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incubator-nuttx/net/udp/udp_callback.c

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/****************************************************************************
* net/udp/udp_callback.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
#include <stdint.h>
#include <string.h>
#include <debug.h>
#include <sys/time.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/netstats.h>
#include <nuttx/net/udp.h>
#include "devif/devif.h"
#include "udp/udp.h"
#include "utils/utils.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: udp_datahandler
*
* Description:
* Handle the receipt of UDP data by adding the newly received packet to
* the UDP read-ahead buffer.
*
****************************************************************************/
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
struct sockaddr_in6 src_addr6 =
{
0
};
#endif
#ifdef CONFIG_NET_IPv4
struct sockaddr_in src_addr4 =
{
0
};
#endif
uint8_t src_addr_size;
FAR void *src_addr;
int offset;
#if CONFIG_NET_RECV_BUFSIZE > 0
if (conn->readahead && conn->readahead->io_pktlen > conn->rcvbufs)
{
netdev_iob_release(dev);
#ifdef CONFIG_NET_STATISTICS
g_netstats.udp.drop++;
#endif
return 0;
}
#endif
iob = dev->d_iob;
#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 = UDPIPv4BUF;
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
in_addr_t ipv4addr;
/* Encode the IPv4 address as an IPv4-mapped IPv6 address */
src_addr6.sin6_family = AF_INET6;
src_addr6.sin6_port = udp->srcport;
ipv4addr = net_ip4addr_conv32(ipv4->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));
memset(src_addr4.sin_zero, 0, sizeof(src_addr4.sin_zero));
src_addr_size = sizeof(src_addr4);
src_addr = &src_addr4;
}
}
#endif /* CONFIG_NET_IPv4 */
/* Copy the meta info into the I/O buffer chain, just before data.
* Layout: |datalen|ifindex|src_addr_size|src_addr|[timestamp]|data|
*/
offset = (dev->d_appdata - iob->io_data) - iob->io_offset;
#ifdef CONFIG_NET_TIMESTAMP
/* Store timestamp while packet is being queued.
* This is done unconditionally to avoid race condition when SO_TIMESTAMP
* gets enabled after packet is received but before it is read.
*/
offset -= sizeof(struct timespec);
ret = iob_trycopyin(iob, (FAR const uint8_t *)&dev->d_rxtime,
sizeof(struct timespec), offset, true);
if (ret < 0)
{
goto errout;
}
#endif
offset -= src_addr_size;
ret = iob_trycopyin(iob, src_addr, src_addr_size, offset, true);
if (ret < 0)
{
goto errout;
}
offset -= sizeof(src_addr_size);
ret = iob_trycopyin(iob, &src_addr_size, sizeof(src_addr_size),
offset, true);
if (ret < 0)
{
goto errout;
}
#ifdef CONFIG_NETDEV_IFINDEX
offset -= sizeof(dev->d_ifindex);
ret = iob_trycopyin(iob, &dev->d_ifindex, sizeof(dev->d_ifindex),
offset, true);
if (ret < 0)
{
goto errout;
}
#endif
offset -= sizeof(buflen);
ret = iob_trycopyin(iob, (FAR const uint8_t *)&buflen, sizeof(buflen),
offset, true);
if (ret < 0)
{
goto errout;
}
/* Reset new offset to point at start point. */
DEBUGASSERT(iob->io_offset + offset >= 0);
iob_reserve(iob, iob->io_offset + offset);
/* Concat the iob to readahead */
net_iob_concat(&conn->readahead, &iob);
#ifdef CONFIG_NET_UDP_NOTIFIER
ninfo("Buffered %d bytes\n", buflen);
/* Provided notification(s) that additional UDP read-ahead data is
* available.
*/
udp_readahead_signal(conn);
#endif
netdev_iob_clear(dev);
return buflen;
errout:
nerr("ERROR: Failed to queue the I/O buffer chain: %d\n", ret);
netdev_iob_release(dev);
return 0;
}
/****************************************************************************
* Name: net_dataevent
*
* Description:
* Handling the network UDP_NEWDATA event.
*
****************************************************************************/
static inline uint16_t
net_dataevent(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn,
uint16_t flags)
{
uint16_t ret;
uint8_t *buffer = dev->d_appdata;
int buflen = dev->d_len;
uint16_t recvlen;
ret = (flags & ~UDP_NEWDATA);
/* Is there new data? With non-zero length? (Certain connection events
* can have zero-length with UDP_NEWDATA set just to cause an ACK).
*/
ninfo("No receive on connection\n");
/* Save as the packet data as in the read-ahead buffer. NOTE that
* partial packets will not be buffered.
*/
recvlen = udp_datahandler(dev, conn, buffer, buflen);
if (recvlen < buflen)
{
/* There is no handler to receive new data and there are no free
* read-ahead buffers to retain the data -- drop the packet.
*/
ninfo("Dropped %d bytes\n", dev->d_len);
#ifdef CONFIG_NET_STATISTICS
g_netstats.udp.drop++;
#endif
}
/* In any event, the new data has now been handled */
dev->d_len = 0;
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: udp_callback
*
* Description:
* Inform the application holding the UDP socket of a change in state.
*
* Returned Value:
* OK if packet has been processed, otherwise ERROR.
*
* Assumptions:
* This function must be called with the network locked.
*
****************************************************************************/
uint16_t udp_callback(FAR struct net_driver_s *dev,
FAR struct udp_conn_s *conn, uint16_t flags)
{
ninfo("flags: %04x\n", flags);
/* Some sanity checking */
if (conn)
{
/* Perform the callback */
flags = devif_conn_event(dev, flags, conn->sconn.list);
if ((flags & UDP_NEWDATA) != 0)
{
/* Data was not handled.. dispose of it appropriately */
flags = net_dataevent(dev, conn, flags);
}
}
return flags;
}
#endif /* CONFIG_NET && CONFIG_NET_UDP */
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