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Dependencies:   F7_Ethernet WebSocketClient mbed mcp3008

Fork of Nucleo_F746ZG_Ethernet by Dieter Graef

F7_Ethernet/lwip/netif/etharp.c@0:f9b6112278fe, 2016-06-18 (annotated)

Committer:
DieterGraef
Date:
Sat Jun 18 10:49:12 2016 +0000
Revision:
0:f9b6112278fe
Ethernet for the NUCLEO STM32F746 Board Testprogram uses DHCP and NTP to set the clock

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:f9b6112278fe 1 /**
DieterGraef 0:f9b6112278fe 2 * @file
DieterGraef 0:f9b6112278fe 3 * Address Resolution Protocol module for IP over Ethernet
DieterGraef 0:f9b6112278fe 4 *
DieterGraef 0:f9b6112278fe 5 * Functionally, ARP is divided into two parts. The first maps an IP address
DieterGraef 0:f9b6112278fe 6 * to a physical address when sending a packet, and the second part answers
DieterGraef 0:f9b6112278fe 7 * requests from other machines for our physical address.
DieterGraef 0:f9b6112278fe 8 *
DieterGraef 0:f9b6112278fe 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
DieterGraef 0:f9b6112278fe 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
DieterGraef 0:f9b6112278fe 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
DieterGraef 0:f9b6112278fe 12 */
DieterGraef 0:f9b6112278fe 13
DieterGraef 0:f9b6112278fe 14 /*
DieterGraef 0:f9b6112278fe 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
DieterGraef 0:f9b6112278fe 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
DieterGraef 0:f9b6112278fe 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
DieterGraef 0:f9b6112278fe 18 * All rights reserved.
DieterGraef 0:f9b6112278fe 19 *
DieterGraef 0:f9b6112278fe 20 * Redistribution and use in source and binary forms, with or without modification,
DieterGraef 0:f9b6112278fe 21 * are permitted provided that the following conditions are met:
DieterGraef 0:f9b6112278fe 22 *
DieterGraef 0:f9b6112278fe 23 * 1. Redistributions of source code must retain the above copyright notice,
DieterGraef 0:f9b6112278fe 24 * this list of conditions and the following disclaimer.
DieterGraef 0:f9b6112278fe 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
DieterGraef 0:f9b6112278fe 26 * this list of conditions and the following disclaimer in the documentation
DieterGraef 0:f9b6112278fe 27 * and/or other materials provided with the distribution.
DieterGraef 0:f9b6112278fe 28 * 3. The name of the author may not be used to endorse or promote products
DieterGraef 0:f9b6112278fe 29 * derived from this software without specific prior written permission.
DieterGraef 0:f9b6112278fe 30 *
DieterGraef 0:f9b6112278fe 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
DieterGraef 0:f9b6112278fe 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
DieterGraef 0:f9b6112278fe 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
DieterGraef 0:f9b6112278fe 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
DieterGraef 0:f9b6112278fe 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
DieterGraef 0:f9b6112278fe 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:f9b6112278fe 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:f9b6112278fe 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
DieterGraef 0:f9b6112278fe 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
DieterGraef 0:f9b6112278fe 40 * OF SUCH DAMAGE.
DieterGraef 0:f9b6112278fe 41 *
DieterGraef 0:f9b6112278fe 42 * This file is part of the lwIP TCP/IP stack.
DieterGraef 0:f9b6112278fe 43 *
DieterGraef 0:f9b6112278fe 44 */
DieterGraef 0:f9b6112278fe 45
DieterGraef 0:f9b6112278fe 46 #include "lwip/opt.h"
DieterGraef 0:f9b6112278fe 47
DieterGraef 0:f9b6112278fe 48 #if LWIP_ARP || LWIP_ETHERNET
DieterGraef 0:f9b6112278fe 49
DieterGraef 0:f9b6112278fe 50 #include "lwip/ip_addr.h"
DieterGraef 0:f9b6112278fe 51 #include "lwip/def.h"
DieterGraef 0:f9b6112278fe 52 #include "lwip/ip.h"
DieterGraef 0:f9b6112278fe 53 #include "lwip/stats.h"
DieterGraef 0:f9b6112278fe 54 #include "lwip/snmp.h"
DieterGraef 0:f9b6112278fe 55 #include "lwip/dhcp.h"
DieterGraef 0:f9b6112278fe 56 #include "lwip/autoip.h"
DieterGraef 0:f9b6112278fe 57 #include "netif/etharp.h"
DieterGraef 0:f9b6112278fe 58
DieterGraef 0:f9b6112278fe 59 #if PPPOE_SUPPORT
DieterGraef 0:f9b6112278fe 60 #include "netif/ppp_oe.h"
DieterGraef 0:f9b6112278fe 61 #endif /* PPPOE_SUPPORT */
DieterGraef 0:f9b6112278fe 62
DieterGraef 0:f9b6112278fe 63 #include <string.h>
DieterGraef 0:f9b6112278fe 64
DieterGraef 0:f9b6112278fe 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
DieterGraef 0:f9b6112278fe 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
DieterGraef 0:f9b6112278fe 67
DieterGraef 0:f9b6112278fe 68 /** The 24-bit IANA multicast OUI is 01-00-5e: */
DieterGraef 0:f9b6112278fe 69 #define LL_MULTICAST_ADDR_0 0x01
DieterGraef 0:f9b6112278fe 70 #define LL_MULTICAST_ADDR_1 0x00
DieterGraef 0:f9b6112278fe 71 #define LL_MULTICAST_ADDR_2 0x5e
DieterGraef 0:f9b6112278fe 72
DieterGraef 0:f9b6112278fe 73 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
DieterGraef 0:f9b6112278fe 74
DieterGraef 0:f9b6112278fe 75 /** the time an ARP entry stays valid after its last update,
DieterGraef 0:f9b6112278fe 76 * for ARP_TMR_INTERVAL = 5000, this is
DieterGraef 0:f9b6112278fe 77 * (240 * 5) seconds = 20 minutes.
DieterGraef 0:f9b6112278fe 78 */
DieterGraef 0:f9b6112278fe 79 #define ARP_MAXAGE 240
DieterGraef 0:f9b6112278fe 80 /** Re-request a used ARP entry 1 minute before it would expire to prevent
DieterGraef 0:f9b6112278fe 81 * breaking a steadily used connection because the ARP entry timed out. */
DieterGraef 0:f9b6112278fe 82 #define ARP_AGE_REREQUEST_USED (ARP_MAXAGE - 12)
DieterGraef 0:f9b6112278fe 83
DieterGraef 0:f9b6112278fe 84 /** the time an ARP entry stays pending after first request,
DieterGraef 0:f9b6112278fe 85 * for ARP_TMR_INTERVAL = 5000, this is
DieterGraef 0:f9b6112278fe 86 * (2 * 5) seconds = 10 seconds.
DieterGraef 0:f9b6112278fe 87 *
DieterGraef 0:f9b6112278fe 88 * @internal Keep this number at least 2, otherwise it might
DieterGraef 0:f9b6112278fe 89 * run out instantly if the timeout occurs directly after a request.
DieterGraef 0:f9b6112278fe 90 */
DieterGraef 0:f9b6112278fe 91 #define ARP_MAXPENDING 2
DieterGraef 0:f9b6112278fe 92
DieterGraef 0:f9b6112278fe 93 #define HWTYPE_ETHERNET 1
DieterGraef 0:f9b6112278fe 94
DieterGraef 0:f9b6112278fe 95 enum etharp_state {
DieterGraef 0:f9b6112278fe 96 ETHARP_STATE_EMPTY = 0,
DieterGraef 0:f9b6112278fe 97 ETHARP_STATE_PENDING,
DieterGraef 0:f9b6112278fe 98 ETHARP_STATE_STABLE,
DieterGraef 0:f9b6112278fe 99 ETHARP_STATE_STABLE_REREQUESTING
DieterGraef 0:f9b6112278fe 100 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:f9b6112278fe 101 ,ETHARP_STATE_STATIC
DieterGraef 0:f9b6112278fe 102 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:f9b6112278fe 103 };
DieterGraef 0:f9b6112278fe 104
DieterGraef 0:f9b6112278fe 105 struct etharp_entry {
DieterGraef 0:f9b6112278fe 106 #if ARP_QUEUEING
DieterGraef 0:f9b6112278fe 107 /** Pointer to queue of pending outgoing packets on this ARP entry. */
DieterGraef 0:f9b6112278fe 108 struct etharp_q_entry *q;
DieterGraef 0:f9b6112278fe 109 #else /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 110 /** Pointer to a single pending outgoing packet on this ARP entry. */
DieterGraef 0:f9b6112278fe 111 struct pbuf *q;
DieterGraef 0:f9b6112278fe 112 #endif /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 113 ip_addr_t ipaddr;
DieterGraef 0:f9b6112278fe 114 struct netif *netif;
DieterGraef 0:f9b6112278fe 115 struct eth_addr ethaddr;
DieterGraef 0:f9b6112278fe 116 u8_t state;
DieterGraef 0:f9b6112278fe 117 u8_t ctime;
DieterGraef 0:f9b6112278fe 118 };
DieterGraef 0:f9b6112278fe 119
DieterGraef 0:f9b6112278fe 120 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
DieterGraef 0:f9b6112278fe 121
DieterGraef 0:f9b6112278fe 122 #if !LWIP_NETIF_HWADDRHINT
DieterGraef 0:f9b6112278fe 123 static u8_t etharp_cached_entry;
DieterGraef 0:f9b6112278fe 124 #endif /* !LWIP_NETIF_HWADDRHINT */
DieterGraef 0:f9b6112278fe 125
DieterGraef 0:f9b6112278fe 126 /** Try hard to create a new entry - we want the IP address to appear in
DieterGraef 0:f9b6112278fe 127 the cache (even if this means removing an active entry or so). */
DieterGraef 0:f9b6112278fe 128 #define ETHARP_FLAG_TRY_HARD 1
DieterGraef 0:f9b6112278fe 129 #define ETHARP_FLAG_FIND_ONLY 2
DieterGraef 0:f9b6112278fe 130 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:f9b6112278fe 131 #define ETHARP_FLAG_STATIC_ENTRY 4
DieterGraef 0:f9b6112278fe 132 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:f9b6112278fe 133
DieterGraef 0:f9b6112278fe 134 #if LWIP_NETIF_HWADDRHINT
DieterGraef 0:f9b6112278fe 135 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
DieterGraef 0:f9b6112278fe 136 *((netif)->addr_hint) = (hint);
DieterGraef 0:f9b6112278fe 137 #else /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:f9b6112278fe 138 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
DieterGraef 0:f9b6112278fe 139 #endif /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:f9b6112278fe 140
DieterGraef 0:f9b6112278fe 141
DieterGraef 0:f9b6112278fe 142 /* Some checks, instead of etharp_init(): */
DieterGraef 0:f9b6112278fe 143 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
DieterGraef 0:f9b6112278fe 144 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
DieterGraef 0:f9b6112278fe 145 #endif
DieterGraef 0:f9b6112278fe 146
DieterGraef 0:f9b6112278fe 147
DieterGraef 0:f9b6112278fe 148 #if ARP_QUEUEING
DieterGraef 0:f9b6112278fe 149 /**
DieterGraef 0:f9b6112278fe 150 * Free a complete queue of etharp entries
DieterGraef 0:f9b6112278fe 151 *
DieterGraef 0:f9b6112278fe 152 * @param q a qeueue of etharp_q_entry's to free
DieterGraef 0:f9b6112278fe 153 */
DieterGraef 0:f9b6112278fe 154 static void
DieterGraef 0:f9b6112278fe 155 free_etharp_q(struct etharp_q_entry *q)
DieterGraef 0:f9b6112278fe 156 {
DieterGraef 0:f9b6112278fe 157 struct etharp_q_entry *r;
DieterGraef 0:f9b6112278fe 158 LWIP_ASSERT("q != NULL", q != NULL);
DieterGraef 0:f9b6112278fe 159 LWIP_ASSERT("q->p != NULL", q->p != NULL);
DieterGraef 0:f9b6112278fe 160 while (q) {
DieterGraef 0:f9b6112278fe 161 r = q;
DieterGraef 0:f9b6112278fe 162 q = q->next;
DieterGraef 0:f9b6112278fe 163 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
DieterGraef 0:f9b6112278fe 164 pbuf_free(r->p);
DieterGraef 0:f9b6112278fe 165 memp_free(MEMP_ARP_QUEUE, r);
DieterGraef 0:f9b6112278fe 166 }
DieterGraef 0:f9b6112278fe 167 }
DieterGraef 0:f9b6112278fe 168 #else /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 169
DieterGraef 0:f9b6112278fe 170 /** Compatibility define: free the queued pbuf */
DieterGraef 0:f9b6112278fe 171 #define free_etharp_q(q) pbuf_free(q)
DieterGraef 0:f9b6112278fe 172
DieterGraef 0:f9b6112278fe 173 #endif /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 174
DieterGraef 0:f9b6112278fe 175 /** Clean up ARP table entries */
DieterGraef 0:f9b6112278fe 176 static void
DieterGraef 0:f9b6112278fe 177 etharp_free_entry(int i)
DieterGraef 0:f9b6112278fe 178 {
DieterGraef 0:f9b6112278fe 179 /* remove from SNMP ARP index tree */
DieterGraef 0:f9b6112278fe 180 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
DieterGraef 0:f9b6112278fe 181 /* and empty packet queue */
DieterGraef 0:f9b6112278fe 182 if (arp_table[i].q != NULL) {
DieterGraef 0:f9b6112278fe 183 /* remove all queued packets */
DieterGraef 0:f9b6112278fe 184 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_free_entry: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
DieterGraef 0:f9b6112278fe 185 free_etharp_q(arp_table[i].q);
DieterGraef 0:f9b6112278fe 186 arp_table[i].q = NULL;
DieterGraef 0:f9b6112278fe 187 }
DieterGraef 0:f9b6112278fe 188 /* recycle entry for re-use */
DieterGraef 0:f9b6112278fe 189 arp_table[i].state = ETHARP_STATE_EMPTY;
DieterGraef 0:f9b6112278fe 190 #ifdef LWIP_DEBUG
DieterGraef 0:f9b6112278fe 191 /* for debugging, clean out the complete entry */
DieterGraef 0:f9b6112278fe 192 arp_table[i].ctime = 0;
DieterGraef 0:f9b6112278fe 193 arp_table[i].netif = NULL;
DieterGraef 0:f9b6112278fe 194 ip_addr_set_zero(&arp_table[i].ipaddr);
DieterGraef 0:f9b6112278fe 195 arp_table[i].ethaddr = ethzero;
DieterGraef 0:f9b6112278fe 196 #endif /* LWIP_DEBUG */
DieterGraef 0:f9b6112278fe 197 }
DieterGraef 0:f9b6112278fe 198
DieterGraef 0:f9b6112278fe 199 /**
DieterGraef 0:f9b6112278fe 200 * Clears expired entries in the ARP table.
