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 */ 143