Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/netif/etharp.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 /**
ninoderkinderen 0:8d87bc453349 2 * @file
ninoderkinderen 0:8d87bc453349 3 * Address Resolution Protocol module for IP over Ethernet
ninoderkinderen 0:8d87bc453349 4 *
ninoderkinderen 0:8d87bc453349 5 * Functionally, ARP is divided into two parts. The first maps an IP address
ninoderkinderen 0:8d87bc453349 6 * to a physical address when sending a packet, and the second part answers
ninoderkinderen 0:8d87bc453349 7 * requests from other machines for our physical address.
ninoderkinderen 0:8d87bc453349 8 *
ninoderkinderen 0:8d87bc453349 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
ninoderkinderen 0:8d87bc453349 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
ninoderkinderen 0:8d87bc453349 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
ninoderkinderen 0:8d87bc453349 12 */
ninoderkinderen 0:8d87bc453349 13
ninoderkinderen 0:8d87bc453349 14 /*
ninoderkinderen 0:8d87bc453349 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
ninoderkinderen 0:8d87bc453349 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
ninoderkinderen 0:8d87bc453349 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
ninoderkinderen 0:8d87bc453349 18 * All rights reserved.
ninoderkinderen 0:8d87bc453349 19 *
ninoderkinderen 0:8d87bc453349 20 * Redistribution and use in source and binary forms, with or without modification,
ninoderkinderen 0:8d87bc453349 21 * are permitted provided that the following conditions are met:
ninoderkinderen 0:8d87bc453349 22 *
ninoderkinderen 0:8d87bc453349 23 * 1. Redistributions of source code must retain the above copyright notice,
ninoderkinderen 0:8d87bc453349 24 * this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
ninoderkinderen 0:8d87bc453349 26 * this list of conditions and the following disclaimer in the documentation
ninoderkinderen 0:8d87bc453349 27 * and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 28 * 3. The name of the author may not be used to endorse or promote products
ninoderkinderen 0:8d87bc453349 29 * derived from this software without specific prior written permission.
ninoderkinderen 0:8d87bc453349 30 *
ninoderkinderen 0:8d87bc453349 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ninoderkinderen 0:8d87bc453349 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ninoderkinderen 0:8d87bc453349 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ninoderkinderen 0:8d87bc453349 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ninoderkinderen 0:8d87bc453349 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ninoderkinderen 0:8d87bc453349 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ninoderkinderen 0:8d87bc453349 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ninoderkinderen 0:8d87bc453349 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ninoderkinderen 0:8d87bc453349 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ninoderkinderen 0:8d87bc453349 40 * OF SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 41 *
ninoderkinderen 0:8d87bc453349 42 * This file is part of the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 43 *
ninoderkinderen 0:8d87bc453349 44 */
ninoderkinderen 0:8d87bc453349 45
ninoderkinderen 0:8d87bc453349 46 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 47
ninoderkinderen 0:8d87bc453349 48 #if LWIP_ARP || LWIP_ETHERNET
ninoderkinderen 0:8d87bc453349 49
ninoderkinderen 0:8d87bc453349 50 #include "lwip/ip_addr.h"
ninoderkinderen 0:8d87bc453349 51 #include "lwip/def.h"
ninoderkinderen 0:8d87bc453349 52 #include "lwip/ip.h"
ninoderkinderen 0:8d87bc453349 53 #include "lwip/stats.h"
ninoderkinderen 0:8d87bc453349 54 #include "lwip/snmp.h"
ninoderkinderen 0:8d87bc453349 55 #include "lwip/dhcp.h"
ninoderkinderen 0:8d87bc453349 56 #include "lwip/autoip.h"
ninoderkinderen 0:8d87bc453349 57 #include "netif/etharp.h"
ninoderkinderen 0:8d87bc453349 58
ninoderkinderen 0:8d87bc453349 59 #if PPPOE_SUPPORT
ninoderkinderen 0:8d87bc453349 60 #include "netif/ppp_oe.h"
ninoderkinderen 0:8d87bc453349 61 #endif /* PPPOE_SUPPORT */
ninoderkinderen 0:8d87bc453349 62
ninoderkinderen 0:8d87bc453349 63 #include <string.h>
ninoderkinderen 0:8d87bc453349 64
ninoderkinderen 0:8d87bc453349 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
ninoderkinderen 0:8d87bc453349 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
ninoderkinderen 0:8d87bc453349 67
ninoderkinderen 0:8d87bc453349 68 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
ninoderkinderen 0:8d87bc453349 69
ninoderkinderen 0:8d87bc453349 70 /** the time an ARP entry stays valid after its last update,
ninoderkinderen 0:8d87bc453349 71 * for ARP_TMR_INTERVAL = 5000, this is
ninoderkinderen 0:8d87bc453349 72 * (240 * 5) seconds = 20 minutes.
ninoderkinderen 0:8d87bc453349 73 */
ninoderkinderen 0:8d87bc453349 74 #define ARP_MAXAGE 240
ninoderkinderen 0:8d87bc453349 75 /** the time an ARP entry stays pending after first request,
ninoderkinderen 0:8d87bc453349 76 * for ARP_TMR_INTERVAL = 5000, this is
ninoderkinderen 0:8d87bc453349 77 * (2 * 5) seconds = 10 seconds.
ninoderkinderen 0:8d87bc453349 78 *
ninoderkinderen 0:8d87bc453349 79 * @internal Keep this number at least 2, otherwise it might
ninoderkinderen 0:8d87bc453349 80 * run out instantly if the timeout occurs directly after a request.
ninoderkinderen 0:8d87bc453349 81 */
ninoderkinderen 0:8d87bc453349 82 #define ARP_MAXPENDING 2
ninoderkinderen 0:8d87bc453349 83
ninoderkinderen 0:8d87bc453349 84 #define HWTYPE_ETHERNET 1
ninoderkinderen 0:8d87bc453349 85
ninoderkinderen 0:8d87bc453349 86 enum etharp_state {
ninoderkinderen 0:8d87bc453349 87 ETHARP_STATE_EMPTY = 0,
ninoderkinderen 0:8d87bc453349 88 ETHARP_STATE_PENDING,
ninoderkinderen 0:8d87bc453349 89 ETHARP_STATE_STABLE
ninoderkinderen 0:8d87bc453349 90 };
ninoderkinderen 0:8d87bc453349 91
ninoderkinderen 0:8d87bc453349 92 struct etharp_entry {
ninoderkinderen 0:8d87bc453349 93 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 94 /** Pointer to queue of pending outgoing packets on this ARP entry. */
ninoderkinderen 0:8d87bc453349 95 struct etharp_q_entry *q;
ninoderkinderen 0:8d87bc453349 96 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 97 ip_addr_t ipaddr;
ninoderkinderen 0:8d87bc453349 98 struct eth_addr ethaddr;
ninoderkinderen 0:8d87bc453349 99 #if LWIP_SNMP
ninoderkinderen 0:8d87bc453349 100 struct netif *netif;
ninoderkinderen 0:8d87bc453349 101 #endif /* LWIP_SNMP */
ninoderkinderen 0:8d87bc453349 102 u8_t state;
ninoderkinderen 0:8d87bc453349 103 u8_t ctime;
ninoderkinderen 0:8d87bc453349 104 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 105 u8_t static_entry;
ninoderkinderen 0:8d87bc453349 106 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 107 };
ninoderkinderen 0:8d87bc453349 108
ninoderkinderen 0:8d87bc453349 109 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
ninoderkinderen 0:8d87bc453349 110
ninoderkinderen 0:8d87bc453349 111 #if !LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 112 static u8_t etharp_cached_entry;
ninoderkinderen 0:8d87bc453349 113 #endif /* !LWIP_NETIF_HWADDRHINT */
ninoderkinderen 0:8d87bc453349 114
ninoderkinderen 0:8d87bc453349 115 /** Try hard to create a new entry - we want the IP address to appear in
ninoderkinderen 0:8d87bc453349 116 the cache (even if this means removing an active entry or so). */
ninoderkinderen 0:8d87bc453349 117 #define ETHARP_FLAG_TRY_HARD 1
ninoderkinderen 0:8d87bc453349 118 #define ETHARP_FLAG_FIND_ONLY 2
ninoderkinderen 0:8d87bc453349 119 #define ETHARP_FLAG_STATIC_ENTRY 4
ninoderkinderen 0:8d87bc453349 120
ninoderkinderen 0:8d87bc453349 121 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 122 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
ninoderkinderen 0:8d87bc453349 123 *((netif)->addr_hint) = (hint);
ninoderkinderen 0:8d87bc453349 124 #else /* LWIP_NETIF_HWADDRHINT */
ninoderkinderen 0:8d87bc453349 125 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
ninoderkinderen 0:8d87bc453349 126 #endif /* LWIP_NETIF_HWADDRHINT */
ninoderkinderen 0:8d87bc453349 127
ninoderkinderen 0:8d87bc453349 128 static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags);
ninoderkinderen 0:8d87bc453349 129
ninoderkinderen 0:8d87bc453349 130
ninoderkinderen 0:8d87bc453349 131 /* Some checks, instead of etharp_init(): */
ninoderkinderen 0:8d87bc453349 132 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
ninoderkinderen 0:8d87bc453349 133 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
ninoderkinderen 0:8d87bc453349 134 #endif
ninoderkinderen 0:8d87bc453349 135
ninoderkinderen 0:8d87bc453349 136
ninoderkinderen 0:8d87bc453349 137 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 138 /**
ninoderkinderen 0:8d87bc453349 139 * Free a complete queue of etharp entries
ninoderkinderen 0:8d87bc453349 140 *
ninoderkinderen 0:8d87bc453349 141 * @param q a qeueue of etharp_q_entry's to free
ninoderkinderen 0:8d87bc453349 142 */
ninoderkinderen 0:8d87bc453349 143 static void
ninoderkinderen 0:8d87bc453349 144 free_etharp_q(struct etharp_q_entry *q)
ninoderkinderen 0:8d87bc453349 145 {
ninoderkinderen 0:8d87bc453349 146 struct etharp_q_entry *r;
ninoderkinderen 0:8d87bc453349 147 LWIP_ASSERT("q != NULL", q != NULL);
ninoderkinderen 0:8d87bc453349 148 LWIP_ASSERT("q->p != NULL", q->p != NULL);
ninoderkinderen 0:8d87bc453349 149 while (q) {
ninoderkinderen 0:8d87bc453349 150 r = q;
ninoderkinderen 0:8d87bc453349 151 q = q->next;
ninoderkinderen 0:8d87bc453349 152 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
ninoderkinderen 0:8d87bc453349 153 pbuf_free(r->p);
ninoderkinderen 0:8d87bc453349 154 memp_free(MEMP_ARP_QUEUE, r);
ninoderkinderen 0:8d87bc453349 155 }
ninoderkinderen 0:8d87bc453349 156 }
ninoderkinderen 0:8d87bc453349 157 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 158
ninoderkinderen 0:8d87bc453349 159 /** Clean up ARP table entries */
ninoderkinderen 0:8d87bc453349 160 static void
ninoderkinderen 0:8d87bc453349 161 free_entry(int i)
ninoderkinderen 0:8d87bc453349 162 {
ninoderkinderen 0:8d87bc453349 163 /* remove from SNMP ARP index tree */
ninoderkinderen 0:8d87bc453349 164 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
ninoderkinderen 0:8d87bc453349 165 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 166 /* and empty packet queue */
ninoderkinderen 0:8d87bc453349 167 if (arp_table[i].q != NULL) {
ninoderkinderen 0:8d87bc453349 168 /* remove all queued packets */
ninoderkinderen 0:8d87bc453349 169 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
ninoderkinderen 0:8d87bc453349 170 free_etharp_q(arp_table[i].q);
ninoderkinderen 0:8d87bc453349 171 arp_table[i].q = NULL;
ninoderkinderen 0:8d87bc453349 172 }
ninoderkinderen 0:8d87bc453349 173 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 174 /* recycle entry for re-use */
ninoderkinderen 0:8d87bc453349 175 arp_table[i].state = ETHARP_STATE_EMPTY;
ninoderkinderen 0:8d87bc453349 176 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 177 arp_table[i].static_entry = 0;
ninoderkinderen 0:8d87bc453349 178 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 179 #ifdef LWIP_DEBUG
ninoderkinderen 0:8d87bc453349 180 /* for debugging, clean out the complete entry */
ninoderkinderen 0:8d87bc453349 181 arp_table[i].ctime = 0;
ninoderkinderen 0:8d87bc453349 182 #if LWIP_SNMP
ninoderkinderen 0:8d87bc453349 183 arp_table[i].netif = NULL;
ninoderkinderen 0:8d87bc453349 184 #endif /* LWIP_SNMP */
ninoderkinderen 0:8d87bc453349 185 ip_addr_set_zero(&arp_table[i].ipaddr);
ninoderkinderen 0:8d87bc453349 186 arp_table[i].ethaddr = ethzero;
ninoderkinderen 0:8d87bc453349 187 #endif /* LWIP_DEBUG */
ninoderkinderen 0:8d87bc453349 188 }
ninoderkinderen 0:8d87bc453349 189
ninoderkinderen 0:8d87bc453349 190 /**
ninoderkinderen 0:8d87bc453349 191 * Clears expired entries in the ARP table.