DieterGraef 0:f9b6112278fe 201 *
DieterGraef 0:f9b6112278fe 202 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
DieterGraef 0:f9b6112278fe 203 * in order to expire entries in the ARP table.
DieterGraef 0:f9b6112278fe 204 */
DieterGraef 0:f9b6112278fe 205 void
DieterGraef 0:f9b6112278fe 206 etharp_tmr(void)
DieterGraef 0:f9b6112278fe 207 {
DieterGraef 0:f9b6112278fe 208 u8_t i;
DieterGraef 0:f9b6112278fe 209
DieterGraef 0:f9b6112278fe 210 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
DieterGraef 0:f9b6112278fe 211 /* remove expired entries from the ARP table */
DieterGraef 0:f9b6112278fe 212 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
DieterGraef 0:f9b6112278fe 213 u8_t state = arp_table[i].state;
DieterGraef 0:f9b6112278fe 214 if (state != ETHARP_STATE_EMPTY
DieterGraef 0:f9b6112278fe 215 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:f9b6112278fe 216 && (state != ETHARP_STATE_STATIC)
DieterGraef 0:f9b6112278fe 217 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:f9b6112278fe 218 ) {
DieterGraef 0:f9b6112278fe 219 arp_table[i].ctime++;
DieterGraef 0:f9b6112278fe 220 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
DieterGraef 0:f9b6112278fe 221 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
DieterGraef 0:f9b6112278fe 222 (arp_table[i].ctime >= ARP_MAXPENDING))) {
DieterGraef 0:f9b6112278fe 223 /* pending or stable entry has become old! */
DieterGraef 0:f9b6112278fe 224 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
DieterGraef 0:f9b6112278fe 225 arp_table[i].state >= ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
DieterGraef 0:f9b6112278fe 226 /* clean up entries that have just been expired */
DieterGraef 0:f9b6112278fe 227 etharp_free_entry(i);
DieterGraef 0:f9b6112278fe 228 }
DieterGraef 0:f9b6112278fe 229 else if (arp_table[i].state == ETHARP_STATE_STABLE_REREQUESTING) {
DieterGraef 0:f9b6112278fe 230 /* Reset state to stable, so that the next transmitted packet will
DieterGraef 0:f9b6112278fe 231 re-send an ARP request. */
DieterGraef 0:f9b6112278fe 232 arp_table[i].state = ETHARP_STATE_STABLE;
DieterGraef 0:f9b6112278fe 233 }
DieterGraef 0:f9b6112278fe 234 #if ARP_QUEUEING
DieterGraef 0:f9b6112278fe 235 /* still pending entry? (not expired) */
DieterGraef 0:f9b6112278fe 236 if (arp_table[i].state == ETHARP_STATE_PENDING) {
DieterGraef 0:f9b6112278fe 237 /* resend an ARP query here? */
DieterGraef 0:f9b6112278fe 238 }
DieterGraef 0:f9b6112278fe 239 #endif /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 240 }
DieterGraef 0:f9b6112278fe 241 }
DieterGraef 0:f9b6112278fe 242 }
DieterGraef 0:f9b6112278fe 243
DieterGraef 0:f9b6112278fe 244 /**
DieterGraef 0:f9b6112278fe 245 * Search the ARP table for a matching or new entry.
DieterGraef 0:f9b6112278fe 246 *
DieterGraef 0:f9b6112278fe 247 * If an IP address is given, return a pending or stable ARP entry that matches
DieterGraef 0:f9b6112278fe 248 * the address. If no match is found, create a new entry with this address set,
DieterGraef 0:f9b6112278fe 249 * but in state ETHARP_EMPTY. The caller must check and possibly change the
DieterGraef 0:f9b6112278fe 250 * state of the returned entry.
DieterGraef 0:f9b6112278fe 251 *
DieterGraef 0:f9b6112278fe 252 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
DieterGraef 0:f9b6112278fe 253 *
DieterGraef 0:f9b6112278fe 254 * In all cases, attempt to create new entries from an empty entry. If no
DieterGraef 0:f9b6112278fe 255 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
DieterGraef 0:f9b6112278fe 256 * old entries. Heuristic choose the least important entry for recycling.
DieterGraef 0:f9b6112278fe 257 *
DieterGraef 0:f9b6112278fe 258 * @param ipaddr IP address to find in ARP cache, or to add if not found.
DieterGraef 0:f9b6112278fe 259 * @param flags @see definition of ETHARP_FLAG_*
DieterGraef 0:f9b6112278fe 260 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
DieterGraef 0:f9b6112278fe 261 *
DieterGraef 0:f9b6112278fe 262 * @return The ARP entry index that matched or is created, ERR_MEM if no
DieterGraef 0:f9b6112278fe 263 * entry is found or could be recycled.
DieterGraef 0:f9b6112278fe 264 */
DieterGraef 0:f9b6112278fe 265 static s8_t
DieterGraef 0:f9b6112278fe 266 etharp_find_entry(ip_addr_t *ipaddr, u8_t flags)
DieterGraef 0:f9b6112278fe 267 {
DieterGraef 0:f9b6112278fe 268 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
DieterGraef 0:f9b6112278fe 269 s8_t empty = ARP_TABLE_SIZE;
DieterGraef 0:f9b6112278fe 270 u8_t i = 0, age_pending = 0, age_stable = 0;
DieterGraef 0:f9b6112278fe 271 /* oldest entry with packets on queue */
DieterGraef 0:f9b6112278fe 272 s8_t old_queue = ARP_TABLE_SIZE;
DieterGraef 0:f9b6112278fe 273 /* its age */
DieterGraef 0:f9b6112278fe 274 u8_t age_queue = 0;
DieterGraef 0:f9b6112278fe 275
DieterGraef 0:f9b6112278fe 276 /**
DieterGraef 0:f9b6112278fe 277 * a) do a search through the cache, remember candidates
DieterGraef 0:f9b6112278fe 278 * b) select candidate entry
DieterGraef 0:f9b6112278fe 279 * c) create new entry
DieterGraef 0:f9b6112278fe 280 */
DieterGraef 0:f9b6112278fe 281
DieterGraef 0:f9b6112278fe 282 /* a) in a single search sweep, do all of this
DieterGraef 0:f9b6112278fe 283 * 1) remember the first empty entry (if any)
DieterGraef 0:f9b6112278fe 284 * 2) remember the oldest stable entry (if any)
DieterGraef 0:f9b6112278fe 285 * 3) remember the oldest pending entry without queued packets (if any)
DieterGraef 0:f9b6112278fe 286 * 4) remember the oldest pending entry with queued packets (if any)
DieterGraef 0:f9b6112278fe 287 * 5) search for a matching IP entry, either pending or stable
DieterGraef 0:f9b6112278fe 288 * until 5 matches, or all entries are searched for.
DieterGraef 0:f9b6112278fe 289 */
DieterGraef 0:f9b6112278fe 290
DieterGraef 0:f9b6112278fe 291 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
DieterGraef 0:f9b6112278fe 292 u8_t state = arp_table[i].state;
DieterGraef 0:f9b6112278fe 293 /* no empty entry found yet and now we do find one? */
DieterGraef 0:f9b6112278fe 294 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
DieterGraef 0:f9b6112278fe 295 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_find_entry: found empty entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:f9b6112278fe 296 /* remember first empty entry */
DieterGraef 0:f9b6112278fe 297 empty = i;
DieterGraef 0:f9b6112278fe 298 } else if (state != ETHARP_STATE_EMPTY) {
DieterGraef 0:f9b6112278fe 299 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state >= ETHARP_STATE_STABLE",
DieterGraef 0:f9b6112278fe 300 state == ETHARP_STATE_PENDING || state >= ETHARP_STATE_STABLE);
DieterGraef 0:f9b6112278fe 301 /* if given, does IP address match IP address in ARP entry? */
DieterGraef 0:f9b6112278fe 302 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
DieterGraef 0:f9b6112278fe 303 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: found matching entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:f9b6112278fe 304 /* found exact IP address match, simply bail out */
DieterGraef 0:f9b6112278fe 305 return i;
DieterGraef 0:f9b6112278fe 306 }
DieterGraef 0:f9b6112278fe 307 /* pending entry? */
DieterGraef 0:f9b6112278fe 308 if (state == ETHARP_STATE_PENDING) {
DieterGraef 0:f9b6112278fe 309 /* pending with queued packets? */
DieterGraef 0:f9b6112278fe 310 if (arp_table[i].q != NULL) {
DieterGraef 0:f9b6112278fe 311 if (arp_table[i].ctime >= age_queue) {
DieterGraef 0:f9b6112278fe 312 old_queue = i;
DieterGraef 0:f9b6112278fe 313 age_queue = arp_table[i].ctime;
DieterGraef 0:f9b6112278fe 314 }
DieterGraef 0:f9b6112278fe 315 } else
DieterGraef 0:f9b6112278fe 316 /* pending without queued packets? */
DieterGraef 0:f9b6112278fe 317 {
DieterGraef 0:f9b6112278fe 318 if (arp_table[i].ctime >= age_pending) {
DieterGraef 0:f9b6112278fe 319 old_pending = i;
DieterGraef 0:f9b6112278fe 320 age_pending = arp_table[i].ctime;
DieterGraef 0:f9b6112278fe 321 }
DieterGraef 0:f9b6112278fe 322 }
DieterGraef 0:f9b6112278fe 323 /* stable entry? */
DieterGraef 0:f9b6112278fe 324 } else if (state >= ETHARP_STATE_STABLE) {
DieterGraef 0:f9b6112278fe 325 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:f9b6112278fe 326 /* don't record old_stable for static entries since they never expire */
DieterGraef 0:f9b6112278fe 327 if (state < ETHARP_STATE_STATIC)
DieterGraef 0:f9b6112278fe 328 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:f9b6112278fe 329 {
DieterGraef 0:f9b6112278fe 330 /* remember entry with oldest stable entry in oldest, its age in maxtime */
DieterGraef 0:f9b6112278fe 331 if (arp_table[i].ctime >= age_stable) {
DieterGraef 0:f9b6112278fe 332 old_stable = i;
DieterGraef 0:f9b6112278fe 333 age_stable = arp_table[i].ctime;
DieterGraef 0:f9b6112278fe 334 }
DieterGraef 0:f9b6112278fe 335 }
DieterGraef 0:f9b6112278fe 336 }
DieterGraef 0:f9b6112278fe 337 }
DieterGraef 0:f9b6112278fe 338 }
DieterGraef 0:f9b6112278fe 339 /* { we have no match } => try to create a new entry */
DieterGraef 0:f9b6112278fe 340
DieterGraef 0:f9b6112278fe 341 /* don't create new entry, only search? */
DieterGraef 0:f9b6112278fe 342 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
DieterGraef 0:f9b6112278fe 343 /* or no empty entry found and not allowed to recycle? */
DieterGraef 0:f9b6112278fe 344 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
DieterGraef 0:f9b6112278fe 345 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: no empty entry found and not allowed to recycle\n"));
DieterGraef 0:f9b6112278fe 346 return (s8_t)ERR_MEM;
DieterGraef 0:f9b6112278fe 347 }
DieterGraef 0:f9b6112278fe 348
DieterGraef 0:f9b6112278fe 349 /* b) choose the least destructive entry to recycle:
DieterGraef 0:f9b6112278fe 350 * 1) empty entry
DieterGraef 0:f9b6112278fe 351 * 2) oldest stable entry
DieterGraef 0:f9b6112278fe 352 * 3) oldest pending entry without queued packets
DieterGraef 0:f9b6112278fe 353 * 4) oldest pending entry with queued packets
DieterGraef 0:f9b6112278fe 354 *
DieterGraef 0:f9b6112278fe 355 * { ETHARP_FLAG_TRY_HARD is set at this point }
DieterGraef 0:f9b6112278fe 356 */
DieterGraef 0:f9b6112278fe 357
DieterGraef 0:f9b6112278fe 358 /* 1) empty entry available? */
