493 lines
19 KiB
C
493 lines
19 KiB
C
/****************************************************************************
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* net/devif/devif.h
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*
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* Copyright (C) 2007-2009, 2013-2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* This logic was leveraged from uIP which also has a BSD-style license:
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*
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* Author Adam Dunkels <adam@dunkels.com>
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* Copyright (c) 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef _NET_DEVIF_DEVIF_H
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#define _NET_DEVIF_DEVIF_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET
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#include <stdint.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <arch/irq.h>
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#include <nuttx/net/ip.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The following flags may be set in the set of flags by the lower, device-
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* interfacing layer before calling through the socket layer callback. The
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* TCP_ACKDATA, XYZ_NEWDATA, and TCP_CLOSE flags may be set at the same time,
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* whereas the others are mutually exclusive.
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*
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* Connection Specific Events: These are events that may be notified
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* through callback lists residing in TCP, UDP, or PKT port connection
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* structures:
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*
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* TCP_ACKDATA IN: Signifies that the outstanding data was ACKed and
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* the socket layer should send out new data instead
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* of retransmitting the last data (TCP only)
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* OUT: Input state must be preserved on output.
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*
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* TCP_NEWDATA IN: Set to indicate that the peer has sent us new data.
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* UDP_NEWDATA OUT: Cleared (only) by the socket layer logic to indicate
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* PKT_NEWDATA that the new data was consumed, suppressing further
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* attempts to process the new data.
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*
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* TCP_SNDACK IN: Not used; always zero
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* OUT: Set by the socket layer if the new data was consumed
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* and an ACK should be sent in the response. (TCP only)
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*
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* TCP_REXMIT IN: Tells the socket layer to retransmit the data that
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* was last sent. (TCP only)
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* OUT: Not used
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*
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* TCP_POLL IN: Used for polling the socket layer. This is provided
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* UDP_POLL periodically from the drivers to support (1) timed
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* PKT_POLL operations, and (2) to check if the socket layer has
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* data that it wants to send. These are socket oriented
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* callbacks where the context depends on the specific
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* set
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* OUT: Not used
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*
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* TCP_BACKLOG IN: There is a new connection in the backlog list set
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* up by the listen() command. (TCP only)
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* OUT: Not used
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*
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* TCP_CLOSE IN: The remote host has closed the connection, thus the
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* connection has gone away. (TCP only)
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* OUT: The socket layer signals that it wants to close the
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* connection. (TCP only)
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*
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* TCP_ABORT IN: The remote host has aborted the connection, thus the
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* connection has gone away. (TCP only)
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* OUT: The socket layer signals that it wants to abort the
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* connection. (TCP only)
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*
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* TCP_CONNECTED IN: We have got a connection from a remote host and have
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* set up a new connection for it, or an active connection
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* has been successfully established. (TCP only)
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* OUT: Not used
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*
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* TCP_TIMEDOUT IN: The connection has been aborted due to too many
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* retransmissions. (TCP only)
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* OUT: Not used
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*
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* Device Specific Events: These are events that may be notified through
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* callback lists residing in the network device structure.
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*
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* ICMP_NEWDATA IN: Set to indicate that the peer has sent us new data.
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* ICMPv6_NEWDATA OUT: Cleared (only) by the socket layer logic to indicate
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* that the new data was consumed, suppressing further
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* attempts to process the new data.
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*
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* ARP_POLL IN: Used for polling the socket layer. This is provided
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* periodically from the drivers to support (1) timed
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* operations, and (2) to check if the ARP layer needs
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* to send an ARP request. This is a device oriented
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* event, not associated with a socket.
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* OUT: Not used
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*
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* ICMP_POLL IN: Used for polling the socket layer. This is provided
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* periodically from the drivers to support (1) timed
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* operations, and (2) to check if the ICMP layer needs
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* to send an ARP request. This is a device oriented
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* event, not associated with a socket. This differs
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* from ICMPv6_POLL only in that the appdata pointer
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* is set differently
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* OUT: Not used
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*
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* ICMPv6_POLL IN: Used for polling the socket layer. This is provided
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* periodically from the drivers to support (1) timed
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* operations, and (2) to check if the ICMP layer needs
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* to send an ARP request. This is a device oriented
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* event, not associated with a socket. This differs
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* from ICMP_POLL only in that the appdata pointer
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* is set differently
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* OUT: Not used
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*
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* ICMP_ECHOREPLY IN: An ICMP Echo Reply has been received. Used to support
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* ICMP ping from the socket layer. (ICMPv4 only)
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* OUT: Cleared (only) by the socket layer logic to indicate
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* that the reply was processed, suppressing further
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* attempts to process the reply.
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*
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* ICMPv6_ECHOREPLY IN: An ICMP Echo Reply has been received. Used to support
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* ICMP ping from the socket layer. (ICMPv6 only)
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* OUT: Cleared (only) by the socket layer logic to indicate
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* that the reply was processed, suppressing further
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* attempts to process the reply.
