minix/lib/liblwip/dist/src/include/lwip/priv/nd6_priv.h

   1 /**
   2  * @file
   3  *
   4  * Neighbor discovery and stateless address autoconfiguration for IPv6.
   5  * Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862
   6  * (Address autoconfiguration).
   7  */
   8
   9 /*
  10  * Copyright (c) 2010 Inico Technologies Ltd.
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without modification,
  14  * are permitted provided that the following conditions are met:
  15  *
  16  * 1. Redistributions of source code must retain the above copyright notice,
  17  *    this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright notice,
  19  *    this list of conditions and the following disclaimer in the documentation
  20  *    and/or other materials provided with the distribution.
  21  * 3. The name of the author may not be used to endorse or promote products
  22  *    derived from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  25  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  27  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  28  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  29  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  32  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  33  * OF SUCH DAMAGE.
  34  *
  35  * This file is part of the lwIP TCP/IP stack.
  36  *
  37  * Author: Ivan Delamer <delamer@inicotech.com>
  38  *
  39  *
  40  * Please coordinate changes and requests with Ivan Delamer
  41  * <delamer@inicotech.com>
  42  */
  43
  44 #ifndef LWIP_HDR_ND6_PRIV_H
  45 #define LWIP_HDR_ND6_PRIV_H
  46
  47 #include "lwip/opt.h"
  48
  49 #if LWIP_IPV6  /* don't build if not configured for use in lwipopts.h */
  50
  51 #include "lwip/pbuf.h"
  52 #include "lwip/ip6_addr.h"
  53 #include "lwip/netif.h"
  54
  55
  56 #ifdef __cplusplus
  57 extern "C" {
  58 #endif
  59
  60 #if LWIP_ND6_QUEUEING
  61 /** struct for queueing outgoing packets for unknown address
  62   * defined here to be accessed by memp.h
  63   */
  64 struct nd6_q_entry {
  65   struct nd6_q_entry *next;
  66   struct pbuf *p;
  67 };
  68 #endif /* LWIP_ND6_QUEUEING */
  69
  70 /** Struct for tables. */
  71 struct nd6_neighbor_cache_entry {
  72   ip6_addr_t next_hop_address;
  73   struct netif *netif;
  74   u8_t lladdr[NETIF_MAX_HWADDR_LEN];
  75   /*u32_t pmtu;*/
  76 #if LWIP_ND6_QUEUEING
  77   /** Pointer to queue of pending outgoing packets on this entry. */
  78   struct nd6_q_entry *q;
  79 #else /* LWIP_ND6_QUEUEING */
  80   /** Pointer to a single pending outgoing packet on this entry. */
  81   struct pbuf *q;
  82 #endif /* LWIP_ND6_QUEUEING */
  83   u8_t state;
  84   u8_t isrouter;
  85   union {
  86     u32_t reachable_time; /* in seconds */
  87     u32_t delay_time;     /* ticks (ND6_TMR_INTERVAL) */
  88     u32_t probes_sent;
  89     u32_t stale_time;     /* ticks (ND6_TMR_INTERVAL) */
  90   } counter;
  91 };
  92
  93 struct nd6_destination_cache_entry {
  94   ip6_addr_t destination_addr;
  95   ip6_addr_t next_hop_addr;
  96   u16_t pmtu;
  97   u32_t age;
  98 };
  99
 100 struct nd6_prefix_list_entry {
 101   ip6_addr_t prefix;
 102   struct netif *netif;
 103   u32_t invalidation_timer; /* in seconds */
 104 };
 105
 106 struct nd6_router_list_entry {
 107   struct nd6_neighbor_cache_entry *neighbor_entry;
 108   u32_t invalidation_timer; /* in seconds */
 109   u8_t flags;
 110 };
 111
 112 enum nd6_neighbor_cache_entry_state {
 113   ND6_NO_ENTRY = 0,
 114   ND6_INCOMPLETE,
 115   ND6_REACHABLE,
 116   ND6_STALE,
 117   ND6_DELAY,
 118   ND6_PROBE
 119 };
 120
 121 #define ND6_HOPLIM 255 /* maximum hop limit, required in all ND packets */
 122
 123 #define ND6_2HRS 7200 /* two hours, expressed in number of seconds */
 124
 125 /* Router tables. */
 126 /* @todo make these static? and entries accessible through API? */
 127 extern struct nd6_neighbor_cache_entry neighbor_cache[];
 128 extern struct nd6_destination_cache_entry destination_cache[];
 129 extern struct nd6_prefix_list_entry prefix_list[];
 130 extern struct nd6_router_list_entry default_router_list[];
 131
 132 /* Default values, can be updated by a RA message. */
 133 extern u32_t reachable_time;
 134 extern u32_t retrans_timer;
 135
 136 #ifdef __cplusplus
 137 }
 138 #endif
 139
 140 #endif /* LWIP_IPV6 */
 141
 142 #endif /* LWIP_HDR_ND6_PRIV_H */