CK Sin / Mbed 2 deprecated Ethernetwebsocket

Ethernetwebsoc

Dependencies:   C12832_lcd LM75B WebSocketClient mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/netif/etharp.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * Address Resolution Protocol module for IP over Ethernet
GordonSin 0:0ed2a7c7190c 4 *
GordonSin 0:0ed2a7c7190c 5 * Functionally, ARP is divided into two parts. The first maps an IP address
GordonSin 0:0ed2a7c7190c 6 * to a physical address when sending a packet, and the second part answers
GordonSin 0:0ed2a7c7190c 7 * requests from other machines for our physical address.
GordonSin 0:0ed2a7c7190c 8 *
GordonSin 0:0ed2a7c7190c 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
GordonSin 0:0ed2a7c7190c 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
GordonSin 0:0ed2a7c7190c 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
GordonSin 0:0ed2a7c7190c 12 */
GordonSin 0:0ed2a7c7190c 13
GordonSin 0:0ed2a7c7190c 14 /*
GordonSin 0:0ed2a7c7190c 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
GordonSin 0:0ed2a7c7190c 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
GordonSin 0:0ed2a7c7190c 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
GordonSin 0:0ed2a7c7190c 18 * All rights reserved.
GordonSin 0:0ed2a7c7190c 19 *
GordonSin 0:0ed2a7c7190c 20 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 21 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 22 *
GordonSin 0:0ed2a7c7190c 23 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 24 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 26 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 27 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 28 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 29 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 30 *
GordonSin 0:0ed2a7c7190c 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 40 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 41 *
GordonSin 0:0ed2a7c7190c 42 * This file is part of the lwIP TCP/IP stack.
GordonSin 0:0ed2a7c7190c 43 *
GordonSin 0:0ed2a7c7190c 44 */
GordonSin 0:0ed2a7c7190c 45
GordonSin 0:0ed2a7c7190c 46 #include "lwip/opt.h"
GordonSin 0:0ed2a7c7190c 47
GordonSin 0:0ed2a7c7190c 48 #if LWIP_ARP || LWIP_ETHERNET
GordonSin 0:0ed2a7c7190c 49
GordonSin 0:0ed2a7c7190c 50 #include "lwip/ip_addr.h"
GordonSin 0:0ed2a7c7190c 51 #include "lwip/def.h"
GordonSin 0:0ed2a7c7190c 52 #include "lwip/ip.h"
GordonSin 0:0ed2a7c7190c 53 #include "lwip/stats.h"
GordonSin 0:0ed2a7c7190c 54 #include "lwip/snmp.h"
GordonSin 0:0ed2a7c7190c 55 #include "lwip/dhcp.h"
GordonSin 0:0ed2a7c7190c 56 #include "lwip/autoip.h"
GordonSin 0:0ed2a7c7190c 57 #include "netif/etharp.h"
GordonSin 0:0ed2a7c7190c 58
GordonSin 0:0ed2a7c7190c 59 #if PPPOE_SUPPORT
GordonSin 0:0ed2a7c7190c 60 #include "netif/ppp_oe.h"
GordonSin 0:0ed2a7c7190c 61 #endif /* PPPOE_SUPPORT */
GordonSin 0:0ed2a7c7190c 62
GordonSin 0:0ed2a7c7190c 63 #include <string.h>
GordonSin 0:0ed2a7c7190c 64
GordonSin 0:0ed2a7c7190c 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
GordonSin 0:0ed2a7c7190c 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
GordonSin 0:0ed2a7c7190c 67
GordonSin 0:0ed2a7c7190c 68 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
GordonSin 0:0ed2a7c7190c 69
GordonSin 0:0ed2a7c7190c 70 /** the time an ARP entry stays valid after its last update,
GordonSin 0:0ed2a7c7190c 71 * for ARP_TMR_INTERVAL = 5000, this is
GordonSin 0:0ed2a7c7190c 72 * (240 * 5) seconds = 20 minutes.
GordonSin 0:0ed2a7c7190c 73 */
GordonSin 0:0ed2a7c7190c 74 #define ARP_MAXAGE 240
GordonSin 0:0ed2a7c7190c 75 /** the time an ARP entry stays pending after first request,
GordonSin 0:0ed2a7c7190c 76 * for ARP_TMR_INTERVAL = 5000, this is
GordonSin 0:0ed2a7c7190c 77 * (2 * 5) seconds = 10 seconds.
GordonSin 0:0ed2a7c7190c 78 *
GordonSin 0:0ed2a7c7190c 79 * @internal Keep this number at least 2, otherwise it might
GordonSin 0:0ed2a7c7190c 80 * run out instantly if the timeout occurs directly after a request.
GordonSin 0:0ed2a7c7190c 81 */
GordonSin 0:0ed2a7c7190c 82 #define ARP_MAXPENDING 2
GordonSin 0:0ed2a7c7190c 83
GordonSin 0:0ed2a7c7190c 84 #define HWTYPE_ETHERNET 1
GordonSin 0:0ed2a7c7190c 85
GordonSin 0:0ed2a7c7190c 86 enum etharp_state {
GordonSin 0:0ed2a7c7190c 87 ETHARP_STATE_EMPTY = 0,
GordonSin 0:0ed2a7c7190c 88 ETHARP_STATE_PENDING,
GordonSin 0:0ed2a7c7190c 89 ETHARP_STATE_STABLE
GordonSin 0:0ed2a7c7190c 90 };
GordonSin 0:0ed2a7c7190c 91
GordonSin 0:0ed2a7c7190c 92 struct etharp_entry {
GordonSin 0:0ed2a7c7190c 93 #if ARP_QUEUEING
GordonSin 0:0ed2a7c7190c 94 /** Pointer to queue of pending outgoing packets on this ARP entry. */
GordonSin 0:0ed2a7c7190c 95 struct etharp_q_entry *q;
GordonSin 0:0ed2a7c7190c 96 #else /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 97 /** Pointer to a single pending outgoing packet on this ARP entry. */
GordonSin 0:0ed2a7c7190c 98 struct pbuf *q;
GordonSin 0:0ed2a7c7190c 99 #endif /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 100 ip_addr_t ipaddr;
GordonSin 0:0ed2a7c7190c 101 struct eth_addr ethaddr;
GordonSin 0:0ed2a7c7190c 102 #if LWIP_SNMP
GordonSin 0:0ed2a7c7190c 103 struct netif *netif;
GordonSin 0:0ed2a7c7190c 104 #endif /* LWIP_SNMP */
GordonSin 0:0ed2a7c7190c 105 u8_t state;
GordonSin 0:0ed2a7c7190c 106 u8_t ctime;
GordonSin 0:0ed2a7c7190c 107 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 108 u8_t static_entry;
GordonSin 0:0ed2a7c7190c 109 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 110 };
GordonSin 0:0ed2a7c7190c 111
GordonSin 0:0ed2a7c7190c 112 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
GordonSin 0:0ed2a7c7190c 113
GordonSin 0:0ed2a7c7190c 114 #if !LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 115 static u8_t etharp_cached_entry;
GordonSin 0:0ed2a7c7190c 116 #endif /* !LWIP_NETIF_HWADDRHINT */
GordonSin 0:0ed2a7c7190c 117
GordonSin 0:0ed2a7c7190c 118 /** Try hard to create a new entry - we want the IP address to appear in
GordonSin 0:0ed2a7c7190c 119 the cache (even if this means removing an active entry or so). */
GordonSin 0:0ed2a7c7190c 120 #define ETHARP_FLAG_TRY_HARD 1
GordonSin 0:0ed2a7c7190c 121 #define ETHARP_FLAG_FIND_ONLY 2
GordonSin 0:0ed2a7c7190c 122 #define ETHARP_FLAG_STATIC_ENTRY 4
GordonSin 0:0ed2a7c7190c 123
GordonSin 0:0ed2a7c7190c 124 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 125 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
GordonSin 0:0ed2a7c7190c 126 *((netif)->addr_hint) = (hint);
GordonSin 0:0ed2a7c7190c 127 #else /* LWIP_NETIF_HWADDRHINT */
GordonSin 0:0ed2a7c7190c 128 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
GordonSin 0:0ed2a7c7190c 129 #endif /* LWIP_NETIF_HWADDRHINT */
GordonSin 0:0ed2a7c7190c 130
GordonSin 0:0ed2a7c7190c 131 static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags);
GordonSin 0:0ed2a7c7190c 132
GordonSin 0:0ed2a7c7190c 133
GordonSin 0:0ed2a7c7190c 134 /* Some checks, instead of etharp_init(): */
GordonSin 0:0ed2a7c7190c 135 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
GordonSin 0:0ed2a7c7190c 136 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
GordonSin 0:0ed2a7c7190c 137 #endif
GordonSin 0:0ed2a7c7190c 138
GordonSin 0:0ed2a7c7190c 139
GordonSin 0:0ed2a7c7190c 140 #if ARP_QUEUEING
GordonSin 0:0ed2a7c7190c 141 /**
GordonSin 0:0ed2a7c7190c 142 * Free a complete queue of etharp entries
GordonSin 0:0ed2a7c7190c 143 *
GordonSin 0:0ed2a7c7190c 144 * @param q a qeueue of etharp_q_entry's to free
GordonSin 0:0ed2a7c7190c 145 */
GordonSin 0:0ed2a7c7190c 146 static void
GordonSin 0:0ed2a7c7190c 147 free_etharp_q(struct etharp_q_entry *q)
GordonSin 0:0ed2a7c7190c 148 {
GordonSin 0:0ed2a7c7190c 149 struct etharp_q_entry *r;
GordonSin 0:0ed2a7c7190c 150 LWIP_ASSERT("q != NULL", q != NULL);
GordonSin 0:0ed2a7c7190c 151 LWIP_ASSERT("q->p != NULL", q->p != NULL);
GordonSin 0:0ed2a7c7190c 152 while (q) {
GordonSin 0:0ed2a7c7190c 153 r = q;
GordonSin 0:0ed2a7c7190c 154 q = q->next;
GordonSin 0:0ed2a7c7190c 155 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
GordonSin 0:0ed2a7c7190c 156 pbuf_free(r->p);
GordonSin 0:0ed2a7c7190c 157 memp_free(MEMP_ARP_QUEUE, r);
GordonSin 0:0ed2a7c7190c 158 }
GordonSin 0:0ed2a7c7190c 159 }
GordonSin 0:0ed2a7c7190c 160 #else /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 161
GordonSin 0:0ed2a7c7190c 162 /** Compatibility define: free the queued pbuf */
GordonSin 0:0ed2a7c7190c 163 #define free_etharp_q(q) pbuf_free(q)
GordonSin 0:0ed2a7c7190c 164
GordonSin 0:0ed2a7c7190c 165 #endif /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 166
GordonSin 0:0ed2a7c7190c 167 /** Clean up ARP table entries */
GordonSin 0:0ed2a7c7190c 168 static void
GordonSin 0:0ed2a7c7190c 169 free_entry(int i)
GordonSin 0:0ed2a7c7190c 170 {
GordonSin 0:0ed2a7c7190c 171 /* remove from SNMP ARP index tree */
GordonSin 0:0ed2a7c7190c 172 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
GordonSin 0:0ed2a7c7190c 173 /* and empty packet queue */
GordonSin 0:0ed2a7c7190c 174 if (arp_table[i].q != NULL) {
GordonSin 0:0ed2a7c7190c 175 /* remove all queued packets */
GordonSin 0:0ed2a7c7190c 176 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
GordonSin 0:0ed2a7c7190c 177 free_etharp_q(arp_table[i].q);
GordonSin 0:0ed2a7c7190c 178 arp_table[i].q = NULL;
GordonSin 0:0ed2a7c7190c 179 }
GordonSin 0:0ed2a7c7190c 180 /* recycle entry for re-use */
GordonSin 0:0ed2a7c7190c 181 arp_table[i].state = ETHARP_STATE_EMPTY;
GordonSin 0:0ed2a7c7190c 182 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 183 arp_table[i].static_entry = 0;
GordonSin 0:0ed2a7c7190c 184 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 185 #ifdef LWIP_DEBUG
GordonSin 0:0ed2a7c7190c 186 /* for debugging, clean out the complete entry */
GordonSin 0:0ed2a7c7190c 187 arp_table[i].ctime = 0;
GordonSin 0:0ed2a7c7190c 188 #if LWIP_SNMP
GordonSin 0:0ed2a7c7190c 189 arp_table[i].netif = NULL;
GordonSin 0:0ed2a7c7190c 190 #endif /* LWIP_SNMP */
GordonSin 0:0ed2a7c7190c 191 ip_addr_set_zero(&arp_table[i].ipaddr);
GordonSin 0:0ed2a7c7190c 192 arp_table[i].ethaddr = ethzero;
GordonSin 0:0ed2a7c7190c 193 #endif /* LWIP_DEBUG */
GordonSin 0:0ed2a7c7190c 194 }
GordonSin 0:0ed2a7c7190c 195
GordonSin 0:0ed2a7c7190c 196 /**
GordonSin 0:0ed2a7c7190c 197 * Clears expired entries in the ARP table.
