918 lines
33 KiB
C
918 lines
33 KiB
C
/**
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* \addtogroup uip6
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* @{
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*/
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/**
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* \file
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* Neighbor discovery Input-Output (RFC 4861)
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* \author Julien Abeille <jabeille@cisco.com>
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* \author Mathilde Durvy <mdurvy@cisco.com>
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*/
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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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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* 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. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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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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* 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. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <string.h>
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#include "net/uip-icmp6.h"
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#include "net/uip-nd6.h"
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#include "net/uip-netif.h"
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/*------------------------------------------------------------------*/
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
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#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",lladdr->addr[0], lladdr->addr[1], lladdr->addr[2], lladdr->addr[3],lladdr->addr[4], lladdr->addr[5])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(lladdr)
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#endif
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#if UIP_LOGGING
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#include <stdio.h>
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void uip_log(char *msg);
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#define UIP_LOG(m) uip_log(m)
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#else
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#define UIP_LOG(m)
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#endif /* UIP_LOGGING == 1 */
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/*------------------------------------------------------------------*/
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/** @{ */
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/** \name Pointers to the header structures.
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* All pointers except UIP_IP_BUF depend on uip_ext_len, which at
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* packet reception, is the total length of the extension headers.
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*
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* The pointer to ND6 options header also depends on nd6_opt_offset,
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* which we set in each function.
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*
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* Care should be taken when manipulating these buffers about the
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* value of these length variables
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*/
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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/**< Pointer to IP header */
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#define UIP_ICMP_BUF ((struct uip_icmp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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/**< Pointer to ICMP header*/
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/**@{ Pointers to messages just after icmp header */
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#define UIP_ND6_RS_BUF ((struct uip_nd6_rs *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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#define UIP_ND6_RA_BUF ((struct uip_nd6_ra *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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#define UIP_ND6_NS_BUF ((struct uip_nd6_ns *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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#define UIP_ND6_NA_BUF ((struct uip_nd6_na *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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#define UIP_ICMP6_ERROR_BUF ((struct uip_icmp6_error *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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/** @} */
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/** Pointer to ND option */
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#define UIP_ND6_OPT_HDR_BUF ((struct uip_nd6_opt_hdr *)&uip_buf[uip_l2_l3_icmp_hdr_len + nd6_opt_offset])
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/** @} */
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/** \brief Offset from the end of the icmpv6 header to the option in uip_buf*/
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static u8_t nd6_opt_offset;
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/** \brief Pointer to llao option in uip_buf */
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static struct uip_nd6_opt_llao *nd6_opt_llao;
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/** \brief Pointer to mtu option in uip_buf */
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static struct uip_nd6_opt_mtu *nd6_opt_mtu;
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/** \brief Pointer to prefix information option in uip_buf */
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static struct uip_nd6_opt_prefix_info *nd6_opt_prefix_info[UIP_CONF_ND6_MAX_PREFIXES];
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/** \brief Pointer to a neighbor cache entry*/
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static struct uip_nd6_neighbor *neighbor;
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/** \brief Pointer to a prefix list entry */
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static struct uip_nd6_prefix *prefix;
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/** \brief Pointer to a router list entry */
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static struct uip_nd6_defrouter *router;
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/** \brief Pointer to an interface address */
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static struct uip_netif_addr *ifaddr;
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/** \brief Index used in loops */
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static u8_t i;
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/*------------------------------------------------------------------*/
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void
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uip_nd6_io_ns_input(void)
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{
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u8_t flags;
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PRINTF("Received NS from");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF("to");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("with target address");
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PRINT6ADDR((uip_ipaddr_t *)(&UIP_ND6_NS_BUF->tgtipaddr));
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PRINTF("\n");
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UIP_STAT(++uip_stat.nd6.recv);
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#if UIP_CONF_IPV6_CHECKS
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if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) ||
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(uip_is_addr_mcast(&UIP_ND6_NS_BUF->tgtipaddr)) ||
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(UIP_ICMP_BUF->icode != 0)) {
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goto badpkt;
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}
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#endif /* UIP_CONF_IPV6_CHECKS */
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/* Options reading: we handle only SLLAO for now */
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nd6_opt_llao = NULL;
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nd6_opt_offset = UIP_ND6_NS_LEN;
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while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) {
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#if UIP_CONF_IPV6_CHECKS
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if(UIP_ND6_OPT_HDR_BUF->len == 0) {
