284 lines
9.3 KiB
C
284 lines
9.3 KiB
C
/****************************************************************************
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* net/utils/utils.h
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*
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* Copyright (C) 2014-2015 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_UTILS_UTILS_H
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#define __NET_UTILS_UTILS_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 <nuttx/net/net.h>
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#include <nuttx/net/ip.h>
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* These values control the behavior of net_timeval2desc */
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enum tv2ds_remainder_e
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{
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TV2DS_TRUNC = 0, /* Truncate microsecond remainder */
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TV2DS_ROUND, /* Round to the nearest full decisecond */
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TV2DS_CEIL /* Force to next larger full decisecond */
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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 net_driver_s; /* Forward reference */
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struct timeval; /* Forward reference */
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/****************************************************************************
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* Function: net_lockinitialize
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*
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* Description:
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* Initialize the locking facility
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*
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****************************************************************************/
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void net_lockinitialize(void);
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/****************************************************************************
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* Function: net_dsec2timeval
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*
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* Description:
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* Convert a decisecond value to a struct timeval. Needed by getsockopt()
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* to report timeout values.
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*
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* Parameters:
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* dsec The decisecond value to convert
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* tv The struct timeval to receive the converted value
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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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*
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****************************************************************************/
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void net_dsec2timeval(uint16_t dsec, FAR struct timeval *tv);
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/****************************************************************************
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* Function: net_dsec2tick
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*
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* Description:
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* Convert a decisecond value to a system clock ticks. Used by IGMP logic.
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*
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* Parameters:
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* dsec The decisecond value to convert
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*
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* Returned Value:
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* The decisecond value expressed as system clock ticks
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*
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****************************************************************************/
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unsigned int net_dsec2tick(int dsec);
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/****************************************************************************
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* Function: net_timeval2dsec
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*
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* Description:
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* Convert a struct timeval to deciseconds. Needed by setsockopt() to
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* save new timeout values.
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*
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* Parameters:
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* tv - The struct timeval to convert
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* remainder - Determines how to handler the microsecond remainder
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*
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* Returned Value:
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* The converted value
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*
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* Assumptions:
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*
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****************************************************************************/
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unsigned int net_timeval2dsec(FAR struct timeval *tv,
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enum tv2ds_remainder_e remainder);
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/****************************************************************************
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* Name: net_ipv6_mask2pref
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*
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* Description:
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* Convert a 128-bit netmask to a prefix length. The Nuttx IPv6
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* networking uses 128-bit network masks internally. This function
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* converts the IPv6 netmask to a prefix length.
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*
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* The prefix length is the number of MS '1' bits on in the netmask.
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* This, of course, assumes that all MS bits are '1' and all LS bits are
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* '0' with no intermixed 1's and 0's. This function searches from the MS
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* bit until the first '0' is found (this does not necessary mean that
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* there might not be additional '1' bits following the firs '0', but that
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* will be a malformed netmask.
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*
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* Parameters:
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* mask Points to an IPv6 netmask in the form of uint16_t[8]
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*
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* Return:
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* The prefix length, range 0-128 on success; This function will not
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* fail.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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uint8_t net_ipv6_mask2pref(FAR const uint16_t *mask);
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#endif
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/****************************************************************************
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* Function: net_ipv6_pref2mask
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*
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* Description:
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* Convert a IPv6 prefix length to a network mask. The prefix length
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* specifies the number of MS bits under mask (0-128)
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*
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* Parameters:
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* preflen - Determines the width of the netmask (in bits). Range 0-128
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* mask - The location to return the netmask.
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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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#ifdef CONFIG_NET_IPv6
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void net_ipv6_pref2mask(uint8_t preflen, net_ipv6addr_t mask);
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#endif
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/****************************************************************************
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* Name: tcp_chksum, tcp_ipv4_chksum, and tcp_ipv6_chksum
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*
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* Description:
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* Calculate the TCP checksum of the packet in d_buf and d_appdata.
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*
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* The TCP checksum is the Internet checksum of data contents of the
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* TCP segment, and a pseudo-header as defined in RFC793.
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*
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* Note: The d_appdata pointer that points to the packet data may
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* point anywhere in memory, so it is not possible to simply calculate
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* the Internet checksum of the contents of the d_buf buffer.
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*
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* Returned Value:
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* The TCP checksum of the TCP segment in d_buf and pointed to by
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* d_appdata.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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uint16_t tcp_ipv4_chksum(FAR struct net_driver_s *dev);
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#endif
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#ifdef CONFIG_NET_IPv6
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/* REVIST: Is this used? */
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uint16_t tcp_ipv6_chksum(FAR struct net_driver_s *dev);
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#endif
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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uint16_t tcp_chksum(FAR struct net_driver_s *dev);
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#elif defined(CONFIG_NET_IPv4)
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# define tcp_chksum(d) tcp_ipv4_chksum(d)
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#else /* if defined(CONFIG_NET_IPv6) */
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# define tcp_chksum(d) tcp_ipv6_chksum(d)
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#endif
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/****************************************************************************
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* Name: udp_ipv4_chksum
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*
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* Description:
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* Calculate the UDP/IPv4 checksum of the packet in d_buf and d_appdata.
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*
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****************************************************************************/
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#if defined(CONFIG_NET_UDP_CHECKSUMS) && defined(CONFIG_NET_IPv4)
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uint16_t udp_ipv4_chksum(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_ipv6_chksum
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*
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* Description:
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* Calculate the UDP/IPv6 checksum of the packet in d_buf and d_appdata.
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*
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****************************************************************************/
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#if defined(CONFIG_NET_UDP_CHECKSUMS) && defined(CONFIG_NET_IPv6)
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uint16_t udp_ipv6_chksum(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: icmp_chksum
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*
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* Description:
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* Calculate the checksum of the IPv4 ICMP message
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*
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****************************************************************************/
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#if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_PING)
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uint16_t icmp_chksum(FAR struct net_driver_s *dev, int len);
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#endif
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/****************************************************************************
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* Name: icmpv6_chksum
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*
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* Description:
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* Calculate the checksum of the ICMPv6 message
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMPv6
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uint16_t icmpv6_chksum(FAR struct net_driver_s *dev);
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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 /* __NET_UTILS_UTILS_H */
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