305 lines
10 KiB
C
305 lines
10 KiB
C
/****************************************************************************
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* net/pkt/pkt.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef _NET_PKT_PKT_H
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#define _NET_PKT_PKT_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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#include <sys/types.h>
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#ifdef CONFIG_NET_PKT
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Allocate a new packet socket data callback */
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#define pkt_callback_alloc(dev,conn) \
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devif_callback_alloc(dev, &conn->list)
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#define pkt_callback_free(dev,conn,cb) \
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devif_conn_callback_free(dev, cb, &conn->list)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Representation of a uIP packet socket connection */
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struct devif_callback_s; /* Forward reference */
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struct pkt_conn_s
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{
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dq_entry_t node; /* Supports a double linked list */
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uint8_t lmac[6]; /* The local Ethernet address in network byte order */
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uint8_t ifindex;
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uint16_t proto;
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uint8_t crefs; /* Reference counts on this instance */
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/* Defines the list of packet callbacks */
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struct devif_callback_s *list;
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};
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/****************************************************************************
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* Public Data
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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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* Public Function Prototypes
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****************************************************************************/
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struct eth_hdr_s; /* Forward reference */
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/* Defined in pkt_conn.c ****************************************************/
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/****************************************************************************
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* Name: pkt_initialize()
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*
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* Description:
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* Initialize the packet socket connection structures. Called once and
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* only from the network initialization logic.
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*
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****************************************************************************/
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void pkt_initialize(void);
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/****************************************************************************
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* Name: pkt_palloc()
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*
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* Description:
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* Allocate a new, uninitialized packet socket connection structure. This
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* is normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct pkt_conn_s *pkt_alloc(void);
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/****************************************************************************
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* Name: pkt_free()
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*
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* Description:
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* Free a packet socket connection structure that is no longer in use.
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* This should be done by the implementation of close().
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*
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****************************************************************************/
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void pkt_free(FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Name: pkt_active()
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*
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* Description:
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* Find a connection structure that is the appropriate
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* connection to be used with the provided Ethernet header
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*
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* Assumptions:
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* This function is called from UIP logic at interrupt level
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*
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****************************************************************************/
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struct pkt_conn_s *pkt_active(FAR struct eth_hdr_s *buf);
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/****************************************************************************
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* Name: pkt_nextconn()
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*
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* Description:
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* Traverse the list of allocated packet connections
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*
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* Assumptions:
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* This function is called from UIP logic at interrupt level (or with
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* interrupts disabled).
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*
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****************************************************************************/
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struct pkt_conn_s *pkt_nextconn(FAR struct pkt_conn_s *conn);
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/* Defined in pkt_callback.c ************************************************/
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/****************************************************************************
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* Function: pkt_callback
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*
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* Description:
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* Inform the application holding the packet socket of a change in state.
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*
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* Returned Value:
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* OK if packet has been processed, otherwise ERROR.
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*
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* Assumptions:
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* This function is called at the interrupt level with interrupts disabled.
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*
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****************************************************************************/
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uint16_t pkt_callback(FAR struct net_driver_s *dev,
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FAR struct pkt_conn_s *conn, uint16_t flags);
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/* Defined in pkt_input.c ***************************************************/
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/****************************************************************************
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* Name: pkt_input
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*
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* Description:
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* Handle incoming packet input
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*
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* Parameters:
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* dev - The device driver structure containing the received packet
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*
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* Return:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no recv in place to catch the packet yet.
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*
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* Assumptions:
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* Called from the interrupt level or with interrupts disabled.
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*
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****************************************************************************/
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/* pkt_input() is prototyped in include/nuttx/net/pkt.h */
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/****************************************************************************
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* Function: pkt_find_device
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*
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* Description:
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* Select the network driver to use with the PKT transaction.
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*
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* Input Parameters:
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* conn - PKT connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *pkt_find_device(FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Name: pkt_poll
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*
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* Description:
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* Poll a packet "connection" structure for availability of TX data
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The packet "connection" to poll for TX data
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*
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* Return:
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* None
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*
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* Assumptions:
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* Called from the interrupt level or with interrupts disabled.
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*
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****************************************************************************/
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void pkt_poll(FAR struct net_driver_s *dev, FAR struct pkt_conn_s *conn);
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/****************************************************************************
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* Function: psock_pkt_send
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*
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* Description:
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* The psock_pkt_send() call may be used only when the packet socket is in a
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* connected state (so that the intended recipient is known).
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*
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* Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately:
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and the requested operation
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* would block.
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* EBADF
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* An invalid descriptor was specified.
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* ECONNRESET
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* Connection reset by peer.
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* EDESTADDRREQ
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* The socket is not connection-mode, and no peer address is set.
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* EFAULT
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* An invalid user space address was specified for a parameter.
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* EINTR
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* A signal occurred before any data was transmitted.
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* EINVAL
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* Invalid argument passed.
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* EISCONN
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* The connection-mode socket was connected already but a recipient
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* was specified. (Now either this error is returned, or the recipient
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* specification is ignored.)
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* EMSGSIZE
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* The socket type requires that message be sent atomically, and the
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* size of the message to be sent made this impossible.
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* ENOBUFS
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* The output queue for a network interface was full. This generally
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* indicates that the interface has stopped sending, but may be
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* caused by transient congestion.
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* ENOMEM
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* No memory available.
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* ENOTCONN
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* The socket is not connected, and no target has been given.
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* ENOTSOCK
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* The argument s is not a socket.
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* EPIPE
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* The local end has been shut down on a connection oriented socket.
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* In this case the process will also receive a SIGPIPE unless
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* MSG_NOSIGNAL is set.
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*
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* Assumptions:
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*
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****************************************************************************/
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struct socket;
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ssize_t psock_pkt_send(FAR struct socket *psock, FAR const void *buf,
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size_t len);
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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_PKT */
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#endif /* _NET_PKT_PKT_H */
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