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goto badpkt;
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}
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#endif /* UIP_CONF_IPV6_CHECKS */
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switch(UIP_ND6_OPT_HDR_BUF->type) {
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case UIP_ND6_OPT_SLLAO:
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nd6_opt_llao = (struct uip_nd6_opt_llao *)UIP_ND6_OPT_HDR_BUF;
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break;
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default:
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UIP_LOG("ND option not supported in NS");
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break;
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}
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nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3);
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}
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/* Options processing: only SLLAO */
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if(nd6_opt_llao != NULL) {
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#if UIP_CONF_IPV6_CHECKS
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/* There must be NO option in a DAD NS */
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if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)) {
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goto badpkt;
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} else {
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#endif /*UIP_CONF_IPV6_CHECKS*/
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neighbor = uip_nd6_nbrcache_lookup(&UIP_IP_BUF->srcipaddr);
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if(neighbor == NULL) {
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/* we need to add the neighbor*/
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uip_nd6_nbrcache_add(&UIP_IP_BUF->srcipaddr,
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&nd6_opt_llao->addr, 0, STALE);
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} else {
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/* If LL address changed, set neighbor state to stale */
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if(memcmp(&nd6_opt_llao->addr, &neighbor->lladdr, UIP_LLADDR_LEN) != 0) {
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memcpy(&neighbor->lladdr, &nd6_opt_llao->addr, UIP_LLADDR_LEN);
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neighbor->state = STALE;
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} else {
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/* If neighbor state is INCOMPLETE, set to STALE */
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if(neighbor->state == INCOMPLETE) {
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neighbor->state = STALE;
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}
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}
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}
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#if UIP_CONF_IPV6_CHECKS
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}
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#endif /*UIP_CONF_IPV6_CHECKS*/
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}
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/*
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* Rest of NS processing: Depends on the purpose of the NS: NUD or DAD or
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* Address Resolution
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*/
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/** \note we use ifaddr to remember the target address */
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ifaddr = uip_netif_addr_lookup(&UIP_ND6_NS_BUF->tgtipaddr, 128, 0);
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if(ifaddr != NULL) {
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if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)){
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/* DAD CASE */
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#if UIP_CONF_IPV6_CHECKS
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/* Dst address must be solicited node mcast address */
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if(!uip_netif_is_addr_my_solicited(&UIP_IP_BUF->destipaddr)){
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goto badpkt;
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}
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#endif /* UIP_CONF_IPV6_CHECKS */
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/*
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* If my address is not tentative, then send a NA to all nodes with
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* TLLAO flags are: override = yes.
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*/
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if(ifaddr->state!=TENTATIVE) {
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/*
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* we need to send a NA, we set the src, dest, flags. tgt remains the
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* same and the rest is done at "create_na"
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*/
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uip_create_linklocal_allnodes_mcast(&UIP_IP_BUF->destipaddr);
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uip_netif_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
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flags = UIP_ND6_NA_FLAG_OVERRIDE;
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goto create_na;
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} else {
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/** \todo if I sent a NS before him, I win */
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uip_netif_dad_failed(&UIP_ND6_NS_BUF->tgtipaddr);
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goto discard;
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}
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}
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#if UIP_CONF_IPV6_CHECKS
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/* Duplicate check */
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if(uip_netif_is_addr_my_unicast(&UIP_IP_BUF->srcipaddr)) {
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/**
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* \NOTE do we do something here? we both are using the same address.
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* If we are doing dad, we could cancel it, though we should receive a
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* NA in response of DAD NS we sent, hence DAD will fail anyway. If we
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* were not doing DAD, it means there is a duplicate in the network!
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*/
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goto badpkt;
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}
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#endif /*UIP_CONF_IPV6_CHECKS*/
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/* Address resolution case */
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if(uip_netif_is_addr_my_solicited(&UIP_IP_BUF->destipaddr)){
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/*
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* we need to send a NA, we set the src, dest, flags. The rest is
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* set at the "create_na" label.
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*/
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uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
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uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &UIP_ND6_NS_BUF->tgtipaddr);
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flags = UIP_ND6_NA_FLAG_SOLICITED | UIP_ND6_NA_FLAG_OVERRIDE;
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goto create_na;
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}
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/*
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* NUD CASE. at this point the packet must be for us! we check this,
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* and at the same time if target == dest
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*/
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if(uip_netif_addr_lookup(&UIP_IP_BUF->destipaddr, 128, 0) == ifaddr){
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/*
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* we need to send a NA, we set the src, dest, flags. The rest is set
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* at the "create_na" label.