GordonSin 0:0ed2a7c7190c 198 *
GordonSin 0:0ed2a7c7190c 199 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
GordonSin 0:0ed2a7c7190c 200 * in order to expire entries in the ARP table.
GordonSin 0:0ed2a7c7190c 201 */
GordonSin 0:0ed2a7c7190c 202 void
GordonSin 0:0ed2a7c7190c 203 etharp_tmr(void)
GordonSin 0:0ed2a7c7190c 204 {
GordonSin 0:0ed2a7c7190c 205 u8_t i;
GordonSin 0:0ed2a7c7190c 206
GordonSin 0:0ed2a7c7190c 207 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
GordonSin 0:0ed2a7c7190c 208 /* remove expired entries from the ARP table */
GordonSin 0:0ed2a7c7190c 209 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
GordonSin 0:0ed2a7c7190c 210 u8_t state = arp_table[i].state;
GordonSin 0:0ed2a7c7190c 211 if (state != ETHARP_STATE_EMPTY
GordonSin 0:0ed2a7c7190c 212 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 213 && (arp_table[i].static_entry == 0)
GordonSin 0:0ed2a7c7190c 214 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 215 ) {
GordonSin 0:0ed2a7c7190c 216 arp_table[i].ctime++;
GordonSin 0:0ed2a7c7190c 217 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
GordonSin 0:0ed2a7c7190c 218 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
GordonSin 0:0ed2a7c7190c 219 (arp_table[i].ctime >= ARP_MAXPENDING))) {
GordonSin 0:0ed2a7c7190c 220 /* pending or stable entry has become old! */
GordonSin 0:0ed2a7c7190c 221 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
GordonSin 0:0ed2a7c7190c 222 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
GordonSin 0:0ed2a7c7190c 223 /* clean up entries that have just been expired */
GordonSin 0:0ed2a7c7190c 224 free_entry(i);
GordonSin 0:0ed2a7c7190c 225 }
GordonSin 0:0ed2a7c7190c 226 #if ARP_QUEUEING
GordonSin 0:0ed2a7c7190c 227 /* still pending entry? (not expired) */
GordonSin 0:0ed2a7c7190c 228 if (arp_table[i].state == ETHARP_STATE_PENDING) {
GordonSin 0:0ed2a7c7190c 229 /* resend an ARP query here? */
GordonSin 0:0ed2a7c7190c 230 }
GordonSin 0:0ed2a7c7190c 231 #endif /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 232 }
GordonSin 0:0ed2a7c7190c 233 }
GordonSin 0:0ed2a7c7190c 234 }
GordonSin 0:0ed2a7c7190c 235
GordonSin 0:0ed2a7c7190c 236 /**
GordonSin 0:0ed2a7c7190c 237 * Search the ARP table for a matching or new entry.
GordonSin 0:0ed2a7c7190c 238 *
GordonSin 0:0ed2a7c7190c 239 * If an IP address is given, return a pending or stable ARP entry that matches
GordonSin 0:0ed2a7c7190c 240 * the address. If no match is found, create a new entry with this address set,
GordonSin 0:0ed2a7c7190c 241 * but in state ETHARP_EMPTY. The caller must check and possibly change the
GordonSin 0:0ed2a7c7190c 242 * state of the returned entry.
GordonSin 0:0ed2a7c7190c 243 *
GordonSin 0:0ed2a7c7190c 244 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
GordonSin 0:0ed2a7c7190c 245 *
GordonSin 0:0ed2a7c7190c 246 * In all cases, attempt to create new entries from an empty entry. If no
GordonSin 0:0ed2a7c7190c 247 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
GordonSin 0:0ed2a7c7190c 248 * old entries. Heuristic choose the least important entry for recycling.
GordonSin 0:0ed2a7c7190c 249 *
GordonSin 0:0ed2a7c7190c 250 * @param ipaddr IP address to find in ARP cache, or to add if not found.
GordonSin 0:0ed2a7c7190c 251 * @param flags @see definition of ETHARP_FLAG_*
GordonSin 0:0ed2a7c7190c 252 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
GordonSin 0:0ed2a7c7190c 253 *
GordonSin 0:0ed2a7c7190c 254 * @return The ARP entry index that matched or is created, ERR_MEM if no
GordonSin 0:0ed2a7c7190c 255 * entry is found or could be recycled.
GordonSin 0:0ed2a7c7190c 256 */
GordonSin 0:0ed2a7c7190c 257 static s8_t
GordonSin 0:0ed2a7c7190c 258 find_entry(ip_addr_t *ipaddr, u8_t flags)
GordonSin 0:0ed2a7c7190c 259 {
GordonSin 0:0ed2a7c7190c 260 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
GordonSin 0:0ed2a7c7190c 261 s8_t empty = ARP_TABLE_SIZE;
GordonSin 0:0ed2a7c7190c 262 u8_t i = 0, age_pending = 0, age_stable = 0;
GordonSin 0:0ed2a7c7190c 263 /* oldest entry with packets on queue */
GordonSin 0:0ed2a7c7190c 264 s8_t old_queue = ARP_TABLE_SIZE;
GordonSin 0:0ed2a7c7190c 265 /* its age */
GordonSin 0:0ed2a7c7190c 266 u8_t age_queue = 0;
GordonSin 0:0ed2a7c7190c 267
GordonSin 0:0ed2a7c7190c 268 /**
GordonSin 0:0ed2a7c7190c 269 * a) do a search through the cache, remember candidates
GordonSin 0:0ed2a7c7190c 270 * b) select candidate entry
GordonSin 0:0ed2a7c7190c 271 * c) create new entry
GordonSin 0:0ed2a7c7190c 272 */
GordonSin 0:0ed2a7c7190c 273
GordonSin 0:0ed2a7c7190c 274 /* a) in a single search sweep, do all of this
GordonSin 0:0ed2a7c7190c 275 * 1) remember the first empty entry (if any)
GordonSin 0:0ed2a7c7190c 276 * 2) remember the oldest stable entry (if any)
GordonSin 0:0ed2a7c7190c 277 * 3) remember the oldest pending entry without queued packets (if any)
GordonSin 0:0ed2a7c7190c 278 * 4) remember the oldest pending entry with queued packets (if any)
GordonSin 0:0ed2a7c7190c 279 * 5) search for a matching IP entry, either pending or stable
GordonSin 0:0ed2a7c7190c 280 * until 5 matches, or all entries are searched for.
GordonSin 0:0ed2a7c7190c 281 */
GordonSin 0:0ed2a7c7190c 282
GordonSin 0:0ed2a7c7190c 283 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
GordonSin 0:0ed2a7c7190c 284 u8_t state = arp_table[i].state;
GordonSin 0:0ed2a7c7190c 285 /* no empty entry found yet and now we do find one? */
GordonSin 0:0ed2a7c7190c 286 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
GordonSin 0:0ed2a7c7190c 287 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
GordonSin 0:0ed2a7c7190c 288 /* remember first empty entry */
GordonSin 0:0ed2a7c7190c 289 empty = i;
GordonSin 0:0ed2a7c7190c 290 } else if (state != ETHARP_STATE_EMPTY) {
GordonSin 0:0ed2a7c7190c 291 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE",
GordonSin 0:0ed2a7c7190c 292 state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE);
GordonSin 0:0ed2a7c7190c 293 /* if given, does IP address match IP address in ARP entry? */
GordonSin 0:0ed2a7c7190c 294 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
GordonSin 0:0ed2a7c7190c 295 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
GordonSin 0:0ed2a7c7190c 296 /* found exact IP address match, simply bail out */
GordonSin 0:0ed2a7c7190c 297 return i;
GordonSin 0:0ed2a7c7190c 298 }
GordonSin 0:0ed2a7c7190c 299 /* pending entry? */
GordonSin 0:0ed2a7c7190c 300 if (state == ETHARP_STATE_PENDING) {
GordonSin 0:0ed2a7c7190c 301 /* pending with queued packets? */
GordonSin 0:0ed2a7c7190c 302 if (arp_table[i].q != NULL) {
GordonSin 0:0ed2a7c7190c 303 if (arp_table[i].ctime >= age_queue) {
GordonSin 0:0ed2a7c7190c 304 old_queue = i;
GordonSin 0:0ed2a7c7190c 305 age_queue = arp_table[i].ctime;
GordonSin 0:0ed2a7c7190c 306 }
GordonSin 0:0ed2a7c7190c 307 } else
GordonSin 0:0ed2a7c7190c 308 /* pending without queued packets? */
GordonSin 0:0ed2a7c7190c 309 {
GordonSin 0:0ed2a7c7190c 310 if (arp_table[i].ctime >= age_pending) {
GordonSin 0:0ed2a7c7190c 311 old_pending = i;
GordonSin 0:0ed2a7c7190c 312 age_pending = arp_table[i].ctime;
GordonSin 0:0ed2a7c7190c 313 }
GordonSin 0:0ed2a7c7190c 314 }
GordonSin 0:0ed2a7c7190c 315 /* stable entry? */
GordonSin 0:0ed2a7c7190c 316 } else if (state == ETHARP_STATE_STABLE) {
GordonSin 0:0ed2a7c7190c 317 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 318 /* don't record old_stable for static entries since they never expire */
GordonSin 0:0ed2a7c7190c 319 if (arp_table[i].static_entry == 0)
GordonSin 0:0ed2a7c7190c 320 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 321 {
GordonSin 0:0ed2a7c7190c 322 /* remember entry with oldest stable entry in oldest, its age in maxtime */
GordonSin 0:0ed2a7c7190c 323 if (arp_table[i].ctime >= age_stable) {
GordonSin 0:0ed2a7c7190c 324 old_stable = i;
GordonSin 0:0ed2a7c7190c 325 age_stable = arp_table[i].ctime;
GordonSin 0:0ed2a7c7190c 326 }
GordonSin 0:0ed2a7c7190c 327 }
GordonSin 0:0ed2a7c7190c 328 }
GordonSin 0:0ed2a7c7190c 329 }
GordonSin 0:0ed2a7c7190c 330 }
GordonSin 0:0ed2a7c7190c 331 /* { we have no match } => try to create a new entry */
GordonSin 0:0ed2a7c7190c 332
GordonSin 0:0ed2a7c7190c 333 /* don't create new entry, only search? */
GordonSin 0:0ed2a7c7190c 334 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
GordonSin 0:0ed2a7c7190c 335 /* or no empty entry found and not allowed to recycle? */
GordonSin 0:0ed2a7c7190c 336 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
GordonSin 0:0ed2a7c7190c 337 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
GordonSin 0:0ed2a7c7190c 338 return (s8_t)ERR_MEM;
GordonSin 0:0ed2a7c7190c 339 }
GordonSin 0:0ed2a7c7190c 340
GordonSin 0:0ed2a7c7190c 341 /* b) choose the least destructive entry to recycle:
GordonSin 0:0ed2a7c7190c 342 * 1) empty entry
GordonSin 0:0ed2a7c7190c 343 * 2) oldest stable entry
GordonSin 0:0ed2a7c7190c 344 * 3) oldest pending entry without queued packets
GordonSin 0:0ed2a7c7190c 345 * 4) oldest pending entry with queued packets
GordonSin 0:0ed2a7c7190c 346 *
GordonSin 0:0ed2a7c7190c 347 * { ETHARP_FLAG_TRY_HARD is set at this point }
GordonSin 0:0ed2a7c7190c 348 */
GordonSin 0:0ed2a7c7190c 349
GordonSin 0:0ed2a7c7190c 350 /* 1) empty entry available? */
GordonSin 0:0ed2a7c7190c 351 if (empty < ARP_TABLE_SIZE) {
GordonSin 0:0ed2a7c7190c 352 i = empty;
GordonSin 0:0ed2a7c7190c 353 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
GordonSin 0:0ed2a7c7190c 354 } else {
GordonSin 0:0ed2a7c7190c 355 /* 2) found recyclable stable entry? */
