d0f72617ef
From: Sakari Kapanen <sakari.kapanen@optofidelity.com> Date: Sun, 24 Sep 2017 13:19:25 +0300 Subject: [PATCH] ICMPv6: fix router advertisement Fixes several errors preventing icmpv6_radvertise.c from being compiled. Fixes conversions to network byte order (namely vlifetime, plifetime, mtu). IPv6 source address is set to link-local IP address instead of the address in the netdev structure. This is in compliance to RFC 4861. RA didn't work on Linux before this change. Finally, router prefix and prefix length are derived from the IPv6 address and netmask in the netdev structure. This seems to make more sense than using a predefined, separate prefix from the config.
274 lines
9.2 KiB
C
274 lines
9.2 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_radvertise.c
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* Send an ICMPv6 Router Advertisement
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*
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* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/netconfig.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/icmpv6.h>
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#include "netdev/netdev.h"
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#include "inet/inet.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_ROUTER
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ETHBUF ((struct eth_hdr_s *)&dev->d_buf[0])
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#define IPv6BUF ((struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define ICMPv6ADVERTISE \
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((struct icmpv6_router_advertise_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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static const net_ipv6addr_t g_ipv6_prefix =
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{
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HTONS(CONFIG_NET_ICMPv6_PREFIX_1),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_2),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_3),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_4),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_5),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_6),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_7),
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HTONS(CONFIG_NET_ICMPv6_PREFIX_8)
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ipv6addr_mask
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*
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* Description:
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* Copy an IPv6 address under a mask
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*
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* Input Parameters:
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* dest - Location to return the masked address
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* src - The IPv6 address to mask
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* maksk - The address mask
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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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static inline void ipv6addr_mask(FAR uint16_t *dest, FAR const uint16_t *src,
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FAR const uint16_t *mask)
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{
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int i;
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for (i = 0; i < 8; ++i)
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{
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dest[i] = src[i] & mask[i];
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}
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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_radvertise
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*
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* Description:
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* Send an ICMPv6 Router Advertisement
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*
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* Input Parameters:
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* dev - The device driver structure containing the outgoing ICMPv6 packet
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* buffer
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked
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*
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****************************************************************************/
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void icmpv6_radvertise(FAR struct net_driver_s *dev)
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{
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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR struct icmpv6_router_advertise_s *adv;
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FAR struct icmpv6_srclladdr_s *srcaddr;
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FAR struct icmpv6_mtu_s *mtu;
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FAR struct icmpv6_prefixinfo_s *prefix;
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uint16_t lladdrsize;
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uint16_t l3size;
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/* Set up the IPv6 header */
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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_dev_lladdrsize(dev);
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l3size = sizeof(struct icmpv6_router_advertise_s) +
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SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize) +
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sizeof(struct icmpv6_mtu_s) +
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sizeof(struct icmpv6_prefixinfo_s);
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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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/* Swap source for destination IP address, add our source IP address */
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net_ipv6addr_copy(ipv6->destipaddr, g_ipv6_allnodes);
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/* Source IP address must be set to link-local IP */
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ipv6->srcipaddr[0] = HTONS(0xfe80);
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memset(&ipv6->srcipaddr[1], 0, 4 * sizeof(uint16_t));
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memcpy(&ipv6->srcipaddr[5], &dev->d_mac.ether.ether_addr_octet, sizeof(struct ether_addr));
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/* Set up the ICMPv6 Router Advertise response */
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adv = ICMPv6ADVERTISE;
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adv->type = ICMPV6_ROUTER_ADVERTISE; /* Message type */
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adv->code = 0; /* Message qualifier */
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adv->hoplimit = 64; /* Current hop limit */
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adv->flags = ICMPv6_RADV_FLAG_M; /* Managed address flag. */
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adv->lifetime = HTONS(1800); /* Router lifetime */
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adv->reachable = 0; /* Reachable time */
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adv->retrans = 0; /* Retransmission timer */
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/* Set up the source address option */
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srcaddr = (FAR struct icmpv6_srclladdr_s *)
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((FAR uint8_t *)adv + sizeof(struct icmpv6_router_advertise_s));
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srcaddr->opttype = ICMPv6_OPT_SRCLLADDR;
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srcaddr->optlen = ICMPv6_OPT_OCTECTS(lladdrsize);
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memcpy(srcaddr->srclladdr, &dev->d_mac, lladdrsize);
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/* Set up the MTU option */
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mtu = (FAR struct icmpv6_mtu_s *)
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((FAR uint8_t *)srcaddr + SIZEOF_ICMPV6_SRCLLADDR_S(lladdrsize));
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mtu->opttype = ICMPv6_OPT_MTU;
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mtu->optlen = 1;
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mtu->reserved = 0;
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mtu->mtu = HTONL(CONFIG_NET_ETH_MTU);
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/* Set up the prefix option */
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prefix = (FAR struct icmpv6_prefixinfo_s *)
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((FAR uint8_t *)mtu + sizeof(struct icmpv6_mtu_s));
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prefix->opttype = ICMPv6_OPT_PREFIX;
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prefix->optlen = 4;
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prefix->flags = ICMPv6_PRFX_FLAG_L | ICMPv6_PRFX_FLAG_A;
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prefix->vlifetime = HTONL(2592000);
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prefix->plifetime = HTONL(604800);
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prefix->reserved[0] = 0;
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prefix->reserved[1] = 0;
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/* Set the prefix and prefix length based on net driver IP and netmask */
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prefix->preflen = net_ipv6_mask2pref(dev->d_ipv6netmask);
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ipv6addr_mask(prefix->prefix, dev->d_ipv6addr, dev->d_ipv6netmask);
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/* Calculate the checksum over both the ICMP header and payload */
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adv->chksum = 0;
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adv->chksum = ~icmpv6_chksum(dev);
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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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#ifdef CONFIG_NET_ETHERNET
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/* Add the size of the Ethernet header */
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dev->d_len += ETH_HDRLEN;
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/* Move the source and to the destination addresses in the Ethernet header
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* and use our MAC as the new source address
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*/
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if (dev->d_lltype == NET_LL_ETHERNET)
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{
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FAR struct eth_hdr_s *eth = ETHBUF;
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memcpy(eth->dest, g_ipv6_ethallnodes.ether_addr_octet, ETHER_ADDR_LEN);
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memcpy(eth->src, dev->d_mac.ether.ether_addr_octet, ETHER_ADDR_LEN);
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/* Set the IPv6 Ethernet type */
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eth->type = HTONS(ETHTYPE_IP6);
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}
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#endif
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/* No additional neighbor lookup is required on this packet (We are using
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* a multicast address).
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*/
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IFF_SET_NOARP(dev->d_flags);
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ninfo("Outgoing ICMPv6 Router Advertise 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_ROUTER */
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