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Bind() with SO_BINDTODEVICE returns errno 125

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Top Forums UNIX for Advanced & Expert Users Bind() with SO_BINDTODEVICE returns errno 125
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Old 05-30-2018
Bind() with SO_BINDTODEVICE returns errno 125

I am setting the socket option SO_BINDTODEVICE for eth0 to be able to route the packets only through that interface. However, bind() fails with "Port already in use" error with this option when the server is restarted despite having the socket option SO_REUSEADDR.

Here is my code snippet:

int listenFd;
    int temp;
    int buf_size = 0;
    struct sockaddr_in sAddr;
    int enable = 1;
    struct ifreq ifr;

    /* setup listening socket */
    listenFd = socket(AF_INET, SOCK_STREAM, 0);
    if (setsockopt(listenFd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0)
       close (listenFd);
       return -1;

    memset(&ifr, 0, sizeof(ifr));
    snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "eth0");
    ioctl(listenFd, SIOCGIFINDEX, &ifr);
    if (setsockopt(listenFd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, IFNAMSIZ) < 0)
      close (listenFd);
      return -1;

    /* Initialize the server address and bind to the required port */
    memset(&sAddr, 0, sizeof (struct sockaddr_in));
    sAddr.sin_family = AF_INET;
    sAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    sAddr.sin_port = 8080;

    /* bind to the socket, */
    temp = bind(listenFd, (struct sockaddr*) &sAddr, sizeof (sAddr));
    if (temp < 0)
      close (listenFd);
      return -1;

    /* Set socket options to max buffer size */
    temp = setsockopt(listenFd, SOL_SOCKET, SO_RCVBUF, &buf_size, sizeof(buf_size));
    if (temp < 0)
      close (listenFd);
      return -1;

Is anything missing in the code above? I have tried the other way of getting IP address of the interface (eth0) and assigning it to sAddr.sin_addr.s_addr but that did not work.

Hope to get some details. Thanks in advance!!

Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 05-30-2018 at 10:51 AM.. Reason: Added CODE tags.

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