GordonSin 0:0ed2a7c7190c 356 if (old_stable < ARP_TABLE_SIZE) {
GordonSin 0:0ed2a7c7190c 357 /* recycle oldest stable*/
GordonSin 0:0ed2a7c7190c 358 i = old_stable;
GordonSin 0:0ed2a7c7190c 359 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
GordonSin 0:0ed2a7c7190c 360 /* no queued packets should exist on stable entries */
GordonSin 0:0ed2a7c7190c 361 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
GordonSin 0:0ed2a7c7190c 362 /* 3) found recyclable pending entry without queued packets? */
GordonSin 0:0ed2a7c7190c 363 } else if (old_pending < ARP_TABLE_SIZE) {
GordonSin 0:0ed2a7c7190c 364 /* recycle oldest pending */
GordonSin 0:0ed2a7c7190c 365 i = old_pending;
GordonSin 0:0ed2a7c7190c 366 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
GordonSin 0:0ed2a7c7190c 367 /* 4) found recyclable pending entry with queued packets? */
GordonSin 0:0ed2a7c7190c 368 } else if (old_queue < ARP_TABLE_SIZE) {
GordonSin 0:0ed2a7c7190c 369 /* recycle oldest pending (queued packets are free in free_entry) */
GordonSin 0:0ed2a7c7190c 370 i = old_queue;
GordonSin 0:0ed2a7c7190c 371 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
GordonSin 0:0ed2a7c7190c 372 /* no empty or recyclable entries found */
GordonSin 0:0ed2a7c7190c 373 } else {
GordonSin 0:0ed2a7c7190c 374 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
GordonSin 0:0ed2a7c7190c 375 return (s8_t)ERR_MEM;
GordonSin 0:0ed2a7c7190c 376 }
GordonSin 0:0ed2a7c7190c 377
GordonSin 0:0ed2a7c7190c 378 /* { empty or recyclable entry found } */
GordonSin 0:0ed2a7c7190c 379 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
GordonSin 0:0ed2a7c7190c 380 free_entry(i);
GordonSin 0:0ed2a7c7190c 381 }
GordonSin 0:0ed2a7c7190c 382
GordonSin 0:0ed2a7c7190c 383 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
GordonSin 0:0ed2a7c7190c 384 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
GordonSin 0:0ed2a7c7190c 385 arp_table[i].state == ETHARP_STATE_EMPTY);
GordonSin 0:0ed2a7c7190c 386
GordonSin 0:0ed2a7c7190c 387 /* IP address given? */
GordonSin 0:0ed2a7c7190c 388 if (ipaddr != NULL) {
GordonSin 0:0ed2a7c7190c 389 /* set IP address */
GordonSin 0:0ed2a7c7190c 390 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
GordonSin 0:0ed2a7c7190c 391 }
GordonSin 0:0ed2a7c7190c 392 arp_table[i].ctime = 0;
GordonSin 0:0ed2a7c7190c 393 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 394 arp_table[i].static_entry = 0;
GordonSin 0:0ed2a7c7190c 395 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 396 return (err_t)i;
GordonSin 0:0ed2a7c7190c 397 }
GordonSin 0:0ed2a7c7190c 398
GordonSin 0:0ed2a7c7190c 399 /**
GordonSin 0:0ed2a7c7190c 400 * Send an IP packet on the network using netif->linkoutput
GordonSin 0:0ed2a7c7190c 401 * The ethernet header is filled in before sending.
GordonSin 0:0ed2a7c7190c 402 *
GordonSin 0:0ed2a7c7190c 403 * @params netif the lwIP network interface on which to send the packet
GordonSin 0:0ed2a7c7190c 404 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
GordonSin 0:0ed2a7c7190c 405 * @params src the source MAC address to be copied into the ethernet header
GordonSin 0:0ed2a7c7190c 406 * @params dst the destination MAC address to be copied into the ethernet header
GordonSin 0:0ed2a7c7190c 407 * @return ERR_OK if the packet was sent, any other err_t on failure
GordonSin 0:0ed2a7c7190c 408 */
GordonSin 0:0ed2a7c7190c 409 static err_t
GordonSin 0:0ed2a7c7190c 410 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
GordonSin 0:0ed2a7c7190c 411 {
GordonSin 0:0ed2a7c7190c 412 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 413
GordonSin 0:0ed2a7c7190c 414 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
GordonSin 0:0ed2a7c7190c 415 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
GordonSin 0:0ed2a7c7190c 416 ETHADDR32_COPY(&ethhdr->dest, dst);
GordonSin 0:0ed2a7c7190c 417 ETHADDR16_COPY(&ethhdr->src, src);
GordonSin 0:0ed2a7c7190c 418 ethhdr->type = PP_HTONS(ETHTYPE_IP);
GordonSin 0:0ed2a7c7190c 419 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
GordonSin 0:0ed2a7c7190c 420 /* send the packet */
GordonSin 0:0ed2a7c7190c 421 return netif->linkoutput(netif, p);
GordonSin 0:0ed2a7c7190c 422 }
GordonSin 0:0ed2a7c7190c 423
GordonSin 0:0ed2a7c7190c 424 /**
GordonSin 0:0ed2a7c7190c 425 * Update (or insert) a IP/MAC address pair in the ARP cache.
GordonSin 0:0ed2a7c7190c 426 *
GordonSin 0:0ed2a7c7190c 427 * If a pending entry is resolved, any queued packets will be sent
GordonSin 0:0ed2a7c7190c 428 * at this point.
GordonSin 0:0ed2a7c7190c 429 *
GordonSin 0:0ed2a7c7190c 430 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
GordonSin 0:0ed2a7c7190c 431 * @param ipaddr IP address of the inserted ARP entry.
GordonSin 0:0ed2a7c7190c 432 * @param ethaddr Ethernet address of the inserted ARP entry.
GordonSin 0:0ed2a7c7190c 433 * @param flags @see definition of ETHARP_FLAG_*
GordonSin 0:0ed2a7c7190c 434 *
GordonSin 0:0ed2a7c7190c 435 * @return
GordonSin 0:0ed2a7c7190c 436 * - ERR_OK Succesfully updated ARP cache.
GordonSin 0:0ed2a7c7190c 437 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
GordonSin 0:0ed2a7c7190c 438 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
GordonSin 0:0ed2a7c7190c 439 *
GordonSin 0:0ed2a7c7190c 440 * @see pbuf_free()
GordonSin 0:0ed2a7c7190c 441 */
GordonSin 0:0ed2a7c7190c 442 static err_t
GordonSin 0:0ed2a7c7190c 443 update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
GordonSin 0:0ed2a7c7190c 444 {
GordonSin 0:0ed2a7c7190c 445 s8_t i;
GordonSin 0:0ed2a7c7190c 446 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
GordonSin 0:0ed2a7c7190c 447 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
GordonSin 0:0ed2a7c7190c 448 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
GordonSin 0:0ed2a7c7190c 449 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
GordonSin 0:0ed2a7c7190c 450 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
GordonSin 0:0ed2a7c7190c 451 /* non-unicast address? */
GordonSin 0:0ed2a7c7190c 452 if (ip_addr_isany(ipaddr) ||
GordonSin 0:0ed2a7c7190c 453 ip_addr_isbroadcast(ipaddr, netif) ||
GordonSin 0:0ed2a7c7190c 454 ip_addr_ismulticast(ipaddr)) {
GordonSin 0:0ed2a7c7190c 455 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
GordonSin 0:0ed2a7c7190c 456 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 457 }
GordonSin 0:0ed2a7c7190c 458 /* find or create ARP entry */
GordonSin 0:0ed2a7c7190c 459 i = find_entry(ipaddr, flags);
GordonSin 0:0ed2a7c7190c 460 /* bail out if no entry could be found */
GordonSin 0:0ed2a7c7190c 461 if (i < 0) {
GordonSin 0:0ed2a7c7190c 462 return (err_t)i;
GordonSin 0:0ed2a7c7190c 463 }
GordonSin 0:0ed2a7c7190c 464
GordonSin 0:0ed2a7c7190c 465 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 466 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
GordonSin 0:0ed2a7c7190c 467 /* record static type */
GordonSin 0:0ed2a7c7190c 468 arp_table[i].static_entry = 1;
GordonSin 0:0ed2a7c7190c 469 }
GordonSin 0:0ed2a7c7190c 470 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 471
GordonSin 0:0ed2a7c7190c 472 /* mark it stable */
GordonSin 0:0ed2a7c7190c 473 arp_table[i].state = ETHARP_STATE_STABLE;
GordonSin 0:0ed2a7c7190c 474
GordonSin 0:0ed2a7c7190c 475 #if LWIP_SNMP
GordonSin 0:0ed2a7c7190c 476 /* record network interface */
GordonSin 0:0ed2a7c7190c 477 arp_table[i].netif = netif;
GordonSin 0:0ed2a7c7190c 478 #endif /* LWIP_SNMP */
GordonSin 0:0ed2a7c7190c 479 /* insert in SNMP ARP index tree */
GordonSin 0:0ed2a7c7190c 480 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
GordonSin 0:0ed2a7c7190c 481
GordonSin 0:0ed2a7c7190c 482 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
GordonSin 0:0ed2a7c7190c 483 /* update address */
GordonSin 0:0ed2a7c7190c 484 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
GordonSin 0:0ed2a7c7190c 485 /* reset time stamp */
GordonSin 0:0ed2a7c7190c 486 arp_table[i].ctime = 0;
GordonSin 0:0ed2a7c7190c 487 /* this is where we will send out queued packets! */
GordonSin 0:0ed2a7c7190c 488 #if ARP_QUEUEING
GordonSin 0:0ed2a7c7190c 489 while (arp_table[i].q != NULL) {
GordonSin 0:0ed2a7c7190c 490 struct pbuf *p;
GordonSin 0:0ed2a7c7190c 491 /* remember remainder of queue */
GordonSin 0:0ed2a7c7190c 492 struct etharp_q_entry *q = arp_table[i].q;
GordonSin 0:0ed2a7c7190c 493 /* pop first item off the queue */
GordonSin 0:0ed2a7c7190c 494 arp_table[i].q = q->next;
GordonSin 0:0ed2a7c7190c 495 /* get the packet pointer */
GordonSin 0:0ed2a7c7190c 496 p = q->p;
GordonSin 0:0ed2a7c7190c 497 /* now queue entry can be freed */
GordonSin 0:0ed2a7c7190c 498 memp_free(MEMP_ARP_QUEUE, q);
GordonSin 0:0ed2a7c7190c 499 #else /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 500 if (arp_table[i].q != NULL) {
GordonSin 0:0ed2a7c7190c 501 struct pbuf *p = arp_table[i].q;
GordonSin 0:0ed2a7c7190c 502 arp_table[i].q = NULL;
GordonSin 0:0ed2a7c7190c 503 #endif /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 504 /* send the queued IP packet */
GordonSin 0:0ed2a7c7190c 505 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
GordonSin 0:0ed2a7c7190c 506 /* free the queued IP packet */
GordonSin 0:0ed2a7c7190c 507 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 508 }
GordonSin 0:0ed2a7c7190c 509 return ERR_OK;
GordonSin 0:0ed2a7c7190c 510 }
GordonSin 0:0ed2a7c7190c 511
GordonSin 0:0ed2a7c7190c 512 #if ETHARP_SUPPORT_STATIC_ENTRIES
GordonSin 0:0ed2a7c7190c 513 /** Add a new static entry to the ARP table. If an entry exists for the
GordonSin 0:0ed2a7c7190c 514 * specified IP address, this entry is overwritten.
