1 /** 2 * @file 3 * Ethernet output function - handles OUTGOING ethernet level traffic, implements 4 * ARP resolving. 5 * To be used in most low-level netif implementations 6 */ 7 8 /* 9 * Copyright (c) 2001-2003 Swedish Institute of Computer Science. 10 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv> 11 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands. 12 * All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without modification, 15 * are permitted provided that the following conditions are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright notice, 18 * this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright notice, 20 * this list of conditions and the following disclaimer in the documentation 21 * and/or other materials provided with the distribution. 22 * 3. The name of the author may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 28 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 30 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 33 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 * 36 * This file is part of the lwIP TCP/IP stack. 37 * 38 * Author: Adam Dunkels <adam@sics.se> 39 * 40 */ 41 42 #ifndef LWIP_HDR_NETIF_ETHARP_H 43 #define LWIP_HDR_NETIF_ETHARP_H 44 45 #include "lwip/opt.h" 46 47 #if LWIP_ARP || LWIP_ETHERNET /* don't build if not configured for use in lwipopts.h */ 48 49 #include "lwip/pbuf.h" 50 #include "lwip/ip4_addr.h" 51 #include "lwip/netif.h" 52 #include "lwip/ip4.h" 53 #include "lwip/prot/ethernet.h" 54 55 #if LWIP_IPV4 && LWIP_ARP /* don't build if not configured for use in lwipopts.h */ 56 57 #include "lwip/prot/etharp.h" 58 59 #ifdef __cplusplus 60 extern "C" { 61 #endif 62 63 /** 1 seconds period */ 64 #define ARP_TMR_INTERVAL 1000 65 66 #if ARP_QUEUEING 67 /** struct for queueing outgoing packets for unknown address 68 * defined here to be accessed by memp.h 69 */ 70 struct etharp_q_entry { 71 struct etharp_q_entry *next; 72 struct pbuf *p; 73 }; 74 #endif /* ARP_QUEUEING */ 75 76 #define etharp_init() /* Compatibility define, no init needed. */ 77 void etharp_tmr(void); 78 ssize_t etharp_find_addr(struct netif *netif, const ip4_addr_t *ipaddr, 79 struct eth_addr **eth_ret, const ip4_addr_t **ip_ret); 80 int etharp_get_entry(size_t i, ip4_addr_t **ipaddr, struct netif **netif, struct eth_addr **eth_ret); 81 err_t etharp_output(struct netif *netif, struct pbuf *q, const ip4_addr_t *ipaddr); 82 err_t etharp_query(struct netif *netif, const ip4_addr_t *ipaddr, struct pbuf *q); 83 err_t etharp_request(struct netif *netif, const ip4_addr_t *ipaddr); 84 /** For Ethernet network interfaces, we might want to send "gratuitous ARP"; 85 * this is an ARP packet sent by a node in order to spontaneously cause other 86 * nodes to update an entry in their ARP cache. 87 * From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */ 88 #define etharp_gratuitous(netif) etharp_request((netif), netif_ip4_addr(netif)) 89 void etharp_cleanup_netif(struct netif *netif); 90 91 #if ETHARP_SUPPORT_STATIC_ENTRIES 92 err_t etharp_add_static_entry(const ip4_addr_t *ipaddr, struct eth_addr *ethaddr); 93 err_t etharp_remove_static_entry(const ip4_addr_t *ipaddr); 94 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */ 95 96 void etharp_input(struct pbuf *p, struct netif *netif); 97 98 #ifdef __cplusplus 99 } 100 #endif 101 102 #endif /* LWIP_IPV4 && LWIP_ARP */ 103 #endif /* LWIP_ARP || LWIP_ETHERNET */ 104 105 #endif /* LWIP_HDR_NETIF_ETHARP_H */ 106