ninoderkinderen 0:8d87bc453349 192 *
ninoderkinderen 0:8d87bc453349 193 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
ninoderkinderen 0:8d87bc453349 194 * in order to expire entries in the ARP table.
ninoderkinderen 0:8d87bc453349 195 */
ninoderkinderen 0:8d87bc453349 196 void
ninoderkinderen 0:8d87bc453349 197 etharp_tmr(void)
ninoderkinderen 0:8d87bc453349 198 {
ninoderkinderen 0:8d87bc453349 199 u8_t i;
ninoderkinderen 0:8d87bc453349 200
ninoderkinderen 0:8d87bc453349 201 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
ninoderkinderen 0:8d87bc453349 202 /* remove expired entries from the ARP table */
ninoderkinderen 0:8d87bc453349 203 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
ninoderkinderen 0:8d87bc453349 204 u8_t state = arp_table[i].state;
ninoderkinderen 0:8d87bc453349 205 if (state != ETHARP_STATE_EMPTY
ninoderkinderen 0:8d87bc453349 206 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 207 && (arp_table[i].static_entry == 0)
ninoderkinderen 0:8d87bc453349 208 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 209 ) {
ninoderkinderen 0:8d87bc453349 210 arp_table[i].ctime++;
ninoderkinderen 0:8d87bc453349 211 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
ninoderkinderen 0:8d87bc453349 212 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
ninoderkinderen 0:8d87bc453349 213 (arp_table[i].ctime >= ARP_MAXPENDING))) {
ninoderkinderen 0:8d87bc453349 214 /* pending or stable entry has become old! */
ninoderkinderen 0:8d87bc453349 215 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
ninoderkinderen 0:8d87bc453349 216 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
ninoderkinderen 0:8d87bc453349 217 /* clean up entries that have just been expired */
ninoderkinderen 0:8d87bc453349 218 free_entry(i);
ninoderkinderen 0:8d87bc453349 219 }
ninoderkinderen 0:8d87bc453349 220 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 221 /* still pending entry? (not expired) */
ninoderkinderen 0:8d87bc453349 222 if (arp_table[i].state == ETHARP_STATE_PENDING) {
ninoderkinderen 0:8d87bc453349 223 /* resend an ARP query here? */
ninoderkinderen 0:8d87bc453349 224 }
ninoderkinderen 0:8d87bc453349 225 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 226 }
ninoderkinderen 0:8d87bc453349 227 }
ninoderkinderen 0:8d87bc453349 228 }
ninoderkinderen 0:8d87bc453349 229
ninoderkinderen 0:8d87bc453349 230 /**
ninoderkinderen 0:8d87bc453349 231 * Search the ARP table for a matching or new entry.
ninoderkinderen 0:8d87bc453349 232 *
ninoderkinderen 0:8d87bc453349 233 * If an IP address is given, return a pending or stable ARP entry that matches
ninoderkinderen 0:8d87bc453349 234 * the address. If no match is found, create a new entry with this address set,
ninoderkinderen 0:8d87bc453349 235 * but in state ETHARP_EMPTY. The caller must check and possibly change the
ninoderkinderen 0:8d87bc453349 236 * state of the returned entry.
ninoderkinderen 0:8d87bc453349 237 *
ninoderkinderen 0:8d87bc453349 238 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
ninoderkinderen 0:8d87bc453349 239 *
ninoderkinderen 0:8d87bc453349 240 * In all cases, attempt to create new entries from an empty entry. If no
ninoderkinderen 0:8d87bc453349 241 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
ninoderkinderen 0:8d87bc453349 242 * old entries. Heuristic choose the least important entry for recycling.
ninoderkinderen 0:8d87bc453349 243 *
ninoderkinderen 0:8d87bc453349 244 * @param ipaddr IP address to find in ARP cache, or to add if not found.
ninoderkinderen 0:8d87bc453349 245 * @param flags @see definition of ETHARP_FLAG_*
ninoderkinderen 0:8d87bc453349 246 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
ninoderkinderen 0:8d87bc453349 247 *
ninoderkinderen 0:8d87bc453349 248 * @return The ARP entry index that matched or is created, ERR_MEM if no
ninoderkinderen 0:8d87bc453349 249 * entry is found or could be recycled.
ninoderkinderen 0:8d87bc453349 250 */
ninoderkinderen 0:8d87bc453349 251 static s8_t
ninoderkinderen 0:8d87bc453349 252 find_entry(ip_addr_t *ipaddr, u8_t flags)
ninoderkinderen 0:8d87bc453349 253 {
ninoderkinderen 0:8d87bc453349 254 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
ninoderkinderen 0:8d87bc453349 255 s8_t empty = ARP_TABLE_SIZE;
ninoderkinderen 0:8d87bc453349 256 u8_t i = 0, age_pending = 0, age_stable = 0;
ninoderkinderen 0:8d87bc453349 257 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 258 /* oldest entry with packets on queue */
ninoderkinderen 0:8d87bc453349 259 s8_t old_queue = ARP_TABLE_SIZE;
ninoderkinderen 0:8d87bc453349 260 /* its age */
ninoderkinderen 0:8d87bc453349 261 u8_t age_queue = 0;
ninoderkinderen 0:8d87bc453349 262 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 263
ninoderkinderen 0:8d87bc453349 264 /**
ninoderkinderen 0:8d87bc453349 265 * a) do a search through the cache, remember candidates
ninoderkinderen 0:8d87bc453349 266 * b) select candidate entry
ninoderkinderen 0:8d87bc453349 267 * c) create new entry
ninoderkinderen 0:8d87bc453349 268 */
ninoderkinderen 0:8d87bc453349 269
ninoderkinderen 0:8d87bc453349 270 /* a) in a single search sweep, do all of this
ninoderkinderen 0:8d87bc453349 271 * 1) remember the first empty entry (if any)
ninoderkinderen 0:8d87bc453349 272 * 2) remember the oldest stable entry (if any)
ninoderkinderen 0:8d87bc453349 273 * 3) remember the oldest pending entry without queued packets (if any)
ninoderkinderen 0:8d87bc453349 274 * 4) remember the oldest pending entry with queued packets (if any)
ninoderkinderen 0:8d87bc453349 275 * 5) search for a matching IP entry, either pending or stable
ninoderkinderen 0:8d87bc453349 276 * until 5 matches, or all entries are searched for.
ninoderkinderen 0:8d87bc453349 277 */
ninoderkinderen 0:8d87bc453349 278
ninoderkinderen 0:8d87bc453349 279 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
ninoderkinderen 0:8d87bc453349 280 u8_t state = arp_table[i].state;
ninoderkinderen 0:8d87bc453349 281 /* no empty entry found yet and now we do find one? */
ninoderkinderen 0:8d87bc453349 282 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
ninoderkinderen 0:8d87bc453349 283 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
ninoderkinderen 0:8d87bc453349 284 /* remember first empty entry */
ninoderkinderen 0:8d87bc453349 285 empty = i;
ninoderkinderen 0:8d87bc453349 286 } else if (state != ETHARP_STATE_EMPTY) {
ninoderkinderen 0:8d87bc453349 287 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE",
ninoderkinderen 0:8d87bc453349 288 state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE);
ninoderkinderen 0:8d87bc453349 289 /* if given, does IP address match IP address in ARP entry? */
ninoderkinderen 0:8d87bc453349 290 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
ninoderkinderen 0:8d87bc453349 291 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
ninoderkinderen 0:8d87bc453349 292 /* found exact IP address match, simply bail out */
ninoderkinderen 0:8d87bc453349 293 return i;
ninoderkinderen 0:8d87bc453349 294 }
ninoderkinderen 0:8d87bc453349 295 /* pending entry? */
ninoderkinderen 0:8d87bc453349 296 if (state == ETHARP_STATE_PENDING) {
ninoderkinderen 0:8d87bc453349 297 /* pending with queued packets? */
ninoderkinderen 0:8d87bc453349 298 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 299 if (arp_table[i].q != NULL) {
ninoderkinderen 0:8d87bc453349 300 if (arp_table[i].ctime >= age_queue) {
ninoderkinderen 0:8d87bc453349 301 old_queue = i;
ninoderkinderen 0:8d87bc453349 302 age_queue = arp_table[i].ctime;
ninoderkinderen 0:8d87bc453349 303 }
ninoderkinderen 0:8d87bc453349 304 } else
ninoderkinderen 0:8d87bc453349 305 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 306 /* pending without queued packets? */
ninoderkinderen 0:8d87bc453349 307 {
ninoderkinderen 0:8d87bc453349 308 if (arp_table[i].ctime >= age_pending) {
ninoderkinderen 0:8d87bc453349 309 old_pending = i;
ninoderkinderen 0:8d87bc453349 310 age_pending = arp_table[i].ctime;
ninoderkinderen 0:8d87bc453349 311 }
ninoderkinderen 0:8d87bc453349 312 }
ninoderkinderen 0:8d87bc453349 313 /* stable entry? */
ninoderkinderen 0:8d87bc453349 314 } else if (state == ETHARP_STATE_STABLE) {
ninoderkinderen 0:8d87bc453349 315 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 316 /* don't record old_stable for static entries since they never expire */
ninoderkinderen 0:8d87bc453349 317 if (arp_table[i].static_entry == 0)
ninoderkinderen 0:8d87bc453349 318 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 319 {
ninoderkinderen 0:8d87bc453349 320 /* remember entry with oldest stable entry in oldest, its age in maxtime */
ninoderkinderen 0:8d87bc453349 321 if (arp_table[i].ctime >= age_stable) {
ninoderkinderen 0:8d87bc453349 322 old_stable = i;
ninoderkinderen 0:8d87bc453349 323 age_stable = arp_table[i].ctime;
ninoderkinderen 0:8d87bc453349 324 }
ninoderkinderen 0:8d87bc453349 325 }
ninoderkinderen 0:8d87bc453349 326 }
ninoderkinderen 0:8d87bc453349 327 }
ninoderkinderen 0:8d87bc453349 328 }
ninoderkinderen 0:8d87bc453349 329 /* { we have no match } => try to create a new entry */
ninoderkinderen 0:8d87bc453349 330
ninoderkinderen 0:8d87bc453349 331 /* don't create new entry, only search? */
ninoderkinderen 0:8d87bc453349 332 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
ninoderkinderen 0:8d87bc453349 333 /* or no empty entry found and not allowed to recycle? */
ninoderkinderen 0:8d87bc453349 334 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
ninoderkinderen 0:8d87bc453349 335 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
ninoderkinderen 0:8d87bc453349 336 return (s8_t)ERR_MEM;
ninoderkinderen 0:8d87bc453349 337 }
ninoderkinderen 0:8d87bc453349 338
ninoderkinderen 0:8d87bc453349 339 /* b) choose the least destructive entry to recycle:
ninoderkinderen 0:8d87bc453349 340 * 1) empty entry
ninoderkinderen 0:8d87bc453349 341 * 2) oldest stable entry
ninoderkinderen 0:8d87bc453349 342 * 3) oldest pending entry without queued packets
ninoderkinderen 0:8d87bc453349 343 * 4) oldest pending entry with queued packets
ninoderkinderen 0:8d87bc453349 344 *
ninoderkinderen 0:8d87bc453349 345 * { ETHARP_FLAG_TRY_HARD is set at this point }
ninoderkinderen 0:8d87bc453349 346 */
ninoderkinderen 0:8d87bc453349 347
ninoderkinderen 0:8d87bc453349 348 /* 1) empty entry available? */
ninoderkinderen 0:8d87bc453349 349 if (empty < ARP_TABLE_SIZE) {
ninoderkinderen 0:8d87bc453349 350 i = empty;
ninoderkinderen 0:8d87bc453349 351 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