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*/
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uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
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uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &UIP_ND6_NS_BUF->tgtipaddr);
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flags = UIP_ND6_NA_FLAG_SOLICITED | UIP_ND6_NA_FLAG_OVERRIDE;
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goto create_na;
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} else {
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#if UIP_CONF_IPV6_CHECKS
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goto badpkt;
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#endif /* UIP_CONF_IPV6_CHECKS */
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}
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} else {
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goto discard;
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}
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create_na:
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/*
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* Fill the part of the NA which is common to all NAs. If the NS contained
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* extension headers, we must set the target address properly
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*/
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uip_ext_len = 0;
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/* IP header */
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UIP_IP_BUF->vtc = 0x60;
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UIP_IP_BUF->tcflow = 0;
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UIP_IP_BUF->flow = 0;
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UIP_IP_BUF->len[0] = 0; /* length will not be more than 255 */
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UIP_IP_BUF->len[1] = UIP_ICMPH_LEN + UIP_ND6_NA_LEN + UIP_ND6_OPT_LLAO_LEN;
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UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
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UIP_IP_BUF->ttl = UIP_ND6_HOP_LIMIT;
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/* ICMP header */
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UIP_ICMP_BUF->type = ICMP6_NA;
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UIP_ICMP_BUF->icode = 0;
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/* NA static part */
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UIP_ND6_NA_BUF->flagsreserved = flags;
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memcpy(&UIP_ND6_NA_BUF->tgtipaddr, &ifaddr->ipaddr, sizeof(uip_ipaddr_t));
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/* NA option: TLLAO. note that length field is in unit of 8 bytes */
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uip_len = UIP_IPH_LEN + UIP_ICMPH_LEN + UIP_ND6_NA_LEN + UIP_ND6_OPT_LLAO_LEN;
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nd6_opt_llao = (struct uip_nd6_opt_llao *)&uip_buf[uip_l2_l3_icmp_hdr_len + UIP_ND6_NA_LEN];
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nd6_opt_llao->type = UIP_ND6_OPT_TLLAO;
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nd6_opt_llao->len = UIP_ND6_OPT_LLAO_LEN >> 3;
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memcpy(&(nd6_opt_llao->addr), &uip_lladdr, UIP_LLADDR_LEN);
|
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/* padding if needed */
|
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memset((void *)(&nd6_opt_llao->addr) + UIP_LLADDR_LEN, 0, UIP_ND6_OPT_LLAO_LEN - 2 - UIP_LLADDR_LEN);
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|
|
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/*ICMP checksum*/
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UIP_ICMP_BUF->icmpchksum = 0;
|
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UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
|
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|
|
