Rod Coleman / lwip-mbed-2010

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Dependents:   LwIP_raw_API_serverExample tiny-dtls

Core/lwIP/netif/etharp.c@0:0791c1fece8e, 2012-09-18 (annotated)

Committer:
RodColeman
Date:
Tue Sep 18 14:41:24 2012 +0000
Revision:
0:0791c1fece8e
[mbed] converted /Eth_TCP_Wei_Server/lwip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RodColeman 0:0791c1fece8e 1 /**
RodColeman 0:0791c1fece8e 2 * @file
RodColeman 0:0791c1fece8e 3 * Address Resolution Protocol module for IP over Ethernet
RodColeman 0:0791c1fece8e 4 *
RodColeman 0:0791c1fece8e 5 * Functionally, ARP is divided into two parts. The first maps an IP address
RodColeman 0:0791c1fece8e 6 * to a physical address when sending a packet, and the second part answers
RodColeman 0:0791c1fece8e 7 * requests from other machines for our physical address.
RodColeman 0:0791c1fece8e 8 *
RodColeman 0:0791c1fece8e 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
RodColeman 0:0791c1fece8e 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
RodColeman 0:0791c1fece8e 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
RodColeman 0:0791c1fece8e 12 */
RodColeman 0:0791c1fece8e 13
RodColeman 0:0791c1fece8e 14 /*
RodColeman 0:0791c1fece8e 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
RodColeman 0:0791c1fece8e 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
RodColeman 0:0791c1fece8e 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
RodColeman 0:0791c1fece8e 18 * All rights reserved.
RodColeman 0:0791c1fece8e 19 *
RodColeman 0:0791c1fece8e 20 * Redistribution and use in source and binary forms, with or without modification,
RodColeman 0:0791c1fece8e 21 * are permitted provided that the following conditions are met:
RodColeman 0:0791c1fece8e 22 *
RodColeman 0:0791c1fece8e 23 * 1. Redistributions of source code must retain the above copyright notice,
RodColeman 0:0791c1fece8e 24 * this list of conditions and the following disclaimer.
RodColeman 0:0791c1fece8e 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
RodColeman 0:0791c1fece8e 26 * this list of conditions and the following disclaimer in the documentation
RodColeman 0:0791c1fece8e 27 * and/or other materials provided with the distribution.
RodColeman 0:0791c1fece8e 28 * 3. The name of the author may not be used to endorse or promote products
RodColeman 0:0791c1fece8e 29 * derived from this software without specific prior written permission.
RodColeman 0:0791c1fece8e 30 *
RodColeman 0:0791c1fece8e 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
RodColeman 0:0791c1fece8e 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
RodColeman 0:0791c1fece8e 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
RodColeman 0:0791c1fece8e 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
RodColeman 0:0791c1fece8e 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
RodColeman 0:0791c1fece8e 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
RodColeman 0:0791c1fece8e 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
RodColeman 0:0791c1fece8e 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
RodColeman 0:0791c1fece8e 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
RodColeman 0:0791c1fece8e 40 * OF SUCH DAMAGE.
RodColeman 0:0791c1fece8e 41 *
RodColeman 0:0791c1fece8e 42 * This file is part of the lwIP TCP/IP stack.
RodColeman 0:0791c1fece8e 43 *
RodColeman 0:0791c1fece8e 44 */
RodColeman 0:0791c1fece8e 45
RodColeman 0:0791c1fece8e 46 #include "lwip/opt.h"
RodColeman 0:0791c1fece8e 47
RodColeman 0:0791c1fece8e 48 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
RodColeman 0:0791c1fece8e 49
RodColeman 0:0791c1fece8e 50 #include "lwip/inet.h"
RodColeman 0:0791c1fece8e 51 #include "lwip/ip.h"
RodColeman 0:0791c1fece8e 52 #include "lwip/stats.h"
RodColeman 0:0791c1fece8e 53 #include "lwip/snmp.h"
RodColeman 0:0791c1fece8e 54 #include "lwip/dhcp.h"
RodColeman 0:0791c1fece8e 55 #include "lwip/autoip.h"
RodColeman 0:0791c1fece8e 56 #include "netif/etharp.h"
RodColeman 0:0791c1fece8e 57
RodColeman 0:0791c1fece8e 58 #if PPPOE_SUPPORT
RodColeman 0:0791c1fece8e 59 #include "netif/ppp_oe.h"
RodColeman 0:0791c1fece8e 60 #endif /* PPPOE_SUPPORT */
RodColeman 0:0791c1fece8e 61
RodColeman 0:0791c1fece8e 62 #include <string.h>
RodColeman 0:0791c1fece8e 63
RodColeman 0:0791c1fece8e 64 /** the time an ARP entry stays valid after its last update,
RodColeman 0:0791c1fece8e 65 * for ARP_TMR_INTERVAL = 5000, this is
RodColeman 0:0791c1fece8e 66 * (240 * 5) seconds = 20 minutes.
RodColeman 0:0791c1fece8e 67 */
RodColeman 0:0791c1fece8e 68 #define ARP_MAXAGE 240
RodColeman 0:0791c1fece8e 69 /** the time an ARP entry stays pending after first request,
RodColeman 0:0791c1fece8e 70 * for ARP_TMR_INTERVAL = 5000, this is
RodColeman 0:0791c1fece8e 71 * (2 * 5) seconds = 10 seconds.
RodColeman 0:0791c1fece8e 72 *
RodColeman 0:0791c1fece8e 73 * @internal Keep this number at least 2, otherwise it might
RodColeman 0:0791c1fece8e 74 * run out instantly if the timeout occurs directly after a request.
RodColeman 0:0791c1fece8e 75 */
RodColeman 0:0791c1fece8e 76 #define ARP_MAXPENDING 2
RodColeman 0:0791c1fece8e 77
RodColeman 0:0791c1fece8e 78 #define HWTYPE_ETHERNET 1
RodColeman 0:0791c1fece8e 79
RodColeman 0:0791c1fece8e 80 #define ARPH_HWLEN(hdr) (ntohs((hdr)->_hwlen_protolen) >> 8)
RodColeman 0:0791c1fece8e 81 #define ARPH_PROTOLEN(hdr) (ntohs((hdr)->_hwlen_protolen) & 0xff)
RodColeman 0:0791c1fece8e 82
RodColeman 0:0791c1fece8e 83 #define ARPH_HWLEN_SET(hdr, len) (hdr)->_hwlen_protolen = htons(ARPH_PROTOLEN(hdr) | ((len) << 8))
RodColeman 0:0791c1fece8e 84 #define ARPH_PROTOLEN_SET(hdr, len) (hdr)->_hwlen_protolen = htons((len) | (ARPH_HWLEN(hdr) << 8))
RodColeman 0:0791c1fece8e 85
RodColeman 0:0791c1fece8e 86 enum etharp_state {
RodColeman 0:0791c1fece8e 87 ETHARP_STATE_EMPTY = 0,
RodColeman 0:0791c1fece8e 88 ETHARP_STATE_PENDING,
RodColeman 0:0791c1fece8e 89 ETHARP_STATE_STABLE
RodColeman 0:0791c1fece8e 90 };
RodColeman 0:0791c1fece8e 91
RodColeman 0:0791c1fece8e 92 struct etharp_entry {
RodColeman 0:0791c1fece8e 93 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 94 /**
RodColeman 0:0791c1fece8e 95 * Pointer to queue of pending outgoing packets on this ARP entry.
RodColeman 0:0791c1fece8e 96 */
RodColeman 0:0791c1fece8e 97 struct etharp_q_entry *q;
RodColeman 0:0791c1fece8e 98 #endif
RodColeman 0:0791c1fece8e 99 struct ip_addr ipaddr;
RodColeman 0:0791c1fece8e 100 struct eth_addr ethaddr;
RodColeman 0:0791c1fece8e 101 enum etharp_state state;
RodColeman 0:0791c1fece8e 102 u8_t ctime;
RodColeman 0:0791c1fece8e 103 struct netif *netif;
RodColeman 0:0791c1fece8e 104 };
RodColeman 0:0791c1fece8e 105
RodColeman 0:0791c1fece8e 106 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
RodColeman 0:0791c1fece8e 107 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
RodColeman 0:0791c1fece8e 108 static struct etharp_entry arp_table[ARP_TABLE_SIZE] MEM_POSITION;
RodColeman 0:0791c1fece8e 109 #if !LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 110 static u8_t etharp_cached_entry MEM_POSITION;
RodColeman 0:0791c1fece8e 111 #endif
RodColeman 0:0791c1fece8e 112
RodColeman 0:0791c1fece8e 113 /**
RodColeman 0:0791c1fece8e 114 * Try hard to create a new entry - we want the IP address to appear in
RodColeman 0:0791c1fece8e 115 * the cache (even if this means removing an active entry or so). */
RodColeman 0:0791c1fece8e 116 #define ETHARP_TRY_HARD 1
RodColeman 0:0791c1fece8e 117 #define ETHARP_FIND_ONLY 2
RodColeman 0:0791c1fece8e 118
RodColeman 0:0791c1fece8e 119 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 120 #define NETIF_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
RodColeman 0:0791c1fece8e 121 *((netif)->addr_hint) = (hint);
RodColeman 0:0791c1fece8e 122 static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags, struct netif *netif);
RodColeman 0:0791c1fece8e 123 #else /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 124 static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags);
RodColeman 0:0791c1fece8e 125 #endif /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 126
RodColeman 0:0791c1fece8e 127 static err_t update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags);
RodColeman 0:0791c1fece8e 128
RodColeman 0:0791c1fece8e 129
RodColeman 0:0791c1fece8e 130 /* Some checks, instead of etharp_init(): */
RodColeman 0:0791c1fece8e 131 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
RodColeman 0:0791c1fece8e 132 #error "If you want to use ARP, ARP_TABLE_SIZE must fit in an s8_t, so, you have to reduce it in your lwipopts.h"
RodColeman 0:0791c1fece8e 133 #endif
RodColeman 0:0791c1fece8e 134
RodColeman 0:0791c1fece8e 135
RodColeman 0:0791c1fece8e 136 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 137 /**
RodColeman 0:0791c1fece8e 138 * Free a complete queue of etharp entries
RodColeman 0:0791c1fece8e 139 *
RodColeman 0:0791c1fece8e 140 * @param q a qeueue of etharp_q_entry's to free
RodColeman 0:0791c1fece8e 141 */
RodColeman 0:0791c1fece8e 142 static void
RodColeman 0:0791c1fece8e 143 free_etharp_q(struct etharp_q_entry *q)
RodColeman 0:0791c1fece8e 144 {
RodColeman 0:0791c1fece8e 145 struct etharp_q_entry *r;
RodColeman 0:0791c1fece8e 146 LWIP_ASSERT("q != NULL", q != NULL);
RodColeman 0:0791c1fece8e 147 LWIP_ASSERT("q->p != NULL", q->p != NULL);
RodColeman 0:0791c1fece8e 148 while (q) {
RodColeman 0:0791c1fece8e 149 r = q;
RodColeman 0:0791c1fece8e 150 q = q->next;
RodColeman 0:0791c1fece8e 151 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
RodColeman 0:0791c1fece8e 152 pbuf_free(r->p);
RodColeman 0:0791c1fece8e 153 memp_free(MEMP_ARP_QUEUE, r);
RodColeman 0:0791c1fece8e 154 }
RodColeman 0:0791c1fece8e 155 }
RodColeman 0:0791c1fece8e 156 #endif
RodColeman 0:0791c1fece8e 157
RodColeman 0:0791c1fece8e 158 /**
RodColeman 0:0791c1fece8e 159 * Clears expired entries in the ARP table.