ninoderkinderen 0:8d87bc453349 352 } else {
ninoderkinderen 0:8d87bc453349 353 /* 2) found recyclable stable entry? */
ninoderkinderen 0:8d87bc453349 354 if (old_stable < ARP_TABLE_SIZE) {
ninoderkinderen 0:8d87bc453349 355 /* recycle oldest stable*/
ninoderkinderen 0:8d87bc453349 356 i = old_stable;
ninoderkinderen 0:8d87bc453349 357 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
ninoderkinderen 0:8d87bc453349 358 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 359 /* no queued packets should exist on stable entries */
ninoderkinderen 0:8d87bc453349 360 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
ninoderkinderen 0:8d87bc453349 361 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 362 /* 3) found recyclable pending entry without queued packets? */
ninoderkinderen 0:8d87bc453349 363 } else if (old_pending < ARP_TABLE_SIZE) {
ninoderkinderen 0:8d87bc453349 364 /* recycle oldest pending */
ninoderkinderen 0:8d87bc453349 365 i = old_pending;
ninoderkinderen 0:8d87bc453349 366 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
ninoderkinderen 0:8d87bc453349 367 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 368 /* 4) found recyclable pending entry with queued packets? */
ninoderkinderen 0:8d87bc453349 369 } else if (old_queue < ARP_TABLE_SIZE) {
ninoderkinderen 0:8d87bc453349 370 /* recycle oldest pending (queued packets are free in free_entry) */
ninoderkinderen 0:8d87bc453349 371 i = old_queue;
ninoderkinderen 0:8d87bc453349 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)));
ninoderkinderen 0:8d87bc453349 373 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 374 /* no empty or recyclable entries found */
ninoderkinderen 0:8d87bc453349 375 } else {
ninoderkinderen 0:8d87bc453349 376 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
ninoderkinderen 0:8d87bc453349 377 return (s8_t)ERR_MEM;
ninoderkinderen 0:8d87bc453349 378 }
ninoderkinderen 0:8d87bc453349 379
ninoderkinderen 0:8d87bc453349 380 /* { empty or recyclable entry found } */
ninoderkinderen 0:8d87bc453349 381 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
ninoderkinderen 0:8d87bc453349 382 free_entry(i);
ninoderkinderen 0:8d87bc453349 383 }
ninoderkinderen 0:8d87bc453349 384
ninoderkinderen 0:8d87bc453349 385 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
ninoderkinderen 0:8d87bc453349 386 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
ninoderkinderen 0:8d87bc453349 387 arp_table[i].state == ETHARP_STATE_EMPTY);
ninoderkinderen 0:8d87bc453349 388
ninoderkinderen 0:8d87bc453349 389 /* IP address given? */
ninoderkinderen 0:8d87bc453349 390 if (ipaddr != NULL) {
ninoderkinderen 0:8d87bc453349 391 /* set IP address */
ninoderkinderen 0:8d87bc453349 392 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
ninoderkinderen 0:8d87bc453349 393 }
ninoderkinderen 0:8d87bc453349 394 arp_table[i].ctime = 0;
ninoderkinderen 0:8d87bc453349 395 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 396 arp_table[i].static_entry = 0;
ninoderkinderen 0:8d87bc453349 397 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 398 return (err_t)i;
ninoderkinderen 0:8d87bc453349 399 }
ninoderkinderen 0:8d87bc453349 400
ninoderkinderen 0:8d87bc453349 401 /**
ninoderkinderen 0:8d87bc453349 402 * Send an IP packet on the network using netif->linkoutput
ninoderkinderen 0:8d87bc453349 403 * The ethernet header is filled in before sending.
ninoderkinderen 0:8d87bc453349 404 *
ninoderkinderen 0:8d87bc453349 405 * @params netif the lwIP network interface on which to send the packet
ninoderkinderen 0:8d87bc453349 406 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
ninoderkinderen 0:8d87bc453349 407 * @params src the source MAC address to be copied into the ethernet header
ninoderkinderen 0:8d87bc453349 408 * @params dst the destination MAC address to be copied into the ethernet header
ninoderkinderen 0:8d87bc453349 409 * @return ERR_OK if the packet was sent, any other err_t on failure
ninoderkinderen 0:8d87bc453349 410 */
ninoderkinderen 0:8d87bc453349 411 static err_t
ninoderkinderen 0:8d87bc453349 412 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
ninoderkinderen 0:8d87bc453349 413 {
ninoderkinderen 0:8d87bc453349 414 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 415
ninoderkinderen 0:8d87bc453349 416 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
ninoderkinderen 0:8d87bc453349 417 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
ninoderkinderen 0:8d87bc453349 418 ETHADDR32_COPY(&ethhdr->dest, dst);
ninoderkinderen 0:8d87bc453349 419 ETHADDR16_COPY(&ethhdr->src, src);
ninoderkinderen 0:8d87bc453349 420 ethhdr->type = PP_HTONS(ETHTYPE_IP);
ninoderkinderen 0:8d87bc453349 421 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
ninoderkinderen 0:8d87bc453349 422 /* send the packet */
ninoderkinderen 0:8d87bc453349 423 return netif->linkoutput(netif, p);
ninoderkinderen 0:8d87bc453349 424 }
ninoderkinderen 0:8d87bc453349 425
ninoderkinderen 0:8d87bc453349 426 /**
ninoderkinderen 0:8d87bc453349 427 * Update (or insert) a IP/MAC address pair in the ARP cache.
ninoderkinderen 0:8d87bc453349 428 *
ninoderkinderen 0:8d87bc453349 429 * If a pending entry is resolved, any queued packets will be sent
ninoderkinderen 0:8d87bc453349 430 * at this point.
ninoderkinderen 0:8d87bc453349 431 *
ninoderkinderen 0:8d87bc453349 432 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
ninoderkinderen 0:8d87bc453349 433 * @param ipaddr IP address of the inserted ARP entry.
ninoderkinderen 0:8d87bc453349 434 * @param ethaddr Ethernet address of the inserted ARP entry.
ninoderkinderen 0:8d87bc453349 435 * @param flags @see definition of ETHARP_FLAG_*
ninoderkinderen 0:8d87bc453349 436 *
ninoderkinderen 0:8d87bc453349 437 * @return
ninoderkinderen 0:8d87bc453349 438 * - ERR_OK Succesfully updated ARP cache.
ninoderkinderen 0:8d87bc453349 439 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
ninoderkinderen 0:8d87bc453349 440 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
ninoderkinderen 0:8d87bc453349 441 *
ninoderkinderen 0:8d87bc453349 442 * @see pbuf_free()
ninoderkinderen 0:8d87bc453349 443 */
ninoderkinderen 0:8d87bc453349 444 static err_t
ninoderkinderen 0:8d87bc453349 445 update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
ninoderkinderen 0:8d87bc453349 446 {
ninoderkinderen 0:8d87bc453349 447 s8_t i;
ninoderkinderen 0:8d87bc453349 448 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
ninoderkinderen 0:8d87bc453349 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",
ninoderkinderen 0:8d87bc453349 450 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
ninoderkinderen 0:8d87bc453349 451 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
ninoderkinderen 0:8d87bc453349 452 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
ninoderkinderen 0:8d87bc453349 453 /* non-unicast address? */
ninoderkinderen 0:8d87bc453349 454 if (ip_addr_isany(ipaddr) ||
ninoderkinderen 0:8d87bc453349 455 ip_addr_isbroadcast(ipaddr, netif) ||
ninoderkinderen 0:8d87bc453349 456 ip_addr_ismulticast(ipaddr)) {
ninoderkinderen 0:8d87bc453349 457 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
ninoderkinderen 0:8d87bc453349 458 return ERR_ARG;
ninoderkinderen 0:8d87bc453349 459 }
ninoderkinderen 0:8d87bc453349 460 /* find or create ARP entry */
ninoderkinderen 0:8d87bc453349 461 i = find_entry(ipaddr, flags);
ninoderkinderen 0:8d87bc453349 462 /* bail out if no entry could be found */
ninoderkinderen 0:8d87bc453349 463 if (i < 0) {
ninoderkinderen 0:8d87bc453349 464 return (err_t)i;
ninoderkinderen 0:8d87bc453349 465 }
ninoderkinderen 0:8d87bc453349 466
ninoderkinderen 0:8d87bc453349 467 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 468 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
ninoderkinderen 0:8d87bc453349 469 /* record static type */
ninoderkinderen 0:8d87bc453349 470 arp_table[i].static_entry = 1;
ninoderkinderen 0:8d87bc453349 471 }
ninoderkinderen 0:8d87bc453349 472 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 473
ninoderkinderen 0:8d87bc453349 474 /* mark it stable */
ninoderkinderen 0:8d87bc453349 475 arp_table[i].state = ETHARP_STATE_STABLE;
ninoderkinderen 0:8d87bc453349 476
ninoderkinderen 0:8d87bc453349 477 #if LWIP_SNMP
ninoderkinderen 0:8d87bc453349 478 /* record network interface */
ninoderkinderen 0:8d87bc453349 479 arp_table[i].netif = netif;
ninoderkinderen 0:8d87bc453349 480 #endif /* LWIP_SNMP */
ninoderkinderen 0:8d87bc453349 481 /* insert in SNMP ARP index tree */
ninoderkinderen 0:8d87bc453349 482 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
ninoderkinderen 0:8d87bc453349 483
ninoderkinderen 0:8d87bc453349 484 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
ninoderkinderen 0:8d87bc453349 485 /* update address */
ninoderkinderen 0:8d87bc453349 486 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
ninoderkinderen 0:8d87bc453349 487 /* reset time stamp */
ninoderkinderen 0:8d87bc453349 488 arp_table[i].ctime = 0;
ninoderkinderen 0:8d87bc453349 489 #if ARP_QUEUEING
ninoderkinderen 0:8d87bc453349 490 /* this is where we will send out queued packets! */
ninoderkinderen 0:8d87bc453349 491 while (arp_table[i].q != NULL) {
ninoderkinderen 0:8d87bc453349 492 struct pbuf *p;
ninoderkinderen 0:8d87bc453349 493 /* remember remainder of queue */
ninoderkinderen 0:8d87bc453349 494 struct etharp_q_entry *q = arp_table[i].q;
ninoderkinderen 0:8d87bc453349 495 /* pop first item off the queue */
ninoderkinderen 0:8d87bc453349 496 arp_table[i].q = q->next;
ninoderkinderen 0:8d87bc453349 497 /* get the packet pointer */
ninoderkinderen 0:8d87bc453349 498 p = q->p;
ninoderkinderen 0:8d87bc453349 499 /* now queue entry can be freed */
ninoderkinderen 0:8d87bc453349 500 memp_free(MEMP_ARP_QUEUE, q);
ninoderkinderen 0:8d87bc453349 501 /* send the queued IP packet */
ninoderkinderen 0:8d87bc453349 502 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
ninoderkinderen 0:8d87bc453349 503 /* free the queued IP packet */
ninoderkinderen 0:8d87bc453349 504 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 505 }
ninoderkinderen 0:8d87bc453349 506 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 507 return ERR_OK;
ninoderkinderen 0:8d87bc453349 508 }
ninoderkinderen 0:8d87bc453349 509
ninoderkinderen 0:8d87bc453349 510 #if ETHARP_SUPPORT_STATIC_ENTRIES
ninoderkinderen 0:8d87bc453349 511 /** Add a new static entry to the ARP table. If an entry exists for the
ninoderkinderen 0:8d87bc453349 512 * specified IP address, this entry is overwritten.
