void uip_udppoll(struct uip_driver_s *dev, struct uip_udp_conn *conn)
{
/* Verify that the UDP connection is valid */
if (conn->lport != 0)
{
/* Setup for the application callback */
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
dev->d_len = 0;
dev->d_sndlen = 0;
/* Perform the application callback */
uip_udpcallback(dev, conn, UIP_POLL);
/* If the application has data to send, setup the UDP/IP header */
if (dev->d_sndlen > 0)
{
uip_udpsend(dev, conn);
return;
}
}
/* Make sure that d_len is zero meaning that there is nothing to be sent */
dev->d_len = 0;
}
int uip_udpinput(FAR struct uip_driver_s *dev)
{
struct uip_udp_conn *conn;
struct uip_udpip_hdr *pbuf = UDPBUF;
int ret = OK;
#ifdef CONFIG_NET_STATISTICS
uip_stat.udp.recv++;
#endif
/* UDP processing is really just a hack. We don't do anything to the UDP/IP
* headers, but let the UDP application do all the hard work. If the
* application sets d_sndlen, it has a packet to send.
*/
dev->d_len -= UIP_IPUDPH_LEN;
#ifdef CONFIG_NET_UDP_CHECKSUMS
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
if (pbuf->udpchksum != 0 && uip_udpchksum(dev) != 0xffff)
{
#ifdef CONFIG_NET_STATISTICS
uip_stat.udp.drop++;
uip_stat.udp.chkerr++;
#endif
nlldbg("Bad UDP checksum\n");
dev->d_len = 0;
}
else
#endif
{
/* Demultiplex this UDP packet between the UDP "connections". */
conn = uip_udpactive(pbuf);
if (conn)
{
uint16_t flags;
/* Set-up for the application callback */
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
dev->d_sndlen = 0;
/* Perform the application callback */
flags = uip_udpcallback(dev, conn, UIP_NEWDATA);
/* If the operation was successful, the UIP_NEWDATA flag is removed
* and thus the packet can be deleted (OK will be returned).
*/
if ((flags & UIP_NEWDATA) != 0)
{
/* No.. the packet was not processed now. Return ERROR so
* that the driver may retry again later.
*/
ret = ERROR;
}
/* If the application has data to send, setup the UDP/IP header */
if (dev->d_sndlen > 0)
{
uip_udpsend(dev, conn);
}
}
else
{
nlldbg("No listener on UDP port\n");
dev->d_len = 0;
}
}
return ret;
}
