Yann Garcia / Mbed 2 deprecated DS130x_I2CApp

This short program illustrates how to use the DS130x_I2C library. My objective is to share the same RTC with Microchip 18F MCU.

Dependencies:   mbed DebugLibrary

NetServices/lwip/netif/etharp.c@1:995212d326ca, 2011-02-11 (annotated)

Committer:
Yann
Date:
Fri Feb 11 10:17:20 2011 +0000
Revision:
1:995212d326ca
Parent:
0:f30e2135b0db 
V0.0.0.2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Yann 0:f30e2135b0db 1 /**
Yann 0:f30e2135b0db 2 * @file
Yann 0:f30e2135b0db 3 * Address Resolution Protocol module for IP over Ethernet
Yann 0:f30e2135b0db 4 *
Yann 0:f30e2135b0db 5 * Functionally, ARP is divided into two parts. The first maps an IP address
Yann 0:f30e2135b0db 6 * to a physical address when sending a packet, and the second part answers
Yann 0:f30e2135b0db 7 * requests from other machines for our physical address.
Yann 0:f30e2135b0db 8 *
Yann 0:f30e2135b0db 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
Yann 0:f30e2135b0db 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
Yann 0:f30e2135b0db 11 * if an interface calls etharp_gratuitous(our_netif) upon address change.
Yann 0:f30e2135b0db 12 */
Yann 0:f30e2135b0db 13
Yann 0:f30e2135b0db 14 /*
Yann 0:f30e2135b0db 15 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
Yann 0:f30e2135b0db 16 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
Yann 0:f30e2135b0db 17 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
Yann 0:f30e2135b0db 18 * All rights reserved.
Yann 0:f30e2135b0db 19 *
Yann 0:f30e2135b0db 20 * Redistribution and use in source and binary forms, with or without modification,
Yann 0:f30e2135b0db 21 * are permitted provided that the following conditions are met:
Yann 0:f30e2135b0db 22 *
Yann 0:f30e2135b0db 23 * 1. Redistributions of source code must retain the above copyright notice,
Yann 0:f30e2135b0db 24 * this list of conditions and the following disclaimer.
Yann 0:f30e2135b0db 25 * 2. Redistributions in binary form must reproduce the above copyright notice,
Yann 0:f30e2135b0db 26 * this list of conditions and the following disclaimer in the documentation
Yann 0:f30e2135b0db 27 * and/or other materials provided with the distribution.
Yann 0:f30e2135b0db 28 * 3. The name of the author may not be used to endorse or promote products
Yann 0:f30e2135b0db 29 * derived from this software without specific prior written permission.
Yann 0:f30e2135b0db 30 *
Yann 0:f30e2135b0db 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Yann 0:f30e2135b0db 32 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Yann 0:f30e2135b0db 33 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Yann 0:f30e2135b0db 34 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Yann 0:f30e2135b0db 35 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Yann 0:f30e2135b0db 36 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Yann 0:f30e2135b0db 37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Yann 0:f30e2135b0db 38 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Yann 0:f30e2135b0db 39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Yann 0:f30e2135b0db 40 * OF SUCH DAMAGE.
Yann 0:f30e2135b0db 41 *
Yann 0:f30e2135b0db 42 * This file is part of the lwIP TCP/IP stack.
