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- /****************************************************************************
- * net/icmpv6/icmpv6_advertise.c
- * Send an ICMPv6 Neighbor Advertisement
- *
- * Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Adapted for NuttX from logic in uIP which also has a BSD-like license:
- *
- * Original author Adam Dunkels <adam@dunkels.com>
- * Copyright () 2001-2003, Adam Dunkels.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <stdint.h>
- #include <string.h>
- #include <debug.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/netstats.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/net.h>
- #include <nuttx/net/icmpv6.h>
- #include "netdev/netdev.h"
- #include "utils/utils.h"
- #include "icmpv6/icmpv6.h"
- #ifdef CONFIG_NET_ICMPv6
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define IPv6BUF ((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
- #define ICMPv6ADVERTISE \
- ((struct icmpv6_neighbor_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmpv6_advertise
- *
- * Description:
- * Send an ICMPv6 Neighbor Advertisement
- *
- * Input Parameters:
- * dev - The device driver structure containing the outgoing ICMPv6 packet
- * buffer
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked
- *
- ****************************************************************************/
- void icmpv6_advertise(FAR struct net_driver_s *dev,
- const net_ipv6addr_t destipaddr)
- {
- FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
- FAR struct icmpv6_neighbor_advertise_s *adv;
- uint16_t lladdrsize;
- uint16_t l3size;
- /* Set up the IPv6 header */
- ipv6->vtc = 0x60; /* Version/traffic class (MS) */
- ipv6->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
- ipv6->flow = 0; /* Flow label (LS) */
- /* Length excludes the IPv6 header */
- lladdrsize = netdev_lladdrsize(dev);
- l3size = SIZEOF_ICMPV6_NEIGHBOR_ADVERTISE_S(lladdrsize);
- ipv6->len[0] = (l3size >> 8);
- ipv6->len[1] = (l3size & 0xff);
- ipv6->proto = IP_PROTO_ICMP6; /* Next header */
- ipv6->ttl = 255; /* Hop limit */
- /* Swap source for destination IP address, add our source IP address */
- net_ipv6addr_copy(ipv6->destipaddr, destipaddr);
- net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
- /* Set up the ICMPv6 Neighbor Advertise response */
- adv = ICMPv6ADVERTISE;
- adv->type = ICMPv6_NEIGHBOR_ADVERTISE; /* Message type */
- adv->code = 0; /* Message qualifier */
- adv->flags[0] = ICMPv6_NADV_FLAG_S | ICMPv6_NADV_FLAG_O; /* Solicited+Override flags. */
- adv->flags[1] = 0;
- adv->flags[2] = 0;
- adv->flags[3] = 0;
- /* Copy the target address into the Neighbor Advertisement message */
- net_ipv6addr_copy(adv->tgtaddr, dev->d_ipv6addr);
- /* Set up the options */
- adv->opttype = ICMPv6_OPT_TGTLLADDR; /* Option type */
- adv->optlen = ICMPv6_OPT_OCTECTS(lladdrsize); /* Option length in octets */
- /* Copy our link layer address into the message */
- memcpy(adv->tgtlladdr, &dev->d_mac, lladdrsize);
- /* Calculate the checksum over both the ICMP header and payload */
- adv->chksum = 0;
- adv->chksum = ~icmpv6_chksum(dev, IPv6_HDRLEN);
- /* Set the size to the size of the IPv6 header and the payload size */
- dev->d_len = IPv6_HDRLEN + l3size;
- ninfo("Outgoing ICMPv6 Neighbor Advertise length: %d (%d)\n",
- dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
- #ifdef CONFIG_NET_STATISTICS
- g_netstats.icmpv6.sent++;
- g_netstats.ipv6.sent++;
- #endif
- }
- #endif /* CONFIG_NET_ICMPv6 */
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