DieterGraef 0:f9b6112278fe 359 if (empty < ARP_TABLE_SIZE) {
DieterGraef 0:f9b6112278fe 360 i = empty;
DieterGraef 0:f9b6112278fe 361 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:f9b6112278fe 362 } else {
DieterGraef 0:f9b6112278fe 363 /* 2) found recyclable stable entry? */
DieterGraef 0:f9b6112278fe 364 if (old_stable < ARP_TABLE_SIZE) {
DieterGraef 0:f9b6112278fe 365 /* recycle oldest stable*/
DieterGraef 0:f9b6112278fe 366 i = old_stable;
DieterGraef 0:f9b6112278fe 367 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:f9b6112278fe 368 /* no queued packets should exist on stable entries */
DieterGraef 0:f9b6112278fe 369 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
DieterGraef 0:f9b6112278fe 370 /* 3) found recyclable pending entry without queued packets? */
DieterGraef 0:f9b6112278fe 371 } else if (old_pending < ARP_TABLE_SIZE) {
DieterGraef 0:f9b6112278fe 372 /* recycle oldest pending */
DieterGraef 0:f9b6112278fe 373 i = old_pending;
DieterGraef 0:f9b6112278fe 374 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
DieterGraef 0:f9b6112278fe 375 /* 4) found recyclable pending entry with queued packets? */
DieterGraef 0:f9b6112278fe 376 } else if (old_queue < ARP_TABLE_SIZE) {
DieterGraef 0:f9b6112278fe 377 /* recycle oldest pending (queued packets are free in etharp_free_entry) */
DieterGraef 0:f9b6112278fe 378 i = old_queue;
DieterGraef 0:f9b6112278fe 379 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
DieterGraef 0:f9b6112278fe 380 /* no empty or recyclable entries found */
DieterGraef 0:f9b6112278fe 381 } else {
DieterGraef 0:f9b6112278fe 382 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: no empty or recyclable entries found\n"));
DieterGraef 0:f9b6112278fe 383 return (s8_t)ERR_MEM;
DieterGraef 0:f9b6112278fe 384 }
DieterGraef 0:f9b6112278fe 385
DieterGraef 0:f9b6112278fe 386 /* { empty or recyclable entry found } */
DieterGraef 0:f9b6112278fe 387 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
DieterGraef 0:f9b6112278fe 388 etharp_free_entry(i);
DieterGraef 0:f9b6112278fe 389 }
DieterGraef 0:f9b6112278fe 390
DieterGraef 0:f9b6112278fe 391 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
DieterGraef 0:f9b6112278fe 392 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
DieterGraef 0:f9b6112278fe 393 arp_table[i].state == ETHARP_STATE_EMPTY);
DieterGraef 0:f9b6112278fe 394
DieterGraef 0:f9b6112278fe 395 /* IP address given? */
DieterGraef 0:f9b6112278fe 396 if (ipaddr != NULL) {
DieterGraef 0:f9b6112278fe 397 /* set IP address */
DieterGraef 0:f9b6112278fe 398 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
DieterGraef 0:f9b6112278fe 399 }
DieterGraef 0:f9b6112278fe 400 arp_table[i].ctime = 0;
DieterGraef 0:f9b6112278fe 401 return (err_t)i;
DieterGraef 0:f9b6112278fe 402 }
DieterGraef 0:f9b6112278fe 403
DieterGraef 0:f9b6112278fe 404 /**
DieterGraef 0:f9b6112278fe 405 * Send an IP packet on the network using netif->linkoutput
DieterGraef 0:f9b6112278fe 406 * The ethernet header is filled in before sending.
DieterGraef 0:f9b6112278fe 407 *
DieterGraef 0:f9b6112278fe 408 * @params netif the lwIP network interface on which to send the packet
DieterGraef 0:f9b6112278fe 409 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
DieterGraef 0:f9b6112278fe 410 * @params src the source MAC address to be copied into the ethernet header
DieterGraef 0:f9b6112278fe 411 * @params dst the destination MAC address to be copied into the ethernet header
DieterGraef 0:f9b6112278fe 412 * @return ERR_OK if the packet was sent, any other err_t on failure
DieterGraef 0:f9b6112278fe 413 */
DieterGraef 0:f9b6112278fe 414 static err_t
DieterGraef 0:f9b6112278fe 415 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
DieterGraef 0:f9b6112278fe 416 {
DieterGraef 0:f9b6112278fe 417 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:f9b6112278fe 418
DieterGraef 0:f9b6112278fe 419 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
DieterGraef 0:f9b6112278fe 420 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
DieterGraef 0:f9b6112278fe 421 ETHADDR32_COPY(&ethhdr->dest, dst);
DieterGraef 0:f9b6112278fe 422 ETHADDR16_COPY(&ethhdr->src, src);
DieterGraef 0:f9b6112278fe 423 ethhdr->type = PP_HTONS(ETHTYPE_IP);
DieterGraef 0:f9b6112278fe 424 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
DieterGraef 0:f9b6112278fe 425 /* send the packet */
DieterGraef 0:f9b6112278fe 426 return netif->linkoutput(netif, p);
DieterGraef 0:f9b6112278fe 427 }
DieterGraef 0:f9b6112278fe 428
DieterGraef 0:f9b6112278fe 429 /**
DieterGraef 0:f9b6112278fe 430 * Update (or insert) a IP/MAC address pair in the ARP cache.
DieterGraef 0:f9b6112278fe 431 *
DieterGraef 0:f9b6112278fe 432 * If a pending entry is resolved, any queued packets will be sent
DieterGraef 0:f9b6112278fe 433 * at this point.
DieterGraef 0:f9b6112278fe 434 *
DieterGraef 0:f9b6112278fe 435 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
DieterGraef 0:f9b6112278fe 436 * @param ipaddr IP address of the inserted ARP entry.
DieterGraef 0:f9b6112278fe 437 * @param ethaddr Ethernet address of the inserted ARP entry.
DieterGraef 0:f9b6112278fe 438 * @param flags @see definition of ETHARP_FLAG_*
DieterGraef 0:f9b6112278fe 439 *
DieterGraef 0:f9b6112278fe 440 * @return
DieterGraef 0:f9b6112278fe 441 * - ERR_OK Succesfully updated ARP cache.
DieterGraef 0:f9b6112278fe 442 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
DieterGraef 0:f9b6112278fe 443 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
DieterGraef 0:f9b6112278fe 444 *
DieterGraef 0:f9b6112278fe 445 * @see pbuf_free()
DieterGraef 0:f9b6112278fe 446 */
DieterGraef 0:f9b6112278fe 447 static err_t
DieterGraef 0:f9b6112278fe 448 etharp_update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
DieterGraef 0:f9b6112278fe 449 {
DieterGraef 0:f9b6112278fe 450 s8_t i;
DieterGraef 0:f9b6112278fe 451 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
DieterGraef 0:f9b6112278fe 452 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_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",
DieterGraef 0:f9b6112278fe 453 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
DieterGraef 0:f9b6112278fe 454 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
DieterGraef 0:f9b6112278fe 455 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
DieterGraef 0:f9b6112278fe 456 /* non-unicast address? */
DieterGraef 0:f9b6112278fe 457 if (ip_addr_isany(ipaddr) ||
DieterGraef 0:f9b6112278fe 458 ip_addr_isbroadcast(ipaddr, netif) ||
DieterGraef 0:f9b6112278fe 459 ip_addr_ismulticast(ipaddr)) {
DieterGraef 0:f9b6112278fe 460 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
DieterGraef 0:f9b6112278fe 461 return ERR_ARG;
DieterGraef 0:f9b6112278fe 462 }
DieterGraef 0:f9b6112278fe 463 /* find or create ARP entry */
DieterGraef 0:f9b6112278fe 464 i = etharp_find_entry(ipaddr, flags);
DieterGraef 0:f9b6112278fe 465 /* bail out if no entry could be found */
DieterGraef 0:f9b6112278fe 466 if (i < 0) {
DieterGraef 0:f9b6112278fe 467 return (err_t)i;
DieterGraef 0:f9b6112278fe 468 }
DieterGraef 0:f9b6112278fe 469
DieterGraef 0:f9b6112278fe 470 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:f9b6112278fe 471 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
DieterGraef 0:f9b6112278fe 472 /* record static type */
DieterGraef 0:f9b6112278fe 473 arp_table[i].state = ETHARP_STATE_STATIC;
DieterGraef 0:f9b6112278fe 474 } else
DieterGraef 0:f9b6112278fe 475 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:f9b6112278fe 476 {
DieterGraef 0:f9b6112278fe 477 /* mark it stable */
DieterGraef 0:f9b6112278fe 478 arp_table[i].state = ETHARP_STATE_STABLE;
DieterGraef 0:f9b6112278fe 479 }
DieterGraef 0:f9b6112278fe 480
DieterGraef 0:f9b6112278fe 481 /* record network interface */
DieterGraef 0:f9b6112278fe 482 arp_table[i].netif = netif;
DieterGraef 0:f9b6112278fe 483 /* insert in SNMP ARP index tree */
DieterGraef 0:f9b6112278fe 484 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
DieterGraef 0:f9b6112278fe 485
DieterGraef 0:f9b6112278fe 486 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
DieterGraef 0:f9b6112278fe 487 /* update address */
DieterGraef 0:f9b6112278fe 488 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
DieterGraef 0:f9b6112278fe 489 /* reset time stamp */
DieterGraef 0:f9b6112278fe 490 arp_table[i].ctime = 0;
DieterGraef 0:f9b6112278fe 491 /* this is where we will send out queued packets! */
DieterGraef 0:f9b6112278fe 492 #if ARP_QUEUEING
DieterGraef 0:f9b6112278fe 493 while (arp_table[i].q != NULL) {
DieterGraef 0:f9b6112278fe 494 struct pbuf *p;
DieterGraef 0:f9b6112278fe 495 /* remember remainder of queue */
DieterGraef 0:f9b6112278fe 496 struct etharp_q_entry *q = arp_table[i].q;
DieterGraef 0:f9b6112278fe 497 /* pop first item off the queue */
DieterGraef 0:f9b6112278fe 498 arp_table[i].q = q->next;
DieterGraef 0:f9b6112278fe 499 /* get the packet pointer */
DieterGraef 0:f9b6112278fe 500 p = q->p;
DieterGraef 0:f9b6112278fe 501 /* now queue entry can be freed */
DieterGraef 0:f9b6112278fe 502 memp_free(MEMP_ARP_QUEUE, q);
DieterGraef 0:f9b6112278fe 503 #else /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 504 if (arp_table[i].q != NULL) {
DieterGraef 0:f9b6112278fe 505 struct pbuf *p = arp_table[i].q;
DieterGraef 0:f9b6112278fe 506 arp_table[i].q = NULL;
DieterGraef 0:f9b6112278fe 507 #endif /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 508 /* send the queued IP packet */
DieterGraef 0:f9b6112278fe 509 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
DieterGraef 0:f9b6112278fe 510 /* free the queued IP packet */
DieterGraef 0:f9b6112278fe 511 pbuf_free(p);
DieterGraef 0:f9b6112278fe 512 }
DieterGraef 0:f9b6112278fe 513 return ERR_OK;
DieterGraef 0:f9b6112278fe 514 }
DieterGraef 0:f9b6112278fe 515
DieterGraef 0:f9b6112278fe 516 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:f9b6112278fe 517 /** Add a new static entry to the ARP table. If an entry exists for the
DieterGraef 0:f9b6112278fe 518 * specified IP address, this entry is overwritten.
DieterGraef 0:f9b6112278fe 519 * If packets are queued for the specified IP address, they are sent out.
