lib/liblwip/include/netif/etharp.h

   1 /*
   2  * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
   3  * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
   4  * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without modification,
   8  * are permitted provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright notice,
  11  *    this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright notice,
  13  *    this list of conditions and the following disclaimer in the documentation
  14  *    and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  21  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  23  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  26  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  27  * OF SUCH DAMAGE.
  28  *
  29  * This file is part of the lwIP TCP/IP stack.
  30  *
  31  * Author: Adam Dunkels <adam@sics.se>
  32  *
  33  */
  34
  35 #ifndef __NETIF_ETHARP_H__
  36 #define __NETIF_ETHARP_H__
  37
  38 #include "lwip/opt.h"
  39
  40 #if LWIP_ARP || LWIP_ETHERNET /* don't build if not configured for use in lwipopts.h */
  41
  42 #include "lwip/pbuf.h"
  43 #include "lwip/ip_addr.h"
  44 #include "lwip/netif.h"
  45 #include "lwip/ip.h"
  46
  47 #ifdef __cplusplus
  48 extern "C" {
  49 #endif
  50
  51 #ifndef ETHARP_HWADDR_LEN
  52 #define ETHARP_HWADDR_LEN     6
  53 #endif
  54
  55 #ifdef PACK_STRUCT_USE_INCLUDES
  56 #  include "arch/bpstruct.h"
  57 #endif
  58 PACK_STRUCT_BEGIN
  59 struct eth_addr {
  60   PACK_STRUCT_FIELD(u8_t addr[ETHARP_HWADDR_LEN]);
  61 } PACK_STRUCT_STRUCT;
  62 PACK_STRUCT_END
  63 #ifdef PACK_STRUCT_USE_INCLUDES
  64 #  include "arch/epstruct.h"
  65 #endif
  66
  67 #ifdef PACK_STRUCT_USE_INCLUDES
  68 #  include "arch/bpstruct.h"
  69 #endif
  70 PACK_STRUCT_BEGIN
  71 /** Ethernet header */
  72 struct eth_hdr {
  73 #if ETH_PAD_SIZE
  74   PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
  75 #endif
  76   PACK_STRUCT_FIELD(struct eth_addr dest);
  77   PACK_STRUCT_FIELD(struct eth_addr src);
  78   PACK_STRUCT_FIELD(u16_t type);
  79 } PACK_STRUCT_STRUCT;
  80 PACK_STRUCT_END
  81 #ifdef PACK_STRUCT_USE_INCLUDES
  82 #  include "arch/epstruct.h"
  83 #endif
  84
  85 #define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
  86
  87 #if ETHARP_SUPPORT_VLAN
  88
  89 #ifdef PACK_STRUCT_USE_INCLUDES
  90 #  include "arch/bpstruct.h"
  91 #endif
  92 PACK_STRUCT_BEGIN
  93 /** VLAN header inserted between ethernet header and payload
  94  * if 'type' in ethernet header is ETHTYPE_VLAN.
  95  * See IEEE802.Q */
  96 struct eth_vlan_hdr {
  97   PACK_STRUCT_FIELD(u16_t tpid);
  98   PACK_STRUCT_FIELD(u16_t prio_vid);
  99 } PACK_STRUCT_STRUCT;
 100 PACK_STRUCT_END
 101 #ifdef PACK_STRUCT_USE_INCLUDES
 102 #  include "arch/epstruct.h"
 103 #endif
 104
 105 #define SIZEOF_VLAN_HDR 4
 106 #define VLAN_ID(vlan_hdr) (htons((vlan_hdr)->prio_vid) & 0xFFF)
 107
 108 #endif /* ETHARP_SUPPORT_VLAN */
 109
 110 #ifdef PACK_STRUCT_USE_INCLUDES
 111 #  include "arch/bpstruct.h"
 112 #endif
 113 PACK_STRUCT_BEGIN
 114 /** the ARP message, see RFC 826 ("Packet format") */
 115 struct etharp_hdr {
 116   PACK_STRUCT_FIELD(u16_t hwtype);
 117   PACK_STRUCT_FIELD(u16_t proto);
 118   PACK_STRUCT_FIELD(u8_t  hwlen);
 119   PACK_STRUCT_FIELD(u8_t  protolen);
 120   PACK_STRUCT_FIELD(u16_t opcode);
 121   PACK_STRUCT_FIELD(struct eth_addr shwaddr);
 122   PACK_STRUCT_FIELD(struct ip_addr2 sipaddr);
 123   PACK_STRUCT_FIELD(struct eth_addr dhwaddr);
 124   PACK_STRUCT_FIELD(struct ip_addr2 dipaddr);
 125 } PACK_STRUCT_STRUCT;
 126 PACK_STRUCT_END
 127 #ifdef PACK_STRUCT_USE_INCLUDES
 128 #  include "arch/epstruct.h"
 129 #endif
 130