RodColeman 0:0791c1fece8e 160 *
RodColeman 0:0791c1fece8e 161 * This function should be called every ETHARP_TMR_INTERVAL microseconds (5 seconds),
RodColeman 0:0791c1fece8e 162 * in order to expire entries in the ARP table.
RodColeman 0:0791c1fece8e 163 */
RodColeman 0:0791c1fece8e 164 void
RodColeman 0:0791c1fece8e 165 etharp_tmr(void)
RodColeman 0:0791c1fece8e 166 {
RodColeman 0:0791c1fece8e 167 u8_t i;
RodColeman 0:0791c1fece8e 168
RodColeman 0:0791c1fece8e 169 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
RodColeman 0:0791c1fece8e 170 /* remove expired entries from the ARP table */
RodColeman 0:0791c1fece8e 171 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
RodColeman 0:0791c1fece8e 172 arp_table[i].ctime++;
RodColeman 0:0791c1fece8e 173 if (((arp_table[i].state == ETHARP_STATE_STABLE) &&
RodColeman 0:0791c1fece8e 174 (arp_table[i].ctime >= ARP_MAXAGE)) ||
RodColeman 0:0791c1fece8e 175 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
RodColeman 0:0791c1fece8e 176 (arp_table[i].ctime >= ARP_MAXPENDING))) {
RodColeman 0:0791c1fece8e 177 /* pending or stable entry has become old! */
RodColeman 0:0791c1fece8e 178 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
RodColeman 0:0791c1fece8e 179 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
RodColeman 0:0791c1fece8e 180 /* clean up entries that have just been expired */
RodColeman 0:0791c1fece8e 181 /* remove from SNMP ARP index tree */
RodColeman 0:0791c1fece8e 182 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
RodColeman 0:0791c1fece8e 183 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 184 /* and empty packet queue */
RodColeman 0:0791c1fece8e 185 if (arp_table[i].q != NULL) {
RodColeman 0:0791c1fece8e 186 /* remove all queued packets */
RodColeman 0:0791c1fece8e 187 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
RodColeman 0:0791c1fece8e 188 free_etharp_q(arp_table[i].q);
RodColeman 0:0791c1fece8e 189 arp_table[i].q = NULL;
RodColeman 0:0791c1fece8e 190 }
RodColeman 0:0791c1fece8e 191 #endif
RodColeman 0:0791c1fece8e 192 /* recycle entry for re-use */
RodColeman 0:0791c1fece8e 193 arp_table[i].state = ETHARP_STATE_EMPTY;
RodColeman 0:0791c1fece8e 194 }
RodColeman 0:0791c1fece8e 195 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 196 /* still pending entry? (not expired) */
RodColeman 0:0791c1fece8e 197 if (arp_table[i].state == ETHARP_STATE_PENDING) {
RodColeman 0:0791c1fece8e 198 /* resend an ARP query here? */
RodColeman 0:0791c1fece8e 199 }
RodColeman 0:0791c1fece8e 200 #endif
RodColeman 0:0791c1fece8e 201 }
RodColeman 0:0791c1fece8e 202 }
RodColeman 0:0791c1fece8e 203
RodColeman 0:0791c1fece8e 204 /**
RodColeman 0:0791c1fece8e 205 * Search the ARP table for a matching or new entry.
RodColeman 0:0791c1fece8e 206 *
RodColeman 0:0791c1fece8e 207 * If an IP address is given, return a pending or stable ARP entry that matches
RodColeman 0:0791c1fece8e 208 * the address. If no match is found, create a new entry with this address set,
RodColeman 0:0791c1fece8e 209 * but in state ETHARP_EMPTY. The caller must check and possibly change the
RodColeman 0:0791c1fece8e 210 * state of the returned entry.
RodColeman 0:0791c1fece8e 211 *
RodColeman 0:0791c1fece8e 212 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
RodColeman 0:0791c1fece8e 213 *
RodColeman 0:0791c1fece8e 214 * In all cases, attempt to create new entries from an empty entry. If no
RodColeman 0:0791c1fece8e 215 * empty entries are available and ETHARP_TRY_HARD flag is set, recycle
RodColeman 0:0791c1fece8e 216 * old entries. Heuristic choose the least important entry for recycling.
RodColeman 0:0791c1fece8e 217 *
RodColeman 0:0791c1fece8e 218 * @param ipaddr IP address to find in ARP cache, or to add if not found.
RodColeman 0:0791c1fece8e 219 * @param flags
RodColeman 0:0791c1fece8e 220 * - ETHARP_TRY_HARD: Try hard to create a entry by allowing recycling of
RodColeman 0:0791c1fece8e 221 * active (stable or pending) entries.
RodColeman 0:0791c1fece8e 222 *
RodColeman 0:0791c1fece8e 223 * @return The ARP entry index that matched or is created, ERR_MEM if no
RodColeman 0:0791c1fece8e 224 * entry is found or could be recycled.
RodColeman 0:0791c1fece8e 225 */
RodColeman 0:0791c1fece8e 226 static s8_t
RodColeman 0:0791c1fece8e 227 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 228 find_entry(struct ip_addr *ipaddr, u8_t flags, struct netif *netif)
RodColeman 0:0791c1fece8e 229 #else /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 230 find_entry(struct ip_addr *ipaddr, u8_t flags)
RodColeman 0:0791c1fece8e 231 #endif /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 232 {
RodColeman 0:0791c1fece8e 233 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
RodColeman 0:0791c1fece8e 234 s8_t empty = ARP_TABLE_SIZE;
RodColeman 0:0791c1fece8e 235 u8_t i = 0, age_pending = 0, age_stable = 0;
RodColeman 0:0791c1fece8e 236 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 237 /* oldest entry with packets on queue */
RodColeman 0:0791c1fece8e 238 s8_t old_queue = ARP_TABLE_SIZE;
RodColeman 0:0791c1fece8e 239 /* its age */
RodColeman 0:0791c1fece8e 240 u8_t age_queue = 0;
RodColeman 0:0791c1fece8e 241 #endif
RodColeman 0:0791c1fece8e 242
RodColeman 0:0791c1fece8e 243 /* First, test if the last call to this function asked for the
RodColeman 0:0791c1fece8e 244 * same address. If so, we're really fast! */
RodColeman 0:0791c1fece8e 245 if (ipaddr) {
RodColeman 0:0791c1fece8e 246 /* ipaddr to search for was given */
RodColeman 0:0791c1fece8e 247 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 248 if ((netif != NULL) && (netif->addr_hint != NULL)) {
RodColeman 0:0791c1fece8e 249 /* per-pcb cached entry was given */
RodColeman 0:0791c1fece8e 250 u8_t per_pcb_cache = *(netif->addr_hint);
RodColeman 0:0791c1fece8e 251 if ((per_pcb_cache < ARP_TABLE_SIZE) && arp_table[per_pcb_cache].state == ETHARP_STATE_STABLE) {
RodColeman 0:0791c1fece8e 252 /* the per-pcb-cached entry is stable */
RodColeman 0:0791c1fece8e 253 if (ip_addr_cmp(ipaddr, &arp_table[per_pcb_cache].ipaddr)) {
RodColeman 0:0791c1fece8e 254 /* per-pcb cached entry was the right one! */
RodColeman 0:0791c1fece8e 255 ETHARP_STATS_INC(etharp.cachehit);
RodColeman 0:0791c1fece8e 256 return per_pcb_cache;
RodColeman 0:0791c1fece8e 257 }
RodColeman 0:0791c1fece8e 258 }
RodColeman 0:0791c1fece8e 259 }
RodColeman 0:0791c1fece8e 260 #else /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 261 if (arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) {
RodColeman 0:0791c1fece8e 262 /* the cached entry is stable */
RodColeman 0:0791c1fece8e 263 if (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr)) {
RodColeman 0:0791c1fece8e 264 /* cached entry was the right one! */
RodColeman 0:0791c1fece8e 265 ETHARP_STATS_INC(etharp.cachehit);
RodColeman 0:0791c1fece8e 266 return etharp_cached_entry;
RodColeman 0:0791c1fece8e 267 }
RodColeman 0:0791c1fece8e 268 }
RodColeman 0:0791c1fece8e 269 #endif /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 270 }
RodColeman 0:0791c1fece8e 271
RodColeman 0:0791c1fece8e 272 /**
RodColeman 0:0791c1fece8e 273 * a) do a search through the cache, remember candidates
RodColeman 0:0791c1fece8e 274 * b) select candidate entry
RodColeman 0:0791c1fece8e 275 * c) create new entry
RodColeman 0:0791c1fece8e 276 */
RodColeman 0:0791c1fece8e 277
RodColeman 0:0791c1fece8e 278 /* a) in a single search sweep, do all of this
RodColeman 0:0791c1fece8e 279 * 1) remember the first empty entry (if any)
RodColeman 0:0791c1fece8e 280 * 2) remember the oldest stable entry (if any)
RodColeman 0:0791c1fece8e 281 * 3) remember the oldest pending entry without queued packets (if any)
RodColeman 0:0791c1fece8e 282 * 4) remember the oldest pending entry with queued packets (if any)
RodColeman 0:0791c1fece8e 283 * 5) search for a matching IP entry, either pending or stable
RodColeman 0:0791c1fece8e 284 * until 5 matches, or all entries are searched for.
