Sam Walsh / F7_Ethernet

Forked from STM32F7 internet for nucleo F746ZG

Dependents:   Nucleo_F746ZG_Ethernet_MQTT_Ultrasound

Fork of F7_Ethernet by Dieter Graef

lwip/netif/etharp.c@2:b4727195c450, 2016-10-24 (annotated)

Committer:
EmbeddedSam
Date:
Mon Oct 24 12:59:21 2016 +0000
Revision:
2:b4727195c450
Parent:
0:d26c1b55cfca 
working with 1 ultrasound sensor approx 10hz update rate on mqtt

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:d26c1b55cfca 1 /**
DieterGraef 0:d26c1b55cfca 2 * @file
DieterGraef 0:d26c1b55cfca 3 * Address Resolution Protocol module for IP over Ethernet
DieterGraef 0:d26c1b55cfca 4 *
DieterGraef 0:d26c1b55cfca 5 * Functionally, ARP is divided into two parts. The first maps an IP address
DieterGraef 0:d26c1b55cfca 6 * to a physical address when sending a packet, and the second part answers
DieterGraef 0:d26c1b55cfca 7 * requests from other machines for our physical address.
DieterGraef 0:d26c1b55cfca 8 *
DieterGraef 0:d26c1b55cfca 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
DieterGraef 0:d26c1b55cfca 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
DieterGraef 0:d26c1b55cfca 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
DieterGraef 0:d26c1b55cfca 12 */
DieterGraef 0:d26c1b55cfca 13
DieterGraef 0:d26c1b55cfca 14 /*
DieterGraef 0:d26c1b55cfca 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
DieterGraef 0:d26c1b55cfca 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
DieterGraef 0:d26c1b55cfca 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
DieterGraef 0:d26c1b55cfca 18 * All rights reserved.
DieterGraef 0:d26c1b55cfca 19 *
DieterGraef 0:d26c1b55cfca 20 * Redistribution and use in source and binary forms, with or without modification,
DieterGraef 0:d26c1b55cfca 21 * are permitted provided that the following conditions are met:
DieterGraef 0:d26c1b55cfca 22 *
DieterGraef 0:d26c1b55cfca 23 * 1. Redistributions of source code must retain the above copyright notice,
DieterGraef 0:d26c1b55cfca 24 * this list of conditions and the following disclaimer.
DieterGraef 0:d26c1b55cfca 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
DieterGraef 0:d26c1b55cfca 26 * this list of conditions and the following disclaimer in the documentation
DieterGraef 0:d26c1b55cfca 27 * and/or other materials provided with the distribution.
DieterGraef 0:d26c1b55cfca 28 * 3. The name of the author may not be used to endorse or promote products
DieterGraef 0:d26c1b55cfca 29 * derived from this software without specific prior written permission.
DieterGraef 0:d26c1b55cfca 30 *
DieterGraef 0:d26c1b55cfca 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
DieterGraef 0:d26c1b55cfca 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
DieterGraef 0:d26c1b55cfca 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
DieterGraef 0:d26c1b55cfca 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
DieterGraef 0:d26c1b55cfca 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
DieterGraef 0:d26c1b55cfca 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:d26c1b55cfca 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:d26c1b55cfca 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
DieterGraef 0:d26c1b55cfca 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
DieterGraef 0:d26c1b55cfca 40 * OF SUCH DAMAGE.
DieterGraef 0:d26c1b55cfca 41 *
DieterGraef 0:d26c1b55cfca 42 * This file is part of the lwIP TCP/IP stack.
DieterGraef 0:d26c1b55cfca 43 *
DieterGraef 0:d26c1b55cfca 44 */
DieterGraef 0:d26c1b55cfca 45
DieterGraef 0:d26c1b55cfca 46 #include "lwip/opt.h"
DieterGraef 0:d26c1b55cfca 47
DieterGraef 0:d26c1b55cfca 48 #if LWIP_ARP || LWIP_ETHERNET
DieterGraef 0:d26c1b55cfca 49
DieterGraef 0:d26c1b55cfca 50 #include "lwip/ip_addr.h"
DieterGraef 0:d26c1b55cfca 51 #include "lwip/def.h"
DieterGraef 0:d26c1b55cfca 52 #include "lwip/ip.h"
DieterGraef 0:d26c1b55cfca 53 #include "lwip/stats.h"
DieterGraef 0:d26c1b55cfca 54 #include "lwip/snmp.h"
DieterGraef 0:d26c1b55cfca 55 #include "lwip/dhcp.h"
DieterGraef 0:d26c1b55cfca 56 #include "lwip/autoip.h"
DieterGraef 0:d26c1b55cfca 57 #include "netif/etharp.h"
DieterGraef 0:d26c1b55cfca 58
DieterGraef 0:d26c1b55cfca 59 #if PPPOE_SUPPORT
DieterGraef 0:d26c1b55cfca 60 #include "netif/ppp_oe.h"
DieterGraef 0:d26c1b55cfca 61 #endif /* PPPOE_SUPPORT */
DieterGraef 0:d26c1b55cfca 62
DieterGraef 0:d26c1b55cfca 63 #include <string.h>
DieterGraef 0:d26c1b55cfca 64
DieterGraef 0:d26c1b55cfca 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
DieterGraef 0:d26c1b55cfca 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
DieterGraef 0:d26c1b55cfca 67
DieterGraef 0:d26c1b55cfca 68 /** The 24-bit IANA multicast OUI is 01-00-5e: */
DieterGraef 0:d26c1b55cfca 69 #define LL_MULTICAST_ADDR_0 0x01
DieterGraef 0:d26c1b55cfca 70 #define LL_MULTICAST_ADDR_1 0x00
DieterGraef 0:d26c1b55cfca 71 #define LL_MULTICAST_ADDR_2 0x5e
DieterGraef 0:d26c1b55cfca 72
DieterGraef 0:d26c1b55cfca 73 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
DieterGraef 0:d26c1b55cfca 74
DieterGraef 0:d26c1b55cfca 75 /** the time an ARP entry stays valid after its last update,
DieterGraef 0:d26c1b55cfca 76 * for ARP_TMR_INTERVAL = 5000, this is
DieterGraef 0:d26c1b55cfca 77 * (240 * 5) seconds = 20 minutes.
DieterGraef 0:d26c1b55cfca 78 */
DieterGraef 0:d26c1b55cfca 79 #define ARP_MAXAGE 240
DieterGraef 0:d26c1b55cfca 80 /** Re-request a used ARP entry 1 minute before it would expire to prevent
DieterGraef 0:d26c1b55cfca 81 * breaking a steadily used connection because the ARP entry timed out. */
DieterGraef 0:d26c1b55cfca 82 #define ARP_AGE_REREQUEST_USED (ARP_MAXAGE - 12)
DieterGraef 0:d26c1b55cfca 83
DieterGraef 0:d26c1b55cfca 84 /** the time an ARP entry stays pending after first request,
DieterGraef 0:d26c1b55cfca 85 * for ARP_TMR_INTERVAL = 5000, this is
DieterGraef 0:d26c1b55cfca 86 * (2 * 5) seconds = 10 seconds.
DieterGraef 0:d26c1b55cfca 87 *
DieterGraef 0:d26c1b55cfca 88 * @internal Keep this number at least 2, otherwise it might
DieterGraef 0:d26c1b55cfca 89 * run out instantly if the timeout occurs directly after a request.
DieterGraef 0:d26c1b55cfca 90 */
DieterGraef 0:d26c1b55cfca 91 #define ARP_MAXPENDING 2
DieterGraef 0:d26c1b55cfca 92
DieterGraef 0:d26c1b55cfca 93 #define HWTYPE_ETHERNET 1
DieterGraef 0:d26c1b55cfca 94
DieterGraef 0:d26c1b55cfca 95 enum etharp_state {
DieterGraef 0:d26c1b55cfca 96 ETHARP_STATE_EMPTY = 0,
DieterGraef 0:d26c1b55cfca 97 ETHARP_STATE_PENDING,
DieterGraef 0:d26c1b55cfca 98 ETHARP_STATE_STABLE,
DieterGraef 0:d26c1b55cfca 99 ETHARP_STATE_STABLE_REREQUESTING
DieterGraef 0:d26c1b55cfca 100 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:d26c1b55cfca 101 ,ETHARP_STATE_STATIC
DieterGraef 0:d26c1b55cfca 102 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:d26c1b55cfca 103 };
DieterGraef 0:d26c1b55cfca 104
DieterGraef 0:d26c1b55cfca 105 struct etharp_entry {
DieterGraef 0:d26c1b55cfca 106 #if ARP_QUEUEING
DieterGraef 0:d26c1b55cfca 107 /** Pointer to queue of pending outgoing packets on this ARP entry. */
DieterGraef 0:d26c1b55cfca 108 struct etharp_q_entry *q;
DieterGraef 0:d26c1b55cfca 109 #else /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 110 /** Pointer to a single pending outgoing packet on this ARP entry. */
DieterGraef 0:d26c1b55cfca 111 struct pbuf *q;
DieterGraef 0:d26c1b55cfca 112 #endif /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 113 ip_addr_t ipaddr;
DieterGraef 0:d26c1b55cfca 114 struct netif *netif;
DieterGraef 0:d26c1b55cfca 115 struct eth_addr ethaddr;
DieterGraef 0:d26c1b55cfca 116 u8_t state;
DieterGraef 0:d26c1b55cfca 117 u8_t ctime;
DieterGraef 0:d26c1b55cfca 118 };
DieterGraef 0:d26c1b55cfca 119
DieterGraef 0:d26c1b55cfca 120 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
DieterGraef 0:d26c1b55cfca 121
DieterGraef 0:d26c1b55cfca 122 #if !LWIP_NETIF_HWADDRHINT
DieterGraef 0:d26c1b55cfca 123 static u8_t etharp_cached_entry;
DieterGraef 0:d26c1b55cfca 124 #endif /* !LWIP_NETIF_HWADDRHINT */
DieterGraef 0:d26c1b55cfca 125
DieterGraef 0:d26c1b55cfca 126 /** Try hard to create a new entry - we want the IP address to appear in
DieterGraef 0:d26c1b55cfca 127 the cache (even if this means removing an active entry or so). */
DieterGraef 0:d26c1b55cfca 128 #define ETHARP_FLAG_TRY_HARD 1
DieterGraef 0:d26c1b55cfca 129 #define ETHARP_FLAG_FIND_ONLY 2
DieterGraef 0:d26c1b55cfca 130 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:d26c1b55cfca 131 #define ETHARP_FLAG_STATIC_ENTRY 4
DieterGraef 0:d26c1b55cfca 132 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:d26c1b55cfca 133
DieterGraef 0:d26c1b55cfca 134 #if LWIP_NETIF_HWADDRHINT
DieterGraef 0:d26c1b55cfca 135 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
DieterGraef 0:d26c1b55cfca 136 *((netif)->addr_hint) = (hint);
DieterGraef 0:d26c1b55cfca 137 #else /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:d26c1b55cfca 138 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
DieterGraef 0:d26c1b55cfca 139 #endif /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:d26c1b55cfca 140
DieterGraef 0:d26c1b55cfca 141
DieterGraef 0:d26c1b55cfca 142 /* Some checks, instead of etharp_init(): */
DieterGraef 0:d26c1b55cfca 143 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
DieterGraef 0:d26c1b55cfca 144 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
DieterGraef 0:d26c1b55cfca 145 #endif
DieterGraef 0:d26c1b55cfca 146
DieterGraef 0:d26c1b55cfca 147
DieterGraef 0:d26c1b55cfca 148 #if ARP_QUEUEING
DieterGraef 0:d26c1b55cfca 149 /**
DieterGraef 0:d26c1b55cfca 150 * Free a complete queue of etharp entries
DieterGraef 0:d26c1b55cfca 151 *
DieterGraef 0:d26c1b55cfca 152 * @param q a qeueue of etharp_q_entry's to free
DieterGraef 0:d26c1b55cfca 153 */
DieterGraef 0:d26c1b55cfca 154 static void
DieterGraef 0:d26c1b55cfca 155 free_etharp_q(struct etharp_q_entry *q)
DieterGraef 0:d26c1b55cfca 156 {
DieterGraef 0:d26c1b55cfca 157 struct etharp_q_entry *r;
DieterGraef 0:d26c1b55cfca 158 LWIP_ASSERT("q != NULL", q != NULL);
DieterGraef 0:d26c1b55cfca 159 LWIP_ASSERT("q->p != NULL", q->p != NULL);
DieterGraef 0:d26c1b55cfca 160 while (q) {
DieterGraef 0:d26c1b55cfca 161 r = q;
DieterGraef 0:d26c1b55cfca 162 q = q->next;
DieterGraef 0:d26c1b55cfca 163 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
DieterGraef 0:d26c1b55cfca 164 pbuf_free(r->p);
DieterGraef 0:d26c1b55cfca 165 memp_free(MEMP_ARP_QUEUE, r);
DieterGraef 0:d26c1b55cfca 166 }
DieterGraef 0:d26c1b55cfca 167 }
DieterGraef 0:d26c1b55cfca 168 #else /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 169
DieterGraef 0:d26c1b55cfca 170 /** Compatibility define: free the queued pbuf */
DieterGraef 0:d26c1b55cfca 171 #define free_etharp_q(q) pbuf_free(q)
DieterGraef 0:d26c1b55cfca 172
DieterGraef 0:d26c1b55cfca 173 #endif /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 174
DieterGraef 0:d26c1b55cfca 175 /** Clean up ARP table entries */
DieterGraef 0:d26c1b55cfca 176 static void
DieterGraef 0:d26c1b55cfca 177 etharp_free_entry(int i)
DieterGraef 0:d26c1b55cfca 178 {
DieterGraef 0:d26c1b55cfca 179 /* remove from SNMP ARP index tree */
DieterGraef 0:d26c1b55cfca 180 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
DieterGraef 0:d26c1b55cfca 181 /* and empty packet queue */
DieterGraef 0:d26c1b55cfca 182 if (arp_table[i].q != NULL) {
DieterGraef 0:d26c1b55cfca 183 /* remove all queued packets */
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 185 free_etharp_q(arp_table[i].q);
DieterGraef 0:d26c1b55cfca 186 arp_table[i].q = NULL;
DieterGraef 0:d26c1b55cfca 187 }
DieterGraef 0:d26c1b55cfca 188 /* recycle entry for re-use */
DieterGraef 0:d26c1b55cfca 189 arp_table[i].state = ETHARP_STATE_EMPTY;
DieterGraef 0:d26c1b55cfca 190 #ifdef LWIP_DEBUG
DieterGraef 0:d26c1b55cfca 191 /* for debugging, clean out the complete entry */
DieterGraef 0:d26c1b55cfca 192 arp_table[i].ctime = 0;
DieterGraef 0:d26c1b55cfca 193 arp_table[i].netif = NULL;
DieterGraef 0:d26c1b55cfca 194 ip_addr_set_zero(&arp_table[i].ipaddr);
DieterGraef 0:d26c1b55cfca 195 arp_table[i].ethaddr = ethzero;
DieterGraef 0:d26c1b55cfca 196 #endif /* LWIP_DEBUG */
DieterGraef 0:d26c1b55cfca 197 }
DieterGraef 0:d26c1b55cfca 198
DieterGraef 0:d26c1b55cfca 199 /**
DieterGraef 0:d26c1b55cfca 200 * Clears expired entries in the ARP table.
