202 lines
6.2 KiB
C
202 lines
6.2 KiB
C
/****************************************************************************
|
|
* net/utils/net_ipchksum.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <assert.h>
|
|
|
|
#include <nuttx/net/netdev.h>
|
|
#include <nuttx/net/ip.h>
|
|
|
|
#include "utils/utils.h"
|
|
|
|
#ifdef CONFIG_NET
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: ipv4_upperlayer_chksum
|
|
*
|
|
* Description:
|
|
* Perform the checksum calculation 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if !defined(CONFIG_NET_ARCH_CHKSUM) && defined(CONFIG_NET_IPv4)
|
|
uint16_t ipv4_upperlayer_chksum(FAR struct net_driver_s *dev, uint8_t proto)
|
|
{
|
|
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
|
|
uint16_t upperlen;
|
|
uint16_t iphdrlen;
|
|
uint16_t sum;
|
|
|
|
/* Get the IP header length (accounting for possible options). */
|
|
|
|
iphdrlen = (ipv4->vhl & IPv4_HLMASK) << 2;
|
|
|
|
/* The length reported in the IPv4 header is the length of both the IPv4
|
|
* header and the payload that follows the header. We need to subtract
|
|
* the size of the IPv4 header to get the size of the payload.
|
|
*/
|
|
|
|
upperlen = (((uint16_t)(ipv4->len[0]) << 8) + ipv4->len[1]) - iphdrlen;
|
|
|
|
/* Verify some minimal assumptions */
|
|
|
|
if (upperlen > NETDEV_PKTSIZE(dev))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* First sum pseudo-header.
|
|
*
|
|
* IP protocol and length fields. This addition cannot carry.
|
|
*/
|
|
|
|
sum = upperlen + proto;
|
|
|
|
/* Sum IP source and destination addresses. */
|
|
|
|
sum = chksum(sum, (FAR uint8_t *)&ipv4->srcipaddr, 2 * sizeof(in_addr_t));
|
|
|
|
/* Sum IP payload data. */
|
|
|
|
sum = chksum(sum, IPBUF(iphdrlen), upperlen);
|
|
return (sum == 0) ? 0xffff : HTONS(sum);
|
|
}
|
|
#endif /* CONFIG_NET_ARCH_CHKSUM */
|
|
|
|
/****************************************************************************
|
|
* 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if !defined(CONFIG_NET_ARCH_CHKSUM) && defined(CONFIG_NET_IPv6)
|
|
uint16_t ipv6_upperlayer_chksum(FAR struct net_driver_s *dev,
|
|
uint8_t proto, unsigned int iplen)
|
|
{
|
|
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
|
|
uint16_t upperlen;
|
|
uint16_t sum;
|
|
|
|
DEBUGASSERT(dev != NULL && iplen >= IPv6_HDRLEN);
|
|
|
|
/* The length reported in the IPv6 header is the length of the payload
|
|
* that follows the header. If extension heders are present, then this
|
|
* size includes the size of the IPv6 extension headers.
|
|
*/
|
|
|
|
upperlen = ((uint16_t)ipv6->len[0] << 8) + ipv6->len[1];
|
|
|
|
/* Adjust for the presence of any extension headers */
|
|
|
|
upperlen -= (iplen - IPv6_HDRLEN);
|
|
|
|
/* Verify some minimal assumptions */
|
|
|
|
if (upperlen > NETDEV_PKTSIZE(dev))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* The checksum is calculated starting with a pseudo-header of IPv6 header
|
|
* fields according to the IPv6 standard, which consists of the source
|
|
* and destination addresses, the packet length and the next header field.
|
|
*/
|
|
|
|
sum = upperlen + proto;
|
|
|
|
/* Sum IP source and destination addresses. */
|
|
|
|
sum = chksum(sum, (FAR uint8_t *)&ipv6->srcipaddr,
|
|
2 * sizeof(net_ipv6addr_t));
|
|
|
|
/* Sum IP payload data. */
|
|
|
|
sum = chksum(sum, IPBUF(iplen), upperlen);
|
|
return (sum == 0) ? 0xffff : HTONS(sum);
|
|
}
|
|
#endif /* CONFIG_NET_ARCH_CHKSUM */
|
|
|
|
/****************************************************************************
|
|
* Name: ipv4_chksum
|
|
*
|
|
* Description:
|
|
* Calculate the IPv4 header checksum of the packet header in d_buf.
|
|
*
|
|
* The IPv4 header checksum is the Internet checksum of the 20 bytes of
|
|
* the IPv4 header.
|
|
*
|
|
* If CONFIG_NET_ARCH_CHKSUM is defined, then this function must be
|
|
* provided by architecture-specific logic.
|
|
*
|
|
* Returned Value:
|
|
* The IPv4 header checksum of the IPv4 header in the d_buf buffer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_IPv4) && !defined(CONFIG_NET_ARCH_CHKSUM)
|
|
uint16_t ipv4_chksum(FAR struct net_driver_s *dev)
|
|
{
|
|
FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
|
|
uint16_t iphdrlen;
|
|
uint16_t sum;
|
|
|
|
/* Get the IP header length (accounting for possible options). */
|
|
|
|
iphdrlen = (ipv4->vhl & IPv4_HLMASK) << 2;
|
|
|
|
sum = chksum(0, IPBUF(0), iphdrlen);
|
|
return (sum == 0) ? 0xffff : HTONS(sum);
|
|
}
|
|
#endif /* CONFIG_NET_ARCH_CHKSUM */
|
|
|
|
#endif /* CONFIG_NET */
|