RodColeman 0:0791c1fece8e 285 */
RodColeman 0:0791c1fece8e 286
RodColeman 0:0791c1fece8e 287 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
RodColeman 0:0791c1fece8e 288 /* no empty entry found yet and now we do find one? */
RodColeman 0:0791c1fece8e 289 if ((empty == ARP_TABLE_SIZE) && (arp_table[i].state == ETHARP_STATE_EMPTY)) {
RodColeman 0:0791c1fece8e 290 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
RodColeman 0:0791c1fece8e 291 /* remember first empty entry */
RodColeman 0:0791c1fece8e 292 empty = i;
RodColeman 0:0791c1fece8e 293 }
RodColeman 0:0791c1fece8e 294 /* pending entry? */
RodColeman 0:0791c1fece8e 295 else if (arp_table[i].state == ETHARP_STATE_PENDING) {
RodColeman 0:0791c1fece8e 296 /* if given, does IP address match IP address in ARP entry? */
RodColeman 0:0791c1fece8e 297 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
RodColeman 0:0791c1fece8e 298 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching pending entry %"U16_F"\n", (u16_t)i));
RodColeman 0:0791c1fece8e 299 /* found exact IP address match, simply bail out */
RodColeman 0:0791c1fece8e 300 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 301 NETIF_SET_HINT(netif, i);
RodColeman 0:0791c1fece8e 302 #else /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 303 etharp_cached_entry = i;
RodColeman 0:0791c1fece8e 304 #endif /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 305 return i;
RodColeman 0:0791c1fece8e 306 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 307 /* pending with queued packets? */
RodColeman 0:0791c1fece8e 308 } else if (arp_table[i].q != NULL) {
RodColeman 0:0791c1fece8e 309 if (arp_table[i].ctime >= age_queue) {
RodColeman 0:0791c1fece8e 310 old_queue = i;
RodColeman 0:0791c1fece8e 311 age_queue = arp_table[i].ctime;
RodColeman 0:0791c1fece8e 312 }
RodColeman 0:0791c1fece8e 313 #endif
RodColeman 0:0791c1fece8e 314 /* pending without queued packets? */
RodColeman 0:0791c1fece8e 315 } else {
RodColeman 0:0791c1fece8e 316 if (arp_table[i].ctime >= age_pending) {
RodColeman 0:0791c1fece8e 317 old_pending = i;
RodColeman 0:0791c1fece8e 318 age_pending = arp_table[i].ctime;
RodColeman 0:0791c1fece8e 319 }
RodColeman 0:0791c1fece8e 320 }
RodColeman 0:0791c1fece8e 321 }
RodColeman 0:0791c1fece8e 322 /* stable entry? */
RodColeman 0:0791c1fece8e 323 else if (arp_table[i].state == ETHARP_STATE_STABLE) {
RodColeman 0:0791c1fece8e 324 /* if given, does IP address match IP address in ARP entry? */
RodColeman 0:0791c1fece8e 325 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
RodColeman 0:0791c1fece8e 326 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching stable entry %"U16_F"\n", (u16_t)i));
RodColeman 0:0791c1fece8e 327 /* found exact IP address match, simply bail out */
RodColeman 0:0791c1fece8e 328 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 329 NETIF_SET_HINT(netif, i);
RodColeman 0:0791c1fece8e 330 #else /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 331 etharp_cached_entry = i;
RodColeman 0:0791c1fece8e 332 #endif /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 333 return i;
RodColeman 0:0791c1fece8e 334 /* remember entry with oldest stable entry in oldest, its age in maxtime */
RodColeman 0:0791c1fece8e 335 } else if (arp_table[i].ctime >= age_stable) {
RodColeman 0:0791c1fece8e 336 old_stable = i;
RodColeman 0:0791c1fece8e 337 age_stable = arp_table[i].ctime;
RodColeman 0:0791c1fece8e 338 }
RodColeman 0:0791c1fece8e 339 }
RodColeman 0:0791c1fece8e 340 }
RodColeman 0:0791c1fece8e 341 /* { we have no match } => try to create a new entry */
RodColeman 0:0791c1fece8e 342
RodColeman 0:0791c1fece8e 343 /* no empty entry found and not allowed to recycle? */
RodColeman 0:0791c1fece8e 344 if (((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_TRY_HARD) == 0))
RodColeman 0:0791c1fece8e 345 /* or don't create new entry, only search? */
RodColeman 0:0791c1fece8e 346 || ((flags & ETHARP_FIND_ONLY) != 0)) {
RodColeman 0:0791c1fece8e 347 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
RodColeman 0:0791c1fece8e 348 return (s8_t)ERR_MEM;
RodColeman 0:0791c1fece8e 349 }
RodColeman 0:0791c1fece8e 350
RodColeman 0:0791c1fece8e 351 /* b) choose the least destructive entry to recycle:
RodColeman 0:0791c1fece8e 352 * 1) empty entry
RodColeman 0:0791c1fece8e 353 * 2) oldest stable entry
RodColeman 0:0791c1fece8e 354 * 3) oldest pending entry without queued packets
RodColeman 0:0791c1fece8e 355 * 4) oldest pending entry with queued packets
RodColeman 0:0791c1fece8e 356 *
RodColeman 0:0791c1fece8e 357 * { ETHARP_TRY_HARD is set at this point }
RodColeman 0:0791c1fece8e 358 */
RodColeman 0:0791c1fece8e 359
RodColeman 0:0791c1fece8e 360 /* 1) empty entry available? */
RodColeman 0:0791c1fece8e 361 if (empty < ARP_TABLE_SIZE) {
RodColeman 0:0791c1fece8e 362 i = empty;
RodColeman 0:0791c1fece8e 363 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
RodColeman 0:0791c1fece8e 364 }
RodColeman 0:0791c1fece8e 365 /* 2) found recyclable stable entry? */
RodColeman 0:0791c1fece8e 366 else if (old_stable < ARP_TABLE_SIZE) {
RodColeman 0:0791c1fece8e 367 /* recycle oldest stable*/
RodColeman 0:0791c1fece8e 368 i = old_stable;
RodColeman 0:0791c1fece8e 369 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
RodColeman 0:0791c1fece8e 370 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 371 /* no queued packets should exist on stable entries */
RodColeman 0:0791c1fece8e 372 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
RodColeman 0:0791c1fece8e 373 #endif
RodColeman 0:0791c1fece8e 374 /* 3) found recyclable pending entry without queued packets? */
RodColeman 0:0791c1fece8e 375 } else if (old_pending < ARP_TABLE_SIZE) {
RodColeman 0:0791c1fece8e 376 /* recycle oldest pending */
RodColeman 0:0791c1fece8e 377 i = old_pending;
RodColeman 0:0791c1fece8e 378 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
RodColeman 0:0791c1fece8e 379 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 380 /* 4) found recyclable pending entry with queued packets? */
RodColeman 0:0791c1fece8e 381 } else if (old_queue < ARP_TABLE_SIZE) {
RodColeman 0:0791c1fece8e 382 /* recycle oldest pending */
RodColeman 0:0791c1fece8e 383 i = old_queue;
RodColeman 0:0791c1fece8e 384 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
RodColeman 0:0791c1fece8e 385 free_etharp_q(arp_table[i].q);
RodColeman 0:0791c1fece8e 386 arp_table[i].q = NULL;
RodColeman 0:0791c1fece8e 387 #endif
RodColeman 0:0791c1fece8e 388 /* no empty or recyclable entries found */
RodColeman 0:0791c1fece8e 389 } else {
RodColeman 0:0791c1fece8e 390 return (s8_t)ERR_MEM;
RodColeman 0:0791c1fece8e 391 }
RodColeman 0:0791c1fece8e 392
RodColeman 0:0791c1fece8e 393 /* { empty or recyclable entry found } */
RodColeman 0:0791c1fece8e 394 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
RodColeman 0:0791c1fece8e 395
RodColeman 0:0791c1fece8e 396 if (arp_table[i].state != ETHARP_STATE_EMPTY)
RodColeman 0:0791c1fece8e 397 {
RodColeman 0:0791c1fece8e 398 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
RodColeman 0:0791c1fece8e 399 }
RodColeman 0:0791c1fece8e 400 /* recycle entry (no-op for an already empty entry) */
RodColeman 0:0791c1fece8e 401 arp_table[i].state = ETHARP_STATE_EMPTY;
RodColeman 0:0791c1fece8e 402
RodColeman 0:0791c1fece8e 403 /* IP address given? */
RodColeman 0:0791c1fece8e 404 if (ipaddr != NULL) {
RodColeman 0:0791c1fece8e 405 /* set IP address */
RodColeman 0:0791c1fece8e 406 ip_addr_set(&arp_table[i].ipaddr, ipaddr);
RodColeman 0:0791c1fece8e 407 }
RodColeman 0:0791c1fece8e 408 arp_table[i].ctime = 0;
RodColeman 0:0791c1fece8e 409 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 410 NETIF_SET_HINT(netif, i);
RodColeman 0:0791c1fece8e 411 #else /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 412 etharp_cached_entry = i;
RodColeman 0:0791c1fece8e 413 #endif /* #if LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 414 return (err_t)i;
RodColeman 0:0791c1fece8e 415 }
RodColeman 0:0791c1fece8e 416
RodColeman 0:0791c1fece8e 417 /**
RodColeman 0:0791c1fece8e 418 * Send an IP packet on the network using netif->linkoutput
RodColeman 0:0791c1fece8e 419 * The ethernet header is filled in before sending.
RodColeman 0:0791c1fece8e 420 *
RodColeman 0:0791c1fece8e 421 * @params netif the lwIP network interface on which to send the packet
RodColeman 0:0791c1fece8e 422 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
RodColeman 0:0791c1fece8e 423 * @params src the source MAC address to be copied into the ethernet header
RodColeman 0:0791c1fece8e 424 * @params dst the destination MAC address to be copied into the ethernet header
RodColeman 0:0791c1fece8e 425 * @return ERR_OK if the packet was sent, any other err_t on failure
RodColeman 0:0791c1fece8e 426 */
RodColeman 0:0791c1fece8e 427 static err_t
RodColeman 0:0791c1fece8e 428 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
RodColeman 0:0791c1fece8e 429 {
RodColeman 0:0791c1fece8e 430 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
RodColeman 0:0791c1fece8e 431 u8_t k;
RodColeman 0:0791c1fece8e 432
RodColeman 0:0791c1fece8e 433 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
RodColeman 0:0791c1fece8e 434 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
RodColeman 0:0791c1fece8e 435 k = ETHARP_HWADDR_LEN;
RodColeman 0:0791c1fece8e 436 while(k > 0) {
RodColeman 0:0791c1fece8e 437 k--;
RodColeman 0:0791c1fece8e 438 ethhdr->dest.addr[k] = dst->addr[k];
RodColeman 0:0791c1fece8e 439 ethhdr->src.addr[k] = src->addr[k];
RodColeman 0:0791c1fece8e 440 }
RodColeman 0:0791c1fece8e 441 ethhdr->type = htons(ETHTYPE_IP);
RodColeman 0:0791c1fece8e 442 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
RodColeman 0:0791c1fece8e 443 /* send the packet */
RodColeman 0:0791c1fece8e 444 return netif->linkoutput(netif, p);
RodColeman 0:0791c1fece8e 445 }
RodColeman 0:0791c1fece8e 446
RodColeman 0:0791c1fece8e 447 /**
RodColeman 0:0791c1fece8e 448 * Update (or insert) a IP/MAC address pair in the ARP cache.
RodColeman 0:0791c1fece8e 449 *
RodColeman 0:0791c1fece8e 450 * If a pending entry is resolved, any queued packets will be sent
RodColeman 0:0791c1fece8e 451 * at this point.
RodColeman 0:0791c1fece8e 452 *
RodColeman 0:0791c1fece8e 453 * @param ipaddr IP address of the inserted ARP entry.
RodColeman 0:0791c1fece8e 454 * @param ethaddr Ethernet address of the inserted ARP entry.
RodColeman 0:0791c1fece8e 455 * @param flags Defines behaviour:
RodColeman 0:0791c1fece8e 456 * - ETHARP_TRY_HARD Allows ARP to insert this as a new item. If not specified,
RodColeman 0:0791c1fece8e 457 * only existing ARP entries will be updated.
RodColeman 0:0791c1fece8e 458 *
RodColeman 0:0791c1fece8e 459 * @return
RodColeman 0:0791c1fece8e 460 * - ERR_OK Succesfully updated ARP cache.
RodColeman 0:0791c1fece8e 461 * - ERR_MEM If we could not add a new ARP entry when ETHARP_TRY_HARD was set.
