82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
/****************************************************************************
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* net/inet/ipv6_build_header.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 <debug.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/netconfig.h>
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#include "inet.h"
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#ifdef CONFIG_NET_IPv6
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ipv6_build_header
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*
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* Description:
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* build IPv6 header
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*
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* Input Parameters:
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* ipv6 Pointer to IPv6 header's buffer
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* payload_len Length of the IPv6 payload(without IPv6 header length)
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* prot Type of header immediately following the IPv6 header
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* src_ip Source IPv6 address
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* dst_ip Destination IPv6 address
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* ttl Time to live(IPv4) hop limit(IPv6)
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*
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* Returned Value:
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* length of IPv6 header
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*
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****************************************************************************/
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uint16_t ipv6_build_header(FAR struct ipv6_hdr_s *ipv6, uint16_t payload_len,
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uint16_t prot, const net_ipv6addr_t src_ip,
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const net_ipv6addr_t dst_ip, uint8_t ttl)
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{
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/* Set up the IPv6 header */
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ipv6->vtc = 0x60; /* Version/traffic class (MS) */
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ipv6->tcf = 0; /* Traffic class(LS)/Flow label(MS) */
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ipv6->flow = 0; /* Flow label (LS) */
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ipv6->len[0] = (payload_len >> 8); /* Length excludes the IPv6 header */
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ipv6->len[1] = (payload_len & 0xff);
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ipv6->proto = prot; /* Next header */
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ipv6->ttl = ttl;
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/* It's possible to use srcip to initialize destip */
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net_ipv6addr_hdrcopy(ipv6->destipaddr, dst_ip);
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net_ipv6addr_hdrcopy(ipv6->srcipaddr, src_ip);
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ninfo("IPv6 Payload length: %d\n", payload_len);
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return IPv6_HDRLEN;
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}
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#endif /* CONFIG_NET_IPv6 */
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