ninoderkinderen 0:8d87bc453349 513 * If packets are queued for the specified IP address, they are sent out.
ninoderkinderen 0:8d87bc453349 514 *
ninoderkinderen 0:8d87bc453349 515 * @param ipaddr IP address for the new static entry
ninoderkinderen 0:8d87bc453349 516 * @param ethaddr ethernet address for the new static entry
ninoderkinderen 0:8d87bc453349 517 * @return @see return values of etharp_add_static_entry
ninoderkinderen 0:8d87bc453349 518 */
ninoderkinderen 0:8d87bc453349 519 err_t
ninoderkinderen 0:8d87bc453349 520 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
ninoderkinderen 0:8d87bc453349 521 {
ninoderkinderen 0:8d87bc453349 522 struct netif *netif;
ninoderkinderen 0:8d87bc453349 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",
ninoderkinderen 0:8d87bc453349 524 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
ninoderkinderen 0:8d87bc453349 525 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
ninoderkinderen 0:8d87bc453349 526 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
ninoderkinderen 0:8d87bc453349 527
ninoderkinderen 0:8d87bc453349 528 netif = ip_route(ipaddr);
ninoderkinderen 0:8d87bc453349 529 if (netif == NULL) {
ninoderkinderen 0:8d87bc453349 530 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 531 }
ninoderkinderen 0:8d87bc453349 532
ninoderkinderen 0:8d87bc453349 533 return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
ninoderkinderen 0:8d87bc453349 534 }
ninoderkinderen 0:8d87bc453349 535
ninoderkinderen 0:8d87bc453349 536 /** Remove a static entry from the ARP table previously added with a call to
ninoderkinderen 0:8d87bc453349 537 * etharp_add_static_entry.
ninoderkinderen 0:8d87bc453349 538 *
ninoderkinderen 0:8d87bc453349 539 * @param ipaddr IP address of the static entry to remove
ninoderkinderen 0:8d87bc453349 540 * @return ERR_OK: entry removed
ninoderkinderen 0:8d87bc453349 541 * ERR_MEM: entry wasn't found
ninoderkinderen 0:8d87bc453349 542 * ERR_ARG: entry wasn't a static entry but a dynamic one
ninoderkinderen 0:8d87bc453349 543 */
ninoderkinderen 0:8d87bc453349 544 err_t
ninoderkinderen 0:8d87bc453349 545 etharp_remove_static_entry(ip_addr_t *ipaddr)
ninoderkinderen 0:8d87bc453349 546 {
ninoderkinderen 0:8d87bc453349 547 s8_t i;
ninoderkinderen 0:8d87bc453349 548 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 549 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
ninoderkinderen 0:8d87bc453349 550
ninoderkinderen 0:8d87bc453349 551 /* find or create ARP entry */
ninoderkinderen 0:8d87bc453349 552 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
ninoderkinderen 0:8d87bc453349 553 /* bail out if no entry could be found */
ninoderkinderen 0:8d87bc453349 554 if (i < 0) {
ninoderkinderen 0:8d87bc453349 555 return (err_t)i;
ninoderkinderen 0:8d87bc453349 556 }
ninoderkinderen 0:8d87bc453349 557
ninoderkinderen 0:8d87bc453349 558 if ((arp_table[i].state != ETHARP_STATE_STABLE) ||
ninoderkinderen 0:8d87bc453349 559 (arp_table[i].static_entry == 0)) {
ninoderkinderen 0:8d87bc453349 560 /* entry wasn't a static entry, cannot remove it */
ninoderkinderen 0:8d87bc453349 561 return ERR_ARG;
ninoderkinderen 0:8d87bc453349 562 }
ninoderkinderen 0:8d87bc453349 563 /* entry found, free it */
ninoderkinderen 0:8d87bc453349 564 free_entry(i);
ninoderkinderen 0:8d87bc453349 565 return ERR_OK;
ninoderkinderen 0:8d87bc453349 566 }
ninoderkinderen 0:8d87bc453349 567 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
ninoderkinderen 0:8d87bc453349 568
ninoderkinderen 0:8d87bc453349 569 /**
ninoderkinderen 0:8d87bc453349 570 * Finds (stable) ethernet/IP address pair from ARP table
ninoderkinderen 0:8d87bc453349 571 * using interface and IP address index.
ninoderkinderen 0:8d87bc453349 572 * @note the addresses in the ARP table are in network order!
ninoderkinderen 0:8d87bc453349 573 *
ninoderkinderen 0:8d87bc453349 574 * @param netif points to interface index
ninoderkinderen 0:8d87bc453349 575 * @param ipaddr points to the (network order) IP address index
ninoderkinderen 0:8d87bc453349 576 * @param eth_ret points to return pointer
ninoderkinderen 0:8d87bc453349 577 * @param ip_ret points to return pointer
ninoderkinderen 0:8d87bc453349 578 * @return table index if found, -1 otherwise
ninoderkinderen 0:8d87bc453349 579 */
ninoderkinderen 0:8d87bc453349 580 s8_t
ninoderkinderen 0:8d87bc453349 581 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
ninoderkinderen 0:8d87bc453349 582 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
ninoderkinderen 0:8d87bc453349 583 {
ninoderkinderen 0:8d87bc453349 584 s8_t i;
ninoderkinderen 0:8d87bc453349 585
ninoderkinderen 0:8d87bc453349 586 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
ninoderkinderen 0:8d87bc453349 587 eth_ret != NULL && ip_ret != NULL);
ninoderkinderen 0:8d87bc453349 588
ninoderkinderen 0:8d87bc453349 589 LWIP_UNUSED_ARG(netif);
ninoderkinderen 0:8d87bc453349 590
ninoderkinderen 0:8d87bc453349 591 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
ninoderkinderen 0:8d87bc453349 592 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
ninoderkinderen 0:8d87bc453349 593 *eth_ret = &arp_table[i].ethaddr;
ninoderkinderen 0:8d87bc453349 594 *ip_ret = &arp_table[i].ipaddr;
ninoderkinderen 0:8d87bc453349 595 return i;
ninoderkinderen 0:8d87bc453349 596 }
ninoderkinderen 0:8d87bc453349 597 return -1;
ninoderkinderen 0:8d87bc453349 598 }
ninoderkinderen 0:8d87bc453349 599
ninoderkinderen 0:8d87bc453349 600 #if ETHARP_TRUST_IP_MAC
ninoderkinderen 0:8d87bc453349 601 /**
ninoderkinderen 0:8d87bc453349 602 * Updates the ARP table using the given IP packet.
ninoderkinderen 0:8d87bc453349 603 *
ninoderkinderen 0:8d87bc453349 604 * Uses the incoming IP packet's source address to update the
ninoderkinderen 0:8d87bc453349 605 * ARP cache for the local network. The function does not alter
ninoderkinderen 0:8d87bc453349 606 * or free the packet. This function must be called before the
ninoderkinderen 0:8d87bc453349 607 * packet p is passed to the IP layer.
ninoderkinderen 0:8d87bc453349 608 *
ninoderkinderen 0:8d87bc453349 609 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
ninoderkinderen 0:8d87bc453349 610 * @param p The IP packet that arrived on netif.
ninoderkinderen 0:8d87bc453349 611 *
ninoderkinderen 0:8d87bc453349 612 * @return NULL
ninoderkinderen 0:8d87bc453349 613 *
ninoderkinderen 0:8d87bc453349 614 * @see pbuf_free()
ninoderkinderen 0:8d87bc453349 615 */
ninoderkinderen 0:8d87bc453349 616 static void
ninoderkinderen 0:8d87bc453349 617 etharp_ip_input(struct netif *netif, struct pbuf *p)
ninoderkinderen 0:8d87bc453349 618 {
ninoderkinderen 0:8d87bc453349 619 struct eth_hdr *ethhdr;
ninoderkinderen 0:8d87bc453349 620 struct ip_hdr *iphdr;
ninoderkinderen 0:8d87bc453349 621 ip_addr_t iphdr_src;
ninoderkinderen 0:8d87bc453349 622 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
ninoderkinderen 0:8d87bc453349 623
ninoderkinderen 0:8d87bc453349 624 /* Only insert an entry if the source IP address of the
ninoderkinderen 0:8d87bc453349 625 incoming IP packet comes from a host on the local network. */
ninoderkinderen 0:8d87bc453349 626 ethhdr = (struct eth_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 627 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
ninoderkinderen 0:8d87bc453349 628 #if ETHARP_SUPPORT_VLAN
ninoderkinderen 0:8d87bc453349 629 if (ethhdr->type == ETHTYPE_VLAN) {
ninoderkinderen 0:8d87bc453349 630 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
ninoderkinderen 0:8d87bc453349 631 }
ninoderkinderen 0:8d87bc453349 632 #endif /* ETHARP_SUPPORT_VLAN */
ninoderkinderen 0:8d87bc453349 633
ninoderkinderen 0:8d87bc453349 634 ip_addr_copy(iphdr_src, iphdr->src);
ninoderkinderen 0:8d87bc453349 635
ninoderkinderen 0:8d87bc453349 636 /* source is not on the local network? */
ninoderkinderen 0:8d87bc453349 637 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
ninoderkinderen 0:8d87bc453349 638 /* do nothing */
ninoderkinderen 0:8d87bc453349 639 return;
ninoderkinderen 0:8d87bc453349 640 }
ninoderkinderen 0:8d87bc453349 641
ninoderkinderen 0:8d87bc453349 642 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
ninoderkinderen 0:8d87bc453349 643 /* update the source IP address in the cache, if present */
ninoderkinderen 0:8d87bc453349 644 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
ninoderkinderen 0:8d87bc453349 645 * back soon (for example, if the destination IP address is ours. */
ninoderkinderen 0:8d87bc453349 646 update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
ninoderkinderen 0:8d87bc453349 647 }
ninoderkinderen 0:8d87bc453349 648 #endif /* ETHARP_TRUST_IP_MAC */
ninoderkinderen 0:8d87bc453349 649
ninoderkinderen 0:8d87bc453349 650 /**
ninoderkinderen 0:8d87bc453349 651 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
ninoderkinderen 0:8d87bc453349 652 * send out queued IP packets. Updates cache with snooped address pairs.
ninoderkinderen 0:8d87bc453349 653 *
ninoderkinderen 0:8d87bc453349 654 * Should be called for incoming ARP packets. The pbuf in the argument
ninoderkinderen 0:8d87bc453349 655 * is freed by this function.