DieterGraef 0:d26c1b55cfca 201 *
DieterGraef 0:d26c1b55cfca 202 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
DieterGraef 0:d26c1b55cfca 203 * in order to expire entries in the ARP table.
DieterGraef 0:d26c1b55cfca 204 */
DieterGraef 0:d26c1b55cfca 205 void
DieterGraef 0:d26c1b55cfca 206 etharp_tmr(void)
DieterGraef 0:d26c1b55cfca 207 {
DieterGraef 0:d26c1b55cfca 208 u8_t i;
DieterGraef 0:d26c1b55cfca 209
DieterGraef 0:d26c1b55cfca 210 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
DieterGraef 0:d26c1b55cfca 211 /* remove expired entries from the ARP table */
DieterGraef 0:d26c1b55cfca 212 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
DieterGraef 0:d26c1b55cfca 213 u8_t state = arp_table[i].state;
DieterGraef 0:d26c1b55cfca 214 if (state != ETHARP_STATE_EMPTY
DieterGraef 0:d26c1b55cfca 215 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:d26c1b55cfca 216 && (state != ETHARP_STATE_STATIC)
DieterGraef 0:d26c1b55cfca 217 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:d26c1b55cfca 218 ) {
DieterGraef 0:d26c1b55cfca 219 arp_table[i].ctime++;
DieterGraef 0:d26c1b55cfca 220 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
DieterGraef 0:d26c1b55cfca 221 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
DieterGraef 0:d26c1b55cfca 222 (arp_table[i].ctime >= ARP_MAXPENDING))) {
DieterGraef 0:d26c1b55cfca 223 /* pending or stable entry has become old! */
DieterGraef 0:d26c1b55cfca 224 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
DieterGraef 0:d26c1b55cfca 225 arp_table[i].state >= ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
DieterGraef 0:d26c1b55cfca 226 /* clean up entries that have just been expired */
DieterGraef 0:d26c1b55cfca 227 etharp_free_entry(i);
DieterGraef 0:d26c1b55cfca 228 }
DieterGraef 0:d26c1b55cfca 229 else if (arp_table[i].state == ETHARP_STATE_STABLE_REREQUESTING) {
DieterGraef 0:d26c1b55cfca 230 /* Reset state to stable, so that the next transmitted packet will
DieterGraef 0:d26c1b55cfca 231 re-send an ARP request. */
DieterGraef 0:d26c1b55cfca 232 arp_table[i].state = ETHARP_STATE_STABLE;
DieterGraef 0:d26c1b55cfca 233 }
DieterGraef 0:d26c1b55cfca 234 #if ARP_QUEUEING
DieterGraef 0:d26c1b55cfca 235 /* still pending entry? (not expired) */
DieterGraef 0:d26c1b55cfca 236 if (arp_table[i].state == ETHARP_STATE_PENDING) {
DieterGraef 0:d26c1b55cfca 237 /* resend an ARP query here? */
DieterGraef 0:d26c1b55cfca 238 }
DieterGraef 0:d26c1b55cfca 239 #endif /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 240 }
DieterGraef 0:d26c1b55cfca 241 }
DieterGraef 0:d26c1b55cfca 242 }
DieterGraef 0:d26c1b55cfca 243
DieterGraef 0:d26c1b55cfca 244 /**
DieterGraef 0:d26c1b55cfca 245 * Search the ARP table for a matching or new entry.
DieterGraef 0:d26c1b55cfca 246 *
DieterGraef 0:d26c1b55cfca 247 * If an IP address is given, return a pending or stable ARP entry that matches
DieterGraef 0:d26c1b55cfca 248 * the address. If no match is found, create a new entry with this address set,
DieterGraef 0:d26c1b55cfca 249 * but in state ETHARP_EMPTY. The caller must check and possibly change the
DieterGraef 0:d26c1b55cfca 250 * state of the returned entry.
DieterGraef 0:d26c1b55cfca 251 *
DieterGraef 0:d26c1b55cfca 252 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
DieterGraef 0:d26c1b55cfca 253 *
DieterGraef 0:d26c1b55cfca 254 * In all cases, attempt to create new entries from an empty entry. If no
DieterGraef 0:d26c1b55cfca 255 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
DieterGraef 0:d26c1b55cfca 256 * old entries. Heuristic choose the least important entry for recycling.
DieterGraef 0:d26c1b55cfca 257 *
DieterGraef 0:d26c1b55cfca 258 * @param ipaddr IP address to find in ARP cache, or to add if not found.
DieterGraef 0:d26c1b55cfca 259 * @param flags @see definition of ETHARP_FLAG_*
DieterGraef 0:d26c1b55cfca 260 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
DieterGraef 0:d26c1b55cfca 261 *
DieterGraef 0:d26c1b55cfca 262 * @return The ARP entry index that matched or is created, ERR_MEM if no
DieterGraef 0:d26c1b55cfca 263 * entry is found or could be recycled.
DieterGraef 0:d26c1b55cfca 264 */
DieterGraef 0:d26c1b55cfca 265 static s8_t
DieterGraef 0:d26c1b55cfca 266 etharp_find_entry(ip_addr_t *ipaddr, u8_t flags)
DieterGraef 0:d26c1b55cfca 267 {
DieterGraef 0:d26c1b55cfca 268 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
DieterGraef 0:d26c1b55cfca 269 s8_t empty = ARP_TABLE_SIZE;
DieterGraef 0:d26c1b55cfca 270 u8_t i = 0, age_pending = 0, age_stable = 0;
DieterGraef 0:d26c1b55cfca 271 /* oldest entry with packets on queue */
DieterGraef 0:d26c1b55cfca 272 s8_t old_queue = ARP_TABLE_SIZE;
DieterGraef 0:d26c1b55cfca 273 /* its age */
DieterGraef 0:d26c1b55cfca 274 u8_t age_queue = 0;
DieterGraef 0:d26c1b55cfca 275
DieterGraef 0:d26c1b55cfca 276 /**
DieterGraef 0:d26c1b55cfca 277 * a) do a search through the cache, remember candidates
DieterGraef 0:d26c1b55cfca 278 * b) select candidate entry
DieterGraef 0:d26c1b55cfca 279 * c) create new entry
DieterGraef 0:d26c1b55cfca 280 */
DieterGraef 0:d26c1b55cfca 281
DieterGraef 0:d26c1b55cfca 282 /* a) in a single search sweep, do all of this
DieterGraef 0:d26c1b55cfca 283 * 1) remember the first empty entry (if any)
DieterGraef 0:d26c1b55cfca 284 * 2) remember the oldest stable entry (if any)
DieterGraef 0:d26c1b55cfca 285 * 3) remember the oldest pending entry without queued packets (if any)
DieterGraef 0:d26c1b55cfca 286 * 4) remember the oldest pending entry with queued packets (if any)
DieterGraef 0:d26c1b55cfca 287 * 5) search for a matching IP entry, either pending or stable
DieterGraef 0:d26c1b55cfca 288 * until 5 matches, or all entries are searched for.
DieterGraef 0:d26c1b55cfca 289 */
DieterGraef 0:d26c1b55cfca 290
DieterGraef 0:d26c1b55cfca 291 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
DieterGraef 0:d26c1b55cfca 292 u8_t state = arp_table[i].state;
DieterGraef 0:d26c1b55cfca 293 /* no empty entry found yet and now we do find one? */
DieterGraef 0:d26c1b55cfca 294 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
DieterGraef 0:d26c1b55cfca 295 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_find_entry: found empty entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:d26c1b55cfca 296 /* remember first empty entry */
DieterGraef 0:d26c1b55cfca 297 empty = i;
DieterGraef 0:d26c1b55cfca 298 } else if (state != ETHARP_STATE_EMPTY) {
DieterGraef 0:d26c1b55cfca 299 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state >= ETHARP_STATE_STABLE",
DieterGraef 0:d26c1b55cfca 300 state == ETHARP_STATE_PENDING || state >= ETHARP_STATE_STABLE);
DieterGraef 0:d26c1b55cfca 301 /* if given, does IP address match IP address in ARP entry? */
DieterGraef 0:d26c1b55cfca 302 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
DieterGraef 0:d26c1b55cfca 303 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: found matching entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:d26c1b55cfca 304 /* found exact IP address match, simply bail out */
DieterGraef 0:d26c1b55cfca 305 return i;
DieterGraef 0:d26c1b55cfca 306 }
DieterGraef 0:d26c1b55cfca 307 /* pending entry? */
DieterGraef 0:d26c1b55cfca 308 if (state == ETHARP_STATE_PENDING) {
DieterGraef 0:d26c1b55cfca 309 /* pending with queued packets? */
DieterGraef 0:d26c1b55cfca 310 if (arp_table[i].q != NULL) {
DieterGraef 0:d26c1b55cfca 311 if (arp_table[i].ctime >= age_queue) {
DieterGraef 0:d26c1b55cfca 312 old_queue = i;
DieterGraef 0:d26c1b55cfca 313 age_queue = arp_table[i].ctime;
DieterGraef 0:d26c1b55cfca 314 }
DieterGraef 0:d26c1b55cfca 315 } else
DieterGraef 0:d26c1b55cfca 316 /* pending without queued packets? */
DieterGraef 0:d26c1b55cfca 317 {
DieterGraef 0:d26c1b55cfca 318 if (arp_table[i].ctime >= age_pending) {
DieterGraef 0:d26c1b55cfca 319 old_pending = i;
DieterGraef 0:d26c1b55cfca 320 age_pending = arp_table[i].ctime;
DieterGraef 0:d26c1b55cfca 321 }
DieterGraef 0:d26c1b55cfca 322 }
DieterGraef 0:d26c1b55cfca 323 /* stable entry? */
DieterGraef 0:d26c1b55cfca 324 } else if (state >= ETHARP_STATE_STABLE) {
DieterGraef 0:d26c1b55cfca 325 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:d26c1b55cfca 326 /* don't record old_stable for static entries since they never expire */
DieterGraef 0:d26c1b55cfca 327 if (state < ETHARP_STATE_STATIC)
DieterGraef 0:d26c1b55cfca 328 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:d26c1b55cfca 329 {
DieterGraef 0:d26c1b55cfca 330 /* remember entry with oldest stable entry in oldest, its age in maxtime */
DieterGraef 0:d26c1b55cfca 331 if (arp_table[i].ctime >= age_stable) {
DieterGraef 0:d26c1b55cfca 332 old_stable = i;
DieterGraef 0:d26c1b55cfca 333 age_stable = arp_table[i].ctime;
DieterGraef 0:d26c1b55cfca 334 }
DieterGraef 0:d26c1b55cfca 335 }
DieterGraef 0:d26c1b55cfca 336 }
DieterGraef 0:d26c1b55cfca 337 }
DieterGraef 0:d26c1b55cfca 338 }
DieterGraef 0:d26c1b55cfca 339 /* { we have no match } => try to create a new entry */
DieterGraef 0:d26c1b55cfca 340
DieterGraef 0:d26c1b55cfca 341 /* don't create new entry, only search? */
DieterGraef 0:d26c1b55cfca 342 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
DieterGraef 0:d26c1b55cfca 343 /* or no empty entry found and not allowed to recycle? */
DieterGraef 0:d26c1b55cfca 344 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
DieterGraef 0:d26c1b55cfca 345 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: no empty entry found and not allowed to recycle\n"));
DieterGraef 0:d26c1b55cfca 346 return (s8_t)ERR_MEM;
DieterGraef 0:d26c1b55cfca 347 }
DieterGraef 0:d26c1b55cfca 348
DieterGraef 0:d26c1b55cfca 349 /* b) choose the least destructive entry to recycle:
DieterGraef 0:d26c1b55cfca 350 * 1) empty entry
DieterGraef 0:d26c1b55cfca 351 * 2) oldest stable entry
DieterGraef 0:d26c1b55cfca 352 * 3) oldest pending entry without queued packets
DieterGraef 0:d26c1b55cfca 353 * 4) oldest pending entry with queued packets
DieterGraef 0:d26c1b55cfca 354 *
DieterGraef 0:d26c1b55cfca 355 * { ETHARP_FLAG_TRY_HARD is set at this point }
