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net/utils: Add net_ipv6_payload to get IPv6 L4 payload

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Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
This commit is contained in:
Zhe Weng 2024-03-18 18:22:50 +08:00 committed by Xiang Xiao
parent f2ff5cee03
commit 676826cb7c
4 changed files with 96 additions and 2 deletions
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2
net/utils/CMakeLists.txt
View file

@ -37,7 +37,7 @@ set(SRCS
# IPv6 utilities
if(CONFIG_NET_IPv6)
list(APPEND SRCS net_ipv6_maskcmp.c net_ipv6_pref2mask.c)
list(APPEND SRCS net_ipv6_maskcmp.c net_ipv6_pref2mask.c net_ipv6_payload.c)
endif()
# TCP utilities

2
net/utils/Make.defs
View file

@ -27,7 +27,7 @@ NET_CSRCS += net_cmsg.c net_iob_concat.c net_getrandom.c net_mask2pref.c
# IPv6 utilities
ifeq ($(CONFIG_NET_IPv6),y)
NET_CSRCS += net_ipv6_maskcmp.c net_ipv6_pref2mask.c
NET_CSRCS += net_ipv6_maskcmp.c net_ipv6_pref2mask.c net_ipv6_payload.c
endif
# TCP utilities

74
net/utils/net_ipv6_payload.c Normal file
View file

@ -0,0 +1,74 @@
/****************************************************************************
* 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 */

20
net/utils/utils.h
View file

@ -254,6 +254,26 @@ uint8_t net_ipv6_mask2pref(FAR const uint16_t *mask);
void net_ipv6_pref2mask(net_ipv6addr_t mask, uint8_t preflen);
#endif
/****************************************************************************
* 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.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
FAR void *net_ipv6_payload(FAR struct ipv6_hdr_s *ipv6, FAR uint8_t *proto);
#endif
/****************************************************************************
* Name: net_iob_concat
*