Yann 0:f30e2135b0db 43 *
Yann 0:f30e2135b0db 44 */
Yann 0:f30e2135b0db 45
Yann 0:f30e2135b0db 46 #include "lwip/opt.h"
Yann 0:f30e2135b0db 47
Yann 0:f30e2135b0db 48 #if LWIP_ARP || LWIP_ETHERNET
Yann 0:f30e2135b0db 49
Yann 0:f30e2135b0db 50 #include "lwip/ip_addr.h"
Yann 0:f30e2135b0db 51 #include "lwip/def.h"
Yann 0:f30e2135b0db 52 #include "lwip/ip.h"
Yann 0:f30e2135b0db 53 #include "lwip/stats.h"
Yann 0:f30e2135b0db 54 #include "lwip/snmp.h"
Yann 0:f30e2135b0db 55 #include "lwip/dhcp.h"
Yann 0:f30e2135b0db 56 #include "lwip/autoip.h"
Yann 0:f30e2135b0db 57 #include "netif/etharp.h"
Yann 0:f30e2135b0db 58
Yann 0:f30e2135b0db 59 #if PPPOE_SUPPORT
Yann 0:f30e2135b0db 60 #include "netif/ppp_oe.h"
Yann 0:f30e2135b0db 61 #endif /* PPPOE_SUPPORT */
Yann 0:f30e2135b0db 62
Yann 0:f30e2135b0db 63 #include <string.h>
Yann 0:f30e2135b0db 64
Yann 0:f30e2135b0db 65 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
Yann 0:f30e2135b0db 66 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
Yann 0:f30e2135b0db 67
Yann 0:f30e2135b0db 68 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
Yann 0:f30e2135b0db 69
Yann 0:f30e2135b0db 70 /** the time an ARP entry stays valid after its last update,
Yann 0:f30e2135b0db 71 * for ARP_TMR_INTERVAL = 5000, this is
Yann 0:f30e2135b0db 72 * (240 * 5) seconds = 20 minutes.
Yann 0:f30e2135b0db 73 */
Yann 0:f30e2135b0db 74 #define ARP_MAXAGE 240
Yann 0:f30e2135b0db 75 /** the time an ARP entry stays pending after first request,
Yann 0:f30e2135b0db 76 * for ARP_TMR_INTERVAL = 5000, this is
Yann 0:f30e2135b0db 77 * (2 * 5) seconds = 10 seconds.
Yann 0:f30e2135b0db 78 *
Yann 0:f30e2135b0db 79 * @internal Keep this number at least 2, otherwise it might
Yann 0:f30e2135b0db 80 * run out instantly if the timeout occurs directly after a request.
Yann 0:f30e2135b0db 81 */
Yann 0:f30e2135b0db 82 #define ARP_MAXPENDING 2
Yann 0:f30e2135b0db 83
Yann 0:f30e2135b0db 84 #define HWTYPE_ETHERNET 1
Yann 0:f30e2135b0db 85
Yann 0:f30e2135b0db 86 enum etharp_state {
Yann 0:f30e2135b0db 87 ETHARP_STATE_EMPTY = 0,
Yann 0:f30e2135b0db 88 ETHARP_STATE_PENDING,
Yann 0:f30e2135b0db 89 ETHARP_STATE_STABLE
Yann 0:f30e2135b0db 90 };
Yann 0:f30e2135b0db 91
Yann 0:f30e2135b0db 92 struct etharp_entry {
Yann 0:f30e2135b0db 93 #if ARP_QUEUEING
Yann 0:f30e2135b0db 94 /** Pointer to queue of pending outgoing packets on this ARP entry. */
Yann 0:f30e2135b0db 95 struct etharp_q_entry *q;
Yann 0:f30e2135b0db 96 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 97 ip_addr_t ipaddr;
Yann 0:f30e2135b0db 98 struct eth_addr ethaddr;
Yann 0:f30e2135b0db 99 #if LWIP_SNMP
Yann 0:f30e2135b0db 100 struct netif *netif;
Yann 0:f30e2135b0db 101 #endif /* LWIP_SNMP */
Yann 0:f30e2135b0db 102 u8_t state;
Yann 0:f30e2135b0db 103 u8_t ctime;
Yann 0:f30e2135b0db 104 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 105 u8_t static_entry;
Yann 0:f30e2135b0db 106 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 107 };
Yann 0:f30e2135b0db 108
Yann 0:f30e2135b0db 109 static struct etharp_entry arp_table[ARP_TABLE_SIZE];
Yann 0:f30e2135b0db 110
Yann 0:f30e2135b0db 111 #if !LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 112 static u8_t etharp_cached_entry;