DieterGraef 0:d26c1b55cfca 356 */
DieterGraef 0:d26c1b55cfca 357
DieterGraef 0:d26c1b55cfca 358 /* 1) empty entry available? */
DieterGraef 0:d26c1b55cfca 359 if (empty < ARP_TABLE_SIZE) {
DieterGraef 0:d26c1b55cfca 360 i = empty;
DieterGraef 0:d26c1b55cfca 361 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:d26c1b55cfca 362 } else {
DieterGraef 0:d26c1b55cfca 363 /* 2) found recyclable stable entry? */
DieterGraef 0:d26c1b55cfca 364 if (old_stable < ARP_TABLE_SIZE) {
DieterGraef 0:d26c1b55cfca 365 /* recycle oldest stable*/
DieterGraef 0:d26c1b55cfca 366 i = old_stable;
DieterGraef 0:d26c1b55cfca 367 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
DieterGraef 0:d26c1b55cfca 368 /* no queued packets should exist on stable entries */
DieterGraef 0:d26c1b55cfca 369 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
DieterGraef 0:d26c1b55cfca 370 /* 3) found recyclable pending entry without queued packets? */
DieterGraef 0:d26c1b55cfca 371 } else if (old_pending < ARP_TABLE_SIZE) {
DieterGraef 0:d26c1b55cfca 372 /* recycle oldest pending */
DieterGraef 0:d26c1b55cfca 373 i = old_pending;
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 375 /* 4) found recyclable pending entry with queued packets? */
DieterGraef 0:d26c1b55cfca 376 } else if (old_queue < ARP_TABLE_SIZE) {
DieterGraef 0:d26c1b55cfca 377 /* recycle oldest pending (queued packets are free in etharp_free_entry) */
DieterGraef 0:d26c1b55cfca 378 i = old_queue;
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 380 /* no empty or recyclable entries found */
DieterGraef 0:d26c1b55cfca 381 } else {
DieterGraef 0:d26c1b55cfca 382 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_find_entry: no empty or recyclable entries found\n"));
DieterGraef 0:d26c1b55cfca 383 return (s8_t)ERR_MEM;
DieterGraef 0:d26c1b55cfca 384 }
DieterGraef 0:d26c1b55cfca 385
DieterGraef 0:d26c1b55cfca 386 /* { empty or recyclable entry found } */
DieterGraef 0:d26c1b55cfca 387 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
DieterGraef 0:d26c1b55cfca 388 etharp_free_entry(i);
DieterGraef 0:d26c1b55cfca 389 }
DieterGraef 0:d26c1b55cfca 390
DieterGraef 0:d26c1b55cfca 391 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
DieterGraef 0:d26c1b55cfca 392 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
DieterGraef 0:d26c1b55cfca 393 arp_table[i].state == ETHARP_STATE_EMPTY);
DieterGraef 0:d26c1b55cfca 394
DieterGraef 0:d26c1b55cfca 395 /* IP address given? */
DieterGraef 0:d26c1b55cfca 396 if (ipaddr != NULL) {
DieterGraef 0:d26c1b55cfca 397 /* set IP address */
DieterGraef 0:d26c1b55cfca 398 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
DieterGraef 0:d26c1b55cfca 399 }
DieterGraef 0:d26c1b55cfca 400 arp_table[i].ctime = 0;
DieterGraef 0:d26c1b55cfca 401 return (err_t)i;
DieterGraef 0:d26c1b55cfca 402 }
DieterGraef 0:d26c1b55cfca 403
DieterGraef 0:d26c1b55cfca 404 /**
DieterGraef 0:d26c1b55cfca 405 * Send an IP packet on the network using netif->linkoutput
DieterGraef 0:d26c1b55cfca 406 * The ethernet header is filled in before sending.
DieterGraef 0:d26c1b55cfca 407 *
DieterGraef 0:d26c1b55cfca 408 * @params netif the lwIP network interface on which to send the packet
DieterGraef 0:d26c1b55cfca 409 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
DieterGraef 0:d26c1b55cfca 410 * @params src the source MAC address to be copied into the ethernet header
DieterGraef 0:d26c1b55cfca 411 * @params dst the destination MAC address to be copied into the ethernet header
DieterGraef 0:d26c1b55cfca 412 * @return ERR_OK if the packet was sent, any other err_t on failure
DieterGraef 0:d26c1b55cfca 413 */
DieterGraef 0:d26c1b55cfca 414 static err_t
DieterGraef 0:d26c1b55cfca 415 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
DieterGraef 0:d26c1b55cfca 416 {
DieterGraef 0:d26c1b55cfca 417 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:d26c1b55cfca 418
DieterGraef 0:d26c1b55cfca 419 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
DieterGraef 0:d26c1b55cfca 420 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
DieterGraef 0:d26c1b55cfca 421 ETHADDR32_COPY(&ethhdr->dest, dst);
DieterGraef 0:d26c1b55cfca 422 ETHADDR16_COPY(&ethhdr->src, src);
DieterGraef 0:d26c1b55cfca 423 ethhdr->type = PP_HTONS(ETHTYPE_IP);
DieterGraef 0:d26c1b55cfca 424 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
DieterGraef 0:d26c1b55cfca 425 /* send the packet */
DieterGraef 0:d26c1b55cfca 426 return netif->linkoutput(netif, p);
DieterGraef 0:d26c1b55cfca 427 }
DieterGraef 0:d26c1b55cfca 428
DieterGraef 0:d26c1b55cfca 429 /**
DieterGraef 0:d26c1b55cfca 430 * Update (or insert) a IP/MAC address pair in the ARP cache.
DieterGraef 0:d26c1b55cfca 431 *
DieterGraef 0:d26c1b55cfca 432 * If a pending entry is resolved, any queued packets will be sent
DieterGraef 0:d26c1b55cfca 433 * at this point.
DieterGraef 0:d26c1b55cfca 434 *
DieterGraef 0:d26c1b55cfca 435 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
DieterGraef 0:d26c1b55cfca 436 * @param ipaddr IP address of the inserted ARP entry.
DieterGraef 0:d26c1b55cfca 437 * @param ethaddr Ethernet address of the inserted ARP entry.
DieterGraef 0:d26c1b55cfca 438 * @param flags @see definition of ETHARP_FLAG_*
DieterGraef 0:d26c1b55cfca 439 *
DieterGraef 0:d26c1b55cfca 440 * @return
DieterGraef 0:d26c1b55cfca 441 * - ERR_OK Succesfully updated ARP cache.
DieterGraef 0:d26c1b55cfca 442 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
DieterGraef 0:d26c1b55cfca 443 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
DieterGraef 0:d26c1b55cfca 444 *
DieterGraef 0:d26c1b55cfca 445 * @see pbuf_free()
DieterGraef 0:d26c1b55cfca 446 */
DieterGraef 0:d26c1b55cfca 447 static err_t
DieterGraef 0:d26c1b55cfca 448 etharp_update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
DieterGraef 0:d26c1b55cfca 449 {
DieterGraef 0:d26c1b55cfca 450 s8_t i;
DieterGraef 0:d26c1b55cfca 451 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 453 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
DieterGraef 0:d26c1b55cfca 454 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
DieterGraef 0:d26c1b55cfca 455 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
DieterGraef 0:d26c1b55cfca 456 /* non-unicast address? */
DieterGraef 0:d26c1b55cfca 457 if (ip_addr_isany(ipaddr) ||
DieterGraef 0:d26c1b55cfca 458 ip_addr_isbroadcast(ipaddr, netif) ||
DieterGraef 0:d26c1b55cfca 459 ip_addr_ismulticast(ipaddr)) {
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 461 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 462 }
DieterGraef 0:d26c1b55cfca 463 /* find or create ARP entry */
DieterGraef 0:d26c1b55cfca 464 i = etharp_find_entry(ipaddr, flags);
DieterGraef 0:d26c1b55cfca 465 /* bail out if no entry could be found */
DieterGraef 0:d26c1b55cfca 466 if (i < 0) {
DieterGraef 0:d26c1b55cfca 467 return (err_t)i;
DieterGraef 0:d26c1b55cfca 468 }
DieterGraef 0:d26c1b55cfca 469
DieterGraef 0:d26c1b55cfca 470 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:d26c1b55cfca 471 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
DieterGraef 0:d26c1b55cfca 472 /* record static type */
DieterGraef 0:d26c1b55cfca 473 arp_table[i].state = ETHARP_STATE_STATIC;
DieterGraef 0:d26c1b55cfca 474 } else
DieterGraef 0:d26c1b55cfca 475 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:d26c1b55cfca 476 {
DieterGraef 0:d26c1b55cfca 477 /* mark it stable */
DieterGraef 0:d26c1b55cfca 478 arp_table[i].state = ETHARP_STATE_STABLE;
DieterGraef 0:d26c1b55cfca 479 }
DieterGraef 0:d26c1b55cfca 480
DieterGraef 0:d26c1b55cfca 481 /* record network interface */
DieterGraef 0:d26c1b55cfca 482 arp_table[i].netif = netif;
DieterGraef 0:d26c1b55cfca 483 /* insert in SNMP ARP index tree */
DieterGraef 0:d26c1b55cfca 484 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
DieterGraef 0:d26c1b55cfca 485
DieterGraef 0:d26c1b55cfca 486 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
DieterGraef 0:d26c1b55cfca 487 /* update address */
DieterGraef 0:d26c1b55cfca 488 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
DieterGraef 0:d26c1b55cfca 489 /* reset time stamp */
DieterGraef 0:d26c1b55cfca 490 arp_table[i].ctime = 0;
DieterGraef 0:d26c1b55cfca 491 /* this is where we will send out queued packets! */
DieterGraef 0:d26c1b55cfca 492 #if ARP_QUEUEING
DieterGraef 0:d26c1b55cfca 493 while (arp_table[i].q != NULL) {
DieterGraef 0:d26c1b55cfca 494 struct pbuf *p;
DieterGraef 0:d26c1b55cfca 495 /* remember remainder of queue */
DieterGraef 0:d26c1b55cfca 496 struct etharp_q_entry *q = arp_table[i].q;
DieterGraef 0:d26c1b55cfca 497 /* pop first item off the queue */
DieterGraef 0:d26c1b55cfca 498 arp_table[i].q = q->next;
DieterGraef 0:d26c1b55cfca 499 /* get the packet pointer */
DieterGraef 0:d26c1b55cfca 500 p = q->p;
DieterGraef 0:d26c1b55cfca 501 /* now queue entry can be freed */
DieterGraef 0:d26c1b55cfca 502 memp_free(MEMP_ARP_QUEUE, q);
DieterGraef 0:d26c1b55cfca 503 #else /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 504 if (arp_table[i].q != NULL) {
DieterGraef 0:d26c1b55cfca 505 struct pbuf *p = arp_table[i].q;
DieterGraef 0:d26c1b55cfca 506 arp_table[i].q = NULL;
DieterGraef 0:d26c1b55cfca 507 #endif /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 508 /* send the queued IP packet */
DieterGraef 0:d26c1b55cfca 509 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
DieterGraef 0:d26c1b55cfca 510 /* free the queued IP packet */
DieterGraef 0:d26c1b55cfca 511 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 512 }
DieterGraef 0:d26c1b55cfca 513 return ERR_OK;
DieterGraef 0:d26c1b55cfca 514 }
DieterGraef 0:d26c1b55cfca 515
DieterGraef 0:d26c1b55cfca 516 #if ETHARP_SUPPORT_STATIC_ENTRIES
DieterGraef 0:d26c1b55cfca 517 /** Add a new static entry to the ARP table. If an entry exists for the
DieterGraef 0:d26c1b55cfca 518 * specified IP address, this entry is overwritten.
DieterGraef 0:d26c1b55cfca 519 * If packets are queued for the specified IP address, they are sent out.
