209 lines
6.6 KiB
C
209 lines
6.6 KiB
C
/****************************************************************************
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* net/utils/net_ipchksum.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/ip.h>
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#include "utils/utils.h"
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#ifdef CONFIG_NET
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define IPv4BUF ((FAR struct ipv4_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ipv4_upperlayer_chksum
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*
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* Description:
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* Perform the checksum calculation over the IPv4, protocol headers, and
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* data payload as necessary.
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*
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* Input Parameters:
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* dev - The network driver instance. The packet data is in the d_buf
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* of the device.
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* proto - The protocol being supported
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*
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* Returned Value:
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* The calculated checksum
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*
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****************************************************************************/
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#if !defined(CONFIG_NET_ARCH_CHKSUM) && defined(CONFIG_NET_IPv4)
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uint16_t ipv4_upperlayer_chksum(FAR struct net_driver_s *dev, uint8_t proto)
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{
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FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
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uint16_t upperlen;
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uint16_t iphdrlen;
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uint16_t sum;
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/* Get the IP header length (accounting for possible options). */
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iphdrlen = (ipv4->vhl & IPv4_HLMASK) << 2;
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/* The length reported in the IPv4 header is the length of both the IPv4
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* header and the payload that follows the header. We need to subtract
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* the size of the IPv4 header to get the size of the payload.
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*/
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upperlen = (((uint16_t)(ipv4->len[0]) << 8) + ipv4->len[1]) - iphdrlen;
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/* Verify some minimal assumptions */
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if (upperlen > NETDEV_PKTSIZE(dev))
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{
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return 0;
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}
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/* First sum pseudo-header.
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*
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* IP protocol and length fields. This addition cannot carry.
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*/
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sum = upperlen + proto;
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/* Sum IP source and destination addresses. */
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sum = chksum(sum, (FAR uint8_t *)&ipv4->srcipaddr, 2 * sizeof(in_addr_t));
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/* Sum IP payload data. */
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sum = chksum(sum, &dev->d_buf[iphdrlen + NET_LL_HDRLEN(dev)], upperlen);
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return (sum == 0) ? 0xffff : HTONS(sum);
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}
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#endif /* CONFIG_NET_ARCH_CHKSUM */
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/****************************************************************************
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* Name: ipv6_upperlayer_chksum
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*
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* Description:
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* Perform the checksum calculation over the IPv6, protocol headers, and
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* data payload as necessary.
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*
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* Input Parameters:
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* dev - The network driver instance. The packet data is in the d_buf
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* of the device.
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* proto - The protocol being supported
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* iplen - The size of the IPv6 header. This may be larger than
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* IPv6_HDRLEN the IPv6 header if IPv6 extension headers are
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* present.
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*
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* Returned Value:
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* The calculated checksum
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*
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****************************************************************************/
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#if !defined(CONFIG_NET_ARCH_CHKSUM) && defined(CONFIG_NET_IPv6)
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uint16_t ipv6_upperlayer_chksum(FAR struct net_driver_s *dev,
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uint8_t proto, unsigned int iplen)
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{
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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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uint16_t upperlen;
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uint16_t sum;
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DEBUGASSERT(dev != NULL && iplen >= IPv6_HDRLEN);
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/* The length reported in the IPv6 header is the length of the payload
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* that follows the header. If extension heders are present, then this
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* size includes the size of the IPv6 extension headers.
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*/
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upperlen = ((uint16_t)ipv6->len[0] << 8) + ipv6->len[1];
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/* Adjust for the presence of any extension headers */
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upperlen -= (iplen - IPv6_HDRLEN);
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/* Verify some minimal assumptions */
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if (upperlen > NETDEV_PKTSIZE(dev))
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{
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return 0;
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}
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/* The checksum is calculated starting with a pseudo-header of IPv6 header
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* fields according to the IPv6 standard, which consists of the source
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* and destination addresses, the packet length and the next header field.
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*/
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sum = upperlen + proto;
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/* Sum IP source and destination addresses. */
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sum = chksum(sum, (FAR uint8_t *)&ipv6->srcipaddr,
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2 * sizeof(net_ipv6addr_t));
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/* Sum IP payload data. */
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sum = chksum(sum, &dev->d_buf[NET_LL_HDRLEN(dev) + iplen], upperlen);
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return (sum == 0) ? 0xffff : HTONS(sum);
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}
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#endif /* CONFIG_NET_ARCH_CHKSUM */
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/****************************************************************************
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* Name: ipv4_chksum
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*
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* Description:
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* Calculate the IPv4 header checksum of the packet header in d_buf.
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*
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* The IPv4 header checksum is the Internet checksum of the 20 bytes of
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* the IPv4 header.
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*
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* If CONFIG_NET_ARCH_CHKSUM is defined, then this function must be
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* provided by architecture-specific logic.
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*
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* Returned Value:
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* The IPv4 header checksum of the IPv4 header in the d_buf buffer.
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*
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****************************************************************************/
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#if defined(CONFIG_NET_IPv4) && !defined(CONFIG_NET_ARCH_CHKSUM)
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uint16_t ipv4_chksum(FAR struct net_driver_s *dev)
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{
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FAR struct ipv4_hdr_s *ipv4 = IPv4BUF;
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uint16_t iphdrlen;
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uint16_t sum;
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/* Get the IP header length (accounting for possible options). */
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iphdrlen = (ipv4->vhl & IPv4_HLMASK) << 2;
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sum = chksum(0, &dev->d_buf[NET_LL_HDRLEN(dev)], iphdrlen);
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return (sum == 0) ? 0xffff : HTONS(sum);
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}
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#endif /* CONFIG_NET_ARCH_CHKSUM */
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#endif /* CONFIG_NET */
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