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Dependencies:   mbed

NetServices/lwip/netif/etharp.c@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /**
Michael J. Spencer 1:f5ac63519541 2 * @file
Michael J. Spencer 1:f5ac63519541 3 * Address Resolution Protocol module for IP over Ethernet
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 * Functionally, ARP is divided into two parts. The first maps an IP address
Michael J. Spencer 1:f5ac63519541 6 * to a physical address when sending a packet, and the second part answers
Michael J. Spencer 1:f5ac63519541 7 * requests from other machines for our physical address.
Michael J. Spencer 1:f5ac63519541 8 *
Michael J. Spencer 1:f5ac63519541 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
Michael J. Spencer 1:f5ac63519541 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
Michael J. Spencer 1:f5ac63519541 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
Michael J. Spencer 1:f5ac63519541 12 */
Michael J. Spencer 1:f5ac63519541 13
Michael J. Spencer 1:f5ac63519541 14 /*
Michael J. Spencer 1:f5ac63519541 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
Michael J. Spencer 1:f5ac63519541 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
Michael J. Spencer 1:f5ac63519541 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
Michael J. Spencer 1:f5ac63519541 18 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 19 *
Michael J. Spencer 1:f5ac63519541 20 * Redistribution and use in source and binary forms, with or without modification,
Michael J. Spencer 1:f5ac63519541 21 * are permitted provided that the following conditions are met:
Michael J. Spencer 1:f5ac63519541 22 *
Michael J. Spencer 1:f5ac63519541 23 * 1. Redistributions of source code must retain the above copyright notice,
Michael J. Spencer 1:f5ac63519541 24 * this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
Michael J. Spencer 1:f5ac63519541 26 * this list of conditions and the following disclaimer in the documentation
Michael J. Spencer 1:f5ac63519541 27 * and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 28 * 3. The name of the author may not be used to endorse or promote products
Michael J. Spencer 1:f5ac63519541 29 * derived from this software without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 30 *
Michael J. Spencer 1:f5ac63519541 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Michael J. Spencer 1:f5ac63519541 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Michael J. Spencer 1:f5ac63519541 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Michael J. Spencer 1:f5ac63519541 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Michael J. Spencer 1:f5ac63519541 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Michael J. Spencer 1:f5ac63519541 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Michael J. Spencer 1:f5ac63519541 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Michael J. Spencer 1:f5ac63519541 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Michael J. Spencer 1:f5ac63519541 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Michael J. Spencer 1:f5ac63519541 40 * OF SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 41 *
Michael J. Spencer 1:f5ac63519541 42 * This file is part of the lwIP TCP/IP stack.
Michael J. Spencer 1:f5ac63519541 43 *
Michael J. Spencer 1:f5ac63519541 44 */
Michael J. Spencer 1:f5ac63519541 45
Michael J. Spencer 1:f5ac63519541 46 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 47
Michael J. Spencer 1:f5ac63519541 48 #if LWIP_ARP || LWIP_ETHERNET
Michael J. Spencer 1:f5ac63519541 49
Michael J. Spencer 1:f5ac63519541 50 #include "lwip/ip_addr.h"
Michael J. Spencer 1:f5ac63519541 51 #include "lwip/def.h"
Michael J. Spencer 1:f5ac63519541 52 #include "lwip/ip.h"
Michael J. Spencer 1:f5ac63519541 53 #include "lwip/stats.h"
Michael J. Spencer 1:f5ac63519541 54 #include "lwip/snmp.h"
Michael J. Spencer 1:f5ac63519541 55 #include "lwip/dhcp.h"
Michael J. Spencer 1:f5ac63519541 56 #include "lwip/autoip.h"
Michael J. Spencer 1:f5ac63519541 57 #include "netif/etharp.h"
Michael J. Spencer 1:f5ac63519541 58
Michael J. Spencer 1:f5ac63519541 59 #if PPPOE_SUPPORT
Michael J. Spencer 1:f5ac63519541 60 #include "netif/ppp_oe.h"
Michael J. Spencer 1:f5ac63519541 61 #endif /* PPPOE_SUPPORT */
Michael J. Spencer 1:f5ac63519541 62
Michael J. Spencer 1:f5ac63519541 63 #include <string.h>
Michael J. Spencer 1:f5ac63519541 64
Michael J. Spencer 1:f5ac63519541 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
Michael J. Spencer 1:f5ac63519541 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
Michael J. Spencer 1:f5ac63519541 67
Michael J. Spencer 1:f5ac63519541 68 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
Michael J. Spencer 1:f5ac63519541 69
Michael J. Spencer 1:f5ac63519541 70 /** the time an ARP entry stays valid after its last update,
Michael J. Spencer 1:f5ac63519541 71 * for ARP_TMR_INTERVAL = 5000, this is
Michael J. Spencer 1:f5ac63519541 72 * (240 * 5) seconds = 20 minutes.
Michael J. Spencer 1:f5ac63519541 73 */
Michael J. Spencer 1:f5ac63519541 74 #define ARP_MAXAGE 240
Michael J. Spencer 1:f5ac63519541 75 /** the time an ARP entry stays pending after first request,
Michael J. Spencer 1:f5ac63519541 76 * for ARP_TMR_INTERVAL = 5000, this is
Michael J. Spencer 1:f5ac63519541 77 * (2 * 5) seconds = 10 seconds.
Michael J. Spencer 1:f5ac63519541 78 *
Michael J. Spencer 1:f5ac63519541 79 * @internal Keep this number at least 2, otherwise it might
Michael J. Spencer 1:f5ac63519541 80 * run out instantly if the timeout occurs directly after a request.
Michael J. Spencer 1:f5ac63519541 81 */
Michael J. Spencer 1:f5ac63519541 82 #define ARP_MAXPENDING 2
Michael J. Spencer 1:f5ac63519541 83
Michael J. Spencer 1:f5ac63519541 84 #define HWTYPE_ETHERNET 1
Michael J. Spencer 1:f5ac63519541 85
Michael J. Spencer 1:f5ac63519541 86 enum etharp_state {
Michael J. Spencer 1:f5ac63519541 87 ETHARP_STATE_EMPTY = 0,
Michael J. Spencer 1:f5ac63519541 88 ETHARP_STATE_PENDING,
Michael J. Spencer 1:f5ac63519541 89 ETHARP_STATE_STABLE
Michael J. Spencer 1:f5ac63519541 90 };
Michael J. Spencer 1:f5ac63519541 91
Michael J. Spencer 1:f5ac63519541 92 struct etharp_entry {
Michael J. Spencer 1:f5ac63519541 93 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 94 /** Pointer to queue of pending outgoing packets on this ARP entry. */
Michael J. Spencer 1:f5ac63519541 95 struct etharp_q_entry *q;
Michael J. Spencer 1:f5ac63519541 96 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 97 ip_addr_t ipaddr;
Michael J. Spencer 1:f5ac63519541 98 struct eth_addr ethaddr;
Michael J. Spencer 1:f5ac63519541 99 #if LWIP_SNMP
Michael J. Spencer 1:f5ac63519541 100 struct netif *netif;
Michael J. Spencer 1:f5ac63519541 101 #endif /* LWIP_SNMP */
Michael J. Spencer 1:f5ac63519541 102 u8_t state;
Michael J. Spencer 1:f5ac63519541 103 u8_t ctime;
Michael J. Spencer 1:f5ac63519541 104 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 105 u8_t static_entry;
Michael J. Spencer 1:f5ac63519541 106 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 107 };
Michael J. Spencer 1:f5ac63519541 108
Michael J. Spencer 1:f5ac63519541 109 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
Michael J. Spencer 1:f5ac63519541 110
Michael J. Spencer 1:f5ac63519541 111 #if !LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 112 static u8_t etharp_cached_entry;
Michael J. Spencer 1:f5ac63519541 113 #endif /* !LWIP_NETIF_HWADDRHINT */
Michael J. Spencer 1:f5ac63519541 114
Michael J. Spencer 1:f5ac63519541 115 /** Try hard to create a new entry - we want the IP address to appear in
Michael J. Spencer 1:f5ac63519541 116 the cache (even if this means removing an active entry or so). */
Michael J. Spencer 1:f5ac63519541 117 #define ETHARP_FLAG_TRY_HARD 1
Michael J. Spencer 1:f5ac63519541 118 #define ETHARP_FLAG_FIND_ONLY 2
Michael J. Spencer 1:f5ac63519541 119 #define ETHARP_FLAG_STATIC_ENTRY 4
Michael J. Spencer 1:f5ac63519541 120
Michael J. Spencer 1:f5ac63519541 121 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 122 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
Michael J. Spencer 1:f5ac63519541 123 *((netif)->addr_hint) = (hint);
Michael J. Spencer 1:f5ac63519541 124 #else /* LWIP_NETIF_HWADDRHINT */
Michael J. Spencer 1:f5ac63519541 125 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
Michael J. Spencer 1:f5ac63519541 126 #endif /* LWIP_NETIF_HWADDRHINT */
Michael J. Spencer 1:f5ac63519541 127
Michael J. Spencer 1:f5ac63519541 128 static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags);
Michael J. Spencer 1:f5ac63519541 129
Michael J. Spencer 1:f5ac63519541 130
Michael J. Spencer 1:f5ac63519541 131 /* Some checks, instead of etharp_init(): */
Michael J. Spencer 1:f5ac63519541 132 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
Michael J. Spencer 1:f5ac63519541 133 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
Michael J. Spencer 1:f5ac63519541 134 #endif
Michael J. Spencer 1:f5ac63519541 135
Michael J. Spencer 1:f5ac63519541 136
Michael J. Spencer 1:f5ac63519541 137 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 138 /**
Michael J. Spencer 1:f5ac63519541 139 * Free a complete queue of etharp entries
Michael J. Spencer 1:f5ac63519541 140 *
Michael J. Spencer 1:f5ac63519541 141 * @param q a qeueue of etharp_q_entry's to free
Michael J. Spencer 1:f5ac63519541 142 */
Michael J. Spencer 1:f5ac63519541 143 static void
Michael J. Spencer 1:f5ac63519541 144 free_etharp_q(struct etharp_q_entry *q)
Michael J. Spencer 1:f5ac63519541 145 {
Michael J. Spencer 1:f5ac63519541 146 struct etharp_q_entry *r;
Michael J. Spencer 1:f5ac63519541 147 LWIP_ASSERT("q != NULL", q != NULL);
Michael J. Spencer 1:f5ac63519541 148 LWIP_ASSERT("q->p != NULL", q->p != NULL);
Michael J. Spencer 1:f5ac63519541 149 while (q) {
Michael J. Spencer 1:f5ac63519541 150 r = q;
Michael J. Spencer 1:f5ac63519541 151 q = q->next;
Michael J. Spencer 1:f5ac63519541 152 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
Michael J. Spencer 1:f5ac63519541 153 pbuf_free(r->p);
Michael J. Spencer 1:f5ac63519541 154 memp_free(MEMP_ARP_QUEUE, r);
Michael J. Spencer 1:f5ac63519541 155 }
Michael J. Spencer 1:f5ac63519541 156 }
Michael J. Spencer 1:f5ac63519541 157 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 158
Michael J. Spencer 1:f5ac63519541 159 /** Clean up ARP table entries */
Michael J. Spencer 1:f5ac63519541 160 static void
Michael J. Spencer 1:f5ac63519541 161 free_entry(int i)
Michael J. Spencer 1:f5ac63519541 162 {
Michael J. Spencer 1:f5ac63519541 163 /* remove from SNMP ARP index tree */
Michael J. Spencer 1:f5ac63519541 164 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
Michael J. Spencer 1:f5ac63519541 165 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 166 /* and empty packet queue */
Michael J. Spencer 1:f5ac63519541 167 if (arp_table[i].q != NULL) {
Michael J. Spencer 1:f5ac63519541 168 /* remove all queued packets */
Michael J. Spencer 1:f5ac63519541 169 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
Michael J. Spencer 1:f5ac63519541 170 free_etharp_q(arp_table[i].q);
Michael J. Spencer 1:f5ac63519541 171 arp_table[i].q = NULL;
Michael J. Spencer 1:f5ac63519541 172 }
Michael J. Spencer 1:f5ac63519541 173 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 174 /* recycle entry for re-use */
Michael J. Spencer 1:f5ac63519541 175 arp_table[i].state = ETHARP_STATE_EMPTY;
Michael J. Spencer 1:f5ac63519541 176 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 177 arp_table[i].static_entry = 0;
Michael J. Spencer 1:f5ac63519541 178 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 179 #ifdef LWIP_DEBUG
Michael J. Spencer 1:f5ac63519541 180 /* for debugging, clean out the complete entry */
Michael J. Spencer 1:f5ac63519541 181 arp_table[i].ctime = 0;
Michael J. Spencer 1:f5ac63519541 182 #if LWIP_SNMP
Michael J. Spencer 1:f5ac63519541 183 arp_table[i].netif = NULL;
Michael J. Spencer 1:f5ac63519541 184 #endif /* LWIP_SNMP */
Michael J. Spencer 1:f5ac63519541 185 ip_addr_set_zero(&arp_table[i].ipaddr);
Michael J. Spencer 1:f5ac63519541 186 arp_table[i].ethaddr = ethzero;
Michael J. Spencer 1:f5ac63519541 187 #endif /* LWIP_DEBUG */
Michael J. Spencer 1:f5ac63519541 188 }
Michael J. Spencer 1:f5ac63519541 189
Michael J. Spencer 1:f5ac63519541 190 /**
Michael J. Spencer 1:f5ac63519541 191 * Clears expired entries in the ARP table.