DieterGraef 0:d26c1b55cfca 520 *
DieterGraef 0:d26c1b55cfca 521 * @param ipaddr IP address for the new static entry
DieterGraef 0:d26c1b55cfca 522 * @param ethaddr ethernet address for the new static entry
DieterGraef 0:d26c1b55cfca 523 * @return @see return values of etharp_add_static_entry
DieterGraef 0:d26c1b55cfca 524 */
DieterGraef 0:d26c1b55cfca 525 err_t
DieterGraef 0:d26c1b55cfca 526 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
DieterGraef 0:d26c1b55cfca 527 {
DieterGraef 0:d26c1b55cfca 528 struct netif *netif;
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 530 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
DieterGraef 0:d26c1b55cfca 531 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
DieterGraef 0:d26c1b55cfca 532 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
DieterGraef 0:d26c1b55cfca 533
DieterGraef 0:d26c1b55cfca 534 netif = ip_route(ipaddr);
DieterGraef 0:d26c1b55cfca 535 if (netif == NULL) {
DieterGraef 0:d26c1b55cfca 536 return ERR_RTE;
DieterGraef 0:d26c1b55cfca 537 }
DieterGraef 0:d26c1b55cfca 538
DieterGraef 0:d26c1b55cfca 539 return etharp_update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
DieterGraef 0:d26c1b55cfca 540 }
DieterGraef 0:d26c1b55cfca 541
DieterGraef 0:d26c1b55cfca 542 /** Remove a static entry from the ARP table previously added with a call to
DieterGraef 0:d26c1b55cfca 543 * etharp_add_static_entry.
DieterGraef 0:d26c1b55cfca 544 *
DieterGraef 0:d26c1b55cfca 545 * @param ipaddr IP address of the static entry to remove
DieterGraef 0:d26c1b55cfca 546 * @return ERR_OK: entry removed
DieterGraef 0:d26c1b55cfca 547 * ERR_MEM: entry wasn't found
DieterGraef 0:d26c1b55cfca 548 * ERR_ARG: entry wasn't a static entry but a dynamic one
DieterGraef 0:d26c1b55cfca 549 */
DieterGraef 0:d26c1b55cfca 550 err_t
DieterGraef 0:d26c1b55cfca 551 etharp_remove_static_entry(ip_addr_t *ipaddr)
DieterGraef 0:d26c1b55cfca 552 {
DieterGraef 0:d26c1b55cfca 553 s8_t i;
DieterGraef 0:d26c1b55cfca 554 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
DieterGraef 0:d26c1b55cfca 555 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
DieterGraef 0:d26c1b55cfca 556
DieterGraef 0:d26c1b55cfca 557 /* find or create ARP entry */
DieterGraef 0:d26c1b55cfca 558 i = etharp_find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:d26c1b55cfca 559 /* bail out if no entry could be found */
DieterGraef 0:d26c1b55cfca 560 if (i < 0) {
DieterGraef 0:d26c1b55cfca 561 return (err_t)i;
DieterGraef 0:d26c1b55cfca 562 }
DieterGraef 0:d26c1b55cfca 563
DieterGraef 0:d26c1b55cfca 564 if (arp_table[i].state != ETHARP_STATE_STATIC) {
DieterGraef 0:d26c1b55cfca 565 /* entry wasn't a static entry, cannot remove it */
DieterGraef 0:d26c1b55cfca 566 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 567 }
DieterGraef 0:d26c1b55cfca 568 /* entry found, free it */
DieterGraef 0:d26c1b55cfca 569 etharp_free_entry(i);
DieterGraef 0:d26c1b55cfca 570 return ERR_OK;
DieterGraef 0:d26c1b55cfca 571 }
DieterGraef 0:d26c1b55cfca 572 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
DieterGraef 0:d26c1b55cfca 573
DieterGraef 0:d26c1b55cfca 574 /**
DieterGraef 0:d26c1b55cfca 575 * Remove all ARP table entries of the specified netif.
DieterGraef 0:d26c1b55cfca 576 *
DieterGraef 0:d26c1b55cfca 577 * @param netif points to a network interface
DieterGraef 0:d26c1b55cfca 578 */
DieterGraef 0:d26c1b55cfca 579 void etharp_cleanup_netif(struct netif *netif)
DieterGraef 0:d26c1b55cfca 580 {
DieterGraef 0:d26c1b55cfca 581 u8_t i;
DieterGraef 0:d26c1b55cfca 582
DieterGraef 0:d26c1b55cfca 583 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
DieterGraef 0:d26c1b55cfca 584 u8_t state = arp_table[i].state;
DieterGraef 0:d26c1b55cfca 585 if ((state != ETHARP_STATE_EMPTY) && (arp_table[i].netif == netif)) {
DieterGraef 0:d26c1b55cfca 586 etharp_free_entry(i);
DieterGraef 0:d26c1b55cfca 587 }
DieterGraef 0:d26c1b55cfca 588 }
DieterGraef 0:d26c1b55cfca 589 }
DieterGraef 0:d26c1b55cfca 590
DieterGraef 0:d26c1b55cfca 591 /**
DieterGraef 0:d26c1b55cfca 592 * Finds (stable) ethernet/IP address pair from ARP table
DieterGraef 0:d26c1b55cfca 593 * using interface and IP address index.
DieterGraef 0:d26c1b55cfca 594 * @note the addresses in the ARP table are in network order!
DieterGraef 0:d26c1b55cfca 595 *
DieterGraef 0:d26c1b55cfca 596 * @param netif points to interface index
DieterGraef 0:d26c1b55cfca 597 * @param ipaddr points to the (network order) IP address index
DieterGraef 0:d26c1b55cfca 598 * @param eth_ret points to return pointer
DieterGraef 0:d26c1b55cfca 599 * @param ip_ret points to return pointer
DieterGraef 0:d26c1b55cfca 600 * @return table index if found, -1 otherwise
DieterGraef 0:d26c1b55cfca 601 */
DieterGraef 0:d26c1b55cfca 602 s8_t
DieterGraef 0:d26c1b55cfca 603 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
DieterGraef 0:d26c1b55cfca 604 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
DieterGraef 0:d26c1b55cfca 605 {
DieterGraef 0:d26c1b55cfca 606 s8_t i;
DieterGraef 0:d26c1b55cfca 607
DieterGraef 0:d26c1b55cfca 608 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
DieterGraef 0:d26c1b55cfca 609 eth_ret != NULL && ip_ret != NULL);
DieterGraef 0:d26c1b55cfca 610
DieterGraef 0:d26c1b55cfca 611 LWIP_UNUSED_ARG(netif);
DieterGraef 0:d26c1b55cfca 612
DieterGraef 0:d26c1b55cfca 613 i = etharp_find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:d26c1b55cfca 614 if((i >= 0) && (arp_table[i].state >= ETHARP_STATE_STABLE)) {
DieterGraef 0:d26c1b55cfca 615 *eth_ret = &arp_table[i].ethaddr;
DieterGraef 0:d26c1b55cfca 616 *ip_ret = &arp_table[i].ipaddr;
DieterGraef 0:d26c1b55cfca 617 return i;
DieterGraef 0:d26c1b55cfca 618 }
DieterGraef 0:d26c1b55cfca 619 return -1;
DieterGraef 0:d26c1b55cfca 620 }
DieterGraef 0:d26c1b55cfca 621
DieterGraef 0:d26c1b55cfca 622 #if ETHARP_TRUST_IP_MAC
DieterGraef 0:d26c1b55cfca 623 /**
DieterGraef 0:d26c1b55cfca 624 * Updates the ARP table using the given IP packet.
DieterGraef 0:d26c1b55cfca 625 *
DieterGraef 0:d26c1b55cfca 626 * Uses the incoming IP packet's source address to update the
DieterGraef 0:d26c1b55cfca 627 * ARP cache for the local network. The function does not alter
DieterGraef 0:d26c1b55cfca 628 * or free the packet. This function must be called before the
DieterGraef 0:d26c1b55cfca 629 * packet p is passed to the IP layer.
DieterGraef 0:d26c1b55cfca 630 *
DieterGraef 0:d26c1b55cfca 631 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
DieterGraef 0:d26c1b55cfca 632 * @param p The IP packet that arrived on netif.
DieterGraef 0:d26c1b55cfca 633 *
DieterGraef 0:d26c1b55cfca 634 * @return NULL
DieterGraef 0:d26c1b55cfca 635 *
DieterGraef 0:d26c1b55cfca 636 * @see pbuf_free()
DieterGraef 0:d26c1b55cfca 637 */
DieterGraef 0:d26c1b55cfca 638 static void
DieterGraef 0:d26c1b55cfca 639 etharp_ip_input(struct netif *netif, struct pbuf *p)
DieterGraef 0:d26c1b55cfca 640 {
DieterGraef 0:d26c1b55cfca 641 struct eth_hdr *ethhdr;
DieterGraef 0:d26c1b55cfca 642 struct ip_hdr *iphdr;
DieterGraef 0:d26c1b55cfca 643 ip_addr_t iphdr_src;
DieterGraef 0:d26c1b55cfca 644 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
DieterGraef 0:d26c1b55cfca 645
DieterGraef 0:d26c1b55cfca 646 /* Only insert an entry if the source IP address of the
DieterGraef 0:d26c1b55cfca 647 incoming IP packet comes from a host on the local network. */
DieterGraef 0:d26c1b55cfca 648 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:d26c1b55cfca 649 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
DieterGraef 0:d26c1b55cfca 650 #if ETHARP_SUPPORT_VLAN
DieterGraef 0:d26c1b55cfca 651 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
DieterGraef 0:d26c1b55cfca 652 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
DieterGraef 0:d26c1b55cfca 653 }
DieterGraef 0:d26c1b55cfca 654 #endif /* ETHARP_SUPPORT_VLAN */
DieterGraef 0:d26c1b55cfca 655
DieterGraef 0:d26c1b55cfca 656 ip_addr_copy(iphdr_src, iphdr->src);
DieterGraef 0:d26c1b55cfca 657
DieterGraef 0:d26c1b55cfca 658 /* source is not on the local network? */
DieterGraef 0:d26c1b55cfca 659 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
DieterGraef 0:d26c1b55cfca 660 /* do nothing */
DieterGraef 0:d26c1b55cfca 661 return;
DieterGraef 0:d26c1b55cfca 662 }
DieterGraef 0:d26c1b55cfca 663
DieterGraef 0:d26c1b55cfca 664 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
DieterGraef 0:d26c1b55cfca 665 /* update the source IP address in the cache, if present */
DieterGraef 0:d26c1b55cfca 666 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
DieterGraef 0:d26c1b55cfca 667 * back soon (for example, if the destination IP address is ours. */
DieterGraef 0:d26c1b55cfca 668 etharp_update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:d26c1b55cfca 669 }
DieterGraef 0:d26c1b55cfca 670 #endif /* ETHARP_TRUST_IP_MAC */
DieterGraef 0:d26c1b55cfca 671
DieterGraef 0:d26c1b55cfca 672 /**
DieterGraef 0:d26c1b55cfca 673 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
DieterGraef 0:d26c1b55cfca 674 * send out queued IP packets. Updates cache with snooped address pairs.
DieterGraef 0:d26c1b55cfca 675 *
DieterGraef 0:d26c1b55cfca 676 * Should be called for incoming ARP packets. The pbuf in the argument
DieterGraef 0:d26c1b55cfca 677 * is freed by this function.
DieterGraef 0:d26c1b55cfca 678 *
DieterGraef 0:d26c1b55cfca 679 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
DieterGraef 0:d26c1b55cfca 680 * @param ethaddr Ethernet address of netif.
DieterGraef 0:d26c1b55cfca 681 * @param p The ARP packet that arrived on netif. Is freed by this function.
