Yasushi TAUCHI / Mbed 2 deprecated giken9_HTMLServer_Sample

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Dependencies:   EthernetInterface HttpServer TextLCD mbed-rpc mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/netif/etharp.c@2:14b689a85306, 2014-03-12 (annotated)

Committer:
yueee_yt
Date:
Wed Mar 12 04:39:15 2014 +0000
Revision:
2:14b689a85306
Parent:
0:7766f6712673 
bug fix

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yueee_yt 0:7766f6712673 1 /**
yueee_yt 0:7766f6712673 2 * @file
yueee_yt 0:7766f6712673 3 * Address Resolution Protocol module for IP over Ethernet
yueee_yt 0:7766f6712673 4 *
yueee_yt 0:7766f6712673 5 * Functionally, ARP is divided into two parts. The first maps an IP address
yueee_yt 0:7766f6712673 6 * to a physical address when sending a packet, and the second part answers
yueee_yt 0:7766f6712673 7 * requests from other machines for our physical address.
yueee_yt 0:7766f6712673 8 *
yueee_yt 0:7766f6712673 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
yueee_yt 0:7766f6712673 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
yueee_yt 0:7766f6712673 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
yueee_yt 0:7766f6712673 12 */
yueee_yt 0:7766f6712673 13
yueee_yt 0:7766f6712673 14 /*
yueee_yt 0:7766f6712673 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
yueee_yt 0:7766f6712673 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
yueee_yt 0:7766f6712673 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
yueee_yt 0:7766f6712673 18 * All rights reserved.
yueee_yt 0:7766f6712673 19 *
yueee_yt 0:7766f6712673 20 * Redistribution and use in source and binary forms, with or without modification,
yueee_yt 0:7766f6712673 21 * are permitted provided that the following conditions are met:
yueee_yt 0:7766f6712673 22 *
yueee_yt 0:7766f6712673 23 * 1. Redistributions of source code must retain the above copyright notice,
yueee_yt 0:7766f6712673 24 * this list of conditions and the following disclaimer.
yueee_yt 0:7766f6712673 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
yueee_yt 0:7766f6712673 26 * this list of conditions and the following disclaimer in the documentation
yueee_yt 0:7766f6712673 27 * and/or other materials provided with the distribution.
yueee_yt 0:7766f6712673 28 * 3. The name of the author may not be used to endorse or promote products
yueee_yt 0:7766f6712673 29 * derived from this software without specific prior written permission.
yueee_yt 0:7766f6712673 30 *
yueee_yt 0:7766f6712673 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
yueee_yt 0:7766f6712673 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
yueee_yt 0:7766f6712673 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
yueee_yt 0:7766f6712673 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
yueee_yt 0:7766f6712673 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
yueee_yt 0:7766f6712673 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
yueee_yt 0:7766f6712673 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
yueee_yt 0:7766f6712673 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
yueee_yt 0:7766f6712673 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
yueee_yt 0:7766f6712673 40 * OF SUCH DAMAGE.
yueee_yt 0:7766f6712673 41 *
yueee_yt 0:7766f6712673 42 * This file is part of the lwIP TCP/IP stack.
yueee_yt 0:7766f6712673 43 *
yueee_yt 0:7766f6712673 44 */
yueee_yt 0:7766f6712673 45
yueee_yt 0:7766f6712673 46 #include "lwip/opt.h"
yueee_yt 0:7766f6712673 47
yueee_yt 0:7766f6712673 48 #if LWIP_ARP || LWIP_ETHERNET
yueee_yt 0:7766f6712673 49
yueee_yt 0:7766f6712673 50 #include "lwip/ip_addr.h"
yueee_yt 0:7766f6712673 51 #include "lwip/def.h"
yueee_yt 0:7766f6712673 52 #include "lwip/ip.h"
yueee_yt 0:7766f6712673 53 #include "lwip/stats.h"
yueee_yt 0:7766f6712673 54 #include "lwip/snmp.h"
yueee_yt 0:7766f6712673 55 #include "lwip/dhcp.h"
yueee_yt 0:7766f6712673 56 #include "lwip/autoip.h"
yueee_yt 0:7766f6712673 57 #include "netif/etharp.h"
yueee_yt 0:7766f6712673 58
yueee_yt 0:7766f6712673 59 #if PPPOE_SUPPORT
yueee_yt 0:7766f6712673 60 #include "netif/ppp_oe.h"
yueee_yt 0:7766f6712673 61 #endif /* PPPOE_SUPPORT */
yueee_yt 0:7766f6712673 62
yueee_yt 0:7766f6712673 63 #include <string.h>
yueee_yt 0:7766f6712673 64
yueee_yt 0:7766f6712673 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
yueee_yt 0:7766f6712673 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
yueee_yt 0:7766f6712673 67
yueee_yt 0:7766f6712673 68 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
yueee_yt 0:7766f6712673 69
yueee_yt 0:7766f6712673 70 /** the time an ARP entry stays valid after its last update,
yueee_yt 0:7766f6712673 71 * for ARP_TMR_INTERVAL = 5000, this is
yueee_yt 0:7766f6712673 72 * (240 * 5) seconds = 20 minutes.
yueee_yt 0:7766f6712673 73 */
yueee_yt 0:7766f6712673 74 #define ARP_MAXAGE 240
yueee_yt 0:7766f6712673 75 /** the time an ARP entry stays pending after first request,
yueee_yt 0:7766f6712673 76 * for ARP_TMR_INTERVAL = 5000, this is
yueee_yt 0:7766f6712673 77 * (2 * 5) seconds = 10 seconds.
yueee_yt 0:7766f6712673 78 *
yueee_yt 0:7766f6712673 79 * @internal Keep this number at least 2, otherwise it might
yueee_yt 0:7766f6712673 80 * run out instantly if the timeout occurs directly after a request.
yueee_yt 0:7766f6712673 81 */
yueee_yt 0:7766f6712673 82 #define ARP_MAXPENDING 2
yueee_yt 0:7766f6712673 83
yueee_yt 0:7766f6712673 84 #define HWTYPE_ETHERNET 1
yueee_yt 0:7766f6712673 85
yueee_yt 0:7766f6712673 86 enum etharp_state {
yueee_yt 0:7766f6712673 87 ETHARP_STATE_EMPTY = 0,
yueee_yt 0:7766f6712673 88 ETHARP_STATE_PENDING,
yueee_yt 0:7766f6712673 89 ETHARP_STATE_STABLE
yueee_yt 0:7766f6712673 90 };
yueee_yt 0:7766f6712673 91
yueee_yt 0:7766f6712673 92 struct etharp_entry {
yueee_yt 0:7766f6712673 93 #if ARP_QUEUEING
yueee_yt 0:7766f6712673 94 /** Pointer to queue of pending outgoing packets on this ARP entry. */
yueee_yt 0:7766f6712673 95 struct etharp_q_entry *q;
yueee_yt 0:7766f6712673 96 #else /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 97 /** Pointer to a single pending outgoing packet on this ARP entry. */
yueee_yt 0:7766f6712673 98 struct pbuf *q;
yueee_yt 0:7766f6712673 99 #endif /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 100 ip_addr_t ipaddr;
yueee_yt 0:7766f6712673 101 struct eth_addr ethaddr;
yueee_yt 0:7766f6712673 102 #if LWIP_SNMP
yueee_yt 0:7766f6712673 103 struct netif *netif;
yueee_yt 0:7766f6712673 104 #endif /* LWIP_SNMP */
yueee_yt 0:7766f6712673 105 u8_t state;
yueee_yt 0:7766f6712673 106 u8_t ctime;
yueee_yt 0:7766f6712673 107 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 108 u8_t static_entry;
yueee_yt 0:7766f6712673 109 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 110 };
yueee_yt 0:7766f6712673 111
yueee_yt 0:7766f6712673 112 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
yueee_yt 0:7766f6712673 113
yueee_yt 0:7766f6712673 114 #if !LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 115 static u8_t etharp_cached_entry;
yueee_yt 0:7766f6712673 116 #endif /* !LWIP_NETIF_HWADDRHINT */
yueee_yt 0:7766f6712673 117
yueee_yt 0:7766f6712673 118 /** Try hard to create a new entry - we want the IP address to appear in
yueee_yt 0:7766f6712673 119 the cache (even if this means removing an active entry or so). */
yueee_yt 0:7766f6712673 120 #define ETHARP_FLAG_TRY_HARD 1
yueee_yt 0:7766f6712673 121 #define ETHARP_FLAG_FIND_ONLY 2
yueee_yt 0:7766f6712673 122 #define ETHARP_FLAG_STATIC_ENTRY 4
yueee_yt 0:7766f6712673 123
yueee_yt 0:7766f6712673 124 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 125 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
yueee_yt 0:7766f6712673 126 *((netif)->addr_hint) = (hint);
yueee_yt 0:7766f6712673 127 #else /* LWIP_NETIF_HWADDRHINT */
yueee_yt 0:7766f6712673 128 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
yueee_yt 0:7766f6712673 129 #endif /* LWIP_NETIF_HWADDRHINT */
yueee_yt 0:7766f6712673 130
yueee_yt 0:7766f6712673 131 static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags);
yueee_yt 0:7766f6712673 132
yueee_yt 0:7766f6712673 133
yueee_yt 0:7766f6712673 134 /* Some checks, instead of etharp_init(): */
yueee_yt 0:7766f6712673 135 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
yueee_yt 0:7766f6712673 136 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
yueee_yt 0:7766f6712673 137 #endif
yueee_yt 0:7766f6712673 138
yueee_yt 0:7766f6712673 139
yueee_yt 0:7766f6712673 140 #if ARP_QUEUEING
yueee_yt 0:7766f6712673 141 /**
yueee_yt 0:7766f6712673 142 * Free a complete queue of etharp entries
yueee_yt 0:7766f6712673 143 *
yueee_yt 0:7766f6712673 144 * @param q a qeueue of etharp_q_entry's to free
yueee_yt 0:7766f6712673 145 */
yueee_yt 0:7766f6712673 146 static void
yueee_yt 0:7766f6712673 147 free_etharp_q(struct etharp_q_entry *q)
yueee_yt 0:7766f6712673 148 {
yueee_yt 0:7766f6712673 149 struct etharp_q_entry *r;
yueee_yt 0:7766f6712673 150 LWIP_ASSERT("q != NULL", q != NULL);
yueee_yt 0:7766f6712673 151 LWIP_ASSERT("q->p != NULL", q->p != NULL);
yueee_yt 0:7766f6712673 152 while (q) {
yueee_yt 0:7766f6712673 153 r = q;
yueee_yt 0:7766f6712673 154 q = q->next;
yueee_yt 0:7766f6712673 155 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
yueee_yt 0:7766f6712673 156 pbuf_free(r->p);
yueee_yt 0:7766f6712673 157 memp_free(MEMP_ARP_QUEUE, r);
yueee_yt 0:7766f6712673 158 }
yueee_yt 0:7766f6712673 159 }
yueee_yt 0:7766f6712673 160 #else /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 161
yueee_yt 0:7766f6712673 162 /** Compatibility define: free the queued pbuf */
yueee_yt 0:7766f6712673 163 #define free_etharp_q(q) pbuf_free(q)
yueee_yt 0:7766f6712673 164
yueee_yt 0:7766f6712673 165 #endif /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 166
yueee_yt 0:7766f6712673 167 /** Clean up ARP table entries */
yueee_yt 0:7766f6712673 168 static void
yueee_yt 0:7766f6712673 169 free_entry(int i)
yueee_yt 0:7766f6712673 170 {
yueee_yt 0:7766f6712673 171 /* remove from SNMP ARP index tree */
yueee_yt 0:7766f6712673 172 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
yueee_yt 0:7766f6712673 173 /* and empty packet queue */
yueee_yt 0:7766f6712673 174 if (arp_table[i].q != NULL) {
yueee_yt 0:7766f6712673 175 /* remove all queued packets */
yueee_yt 0:7766f6712673 176 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
yueee_yt 0:7766f6712673 177 free_etharp_q(arp_table[i].q);
yueee_yt 0:7766f6712673 178 arp_table[i].q = NULL;
yueee_yt 0:7766f6712673 179 }
yueee_yt 0:7766f6712673 180 /* recycle entry for re-use */
yueee_yt 0:7766f6712673 181 arp_table[i].state = ETHARP_STATE_EMPTY;
yueee_yt 0:7766f6712673 182 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 183 arp_table[i].static_entry = 0;
yueee_yt 0:7766f6712673 184 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 185 #ifdef LWIP_DEBUG
yueee_yt 0:7766f6712673 186 /* for debugging, clean out the complete entry */
yueee_yt 0:7766f6712673 187 arp_table[i].ctime = 0;
yueee_yt 0:7766f6712673 188 #if LWIP_SNMP
yueee_yt 0:7766f6712673 189 arp_table[i].netif = NULL;
yueee_yt 0:7766f6712673 190 #endif /* LWIP_SNMP */
yueee_yt 0:7766f6712673 191 ip_addr_set_zero(&arp_table[i].ipaddr);
yueee_yt 0:7766f6712673 192 arp_table[i].ethaddr = ethzero;
yueee_yt 0:7766f6712673 193 #endif /* LWIP_DEBUG */
yueee_yt 0:7766f6712673 194 }
yueee_yt 0:7766f6712673 195
yueee_yt 0:7766f6712673 196 /**
yueee_yt 0:7766f6712673 197 * Clears expired entries in the ARP table.
