2021-11-25 15:03:33 +01:00
|
|
|
/****************************************************************************
|
|
|
|
* net/icmpv6/icmpv6_reply.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 <sys/types.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <debug.h>
|
|
|
|
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <net/if.h>
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
|
|
|
|
#include <nuttx/net/net.h>
|
|
|
|
#include <nuttx/net/netdev.h>
|
|
|
|
#include <nuttx/net/ip.h>
|
|
|
|
#include <nuttx/net/icmpv6.h>
|
|
|
|
|
|
|
|
#include "utils/utils.h"
|
|
|
|
#include "netdev/netdev.h"
|
|
|
|
#include "devif/devif.h"
|
|
|
|
#include "inet/inet.h"
|
|
|
|
#include "icmpv6/icmpv6.h"
|
|
|
|
|
|
|
|
#ifdef CONFIG_NET_ICMPv6
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Pre-processor Definitions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/* The latest drafts declared increase in minimal mtu up to 1280. */
|
|
|
|
|
|
|
|
#define ICMPv6_MINMTULEN 1280
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Public Functions
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
|
|
* Name: icmp_reply
|
|
|
|
*
|
|
|
|
* Description:
|
|
|
|
* Send an ICMPv6 message in response to a situation
|
|
|
|
* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header.
|
|
|
|
* MAY send more (we do).
|
|
|
|
* MUST NOT change this header information.
|
|
|
|
* MUST NOT reply to a multicast/broadcast IP address.
|
|
|
|
* MUST NOT reply to a multicast/broadcast MAC address.
|
|
|
|
* MUST reply to only the first fragment.
|
|
|
|
*
|
|
|
|
* Input Parameters:
|
|
|
|
* dev - The device driver structure containing the received packet
|
|
|
|
* type - ICMPv6 Message Type, eg. ICMPv6_DEST_UNREACHABLE
|
|
|
|
* code - ICMPv6 Message Code, eg. ICMPv6_PORT_UNREACH
|
|
|
|
* data - Additional 32-bit parameter in the ICMPv6 header
|
|
|
|
*
|
|
|
|
* Returned Value:
|
|
|
|
* None
|
|
|
|
*
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
void icmpv6_reply(FAR struct net_driver_s *dev, int type, int code, int data)
|
|
|
|
{
|
|
|
|
int ipicmplen = IPv6_HDRLEN + sizeof(struct icmpv6_hdr_s);
|
|
|
|
FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
|
2022-01-17 23:09:14 +01:00
|
|
|
FAR struct icmpv6_hdr_s *icmpv6 = (FAR struct icmpv6_hdr_s *)(ipv6 + 1);
|
2021-11-25 15:03:33 +01:00
|
|
|
uint16_t datalen;
|
|
|
|
|
|
|
|
if (net_ipv6addr_cmp(ipv6->destipaddr, g_ipv6_unspecaddr)
|
|
|
|
# ifdef CONFIG_NET_BROADCAST
|
|
|
|
|| net_is_addr_mcast(ipv6->destipaddr)
|
|
|
|
# endif /* CONFIG_NET_BROADCAST */
|
|
|
|
)
|
|
|
|
{
|
|
|
|
dev->d_len = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Get the data size of the packet. */
|
|
|
|
|
|
|
|
datalen = (ipv6->len[0] << 8) + ipv6->len[1];
|
|
|
|
|
|
|
|
/* RFC says return as much as we can without exceeding 1280 bytes. */
|
|
|
|
|
|
|
|
if (datalen > ICMPv6_MINMTULEN - ipicmplen)
|
|
|
|
{
|
|
|
|
datalen = ICMPv6_MINMTULEN - ipicmplen;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev->d_len = ipicmplen + datalen;
|
|
|
|
|
|
|
|
/* Copy fields from original packet */
|
|
|
|
|
|
|
|
memmove(icmpv6 + 1, ipv6, datalen);
|
|
|
|
|
|
|
|
/* Set up the IPv6 header (most is probably already in place) */
|
|
|
|
|
|
|
|
ipv6->vtc = 0x60; /* Version/traffic class (MS) */
|
|
|
|
ipv6->tcf = 0; /* Traffic class(LS)/Flow label(MS) */
|
|
|
|
ipv6->flow = 0; /* Flow label (LS) */
|
|
|
|
ipv6->len[0] = (dev->d_len >> 8); /* Length excludes the IPv6 header */
|
|
|
|
ipv6->len[1] = (dev->d_len & 0xff);
|
|
|
|
ipv6->proto = IP_PROTO_ICMP6; /* Next header */
|
|
|
|
ipv6->ttl = 255; /* Hop limit */
|
|
|
|
|
|
|
|
net_ipv6addr_hdrcopy(ipv6->destipaddr, ipv6->srcipaddr);
|
|
|
|
net_ipv6addr_hdrcopy(ipv6->srcipaddr, dev->d_ipv6addr);
|
|
|
|
|
|
|
|
/* Initialize the ICMPv6 header */
|
|
|
|
|
2021-12-28 07:32:42 +01:00
|
|
|
icmpv6->type = type;
|
|
|
|
icmpv6->code = code;
|
|
|
|
icmpv6->data[0] = data >> 16;
|
|
|
|
icmpv6->data[1] = data & 0xffff;
|
2021-11-25 15:03:33 +01:00
|
|
|
|
|
|
|
/* Calculate the ICMPv6 checksum over the ICMPv6 header and payload. */
|
|
|
|
|
|
|
|
icmpv6->chksum = 0;
|
2022-11-24 09:50:11 +01:00
|
|
|
icmpv6->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
|
2021-11-25 15:03:33 +01:00
|
|
|
if (icmpv6->chksum == 0)
|
|
|
|
{
|
|
|
|
icmpv6->chksum = 0xffff;
|
|
|
|
}
|
|
|
|
|
|
|
|
ninfo("Outgoing ICMPv6 packet length: %d (%d)\n",
|
|
|
|
dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_NET_ICMPv6 */
|