 131 #define SIZEOF_ETHARP_HDR 28
 132 #define SIZEOF_ETHARP_PACKET (SIZEOF_ETH_HDR + SIZEOF_ETHARP_HDR)
 133
 134 /** 5 seconds period */
 135 #define ARP_TMR_INTERVAL 5000
 136
 137 #define ETHTYPE_ARP       0x0806
 138 #define ETHTYPE_IP        0x0800
 139 #define ETHTYPE_VLAN      0x8100
 140 #define ETHTYPE_PPPOEDISC 0x8863  /* PPP Over Ethernet Discovery Stage */
 141 #define ETHTYPE_PPPOE     0x8864  /* PPP Over Ethernet Session Stage */
 142
 143 /** MEMCPY-like macro to copy to/from struct eth_addr's that are local variables
 144  * or known to be 32-bit aligned within the protocol header. */
 145 #ifndef ETHADDR32_COPY
 146 #define ETHADDR32_COPY(src, dst)  SMEMCPY(src, dst, ETHARP_HWADDR_LEN)
 147 #endif
 148
 149 /** MEMCPY-like macro to copy to/from struct eth_addr's that are no local
 150  * variables and known to be 16-bit aligned within the protocol header. */
 151 #ifndef ETHADDR16_COPY
 152 #define ETHADDR16_COPY(src, dst)  SMEMCPY(src, dst, ETHARP_HWADDR_LEN)
 153 #endif
 154
 155 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
 156
 157 /** ARP message types (opcodes) */
 158 #define ARP_REQUEST 1
 159 #define ARP_REPLY   2
 160
 161 /** Define this to 1 and define LWIP_ARP_FILTER_NETIF_FN(pbuf, netif, type)
 162  * to a filter function that returns the correct netif when using multiple
 163  * netifs on one hardware interface where the netif's low-level receive
 164  * routine cannot decide for the correct netif (e.g. when mapping multiple
 165  * IP addresses to one hardware interface).
 166  */
 167 #ifndef LWIP_ARP_FILTER_NETIF
 168 #define LWIP_ARP_FILTER_NETIF 0
 169 #endif
 170
 171 #if ARP_QUEUEING
 172 /** struct for queueing outgoing packets for unknown address
 173   * defined here to be accessed by memp.h
 174   */
 175 struct etharp_q_entry {
 176   struct etharp_q_entry *next;
 177   struct pbuf *p;
 178 };
 179 #endif /* ARP_QUEUEING */
 180
 181 #define etharp_init() /* Compatibility define, not init needed. */
 182 void etharp_tmr(void);
 183 s8_t etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
 184          struct eth_addr **eth_ret, ip_addr_t **ip_ret);
 185 err_t etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr);
 186 err_t etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q);
 187 err_t etharp_request(struct netif *netif, ip_addr_t *ipaddr);
 188 /** For Ethernet network interfaces, we might want to send "gratuitous ARP";
 189  *  this is an ARP packet sent by a node in order to spontaneously cause other
 190  *  nodes to update an entry in their ARP cache.
 191  *  From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */
 192 #define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr)
 193
 194 #if ETHARP_SUPPORT_STATIC_ENTRIES
 195 err_t etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr);
 196 err_t etharp_remove_static_entry(ip_addr_t *ipaddr);
 197 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
 198
 199 #if LWIP_AUTOIP
 200 err_t etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
 201                  const struct eth_addr *ethdst_addr,
 202                  const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
 203                  const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
 204                  const u16_t opcode);
 205 #endif /* LWIP_AUTOIP */
 206
 207 #endif /* LWIP_ARP */
 208
 209 err_t ethernet_input(struct pbuf *p, struct netif *netif);
 210
 211 #define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETHARP_HWADDR_LEN) == 0)
 212
 213 extern const struct eth_addr ethbroadcast, ethzero;
 214
 215 #endif /* LWIP_ARP || LWIP_ETHERNET */
 216
 217 #ifdef __cplusplus
 218 }
 219 #endif
 220
 221 #endif /* __NETIF_ARP_H__ */