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*
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* NETDEV_DOWN: IN: The network device has been taken down.
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* OUT: Not used
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*/
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/* Connection specific events */
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#define TCP_ACKDATA (1 << 0)
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#define TCP_NEWDATA (1 << 1)
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#define UDP_NEWDATA TCP_NEWDATA
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#define PKT_NEWDATA TCP_NEWDATA
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#define TCP_SNDACK (1 << 2)
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#define TCP_REXMIT (1 << 3)
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#define TCP_POLL (1 << 4)
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#define UDP_POLL TCP_POLL
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#define PKT_POLL TCP_POLL
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#define TCP_BACKLOG (1 << 5)
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#define TCP_CLOSE (1 << 6)
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#define TCP_ABORT (1 << 7)
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#define TCP_CONNECTED (1 << 8)
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#define TCP_TIMEDOUT (1 << 9)
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/* Device specific events */
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#define ICMP_NEWDATA TCP_NEWDATA
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#define ICMPv6_NEWDATA TCP_NEWDATA
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#define ARP_POLL (1 << 10)
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#define ICMP_POLL (1 << 11)
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#define ICMPv6_POLL (1 << 12)
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#define ICMP_ECHOREPLY (1 << 13)
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#define ICMPv6_ECHOREPLY (1 << 14)
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#define NETDEV_DOWN (1 << 15)
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/* The set of events that and implications to the TCP connection state */
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#define TCP_CONN_EVENTS \
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(TCP_CLOSE | TCP_ABORT | TCP_CONNECTED | TCP_TIMEDOUT | NETDEV_DOWN)
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#define TCP_DISCONN_EVENTS \
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(TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT | NETDEV_DOWN)
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/* IPv4/IPv6 Helpers */
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#ifdef CONFIG_NET_IPv4
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# define DEVIF_IS_IPv4(dev) IFF_IS_IPv4(dev->d_flags)
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#else
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# define DEVIF_IS_IPv4(dev) (0)
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#endif
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#ifdef CONFIG_NET_IPv6
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# define DEVIF_IS_IPv6(dev) IFF_IS_IPv6(dev->d_flags)
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#else
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# define DEVIF_IS_IPv6(dev) (0)
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#endif
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Describes a connection/device event callback interface
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*
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* nxtconn - Supports a singly linked list that supports connection
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* specific event handlers.
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* nxtdev - Supports a singly linked list that supports device specific
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* event handlers
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* event - Provides the address of the callback function entry point.
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* pvconn is a pointer to a connection-specific datat structure
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* such as struct tcp_conn_s or struct udp_conn_s.
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* priv - Holds a reference to socket layer specific data that will
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* provided
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* flags - Set by the socket layer to inform the lower layer which flags
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* are and are not handled by the callback.
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*/
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struct net_driver_s; /* Forward reference */
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struct devif_callback_s
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{
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FAR struct devif_callback_s *nxtconn;
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FAR struct devif_callback_s *nxtdev;
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uint16_t (*event)(FAR struct net_driver_s *dev, FAR void *pvconn,
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FAR void *pvpriv, uint16_t flags);
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FAR void *priv;
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uint16_t flags;
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* Increasing number used for the IP ID field. */
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extern uint16_t g_ipid;
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#if defined(CONFIG_NET_TCP_REASSEMBLY) && !defined(CONFIG_NET_IPv6)
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/* Reassembly timer (units: deci-seconds) */
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extern uint8_t g_reassembly_timer;
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: devif_initialize
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*
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* Description:
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* Perform initialization of the network device interface layer
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*
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* Parameters:
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* None
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*
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* Return:
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* None
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*
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****************************************************************************/
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void devif_initialize(void);
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/****************************************************************************
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* Function: devif_callback_init
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*
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* Description:
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* Configure the pre-allocated callback structures into a free list.
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*
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* Assumptions:
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* This function is called with interrupts disabled.
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*
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****************************************************************************/
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void devif_callback_init(void);
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/****************************************************************************
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* Function: devif_callback_alloc
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*
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* Description:
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* Allocate a callback container from the free list.
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*
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* If dev is non-NULL, then this function verifies that the device
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* reference is still valid and that the device is still UP status. If
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* those conditions are not true, this function will fail to allocate the
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* callback.
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*
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* Assumptions:
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* This function is called with the network locked.
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*
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****************************************************************************/
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FAR struct devif_callback_s *
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devif_callback_alloc(FAR struct net_driver_s *dev,
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FAR struct devif_callback_s **list);
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/****************************************************************************
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* Function: devif_conn_callback_free
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*
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* Description:
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* Return a connection/port callback container to the free list.