DieterGraef 0:d26c1b55cfca 682 *
DieterGraef 0:d26c1b55cfca 683 * @return NULL
DieterGraef 0:d26c1b55cfca 684 *
DieterGraef 0:d26c1b55cfca 685 * @see pbuf_free()
DieterGraef 0:d26c1b55cfca 686 */
DieterGraef 0:d26c1b55cfca 687 static void
DieterGraef 0:d26c1b55cfca 688 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
DieterGraef 0:d26c1b55cfca 689 {
DieterGraef 0:d26c1b55cfca 690 struct etharp_hdr *hdr;
DieterGraef 0:d26c1b55cfca 691 struct eth_hdr *ethhdr;
DieterGraef 0:d26c1b55cfca 692 /* these are aligned properly, whereas the ARP header fields might not be */
DieterGraef 0:d26c1b55cfca 693 ip_addr_t sipaddr, dipaddr;
DieterGraef 0:d26c1b55cfca 694 u8_t for_us;
DieterGraef 0:d26c1b55cfca 695 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 696 const u8_t * ethdst_hwaddr;
DieterGraef 0:d26c1b55cfca 697 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 698
DieterGraef 0:d26c1b55cfca 699 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
DieterGraef 0:d26c1b55cfca 700
DieterGraef 0:d26c1b55cfca 701 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
DieterGraef 0:d26c1b55cfca 702 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
DieterGraef 0:d26c1b55cfca 703 if (p->len < SIZEOF_ETHARP_PACKET) {
DieterGraef 0:d26c1b55cfca 704 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
DieterGraef 0:d26c1b55cfca 705 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
DieterGraef 0:d26c1b55cfca 706 (s16_t)SIZEOF_ETHARP_PACKET));
DieterGraef 0:d26c1b55cfca 707 ETHARP_STATS_INC(etharp.lenerr);
DieterGraef 0:d26c1b55cfca 708 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:d26c1b55cfca 709 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 710 return;
DieterGraef 0:d26c1b55cfca 711 }
DieterGraef 0:d26c1b55cfca 712
DieterGraef 0:d26c1b55cfca 713 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:d26c1b55cfca 714 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
DieterGraef 0:d26c1b55cfca 715 #if ETHARP_SUPPORT_VLAN
DieterGraef 0:d26c1b55cfca 716 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
DieterGraef 0:d26c1b55cfca 717 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
DieterGraef 0:d26c1b55cfca 718 }
DieterGraef 0:d26c1b55cfca 719 #endif /* ETHARP_SUPPORT_VLAN */
DieterGraef 0:d26c1b55cfca 720
DieterGraef 0:d26c1b55cfca 721 /* RFC 826 "Packet Reception": */
DieterGraef 0:d26c1b55cfca 722 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
DieterGraef 0:d26c1b55cfca 723 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
DieterGraef 0:d26c1b55cfca 724 (hdr->protolen != sizeof(ip_addr_t)) ||
DieterGraef 0:d26c1b55cfca 725 (hdr->proto != PP_HTONS(ETHTYPE_IP))) {
DieterGraef 0:d26c1b55cfca 726 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 728 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen));
DieterGraef 0:d26c1b55cfca 729 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:d26c1b55cfca 730 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:d26c1b55cfca 731 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 732 return;
DieterGraef 0:d26c1b55cfca 733 }
DieterGraef 0:d26c1b55cfca 734 ETHARP_STATS_INC(etharp.recv);
DieterGraef 0:d26c1b55cfca 735
DieterGraef 0:d26c1b55cfca 736 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 737 /* We have to check if a host already has configured our random
DieterGraef 0:d26c1b55cfca 738 * created link local address and continously check if there is
DieterGraef 0:d26c1b55cfca 739 * a host with this IP-address so we can detect collisions */
DieterGraef 0:d26c1b55cfca 740 autoip_arp_reply(netif, hdr);
DieterGraef 0:d26c1b55cfca 741 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 742
DieterGraef 0:d26c1b55cfca 743 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
DieterGraef 0:d26c1b55cfca 744 * structure packing (not using structure copy which breaks strict-aliasing rules). */
DieterGraef 0:d26c1b55cfca 745 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
DieterGraef 0:d26c1b55cfca 746 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
DieterGraef 0:d26c1b55cfca 747
DieterGraef 0:d26c1b55cfca 748 /* this interface is not configured? */
DieterGraef 0:d26c1b55cfca 749 if (ip_addr_isany(&netif->ip_addr)) {
DieterGraef 0:d26c1b55cfca 750 for_us = 0;
DieterGraef 0:d26c1b55cfca 751 } else {
DieterGraef 0:d26c1b55cfca 752 /* ARP packet directed to us? */
DieterGraef 0:d26c1b55cfca 753 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
DieterGraef 0:d26c1b55cfca 754 }
DieterGraef 0:d26c1b55cfca 755
DieterGraef 0:d26c1b55cfca 756 /* ARP message directed to us?
DieterGraef 0:d26c1b55cfca 757 -> add IP address in ARP cache; assume requester wants to talk to us,
DieterGraef 0:d26c1b55cfca 758 can result in directly sending the queued packets for this host.
DieterGraef 0:d26c1b55cfca 759 ARP message not directed to us?
DieterGraef 0:d26c1b55cfca 760 -> update the source IP address in the cache, if present */
DieterGraef 0:d26c1b55cfca 761 etharp_update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
DieterGraef 0:d26c1b55cfca 762 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
DieterGraef 0:d26c1b55cfca 763
DieterGraef 0:d26c1b55cfca 764 /* now act on the message itself */
DieterGraef 0:d26c1b55cfca 765 switch (hdr->opcode) {
DieterGraef 0:d26c1b55cfca 766 /* ARP request? */
DieterGraef 0:d26c1b55cfca 767 case PP_HTONS(ARP_REQUEST):
DieterGraef 0:d26c1b55cfca 768 /* ARP request. If it asked for our address, we send out a
DieterGraef 0:d26c1b55cfca 769 * reply. In any case, we time-stamp any existing ARP entry,
DieterGraef 0:d26c1b55cfca 770 * and possiby send out an IP packet that was queued on it. */
DieterGraef 0:d26c1b55cfca 771
DieterGraef 0:d26c1b55cfca 772 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
DieterGraef 0:d26c1b55cfca 773 /* ARP request for our address? */
DieterGraef 0:d26c1b55cfca 774 if (for_us) {
DieterGraef 0:d26c1b55cfca 775
DieterGraef 0:d26c1b55cfca 776 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
DieterGraef 0:d26c1b55cfca 777 /* Re-use pbuf to send ARP reply.
DieterGraef 0:d26c1b55cfca 778 Since we are re-using an existing pbuf, we can't call etharp_raw since
DieterGraef 0:d26c1b55cfca 779 that would allocate a new pbuf. */
DieterGraef 0:d26c1b55cfca 780 hdr->opcode = htons(ARP_REPLY);
DieterGraef 0:d26c1b55cfca 781
DieterGraef 0:d26c1b55cfca 782 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
DieterGraef 0:d26c1b55cfca 783 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
DieterGraef 0:d26c1b55cfca 784
DieterGraef 0:d26c1b55cfca 785 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
DieterGraef 0:d26c1b55cfca 786 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
DieterGraef 0:d26c1b55cfca 787 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 788 /* If we are using Link-Local, all ARP packets that contain a Link-Local
DieterGraef 0:d26c1b55cfca 789 * 'sender IP address' MUST be sent using link-layer broadcast instead of
DieterGraef 0:d26c1b55cfca 790 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
DieterGraef 0:d26c1b55cfca 791 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
DieterGraef 0:d26c1b55cfca 792 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 793
DieterGraef 0:d26c1b55cfca 794 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
DieterGraef 0:d26c1b55cfca 795 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 796 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
DieterGraef 0:d26c1b55cfca 797 #else /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 798 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
DieterGraef 0:d26c1b55cfca 799 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 800 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
DieterGraef 0:d26c1b55cfca 801 ETHADDR16_COPY(&ethhdr->src, ethaddr);
DieterGraef 0:d26c1b55cfca 802
DieterGraef 0:d26c1b55cfca 803 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
DieterGraef 0:d26c1b55cfca 804 are already correct, we tested that before */
DieterGraef 0:d26c1b55cfca 805
DieterGraef 0:d26c1b55cfca 806 /* return ARP reply */
DieterGraef 0:d26c1b55cfca 807 netif->linkoutput(netif, p);
DieterGraef 0:d26c1b55cfca 808 /* we are not configured? */
DieterGraef 0:d26c1b55cfca 809 } else if (ip_addr_isany(&netif->ip_addr)) {
DieterGraef 0:d26c1b55cfca 810 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
DieterGraef 0:d26c1b55cfca 811 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
DieterGraef 0:d26c1b55cfca 812 /* request was not directed to us */
DieterGraef 0:d26c1b55cfca 813 } else {
DieterGraef 0:d26c1b55cfca 814 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
DieterGraef 0:d26c1b55cfca 815 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
DieterGraef 0:d26c1b55cfca 816 }
DieterGraef 0:d26c1b55cfca 817 break;
DieterGraef 0:d26c1b55cfca 818 case PP_HTONS(ARP_REPLY):
DieterGraef 0:d26c1b55cfca 819 /* ARP reply. We already updated the ARP cache earlier. */
DieterGraef 0:d26c1b55cfca 820 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
DieterGraef 0:d26c1b55cfca 821 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
DieterGraef 0:d26c1b55cfca 822 /* DHCP wants to know about ARP replies from any host with an
DieterGraef 0:d26c1b55cfca 823 * IP address also offered to us by the DHCP server. We do not
DieterGraef 0:d26c1b55cfca 824 * want to take a duplicate IP address on a single network.
DieterGraef 0:d26c1b55cfca 825 * @todo How should we handle redundant (fail-over) interfaces? */
DieterGraef 0:d26c1b55cfca 826 dhcp_arp_reply(netif, &sipaddr);
DieterGraef 0:d26c1b55cfca 827 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
DieterGraef 0:d26c1b55cfca 828 break;
DieterGraef 0:d26c1b55cfca 829 default:
DieterGraef 0:d26c1b55cfca 830 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
DieterGraef 0:d26c1b55cfca 831 ETHARP_STATS_INC(etharp.err);
DieterGraef 0:d26c1b55cfca 832 break;
DieterGraef 0:d26c1b55cfca 833 }
DieterGraef 0:d26c1b55cfca 834 /* free ARP packet */
DieterGraef 0:d26c1b55cfca 835 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 836 }
DieterGraef 0:d26c1b55cfca 837
DieterGraef 0:d26c1b55cfca 838 /** Just a small helper function that sends a pbuf to an ethernet address
DieterGraef 0:d26c1b55cfca 839 * in the arp_table specified by the index 'arp_idx'.
DieterGraef 0:d26c1b55cfca 840 */
DieterGraef 0:d26c1b55cfca 841 static err_t
DieterGraef 0:d26c1b55cfca 842 etharp_output_to_arp_index(struct netif *netif, struct pbuf *q, u8_t arp_idx)
DieterGraef 0:d26c1b55cfca 843 {
DieterGraef 0:d26c1b55cfca 844 LWIP_ASSERT("arp_table[arp_idx].state >= ETHARP_STATE_STABLE",
DieterGraef 0:d26c1b55cfca 845 arp_table[arp_idx].state >= ETHARP_STATE_STABLE);
DieterGraef 0:d26c1b55cfca 846 /* if arp table entry is about to expire: re-request it,
DieterGraef 0:d26c1b55cfca 847 but only if its state is ETHARP_STATE_STABLE to prevent flooding the
DieterGraef 0:d26c1b55cfca 848 network with ARP requests if this address is used frequently. */
DieterGraef 0:d26c1b55cfca 849 if ((arp_table[arp_idx].state == ETHARP_STATE_STABLE) &&
DieterGraef 0:d26c1b55cfca 850 (arp_table[arp_idx].ctime >= ARP_AGE_REREQUEST_USED)) {
DieterGraef 0:d26c1b55cfca 851 if (etharp_request(netif, &arp_table[arp_idx].ipaddr) == ERR_OK) {
DieterGraef 0:d26c1b55cfca 852 arp_table[arp_idx].state = ETHARP_STATE_STABLE_REREQUESTING;
DieterGraef 0:d26c1b55cfca 853 }
DieterGraef 0:d26c1b55cfca 854 }
DieterGraef 0:d26c1b55cfca 855
DieterGraef 0:d26c1b55cfca 856 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
DieterGraef 0:d26c1b55cfca 857 &arp_table[arp_idx].ethaddr);
DieterGraef 0:d26c1b55cfca 858 }
DieterGraef 0:d26c1b55cfca 859
DieterGraef 0:d26c1b55cfca 860 /**
DieterGraef 0:d26c1b55cfca 861 * Resolve and fill-in Ethernet address header for outgoing IP packet.
DieterGraef 0:d26c1b55cfca 862 *
DieterGraef 0:d26c1b55cfca 863 * For IP multicast and broadcast, corresponding Ethernet addresses
DieterGraef 0:d26c1b55cfca 864 * are selected and the packet is transmitted on the link.
DieterGraef 0:d26c1b55cfca 865 *
DieterGraef 0:d26c1b55cfca 866 * For unicast addresses, the packet is submitted to etharp_query(). In
DieterGraef 0:d26c1b55cfca 867 * case the IP address is outside the local network, the IP address of
DieterGraef 0:d26c1b55cfca 868 * the gateway is used.
DieterGraef 0:d26c1b55cfca 869 *
DieterGraef 0:d26c1b55cfca 870 * @param netif The lwIP network interface which the IP packet will be sent on.
DieterGraef 0:d26c1b55cfca 871 * @param q The pbuf(s) containing the IP packet to be sent.
DieterGraef 0:d26c1b55cfca 872 * @param ipaddr The IP address of the packet destination.
DieterGraef 0:d26c1b55cfca 873 *
DieterGraef 0:d26c1b55cfca 874 * @return
DieterGraef 0:d26c1b55cfca 875 * - ERR_RTE No route to destination (no gateway to external networks),
DieterGraef 0:d26c1b55cfca 876 * or the return type of either etharp_query() or etharp_send_ip().