Yann 0:f30e2135b0db 113 #endif /* !LWIP_NETIF_HWADDRHINT */
Yann 0:f30e2135b0db 114
Yann 0:f30e2135b0db 115 /** Try hard to create a new entry - we want the IP address to appear in
Yann 0:f30e2135b0db 116 the cache (even if this means removing an active entry or so). */
Yann 0:f30e2135b0db 117 #define ETHARP_FLAG_TRY_HARD 1
Yann 0:f30e2135b0db 118 #define ETHARP_FLAG_FIND_ONLY 2
Yann 0:f30e2135b0db 119 #define ETHARP_FLAG_STATIC_ENTRY 4
Yann 0:f30e2135b0db 120
Yann 0:f30e2135b0db 121 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 122 #define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
Yann 0:f30e2135b0db 123 *((netif)->addr_hint) = (hint);
Yann 0:f30e2135b0db 124 #else /* LWIP_NETIF_HWADDRHINT */
Yann 0:f30e2135b0db 125 #define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
Yann 0:f30e2135b0db 126 #endif /* LWIP_NETIF_HWADDRHINT */
Yann 0:f30e2135b0db 127
Yann 0:f30e2135b0db 128 static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags);
Yann 0:f30e2135b0db 129
Yann 0:f30e2135b0db 130
Yann 0:f30e2135b0db 131 /* Some checks, instead of etharp_init(): */
Yann 0:f30e2135b0db 132 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
Yann 0:f30e2135b0db 133 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
Yann 0:f30e2135b0db 134 #endif
Yann 0:f30e2135b0db 135
Yann 0:f30e2135b0db 136
Yann 0:f30e2135b0db 137 #if ARP_QUEUEING
Yann 0:f30e2135b0db 138 /**
Yann 0:f30e2135b0db 139 * Free a complete queue of etharp entries
Yann 0:f30e2135b0db 140 *
Yann 0:f30e2135b0db 141 * @param q a qeueue of etharp_q_entry's to free
Yann 0:f30e2135b0db 142 */
Yann 0:f30e2135b0db 143 static void
Yann 0:f30e2135b0db 144 free_etharp_q(struct etharp_q_entry *q)
Yann 0:f30e2135b0db 145 {
Yann 0:f30e2135b0db 146 struct etharp_q_entry *r;
Yann 0:f30e2135b0db 147 LWIP_ASSERT("q != NULL", q != NULL);
Yann 0:f30e2135b0db 148 LWIP_ASSERT("q->p != NULL", q->p != NULL);
Yann 0:f30e2135b0db 149 while (q) {
Yann 0:f30e2135b0db 150 r = q;
Yann 0:f30e2135b0db 151 q = q->next;
Yann 0:f30e2135b0db 152 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
Yann 0:f30e2135b0db 153 pbuf_free(r->p);
Yann 0:f30e2135b0db 154 memp_free(MEMP_ARP_QUEUE, r);
Yann 0:f30e2135b0db 155 }
Yann 0:f30e2135b0db 156 }
Yann 0:f30e2135b0db 157 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 158
Yann 0:f30e2135b0db 159 /** Clean up ARP table entries */
Yann 0:f30e2135b0db 160 static void
Yann 0:f30e2135b0db 161 free_entry(int i)
Yann 0:f30e2135b0db 162 {
Yann 0:f30e2135b0db 163 /* remove from SNMP ARP index tree */
Yann 0:f30e2135b0db 164 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
Yann 0:f30e2135b0db 165 #if ARP_QUEUEING
Yann 0:f30e2135b0db 166 /* and empty packet queue */
Yann 0:f30e2135b0db 167 if (arp_table[i].q != NULL) {
Yann 0:f30e2135b0db 168 /* remove all queued packets */
Yann 0:f30e2135b0db 169 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
Yann 0:f30e2135b0db 170 free_etharp_q(arp_table[i].q);
Yann 0:f30e2135b0db 171 arp_table[i].q = NULL;
Yann 0:f30e2135b0db 172 }
Yann 0:f30e2135b0db 173 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 174 /* recycle entry for re-use */
Yann 0:f30e2135b0db 175 arp_table[i].state = ETHARP_STATE_EMPTY;
