uint16_t tcp_datahandler(FAR struct tcp_conn_s *conn, FAR uint8_t *buffer,
uint16_t buflen)
{
FAR struct iob_s *iob;
int ret;
/* Try to allocate on I/O buffer to start the chain without waiting (and
* throttling as necessary). If we would have to wait, then drop the
* packet.
*/
iob = iob_tryalloc(true);
if (iob == NULL)
{
nlldbg("ERROR: Failed to create new I/O buffer chain\n");
return 0;
}
/* Copy the new appdata into the I/O buffer chain (without waiting) */
ret = iob_trycopyin(iob, buffer, buflen, 0, true);
if (ret < 0)
{
/* On a failure, iob_copyin return a negated error value but does
* not free any I/O buffers.
*/
nlldbg("ERROR: Failed to add data to the I/O buffer chain: %d\n", ret);
(void)iob_free_chain(iob);
return 0;
}
/* Add the new I/O buffer chain to the tail of the read-ahead queue (again
* without waiting).
*/
ret = iob_tryadd_queue(iob, &conn->readahead);
if (ret < 0)
{
nlldbg("ERROR: Failed to queue the I/O buffer chain: %d\n", ret);
(void)iob_free_chain(iob);
return 0;
}
nllvdbg("Buffered %d bytes\n", buflen);
return buflen;
}
static uint16_t udp_datahandler(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn,
FAR uint8_t *buffer, uint16_t buflen)
{
FAR struct iob_s *iob;
int ret;
#ifdef CONFIG_NET_IPv6
FAR struct sockaddr_in6 src_addr6;
#endif
#ifdef CONFIG_NET_IPv4
FAR struct sockaddr_in src_addr4;
#endif
FAR void *src_addr;
uint8_t src_addr_size;
/* Allocate on I/O buffer to start the chain (throttling as necessary).
* We will not wait for an I/O buffer to become available in this context.
*/
iob = iob_tryalloc(true);
if (iob == NULL)
{
nerr("ERROR: Failed to create new I/O buffer chain\n");
return 0;
}
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
if (IFF_IS_IPv6(dev->d_flags))
#endif
{
FAR struct udp_hdr_s *udp = UDPIPv6BUF;
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
src_addr6.sin6_family = AF_INET6;
src_addr6.sin6_port = udp->srcport;
net_ipv6addr_copy(src_addr6.sin6_addr.s6_addr, ipv6->srcipaddr);
src_addr_size = sizeof(src_addr6);
src_addr = &src_addr6;
}
#endif /* CONFIG_NET_IPv6 */
#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
else
#endif
{
#ifdef CONFIG_NET_IPv6
/* Hybrid dual-stack IPv6/IPv4 implementations recognize a special
* class of addresses, the IPv4-mapped IPv6 addresses.
*/
if (conn->domain == PF_INET6)
{
FAR struct udp_hdr_s *udp = UDPIPv6BUF;
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
in_addr_t ipv4addr;
/* Encode the IPv4 address as an IPv-mapped IPv6 address */
src_addr6.sin6_family = AF_INET6;
src_addr6.sin6_port = udp->srcport;
ipv4addr = net_ip4addr_conv32(ipv6->srcipaddr);
ip6_map_ipv4addr(ipv4addr, src_addr6.sin6_addr.s6_addr16);
src_addr_size = sizeof(src_addr6);
src_addr = &src_addr6;
}
else
#endif
{
FAR struct udp_hdr_s *udp = UDPIPv4BUF;
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
src_addr4.sin_family = AF_INET;
src_addr4.sin_port = udp->srcport;
net_ipv4addr_copy(src_addr4.sin_addr.s_addr,
net_ip4addr_conv32(ipv4->srcipaddr));
src_addr_size = sizeof(src_addr4);
src_addr = &src_addr4;
}
}
#endif /* CONFIG_NET_IPv4 */
/* Copy the src address info into the I/O buffer chain. We will not wait
* for an I/O buffer to become available in this context. It there is
* any failure to allocated, the entire I/O buffer chain will be discarded.
*/
ret = iob_trycopyin(iob, (FAR const uint8_t *)&src_addr_size,
sizeof(uint8_t), 0, true);
if (ret < 0)
{
/* On a failure, iob_trycopyin return a negated error value but does
* not free any I/O buffers.
*/
nerr("ERROR: Failed to add data to the I/O buffer chain: %d\n", ret);
(void)iob_free_chain(iob);
return 0;
}
ret = iob_trycopyin(iob, (FAR const uint8_t *)src_addr, src_addr_size,
sizeof(uint8_t), true);
if (ret < 0)
{
/* On a failure, iob_trycopyin return a negated error value but does
* not free any I/O buffers.
*/
nerr("ERROR: Failed to add data to the I/O buffer chain: %d\n", ret);
(void)iob_free_chain(iob);
return 0;
}
if (buflen > 0)
{
/* Copy the new appdata into the I/O buffer chain */
ret = iob_trycopyin(iob, buffer, buflen,
src_addr_size + sizeof(uint8_t), true);
if (ret < 0)
{
/* On a failure, iob_trycopyin return a negated error value but
* does not free any I/O buffers.
*/
nerr("ERROR: Failed to add data to the I/O buffer chain: %d\n",
ret);
(void)iob_free_chain(iob);
return 0;
}
}
/* Add the new I/O buffer chain to the tail of the read-ahead queue */
ret = iob_tryadd_queue(iob, &conn->readahead);
if (ret < 0)
{
nerr("ERROR: Failed to queue the I/O buffer chain: %d\n", ret);
(void)iob_free_chain(iob);
return 0;
}
#ifdef CONFIG_UDP_READAHEAD_NOTIFIER
/* Provided notification(s) that additional UDP read-ahead data is
* available.
*/
udp_notifier_signal(conn);
#endif
ninfo("Buffered %d bytes\n", buflen);
return buflen;
}
