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- /****************************************************************************
- * net/utils/net_ipchksum.c
- *
- * Copyright (C) 2007-2010, 2012, 2014-2015, 2017-2018 Gregory Nutt. All
- * rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <stdint.h>
- #include <assert.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/ip.h>
- #include "utils/utils.h"
- #ifdef CONFIG_NET
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define IPv4BUF ((struct ipv4_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
- #define IPv6BUF ((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
- /****************************************************************************
- * 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 sum;
- /* 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]) - IPv4_HDRLEN;
- /* 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, &dev->d_buf[IPv4_HDRLEN + NET_LL_HDRLEN(dev)], 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, &dev->d_buf[NET_LL_HDRLEN(dev) + 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)
- {
- uint16_t sum;
- sum = chksum(0, &dev->d_buf[NET_LL_HDRLEN(dev)], IPv4_HDRLEN);
- return (sum == 0) ? 0xffff : htons(sum);
- }
- #endif /* CONFIG_NET_ARCH_CHKSUM */
- #endif /* CONFIG_NET */
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