DieterGraef 0:d26c1b55cfca 877 */
DieterGraef 0:d26c1b55cfca 878 err_t
DieterGraef 0:d26c1b55cfca 879 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
DieterGraef 0:d26c1b55cfca 880 {
DieterGraef 0:d26c1b55cfca 881 struct eth_addr *dest;
DieterGraef 0:d26c1b55cfca 882 struct eth_addr mcastaddr;
DieterGraef 0:d26c1b55cfca 883 ip_addr_t *dst_addr = ipaddr;
DieterGraef 0:d26c1b55cfca 884
DieterGraef 0:d26c1b55cfca 885 LWIP_ASSERT("netif != NULL", netif != NULL);
DieterGraef 0:d26c1b55cfca 886 LWIP_ASSERT("q != NULL", q != NULL);
DieterGraef 0:d26c1b55cfca 887 LWIP_ASSERT("ipaddr != NULL", ipaddr != NULL);
DieterGraef 0:d26c1b55cfca 888
DieterGraef 0:d26c1b55cfca 889 /* make room for Ethernet header - should not fail */
DieterGraef 0:d26c1b55cfca 890 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
DieterGraef 0:d26c1b55cfca 891 /* bail out */
DieterGraef 0:d26c1b55cfca 892 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
DieterGraef 0:d26c1b55cfca 893 ("etharp_output: could not allocate room for header.\n"));
DieterGraef 0:d26c1b55cfca 894 LINK_STATS_INC(link.lenerr);
DieterGraef 0:d26c1b55cfca 895 return ERR_BUF;
DieterGraef 0:d26c1b55cfca 896 }
DieterGraef 0:d26c1b55cfca 897
DieterGraef 0:d26c1b55cfca 898 /* Determine on destination hardware address. Broadcasts and multicasts
DieterGraef 0:d26c1b55cfca 899 * are special, other IP addresses are looked up in the ARP table. */
DieterGraef 0:d26c1b55cfca 900
DieterGraef 0:d26c1b55cfca 901 /* broadcast destination IP address? */
DieterGraef 0:d26c1b55cfca 902 if (ip_addr_isbroadcast(ipaddr, netif)) {
DieterGraef 0:d26c1b55cfca 903 /* broadcast on Ethernet also */
DieterGraef 0:d26c1b55cfca 904 dest = (struct eth_addr *)&ethbroadcast;
DieterGraef 0:d26c1b55cfca 905 /* multicast destination IP address? */
DieterGraef 0:d26c1b55cfca 906 } else if (ip_addr_ismulticast(ipaddr)) {
DieterGraef 0:d26c1b55cfca 907 /* Hash IP multicast address to MAC address.*/
DieterGraef 0:d26c1b55cfca 908 mcastaddr.addr[0] = LL_MULTICAST_ADDR_0;
DieterGraef 0:d26c1b55cfca 909 mcastaddr.addr[1] = LL_MULTICAST_ADDR_1;
DieterGraef 0:d26c1b55cfca 910 mcastaddr.addr[2] = LL_MULTICAST_ADDR_2;
DieterGraef 0:d26c1b55cfca 911 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
DieterGraef 0:d26c1b55cfca 912 mcastaddr.addr[4] = ip4_addr3(ipaddr);
DieterGraef 0:d26c1b55cfca 913 mcastaddr.addr[5] = ip4_addr4(ipaddr);
DieterGraef 0:d26c1b55cfca 914 /* destination Ethernet address is multicast */
DieterGraef 0:d26c1b55cfca 915 dest = &mcastaddr;
DieterGraef 0:d26c1b55cfca 916 /* unicast destination IP address? */
DieterGraef 0:d26c1b55cfca 917 } else {
DieterGraef 0:d26c1b55cfca 918 s8_t i;
DieterGraef 0:d26c1b55cfca 919 /* outside local network? if so, this can neither be a global broadcast nor
DieterGraef 0:d26c1b55cfca 920 a subnet broadcast. */
DieterGraef 0:d26c1b55cfca 921 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
DieterGraef 0:d26c1b55cfca 922 !ip_addr_islinklocal(ipaddr)) {
DieterGraef 0:d26c1b55cfca 923 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 924 struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
DieterGraef 0:d26c1b55cfca 925 sizeof(struct eth_hdr));
DieterGraef 0:d26c1b55cfca 926 /* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
DieterGraef 0:d26c1b55cfca 927 a link-local source address must always be "directly to its destination
DieterGraef 0:d26c1b55cfca 928 on the same physical link. The host MUST NOT send the packet to any
DieterGraef 0:d26c1b55cfca 929 router for forwarding". */
DieterGraef 0:d26c1b55cfca 930 if (!ip_addr_islinklocal(&iphdr->src))
DieterGraef 0:d26c1b55cfca 931 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 932 {
DieterGraef 0:d26c1b55cfca 933 /* interface has default gateway? */
DieterGraef 0:d26c1b55cfca 934 if (!ip_addr_isany(&netif->gw)) {
DieterGraef 0:d26c1b55cfca 935 /* send to hardware address of default gateway IP address */
DieterGraef 0:d26c1b55cfca 936 dst_addr = &(netif->gw);
DieterGraef 0:d26c1b55cfca 937 /* no default gateway available */
DieterGraef 0:d26c1b55cfca 938 } else {
DieterGraef 0:d26c1b55cfca 939 /* no route to destination error (default gateway missing) */
DieterGraef 0:d26c1b55cfca 940 return ERR_RTE;
DieterGraef 0:d26c1b55cfca 941 }
DieterGraef 0:d26c1b55cfca 942 }
DieterGraef 0:d26c1b55cfca 943 }
DieterGraef 0:d26c1b55cfca 944 #if LWIP_NETIF_HWADDRHINT
DieterGraef 0:d26c1b55cfca 945 if (netif->addr_hint != NULL) {
DieterGraef 0:d26c1b55cfca 946 /* per-pcb cached entry was given */
DieterGraef 0:d26c1b55cfca 947 u8_t etharp_cached_entry = *(netif->addr_hint);
DieterGraef 0:d26c1b55cfca 948 if (etharp_cached_entry < ARP_TABLE_SIZE) {
DieterGraef 0:d26c1b55cfca 949 #endif /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:d26c1b55cfca 950 if ((arp_table[etharp_cached_entry].state >= ETHARP_STATE_STABLE) &&
DieterGraef 0:d26c1b55cfca 951 (ip_addr_cmp(dst_addr, &arp_table[etharp_cached_entry].ipaddr))) {
DieterGraef 0:d26c1b55cfca 952 /* the per-pcb-cached entry is stable and the right one! */
DieterGraef 0:d26c1b55cfca 953 ETHARP_STATS_INC(etharp.cachehit);
DieterGraef 0:d26c1b55cfca 954 return etharp_output_to_arp_index(netif, q, etharp_cached_entry);
DieterGraef 0:d26c1b55cfca 955 }
DieterGraef 0:d26c1b55cfca 956 #if LWIP_NETIF_HWADDRHINT
DieterGraef 0:d26c1b55cfca 957 }
DieterGraef 0:d26c1b55cfca 958 }
DieterGraef 0:d26c1b55cfca 959 #endif /* LWIP_NETIF_HWADDRHINT */
DieterGraef 0:d26c1b55cfca 960
DieterGraef 0:d26c1b55cfca 961 /* find stable entry: do this here since this is a critical path for
DieterGraef 0:d26c1b55cfca 962 throughput and etharp_find_entry() is kind of slow */
DieterGraef 0:d26c1b55cfca 963 for (i = 0; i < ARP_TABLE_SIZE; i++) {
DieterGraef 0:d26c1b55cfca 964 if ((arp_table[i].state >= ETHARP_STATE_STABLE) &&
DieterGraef 0:d26c1b55cfca 965 (ip_addr_cmp(dst_addr, &arp_table[i].ipaddr))) {
DieterGraef 0:d26c1b55cfca 966 /* found an existing, stable entry */
DieterGraef 0:d26c1b55cfca 967 ETHARP_SET_HINT(netif, i);
DieterGraef 0:d26c1b55cfca 968 return etharp_output_to_arp_index(netif, q, i);
DieterGraef 0:d26c1b55cfca 969 }
DieterGraef 0:d26c1b55cfca 970 }
DieterGraef 0:d26c1b55cfca 971 /* no stable entry found, use the (slower) query function:
DieterGraef 0:d26c1b55cfca 972 queue on destination Ethernet address belonging to ipaddr */
DieterGraef 0:d26c1b55cfca 973 return etharp_query(netif, dst_addr, q);
DieterGraef 0:d26c1b55cfca 974 }
DieterGraef 0:d26c1b55cfca 975
DieterGraef 0:d26c1b55cfca 976 /* continuation for multicast/broadcast destinations */
DieterGraef 0:d26c1b55cfca 977 /* obtain source Ethernet address of the given interface */
DieterGraef 0:d26c1b55cfca 978 /* send packet directly on the link */
DieterGraef 0:d26c1b55cfca 979 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
DieterGraef 0:d26c1b55cfca 980 }
DieterGraef 0:d26c1b55cfca 981
DieterGraef 0:d26c1b55cfca 982 /**
DieterGraef 0:d26c1b55cfca 983 * Send an ARP request for the given IP address and/or queue a packet.
DieterGraef 0:d26c1b55cfca 984 *
DieterGraef 0:d26c1b55cfca 985 * If the IP address was not yet in the cache, a pending ARP cache entry
DieterGraef 0:d26c1b55cfca 986 * is added and an ARP request is sent for the given address. The packet
DieterGraef 0:d26c1b55cfca 987 * is queued on this entry.
DieterGraef 0:d26c1b55cfca 988 *
DieterGraef 0:d26c1b55cfca 989 * If the IP address was already pending in the cache, a new ARP request
DieterGraef 0:d26c1b55cfca 990 * is sent for the given address. The packet is queued on this entry.
DieterGraef 0:d26c1b55cfca 991 *
DieterGraef 0:d26c1b55cfca 992 * If the IP address was already stable in the cache, and a packet is
DieterGraef 0:d26c1b55cfca 993 * given, it is directly sent and no ARP request is sent out.
DieterGraef 0:d26c1b55cfca 994 *
DieterGraef 0:d26c1b55cfca 995 * If the IP address was already stable in the cache, and no packet is
DieterGraef 0:d26c1b55cfca 996 * given, an ARP request is sent out.
DieterGraef 0:d26c1b55cfca 997 *
DieterGraef 0:d26c1b55cfca 998 * @param netif The lwIP network interface on which ipaddr
DieterGraef 0:d26c1b55cfca 999 * must be queried for.
DieterGraef 0:d26c1b55cfca 1000 * @param ipaddr The IP address to be resolved.
DieterGraef 0:d26c1b55cfca 1001 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
DieterGraef 0:d26c1b55cfca 1002 * q is not freed by this function.
DieterGraef 0:d26c1b55cfca 1003 *
DieterGraef 0:d26c1b55cfca 1004 * @note q must only be ONE packet, not a packet queue!
DieterGraef 0:d26c1b55cfca 1005 *
DieterGraef 0:d26c1b55cfca 1006 * @return
DieterGraef 0:d26c1b55cfca 1007 * - ERR_BUF Could not make room for Ethernet header.
DieterGraef 0:d26c1b55cfca 1008 * - ERR_MEM Hardware address unknown, and no more ARP entries available
DieterGraef 0:d26c1b55cfca 1009 * to query for address or queue the packet.
DieterGraef 0:d26c1b55cfca 1010 * - ERR_MEM Could not queue packet due to memory shortage.
DieterGraef 0:d26c1b55cfca 1011 * - ERR_RTE No route to destination (no gateway to external networks).