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UIP_STAT(++uip_stat.nd6.sent);
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PRINTF("Sending NA to");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("from");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF("with target address");
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PRINT6ADDR(&UIP_ND6_NA_BUF->tgtipaddr);
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PRINTF("\n");
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return;
|
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|
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#if UIP_CONF_IPV6_CHECKS
|
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badpkt:
|
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UIP_STAT(++uip_stat.nd6.drop);
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UIP_LOG("NS received is bad");
|
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#endif /* UIP_CONF_IPV6_CHECKS */
|
|
|
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discard:
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uip_len = 0;
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return;
|
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}
|
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/*------------------------------------------------------------------*/
|
|
void
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uip_nd6_io_ns_output(uip_ipaddr_t *src, uip_ipaddr_t *dest, uip_ipaddr_t *tgt)
|
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{
|
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/* IP header fields */
|
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uip_ext_len = 0;
|
|
UIP_IP_BUF->vtc = 0x60;
|
|
UIP_IP_BUF->tcflow = 0;
|
|
UIP_IP_BUF->flow = 0;
|
|
UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
|
|
UIP_IP_BUF->ttl = UIP_ND6_HOP_LIMIT;
|
|
|
|
/*
|
|
* The caller must put a valid tgt address.
|
|
* For dest, if the caller is doing DAD or Address resolution, he sets
|
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* dest to NULL and we forge dest as the sollicited node mcast address
|
|
* for tgt.
|
|
* If the caller is sending the NS for NUD, dest is unicast and the caller
|
|
* specifies it in the arguments
|
|
*/
|
|
if(dest == NULL) {
|
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uip_create_solicited_node(tgt, &UIP_IP_BUF->destipaddr);
|
|
} else {
|
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uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, dest);
|
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}
|
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UIP_ICMP_BUF->type = ICMP6_NS;
|
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UIP_ICMP_BUF->icode = 0;
|
|
UIP_ND6_NS_BUF->reserved = 0;
|
|
|
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/* Copy the tgt address */
|
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uip_ipaddr_copy((uip_ipaddr_t *)&UIP_ND6_NS_BUF->tgtipaddr, tgt);
|
|
|
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UIP_IP_BUF->len[0] = 0; /* length will not be more than 255 */
|
|
/*
|
|
* check if we add a SLLAO option: for DAD, MUST NOT, for NUD, MAY
|
|
* (here yes), for Address resolution , MUST
|
|
* i.e. if and only if tgt is our address (in this case it is DAD), we do
|
|
* not add it
|
|
*/
|
|
if(!(uip_netif_is_addr_my_unicast(tgt))) {
|
|
if(src != NULL) {
|
|
uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, src);
|
|
} else {
|
|
uip_netif_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
|
|
}
|
|
UIP_IP_BUF->len[1] = UIP_ICMPH_LEN + UIP_ND6_NS_LEN + UIP_ND6_OPT_LLAO_LEN;
|
|
|
|
uip_len = UIP_IPH_LEN + UIP_ICMPH_LEN + UIP_ND6_NS_LEN + UIP_ND6_OPT_LLAO_LEN;
|
|
nd6_opt_llao = (struct uip_nd6_opt_llao *)&uip_buf[uip_l2_l3_icmp_hdr_len + UIP_ND6_NS_LEN];
|
|
nd6_opt_llao->type = UIP_ND6_OPT_SLLAO; /* type of the option */
|
|
/*
|
|
* length of the option: 2 bytes for type, length, plus the length of
|
|
* the L2 address. It must be in units of 8 bytes
|
|
*/
|
|
nd6_opt_llao->len = UIP_ND6_OPT_LLAO_LEN >> 3;
|
|
memcpy(&nd6_opt_llao->addr, &uip_lladdr, UIP_LLADDR_LEN);