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*
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* This function is just a front-end for devif_callback_free(). If the
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* dev argument is non-NULL, it will verify that the device reference is
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* still valid before attempting to free the callback structure. A
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* non-NULL list pointer is assumed to be valid in any case.
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*
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* The callback structure will be freed in any event.
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*
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* Assumptions:
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* This function is called with the network locked.
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*
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****************************************************************************/
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void devif_conn_callback_free(FAR struct net_driver_s *dev,
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FAR struct devif_callback_s *cb,
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FAR struct devif_callback_s **list);
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/****************************************************************************
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* Function: devif_dev_callback_free
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*
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* Description:
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* Return a device callback container to the free list.
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*
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* This function is just a front-end for devif_callback_free(). If the
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* de argument is non-NULL, it will verify that the device reference is
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* still valid before attempting to free the callback structure. It
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* differs from devif_conn_callback_free in that connection/port-related
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* connections are also associated with the device and, hence, also will
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* not be valid if the device pointer is not valid.
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*
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* The callback structure will be freed in any event.
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*
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* Assumptions:
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* This function is called with the network locked.
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*
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****************************************************************************/
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void devif_dev_callback_free(FAR struct net_driver_s *dev,
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FAR struct devif_callback_s *cb);
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/****************************************************************************
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* Function: devif_conn_event
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*
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* Description:
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* Execute a list of callbacks.
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*
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* Input parameters:
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* dev - The network device state structure associated with the network
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* device that initiated the callback event.
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* pvconn - Holds a reference to the TCP connection structure or the UDP
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* port structure. May be NULL if the even is not related to a TCP
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* connection or UDP port.
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* flags - The bit set of events to be notified.
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* list - The list to traverse in performing the notifications
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*
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* Returned value:
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* The updated flags as modified by the callback functions.
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*
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* Assumptions:
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* This function is called with the network locked.
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*
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****************************************************************************/
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uint16_t devif_conn_event(FAR struct net_driver_s *dev, FAR void *pvconn,
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uint16_t flags, FAR struct devif_callback_s *list);
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/****************************************************************************
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* Function: devif_dev_event
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*
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* Description:
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* Execute a list of callbacks using the device event chain.
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*
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* Input parameters:
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* dev - The network device state structure associated with the network
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* device that initiated the callback event.
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* pvconn - Holds a reference to the TCP connection structure or the UDP
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* port structure. May be NULL if the even is not related to a TCP
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* connection or UDP port.
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* flags - The bit set of events to be notified.
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*
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* Returned value:
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* The updated flags as modified by the callback functions.
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*
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* Assumptions:
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* This function is called with the network locked.
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*
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****************************************************************************/
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uint16_t devif_dev_event(FAR struct net_driver_s *dev, void *pvconn,
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uint16_t flags);
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/****************************************************************************
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* Send data on the current connection.
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*
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* This function is used to send out a single segment of TCP data. Only
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* socket logic that have been invoked by the lower level for event
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* processing can send data.
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*
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* The amount of data that actually is sent out after a call to this
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* function is determined by the maximum amount of data TCP allows. uIP
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* will automatically crop the data so that only the appropriate
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* amount of data is sent. The function tcp_mss() can be used to query
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* uIP for the amount of data that actually will be sent.
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*
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* Note: This function does not guarantee that the sent data will
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* arrive at the destination. If the data is lost in the network, the
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* TCP socket layer will be invoked with the TCP_REXMIT flag set. The
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* socket layer will then have to resend the data using this function.
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*
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* data A pointer to the data which is to be sent.
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*
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* len The maximum amount of data bytes to be sent.
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*
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****************************************************************************/
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void devif_send(FAR struct net_driver_s *dev, FAR const void *buf, int len);
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/****************************************************************************
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* Name: devif_iob_send
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*
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* Description:
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* Called from socket logic in response to a xmit or poll request from the
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* the network interface driver.
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*
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* This is identical to calling devif_send() except that the data is
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* in an I/O buffer chain, rather than a flat buffer.
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*
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* Assumptions:
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* Called from the interrupt level or, at a minimum, with interrupts
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* disabled.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IOB
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struct iob_s;
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void devif_iob_send(FAR struct net_driver_s *dev, FAR struct iob_s *buf,
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unsigned int len, unsigned int offset);
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#endif
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/****************************************************************************
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* Name: devif_pkt_send
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*
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* Description:
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* Called from socket logic in order to send a raw packet in response to
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* an xmit or poll request from the the network interface driver.
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*
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* This is almost identical to calling devif_send() except that the data to
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* be sent is copied into dev->d_buf (vs. dev->d_appdata), since there is
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* no header on the data.
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*
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* Assumptions:
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* Called from the interrupt level or, at a minimum, with interrupts
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* disabled.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_PKT
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void devif_pkt_send(FAR struct net_driver_s *dev, FAR const void *buf,
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unsigned int len);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_NET */
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#endif /* _NET_DEVIF_DEVIF_H */
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