Michael J. Spencer 1:f5ac63519541 192 *
Michael J. Spencer 1:f5ac63519541 193 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
Michael J. Spencer 1:f5ac63519541 194 * in order to expire entries in the ARP table.
Michael J. Spencer 1:f5ac63519541 195 */
Michael J. Spencer 1:f5ac63519541 196 void
Michael J. Spencer 1:f5ac63519541 197 etharp_tmr(void)
Michael J. Spencer 1:f5ac63519541 198 {
Michael J. Spencer 1:f5ac63519541 199 u8_t i;
Michael J. Spencer 1:f5ac63519541 200
Michael J. Spencer 1:f5ac63519541 201 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
Michael J. Spencer 1:f5ac63519541 202 /* remove expired entries from the ARP table */
Michael J. Spencer 1:f5ac63519541 203 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
Michael J. Spencer 1:f5ac63519541 204 u8_t state = arp_table[i].state;
Michael J. Spencer 1:f5ac63519541 205 if (state != ETHARP_STATE_EMPTY
Michael J. Spencer 1:f5ac63519541 206 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 207 && (arp_table[i].static_entry == 0)
Michael J. Spencer 1:f5ac63519541 208 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 209 ) {
Michael J. Spencer 1:f5ac63519541 210 arp_table[i].ctime++;
Michael J. Spencer 1:f5ac63519541 211 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
Michael J. Spencer 1:f5ac63519541 212 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
Michael J. Spencer 1:f5ac63519541 213 (arp_table[i].ctime >= ARP_MAXPENDING))) {
Michael J. Spencer 1:f5ac63519541 214 /* pending or stable entry has become old! */
Michael J. Spencer 1:f5ac63519541 215 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
Michael J. Spencer 1:f5ac63519541 216 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
Michael J. Spencer 1:f5ac63519541 217 /* clean up entries that have just been expired */
Michael J. Spencer 1:f5ac63519541 218 free_entry(i);
Michael J. Spencer 1:f5ac63519541 219 }
Michael J. Spencer 1:f5ac63519541 220 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 221 /* still pending entry? (not expired) */
Michael J. Spencer 1:f5ac63519541 222 if (arp_table[i].state == ETHARP_STATE_PENDING) {
Michael J. Spencer 1:f5ac63519541 223 /* resend an ARP query here? */
Michael J. Spencer 1:f5ac63519541 224 }
Michael J. Spencer 1:f5ac63519541 225 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 226 }
Michael J. Spencer 1:f5ac63519541 227 }
Michael J. Spencer 1:f5ac63519541 228 }
Michael J. Spencer 1:f5ac63519541 229
Michael J. Spencer 1:f5ac63519541 230 /**
Michael J. Spencer 1:f5ac63519541 231 * Search the ARP table for a matching or new entry.
Michael J. Spencer 1:f5ac63519541 232 *
Michael J. Spencer 1:f5ac63519541 233 * If an IP address is given, return a pending or stable ARP entry that matches
Michael J. Spencer 1:f5ac63519541 234 * the address. If no match is found, create a new entry with this address set,
Michael J. Spencer 1:f5ac63519541 235 * but in state ETHARP_EMPTY. The caller must check and possibly change the
Michael J. Spencer 1:f5ac63519541 236 * state of the returned entry.
Michael J. Spencer 1:f5ac63519541 237 *
Michael J. Spencer 1:f5ac63519541 238 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
Michael J. Spencer 1:f5ac63519541 239 *
Michael J. Spencer 1:f5ac63519541 240 * In all cases, attempt to create new entries from an empty entry. If no
Michael J. Spencer 1:f5ac63519541 241 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
Michael J. Spencer 1:f5ac63519541 242 * old entries. Heuristic choose the least important entry for recycling.
Michael J. Spencer 1:f5ac63519541 243 *
Michael J. Spencer 1:f5ac63519541 244 * @param ipaddr IP address to find in ARP cache, or to add if not found.
Michael J. Spencer 1:f5ac63519541 245 * @param flags @see definition of ETHARP_FLAG_*
Michael J. Spencer 1:f5ac63519541 246 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
Michael J. Spencer 1:f5ac63519541 247 *
Michael J. Spencer 1:f5ac63519541 248 * @return The ARP entry index that matched or is created, ERR_MEM if no
Michael J. Spencer 1:f5ac63519541 249 * entry is found or could be recycled.
Michael J. Spencer 1:f5ac63519541 250 */
Michael J. Spencer 1:f5ac63519541 251 static s8_t
Michael J. Spencer 1:f5ac63519541 252 find_entry(ip_addr_t *ipaddr, u8_t flags)
Michael J. Spencer 1:f5ac63519541 253 {
Michael J. Spencer 1:f5ac63519541 254 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
Michael J. Spencer 1:f5ac63519541 255 s8_t empty = ARP_TABLE_SIZE;
Michael J. Spencer 1:f5ac63519541 256 u8_t i = 0, age_pending = 0, age_stable = 0;
Michael J. Spencer 1:f5ac63519541 257 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 258 /* oldest entry with packets on queue */
Michael J. Spencer 1:f5ac63519541 259 s8_t old_queue = ARP_TABLE_SIZE;
Michael J. Spencer 1:f5ac63519541 260 /* its age */
Michael J. Spencer 1:f5ac63519541 261 u8_t age_queue = 0;
Michael J. Spencer 1:f5ac63519541 262 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 263
Michael J. Spencer 1:f5ac63519541 264 /**
Michael J. Spencer 1:f5ac63519541 265 * a) do a search through the cache, remember candidates
Michael J. Spencer 1:f5ac63519541 266 * b) select candidate entry
Michael J. Spencer 1:f5ac63519541 267 * c) create new entry
Michael J. Spencer 1:f5ac63519541 268 */
Michael J. Spencer 1:f5ac63519541 269
Michael J. Spencer 1:f5ac63519541 270 /* a) in a single search sweep, do all of this
Michael J. Spencer 1:f5ac63519541 271 * 1) remember the first empty entry (if any)
Michael J. Spencer 1:f5ac63519541 272 * 2) remember the oldest stable entry (if any)
Michael J. Spencer 1:f5ac63519541 273 * 3) remember the oldest pending entry without queued packets (if any)
Michael J. Spencer 1:f5ac63519541 274 * 4) remember the oldest pending entry with queued packets (if any)
Michael J. Spencer 1:f5ac63519541 275 * 5) search for a matching IP entry, either pending or stable
Michael J. Spencer 1:f5ac63519541 276 * until 5 matches, or all entries are searched for.
Michael J. Spencer 1:f5ac63519541 277 */
Michael J. Spencer 1:f5ac63519541 278
Michael J. Spencer 1:f5ac63519541 279 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
Michael J. Spencer 1:f5ac63519541 280 u8_t state = arp_table[i].state;
Michael J. Spencer 1:f5ac63519541 281 /* no empty entry found yet and now we do find one? */
Michael J. Spencer 1:f5ac63519541 282 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
Michael J. Spencer 1:f5ac63519541 283 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
Michael J. Spencer 1:f5ac63519541 284 /* remember first empty entry */
Michael J. Spencer 1:f5ac63519541 285 empty = i;
Michael J. Spencer 1:f5ac63519541 286 } else if (state != ETHARP_STATE_EMPTY) {
Michael J. Spencer 1:f5ac63519541 287 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE",
Michael J. Spencer 1:f5ac63519541 288 state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE);
Michael J. Spencer 1:f5ac63519541 289 /* if given, does IP address match IP address in ARP entry? */
Michael J. Spencer 1:f5ac63519541 290 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
Michael J. Spencer 1:f5ac63519541 291 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
Michael J. Spencer 1:f5ac63519541 292 /* found exact IP address match, simply bail out */
Michael J. Spencer 1:f5ac63519541 293 return i;
Michael J. Spencer 1:f5ac63519541 294 }
Michael J. Spencer 1:f5ac63519541 295 /* pending entry? */
Michael J. Spencer 1:f5ac63519541 296 if (state == ETHARP_STATE_PENDING) {
Michael J. Spencer 1:f5ac63519541 297 /* pending with queued packets? */
Michael J. Spencer 1:f5ac63519541 298 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 299 if (arp_table[i].q != NULL) {
Michael J. Spencer 1:f5ac63519541 300 if (arp_table[i].ctime >= age_queue) {
Michael J. Spencer 1:f5ac63519541 301 old_queue = i;
Michael J. Spencer 1:f5ac63519541 302 age_queue = arp_table[i].ctime;
Michael J. Spencer 1:f5ac63519541 303 }
Michael J. Spencer 1:f5ac63519541 304 } else
Michael J. Spencer 1:f5ac63519541 305 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 306 /* pending without queued packets? */
Michael J. Spencer 1:f5ac63519541 307 {
Michael J. Spencer 1:f5ac63519541 308 if (arp_table[i].ctime >= age_pending) {
Michael J. Spencer 1:f5ac63519541 309 old_pending = i;
Michael J. Spencer 1:f5ac63519541 310 age_pending = arp_table[i].ctime;
Michael J. Spencer 1:f5ac63519541 311 }
Michael J. Spencer 1:f5ac63519541 312 }
Michael J. Spencer 1:f5ac63519541 313 /* stable entry? */
Michael J. Spencer 1:f5ac63519541 314 } else if (state == ETHARP_STATE_STABLE) {
Michael J. Spencer 1:f5ac63519541 315 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 316 /* don't record old_stable for static entries since they never expire */
Michael J. Spencer 1:f5ac63519541 317 if (arp_table[i].static_entry == 0)
Michael J. Spencer 1:f5ac63519541 318 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 319 {
Michael J. Spencer 1:f5ac63519541 320 /* remember entry with oldest stable entry in oldest, its age in maxtime */
Michael J. Spencer 1:f5ac63519541 321 if (arp_table[i].ctime >= age_stable) {
Michael J. Spencer 1:f5ac63519541 322 old_stable = i;
Michael J. Spencer 1:f5ac63519541 323 age_stable = arp_table[i].ctime;
Michael J. Spencer 1:f5ac63519541 324 }
Michael J. Spencer 1:f5ac63519541 325 }
Michael J. Spencer 1:f5ac63519541 326 }
Michael J. Spencer 1:f5ac63519541 327 }
Michael J. Spencer 1:f5ac63519541 328 }
Michael J. Spencer 1:f5ac63519541 329 /* { we have no match } => try to create a new entry */
Michael J. Spencer 1:f5ac63519541 330
Michael J. Spencer 1:f5ac63519541 331 /* don't create new entry, only search? */
Michael J. Spencer 1:f5ac63519541 332 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
Michael J. Spencer 1:f5ac63519541 333 /* or no empty entry found and not allowed to recycle? */
Michael J. Spencer 1:f5ac63519541 334 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
Michael J. Spencer 1:f5ac63519541 335 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
Michael J. Spencer 1:f5ac63519541 336 return (s8_t)ERR_MEM;
Michael J. Spencer 1:f5ac63519541 337 }
Michael J. Spencer 1:f5ac63519541 338
Michael J. Spencer 1:f5ac63519541 339 /* b) choose the least destructive entry to recycle:
Michael J. Spencer 1:f5ac63519541 340 * 1) empty entry
Michael J. Spencer 1:f5ac63519541 341 * 2) oldest stable entry
Michael J. Spencer 1:f5ac63519541 342 * 3) oldest pending entry without queued packets
Michael J. Spencer 1:f5ac63519541 343 * 4) oldest pending entry with queued packets
Michael J. Spencer 1:f5ac63519541 344 *
Michael J. Spencer 1:f5ac63519541 345 * { ETHARP_FLAG_TRY_HARD is set at this point }
Michael J. Spencer 1:f5ac63519541 346 */
Michael J. Spencer 1:f5ac63519541 347
Michael J. Spencer 1:f5ac63519541 348 /* 1) empty entry available? */
Michael J. Spencer 1:f5ac63519541 349 if (empty < ARP_TABLE_SIZE) {
Michael J. Spencer 1:f5ac63519541 350 i = empty;
Michael J. Spencer 1:f5ac63519541 351 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