RodColeman 0:0791c1fece8e 462 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
RodColeman 0:0791c1fece8e 463 *
RodColeman 0:0791c1fece8e 464 * @see pbuf_free()
RodColeman 0:0791c1fece8e 465 */
RodColeman 0:0791c1fece8e 466 static err_t
RodColeman 0:0791c1fece8e 467 update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags)
RodColeman 0:0791c1fece8e 468 {
RodColeman 0:0791c1fece8e 469 s8_t i;
RodColeman 0:0791c1fece8e 470 u8_t k;
RodColeman 0:0791c1fece8e 471 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 3, ("update_arp_entry()\n"));
RodColeman 0:0791c1fece8e 472 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
RodColeman 0:0791c1fece8e 473 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
RodColeman 0:0791c1fece8e 474 ip4_addr1(ipaddr), ip4_addr2(ipaddr), ip4_addr3(ipaddr), ip4_addr4(ipaddr),
RodColeman 0:0791c1fece8e 475 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
RodColeman 0:0791c1fece8e 476 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
RodColeman 0:0791c1fece8e 477 /* non-unicast address? */
RodColeman 0:0791c1fece8e 478 if (ip_addr_isany(ipaddr) ||
RodColeman 0:0791c1fece8e 479 ip_addr_isbroadcast(ipaddr, netif) ||
RodColeman 0:0791c1fece8e 480 ip_addr_ismulticast(ipaddr)) {
RodColeman 0:0791c1fece8e 481 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
RodColeman 0:0791c1fece8e 482 return ERR_ARG;
RodColeman 0:0791c1fece8e 483 }
RodColeman 0:0791c1fece8e 484 /* find or create ARP entry */
RodColeman 0:0791c1fece8e 485 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 486 i = find_entry(ipaddr, flags, netif);
RodColeman 0:0791c1fece8e 487 #else /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 488 i = find_entry(ipaddr, flags);
RodColeman 0:0791c1fece8e 489 #endif /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 490 /* bail out if no entry could be found */
RodColeman 0:0791c1fece8e 491 if (i < 0)
RodColeman 0:0791c1fece8e 492 return (err_t)i;
RodColeman 0:0791c1fece8e 493
RodColeman 0:0791c1fece8e 494 /* mark it stable */
RodColeman 0:0791c1fece8e 495 arp_table[i].state = ETHARP_STATE_STABLE;
RodColeman 0:0791c1fece8e 496 /* record network interface */
RodColeman 0:0791c1fece8e 497 arp_table[i].netif = netif;
RodColeman 0:0791c1fece8e 498
RodColeman 0:0791c1fece8e 499 /* insert in SNMP ARP index tree */
RodColeman 0:0791c1fece8e 500 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
RodColeman 0:0791c1fece8e 501
RodColeman 0:0791c1fece8e 502 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
RodColeman 0:0791c1fece8e 503 /* update address */
RodColeman 0:0791c1fece8e 504 k = ETHARP_HWADDR_LEN;
RodColeman 0:0791c1fece8e 505 while (k > 0) {
RodColeman 0:0791c1fece8e 506 k--;
RodColeman 0:0791c1fece8e 507 arp_table[i].ethaddr.addr[k] = ethaddr->addr[k];
RodColeman 0:0791c1fece8e 508 }
RodColeman 0:0791c1fece8e 509 /* reset time stamp */
RodColeman 0:0791c1fece8e 510 arp_table[i].ctime = 0;
RodColeman 0:0791c1fece8e 511 #if ARP_QUEUEING
RodColeman 0:0791c1fece8e 512 /* this is where we will send out queued packets! */
RodColeman 0:0791c1fece8e 513 while (arp_table[i].q != NULL) {
RodColeman 0:0791c1fece8e 514 struct pbuf *p;
RodColeman 0:0791c1fece8e 515 /* remember remainder of queue */
RodColeman 0:0791c1fece8e 516 struct etharp_q_entry *q = arp_table[i].q;
RodColeman 0:0791c1fece8e 517 /* pop first item off the queue */
RodColeman 0:0791c1fece8e 518 arp_table[i].q = q->next;
RodColeman 0:0791c1fece8e 519 /* get the packet pointer */
RodColeman 0:0791c1fece8e 520 p = q->p;
RodColeman 0:0791c1fece8e 521 /* now queue entry can be freed */
RodColeman 0:0791c1fece8e 522 memp_free(MEMP_ARP_QUEUE, q);
RodColeman 0:0791c1fece8e 523 /* send the queued IP packet */
RodColeman 0:0791c1fece8e 524 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
RodColeman 0:0791c1fece8e 525 /* free the queued IP packet */
RodColeman 0:0791c1fece8e 526 pbuf_free(p);
RodColeman 0:0791c1fece8e 527 }
RodColeman 0:0791c1fece8e 528 #endif
RodColeman 0:0791c1fece8e 529 return ERR_OK;
RodColeman 0:0791c1fece8e 530 }
RodColeman 0:0791c1fece8e 531
RodColeman 0:0791c1fece8e 532 /**
RodColeman 0:0791c1fece8e 533 * Finds (stable) ethernet/IP address pair from ARP table
RodColeman 0:0791c1fece8e 534 * using interface and IP address index.
RodColeman 0:0791c1fece8e 535 * @note the addresses in the ARP table are in network order!
RodColeman 0:0791c1fece8e 536 *
RodColeman 0:0791c1fece8e 537 * @param netif points to interface index
RodColeman 0:0791c1fece8e 538 * @param ipaddr points to the (network order) IP address index
RodColeman 0:0791c1fece8e 539 * @param eth_ret points to return pointer
RodColeman 0:0791c1fece8e 540 * @param ip_ret points to return pointer
RodColeman 0:0791c1fece8e 541 * @return table index if found, -1 otherwise
RodColeman 0:0791c1fece8e 542 */
RodColeman 0:0791c1fece8e 543 s8_t
RodColeman 0:0791c1fece8e 544 etharp_find_addr(struct netif *netif, struct ip_addr *ipaddr,
RodColeman 0:0791c1fece8e 545 struct eth_addr **eth_ret, struct ip_addr **ip_ret)
RodColeman 0:0791c1fece8e 546 {
RodColeman 0:0791c1fece8e 547 s8_t i;
RodColeman 0:0791c1fece8e 548
RodColeman 0:0791c1fece8e 549 LWIP_UNUSED_ARG(netif);
RodColeman 0:0791c1fece8e 550
RodColeman 0:0791c1fece8e 551 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 552 i = find_entry(ipaddr, ETHARP_FIND_ONLY, NULL);
RodColeman 0:0791c1fece8e 553 #else /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 554 i = find_entry(ipaddr, ETHARP_FIND_ONLY);
RodColeman 0:0791c1fece8e 555 #endif /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 556 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
RodColeman 0:0791c1fece8e 557 *eth_ret = &arp_table[i].ethaddr;
RodColeman 0:0791c1fece8e 558 *ip_ret = &arp_table[i].ipaddr;
RodColeman 0:0791c1fece8e 559 return i;
RodColeman 0:0791c1fece8e 560 }
RodColeman 0:0791c1fece8e 561 return -1;
RodColeman 0:0791c1fece8e 562 }
RodColeman 0:0791c1fece8e 563
RodColeman 0:0791c1fece8e 564 /**
RodColeman 0:0791c1fece8e 565 * Updates the ARP table using the given IP packet.
RodColeman 0:0791c1fece8e 566 *
RodColeman 0:0791c1fece8e 567 * Uses the incoming IP packet's source address to update the
RodColeman 0:0791c1fece8e 568 * ARP cache for the local network. The function does not alter
RodColeman 0:0791c1fece8e 569 * or free the packet. This function must be called before the
RodColeman 0:0791c1fece8e 570 * packet p is passed to the IP layer.
RodColeman 0:0791c1fece8e 571 *
RodColeman 0:0791c1fece8e 572 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
RodColeman 0:0791c1fece8e 573 * @param p The IP packet that arrived on netif.
RodColeman 0:0791c1fece8e 574 *
RodColeman 0:0791c1fece8e 575 * @return NULL
RodColeman 0:0791c1fece8e 576 *
RodColeman 0:0791c1fece8e 577 * @see pbuf_free()
RodColeman 0:0791c1fece8e 578 */
RodColeman 0:0791c1fece8e 579 void
RodColeman 0:0791c1fece8e 580 etharp_ip_input(struct netif *netif, struct pbuf *p)
RodColeman 0:0791c1fece8e 581 {
RodColeman 0:0791c1fece8e 582 struct eth_hdr *ethhdr;
RodColeman 0:0791c1fece8e 583 struct ip_hdr *iphdr;
RodColeman 0:0791c1fece8e 584 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
RodColeman 0:0791c1fece8e 585 /* Only insert an entry if the source IP address of the
RodColeman 0:0791c1fece8e 586 incoming IP packet comes from a host on the local network. */
RodColeman 0:0791c1fece8e 587 ethhdr = (struct eth_hdr *)p->payload;
RodColeman 0:0791c1fece8e 588 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
RodColeman 0:0791c1fece8e 589 #if ETHARP_SUPPORT_VLAN
RodColeman 0:0791c1fece8e 590 if (ethhdr->type == ETHTYPE_VLAN) {
RodColeman 0:0791c1fece8e 591 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
RodColeman 0:0791c1fece8e 592 }
RodColeman 0:0791c1fece8e 593 #endif /* ETHARP_SUPPORT_VLAN */
RodColeman 0:0791c1fece8e 594
RodColeman 0:0791c1fece8e 595 /* source is not on the local network? */
RodColeman 0:0791c1fece8e 596 if (!ip_addr_netcmp(&(iphdr->src), &(netif->ip_addr), &(netif->netmask))) {
RodColeman 0:0791c1fece8e 597 /* do nothing */
RodColeman 0:0791c1fece8e 598 return;
RodColeman 0:0791c1fece8e 599 }
RodColeman 0:0791c1fece8e 600
RodColeman 0:0791c1fece8e 601 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
RodColeman 0:0791c1fece8e 602 /* update ARP table */
RodColeman 0:0791c1fece8e 603 /* @todo We could use ETHARP_TRY_HARD if we think we are going to talk
RodColeman 0:0791c1fece8e 604 * back soon (for example, if the destination IP address is ours. */
RodColeman 0:0791c1fece8e 605 update_arp_entry(netif, &(iphdr->src), &(ethhdr->src), 0);
RodColeman 0:0791c1fece8e 606 }
RodColeman 0:0791c1fece8e 607
RodColeman 0:0791c1fece8e 608
RodColeman 0:0791c1fece8e 609 /**
RodColeman 0:0791c1fece8e 610 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
RodColeman 0:0791c1fece8e 611 * send out queued IP packets. Updates cache with snooped address pairs.
RodColeman 0:0791c1fece8e 612 *
RodColeman 0:0791c1fece8e 613 * Should be called for incoming ARP packets. The pbuf in the argument
RodColeman 0:0791c1fece8e 614 * is freed by this function.
RodColeman 0:0791c1fece8e 615 *
RodColeman 0:0791c1fece8e 616 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
RodColeman 0:0791c1fece8e 617 * @param ethaddr Ethernet address of netif.
RodColeman 0:0791c1fece8e 618 * @param p The ARP packet that arrived on netif. Is freed by this function.
