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- /****************************************************************************
- * net/icmpv6/icmpv6_radvertise.c
- * Send an ICMPv6 Router Advertisement
- *
- * Copyright (C) 2015, 2017, 2020 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 "netdev/netdev.h"
- #include "inet/inet.h"
- #include "utils/utils.h"
- #include "icmpv6/icmpv6.h"
- #ifdef CONFIG_NET_ICMPv6_ROUTER
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define IPv6BUF ((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
- #define ICMPv6ADVERTISE \
- ((struct icmpv6_router_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- #ifdef CONFIG_NET_ICMPv6_ROUTER_MANUAL
- 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)
- };
- #endif /* CONFIG_NET_ICMPv6_ROUTER_MANUAL */
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: ipv6addr_mask
- *
- * Description:
- * Copy an IPv6 address under a mask
- *
- * Input Parameters:
- * dest - Location to return the masked address
- * src - The IPv6 address to mask
- * maksk - The address mask
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- #ifndef CONFIG_NET_ICMPv6_ROUTER_MANUAL
- static inline void ipv6addr_mask(FAR uint16_t *dest, FAR const uint16_t *src,
- FAR const uint16_t *mask)
- {
- int i;
- for (i = 0; i < 8; ++i)
- {
- dest[i] = src[i] & mask[i];
- }
- }
- #endif /* !CONFIG_NET_ICMPv6_ROUTER_MANUAL */
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmpv6_radvertise
- *
- * Description:
- * Send an ICMPv6 Router Advertisement
- *
- * Input Parameters:
- * dev - The device driver structure containing the outgoing ICMPv6 packet
- * buffer
- *
- * Returned Value:
- * None
- *
- * Assumptions:
- * The network is locked
- *
- ****************************************************************************/
- void icmpv6_radvertise(FAR struct net_driver_s *dev)
- {
- FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
- FAR struct icmpv6_router_advertise_s *adv;
- FAR struct icmpv6_srclladdr_s *srcaddr;
- FAR struct icmpv6_mtu_s *mtu;
- FAR struct icmpv6_prefixinfo_s *prefix;
- 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(struct icmpv6_router_advertise_s) +
- SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize) +
- sizeof(struct icmpv6_mtu_s) +
- sizeof(struct icmpv6_prefixinfo_s);
- 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, g_ipv6_allnodes);
- /* Source IP address must be set to link-local IP */
- icmpv6_linkipaddr(dev, ipv6->srcipaddr);
- /* 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; /* Reachable time */
- adv->retrans = 0; /* Retransmission timer */
- /* Set up the source address option */
- srcaddr = (FAR struct icmpv6_srclladdr_s *)
- ((FAR uint8_t *)adv +
- sizeof(struct icmpv6_router_advertise_s));
- srcaddr->opttype = ICMPv6_OPT_SRCLLADDR;
- srcaddr->optlen = ICMPv6_OPT_OCTECTS(lladdrsize);
- memcpy(srcaddr->srclladdr, &dev->d_mac, lladdrsize);
- /* Set up the MTU option */
- mtu = (FAR struct icmpv6_mtu_s *)
- ((FAR uint8_t *)srcaddr +
- SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize));
- mtu->opttype = ICMPv6_OPT_MTU;
- mtu->optlen = 1;
- mtu->reserved = 0;
- mtu->mtu = HTONL(dev->d_pktsize - dev->d_llhdrlen);
- /* Set up the prefix option */
- prefix = (FAR struct icmpv6_prefixinfo_s *)
- ((FAR uint8_t *)mtu + sizeof(struct icmpv6_mtu_s));
- prefix->opttype = ICMPv6_OPT_PREFIX;
- prefix->optlen = 4;
- prefix->flags = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
- prefix->vlifetime = HTONL(2592000);
- prefix->plifetime = HTONL(604800);
- prefix->reserved[0] = 0;
- prefix->reserved[1] = 0;
- #ifdef CONFIG_NET_ICMPv6_ROUTER_MANUAL
- /* Copy the configured prefex */
- prefix->preflen = CONFIG_NET_ICMPv6_PREFLEN;
- net_ipv6addr_copy(prefix->prefix, g_ipv6_prefix);
- #else
- /* Set the prefix and prefix length based on net driver IP and netmask */
- prefix->preflen = net_ipv6_mask2pref(dev->d_ipv6netmask);
- ipv6addr_mask(prefix->prefix, dev->d_ipv6addr, dev->d_ipv6netmask);
- #endif /* CONFIG_NET_ICMPv6_ROUTER_MANUAL */
- /* 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 Router 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_ROUTER */
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