/**************************************************************************** * net/utils/utils.h * * Copyright (C) 2014-2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef __NET_UTILS_UTILS_H #define __NET_UTILS_UTILS_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include /**************************************************************************** * Public Types ****************************************************************************/ /* These values control the behavior of net_timeval2desc */ enum tv2ds_remainder_e { TV2DS_TRUNC = 0, /* Truncate microsecond remainder */ TV2DS_ROUND, /* Round to the nearest full decisecond */ TV2DS_CEIL /* Force to next larger full decisecond */ }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ struct net_driver_s; /* Forward reference */ struct timeval; /* Forward reference */ /**************************************************************************** * Name: net_lockinitialize * * Description: * Initialize the locking facility * ****************************************************************************/ void net_lockinitialize(void); /**************************************************************************** * Name: net_breaklock * * Description: * Break the lock, return information needed to restore re-entrant lock * state. * ****************************************************************************/ int net_breaklock(FAR unsigned int *count); /**************************************************************************** * Name: net_restorelock * * Description: * Restore the locked state * * Returned Value: * Zero (OK) is returned on success; a negated errno value is returned on * failured (probably -ECANCELED). * ****************************************************************************/ int net_restorelock(unsigned int count); /**************************************************************************** * Name: net_dsec2timeval * * Description: * Convert a decisecond value to a struct timeval. Needed by getsockopt() * to report timeout values. * * Input Parameters: * dsec The decisecond value to convert * tv The struct timeval to receive the converted value * * Returned Value: * None * * Assumptions: * ****************************************************************************/ void net_dsec2timeval(uint16_t dsec, FAR struct timeval *tv); /**************************************************************************** * Name: net_dsec2tick * * Description: * Convert a decisecond value to a system clock ticks. Used by IGMP logic. * * Input Parameters: * dsec The decisecond value to convert * * Returned Value: * The decisecond value expressed as system clock ticks * ****************************************************************************/ unsigned int net_dsec2tick(int dsec); /**************************************************************************** * Name: net_timeval2dsec * * Description: * Convert a struct timeval to deciseconds. Needed by setsockopt() to * save new timeout values. * * Input Parameters: * tv - The struct timeval to convert * remainder - Determines how to handler the microsecond remainder * * Returned Value: * The converted value * * Assumptions: * ****************************************************************************/ unsigned int net_timeval2dsec(FAR struct timeval *tv, enum tv2ds_remainder_e remainder); /**************************************************************************** * Name: net_ipv6_mask2pref * * Description: * Convert a 128-bit netmask to a prefix length. The Nuttx IPv6 * networking uses 128-bit network masks internally. This function * converts the IPv6 netmask to a prefix length. * * The prefix length is the number of MS '1' bits on in the netmask. * This, of course, assumes that all MS bits are '1' and all LS bits are * '0' with no intermixed 1's and 0's. This function searches from the MS * bit until the first '0' is found (this does not necessary mean that * there might not be additional '1' bits following the firs '0', but that * will be a malformed netmask. * * Input Parameters: * mask Points to an IPv6 netmask in the form of uint16_t[8] * * Returned Value: * The prefix length, range 0-128 on success; This function will not * fail. * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 uint8_t net_ipv6_mask2pref(FAR const uint16_t *mask); #endif /**************************************************************************** * Name: net_ipv6_pref2mask * * Description: * Convert a IPv6 prefix length to a network mask. The prefix length * specifies the number of MS bits under mask (0-128) * * Input Parameters: * preflen - Determines the width of the netmask (in bits). Range 0-128 * mask - The location to return the netmask. * * Returned Value: * None * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 void net_ipv6_pref2mask(uint8_t preflen, net_ipv6addr_t mask); #endif /**************************************************************************** * Name: chksum * * Description: * Calculate the raw change some over the memory region described by * data and len. * * Input Parameters: * sum - Partial calculations carried over from a previous call to chksum(). * This should be zero on the first time that check sum is called. * data - Beginning of the data to include in the checksum. * len - Length of the data to include in the checksum. * * Returned Value: * The updated checksum value. * ****************************************************************************/ uint16_t chksum(uint16_t sum, FAR const uint8_t *data, uint16_t len); /**************************************************************************** * Name: net_chksum * * Description: * Calculate the Internet checksum over a buffer. * * The Internet checksum is the one's complement of the one's complement * sum of all 16-bit words in the buffer. * * See RFC1071. * * If CONFIG_NET_ARCH_CHKSUM is defined, then this function must be * provided by architecture-specific logic. * * Input Parameters: * * buf - A pointer to the buffer over which the checksum is to be computed. * * len - The length of the buffer over which the checksum is to be computed. * * Returned Value: * The Internet checksum of the buffer. * ****************************************************************************/ uint16_t net_chksum(FAR uint16_t *data, uint16_t len); /**************************************************************************** * Name: ipv4_upperlayer_chksum * * Description: * Perform the checksum calcaultion over the IPv4, protocol headers, and * data payload as necessary. * * Input Parameters: * dev - The network driver instance. The packet data is in the d_buf * of the device. * proto - The protocol being supported * * Returned Value: * The calculated checksum * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 uint16_t ipv4_upperlayer_chksum(FAR struct net_driver_s *dev, uint8_t proto); #endif /**************************************************************************** * Name: ipv6_upperlayer_chksum * * Description: * Perform the checksum calculation over the IPv6, protocol headers, and * data payload as necessary. * * Input Parameters: * dev - The network driver instance. The packet data is in the d_buf * of the device. * proto - The protocol being supported * iplen - The size of the IPv6 header. This may be larger than * IPv6_HDRLEN the IPv6 header if IPv6 extension headers are * present. * * Returned Value: * The calculated checksum * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 uint16_t ipv6_upperlayer_chksum(FAR struct net_driver_s *dev, uint8_t proto, unsigned int iplen); #endif /**************************************************************************** * Name: tcp_chksum, tcp_ipv4_chksum, and tcp_ipv6_chksum * * Description: * Calculate the TCP checksum of the packet in d_buf and d_appdata. * * The TCP checksum is the Internet checksum of data contents of the * TCP segment, and a pseudo-header as defined in RFC793. * * Note: The d_appdata pointer that points to the packet data may * point anywhere in memory, so it is not possible to simply calculate * the Internet checksum of the contents of the d_buf buffer. * * Returned Value: * The TCP checksum of the TCP segment in d_buf and pointed to by * d_appdata. * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 uint16_t tcp_ipv4_chksum(FAR struct net_driver_s *dev); #endif #ifdef CONFIG_NET_IPv6 uint16_t tcp_ipv6_chksum(FAR struct net_driver_s *dev); #endif #if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6) uint16_t tcp_chksum(FAR struct net_driver_s *dev); #elif defined(CONFIG_NET_IPv4) # define tcp_chksum(d) tcp_ipv4_chksum(d) #else /* if defined(CONFIG_NET_IPv6) */ # define tcp_chksum(d) tcp_ipv6_chksum(d) #endif /**************************************************************************** * Name: udp_ipv4_chksum * * Description: * Calculate the UDP/IPv4 checksum of the packet in d_buf and d_appdata. * ****************************************************************************/ #if defined(CONFIG_NET_UDP_CHECKSUMS) && defined(CONFIG_NET_IPv4) uint16_t udp_ipv4_chksum(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Name: udp_ipv6_chksum * * Description: * Calculate the UDP/IPv6 checksum of the packet in d_buf and d_appdata. * ****************************************************************************/ #if defined(CONFIG_NET_UDP_CHECKSUMS) && defined(CONFIG_NET_IPv6) uint16_t udp_ipv6_chksum(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Name: icmp_chksum * * Description: * Calculate the checksum of the IPv4 ICMP message * ****************************************************************************/ #if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET) uint16_t icmp_chksum(FAR struct net_driver_s *dev, int len); #endif /**************************************************************************** * Name: icmpv6_chksum * * Description: * Calculate the checksum of the ICMPv6 message * ****************************************************************************/ #ifdef CONFIG_NET_ICMPv6 uint16_t icmpv6_chksum(FAR struct net_driver_s *dev, unsigned int iplen); #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* __NET_UTILS_UTILS_H */