DieterGraef 0:d26c1b55cfca 1012 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
DieterGraef 0:d26c1b55cfca 1013 *
DieterGraef 0:d26c1b55cfca 1014 */
DieterGraef 0:d26c1b55cfca 1015 err_t
DieterGraef 0:d26c1b55cfca 1016 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
DieterGraef 0:d26c1b55cfca 1017 {
DieterGraef 0:d26c1b55cfca 1018 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
DieterGraef 0:d26c1b55cfca 1019 err_t result = ERR_MEM;
DieterGraef 0:d26c1b55cfca 1020 s8_t i; /* ARP entry index */
DieterGraef 0:d26c1b55cfca 1021
DieterGraef 0:d26c1b55cfca 1022 /* non-unicast address? */
DieterGraef 0:d26c1b55cfca 1023 if (ip_addr_isbroadcast(ipaddr, netif) ||
DieterGraef 0:d26c1b55cfca 1024 ip_addr_ismulticast(ipaddr) ||
DieterGraef 0:d26c1b55cfca 1025 ip_addr_isany(ipaddr)) {
DieterGraef 0:d26c1b55cfca 1026 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
DieterGraef 0:d26c1b55cfca 1027 return ERR_ARG;
DieterGraef 0:d26c1b55cfca 1028 }
DieterGraef 0:d26c1b55cfca 1029
DieterGraef 0:d26c1b55cfca 1030 /* find entry in ARP cache, ask to create entry if queueing packet */
DieterGraef 0:d26c1b55cfca 1031 i = etharp_find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
DieterGraef 0:d26c1b55cfca 1032
DieterGraef 0:d26c1b55cfca 1033 /* could not find or create entry? */
DieterGraef 0:d26c1b55cfca 1034 if (i < 0) {
DieterGraef 0:d26c1b55cfca 1035 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
DieterGraef 0:d26c1b55cfca 1036 if (q) {
DieterGraef 0:d26c1b55cfca 1037 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
DieterGraef 0:d26c1b55cfca 1038 ETHARP_STATS_INC(etharp.memerr);
DieterGraef 0:d26c1b55cfca 1039 }
DieterGraef 0:d26c1b55cfca 1040 return (err_t)i;
DieterGraef 0:d26c1b55cfca 1041 }
DieterGraef 0:d26c1b55cfca 1042
DieterGraef 0:d26c1b55cfca 1043 /* mark a fresh entry as pending (we just sent a request) */
DieterGraef 0:d26c1b55cfca 1044 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
DieterGraef 0:d26c1b55cfca 1045 arp_table[i].state = ETHARP_STATE_PENDING;
DieterGraef 0:d26c1b55cfca 1046 }
DieterGraef 0:d26c1b55cfca 1047
DieterGraef 0:d26c1b55cfca 1048 /* { i is either a STABLE or (new or existing) PENDING entry } */
DieterGraef 0:d26c1b55cfca 1049 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
DieterGraef 0:d26c1b55cfca 1050 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
DieterGraef 0:d26c1b55cfca 1051 (arp_table[i].state >= ETHARP_STATE_STABLE)));
DieterGraef 0:d26c1b55cfca 1052
DieterGraef 0:d26c1b55cfca 1053 /* do we have a pending entry? or an implicit query request? */
DieterGraef 0:d26c1b55cfca 1054 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
DieterGraef 0:d26c1b55cfca 1055 /* try to resolve it; send out ARP request */
DieterGraef 0:d26c1b55cfca 1056 result = etharp_request(netif, ipaddr);
DieterGraef 0:d26c1b55cfca 1057 if (result != ERR_OK) {
DieterGraef 0:d26c1b55cfca 1058 /* ARP request couldn't be sent */
DieterGraef 0:d26c1b55cfca 1059 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
DieterGraef 0:d26c1b55cfca 1060 since this failure could be temporary, and the next packet calling
DieterGraef 0:d26c1b55cfca 1061 etharp_query again could lead to sending the queued packets. */
DieterGraef 0:d26c1b55cfca 1062 }
DieterGraef 0:d26c1b55cfca 1063 if (q == NULL) {
DieterGraef 0:d26c1b55cfca 1064 return result;
DieterGraef 0:d26c1b55cfca 1065 }
DieterGraef 0:d26c1b55cfca 1066 }
DieterGraef 0:d26c1b55cfca 1067
DieterGraef 0:d26c1b55cfca 1068 /* packet given? */
DieterGraef 0:d26c1b55cfca 1069 LWIP_ASSERT("q != NULL", q != NULL);
DieterGraef 0:d26c1b55cfca 1070 /* stable entry? */
DieterGraef 0:d26c1b55cfca 1071 if (arp_table[i].state >= ETHARP_STATE_STABLE) {
DieterGraef 0:d26c1b55cfca 1072 /* we have a valid IP->Ethernet address mapping */
DieterGraef 0:d26c1b55cfca 1073 ETHARP_SET_HINT(netif, i);
DieterGraef 0:d26c1b55cfca 1074 /* send the packet */
DieterGraef 0:d26c1b55cfca 1075 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
DieterGraef 0:d26c1b55cfca 1076 /* pending entry? (either just created or already pending */
DieterGraef 0:d26c1b55cfca 1077 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
DieterGraef 0:d26c1b55cfca 1078 /* entry is still pending, queue the given packet 'q' */
DieterGraef 0:d26c1b55cfca 1079 struct pbuf *p;
DieterGraef 0:d26c1b55cfca 1080 int copy_needed = 0;
DieterGraef 0:d26c1b55cfca 1081 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
DieterGraef 0:d26c1b55cfca 1082 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
DieterGraef 0:d26c1b55cfca 1083 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
DieterGraef 0:d26c1b55cfca 1084 p = q;
DieterGraef 0:d26c1b55cfca 1085 while (p) {
DieterGraef 0:d26c1b55cfca 1086 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
DieterGraef 0:d26c1b55cfca 1087 if(p->type != PBUF_ROM) {
DieterGraef 0:d26c1b55cfca 1088 copy_needed = 1;
DieterGraef 0:d26c1b55cfca 1089 break;
DieterGraef 0:d26c1b55cfca 1090 }
DieterGraef 0:d26c1b55cfca 1091 p = p->next;
DieterGraef 0:d26c1b55cfca 1092 }
DieterGraef 0:d26c1b55cfca 1093 if(copy_needed) {
DieterGraef 0:d26c1b55cfca 1094 /* copy the whole packet into new pbufs */
DieterGraef 0:d26c1b55cfca 1095 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
DieterGraef 0:d26c1b55cfca 1096 if(p != NULL) {
DieterGraef 0:d26c1b55cfca 1097 if (pbuf_copy(p, q) != ERR_OK) {
DieterGraef 0:d26c1b55cfca 1098 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 1099 p = NULL;
DieterGraef 0:d26c1b55cfca 1100 }
DieterGraef 0:d26c1b55cfca 1101 }
DieterGraef 0:d26c1b55cfca 1102 } else {
DieterGraef 0:d26c1b55cfca 1103 /* referencing the old pbuf is enough */
DieterGraef 0:d26c1b55cfca 1104 p = q;
DieterGraef 0:d26c1b55cfca 1105 pbuf_ref(p);
DieterGraef 0:d26c1b55cfca 1106 }
DieterGraef 0:d26c1b55cfca 1107 /* packet could be taken over? */
DieterGraef 0:d26c1b55cfca 1108 if (p != NULL) {
DieterGraef 0:d26c1b55cfca 1109 /* queue packet ... */
DieterGraef 0:d26c1b55cfca 1110 #if ARP_QUEUEING
DieterGraef 0:d26c1b55cfca 1111 struct etharp_q_entry *new_entry;
DieterGraef 0:d26c1b55cfca 1112 /* allocate a new arp queue entry */
DieterGraef 0:d26c1b55cfca 1113 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
DieterGraef 0:d26c1b55cfca 1114 if (new_entry != NULL) {
DieterGraef 0:d26c1b55cfca 1115 new_entry->next = 0;
DieterGraef 0:d26c1b55cfca 1116 new_entry->p = p;
DieterGraef 0:d26c1b55cfca 1117 if(arp_table[i].q != NULL) {
DieterGraef 0:d26c1b55cfca 1118 /* queue was already existent, append the new entry to the end */
DieterGraef 0:d26c1b55cfca 1119 struct etharp_q_entry *r;
DieterGraef 0:d26c1b55cfca 1120 r = arp_table[i].q;
DieterGraef 0:d26c1b55cfca 1121 while (r->next != NULL) {
DieterGraef 0:d26c1b55cfca 1122 r = r->next;
DieterGraef 0:d26c1b55cfca 1123 }
DieterGraef 0:d26c1b55cfca 1124 r->next = new_entry;
DieterGraef 0:d26c1b55cfca 1125 } else {
DieterGraef 0:d26c1b55cfca 1126 /* queue did not exist, first item in queue */
DieterGraef 0:d26c1b55cfca 1127 arp_table[i].q = new_entry;
DieterGraef 0:d26c1b55cfca 1128 }
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 1130 result = ERR_OK;
DieterGraef 0:d26c1b55cfca 1131 } else {
DieterGraef 0:d26c1b55cfca 1132 /* the pool MEMP_ARP_QUEUE is empty */
DieterGraef 0:d26c1b55cfca 1133 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 1135 result = ERR_MEM;
DieterGraef 0:d26c1b55cfca 1136 }
DieterGraef 0:d26c1b55cfca 1137 #else /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 1138 /* always queue one packet per ARP request only, freeing a previously queued packet */
DieterGraef 0:d26c1b55cfca 1139 if (arp_table[i].q != NULL) {
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 1141 pbuf_free(arp_table[i].q);
DieterGraef 0:d26c1b55cfca 1142 }
DieterGraef 0:d26c1b55cfca 1143 arp_table[i].q = p;
DieterGraef 0:d26c1b55cfca 1144 result = ERR_OK;
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 1146 #endif /* ARP_QUEUEING */
DieterGraef 0:d26c1b55cfca 1147 } else {
DieterGraef 0:d26c1b55cfca 1148 ETHARP_STATS_INC(etharp.memerr);
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 1150 result = ERR_MEM;
DieterGraef 0:d26c1b55cfca 1151 }
DieterGraef 0:d26c1b55cfca 1152 }
DieterGraef 0:d26c1b55cfca 1153 return result;
DieterGraef 0:d26c1b55cfca 1154 }
DieterGraef 0:d26c1b55cfca 1155
DieterGraef 0:d26c1b55cfca 1156 /**
DieterGraef 0:d26c1b55cfca 1157 * Send a raw ARP packet (opcode and all addresses can be modified)
DieterGraef 0:d26c1b55cfca 1158 *
DieterGraef 0:d26c1b55cfca 1159 * @param netif the lwip network interface on which to send the ARP packet
DieterGraef 0:d26c1b55cfca 1160 * @param ethsrc_addr the source MAC address for the ethernet header
DieterGraef 0:d26c1b55cfca 1161 * @param ethdst_addr the destination MAC address for the ethernet header
DieterGraef 0:d26c1b55cfca 1162 * @param hwsrc_addr the source MAC address for the ARP protocol header
DieterGraef 0:d26c1b55cfca 1163 * @param ipsrc_addr the source IP address for the ARP protocol header
DieterGraef 0:d26c1b55cfca 1164 * @param hwdst_addr the destination MAC address for the ARP protocol header
DieterGraef 0:d26c1b55cfca 1165 * @param ipdst_addr the destination IP address for the ARP protocol header
DieterGraef 0:d26c1b55cfca 1166 * @param opcode the type of the ARP packet
DieterGraef 0:d26c1b55cfca 1167 * @return ERR_OK if the ARP packet has been sent
DieterGraef 0:d26c1b55cfca 1168 * ERR_MEM if the ARP packet couldn't be allocated
DieterGraef 0:d26c1b55cfca 1169 * any other err_t on failure
DieterGraef 0:d26c1b55cfca 1170 */
DieterGraef 0:d26c1b55cfca 1171 #if !LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 1172 static
DieterGraef 0:d26c1b55cfca 1173 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 1174 err_t
DieterGraef 0:d26c1b55cfca 1175 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
DieterGraef 0:d26c1b55cfca 1176 const struct eth_addr *ethdst_addr,
DieterGraef 0:d26c1b55cfca 1177 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
DieterGraef 0:d26c1b55cfca 1178 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
DieterGraef 0:d26c1b55cfca 1179 const u16_t opcode)
DieterGraef 0:d26c1b55cfca 1180 {
DieterGraef 0:d26c1b55cfca 1181 struct pbuf *p;
DieterGraef 0:d26c1b55cfca 1182 err_t result = ERR_OK;
DieterGraef 0:d26c1b55cfca 1183 struct eth_hdr *ethhdr;
DieterGraef 0:d26c1b55cfca 1184 struct etharp_hdr *hdr;
DieterGraef 0:d26c1b55cfca 1185 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 1186 const u8_t * ethdst_hwaddr;
DieterGraef 0:d26c1b55cfca 1187 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 1188
DieterGraef 0:d26c1b55cfca 1189 LWIP_ASSERT("netif != NULL", netif != NULL);
DieterGraef 0:d26c1b55cfca 1190
DieterGraef 0:d26c1b55cfca 1191 /* allocate a pbuf for the outgoing ARP request packet */
DieterGraef 0:d26c1b55cfca 1192 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
DieterGraef 0:d26c1b55cfca 1193 /* could allocate a pbuf for an ARP request? */
DieterGraef 0:d26c1b55cfca 1194 if (p == NULL) {
DieterGraef 0:d26c1b55cfca 1195 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
DieterGraef 0:d26c1b55cfca 1196 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
DieterGraef 0:d26c1b55cfca 1197 ETHARP_STATS_INC(etharp.memerr);
DieterGraef 0:d26c1b55cfca 1198 return ERR_MEM;
DieterGraef 0:d26c1b55cfca 1199 }
DieterGraef 0:d26c1b55cfca 1200 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
DieterGraef 0:d26c1b55cfca 1201 (p->len >= SIZEOF_ETHARP_PACKET));
DieterGraef 0:d26c1b55cfca 1202
DieterGraef 0:d26c1b55cfca 1203 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:d26c1b55cfca 1204 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
DieterGraef 0:d26c1b55cfca 1205 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
DieterGraef 0:d26c1b55cfca 1206 hdr->opcode = htons(opcode);
DieterGraef 0:d26c1b55cfca 1207
DieterGraef 0:d26c1b55cfca 1208 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
DieterGraef 0:d26c1b55cfca 1209 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
DieterGraef 0:d26c1b55cfca 1210 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 1211 /* If we are using Link-Local, all ARP packets that contain a Link-Local
DieterGraef 0:d26c1b55cfca 1212 * 'sender IP address' MUST be sent using link-layer broadcast instead of
DieterGraef 0:d26c1b55cfca 1213 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
DieterGraef 0:d26c1b55cfca 1214 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
DieterGraef 0:d26c1b55cfca 1215 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 1216 /* Write the ARP MAC-Addresses */
DieterGraef 0:d26c1b55cfca 1217 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
DieterGraef 0:d26c1b55cfca 1218 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
DieterGraef 0:d26c1b55cfca 1219 /* Write the Ethernet MAC-Addresses */
DieterGraef 0:d26c1b55cfca 1220 #if LWIP_AUTOIP
DieterGraef 0:d26c1b55cfca 1221 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
DieterGraef 0:d26c1b55cfca 1222 #else /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 1223 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
DieterGraef 0:d26c1b55cfca 1224 #endif /* LWIP_AUTOIP */
DieterGraef 0:d26c1b55cfca 1225 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
DieterGraef 0:d26c1b55cfca 1226 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
DieterGraef 0:d26c1b55cfca 1227 * structure packing. */
DieterGraef 0:d26c1b55cfca 1228 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
DieterGraef 0:d26c1b55cfca 1229 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
DieterGraef 0:d26c1b55cfca 1230
DieterGraef 0:d26c1b55cfca 1231 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
DieterGraef 0:d26c1b55cfca 1232 hdr->proto = PP_HTONS(ETHTYPE_IP);
DieterGraef 0:d26c1b55cfca 1233 /* set hwlen and protolen */
DieterGraef 0:d26c1b55cfca 1234 hdr->hwlen = ETHARP_HWADDR_LEN;
DieterGraef 0:d26c1b55cfca 1235 hdr->protolen = sizeof(ip_addr_t);
DieterGraef 0:d26c1b55cfca 1236
DieterGraef 0:d26c1b55cfca 1237 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
DieterGraef 0:d26c1b55cfca 1238 /* send ARP query */
DieterGraef 0:d26c1b55cfca 1239 result = netif->linkoutput(netif, p);
DieterGraef 0:d26c1b55cfca 1240 ETHARP_STATS_INC(etharp.xmit);
DieterGraef 0:d26c1b55cfca 1241 /* free ARP query packet */
DieterGraef 0:d26c1b55cfca 1242 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 1243 p = NULL;
DieterGraef 0:d26c1b55cfca 1244 /* could not allocate pbuf for ARP request */
DieterGraef 0:d26c1b55cfca 1245
DieterGraef 0:d26c1b55cfca 1246 return result;
DieterGraef 0:d26c1b55cfca 1247 }
DieterGraef 0:d26c1b55cfca 1248
DieterGraef 0:d26c1b55cfca 1249 /**
DieterGraef 0:d26c1b55cfca 1250 * Send an ARP request packet asking for ipaddr.