Yann 0:f30e2135b0db 176 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 177 arp_table[i].static_entry = 0;
Yann 0:f30e2135b0db 178 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 179 #ifdef LWIP_DEBUG
Yann 0:f30e2135b0db 180 /* for debugging, clean out the complete entry */
Yann 0:f30e2135b0db 181 arp_table[i].ctime = 0;
Yann 0:f30e2135b0db 182 #if LWIP_SNMP
Yann 0:f30e2135b0db 183 arp_table[i].netif = NULL;
Yann 0:f30e2135b0db 184 #endif /* LWIP_SNMP */
Yann 0:f30e2135b0db 185 ip_addr_set_zero(&arp_table[i].ipaddr);
Yann 0:f30e2135b0db 186 arp_table[i].ethaddr = ethzero;
Yann 0:f30e2135b0db 187 #endif /* LWIP_DEBUG */
Yann 0:f30e2135b0db 188 }
Yann 0:f30e2135b0db 189
Yann 0:f30e2135b0db 190 /**
Yann 0:f30e2135b0db 191 * Clears expired entries in the ARP table.
Yann 0:f30e2135b0db 192 *
Yann 0:f30e2135b0db 193 * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
Yann 0:f30e2135b0db 194 * in order to expire entries in the ARP table.
Yann 0:f30e2135b0db 195 */
Yann 0:f30e2135b0db 196 void
Yann 0:f30e2135b0db 197 etharp_tmr(void)
Yann 0:f30e2135b0db 198 {
Yann 0:f30e2135b0db 199 u8_t i;
Yann 0:f30e2135b0db 200
Yann 0:f30e2135b0db 201 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
Yann 0:f30e2135b0db 202 /* remove expired entries from the ARP table */
Yann 0:f30e2135b0db 203 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
Yann 0:f30e2135b0db 204 u8_t state = arp_table[i].state;
Yann 0:f30e2135b0db 205 if (state != ETHARP_STATE_EMPTY
Yann 0:f30e2135b0db 206 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 207 && (arp_table[i].static_entry == 0)
Yann 0:f30e2135b0db 208 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 209 ) {
Yann 0:f30e2135b0db 210 arp_table[i].ctime++;
Yann 0:f30e2135b0db 211 if ((arp_table[i].ctime >= ARP_MAXAGE) ||
Yann 0:f30e2135b0db 212 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
Yann 0:f30e2135b0db 213 (arp_table[i].ctime >= ARP_MAXPENDING))) {
Yann 0:f30e2135b0db 214 /* pending or stable entry has become old! */
Yann 0:f30e2135b0db 215 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
Yann 0:f30e2135b0db 216 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
Yann 0:f30e2135b0db 217 /* clean up entries that have just been expired */
Yann 0:f30e2135b0db 218 free_entry(i);
Yann 0:f30e2135b0db 219 }
Yann 0:f30e2135b0db 220 #if ARP_QUEUEING
Yann 0:f30e2135b0db 221 /* still pending entry? (not expired) */
Yann 0:f30e2135b0db 222 if (arp_table[i].state == ETHARP_STATE_PENDING) {
Yann 0:f30e2135b0db 223 /* resend an ARP query here? */
Yann 0:f30e2135b0db 224 }
Yann 0:f30e2135b0db 225 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 226 }
Yann 0:f30e2135b0db 227 }
Yann 0:f30e2135b0db 228 }
Yann 0:f30e2135b0db 229
Yann 0:f30e2135b0db 230 /**
Yann 0:f30e2135b0db 231 * Search the ARP table for a matching or new entry.
Yann 0:f30e2135b0db 232 *
Yann 0:f30e2135b0db 233 * If an IP address is given, return a pending or stable ARP entry that matches
Yann 0:f30e2135b0db 234 * the address. If no match is found, create a new entry with this address set,
Yann 0:f30e2135b0db 235 * but in state ETHARP_EMPTY. The caller must check and possibly change the
Yann 0:f30e2135b0db 236 * state of the returned entry.
