394 lines
13 KiB
C
394 lines
13 KiB
C
/****************************************************************************
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* net/icmp/icmp.h
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*
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* Copyright (C) 2014, 2019 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_ICMP_ICMP_H
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#define __NET_ICMP_ICMP_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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#include <stdint.h>
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#include <queue.h>
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#include <assert.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/netdev.h>
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#if defined(CONFIG_NET_ICMP) && !defined(CONFIG_NET_ICMP_NO_STACK)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NET_ICMP_HAVE_STACK 1
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/* Allocate/free an ICMP data callback */
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#define icmp_callback_alloc(dev, conn) \
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devif_callback_alloc((dev), &(conn)->list)
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#define icmp_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 types
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****************************************************************************/
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struct socket; /* Forward reference */
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struct sockaddr; /* Forward reference */
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struct pollfd; /* Forward reference */
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#ifdef CONFIG_NET_ICMP_SOCKET
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/* Representation of a IPPROTO_ICMP socket connection */
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struct devif_callback_s; /* Forward reference */
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/* This is a container that holds the poll-related information */
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struct icmp_poll_s
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{
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FAR struct socket *psock; /* IPPROTO_ICMP socket structure */
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FAR struct pollfd *fds; /* Needed to handle poll events */
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FAR struct devif_callback_s *cb; /* Needed to teardown the poll */
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};
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struct icmp_conn_s
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{
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/* Common prologue of all connection structures. */
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dq_entry_t node; /* Supports a doubly linked list */
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/* This is a list of ICMP callbacks. Each callback represents a thread
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* that is stalled, waiting for a device-specific event.
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*/
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FAR struct devif_callback_s *list;
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/* ICMP-specific content follows */
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uint16_t id; /* ICMP ECHO request ID */
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uint8_t nreqs; /* Number of requests with no response received */
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uint8_t crefs; /* Reference counts on this instance */
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/* The device that the ICMP request was sent on */
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FAR struct net_driver_s *dev; /* Needed to free the callback structure */
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/* ICMP response read-ahead list. A singly linked list of type struct
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* iob_qentry_s where the ICMP read-ahead data for the current ID is
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* retained.
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*/
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struct iob_queue_s readahead; /* Read-ahead buffering */
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/* The following is a list of poll structures of threads waiting for
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* socket events.
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*/
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struct icmp_poll_s pollinfo[CONFIG_NET_ICMP_NPOLLWAITERS];
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};
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#endif
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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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#ifdef CONFIG_NET_ICMP_SOCKET
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/* PF_INET socket address family, IPPROTO_ICMP protocol interface */
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EXTERN const struct sock_intf_s g_icmp_sockif;
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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: icmp_input
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*
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* Description:
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* Handle incoming ICMP input
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*
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* Input Parameters:
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* dev - The device driver structure containing the received ICMP
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* packet
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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void icmp_input(FAR struct net_driver_s *dev);
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/****************************************************************************
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* Name: icmp_sock_initialize
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*
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* Description:
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* Initialize the IPPROTO_ICMP socket connection structures. Called once
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* and only from the network initialization layer.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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void icmp_sock_initialize(void);
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#endif
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/****************************************************************************
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* Name: icmp_alloc
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*
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* Description:
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* Allocate a new, uninitialized IPPROTO_ICMP socket connection structure.
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* This is normally something done by the implementation of the socket()
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* interface.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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FAR struct icmp_conn_s *icmp_alloc(void);
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#endif
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/****************************************************************************
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* Name: icmp_free
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*
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* Description:
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* Free a IPPROTO_ICMP socket connection structure that is no longer in
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* use. This should be done by the implementation of close().
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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void icmp_free(FAR struct icmp_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: icmp_active()
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*
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* Description:
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* Find a connection structure that is the appropriate connection to be
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* used with the provided ECHO request ID.
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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FAR struct icmp_conn_s *icmp_active(uint16_t id);
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#endif
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/****************************************************************************
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* Name: icmp_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 network logic at with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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FAR struct icmp_conn_s *icmp_nextconn(FAR struct icmp_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: icmp_findconn
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*
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* Description:
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* Find an ICMP connection structure that is expecting a ICMP ECHO response
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* with this ID from this device
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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FAR struct icmp_conn_s *icmp_findconn(FAR struct net_driver_s *dev,
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uint16_t id);
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#endif
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/****************************************************************************
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* Name: icmp_poll
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*
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* Description:
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* Poll a device "connection" structure for availability of ICMP TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - A pointer to the ICMP connection structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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void icmp_poll(FAR struct net_driver_s *dev, FAR struct icmp_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: icmp_sendto
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*
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* Description:
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* Implements the sendto() operation for the case of the IPPROTO_ICMP
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* socket. The 'buf' parameter points to a block of memory that includes
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* an ICMP request header, followed by any payload that accompanies the
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* request. The 'len' parameter includes both the size of the ICMP header
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* and the following payload.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, 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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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error, a negated
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* errno value is returned (see send_to() for the list of appropriate error
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* values.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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ssize_t icmp_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen);
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#endif
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/****************************************************************************
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* Name: icmp_recvfrom
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*
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* Description:
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* Implements the socket recvfrom interface for the case of the AF_INET
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* data gram socket with the IPPROTO_ICMP protocol. icmp_recvfrom()
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* receives ICMP ECHO replies for the a socket.
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*
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* If 'from' is not NULL, and the underlying protocol provides the source
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* address, this source address is filled in. The argument 'fromlen' is
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* initialized to the size of the buffer associated with from, and
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* modified on return to indicate the actual size of the address stored
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* there.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recv() will return 0. Otherwise, on errors, a negated errno value is
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* returned (see recvfrom() for the list of appropriate error values).
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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ssize_t icmp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
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int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen);
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#endif
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/****************************************************************************
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* Name: icmp_pollsetup
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*
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* Description:
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* Setup to monitor events on one ICMP socket
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*
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* Input Parameters:
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* psock - The IPPROTO_ICMP socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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int icmp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
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#endif
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/****************************************************************************
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* Name: icmp_pollteardown
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*
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* Description:
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* Teardown monitoring of events on an ICMP socket
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*
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* Input Parameters:
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* psock - The IPPROTO_ICMP socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_SOCKET
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int icmp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
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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_ICMP && !CONFIG_NET_ICMP_NO_STACK */
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#endif /* __NET_ICMP_ICMP_H */
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