Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / verif / env / common / vera / niu_ippktgen / C / libnet / src / libnet_build_pim.c

#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#if (!(_WIN32) || (__CYGWIN__)) 
#include "../include/libnet.h"
#else
#include "../include/win32/libnet.h"
#endif

libnet_ptag_t
libnet_build_pim(u_int8_t vers, u_int8_t type, u_int16_t chksum,
                u_int8_t *payload, u_int32_t payload_s, libnet_t *l,
                libnet_ptag_t ptag)
{
   u_int32_t n, h;
   libnet_pblock_t *p;
   struct libnet_pim_hdr pim_hdr;

   if (l == NULL)
   { 
       return (-1);
   }

   n = LIBNET_PIM_H + payload_s;
   h = LIBNET_PIM_H;

   /*
    *  Find the existing protocol block if a ptag is specified, or create
    *  a new one.
    */
   p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_PIM_H);
   if (p == NULL)
   {
       return (-1);
   }

   memset(&pim_hdr, 0, sizeof(pim_hdr));
   pim_hdr.pim_ver_type = (vers << 4) | (type & 0x0f); /* version and type */
   pim_hdr.pim_sum = (chksum ? htons(chksum) : 0);   /* checksum */ 

   n = libnet_pblock_append(l, p, (u_int8_t *)&pim_hdr, LIBNET_PIM_H);
   if (n == -1)
   {
       goto bad;
   }

   if ((payload && !payload_s) || (!payload && payload_s))
   {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                            "%s(): payload inconsistency\n", __func__);
       goto bad;
   }

   if (payload && payload_s)
   {
       n = libnet_pblock_append(l, p, payload, payload_s);
       if (n == -1)
       {
           goto bad;
       }
   }
   if (chksum == 0)
   {
       /*
        *  If checksum is zero, by default libnet will compute a checksum
        *  for the user.  The programmer can override this by calling
        *  libnet_toggle_checksum(l, ptag, 1);
        */
       libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
   }


   return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_PIM_H));
bad:
   libnet_pblock_delete(l, p);
   return (-1);
}

/* EOF */