75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/****************************************************************************
|
|
* net/utils/net_ipv6_payload.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 <nuttx/net/ip.h>
|
|
#include <nuttx/net/ipv6ext.h>
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: net_ipv6_payload
|
|
*
|
|
* Description:
|
|
* Given a pointer to the IPv6 header, this function will return a pointer
|
|
* to the beginning of the L4 payload.
|
|
*
|
|
* Input Parameters:
|
|
* ipv6 - A pointer to the IPv6 header.
|
|
* proto - The location to return the protocol number in the IPv6 header.
|
|
*
|
|
* Returned Value:
|
|
* A pointer to the beginning of the payload.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR void *net_ipv6_payload(FAR struct ipv6_hdr_s *ipv6, FAR uint8_t *proto)
|
|
{
|
|
FAR struct ipv6_extension_s *exthdr;
|
|
FAR uint8_t *payload = (FAR uint8_t *)ipv6 + IPv6_HDRLEN;
|
|
uint8_t nxthdr = ipv6->proto;
|
|
uint16_t extlen;
|
|
|
|
while (ipv6_exthdr(nxthdr))
|
|
{
|
|
/* Just skip over the extension header */
|
|
|
|
exthdr = (FAR struct ipv6_extension_s *)payload;
|
|
extlen = EXTHDR_LEN(exthdr->len);
|
|
|
|
payload += extlen;
|
|
nxthdr = exthdr->nxthdr;
|
|
}
|
|
|
|
*proto = nxthdr;
|
|
return payload;
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IPv6 */
|