Michael J. Spencer 1:f5ac63519541 352 } else {
Michael J. Spencer 1:f5ac63519541 353 /* 2) found recyclable stable entry? */
Michael J. Spencer 1:f5ac63519541 354 if (old_stable < ARP_TABLE_SIZE) {
Michael J. Spencer 1:f5ac63519541 355 /* recycle oldest stable*/
Michael J. Spencer 1:f5ac63519541 356 i = old_stable;
Michael J. Spencer 1:f5ac63519541 357 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
Michael J. Spencer 1:f5ac63519541 358 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 359 /* no queued packets should exist on stable entries */
Michael J. Spencer 1:f5ac63519541 360 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
Michael J. Spencer 1:f5ac63519541 361 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 362 /* 3) found recyclable pending entry without queued packets? */
Michael J. Spencer 1:f5ac63519541 363 } else if (old_pending < ARP_TABLE_SIZE) {
Michael J. Spencer 1:f5ac63519541 364 /* recycle oldest pending */
Michael J. Spencer 1:f5ac63519541 365 i = old_pending;
Michael J. Spencer 1:f5ac63519541 366 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
Michael J. Spencer 1:f5ac63519541 367 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 368 /* 4) found recyclable pending entry with queued packets? */
Michael J. Spencer 1:f5ac63519541 369 } else if (old_queue < ARP_TABLE_SIZE) {
Michael J. Spencer 1:f5ac63519541 370 /* recycle oldest pending (queued packets are free in free_entry) */
Michael J. Spencer 1:f5ac63519541 371 i = old_queue;
Michael J. Spencer 1:f5ac63519541 372 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)));
Michael J. Spencer 1:f5ac63519541 373 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 374 /* no empty or recyclable entries found */
Michael J. Spencer 1:f5ac63519541 375 } else {
Michael J. Spencer 1:f5ac63519541 376 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
Michael J. Spencer 1:f5ac63519541 377 return (s8_t)ERR_MEM;
Michael J. Spencer 1:f5ac63519541 378 }
Michael J. Spencer 1:f5ac63519541 379
Michael J. Spencer 1:f5ac63519541 380 /* { empty or recyclable entry found } */
Michael J. Spencer 1:f5ac63519541 381 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
Michael J. Spencer 1:f5ac63519541 382 free_entry(i);
Michael J. Spencer 1:f5ac63519541 383 }
Michael J. Spencer 1:f5ac63519541 384
Michael J. Spencer 1:f5ac63519541 385 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
Michael J. Spencer 1:f5ac63519541 386 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
Michael J. Spencer 1:f5ac63519541 387 arp_table[i].state == ETHARP_STATE_EMPTY);
Michael J. Spencer 1:f5ac63519541 388
Michael J. Spencer 1:f5ac63519541 389 /* IP address given? */
Michael J. Spencer 1:f5ac63519541 390 if (ipaddr != NULL) {
Michael J. Spencer 1:f5ac63519541 391 /* set IP address */
Michael J. Spencer 1:f5ac63519541 392 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
Michael J. Spencer 1:f5ac63519541 393 }
Michael J. Spencer 1:f5ac63519541 394 arp_table[i].ctime = 0;
Michael J. Spencer 1:f5ac63519541 395 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 396 arp_table[i].static_entry = 0;
Michael J. Spencer 1:f5ac63519541 397 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 398 return (err_t)i;
Michael J. Spencer 1:f5ac63519541 399 }
Michael J. Spencer 1:f5ac63519541 400
Michael J. Spencer 1:f5ac63519541 401 /**
Michael J. Spencer 1:f5ac63519541 402 * Send an IP packet on the network using netif->linkoutput
Michael J. Spencer 1:f5ac63519541 403 * The ethernet header is filled in before sending.
Michael J. Spencer 1:f5ac63519541 404 *
Michael J. Spencer 1:f5ac63519541 405 * @params netif the lwIP network interface on which to send the packet
Michael J. Spencer 1:f5ac63519541 406 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
Michael J. Spencer 1:f5ac63519541 407 * @params src the source MAC address to be copied into the ethernet header
Michael J. Spencer 1:f5ac63519541 408 * @params dst the destination MAC address to be copied into the ethernet header
Michael J. Spencer 1:f5ac63519541 409 * @return ERR_OK if the packet was sent, any other err_t on failure
Michael J. Spencer 1:f5ac63519541 410 */
Michael J. Spencer 1:f5ac63519541 411 static err_t
Michael J. Spencer 1:f5ac63519541 412 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
Michael J. Spencer 1:f5ac63519541 413 {
Michael J. Spencer 1:f5ac63519541 414 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 415
Michael J. Spencer 1:f5ac63519541 416 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
Michael J. Spencer 1:f5ac63519541 417 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
Michael J. Spencer 1:f5ac63519541 418 ETHADDR32_COPY(&ethhdr->dest, dst);
Michael J. Spencer 1:f5ac63519541 419 ETHADDR16_COPY(&ethhdr->src, src);
Michael J. Spencer 1:f5ac63519541 420 ethhdr->type = PP_HTONS(ETHTYPE_IP);
Michael J. Spencer 1:f5ac63519541 421 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
Michael J. Spencer 1:f5ac63519541 422 /* send the packet */
Michael J. Spencer 1:f5ac63519541 423 return netif->linkoutput(netif, p);
Michael J. Spencer 1:f5ac63519541 424 }
Michael J. Spencer 1:f5ac63519541 425
Michael J. Spencer 1:f5ac63519541 426 /**
Michael J. Spencer 1:f5ac63519541 427 * Update (or insert) a IP/MAC address pair in the ARP cache.
Michael J. Spencer 1:f5ac63519541 428 *
Michael J. Spencer 1:f5ac63519541 429 * If a pending entry is resolved, any queued packets will be sent
Michael J. Spencer 1:f5ac63519541 430 * at this point.
Michael J. Spencer 1:f5ac63519541 431 *
Michael J. Spencer 1:f5ac63519541 432 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
Michael J. Spencer 1:f5ac63519541 433 * @param ipaddr IP address of the inserted ARP entry.
Michael J. Spencer 1:f5ac63519541 434 * @param ethaddr Ethernet address of the inserted ARP entry.
Michael J. Spencer 1:f5ac63519541 435 * @param flags @see definition of ETHARP_FLAG_*
Michael J. Spencer 1:f5ac63519541 436 *
Michael J. Spencer 1:f5ac63519541 437 * @return
Michael J. Spencer 1:f5ac63519541 438 * - ERR_OK Succesfully updated ARP cache.
Michael J. Spencer 1:f5ac63519541 439 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
Michael J. Spencer 1:f5ac63519541 440 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
Michael J. Spencer 1:f5ac63519541 441 *
Michael J. Spencer 1:f5ac63519541 442 * @see pbuf_free()
Michael J. Spencer 1:f5ac63519541 443 */
Michael J. Spencer 1:f5ac63519541 444 static err_t
Michael J. Spencer 1:f5ac63519541 445 update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
Michael J. Spencer 1:f5ac63519541 446 {
Michael J. Spencer 1:f5ac63519541 447 s8_t i;
Michael J. Spencer 1:f5ac63519541 448 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
Michael J. Spencer 1:f5ac63519541 449 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",
Michael J. Spencer 1:f5ac63519541 450 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
Michael J. Spencer 1:f5ac63519541 451 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
Michael J. Spencer 1:f5ac63519541 452 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
Michael J. Spencer 1:f5ac63519541 453 /* non-unicast address? */
Michael J. Spencer 1:f5ac63519541 454 if (ip_addr_isany(ipaddr) ||
Michael J. Spencer 1:f5ac63519541 455 ip_addr_isbroadcast(ipaddr, netif) ||
Michael J. Spencer 1:f5ac63519541 456 ip_addr_ismulticast(ipaddr)) {
Michael J. Spencer 1:f5ac63519541 457 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
Michael J. Spencer 1:f5ac63519541 458 return ERR_ARG;
Michael J. Spencer 1:f5ac63519541 459 }
Michael J. Spencer 1:f5ac63519541 460 /* find or create ARP entry */
Michael J. Spencer 1:f5ac63519541 461 i = find_entry(ipaddr, flags);
Michael J. Spencer 1:f5ac63519541 462 /* bail out if no entry could be found */
Michael J. Spencer 1:f5ac63519541 463 if (i < 0) {
Michael J. Spencer 1:f5ac63519541 464 return (err_t)i;
Michael J. Spencer 1:f5ac63519541 465 }
Michael J. Spencer 1:f5ac63519541 466
Michael J. Spencer 1:f5ac63519541 467 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 468 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
Michael J. Spencer 1:f5ac63519541 469 /* record static type */
Michael J. Spencer 1:f5ac63519541 470 arp_table[i].static_entry = 1;
Michael J. Spencer 1:f5ac63519541 471 }
Michael J. Spencer 1:f5ac63519541 472 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 473
Michael J. Spencer 1:f5ac63519541 474 /* mark it stable */
Michael J. Spencer 1:f5ac63519541 475 arp_table[i].state = ETHARP_STATE_STABLE;
Michael J. Spencer 1:f5ac63519541 476
Michael J. Spencer 1:f5ac63519541 477 #if LWIP_SNMP
Michael J. Spencer 1:f5ac63519541 478 /* record network interface */
Michael J. Spencer 1:f5ac63519541 479 arp_table[i].netif = netif;
Michael J. Spencer 1:f5ac63519541 480 #endif /* LWIP_SNMP */
Michael J. Spencer 1:f5ac63519541 481 /* insert in SNMP ARP index tree */
Michael J. Spencer 1:f5ac63519541 482 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
Michael J. Spencer 1:f5ac63519541 483
Michael J. Spencer 1:f5ac63519541 484 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
Michael J. Spencer 1:f5ac63519541 485 /* update address */
Michael J. Spencer 1:f5ac63519541 486 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
Michael J. Spencer 1:f5ac63519541 487 /* reset time stamp */
Michael J. Spencer 1:f5ac63519541 488 arp_table[i].ctime = 0;
Michael J. Spencer 1:f5ac63519541 489 #if ARP_QUEUEING
Michael J. Spencer 1:f5ac63519541 490 /* this is where we will send out queued packets! */
Michael J. Spencer 1:f5ac63519541 491 while (arp_table[i].q != NULL) {
Michael J. Spencer 1:f5ac63519541 492 struct pbuf *p;
Michael J. Spencer 1:f5ac63519541 493 /* remember remainder of queue */
Michael J. Spencer 1:f5ac63519541 494 struct etharp_q_entry *q = arp_table[i].q;
Michael J. Spencer 1:f5ac63519541 495 /* pop first item off the queue */
Michael J. Spencer 1:f5ac63519541 496 arp_table[i].q = q->next;
Michael J. Spencer 1:f5ac63519541 497 /* get the packet pointer */
Michael J. Spencer 1:f5ac63519541 498 p = q->p;
Michael J. Spencer 1:f5ac63519541 499 /* now queue entry can be freed */
Michael J. Spencer 1:f5ac63519541 500 memp_free(MEMP_ARP_QUEUE, q);
Michael J. Spencer 1:f5ac63519541 501 /* send the queued IP packet */
Michael J. Spencer 1:f5ac63519541 502 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
Michael J. Spencer 1:f5ac63519541 503 /* free the queued IP packet */
Michael J. Spencer 1:f5ac63519541 504 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 505 }
Michael J. Spencer 1:f5ac63519541 506 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 507 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 508 }
Michael J. Spencer 1:f5ac63519541 509
Michael J. Spencer 1:f5ac63519541 510 #if ETHARP_SUPPORT_STATIC_ENTRIES
Michael J. Spencer 1:f5ac63519541 511 /** Add a new static entry to the ARP table. If an entry exists for the
Michael J. Spencer 1:f5ac63519541 512 * specified IP address, this entry is overwritten.