DieterGraef 0:f9b6112278fe 520 *
DieterGraef 0:f9b6112278fe 521 * @param ipaddr IP address for the new static entry
DieterGraef 0:f9b6112278fe 522 * @param ethaddr ethernet address for the new static entry
DieterGraef 0:f9b6112278fe 523 * @return @see return values of etharp_add_static_entry
DieterGraef 0:f9b6112278fe 524 */
DieterGraef 0:f9b6112278fe 525 err_t
DieterGraef 0:f9b6112278fe 526 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
DieterGraef 0:f9b6112278fe 527 {
DieterGraef 0:f9b6112278fe 528 struct netif *netif;
DieterGraef 0:f9b6112278fe 529 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_add_static_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",
DieterGraef 0:f9b6112278fe 530 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
DieterGraef 0:f9b6112278fe 531 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
DieterGraef 0:f9b6112278fe 532 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
DieterGraef 0:f9b6112278fe 533
DieterGraef 0:f9b6112278fe 534 netif = ip_route(ipaddr);
DieterGraef 0:f9b6112278fe 535 if (netif == NULL) {
DieterGraef 0:f9b6112278fe 536 return ERR_RTE;
DieterGraef 0:f9b6112278fe 537 }
DieterGraef 0:f9b6112278fe 538
DieterGraef 0:f9b6112278fe 539 return etharp_update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
DieterGraef 0:f9b6112278fe 540 }
DieterGraef 0:f9b6112278fe 541
DieterGraef 0:f9b6112278fe 542 /** Remove a static entry from the ARP table previously added with a call to
DieterGraef 0:f9b6112278fe 543 * etharp_add_static_entry.
DieterGraef 0:f9b6112278fe 544 *
DieterGraef 0:f9b6112278fe 545 * @param ipaddr IP address of the static entry to remove
DieterGraef 0:f9b6112278fe 546 * @return ERR_OK: entry removed
DieterGraef 0:f9b6112278fe 547 * ERR_MEM: entry wasn't found
DieterGraef 0:f9b6112278fe 548 * ERR_ARG: entry wasn't a static entry but a dynamic one
DieterGraef 0:f9b6112278fe 549 */
DieterGraef 0:f9b6112278fe 550 err_t
DieterGraef 0:f9b6112278fe 551 etharp_remove_static_entry(ip_addr_t *ipaddr)
DieterGraef 0:f9b6112278fe 552 {
DieterGraef 0:f9b6112278fe 553 s8_t i;
DieterGraef 0:f9b6112278fe 554 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
DieterGraef 0:f9b6112278fe 555 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
DieterGraef 0:f9b6112278fe 556
DieterGraef 0:f9b6112278fe 557 /* find or create ARP entry */
DieterGraef 0:f9b6112278fe 558 i = etharp_find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:f9b6112278fe 559 /* bail out if no entry could be found */
DieterGraef 0:f9b6112278fe 560 if (i < 0) {
DieterGraef 0:f9b6112278fe 561 return (err_t)i;
DieterGraef 0:f9b6112278fe 562 }
DieterGraef 0:f9b6112278fe 563
DieterGraef 0:f9b6112278fe 564 if (arp_table[i].state != ETHARP_STATE_STATIC) {
DieterGraef 0:f9b6112278fe 565 /* entry wasn't a static entry, cannot remove it */
DieterGraef 0:f9b6112278fe 566 return ERR_ARG;
DieterGraef 0:f9b6112278fe 567 }
DieterGraef 0:f9b6112278fe 568 /* entry found, free it */
DieterGraef 0:f9b6112278fe 569 etharp_free_entry(i);
DieterGraef 0:f9b6112278fe 570 return ERR_OK;
DieterGraef 0:f9b6112278fe 571 }
DieterGraef 0:f9b6112278fe 572 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:f9b6112278fe 573
DieterGraef 0:f9b6112278fe 574 /**
DieterGraef 0:f9b6112278fe 575 * Remove all ARP table entries of the specified netif.
DieterGraef 0:f9b6112278fe 576 *
DieterGraef 0:f9b6112278fe 577 * @param netif points to a network interface
DieterGraef 0:f9b6112278fe 578 */
DieterGraef 0:f9b6112278fe 579 void etharp_cleanup_netif(struct netif *netif)
DieterGraef 0:f9b6112278fe 580 {
DieterGraef 0:f9b6112278fe 581 u8_t i;
DieterGraef 0:f9b6112278fe 582
DieterGraef 0:f9b6112278fe 583 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
DieterGraef 0:f9b6112278fe 584 u8_t state = arp_table[i].state;
DieterGraef 0:f9b6112278fe 585 if ((state != ETHARP_STATE_EMPTY) && (arp_table[i].netif == netif)) {
DieterGraef 0:f9b6112278fe 586 etharp_free_entry(i);
DieterGraef 0:f9b6112278fe 587 }
DieterGraef 0:f9b6112278fe 588 }
DieterGraef 0:f9b6112278fe 589 }
DieterGraef 0:f9b6112278fe 590
DieterGraef 0:f9b6112278fe 591 /**
DieterGraef 0:f9b6112278fe 592 * Finds (stable) ethernet/IP address pair from ARP table
DieterGraef 0:f9b6112278fe 593 * using interface and IP address index.
DieterGraef 0:f9b6112278fe 594 * @note the addresses in the ARP table are in network order!
DieterGraef 0:f9b6112278fe 595 *
DieterGraef 0:f9b6112278fe 596 * @param netif points to interface index
DieterGraef 0:f9b6112278fe 597 * @param ipaddr points to the (network order) IP address index
DieterGraef 0:f9b6112278fe 598 * @param eth_ret points to return pointer
DieterGraef 0:f9b6112278fe 599 * @param ip_ret points to return pointer
DieterGraef 0:f9b6112278fe 600 * @return table index if found, -1 otherwise
DieterGraef 0:f9b6112278fe 601 */
DieterGraef 0:f9b6112278fe 602 s8_t
DieterGraef 0:f9b6112278fe 603 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
DieterGraef 0:f9b6112278fe 604 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
DieterGraef 0:f9b6112278fe 605 {
DieterGraef 0:f9b6112278fe 606 s8_t i;
DieterGraef 0:f9b6112278fe 607
DieterGraef 0:f9b6112278fe 608 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
DieterGraef 0:f9b6112278fe 609 eth_ret != NULL && ip_ret != NULL);
DieterGraef 0:f9b6112278fe 610
DieterGraef 0:f9b6112278fe 611 LWIP_UNUSED_ARG(netif);
DieterGraef 0:f9b6112278fe 612
DieterGraef 0:f9b6112278fe 613 i = etharp_find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:f9b6112278fe 614 if((i >= 0) && (arp_table[i].state >= ETHARP_STATE_STABLE)) {
DieterGraef 0:f9b6112278fe 615 *eth_ret = &arp_table[i].ethaddr;
DieterGraef 0:f9b6112278fe 616 *ip_ret = &arp_table[i].ipaddr;
DieterGraef 0:f9b6112278fe 617 return i;
DieterGraef 0:f9b6112278fe 618 }
DieterGraef 0:f9b6112278fe 619 return -1;
DieterGraef 0:f9b6112278fe 620 }
DieterGraef 0:f9b6112278fe 621
DieterGraef 0:f9b6112278fe 622 #if ETHARP_TRUST_IP_MAC
DieterGraef 0:f9b6112278fe 623 /**
DieterGraef 0:f9b6112278fe 624 * Updates the ARP table using the given IP packet.
DieterGraef 0:f9b6112278fe 625 *
DieterGraef 0:f9b6112278fe 626 * Uses the incoming IP packet's source address to update the
DieterGraef 0:f9b6112278fe 627 * ARP cache for the local network. The function does not alter
DieterGraef 0:f9b6112278fe 628 * or free the packet. This function must be called before the
DieterGraef 0:f9b6112278fe 629 * packet p is passed to the IP layer.
DieterGraef 0:f9b6112278fe 630 *
DieterGraef 0:f9b6112278fe 631 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
DieterGraef 0:f9b6112278fe 632 * @param p The IP packet that arrived on netif.
DieterGraef 0:f9b6112278fe 633 *
DieterGraef 0:f9b6112278fe 634 * @return NULL
DieterGraef 0:f9b6112278fe 635 *
DieterGraef 0:f9b6112278fe 636 * @see pbuf_free()
DieterGraef 0:f9b6112278fe 637 */
DieterGraef 0:f9b6112278fe 638 static void
DieterGraef 0:f9b6112278fe 639 etharp_ip_input(struct netif *netif, struct pbuf *p)
DieterGraef 0:f9b6112278fe 640 {
DieterGraef 0:f9b6112278fe 641 struct eth_hdr *ethhdr;
DieterGraef 0:f9b6112278fe 642 struct ip_hdr *iphdr;
DieterGraef 0:f9b6112278fe 643 ip_addr_t iphdr_src;
DieterGraef 0:f9b6112278fe 644 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
DieterGraef 0:f9b6112278fe 645
DieterGraef 0:f9b6112278fe 646 /* Only insert an entry if the source IP address of the
DieterGraef 0:f9b6112278fe 647 incoming IP packet comes from a host on the local network. */
DieterGraef 0:f9b6112278fe 648 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:f9b6112278fe 649 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
DieterGraef 0:f9b6112278fe 650 #if ETHARP_SUPPORT_VLAN
DieterGraef 0:f9b6112278fe 651 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
DieterGraef 0:f9b6112278fe 652 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
DieterGraef 0:f9b6112278fe 653 }
DieterGraef 0:f9b6112278fe 654 #endif /* ETHARP_SUPPORT_VLAN */
DieterGraef 0:f9b6112278fe 655
DieterGraef 0:f9b6112278fe 656 ip_addr_copy(iphdr_src, iphdr->src);
DieterGraef 0:f9b6112278fe 657
DieterGraef 0:f9b6112278fe 658 /* source is not on the local network? */
DieterGraef 0:f9b6112278fe 659 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
DieterGraef 0:f9b6112278fe 660 /* do nothing */
DieterGraef 0:f9b6112278fe 661 return;
DieterGraef 0:f9b6112278fe 662 }
DieterGraef 0:f9b6112278fe 663
DieterGraef 0:f9b6112278fe 664 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
DieterGraef 0:f9b6112278fe 665 /* update the source IP address in the cache, if present */
DieterGraef 0:f9b6112278fe 666 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
DieterGraef 0:f9b6112278fe 667 * back soon (for example, if the destination IP address is ours. */
DieterGraef 0:f9b6112278fe 668 etharp_update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:f9b6112278fe 669 }
DieterGraef 0:f9b6112278fe 670 #endif /* ETHARP_TRUST_IP_MAC */
DieterGraef 0:f9b6112278fe 671
DieterGraef 0:f9b6112278fe 672 /**
DieterGraef 0:f9b6112278fe 673 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
DieterGraef 0:f9b6112278fe 674 * send out queued IP packets. Updates cache with snooped address pairs.
DieterGraef 0:f9b6112278fe 675 *
DieterGraef 0:f9b6112278fe 676 * Should be called for incoming ARP packets. The pbuf in the argument
DieterGraef 0:f9b6112278fe 677 * is freed by this function.
DieterGraef 0:f9b6112278fe 678 *
DieterGraef 0:f9b6112278fe 679 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
DieterGraef 0:f9b6112278fe 680 * @param ethaddr Ethernet address of netif.
DieterGraef 0:f9b6112278fe 681 * @param p The ARP packet that arrived on netif. Is freed by this function.