RodColeman 0:0791c1fece8e 619 *
RodColeman 0:0791c1fece8e 620 * @return NULL
RodColeman 0:0791c1fece8e 621 *
RodColeman 0:0791c1fece8e 622 * @see pbuf_free()
RodColeman 0:0791c1fece8e 623 */
RodColeman 0:0791c1fece8e 624 void
RodColeman 0:0791c1fece8e 625 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
RodColeman 0:0791c1fece8e 626 {
RodColeman 0:0791c1fece8e 627 struct etharp_hdr *hdr;
RodColeman 0:0791c1fece8e 628 struct eth_hdr *ethhdr;
RodColeman 0:0791c1fece8e 629 /* these are aligned properly, whereas the ARP header fields might not be */
RodColeman 0:0791c1fece8e 630 struct ip_addr sipaddr, dipaddr;
RodColeman 0:0791c1fece8e 631 u8_t i;
RodColeman 0:0791c1fece8e 632 u8_t for_us;
RodColeman 0:0791c1fece8e 633 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 634 const u8_t * ethdst_hwaddr;
RodColeman 0:0791c1fece8e 635 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 636
RodColeman 0:0791c1fece8e 637 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
RodColeman 0:0791c1fece8e 638
RodColeman 0:0791c1fece8e 639 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
RodColeman 0:0791c1fece8e 640 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
RodColeman 0:0791c1fece8e 641 if (p->len < SIZEOF_ETHARP_PACKET) {
RodColeman 0:0791c1fece8e 642 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len, (s16_t)SIZEOF_ETHARP_PACKET));
RodColeman 0:0791c1fece8e 643 ETHARP_STATS_INC(etharp.lenerr);
RodColeman 0:0791c1fece8e 644 ETHARP_STATS_INC(etharp.drop);
RodColeman 0:0791c1fece8e 645 pbuf_free(p);
RodColeman 0:0791c1fece8e 646 return;
RodColeman 0:0791c1fece8e 647 }
RodColeman 0:0791c1fece8e 648
RodColeman 0:0791c1fece8e 649 ethhdr = (struct eth_hdr *)p->payload;
RodColeman 0:0791c1fece8e 650 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
RodColeman 0:0791c1fece8e 651 #if ETHARP_SUPPORT_VLAN
RodColeman 0:0791c1fece8e 652 if (ethhdr->type == ETHTYPE_VLAN) {
RodColeman 0:0791c1fece8e 653 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
RodColeman 0:0791c1fece8e 654 }
RodColeman 0:0791c1fece8e 655 #endif /* ETHARP_SUPPORT_VLAN */
RodColeman 0:0791c1fece8e 656
RodColeman 0:0791c1fece8e 657 /* RFC 826 "Packet Reception": */
RodColeman 0:0791c1fece8e 658 if ((hdr->hwtype != htons(HWTYPE_ETHERNET)) ||
RodColeman 0:0791c1fece8e 659 (hdr->_hwlen_protolen != htons((ETHARP_HWADDR_LEN << 8) | sizeof(struct ip_addr))) ||
RodColeman 0:0791c1fece8e 660 (hdr->proto != htons(ETHTYPE_IP)) ||
RodColeman 0:0791c1fece8e 661 (ethhdr->type != htons(ETHTYPE_ARP))) {
RodColeman 0:0791c1fece8e 662 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 1,
RodColeman 0:0791c1fece8e 663 ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
RodColeman 0:0791c1fece8e 664 hdr->hwtype, ARPH_HWLEN(hdr), hdr->proto, ARPH_PROTOLEN(hdr), ethhdr->type));
RodColeman 0:0791c1fece8e 665 ETHARP_STATS_INC(etharp.proterr);
RodColeman 0:0791c1fece8e 666 ETHARP_STATS_INC(etharp.drop);
RodColeman 0:0791c1fece8e 667 pbuf_free(p);
RodColeman 0:0791c1fece8e 668 return;
RodColeman 0:0791c1fece8e 669 }
RodColeman 0:0791c1fece8e 670 ETHARP_STATS_INC(etharp.recv);
RodColeman 0:0791c1fece8e 671
RodColeman 0:0791c1fece8e 672 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 673 /* We have to check if a host already has configured our random
RodColeman 0:0791c1fece8e 674 * created link local address and continously check if there is
RodColeman 0:0791c1fece8e 675 * a host with this IP-address so we can detect collisions */
RodColeman 0:0791c1fece8e 676 autoip_arp_reply(netif, hdr);
RodColeman 0:0791c1fece8e 677 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 678
RodColeman 0:0791c1fece8e 679 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
RodColeman 0:0791c1fece8e 680 * structure packing (not using structure copy which breaks strict-aliasing rules). */
RodColeman 0:0791c1fece8e 681 SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
RodColeman 0:0791c1fece8e 682 SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
RodColeman 0:0791c1fece8e 683
RodColeman 0:0791c1fece8e 684 /* this interface is not configured? */
RodColeman 0:0791c1fece8e 685 if (netif->ip_addr.addr == 0) {
RodColeman 0:0791c1fece8e 686 for_us = 0;
RodColeman 0:0791c1fece8e 687 } else {
RodColeman 0:0791c1fece8e 688 /* ARP packet directed to us? */
RodColeman 0:0791c1fece8e 689 for_us = ip_addr_cmp(&dipaddr, &(netif->ip_addr));
RodColeman 0:0791c1fece8e 690 }
RodColeman 0:0791c1fece8e 691
RodColeman 0:0791c1fece8e 692 /* ARP message directed to us? */
RodColeman 0:0791c1fece8e 693 if (for_us) {
RodColeman 0:0791c1fece8e 694 /* add IP address in ARP cache; assume requester wants to talk to us.
RodColeman 0:0791c1fece8e 695 * can result in directly sending the queued packets for this host. */
RodColeman 0:0791c1fece8e 696 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_TRY_HARD);
RodColeman 0:0791c1fece8e 697 /* ARP message not directed to us? */
RodColeman 0:0791c1fece8e 698 } else {
RodColeman 0:0791c1fece8e 699 /* update the source IP address in the cache, if present */
RodColeman 0:0791c1fece8e 700 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), 0);
RodColeman 0:0791c1fece8e 701 }
RodColeman 0:0791c1fece8e 702
RodColeman 0:0791c1fece8e 703 /* now act on the message itself */
RodColeman 0:0791c1fece8e 704 switch (htons(hdr->opcode)) {
RodColeman 0:0791c1fece8e 705 /* ARP request? */
RodColeman 0:0791c1fece8e 706 case ARP_REQUEST:
RodColeman 0:0791c1fece8e 707 /* ARP request. If it asked for our address, we send out a
RodColeman 0:0791c1fece8e 708 * reply. In any case, we time-stamp any existing ARP entry,
RodColeman 0:0791c1fece8e 709 * and possiby send out an IP packet that was queued on it. */
RodColeman 0:0791c1fece8e 710
RodColeman 0:0791c1fece8e 711 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
RodColeman 0:0791c1fece8e 712 /* ARP request for our address? */
RodColeman 0:0791c1fece8e 713 if (for_us) {
RodColeman 0:0791c1fece8e 714
RodColeman 0:0791c1fece8e 715 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
RodColeman 0:0791c1fece8e 716 /* Re-use pbuf to send ARP reply.
RodColeman 0:0791c1fece8e 717 Since we are re-using an existing pbuf, we can't call etharp_raw since
RodColeman 0:0791c1fece8e 718 that would allocate a new pbuf. */
RodColeman 0:0791c1fece8e 719 hdr->opcode = htons(ARP_REPLY);
RodColeman 0:0791c1fece8e 720
RodColeman 0:0791c1fece8e 721 hdr->dipaddr = hdr->sipaddr;
RodColeman 0:0791c1fece8e 722 SMEMCPY(&hdr->sipaddr, &netif->ip_addr, sizeof(hdr->sipaddr));
RodColeman 0:0791c1fece8e 723
RodColeman 0:0791c1fece8e 724 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
RodColeman 0:0791c1fece8e 725 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
RodColeman 0:0791c1fece8e 726 i = ETHARP_HWADDR_LEN;
RodColeman 0:0791c1fece8e 727 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 728 /* If we are using Link-Local, ARP packets must be broadcast on the
RodColeman 0:0791c1fece8e 729 * link layer. (See RFC3927 Section 2.5) */
RodColeman 0:0791c1fece8e 730 ethdst_hwaddr = ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
RodColeman 0:0791c1fece8e 731 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 732
RodColeman 0:0791c1fece8e 733 while(i > 0) {
RodColeman 0:0791c1fece8e 734 i--;
RodColeman 0:0791c1fece8e 735 hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
RodColeman 0:0791c1fece8e 736 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 737 ethhdr->dest.addr[i] = ethdst_hwaddr[i];
RodColeman 0:0791c1fece8e 738 #else /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 739 ethhdr->dest.addr[i] = hdr->shwaddr.addr[i];
RodColeman 0:0791c1fece8e 740 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 741 hdr->shwaddr.addr[i] = ethaddr->addr[i];
RodColeman 0:0791c1fece8e 742 ethhdr->src.addr[i] = ethaddr->addr[i];
RodColeman 0:0791c1fece8e 743 }
RodColeman 0:0791c1fece8e 744
RodColeman 0:0791c1fece8e 745 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
RodColeman 0:0791c1fece8e 746 are already correct, we tested that before */
RodColeman 0:0791c1fece8e 747
RodColeman 0:0791c1fece8e 748 /* return ARP reply */
RodColeman 0:0791c1fece8e 749 netif->linkoutput(netif, p);
RodColeman 0:0791c1fece8e 750 /* we are not configured? */
RodColeman 0:0791c1fece8e 751 } else if (netif->ip_addr.addr == 0) {
RodColeman 0:0791c1fece8e 752 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
RodColeman 0:0791c1fece8e 753 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
RodColeman 0:0791c1fece8e 754 /* request was not directed to us */
RodColeman 0:0791c1fece8e 755 } else {
RodColeman 0:0791c1fece8e 756 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
RodColeman 0:0791c1fece8e 757 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
RodColeman 0:0791c1fece8e 758 }
RodColeman 0:0791c1fece8e 759 break;
RodColeman 0:0791c1fece8e 760 case ARP_REPLY:
RodColeman 0:0791c1fece8e 761 /* ARP reply. We already updated the ARP cache earlier. */
RodColeman 0:0791c1fece8e 762 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
RodColeman 0:0791c1fece8e 763 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
RodColeman 0:0791c1fece8e 764 /* DHCP wants to know about ARP replies from any host with an
RodColeman 0:0791c1fece8e 765 * IP address also offered to us by the DHCP server. We do not
RodColeman 0:0791c1fece8e 766 * want to take a duplicate IP address on a single network.
RodColeman 0:0791c1fece8e 767 * @todo How should we handle redundant (fail-over) interfaces? */
RodColeman 0:0791c1fece8e 768 dhcp_arp_reply(netif, &sipaddr);
RodColeman 0:0791c1fece8e 769 #endif
RodColeman 0:0791c1fece8e 770 break;
RodColeman 0:0791c1fece8e 771 default:
RodColeman 0:0791c1fece8e 772 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
RodColeman 0:0791c1fece8e 773 ETHARP_STATS_INC(etharp.err);
RodColeman 0:0791c1fece8e 774 break;
RodColeman 0:0791c1fece8e 775 }
RodColeman 0:0791c1fece8e 776 /* free ARP packet */
RodColeman 0:0791c1fece8e 777 pbuf_free(p);
RodColeman 0:0791c1fece8e 778 }
RodColeman 0:0791c1fece8e 779
RodColeman 0:0791c1fece8e 780 /**
RodColeman 0:0791c1fece8e 781 * Resolve and fill-in Ethernet address header for outgoing IP packet.