|
|
/* padding if needed */
|
|
memset((void *)(&nd6_opt_llao->addr) + UIP_LLADDR_LEN, 0, UIP_ND6_OPT_LLAO_LEN - 2 - UIP_LLADDR_LEN);
|
|
}
|
|
else {
|
|
uip_create_unspecified(&UIP_IP_BUF->srcipaddr);
|
|
UIP_IP_BUF->len[1] = UIP_ICMPH_LEN + UIP_ND6_NS_LEN;
|
|
uip_len = UIP_IPH_LEN + UIP_ICMPH_LEN + UIP_ND6_NS_LEN;
|
|
}
|
|
|
|
UIP_ICMP_BUF->icmpchksum = 0;
|
|
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
|
|
|
|
UIP_STAT(++uip_stat.nd6.sent);
|
|
PRINTF("Sending NS to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("with target address");
|
|
PRINT6ADDR(tgt);
|
|
PRINTF("\n");
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/*------------------------------------------------------------------*/
|
|
void
|
|
uip_nd6_io_na_input(void)
|
|
{
|
|
|
|
/*
|
|
* booleans. the three last one are not 0 or 1 but 0 or 0x80, 0x40, 0x20
|
|
* but it works. Be careful though, do not use tests such as is_router == 1
|
|
*/
|
|
u8_t is_llchange = 0;
|
|
u8_t is_router = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_ROUTER));
|
|
u8_t is_solicited = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_SOLICITED));
|
|
u8_t is_override = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_OVERRIDE));
|
|
|
|
PRINTF("Received NA from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("with target address");
|
|
PRINT6ADDR((uip_ipaddr_t *)(&UIP_ND6_NA_BUF->tgtipaddr));
|
|
PRINTF("\n");
|
|
UIP_STAT(++uip_stat.nd6.recv);
|
|
|
|
#if UIP_CONF_IPV6_CHECKS
|
|
/*
|
|
* Check hop limit / icmp code
|
|
* target address must not be multicast
|
|
* if the NA is solicited, dest must not be multicast
|
|
*/
|
|
if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) ||
|
|
(UIP_ICMP_BUF->icode != 0) ||
|
|
(uip_is_addr_mcast(&UIP_ND6_NA_BUF->tgtipaddr)) ||
|
|
(is_solicited && uip_is_addr_mcast(&UIP_IP_BUF->destipaddr))) {
|
|
goto badpkt;
|
|
}
|
|
#endif /*UIP_CONF_IPV6_CHECKS*/
|
|
|
|
/* Options reading: we can handle TLLAO, and must ignore othehrs */
|
|
nd6_opt_offset = UIP_ND6_NA_LEN;
|
|
nd6_opt_llao = NULL;
|
|
while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) {
|
|
#if UIP_CONF_IPV6_CHECKS
|
|
if(UIP_ND6_OPT_HDR_BUF->len == 0) {
|
|
goto badpkt;
|
|
}
|
|
#endif /*UIP_CONF_IPV6_CHECKS*/
|
|
switch(UIP_ND6_OPT_HDR_BUF->type) {
|
|
case UIP_ND6_OPT_TLLAO:
|
|
nd6_opt_llao = (struct uip_nd6_opt_llao *)UIP_ND6_OPT_HDR_BUF;
|
|
break;
|
|
default:
|
|
UIP_LOG("ND option not supported in NA");
|
|
break;
|
|
}
|
|
nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3);
|
|
}
|
|
ifaddr = uip_netif_addr_lookup(&UIP_ND6_NA_BUF->tgtipaddr, 128, 0);
|
|
/* Message processing, including TLLAO if any */
|
|
if(ifaddr != NULL) {
|
|
if(ifaddr->state == TENTATIVE) {
|
|
/*It means DAD failed*/
|
|
uip_netif_dad_failed(&UIP_ND6_NA_BUF->tgtipaddr);
|
|
}
|
|
goto discard;
|
|
} else {
|
|
neighbor = uip_nd6_nbrcache_lookup(&UIP_ND6_NA_BUF->tgtipaddr);
|
|
/* if the neighbor entry does not exist, silently discard */
|
|
if(neighbor == NULL) {
|
|
goto discard;
|
|
}
|
|
if(nd6_opt_llao != 0) {
|
|
is_llchange = memcmp((void *)&nd6_opt_llao->addr, (void *)(&neighbor->lladdr), UIP_LLADDR_LEN);
|
|
}
|
|
if(neighbor->state == INCOMPLETE){
|
|
if(nd6_opt_llao == 0) {
|
|
goto discard;
|
|
}
|
|
memcpy(&neighbor->lladdr, &nd6_opt_llao->addr, UIP_LLADDR_LEN);
|
|
if(is_solicited) {
|
|
neighbor->state = REACHABLE;
|
|
/* reachable time is stored in ms*/
|
|
stimer_set(&(neighbor->reachable),
|
|
uip_netif_physical_if.reachable_time / 1000);
|
|
|
|
} else {
|
|
neighbor->state = STALE;
|
|
}
|
|
neighbor->isrouter = is_router;
|
|
} else {
|
|
if(!is_override && is_llchange) {
|
|
if(neighbor->state == REACHABLE) {
|
|
neighbor->state = STALE;
|
|
}
|
|
goto discard;
|
|
} else {
|
|
if(is_override
|
|
|| (!is_override && nd6_opt_llao != 0 && !is_llchange)
|
|
|| nd6_opt_llao == 0) {
|
|
|
|
/* update LL address if any */
|
|
if(nd6_opt_llao != 0) {
|
|
memcpy(&neighbor->lladdr, &nd6_opt_llao->addr, UIP_LLADDR_LEN);
|
|
}
|
|
|
|
/*
|
|
* if the NA was solicited, change the state of the neighbor to
|
|
