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ip_input: better check for old link-local-address (explicitly check for autoip->llipaddr instead of letting all link-local-addresses through)

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goldsimon 2010-03-08 18:24:23 +00:00
parent 2a2be49d2c
commit d91caf1cd3
1 changed files with 13 additions and 7 deletions
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20
src/core/ipv4/ip.c
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@ -52,6 +52,7 @@
#include "lwip/tcp_impl.h"
#include "lwip/snmp.h"
#include "lwip/dhcp.h"
#include "lwip/autoip.h"
#include "lwip/stats.h"
#include "arch/perf.h"
@ -296,18 +297,23 @@ ip_input(struct pbuf *p, struct netif *inp)
/* unicast to this interface address? */
if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
/* or broadcast on this interface network address? */
ip_addr_isbroadcast(&(iphdr->dest), netif)
#if LWIP_AUTOIP
/* connections to link-local addresses must persist after changing
the netif's address (RFC3927 ch. 1.9) */
|| ip_addr_islinklocal(&(iphdr->dest))
#endif /* LWIP_AUTOIP */
) {
ip_addr_isbroadcast(&(iphdr->dest), netif)) {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* break out of for loop */
break;
}
#if LWIP_AUTOIP
/* connections to link-local addresses must persist after changing
the netif's address (RFC3927 ch. 1.9) */
if ((netif->autoip != NULL) &&
ip_addr_cmp(&(iphdr->dest), &(netif->autoip->llipaddr))) {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* break out of for loop */
break;
}
#endif /* LWIP_AUTOIP */
}
if (first) {
first = 0;