606 lines
22 KiB
C
606 lines
22 KiB
C
/****************************************************************************
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* net/devif/devif.h
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*
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* Copyright (C) 2007-2009, 2013-2017 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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#include <nuttx/net/netdev.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
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* ICMP_NEWDATA indicate that the new data was consumed,
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* ICMPv6_NEWDATA suppressing further attempts to process the new
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* PKT_NEWDATA data.
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* BLUETOOTH_NEWDATA
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* IEEE802154_NEWDATA
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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
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* consumed and an ACK should be sent in the response.
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* (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
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* UDP_POLL provided periodically from the drivers to support
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* PKT_POLL (1) timed operations, and (2) to check if the
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* BLUETOOTH_POLL socket layer has data that it wants to send.
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* IEEE802154_POLL These are socket oriented callbacks where the
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* context depends on the specific 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
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* the 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
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* have set up a new connection for it, or an active
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* connection has been successfully established.
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* (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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* ARP_POLL IN: Used for polling the socket layer. This is
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* provided periodically from the drivers to support
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* (1) timed operations, and (2) to check if the ARP
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* layer needs to send an ARP request. This is a
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* device oriented event, not associated with a
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* 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
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* provided periodically from the drivers to support
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* (1) timed operations, and (2) to check if the ICMP
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* layer needs to send an ARP request. This is a
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* device oriented event, not associated with a
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* socket. This differs from ICMPv6_POLL only in that
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* the appdata pointer 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
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* provided periodically from the drivers to support
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* (1) timed operations, and (2) to check if the ICMP
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* layer needs to send an ARP request. This is a
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* device oriented event, not associated with a
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* socket. This differs from ICMP_POLL only in that
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* the appdata pointer is set differently.
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* OUT: Not used
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*
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* IPFWD_POLL IN: Used for polling for forwarded packets layer. This
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* is provided periodically from the drivers to
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* support to check if there is a packet waiting to be
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* forward on the device. This is a device oriented
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* event, not associated with a socket. The appdata
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* pointer is not used in this case.
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* OUT: Not used
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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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/* Bits 0-9: Connection specific event bits */
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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 ICMP_NEWDATA TCP_NEWDATA
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#define ICMPv6_NEWDATA TCP_NEWDATA
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#define BLUETOOTH_NEWDATA TCP_NEWDATA
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#define IEEE802154_NEWDATA TCP_NEWDATA
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#define PKT_NEWDATA TCP_NEWDATA
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#define CAN_NEWDATA TCP_NEWDATA
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#define WPAN_NEWDATA TCP_NEWDATA
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#define IPFWD_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 CAN_POLL TCP_POLL
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#define BLUETOOTH_POLL TCP_POLL
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#define IEEE802154_POLL TCP_POLL
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#define WPAN_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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#define TCP_WAITALL (1 << 10)
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/* Bits 10-11: Unused, available */
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/* Bit 12: Device specific event bits */
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#define NETDEV_DOWN (1 << 12)
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/* Bits 13-15: Encoded device specific poll events. Unlike connection
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* oriented poll events, device related poll events must distinguish
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* between what is being polled for since the callbacks all reside in
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* the same list in the network device structure.
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*/
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#define DEVPOLL_SHIFT (13)
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#define DEVPOLL_MASK (7 << DEVPOLL_SHIFT)
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# define DEVPOLL_NONE (0 << DEVPOLL_SHIFT)
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# define ARP_POLL (1 << DEVPOLL_SHIFT)
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# define ICMP_POLL (2 << DEVPOLL_SHIFT)
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# define ICMPv6_POLL (3 << DEVPOLL_SHIFT)
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# define IPFWD_POLL (4 << DEVPOLL_SHIFT)
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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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/* There are some helper pointers for accessing the contents of the Ethernet
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* headers
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*/
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#define ETHBUF ((FAR struct eth_hdr_s *)NETLLBUF)
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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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typedef CODE uint16_t (*devif_callback_event_t)(FAR struct net_driver_s *dev,
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FAR void *pvpriv,
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uint16_t flags);
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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 *prevconn;
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FAR struct devif_callback_s *nxtdev;
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FAR devif_callback_event_t event;
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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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#undef EXTERN
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#if defined(__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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* Public Function Prototypes
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****************************************************************************/
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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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* Input Parameters:
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* None
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*
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* Returned Value:
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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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* Name: 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 must be called with the network locked.
