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