GordonSin 0:0ed2a7c7190c 515 * If packets are queued for the specified IP address, they are sent out.
GordonSin 0:0ed2a7c7190c 516 *
GordonSin 0:0ed2a7c7190c 517 * @param ipaddr IP address for the new static entry
GordonSin 0:0ed2a7c7190c 518 * @param ethaddr ethernet address for the new static entry
GordonSin 0:0ed2a7c7190c 519 * @return @see return values of etharp_add_static_entry
GordonSin 0:0ed2a7c7190c 520 */
GordonSin 0:0ed2a7c7190c 521 err_t
GordonSin 0:0ed2a7c7190c 522 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
GordonSin 0:0ed2a7c7190c 523 {
GordonSin 0:0ed2a7c7190c 524 struct netif *netif;
GordonSin 0:0ed2a7c7190c 525 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",
GordonSin 0:0ed2a7c7190c 526 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
GordonSin 0:0ed2a7c7190c 527 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
GordonSin 0:0ed2a7c7190c 528 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
GordonSin 0:0ed2a7c7190c 529
GordonSin 0:0ed2a7c7190c 530 netif = ip_route(ipaddr);
GordonSin 0:0ed2a7c7190c 531 if (netif == NULL) {
GordonSin 0:0ed2a7c7190c 532 return ERR_RTE;
GordonSin 0:0ed2a7c7190c 533 }
GordonSin 0:0ed2a7c7190c 534
GordonSin 0:0ed2a7c7190c 535 return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
GordonSin 0:0ed2a7c7190c 536 }
GordonSin 0:0ed2a7c7190c 537
GordonSin 0:0ed2a7c7190c 538 /** Remove a static entry from the ARP table previously added with a call to
GordonSin 0:0ed2a7c7190c 539 * etharp_add_static_entry.
GordonSin 0:0ed2a7c7190c 540 *
GordonSin 0:0ed2a7c7190c 541 * @param ipaddr IP address of the static entry to remove
GordonSin 0:0ed2a7c7190c 542 * @return ERR_OK: entry removed
GordonSin 0:0ed2a7c7190c 543 * ERR_MEM: entry wasn't found
GordonSin 0:0ed2a7c7190c 544 * ERR_ARG: entry wasn't a static entry but a dynamic one
GordonSin 0:0ed2a7c7190c 545 */
GordonSin 0:0ed2a7c7190c 546 err_t
GordonSin 0:0ed2a7c7190c 547 etharp_remove_static_entry(ip_addr_t *ipaddr)
GordonSin 0:0ed2a7c7190c 548 {
GordonSin 0:0ed2a7c7190c 549 s8_t i;
GordonSin 0:0ed2a7c7190c 550 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 551 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
GordonSin 0:0ed2a7c7190c 552
GordonSin 0:0ed2a7c7190c 553 /* find or create ARP entry */
GordonSin 0:0ed2a7c7190c 554 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
GordonSin 0:0ed2a7c7190c 555 /* bail out if no entry could be found */
GordonSin 0:0ed2a7c7190c 556 if (i < 0) {
GordonSin 0:0ed2a7c7190c 557 return (err_t)i;
GordonSin 0:0ed2a7c7190c 558 }
GordonSin 0:0ed2a7c7190c 559
GordonSin 0:0ed2a7c7190c 560 if ((arp_table[i].state != ETHARP_STATE_STABLE) ||
GordonSin 0:0ed2a7c7190c 561 (arp_table[i].static_entry == 0)) {
GordonSin 0:0ed2a7c7190c 562 /* entry wasn't a static entry, cannot remove it */
GordonSin 0:0ed2a7c7190c 563 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 564 }
GordonSin 0:0ed2a7c7190c 565 /* entry found, free it */
GordonSin 0:0ed2a7c7190c 566 free_entry(i);
GordonSin 0:0ed2a7c7190c 567 return ERR_OK;
GordonSin 0:0ed2a7c7190c 568 }
GordonSin 0:0ed2a7c7190c 569 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
GordonSin 0:0ed2a7c7190c 570
GordonSin 0:0ed2a7c7190c 571 /**
GordonSin 0:0ed2a7c7190c 572 * Finds (stable) ethernet/IP address pair from ARP table
GordonSin 0:0ed2a7c7190c 573 * using interface and IP address index.
GordonSin 0:0ed2a7c7190c 574 * @note the addresses in the ARP table are in network order!
GordonSin 0:0ed2a7c7190c 575 *
GordonSin 0:0ed2a7c7190c 576 * @param netif points to interface index
GordonSin 0:0ed2a7c7190c 577 * @param ipaddr points to the (network order) IP address index
GordonSin 0:0ed2a7c7190c 578 * @param eth_ret points to return pointer
GordonSin 0:0ed2a7c7190c 579 * @param ip_ret points to return pointer
GordonSin 0:0ed2a7c7190c 580 * @return table index if found, -1 otherwise
GordonSin 0:0ed2a7c7190c 581 */
GordonSin 0:0ed2a7c7190c 582 s8_t
GordonSin 0:0ed2a7c7190c 583 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
GordonSin 0:0ed2a7c7190c 584 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
GordonSin 0:0ed2a7c7190c 585 {
GordonSin 0:0ed2a7c7190c 586 s8_t i;
GordonSin 0:0ed2a7c7190c 587
GordonSin 0:0ed2a7c7190c 588 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
GordonSin 0:0ed2a7c7190c 589 eth_ret != NULL && ip_ret != NULL);
GordonSin 0:0ed2a7c7190c 590
GordonSin 0:0ed2a7c7190c 591 LWIP_UNUSED_ARG(netif);
GordonSin 0:0ed2a7c7190c 592
GordonSin 0:0ed2a7c7190c 593 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
GordonSin 0:0ed2a7c7190c 594 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
GordonSin 0:0ed2a7c7190c 595 *eth_ret = &arp_table[i].ethaddr;
GordonSin 0:0ed2a7c7190c 596 *ip_ret = &arp_table[i].ipaddr;
GordonSin 0:0ed2a7c7190c 597 return i;
GordonSin 0:0ed2a7c7190c 598 }
GordonSin 0:0ed2a7c7190c 599 return -1;
GordonSin 0:0ed2a7c7190c 600 }
GordonSin 0:0ed2a7c7190c 601
GordonSin 0:0ed2a7c7190c 602 #if ETHARP_TRUST_IP_MAC
GordonSin 0:0ed2a7c7190c 603 /**
GordonSin 0:0ed2a7c7190c 604 * Updates the ARP table using the given IP packet.
GordonSin 0:0ed2a7c7190c 605 *
GordonSin 0:0ed2a7c7190c 606 * Uses the incoming IP packet's source address to update the
GordonSin 0:0ed2a7c7190c 607 * ARP cache for the local network. The function does not alter
GordonSin 0:0ed2a7c7190c 608 * or free the packet. This function must be called before the
GordonSin 0:0ed2a7c7190c 609 * packet p is passed to the IP layer.
GordonSin 0:0ed2a7c7190c 610 *
GordonSin 0:0ed2a7c7190c 611 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
GordonSin 0:0ed2a7c7190c 612 * @param p The IP packet that arrived on netif.
GordonSin 0:0ed2a7c7190c 613 *
GordonSin 0:0ed2a7c7190c 614 * @return NULL
GordonSin 0:0ed2a7c7190c 615 *
GordonSin 0:0ed2a7c7190c 616 * @see pbuf_free()
GordonSin 0:0ed2a7c7190c 617 */
GordonSin 0:0ed2a7c7190c 618 static void
GordonSin 0:0ed2a7c7190c 619 etharp_ip_input(struct netif *netif, struct pbuf *p)
GordonSin 0:0ed2a7c7190c 620 {
GordonSin 0:0ed2a7c7190c 621 struct eth_hdr *ethhdr;
GordonSin 0:0ed2a7c7190c 622 struct ip_hdr *iphdr;
GordonSin 0:0ed2a7c7190c 623 ip_addr_t iphdr_src;
GordonSin 0:0ed2a7c7190c 624 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
GordonSin 0:0ed2a7c7190c 625
GordonSin 0:0ed2a7c7190c 626 /* Only insert an entry if the source IP address of the
GordonSin 0:0ed2a7c7190c 627 incoming IP packet comes from a host on the local network. */
GordonSin 0:0ed2a7c7190c 628 ethhdr = (struct eth_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 629 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
GordonSin 0:0ed2a7c7190c 630 #if ETHARP_SUPPORT_VLAN
GordonSin 0:0ed2a7c7190c 631 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
GordonSin 0:0ed2a7c7190c 632 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
GordonSin 0:0ed2a7c7190c 633 }
GordonSin 0:0ed2a7c7190c 634 #endif /* ETHARP_SUPPORT_VLAN */
GordonSin 0:0ed2a7c7190c 635
GordonSin 0:0ed2a7c7190c 636 ip_addr_copy(iphdr_src, iphdr->src);
GordonSin 0:0ed2a7c7190c 637
GordonSin 0:0ed2a7c7190c 638 /* source is not on the local network? */
GordonSin 0:0ed2a7c7190c 639 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
GordonSin 0:0ed2a7c7190c 640 /* do nothing */
GordonSin 0:0ed2a7c7190c 641 return;
GordonSin 0:0ed2a7c7190c 642 }
GordonSin 0:0ed2a7c7190c 643
GordonSin 0:0ed2a7c7190c 644 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
GordonSin 0:0ed2a7c7190c 645 /* update the source IP address in the cache, if present */
GordonSin 0:0ed2a7c7190c 646 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
GordonSin 0:0ed2a7c7190c 647 * back soon (for example, if the destination IP address is ours. */
GordonSin 0:0ed2a7c7190c 648 update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
GordonSin 0:0ed2a7c7190c 649 }
GordonSin 0:0ed2a7c7190c 650 #endif /* ETHARP_TRUST_IP_MAC */
GordonSin 0:0ed2a7c7190c 651
GordonSin 0:0ed2a7c7190c 652 /**
GordonSin 0:0ed2a7c7190c 653 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
GordonSin 0:0ed2a7c7190c 654 * send out queued IP packets. Updates cache with snooped address pairs.
GordonSin 0:0ed2a7c7190c 655 *
GordonSin 0:0ed2a7c7190c 656 * Should be called for incoming ARP packets. The pbuf in the argument
GordonSin 0:0ed2a7c7190c 657 * is freed by this function.
GordonSin 0:0ed2a7c7190c 658 *
GordonSin 0:0ed2a7c7190c 659 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
GordonSin 0:0ed2a7c7190c 660 * @param ethaddr Ethernet address of netif.
GordonSin 0:0ed2a7c7190c 661 * @param p The ARP packet that arrived on netif. Is freed by this function.