ninoderkinderen 0:8d87bc453349 656 *
ninoderkinderen 0:8d87bc453349 657 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
ninoderkinderen 0:8d87bc453349 658 * @param ethaddr Ethernet address of netif.
ninoderkinderen 0:8d87bc453349 659 * @param p The ARP packet that arrived on netif. Is freed by this function.
ninoderkinderen 0:8d87bc453349 660 *
ninoderkinderen 0:8d87bc453349 661 * @return NULL
ninoderkinderen 0:8d87bc453349 662 *
ninoderkinderen 0:8d87bc453349 663 * @see pbuf_free()
ninoderkinderen 0:8d87bc453349 664 */
ninoderkinderen 0:8d87bc453349 665 static void
ninoderkinderen 0:8d87bc453349 666 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
ninoderkinderen 0:8d87bc453349 667 {
ninoderkinderen 0:8d87bc453349 668 struct etharp_hdr *hdr;
ninoderkinderen 0:8d87bc453349 669 struct eth_hdr *ethhdr;
ninoderkinderen 0:8d87bc453349 670 /* these are aligned properly, whereas the ARP header fields might not be */
ninoderkinderen 0:8d87bc453349 671 ip_addr_t sipaddr, dipaddr;
ninoderkinderen 0:8d87bc453349 672 u8_t for_us;
ninoderkinderen 0:8d87bc453349 673 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 674 const u8_t * ethdst_hwaddr;
ninoderkinderen 0:8d87bc453349 675 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 676
ninoderkinderen 0:8d87bc453349 677 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
ninoderkinderen 0:8d87bc453349 678
ninoderkinderen 0:8d87bc453349 679 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
ninoderkinderen 0:8d87bc453349 680 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
ninoderkinderen 0:8d87bc453349 681 if (p->len < SIZEOF_ETHARP_PACKET) {
ninoderkinderen 0:8d87bc453349 682 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
ninoderkinderen 0:8d87bc453349 683 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
ninoderkinderen 0:8d87bc453349 684 (s16_t)SIZEOF_ETHARP_PACKET));
ninoderkinderen 0:8d87bc453349 685 ETHARP_STATS_INC(etharp.lenerr);
ninoderkinderen 0:8d87bc453349 686 ETHARP_STATS_INC(etharp.drop);
ninoderkinderen 0:8d87bc453349 687 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 688 return;
ninoderkinderen 0:8d87bc453349 689 }
ninoderkinderen 0:8d87bc453349 690
ninoderkinderen 0:8d87bc453349 691 ethhdr = (struct eth_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 692 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
ninoderkinderen 0:8d87bc453349 693 #if ETHARP_SUPPORT_VLAN
ninoderkinderen 0:8d87bc453349 694 if (ethhdr->type == ETHTYPE_VLAN) {
ninoderkinderen 0:8d87bc453349 695 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
ninoderkinderen 0:8d87bc453349 696 }
ninoderkinderen 0:8d87bc453349 697 #endif /* ETHARP_SUPPORT_VLAN */
ninoderkinderen 0:8d87bc453349 698
ninoderkinderen 0:8d87bc453349 699 /* RFC 826 "Packet Reception": */
ninoderkinderen 0:8d87bc453349 700 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
ninoderkinderen 0:8d87bc453349 701 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
ninoderkinderen 0:8d87bc453349 702 (hdr->protolen != sizeof(ip_addr_t)) ||
ninoderkinderen 0:8d87bc453349 703 (hdr->proto != PP_HTONS(ETHTYPE_IP)) ||
ninoderkinderen 0:8d87bc453349 704 (ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
ninoderkinderen 0:8d87bc453349 705 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
ninoderkinderen 0:8d87bc453349 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",
ninoderkinderen 0:8d87bc453349 707 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
ninoderkinderen 0:8d87bc453349 708 ETHARP_STATS_INC(etharp.proterr);
ninoderkinderen 0:8d87bc453349 709 ETHARP_STATS_INC(etharp.drop);
ninoderkinderen 0:8d87bc453349 710 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 711 return;
ninoderkinderen 0:8d87bc453349 712 }
ninoderkinderen 0:8d87bc453349 713 ETHARP_STATS_INC(etharp.recv);
ninoderkinderen 0:8d87bc453349 714
ninoderkinderen 0:8d87bc453349 715 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 716 /* We have to check if a host already has configured our random
ninoderkinderen 0:8d87bc453349 717 * created link local address and continously check if there is
ninoderkinderen 0:8d87bc453349 718 * a host with this IP-address so we can detect collisions */
ninoderkinderen 0:8d87bc453349 719 autoip_arp_reply(netif, hdr);
ninoderkinderen 0:8d87bc453349 720 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 721
ninoderkinderen 0:8d87bc453349 722 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
ninoderkinderen 0:8d87bc453349 723 * structure packing (not using structure copy which breaks strict-aliasing rules). */
ninoderkinderen 0:8d87bc453349 724 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
ninoderkinderen 0:8d87bc453349 725 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
ninoderkinderen 0:8d87bc453349 726
ninoderkinderen 0:8d87bc453349 727 /* this interface is not configured? */
ninoderkinderen 0:8d87bc453349 728 if (ip_addr_isany(&netif->ip_addr)) {
ninoderkinderen 0:8d87bc453349 729 for_us = 0;
ninoderkinderen 0:8d87bc453349 730 } else {
ninoderkinderen 0:8d87bc453349 731 /* ARP packet directed to us? */
ninoderkinderen 0:8d87bc453349 732 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
ninoderkinderen 0:8d87bc453349 733 }
ninoderkinderen 0:8d87bc453349 734
ninoderkinderen 0:8d87bc453349 735 /* ARP message directed to us?
ninoderkinderen 0:8d87bc453349 736 -> add IP address in ARP cache; assume requester wants to talk to us,
ninoderkinderen 0:8d87bc453349 737 can result in directly sending the queued packets for this host.
ninoderkinderen 0:8d87bc453349 738 ARP message not directed to us?
ninoderkinderen 0:8d87bc453349 739 -> update the source IP address in the cache, if present */
ninoderkinderen 0:8d87bc453349 740 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
ninoderkinderen 0:8d87bc453349 741 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
ninoderkinderen 0:8d87bc453349 742
ninoderkinderen 0:8d87bc453349 743 /* now act on the message itself */
ninoderkinderen 0:8d87bc453349 744 switch (hdr->opcode) {
ninoderkinderen 0:8d87bc453349 745 /* ARP request? */
ninoderkinderen 0:8d87bc453349 746 case PP_HTONS(ARP_REQUEST):
ninoderkinderen 0:8d87bc453349 747 /* ARP request. If it asked for our address, we send out a
ninoderkinderen 0:8d87bc453349 748 * reply. In any case, we time-stamp any existing ARP entry,
ninoderkinderen 0:8d87bc453349 749 * and possiby send out an IP packet that was queued on it. */
ninoderkinderen 0:8d87bc453349 750
ninoderkinderen 0:8d87bc453349 751 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
ninoderkinderen 0:8d87bc453349 752 /* ARP request for our address? */
ninoderkinderen 0:8d87bc453349 753 if (for_us) {
ninoderkinderen 0:8d87bc453349 754
ninoderkinderen 0:8d87bc453349 755 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
ninoderkinderen 0:8d87bc453349 756 /* Re-use pbuf to send ARP reply.
ninoderkinderen 0:8d87bc453349 757 Since we are re-using an existing pbuf, we can't call etharp_raw since
ninoderkinderen 0:8d87bc453349 758 that would allocate a new pbuf. */
ninoderkinderen 0:8d87bc453349 759 hdr->opcode = htons(ARP_REPLY);
ninoderkinderen 0:8d87bc453349 760
ninoderkinderen 0:8d87bc453349 761 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
ninoderkinderen 0:8d87bc453349 762 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
ninoderkinderen 0:8d87bc453349 763
ninoderkinderen 0:8d87bc453349 764 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
ninoderkinderen 0:8d87bc453349 765 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
ninoderkinderen 0:8d87bc453349 766 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 767 /* If we are using Link-Local, all ARP packets that contain a Link-Local
ninoderkinderen 0:8d87bc453349 768 * 'sender IP address' MUST be sent using link-layer broadcast instead of
ninoderkinderen 0:8d87bc453349 769 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
ninoderkinderen 0:8d87bc453349 770 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
ninoderkinderen 0:8d87bc453349 771 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 772
ninoderkinderen 0:8d87bc453349 773 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
ninoderkinderen 0:8d87bc453349 774 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 775 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
ninoderkinderen 0:8d87bc453349 776 #else /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 777 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
ninoderkinderen 0:8d87bc453349 778 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 779 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
ninoderkinderen 0:8d87bc453349 780 ETHADDR16_COPY(&ethhdr->src, ethaddr);
ninoderkinderen 0:8d87bc453349 781
ninoderkinderen 0:8d87bc453349 782 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
ninoderkinderen 0:8d87bc453349 783 are already correct, we tested that before */
ninoderkinderen 0:8d87bc453349 784
ninoderkinderen 0:8d87bc453349 785 /* return ARP reply */
ninoderkinderen 0:8d87bc453349 786 netif->linkoutput(netif, p);
ninoderkinderen 0:8d87bc453349 787 /* we are not configured? */
ninoderkinderen 0:8d87bc453349 788 } else if (ip_addr_isany(&netif->ip_addr)) {
ninoderkinderen 0:8d87bc453349 789 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
ninoderkinderen 0:8d87bc453349 790 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
ninoderkinderen 0:8d87bc453349 791 /* request was not directed to us */
ninoderkinderen 0:8d87bc453349 792 } else {
ninoderkinderen 0:8d87bc453349 793 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
ninoderkinderen 0:8d87bc453349 794 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
ninoderkinderen 0:8d87bc453349 795 }
ninoderkinderen 0:8d87bc453349 796 break;
ninoderkinderen 0:8d87bc453349 797 case PP_HTONS(ARP_REPLY):
ninoderkinderen 0:8d87bc453349 798 /* ARP reply. We already updated the ARP cache earlier. */
ninoderkinderen 0:8d87bc453349 799 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
ninoderkinderen 0:8d87bc453349 800 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
ninoderkinderen 0:8d87bc453349 801 /* DHCP wants to know about ARP replies from any host with an
ninoderkinderen 0:8d87bc453349 802 * IP address also offered to us by the DHCP server. We do not
ninoderkinderen 0:8d87bc453349 803 * want to take a duplicate IP address on a single network.
ninoderkinderen 0:8d87bc453349 804 * @todo How should we handle redundant (fail-over) interfaces? */
ninoderkinderen 0:8d87bc453349 805 dhcp_arp_reply(netif, &sipaddr);
ninoderkinderen 0:8d87bc453349 806 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
ninoderkinderen 0:8d87bc453349 807 break;
ninoderkinderen 0:8d87bc453349 808 default:
ninoderkinderen 0:8d87bc453349 809 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
ninoderkinderen 0:8d87bc453349 810 ETHARP_STATS_INC(etharp.err);
ninoderkinderen 0:8d87bc453349 811 break;
ninoderkinderen 0:8d87bc453349 812 }
ninoderkinderen 0:8d87bc453349 813 /* free ARP packet */
ninoderkinderen 0:8d87bc453349 814 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 815 }
ninoderkinderen 0:8d87bc453349 816
ninoderkinderen 0:8d87bc453349 817 /**
ninoderkinderen 0:8d87bc453349 818 * Resolve and fill-in Ethernet address header for outgoing IP packet.
ninoderkinderen 0:8d87bc453349 819 *
ninoderkinderen 0:8d87bc453349 820 * For IP multicast and broadcast, corresponding Ethernet addresses
ninoderkinderen 0:8d87bc453349 821 * are selected and the packet is transmitted on the link.
