447 lines
15 KiB
C
447 lines
15 KiB
C
/****************************************************************************
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* net/utils/utils.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <nuttx/net/netdev.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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* Name: net_breaklock
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*
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* Description:
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* Break the lock, return information needed to restore re-entrant lock
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* state.
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*
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****************************************************************************/
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int net_breaklock(FAR unsigned int *count);
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/****************************************************************************
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* Name: net_restorelock
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*
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* Description:
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* Restore the locked state
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* failured (probably -ECANCELED).
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*
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****************************************************************************/
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int net_restorelock(unsigned int count);
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/****************************************************************************
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* Name: 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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* Input 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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* Name: 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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* Input 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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* Name: 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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* Input 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_getrandom
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*
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* Description:
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* Fill a buffer of arbitrary length with randomness. This function is
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* guaranteed to be success.
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*
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* Input Parameters:
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* bytes - Buffer for returned random bytes
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* nbytes - Number of bytes requested.
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*
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****************************************************************************/
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void net_getrandom(FAR void *bytes, size_t nbytes);
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/****************************************************************************
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* Name: net_ipv4_mask2pref
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*
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* Description:
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* Convert a 32-bit netmask to a prefix length. The NuttX IPv4
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* networking uses 32-bit network masks internally. This function
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* converts the IPv4 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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* Input Parameters:
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* mask An IPv4 netmask in the form of in_addr_t
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*
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* Returned Value:
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* The prefix length, range 0-32 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_IPv4
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uint8_t net_ipv4_mask2pref(in_addr_t mask);
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#endif
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/****************************************************************************
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* Name: net_ipv6_common_pref
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*
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* Description:
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* Calculate the common prefix length of two IPv6 addresses.
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*
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* Input Parameters:
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* a1,a2 Points to IPv6 addresses in the form of uint16_t[8]
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*
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* Returned Value:
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* The common prefix length, range 0-128 on success; This function will
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* not 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_common_pref(FAR const uint16_t *a1, FAR const uint16_t *a2);
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#endif
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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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* Input 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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* Returned Value:
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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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* Name: 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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* Input Parameters:
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* mask - The location to return the netmask.
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* preflen - Determines the width of the netmask (in bits). Range 0-128
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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(net_ipv6addr_t mask, uint8_t preflen);
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#endif
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/****************************************************************************
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* Name: net_ipv6_payload
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*
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* Description:
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* Given a pointer to the IPv6 header, this function will return a pointer
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* to the beginning of the L4 payload.
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*
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* Input Parameters:
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* ipv6 - A pointer to the IPv6 header.
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* proto - The location to return the protocol number in the IPv6 header.
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*
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* Returned Value:
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* A pointer to the beginning of the payload.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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FAR void *net_ipv6_payload(FAR struct ipv6_hdr_s *ipv6, FAR uint8_t *proto);
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#endif
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/****************************************************************************
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* Name: net_iob_concat
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*
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* Description:
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* Concatenate iob_s chain iob2 to iob1, if CONFIG_NET_RECV_PACK is
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* endabled, pack all data in the I/O buffer chain.
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*
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* Returned Value:
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* The number of bytes actually buffered is returned. This will be either
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* zero or equal to iob1->io_pktlen.
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*
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****************************************************************************/
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#ifdef CONFIG_MM_IOB
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uint16_t net_iob_concat(FAR struct iob_s **iob1, FAR struct iob_s **iob2);
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#endif
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/****************************************************************************
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* Name: net_chksum_adjust
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*
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* Description:
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* Adjusts the checksum of a packet without having to completely
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* recalculate it, as described in RFC 3022, Section 4.2, Page 9.
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*
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* Input Parameters:
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* chksum - points to the chksum in the packet
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* optr - points to the old data in the packet
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* olen - length of old data
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* nptr - points to the new data in the packet
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* nlen - length of new data
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*
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* Limitations:
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* The algorithm is applicable only for even offsets and even lengths.
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*
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****************************************************************************/
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void net_chksum_adjust(FAR uint16_t *chksum,
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FAR const uint16_t *optr, ssize_t olen,
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FAR const uint16_t *nptr, ssize_t nlen);
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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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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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#ifdef CONFIG_NET_ICMP
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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: icmp_chksum_iob
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*
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* Description:
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* Calculate the checksum of the ICMP message, the input can be an I/O
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* buffer chain
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*
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****************************************************************************/
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#if defined(CONFIG_NET_ICMP) && defined(CONFIG_MM_IOB)
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uint16_t icmp_chksum_iob(FAR struct iob_s *iob);
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#endif /* CONFIG_NET_ICMP && CONFIG_MM_IOB */
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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, unsigned int iplen);
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#endif
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/****************************************************************************
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* Name: cmsg_append
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*
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* Description:
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* Append specified data into the control message, msg_control and
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* msg_controllen will be changed to the appropriate value when success
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*
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* Input Parameters:
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* msg - Buffer to receive the message.
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* level - The level of control message.
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* type - The type of control message.
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* value - If the value is not NULL, this interface copies the data
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* to the appropriate location in msg_control, and modify
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* msg_control and msg_controllen.
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* If the value is NULL, just modify the corresponding value
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* of msg.
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* value_len - The value length of control message.
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*
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* Returned Value:
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* On success, a pointer to the start address of control message data,
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* the caller can copy the data in.
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* On failure, return NULL, because of msg_controllen is not enough
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*
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****************************************************************************/
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FAR void *cmsg_append(FAR struct msghdr *msg, int level, int type,
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FAR void *value, int value_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 /* __NET_UTILS_UTILS_H */
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