DieterGraef 0:f9b6112278fe 682 *
DieterGraef 0:f9b6112278fe 683 * @return NULL
DieterGraef 0:f9b6112278fe 684 *
DieterGraef 0:f9b6112278fe 685 * @see pbuf_free()
DieterGraef 0:f9b6112278fe 686 */
DieterGraef 0:f9b6112278fe 687 static void
DieterGraef 0:f9b6112278fe 688 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
DieterGraef 0:f9b6112278fe 689 {
DieterGraef 0:f9b6112278fe 690 struct etharp_hdr *hdr;
DieterGraef 0:f9b6112278fe 691 struct eth_hdr *ethhdr;
DieterGraef 0:f9b6112278fe 692 /* these are aligned properly, whereas the ARP header fields might not be */
DieterGraef 0:f9b6112278fe 693 ip_addr_t sipaddr, dipaddr;
DieterGraef 0:f9b6112278fe 694 u8_t for_us;
DieterGraef 0:f9b6112278fe 695 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 696 const u8_t * ethdst_hwaddr;
DieterGraef 0:f9b6112278fe 697 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 698
DieterGraef 0:f9b6112278fe 699 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
DieterGraef 0:f9b6112278fe 700
DieterGraef 0:f9b6112278fe 701 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
DieterGraef 0:f9b6112278fe 702 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
DieterGraef 0:f9b6112278fe 703 if (p->len < SIZEOF_ETHARP_PACKET) {
DieterGraef 0:f9b6112278fe 704 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
DieterGraef 0:f9b6112278fe 705 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
DieterGraef 0:f9b6112278fe 706 (s16_t)SIZEOF_ETHARP_PACKET));
DieterGraef 0:f9b6112278fe 707 ETHARP_STATS_INC(etharp.lenerr);
DieterGraef 0:f9b6112278fe 708 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:f9b6112278fe 709 pbuf_free(p);
DieterGraef 0:f9b6112278fe 710 return;
DieterGraef 0:f9b6112278fe 711 }
DieterGraef 0:f9b6112278fe 712
DieterGraef 0:f9b6112278fe 713 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:f9b6112278fe 714 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
DieterGraef 0:f9b6112278fe 715 #if ETHARP_SUPPORT_VLAN
DieterGraef 0:f9b6112278fe 716 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
DieterGraef 0:f9b6112278fe 717 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
DieterGraef 0:f9b6112278fe 718 }
DieterGraef 0:f9b6112278fe 719 #endif /* ETHARP_SUPPORT_VLAN */
DieterGraef 0:f9b6112278fe 720
DieterGraef 0:f9b6112278fe 721 /* RFC 826 "Packet Reception": */
DieterGraef 0:f9b6112278fe 722 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
DieterGraef 0:f9b6112278fe 723 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
DieterGraef 0:f9b6112278fe 724 (hdr->protolen != sizeof(ip_addr_t)) ||
DieterGraef 0:f9b6112278fe 725 (hdr->proto != PP_HTONS(ETHTYPE_IP))) {
DieterGraef 0:f9b6112278fe 726 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
DieterGraef 0:f9b6112278fe 727 ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
DieterGraef 0:f9b6112278fe 728 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen));
DieterGraef 0:f9b6112278fe 729 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:f9b6112278fe 730 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:f9b6112278fe 731 pbuf_free(p);
DieterGraef 0:f9b6112278fe 732 return;
DieterGraef 0:f9b6112278fe 733 }
DieterGraef 0:f9b6112278fe 734 ETHARP_STATS_INC(etharp.recv);
DieterGraef 0:f9b6112278fe 735
DieterGraef 0:f9b6112278fe 736 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 737 /* We have to check if a host already has configured our random
DieterGraef 0:f9b6112278fe 738 * created link local address and continously check if there is
DieterGraef 0:f9b6112278fe 739 * a host with this IP-address so we can detect collisions */
DieterGraef 0:f9b6112278fe 740 autoip_arp_reply(netif, hdr);
DieterGraef 0:f9b6112278fe 741 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 742
DieterGraef 0:f9b6112278fe 743 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
DieterGraef 0:f9b6112278fe 744 * structure packing (not using structure copy which breaks strict-aliasing rules). */
DieterGraef 0:f9b6112278fe 745 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
DieterGraef 0:f9b6112278fe 746 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
DieterGraef 0:f9b6112278fe 747
DieterGraef 0:f9b6112278fe 748 /* this interface is not configured? */
DieterGraef 0:f9b6112278fe 749 if (ip_addr_isany(&netif->ip_addr)) {
DieterGraef 0:f9b6112278fe 750 for_us = 0;
DieterGraef 0:f9b6112278fe 751 } else {
DieterGraef 0:f9b6112278fe 752 /* ARP packet directed to us? */
DieterGraef 0:f9b6112278fe 753 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
DieterGraef 0:f9b6112278fe 754 }
DieterGraef 0:f9b6112278fe 755
DieterGraef 0:f9b6112278fe 756 /* ARP message directed to us?
DieterGraef 0:f9b6112278fe 757 -> add IP address in ARP cache; assume requester wants to talk to us,
DieterGraef 0:f9b6112278fe 758 can result in directly sending the queued packets for this host.
DieterGraef 0:f9b6112278fe 759 ARP message not directed to us?
DieterGraef 0:f9b6112278fe 760 -> update the source IP address in the cache, if present */
DieterGraef 0:f9b6112278fe 761 etharp_update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
DieterGraef 0:f9b6112278fe 762 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:f9b6112278fe 763
DieterGraef 0:f9b6112278fe 764 /* now act on the message itself */
DieterGraef 0:f9b6112278fe 765 switch (hdr->opcode) {
DieterGraef 0:f9b6112278fe 766 /* ARP request? */
DieterGraef 0:f9b6112278fe 767 case PP_HTONS(ARP_REQUEST):
DieterGraef 0:f9b6112278fe 768 /* ARP request. If it asked for our address, we send out a
DieterGraef 0:f9b6112278fe 769 * reply. In any case, we time-stamp any existing ARP entry,
DieterGraef 0:f9b6112278fe 770 * and possiby send out an IP packet that was queued on it. */
DieterGraef 0:f9b6112278fe 771
DieterGraef 0:f9b6112278fe 772 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
DieterGraef 0:f9b6112278fe 773 /* ARP request for our address? */
DieterGraef 0:f9b6112278fe 774 if (for_us) {
DieterGraef 0:f9b6112278fe 775
DieterGraef 0:f9b6112278fe 776 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
DieterGraef 0:f9b6112278fe 777 /* Re-use pbuf to send ARP reply.
DieterGraef 0:f9b6112278fe 778 Since we are re-using an existing pbuf, we can't call etharp_raw since
DieterGraef 0:f9b6112278fe 779 that would allocate a new pbuf. */
DieterGraef 0:f9b6112278fe 780 hdr->opcode = htons(ARP_REPLY);
DieterGraef 0:f9b6112278fe 781
DieterGraef 0:f9b6112278fe 782 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
DieterGraef 0:f9b6112278fe 783 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
DieterGraef 0:f9b6112278fe 784
DieterGraef 0:f9b6112278fe 785 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
DieterGraef 0:f9b6112278fe 786 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
DieterGraef 0:f9b6112278fe 787 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 788 /* If we are using Link-Local, all ARP packets that contain a Link-Local
DieterGraef 0:f9b6112278fe 789 * 'sender IP address' MUST be sent using link-layer broadcast instead of
DieterGraef 0:f9b6112278fe 790 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
DieterGraef 0:f9b6112278fe 791 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
DieterGraef 0:f9b6112278fe 792 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 793
DieterGraef 0:f9b6112278fe 794 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
DieterGraef 0:f9b6112278fe 795 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 796 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
DieterGraef 0:f9b6112278fe 797 #else /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 798 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
DieterGraef 0:f9b6112278fe 799 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 800 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
DieterGraef 0:f9b6112278fe 801 ETHADDR16_COPY(&ethhdr->src, ethaddr);
DieterGraef 0:f9b6112278fe 802
DieterGraef 0:f9b6112278fe 803 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
DieterGraef 0:f9b6112278fe 804 are already correct, we tested that before */
DieterGraef 0:f9b6112278fe 805
DieterGraef 0:f9b6112278fe 806 /* return ARP reply */
DieterGraef 0:f9b6112278fe 807 netif->linkoutput(netif, p);
DieterGraef 0:f9b6112278fe 808 /* we are not configured? */
DieterGraef 0:f9b6112278fe 809 } else if (ip_addr_isany(&netif->ip_addr)) {
DieterGraef 0:f9b6112278fe 810 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
DieterGraef 0:f9b6112278fe 811 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
DieterGraef 0:f9b6112278fe 812 /* request was not directed to us */
DieterGraef 0:f9b6112278fe 813 } else {
DieterGraef 0:f9b6112278fe 814 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
DieterGraef 0:f9b6112278fe 815 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
DieterGraef 0:f9b6112278fe 816 }
DieterGraef 0:f9b6112278fe 817 break;
DieterGraef 0:f9b6112278fe 818 case PP_HTONS(ARP_REPLY):
DieterGraef 0:f9b6112278fe 819 /* ARP reply. We already updated the ARP cache earlier. */
DieterGraef 0:f9b6112278fe 820 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
DieterGraef 0:f9b6112278fe 821 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
DieterGraef 0:f9b6112278fe 822 /* DHCP wants to know about ARP replies from any host with an
DieterGraef 0:f9b6112278fe 823 * IP address also offered to us by the DHCP server. We do not
DieterGraef 0:f9b6112278fe 824 * want to take a duplicate IP address on a single network.
DieterGraef 0:f9b6112278fe 825 * @todo How should we handle redundant (fail-over) interfaces? */
DieterGraef 0:f9b6112278fe 826 dhcp_arp_reply(netif, &sipaddr);
DieterGraef 0:f9b6112278fe 827 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
DieterGraef 0:f9b6112278fe 828 break;
DieterGraef 0:f9b6112278fe 829 default:
DieterGraef 0:f9b6112278fe 830 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
DieterGraef 0:f9b6112278fe 831 ETHARP_STATS_INC(etharp.err);
DieterGraef 0:f9b6112278fe 832 break;
DieterGraef 0:f9b6112278fe 833 }
DieterGraef 0:f9b6112278fe 834 /* free ARP packet */
DieterGraef 0:f9b6112278fe 835 pbuf_free(p);
DieterGraef 0:f9b6112278fe 836 }
DieterGraef 0:f9b6112278fe 837
DieterGraef 0:f9b6112278fe 838 /** Just a small helper function that sends a pbuf to an ethernet address
DieterGraef 0:f9b6112278fe 839 * in the arp_table specified by the index 'arp_idx'.
DieterGraef 0:f9b6112278fe 840 */
DieterGraef 0:f9b6112278fe 841 static err_t
DieterGraef 0:f9b6112278fe 842 etharp_output_to_arp_index(struct netif *netif, struct pbuf *q, u8_t arp_idx)
DieterGraef 0:f9b6112278fe 843 {
DieterGraef 0:f9b6112278fe 844 LWIP_ASSERT("arp_table[arp_idx].state >= ETHARP_STATE_STABLE",
DieterGraef 0:f9b6112278fe 845 arp_table[arp_idx].state >= ETHARP_STATE_STABLE);
DieterGraef 0:f9b6112278fe 846 /* if arp table entry is about to expire: re-request it,
DieterGraef 0:f9b6112278fe 847 but only if its state is ETHARP_STATE_STABLE to prevent flooding the
DieterGraef 0:f9b6112278fe 848 network with ARP requests if this address is used frequently. */
DieterGraef 0:f9b6112278fe 849 if ((arp_table[arp_idx].state == ETHARP_STATE_STABLE) &&
DieterGraef 0:f9b6112278fe 850 (arp_table[arp_idx].ctime >= ARP_AGE_REREQUEST_USED)) {
DieterGraef 0:f9b6112278fe 851 if (etharp_request(netif, &arp_table[arp_idx].ipaddr) == ERR_OK) {
DieterGraef 0:f9b6112278fe 852 arp_table[arp_idx].state = ETHARP_STATE_STABLE_REREQUESTING;
DieterGraef 0:f9b6112278fe 853 }
DieterGraef 0:f9b6112278fe 854 }
DieterGraef 0:f9b6112278fe 855
DieterGraef 0:f9b6112278fe 856 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
DieterGraef 0:f9b6112278fe 857 &arp_table[arp_idx].ethaddr);
DieterGraef 0:f9b6112278fe 858 }
DieterGraef 0:f9b6112278fe 859
DieterGraef 0:f9b6112278fe 860 /**
DieterGraef 0:f9b6112278fe 861 * Resolve and fill-in Ethernet address header for outgoing IP packet.
DieterGraef 0:f9b6112278fe 862 *
DieterGraef 0:f9b6112278fe 863 * For IP multicast and broadcast, corresponding Ethernet addresses
DieterGraef 0:f9b6112278fe 864 * are selected and the packet is transmitted on the link.
DieterGraef 0:f9b6112278fe 865 *
DieterGraef 0:f9b6112278fe 866 * For unicast addresses, the packet is submitted to etharp_query(). In
DieterGraef 0:f9b6112278fe 867 * case the IP address is outside the local network, the IP address of
DieterGraef 0:f9b6112278fe 868 * the gateway is used.
DieterGraef 0:f9b6112278fe 869 *
DieterGraef 0:f9b6112278fe 870 * @param netif The lwIP network interface which the IP packet will be sent on.
DieterGraef 0:f9b6112278fe 871 * @param q The pbuf(s) containing the IP packet to be sent.
DieterGraef 0:f9b6112278fe 872 * @param ipaddr The IP address of the packet destination.
DieterGraef 0:f9b6112278fe 873 *
DieterGraef 0:f9b6112278fe 874 * @return
DieterGraef 0:f9b6112278fe 875 * - ERR_RTE No route to destination (no gateway to external networks),
DieterGraef 0:f9b6112278fe 876 * or the return type of either etharp_query() or etharp_send_ip().