ninoderkinderen 0:8d87bc453349 822 *
ninoderkinderen 0:8d87bc453349 823 * For unicast addresses, the packet is submitted to etharp_query(). In
ninoderkinderen 0:8d87bc453349 824 * case the IP address is outside the local network, the IP address of
ninoderkinderen 0:8d87bc453349 825 * the gateway is used.
ninoderkinderen 0:8d87bc453349 826 *
ninoderkinderen 0:8d87bc453349 827 * @param netif The lwIP network interface which the IP packet will be sent on.
ninoderkinderen 0:8d87bc453349 828 * @param q The pbuf(s) containing the IP packet to be sent.
ninoderkinderen 0:8d87bc453349 829 * @param ipaddr The IP address of the packet destination.
ninoderkinderen 0:8d87bc453349 830 *
ninoderkinderen 0:8d87bc453349 831 * @return
ninoderkinderen 0:8d87bc453349 832 * - ERR_RTE No route to destination (no gateway to external networks),
ninoderkinderen 0:8d87bc453349 833 * or the return type of either etharp_query() or etharp_send_ip().
ninoderkinderen 0:8d87bc453349 834 */
ninoderkinderen 0:8d87bc453349 835 err_t
ninoderkinderen 0:8d87bc453349 836 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
ninoderkinderen 0:8d87bc453349 837 {
ninoderkinderen 0:8d87bc453349 838 struct eth_addr *dest, mcastaddr;
ninoderkinderen 0:8d87bc453349 839
ninoderkinderen 0:8d87bc453349 840 /* make room for Ethernet header - should not fail */
ninoderkinderen 0:8d87bc453349 841 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
ninoderkinderen 0:8d87bc453349 842 /* bail out */
ninoderkinderen 0:8d87bc453349 843 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 844 ("etharp_output: could not allocate room for header.\n"));
ninoderkinderen 0:8d87bc453349 845 LINK_STATS_INC(link.lenerr);
ninoderkinderen 0:8d87bc453349 846 return ERR_BUF;
ninoderkinderen 0:8d87bc453349 847 }
ninoderkinderen 0:8d87bc453349 848
ninoderkinderen 0:8d87bc453349 849 /* assume unresolved Ethernet address */
ninoderkinderen 0:8d87bc453349 850 dest = NULL;
ninoderkinderen 0:8d87bc453349 851 /* Determine on destination hardware address. Broadcasts and multicasts
ninoderkinderen 0:8d87bc453349 852 * are special, other IP addresses are looked up in the ARP table. */
ninoderkinderen 0:8d87bc453349 853
ninoderkinderen 0:8d87bc453349 854 /* broadcast destination IP address? */
ninoderkinderen 0:8d87bc453349 855 if (ip_addr_isbroadcast(ipaddr, netif)) {
ninoderkinderen 0:8d87bc453349 856 /* broadcast on Ethernet also */
ninoderkinderen 0:8d87bc453349 857 dest = (struct eth_addr *)&ethbroadcast;
ninoderkinderen 0:8d87bc453349 858 /* multicast destination IP address? */
ninoderkinderen 0:8d87bc453349 859 } else if (ip_addr_ismulticast(ipaddr)) {
ninoderkinderen 0:8d87bc453349 860 /* Hash IP multicast address to MAC address.*/
ninoderkinderen 0:8d87bc453349 861 mcastaddr.addr[0] = 0x01;
ninoderkinderen 0:8d87bc453349 862 mcastaddr.addr[1] = 0x00;
ninoderkinderen 0:8d87bc453349 863 mcastaddr.addr[2] = 0x5e;
ninoderkinderen 0:8d87bc453349 864 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
ninoderkinderen 0:8d87bc453349 865 mcastaddr.addr[4] = ip4_addr3(ipaddr);
ninoderkinderen 0:8d87bc453349 866 mcastaddr.addr[5] = ip4_addr4(ipaddr);
ninoderkinderen 0:8d87bc453349 867 /* destination Ethernet address is multicast */
ninoderkinderen 0:8d87bc453349 868 dest = &mcastaddr;
ninoderkinderen 0:8d87bc453349 869 /* unicast destination IP address? */
ninoderkinderen 0:8d87bc453349 870 } else {
ninoderkinderen 0:8d87bc453349 871 /* outside local network? */
ninoderkinderen 0:8d87bc453349 872 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
ninoderkinderen 0:8d87bc453349 873 !ip_addr_islinklocal(ipaddr)) {
ninoderkinderen 0:8d87bc453349 874 /* interface has default gateway? */
ninoderkinderen 0:8d87bc453349 875 if (!ip_addr_isany(&netif->gw)) {
ninoderkinderen 0:8d87bc453349 876 /* send to hardware address of default gateway IP address */
ninoderkinderen 0:8d87bc453349 877 ipaddr = &(netif->gw);
ninoderkinderen 0:8d87bc453349 878 /* no default gateway available */
ninoderkinderen 0:8d87bc453349 879 } else {
ninoderkinderen 0:8d87bc453349 880 /* no route to destination error (default gateway missing) */
ninoderkinderen 0:8d87bc453349 881 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 882 }
ninoderkinderen 0:8d87bc453349 883 }
ninoderkinderen 0:8d87bc453349 884 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 885 if (netif->addr_hint != NULL) {
ninoderkinderen 0:8d87bc453349 886 /* per-pcb cached entry was given */
ninoderkinderen 0:8d87bc453349 887 u8_t etharp_cached_entry = *(netif->addr_hint);
ninoderkinderen 0:8d87bc453349 888 if (etharp_cached_entry < ARP_TABLE_SIZE) {
ninoderkinderen 0:8d87bc453349 889 #endif /* LWIP_NETIF_HWADDRHINT */
ninoderkinderen 0:8d87bc453349 890 if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
ninoderkinderen 0:8d87bc453349 891 (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
ninoderkinderen 0:8d87bc453349 892 /* the per-pcb-cached entry is stable and the right one! */
ninoderkinderen 0:8d87bc453349 893 ETHARP_STATS_INC(etharp.cachehit);
ninoderkinderen 0:8d87bc453349 894 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
ninoderkinderen 0:8d87bc453349 895 &arp_table[etharp_cached_entry].ethaddr);
ninoderkinderen 0:8d87bc453349 896 }
ninoderkinderen 0:8d87bc453349 897 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 898 }
ninoderkinderen 0:8d87bc453349 899 }
ninoderkinderen 0:8d87bc453349 900 #endif /* LWIP_NETIF_HWADDRHINT */
ninoderkinderen 0:8d87bc453349 901 /* queue on destination Ethernet address belonging to ipaddr */
ninoderkinderen 0:8d87bc453349 902 return etharp_query(netif, ipaddr, q);
ninoderkinderen 0:8d87bc453349 903 }
ninoderkinderen 0:8d87bc453349 904
ninoderkinderen 0:8d87bc453349 905 /* continuation for multicast/broadcast destinations */
ninoderkinderen 0:8d87bc453349 906 /* obtain source Ethernet address of the given interface */
ninoderkinderen 0:8d87bc453349 907 /* send packet directly on the link */
ninoderkinderen 0:8d87bc453349 908 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
ninoderkinderen 0:8d87bc453349 909 }
ninoderkinderen 0:8d87bc453349 910
ninoderkinderen 0:8d87bc453349 911 /**
ninoderkinderen 0:8d87bc453349 912 * Send an ARP request for the given IP address and/or queue a packet.
ninoderkinderen 0:8d87bc453349 913 *
ninoderkinderen 0:8d87bc453349 914 * If the IP address was not yet in the cache, a pending ARP cache entry
ninoderkinderen 0:8d87bc453349 915 * is added and an ARP request is sent for the given address. The packet
ninoderkinderen 0:8d87bc453349 916 * is queued on this entry.
ninoderkinderen 0:8d87bc453349 917 *
ninoderkinderen 0:8d87bc453349 918 * If the IP address was already pending in the cache, a new ARP request
ninoderkinderen 0:8d87bc453349 919 * is sent for the given address. The packet is queued on this entry.
ninoderkinderen 0:8d87bc453349 920 *
ninoderkinderen 0:8d87bc453349 921 * If the IP address was already stable in the cache, and a packet is
ninoderkinderen 0:8d87bc453349 922 * given, it is directly sent and no ARP request is sent out.
ninoderkinderen 0:8d87bc453349 923 *
ninoderkinderen 0:8d87bc453349 924 * If the IP address was already stable in the cache, and no packet is
ninoderkinderen 0:8d87bc453349 925 * given, an ARP request is sent out.
ninoderkinderen 0:8d87bc453349 926 *
ninoderkinderen 0:8d87bc453349 927 * @param netif The lwIP network interface on which ipaddr
ninoderkinderen 0:8d87bc453349 928 * must be queried for.
ninoderkinderen 0:8d87bc453349 929 * @param ipaddr The IP address to be resolved.
ninoderkinderen 0:8d87bc453349 930 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
ninoderkinderen 0:8d87bc453349 931 * q is not freed by this function.
ninoderkinderen 0:8d87bc453349 932 *
ninoderkinderen 0:8d87bc453349 933 * @note q must only be ONE packet, not a packet queue!
ninoderkinderen 0:8d87bc453349 934 *
ninoderkinderen 0:8d87bc453349 935 * @return
ninoderkinderen 0:8d87bc453349 936 * - ERR_BUF Could not make room for Ethernet header.
ninoderkinderen 0:8d87bc453349 937 * - ERR_MEM Hardware address unknown, and no more ARP entries available
ninoderkinderen 0:8d87bc453349 938 * to query for address or queue the packet.
ninoderkinderen 0:8d87bc453349 939 * - ERR_MEM Could not queue packet due to memory shortage.
ninoderkinderen 0:8d87bc453349 940 * - ERR_RTE No route to destination (no gateway to external networks).