GordonSin 0:0ed2a7c7190c 662 *
GordonSin 0:0ed2a7c7190c 663 * @return NULL
GordonSin 0:0ed2a7c7190c 664 *
GordonSin 0:0ed2a7c7190c 665 * @see pbuf_free()
GordonSin 0:0ed2a7c7190c 666 */
GordonSin 0:0ed2a7c7190c 667 static void
GordonSin 0:0ed2a7c7190c 668 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
GordonSin 0:0ed2a7c7190c 669 {
GordonSin 0:0ed2a7c7190c 670 struct etharp_hdr *hdr;
GordonSin 0:0ed2a7c7190c 671 struct eth_hdr *ethhdr;
GordonSin 0:0ed2a7c7190c 672 /* these are aligned properly, whereas the ARP header fields might not be */
GordonSin 0:0ed2a7c7190c 673 ip_addr_t sipaddr, dipaddr;
GordonSin 0:0ed2a7c7190c 674 u8_t for_us;
GordonSin 0:0ed2a7c7190c 675 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 676 const u8_t * ethdst_hwaddr;
GordonSin 0:0ed2a7c7190c 677 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 678
GordonSin 0:0ed2a7c7190c 679 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
GordonSin 0:0ed2a7c7190c 680
GordonSin 0:0ed2a7c7190c 681 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
GordonSin 0:0ed2a7c7190c 682 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
GordonSin 0:0ed2a7c7190c 683 if (p->len < SIZEOF_ETHARP_PACKET) {
GordonSin 0:0ed2a7c7190c 684 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
GordonSin 0:0ed2a7c7190c 685 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
GordonSin 0:0ed2a7c7190c 686 (s16_t)SIZEOF_ETHARP_PACKET));
GordonSin 0:0ed2a7c7190c 687 ETHARP_STATS_INC(etharp.lenerr);
GordonSin 0:0ed2a7c7190c 688 ETHARP_STATS_INC(etharp.drop);
GordonSin 0:0ed2a7c7190c 689 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 690 return;
GordonSin 0:0ed2a7c7190c 691 }
GordonSin 0:0ed2a7c7190c 692
GordonSin 0:0ed2a7c7190c 693 ethhdr = (struct eth_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 694 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
GordonSin 0:0ed2a7c7190c 695 #if ETHARP_SUPPORT_VLAN
GordonSin 0:0ed2a7c7190c 696 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
GordonSin 0:0ed2a7c7190c 697 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
GordonSin 0:0ed2a7c7190c 698 }
GordonSin 0:0ed2a7c7190c 699 #endif /* ETHARP_SUPPORT_VLAN */
GordonSin 0:0ed2a7c7190c 700
GordonSin 0:0ed2a7c7190c 701 /* RFC 826 "Packet Reception": */
GordonSin 0:0ed2a7c7190c 702 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
GordonSin 0:0ed2a7c7190c 703 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
GordonSin 0:0ed2a7c7190c 704 (hdr->protolen != sizeof(ip_addr_t)) ||
GordonSin 0:0ed2a7c7190c 705 (hdr->proto != PP_HTONS(ETHTYPE_IP))) {
GordonSin 0:0ed2a7c7190c 706 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
GordonSin 0:0ed2a7c7190c 707 ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
GordonSin 0:0ed2a7c7190c 708 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen));
GordonSin 0:0ed2a7c7190c 709 ETHARP_STATS_INC(etharp.proterr);
GordonSin 0:0ed2a7c7190c 710 ETHARP_STATS_INC(etharp.drop);
GordonSin 0:0ed2a7c7190c 711 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 712 return;
GordonSin 0:0ed2a7c7190c 713 }
GordonSin 0:0ed2a7c7190c 714 ETHARP_STATS_INC(etharp.recv);
GordonSin 0:0ed2a7c7190c 715
GordonSin 0:0ed2a7c7190c 716 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 717 /* We have to check if a host already has configured our random
GordonSin 0:0ed2a7c7190c 718 * created link local address and continously check if there is
GordonSin 0:0ed2a7c7190c 719 * a host with this IP-address so we can detect collisions */
GordonSin 0:0ed2a7c7190c 720 autoip_arp_reply(netif, hdr);
GordonSin 0:0ed2a7c7190c 721 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 722
GordonSin 0:0ed2a7c7190c 723 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
GordonSin 0:0ed2a7c7190c 724 * structure packing (not using structure copy which breaks strict-aliasing rules). */
GordonSin 0:0ed2a7c7190c 725 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
GordonSin 0:0ed2a7c7190c 726 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
GordonSin 0:0ed2a7c7190c 727
GordonSin 0:0ed2a7c7190c 728 /* this interface is not configured? */
GordonSin 0:0ed2a7c7190c 729 if (ip_addr_isany(&netif->ip_addr)) {
GordonSin 0:0ed2a7c7190c 730 for_us = 0;
GordonSin 0:0ed2a7c7190c 731 } else {
GordonSin 0:0ed2a7c7190c 732 /* ARP packet directed to us? */
GordonSin 0:0ed2a7c7190c 733 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
GordonSin 0:0ed2a7c7190c 734 }
GordonSin 0:0ed2a7c7190c 735
GordonSin 0:0ed2a7c7190c 736 /* ARP message directed to us?
GordonSin 0:0ed2a7c7190c 737 -> add IP address in ARP cache; assume requester wants to talk to us,
GordonSin 0:0ed2a7c7190c 738 can result in directly sending the queued packets for this host.
GordonSin 0:0ed2a7c7190c 739 ARP message not directed to us?
GordonSin 0:0ed2a7c7190c 740 -> update the source IP address in the cache, if present */
GordonSin 0:0ed2a7c7190c 741 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
GordonSin 0:0ed2a7c7190c 742 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
GordonSin 0:0ed2a7c7190c 743
GordonSin 0:0ed2a7c7190c 744 /* now act on the message itself */
GordonSin 0:0ed2a7c7190c 745 switch (hdr->opcode) {
GordonSin 0:0ed2a7c7190c 746 /* ARP request? */
GordonSin 0:0ed2a7c7190c 747 case PP_HTONS(ARP_REQUEST):
GordonSin 0:0ed2a7c7190c 748 /* ARP request. If it asked for our address, we send out a
GordonSin 0:0ed2a7c7190c 749 * reply. In any case, we time-stamp any existing ARP entry,
GordonSin 0:0ed2a7c7190c 750 * and possiby send out an IP packet that was queued on it. */
GordonSin 0:0ed2a7c7190c 751
GordonSin 0:0ed2a7c7190c 752 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
GordonSin 0:0ed2a7c7190c 753 /* ARP request for our address? */
GordonSin 0:0ed2a7c7190c 754 if (for_us) {
GordonSin 0:0ed2a7c7190c 755
GordonSin 0:0ed2a7c7190c 756 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
GordonSin 0:0ed2a7c7190c 757 /* Re-use pbuf to send ARP reply.
GordonSin 0:0ed2a7c7190c 758 Since we are re-using an existing pbuf, we can't call etharp_raw since
GordonSin 0:0ed2a7c7190c 759 that would allocate a new pbuf. */
GordonSin 0:0ed2a7c7190c 760 hdr->opcode = htons(ARP_REPLY);
GordonSin 0:0ed2a7c7190c 761
GordonSin 0:0ed2a7c7190c 762 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
GordonSin 0:0ed2a7c7190c 763 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
GordonSin 0:0ed2a7c7190c 764
GordonSin 0:0ed2a7c7190c 765 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
GordonSin 0:0ed2a7c7190c 766 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
GordonSin 0:0ed2a7c7190c 767 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 768 /* If we are using Link-Local, all ARP packets that contain a Link-Local
GordonSin 0:0ed2a7c7190c 769 * 'sender IP address' MUST be sent using link-layer broadcast instead of
GordonSin 0:0ed2a7c7190c 770 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
GordonSin 0:0ed2a7c7190c 771 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
GordonSin 0:0ed2a7c7190c 772 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 773
GordonSin 0:0ed2a7c7190c 774 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
GordonSin 0:0ed2a7c7190c 775 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 776 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
GordonSin 0:0ed2a7c7190c 777 #else /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 778 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
GordonSin 0:0ed2a7c7190c 779 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 780 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
GordonSin 0:0ed2a7c7190c 781 ETHADDR16_COPY(&ethhdr->src, ethaddr);
GordonSin 0:0ed2a7c7190c 782
GordonSin 0:0ed2a7c7190c 783 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
GordonSin 0:0ed2a7c7190c 784 are already correct, we tested that before */
GordonSin 0:0ed2a7c7190c 785
GordonSin 0:0ed2a7c7190c 786 /* return ARP reply */
GordonSin 0:0ed2a7c7190c 787 netif->linkoutput(netif, p);
GordonSin 0:0ed2a7c7190c 788 /* we are not configured? */
GordonSin 0:0ed2a7c7190c 789 } else if (ip_addr_isany(&netif->ip_addr)) {
GordonSin 0:0ed2a7c7190c 790 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
GordonSin 0:0ed2a7c7190c 791 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
GordonSin 0:0ed2a7c7190c 792 /* request was not directed to us */
GordonSin 0:0ed2a7c7190c 793 } else {
GordonSin 0:0ed2a7c7190c 794 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
GordonSin 0:0ed2a7c7190c 795 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
GordonSin 0:0ed2a7c7190c 796 }
GordonSin 0:0ed2a7c7190c 797 break;
GordonSin 0:0ed2a7c7190c 798 case PP_HTONS(ARP_REPLY):
GordonSin 0:0ed2a7c7190c 799 /* ARP reply. We already updated the ARP cache earlier. */
GordonSin 0:0ed2a7c7190c 800 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
GordonSin 0:0ed2a7c7190c 801 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
GordonSin 0:0ed2a7c7190c 802 /* DHCP wants to know about ARP replies from any host with an
GordonSin 0:0ed2a7c7190c 803 * IP address also offered to us by the DHCP server. We do not
GordonSin 0:0ed2a7c7190c 804 * want to take a duplicate IP address on a single network.
GordonSin 0:0ed2a7c7190c 805 * @todo How should we handle redundant (fail-over) interfaces? */
GordonSin 0:0ed2a7c7190c 806 dhcp_arp_reply(netif, &sipaddr);
GordonSin 0:0ed2a7c7190c 807 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
GordonSin 0:0ed2a7c7190c 808 break;
GordonSin 0:0ed2a7c7190c 809 default:
GordonSin 0:0ed2a7c7190c 810 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
GordonSin 0:0ed2a7c7190c 811 ETHARP_STATS_INC(etharp.err);
GordonSin 0:0ed2a7c7190c 812 break;
GordonSin 0:0ed2a7c7190c 813 }
GordonSin 0:0ed2a7c7190c 814 /* free ARP packet */
GordonSin 0:0ed2a7c7190c 815 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 816 }
GordonSin 0:0ed2a7c7190c 817
GordonSin 0:0ed2a7c7190c 818 /**
GordonSin 0:0ed2a7c7190c 819 * Resolve and fill-in Ethernet address header for outgoing IP packet.
GordonSin 0:0ed2a7c7190c 820 *
GordonSin 0:0ed2a7c7190c 821 * For IP multicast and broadcast, corresponding Ethernet addresses
GordonSin 0:0ed2a7c7190c 822 * are selected and the packet is transmitted on the link.
GordonSin 0:0ed2a7c7190c 823 *
GordonSin 0:0ed2a7c7190c 824 * For unicast addresses, the packet is submitted to etharp_query(). In
GordonSin 0:0ed2a7c7190c 825 * case the IP address is outside the local network, the IP address of
GordonSin 0:0ed2a7c7190c 826 * the gateway is used.
GordonSin 0:0ed2a7c7190c 827 *
GordonSin 0:0ed2a7c7190c 828 * @param netif The lwIP network interface which the IP packet will be sent on.
GordonSin 0:0ed2a7c7190c 829 * @param q The pbuf(s) containing the IP packet to be sent.
GordonSin 0:0ed2a7c7190c 830 * @param ipaddr The IP address of the packet destination.
GordonSin 0:0ed2a7c7190c 831 *
GordonSin 0:0ed2a7c7190c 832 * @return
GordonSin 0:0ed2a7c7190c 833 * - ERR_RTE No route to destination (no gateway to external networks),
GordonSin 0:0ed2a7c7190c 834 * or the return type of either etharp_query() or etharp_send_ip().