RodColeman 0:0791c1fece8e 782 *
RodColeman 0:0791c1fece8e 783 * For IP multicast and broadcast, corresponding Ethernet addresses
RodColeman 0:0791c1fece8e 784 * are selected and the packet is transmitted on the link.
RodColeman 0:0791c1fece8e 785 *
RodColeman 0:0791c1fece8e 786 * For unicast addresses, the packet is submitted to etharp_query(). In
RodColeman 0:0791c1fece8e 787 * case the IP address is outside the local network, the IP address of
RodColeman 0:0791c1fece8e 788 * the gateway is used.
RodColeman 0:0791c1fece8e 789 *
RodColeman 0:0791c1fece8e 790 * @param netif The lwIP network interface which the IP packet will be sent on.
RodColeman 0:0791c1fece8e 791 * @param q The pbuf(s) containing the IP packet to be sent.
RodColeman 0:0791c1fece8e 792 * @param ipaddr The IP address of the packet destination.
RodColeman 0:0791c1fece8e 793 *
RodColeman 0:0791c1fece8e 794 * @return
RodColeman 0:0791c1fece8e 795 * - ERR_RTE No route to destination (no gateway to external networks),
RodColeman 0:0791c1fece8e 796 * or the return type of either etharp_query() or etharp_send_ip().
RodColeman 0:0791c1fece8e 797 */
RodColeman 0:0791c1fece8e 798 err_t
RodColeman 0:0791c1fece8e 799 etharp_output(struct netif *netif, struct pbuf *q, struct ip_addr *ipaddr)
RodColeman 0:0791c1fece8e 800 {
RodColeman 0:0791c1fece8e 801 struct eth_addr *dest, mcastaddr;
RodColeman 0:0791c1fece8e 802
RodColeman 0:0791c1fece8e 803 /* make room for Ethernet header - should not fail */
RodColeman 0:0791c1fece8e 804 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
RodColeman 0:0791c1fece8e 805 /* bail out */
RodColeman 0:0791c1fece8e 806 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 2, ("etharp_output: could not allocate room for header.\n"));
RodColeman 0:0791c1fece8e 807 LINK_STATS_INC(link.lenerr);
RodColeman 0:0791c1fece8e 808 return ERR_BUF;
RodColeman 0:0791c1fece8e 809 }
RodColeman 0:0791c1fece8e 810
RodColeman 0:0791c1fece8e 811 /* assume unresolved Ethernet address */
RodColeman 0:0791c1fece8e 812 dest = NULL;
RodColeman 0:0791c1fece8e 813 /* Determine on destination hardware address. Broadcasts and multicasts
RodColeman 0:0791c1fece8e 814 * are special, other IP addresses are looked up in the ARP table. */
RodColeman 0:0791c1fece8e 815
RodColeman 0:0791c1fece8e 816 /* broadcast destination IP address? */
RodColeman 0:0791c1fece8e 817 if (ip_addr_isbroadcast(ipaddr, netif)) {
RodColeman 0:0791c1fece8e 818 /* broadcast on Ethernet also */
RodColeman 0:0791c1fece8e 819 dest = (struct eth_addr *)&ethbroadcast;
RodColeman 0:0791c1fece8e 820 /* multicast destination IP address? */
RodColeman 0:0791c1fece8e 821 } else if (ip_addr_ismulticast(ipaddr)) {
RodColeman 0:0791c1fece8e 822 /* Hash IP multicast address to MAC address.*/
RodColeman 0:0791c1fece8e 823 mcastaddr.addr[0] = 0x01;
RodColeman 0:0791c1fece8e 824 mcastaddr.addr[1] = 0x00;
RodColeman 0:0791c1fece8e 825 mcastaddr.addr[2] = 0x5e;
RodColeman 0:0791c1fece8e 826 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
RodColeman 0:0791c1fece8e 827 mcastaddr.addr[4] = ip4_addr3(ipaddr);
RodColeman 0:0791c1fece8e 828 mcastaddr.addr[5] = ip4_addr4(ipaddr);
RodColeman 0:0791c1fece8e 829 /* destination Ethernet address is multicast */
RodColeman 0:0791c1fece8e 830 dest = &mcastaddr;
RodColeman 0:0791c1fece8e 831 /* unicast destination IP address? */
RodColeman 0:0791c1fece8e 832 } else {
RodColeman 0:0791c1fece8e 833 /* outside local network? */
RodColeman 0:0791c1fece8e 834 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask))) {
RodColeman 0:0791c1fece8e 835 /* interface has default gateway? */
RodColeman 0:0791c1fece8e 836 if (netif->gw.addr != 0) {
RodColeman 0:0791c1fece8e 837 /* send to hardware address of default gateway IP address */
RodColeman 0:0791c1fece8e 838 ipaddr = &(netif->gw);
RodColeman 0:0791c1fece8e 839 /* no default gateway available */
RodColeman 0:0791c1fece8e 840 } else {
RodColeman 0:0791c1fece8e 841 /* no route to destination error (default gateway missing) */
RodColeman 0:0791c1fece8e 842 return ERR_RTE;
RodColeman 0:0791c1fece8e 843 }
RodColeman 0:0791c1fece8e 844 }
RodColeman 0:0791c1fece8e 845 /* queue on destination Ethernet address belonging to ipaddr */
RodColeman 0:0791c1fece8e 846 return etharp_query(netif, ipaddr, q);
RodColeman 0:0791c1fece8e 847 }
RodColeman 0:0791c1fece8e 848
RodColeman 0:0791c1fece8e 849 /* continuation for multicast/broadcast destinations */
RodColeman 0:0791c1fece8e 850 /* obtain source Ethernet address of the given interface */
RodColeman 0:0791c1fece8e 851 /* send packet directly on the link */
RodColeman 0:0791c1fece8e 852 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
RodColeman 0:0791c1fece8e 853 }
RodColeman 0:0791c1fece8e 854
RodColeman 0:0791c1fece8e 855 /**
RodColeman 0:0791c1fece8e 856 * Send an ARP request for the given IP address and/or queue a packet.
RodColeman 0:0791c1fece8e 857 *
RodColeman 0:0791c1fece8e 858 * If the IP address was not yet in the cache, a pending ARP cache entry
RodColeman 0:0791c1fece8e 859 * is added and an ARP request is sent for the given address. The packet
RodColeman 0:0791c1fece8e 860 * is queued on this entry.
RodColeman 0:0791c1fece8e 861 *
RodColeman 0:0791c1fece8e 862 * If the IP address was already pending in the cache, a new ARP request
RodColeman 0:0791c1fece8e 863 * is sent for the given address. The packet is queued on this entry.
RodColeman 0:0791c1fece8e 864 *
RodColeman 0:0791c1fece8e 865 * If the IP address was already stable in the cache, and a packet is
RodColeman 0:0791c1fece8e 866 * given, it is directly sent and no ARP request is sent out.
RodColeman 0:0791c1fece8e 867 *
RodColeman 0:0791c1fece8e 868 * If the IP address was already stable in the cache, and no packet is
RodColeman 0:0791c1fece8e 869 * given, an ARP request is sent out.
RodColeman 0:0791c1fece8e 870 *
RodColeman 0:0791c1fece8e 871 * @param netif The lwIP network interface on which ipaddr
RodColeman 0:0791c1fece8e 872 * must be queried for.
RodColeman 0:0791c1fece8e 873 * @param ipaddr The IP address to be resolved.
RodColeman 0:0791c1fece8e 874 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
RodColeman 0:0791c1fece8e 875 * q is not freed by this function.
RodColeman 0:0791c1fece8e 876 *
RodColeman 0:0791c1fece8e 877 * @note q must only be ONE packet, not a packet queue!
RodColeman 0:0791c1fece8e 878 *
RodColeman 0:0791c1fece8e 879 * @return
RodColeman 0:0791c1fece8e 880 * - ERR_BUF Could not make room for Ethernet header.
RodColeman 0:0791c1fece8e 881 * - ERR_MEM Hardware address unknown, and no more ARP entries available
RodColeman 0:0791c1fece8e 882 * to query for address or queue the packet.
RodColeman 0:0791c1fece8e 883 * - ERR_MEM Could not queue packet due to memory shortage.
RodColeman 0:0791c1fece8e 884 * - ERR_RTE No route to destination (no gateway to external networks).
