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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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3
CHANGELOG
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@ -96,6 +96,9 @@ HISTORY
++ Bugfixes:
2014-02-22: Simon Goldschmidt (patch by Amir Shalem)
* etharp.c, opt.h: fixed bug #34681 Limit ARP queue length by ARP_QUEUE_LEN (=3)
2014-02-22: Simon Goldschmidt (patch by Amir Shalem)
* etharp.h/.c: fixed bug #34682 Limit ARP request flood for unresolved entry

8
src/include/lwip/opt.h
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@ -481,6 +481,14 @@
#define ARP_QUEUEING 0
#endif
/** The maximum number of packets which may be queued for each
* unresolved address by other network layers. Defaults to 3, 0 means disabled.
* Old packets are dropped, new packets are queued.
*/
#ifndef ARP_QUEUE_LEN
#define ARP_QUEUE_LEN 3
#endif
/**
* ETHARP_TRUST_IP_MAC==1: Incoming IP packets cause the ARP table to be
* updated with the source MAC and IP addresses supplied in the packet.

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 {