Michael J. Spencer 1:f5ac63519541 513 * If packets are queued for the specified IP address, they are sent out.
Michael J. Spencer 1:f5ac63519541 514 *
Michael J. Spencer 1:f5ac63519541 515 * @param ipaddr IP address for the new static entry
Michael J. Spencer 1:f5ac63519541 516 * @param ethaddr ethernet address for the new static entry
Michael J. Spencer 1:f5ac63519541 517 * @return @see return values of etharp_add_static_entry
Michael J. Spencer 1:f5ac63519541 518 */
Michael J. Spencer 1:f5ac63519541 519 err_t
Michael J. Spencer 1:f5ac63519541 520 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
Michael J. Spencer 1:f5ac63519541 521 {
Michael J. Spencer 1:f5ac63519541 522 struct netif *netif;
Michael J. Spencer 1:f5ac63519541 523 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",
Michael J. Spencer 1:f5ac63519541 524 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
Michael J. Spencer 1:f5ac63519541 525 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
Michael J. Spencer 1:f5ac63519541 526 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
Michael J. Spencer 1:f5ac63519541 527
Michael J. Spencer 1:f5ac63519541 528 netif = ip_route(ipaddr);
Michael J. Spencer 1:f5ac63519541 529 if (netif == NULL) {
Michael J. Spencer 1:f5ac63519541 530 return ERR_RTE;
Michael J. Spencer 1:f5ac63519541 531 }
Michael J. Spencer 1:f5ac63519541 532
Michael J. Spencer 1:f5ac63519541 533 return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
Michael J. Spencer 1:f5ac63519541 534 }
Michael J. Spencer 1:f5ac63519541 535
Michael J. Spencer 1:f5ac63519541 536 /** Remove a static entry from the ARP table previously added with a call to
Michael J. Spencer 1:f5ac63519541 537 * etharp_add_static_entry.
Michael J. Spencer 1:f5ac63519541 538 *
Michael J. Spencer 1:f5ac63519541 539 * @param ipaddr IP address of the static entry to remove
Michael J. Spencer 1:f5ac63519541 540 * @return ERR_OK: entry removed
Michael J. Spencer 1:f5ac63519541 541 * ERR_MEM: entry wasn't found
Michael J. Spencer 1:f5ac63519541 542 * ERR_ARG: entry wasn't a static entry but a dynamic one
Michael J. Spencer 1:f5ac63519541 543 */
Michael J. Spencer 1:f5ac63519541 544 err_t
Michael J. Spencer 1:f5ac63519541 545 etharp_remove_static_entry(ip_addr_t *ipaddr)
Michael J. Spencer 1:f5ac63519541 546 {
Michael J. Spencer 1:f5ac63519541 547 s8_t i;
Michael J. Spencer 1:f5ac63519541 548 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 549 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
Michael J. Spencer 1:f5ac63519541 550
Michael J. Spencer 1:f5ac63519541 551 /* find or create ARP entry */
Michael J. Spencer 1:f5ac63519541 552 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
Michael J. Spencer 1:f5ac63519541 553 /* bail out if no entry could be found */
Michael J. Spencer 1:f5ac63519541 554 if (i < 0) {
Michael J. Spencer 1:f5ac63519541 555 return (err_t)i;
Michael J. Spencer 1:f5ac63519541 556 }
Michael J. Spencer 1:f5ac63519541 557
Michael J. Spencer 1:f5ac63519541 558 if ((arp_table[i].state != ETHARP_STATE_STABLE) ||
Michael J. Spencer 1:f5ac63519541 559 (arp_table[i].static_entry == 0)) {
Michael J. Spencer 1:f5ac63519541 560 /* entry wasn't a static entry, cannot remove it */
Michael J. Spencer 1:f5ac63519541 561 return ERR_ARG;
Michael J. Spencer 1:f5ac63519541 562 }
Michael J. Spencer 1:f5ac63519541 563 /* entry found, free it */
Michael J. Spencer 1:f5ac63519541 564 free_entry(i);
Michael J. Spencer 1:f5ac63519541 565 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 566 }
Michael J. Spencer 1:f5ac63519541 567 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Michael J. Spencer 1:f5ac63519541 568
Michael J. Spencer 1:f5ac63519541 569 /**
Michael J. Spencer 1:f5ac63519541 570 * Finds (stable) ethernet/IP address pair from ARP table
Michael J. Spencer 1:f5ac63519541 571 * using interface and IP address index.
Michael J. Spencer 1:f5ac63519541 572 * @note the addresses in the ARP table are in network order!
Michael J. Spencer 1:f5ac63519541 573 *
Michael J. Spencer 1:f5ac63519541 574 * @param netif points to interface index
Michael J. Spencer 1:f5ac63519541 575 * @param ipaddr points to the (network order) IP address index
Michael J. Spencer 1:f5ac63519541 576 * @param eth_ret points to return pointer
Michael J. Spencer 1:f5ac63519541 577 * @param ip_ret points to return pointer
Michael J. Spencer 1:f5ac63519541 578 * @return table index if found, -1 otherwise
Michael J. Spencer 1:f5ac63519541 579 */
Michael J. Spencer 1:f5ac63519541 580 s8_t
Michael J. Spencer 1:f5ac63519541 581 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
Michael J. Spencer 1:f5ac63519541 582 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
Michael J. Spencer 1:f5ac63519541 583 {
Michael J. Spencer 1:f5ac63519541 584 s8_t i;
Michael J. Spencer 1:f5ac63519541 585
Michael J. Spencer 1:f5ac63519541 586 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
Michael J. Spencer 1:f5ac63519541 587 eth_ret != NULL && ip_ret != NULL);
Michael J. Spencer 1:f5ac63519541 588
Michael J. Spencer 1:f5ac63519541 589 LWIP_UNUSED_ARG(netif);
Michael J. Spencer 1:f5ac63519541 590
Michael J. Spencer 1:f5ac63519541 591 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
Michael J. Spencer 1:f5ac63519541 592 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
Michael J. Spencer 1:f5ac63519541 593 *eth_ret = &arp_table[i].ethaddr;
Michael J. Spencer 1:f5ac63519541 594 *ip_ret = &arp_table[i].ipaddr;
Michael J. Spencer 1:f5ac63519541 595 return i;
Michael J. Spencer 1:f5ac63519541 596 }
Michael J. Spencer 1:f5ac63519541 597 return -1;
Michael J. Spencer 1:f5ac63519541 598 }
Michael J. Spencer 1:f5ac63519541 599
Michael J. Spencer 1:f5ac63519541 600 #if ETHARP_TRUST_IP_MAC
Michael J. Spencer 1:f5ac63519541 601 /**
Michael J. Spencer 1:f5ac63519541 602 * Updates the ARP table using the given IP packet.
Michael J. Spencer 1:f5ac63519541 603 *
Michael J. Spencer 1:f5ac63519541 604 * Uses the incoming IP packet's source address to update the
Michael J. Spencer 1:f5ac63519541 605 * ARP cache for the local network. The function does not alter
Michael J. Spencer 1:f5ac63519541 606 * or free the packet. This function must be called before the
Michael J. Spencer 1:f5ac63519541 607 * packet p is passed to the IP layer.
Michael J. Spencer 1:f5ac63519541 608 *
Michael J. Spencer 1:f5ac63519541 609 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
Michael J. Spencer 1:f5ac63519541 610 * @param p The IP packet that arrived on netif.
Michael J. Spencer 1:f5ac63519541 611 *
Michael J. Spencer 1:f5ac63519541 612 * @return NULL
Michael J. Spencer 1:f5ac63519541 613 *
Michael J. Spencer 1:f5ac63519541 614 * @see pbuf_free()
Michael J. Spencer 1:f5ac63519541 615 */
Michael J. Spencer 1:f5ac63519541 616 static void
Michael J. Spencer 1:f5ac63519541 617 etharp_ip_input(struct netif *netif, struct pbuf *p)
Michael J. Spencer 1:f5ac63519541 618 {
Michael J. Spencer 1:f5ac63519541 619 struct eth_hdr *ethhdr;
Michael J. Spencer 1:f5ac63519541 620 struct ip_hdr *iphdr;
Michael J. Spencer 1:f5ac63519541 621 ip_addr_t iphdr_src;
Michael J. Spencer 1:f5ac63519541 622 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
Michael J. Spencer 1:f5ac63519541 623
Michael J. Spencer 1:f5ac63519541 624 /* Only insert an entry if the source IP address of the
Michael J. Spencer 1:f5ac63519541 625 incoming IP packet comes from a host on the local network. */
Michael J. Spencer 1:f5ac63519541 626 ethhdr = (struct eth_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 627 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
Michael J. Spencer 1:f5ac63519541 628 #if ETHARP_SUPPORT_VLAN
Michael J. Spencer 1:f5ac63519541 629 if (ethhdr->type == ETHTYPE_VLAN) {
Michael J. Spencer 1:f5ac63519541 630 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
Michael J. Spencer 1:f5ac63519541 631 }
Michael J. Spencer 1:f5ac63519541 632 #endif /* ETHARP_SUPPORT_VLAN */
Michael J. Spencer 1:f5ac63519541 633
Michael J. Spencer 1:f5ac63519541 634 ip_addr_copy(iphdr_src, iphdr->src);
Michael J. Spencer 1:f5ac63519541 635
Michael J. Spencer 1:f5ac63519541 636 /* source is not on the local network? */
Michael J. Spencer 1:f5ac63519541 637 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
Michael J. Spencer 1:f5ac63519541 638 /* do nothing */
Michael J. Spencer 1:f5ac63519541 639 return;
Michael J. Spencer 1:f5ac63519541 640 }
Michael J. Spencer 1:f5ac63519541 641
Michael J. Spencer 1:f5ac63519541 642 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
Michael J. Spencer 1:f5ac63519541 643 /* update the source IP address in the cache, if present */
Michael J. Spencer 1:f5ac63519541 644 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
Michael J. Spencer 1:f5ac63519541 645 * back soon (for example, if the destination IP address is ours. */
Michael J. Spencer 1:f5ac63519541 646 update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
Michael J. Spencer 1:f5ac63519541 647 }
Michael J. Spencer 1:f5ac63519541 648 #endif /* ETHARP_TRUST_IP_MAC */
Michael J. Spencer 1:f5ac63519541 649
Michael J. Spencer 1:f5ac63519541 650 /**
Michael J. Spencer 1:f5ac63519541 651 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
Michael J. Spencer 1:f5ac63519541 652 * send out queued IP packets. Updates cache with snooped address pairs.
Michael J. Spencer 1:f5ac63519541 653 *
Michael J. Spencer 1:f5ac63519541 654 * Should be called for incoming ARP packets. The pbuf in the argument
Michael J. Spencer 1:f5ac63519541 655 * is freed by this function.
Michael J. Spencer 1:f5ac63519541 656 *
Michael J. Spencer 1:f5ac63519541 657 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
Michael J. Spencer 1:f5ac63519541 658 * @param ethaddr Ethernet address of netif.
