Re: sending MAC packets

[Ben Greear <greearb () candelatech com>]

M. Onur ERGiN wrote:
> Hi, 
> I need to send some pure ethernet frames, I mean:
>
> Ethernet Header | Ethernet Payload(my data only)
>
> I want to send this structure from user space.
> Do you know any libraries or any primitives helping to
> do this?
>
> Onur.

On linux, use packet-sockets:

man packet


Here is some example code that creates a packet socket:

int createPacketSocket(const char* dev_name, int ether_type, int dev_idx, int should_bind) {
   LF_TRC_IN_NT;
   VLOG_INF(VLOG << "createPacketSocket:  dev_name -:" << dev_name << ":- dev_idx: " << dev_idx
            << " type (decimal): " << ether_type << endl);

   int s = socket(PF_PACKET, SOCK_RAW, htons(ether_type));
   int r; //retval

   if (s < 0) {
      cerr << "ERROR: socket:  " << strerror(errno) << endl;
      VLOG << "ERROR: socket:  " << strerror(errno) << endl;
      return s;
   }

   if (should_bind) {
      struct sockaddr_ll myaddr;

      memset(&myaddr, '\0', sizeof(myaddr));
      myaddr.sll_family = AF_PACKET;
      myaddr.sll_protocol = htons(ether_type);
      myaddr.sll_ifindex = dev_idx;
      //strcpy(myaddr.sa_data, dev_name);

      r = bind(s, (struct sockaddr*)(&myaddr), sizeof(myaddr));
      if (r < 0) {
         cerr << "ERROR: bind:  " << strerror(errno) << endl;
         VLOG << "ERROR: bind:  " << strerror(errno) << endl;
         return r;
      }
   }

   nonblock(s);
   return s;
}


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--
Ben Greear <greearb () candelatech com>
Candela Technologies Inc  http://www.candelatech.com


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