RodColeman 0:0791c1fece8e 885 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
RodColeman 0:0791c1fece8e 886 *
RodColeman 0:0791c1fece8e 887 */
RodColeman 0:0791c1fece8e 888 err_t
RodColeman 0:0791c1fece8e 889 etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
RodColeman 0:0791c1fece8e 890 {
RodColeman 0:0791c1fece8e 891 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
RodColeman 0:0791c1fece8e 892 err_t result = ERR_MEM;
RodColeman 0:0791c1fece8e 893 s8_t i; /* ARP entry index */
RodColeman 0:0791c1fece8e 894
RodColeman 0:0791c1fece8e 895 /* non-unicast address? */
RodColeman 0:0791c1fece8e 896 if (ip_addr_isbroadcast(ipaddr, netif) ||
RodColeman 0:0791c1fece8e 897 ip_addr_ismulticast(ipaddr) ||
RodColeman 0:0791c1fece8e 898 ip_addr_isany(ipaddr)) {
RodColeman 0:0791c1fece8e 899 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
RodColeman 0:0791c1fece8e 900 return ERR_ARG;
RodColeman 0:0791c1fece8e 901 }
RodColeman 0:0791c1fece8e 902
RodColeman 0:0791c1fece8e 903 /* find entry in ARP cache, ask to create entry if queueing packet */
RodColeman 0:0791c1fece8e 904 #if LWIP_NETIF_HWADDRHINT
RodColeman 0:0791c1fece8e 905 i = find_entry(ipaddr, ETHARP_TRY_HARD, netif);
RodColeman 0:0791c1fece8e 906 #else /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 907 i = find_entry(ipaddr, ETHARP_TRY_HARD);
RodColeman 0:0791c1fece8e 908 #endif /* LWIP_NETIF_HWADDRHINT */
RodColeman 0:0791c1fece8e 909
RodColeman 0:0791c1fece8e 910 /* could not find or create entry? */
RodColeman 0:0791c1fece8e 911 if (i < 0) {
RodColeman 0:0791c1fece8e 912 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
RodColeman 0:0791c1fece8e 913 if (q) {
RodColeman 0:0791c1fece8e 914 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
RodColeman 0:0791c1fece8e 915 ETHARP_STATS_INC(etharp.memerr);
RodColeman 0:0791c1fece8e 916 }
RodColeman 0:0791c1fece8e 917 return (err_t)i;
RodColeman 0:0791c1fece8e 918 }
RodColeman 0:0791c1fece8e 919
RodColeman 0:0791c1fece8e 920 /* mark a fresh entry as pending (we just sent a request) */
RodColeman 0:0791c1fece8e 921 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
RodColeman 0:0791c1fece8e 922 arp_table[i].state = ETHARP_STATE_PENDING;
RodColeman 0:0791c1fece8e 923 }
RodColeman 0:0791c1fece8e 924
RodColeman 0:0791c1fece8e 925 /* { i is either a STABLE or (new or existing) PENDING entry } */
RodColeman 0:0791c1fece8e 926 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
RodColeman 0:0791c1fece8e 927 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
RodColeman 0:0791c1fece8e 928 (arp_table[i].state == ETHARP_STATE_STABLE)));
RodColeman 0:0791c1fece8e 929
RodColeman 0:0791c1fece8e 930 /* do we have a pending entry? or an implicit query request? */
RodColeman 0:0791c1fece8e 931 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
RodColeman 0:0791c1fece8e 932 /* try to resolve it; send out ARP request */
RodColeman 0:0791c1fece8e 933 result = etharp_request(netif, ipaddr);
RodColeman 0:0791c1fece8e 934 if (result != ERR_OK) {
RodColeman 0:0791c1fece8e 935 /* ARP request couldn't be sent */
RodColeman 0:0791c1fece8e 936 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
RodColeman 0:0791c1fece8e 937 since this failure could be temporary, and the next packet calling
RodColeman 0:0791c1fece8e 938 etharp_query again could lead to sending the queued packets. */
RodColeman 0:0791c1fece8e 939 }
RodColeman 0:0791c1fece8e 940 }
RodColeman 0:0791c1fece8e 941
RodColeman 0:0791c1fece8e 942 /* packet given? */
RodColeman 0:0791c1fece8e 943 if (q != NULL) {
RodColeman 0:0791c1fece8e 944 /* stable entry? */
RodColeman 0:0791c1fece8e 945 if (arp_table[i].state == ETHARP_STATE_STABLE) {
RodColeman 0:0791c1fece8e 946 /* we have a valid IP->Ethernet address mapping */
RodColeman 0:0791c1fece8e 947 /* send the packet */
RodColeman 0:0791c1fece8e 948 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
RodColeman 0:0791c1fece8e 949 /* pending entry? (either just created or already pending */
RodColeman 0:0791c1fece8e 950 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
RodColeman 0:0791c1fece8e 951 #if ARP_QUEUEING /* queue the given q packet */
RodColeman 0:0791c1fece8e 952 struct pbuf *p;
RodColeman 0:0791c1fece8e 953 int copy_needed = 0;
RodColeman 0:0791c1fece8e 954 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
RodColeman 0:0791c1fece8e 955 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
RodColeman 0:0791c1fece8e 956 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
RodColeman 0:0791c1fece8e 957 p = q;
RodColeman 0:0791c1fece8e 958 while (p) {
RodColeman 0:0791c1fece8e 959 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
RodColeman 0:0791c1fece8e 960 if(p->type != PBUF_ROM) {
RodColeman 0:0791c1fece8e 961 copy_needed = 1;
RodColeman 0:0791c1fece8e 962 break;
RodColeman 0:0791c1fece8e 963 }
RodColeman 0:0791c1fece8e 964 p = p->next;
RodColeman 0:0791c1fece8e 965 }
RodColeman 0:0791c1fece8e 966 if(copy_needed) {
RodColeman 0:0791c1fece8e 967 /* copy the whole packet into new pbufs */
RodColeman 0:0791c1fece8e 968 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
RodColeman 0:0791c1fece8e 969 if(p != NULL) {
RodColeman 0:0791c1fece8e 970 if (pbuf_copy(p, q) != ERR_OK) {
RodColeman 0:0791c1fece8e 971 pbuf_free(p);
RodColeman 0:0791c1fece8e 972 p = NULL;
RodColeman 0:0791c1fece8e 973 }
RodColeman 0:0791c1fece8e 974 }
RodColeman 0:0791c1fece8e 975 } else {
RodColeman 0:0791c1fece8e 976 /* referencing the old pbuf is enough */
RodColeman 0:0791c1fece8e 977 p = q;
RodColeman 0:0791c1fece8e 978 pbuf_ref(p);
RodColeman 0:0791c1fece8e 979 }
RodColeman 0:0791c1fece8e 980 /* packet could be taken over? */
RodColeman 0:0791c1fece8e 981 if (p != NULL) {
RodColeman 0:0791c1fece8e 982 /* queue packet ... */
RodColeman 0:0791c1fece8e 983 struct etharp_q_entry *new_entry;
RodColeman 0:0791c1fece8e 984 /* allocate a new arp queue entry */
RodColeman 0:0791c1fece8e 985 new_entry = memp_malloc(MEMP_ARP_QUEUE);
RodColeman 0:0791c1fece8e 986 if (new_entry != NULL) {
RodColeman 0:0791c1fece8e 987 new_entry->next = 0;
RodColeman 0:0791c1fece8e 988 new_entry->p = p;
RodColeman 0:0791c1fece8e 989 if(arp_table[i].q != NULL) {
RodColeman 0:0791c1fece8e 990 /* queue was already existent, append the new entry to the end */
RodColeman 0:0791c1fece8e 991 struct etharp_q_entry *r;
RodColeman 0:0791c1fece8e 992 r = arp_table[i].q;
RodColeman 0:0791c1fece8e 993 while (r->next != NULL) {
RodColeman 0:0791c1fece8e 994 r = r->next;
RodColeman 0:0791c1fece8e 995 }
RodColeman 0:0791c1fece8e 996 r->next = new_entry;
RodColeman 0:0791c1fece8e 997 } else {
RodColeman 0:0791c1fece8e 998 /* queue did not exist, first item in queue */
RodColeman 0:0791c1fece8e 999 arp_table[i].q = new_entry;
RodColeman 0:0791c1fece8e 1000 }
RodColeman 0:0791c1fece8e 1001 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
RodColeman 0:0791c1fece8e 1002 result = ERR_OK;
RodColeman 0:0791c1fece8e 1003 } else {
RodColeman 0:0791c1fece8e 1004 /* the pool MEMP_ARP_QUEUE is empty */
RodColeman 0:0791c1fece8e 1005 pbuf_free(p);
RodColeman 0:0791c1fece8e 1006 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
RodColeman 0:0791c1fece8e 1007 /* { result == ERR_MEM } through initialization */
RodColeman 0:0791c1fece8e 1008 }
RodColeman 0:0791c1fece8e 1009 } else {
RodColeman 0:0791c1fece8e 1010 ETHARP_STATS_INC(etharp.memerr);
RodColeman 0:0791c1fece8e 1011 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
RodColeman 0:0791c1fece8e 1012 /* { result == ERR_MEM } through initialization */
RodColeman 0:0791c1fece8e 1013 }
RodColeman 0:0791c1fece8e 1014 #else /* ARP_QUEUEING == 0 */
RodColeman 0:0791c1fece8e 1015 /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
RodColeman 0:0791c1fece8e 1016 /* { result == ERR_MEM } through initialization */
RodColeman 0:0791c1fece8e 1017 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
RodColeman 0:0791c1fece8e 1018 #endif
RodColeman 0:0791c1fece8e 1019 }
RodColeman 0:0791c1fece8e 1020 }
RodColeman 0:0791c1fece8e 1021 return result;
RodColeman 0:0791c1fece8e 1022 }
RodColeman 0:0791c1fece8e 1023
RodColeman 0:0791c1fece8e 1024 /**
RodColeman 0:0791c1fece8e 1025 * Send a raw ARP packet (opcode and all addresses can be modified)
RodColeman 0:0791c1fece8e 1026 *
RodColeman 0:0791c1fece8e 1027 * @param netif the lwip network interface on which to send the ARP packet
RodColeman 0:0791c1fece8e 1028 * @param ethsrc_addr the source MAC address for the ethernet header
RodColeman 0:0791c1fece8e 1029 * @param ethdst_addr the destination MAC address for the ethernet header
RodColeman 0:0791c1fece8e 1030 * @param hwsrc_addr the source MAC address for the ARP protocol header
RodColeman 0:0791c1fece8e 1031 * @param ipsrc_addr the source IP address for the ARP protocol header
RodColeman 0:0791c1fece8e 1032 * @param hwdst_addr the destination MAC address for the ARP protocol header
RodColeman 0:0791c1fece8e 1033 * @param ipdst_addr the destination IP address for the ARP protocol header
RodColeman 0:0791c1fece8e 1034 * @param opcode the type of the ARP packet
RodColeman 0:0791c1fece8e 1035 * @return ERR_OK if the ARP packet has been sent
RodColeman 0:0791c1fece8e 1036 * ERR_MEM if the ARP packet couldn't be allocated
RodColeman 0:0791c1fece8e 1037 * any other err_t on failure
RodColeman 0:0791c1fece8e 1038 */
RodColeman 0:0791c1fece8e 1039 #if !LWIP_AUTOIP
RodColeman 0:0791c1fece8e 1040 static
RodColeman 0:0791c1fece8e 1041 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 1042 err_t
RodColeman 0:0791c1fece8e 1043 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
RodColeman 0:0791c1fece8e 1044 const struct eth_addr *ethdst_addr,
RodColeman 0:0791c1fece8e 1045 const struct eth_addr *hwsrc_addr, const struct ip_addr *ipsrc_addr,
RodColeman 0:0791c1fece8e 1046 const struct eth_addr *hwdst_addr, const struct ip_addr *ipdst_addr,
RodColeman 0:0791c1fece8e 1047 const u16_t opcode)
RodColeman 0:0791c1fece8e 1048 {
RodColeman 0:0791c1fece8e 1049 struct pbuf *p;
RodColeman 0:0791c1fece8e 1050 err_t result = ERR_OK;
RodColeman 0:0791c1fece8e 1051 u8_t k; /* ARP entry index */
RodColeman 0:0791c1fece8e 1052 struct eth_hdr *ethhdr;