Michael J. Spencer 1:f5ac63519541 659 * @param p The ARP packet that arrived on netif. Is freed by this function.
Michael J. Spencer 1:f5ac63519541 660 *
Michael J. Spencer 1:f5ac63519541 661 * @return NULL
Michael J. Spencer 1:f5ac63519541 662 *
Michael J. Spencer 1:f5ac63519541 663 * @see pbuf_free()
Michael J. Spencer 1:f5ac63519541 664 */
Michael J. Spencer 1:f5ac63519541 665 static void
Michael J. Spencer 1:f5ac63519541 666 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
Michael J. Spencer 1:f5ac63519541 667 {
Michael J. Spencer 1:f5ac63519541 668 struct etharp_hdr *hdr;
Michael J. Spencer 1:f5ac63519541 669 struct eth_hdr *ethhdr;
Michael J. Spencer 1:f5ac63519541 670 /* these are aligned properly, whereas the ARP header fields might not be */
Michael J. Spencer 1:f5ac63519541 671 ip_addr_t sipaddr, dipaddr;
Michael J. Spencer 1:f5ac63519541 672 u8_t for_us;
Michael J. Spencer 1:f5ac63519541 673 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 674 const u8_t * ethdst_hwaddr;
Michael J. Spencer 1:f5ac63519541 675 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 676
Michael J. Spencer 1:f5ac63519541 677 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
Michael J. Spencer 1:f5ac63519541 678
Michael J. Spencer 1:f5ac63519541 679 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
Michael J. Spencer 1:f5ac63519541 680 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
Michael J. Spencer 1:f5ac63519541 681 if (p->len < SIZEOF_ETHARP_PACKET) {
Michael J. Spencer 1:f5ac63519541 682 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
Michael J. Spencer 1:f5ac63519541 683 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
Michael J. Spencer 1:f5ac63519541 684 (s16_t)SIZEOF_ETHARP_PACKET));
Michael J. Spencer 1:f5ac63519541 685 ETHARP_STATS_INC(etharp.lenerr);
Michael J. Spencer 1:f5ac63519541 686 ETHARP_STATS_INC(etharp.drop);
Michael J. Spencer 1:f5ac63519541 687 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 688 return;
Michael J. Spencer 1:f5ac63519541 689 }
Michael J. Spencer 1:f5ac63519541 690
Michael J. Spencer 1:f5ac63519541 691 ethhdr = (struct eth_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 692 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
Michael J. Spencer 1:f5ac63519541 693 #if ETHARP_SUPPORT_VLAN
Michael J. Spencer 1:f5ac63519541 694 if (ethhdr->type == ETHTYPE_VLAN) {
Michael J. Spencer 1:f5ac63519541 695 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
Michael J. Spencer 1:f5ac63519541 696 }
Michael J. Spencer 1:f5ac63519541 697 #endif /* ETHARP_SUPPORT_VLAN */
Michael J. Spencer 1:f5ac63519541 698
Michael J. Spencer 1:f5ac63519541 699 /* RFC 826 "Packet Reception": */
Michael J. Spencer 1:f5ac63519541 700 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
Michael J. Spencer 1:f5ac63519541 701 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
Michael J. Spencer 1:f5ac63519541 702 (hdr->protolen != sizeof(ip_addr_t)) ||
Michael J. Spencer 1:f5ac63519541 703 (hdr->proto != PP_HTONS(ETHTYPE_IP)) ||
Michael J. Spencer 1:f5ac63519541 704 (ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
Michael J. Spencer 1:f5ac63519541 705 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
Michael J. Spencer 1:f5ac63519541 706 ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
Michael J. Spencer 1:f5ac63519541 707 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
Michael J. Spencer 1:f5ac63519541 708 ETHARP_STATS_INC(etharp.proterr);
Michael J. Spencer 1:f5ac63519541 709 ETHARP_STATS_INC(etharp.drop);
Michael J. Spencer 1:f5ac63519541 710 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 711 return;
Michael J. Spencer 1:f5ac63519541 712 }
Michael J. Spencer 1:f5ac63519541 713 ETHARP_STATS_INC(etharp.recv);
Michael J. Spencer 1:f5ac63519541 714
Michael J. Spencer 1:f5ac63519541 715 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 716 /* We have to check if a host already has configured our random
Michael J. Spencer 1:f5ac63519541 717 * created link local address and continously check if there is
Michael J. Spencer 1:f5ac63519541 718 * a host with this IP-address so we can detect collisions */
Michael J. Spencer 1:f5ac63519541 719 autoip_arp_reply(netif, hdr);
Michael J. Spencer 1:f5ac63519541 720 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 721
Michael J. Spencer 1:f5ac63519541 722 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
Michael J. Spencer 1:f5ac63519541 723 * structure packing (not using structure copy which breaks strict-aliasing rules). */
Michael J. Spencer 1:f5ac63519541 724 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
Michael J. Spencer 1:f5ac63519541 725 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
Michael J. Spencer 1:f5ac63519541 726
Michael J. Spencer 1:f5ac63519541 727 /* this interface is not configured? */
Michael J. Spencer 1:f5ac63519541 728 if (ip_addr_isany(&netif->ip_addr)) {
Michael J. Spencer 1:f5ac63519541 729 for_us = 0;
Michael J. Spencer 1:f5ac63519541 730 } else {
Michael J. Spencer 1:f5ac63519541 731 /* ARP packet directed to us? */
Michael J. Spencer 1:f5ac63519541 732 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
Michael J. Spencer 1:f5ac63519541 733 }
Michael J. Spencer 1:f5ac63519541 734
Michael J. Spencer 1:f5ac63519541 735 /* ARP message directed to us?
Michael J. Spencer 1:f5ac63519541 736 -> add IP address in ARP cache; assume requester wants to talk to us,
Michael J. Spencer 1:f5ac63519541 737 can result in directly sending the queued packets for this host.
Michael J. Spencer 1:f5ac63519541 738 ARP message not directed to us?
Michael J. Spencer 1:f5ac63519541 739 -> update the source IP address in the cache, if present */
Michael J. Spencer 1:f5ac63519541 740 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
Michael J. Spencer 1:f5ac63519541 741 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
Michael J. Spencer 1:f5ac63519541 742
Michael J. Spencer 1:f5ac63519541 743 /* now act on the message itself */
Michael J. Spencer 1:f5ac63519541 744 switch (hdr->opcode) {
Michael J. Spencer 1:f5ac63519541 745 /* ARP request? */
Michael J. Spencer 1:f5ac63519541 746 case PP_HTONS(ARP_REQUEST):
Michael J. Spencer 1:f5ac63519541 747 /* ARP request. If it asked for our address, we send out a
Michael J. Spencer 1:f5ac63519541 748 * reply. In any case, we time-stamp any existing ARP entry,
Michael J. Spencer 1:f5ac63519541 749 * and possiby send out an IP packet that was queued on it. */
Michael J. Spencer 1:f5ac63519541 750
Michael J. Spencer 1:f5ac63519541 751 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
Michael J. Spencer 1:f5ac63519541 752 /* ARP request for our address? */
Michael J. Spencer 1:f5ac63519541 753 if (for_us) {
Michael J. Spencer 1:f5ac63519541 754
Michael J. Spencer 1:f5ac63519541 755 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
Michael J. Spencer 1:f5ac63519541 756 /* Re-use pbuf to send ARP reply.
Michael J. Spencer 1:f5ac63519541 757 Since we are re-using an existing pbuf, we can't call etharp_raw since
Michael J. Spencer 1:f5ac63519541 758 that would allocate a new pbuf. */
Michael J. Spencer 1:f5ac63519541 759 hdr->opcode = htons(ARP_REPLY);
Michael J. Spencer 1:f5ac63519541 760
Michael J. Spencer 1:f5ac63519541 761 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
Michael J. Spencer 1:f5ac63519541 762 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
Michael J. Spencer 1:f5ac63519541 763
Michael J. Spencer 1:f5ac63519541 764 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
Michael J. Spencer 1:f5ac63519541 765 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
Michael J. Spencer 1:f5ac63519541 766 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 767 /* If we are using Link-Local, all ARP packets that contain a Link-Local
Michael J. Spencer 1:f5ac63519541 768 * 'sender IP address' MUST be sent using link-layer broadcast instead of
Michael J. Spencer 1:f5ac63519541 769 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
Michael J. Spencer 1:f5ac63519541 770 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
Michael J. Spencer 1:f5ac63519541 771 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 772
Michael J. Spencer 1:f5ac63519541 773 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
Michael J. Spencer 1:f5ac63519541 774 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 775 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
Michael J. Spencer 1:f5ac63519541 776 #else /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 777 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
Michael J. Spencer 1:f5ac63519541 778 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 779 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
Michael J. Spencer 1:f5ac63519541 780 ETHADDR16_COPY(&ethhdr->src, ethaddr);
Michael J. Spencer 1:f5ac63519541 781
Michael J. Spencer 1:f5ac63519541 782 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
Michael J. Spencer 1:f5ac63519541 783 are already correct, we tested that before */
Michael J. Spencer 1:f5ac63519541 784
Michael J. Spencer 1:f5ac63519541 785 /* return ARP reply */
Michael J. Spencer 1:f5ac63519541 786 netif->linkoutput(netif, p);
Michael J. Spencer 1:f5ac63519541 787 /* we are not configured? */
Michael J. Spencer 1:f5ac63519541 788 } else if (ip_addr_isany(&netif->ip_addr)) {
Michael J. Spencer 1:f5ac63519541 789 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
Michael J. Spencer 1:f5ac63519541 790 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
Michael J. Spencer 1:f5ac63519541 791 /* request was not directed to us */
Michael J. Spencer 1:f5ac63519541 792 } else {
Michael J. Spencer 1:f5ac63519541 793 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
Michael J. Spencer 1:f5ac63519541 794 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
Michael J. Spencer 1:f5ac63519541 795 }
Michael J. Spencer 1:f5ac63519541 796 break;
Michael J. Spencer 1:f5ac63519541 797 case PP_HTONS(ARP_REPLY):
Michael J. Spencer 1:f5ac63519541 798 /* ARP reply. We already updated the ARP cache earlier. */
Michael J. Spencer 1:f5ac63519541 799 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
Michael J. Spencer 1:f5ac63519541 800 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
Michael J. Spencer 1:f5ac63519541 801 /* DHCP wants to know about ARP replies from any host with an
Michael J. Spencer 1:f5ac63519541 802 * IP address also offered to us by the DHCP server. We do not
Michael J. Spencer 1:f5ac63519541 803 * want to take a duplicate IP address on a single network.
Michael J. Spencer 1:f5ac63519541 804 * @todo How should we handle redundant (fail-over) interfaces? */
Michael J. Spencer 1:f5ac63519541 805 dhcp_arp_reply(netif, &sipaddr);
Michael J. Spencer 1:f5ac63519541 806 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
Michael J. Spencer 1:f5ac63519541 807 break;
Michael J. Spencer 1:f5ac63519541 808 default:
Michael J. Spencer 1:f5ac63519541 809 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
Michael J. Spencer 1:f5ac63519541 810 ETHARP_STATS_INC(etharp.err);
Michael J. Spencer 1:f5ac63519541 811 break;
Michael J. Spencer 1:f5ac63519541 812 }
Michael J. Spencer 1:f5ac63519541 813 /* free ARP packet */
Michael J. Spencer 1:f5ac63519541 814 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 815 }
Michael J. Spencer 1:f5ac63519541 816
Michael J. Spencer 1:f5ac63519541 817 /**
Michael J. Spencer 1:f5ac63519541 818 * Resolve and fill-in Ethernet address header for outgoing IP packet.
Michael J. Spencer 1:f5ac63519541 819 *
Michael J. Spencer 1:f5ac63519541 820 * For IP multicast and broadcast, corresponding Ethernet addresses
Michael J. Spencer 1:f5ac63519541 821 * are selected and the packet is transmitted on the link.
