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update_arp_entry() now accepts multiple packets on the queue to be sent out.

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However, code to actually put multiple packets on the queue is a next step.
This commit is contained in:
likewise 2003-11-18 01:34:23 +00:00
parent 2c1cf05524
commit 9a2732e9eb
1 changed files with 33 additions and 6 deletions
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39
src/netif/etharp.c
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@ -42,6 +42,13 @@
*
*/
/**
* TODO:
* - pbufs should be sent from the queue once an ARP entry state
* goes from PENDING to STABLE.
* - Non-PENDING entries MUST NOT have queued packets.
*/
/*
* TODO:
*
@ -307,6 +314,9 @@ etharp_dequeue(s8_t i)
/**
* Update (or insert) a IP/MAC address pair in the ARP cache.
*
* If a pending entry is resolved, any queued packets will be sent
* at this point.
*
* @param ipaddr IP address of the inserted ARP entry.
* @param ethaddr Ethernet address of the inserted ARP entry.
* @param flags Defines behaviour:
@ -345,7 +355,7 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
arp_table[i].state = ETHARP_STATE_STABLE;
/* fall-through to next if */
}
/* stable entry? (possible just marked to become stable) */
/* stable entry? (possibly just marked to become stable) */
if (arp_table[i].state == ETHARP_STATE_STABLE) {
#if ARP_QUEUEING
struct pbuf *p;
@ -358,12 +368,25 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
}
/* reset time stamp */
arp_table[i].ctime = 0;
/* this is where we will send out queued packets! */
#if ARP_QUEUEING
/* get the first packet on the queue (if any) */
p = arp_table[i].p;
/* queued packet present? */
if (p != NULL) {
/* NULL attached buffer immediately */
arp_table[i].p = NULL;
while (p != NULL) {
struct pbuf *q, *n;
/* search for second packet on queue (n) */
q = p;
while (q->tot_len > q->len) {
/* proceed to next pbuf of this packet */
LWIP_ASSERT("q->next ! NULL", q->next != NULL);
q = q->next;
}
/* { q = last pbuf of first packet, q->tot_len = q->len } */
n = q->next;
/* { n = first pbuf of 2nd packet, or NULL if no 2nd packet } */
/* terminate the first packet pbuf chain */
q->next = NULL;
/* fill-in Ethernet header */
ethhdr = p->payload;
for (k = 0; k < netif->hwaddr_len; ++k) {
@ -371,12 +394,16 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
ethhdr->src.addr[k] = netif->hwaddr[k];
}
ethhdr->type = htons(ETHTYPE_IP);
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: sending queued IP packet.\n"));
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: sending queued IP packet %p.\n",(void *)p));
/* send the queued IP packet */
netif->linkoutput(netif, p);
/* free the queued IP packet */
pbuf_free(p);
/* proceed to next packet on queue */
p = n;
}
/* NULL attached buffer*/
arp_table[i].p = NULL;
#endif
return NULL;
}
@ -420,7 +447,7 @@ update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *e
}
/**
* Updates the ARP table using the given packet.
* Updates the ARP table using the given IP packet.
*
* Uses the incoming IP packet's source address to update the
* ARP cache for the local network. The function does not alter