GordonSin 0:0ed2a7c7190c 835 */
GordonSin 0:0ed2a7c7190c 836 err_t
GordonSin 0:0ed2a7c7190c 837 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
GordonSin 0:0ed2a7c7190c 838 {
GordonSin 0:0ed2a7c7190c 839 struct eth_addr *dest, mcastaddr;
GordonSin 0:0ed2a7c7190c 840
GordonSin 0:0ed2a7c7190c 841 /* make room for Ethernet header - should not fail */
GordonSin 0:0ed2a7c7190c 842 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
GordonSin 0:0ed2a7c7190c 843 /* bail out */
GordonSin 0:0ed2a7c7190c 844 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 845 ("etharp_output: could not allocate room for header.\n"));
GordonSin 0:0ed2a7c7190c 846 LINK_STATS_INC(link.lenerr);
GordonSin 0:0ed2a7c7190c 847 return ERR_BUF;
GordonSin 0:0ed2a7c7190c 848 }
GordonSin 0:0ed2a7c7190c 849
GordonSin 0:0ed2a7c7190c 850 /* assume unresolved Ethernet address */
GordonSin 0:0ed2a7c7190c 851 dest = NULL;
GordonSin 0:0ed2a7c7190c 852 /* Determine on destination hardware address. Broadcasts and multicasts
GordonSin 0:0ed2a7c7190c 853 * are special, other IP addresses are looked up in the ARP table. */
GordonSin 0:0ed2a7c7190c 854
GordonSin 0:0ed2a7c7190c 855 /* broadcast destination IP address? */
GordonSin 0:0ed2a7c7190c 856 if (ip_addr_isbroadcast(ipaddr, netif)) {
GordonSin 0:0ed2a7c7190c 857 /* broadcast on Ethernet also */
GordonSin 0:0ed2a7c7190c 858 dest = (struct eth_addr *)&ethbroadcast;
GordonSin 0:0ed2a7c7190c 859 /* multicast destination IP address? */
GordonSin 0:0ed2a7c7190c 860 } else if (ip_addr_ismulticast(ipaddr)) {
GordonSin 0:0ed2a7c7190c 861 /* Hash IP multicast address to MAC address.*/
GordonSin 0:0ed2a7c7190c 862 mcastaddr.addr[0] = 0x01;
GordonSin 0:0ed2a7c7190c 863 mcastaddr.addr[1] = 0x00;
GordonSin 0:0ed2a7c7190c 864 mcastaddr.addr[2] = 0x5e;
GordonSin 0:0ed2a7c7190c 865 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
GordonSin 0:0ed2a7c7190c 866 mcastaddr.addr[4] = ip4_addr3(ipaddr);
GordonSin 0:0ed2a7c7190c 867 mcastaddr.addr[5] = ip4_addr4(ipaddr);
GordonSin 0:0ed2a7c7190c 868 /* destination Ethernet address is multicast */
GordonSin 0:0ed2a7c7190c 869 dest = &mcastaddr;
GordonSin 0:0ed2a7c7190c 870 /* unicast destination IP address? */
GordonSin 0:0ed2a7c7190c 871 } else {
GordonSin 0:0ed2a7c7190c 872 /* outside local network? */
GordonSin 0:0ed2a7c7190c 873 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
GordonSin 0:0ed2a7c7190c 874 !ip_addr_islinklocal(ipaddr)) {
GordonSin 0:0ed2a7c7190c 875 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 876 struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
GordonSin 0:0ed2a7c7190c 877 sizeof(struct eth_hdr));
GordonSin 0:0ed2a7c7190c 878 /* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
GordonSin 0:0ed2a7c7190c 879 a link-local source address must always be "directly to its destination
GordonSin 0:0ed2a7c7190c 880 on the same physical link. The host MUST NOT send the packet to any
GordonSin 0:0ed2a7c7190c 881 router for forwarding". */
GordonSin 0:0ed2a7c7190c 882 if (!ip_addr_islinklocal(&iphdr->src))
GordonSin 0:0ed2a7c7190c 883 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 884 {
GordonSin 0:0ed2a7c7190c 885 /* interface has default gateway? */
GordonSin 0:0ed2a7c7190c 886 if (!ip_addr_isany(&netif->gw)) {
GordonSin 0:0ed2a7c7190c 887 /* send to hardware address of default gateway IP address */
GordonSin 0:0ed2a7c7190c 888 ipaddr = &(netif->gw);
GordonSin 0:0ed2a7c7190c 889 /* no default gateway available */
GordonSin 0:0ed2a7c7190c 890 } else {
GordonSin 0:0ed2a7c7190c 891 /* no route to destination error (default gateway missing) */
GordonSin 0:0ed2a7c7190c 892 return ERR_RTE;
GordonSin 0:0ed2a7c7190c 893 }
GordonSin 0:0ed2a7c7190c 894 }
GordonSin 0:0ed2a7c7190c 895 }
GordonSin 0:0ed2a7c7190c 896 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 897 if (netif->addr_hint != NULL) {
GordonSin 0:0ed2a7c7190c 898 /* per-pcb cached entry was given */
GordonSin 0:0ed2a7c7190c 899 u8_t etharp_cached_entry = *(netif->addr_hint);
GordonSin 0:0ed2a7c7190c 900 if (etharp_cached_entry < ARP_TABLE_SIZE) {
GordonSin 0:0ed2a7c7190c 901 #endif /* LWIP_NETIF_HWADDRHINT */
GordonSin 0:0ed2a7c7190c 902 if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
GordonSin 0:0ed2a7c7190c 903 (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
GordonSin 0:0ed2a7c7190c 904 /* the per-pcb-cached entry is stable and the right one! */
GordonSin 0:0ed2a7c7190c 905 ETHARP_STATS_INC(etharp.cachehit);
GordonSin 0:0ed2a7c7190c 906 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
GordonSin 0:0ed2a7c7190c 907 &arp_table[etharp_cached_entry].ethaddr);
GordonSin 0:0ed2a7c7190c 908 }
GordonSin 0:0ed2a7c7190c 909 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 910 }
GordonSin 0:0ed2a7c7190c 911 }
GordonSin 0:0ed2a7c7190c 912 #endif /* LWIP_NETIF_HWADDRHINT */
GordonSin 0:0ed2a7c7190c 913 /* queue on destination Ethernet address belonging to ipaddr */
GordonSin 0:0ed2a7c7190c 914 return etharp_query(netif, ipaddr, q);
GordonSin 0:0ed2a7c7190c 915 }
GordonSin 0:0ed2a7c7190c 916
GordonSin 0:0ed2a7c7190c 917 /* continuation for multicast/broadcast destinations */
GordonSin 0:0ed2a7c7190c 918 /* obtain source Ethernet address of the given interface */
GordonSin 0:0ed2a7c7190c 919 /* send packet directly on the link */
GordonSin 0:0ed2a7c7190c 920 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
GordonSin 0:0ed2a7c7190c 921 }
GordonSin 0:0ed2a7c7190c 922
GordonSin 0:0ed2a7c7190c 923 /**
GordonSin 0:0ed2a7c7190c 924 * Send an ARP request for the given IP address and/or queue a packet.
GordonSin 0:0ed2a7c7190c 925 *
GordonSin 0:0ed2a7c7190c 926 * If the IP address was not yet in the cache, a pending ARP cache entry
GordonSin 0:0ed2a7c7190c 927 * is added and an ARP request is sent for the given address. The packet
GordonSin 0:0ed2a7c7190c 928 * is queued on this entry.
GordonSin 0:0ed2a7c7190c 929 *
GordonSin 0:0ed2a7c7190c 930 * If the IP address was already pending in the cache, a new ARP request
GordonSin 0:0ed2a7c7190c 931 * is sent for the given address. The packet is queued on this entry.
GordonSin 0:0ed2a7c7190c 932 *
GordonSin 0:0ed2a7c7190c 933 * If the IP address was already stable in the cache, and a packet is
GordonSin 0:0ed2a7c7190c 934 * given, it is directly sent and no ARP request is sent out.
GordonSin 0:0ed2a7c7190c 935 *
GordonSin 0:0ed2a7c7190c 936 * If the IP address was already stable in the cache, and no packet is
GordonSin 0:0ed2a7c7190c 937 * given, an ARP request is sent out.
GordonSin 0:0ed2a7c7190c 938 *
GordonSin 0:0ed2a7c7190c 939 * @param netif The lwIP network interface on which ipaddr
GordonSin 0:0ed2a7c7190c 940 * must be queried for.
GordonSin 0:0ed2a7c7190c 941 * @param ipaddr The IP address to be resolved.
GordonSin 0:0ed2a7c7190c 942 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
GordonSin 0:0ed2a7c7190c 943 * q is not freed by this function.
GordonSin 0:0ed2a7c7190c 944 *
GordonSin 0:0ed2a7c7190c 945 * @note q must only be ONE packet, not a packet queue!
GordonSin 0:0ed2a7c7190c 946 *
GordonSin 0:0ed2a7c7190c 947 * @return
GordonSin 0:0ed2a7c7190c 948 * - ERR_BUF Could not make room for Ethernet header.
GordonSin 0:0ed2a7c7190c 949 * - ERR_MEM Hardware address unknown, and no more ARP entries available
GordonSin 0:0ed2a7c7190c 950 * to query for address or queue the packet.
GordonSin 0:0ed2a7c7190c 951 * - ERR_MEM Could not queue packet due to memory shortage.
GordonSin 0:0ed2a7c7190c 952 * - ERR_RTE No route to destination (no gateway to external networks).