Yann 0:f30e2135b0db 237 *
Yann 0:f30e2135b0db 238 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
Yann 0:f30e2135b0db 239 *
Yann 0:f30e2135b0db 240 * In all cases, attempt to create new entries from an empty entry. If no
Yann 0:f30e2135b0db 241 * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
Yann 0:f30e2135b0db 242 * old entries. Heuristic choose the least important entry for recycling.
Yann 0:f30e2135b0db 243 *
Yann 0:f30e2135b0db 244 * @param ipaddr IP address to find in ARP cache, or to add if not found.
Yann 0:f30e2135b0db 245 * @param flags @see definition of ETHARP_FLAG_*
Yann 0:f30e2135b0db 246 * @param netif netif related to this address (used for NETIF_HWADDRHINT)
Yann 0:f30e2135b0db 247 *
Yann 0:f30e2135b0db 248 * @return The ARP entry index that matched or is created, ERR_MEM if no
Yann 0:f30e2135b0db 249 * entry is found or could be recycled.
Yann 0:f30e2135b0db 250 */
Yann 0:f30e2135b0db 251 static s8_t
Yann 0:f30e2135b0db 252 find_entry(ip_addr_t *ipaddr, u8_t flags)
Yann 0:f30e2135b0db 253 {
Yann 0:f30e2135b0db 254 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
Yann 0:f30e2135b0db 255 s8_t empty = ARP_TABLE_SIZE;
Yann 0:f30e2135b0db 256 u8_t i = 0, age_pending = 0, age_stable = 0;
Yann 0:f30e2135b0db 257 #if ARP_QUEUEING
Yann 0:f30e2135b0db 258 /* oldest entry with packets on queue */
Yann 0:f30e2135b0db 259 s8_t old_queue = ARP_TABLE_SIZE;
Yann 0:f30e2135b0db 260 /* its age */
Yann 0:f30e2135b0db 261 u8_t age_queue = 0;
Yann 0:f30e2135b0db 262 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 263
Yann 0:f30e2135b0db 264 /**
Yann 0:f30e2135b0db 265 * a) do a search through the cache, remember candidates
Yann 0:f30e2135b0db 266 * b) select candidate entry
Yann 0:f30e2135b0db 267 * c) create new entry
Yann 0:f30e2135b0db 268 */
Yann 0:f30e2135b0db 269
Yann 0:f30e2135b0db 270 /* a) in a single search sweep, do all of this
Yann 0:f30e2135b0db 271 * 1) remember the first empty entry (if any)
Yann 0:f30e2135b0db 272 * 2) remember the oldest stable entry (if any)
Yann 0:f30e2135b0db 273 * 3) remember the oldest pending entry without queued packets (if any)
Yann 0:f30e2135b0db 274 * 4) remember the oldest pending entry with queued packets (if any)
Yann 0:f30e2135b0db 275 * 5) search for a matching IP entry, either pending or stable
Yann 0:f30e2135b0db 276 * until 5 matches, or all entries are searched for.
