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nuttx/net/icmpv6/icmpv6_radvertise.c

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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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