DieterGraef 0:f9b6112278fe 877 */
DieterGraef 0:f9b6112278fe 878 err_t
DieterGraef 0:f9b6112278fe 879 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
DieterGraef 0:f9b6112278fe 880 {
DieterGraef 0:f9b6112278fe 881 struct eth_addr *dest;
DieterGraef 0:f9b6112278fe 882 struct eth_addr mcastaddr;
DieterGraef 0:f9b6112278fe 883 ip_addr_t *dst_addr = ipaddr;
DieterGraef 0:f9b6112278fe 884
DieterGraef 0:f9b6112278fe 885 LWIP_ASSERT("netif != NULL", netif != NULL);
DieterGraef 0:f9b6112278fe 886 LWIP_ASSERT("q != NULL", q != NULL);
DieterGraef 0:f9b6112278fe 887 LWIP_ASSERT("ipaddr != NULL", ipaddr != NULL);
DieterGraef 0:f9b6112278fe 888
DieterGraef 0:f9b6112278fe 889 /* make room for Ethernet header - should not fail */
DieterGraef 0:f9b6112278fe 890 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
DieterGraef 0:f9b6112278fe 891 /* bail out */
DieterGraef 0:f9b6112278fe 892 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
DieterGraef 0:f9b6112278fe 893 ("etharp_output: could not allocate room for header.\n"));
DieterGraef 0:f9b6112278fe 894 LINK_STATS_INC(link.lenerr);
DieterGraef 0:f9b6112278fe 895 return ERR_BUF;
DieterGraef 0:f9b6112278fe 896 }
DieterGraef 0:f9b6112278fe 897
DieterGraef 0:f9b6112278fe 898 /* Determine on destination hardware address. Broadcasts and multicasts
DieterGraef 0:f9b6112278fe 899 * are special, other IP addresses are looked up in the ARP table. */
DieterGraef 0:f9b6112278fe 900
DieterGraef 0:f9b6112278fe 901 /* broadcast destination IP address? */
DieterGraef 0:f9b6112278fe 902 if (ip_addr_isbroadcast(ipaddr, netif)) {
DieterGraef 0:f9b6112278fe 903 /* broadcast on Ethernet also */
DieterGraef 0:f9b6112278fe 904 dest = (struct eth_addr *)&ethbroadcast;
DieterGraef 0:f9b6112278fe 905 /* multicast destination IP address? */
DieterGraef 0:f9b6112278fe 906 } else if (ip_addr_ismulticast(ipaddr)) {
DieterGraef 0:f9b6112278fe 907 /* Hash IP multicast address to MAC address.*/
DieterGraef 0:f9b6112278fe 908 mcastaddr.addr[0] = LL_MULTICAST_ADDR_0;
DieterGraef 0:f9b6112278fe 909 mcastaddr.addr[1] = LL_MULTICAST_ADDR_1;
DieterGraef 0:f9b6112278fe 910 mcastaddr.addr[2] = LL_MULTICAST_ADDR_2;
DieterGraef 0:f9b6112278fe 911 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
DieterGraef 0:f9b6112278fe 912 mcastaddr.addr[4] = ip4_addr3(ipaddr);
DieterGraef 0:f9b6112278fe 913 mcastaddr.addr[5] = ip4_addr4(ipaddr);
DieterGraef 0:f9b6112278fe 914 /* destination Ethernet address is multicast */
DieterGraef 0:f9b6112278fe 915 dest = &mcastaddr;
DieterGraef 0:f9b6112278fe 916 /* unicast destination IP address? */
DieterGraef 0:f9b6112278fe 917 } else {
DieterGraef 0:f9b6112278fe 918 s8_t i;
DieterGraef 0:f9b6112278fe 919 /* outside local network? if so, this can neither be a global broadcast nor
DieterGraef 0:f9b6112278fe 920 a subnet broadcast. */
DieterGraef 0:f9b6112278fe 921 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
DieterGraef 0:f9b6112278fe 922 !ip_addr_islinklocal(ipaddr)) {
DieterGraef 0:f9b6112278fe 923 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 924 struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
DieterGraef 0:f9b6112278fe 925 sizeof(struct eth_hdr));
DieterGraef 0:f9b6112278fe 926 /* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
DieterGraef 0:f9b6112278fe 927 a link-local source address must always be "directly to its destination
DieterGraef 0:f9b6112278fe 928 on the same physical link. The host MUST NOT send the packet to any
DieterGraef 0:f9b6112278fe 929 router for forwarding". */
DieterGraef 0:f9b6112278fe 930 if (!ip_addr_islinklocal(&iphdr->src))
DieterGraef 0:f9b6112278fe 931 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 932 {
DieterGraef 0:f9b6112278fe 933 /* interface has default gateway? */
DieterGraef 0:f9b6112278fe 934 if (!ip_addr_isany(&netif->gw)) {
DieterGraef 0:f9b6112278fe 935 /* send to hardware address of default gateway IP address */
DieterGraef 0:f9b6112278fe 936 dst_addr = &(netif->gw);
DieterGraef 0:f9b6112278fe 937 /* no default gateway available */
DieterGraef 0:f9b6112278fe 938 } else {
DieterGraef 0:f9b6112278fe 939 /* no route to destination error (default gateway missing) */
DieterGraef 0:f9b6112278fe 940 return ERR_RTE;
DieterGraef 0:f9b6112278fe 941 }
DieterGraef 0:f9b6112278fe 942 }
DieterGraef 0:f9b6112278fe 943 }
DieterGraef 0:f9b6112278fe 944 #if LWIP_NETIF_HWADDRHINT
DieterGraef 0:f9b6112278fe 945 if (netif->addr_hint != NULL) {
DieterGraef 0:f9b6112278fe 946 /* per-pcb cached entry was given */
DieterGraef 0:f9b6112278fe 947 u8_t etharp_cached_entry = *(netif->addr_hint);
DieterGraef 0:f9b6112278fe 948 if (etharp_cached_entry < ARP_TABLE_SIZE) {
DieterGraef 0:f9b6112278fe 949 #endif /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:f9b6112278fe 950 if ((arp_table[etharp_cached_entry].state >= ETHARP_STATE_STABLE) &&
DieterGraef 0:f9b6112278fe 951 (ip_addr_cmp(dst_addr, &arp_table[etharp_cached_entry].ipaddr))) {
DieterGraef 0:f9b6112278fe 952 /* the per-pcb-cached entry is stable and the right one! */
DieterGraef 0:f9b6112278fe 953 ETHARP_STATS_INC(etharp.cachehit);
DieterGraef 0:f9b6112278fe 954 return etharp_output_to_arp_index(netif, q, etharp_cached_entry);
DieterGraef 0:f9b6112278fe 955 }
DieterGraef 0:f9b6112278fe 956 #if LWIP_NETIF_HWADDRHINT
DieterGraef 0:f9b6112278fe 957 }
DieterGraef 0:f9b6112278fe 958 }
DieterGraef 0:f9b6112278fe 959 #endif /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:f9b6112278fe 960
DieterGraef 0:f9b6112278fe 961 /* find stable entry: do this here since this is a critical path for
DieterGraef 0:f9b6112278fe 962 throughput and etharp_find_entry() is kind of slow */
DieterGraef 0:f9b6112278fe 963 for (i = 0; i < ARP_TABLE_SIZE; i++) {
DieterGraef 0:f9b6112278fe 964 if ((arp_table[i].state >= ETHARP_STATE_STABLE) &&
DieterGraef 0:f9b6112278fe 965 (ip_addr_cmp(dst_addr, &arp_table[i].ipaddr))) {
DieterGraef 0:f9b6112278fe 966 /* found an existing, stable entry */
DieterGraef 0:f9b6112278fe 967 ETHARP_SET_HINT(netif, i);
DieterGraef 0:f9b6112278fe 968 return etharp_output_to_arp_index(netif, q, i);
DieterGraef 0:f9b6112278fe 969 }
DieterGraef 0:f9b6112278fe 970 }
DieterGraef 0:f9b6112278fe 971 /* no stable entry found, use the (slower) query function:
DieterGraef 0:f9b6112278fe 972 queue on destination Ethernet address belonging to ipaddr */
DieterGraef 0:f9b6112278fe 973 return etharp_query(netif, dst_addr, q);
DieterGraef 0:f9b6112278fe 974 }
DieterGraef 0:f9b6112278fe 975
DieterGraef 0:f9b6112278fe 976 /* continuation for multicast/broadcast destinations */
DieterGraef 0:f9b6112278fe 977 /* obtain source Ethernet address of the given interface */
DieterGraef 0:f9b6112278fe 978 /* send packet directly on the link */
DieterGraef 0:f9b6112278fe 979 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
DieterGraef 0:f9b6112278fe 980 }
DieterGraef 0:f9b6112278fe 981
DieterGraef 0:f9b6112278fe 982 /**
DieterGraef 0:f9b6112278fe 983 * Send an ARP request for the given IP address and/or queue a packet.
DieterGraef 0:f9b6112278fe 984 *
DieterGraef 0:f9b6112278fe 985 * If the IP address was not yet in the cache, a pending ARP cache entry
DieterGraef 0:f9b6112278fe 986 * is added and an ARP request is sent for the given address. The packet
DieterGraef 0:f9b6112278fe 987 * is queued on this entry.
DieterGraef 0:f9b6112278fe 988 *
DieterGraef 0:f9b6112278fe 989 * If the IP address was already pending in the cache, a new ARP request
DieterGraef 0:f9b6112278fe 990 * is sent for the given address. The packet is queued on this entry.
DieterGraef 0:f9b6112278fe 991 *
DieterGraef 0:f9b6112278fe 992 * If the IP address was already stable in the cache, and a packet is
DieterGraef 0:f9b6112278fe 993 * given, it is directly sent and no ARP request is sent out.
DieterGraef 0:f9b6112278fe 994 *
DieterGraef 0:f9b6112278fe 995 * If the IP address was already stable in the cache, and no packet is
DieterGraef 0:f9b6112278fe 996 * given, an ARP request is sent out.
DieterGraef 0:f9b6112278fe 997 *
DieterGraef 0:f9b6112278fe 998 * @param netif The lwIP network interface on which ipaddr
DieterGraef 0:f9b6112278fe 999 * must be queried for.
DieterGraef 0:f9b6112278fe 1000 * @param ipaddr The IP address to be resolved.
DieterGraef 0:f9b6112278fe 1001 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
DieterGraef 0:f9b6112278fe 1002 * q is not freed by this function.
DieterGraef 0:f9b6112278fe 1003 *
DieterGraef 0:f9b6112278fe 1004 * @note q must only be ONE packet, not a packet queue!
DieterGraef 0:f9b6112278fe 1005 *
DieterGraef 0:f9b6112278fe 1006 * @return
DieterGraef 0:f9b6112278fe 1007 * - ERR_BUF Could not make room for Ethernet header.
DieterGraef 0:f9b6112278fe 1008 * - ERR_MEM Hardware address unknown, and no more ARP entries available
DieterGraef 0:f9b6112278fe 1009 * to query for address or queue the packet.
DieterGraef 0:f9b6112278fe 1010 * - ERR_MEM Could not queue packet due to memory shortage.
DieterGraef 0:f9b6112278fe 1011 * - ERR_RTE No route to destination (no gateway to external networks).