RodColeman 0:0791c1fece8e 1053 struct etharp_hdr *hdr;
RodColeman 0:0791c1fece8e 1054 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 1055 const u8_t * ethdst_hwaddr;
RodColeman 0:0791c1fece8e 1056 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 1057
RodColeman 0:0791c1fece8e 1058 /* allocate a pbuf for the outgoing ARP request packet */
RodColeman 0:0791c1fece8e 1059 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
RodColeman 0:0791c1fece8e 1060 /* could allocate a pbuf for an ARP request? */
RodColeman 0:0791c1fece8e 1061 if (p == NULL) {
RodColeman 0:0791c1fece8e 1062 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 2, ("etharp_raw: could not allocate pbuf for ARP request.\n"));
RodColeman 0:0791c1fece8e 1063 ETHARP_STATS_INC(etharp.memerr);
RodColeman 0:0791c1fece8e 1064 return ERR_MEM;
RodColeman 0:0791c1fece8e 1065 }
RodColeman 0:0791c1fece8e 1066 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
RodColeman 0:0791c1fece8e 1067 (p->len >= SIZEOF_ETHARP_PACKET));
RodColeman 0:0791c1fece8e 1068
RodColeman 0:0791c1fece8e 1069 ethhdr = (struct eth_hdr *)p->payload;
RodColeman 0:0791c1fece8e 1070 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
RodColeman 0:0791c1fece8e 1071 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
RodColeman 0:0791c1fece8e 1072 hdr->opcode = htons(opcode);
RodColeman 0:0791c1fece8e 1073
RodColeman 0:0791c1fece8e 1074 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
RodColeman 0:0791c1fece8e 1075 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
RodColeman 0:0791c1fece8e 1076 k = ETHARP_HWADDR_LEN;
RodColeman 0:0791c1fece8e 1077 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 1078 /* If we are using Link-Local, ARP packets must be broadcast on the
RodColeman 0:0791c1fece8e 1079 * link layer. (See RFC3927 Section 2.5) */
RodColeman 0:0791c1fece8e 1080 ethdst_hwaddr = ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
RodColeman 0:0791c1fece8e 1081 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 1082 /* Write MAC-Addresses (combined loop for both headers) */
RodColeman 0:0791c1fece8e 1083 while(k > 0) {
RodColeman 0:0791c1fece8e 1084 k--;
RodColeman 0:0791c1fece8e 1085 /* Write the ARP MAC-Addresses */
RodColeman 0:0791c1fece8e 1086 hdr->shwaddr.addr[k] = hwsrc_addr->addr[k];
RodColeman 0:0791c1fece8e 1087 hdr->dhwaddr.addr[k] = hwdst_addr->addr[k];
RodColeman 0:0791c1fece8e 1088 /* Write the Ethernet MAC-Addresses */
RodColeman 0:0791c1fece8e 1089 #if LWIP_AUTOIP
RodColeman 0:0791c1fece8e 1090 ethhdr->dest.addr[k] = ethdst_hwaddr[k];
RodColeman 0:0791c1fece8e 1091 #else /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 1092 ethhdr->dest.addr[k] = ethdst_addr->addr[k];
RodColeman 0:0791c1fece8e 1093 #endif /* LWIP_AUTOIP */
RodColeman 0:0791c1fece8e 1094 ethhdr->src.addr[k] = ethsrc_addr->addr[k];
RodColeman 0:0791c1fece8e 1095 }
RodColeman 0:0791c1fece8e 1096 hdr->sipaddr = *(struct ip_addr2 *)ipsrc_addr;
RodColeman 0:0791c1fece8e 1097 hdr->dipaddr = *(struct ip_addr2 *)ipdst_addr;
RodColeman 0:0791c1fece8e 1098
RodColeman 0:0791c1fece8e 1099 hdr->hwtype = htons(HWTYPE_ETHERNET);
RodColeman 0:0791c1fece8e 1100 hdr->proto = htons(ETHTYPE_IP);
RodColeman 0:0791c1fece8e 1101 /* set hwlen and protolen together */
RodColeman 0:0791c1fece8e 1102 hdr->_hwlen_protolen = htons((ETHARP_HWADDR_LEN << 8) | sizeof(struct ip_addr));
RodColeman 0:0791c1fece8e 1103
RodColeman 0:0791c1fece8e 1104 ethhdr->type = htons(ETHTYPE_ARP);
RodColeman 0:0791c1fece8e 1105 /* send ARP query */
RodColeman 0:0791c1fece8e 1106 result = netif->linkoutput(netif, p);
RodColeman 0:0791c1fece8e 1107 ETHARP_STATS_INC(etharp.xmit);
RodColeman 0:0791c1fece8e 1108 /* free ARP query packet */
RodColeman 0:0791c1fece8e 1109 pbuf_free(p);
RodColeman 0:0791c1fece8e 1110 p = NULL;
RodColeman 0:0791c1fece8e 1111 /* could not allocate pbuf for ARP request */
RodColeman 0:0791c1fece8e 1112
RodColeman 0:0791c1fece8e 1113 return result;
RodColeman 0:0791c1fece8e 1114 }
RodColeman 0:0791c1fece8e 1115
RodColeman 0:0791c1fece8e 1116 /**
RodColeman 0:0791c1fece8e 1117 * Send an ARP request packet asking for ipaddr.
RodColeman 0:0791c1fece8e 1118 *
RodColeman 0:0791c1fece8e 1119 * @param netif the lwip network interface on which to send the request
RodColeman 0:0791c1fece8e 1120 * @param ipaddr the IP address for which to ask
RodColeman 0:0791c1fece8e 1121 * @return ERR_OK if the request has been sent
RodColeman 0:0791c1fece8e 1122 * ERR_MEM if the ARP packet couldn't be allocated
RodColeman 0:0791c1fece8e 1123 * any other err_t on failure
RodColeman 0:0791c1fece8e 1124 */
RodColeman 0:0791c1fece8e 1125 err_t
RodColeman 0:0791c1fece8e 1126 etharp_request(struct netif *netif, struct ip_addr *ipaddr)
RodColeman 0:0791c1fece8e 1127 {
RodColeman 0:0791c1fece8e 1128 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
RodColeman 0:0791c1fece8e 1129 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
RodColeman 0:0791c1fece8e 1130 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
RodColeman 0:0791c1fece8e 1131 ipaddr, ARP_REQUEST);
RodColeman 0:0791c1fece8e 1132 }
RodColeman 0:0791c1fece8e 1133
RodColeman 0:0791c1fece8e 1134 /**
RodColeman 0:0791c1fece8e 1135 * Process received ethernet frames. Using this function instead of directly
RodColeman 0:0791c1fece8e 1136 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
RodColeman 0:0791c1fece8e 1137 * the ARP cache is protected from concurrent access.
RodColeman 0:0791c1fece8e 1138 *
RodColeman 0:0791c1fece8e 1139 * @param p the recevied packet, p->payload pointing to the ethernet header
RodColeman 0:0791c1fece8e 1140 * @param netif the network interface on which the packet was received
RodColeman 0:0791c1fece8e 1141 */
RodColeman 0:0791c1fece8e 1142 err_t
RodColeman 0:0791c1fece8e 1143 ethernet_input(struct pbuf *p, struct netif *netif)
RodColeman 0:0791c1fece8e 1144 {
RodColeman 0:0791c1fece8e 1145 struct eth_hdr* ethhdr;
RodColeman 0:0791c1fece8e 1146 u16_t type;
RodColeman 0:0791c1fece8e 1147
RodColeman 0:0791c1fece8e 1148 /* points to packet payload, which starts with an Ethernet header */
RodColeman 0:0791c1fece8e 1149 ethhdr = (struct eth_hdr *)p->payload;
RodColeman 0:0791c1fece8e 1150 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
RodColeman 0:0791c1fece8e 1151 ("ethernet_input: dest:%02x:%02x:%02x:%02x:%02x:%02x, src:%02x:%02x:%02x:%02x:%02x:%02x, type:%2hx\n",
RodColeman 0:0791c1fece8e 1152 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
RodColeman 0:0791c1fece8e 1153 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
RodColeman 0:0791c1fece8e 1154 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
RodColeman 0:0791c1fece8e 1155 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
RodColeman 0:0791c1fece8e 1156 (unsigned)htons(ethhdr->type)));
RodColeman 0:0791c1fece8e 1157
RodColeman 0:0791c1fece8e 1158 type = htons(ethhdr->type);
RodColeman 0:0791c1fece8e 1159 #if ETHARP_SUPPORT_VLAN
RodColeman 0:0791c1fece8e 1160 if (type == ETHTYPE_VLAN) {
RodColeman 0:0791c1fece8e 1161 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
RodColeman 0:0791c1fece8e 1162 #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
RodColeman 0:0791c1fece8e 1163 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
RodColeman 0:0791c1fece8e 1164 /* silently ignore this packet: not for our VLAN */
RodColeman 0:0791c1fece8e 1165 pbuf_free(p);
RodColeman 0:0791c1fece8e 1166 return ERR_OK;
RodColeman 0:0791c1fece8e 1167 }
RodColeman 0:0791c1fece8e 1168 #endif /* ETHARP_VLAN_CHECK */
RodColeman 0:0791c1fece8e 1169 type = htons(vlan->tpid);
RodColeman 0:0791c1fece8e 1170 }
RodColeman 0:0791c1fece8e 1171 #endif /* ETHARP_SUPPORT_VLAN */
RodColeman 0:0791c1fece8e 1172
RodColeman 0:0791c1fece8e 1173 switch (type) {
RodColeman 0:0791c1fece8e 1174 /* IP packet? */
RodColeman 0:0791c1fece8e 1175 case ETHTYPE_IP:
RodColeman 0:0791c1fece8e 1176 #if ETHARP_TRUST_IP_MAC
RodColeman 0:0791c1fece8e 1177 /* update ARP table */
RodColeman 0:0791c1fece8e 1178 etharp_ip_input(netif, p);
RodColeman 0:0791c1fece8e 1179 #endif /* ETHARP_TRUST_IP_MAC */
RodColeman 0:0791c1fece8e 1180 /* skip Ethernet header */
RodColeman 0:0791c1fece8e 1181 if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
RodColeman 0:0791c1fece8e 1182 LWIP_ASSERT("Can't move over header in packet", 0);
RodColeman 0:0791c1fece8e 1183 pbuf_free(p);
RodColeman 0:0791c1fece8e 1184 p = NULL;
RodColeman 0:0791c1fece8e 1185 } else {
RodColeman 0:0791c1fece8e 1186 /* pass to IP layer */
RodColeman 0:0791c1fece8e 1187 ip_input(p, netif);
RodColeman 0:0791c1fece8e 1188 }
RodColeman 0:0791c1fece8e 1189 break;
RodColeman 0:0791c1fece8e 1190
RodColeman 0:0791c1fece8e 1191 case ETHTYPE_ARP:
RodColeman 0:0791c1fece8e 1192 /* pass p to ARP module */
RodColeman 0:0791c1fece8e 1193 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
RodColeman 0:0791c1fece8e 1194 break;
RodColeman 0:0791c1fece8e 1195
RodColeman 0:0791c1fece8e 1196 #if PPPOE_SUPPORT
RodColeman 0:0791c1fece8e 1197 case ETHTYPE_PPPOEDISC: /* PPP Over Ethernet Discovery Stage */
RodColeman 0:0791c1fece8e 1198 pppoe_disc_input(netif, p);
RodColeman 0:0791c1fece8e 1199 break;
RodColeman 0:0791c1fece8e 1200
RodColeman 0:0791c1fece8e 1201 case ETHTYPE_PPPOE: /* PPP Over Ethernet Session Stage */
RodColeman 0:0791c1fece8e 1202 pppoe_data_input(netif, p);
RodColeman 0:0791c1fece8e 1203 break;
RodColeman 0:0791c1fece8e 1204 #endif /* PPPOE_SUPPORT */
RodColeman 0:0791c1fece8e 1205
RodColeman 0:0791c1fece8e 1206 default:
RodColeman 0:0791c1fece8e 1207 ETHARP_STATS_INC(etharp.proterr);
RodColeman 0:0791c1fece8e 1208 ETHARP_STATS_INC(etharp.drop);
RodColeman 0:0791c1fece8e 1209 pbuf_free(p);
RodColeman 0:0791c1fece8e 1210 p = NULL;
RodColeman 0:0791c1fece8e 1211 break;
RodColeman 0:0791c1fece8e 1212 }
RodColeman 0:0791c1fece8e 1213
RodColeman 0:0791c1fece8e 1214 /* This means the pbuf is freed or consumed,
RodColeman 0:0791c1fece8e 1215 so the caller doesn't have to free it again */
RodColeman 0:0791c1fece8e 1216 return ERR_OK;
RodColeman 0:0791c1fece8e 1217 }
RodColeman 0:0791c1fece8e 1218 #endif /* LWIP_ARP */