DieterGraef 0:d26c1b55cfca 1251 *
DieterGraef 0:d26c1b55cfca 1252 * @param netif the lwip network interface on which to send the request
DieterGraef 0:d26c1b55cfca 1253 * @param ipaddr the IP address for which to ask
DieterGraef 0:d26c1b55cfca 1254 * @return ERR_OK if the request has been sent
DieterGraef 0:d26c1b55cfca 1255 * ERR_MEM if the ARP packet couldn't be allocated
DieterGraef 0:d26c1b55cfca 1256 * any other err_t on failure
DieterGraef 0:d26c1b55cfca 1257 */
DieterGraef 0:d26c1b55cfca 1258 err_t
DieterGraef 0:d26c1b55cfca 1259 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
DieterGraef 0:d26c1b55cfca 1260 {
DieterGraef 0:d26c1b55cfca 1261 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
DieterGraef 0:d26c1b55cfca 1262 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
DieterGraef 0:d26c1b55cfca 1263 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
DieterGraef 0:d26c1b55cfca 1264 ipaddr, ARP_REQUEST);
DieterGraef 0:d26c1b55cfca 1265 }
DieterGraef 0:d26c1b55cfca 1266 #endif /* LWIP_ARP */
DieterGraef 0:d26c1b55cfca 1267
DieterGraef 0:d26c1b55cfca 1268 /**
DieterGraef 0:d26c1b55cfca 1269 * Process received ethernet frames. Using this function instead of directly
DieterGraef 0:d26c1b55cfca 1270 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
DieterGraef 0:d26c1b55cfca 1271 * the ARP cache is protected from concurrent access.
DieterGraef 0:d26c1b55cfca 1272 *
DieterGraef 0:d26c1b55cfca 1273 * @param p the recevied packet, p->payload pointing to the ethernet header
DieterGraef 0:d26c1b55cfca 1274 * @param netif the network interface on which the packet was received
DieterGraef 0:d26c1b55cfca 1275 */
DieterGraef 0:d26c1b55cfca 1276 err_t
DieterGraef 0:d26c1b55cfca 1277 ethernet_input(struct pbuf *p, struct netif *netif)
DieterGraef 0:d26c1b55cfca 1278 {
DieterGraef 0:d26c1b55cfca 1279 struct eth_hdr* ethhdr;
DieterGraef 0:d26c1b55cfca 1280 u16_t type;
DieterGraef 0:d26c1b55cfca 1281 #if LWIP_ARP || ETHARP_SUPPORT_VLAN
DieterGraef 0:d26c1b55cfca 1282 s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
DieterGraef 0:d26c1b55cfca 1283 #endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */
DieterGraef 0:d26c1b55cfca 1284
DieterGraef 0:d26c1b55cfca 1285 if (p->len <= SIZEOF_ETH_HDR) {
DieterGraef 0:d26c1b55cfca 1286 /* a packet with only an ethernet header (or less) is not valid for us */
DieterGraef 0:d26c1b55cfca 1287 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:d26c1b55cfca 1288 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:d26c1b55cfca 1289 goto free_and_return;
DieterGraef 0:d26c1b55cfca 1290 }
DieterGraef 0:d26c1b55cfca 1291
DieterGraef 0:d26c1b55cfca 1292 /* points to packet payload, which starts with an Ethernet header */
DieterGraef 0:d26c1b55cfca 1293 ethhdr = (struct eth_hdr *)p->payload;
DieterGraef 0:d26c1b55cfca 1294 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
DieterGraef 0:d26c1b55cfca 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:d26c1b55cfca 1296 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
DieterGraef 0:d26c1b55cfca 1297 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
DieterGraef 0:d26c1b55cfca 1298 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
DieterGraef 0:d26c1b55cfca 1299 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
DieterGraef 0:d26c1b55cfca 1300 (unsigned)htons(ethhdr->type)));
DieterGraef 0:d26c1b55cfca 1301
DieterGraef 0:d26c1b55cfca 1302 type = ethhdr->type;
DieterGraef 0:d26c1b55cfca 1303 #if ETHARP_SUPPORT_VLAN
DieterGraef 0:d26c1b55cfca 1304 if (type == PP_HTONS(ETHTYPE_VLAN)) {
DieterGraef 0:d26c1b55cfca 1305 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
DieterGraef 0:d26c1b55cfca 1306 if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
DieterGraef 0:d26c1b55cfca 1307 /* a packet with only an ethernet/vlan header (or less) is not valid for us */
DieterGraef 0:d26c1b55cfca 1308 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:d26c1b55cfca 1309 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:d26c1b55cfca 1310 goto free_and_return;
DieterGraef 0:d26c1b55cfca 1311 }
DieterGraef 0:d26c1b55cfca 1312 #if defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
DieterGraef 0:d26c1b55cfca 1313 #ifdef ETHARP_VLAN_CHECK_FN
DieterGraef 0:d26c1b55cfca 1314 if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
DieterGraef 0:d26c1b55cfca 1315 #elif defined(ETHARP_VLAN_CHECK)
DieterGraef 0:d26c1b55cfca 1316 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
DieterGraef 0:d26c1b55cfca 1317 #endif
DieterGraef 0:d26c1b55cfca 1318 /* silently ignore this packet: not for our VLAN */
DieterGraef 0:d26c1b55cfca 1319 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 1320 return ERR_OK;
DieterGraef 0:d26c1b55cfca 1321 }
DieterGraef 0:d26c1b55cfca 1322 #endif /* defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
DieterGraef 0:d26c1b55cfca 1323 type = vlan->tpid;
DieterGraef 0:d26c1b55cfca 1324 ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
DieterGraef 0:d26c1b55cfca 1325 }
DieterGraef 0:d26c1b55cfca 1326 #endif /* ETHARP_SUPPORT_VLAN */
DieterGraef 0:d26c1b55cfca 1327
DieterGraef 0:d26c1b55cfca 1328 #if LWIP_ARP_FILTER_NETIF
DieterGraef 0:d26c1b55cfca 1329 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
DieterGraef 0:d26c1b55cfca 1330 #endif /* LWIP_ARP_FILTER_NETIF*/
DieterGraef 0:d26c1b55cfca 1331
DieterGraef 0:d26c1b55cfca 1332 if (ethhdr->dest.addr[0] & 1) {
DieterGraef 0:d26c1b55cfca 1333 /* this might be a multicast or broadcast packet */
DieterGraef 0:d26c1b55cfca 1334 if (ethhdr->dest.addr[0] == LL_MULTICAST_ADDR_0) {
DieterGraef 0:d26c1b55cfca 1335 if ((ethhdr->dest.addr[1] == LL_MULTICAST_ADDR_1) &&
DieterGraef 0:d26c1b55cfca 1336 (ethhdr->dest.addr[2] == LL_MULTICAST_ADDR_2)) {
DieterGraef 0:d26c1b55cfca 1337 /* mark the pbuf as link-layer multicast */
DieterGraef 0:d26c1b55cfca 1338 p->flags |= PBUF_FLAG_LLMCAST;
DieterGraef 0:d26c1b55cfca 1339 }
DieterGraef 0:d26c1b55cfca 1340 } else if (eth_addr_cmp(&ethhdr->dest, &ethbroadcast)) {
DieterGraef 0:d26c1b55cfca 1341 /* mark the pbuf as link-layer broadcast */
DieterGraef 0:d26c1b55cfca 1342 p->flags |= PBUF_FLAG_LLBCAST;
DieterGraef 0:d26c1b55cfca 1343 }
DieterGraef 0:d26c1b55cfca 1344 }
DieterGraef 0:d26c1b55cfca 1345
DieterGraef 0:d26c1b55cfca 1346 switch (type) {
DieterGraef 0:d26c1b55cfca 1347 #if LWIP_ARP
DieterGraef 0:d26c1b55cfca 1348 /* IP packet? */
DieterGraef 0:d26c1b55cfca 1349 case PP_HTONS(ETHTYPE_IP):
DieterGraef 0:d26c1b55cfca 1350 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
DieterGraef 0:d26c1b55cfca 1351 goto free_and_return;
DieterGraef 0:d26c1b55cfca 1352 }
DieterGraef 0:d26c1b55cfca 1353 #if ETHARP_TRUST_IP_MAC
DieterGraef 0:d26c1b55cfca 1354 /* update ARP table */
DieterGraef 0:d26c1b55cfca 1355 etharp_ip_input(netif, p);
DieterGraef 0:d26c1b55cfca 1356 #endif /* ETHARP_TRUST_IP_MAC */
DieterGraef 0:d26c1b55cfca 1357 /* skip Ethernet header */
DieterGraef 0:d26c1b55cfca 1358 if(pbuf_header(p, -ip_hdr_offset)) {
DieterGraef 0:d26c1b55cfca 1359 LWIP_ASSERT("Can't move over header in packet", 0);
DieterGraef 0:d26c1b55cfca 1360 goto free_and_return;
DieterGraef 0:d26c1b55cfca 1361 } else {
DieterGraef 0:d26c1b55cfca 1362 /* pass to IP layer */
DieterGraef 0:d26c1b55cfca 1363 ip_input(p, netif);
DieterGraef 0:d26c1b55cfca 1364 }
DieterGraef 0:d26c1b55cfca 1365 break;
DieterGraef 0:d26c1b55cfca 1366
DieterGraef 0:d26c1b55cfca 1367 case PP_HTONS(ETHTYPE_ARP):
DieterGraef 0:d26c1b55cfca 1368 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
DieterGraef 0:d26c1b55cfca 1369 goto free_and_return;
DieterGraef 0:d26c1b55cfca 1370 }
DieterGraef 0:d26c1b55cfca 1371 /* pass p to ARP module */
DieterGraef 0:d26c1b55cfca 1372 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
DieterGraef 0:d26c1b55cfca 1373 break;
DieterGraef 0:d26c1b55cfca 1374 #endif /* LWIP_ARP */
DieterGraef 0:d26c1b55cfca 1375 #if PPPOE_SUPPORT
DieterGraef 0:d26c1b55cfca 1376 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
DieterGraef 0:d26c1b55cfca 1377 pppoe_disc_input(netif, p);
DieterGraef 0:d26c1b55cfca 1378 break;
DieterGraef 0:d26c1b55cfca 1379
DieterGraef 0:d26c1b55cfca 1380 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
DieterGraef 0:d26c1b55cfca 1381 pppoe_data_input(netif, p);
DieterGraef 0:d26c1b55cfca 1382 break;
DieterGraef 0:d26c1b55cfca 1383 #endif /* PPPOE_SUPPORT */
DieterGraef 0:d26c1b55cfca 1384
DieterGraef 0:d26c1b55cfca 1385 default:
DieterGraef 0:d26c1b55cfca 1386 ETHARP_STATS_INC(etharp.proterr);
DieterGraef 0:d26c1b55cfca 1387 ETHARP_STATS_INC(etharp.drop);
DieterGraef 0:d26c1b55cfca 1388 goto free_and_return;
DieterGraef 0:d26c1b55cfca 1389 }
DieterGraef 0:d26c1b55cfca 1390
DieterGraef 0:d26c1b55cfca 1391 /* This means the pbuf is freed or consumed,
DieterGraef 0:d26c1b55cfca 1392 so the caller doesn't have to free it again */
DieterGraef 0:d26c1b55cfca 1393 return ERR_OK;
DieterGraef 0:d26c1b55cfca 1394
DieterGraef 0:d26c1b55cfca 1395 free_and_return:
DieterGraef 0:d26c1b55cfca 1396 pbuf_free(p);
DieterGraef 0:d26c1b55cfca 1397 return ERR_OK;
DieterGraef 0:d26c1b55cfca 1398 }
DieterGraef 0:d26c1b55cfca 1399 #endif /* LWIP_ARP || LWIP_ETHERNET */