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nd6: Return ERR_MEM if ND6 queue is full

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2.1.3-esp: a46014d2 nd6: Queue IPv6 packets while ND6 inprogress
This commit is contained in:
ChenJianxing
2020-07-20 21:03:09 +08:00
committed by David Cermak
parent 37b10cbdec
commit 73a598fcd8
2 changed files with 27 additions and 0 deletions
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src/core/ipv6/nd6.c
+19
View File
@@ -2105,6 +2105,12 @@ nd6_queue_packet(s8_t neighbor_index, struct pbuf *q)
if (copy_needed) {
/* copy the whole packet into new pbufs */
p = pbuf_clone(PBUF_LINK, PBUF_RAM, q);
#if ESP_ND6_QUEUEING
if(p == NULL) {
pbuf_free(q);
return ERR_MEM;
}
#else
while ((p == NULL) && (neighbor_cache[neighbor_index].q != NULL)) {
/* Free oldest packet (as per RFC recommendation) */
#if LWIP_ND6_QUEUEING
@@ -2118,6 +2124,7 @@ nd6_queue_packet(s8_t neighbor_index, struct pbuf *q)
#endif /* LWIP_ND6_QUEUEING */
p = pbuf_clone(PBUF_LINK, PBUF_RAM, q);
}
#endif
} else {
/* referencing the old pbuf is enough */
p = q;
@@ -2143,19 +2150,31 @@ nd6_queue_packet(s8_t neighbor_index, struct pbuf *q)
nd6_queue_size++;
}
if (new_entry != NULL) {
unsigned int qlen = 0;
new_entry->next = NULL;
new_entry->p = p;
if (neighbor_cache[neighbor_index].q != NULL) {
/* queue was already existent, append the new entry to the end */
r = neighbor_cache[neighbor_index].q;
qlen++;
while (r->next != NULL) {
r = r->next;
qlen++;
}
r->next = new_entry;
} else {
/* queue did not exist, first item in queue */
neighbor_cache[neighbor_index].q = new_entry;
}
#if ESP_ND6_QUEUEING
if (qlen >= MEMP_NUM_ND6_QUEUE) {
r->next = NULL;
pbuf_free(new_entry->p);
memp_free(MEMP_ND6_QUEUE, new_entry);
LWIP_DEBUGF(LWIP_DBG_TRACE, ("ipv6: could not queue the packet %p (queue is full)\n", (void *)q));
return ERR_MEM;
}
#endif
LWIP_DEBUGF(LWIP_DBG_TRACE, ("ipv6: queued packet %p on neighbor entry %"S16_F"\n", (void *)p, (s16_t)neighbor_index));
result = ERR_OK;
} else {
src/include/lwip/opt.h
+8
View File
@@ -2624,6 +2624,14 @@
#define LWIP_ND6_QUEUEING LWIP_IPV6
#endif
/**
* ESP_ND6_QUEUEING==1: queue outgoing IPv6 packets while MAC address
* is being resolved.
*/
#if !defined ESP_ND6_QUEUEING || defined __DOXYGEN__
#define ESP_ND6_QUEUEING LWIP_IPV6
#endif
/**
* MEMP_NUM_ND6_QUEUE: Max number of IPv6 packets to queue during MAC resolution.
*/