162 lines
5.3 KiB
C
162 lines
5.3 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_solicit.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 <stdint.h>
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#include <string.h>
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#include <debug.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/netstats.h>
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#include "devif/devif.h"
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#include "netdev/netdev.h"
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#include "utils/utils.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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#define ICMPv6SOLICIT \
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((FAR struct icmpv6_neighbor_solicit_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* First 6 hwords of the multi-cast address in network byte order */
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static const uint16_t g_icmpv_mcastaddr[6] =
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{
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HTONS(0xff02), HTONS(0x0000), HTONS(0x0000), HTONS(0x0000),
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HTONS(0x0000), HTONS(0x0001)
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_solicit
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*
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* Description:
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* Set up to send an ICMPv6 Neighbor Solicitation message. This version
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* is for a standalone solicitation. If formats:
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*
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* - The IPv6 header
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* - The ICMPv6 Neighbor Solicitation Message
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*
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* Input Parameters:
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* dev - Reference to a device driver structure
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* ipaddr - IP address of Neighbor to be solicited
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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_solicit(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t ipaddr)
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{
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FAR struct ipv6_hdr_s *ipv6;
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FAR struct icmpv6_neighbor_solicit_s *sol;
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uint16_t lladdrsize;
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uint16_t l3size;
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/* Set up the IPv6 header (most is probably already in place) */
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ipv6 = IPv6BUF;
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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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/* Length excludes the IPv6 header */
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lladdrsize = netdev_lladdrsize(dev);
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l3size = SIZEOF_ICMPV6_NEIGHBOR_SOLICIT_S(lladdrsize);
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ipv6->len[0] = (l3size >> 8);
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ipv6->len[1] = (l3size & 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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/* Set the multicast destination IP address */
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memcpy(ipv6->destipaddr, g_icmpv_mcastaddr, 6*sizeof(uint16_t));
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ipv6->destipaddr[6] = ipaddr[6] | HTONS(0xff00);
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ipv6->destipaddr[7] = ipaddr[7];
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/* Add out IPv6 address as the source address */
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net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
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/* Set up the ICMPv6 Neighbor Solicitation message */
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sol = ICMPv6SOLICIT;
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sol->type = ICMPv6_NEIGHBOR_SOLICIT; /* Message type */
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sol->code = 0; /* Message qualifier */
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sol->flags[0] = 0; /* flags */
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sol->flags[1] = 0;
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sol->flags[2] = 0;
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sol->flags[3] = 0;
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/* Copy the target address into the Neighbor Solicitation message */
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net_ipv6addr_copy(sol->tgtaddr, ipaddr);
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/* Set up the options */
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sol->opttype = ICMPv6_OPT_SRCLLADDR; /* Option type */
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sol->optlen = ICMPv6_OPT_OCTECTS(lladdrsize); /* Option length in octets */
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/* Copy our link layer address into the message */
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memcpy(sol->srclladdr, &dev->d_mac, lladdrsize);
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/* Calculate the checksum over both the ICMP header and payload */
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sol->chksum = 0;
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sol->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
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/* Set the size to the size of the IPv6 header and the payload size */
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dev->d_len = IPv6_HDRLEN + l3size;
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ninfo("Outgoing ICMPv6 Neighbor Solicitation length: %d (%d)\n",
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dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.sent++;
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g_netstats.ipv6.sent++;
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#endif
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}
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#endif /* CONFIG_NET_ICMPv6 */
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