yueee_yt 0:7766f6712673 198 *
yueee_yt 0:7766f6712673 199 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
yueee_yt 0:7766f6712673 200 * in order to expire entries in the ARP table.
yueee_yt 0:7766f6712673 201 */
yueee_yt 0:7766f6712673 202 void
yueee_yt 0:7766f6712673 203 etharp_tmr(void)
yueee_yt 0:7766f6712673 204 {
yueee_yt 0:7766f6712673 205 u8_t i;
yueee_yt 0:7766f6712673 206
yueee_yt 0:7766f6712673 207 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
yueee_yt 0:7766f6712673 208 /* remove expired entries from the ARP table */
yueee_yt 0:7766f6712673 209 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
yueee_yt 0:7766f6712673 210 u8_t state = arp_table[i].state;
yueee_yt 0:7766f6712673 211 if (state != ETHARP_STATE_EMPTY
yueee_yt 0:7766f6712673 212 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 213 && (arp_table[i].static_entry == 0)
yueee_yt 0:7766f6712673 214 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 215 ) {
yueee_yt 0:7766f6712673 216 arp_table[i].ctime++;
yueee_yt 0:7766f6712673 217 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
yueee_yt 0:7766f6712673 218 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
yueee_yt 0:7766f6712673 219 (arp_table[i].ctime >= ARP_MAXPENDING))) {
yueee_yt 0:7766f6712673 220 /* pending or stable entry has become old! */
yueee_yt 0:7766f6712673 221 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
yueee_yt 0:7766f6712673 222 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
yueee_yt 0:7766f6712673 223 /* clean up entries that have just been expired */
yueee_yt 0:7766f6712673 224 free_entry(i);
yueee_yt 0:7766f6712673 225 }
yueee_yt 0:7766f6712673 226 #if ARP_QUEUEING
yueee_yt 0:7766f6712673 227 /* still pending entry? (not expired) */
yueee_yt 0:7766f6712673 228 if (arp_table[i].state == ETHARP_STATE_PENDING) {
yueee_yt 0:7766f6712673 229 /* resend an ARP query here? */
yueee_yt 0:7766f6712673 230 }
yueee_yt 0:7766f6712673 231 #endif /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 232 }
yueee_yt 0:7766f6712673 233 }
yueee_yt 0:7766f6712673 234 }
yueee_yt 0:7766f6712673 235
yueee_yt 0:7766f6712673 236 /**
yueee_yt 0:7766f6712673 237 * Search the ARP table for a matching or new entry.
yueee_yt 0:7766f6712673 238 *
yueee_yt 0:7766f6712673 239 * If an IP address is given, return a pending or stable ARP entry that matches
yueee_yt 0:7766f6712673 240 * the address. If no match is found, create a new entry with this address set,
yueee_yt 0:7766f6712673 241 * but in state ETHARP_EMPTY. The caller must check and possibly change the
yueee_yt 0:7766f6712673 242 * state of the returned entry.
yueee_yt 0:7766f6712673 243 *
yueee_yt 0:7766f6712673 244 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
yueee_yt 0:7766f6712673 245 *
yueee_yt 0:7766f6712673 246 * In all cases, attempt to create new entries from an empty entry. If no
yueee_yt 0:7766f6712673 247 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
yueee_yt 0:7766f6712673 248 * old entries. Heuristic choose the least important entry for recycling.
yueee_yt 0:7766f6712673 249 *
yueee_yt 0:7766f6712673 250 * @param ipaddr IP address to find in ARP cache, or to add if not found.
yueee_yt 0:7766f6712673 251 * @param flags @see definition of ETHARP_FLAG_*
yueee_yt 0:7766f6712673 252 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
yueee_yt 0:7766f6712673 253 *
yueee_yt 0:7766f6712673 254 * @return The ARP entry index that matched or is created, ERR_MEM if no
yueee_yt 0:7766f6712673 255 * entry is found or could be recycled.
yueee_yt 0:7766f6712673 256 */
yueee_yt 0:7766f6712673 257 static s8_t
yueee_yt 0:7766f6712673 258 find_entry(ip_addr_t *ipaddr, u8_t flags)
yueee_yt 0:7766f6712673 259 {
yueee_yt 0:7766f6712673 260 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
yueee_yt 0:7766f6712673 261 s8_t empty = ARP_TABLE_SIZE;
yueee_yt 0:7766f6712673 262 u8_t i = 0, age_pending = 0, age_stable = 0;
yueee_yt 0:7766f6712673 263 /* oldest entry with packets on queue */
yueee_yt 0:7766f6712673 264 s8_t old_queue = ARP_TABLE_SIZE;
yueee_yt 0:7766f6712673 265 /* its age */
yueee_yt 0:7766f6712673 266 u8_t age_queue = 0;
yueee_yt 0:7766f6712673 267
yueee_yt 0:7766f6712673 268 /**
yueee_yt 0:7766f6712673 269 * a) do a search through the cache, remember candidates
yueee_yt 0:7766f6712673 270 * b) select candidate entry
yueee_yt 0:7766f6712673 271 * c) create new entry
yueee_yt 0:7766f6712673 272 */
yueee_yt 0:7766f6712673 273
yueee_yt 0:7766f6712673 274 /* a) in a single search sweep, do all of this
yueee_yt 0:7766f6712673 275 * 1) remember the first empty entry (if any)
yueee_yt 0:7766f6712673 276 * 2) remember the oldest stable entry (if any)
yueee_yt 0:7766f6712673 277 * 3) remember the oldest pending entry without queued packets (if any)
yueee_yt 0:7766f6712673 278 * 4) remember the oldest pending entry with queued packets (if any)
yueee_yt 0:7766f6712673 279 * 5) search for a matching IP entry, either pending or stable
yueee_yt 0:7766f6712673 280 * until 5 matches, or all entries are searched for.
yueee_yt 0:7766f6712673 281 */
yueee_yt 0:7766f6712673 282
yueee_yt 0:7766f6712673 283 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
yueee_yt 0:7766f6712673 284 u8_t state = arp_table[i].state;
yueee_yt 0:7766f6712673 285 /* no empty entry found yet and now we do find one? */
yueee_yt 0:7766f6712673 286 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
yueee_yt 0:7766f6712673 287 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
yueee_yt 0:7766f6712673 288 /* remember first empty entry */
yueee_yt 0:7766f6712673 289 empty = i;
yueee_yt 0:7766f6712673 290 } else if (state != ETHARP_STATE_EMPTY) {
yueee_yt 0:7766f6712673 291 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE",
yueee_yt 0:7766f6712673 292 state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE);
yueee_yt 0:7766f6712673 293 /* if given, does IP address match IP address in ARP entry? */
yueee_yt 0:7766f6712673 294 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
yueee_yt 0:7766f6712673 295 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
yueee_yt 0:7766f6712673 296 /* found exact IP address match, simply bail out */
yueee_yt 0:7766f6712673 297 return i;
yueee_yt 0:7766f6712673 298 }
yueee_yt 0:7766f6712673 299 /* pending entry? */
yueee_yt 0:7766f6712673 300 if (state == ETHARP_STATE_PENDING) {
yueee_yt 0:7766f6712673 301 /* pending with queued packets? */
yueee_yt 0:7766f6712673 302 if (arp_table[i].q != NULL) {
yueee_yt 0:7766f6712673 303 if (arp_table[i].ctime >= age_queue) {
yueee_yt 0:7766f6712673 304 old_queue = i;
yueee_yt 0:7766f6712673 305 age_queue = arp_table[i].ctime;
yueee_yt 0:7766f6712673 306 }
yueee_yt 0:7766f6712673 307 } else
yueee_yt 0:7766f6712673 308 /* pending without queued packets? */
yueee_yt 0:7766f6712673 309 {
yueee_yt 0:7766f6712673 310 if (arp_table[i].ctime >= age_pending) {
yueee_yt 0:7766f6712673 311 old_pending = i;
yueee_yt 0:7766f6712673 312 age_pending = arp_table[i].ctime;
yueee_yt 0:7766f6712673 313 }
yueee_yt 0:7766f6712673 314 }
yueee_yt 0:7766f6712673 315 /* stable entry? */
yueee_yt 0:7766f6712673 316 } else if (state == ETHARP_STATE_STABLE) {
yueee_yt 0:7766f6712673 317 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 318 /* don't record old_stable for static entries since they never expire */
yueee_yt 0:7766f6712673 319 if (arp_table[i].static_entry == 0)
yueee_yt 0:7766f6712673 320 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 321 {
yueee_yt 0:7766f6712673 322 /* remember entry with oldest stable entry in oldest, its age in maxtime */
yueee_yt 0:7766f6712673 323 if (arp_table[i].ctime >= age_stable) {
yueee_yt 0:7766f6712673 324 old_stable = i;
yueee_yt 0:7766f6712673 325 age_stable = arp_table[i].ctime;
yueee_yt 0:7766f6712673 326 }
yueee_yt 0:7766f6712673 327 }
yueee_yt 0:7766f6712673 328 }
yueee_yt 0:7766f6712673 329 }
yueee_yt 0:7766f6712673 330 }
yueee_yt 0:7766f6712673 331 /* { we have no match } => try to create a new entry */
yueee_yt 0:7766f6712673 332
yueee_yt 0:7766f6712673 333 /* don't create new entry, only search? */
yueee_yt 0:7766f6712673 334 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
yueee_yt 0:7766f6712673 335 /* or no empty entry found and not allowed to recycle? */
yueee_yt 0:7766f6712673 336 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
yueee_yt 0:7766f6712673 337 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
yueee_yt 0:7766f6712673 338 return (s8_t)ERR_MEM;
yueee_yt 0:7766f6712673 339 }
yueee_yt 0:7766f6712673 340
yueee_yt 0:7766f6712673 341 /* b) choose the least destructive entry to recycle:
yueee_yt 0:7766f6712673 342 * 1) empty entry
yueee_yt 0:7766f6712673 343 * 2) oldest stable entry
yueee_yt 0:7766f6712673 344 * 3) oldest pending entry without queued packets
yueee_yt 0:7766f6712673 345 * 4) oldest pending entry with queued packets
yueee_yt 0:7766f6712673 346 *
yueee_yt 0:7766f6712673 347 * { ETHARP_FLAG_TRY_HARD is set at this point }
yueee_yt 0:7766f6712673 348 */
yueee_yt 0:7766f6712673 349
yueee_yt 0:7766f6712673 350 /* 1) empty entry available? */
yueee_yt 0:7766f6712673 351 if (empty < ARP_TABLE_SIZE) {
yueee_yt 0:7766f6712673 352 i = empty;
yueee_yt 0:7766f6712673 353 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
yueee_yt 0:7766f6712673 354 } else {
yueee_yt 0:7766f6712673 355 /* 2) found recyclable stable entry? */
