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ARP entries can now be updated (but not added) on any ARP traffic. Set #define ETHARP_SNOOP_UPDATES 1 to enable.

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likewise 2002-11-13 09:10:19 +00:00
parent f9129c4dcd
commit d31ef42acf
1 changed files with 27 additions and 30 deletions
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57
src/netif/etharp.c
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@ -3,26 +3,11 @@
* Address Resolution Protocol module for IP over Ethernet
*
* $Log: etharp.c,v $
* Revision 1.8 2002/11/13 09:10:19 likewise
* ARP entries can now be updated (but not added) on any ARP traffic. Set #define ETHARP_SNOOP_UPDATES 1 to enable.
*
* Revision 1.7 2002/11/13 08:56:11 likewise
* Implemented conditional insertion of ARP entries to update_arp_entry using ARP_INSERT_FLAG.
*
* Revision 1.6 2002/11/11 14:34:29 likewise
* Changed static etharp_query() to support queueing packets. This fix missed in last commit.
*
* Revision 1.5 2002/11/08 22:14:24 likewise
* Fixed numerous bugs. Re-used etharp_query() in etharp_output(). Added comments and JavaDoc documentation.
*
* Revision 1.4 2002/11/08 12:54:43 proff_fs
* Added includeds for bpstruct and epstruct.
* Ports should update from using PACK_STRUCT_BEGIN and PACK_STRUCT_END to use these includes.
* Maybe there should be an PACK_STRUCT_USE_INCLUDES ifdef around these, for ports for which PACK_STRUCT_BEGIN and PACK_STRUCT_END works nicely.
*
* Revision 1.3 2002/11/06 11:43:21 likewise
* find_arp_entry() returned 0 instead of ARP_TABLE_SIZE if full pending cache (bug #1625).
*
* Revision 1.2 2002/11/04 14:56:40 likewise
* Fixed NULL pointer bug (#1493). Fix for memory leak bug (#1601), etharp_output_sent(). Added etharp_query for DHCP.
*
*/
/*
@ -107,6 +92,9 @@ RFC 3220 4.6 IP Mobility Support for IPv4 January 2002
/** the time an ARP entry stays pending after first request, (2 * 10) seconds = 20 seconds. */
#define ARP_MAXPENDING 2
/** dis/enable existing ARP entries updates on any ARP traffic */
#define ETHARP_SNOOP_UPDATES 0
#define HWTYPE_ETHERNET 1
/** ARP message types */
@ -413,6 +401,7 @@ struct pbuf *
etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
{
struct etharp_hdr *hdr;
struct pbuf *q;
u8_t i;
/* drop short ARP packets */
@ -457,10 +446,15 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
/* return ARP reply */
return p;
}
#if 0
/* ARP request, NOT for our address */
else
{
#if ETHARP_SNOOP_UPDATES
/* request, NOT for our address */
else {
/* update_arp_entry() can return a pbuf that has previously been
queued waiting for this IP address to become ARP stable. */
q = update_arp_entry(&(hdr->sipaddr), &(hdr->shwaddr), 0);
pbuf_free(p);
p = NULL;
return q;
}
#endif
break;
@ -468,12 +462,11 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
/* ARP reply. We insert or update the ARP table. */
DEBUGF(ETHARP_DEBUG, ("etharp_arp_input: ARP reply\n"));
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
/* DHCP needs to know about ARP replies */
dhcp_arp_reply(&hdr->sipaddr);
/* DHCP needs to know about ARP replies */
dhcp_arp_reply(&hdr->sipaddr);
#endif
/* for our address? */
if(ip_addr_cmp(&(hdr->dipaddr), &(netif->ip_addr))) {
struct pbuf *q;
DEBUGF(ETHARP_DEBUG, ("etharp_arp_input: ARP reply for us\n"));
/* update_arp_entry() can return a pbuf that has previously been
queued waiting for this IP address to become ARP stable. */
@ -483,10 +476,15 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
p = NULL;
return q;
}
#if 0
/* ARP reply, NOT for our address */
else
{
#if ETHARP_SNOOP_UPDATES
/* ARP reply, NOT for our address */
else {
/* update_arp_entry() can return a pbuf that has previously been
queued waiting for this IP address to become ARP stable. */
q = update_arp_entry(&(hdr->sipaddr), &(hdr->shwaddr), 0);
pbuf_free(p);
p = NULL;
return q;
}
#endif
break;
@ -494,7 +492,6 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
DEBUGF(ETHARP_DEBUG, ("etharp_arp_input: unknown type %d\n", htons(hdr->opcode)));
break;
}
pbuf_free(p);
return NULL;
}