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net/icmpv6/icmpv6_radvertise.c

+/****************************************************************************
+ * net/icmpv6/icmpv6_radvertise.c
+ * Send an ICMPv6 Router Advertisement
+ *
+ *   Copyright (C) 2015 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/icmpv6.h>
+
+#include "utils/utils.h"
+#include "icmpv6/icmpv6.h"
+
+#ifdef CONFIG_NET_ICMPv6_ROUTER
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+/* This is the same as struct icmpv6_router_advertise_s, but with the
+ * source address and prefix options included for simplicity.
+ */
+
+struct icmpv6_radvertise_s
+{
+  uint8_t  type;             /* Message Type: ICMPV6_ROUTER_ADVERTISE */
+  uint8_t  code;             /* Further qualifies the ICMP messages */
+  uint16_t chksum;           /* Checksum of ICMP header and data */
+  uint8_t  hoplimit;         /* Current hop limit */
+  uint8_t  flags;            /* See ICMPv6_RADV_FLAG_* definitions */
+  uint16_t lifetime;         /* Router lifetime */
+  uint16_t reachable[2];     /* Reachable time */
+  uint16_t retrans[2];       /* Retransmission timer */
+
+  /* Options */
+
+  struct icmpv6_srclladdr_s srcaddr;
+  struct icmpv6_mtu_s mtu;
+  struct icmpv6_prefixinfo_s prefix;
+};
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ETHBUF    ((struct eth_hdr_s *)&dev->d_buf[0])
+#define ICMPv6BUF ((struct icmpv6_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
+
+#define ICMPv6ADVERTISE \
+  ((struct icmpv6_radvertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const net_ipv6addr_t g_ipv6_prefix =
+{
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_1),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_2),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_3),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_4),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_5),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_6),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_7),
+  HTONS(CONFIG_NET_ICMPv6_PREFIX_8)
+};
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: icmpv6_radvertise
+ *
+ * Description:
+ *   Send an ICMPv6 Router Advertisement
+ *
+ * Parameters:
+ *   dev - The device driver structure containing the outgoing ICMPv6 packet
+ *         buffer
+ *
+ * Return:
+ *   None
+ *
+ * Assumptions:
+ *   The network is locked
+ *
+ ****************************************************************************/
+
+void icmpv6_radvertise(FAR struct net_driver_s *dev)
+{
+  FAR struct icmpv6_iphdr_s *icmp = ICMPv6BUF;
+  FAR struct icmpv6_radvertise_s *adv;
+  FAR struct icmpv6_srclladdr_s *srcaddr;
+  FAR struct icmpv6_mtu_s *mtu;
+  FAR struct icmpv6_prefixinfo_s *prefix;
+
+  /* Set up the IPv6 header */
+
+  icmp->vtc    = 0x60;                         /* Version/traffic class (MS) */
+  icmp->tcf    = 0;                            /* Traffic class (LS)/Flow label (MS) */
+  icmp->flow   = 0;                            /* Flow label (LS) */
+
+  /* Length excludes the IPv6 header */
+
+  icmp->len[0] = (sizeof(struct icmpv6_radvertise_s) >> 8);
+  icmp->len[1] = (sizeof(struct icmpv6_radvertise_s) & 0xff);
+
+  icmp->proto  = IP_PROTO_ICMP6;               /* Next header */
+  icmp->ttl    = 255;                          /* Hop limit */
+
+  /* Swap source for destination IP address, add our source IP address */
+
+  net_ipv6addr_copy(icmp->destipaddr, g_ipv6_allnodes);
+  net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
+
+  /* Set up the ICMPv6 Router Advertise response */
+
+  adv               = ICMPv6ADVERTISE;
+  adv->type         = ICMPV6_ROUTER_ADVERTISE; /* Message type */
+  adv->code         = 0;                       /* Message qualifier */
+  adv->hoplimit     = 64;                      /* Current hop limit */
+  adv->flags        = ICMPv6_RADV_FLAG_M;      /* Managed address flag. */
+  adv->lifetime     = HTONS(1800);             /* Router lifetime */
+  adv->reachable[0] = 0;                       /* Reachable time */
+  adv->reachable[1] = 0;
+  adv->retrans[0]   = 0;                       /* Retransmission timer */
+  adv->retrans[1]   = 0;
+
+  /* Set up the source address option */
+
+  srcaddr           = &adv->srcaddr;
+  srcaddr->opttype  = ICMPv6_OPT_SRCLLADDR;
+  srcaddr->optlen   = 1;
+  memcpy(srcaddr->srclladdr, &dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
+
+  /* Set up the MTU option */
+
+  mtu               = &adv->mtu;
+  mtu->opttype      = ICMPv6_OPT_MTU;
+  mtu->optlen       = 1;
+  mtu->reserved     = 0;
+  mtu->mtu[0]       = HTONS(CONFIG_NET_ETH_MTU >> 8);
+  mtu->mtu[1]       = HTONS(CONFIG_NET_ETH_MTU & 0xff);
+
+  /* Set up the prefix option */
+
+  prefix            = &adv->prefix;
+  prefix->opttype   = ICMPv6_OPT_MTU;
+  prefix->optlen    = 4;
+  prefix->preflen   = CONFIG_NET_ICMPv6_PREFLEN;
+  prefix->flags     = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
+
+  prefix->vlifetime[0] = HTONS(2592000 >> 8);
+  prefix->vlifetime[1] = HTONS(2592000 & 0xff);
+  prefix->plifetime[0] = HTONS(604800 >> 8);
+  prefix->plifetime[1] = HTONS(604800 & 0xff);
+  prefix->reserved[0]  = 0;
+  prefix->reserved[1]  = 0;
+  net_ipv6addr_copy(prefix->prefix, g_ipv6_prefix);
+
+  /* Calculate the checksum over both the ICMP header and payload */
+
+  icmp->chksum = 0;
+  icmp->chksum = ~icmpv6_chksum(dev);
+
+  /* Set the size to the size of the IPv6 header and the payload size */
+
+  dev->d_len   = IPv6_HDRLEN + sizeof(struct icmpv6_radvertise_s);
+
+#ifdef CONFIG_NET_ETHERNET
+  /* Add the size of the Ethernet header */
+
+  dev->d_len  += ETH_HDRLEN;
+
+  /* Move the source and to the destination addresses in the Ethernet header
+   * and use our MAC as the new source address
+   */
+
+#ifdef CONFIG_NET_MULTILINK
+  if (dev->d_lltype == NET_LL_ETHERNET)
+#endif
+    {
+      FAR struct eth_hdr_s *eth = ETHBUF;
+
+      memcpy(eth->dest, g_ipv6_ethallnodes.ether_addr_octet, ETHER_ADDR_LEN);
+      memcpy(eth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
+
+      /* Set the IPv6 Ethernet type */
+
+      eth->type  = HTONS(ETHTYPE_IP6);
+    }
+#endif
+
+  /* No additional neighbor lookup is required on this packet (We are using
+   * a multicast address).
+   */
+
+  IFF_SET_NOARP(dev->d_flags);
+
+  nllvdbg("Outgoing ICMPv6 Router Advertise length: %d (%d)\n",
+          dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
+
+#ifdef CONFIG_NET_STATISTICS
+  g_netstats.icmpv6.sent++;
+  g_netstats.ipv6.sent++;
+#endif
+}
+
+#endif /* CONFIG_NET_ICMPv6_ROUTER */