DieterGraef 0:f9b6112278fe 1012 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
DieterGraef 0:f9b6112278fe 1013 *
DieterGraef 0:f9b6112278fe 1014 */
DieterGraef 0:f9b6112278fe 1015 err_t
DieterGraef 0:f9b6112278fe 1016 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
DieterGraef 0:f9b6112278fe 1017 {
DieterGraef 0:f9b6112278fe 1018 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
DieterGraef 0:f9b6112278fe 1019 err_t result = ERR_MEM;
DieterGraef 0:f9b6112278fe 1020 s8_t i; /* ARP entry index */
DieterGraef 0:f9b6112278fe 1021
DieterGraef 0:f9b6112278fe 1022 /* non-unicast address? */
DieterGraef 0:f9b6112278fe 1023 if (ip_addr_isbroadcast(ipaddr, netif) ||
DieterGraef 0:f9b6112278fe 1024 ip_addr_ismulticast(ipaddr) ||
DieterGraef 0:f9b6112278fe 1025 ip_addr_isany(ipaddr)) {
DieterGraef 0:f9b6112278fe 1026 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
DieterGraef 0:f9b6112278fe 1027 return ERR_ARG;
DieterGraef 0:f9b6112278fe 1028 }
DieterGraef 0:f9b6112278fe 1029
DieterGraef 0:f9b6112278fe 1030 /* find entry in ARP cache, ask to create entry if queueing packet */
DieterGraef 0:f9b6112278fe 1031 i = etharp_find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
DieterGraef 0:f9b6112278fe 1032
DieterGraef 0:f9b6112278fe 1033 /* could not find or create entry? */
DieterGraef 0:f9b6112278fe 1034 if (i < 0) {
DieterGraef 0:f9b6112278fe 1035 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
DieterGraef 0:f9b6112278fe 1036 if (q) {
DieterGraef 0:f9b6112278fe 1037 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
DieterGraef 0:f9b6112278fe 1038 ETHARP_STATS_INC(etharp.memerr);
DieterGraef 0:f9b6112278fe 1039 }
DieterGraef 0:f9b6112278fe 1040 return (err_t)i;
DieterGraef 0:f9b6112278fe 1041 }
DieterGraef 0:f9b6112278fe 1042
DieterGraef 0:f9b6112278fe 1043 /* mark a fresh entry as pending (we just sent a request) */
DieterGraef 0:f9b6112278fe 1044 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
DieterGraef 0:f9b6112278fe 1045 arp_table[i].state = ETHARP_STATE_PENDING;
DieterGraef 0:f9b6112278fe 1046 }
DieterGraef 0:f9b6112278fe 1047
DieterGraef 0:f9b6112278fe 1048 /* { i is either a STABLE or (new or existing) PENDING entry } */
DieterGraef 0:f9b6112278fe 1049 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
DieterGraef 0:f9b6112278fe 1050 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
DieterGraef 0:f9b6112278fe 1051 (arp_table[i].state >= ETHARP_STATE_STABLE)));
DieterGraef 0:f9b6112278fe 1052
DieterGraef 0:f9b6112278fe 1053 /* do we have a pending entry? or an implicit query request? */
DieterGraef 0:f9b6112278fe 1054 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
DieterGraef 0:f9b6112278fe 1055 /* try to resolve it; send out ARP request */
DieterGraef 0:f9b6112278fe 1056 result = etharp_request(netif, ipaddr);
DieterGraef 0:f9b6112278fe 1057 if (result != ERR_OK) {
DieterGraef 0:f9b6112278fe 1058 /* ARP request couldn't be sent */
DieterGraef 0:f9b6112278fe 1059 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
DieterGraef 0:f9b6112278fe 1060 since this failure could be temporary, and the next packet calling
DieterGraef 0:f9b6112278fe 1061 etharp_query again could lead to sending the queued packets. */
DieterGraef 0:f9b6112278fe 1062 }
DieterGraef 0:f9b6112278fe 1063 if (q == NULL) {
DieterGraef 0:f9b6112278fe 1064 return result;
DieterGraef 0:f9b6112278fe 1065 }
DieterGraef 0:f9b6112278fe 1066 }
DieterGraef 0:f9b6112278fe 1067
DieterGraef 0:f9b6112278fe 1068 /* packet given? */
DieterGraef 0:f9b6112278fe 1069 LWIP_ASSERT("q != NULL", q != NULL);
DieterGraef 0:f9b6112278fe 1070 /* stable entry? */
DieterGraef 0:f9b6112278fe 1071 if (arp_table[i].state >= ETHARP_STATE_STABLE) {
DieterGraef 0:f9b6112278fe 1072 /* we have a valid IP->Ethernet address mapping */
DieterGraef 0:f9b6112278fe 1073 ETHARP_SET_HINT(netif, i);
DieterGraef 0:f9b6112278fe 1074 /* send the packet */
DieterGraef 0:f9b6112278fe 1075 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
DieterGraef 0:f9b6112278fe 1076 /* pending entry? (either just created or already pending */
DieterGraef 0:f9b6112278fe 1077 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
DieterGraef 0:f9b6112278fe 1078 /* entry is still pending, queue the given packet 'q' */
DieterGraef 0:f9b6112278fe 1079 struct pbuf *p;
DieterGraef 0:f9b6112278fe 1080 int copy_needed = 0;
DieterGraef 0:f9b6112278fe 1081 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
DieterGraef 0:f9b6112278fe 1082 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
DieterGraef 0:f9b6112278fe 1083 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
DieterGraef 0:f9b6112278fe 1084 p = q;
DieterGraef 0:f9b6112278fe 1085 while (p) {
DieterGraef 0:f9b6112278fe 1086 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
DieterGraef 0:f9b6112278fe 1087 if(p->type != PBUF_ROM) {
DieterGraef 0:f9b6112278fe 1088 copy_needed = 1;
DieterGraef 0:f9b6112278fe 1089 break;
DieterGraef 0:f9b6112278fe 1090 }
DieterGraef 0:f9b6112278fe 1091 p = p->next;
DieterGraef 0:f9b6112278fe 1092 }
DieterGraef 0:f9b6112278fe 1093 if(copy_needed) {
DieterGraef 0:f9b6112278fe 1094 /* copy the whole packet into new pbufs */
DieterGraef 0:f9b6112278fe 1095 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
DieterGraef 0:f9b6112278fe 1096 if(p != NULL) {
DieterGraef 0:f9b6112278fe 1097 if (pbuf_copy(p, q) != ERR_OK) {
DieterGraef 0:f9b6112278fe 1098 pbuf_free(p);
DieterGraef 0:f9b6112278fe 1099 p = NULL;
DieterGraef 0:f9b6112278fe 1100 }
DieterGraef 0:f9b6112278fe 1101 }
DieterGraef 0:f9b6112278fe 1102 } else {
DieterGraef 0:f9b6112278fe 1103 /* referencing the old pbuf is enough */
DieterGraef 0:f9b6112278fe 1104 p = q;
DieterGraef 0:f9b6112278fe 1105 pbuf_ref(p);
DieterGraef 0:f9b6112278fe 1106 }
DieterGraef 0:f9b6112278fe 1107 /* packet could be taken over? */
DieterGraef 0:f9b6112278fe 1108 if (p != NULL) {
DieterGraef 0:f9b6112278fe 1109 /* queue packet ... */
DieterGraef 0:f9b6112278fe 1110 #if ARP_QUEUEING
DieterGraef 0:f9b6112278fe 1111 struct etharp_q_entry *new_entry;
DieterGraef 0:f9b6112278fe 1112 /* allocate a new arp queue entry */
DieterGraef 0:f9b6112278fe 1113 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
DieterGraef 0:f9b6112278fe 1114 if (new_entry != NULL) {
DieterGraef 0:f9b6112278fe 1115 new_entry->next = 0;
DieterGraef 0:f9b6112278fe 1116 new_entry->p = p;
DieterGraef 0:f9b6112278fe 1117 if(arp_table[i].q != NULL) {
DieterGraef 0:f9b6112278fe 1118 /* queue was already existent, append the new entry to the end */
DieterGraef 0:f9b6112278fe 1119 struct etharp_q_entry *r;
DieterGraef 0:f9b6112278fe 1120 r = arp_table[i].q;
DieterGraef 0:f9b6112278fe 1121 while (r->next != NULL) {
DieterGraef 0:f9b6112278fe 1122 r = r->next;
DieterGraef 0:f9b6112278fe 1123 }
DieterGraef 0:f9b6112278fe 1124 r->next = new_entry;
DieterGraef 0:f9b6112278fe 1125 } else {
DieterGraef 0:f9b6112278fe 1126 /* queue did not exist, first item in queue */
DieterGraef 0:f9b6112278fe 1127 arp_table[i].q = new_entry;
DieterGraef 0:f9b6112278fe 1128 }
DieterGraef 0:f9b6112278fe 1129 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
DieterGraef 0:f9b6112278fe 1130 result = ERR_OK;
DieterGraef 0:f9b6112278fe 1131 } else {
DieterGraef 0:f9b6112278fe 1132 /* the pool MEMP_ARP_QUEUE is empty */
DieterGraef 0:f9b6112278fe 1133 pbuf_free(p);
DieterGraef 0:f9b6112278fe 1134 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));
DieterGraef 0:f9b6112278fe 1135 result = ERR_MEM;
DieterGraef 0:f9b6112278fe 1136 }
DieterGraef 0:f9b6112278fe 1137 #else /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 1138 /* always queue one packet per ARP request only, freeing a previously queued packet */
DieterGraef 0:f9b6112278fe 1139 if (arp_table[i].q != NULL) {
DieterGraef 0:f9b6112278fe 1140 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: dropped previously queued packet %p for ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
DieterGraef 0:f9b6112278fe 1141 pbuf_free(arp_table[i].q);
DieterGraef 0:f9b6112278fe 1142 }
DieterGraef 0:f9b6112278fe 1143 arp_table[i].q = p;
DieterGraef 0:f9b6112278fe 1144 result = ERR_OK;
DieterGraef 0:f9b6112278fe 1145 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
DieterGraef 0:f9b6112278fe 1146 #endif /* ARP_QUEUEING */
DieterGraef 0:f9b6112278fe 1147 } else {
DieterGraef 0:f9b6112278fe 1148 ETHARP_STATS_INC(etharp.memerr);
DieterGraef 0:f9b6112278fe 1149 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));
DieterGraef 0:f9b6112278fe 1150 result = ERR_MEM;
DieterGraef 0:f9b6112278fe 1151 }
DieterGraef 0:f9b6112278fe 1152 }
DieterGraef 0:f9b6112278fe 1153 return result;
DieterGraef 0:f9b6112278fe 1154 }
DieterGraef 0:f9b6112278fe 1155
DieterGraef 0:f9b6112278fe 1156 /**
DieterGraef 0:f9b6112278fe 1157 * Send a raw ARP packet (opcode and all addresses can be modified)
DieterGraef 0:f9b6112278fe 1158 *
DieterGraef 0:f9b6112278fe 1159 * @param netif the lwip network interface on which to send the ARP packet
DieterGraef 0:f9b6112278fe 1160 * @param ethsrc_addr the source MAC address for the ethernet header
DieterGraef 0:f9b6112278fe 1161 * @param ethdst_addr the destination MAC address for the ethernet header
DieterGraef 0:f9b6112278fe 1162 * @param hwsrc_addr the source MAC address for the ARP protocol header
DieterGraef 0:f9b6112278fe 1163 * @param ipsrc_addr the source IP address for the ARP protocol header
DieterGraef 0:f9b6112278fe 1164 * @param hwdst_addr the destination MAC address for the ARP protocol header
DieterGraef 0:f9b6112278fe 1165 * @param ipdst_addr the destination IP address for the ARP protocol header
DieterGraef 0:f9b6112278fe 1166 * @param opcode the type of the ARP packet
DieterGraef 0:f9b6112278fe 1167 * @return ERR_OK if the ARP packet has been sent
DieterGraef 0:f9b6112278fe 1168 * ERR_MEM if the ARP packet couldn't be allocated
DieterGraef 0:f9b6112278fe 1169 * any other err_t on failure
DieterGraef 0:f9b6112278fe 1170 */
DieterGraef 0:f9b6112278fe 1171 #if !LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 1172 static
DieterGraef 0:f9b6112278fe 1173 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 1174 err_t
DieterGraef 0:f9b6112278fe 1175 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
DieterGraef 0:f9b6112278fe 1176 const struct eth_addr *ethdst_addr,
DieterGraef 0:f9b6112278fe 1177 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
DieterGraef 0:f9b6112278fe 1178 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
DieterGraef 0:f9b6112278fe 1179 const u16_t opcode)
DieterGraef 0:f9b6112278fe 1180 {
DieterGraef 0:f9b6112278fe 1181 struct pbuf *p;
DieterGraef 0:f9b6112278fe 1182 err_t result = ERR_OK;
DieterGraef 0:f9b6112278fe 1183 struct eth_hdr *ethhdr;
DieterGraef 0:f9b6112278fe 1184 struct etharp_hdr *hdr;
DieterGraef 0:f9b6112278fe 1185 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 1186 const u8_t * ethdst_hwaddr;
DieterGraef 0:f9b6112278fe 1187 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 1188
DieterGraef 0:f9b6112278fe 1189 LWIP_ASSERT("netif != NULL", netif != NULL);
DieterGraef 0:f9b6112278fe 1190
DieterGraef 0:f9b6112278fe 1191 /* allocate a pbuf for the outgoing ARP request packet */
DieterGraef 0:f9b6112278fe 1192 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
DieterGraef 0:f9b6112278fe 1193 /* could allocate a pbuf for an ARP request? */
DieterGraef 0:f9b6112278fe 1194 if (p == NULL) {
DieterGraef 0:f9b6112278fe 1195 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
DieterGraef 0:f9b6112278fe 1196 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
DieterGraef 0:f9b6112278fe 1197 ETHARP_STATS_INC(etharp.memerr);
DieterGraef 0:f9b6112278fe 1198 return ERR_MEM;
DieterGraef 0:f9b6112278fe 1199 }
DieterGraef 0:f9b6112278fe 1200 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
DieterGraef 0:f9b6112278fe 1201 (p->len >= SIZEOF_ETHARP_PACKET));
DieterGraef 0:f9b6112278fe 1202
DieterGraef 0:f9b6112278fe 1203 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:f9b6112278fe 1204 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
DieterGraef 0:f9b6112278fe 1205 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
DieterGraef 0:f9b6112278fe 1206 hdr->opcode = htons(opcode);
DieterGraef 0:f9b6112278fe 1207
DieterGraef 0:f9b6112278fe 1208 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
DieterGraef 0:f9b6112278fe 1209 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
DieterGraef 0:f9b6112278fe 1210 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 1211 /* If we are using Link-Local, all ARP packets that contain a Link-Local
DieterGraef 0:f9b6112278fe 1212 * 'sender IP address' MUST be sent using link-layer broadcast instead of
DieterGraef 0:f9b6112278fe 1213 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
DieterGraef 0:f9b6112278fe 1214 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
DieterGraef 0:f9b6112278fe 1215 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 1216 /* Write the ARP MAC-Addresses */
DieterGraef 0:f9b6112278fe 1217 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
DieterGraef 0:f9b6112278fe 1218 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
DieterGraef 0:f9b6112278fe 1219 /* Write the Ethernet MAC-Addresses */
DieterGraef 0:f9b6112278fe 1220 #if LWIP_AUTOIP
DieterGraef 0:f9b6112278fe 1221 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
DieterGraef 0:f9b6112278fe 1222 #else /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 1223 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
DieterGraef 0:f9b6112278fe 1224 #endif /* LWIP_AUTOIP */
DieterGraef 0:f9b6112278fe 1225 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
DieterGraef 0:f9b6112278fe 1226 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
DieterGraef 0:f9b6112278fe 1227 * structure packing. */
DieterGraef 0:f9b6112278fe 1228 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
DieterGraef 0:f9b6112278fe 1229 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
DieterGraef 0:f9b6112278fe 1230
DieterGraef 0:f9b6112278fe 1231 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
DieterGraef 0:f9b6112278fe 1232 hdr->proto = PP_HTONS(ETHTYPE_IP);
DieterGraef 0:f9b6112278fe 1233 /* set hwlen and protolen */
DieterGraef 0:f9b6112278fe 1234 hdr->hwlen = ETHARP_HWADDR_LEN;
DieterGraef 0:f9b6112278fe 1235 hdr->protolen = sizeof(ip_addr_t);
DieterGraef 0:f9b6112278fe 1236
DieterGraef 0:f9b6112278fe 1237 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
DieterGraef 0:f9b6112278fe 1238 /* send ARP query */
DieterGraef 0:f9b6112278fe 1239 result = netif->linkoutput(netif, p);
DieterGraef 0:f9b6112278fe 1240 ETHARP_STATS_INC(etharp.xmit);
DieterGraef 0:f9b6112278fe 1241 /* free ARP query packet */
DieterGraef 0:f9b6112278fe 1242 pbuf_free(p);
DieterGraef 0:f9b6112278fe 1243 p = NULL;
DieterGraef 0:f9b6112278fe 1244 /* could not allocate pbuf for ARP request */
DieterGraef 0:f9b6112278fe 1245
DieterGraef 0:f9b6112278fe 1246 return result;
DieterGraef 0:f9b6112278fe 1247 }
DieterGraef 0:f9b6112278fe 1248
DieterGraef 0:f9b6112278fe 1249 /**
DieterGraef 0:f9b6112278fe 1250 * Send an ARP request packet asking for ipaddr.