* reachabe. Otherwise and if the neighbor LL changed, set the
|
|
* state to STALE
|
|
*/
|
|
if(is_solicited) {
|
|
neighbor->state = REACHABLE;
|
|
/* reachable time is stored in ms*/
|
|
stimer_set(&(neighbor->reachable),
|
|
uip_netif_physical_if.reachable_time / 1000);
|
|
|
|
} else {
|
|
if(nd6_opt_llao != 0 && is_llchange) {
|
|
neighbor->state = STALE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if(neighbor->isrouter && !is_router){
|
|
/* the neighbor stopped being a router, we remove it from the list */
|
|
router = uip_nd6_defrouter_lookup(neighbor);
|
|
if(router != NULL){
|
|
uip_nd6_defrouter_rm(router);
|
|
}
|
|
}
|
|
neighbor->isrouter = is_router;
|
|
}
|
|
}
|
|
|
|
#if UIP_CONF_IPV6_QUEUE_PKT
|
|
/* The neighbor is now reachable, check if we had buffered a pkt for it */
|
|
if(neighbor->queue_buf_len != 0) {
|
|
uip_len = neighbor->queue_buf_len;
|
|
memcpy(UIP_IP_BUF, neighbor->queue_buf, uip_len);
|
|
neighbor->queue_buf_len = 0;
|
|
return;
|
|
}
|
|
#endif /*UIP_CONF_IPV6_QUEUE_PKT*/
|
|
uip_len = 0;
|
|
return;
|
|
|
|
#if UIP_CONF_IPV6_CHECKS
|
|
badpkt:
|
|
UIP_STAT(++uip_stat.nd6.drop);
|
|
UIP_LOG("NA received is bad");
|
|
#endif /* UIP_CONF_IPV6_CHECKS */
|
|
|
|
discard:
|
|
uip_len = 0;
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uip_nd6_io_rs_output(void) {
|
|
UIP_IP_BUF->vtc = 0x60;
|
|
UIP_IP_BUF->tcflow = 0;
|
|
UIP_IP_BUF->flow = 0;
|
|
UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
|
|
UIP_IP_BUF->ttl = UIP_ND6_HOP_LIMIT;
|
|
uip_create_linklocal_allrouters_mcast(&UIP_IP_BUF->destipaddr);
|
|
uip_netif_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
|
|
UIP_ICMP_BUF->type = ICMP6_RS;
|
|
UIP_ICMP_BUF->icode = 0;
|
|
UIP_ND6_RS_BUF->reserved = 0;
|
|
|
|
UIP_IP_BUF->len[0] = 0; /* length will not be more than 255 */
|
|
|
|
/* we add the SLLAO option only if src is not unspecified */
|
|
if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)) {
|
|
UIP_IP_BUF->len[1] = UIP_ICMPH_LEN + UIP_ND6_RS_LEN;
|
|
uip_len = uip_l3_icmp_hdr_len + UIP_ND6_RS_LEN;
|
|
} else {
|
|
uip_len = uip_l3_icmp_hdr_len + UIP_ND6_RS_LEN + UIP_ND6_OPT_LLAO_LEN;
|
|
UIP_IP_BUF->len[1] = UIP_ICMPH_LEN + UIP_ND6_RS_LEN + UIP_ND6_OPT_LLAO_LEN;
|
|
nd6_opt_llao = (struct uip_nd6_opt_llao *)&uip_buf[uip_l2_l3_icmp_hdr_len + UIP_ND6_RS_LEN];
|
|
nd6_opt_llao->type = UIP_ND6_OPT_SLLAO; /* type of the option */
|
|
nd6_opt_llao->len = UIP_ND6_OPT_LLAO_LEN >> 3;
|
|
/* length of the option in units of 8 bytes */
|
|
memcpy(&nd6_opt_llao->addr, &uip_lladdr, UIP_LLADDR_LEN);
|
|
/* padding if needed */
|
|
memset((void *)(&nd6_opt_llao->addr) + UIP_LLADDR_LEN, 0, UIP_ND6_OPT_LLAO_LEN - 2 - UIP_LLADDR_LEN);
|
|
}
|
|
|
|
|
|
UIP_ICMP_BUF->icmpchksum = 0;
|
|
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
|
|
|
|
UIP_STAT(++uip_stat.nd6.sent);
|
|
|
|
PRINTF("Sendin RS to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("\n");
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uip_nd6_io_ra_input(void) {
|
|
PRINTF("Received RA from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("\n");
|
|
UIP_STAT(++uip_stat.nd6.recv);
|
|
|
|
|
|
#if UIP_CONF_IPV6_CHECKS
|
|
/* a few validity checks */
|
|
if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) ||
|
|
(!uip_is_addr_link_local(&UIP_IP_BUF->srcipaddr)) ||
|
|
(UIP_ICMP_BUF->icode != 0)) {
|
|
goto badpkt;
|
|
}
|
|
#endif /*UIP_CONF_IPV6_CHECKS*/
|
|
|
|
/*
|
|
* process the fields of the constant part
|
|
* As per RFC 4861, for reachable time and retrans timer, a value of 0 means
|
|
* unspecified by this router.
|
|
* If router lifetime is 0, the router SHOULD NOT be placed in default
|
|
* router list
|
|
*/
|
|
if(UIP_ND6_RA_BUF->cur_ttl != 0) {
|
|
uip_netif_physical_if.cur_hop_limit = UIP_ND6_RA_BUF->cur_ttl;
|
|
PRINTF("uip_netif_physical_if.cur_hop_limit %u\n", uip_netif_physical_if.cur_hop_limit);
|
|
}
|
|
/*
|
|
* As per RFC4861 section 6.3.4, if reachable time field is non zero
|
|
* and defers from the current base reachable time for the interface,
|
|
* set base reachable time to the new value and recompute the reachable time
|
|