Michael J. Spencer 1:f5ac63519541 822 *
Michael J. Spencer 1:f5ac63519541 823 * For unicast addresses, the packet is submitted to etharp_query(). In
Michael J. Spencer 1:f5ac63519541 824 * case the IP address is outside the local network, the IP address of
Michael J. Spencer 1:f5ac63519541 825 * the gateway is used.
Michael J. Spencer 1:f5ac63519541 826 *
Michael J. Spencer 1:f5ac63519541 827 * @param netif The lwIP network interface which the IP packet will be sent on.
Michael J. Spencer 1:f5ac63519541 828 * @param q The pbuf(s) containing the IP packet to be sent.
Michael J. Spencer 1:f5ac63519541 829 * @param ipaddr The IP address of the packet destination.
Michael J. Spencer 1:f5ac63519541 830 *
Michael J. Spencer 1:f5ac63519541 831 * @return
Michael J. Spencer 1:f5ac63519541 832 * - ERR_RTE No route to destination (no gateway to external networks),
Michael J. Spencer 1:f5ac63519541 833 * or the return type of either etharp_query() or etharp_send_ip().
Michael J. Spencer 1:f5ac63519541 834 */
Michael J. Spencer 1:f5ac63519541 835 err_t
Michael J. Spencer 1:f5ac63519541 836 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
Michael J. Spencer 1:f5ac63519541 837 {
Michael J. Spencer 1:f5ac63519541 838 struct eth_addr *dest, mcastaddr;
Michael J. Spencer 1:f5ac63519541 839
Michael J. Spencer 1:f5ac63519541 840 /* make room for Ethernet header - should not fail */
Michael J. Spencer 1:f5ac63519541 841 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
Michael J. Spencer 1:f5ac63519541 842 /* bail out */
Michael J. Spencer 1:f5ac63519541 843 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 844 ("etharp_output: could not allocate room for header.\n"));
Michael J. Spencer 1:f5ac63519541 845 LINK_STATS_INC(link.lenerr);
Michael J. Spencer 1:f5ac63519541 846 return ERR_BUF;
Michael J. Spencer 1:f5ac63519541 847 }
Michael J. Spencer 1:f5ac63519541 848
Michael J. Spencer 1:f5ac63519541 849 /* assume unresolved Ethernet address */
Michael J. Spencer 1:f5ac63519541 850 dest = NULL;
Michael J. Spencer 1:f5ac63519541 851 /* Determine on destination hardware address. Broadcasts and multicasts
Michael J. Spencer 1:f5ac63519541 852 * are special, other IP addresses are looked up in the ARP table. */
Michael J. Spencer 1:f5ac63519541 853
Michael J. Spencer 1:f5ac63519541 854 /* broadcast destination IP address? */
Michael J. Spencer 1:f5ac63519541 855 if (ip_addr_isbroadcast(ipaddr, netif)) {
Michael J. Spencer 1:f5ac63519541 856 /* broadcast on Ethernet also */
Michael J. Spencer 1:f5ac63519541 857 dest = (struct eth_addr *)&ethbroadcast;
Michael J. Spencer 1:f5ac63519541 858 /* multicast destination IP address? */
Michael J. Spencer 1:f5ac63519541 859 } else if (ip_addr_ismulticast(ipaddr)) {
Michael J. Spencer 1:f5ac63519541 860 /* Hash IP multicast address to MAC address.*/
Michael J. Spencer 1:f5ac63519541 861 mcastaddr.addr[0] = 0x01;
Michael J. Spencer 1:f5ac63519541 862 mcastaddr.addr[1] = 0x00;
Michael J. Spencer 1:f5ac63519541 863 mcastaddr.addr[2] = 0x5e;
Michael J. Spencer 1:f5ac63519541 864 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
Michael J. Spencer 1:f5ac63519541 865 mcastaddr.addr[4] = ip4_addr3(ipaddr);
Michael J. Spencer 1:f5ac63519541 866 mcastaddr.addr[5] = ip4_addr4(ipaddr);
Michael J. Spencer 1:f5ac63519541 867 /* destination Ethernet address is multicast */
Michael J. Spencer 1:f5ac63519541 868 dest = &mcastaddr;
Michael J. Spencer 1:f5ac63519541 869 /* unicast destination IP address? */
Michael J. Spencer 1:f5ac63519541 870 } else {
Michael J. Spencer 1:f5ac63519541 871 /* outside local network? */
Michael J. Spencer 1:f5ac63519541 872 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
Michael J. Spencer 1:f5ac63519541 873 !ip_addr_islinklocal(ipaddr)) {
Michael J. Spencer 1:f5ac63519541 874 /* interface has default gateway? */
Michael J. Spencer 1:f5ac63519541 875 if (!ip_addr_isany(&netif->gw)) {
Michael J. Spencer 1:f5ac63519541 876 /* send to hardware address of default gateway IP address */
Michael J. Spencer 1:f5ac63519541 877 ipaddr = &(netif->gw);
Michael J. Spencer 1:f5ac63519541 878 /* no default gateway available */
Michael J. Spencer 1:f5ac63519541 879 } else {
Michael J. Spencer 1:f5ac63519541 880 /* no route to destination error (default gateway missing) */
Michael J. Spencer 1:f5ac63519541 881 return ERR_RTE;
Michael J. Spencer 1:f5ac63519541 882 }
Michael J. Spencer 1:f5ac63519541 883 }
Michael J. Spencer 1:f5ac63519541 884 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 885 if (netif->addr_hint != NULL) {
Michael J. Spencer 1:f5ac63519541 886 /* per-pcb cached entry was given */
Michael J. Spencer 1:f5ac63519541 887 u8_t etharp_cached_entry = *(netif->addr_hint);
Michael J. Spencer 1:f5ac63519541 888 if (etharp_cached_entry < ARP_TABLE_SIZE) {
Michael J. Spencer 1:f5ac63519541 889 #endif /* LWIP_NETIF_HWADDRHINT */
Michael J. Spencer 1:f5ac63519541 890 if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
Michael J. Spencer 1:f5ac63519541 891 (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
Michael J. Spencer 1:f5ac63519541 892 /* the per-pcb-cached entry is stable and the right one! */
Michael J. Spencer 1:f5ac63519541 893 ETHARP_STATS_INC(etharp.cachehit);
Michael J. Spencer 1:f5ac63519541 894 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
Michael J. Spencer 1:f5ac63519541 895 &arp_table[etharp_cached_entry].ethaddr);
Michael J. Spencer 1:f5ac63519541 896 }
Michael J. Spencer 1:f5ac63519541 897 #if LWIP_NETIF_HWADDRHINT
Michael J. Spencer 1:f5ac63519541 898 }
Michael J. Spencer 1:f5ac63519541 899 }
Michael J. Spencer 1:f5ac63519541 900 #endif /* LWIP_NETIF_HWADDRHINT */
Michael J. Spencer 1:f5ac63519541 901 /* queue on destination Ethernet address belonging to ipaddr */
Michael J. Spencer 1:f5ac63519541 902 return etharp_query(netif, ipaddr, q);
Michael J. Spencer 1:f5ac63519541 903 }
Michael J. Spencer 1:f5ac63519541 904
Michael J. Spencer 1:f5ac63519541 905 /* continuation for multicast/broadcast destinations */
Michael J. Spencer 1:f5ac63519541 906 /* obtain source Ethernet address of the given interface */
Michael J. Spencer 1:f5ac63519541 907 /* send packet directly on the link */
Michael J. Spencer 1:f5ac63519541 908 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
Michael J. Spencer 1:f5ac63519541 909 }
Michael J. Spencer 1:f5ac63519541 910
Michael J. Spencer 1:f5ac63519541 911 /**
Michael J. Spencer 1:f5ac63519541 912 * Send an ARP request for the given IP address and/or queue a packet.
Michael J. Spencer 1:f5ac63519541 913 *
Michael J. Spencer 1:f5ac63519541 914 * If the IP address was not yet in the cache, a pending ARP cache entry
Michael J. Spencer 1:f5ac63519541 915 * is added and an ARP request is sent for the given address. The packet
Michael J. Spencer 1:f5ac63519541 916 * is queued on this entry.
Michael J. Spencer 1:f5ac63519541 917 *
Michael J. Spencer 1:f5ac63519541 918 * If the IP address was already pending in the cache, a new ARP request
Michael J. Spencer 1:f5ac63519541 919 * is sent for the given address. The packet is queued on this entry.
Michael J. Spencer 1:f5ac63519541 920 *
Michael J. Spencer 1:f5ac63519541 921 * If the IP address was already stable in the cache, and a packet is
Michael J. Spencer 1:f5ac63519541 922 * given, it is directly sent and no ARP request is sent out.
Michael J. Spencer 1:f5ac63519541 923 *
Michael J. Spencer 1:f5ac63519541 924 * If the IP address was already stable in the cache, and no packet is
Michael J. Spencer 1:f5ac63519541 925 * given, an ARP request is sent out.
Michael J. Spencer 1:f5ac63519541 926 *
Michael J. Spencer 1:f5ac63519541 927 * @param netif The lwIP network interface on which ipaddr
Michael J. Spencer 1:f5ac63519541 928 * must be queried for.
Michael J. Spencer 1:f5ac63519541 929 * @param ipaddr The IP address to be resolved.
Michael J. Spencer 1:f5ac63519541 930 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
Michael J. Spencer 1:f5ac63519541 931 * q is not freed by this function.
Michael J. Spencer 1:f5ac63519541 932 *
Michael J. Spencer 1:f5ac63519541 933 * @note q must only be ONE packet, not a packet queue!
Michael J. Spencer 1:f5ac63519541 934 *
Michael J. Spencer 1:f5ac63519541 935 * @return
Michael J. Spencer 1:f5ac63519541 936 * - ERR_BUF Could not make room for Ethernet header.
Michael J. Spencer 1:f5ac63519541 937 * - ERR_MEM Hardware address unknown, and no more ARP entries available
Michael J. Spencer 1:f5ac63519541 938 * to query for address or queue the packet.
Michael J. Spencer 1:f5ac63519541 939 * - ERR_MEM Could not queue packet due to memory shortage.
Michael J. Spencer 1:f5ac63519541 940 * - ERR_RTE No route to destination (no gateway to external networks).