GordonSin 0:0ed2a7c7190c 953 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
GordonSin 0:0ed2a7c7190c 954 *
GordonSin 0:0ed2a7c7190c 955 */
GordonSin 0:0ed2a7c7190c 956 err_t
GordonSin 0:0ed2a7c7190c 957 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
GordonSin 0:0ed2a7c7190c 958 {
GordonSin 0:0ed2a7c7190c 959 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
GordonSin 0:0ed2a7c7190c 960 err_t result = ERR_MEM;
GordonSin 0:0ed2a7c7190c 961 s8_t i; /* ARP entry index */
GordonSin 0:0ed2a7c7190c 962
GordonSin 0:0ed2a7c7190c 963 /* non-unicast address? */
GordonSin 0:0ed2a7c7190c 964 if (ip_addr_isbroadcast(ipaddr, netif) ||
GordonSin 0:0ed2a7c7190c 965 ip_addr_ismulticast(ipaddr) ||
GordonSin 0:0ed2a7c7190c 966 ip_addr_isany(ipaddr)) {
GordonSin 0:0ed2a7c7190c 967 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
GordonSin 0:0ed2a7c7190c 968 return ERR_ARG;
GordonSin 0:0ed2a7c7190c 969 }
GordonSin 0:0ed2a7c7190c 970
GordonSin 0:0ed2a7c7190c 971 /* find entry in ARP cache, ask to create entry if queueing packet */
GordonSin 0:0ed2a7c7190c 972 i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
GordonSin 0:0ed2a7c7190c 973
GordonSin 0:0ed2a7c7190c 974 /* could not find or create entry? */
GordonSin 0:0ed2a7c7190c 975 if (i < 0) {
GordonSin 0:0ed2a7c7190c 976 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
GordonSin 0:0ed2a7c7190c 977 if (q) {
GordonSin 0:0ed2a7c7190c 978 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
GordonSin 0:0ed2a7c7190c 979 ETHARP_STATS_INC(etharp.memerr);
GordonSin 0:0ed2a7c7190c 980 }
GordonSin 0:0ed2a7c7190c 981 return (err_t)i;
GordonSin 0:0ed2a7c7190c 982 }
GordonSin 0:0ed2a7c7190c 983
GordonSin 0:0ed2a7c7190c 984 /* mark a fresh entry as pending (we just sent a request) */
GordonSin 0:0ed2a7c7190c 985 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
GordonSin 0:0ed2a7c7190c 986 arp_table[i].state = ETHARP_STATE_PENDING;
GordonSin 0:0ed2a7c7190c 987 }
GordonSin 0:0ed2a7c7190c 988
GordonSin 0:0ed2a7c7190c 989 /* { i is either a STABLE or (new or existing) PENDING entry } */
GordonSin 0:0ed2a7c7190c 990 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
GordonSin 0:0ed2a7c7190c 991 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
GordonSin 0:0ed2a7c7190c 992 (arp_table[i].state == ETHARP_STATE_STABLE)));
GordonSin 0:0ed2a7c7190c 993
GordonSin 0:0ed2a7c7190c 994 /* do we have a pending entry? or an implicit query request? */
GordonSin 0:0ed2a7c7190c 995 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
GordonSin 0:0ed2a7c7190c 996 /* try to resolve it; send out ARP request */
GordonSin 0:0ed2a7c7190c 997 result = etharp_request(netif, ipaddr);
GordonSin 0:0ed2a7c7190c 998 if (result != ERR_OK) {
GordonSin 0:0ed2a7c7190c 999 /* ARP request couldn't be sent */
GordonSin 0:0ed2a7c7190c 1000 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
GordonSin 0:0ed2a7c7190c 1001 since this failure could be temporary, and the next packet calling
GordonSin 0:0ed2a7c7190c 1002 etharp_query again could lead to sending the queued packets. */
GordonSin 0:0ed2a7c7190c 1003 }
GordonSin 0:0ed2a7c7190c 1004 if (q == NULL) {
GordonSin 0:0ed2a7c7190c 1005 return result;
GordonSin 0:0ed2a7c7190c 1006 }
GordonSin 0:0ed2a7c7190c 1007 }
GordonSin 0:0ed2a7c7190c 1008
GordonSin 0:0ed2a7c7190c 1009 /* packet given? */
GordonSin 0:0ed2a7c7190c 1010 LWIP_ASSERT("q != NULL", q != NULL);
GordonSin 0:0ed2a7c7190c 1011 /* stable entry? */
GordonSin 0:0ed2a7c7190c 1012 if (arp_table[i].state == ETHARP_STATE_STABLE) {
GordonSin 0:0ed2a7c7190c 1013 /* we have a valid IP->Ethernet address mapping */
GordonSin 0:0ed2a7c7190c 1014 ETHARP_SET_HINT(netif, i);
GordonSin 0:0ed2a7c7190c 1015 /* send the packet */
GordonSin 0:0ed2a7c7190c 1016 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
GordonSin 0:0ed2a7c7190c 1017 /* pending entry? (either just created or already pending */
GordonSin 0:0ed2a7c7190c 1018 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
GordonSin 0:0ed2a7c7190c 1019 /* entry is still pending, queue the given packet 'q' */
GordonSin 0:0ed2a7c7190c 1020 struct pbuf *p;
GordonSin 0:0ed2a7c7190c 1021 int copy_needed = 0;
GordonSin 0:0ed2a7c7190c 1022 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
GordonSin 0:0ed2a7c7190c 1023 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
GordonSin 0:0ed2a7c7190c 1024 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
GordonSin 0:0ed2a7c7190c 1025 p = q;
GordonSin 0:0ed2a7c7190c 1026 while (p) {
GordonSin 0:0ed2a7c7190c 1027 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
GordonSin 0:0ed2a7c7190c 1028 if(p->type != PBUF_ROM) {
GordonSin 0:0ed2a7c7190c 1029 copy_needed = 1;
GordonSin 0:0ed2a7c7190c 1030 break;
GordonSin 0:0ed2a7c7190c 1031 }
GordonSin 0:0ed2a7c7190c 1032 p = p->next;
GordonSin 0:0ed2a7c7190c 1033 }
GordonSin 0:0ed2a7c7190c 1034 if(copy_needed) {
GordonSin 0:0ed2a7c7190c 1035 /* copy the whole packet into new pbufs */
GordonSin 0:0ed2a7c7190c 1036 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
GordonSin 0:0ed2a7c7190c 1037 if(p != NULL) {
GordonSin 0:0ed2a7c7190c 1038 if (pbuf_copy(p, q) != ERR_OK) {
GordonSin 0:0ed2a7c7190c 1039 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 1040 p = NULL;
GordonSin 0:0ed2a7c7190c 1041 }
GordonSin 0:0ed2a7c7190c 1042 }
GordonSin 0:0ed2a7c7190c 1043 } else {
GordonSin 0:0ed2a7c7190c 1044 /* referencing the old pbuf is enough */
GordonSin 0:0ed2a7c7190c 1045 p = q;
GordonSin 0:0ed2a7c7190c 1046 pbuf_ref(p);
GordonSin 0:0ed2a7c7190c 1047 }
GordonSin 0:0ed2a7c7190c 1048 /* packet could be taken over? */
GordonSin 0:0ed2a7c7190c 1049 if (p != NULL) {
GordonSin 0:0ed2a7c7190c 1050 /* queue packet ... */
GordonSin 0:0ed2a7c7190c 1051 #if ARP_QUEUEING
GordonSin 0:0ed2a7c7190c 1052 struct etharp_q_entry *new_entry;
GordonSin 0:0ed2a7c7190c 1053 /* allocate a new arp queue entry */
GordonSin 0:0ed2a7c7190c 1054 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
GordonSin 0:0ed2a7c7190c 1055 if (new_entry != NULL) {
GordonSin 0:0ed2a7c7190c 1056 new_entry->next = 0;
GordonSin 0:0ed2a7c7190c 1057 new_entry->p = p;
GordonSin 0:0ed2a7c7190c 1058 if(arp_table[i].q != NULL) {
GordonSin 0:0ed2a7c7190c 1059 /* queue was already existent, append the new entry to the end */
GordonSin 0:0ed2a7c7190c 1060 struct etharp_q_entry *r;
GordonSin 0:0ed2a7c7190c 1061 r = arp_table[i].q;
GordonSin 0:0ed2a7c7190c 1062 while (r->next != NULL) {
GordonSin 0:0ed2a7c7190c 1063 r = r->next;
GordonSin 0:0ed2a7c7190c 1064 }
GordonSin 0:0ed2a7c7190c 1065 r->next = new_entry;
GordonSin 0:0ed2a7c7190c 1066 } else {
GordonSin 0:0ed2a7c7190c 1067 /* queue did not exist, first item in queue */
GordonSin 0:0ed2a7c7190c 1068 arp_table[i].q = new_entry;
GordonSin 0:0ed2a7c7190c 1069 }
GordonSin 0:0ed2a7c7190c 1070 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
GordonSin 0:0ed2a7c7190c 1071 result = ERR_OK;
GordonSin 0:0ed2a7c7190c 1072 } else {
GordonSin 0:0ed2a7c7190c 1073 /* the pool MEMP_ARP_QUEUE is empty */
GordonSin 0:0ed2a7c7190c 1074 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 1075 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));
GordonSin 0:0ed2a7c7190c 1076 result = ERR_MEM;
GordonSin 0:0ed2a7c7190c 1077 }
GordonSin 0:0ed2a7c7190c 1078 #else /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 1079 /* always queue one packet per ARP request only, freeing a previously queued packet */
GordonSin 0:0ed2a7c7190c 1080 if (arp_table[i].q != NULL) {
GordonSin 0:0ed2a7c7190c 1081 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));
GordonSin 0:0ed2a7c7190c 1082 pbuf_free(arp_table[i].q);
GordonSin 0:0ed2a7c7190c 1083 }
GordonSin 0:0ed2a7c7190c 1084 arp_table[i].q = p;
GordonSin 0:0ed2a7c7190c 1085 result = ERR_OK;
GordonSin 0:0ed2a7c7190c 1086 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
GordonSin 0:0ed2a7c7190c 1087 #endif /* ARP_QUEUEING */
GordonSin 0:0ed2a7c7190c 1088 } else {
GordonSin 0:0ed2a7c7190c 1089 ETHARP_STATS_INC(etharp.memerr);
GordonSin 0:0ed2a7c7190c 1090 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));
GordonSin 0:0ed2a7c7190c 1091 result = ERR_MEM;
GordonSin 0:0ed2a7c7190c 1092 }
GordonSin 0:0ed2a7c7190c 1093 }
GordonSin 0:0ed2a7c7190c 1094 return result;
GordonSin 0:0ed2a7c7190c 1095 }
GordonSin 0:0ed2a7c7190c 1096
GordonSin 0:0ed2a7c7190c 1097 /**
GordonSin 0:0ed2a7c7190c 1098 * Send a raw ARP packet (opcode and all addresses can be modified)
GordonSin 0:0ed2a7c7190c 1099 *
GordonSin 0:0ed2a7c7190c 1100 * @param netif the lwip network interface on which to send the ARP packet
GordonSin 0:0ed2a7c7190c 1101 * @param ethsrc_addr the source MAC address for the ethernet header
GordonSin 0:0ed2a7c7190c 1102 * @param ethdst_addr the destination MAC address for the ethernet header
GordonSin 0:0ed2a7c7190c 1103 * @param hwsrc_addr the source MAC address for the ARP protocol header
GordonSin 0:0ed2a7c7190c 1104 * @param ipsrc_addr the source IP address for the ARP protocol header
GordonSin 0:0ed2a7c7190c 1105 * @param hwdst_addr the destination MAC address for the ARP protocol header
GordonSin 0:0ed2a7c7190c 1106 * @param ipdst_addr the destination IP address for the ARP protocol header
GordonSin 0:0ed2a7c7190c 1107 * @param opcode the type of the ARP packet
GordonSin 0:0ed2a7c7190c 1108 * @return ERR_OK if the ARP packet has been sent
GordonSin 0:0ed2a7c7190c 1109 * ERR_MEM if the ARP packet couldn't be allocated
GordonSin 0:0ed2a7c7190c 1110 * any other err_t on failure
GordonSin 0:0ed2a7c7190c 1111 */
GordonSin 0:0ed2a7c7190c 1112 #if !LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 1113 static
GordonSin 0:0ed2a7c7190c 1114 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 1115 err_t
GordonSin 0:0ed2a7c7190c 1116 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
GordonSin 0:0ed2a7c7190c 1117 const struct eth_addr *ethdst_addr,
GordonSin 0:0ed2a7c7190c 1118 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
GordonSin 0:0ed2a7c7190c 1119 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
GordonSin 0:0ed2a7c7190c 1120 const u16_t opcode)
GordonSin 0:0ed2a7c7190c 1121 {
GordonSin 0:0ed2a7c7190c 1122 struct pbuf *p;
GordonSin 0:0ed2a7c7190c 1123 err_t result = ERR_OK;
GordonSin 0:0ed2a7c7190c 1124 struct eth_hdr *ethhdr;
GordonSin 0:0ed2a7c7190c 1125 struct etharp_hdr *hdr;
GordonSin 0:0ed2a7c7190c 1126 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 1127 const u8_t * ethdst_hwaddr;
GordonSin 0:0ed2a7c7190c 1128 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 1129
GordonSin 0:0ed2a7c7190c 1130 /* allocate a pbuf for the outgoing ARP request packet */
GordonSin 0:0ed2a7c7190c 1131 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
GordonSin 0:0ed2a7c7190c 1132 /* could allocate a pbuf for an ARP request? */
GordonSin 0:0ed2a7c7190c 1133 if (p == NULL) {
GordonSin 0:0ed2a7c7190c 1134 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 1135 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
GordonSin 0:0ed2a7c7190c 1136 ETHARP_STATS_INC(etharp.memerr);
GordonSin 0:0ed2a7c7190c 1137 return ERR_MEM;
GordonSin 0:0ed2a7c7190c 1138 }
GordonSin 0:0ed2a7c7190c 1139 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
GordonSin 0:0ed2a7c7190c 1140 (p->len >= SIZEOF_ETHARP_PACKET));
GordonSin 0:0ed2a7c7190c 1141
GordonSin 0:0ed2a7c7190c 1142 ethhdr = (struct eth_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 1143 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
GordonSin 0:0ed2a7c7190c 1144 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
GordonSin 0:0ed2a7c7190c 1145 hdr->opcode = htons(opcode);
GordonSin 0:0ed2a7c7190c 1146
GordonSin 0:0ed2a7c7190c 1147 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
GordonSin 0:0ed2a7c7190c 1148 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
GordonSin 0:0ed2a7c7190c 1149 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 1150 /* If we are using Link-Local, all ARP packets that contain a Link-Local
GordonSin 0:0ed2a7c7190c 1151 * 'sender IP address' MUST be sent using link-layer broadcast instead of
GordonSin 0:0ed2a7c7190c 1152 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
GordonSin 0:0ed2a7c7190c 1153 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
GordonSin 0:0ed2a7c7190c 1154 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 1155 /* Write the ARP MAC-Addresses */
GordonSin 0:0ed2a7c7190c 1156 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
GordonSin 0:0ed2a7c7190c 1157 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
GordonSin 0:0ed2a7c7190c 1158 /* Write the Ethernet MAC-Addresses */
GordonSin 0:0ed2a7c7190c 1159 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 1160 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
GordonSin 0:0ed2a7c7190c 1161 #else /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 1162 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
GordonSin 0:0ed2a7c7190c 1163 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 1164 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
GordonSin 0:0ed2a7c7190c 1165 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
GordonSin 0:0ed2a7c7190c 1166 * structure packing. */
GordonSin 0:0ed2a7c7190c 1167 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
GordonSin 0:0ed2a7c7190c 1168 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
GordonSin 0:0ed2a7c7190c 1169
GordonSin 0:0ed2a7c7190c 1170 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
GordonSin 0:0ed2a7c7190c 1171 hdr->proto = PP_HTONS(ETHTYPE_IP);
GordonSin 0:0ed2a7c7190c 1172 /* set hwlen and protolen */
GordonSin 0:0ed2a7c7190c 1173 hdr->hwlen = ETHARP_HWADDR_LEN;
GordonSin 0:0ed2a7c7190c 1174 hdr->protolen = sizeof(ip_addr_t);
GordonSin 0:0ed2a7c7190c 1175
GordonSin 0:0ed2a7c7190c 1176 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
GordonSin 0:0ed2a7c7190c 1177 /* send ARP query */
GordonSin 0:0ed2a7c7190c 1178 result = netif->linkoutput(netif, p);
GordonSin 0:0ed2a7c7190c 1179 ETHARP_STATS_INC(etharp.xmit);
GordonSin 0:0ed2a7c7190c 1180 /* free ARP query packet */
GordonSin 0:0ed2a7c7190c 1181 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 1182 p = NULL;
GordonSin 0:0ed2a7c7190c 1183 /* could not allocate pbuf for ARP request */
GordonSin 0:0ed2a7c7190c 1184
GordonSin 0:0ed2a7c7190c 1185 return result;
GordonSin 0:0ed2a7c7190c 1186 }
GordonSin 0:0ed2a7c7190c 1187
GordonSin 0:0ed2a7c7190c 1188 /**
GordonSin 0:0ed2a7c7190c 1189 * Send an ARP request packet asking for ipaddr.