* as a random value distributed between 0.5 and 1.5 x Base reachable time
|
|
*/
|
|
if(UIP_ND6_RA_BUF->reachable_time != 0) {
|
|
if(uip_netif_physical_if.base_reachable_time != ntohl(UIP_ND6_RA_BUF->reachable_time)) {
|
|
uip_netif_physical_if.base_reachable_time = ntohl(UIP_ND6_RA_BUF->reachable_time);
|
|
uip_netif_physical_if.reachable_time = uip_netif_compute_reachable_time();
|
|
}
|
|
}
|
|
if(UIP_ND6_RA_BUF->retrans_timer !=0) {
|
|
uip_netif_physical_if.retrans_timer = ntohl(UIP_ND6_RA_BUF->retrans_timer);
|
|
}
|
|
|
|
/*
|
|
* Note: in our implementation, an entry in the default router list contains
|
|
* does not contain the IP address of the router. The entry has a pointer
|
|
* to the corresponding neighbor cache entry, where the IP address is stored
|
|
*/
|
|
/* Options reading: possible options are MTU, SLLAO, prefix */
|
|
nd6_opt_llao = NULL;
|
|
nd6_opt_mtu = NULL;
|
|
for(i = 0; i < UIP_CONF_ND6_MAX_PREFIXES; i++) {
|
|
nd6_opt_prefix_info[i] = NULL;
|
|
}
|
|
nd6_opt_offset = UIP_ND6_RA_LEN;
|
|
while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) {
|
|
if(UIP_ND6_OPT_HDR_BUF->len == 0) {
|
|
goto badpkt;
|
|
}
|
|
switch(UIP_ND6_OPT_HDR_BUF->type) {
|
|
case UIP_ND6_OPT_SLLAO:
|
|
nd6_opt_llao = (struct uip_nd6_opt_llao *)UIP_ND6_OPT_HDR_BUF;
|
|
break;
|
|
case UIP_ND6_OPT_MTU:
|
|
nd6_opt_mtu = (struct uip_nd6_opt_mtu *)UIP_ND6_OPT_HDR_BUF;
|
|
break;
|
|
case UIP_ND6_OPT_PREFIX_INFO:
|
|
i = 0;
|
|
while((i < UIP_CONF_ND6_MAX_PREFIXES) && (nd6_opt_prefix_info[i] != NULL)) {
|
|
i++;
|
|
}
|
|
if(i < UIP_CONF_ND6_MAX_PREFIXES) {
|
|
nd6_opt_prefix_info[i] = (struct uip_nd6_opt_prefix_info *)UIP_ND6_OPT_HDR_BUF;
|
|
}
|
|
break;
|
|
default:
|
|
UIP_LOG("ND option not supported in RA");
|
|
break;
|
|
}
|
|
nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3);
|
|
}
|
|
|
|
/* Process the MTU option if any */
|
|
if(nd6_opt_mtu != NULL) {
|
|
/* just set the link MTU to the value specified. Note that this option */
|
|
PRINTF("Processing MTU option in RA\n");
|
|
uip_netif_physical_if.link_mtu = ntohl(nd6_opt_mtu->mtu);
|
|
}
|
|
|
|
/* Prefix information options processing */
|
|
i = 0;
|
|
while((i < UIP_CONF_ND6_MAX_PREFIXES - 1) && (nd6_opt_prefix_info[i] != NULL)) {
|
|
PRINTF("Processing PREFIX option in RA\n");
|
|
|
|
if((ntohl((nd6_opt_prefix_info[i])->validlt) >=
|
|
ntohl((nd6_opt_prefix_info[i])->preferredlt)) &&
|
|
(!uip_is_addr_link_local(&nd6_opt_prefix_info[i]->prefix))) {
|
|
/* on-link flag related processing*/
|
|
if(((nd6_opt_prefix_info[i])->flagsreserved1 & 0x80) == 0x80) {
|
|
prefix = uip_nd6_prefix_lookup(&(nd6_opt_prefix_info[i])->prefix);
|
|
if(prefix == NULL) {
|
|
if((nd6_opt_prefix_info[i])->validlt != 0){
|
|
if((nd6_opt_prefix_info[i])->validlt != UIP_ND6_INFINITE_LIFETIME){
|
|
prefix = uip_nd6_prefix_add(&(nd6_opt_prefix_info[i])->prefix,
|
|
(nd6_opt_prefix_info[i])->preflen,
|
|
ntohl((nd6_opt_prefix_info[i])->validlt));
|
|
} else {
|
|
prefix = uip_nd6_prefix_add(&(nd6_opt_prefix_info[i])->prefix,
|
|
(nd6_opt_prefix_info[i])->preflen,
|
|
0);
|
|
}
|
|
}
|
|
} else {
|
|
/* we update or remove an existing prefix */
|
|
switch((nd6_opt_prefix_info[i])->validlt) {
|
|
case 0:
|
|
uip_nd6_prefix_rm(prefix);
|
|
break;
|
|
case UIP_ND6_INFINITE_LIFETIME:
|
|
prefix->is_infinite = 1;
|
|
break;
|
|
default:
|
|
PRINTF("Updating timer of prefix");
|
|
PRINT6ADDR(prefix);
|
|
PRINTF("new value %lu\n", ntohl((nd6_opt_prefix_info[i])->validlt));
|
|
stimer_set(&prefix->vlifetime, ntohl((nd6_opt_prefix_info[i])->validlt));
|
|
/*in case the prefix lifetime was previously infinite */
|
|
prefix->is_infinite = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* End of on-link flag related processing */
|
|
/* autonomous flag related processing*/
|
|
if((((nd6_opt_prefix_info[i])->flagsreserved1 & 0x40) == 0x40) &&
|
|
((nd6_opt_prefix_info[i])->validlt != 0)){
|
|
ifaddr = uip_netif_addr_lookup(&(nd6_opt_prefix_info[i])->prefix,
|
|
(nd6_opt_prefix_info[i])->preflen,
|
|
AUTOCONF);
|
|
if(ifaddr != NULL) {
|
|
if((nd6_opt_prefix_info[i])->validlt != UIP_ND6_INFINITE_LIFETIME) {
|
|
