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bug #54700: Unexpected expiry of pending ARP table entry

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New etharp queries should restart the 5 second timeout on the ARP
table entry if it is still pending.

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
(cherry picked from commit ffbe075d56)
This commit is contained in:
Florent Matignon 2018-09-20 16:40:34 +02:00 committed by Simon Goldschmidt
parent 4022a19cbc
commit 214e2d90f3
1 changed files with 8 additions and 0 deletions
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8
src/core/ipv4/etharp.c
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@ -983,6 +983,14 @@ etharp_query(struct netif *netif, const ip4_addr_t *ipaddr, struct pbuf *q)
/* We don't re-send arp request in etharp_tmr, but we still queue packets,
since this failure could be temporary, and the next packet calling
etharp_query again could lead to sending the queued packets. */
} else {
/* ARP request successfully sent */
if ((arp_table[i].state == ETHARP_STATE_PENDING) && !is_new_entry) {
/* A new ARP request has been sent for a pending entry. Reset the ctime to
not let it expire too fast. */
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: reset ctime for entry %"S16_F"\n", (s16_t)i));
arp_table[i].ctime = 0;
}
}
if (q == NULL) {
return result;