yueee_yt 0:7766f6712673 356 if (old_stable < ARP_TABLE_SIZE) {
yueee_yt 0:7766f6712673 357 /* recycle oldest stable*/
yueee_yt 0:7766f6712673 358 i = old_stable;
yueee_yt 0:7766f6712673 359 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
yueee_yt 0:7766f6712673 360 /* no queued packets should exist on stable entries */
yueee_yt 0:7766f6712673 361 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
yueee_yt 0:7766f6712673 362 /* 3) found recyclable pending entry without queued packets? */
yueee_yt 0:7766f6712673 363 } else if (old_pending < ARP_TABLE_SIZE) {
yueee_yt 0:7766f6712673 364 /* recycle oldest pending */
yueee_yt 0:7766f6712673 365 i = old_pending;
yueee_yt 0:7766f6712673 366 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
yueee_yt 0:7766f6712673 367 /* 4) found recyclable pending entry with queued packets? */
yueee_yt 0:7766f6712673 368 } else if (old_queue < ARP_TABLE_SIZE) {
yueee_yt 0:7766f6712673 369 /* recycle oldest pending (queued packets are free in free_entry) */
yueee_yt 0:7766f6712673 370 i = old_queue;
yueee_yt 0:7766f6712673 371 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
yueee_yt 0:7766f6712673 372 /* no empty or recyclable entries found */
yueee_yt 0:7766f6712673 373 } else {
yueee_yt 0:7766f6712673 374 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
yueee_yt 0:7766f6712673 375 return (s8_t)ERR_MEM;
yueee_yt 0:7766f6712673 376 }
yueee_yt 0:7766f6712673 377
yueee_yt 0:7766f6712673 378 /* { empty or recyclable entry found } */
yueee_yt 0:7766f6712673 379 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
yueee_yt 0:7766f6712673 380 free_entry(i);
yueee_yt 0:7766f6712673 381 }
yueee_yt 0:7766f6712673 382
yueee_yt 0:7766f6712673 383 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
yueee_yt 0:7766f6712673 384 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
yueee_yt 0:7766f6712673 385 arp_table[i].state == ETHARP_STATE_EMPTY);
yueee_yt 0:7766f6712673 386
yueee_yt 0:7766f6712673 387 /* IP address given? */
yueee_yt 0:7766f6712673 388 if (ipaddr != NULL) {
yueee_yt 0:7766f6712673 389 /* set IP address */
yueee_yt 0:7766f6712673 390 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
yueee_yt 0:7766f6712673 391 }
yueee_yt 0:7766f6712673 392 arp_table[i].ctime = 0;
yueee_yt 0:7766f6712673 393 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 394 arp_table[i].static_entry = 0;
yueee_yt 0:7766f6712673 395 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 396 return (err_t)i;
yueee_yt 0:7766f6712673 397 }
yueee_yt 0:7766f6712673 398
yueee_yt 0:7766f6712673 399 /**
yueee_yt 0:7766f6712673 400 * Send an IP packet on the network using netif->linkoutput
yueee_yt 0:7766f6712673 401 * The ethernet header is filled in before sending.
yueee_yt 0:7766f6712673 402 *
yueee_yt 0:7766f6712673 403 * @params netif the lwIP network interface on which to send the packet
yueee_yt 0:7766f6712673 404 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
yueee_yt 0:7766f6712673 405 * @params src the source MAC address to be copied into the ethernet header
yueee_yt 0:7766f6712673 406 * @params dst the destination MAC address to be copied into the ethernet header
yueee_yt 0:7766f6712673 407 * @return ERR_OK if the packet was sent, any other err_t on failure
yueee_yt 0:7766f6712673 408 */
yueee_yt 0:7766f6712673 409 static err_t
yueee_yt 0:7766f6712673 410 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
yueee_yt 0:7766f6712673 411 {
yueee_yt 0:7766f6712673 412 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
yueee_yt 0:7766f6712673 413
yueee_yt 0:7766f6712673 414 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
yueee_yt 0:7766f6712673 415 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
yueee_yt 0:7766f6712673 416 ETHADDR32_COPY(&ethhdr->dest, dst);
yueee_yt 0:7766f6712673 417 ETHADDR16_COPY(&ethhdr->src, src);
yueee_yt 0:7766f6712673 418 ethhdr->type = PP_HTONS(ETHTYPE_IP);
yueee_yt 0:7766f6712673 419 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
yueee_yt 0:7766f6712673 420 /* send the packet */
yueee_yt 0:7766f6712673 421 return netif->linkoutput(netif, p);
yueee_yt 0:7766f6712673 422 }
yueee_yt 0:7766f6712673 423
yueee_yt 0:7766f6712673 424 /**
yueee_yt 0:7766f6712673 425 * Update (or insert) a IP/MAC address pair in the ARP cache.
yueee_yt 0:7766f6712673 426 *
yueee_yt 0:7766f6712673 427 * If a pending entry is resolved, any queued packets will be sent
yueee_yt 0:7766f6712673 428 * at this point.
yueee_yt 0:7766f6712673 429 *
yueee_yt 0:7766f6712673 430 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
yueee_yt 0:7766f6712673 431 * @param ipaddr IP address of the inserted ARP entry.
yueee_yt 0:7766f6712673 432 * @param ethaddr Ethernet address of the inserted ARP entry.
yueee_yt 0:7766f6712673 433 * @param flags @see definition of ETHARP_FLAG_*
yueee_yt 0:7766f6712673 434 *
yueee_yt 0:7766f6712673 435 * @return
yueee_yt 0:7766f6712673 436 * - ERR_OK Succesfully updated ARP cache.
yueee_yt 0:7766f6712673 437 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
yueee_yt 0:7766f6712673 438 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
yueee_yt 0:7766f6712673 439 *
yueee_yt 0:7766f6712673 440 * @see pbuf_free()
yueee_yt 0:7766f6712673 441 */
yueee_yt 0:7766f6712673 442 static err_t
yueee_yt 0:7766f6712673 443 update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
yueee_yt 0:7766f6712673 444 {
yueee_yt 0:7766f6712673 445 s8_t i;
yueee_yt 0:7766f6712673 446 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
yueee_yt 0:7766f6712673 447 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
yueee_yt 0:7766f6712673 448 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
yueee_yt 0:7766f6712673 449 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
yueee_yt 0:7766f6712673 450 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
yueee_yt 0:7766f6712673 451 /* non-unicast address? */
yueee_yt 0:7766f6712673 452 if (ip_addr_isany(ipaddr) ||
yueee_yt 0:7766f6712673 453 ip_addr_isbroadcast(ipaddr, netif) ||
yueee_yt 0:7766f6712673 454 ip_addr_ismulticast(ipaddr)) {
yueee_yt 0:7766f6712673 455 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
yueee_yt 0:7766f6712673 456 return ERR_ARG;
yueee_yt 0:7766f6712673 457 }
yueee_yt 0:7766f6712673 458 /* find or create ARP entry */
yueee_yt 0:7766f6712673 459 i = find_entry(ipaddr, flags);
yueee_yt 0:7766f6712673 460 /* bail out if no entry could be found */
yueee_yt 0:7766f6712673 461 if (i < 0) {
yueee_yt 0:7766f6712673 462 return (err_t)i;
yueee_yt 0:7766f6712673 463 }
yueee_yt 0:7766f6712673 464
yueee_yt 0:7766f6712673 465 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 466 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
yueee_yt 0:7766f6712673 467 /* record static type */
yueee_yt 0:7766f6712673 468 arp_table[i].static_entry = 1;
yueee_yt 0:7766f6712673 469 }
yueee_yt 0:7766f6712673 470 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 471
yueee_yt 0:7766f6712673 472 /* mark it stable */
yueee_yt 0:7766f6712673 473 arp_table[i].state = ETHARP_STATE_STABLE;
yueee_yt 0:7766f6712673 474
yueee_yt 0:7766f6712673 475 #if LWIP_SNMP
yueee_yt 0:7766f6712673 476 /* record network interface */
yueee_yt 0:7766f6712673 477 arp_table[i].netif = netif;
yueee_yt 0:7766f6712673 478 #endif /* LWIP_SNMP */
yueee_yt 0:7766f6712673 479 /* insert in SNMP ARP index tree */
yueee_yt 0:7766f6712673 480 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
yueee_yt 0:7766f6712673 481
yueee_yt 0:7766f6712673 482 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
yueee_yt 0:7766f6712673 483 /* update address */
yueee_yt 0:7766f6712673 484 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
yueee_yt 0:7766f6712673 485 /* reset time stamp */
yueee_yt 0:7766f6712673 486 arp_table[i].ctime = 0;
yueee_yt 0:7766f6712673 487 /* this is where we will send out queued packets! */
yueee_yt 0:7766f6712673 488 #if ARP_QUEUEING
yueee_yt 0:7766f6712673 489 while (arp_table[i].q != NULL) {
yueee_yt 0:7766f6712673 490 struct pbuf *p;
yueee_yt 0:7766f6712673 491 /* remember remainder of queue */
yueee_yt 0:7766f6712673 492 struct etharp_q_entry *q = arp_table[i].q;
yueee_yt 0:7766f6712673 493 /* pop first item off the queue */
yueee_yt 0:7766f6712673 494 arp_table[i].q = q->next;
yueee_yt 0:7766f6712673 495 /* get the packet pointer */
yueee_yt 0:7766f6712673 496 p = q->p;
yueee_yt 0:7766f6712673 497 /* now queue entry can be freed */
yueee_yt 0:7766f6712673 498 memp_free(MEMP_ARP_QUEUE, q);
yueee_yt 0:7766f6712673 499 #else /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 500 if (arp_table[i].q != NULL) {
yueee_yt 0:7766f6712673 501 struct pbuf *p = arp_table[i].q;
yueee_yt 0:7766f6712673 502 arp_table[i].q = NULL;
yueee_yt 0:7766f6712673 503 #endif /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 504 /* send the queued IP packet */
yueee_yt 0:7766f6712673 505 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
yueee_yt 0:7766f6712673 506 /* free the queued IP packet */
yueee_yt 0:7766f6712673 507 pbuf_free(p);
yueee_yt 0:7766f6712673 508 }
yueee_yt 0:7766f6712673 509 return ERR_OK;
yueee_yt 0:7766f6712673 510 }
yueee_yt 0:7766f6712673 511
yueee_yt 0:7766f6712673 512 #if ETHARP_SUPPORT_STATIC_ENTRIES
yueee_yt 0:7766f6712673 513 /** Add a new static entry to the ARP table. If an entry exists for the
yueee_yt 0:7766f6712673 514 * specified IP address, this entry is overwritten.
