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More robust DHCP ARP reply checking.

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likewise 2005-01-24 23:02:29 +00:00
parent 6880fa62f8
commit 8579e4144f
2 changed files with 11 additions and 5 deletions
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3
src/core/dhcp.c
View File

@ -633,8 +633,9 @@ void dhcp_inform(struct netif *netif)
*/
void dhcp_arp_reply(struct netif *netif, struct ip_addr *addr)
{
LWIP_ASSERT("netif != NULL", netif != NULL);
LWIP_DEBUGF(DHCP_DEBUG | DBG_TRACE | 3, ("dhcp_arp_reply()\n"));
/* is this DHCP client doing an ARP check? */
/* is a DHCP client doing an ARP check? */
if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
LWIP_DEBUGF(DHCP_DEBUG | DBG_TRACE | DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08lx\n", addr->addr));
/* did a host respond with the address we

13
src/netif/etharp.c
View File

@ -431,7 +431,7 @@ void
etharp_ip_input(struct netif *netif, struct pbuf *p)
{
struct ethip_hdr *hdr;
LWIP_ASSERT("netif != NULL", netif != NULL);
/* Only insert an entry if the source IP address of the
incoming IP packet comes from a host on the local network. */
hdr = p->payload;
@ -473,6 +473,8 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
u8_t i;
u8_t for_us;
LWIP_ASSERT("netif != NULL", netif != NULL);
/* drop short ARP packets */
if (p->tot_len < sizeof(struct etharp_hdr)) {
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%d/%d)\n", p->tot_len, sizeof(struct etharp_hdr)));
@ -554,9 +556,12 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
/* ARP reply. We already updated the ARP cache earlier. */
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
/* When unconfigured, DHCP wants to know about ARP replies from the
* address offered to us, as that means someone else uses it already! */
if (netif->ip_addr.addr == 0) dhcp_arp_reply(netif, &sipaddr);
/* DHCP wants to know about ARP replies from any host with an
* IP address also offered to us by the DHCP server. We do not
* want to take a duplicate IP address on a single network.
* @todo How should we handle redundant (fail-over) interfaces?
* */
dhcp_arp_reply(netif, &sipaddr);
#endif
break;
default: