/ethtool.h>

int main (int argc, char **argv)
{
    int sock;
    struct ifreq ifr;
    struct ethtool_value eval;
    int rc;

    if (argc < 2) {
        fprintf(stderr, "Usage: tx-chksum-off <device>\n");
        exit(1);
    }

    sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
    if (sock < 0) {
        perror("socket");
        exit(1);
    }

    strncpy(ifr.ifr_name, argv[1], sizeof(ifr.ifr_name));
    ifr.ifr_data = &eval;

    eval.cmd  = ETHTOOL_STXCSUM;
    eval.data = 0;

    rc = ioctl(sock, SIOCETHTOOL, &ifr);
    if (rc < 0) {
        perror("ioctl");
        exit(1);
    }

    return (0);
}