yueee_yt 0:7766f6712673 515 * If packets are queued for the specified IP address, they are sent out.
yueee_yt 0:7766f6712673 516 *
yueee_yt 0:7766f6712673 517 * @param ipaddr IP address for the new static entry
yueee_yt 0:7766f6712673 518 * @param ethaddr ethernet address for the new static entry
yueee_yt 0:7766f6712673 519 * @return @see return values of etharp_add_static_entry
yueee_yt 0:7766f6712673 520 */
yueee_yt 0:7766f6712673 521 err_t
yueee_yt 0:7766f6712673 522 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
yueee_yt 0:7766f6712673 523 {
yueee_yt 0:7766f6712673 524 struct netif *netif;
yueee_yt 0:7766f6712673 525 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_add_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
yueee_yt 0:7766f6712673 526 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
yueee_yt 0:7766f6712673 527 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
yueee_yt 0:7766f6712673 528 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
yueee_yt 0:7766f6712673 529
yueee_yt 0:7766f6712673 530 netif = ip_route(ipaddr);
yueee_yt 0:7766f6712673 531 if (netif == NULL) {
yueee_yt 0:7766f6712673 532 return ERR_RTE;
yueee_yt 0:7766f6712673 533 }
yueee_yt 0:7766f6712673 534
yueee_yt 0:7766f6712673 535 return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
yueee_yt 0:7766f6712673 536 }
yueee_yt 0:7766f6712673 537
yueee_yt 0:7766f6712673 538 /** Remove a static entry from the ARP table previously added with a call to
yueee_yt 0:7766f6712673 539 * etharp_add_static_entry.
yueee_yt 0:7766f6712673 540 *
yueee_yt 0:7766f6712673 541 * @param ipaddr IP address of the static entry to remove
yueee_yt 0:7766f6712673 542 * @return ERR_OK: entry removed
yueee_yt 0:7766f6712673 543 * ERR_MEM: entry wasn't found
yueee_yt 0:7766f6712673 544 * ERR_ARG: entry wasn't a static entry but a dynamic one
yueee_yt 0:7766f6712673 545 */
yueee_yt 0:7766f6712673 546 err_t
yueee_yt 0:7766f6712673 547 etharp_remove_static_entry(ip_addr_t *ipaddr)
yueee_yt 0:7766f6712673 548 {
yueee_yt 0:7766f6712673 549 s8_t i;
yueee_yt 0:7766f6712673 550 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
yueee_yt 0:7766f6712673 551 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
yueee_yt 0:7766f6712673 552
yueee_yt 0:7766f6712673 553 /* find or create ARP entry */
yueee_yt 0:7766f6712673 554 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
yueee_yt 0:7766f6712673 555 /* bail out if no entry could be found */
yueee_yt 0:7766f6712673 556 if (i < 0) {
yueee_yt 0:7766f6712673 557 return (err_t)i;
yueee_yt 0:7766f6712673 558 }
yueee_yt 0:7766f6712673 559
yueee_yt 0:7766f6712673 560 if ((arp_table[i].state != ETHARP_STATE_STABLE) ||
yueee_yt 0:7766f6712673 561 (arp_table[i].static_entry == 0)) {
yueee_yt 0:7766f6712673 562 /* entry wasn't a static entry, cannot remove it */
yueee_yt 0:7766f6712673 563 return ERR_ARG;
yueee_yt 0:7766f6712673 564 }
yueee_yt 0:7766f6712673 565 /* entry found, free it */
yueee_yt 0:7766f6712673 566 free_entry(i);
yueee_yt 0:7766f6712673 567 return ERR_OK;
yueee_yt 0:7766f6712673 568 }
yueee_yt 0:7766f6712673 569 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
yueee_yt 0:7766f6712673 570
yueee_yt 0:7766f6712673 571 /**
yueee_yt 0:7766f6712673 572 * Finds (stable) ethernet/IP address pair from ARP table
yueee_yt 0:7766f6712673 573 * using interface and IP address index.
yueee_yt 0:7766f6712673 574 * @note the addresses in the ARP table are in network order!
yueee_yt 0:7766f6712673 575 *
yueee_yt 0:7766f6712673 576 * @param netif points to interface index
yueee_yt 0:7766f6712673 577 * @param ipaddr points to the (network order) IP address index
yueee_yt 0:7766f6712673 578 * @param eth_ret points to return pointer
yueee_yt 0:7766f6712673 579 * @param ip_ret points to return pointer
yueee_yt 0:7766f6712673 580 * @return table index if found, -1 otherwise
yueee_yt 0:7766f6712673 581 */
yueee_yt 0:7766f6712673 582 s8_t
yueee_yt 0:7766f6712673 583 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
yueee_yt 0:7766f6712673 584 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
yueee_yt 0:7766f6712673 585 {
yueee_yt 0:7766f6712673 586 s8_t i;
yueee_yt 0:7766f6712673 587
yueee_yt 0:7766f6712673 588 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
yueee_yt 0:7766f6712673 589 eth_ret != NULL && ip_ret != NULL);
yueee_yt 0:7766f6712673 590
yueee_yt 0:7766f6712673 591 LWIP_UNUSED_ARG(netif);
yueee_yt 0:7766f6712673 592
yueee_yt 0:7766f6712673 593 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
yueee_yt 0:7766f6712673 594 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
yueee_yt 0:7766f6712673 595 *eth_ret = &arp_table[i].ethaddr;
yueee_yt 0:7766f6712673 596 *ip_ret = &arp_table[i].ipaddr;
yueee_yt 0:7766f6712673 597 return i;
yueee_yt 0:7766f6712673 598 }
yueee_yt 0:7766f6712673 599 return -1;
yueee_yt 0:7766f6712673 600 }
yueee_yt 0:7766f6712673 601
yueee_yt 0:7766f6712673 602 #if ETHARP_TRUST_IP_MAC
yueee_yt 0:7766f6712673 603 /**
yueee_yt 0:7766f6712673 604 * Updates the ARP table using the given IP packet.
yueee_yt 0:7766f6712673 605 *
yueee_yt 0:7766f6712673 606 * Uses the incoming IP packet's source address to update the
yueee_yt 0:7766f6712673 607 * ARP cache for the local network. The function does not alter
yueee_yt 0:7766f6712673 608 * or free the packet. This function must be called before the
yueee_yt 0:7766f6712673 609 * packet p is passed to the IP layer.
yueee_yt 0:7766f6712673 610 *
yueee_yt 0:7766f6712673 611 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
yueee_yt 0:7766f6712673 612 * @param p The IP packet that arrived on netif.
yueee_yt 0:7766f6712673 613 *
yueee_yt 0:7766f6712673 614 * @return NULL
yueee_yt 0:7766f6712673 615 *
yueee_yt 0:7766f6712673 616 * @see pbuf_free()
yueee_yt 0:7766f6712673 617 */
yueee_yt 0:7766f6712673 618 static void
yueee_yt 0:7766f6712673 619 etharp_ip_input(struct netif *netif, struct pbuf *p)
yueee_yt 0:7766f6712673 620 {
yueee_yt 0:7766f6712673 621 struct eth_hdr *ethhdr;
yueee_yt 0:7766f6712673 622 struct ip_hdr *iphdr;
yueee_yt 0:7766f6712673 623 ip_addr_t iphdr_src;
yueee_yt 0:7766f6712673 624 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
yueee_yt 0:7766f6712673 625
yueee_yt 0:7766f6712673 626 /* Only insert an entry if the source IP address of the
yueee_yt 0:7766f6712673 627 incoming IP packet comes from a host on the local network. */
yueee_yt 0:7766f6712673 628 ethhdr = (struct eth_hdr *)p->payload;
yueee_yt 0:7766f6712673 629 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
yueee_yt 0:7766f6712673 630 #if ETHARP_SUPPORT_VLAN
yueee_yt 0:7766f6712673 631 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
yueee_yt 0:7766f6712673 632 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
yueee_yt 0:7766f6712673 633 }
yueee_yt 0:7766f6712673 634 #endif /* ETHARP_SUPPORT_VLAN */
yueee_yt 0:7766f6712673 635
yueee_yt 0:7766f6712673 636 ip_addr_copy(iphdr_src, iphdr->src);
yueee_yt 0:7766f6712673 637
yueee_yt 0:7766f6712673 638 /* source is not on the local network? */
yueee_yt 0:7766f6712673 639 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
yueee_yt 0:7766f6712673 640 /* do nothing */
yueee_yt 0:7766f6712673 641 return;
yueee_yt 0:7766f6712673 642 }
yueee_yt 0:7766f6712673 643
yueee_yt 0:7766f6712673 644 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
yueee_yt 0:7766f6712673 645 /* update the source IP address in the cache, if present */
yueee_yt 0:7766f6712673 646 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
yueee_yt 0:7766f6712673 647 * back soon (for example, if the destination IP address is ours. */
yueee_yt 0:7766f6712673 648 update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
yueee_yt 0:7766f6712673 649 }
yueee_yt 0:7766f6712673 650 #endif /* ETHARP_TRUST_IP_MAC */
yueee_yt 0:7766f6712673 651
yueee_yt 0:7766f6712673 652 /**
yueee_yt 0:7766f6712673 653 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
yueee_yt 0:7766f6712673 654 * send out queued IP packets. Updates cache with snooped address pairs.
yueee_yt 0:7766f6712673 655 *
yueee_yt 0:7766f6712673 656 * Should be called for incoming ARP packets. The pbuf in the argument
yueee_yt 0:7766f6712673 657 * is freed by this function.
yueee_yt 0:7766f6712673 658 *
yueee_yt 0:7766f6712673 659 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
yueee_yt 0:7766f6712673 660 * @param ethaddr Ethernet address of netif.
yueee_yt 0:7766f6712673 661 * @param p The ARP packet that arrived on netif. Is freed by this function.
yueee_yt 0:7766f6712673 662 *
yueee_yt 0:7766f6712673 663 * @return NULL
yueee_yt 0:7766f6712673 664 *
yueee_yt 0:7766f6712673 665 * @see pbuf_free()
yueee_yt 0:7766f6712673 666 */
yueee_yt 0:7766f6712673 667 static void
yueee_yt 0:7766f6712673 668 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
yueee_yt 0:7766f6712673 669 {
yueee_yt 0:7766f6712673 670 struct etharp_hdr *hdr;
yueee_yt 0:7766f6712673 671 struct eth_hdr *ethhdr;
yueee_yt 0:7766f6712673 672 /* these are aligned properly, whereas the ARP header fields might not be */
yueee_yt 0:7766f6712673 673 ip_addr_t sipaddr, dipaddr;
yueee_yt 0:7766f6712673 674 u8_t for_us;
yueee_yt 0:7766f6712673 675 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 676 const u8_t * ethdst_hwaddr;
yueee_yt 0:7766f6712673 677 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 678
yueee_yt 0:7766f6712673 679 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
yueee_yt 0:7766f6712673 680
yueee_yt 0:7766f6712673 681 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
yueee_yt 0:7766f6712673 682 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
yueee_yt 0:7766f6712673 683 if (p->len < SIZEOF_ETHARP_PACKET) {
yueee_yt 0:7766f6712673 684 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
yueee_yt 0:7766f6712673 685 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
yueee_yt 0:7766f6712673 686 (s16_t)SIZEOF_ETHARP_PACKET));
yueee_yt 0:7766f6712673 687 ETHARP_STATS_INC(etharp.lenerr);
yueee_yt 0:7766f6712673 688 ETHARP_STATS_INC(etharp.drop);
yueee_yt 0:7766f6712673 689 pbuf_free(p);
yueee_yt 0:7766f6712673 690 return;
yueee_yt 0:7766f6712673 691 }
yueee_yt 0:7766f6712673 692
yueee_yt 0:7766f6712673 693 ethhdr = (struct eth_hdr *)p->payload;
yueee_yt 0:7766f6712673 694 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
yueee_yt 0:7766f6712673 695 #if ETHARP_SUPPORT_VLAN
yueee_yt 0:7766f6712673 696 if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
yueee_yt 0:7766f6712673 697 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
yueee_yt 0:7766f6712673 698 }
yueee_yt 0:7766f6712673 699 #endif /* ETHARP_SUPPORT_VLAN */
yueee_yt 0:7766f6712673 700
yueee_yt 0:7766f6712673 701 /* RFC 826 "Packet Reception": */
yueee_yt 0:7766f6712673 702 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
yueee_yt 0:7766f6712673 703 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
yueee_yt 0:7766f6712673 704 (hdr->protolen != sizeof(ip_addr_t)) ||
yueee_yt 0:7766f6712673 705 (hdr->proto != PP_HTONS(ETHTYPE_IP))) {
yueee_yt 0:7766f6712673 706 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
yueee_yt 0:7766f6712673 707 ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
yueee_yt 0:7766f6712673 708 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen));
yueee_yt 0:7766f6712673 709 ETHARP_STATS_INC(etharp.proterr);
yueee_yt 0:7766f6712673 710 ETHARP_STATS_INC(etharp.drop);
yueee_yt 0:7766f6712673 711 pbuf_free(p);
yueee_yt 0:7766f6712673 712 return;
yueee_yt 0:7766f6712673 713 }
yueee_yt 0:7766f6712673 714 ETHARP_STATS_INC(etharp.recv);
yueee_yt 0:7766f6712673 715
yueee_yt 0:7766f6712673 716 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 717 /* We have to check if a host already has configured our random
yueee_yt 0:7766f6712673 718 * created link local address and continously check if there is
yueee_yt 0:7766f6712673 719 * a host with this IP-address so we can detect collisions */
yueee_yt 0:7766f6712673 720 autoip_arp_reply(netif, hdr);
yueee_yt 0:7766f6712673 721 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 722
yueee_yt 0:7766f6712673 723 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
yueee_yt 0:7766f6712673 724 * structure packing (not using structure copy which breaks strict-aliasing rules). */
yueee_yt 0:7766f6712673 725 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
yueee_yt 0:7766f6712673 726 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
yueee_yt 0:7766f6712673 727
yueee_yt 0:7766f6712673 728 /* this interface is not configured? */
yueee_yt 0:7766f6712673 729 if (ip_addr_isany(&netif->ip_addr)) {
yueee_yt 0:7766f6712673 730 for_us = 0;
yueee_yt 0:7766f6712673 731 } else {
yueee_yt 0:7766f6712673 732 /* ARP packet directed to us? */
yueee_yt 0:7766f6712673 733 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
yueee_yt 0:7766f6712673 734 }
yueee_yt 0:7766f6712673 735
yueee_yt 0:7766f6712673 736 /* ARP message directed to us?
yueee_yt 0:7766f6712673 737 -> add IP address in ARP cache; assume requester wants to talk to us,
yueee_yt 0:7766f6712673 738 can result in directly sending the queued packets for this host.
yueee_yt 0:7766f6712673 739 ARP message not directed to us?
yueee_yt 0:7766f6712673 740 -> update the source IP address in the cache, if present */
yueee_yt 0:7766f6712673 741 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
yueee_yt 0:7766f6712673 742 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
yueee_yt 0:7766f6712673 743
yueee_yt 0:7766f6712673 744 /* now act on the message itself */
yueee_yt 0:7766f6712673 745 switch (hdr->opcode) {
yueee_yt 0:7766f6712673 746 /* ARP request? */
yueee_yt 0:7766f6712673 747 case PP_HTONS(ARP_REQUEST):
yueee_yt 0:7766f6712673 748 /* ARP request. If it asked for our address, we send out a
yueee_yt 0:7766f6712673 749 * reply. In any case, we time-stamp any existing ARP entry,
yueee_yt 0:7766f6712673 750 * and possiby send out an IP packet that was queued on it. */
yueee_yt 0:7766f6712673 751
yueee_yt 0:7766f6712673 752 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
yueee_yt 0:7766f6712673 753 /* ARP request for our address? */
yueee_yt 0:7766f6712673 754 if (for_us) {
yueee_yt 0:7766f6712673 755
yueee_yt 0:7766f6712673 756 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
yueee_yt 0:7766f6712673 757 /* Re-use pbuf to send ARP reply.
yueee_yt 0:7766f6712673 758 Since we are re-using an existing pbuf, we can't call etharp_raw since
yueee_yt 0:7766f6712673 759 that would allocate a new pbuf. */
yueee_yt 0:7766f6712673 760 hdr->opcode = htons(ARP_REPLY);
yueee_yt 0:7766f6712673 761
yueee_yt 0:7766f6712673 762 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
yueee_yt 0:7766f6712673 763 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
yueee_yt 0:7766f6712673 764
yueee_yt 0:7766f6712673 765 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
yueee_yt 0:7766f6712673 766 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
yueee_yt 0:7766f6712673 767 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 768 /* If we are using Link-Local, all ARP packets that contain a Link-Local
yueee_yt 0:7766f6712673 769 * 'sender IP address' MUST be sent using link-layer broadcast instead of
yueee_yt 0:7766f6712673 770 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
yueee_yt 0:7766f6712673 771 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
yueee_yt 0:7766f6712673 772 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 773
yueee_yt 0:7766f6712673 774 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
yueee_yt 0:7766f6712673 775 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 776 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
yueee_yt 0:7766f6712673 777 #else /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 778 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
yueee_yt 0:7766f6712673 779 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 780 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
yueee_yt 0:7766f6712673 781 ETHADDR16_COPY(&ethhdr->src, ethaddr);
yueee_yt 0:7766f6712673 782
yueee_yt 0:7766f6712673 783 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
yueee_yt 0:7766f6712673 784 are already correct, we tested that before */
yueee_yt 0:7766f6712673 785
yueee_yt 0:7766f6712673 786 /* return ARP reply */
yueee_yt 0:7766f6712673 787 netif->linkoutput(netif, p);
yueee_yt 0:7766f6712673 788 /* we are not configured? */
yueee_yt 0:7766f6712673 789 } else if (ip_addr_isany(&netif->ip_addr)) {
yueee_yt 0:7766f6712673 790 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
yueee_yt 0:7766f6712673 791 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
yueee_yt 0:7766f6712673 792 /* request was not directed to us */
yueee_yt 0:7766f6712673 793 } else {
yueee_yt 0:7766f6712673 794 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
yueee_yt 0:7766f6712673 795 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
yueee_yt 0:7766f6712673 796 }
yueee_yt 0:7766f6712673 797 break;
yueee_yt 0:7766f6712673 798 case PP_HTONS(ARP_REPLY):
yueee_yt 0:7766f6712673 799 /* ARP reply. We already updated the ARP cache earlier. */
yueee_yt 0:7766f6712673 800 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
yueee_yt 0:7766f6712673 801 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
yueee_yt 0:7766f6712673 802 /* DHCP wants to know about ARP replies from any host with an
yueee_yt 0:7766f6712673 803 * IP address also offered to us by the DHCP server. We do not
yueee_yt 0:7766f6712673 804 * want to take a duplicate IP address on a single network.
yueee_yt 0:7766f6712673 805 * @todo How should we handle redundant (fail-over) interfaces? */
yueee_yt 0:7766f6712673 806 dhcp_arp_reply(netif, &sipaddr);
yueee_yt 0:7766f6712673 807 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
yueee_yt 0:7766f6712673 808 break;
yueee_yt 0:7766f6712673 809 default:
yueee_yt 0:7766f6712673 810 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
yueee_yt 0:7766f6712673 811 ETHARP_STATS_INC(etharp.err);
yueee_yt 0:7766f6712673 812 break;
yueee_yt 0:7766f6712673 813 }
yueee_yt 0:7766f6712673 814 /* free ARP packet */
yueee_yt 0:7766f6712673 815 pbuf_free(p);
yueee_yt 0:7766f6712673 816 }
yueee_yt 0:7766f6712673 817
yueee_yt 0:7766f6712673 818 /**
yueee_yt 0:7766f6712673 819 * Resolve and fill-in Ethernet address header for outgoing IP packet.
yueee_yt 0:7766f6712673 820 *
yueee_yt 0:7766f6712673 821 * For IP multicast and broadcast, corresponding Ethernet addresses
yueee_yt 0:7766f6712673 822 * are selected and the packet is transmitted on the link.
yueee_yt 0:7766f6712673 823 *
yueee_yt 0:7766f6712673 824 * For unicast addresses, the packet is submitted to etharp_query(). In
yueee_yt 0:7766f6712673 825 * case the IP address is outside the local network, the IP address of
yueee_yt 0:7766f6712673 826 * the gateway is used.
yueee_yt 0:7766f6712673 827 *
yueee_yt 0:7766f6712673 828 * @param netif The lwIP network interface which the IP packet will be sent on.
yueee_yt 0:7766f6712673 829 * @param q The pbuf(s) containing the IP packet to be sent.
yueee_yt 0:7766f6712673 830 * @param ipaddr The IP address of the packet destination.
yueee_yt 0:7766f6712673 831 *
yueee_yt 0:7766f6712673 832 * @return
yueee_yt 0:7766f6712673 833 * - ERR_RTE No route to destination (no gateway to external networks),
yueee_yt 0:7766f6712673 834 * or the return type of either etharp_query() or etharp_send_ip().
yueee_yt 0:7766f6712673 835 */
yueee_yt 0:7766f6712673 836 err_t
yueee_yt 0:7766f6712673 837 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
yueee_yt 0:7766f6712673 838 {
yueee_yt 0:7766f6712673 839 struct eth_addr *dest, mcastaddr;
yueee_yt 0:7766f6712673 840
yueee_yt 0:7766f6712673 841 /* make room for Ethernet header - should not fail */
yueee_yt 0:7766f6712673 842 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
yueee_yt 0:7766f6712673 843 /* bail out */
yueee_yt 0:7766f6712673 844 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
yueee_yt 0:7766f6712673 845 ("etharp_output: could not allocate room for header.\n"));
yueee_yt 0:7766f6712673 846 LINK_STATS_INC(link.lenerr);
yueee_yt 0:7766f6712673 847 return ERR_BUF;
yueee_yt 0:7766f6712673 848 }
yueee_yt 0:7766f6712673 849
yueee_yt 0:7766f6712673 850 /* assume unresolved Ethernet address */
yueee_yt 0:7766f6712673 851 dest = NULL;
yueee_yt 0:7766f6712673 852 /* Determine on destination hardware address. Broadcasts and multicasts
yueee_yt 0:7766f6712673 853 * are special, other IP addresses are looked up in the ARP table. */
yueee_yt 0:7766f6712673 854
yueee_yt 0:7766f6712673 855 /* broadcast destination IP address? */
yueee_yt 0:7766f6712673 856 if (ip_addr_isbroadcast(ipaddr, netif)) {
yueee_yt 0:7766f6712673 857 /* broadcast on Ethernet also */
yueee_yt 0:7766f6712673 858 dest = (struct eth_addr *)&ethbroadcast;
yueee_yt 0:7766f6712673 859 /* multicast destination IP address? */
yueee_yt 0:7766f6712673 860 } else if (ip_addr_ismulticast(ipaddr)) {
yueee_yt 0:7766f6712673 861 /* Hash IP multicast address to MAC address.*/
yueee_yt 0:7766f6712673 862 mcastaddr.addr[0] = 0x01;
yueee_yt 0:7766f6712673 863 mcastaddr.addr[1] = 0x00;
yueee_yt 0:7766f6712673 864 mcastaddr.addr[2] = 0x5e;
yueee_yt 0:7766f6712673 865 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
yueee_yt 0:7766f6712673 866 mcastaddr.addr[4] = ip4_addr3(ipaddr);
yueee_yt 0:7766f6712673 867 mcastaddr.addr[5] = ip4_addr4(ipaddr);
yueee_yt 0:7766f6712673 868 /* destination Ethernet address is multicast */
yueee_yt 0:7766f6712673 869 dest = &mcastaddr;
yueee_yt 0:7766f6712673 870 /* unicast destination IP address? */
yueee_yt 0:7766f6712673 871 } else {
yueee_yt 0:7766f6712673 872 /* outside local network? */
yueee_yt 0:7766f6712673 873 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
yueee_yt 0:7766f6712673 874 !ip_addr_islinklocal(ipaddr)) {
yueee_yt 0:7766f6712673 875 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 876 struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
yueee_yt 0:7766f6712673 877 sizeof(struct eth_hdr));
yueee_yt 0:7766f6712673 878 /* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
yueee_yt 0:7766f6712673 879 a link-local source address must always be "directly to its destination
yueee_yt 0:7766f6712673 880 on the same physical link. The host MUST NOT send the packet to any
yueee_yt 0:7766f6712673 881 router for forwarding". */
yueee_yt 0:7766f6712673 882 if (!ip_addr_islinklocal(&iphdr->src))
yueee_yt 0:7766f6712673 883 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 884 {
yueee_yt 0:7766f6712673 885 /* interface has default gateway? */
yueee_yt 0:7766f6712673 886 if (!ip_addr_isany(&netif->gw)) {
yueee_yt 0:7766f6712673 887 /* send to hardware address of default gateway IP address */
yueee_yt 0:7766f6712673 888 ipaddr = &(netif->gw);
yueee_yt 0:7766f6712673 889 /* no default gateway available */
yueee_yt 0:7766f6712673 890 } else {
yueee_yt 0:7766f6712673 891 /* no route to destination error (default gateway missing) */
yueee_yt 0:7766f6712673 892 return ERR_RTE;
yueee_yt 0:7766f6712673 893 }
yueee_yt 0:7766f6712673 894 }
yueee_yt 0:7766f6712673 895 }
yueee_yt 0:7766f6712673 896 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 897 if (netif->addr_hint != NULL) {
yueee_yt 0:7766f6712673 898 /* per-pcb cached entry was given */
yueee_yt 0:7766f6712673 899 u8_t etharp_cached_entry = *(netif->addr_hint);
yueee_yt 0:7766f6712673 900 if (etharp_cached_entry < ARP_TABLE_SIZE) {
yueee_yt 0:7766f6712673 901 #endif /* LWIP_NETIF_HWADDRHINT */
yueee_yt 0:7766f6712673 902 if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
yueee_yt 0:7766f6712673 903 (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
yueee_yt 0:7766f6712673 904 /* the per-pcb-cached entry is stable and the right one! */
yueee_yt 0:7766f6712673 905 ETHARP_STATS_INC(etharp.cachehit);
yueee_yt 0:7766f6712673 906 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
yueee_yt 0:7766f6712673 907 &arp_table[etharp_cached_entry].ethaddr);
yueee_yt 0:7766f6712673 908 }
yueee_yt 0:7766f6712673 909 #if LWIP_NETIF_HWADDRHINT
yueee_yt 0:7766f6712673 910 }
yueee_yt 0:7766f6712673 911 }
yueee_yt 0:7766f6712673 912 #endif /* LWIP_NETIF_HWADDRHINT */
yueee_yt 0:7766f6712673 913 /* queue on destination Ethernet address belonging to ipaddr */
yueee_yt 0:7766f6712673 914 return etharp_query(netif, ipaddr, q);
yueee_yt 0:7766f6712673 915 }
yueee_yt 0:7766f6712673 916
yueee_yt 0:7766f6712673 917 /* continuation for multicast/broadcast destinations */
yueee_yt 0:7766f6712673 918 /* obtain source Ethernet address of the given interface */
yueee_yt 0:7766f6712673 919 /* send packet directly on the link */
yueee_yt 0:7766f6712673 920 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
yueee_yt 0:7766f6712673 921 }
yueee_yt 0:7766f6712673 922
yueee_yt 0:7766f6712673 923 /**
yueee_yt 0:7766f6712673 924 * Send an ARP request for the given IP address and/or queue a packet.
yueee_yt 0:7766f6712673 925 *
yueee_yt 0:7766f6712673 926 * If the IP address was not yet in the cache, a pending ARP cache entry
yueee_yt 0:7766f6712673 927 * is added and an ARP request is sent for the given address. The packet
yueee_yt 0:7766f6712673 928 * is queued on this entry.
yueee_yt 0:7766f6712673 929 *
yueee_yt 0:7766f6712673 930 * If the IP address was already pending in the cache, a new ARP request
yueee_yt 0:7766f6712673 931 * is sent for the given address. The packet is queued on this entry.
yueee_yt 0:7766f6712673 932 *
yueee_yt 0:7766f6712673 933 * If the IP address was already stable in the cache, and a packet is
yueee_yt 0:7766f6712673 934 * given, it is directly sent and no ARP request is sent out.
yueee_yt 0:7766f6712673 935 *
yueee_yt 0:7766f6712673 936 * If the IP address was already stable in the cache, and no packet is
yueee_yt 0:7766f6712673 937 * given, an ARP request is sent out.
yueee_yt 0:7766f6712673 938 *
yueee_yt 0:7766f6712673 939 * @param netif The lwIP network interface on which ipaddr
yueee_yt 0:7766f6712673 940 * must be queried for.
yueee_yt 0:7766f6712673 941 * @param ipaddr The IP address to be resolved.
yueee_yt 0:7766f6712673 942 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
yueee_yt 0:7766f6712673 943 * q is not freed by this function.
yueee_yt 0:7766f6712673 944 *
yueee_yt 0:7766f6712673 945 * @note q must only be ONE packet, not a packet queue!
yueee_yt 0:7766f6712673 946 *
yueee_yt 0:7766f6712673 947 * @return
yueee_yt 0:7766f6712673 948 * - ERR_BUF Could not make room for Ethernet header.
yueee_yt 0:7766f6712673 949 * - ERR_MEM Hardware address unknown, and no more ARP entries available
yueee_yt 0:7766f6712673 950 * to query for address or queue the packet.
yueee_yt 0:7766f6712673 951 * - ERR_MEM Could not queue packet due to memory shortage.
yueee_yt 0:7766f6712673 952 * - ERR_RTE No route to destination (no gateway to external networks).
yueee_yt 0:7766f6712673 953 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
yueee_yt 0:7766f6712673 954 *
yueee_yt 0:7766f6712673 955 */
yueee_yt 0:7766f6712673 956 err_t
yueee_yt 0:7766f6712673 957 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
yueee_yt 0:7766f6712673 958 {
yueee_yt 0:7766f6712673 959 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
yueee_yt 0:7766f6712673 960 err_t result = ERR_MEM;
yueee_yt 0:7766f6712673 961 s8_t i; /* ARP entry index */
yueee_yt 0:7766f6712673 962
yueee_yt 0:7766f6712673 963 /* non-unicast address? */
yueee_yt 0:7766f6712673 964 if (ip_addr_isbroadcast(ipaddr, netif) ||
yueee_yt 0:7766f6712673 965 ip_addr_ismulticast(ipaddr) ||
yueee_yt 0:7766f6712673 966 ip_addr_isany(ipaddr)) {
yueee_yt 0:7766f6712673 967 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
yueee_yt 0:7766f6712673 968 return ERR_ARG;
yueee_yt 0:7766f6712673 969 }
yueee_yt 0:7766f6712673 970
yueee_yt 0:7766f6712673 971 /* find entry in ARP cache, ask to create entry if queueing packet */
yueee_yt 0:7766f6712673 972 i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
yueee_yt 0:7766f6712673 973
yueee_yt 0:7766f6712673 974 /* could not find or create entry? */
yueee_yt 0:7766f6712673 975 if (i < 0) {
yueee_yt 0:7766f6712673 976 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
yueee_yt 0:7766f6712673 977 if (q) {
yueee_yt 0:7766f6712673 978 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
yueee_yt 0:7766f6712673 979 ETHARP_STATS_INC(etharp.memerr);
yueee_yt 0:7766f6712673 980 }
yueee_yt 0:7766f6712673 981 return (err_t)i;
yueee_yt 0:7766f6712673 982 }
yueee_yt 0:7766f6712673 983
yueee_yt 0:7766f6712673 984 /* mark a fresh entry as pending (we just sent a request) */
yueee_yt 0:7766f6712673 985 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
yueee_yt 0:7766f6712673 986 arp_table[i].state = ETHARP_STATE_PENDING;
yueee_yt 0:7766f6712673 987 }
yueee_yt 0:7766f6712673 988
yueee_yt 0:7766f6712673 989 /* { i is either a STABLE or (new or existing) PENDING entry } */
yueee_yt 0:7766f6712673 990 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
yueee_yt 0:7766f6712673 991 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
yueee_yt 0:7766f6712673 992 (arp_table[i].state == ETHARP_STATE_STABLE)));
yueee_yt 0:7766f6712673 993
yueee_yt 0:7766f6712673 994 /* do we have a pending entry? or an implicit query request? */
yueee_yt 0:7766f6712673 995 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
yueee_yt 0:7766f6712673 996 /* try to resolve it; send out ARP request */
yueee_yt 0:7766f6712673 997 result = etharp_request(netif, ipaddr);
yueee_yt 0:7766f6712673 998 if (result != ERR_OK) {
yueee_yt 0:7766f6712673 999 /* ARP request couldn't be sent */
yueee_yt 0:7766f6712673 1000 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
yueee_yt 0:7766f6712673 1001 since this failure could be temporary, and the next packet calling
yueee_yt 0:7766f6712673 1002 etharp_query again could lead to sending the queued packets. */
yueee_yt 0:7766f6712673 1003 }
yueee_yt 0:7766f6712673 1004 if (q == NULL) {
yueee_yt 0:7766f6712673 1005 return result;
yueee_yt 0:7766f6712673 1006 }
yueee_yt 0:7766f6712673 1007 }
yueee_yt 0:7766f6712673 1008
yueee_yt 0:7766f6712673 1009 /* packet given? */
yueee_yt 0:7766f6712673 1010 LWIP_ASSERT("q != NULL", q != NULL);
yueee_yt 0:7766f6712673 1011 /* stable entry? */
yueee_yt 0:7766f6712673 1012 if (arp_table[i].state == ETHARP_STATE_STABLE) {
yueee_yt 0:7766f6712673 1013 /* we have a valid IP->Ethernet address mapping */
yueee_yt 0:7766f6712673 1014 ETHARP_SET_HINT(netif, i);
yueee_yt 0:7766f6712673 1015 /* send the packet */
yueee_yt 0:7766f6712673 1016 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
yueee_yt 0:7766f6712673 1017 /* pending entry? (either just created or already pending */
yueee_yt 0:7766f6712673 1018 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
yueee_yt 0:7766f6712673 1019 /* entry is still pending, queue the given packet 'q' */
yueee_yt 0:7766f6712673 1020 struct pbuf *p;
yueee_yt 0:7766f6712673 1021 int copy_needed = 0;
yueee_yt 0:7766f6712673 1022 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
yueee_yt 0:7766f6712673 1023 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
yueee_yt 0:7766f6712673 1024 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
yueee_yt 0:7766f6712673 1025 p = q;
yueee_yt 0:7766f6712673 1026 while (p) {
yueee_yt 0:7766f6712673 1027 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
yueee_yt 0:7766f6712673 1028 if(p->type != PBUF_ROM) {
yueee_yt 0:7766f6712673 1029 copy_needed = 1;
yueee_yt 0:7766f6712673 1030 break;
yueee_yt 0:7766f6712673 1031 }
yueee_yt 0:7766f6712673 1032 p = p->next;
yueee_yt 0:7766f6712673 1033 }
yueee_yt 0:7766f6712673 1034 if(copy_needed) {
yueee_yt 0:7766f6712673 1035 /* copy the whole packet into new pbufs */
yueee_yt 0:7766f6712673 1036 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
yueee_yt 0:7766f6712673 1037 if(p != NULL) {
yueee_yt 0:7766f6712673 1038 if (pbuf_copy(p, q) != ERR_OK) {
yueee_yt 0:7766f6712673 1039 pbuf_free(p);
yueee_yt 0:7766f6712673 1040 p = NULL;
yueee_yt 0:7766f6712673 1041 }
yueee_yt 0:7766f6712673 1042 }
yueee_yt 0:7766f6712673 1043 } else {
yueee_yt 0:7766f6712673 1044 /* referencing the old pbuf is enough */
yueee_yt 0:7766f6712673 1045 p = q;
yueee_yt 0:7766f6712673 1046 pbuf_ref(p);
yueee_yt 0:7766f6712673 1047 }
yueee_yt 0:7766f6712673 1048 /* packet could be taken over? */
yueee_yt 0:7766f6712673 1049 if (p != NULL) {
yueee_yt 0:7766f6712673 1050 /* queue packet ... */
yueee_yt 0:7766f6712673 1051 #if ARP_QUEUEING
yueee_yt 0:7766f6712673 1052 struct etharp_q_entry *new_entry;
yueee_yt 0:7766f6712673 1053 /* allocate a new arp queue entry */
yueee_yt 0:7766f6712673 1054 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
yueee_yt 0:7766f6712673 1055 if (new_entry != NULL) {
yueee_yt 0:7766f6712673 1056 new_entry->next = 0;
yueee_yt 0:7766f6712673 1057 new_entry->p = p;
yueee_yt 0:7766f6712673 1058 if(arp_table[i].q != NULL) {
yueee_yt 0:7766f6712673 1059 /* queue was already existent, append the new entry to the end */
yueee_yt 0:7766f6712673 1060 struct etharp_q_entry *r;
yueee_yt 0:7766f6712673 1061 r = arp_table[i].q;
yueee_yt 0:7766f6712673 1062 while (r->next != NULL) {
yueee_yt 0:7766f6712673 1063 r = r->next;
yueee_yt 0:7766f6712673 1064 }
yueee_yt 0:7766f6712673 1065 r->next = new_entry;
yueee_yt 0:7766f6712673 1066 } else {
yueee_yt 0:7766f6712673 1067 /* queue did not exist, first item in queue */
yueee_yt 0:7766f6712673 1068 arp_table[i].q = new_entry;
yueee_yt 0:7766f6712673 1069 }
yueee_yt 0:7766f6712673 1070 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
yueee_yt 0:7766f6712673 1071 result = ERR_OK;
yueee_yt 0:7766f6712673 1072 } else {
yueee_yt 0:7766f6712673 1073 /* the pool MEMP_ARP_QUEUE is empty */
yueee_yt 0:7766f6712673 1074 pbuf_free(p);
yueee_yt 0:7766f6712673 1075 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
yueee_yt 0:7766f6712673 1076 result = ERR_MEM;
yueee_yt 0:7766f6712673 1077 }
yueee_yt 0:7766f6712673 1078 #else /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 1079 /* always queue one packet per ARP request only, freeing a previously queued packet */
yueee_yt 0:7766f6712673 1080 if (arp_table[i].q != NULL) {
yueee_yt 0:7766f6712673 1081 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: dropped previously queued packet %p for ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
yueee_yt 0:7766f6712673 1082 pbuf_free(arp_table[i].q);
yueee_yt 0:7766f6712673 1083 }
yueee_yt 0:7766f6712673 1084 arp_table[i].q = p;
yueee_yt 0:7766f6712673 1085 result = ERR_OK;
yueee_yt 0:7766f6712673 1086 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
yueee_yt 0:7766f6712673 1087 #endif /* ARP_QUEUEING */
yueee_yt 0:7766f6712673 1088 } else {
yueee_yt 0:7766f6712673 1089 ETHARP_STATS_INC(etharp.memerr);
yueee_yt 0:7766f6712673 1090 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
yueee_yt 0:7766f6712673 1091 result = ERR_MEM;
yueee_yt 0:7766f6712673 1092 }
yueee_yt 0:7766f6712673 1093 }
yueee_yt 0:7766f6712673 1094 return result;
yueee_yt 0:7766f6712673 1095 }
yueee_yt 0:7766f6712673 1096
yueee_yt 0:7766f6712673 1097 /**
yueee_yt 0:7766f6712673 1098 * Send a raw ARP packet (opcode and all addresses can be modified)
yueee_yt 0:7766f6712673 1099 *
yueee_yt 0:7766f6712673 1100 * @param netif the lwip network interface on which to send the ARP packet
yueee_yt 0:7766f6712673 1101 * @param ethsrc_addr the source MAC address for the ethernet header
yueee_yt 0:7766f6712673 1102 * @param ethdst_addr the destination MAC address for the ethernet header
yueee_yt 0:7766f6712673 1103 * @param hwsrc_addr the source MAC address for the ARP protocol header
yueee_yt 0:7766f6712673 1104 * @param ipsrc_addr the source IP address for the ARP protocol header
yueee_yt 0:7766f6712673 1105 * @param hwdst_addr the destination MAC address for the ARP protocol header
yueee_yt 0:7766f6712673 1106 * @param ipdst_addr the destination IP address for the ARP protocol header
yueee_yt 0:7766f6712673 1107 * @param opcode the type of the ARP packet
yueee_yt 0:7766f6712673 1108 * @return ERR_OK if the ARP packet has been sent
yueee_yt 0:7766f6712673 1109 * ERR_MEM if the ARP packet couldn't be allocated
yueee_yt 0:7766f6712673 1110 * any other err_t on failure
yueee_yt 0:7766f6712673 1111 */
yueee_yt 0:7766f6712673 1112 #if !LWIP_AUTOIP
yueee_yt 0:7766f6712673 1113 static
yueee_yt 0:7766f6712673 1114 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 1115 err_t
yueee_yt 0:7766f6712673 1116 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
yueee_yt 0:7766f6712673 1117 const struct eth_addr *ethdst_addr,
yueee_yt 0:7766f6712673 1118 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
yueee_yt 0:7766f6712673 1119 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
yueee_yt 0:7766f6712673 1120 const u16_t opcode)
yueee_yt 0:7766f6712673 1121 {
yueee_yt 0:7766f6712673 1122 struct pbuf *p;
yueee_yt 0:7766f6712673 1123 err_t result = ERR_OK;
yueee_yt 0:7766f6712673 1124 struct eth_hdr *ethhdr;
yueee_yt 0:7766f6712673 1125 struct etharp_hdr *hdr;
yueee_yt 0:7766f6712673 1126 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 1127 const u8_t * ethdst_hwaddr;
yueee_yt 0:7766f6712673 1128 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 1129
yueee_yt 0:7766f6712673 1130 /* allocate a pbuf for the outgoing ARP request packet */
yueee_yt 0:7766f6712673 1131 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
yueee_yt 0:7766f6712673 1132 /* could allocate a pbuf for an ARP request? */
yueee_yt 0:7766f6712673 1133 if (p == NULL) {
yueee_yt 0:7766f6712673 1134 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
yueee_yt 0:7766f6712673 1135 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
yueee_yt 0:7766f6712673 1136 ETHARP_STATS_INC(etharp.memerr);
yueee_yt 0:7766f6712673 1137 return ERR_MEM;
yueee_yt 0:7766f6712673 1138 }
yueee_yt 0:7766f6712673 1139 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
yueee_yt 0:7766f6712673 1140 (p->len >= SIZEOF_ETHARP_PACKET));
yueee_yt 0:7766f6712673 1141
yueee_yt 0:7766f6712673 1142 ethhdr = (struct eth_hdr *)p->payload;
yueee_yt 0:7766f6712673 1143 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
yueee_yt 0:7766f6712673 1144 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
yueee_yt 0:7766f6712673 1145 hdr->opcode = htons(opcode);
yueee_yt 0:7766f6712673 1146
yueee_yt 0:7766f6712673 1147 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
yueee_yt 0:7766f6712673 1148 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
yueee_yt 0:7766f6712673 1149 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 1150 /* If we are using Link-Local, all ARP packets that contain a Link-Local
yueee_yt 0:7766f6712673 1151 * 'sender IP address' MUST be sent using link-layer broadcast instead of
yueee_yt 0:7766f6712673 1152 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
yueee_yt 0:7766f6712673 1153 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
yueee_yt 0:7766f6712673 1154 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 1155 /* Write the ARP MAC-Addresses */
yueee_yt 0:7766f6712673 1156 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
yueee_yt 0:7766f6712673 1157 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
yueee_yt 0:7766f6712673 1158 /* Write the Ethernet MAC-Addresses */
yueee_yt 0:7766f6712673 1159 #if LWIP_AUTOIP
yueee_yt 0:7766f6712673 1160 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
yueee_yt 0:7766f6712673 1161 #else /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 1162 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
yueee_yt 0:7766f6712673 1163 #endif /* LWIP_AUTOIP */
yueee_yt 0:7766f6712673 1164 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
yueee_yt 0:7766f6712673 1165 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
yueee_yt 0:7766f6712673 1166 * structure packing. */
yueee_yt 0:7766f6712673 1167 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
yueee_yt 0:7766f6712673 1168 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
yueee_yt 0:7766f6712673 1169
yueee_yt 0:7766f6712673 1170 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
yueee_yt 0:7766f6712673 1171 hdr->proto = PP_HTONS(ETHTYPE_IP);
yueee_yt 0:7766f6712673 1172 /* set hwlen and protolen */
yueee_yt 0:7766f6712673 1173 hdr->hwlen = ETHARP_HWADDR_LEN;
yueee_yt 0:7766f6712673 1174 hdr->protolen = sizeof(ip_addr_t);
yueee_yt 0:7766f6712673 1175
yueee_yt 0:7766f6712673 1176 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
yueee_yt 0:7766f6712673 1177 /* send ARP query */
yueee_yt 0:7766f6712673 1178 result = netif->linkoutput(netif, p);
yueee_yt 0:7766f6712673 1179 ETHARP_STATS_INC(etharp.xmit);
yueee_yt 0:7766f6712673 1180 /* free ARP query packet */
yueee_yt 0:7766f6712673 1181 pbuf_free(p);
yueee_yt 0:7766f6712673 1182 p = NULL;
yueee_yt 0:7766f6712673 1183 /* could not allocate pbuf for ARP request */
yueee_yt 0:7766f6712673 1184
yueee_yt 0:7766f6712673 1185 return result;
yueee_yt 0:7766f6712673 1186 }
yueee_yt 0:7766f6712673 1187
yueee_yt 0:7766f6712673 1188 /**
yueee_yt 0:7766f6712673 1189 * Send an ARP request packet asking for ipaddr.