GordonSin 0:0ed2a7c7190c 1190 *
GordonSin 0:0ed2a7c7190c 1191 * @param netif the lwip network interface on which to send the request
GordonSin 0:0ed2a7c7190c 1192 * @param ipaddr the IP address for which to ask
GordonSin 0:0ed2a7c7190c 1193 * @return ERR_OK if the request has been sent
GordonSin 0:0ed2a7c7190c 1194 * ERR_MEM if the ARP packet couldn't be allocated
GordonSin 0:0ed2a7c7190c 1195 * any other err_t on failure
GordonSin 0:0ed2a7c7190c 1196 */
GordonSin 0:0ed2a7c7190c 1197 err_t
GordonSin 0:0ed2a7c7190c 1198 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
GordonSin 0:0ed2a7c7190c 1199 {
GordonSin 0:0ed2a7c7190c 1200 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
GordonSin 0:0ed2a7c7190c 1201 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
GordonSin 0:0ed2a7c7190c 1202 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
GordonSin 0:0ed2a7c7190c 1203 ipaddr, ARP_REQUEST);
GordonSin 0:0ed2a7c7190c 1204 }
GordonSin 0:0ed2a7c7190c 1205 #endif /* LWIP_ARP */
GordonSin 0:0ed2a7c7190c 1206
GordonSin 0:0ed2a7c7190c 1207 /**
GordonSin 0:0ed2a7c7190c 1208 * Process received ethernet frames. Using this function instead of directly
GordonSin 0:0ed2a7c7190c 1209 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
GordonSin 0:0ed2a7c7190c 1210 * the ARP cache is protected from concurrent access.
GordonSin 0:0ed2a7c7190c 1211 *
GordonSin 0:0ed2a7c7190c 1212 * @param p the recevied packet, p->payload pointing to the ethernet header
GordonSin 0:0ed2a7c7190c 1213 * @param netif the network interface on which the packet was received
GordonSin 0:0ed2a7c7190c 1214 */
GordonSin 0:0ed2a7c7190c 1215 err_t
GordonSin 0:0ed2a7c7190c 1216 ethernet_input(struct pbuf *p, struct netif *netif)
GordonSin 0:0ed2a7c7190c 1217 {
GordonSin 0:0ed2a7c7190c 1218 struct eth_hdr* ethhdr;
GordonSin 0:0ed2a7c7190c 1219 u16_t type;
GordonSin 0:0ed2a7c7190c 1220 s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
GordonSin 0:0ed2a7c7190c 1221
GordonSin 0:0ed2a7c7190c 1222 if (p->len <= SIZEOF_ETH_HDR) {
GordonSin 0:0ed2a7c7190c 1223 /* a packet with only an ethernet header (or less) is not valid for us */
GordonSin 0:0ed2a7c7190c 1224 ETHARP_STATS_INC(etharp.proterr);
GordonSin 0:0ed2a7c7190c 1225 ETHARP_STATS_INC(etharp.drop);
GordonSin 0:0ed2a7c7190c 1226 goto free_and_return;
GordonSin 0:0ed2a7c7190c 1227 }
GordonSin 0:0ed2a7c7190c 1228
GordonSin 0:0ed2a7c7190c 1229 /* points to packet payload, which starts with an Ethernet header */
GordonSin 0:0ed2a7c7190c 1230 ethhdr = (struct eth_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 1231 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 1232 ("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",
GordonSin 0:0ed2a7c7190c 1233 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
GordonSin 0:0ed2a7c7190c 1234 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
GordonSin 0:0ed2a7c7190c 1235 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
GordonSin 0:0ed2a7c7190c 1236 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
GordonSin 0:0ed2a7c7190c 1237 (unsigned)htons(ethhdr->type)));
GordonSin 0:0ed2a7c7190c 1238
GordonSin 0:0ed2a7c7190c 1239 type = ethhdr->type;
GordonSin 0:0ed2a7c7190c 1240 #if ETHARP_SUPPORT_VLAN
GordonSin 0:0ed2a7c7190c 1241 if (type == PP_HTONS(ETHTYPE_VLAN)) {
GordonSin 0:0ed2a7c7190c 1242 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
GordonSin 0:0ed2a7c7190c 1243 if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
GordonSin 0:0ed2a7c7190c 1244 /* a packet with only an ethernet/vlan header (or less) is not valid for us */
GordonSin 0:0ed2a7c7190c 1245 ETHARP_STATS_INC(etharp.proterr);
GordonSin 0:0ed2a7c7190c 1246 ETHARP_STATS_INC(etharp.drop);
GordonSin 0:0ed2a7c7190c 1247 goto free_and_return;
GordonSin 0:0ed2a7c7190c 1248 }
GordonSin 0:0ed2a7c7190c 1249 #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
GordonSin 0:0ed2a7c7190c 1250 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
GordonSin 0:0ed2a7c7190c 1251 /* silently ignore this packet: not for our VLAN */
GordonSin 0:0ed2a7c7190c 1252 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 1253 return ERR_OK;
GordonSin 0:0ed2a7c7190c 1254 }
GordonSin 0:0ed2a7c7190c 1255 #endif /* ETHARP_VLAN_CHECK */
GordonSin 0:0ed2a7c7190c 1256 type = vlan->tpid;
GordonSin 0:0ed2a7c7190c 1257 ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
GordonSin 0:0ed2a7c7190c 1258 }
GordonSin 0:0ed2a7c7190c 1259 #endif /* ETHARP_SUPPORT_VLAN */
GordonSin 0:0ed2a7c7190c 1260
GordonSin 0:0ed2a7c7190c 1261 #if LWIP_ARP_FILTER_NETIF
GordonSin 0:0ed2a7c7190c 1262 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
GordonSin 0:0ed2a7c7190c 1263 #endif /* LWIP_ARP_FILTER_NETIF*/
GordonSin 0:0ed2a7c7190c 1264
GordonSin 0:0ed2a7c7190c 1265 switch (type) {
GordonSin 0:0ed2a7c7190c 1266 #if LWIP_ARP
GordonSin 0:0ed2a7c7190c 1267 /* IP packet? */
GordonSin 0:0ed2a7c7190c 1268 case PP_HTONS(ETHTYPE_IP):
GordonSin 0:0ed2a7c7190c 1269 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
GordonSin 0:0ed2a7c7190c 1270 goto free_and_return;
GordonSin 0:0ed2a7c7190c 1271 }
GordonSin 0:0ed2a7c7190c 1272 #if ETHARP_TRUST_IP_MAC
GordonSin 0:0ed2a7c7190c 1273 /* update ARP table */
GordonSin 0:0ed2a7c7190c 1274 etharp_ip_input(netif, p);
GordonSin 0:0ed2a7c7190c 1275 #endif /* ETHARP_TRUST_IP_MAC */
GordonSin 0:0ed2a7c7190c 1276 /* skip Ethernet header */
GordonSin 0:0ed2a7c7190c 1277 if(pbuf_header(p, -ip_hdr_offset)) {
GordonSin 0:0ed2a7c7190c 1278 LWIP_ASSERT("Can't move over header in packet", 0);
GordonSin 0:0ed2a7c7190c 1279 goto free_and_return;
GordonSin 0:0ed2a7c7190c 1280 } else {
GordonSin 0:0ed2a7c7190c 1281 /* pass to IP layer */
GordonSin 0:0ed2a7c7190c 1282 ip_input(p, netif);
GordonSin 0:0ed2a7c7190c 1283 }
GordonSin 0:0ed2a7c7190c 1284 break;
GordonSin 0:0ed2a7c7190c 1285
GordonSin 0:0ed2a7c7190c 1286 case PP_HTONS(ETHTYPE_ARP):
GordonSin 0:0ed2a7c7190c 1287 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
GordonSin 0:0ed2a7c7190c 1288 goto free_and_return;
GordonSin 0:0ed2a7c7190c 1289 }
GordonSin 0:0ed2a7c7190c 1290 /* pass p to ARP module */
GordonSin 0:0ed2a7c7190c 1291 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
GordonSin 0:0ed2a7c7190c 1292 break;
GordonSin 0:0ed2a7c7190c 1293 #endif /* LWIP_ARP */
GordonSin 0:0ed2a7c7190c 1294 #if PPPOE_SUPPORT
GordonSin 0:0ed2a7c7190c 1295 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
GordonSin 0:0ed2a7c7190c 1296 pppoe_disc_input(netif, p);
GordonSin 0:0ed2a7c7190c 1297 break;
GordonSin 0:0ed2a7c7190c 1298
GordonSin 0:0ed2a7c7190c 1299 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
GordonSin 0:0ed2a7c7190c 1300 pppoe_data_input(netif, p);
GordonSin 0:0ed2a7c7190c 1301 break;
GordonSin 0:0ed2a7c7190c 1302 #endif /* PPPOE_SUPPORT */
GordonSin 0:0ed2a7c7190c 1303
GordonSin 0:0ed2a7c7190c 1304 default:
GordonSin 0:0ed2a7c7190c 1305 ETHARP_STATS_INC(etharp.proterr);
GordonSin 0:0ed2a7c7190c 1306 ETHARP_STATS_INC(etharp.drop);
GordonSin 0:0ed2a7c7190c 1307 goto free_and_return;
GordonSin 0:0ed2a7c7190c 1308 }
GordonSin 0:0ed2a7c7190c 1309
GordonSin 0:0ed2a7c7190c 1310 /* This means the pbuf is freed or consumed,
GordonSin 0:0ed2a7c7190c 1311 so the caller doesn't have to free it again */
GordonSin 0:0ed2a7c7190c 1312 return ERR_OK;
GordonSin 0:0ed2a7c7190c 1313
GordonSin 0:0ed2a7c7190c 1314 free_and_return:
GordonSin 0:0ed2a7c7190c 1315 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 1316 return ERR_OK;
GordonSin 0:0ed2a7c7190c 1317 }
GordonSin 0:0ed2a7c7190c 1318 #endif /* LWIP_ARP || LWIP_ETHERNET */