[457] | 1 | /**
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| 2 | * @file
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| 3 | *
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| 4 | * Neighbor discovery and stateless address autoconfiguration for IPv6.
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| 5 | * Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862
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| 6 | * (Address autoconfiguration).
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| 7 | */
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| 8 |
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| 9 | /*
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| 10 | * Copyright (c) 2010 Inico Technologies Ltd.
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| 11 | * All rights reserved.
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| 12 | *
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| 13 | * Redistribution and use in source and binary forms, with or without modification,
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| 14 | * are permitted provided that the following conditions are met:
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| 15 | *
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| 16 | * 1. Redistributions of source code must retain the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer.
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| 18 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 19 | * this list of conditions and the following disclaimer in the documentation
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| 20 | * and/or other materials provided with the distribution.
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| 21 | * 3. The name of the author may not be used to endorse or promote products
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| 22 | * derived from this software without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 27 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 32 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 33 | * OF SUCH DAMAGE.
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| 34 | *
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| 35 | * This file is part of the lwIP TCP/IP stack.
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| 36 | *
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| 37 | * Author: Ivan Delamer <delamer@inicotech.com>
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| 38 | *
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| 39 | *
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| 40 | * Please coordinate changes and requests with Ivan Delamer
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| 41 | * <delamer@inicotech.com>
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| 42 | */
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| 43 |
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| 44 | #ifndef LWIP_HDR_ND6_PRIV_H
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| 45 | #define LWIP_HDR_ND6_PRIV_H
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| 46 |
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| 47 | #include "lwip/opt.h"
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| 48 |
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| 49 | #if LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */
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| 50 |
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| 51 | #include "lwip/pbuf.h"
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| 52 | #include "lwip/ip6_addr.h"
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| 53 | #include "lwip/netif.h"
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| 54 |
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| 55 |
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| 56 | #ifdef __cplusplus
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| 57 | extern "C" {
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| 58 | #endif
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| 59 |
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| 60 | #if LWIP_ND6_QUEUEING
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| 61 | /** struct for queueing outgoing packets for unknown address
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| 62 | * defined here to be accessed by memp.h
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| 63 | */
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| 64 | struct nd6_q_entry {
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| 65 | struct nd6_q_entry *next;
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| 66 | struct pbuf *p;
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| 67 | };
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| 68 | #endif /* LWIP_ND6_QUEUEING */
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| 69 |
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| 70 | /** Struct for tables. */
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| 71 | struct nd6_neighbor_cache_entry {
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| 72 | ip6_addr_t next_hop_address;
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| 73 | struct netif *netif;
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| 74 | u8_t lladdr[NETIF_MAX_HWADDR_LEN];
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| 75 | /*u32_t pmtu;*/
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| 76 | #if LWIP_ND6_QUEUEING
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| 77 | /** Pointer to queue of pending outgoing packets on this entry. */
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| 78 | struct nd6_q_entry *q;
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| 79 | #else /* LWIP_ND6_QUEUEING */
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| 80 | /** Pointer to a single pending outgoing packet on this entry. */
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| 81 | struct pbuf *q;
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| 82 | #endif /* LWIP_ND6_QUEUEING */
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| 83 | u8_t state;
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| 84 | u8_t isrouter;
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| 85 | union {
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| 86 | u32_t reachable_time; /* in seconds */
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| 87 | u32_t delay_time; /* ticks (ND6_TMR_INTERVAL) */
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| 88 | u32_t probes_sent;
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| 89 | u32_t stale_time; /* ticks (ND6_TMR_INTERVAL) */
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| 90 | } counter;
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| 91 | };
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| 92 |
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| 93 | struct nd6_destination_cache_entry {
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| 94 | ip6_addr_t destination_addr;
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| 95 | ip6_addr_t next_hop_addr;
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| 96 | u16_t pmtu;
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| 97 | u32_t age;
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| 98 | };
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| 99 |
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| 100 | struct nd6_prefix_list_entry {
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| 101 | ip6_addr_t prefix;
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| 102 | struct netif *netif;
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| 103 | u32_t invalidation_timer; /* in seconds */
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| 104 | };
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| 105 |
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| 106 | struct nd6_router_list_entry {
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| 107 | struct nd6_neighbor_cache_entry *neighbor_entry;
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| 108 | u32_t invalidation_timer; /* in seconds */
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| 109 | u8_t flags;
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| 110 | };
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| 111 |
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| 112 | enum nd6_neighbor_cache_entry_state {
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| 113 | ND6_NO_ENTRY = 0,
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| 114 | ND6_INCOMPLETE,
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| 115 | ND6_REACHABLE,
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| 116 | ND6_STALE,
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| 117 | ND6_DELAY,
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| 118 | ND6_PROBE
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| 119 | };
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| 120 |
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| 121 | #define ND6_HOPLIM 255 /* maximum hop limit, required in all ND packets */
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| 122 |
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| 123 | #define ND6_2HRS 7200 /* two hours, expressed in number of seconds */
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| 124 |
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| 125 | /* Router tables. */
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| 126 | /* @todo make these static? and entries accessible through API? */
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| 127 | extern struct nd6_neighbor_cache_entry neighbor_cache[];
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| 128 | extern struct nd6_destination_cache_entry destination_cache[];
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| 129 | extern struct nd6_prefix_list_entry prefix_list[];
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| 130 | extern struct nd6_router_list_entry default_router_list[];
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| 131 |
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| 132 | /* Default values, can be updated by a RA message. */
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| 133 | extern u32_t reachable_time;
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| 134 | extern u32_t retrans_timer;
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| 135 |
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| 136 | #ifdef __cplusplus
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| 137 | }
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| 138 | #endif
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| 139 |
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| 140 | #endif /* LWIP_IPV6 */
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| 141 |
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| 142 | #endif /* LWIP_HDR_ND6_PRIV_H */
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