[lwip-users] Multicast packet will drop in ip.c

[Bandu]

Hi,

 

I would like to check lwip 1.3.2 implementation about multicast/broadcast implementation.

even though, IP_SOF_BROADCAST_RECV & IP_SOF_BROADCAST defined, ip layer will drop all multicast and broadcast packet except DHCP protocol. Is this a bug or intended implementation?

// In ip.c

  if (check_ip_src)
  {  if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
         (ip_addr_ismulticast(&(iphdr->src)))) {
      /* packet source is not valid */
      LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet source is not valid.\n"));
      /* free (drop) packet pbufs */
      pbuf_free(p);
      IP_STATS_INC(ip.drop);
      snmp_inc_ipinaddrerrors();
      snmp_inc_ipindiscards();
      return ERR_OK;
    }
  }

Regards,

--
Bandu
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