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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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* Name: 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 must be 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_head,
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FAR struct devif_callback_s **list_tail);
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/****************************************************************************
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* Name: 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 must be 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_head,
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FAR struct devif_callback_s **list_tail);
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/****************************************************************************
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* Name: 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 must be 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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* Name: 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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* 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 must be 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, uint16_t flags,
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FAR struct devif_callback_s *list);
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/****************************************************************************
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* Name: 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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* 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 must be 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, 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. The
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* network will automatically crop the data so that only the appropriate
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* amount of data is sent. The mss field of the TCP connection structure
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* can be used to determine 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,
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int len, unsigned int offset);
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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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* This function must be called with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_MM_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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unsigned int target_offset);
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#endif
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/****************************************************************************
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* Name: devif_file_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_file_send() except that the data is
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* in a available file handle.
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_MM_IOB
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int devif_file_send(FAR struct net_driver_s *dev, FAR struct file *file,
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unsigned int len, unsigned int offset,
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unsigned int target_offset);
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#endif
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/****************************************************************************
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* Name: devif_out
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*
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* Description:
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* Common interface to build L2 headers
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*
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* Assumptions:
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* This function is called from the MAC device driver with the network
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* locked.
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*
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****************************************************************************/
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void devif_out(FAR struct net_driver_s *dev);
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/****************************************************************************
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* Name: devif_poll_out
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*
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* Description:
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* Generic callback before device output to build L2 headers before sending
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver with the network
|
|
* locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int devif_poll_out(FAR struct net_driver_s *dev,
|
|
devif_poll_callback_t callback);
|
|
|
|
/****************************************************************************
|
|
* Name: devif_is_loopback
|
|
*
|
|
* Description:
|
|
* The function checks the destination address of the packet to see
|
|
* whether the target of packet is ourself.
|
|
*
|
|
* Returned Value:
|
|
* true is returned if the packet need loop back to ourself, otherwise
|
|
* false is returned.
|
|
*
|
|
****************************************************************************/
|
|
|
|
bool devif_is_loopback(FAR struct net_driver_s *dev);
|
|
|
|
/****************************************************************************
|
|
* Name: devif_loopback
|
|
*
|
|
* Description:
|
|
* This function should be called before sending out a packet. The function
|
|
* checks the destination address of the packet to see whether the target
|
|
* of packet is ourself and then consume the packet directly by calling
|
|
* input process functions.
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned if the packet don't loop back to ourself, otherwise
|
|
* a non-zero value is returned.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int devif_loopback(FAR struct net_driver_s *dev);
|
|
|
|
/****************************************************************************
|
|
* Name: netdev_input
|
|
*
|
|
* Description:
|
|
* This function will copy the flat buffer that does not support
|
|
* Scatter/gather to the iob vector buffer.
|
|
*
|
|
* Compatible with all old flat buffer NICs:
|
|
*
|
|
* [tcp|udp|icmp|...]ipv[4|6]_data_handler()
|
|
* | (iob_concat/append to readahead)
|
|
* |
|
|
* pkt/ipv[4/6]_in()/...
|
|
* |
|
|
* |
|
|
* netdev_input() // new interface, Scatter/gather flat/iobs
|
|
* |
|
|
* |
|
|
* pkt/ipv[4|6]_input()/...
|
|
* |
|
|
* |
|
|
* NICs io vector receive(Original flat buffer)
|
|
*
|
|
* Input Parameters:
|
|
* callback - Input callback of L3 stack
|
|
*
|
|
* Returned Value:
|
|
* A non-zero copy is returned on success.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int netdev_input(FAR struct net_driver_s *dev,
|
|
devif_poll_callback_t callback, bool reply);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET */
|
|
#endif /* __NET_DEVIF_DEVIF_H */
|