ninoderkinderen 0:8d87bc453349 941 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
ninoderkinderen 0:8d87bc453349 942 *
ninoderkinderen 0:8d87bc453349 943 */
ninoderkinderen 0:8d87bc453349 944 err_t
ninoderkinderen 0:8d87bc453349 945 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
ninoderkinderen 0:8d87bc453349 946 {
ninoderkinderen 0:8d87bc453349 947 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
ninoderkinderen 0:8d87bc453349 948 err_t result = ERR_MEM;
ninoderkinderen 0:8d87bc453349 949 s8_t i; /* ARP entry index */
ninoderkinderen 0:8d87bc453349 950
ninoderkinderen 0:8d87bc453349 951 /* non-unicast address? */
ninoderkinderen 0:8d87bc453349 952 if (ip_addr_isbroadcast(ipaddr, netif) ||
ninoderkinderen 0:8d87bc453349 953 ip_addr_ismulticast(ipaddr) ||
ninoderkinderen 0:8d87bc453349 954 ip_addr_isany(ipaddr)) {
ninoderkinderen 0:8d87bc453349 955 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
ninoderkinderen 0:8d87bc453349 956 return ERR_ARG;
ninoderkinderen 0:8d87bc453349 957 }
ninoderkinderen 0:8d87bc453349 958
ninoderkinderen 0:8d87bc453349 959 /* find entry in ARP cache, ask to create entry if queueing packet */
ninoderkinderen 0:8d87bc453349 960 i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
ninoderkinderen 0:8d87bc453349 961
ninoderkinderen 0:8d87bc453349 962 /* could not find or create entry? */
ninoderkinderen 0:8d87bc453349 963 if (i < 0) {
ninoderkinderen 0:8d87bc453349 964 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
ninoderkinderen 0:8d87bc453349 965 if (q) {
ninoderkinderen 0:8d87bc453349 966 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
ninoderkinderen 0:8d87bc453349 967 ETHARP_STATS_INC(etharp.memerr);
ninoderkinderen 0:8d87bc453349 968 }
ninoderkinderen 0:8d87bc453349 969 return (err_t)i;
ninoderkinderen 0:8d87bc453349 970 }
ninoderkinderen 0:8d87bc453349 971
ninoderkinderen 0:8d87bc453349 972 /* mark a fresh entry as pending (we just sent a request) */
ninoderkinderen 0:8d87bc453349 973 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
ninoderkinderen 0:8d87bc453349 974 arp_table[i].state = ETHARP_STATE_PENDING;
ninoderkinderen 0:8d87bc453349 975 }
ninoderkinderen 0:8d87bc453349 976
ninoderkinderen 0:8d87bc453349 977 /* { i is either a STABLE or (new or existing) PENDING entry } */
ninoderkinderen 0:8d87bc453349 978 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
ninoderkinderen 0:8d87bc453349 979 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
ninoderkinderen 0:8d87bc453349 980 (arp_table[i].state == ETHARP_STATE_STABLE)));
ninoderkinderen 0:8d87bc453349 981
ninoderkinderen 0:8d87bc453349 982 /* do we have a pending entry? or an implicit query request? */
ninoderkinderen 0:8d87bc453349 983 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
ninoderkinderen 0:8d87bc453349 984 /* try to resolve it; send out ARP request */
ninoderkinderen 0:8d87bc453349 985 result = etharp_request(netif, ipaddr);
ninoderkinderen 0:8d87bc453349 986 if (result != ERR_OK) {
ninoderkinderen 0:8d87bc453349 987 /* ARP request couldn't be sent */
ninoderkinderen 0:8d87bc453349 988 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
ninoderkinderen 0:8d87bc453349 989 since this failure could be temporary, and the next packet calling
ninoderkinderen 0:8d87bc453349 990 etharp_query again could lead to sending the queued packets. */
ninoderkinderen 0:8d87bc453349 991 }
ninoderkinderen 0:8d87bc453349 992 if (q == NULL) {
ninoderkinderen 0:8d87bc453349 993 return result;
ninoderkinderen 0:8d87bc453349 994 }
ninoderkinderen 0:8d87bc453349 995 }
ninoderkinderen 0:8d87bc453349 996
ninoderkinderen 0:8d87bc453349 997 /* packet given? */
ninoderkinderen 0:8d87bc453349 998 LWIP_ASSERT("q != NULL", q != NULL);
ninoderkinderen 0:8d87bc453349 999 /* stable entry? */
ninoderkinderen 0:8d87bc453349 1000 if (arp_table[i].state == ETHARP_STATE_STABLE) {
ninoderkinderen 0:8d87bc453349 1001 /* we have a valid IP->Ethernet address mapping */
ninoderkinderen 0:8d87bc453349 1002 ETHARP_SET_HINT(netif, i);
ninoderkinderen 0:8d87bc453349 1003 /* send the packet */
ninoderkinderen 0:8d87bc453349 1004 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
ninoderkinderen 0:8d87bc453349 1005 /* pending entry? (either just created or already pending */
ninoderkinderen 0:8d87bc453349 1006 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
ninoderkinderen 0:8d87bc453349 1007 #if ARP_QUEUEING /* queue the given q packet */
ninoderkinderen 0:8d87bc453349 1008 struct pbuf *p;
ninoderkinderen 0:8d87bc453349 1009 int copy_needed = 0;
ninoderkinderen 0:8d87bc453349 1010 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
ninoderkinderen 0:8d87bc453349 1011 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
ninoderkinderen 0:8d87bc453349 1012 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
ninoderkinderen 0:8d87bc453349 1013 p = q;
ninoderkinderen 0:8d87bc453349 1014 while (p) {
ninoderkinderen 0:8d87bc453349 1015 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
ninoderkinderen 0:8d87bc453349 1016 if(p->type != PBUF_ROM) {
ninoderkinderen 0:8d87bc453349 1017 copy_needed = 1;
ninoderkinderen 0:8d87bc453349 1018 break;
ninoderkinderen 0:8d87bc453349 1019 }
ninoderkinderen 0:8d87bc453349 1020 p = p->next;
ninoderkinderen 0:8d87bc453349 1021 }
ninoderkinderen 0:8d87bc453349 1022 if(copy_needed) {
ninoderkinderen 0:8d87bc453349 1023 /* copy the whole packet into new pbufs */
ninoderkinderen 0:8d87bc453349 1024 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
ninoderkinderen 0:8d87bc453349 1025 if(p != NULL) {
ninoderkinderen 0:8d87bc453349 1026 if (pbuf_copy(p, q) != ERR_OK) {
ninoderkinderen 0:8d87bc453349 1027 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 1028 p = NULL;
ninoderkinderen 0:8d87bc453349 1029 }
ninoderkinderen 0:8d87bc453349 1030 }
ninoderkinderen 0:8d87bc453349 1031 } else {
ninoderkinderen 0:8d87bc453349 1032 /* referencing the old pbuf is enough */
ninoderkinderen 0:8d87bc453349 1033 p = q;
ninoderkinderen 0:8d87bc453349 1034 pbuf_ref(p);
ninoderkinderen 0:8d87bc453349 1035 }
ninoderkinderen 0:8d87bc453349 1036 /* packet could be taken over? */
ninoderkinderen 0:8d87bc453349 1037 if (p != NULL) {
ninoderkinderen 0:8d87bc453349 1038 /* queue packet ... */
ninoderkinderen 0:8d87bc453349 1039 struct etharp_q_entry *new_entry;
ninoderkinderen 0:8d87bc453349 1040 /* allocate a new arp queue entry */
ninoderkinderen 0:8d87bc453349 1041 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
ninoderkinderen 0:8d87bc453349 1042 if (new_entry != NULL) {
ninoderkinderen 0:8d87bc453349 1043 new_entry->next = 0;
ninoderkinderen 0:8d87bc453349 1044 new_entry->p = p;
ninoderkinderen 0:8d87bc453349 1045 if(arp_table[i].q != NULL) {
ninoderkinderen 0:8d87bc453349 1046 /* queue was already existent, append the new entry to the end */
ninoderkinderen 0:8d87bc453349 1047 struct etharp_q_entry *r;
ninoderkinderen 0:8d87bc453349 1048 r = arp_table[i].q;
ninoderkinderen 0:8d87bc453349 1049 while (r->next != NULL) {
ninoderkinderen 0:8d87bc453349 1050 r = r->next;
ninoderkinderen 0:8d87bc453349 1051 }
ninoderkinderen 0:8d87bc453349 1052 r->next = new_entry;
ninoderkinderen 0:8d87bc453349 1053 } else {
ninoderkinderen 0:8d87bc453349 1054 /* queue did not exist, first item in queue */
ninoderkinderen 0:8d87bc453349 1055 arp_table[i].q = new_entry;
ninoderkinderen 0:8d87bc453349 1056 }
ninoderkinderen 0:8d87bc453349 1057 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
ninoderkinderen 0:8d87bc453349 1058 result = ERR_OK;
ninoderkinderen 0:8d87bc453349 1059 } else {
ninoderkinderen 0:8d87bc453349 1060 /* the pool MEMP_ARP_QUEUE is empty */
ninoderkinderen 0:8d87bc453349 1061 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 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));
ninoderkinderen 0:8d87bc453349 1063 /* { result == ERR_MEM } through initialization */
ninoderkinderen 0:8d87bc453349 1064 }
ninoderkinderen 0:8d87bc453349 1065 } else {
ninoderkinderen 0:8d87bc453349 1066 ETHARP_STATS_INC(etharp.memerr);
ninoderkinderen 0:8d87bc453349 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));
ninoderkinderen 0:8d87bc453349 1068 /* { result == ERR_MEM } through initialization */
ninoderkinderen 0:8d87bc453349 1069 }
ninoderkinderen 0:8d87bc453349 1070 #else /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 1071 /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
ninoderkinderen 0:8d87bc453349 1072 /* { result == ERR_MEM } through initialization */
ninoderkinderen 0:8d87bc453349 1073 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
ninoderkinderen 0:8d87bc453349 1074 #endif /* ARP_QUEUEING */
ninoderkinderen 0:8d87bc453349 1075 }
ninoderkinderen 0:8d87bc453349 1076 return result;
ninoderkinderen 0:8d87bc453349 1077 }
ninoderkinderen 0:8d87bc453349 1078
ninoderkinderen 0:8d87bc453349 1079 /**
ninoderkinderen 0:8d87bc453349 1080 * Send a raw ARP packet (opcode and all addresses can be modified)
ninoderkinderen 0:8d87bc453349 1081 *
ninoderkinderen 0:8d87bc453349 1082 * @param netif the lwip network interface on which to send the ARP packet
ninoderkinderen 0:8d87bc453349 1083 * @param ethsrc_addr the source MAC address for the ethernet header
ninoderkinderen 0:8d87bc453349 1084 * @param ethdst_addr the destination MAC address for the ethernet header
ninoderkinderen 0:8d87bc453349 1085 * @param hwsrc_addr the source MAC address for the ARP protocol header
ninoderkinderen 0:8d87bc453349 1086 * @param ipsrc_addr the source IP address for the ARP protocol header
ninoderkinderen 0:8d87bc453349 1087 * @param hwdst_addr the destination MAC address for the ARP protocol header
ninoderkinderen 0:8d87bc453349 1088 * @param ipdst_addr the destination IP address for the ARP protocol header
ninoderkinderen 0:8d87bc453349 1089 * @param opcode the type of the ARP packet
ninoderkinderen 0:8d87bc453349 1090 * @return ERR_OK if the ARP packet has been sent
ninoderkinderen 0:8d87bc453349 1091 * ERR_MEM if the ARP packet couldn't be allocated
ninoderkinderen 0:8d87bc453349 1092 * any other err_t on failure
ninoderkinderen 0:8d87bc453349 1093 */
ninoderkinderen 0:8d87bc453349 1094 #if !LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 1095 static
ninoderkinderen 0:8d87bc453349 1096 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 1097 err_t
ninoderkinderen 0:8d87bc453349 1098 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
ninoderkinderen 0:8d87bc453349 1099 const struct eth_addr *ethdst_addr,
ninoderkinderen 0:8d87bc453349 1100 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
ninoderkinderen 0:8d87bc453349 1101 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
ninoderkinderen 0:8d87bc453349 1102 const u16_t opcode)
ninoderkinderen 0:8d87bc453349 1103 {
ninoderkinderen 0:8d87bc453349 1104 struct pbuf *p;
ninoderkinderen 0:8d87bc453349 1105 err_t result = ERR_OK;
ninoderkinderen 0:8d87bc453349 1106 struct eth_hdr *ethhdr;
ninoderkinderen 0:8d87bc453349 1107 struct etharp_hdr *hdr;
ninoderkinderen 0:8d87bc453349 1108 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 1109 const u8_t * ethdst_hwaddr;
ninoderkinderen 0:8d87bc453349 1110 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 1111
ninoderkinderen 0:8d87bc453349 1112 /* allocate a pbuf for the outgoing ARP request packet */
ninoderkinderen 0:8d87bc453349 1113 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
ninoderkinderen 0:8d87bc453349 1114 /* could allocate a pbuf for an ARP request? */
ninoderkinderen 0:8d87bc453349 1115 if (p == NULL) {
ninoderkinderen 0:8d87bc453349 1116 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 1117 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
ninoderkinderen 0:8d87bc453349 1118 ETHARP_STATS_INC(etharp.memerr);
ninoderkinderen 0:8d87bc453349 1119 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 1120 }
ninoderkinderen 0:8d87bc453349 1121 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
ninoderkinderen 0:8d87bc453349 1122 (p->len >= SIZEOF_ETHARP_PACKET));
ninoderkinderen 0:8d87bc453349 1123
ninoderkinderen 0:8d87bc453349 1124 ethhdr = (struct eth_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 1125 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
ninoderkinderen 0:8d87bc453349 1126 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
ninoderkinderen 0:8d87bc453349 1127 hdr->opcode = htons(opcode);
ninoderkinderen 0:8d87bc453349 1128
ninoderkinderen 0:8d87bc453349 1129 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
ninoderkinderen 0:8d87bc453349 1130 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
ninoderkinderen 0:8d87bc453349 1131 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 1132 /* If we are using Link-Local, all ARP packets that contain a Link-Local
ninoderkinderen 0:8d87bc453349 1133 * 'sender IP address' MUST be sent using link-layer broadcast instead of
ninoderkinderen 0:8d87bc453349 1134 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
ninoderkinderen 0:8d87bc453349 1135 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
ninoderkinderen 0:8d87bc453349 1136 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 1137 /* Write the ARP MAC-Addresses */
ninoderkinderen 0:8d87bc453349 1138 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
ninoderkinderen 0:8d87bc453349 1139 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
ninoderkinderen 0:8d87bc453349 1140 /* Write the Ethernet MAC-Addresses */
ninoderkinderen 0:8d87bc453349 1141 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 1142 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
ninoderkinderen 0:8d87bc453349 1143 #else /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 1144 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
ninoderkinderen 0:8d87bc453349 1145 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 1146 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
ninoderkinderen 0:8d87bc453349 1147 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
ninoderkinderen 0:8d87bc453349 1148 * structure packing. */
ninoderkinderen 0:8d87bc453349 1149 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
ninoderkinderen 0:8d87bc453349 1150 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
ninoderkinderen 0:8d87bc453349 1151
ninoderkinderen 0:8d87bc453349 1152 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
ninoderkinderen 0:8d87bc453349 1153 hdr->proto = PP_HTONS(ETHTYPE_IP);
ninoderkinderen 0:8d87bc453349 1154 /* set hwlen and protolen */
ninoderkinderen 0:8d87bc453349 1155 hdr->hwlen = ETHARP_HWADDR_LEN;
ninoderkinderen 0:8d87bc453349 1156 hdr->protolen = sizeof(ip_addr_t);
ninoderkinderen 0:8d87bc453349 1157
ninoderkinderen 0:8d87bc453349 1158 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
ninoderkinderen 0:8d87bc453349 1159 /* send ARP query */
ninoderkinderen 0:8d87bc453349 1160 result = netif->linkoutput(netif, p);
ninoderkinderen 0:8d87bc453349 1161 ETHARP_STATS_INC(etharp.xmit);
ninoderkinderen 0:8d87bc453349 1162 /* free ARP query packet */
ninoderkinderen 0:8d87bc453349 1163 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 1164 p = NULL;
ninoderkinderen 0:8d87bc453349 1165 /* could not allocate pbuf for ARP request */
ninoderkinderen 0:8d87bc453349 1166
ninoderkinderen 0:8d87bc453349 1167 return result;
ninoderkinderen 0:8d87bc453349 1168 }
ninoderkinderen 0:8d87bc453349 1169
ninoderkinderen 0:8d87bc453349 1170 /**
ninoderkinderen 0:8d87bc453349 1171 * Send an ARP request packet asking for ipaddr.