Michael J. Spencer 1:f5ac63519541 941 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
Michael J. Spencer 1:f5ac63519541 942 *
Michael J. Spencer 1:f5ac63519541 943 */
Michael J. Spencer 1:f5ac63519541 944 err_t
Michael J. Spencer 1:f5ac63519541 945 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
Michael J. Spencer 1:f5ac63519541 946 {
Michael J. Spencer 1:f5ac63519541 947 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
Michael J. Spencer 1:f5ac63519541 948 err_t result = ERR_MEM;
Michael J. Spencer 1:f5ac63519541 949 s8_t i; /* ARP entry index */
Michael J. Spencer 1:f5ac63519541 950
Michael J. Spencer 1:f5ac63519541 951 /* non-unicast address? */
Michael J. Spencer 1:f5ac63519541 952 if (ip_addr_isbroadcast(ipaddr, netif) ||
Michael J. Spencer 1:f5ac63519541 953 ip_addr_ismulticast(ipaddr) ||
Michael J. Spencer 1:f5ac63519541 954 ip_addr_isany(ipaddr)) {
Michael J. Spencer 1:f5ac63519541 955 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
Michael J. Spencer 1:f5ac63519541 956 return ERR_ARG;
Michael J. Spencer 1:f5ac63519541 957 }
Michael J. Spencer 1:f5ac63519541 958
Michael J. Spencer 1:f5ac63519541 959 /* find entry in ARP cache, ask to create entry if queueing packet */
Michael J. Spencer 1:f5ac63519541 960 i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
Michael J. Spencer 1:f5ac63519541 961
Michael J. Spencer 1:f5ac63519541 962 /* could not find or create entry? */
Michael J. Spencer 1:f5ac63519541 963 if (i < 0) {
Michael J. Spencer 1:f5ac63519541 964 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
Michael J. Spencer 1:f5ac63519541 965 if (q) {
Michael J. Spencer 1:f5ac63519541 966 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
Michael J. Spencer 1:f5ac63519541 967 ETHARP_STATS_INC(etharp.memerr);
Michael J. Spencer 1:f5ac63519541 968 }
Michael J. Spencer 1:f5ac63519541 969 return (err_t)i;
Michael J. Spencer 1:f5ac63519541 970 }
Michael J. Spencer 1:f5ac63519541 971
Michael J. Spencer 1:f5ac63519541 972 /* mark a fresh entry as pending (we just sent a request) */
Michael J. Spencer 1:f5ac63519541 973 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
Michael J. Spencer 1:f5ac63519541 974 arp_table[i].state = ETHARP_STATE_PENDING;
Michael J. Spencer 1:f5ac63519541 975 }
Michael J. Spencer 1:f5ac63519541 976
Michael J. Spencer 1:f5ac63519541 977 /* { i is either a STABLE or (new or existing) PENDING entry } */
Michael J. Spencer 1:f5ac63519541 978 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
Michael J. Spencer 1:f5ac63519541 979 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
Michael J. Spencer 1:f5ac63519541 980 (arp_table[i].state == ETHARP_STATE_STABLE)));
Michael J. Spencer 1:f5ac63519541 981
Michael J. Spencer 1:f5ac63519541 982 /* do we have a pending entry? or an implicit query request? */
Michael J. Spencer 1:f5ac63519541 983 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
Michael J. Spencer 1:f5ac63519541 984 /* try to resolve it; send out ARP request */
Michael J. Spencer 1:f5ac63519541 985 result = etharp_request(netif, ipaddr);
Michael J. Spencer 1:f5ac63519541 986 if (result != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 987 /* ARP request couldn't be sent */
Michael J. Spencer 1:f5ac63519541 988 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
Michael J. Spencer 1:f5ac63519541 989 since this failure could be temporary, and the next packet calling
Michael J. Spencer 1:f5ac63519541 990 etharp_query again could lead to sending the queued packets. */
Michael J. Spencer 1:f5ac63519541 991 }
Michael J. Spencer 1:f5ac63519541 992 if (q == NULL) {
Michael J. Spencer 1:f5ac63519541 993 return result;
Michael J. Spencer 1:f5ac63519541 994 }
Michael J. Spencer 1:f5ac63519541 995 }
Michael J. Spencer 1:f5ac63519541 996
Michael J. Spencer 1:f5ac63519541 997 /* packet given? */
Michael J. Spencer 1:f5ac63519541 998 LWIP_ASSERT("q != NULL", q != NULL);
Michael J. Spencer 1:f5ac63519541 999 /* stable entry? */
Michael J. Spencer 1:f5ac63519541 1000 if (arp_table[i].state == ETHARP_STATE_STABLE) {
Michael J. Spencer 1:f5ac63519541 1001 /* we have a valid IP->Ethernet address mapping */
Michael J. Spencer 1:f5ac63519541 1002 ETHARP_SET_HINT(netif, i);
Michael J. Spencer 1:f5ac63519541 1003 /* send the packet */
Michael J. Spencer 1:f5ac63519541 1004 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
Michael J. Spencer 1:f5ac63519541 1005 /* pending entry? (either just created or already pending */
Michael J. Spencer 1:f5ac63519541 1006 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
Michael J. Spencer 1:f5ac63519541 1007 #if ARP_QUEUEING /* queue the given q packet */
Michael J. Spencer 1:f5ac63519541 1008 struct pbuf *p;
Michael J. Spencer 1:f5ac63519541 1009 int copy_needed = 0;
Michael J. Spencer 1:f5ac63519541 1010 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
Michael J. Spencer 1:f5ac63519541 1011 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
Michael J. Spencer 1:f5ac63519541 1012 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
Michael J. Spencer 1:f5ac63519541 1013 p = q;
Michael J. Spencer 1:f5ac63519541 1014 while (p) {
Michael J. Spencer 1:f5ac63519541 1015 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
Michael J. Spencer 1:f5ac63519541 1016 if(p->type != PBUF_ROM) {
Michael J. Spencer 1:f5ac63519541 1017 copy_needed = 1;
Michael J. Spencer 1:f5ac63519541 1018 break;
Michael J. Spencer 1:f5ac63519541 1019 }
Michael J. Spencer 1:f5ac63519541 1020 p = p->next;
Michael J. Spencer 1:f5ac63519541 1021 }
Michael J. Spencer 1:f5ac63519541 1022 if(copy_needed) {
Michael J. Spencer 1:f5ac63519541 1023 /* copy the whole packet into new pbufs */
Michael J. Spencer 1:f5ac63519541 1024 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
Michael J. Spencer 1:f5ac63519541 1025 if(p != NULL) {
Michael J. Spencer 1:f5ac63519541 1026 if (pbuf_copy(p, q) != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1027 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1028 p = NULL;
Michael J. Spencer 1:f5ac63519541 1029 }
Michael J. Spencer 1:f5ac63519541 1030 }
Michael J. Spencer 1:f5ac63519541 1031 } else {
Michael J. Spencer 1:f5ac63519541 1032 /* referencing the old pbuf is enough */
Michael J. Spencer 1:f5ac63519541 1033 p = q;
Michael J. Spencer 1:f5ac63519541 1034 pbuf_ref(p);
Michael J. Spencer 1:f5ac63519541 1035 }
Michael J. Spencer 1:f5ac63519541 1036 /* packet could be taken over? */
Michael J. Spencer 1:f5ac63519541 1037 if (p != NULL) {
Michael J. Spencer 1:f5ac63519541 1038 /* queue packet ... */
Michael J. Spencer 1:f5ac63519541 1039 struct etharp_q_entry *new_entry;
Michael J. Spencer 1:f5ac63519541 1040 /* allocate a new arp queue entry */
Michael J. Spencer 1:f5ac63519541 1041 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
Michael J. Spencer 1:f5ac63519541 1042 if (new_entry != NULL) {
Michael J. Spencer 1:f5ac63519541 1043 new_entry->next = 0;
Michael J. Spencer 1:f5ac63519541 1044 new_entry->p = p;
Michael J. Spencer 1:f5ac63519541 1045 if(arp_table[i].q != NULL) {
Michael J. Spencer 1:f5ac63519541 1046 /* queue was already existent, append the new entry to the end */
Michael J. Spencer 1:f5ac63519541 1047 struct etharp_q_entry *r;
Michael J. Spencer 1:f5ac63519541 1048 r = arp_table[i].q;
Michael J. Spencer 1:f5ac63519541 1049 while (r->next != NULL) {
Michael J. Spencer 1:f5ac63519541 1050 r = r->next;
Michael J. Spencer 1:f5ac63519541 1051 }
Michael J. Spencer 1:f5ac63519541 1052 r->next = new_entry;
Michael J. Spencer 1:f5ac63519541 1053 } else {
Michael J. Spencer 1:f5ac63519541 1054 /* queue did not exist, first item in queue */
Michael J. Spencer 1:f5ac63519541 1055 arp_table[i].q = new_entry;
Michael J. Spencer 1:f5ac63519541 1056 }
Michael J. Spencer 1:f5ac63519541 1057 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
Michael J. Spencer 1:f5ac63519541 1058 result = ERR_OK;
Michael J. Spencer 1:f5ac63519541 1059 } else {
Michael J. Spencer 1:f5ac63519541 1060 /* the pool MEMP_ARP_QUEUE is empty */
Michael J. Spencer 1:f5ac63519541 1061 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1062 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));
Michael J. Spencer 1:f5ac63519541 1063 /* { result == ERR_MEM } through initialization */
Michael J. Spencer 1:f5ac63519541 1064 }
Michael J. Spencer 1:f5ac63519541 1065 } else {
Michael J. Spencer 1:f5ac63519541 1066 ETHARP_STATS_INC(etharp.memerr);
Michael J. Spencer 1:f5ac63519541 1067 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));
Michael J. Spencer 1:f5ac63519541 1068 /* { result == ERR_MEM } through initialization */
Michael J. Spencer 1:f5ac63519541 1069 }
Michael J. Spencer 1:f5ac63519541 1070 #else /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 1071 /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
Michael J. Spencer 1:f5ac63519541 1072 /* { result == ERR_MEM } through initialization */
Michael J. Spencer 1:f5ac63519541 1073 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
Michael J. Spencer 1:f5ac63519541 1074 #endif /* ARP_QUEUEING */
Michael J. Spencer 1:f5ac63519541 1075 }
Michael J. Spencer 1:f5ac63519541 1076 return result;
Michael J. Spencer 1:f5ac63519541 1077 }
Michael J. Spencer 1:f5ac63519541 1078
Michael J. Spencer 1:f5ac63519541 1079 /**
Michael J. Spencer 1:f5ac63519541 1080 * Send a raw ARP packet (opcode and all addresses can be modified)
Michael J. Spencer 1:f5ac63519541 1081 *
Michael J. Spencer 1:f5ac63519541 1082 * @param netif the lwip network interface on which to send the ARP packet
Michael J. Spencer 1:f5ac63519541 1083 * @param ethsrc_addr the source MAC address for the ethernet header
Michael J. Spencer 1:f5ac63519541 1084 * @param ethdst_addr the destination MAC address for the ethernet header
Michael J. Spencer 1:f5ac63519541 1085 * @param hwsrc_addr the source MAC address for the ARP protocol header
Michael J. Spencer 1:f5ac63519541 1086 * @param ipsrc_addr the source IP address for the ARP protocol header
Michael J. Spencer 1:f5ac63519541 1087 * @param hwdst_addr the destination MAC address for the ARP protocol header
Michael J. Spencer 1:f5ac63519541 1088 * @param ipdst_addr the destination IP address for the ARP protocol header
Michael J. Spencer 1:f5ac63519541 1089 * @param opcode the type of the ARP packet
Michael J. Spencer 1:f5ac63519541 1090 * @return ERR_OK if the ARP packet has been sent
Michael J. Spencer 1:f5ac63519541 1091 * ERR_MEM if the ARP packet couldn't be allocated
Michael J. Spencer 1:f5ac63519541 1092 * any other err_t on failure
Michael J. Spencer 1:f5ac63519541 1093 */
Michael J. Spencer 1:f5ac63519541 1094 #if !LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 1095 static
Michael J. Spencer 1:f5ac63519541 1096 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 1097 err_t
Michael J. Spencer 1:f5ac63519541 1098 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
Michael J. Spencer 1:f5ac63519541 1099 const struct eth_addr *ethdst_addr,
Michael J. Spencer 1:f5ac63519541 1100 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
Michael J. Spencer 1:f5ac63519541 1101 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
Michael J. Spencer 1:f5ac63519541 1102 const u16_t opcode)
Michael J. Spencer 1:f5ac63519541 1103 {
Michael J. Spencer 1:f5ac63519541 1104 struct pbuf *p;
Michael J. Spencer 1:f5ac63519541 1105 err_t result = ERR_OK;
Michael J. Spencer 1:f5ac63519541 1106 struct eth_hdr *ethhdr;
Michael J. Spencer 1:f5ac63519541 1107 struct etharp_hdr *hdr;
Michael J. Spencer 1:f5ac63519541 1108 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 1109 const u8_t * ethdst_hwaddr;
Michael J. Spencer 1:f5ac63519541 1110 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 1111
Michael J. Spencer 1:f5ac63519541 1112 /* allocate a pbuf for the outgoing ARP request packet */
Michael J. Spencer 1:f5ac63519541 1113 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
Michael J. Spencer 1:f5ac63519541 1114 /* could allocate a pbuf for an ARP request? */
Michael J. Spencer 1:f5ac63519541 1115 if (p == NULL) {
Michael J. Spencer 1:f5ac63519541 1116 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 1117 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
Michael J. Spencer 1:f5ac63519541 1118 ETHARP_STATS_INC(etharp.memerr);
Michael J. Spencer 1:f5ac63519541 1119 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 1120 }
Michael J. Spencer 1:f5ac63519541 1121 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
Michael J. Spencer 1:f5ac63519541 1122 (p->len >= SIZEOF_ETHARP_PACKET));
Michael J. Spencer 1:f5ac63519541 1123
Michael J. Spencer 1:f5ac63519541 1124 ethhdr = (struct eth_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 1125 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
Michael J. Spencer 1:f5ac63519541 1126 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
Michael J. Spencer 1:f5ac63519541 1127 hdr->opcode = htons(opcode);
Michael J. Spencer 1:f5ac63519541 1128
Michael J. Spencer 1:f5ac63519541 1129 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
Michael J. Spencer 1:f5ac63519541 1130 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
Michael J. Spencer 1:f5ac63519541 1131 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 1132 /* If we are using Link-Local, all ARP packets that contain a Link-Local
Michael J. Spencer 1:f5ac63519541 1133 * 'sender IP address' MUST be sent using link-layer broadcast instead of
Michael J. Spencer 1:f5ac63519541 1134 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
Michael J. Spencer 1:f5ac63519541 1135 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
Michael J. Spencer 1:f5ac63519541 1136 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 1137 /* Write the ARP MAC-Addresses */
Michael J. Spencer 1:f5ac63519541 1138 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
Michael J. Spencer 1:f5ac63519541 1139 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
Michael J. Spencer 1:f5ac63519541 1140 /* Write the Ethernet MAC-Addresses */
Michael J. Spencer 1:f5ac63519541 1141 #if LWIP_AUTOIP
Michael J. Spencer 1:f5ac63519541 1142 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
Michael J. Spencer 1:f5ac63519541 1143 #else /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 1144 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
Michael J. Spencer 1:f5ac63519541 1145 #endif /* LWIP_AUTOIP */
Michael J. Spencer 1:f5ac63519541 1146 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
Michael J. Spencer 1:f5ac63519541 1147 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
Michael J. Spencer 1:f5ac63519541 1148 * structure packing. */
Michael J. Spencer 1:f5ac63519541 1149 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
Michael J. Spencer 1:f5ac63519541 1150 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
Michael J. Spencer 1:f5ac63519541 1151
Michael J. Spencer 1:f5ac63519541 1152 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
Michael J. Spencer 1:f5ac63519541 1153 hdr->proto = PP_HTONS(ETHTYPE_IP);
Michael J. Spencer 1:f5ac63519541 1154 /* set hwlen and protolen */
Michael J. Spencer 1:f5ac63519541 1155 hdr->hwlen = ETHARP_HWADDR_LEN;
Michael J. Spencer 1:f5ac63519541 1156 hdr->protolen = sizeof(ip_addr_t);
Michael J. Spencer 1:f5ac63519541 1157
Michael J. Spencer 1:f5ac63519541 1158 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
Michael J. Spencer 1:f5ac63519541 1159 /* send ARP query */
Michael J. Spencer 1:f5ac63519541 1160 result = netif->linkoutput(netif, p);
Michael J. Spencer 1:f5ac63519541 1161 ETHARP_STATS_INC(etharp.xmit);
Michael J. Spencer 1:f5ac63519541 1162 /* free ARP query packet */
Michael J. Spencer 1:f5ac63519541 1163 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1164 p = NULL;
Michael J. Spencer 1:f5ac63519541 1165 /* could not allocate pbuf for ARP request */
Michael J. Spencer 1:f5ac63519541 1166
Michael J. Spencer 1:f5ac63519541 1167 return result;
Michael J. Spencer 1:f5ac63519541 1168 }
Michael J. Spencer 1:f5ac63519541 1169
Michael J. Spencer 1:f5ac63519541 1170 /**
Michael J. Spencer 1:f5ac63519541 1171 * Send an ARP request packet asking for ipaddr.