/* The processing below is defined in RFC4862 section 5.5.3 e */
|
|
if((ntohl((nd6_opt_prefix_info[i])->validlt) > 2 * 60 * 60) ||
|
|
(ntohl((nd6_opt_prefix_info[i])->validlt)> stimer_remaining(&ifaddr->vlifetime))) {
|
|
PRINTF("Updating timer of address");
|
|
PRINT6ADDR(&ifaddr->ipaddr);
|
|
PRINTF("new value %lu\n", ntohl((nd6_opt_prefix_info[i])->validlt));
|
|
stimer_set(&ifaddr->vlifetime, ntohl((nd6_opt_prefix_info[i])->validlt));
|
|
} else {
|
|
stimer_set(&ifaddr->vlifetime, 2 * 60 * 60);
|
|
|
|
PRINTF("Updating timer of address ");
|
|
PRINT6ADDR(&ifaddr->ipaddr);
|
|
PRINTF("new value %lu\n", (unsigned long)(2 * 60 * 60));
|
|
}
|
|
/*in case the address lifetime was previously infinite */
|
|
ifaddr->is_infinite = 0;
|
|
} else {
|
|
ifaddr->is_infinite = 1;
|
|
}
|
|
} else {
|
|
/* Autoconfigure an address*/
|
|
if((nd6_opt_prefix_info[i])->validlt != UIP_ND6_INFINITE_LIFETIME) {
|
|
/* Add an address with FINITE lifetime */
|
|
uip_netif_addr_add(&(nd6_opt_prefix_info[i])->prefix,
|
|
(nd6_opt_prefix_info[i])->preflen,
|
|
ntohl((nd6_opt_prefix_info[i])->validlt),
|
|
AUTOCONF);
|
|
} else {
|
|
/* Add an address with INFINITE lifetime */
|
|
uip_netif_addr_add(&(nd6_opt_prefix_info[i])->prefix,
|
|
(nd6_opt_prefix_info[i])->preflen,
|
|
0,
|
|
AUTOCONF);
|
|
}
|
|
}
|
|
}
|
|
/* End of autonomous flag related processing */
|
|
}
|
|
i++;
|
|
}
|
|
/* End of Prefix Information Option processing*/
|
|
|
|
|
|
/* SLLAO option processing */
|
|
neighbor = uip_nd6_nbrcache_lookup(&UIP_IP_BUF->srcipaddr);
|
|
if(nd6_opt_llao != NULL) {
|
|
PRINTF("Processing SLLAO option in RA\n");
|
|
if(neighbor == NULL) {
|
|
neighbor = uip_nd6_nbrcache_add(&UIP_IP_BUF->srcipaddr,
|
|
&nd6_opt_llao->addr, 1, STALE);
|
|
} else {
|
|
if(neighbor->state == INCOMPLETE) {
|
|
neighbor->state = STALE;
|
|
}
|
|
/* check if there was an address change. it applies to the case
|
|
* where if the router ND entry was in state NO_STATE */
|
|
if(memcmp(&nd6_opt_llao->addr, &neighbor->lladdr, UIP_LLADDR_LEN) != 0) {
|
|
memcpy(&neighbor->lladdr, &nd6_opt_llao->addr, UIP_LLADDR_LEN);
|
|
neighbor->state = STALE;
|
|
}
|
|
/*in case the neighbor was not a router before */
|
|
neighbor->isrouter = 1;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* As per RFC4861, section 6.3.4, and considering that in our
|
|
* implementation, a router entry contains a pointer to an existing
|
|
* neighbor entry:
|
|
* if router lifetime != 0, if entry present in def router list
|
|
* (and therefore neighbor cache), update timer, and update neighbor entry
|
|
* if needed
|
|
* else add entry to both router list (and neighbor cache if absent)
|
|
* else delete entry in router list if it exists
|
|
*/
|
|
if(UIP_ND6_RA_BUF->router_lifetime != 0) {
|
|
/* Add router or update timer, we need a neighbor entry for this */
|
|
if(neighbor == NULL) {
|
|
neighbor = uip_nd6_nbrcache_add(&UIP_IP_BUF->srcipaddr, NULL, 1, NO_STATE);
|
|
} else {
|
|
/* in case the neighbor was not a router before */
|
|
neighbor->isrouter = 1;
|
|
}
|
|
if((router = uip_nd6_defrouter_lookup(neighbor)) == NULL) {
|
|
uip_nd6_defrouter_add(neighbor, (unsigned long)(ntohs(UIP_ND6_RA_BUF->router_lifetime)));
|
|
} else {
|
|
stimer_set(&(router->lifetime), (unsigned long)(ntohs(UIP_ND6_RA_BUF->router_lifetime)));
|
|
}
|
|
} else {
|
|
/* delete router entry*/
|
|
if(neighbor != NULL) {
|
|
router = uip_nd6_defrouter_lookup(neighbor);
|
|
if(router != NULL) {
|
|
uip_nd6_defrouter_rm(router);
|
|
}
|
|
}
|
|
}
|
|
|
|
#if UIP_CONF_IPV6_QUEUE_PKT
|
|
/*
|
|
* If the neighbor just became reachable (e.g. it was in INCOMPLETE state
|
|
* and we got a SLLAO), check if we had buffered a pkt for it
|
|
*/
|
|
if((neighbor != NULL) && (neighbor->queue_buf_len != 0)) {
|
|
uip_len = neighbor->queue_buf_len;
|
|
memcpy(UIP_IP_BUF, neighbor->queue_buf, uip_len);
|
|
neighbor->queue_buf_len = 0;
|
|
return;
|
|
}
|
|
#endif /*UIP_CONF_IPV6_QUEUE_PKT*/
|
|
uip_len = 0;
|
|
return;
|
|
|
|
badpkt:
|
|
UIP_STAT(++uip_stat.nd6.drop);
|
|
UIP_LOG("RA received is bad");
|
|
uip_len = 0;
|
|
return;
|
|
}
|
|
|
|
|
|
/** @} */
|