ninoderkinderen 0:8d87bc453349 1172 *
ninoderkinderen 0:8d87bc453349 1173 * @param netif the lwip network interface on which to send the request
ninoderkinderen 0:8d87bc453349 1174 * @param ipaddr the IP address for which to ask
ninoderkinderen 0:8d87bc453349 1175 * @return ERR_OK if the request has been sent
ninoderkinderen 0:8d87bc453349 1176 * ERR_MEM if the ARP packet couldn't be allocated
ninoderkinderen 0:8d87bc453349 1177 * any other err_t on failure
ninoderkinderen 0:8d87bc453349 1178 */
ninoderkinderen 0:8d87bc453349 1179 err_t
ninoderkinderen 0:8d87bc453349 1180 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
ninoderkinderen 0:8d87bc453349 1181 {
ninoderkinderen 0:8d87bc453349 1182 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
ninoderkinderen 0:8d87bc453349 1183 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
ninoderkinderen 0:8d87bc453349 1184 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
ninoderkinderen 0:8d87bc453349 1185 ipaddr, ARP_REQUEST);
ninoderkinderen 0:8d87bc453349 1186 }
ninoderkinderen 0:8d87bc453349 1187 #endif /* LWIP_ARP */
ninoderkinderen 0:8d87bc453349 1188
ninoderkinderen 0:8d87bc453349 1189 /**
ninoderkinderen 0:8d87bc453349 1190 * Process received ethernet frames. Using this function instead of directly
ninoderkinderen 0:8d87bc453349 1191 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
ninoderkinderen 0:8d87bc453349 1192 * the ARP cache is protected from concurrent access.
ninoderkinderen 0:8d87bc453349 1193 *
ninoderkinderen 0:8d87bc453349 1194 * @param p the recevied packet, p->payload pointing to the ethernet header
ninoderkinderen 0:8d87bc453349 1195 * @param netif the network interface on which the packet was received
ninoderkinderen 0:8d87bc453349 1196 */
ninoderkinderen 0:8d87bc453349 1197 err_t
ninoderkinderen 0:8d87bc453349 1198 ethernet_input(struct pbuf *p, struct netif *netif)
ninoderkinderen 0:8d87bc453349 1199 {
ninoderkinderen 0:8d87bc453349 1200 struct eth_hdr* ethhdr;
ninoderkinderen 0:8d87bc453349 1201 u16_t type;
ninoderkinderen 0:8d87bc453349 1202
ninoderkinderen 0:8d87bc453349 1203 /* points to packet payload, which starts with an Ethernet header */
ninoderkinderen 0:8d87bc453349 1204 ethhdr = (struct eth_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 1205 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
ninoderkinderen 0:8d87bc453349 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",
ninoderkinderen 0:8d87bc453349 1207 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
ninoderkinderen 0:8d87bc453349 1208 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
ninoderkinderen 0:8d87bc453349 1209 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
ninoderkinderen 0:8d87bc453349 1210 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
ninoderkinderen 0:8d87bc453349 1211 (unsigned)htons(ethhdr->type)));
ninoderkinderen 0:8d87bc453349 1212
ninoderkinderen 0:8d87bc453349 1213 type = ethhdr->type;
ninoderkinderen 0:8d87bc453349 1214 #if ETHARP_SUPPORT_VLAN
ninoderkinderen 0:8d87bc453349 1215 if (type == PP_HTONS(ETHTYPE_VLAN)) {
ninoderkinderen 0:8d87bc453349 1216 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
ninoderkinderen 0:8d87bc453349 1217 #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
ninoderkinderen 0:8d87bc453349 1218 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
ninoderkinderen 0:8d87bc453349 1219 /* silently ignore this packet: not for our VLAN */
ninoderkinderen 0:8d87bc453349 1220 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 1221 return ERR_OK;
ninoderkinderen 0:8d87bc453349 1222 }
ninoderkinderen 0:8d87bc453349 1223 #endif /* ETHARP_VLAN_CHECK */
ninoderkinderen 0:8d87bc453349 1224 type = vlan->tpid;
ninoderkinderen 0:8d87bc453349 1225 }
ninoderkinderen 0:8d87bc453349 1226 #endif /* ETHARP_SUPPORT_VLAN */
ninoderkinderen 0:8d87bc453349 1227
ninoderkinderen 0:8d87bc453349 1228 #if LWIP_ARP_FILTER_NETIF
ninoderkinderen 0:8d87bc453349 1229 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
ninoderkinderen 0:8d87bc453349 1230 #endif /* LWIP_ARP_FILTER_NETIF*/
ninoderkinderen 0:8d87bc453349 1231
ninoderkinderen 0:8d87bc453349 1232 switch (type) {
ninoderkinderen 0:8d87bc453349 1233 #if LWIP_ARP
ninoderkinderen 0:8d87bc453349 1234 /* IP packet? */
ninoderkinderen 0:8d87bc453349 1235 case PP_HTONS(ETHTYPE_IP):
ninoderkinderen 0:8d87bc453349 1236 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
ninoderkinderen 0:8d87bc453349 1237 goto free_and_return;
ninoderkinderen 0:8d87bc453349 1238 }
ninoderkinderen 0:8d87bc453349 1239 #if ETHARP_TRUST_IP_MAC
ninoderkinderen 0:8d87bc453349 1240 /* update ARP table */
ninoderkinderen 0:8d87bc453349 1241 etharp_ip_input(netif, p);
ninoderkinderen 0:8d87bc453349 1242 #endif /* ETHARP_TRUST_IP_MAC */
ninoderkinderen 0:8d87bc453349 1243 /* skip Ethernet header */
ninoderkinderen 0:8d87bc453349 1244 if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
ninoderkinderen 0:8d87bc453349 1245 LWIP_ASSERT("Can't move over header in packet", 0);
ninoderkinderen 0:8d87bc453349 1246 goto free_and_return;
ninoderkinderen 0:8d87bc453349 1247 } else {
ninoderkinderen 0:8d87bc453349 1248 /* pass to IP layer */
ninoderkinderen 0:8d87bc453349 1249 ip_input(p, netif);
ninoderkinderen 0:8d87bc453349 1250 }
ninoderkinderen 0:8d87bc453349 1251 break;
ninoderkinderen 0:8d87bc453349 1252
ninoderkinderen 0:8d87bc453349 1253 case PP_HTONS(ETHTYPE_ARP):
ninoderkinderen 0:8d87bc453349 1254 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
ninoderkinderen 0:8d87bc453349 1255 goto free_and_return;
ninoderkinderen 0:8d87bc453349 1256 }
ninoderkinderen 0:8d87bc453349 1257 /* pass p to ARP module */
ninoderkinderen 0:8d87bc453349 1258 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
ninoderkinderen 0:8d87bc453349 1259 break;
ninoderkinderen 0:8d87bc453349 1260 #endif /* LWIP_ARP */
ninoderkinderen 0:8d87bc453349 1261 #if PPPOE_SUPPORT
ninoderkinderen 0:8d87bc453349 1262 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
ninoderkinderen 0:8d87bc453349 1263 pppoe_disc_input(netif, p);
ninoderkinderen 0:8d87bc453349 1264 break;
ninoderkinderen 0:8d87bc453349 1265
ninoderkinderen 0:8d87bc453349 1266 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
ninoderkinderen 0:8d87bc453349 1267 pppoe_data_input(netif, p);
ninoderkinderen 0:8d87bc453349 1268 break;
ninoderkinderen 0:8d87bc453349 1269 #endif /* PPPOE_SUPPORT */
ninoderkinderen 0:8d87bc453349 1270
ninoderkinderen 0:8d87bc453349 1271 default:
ninoderkinderen 0:8d87bc453349 1272 ETHARP_STATS_INC(etharp.proterr);
ninoderkinderen 0:8d87bc453349 1273 ETHARP_STATS_INC(etharp.drop);
ninoderkinderen 0:8d87bc453349 1274 goto free_and_return;
ninoderkinderen 0:8d87bc453349 1275 }
ninoderkinderen 0:8d87bc453349 1276
ninoderkinderen 0:8d87bc453349 1277 /* This means the pbuf is freed or consumed,
ninoderkinderen 0:8d87bc453349 1278 so the caller doesn't have to free it again */
ninoderkinderen 0:8d87bc453349 1279 return ERR_OK;
ninoderkinderen 0:8d87bc453349 1280
ninoderkinderen 0:8d87bc453349 1281 free_and_return:
ninoderkinderen 0:8d87bc453349 1282 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 1283 return ERR_OK;
ninoderkinderen 0:8d87bc453349 1284 }
ninoderkinderen 0:8d87bc453349 1285 #endif /* LWIP_ARP || LWIP_ETHERNET */