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fixed bug #34681 Limit ARP queue length by ARP_QUEUE_LEN (=3)

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This commit is contained in:
Simon Goldschmidt
2014-02-22 21:38:56 +01:00
parent 05a967564a
commit 07fbe82305
3 changed files with 23 additions and 0 deletions
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12
src/netif/etharp.c
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@@ -1140,20 +1140,32 @@ etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
/* allocate a new arp queue entry */
new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
if (new_entry != NULL) {
unsigned int qlen = 0;
new_entry->next = 0;
new_entry->p = p;
if(arp_table[i].q != NULL) {
/* queue was already existent, append the new entry to the end */
struct etharp_q_entry *r;
r = arp_table[i].q;
qlen++;
while (r->next != NULL) {
r = r->next;
qlen++;
}
r->next = new_entry;
} else {
/* queue did not exist, first item in queue */
arp_table[i].q = new_entry;
}
#if ARP_QUEUE_LEN
if (qlen >= ARP_QUEUE_LEN) {
struct etharp_q_entry *old;
old = arp_table[i].q;
arp_table[i].q = arp_table[i].q->next;
pbuf_free(old->p);
memp_free(MEMP_ARP_QUEUE, old);
}
#endif
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
result = ERR_OK;
} else {