yueee_yt 0:7766f6712673 1190 *
yueee_yt 0:7766f6712673 1191 * @param netif the lwip network interface on which to send the request
yueee_yt 0:7766f6712673 1192 * @param ipaddr the IP address for which to ask
yueee_yt 0:7766f6712673 1193 * @return ERR_OK if the request has been sent
yueee_yt 0:7766f6712673 1194 * ERR_MEM if the ARP packet couldn't be allocated
yueee_yt 0:7766f6712673 1195 * any other err_t on failure
yueee_yt 0:7766f6712673 1196 */
yueee_yt 0:7766f6712673 1197 err_t
yueee_yt 0:7766f6712673 1198 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
yueee_yt 0:7766f6712673 1199 {
yueee_yt 0:7766f6712673 1200 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
yueee_yt 0:7766f6712673 1201 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
yueee_yt 0:7766f6712673 1202 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
yueee_yt 0:7766f6712673 1203 ipaddr, ARP_REQUEST);
yueee_yt 0:7766f6712673 1204 }
yueee_yt 0:7766f6712673 1205 #endif /* LWIP_ARP */
yueee_yt 0:7766f6712673 1206
yueee_yt 0:7766f6712673 1207 /**
yueee_yt 0:7766f6712673 1208 * Process received ethernet frames. Using this function instead of directly
yueee_yt 0:7766f6712673 1209 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
yueee_yt 0:7766f6712673 1210 * the ARP cache is protected from concurrent access.
yueee_yt 0:7766f6712673 1211 *
yueee_yt 0:7766f6712673 1212 * @param p the recevied packet, p->payload pointing to the ethernet header
yueee_yt 0:7766f6712673 1213 * @param netif the network interface on which the packet was received
yueee_yt 0:7766f6712673 1214 */
yueee_yt 0:7766f6712673 1215 err_t
yueee_yt 0:7766f6712673 1216 ethernet_input(struct pbuf *p, struct netif *netif)
yueee_yt 0:7766f6712673 1217 {
yueee_yt 0:7766f6712673 1218 struct eth_hdr* ethhdr;
yueee_yt 0:7766f6712673 1219 u16_t type;
yueee_yt 0:7766f6712673 1220 s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
yueee_yt 0:7766f6712673 1221
yueee_yt 0:7766f6712673 1222 if (p->len <= SIZEOF_ETH_HDR) {
yueee_yt 0:7766f6712673 1223 /* a packet with only an ethernet header (or less) is not valid for us */
yueee_yt 0:7766f6712673 1224 ETHARP_STATS_INC(etharp.proterr);
yueee_yt 0:7766f6712673 1225 ETHARP_STATS_INC(etharp.drop);
yueee_yt 0:7766f6712673 1226 goto free_and_return;
yueee_yt 0:7766f6712673 1227 }
yueee_yt 0:7766f6712673 1228
yueee_yt 0:7766f6712673 1229 /* points to packet payload, which starts with an Ethernet header */
yueee_yt 0:7766f6712673 1230 ethhdr = (struct eth_hdr *)p->payload;
yueee_yt 0:7766f6712673 1231 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
yueee_yt 0:7766f6712673 1232 ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
yueee_yt 0:7766f6712673 1233 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
yueee_yt 0:7766f6712673 1234 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
yueee_yt 0:7766f6712673 1235 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
yueee_yt 0:7766f6712673 1236 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
yueee_yt 0:7766f6712673 1237 (unsigned)htons(ethhdr->type)));
yueee_yt 0:7766f6712673 1238
yueee_yt 0:7766f6712673 1239 type = ethhdr->type;
yueee_yt 0:7766f6712673 1240 #if ETHARP_SUPPORT_VLAN
yueee_yt 0:7766f6712673 1241 if (type == PP_HTONS(ETHTYPE_VLAN)) {
yueee_yt 0:7766f6712673 1242 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
yueee_yt 0:7766f6712673 1243 if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
yueee_yt 0:7766f6712673 1244 /* a packet with only an ethernet/vlan header (or less) is not valid for us */
yueee_yt 0:7766f6712673 1245 ETHARP_STATS_INC(etharp.proterr);
yueee_yt 0:7766f6712673 1246 ETHARP_STATS_INC(etharp.drop);
yueee_yt 0:7766f6712673 1247 goto free_and_return;
yueee_yt 0:7766f6712673 1248 }
yueee_yt 0:7766f6712673 1249 #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
yueee_yt 0:7766f6712673 1250 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
yueee_yt 0:7766f6712673 1251 /* silently ignore this packet: not for our VLAN */
yueee_yt 0:7766f6712673 1252 pbuf_free(p);
yueee_yt 0:7766f6712673 1253 return ERR_OK;
yueee_yt 0:7766f6712673 1254 }
yueee_yt 0:7766f6712673 1255 #endif /* ETHARP_VLAN_CHECK */
yueee_yt 0:7766f6712673 1256 type = vlan->tpid;
yueee_yt 0:7766f6712673 1257 ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
yueee_yt 0:7766f6712673 1258 }
yueee_yt 0:7766f6712673 1259 #endif /* ETHARP_SUPPORT_VLAN */
yueee_yt 0:7766f6712673 1260
yueee_yt 0:7766f6712673 1261 #if LWIP_ARP_FILTER_NETIF
yueee_yt 0:7766f6712673 1262 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
yueee_yt 0:7766f6712673 1263 #endif /* LWIP_ARP_FILTER_NETIF*/
yueee_yt 0:7766f6712673 1264
yueee_yt 0:7766f6712673 1265 switch (type) {
yueee_yt 0:7766f6712673 1266 #if LWIP_ARP
yueee_yt 0:7766f6712673 1267 /* IP packet? */
yueee_yt 0:7766f6712673 1268 case PP_HTONS(ETHTYPE_IP):
yueee_yt 0:7766f6712673 1269 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
yueee_yt 0:7766f6712673 1270 goto free_and_return;
yueee_yt 0:7766f6712673 1271 }
yueee_yt 0:7766f6712673 1272 #if ETHARP_TRUST_IP_MAC
yueee_yt 0:7766f6712673 1273 /* update ARP table */
yueee_yt 0:7766f6712673 1274 etharp_ip_input(netif, p);
yueee_yt 0:7766f6712673 1275 #endif /* ETHARP_TRUST_IP_MAC */
yueee_yt 0:7766f6712673 1276 /* skip Ethernet header */
yueee_yt 0:7766f6712673 1277 if(pbuf_header(p, -ip_hdr_offset)) {
yueee_yt 0:7766f6712673 1278 LWIP_ASSERT("Can't move over header in packet", 0);
yueee_yt 0:7766f6712673 1279 goto free_and_return;
yueee_yt 0:7766f6712673 1280 } else {
yueee_yt 0:7766f6712673 1281 /* pass to IP layer */
yueee_yt 0:7766f6712673 1282 ip_input(p, netif);
yueee_yt 0:7766f6712673 1283 }
yueee_yt 0:7766f6712673 1284 break;
yueee_yt 0:7766f6712673 1285
yueee_yt 0:7766f6712673 1286 case PP_HTONS(ETHTYPE_ARP):
yueee_yt 0:7766f6712673 1287 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
yueee_yt 0:7766f6712673 1288 goto free_and_return;
yueee_yt 0:7766f6712673 1289 }
yueee_yt 0:7766f6712673 1290 /* pass p to ARP module */
yueee_yt 0:7766f6712673 1291 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
yueee_yt 0:7766f6712673 1292 break;
yueee_yt 0:7766f6712673 1293 #endif /* LWIP_ARP */
yueee_yt 0:7766f6712673 1294 #if PPPOE_SUPPORT
yueee_yt 0:7766f6712673 1295 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
yueee_yt 0:7766f6712673 1296 pppoe_disc_input(netif, p);
yueee_yt 0:7766f6712673 1297 break;
yueee_yt 0:7766f6712673 1298
yueee_yt 0:7766f6712673 1299 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
yueee_yt 0:7766f6712673 1300 pppoe_data_input(netif, p);
yueee_yt 0:7766f6712673 1301 break;
yueee_yt 0:7766f6712673 1302 #endif /* PPPOE_SUPPORT */
yueee_yt 0:7766f6712673 1303
yueee_yt 0:7766f6712673 1304 default:
yueee_yt 0:7766f6712673 1305 ETHARP_STATS_INC(etharp.proterr);
yueee_yt 0:7766f6712673 1306 ETHARP_STATS_INC(etharp.drop);
yueee_yt 0:7766f6712673 1307 goto free_and_return;
yueee_yt 0:7766f6712673 1308 }
yueee_yt 0:7766f6712673 1309
yueee_yt 0:7766f6712673 1310 /* This means the pbuf is freed or consumed,
yueee_yt 0:7766f6712673 1311 so the caller doesn't have to free it again */
yueee_yt 0:7766f6712673 1312 return ERR_OK;
yueee_yt 0:7766f6712673 1313
yueee_yt 0:7766f6712673 1314 free_and_return:
yueee_yt 0:7766f6712673 1315 pbuf_free(p);
yueee_yt 0:7766f6712673 1316 return ERR_OK;
yueee_yt 0:7766f6712673 1317 }
yueee_yt 0:7766f6712673 1318 #endif /* LWIP_ARP || LWIP_ETHERNET */