Michael J. Spencer 1:f5ac63519541 1172 *
Michael J. Spencer 1:f5ac63519541 1173 * @param netif the lwip network interface on which to send the request
Michael J. Spencer 1:f5ac63519541 1174 * @param ipaddr the IP address for which to ask
Michael J. Spencer 1:f5ac63519541 1175 * @return ERR_OK if the request has been sent
Michael J. Spencer 1:f5ac63519541 1176 * ERR_MEM if the ARP packet couldn't be allocated
Michael J. Spencer 1:f5ac63519541 1177 * any other err_t on failure
Michael J. Spencer 1:f5ac63519541 1178 */
Michael J. Spencer 1:f5ac63519541 1179 err_t
Michael J. Spencer 1:f5ac63519541 1180 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
Michael J. Spencer 1:f5ac63519541 1181 {
Michael J. Spencer 1:f5ac63519541 1182 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
Michael J. Spencer 1:f5ac63519541 1183 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
Michael J. Spencer 1:f5ac63519541 1184 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
Michael J. Spencer 1:f5ac63519541 1185 ipaddr, ARP_REQUEST);
Michael J. Spencer 1:f5ac63519541 1186 }
Michael J. Spencer 1:f5ac63519541 1187 #endif /* LWIP_ARP */
Michael J. Spencer 1:f5ac63519541 1188
Michael J. Spencer 1:f5ac63519541 1189 /**
Michael J. Spencer 1:f5ac63519541 1190 * Process received ethernet frames. Using this function instead of directly
Michael J. Spencer 1:f5ac63519541 1191 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
Michael J. Spencer 1:f5ac63519541 1192 * the ARP cache is protected from concurrent access.
Michael J. Spencer 1:f5ac63519541 1193 *
Michael J. Spencer 1:f5ac63519541 1194 * @param p the recevied packet, p->payload pointing to the ethernet header
Michael J. Spencer 1:f5ac63519541 1195 * @param netif the network interface on which the packet was received
Michael J. Spencer 1:f5ac63519541 1196 */
Michael J. Spencer 1:f5ac63519541 1197 err_t
Michael J. Spencer 1:f5ac63519541 1198 ethernet_input(struct pbuf *p, struct netif *netif)
Michael J. Spencer 1:f5ac63519541 1199 {
Michael J. Spencer 1:f5ac63519541 1200 struct eth_hdr* ethhdr;
Michael J. Spencer 1:f5ac63519541 1201 u16_t type;
Michael J. Spencer 1:f5ac63519541 1202
Michael J. Spencer 1:f5ac63519541 1203 /* points to packet payload, which starts with an Ethernet header */
Michael J. Spencer 1:f5ac63519541 1204 ethhdr = (struct eth_hdr *)p->payload;
Michael J. Spencer 1:f5ac63519541 1205 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
Michael J. Spencer 1:f5ac63519541 1206 ("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",
Michael J. Spencer 1:f5ac63519541 1207 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
Michael J. Spencer 1:f5ac63519541 1208 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
Michael J. Spencer 1:f5ac63519541 1209 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
Michael J. Spencer 1:f5ac63519541 1210 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
Michael J. Spencer 1:f5ac63519541 1211 (unsigned)htons(ethhdr->type)));
Michael J. Spencer 1:f5ac63519541 1212
Michael J. Spencer 1:f5ac63519541 1213 type = ethhdr->type;
Michael J. Spencer 1:f5ac63519541 1214 #if ETHARP_SUPPORT_VLAN
Michael J. Spencer 1:f5ac63519541 1215 if (type == PP_HTONS(ETHTYPE_VLAN)) {
Michael J. Spencer 1:f5ac63519541 1216 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
Michael J. Spencer 1:f5ac63519541 1217 #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
Michael J. Spencer 1:f5ac63519541 1218 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
Michael J. Spencer 1:f5ac63519541 1219 /* silently ignore this packet: not for our VLAN */
Michael J. Spencer 1:f5ac63519541 1220 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1221 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 1222 }
Michael J. Spencer 1:f5ac63519541 1223 #endif /* ETHARP_VLAN_CHECK */
Michael J. Spencer 1:f5ac63519541 1224 type = vlan->tpid;
Michael J. Spencer 1:f5ac63519541 1225 }
Michael J. Spencer 1:f5ac63519541 1226 #endif /* ETHARP_SUPPORT_VLAN */
Michael J. Spencer 1:f5ac63519541 1227
Michael J. Spencer 1:f5ac63519541 1228 #if LWIP_ARP_FILTER_NETIF
Michael J. Spencer 1:f5ac63519541 1229 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
Michael J. Spencer 1:f5ac63519541 1230 #endif /* LWIP_ARP_FILTER_NETIF*/
Michael J. Spencer 1:f5ac63519541 1231
Michael J. Spencer 1:f5ac63519541 1232 switch (type) {
Michael J. Spencer 1:f5ac63519541 1233 #if LWIP_ARP
Michael J. Spencer 1:f5ac63519541 1234 /* IP packet? */
Michael J. Spencer 1:f5ac63519541 1235 case PP_HTONS(ETHTYPE_IP):
Michael J. Spencer 1:f5ac63519541 1236 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
Michael J. Spencer 1:f5ac63519541 1237 goto free_and_return;
Michael J. Spencer 1:f5ac63519541 1238 }
Michael J. Spencer 1:f5ac63519541 1239 #if ETHARP_TRUST_IP_MAC
Michael J. Spencer 1:f5ac63519541 1240 /* update ARP table */
Michael J. Spencer 1:f5ac63519541 1241 etharp_ip_input(netif, p);
Michael J. Spencer 1:f5ac63519541 1242 #endif /* ETHARP_TRUST_IP_MAC */
Michael J. Spencer 1:f5ac63519541 1243 /* skip Ethernet header */
Michael J. Spencer 1:f5ac63519541 1244 if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
Michael J. Spencer 1:f5ac63519541 1245 LWIP_ASSERT("Can't move over header in packet", 0);
Michael J. Spencer 1:f5ac63519541 1246 goto free_and_return;
Michael J. Spencer 1:f5ac63519541 1247 } else {
Michael J. Spencer 1:f5ac63519541 1248 /* pass to IP layer */
Michael J. Spencer 1:f5ac63519541 1249 ip_input(p, netif);
Michael J. Spencer 1:f5ac63519541 1250 }
Michael J. Spencer 1:f5ac63519541 1251 break;
Michael J. Spencer 1:f5ac63519541 1252
Michael J. Spencer 1:f5ac63519541 1253 case PP_HTONS(ETHTYPE_ARP):
Michael J. Spencer 1:f5ac63519541 1254 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
Michael J. Spencer 1:f5ac63519541 1255 goto free_and_return;
Michael J. Spencer 1:f5ac63519541 1256 }
Michael J. Spencer 1:f5ac63519541 1257 /* pass p to ARP module */
Michael J. Spencer 1:f5ac63519541 1258 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
Michael J. Spencer 1:f5ac63519541 1259 break;
Michael J. Spencer 1:f5ac63519541 1260 #endif /* LWIP_ARP */
Michael J. Spencer 1:f5ac63519541 1261 #if PPPOE_SUPPORT
Michael J. Spencer 1:f5ac63519541 1262 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
Michael J. Spencer 1:f5ac63519541 1263 pppoe_disc_input(netif, p);
Michael J. Spencer 1:f5ac63519541 1264 break;
Michael J. Spencer 1:f5ac63519541 1265
Michael J. Spencer 1:f5ac63519541 1266 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
Michael J. Spencer 1:f5ac63519541 1267 pppoe_data_input(netif, p);
Michael J. Spencer 1:f5ac63519541 1268 break;
Michael J. Spencer 1:f5ac63519541 1269 #endif /* PPPOE_SUPPORT */
Michael J. Spencer 1:f5ac63519541 1270
Michael J. Spencer 1:f5ac63519541 1271 default:
Michael J. Spencer 1:f5ac63519541 1272 ETHARP_STATS_INC(etharp.proterr);
Michael J. Spencer 1:f5ac63519541 1273 ETHARP_STATS_INC(etharp.drop);
Michael J. Spencer 1:f5ac63519541 1274 goto free_and_return;
Michael J. Spencer 1:f5ac63519541 1275 }
Michael J. Spencer 1:f5ac63519541 1276
Michael J. Spencer 1:f5ac63519541 1277 /* This means the pbuf is freed or consumed,
Michael J. Spencer 1:f5ac63519541 1278 so the caller doesn't have to free it again */
Michael J. Spencer 1:f5ac63519541 1279 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 1280
Michael J. Spencer 1:f5ac63519541 1281 free_and_return:
Michael J. Spencer 1:f5ac63519541 1282 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1283 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 1284 }
Michael J. Spencer 1:f5ac63519541 1285 #endif /* LWIP_ARP || LWIP_ETHERNET */