anchao commented on code in PR #7616:
URL: https://github.com/apache/nuttx/pull/7616#discussion_r1037779107
##########
net/icmpv6/icmpv6_reply.c:
##########
@@ -108,6 +108,64 @@ void icmpv6_reply(FAR struct net_driver_s *dev, int type,
int code, int data)
if (datalen > ICMPv6_MINMTULEN - ipicmplen)
{
datalen = ICMPv6_MINMTULEN - ipicmplen;
+ iob_trimtail(dev->d_iob, dev->d_iob->io_pktlen - datalen);
+ }
+
+ /* Save the original datagram */
+
+ if (CONFIG_IOB_BUFSIZE >= datalen + ipicmplen +
+ CONFIG_NET_LL_GUARDSIZE)
+ {
+ /* Reuse current iob */
+
+ memmove((FAR char *)ipv6 + ipicmplen, ipv6, datalen);
+
+ /* Skip icmp header from iob */
+
+ iob_update_pktlen(dev->d_iob, datalen + ipicmplen);
+ }
+ else
+ {
+ FAR struct iob_s *iob;
+
+ /* Save the original datagram to iob chain */
+
+ iob = dev->d_iob;
+ dev->d_iob = NULL;
+
+ /* Re-prepare device buffer */
+
+ if (netdev_iob_prepare(dev, false, 0) != OK)
+ {
+ dev->d_len = 0;
+ dev->d_iob = iob;
+ netdev_iob_release(dev);
+ return;
+ }
+
+ /* Copy ipv4 header to device buffer */
+
+ if (iob_trycopyin(dev->d_iob, (FAR void *)ipv6,
Review Comment:
parameter prototype conflict, cast is needed
```
int iob_trycopyin(FAR struct iob_s *iob, FAR const uint8_t *src,
unsigned int len, unsigned int offset, bool throttled)
```
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