DieterGraef 0:f9b6112278fe 1251 *
DieterGraef 0:f9b6112278fe 1252 * @param netif the lwip network interface on which to send the request
DieterGraef 0:f9b6112278fe 1253 * @param ipaddr the IP address for which to ask
DieterGraef 0:f9b6112278fe 1254 * @return ERR_OK if the request has been sent
DieterGraef 0:f9b6112278fe 1255 * ERR_MEM if the ARP packet couldn't be allocated
DieterGraef 0:f9b6112278fe 1256 * any other err_t on failure
DieterGraef 0:f9b6112278fe 1257 */
DieterGraef 0:f9b6112278fe 1258 err_t
DieterGraef 0:f9b6112278fe 1259 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
DieterGraef 0:f9b6112278fe 1260 {
DieterGraef 0:f9b6112278fe 1261 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
DieterGraef 0:f9b6112278fe 1262 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
DieterGraef 0:f9b6112278fe 1263 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
DieterGraef 0:f9b6112278fe 1264 ipaddr, ARP_REQUEST);
DieterGraef 0:f9b6112278fe 1265 }
DieterGraef 0:f9b6112278fe 1266 #endif /* LWIP_ARP */
DieterGraef 0:f9b6112278fe 1267
DieterGraef 0:f9b6112278fe 1268 /**
DieterGraef 0:f9b6112278fe 1269 * Process received ethernet frames. Using this function instead of directly
DieterGraef 0:f9b6112278fe 1270 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
DieterGraef 0:f9b6112278fe 1271 * the ARP cache is protected from concurrent access.
DieterGraef 0:f9b6112278fe 1272 *
DieterGraef 0:f9b6112278fe 1273 * @param p the recevied packet, p->payload pointing to the ethernet header
DieterGraef 0:f9b6112278fe 1274 * @param netif the network interface on which the packet was received
DieterGraef 0:f9b6112278fe 1275 */
DieterGraef 0:f9b6112278fe 1276 err_t
DieterGraef 0:f9b6112278fe 1277 ethernet_input(struct pbuf *p, struct netif *netif)
DieterGraef 0:f9b6112278fe 1278 {
DieterGraef 0:f9b6112278fe 1279 struct eth_hdr* ethhdr;
DieterGraef 0:f9b6112278fe 1280 u16_t type;
DieterGraef 0:f9b6112278fe 1281 #if LWIP_ARP || ETHARP_SUPPORT_VLAN
DieterGraef 0:f9b6112278fe 1282 s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
DieterGraef 0:f9b6112278fe 1283 #endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */
DieterGraef 0:f9b6112278fe 1284
DieterGraef 0:f9b6112278fe 1285 if (p->len <= SIZEOF_ETH_HDR) {
DieterGraef 0:f9b6112278fe 1286 /* a packet with only an ethernet header (or less) is not valid for us */
DieterGraef 0:f9b6112278fe 1287 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:f9b6112278fe 1288 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:f9b6112278fe 1289 goto free_and_return;
DieterGraef 0:f9b6112278fe 1290 }
DieterGraef 0:f9b6112278fe 1291
DieterGraef 0:f9b6112278fe 1292 /* points to packet payload, which starts with an Ethernet header */
DieterGraef 0:f9b6112278fe 1293 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:f9b6112278fe 1294 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
DieterGraef 0:f9b6112278fe 1295 ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
DieterGraef 0:f9b6112278fe 1296 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
DieterGraef 0:f9b6112278fe 1297 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
DieterGraef 0:f9b6112278fe 1298 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
DieterGraef 0:f9b6112278fe 1299 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
DieterGraef 0:f9b6112278fe 1300 (unsigned)htons(ethhdr->type)));
DieterGraef 0:f9b6112278fe 1301
DieterGraef 0:f9b6112278fe 1302 type = ethhdr->type;
DieterGraef 0:f9b6112278fe 1303 #if ETHARP_SUPPORT_VLAN
DieterGraef 0:f9b6112278fe 1304 if (type == PP_HTONS(ETHTYPE_VLAN)) {
DieterGraef 0:f9b6112278fe 1305 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
DieterGraef 0:f9b6112278fe 1306 if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
DieterGraef 0:f9b6112278fe 1307 /* a packet with only an ethernet/vlan header (or less) is not valid for us */
DieterGraef 0:f9b6112278fe 1308 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:f9b6112278fe 1309 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:f9b6112278fe 1310 goto free_and_return;
DieterGraef 0:f9b6112278fe 1311 }
DieterGraef 0:f9b6112278fe 1312 #if defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
DieterGraef 0:f9b6112278fe 1313 #ifdef ETHARP_VLAN_CHECK_FN
DieterGraef 0:f9b6112278fe 1314 if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
DieterGraef 0:f9b6112278fe 1315 #elif defined(ETHARP_VLAN_CHECK)
DieterGraef 0:f9b6112278fe 1316 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
DieterGraef 0:f9b6112278fe 1317 #endif
DieterGraef 0:f9b6112278fe 1318 /* silently ignore this packet: not for our VLAN */
DieterGraef 0:f9b6112278fe 1319 pbuf_free(p);
DieterGraef 0:f9b6112278fe 1320 return ERR_OK;
DieterGraef 0:f9b6112278fe 1321 }
DieterGraef 0:f9b6112278fe 1322 #endif /* defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
DieterGraef 0:f9b6112278fe 1323 type = vlan->tpid;
DieterGraef 0:f9b6112278fe 1324 ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
DieterGraef 0:f9b6112278fe 1325 }
DieterGraef 0:f9b6112278fe 1326 #endif /* ETHARP_SUPPORT_VLAN */
DieterGraef 0:f9b6112278fe 1327
DieterGraef 0:f9b6112278fe 1328 #if LWIP_ARP_FILTER_NETIF
DieterGraef 0:f9b6112278fe 1329 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
DieterGraef 0:f9b6112278fe 1330 #endif /* LWIP_ARP_FILTER_NETIF*/
DieterGraef 0:f9b6112278fe 1331
DieterGraef 0:f9b6112278fe 1332 if (ethhdr->dest.addr[0] & 1) {
DieterGraef 0:f9b6112278fe 1333 /* this might be a multicast or broadcast packet */
DieterGraef 0:f9b6112278fe 1334 if (ethhdr->dest.addr[0] == LL_MULTICAST_ADDR_0) {
DieterGraef 0:f9b6112278fe 1335 if ((ethhdr->dest.addr[1] == LL_MULTICAST_ADDR_1) &&
DieterGraef 0:f9b6112278fe 1336 (ethhdr->dest.addr[2] == LL_MULTICAST_ADDR_2)) {
DieterGraef 0:f9b6112278fe 1337 /* mark the pbuf as link-layer multicast */
DieterGraef 0:f9b6112278fe 1338 p->flags |= PBUF_FLAG_LLMCAST;
DieterGraef 0:f9b6112278fe 1339 }
DieterGraef 0:f9b6112278fe 1340 } else if (eth_addr_cmp(&ethhdr->dest, &ethbroadcast)) {
DieterGraef 0:f9b6112278fe 1341 /* mark the pbuf as link-layer broadcast */
DieterGraef 0:f9b6112278fe 1342 p->flags |= PBUF_FLAG_LLBCAST;
DieterGraef 0:f9b6112278fe 1343 }
DieterGraef 0:f9b6112278fe 1344 }
DieterGraef 0:f9b6112278fe 1345
DieterGraef 0:f9b6112278fe 1346 switch (type) {
DieterGraef 0:f9b6112278fe 1347 #if LWIP_ARP
DieterGraef 0:f9b6112278fe 1348 /* IP packet? */
DieterGraef 0:f9b6112278fe 1349 case PP_HTONS(ETHTYPE_IP):
DieterGraef 0:f9b6112278fe 1350 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
DieterGraef 0:f9b6112278fe 1351 goto free_and_return;
DieterGraef 0:f9b6112278fe 1352 }
DieterGraef 0:f9b6112278fe 1353 #if ETHARP_TRUST_IP_MAC
DieterGraef 0:f9b6112278fe 1354 /* update ARP table */
DieterGraef 0:f9b6112278fe 1355 etharp_ip_input(netif, p);
DieterGraef 0:f9b6112278fe 1356 #endif /* ETHARP_TRUST_IP_MAC */
DieterGraef 0:f9b6112278fe 1357 /* skip Ethernet header */
DieterGraef 0:f9b6112278fe 1358 if(pbuf_header(p, -ip_hdr_offset)) {
DieterGraef 0:f9b6112278fe 1359 LWIP_ASSERT("Can't move over header in packet", 0);
DieterGraef 0:f9b6112278fe 1360 goto free_and_return;
DieterGraef 0:f9b6112278fe 1361 } else {
DieterGraef 0:f9b6112278fe 1362 /* pass to IP layer */
DieterGraef 0:f9b6112278fe 1363 ip_input(p, netif);
DieterGraef 0:f9b6112278fe 1364 }
DieterGraef 0:f9b6112278fe 1365 break;
DieterGraef 0:f9b6112278fe 1366
DieterGraef 0:f9b6112278fe 1367 case PP_HTONS(ETHTYPE_ARP):
DieterGraef 0:f9b6112278fe 1368 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
DieterGraef 0:f9b6112278fe 1369 goto free_and_return;
DieterGraef 0:f9b6112278fe 1370 }
DieterGraef 0:f9b6112278fe 1371 /* pass p to ARP module */
DieterGraef 0:f9b6112278fe 1372 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
DieterGraef 0:f9b6112278fe 1373 break;
DieterGraef 0:f9b6112278fe 1374 #endif /* LWIP_ARP */
DieterGraef 0:f9b6112278fe 1375 #if PPPOE_SUPPORT
DieterGraef 0:f9b6112278fe 1376 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
DieterGraef 0:f9b6112278fe 1377 pppoe_disc_input(netif, p);
DieterGraef 0:f9b6112278fe 1378 break;
DieterGraef 0:f9b6112278fe 1379
DieterGraef 0:f9b6112278fe 1380 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
DieterGraef 0:f9b6112278fe 1381 pppoe_data_input(netif, p);
DieterGraef 0:f9b6112278fe 1382 break;
DieterGraef 0:f9b6112278fe 1383 #endif /* PPPOE_SUPPORT */
DieterGraef 0:f9b6112278fe 1384
DieterGraef 0:f9b6112278fe 1385 default:
DieterGraef 0:f9b6112278fe 1386 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:f9b6112278fe 1387 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:f9b6112278fe 1388 goto free_and_return;
DieterGraef 0:f9b6112278fe 1389 }
DieterGraef 0:f9b6112278fe 1390
DieterGraef 0:f9b6112278fe 1391 /* This means the pbuf is freed or consumed,
DieterGraef 0:f9b6112278fe 1392 so the caller doesn't have to free it again */
DieterGraef 0:f9b6112278fe 1393 return ERR_OK;
DieterGraef 0:f9b6112278fe 1394
DieterGraef 0:f9b6112278fe 1395 free_and_return:
DieterGraef 0:f9b6112278fe 1396 pbuf_free(p);
DieterGraef 0:f9b6112278fe 1397 return ERR_OK;
DieterGraef 0:f9b6112278fe 1398 }
DieterGraef 0:f9b6112278fe 1399 #endif /* LWIP_ARP || LWIP_ETHERNET */