[lwip-devel] [patch #5824] gratuitous ARP

[Frédéric Bernon]

URL:
  <http://savannah.nongnu.org/patch/?5824>

                 Summary: gratuitous ARP
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: fbernon
            Submitted on: lundi 26.03.2007 à 22:35
                Category: None
                Priority: 3 - Low
                  Status: None
                 Privacy: Public
             Assigned to: fbernon
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I would like to reactivate the "gratuitous ARP". In netif.c, in
netif_set_ipaddr(), we can see :

#if 0 /* only allowed for Ethernet interfaces TODO: how can we check? */
  /** For Ethernet network interfaces, we would like to send a
   *  "gratuitous ARP"; this is an ARP packet sent by a node in order
   *  to spontaneously cause other nodes to update an entry in their
   *  ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6.
   */ 
  etharp_query(netif, ipaddr, NULL);
#endif

So, my idea will be to add in netif.h a new flag like this :

/** if set, the netif is an device using ARP */
#define NETIF_FLAG_ETHARP 0x20U

Each driver would have to declare if it can do "gratuitous ARP" when prepare
the netif (like for the NETIF_FLAG_BROADCAST flag).

So, we could check if we have to send a "gratuitous ARP" like that :

if ((netif->flags & NETIF_FLAG_ETHARP) == 0)

Note that, of course, etharp_init have to be called before...






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