[lwip-users] udp changes in

[David Haas]

Hi Marc,

This was a question about your patch that I submitted. I looked at it and I 
admit I missed this
side effect.

What do you think?




Hello David, others,


could you pls. clarify this patch in udp.c?

Suppose I have two redundant network links to a remote server from my
lwIP device, using the raw API. I am setting up a udp pcb to talk with the
remote server. I bind it to any local interface address IP_ADDR_ANY.

udp_connect() would force the lwIP device to only listen on one of the
interfaces, as its local address is bound to a particular interface by your
patch.

Can your functionality be solved in the netconn() instead??

Leon.


 /* Nail down local IP for netconn_addr()/getsockname() */
 if(ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
   struct netif *netif;

   if((netif = ip_route(&(pcb->remote_ip))) == NULL) {
     DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n",
pcb->remote_ip.addr));
#ifdef UDP_STATS
     ++lwip_stats.udp.rterr;
#endif /* UDP_STATS */
     return ERR_RTE;
   }

   pcb->local_ip = netif->ip_addr;
 } else if(ip_addr_isany(&pcb->remote_ip)) {
   pcb->local_ip.addr = 0;
 }