Yann 0:f30e2135b0db 277 */
Yann 0:f30e2135b0db 278
Yann 0:f30e2135b0db 279 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
Yann 0:f30e2135b0db 280 u8_t state = arp_table[i].state;
Yann 0:f30e2135b0db 281 /* no empty entry found yet and now we do find one? */
Yann 0:f30e2135b0db 282 if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
Yann 0:f30e2135b0db 283 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
Yann 0:f30e2135b0db 284 /* remember first empty entry */
Yann 0:f30e2135b0db 285 empty = i;
Yann 0:f30e2135b0db 286 } else if (state != ETHARP_STATE_EMPTY) {
Yann 0:f30e2135b0db 287 LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE",
Yann 0:f30e2135b0db 288 state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE);
Yann 0:f30e2135b0db 289 /* if given, does IP address match IP address in ARP entry? */
Yann 0:f30e2135b0db 290 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
Yann 0:f30e2135b0db 291 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
Yann 0:f30e2135b0db 292 /* found exact IP address match, simply bail out */
Yann 0:f30e2135b0db 293 return i;
Yann 0:f30e2135b0db 294 }
Yann 0:f30e2135b0db 295 /* pending entry? */
Yann 0:f30e2135b0db 296 if (state == ETHARP_STATE_PENDING) {
Yann 0:f30e2135b0db 297 /* pending with queued packets? */
Yann 0:f30e2135b0db 298 #if ARP_QUEUEING
Yann 0:f30e2135b0db 299 if (arp_table[i].q != NULL) {
Yann 0:f30e2135b0db 300 if (arp_table[i].ctime >= age_queue) {
Yann 0:f30e2135b0db 301 old_queue = i;
Yann 0:f30e2135b0db 302 age_queue = arp_table[i].ctime;
Yann 0:f30e2135b0db 303 }
Yann 0:f30e2135b0db 304 } else
Yann 0:f30e2135b0db 305 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 306 /* pending without queued packets? */
Yann 0:f30e2135b0db 307 {
Yann 0:f30e2135b0db 308 if (arp_table[i].ctime >= age_pending) {
Yann 0:f30e2135b0db 309 old_pending = i;
Yann 0:f30e2135b0db 310 age_pending = arp_table[i].ctime;
Yann 0:f30e2135b0db 311 }
Yann 0:f30e2135b0db 312 }
Yann 0:f30e2135b0db 313 /* stable entry? */
Yann 0:f30e2135b0db 314 } else if (state == ETHARP_STATE_STABLE) {
Yann 0:f30e2135b0db 315 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 316 /* don't record old_stable for static entries since they never expire */
Yann 0:f30e2135b0db 317 if (arp_table[i].static_entry == 0)
Yann 0:f30e2135b0db 318 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 319 {
Yann 0:f30e2135b0db 320 /* remember entry with oldest stable entry in oldest, its age in maxtime */
Yann 0:f30e2135b0db 321 if (arp_table[i].ctime >= age_stable) {
Yann 0:f30e2135b0db 322 old_stable = i;
Yann 0:f30e2135b0db 323 age_stable = arp_table[i].ctime;
Yann 0:f30e2135b0db 324 }
Yann 0:f30e2135b0db 325 }
Yann 0:f30e2135b0db 326 }
Yann 0:f30e2135b0db 327 }
Yann 0:f30e2135b0db 328 }
Yann 0:f30e2135b0db 329 /* { we have no match } => try to create a new entry */
Yann 0:f30e2135b0db 330
Yann 0:f30e2135b0db 331 /* don't create new entry, only search? */
Yann 0:f30e2135b0db 332 if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
Yann 0:f30e2135b0db 333 /* or no empty entry found and not allowed to recycle? */
Yann 0:f30e2135b0db 334 ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
Yann 0:f30e2135b0db 335 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
Yann 0:f30e2135b0db 336 return (s8_t)ERR_MEM;
Yann 0:f30e2135b0db 337 }
Yann 0:f30e2135b0db 338
Yann 0:f30e2135b0db 339 /* b) choose the least destructive entry to recycle:
Yann 0:f30e2135b0db 340 * 1) empty entry
Yann 0:f30e2135b0db 341 * 2) oldest stable entry
Yann 0:f30e2135b0db 342 * 3) oldest pending entry without queued packets
Yann 0:f30e2135b0db 343 * 4) oldest pending entry with queued packets
Yann 0:f30e2135b0db 344 *
Yann 0:f30e2135b0db 345 * { ETHARP_FLAG_TRY_HARD is set at this point }
Yann 0:f30e2135b0db 346 */
Yann 0:f30e2135b0db 347
Yann 0:f30e2135b0db 348 /* 1) empty entry available? */
Yann 0:f30e2135b0db 349 if (empty < ARP_TABLE_SIZE) {
Yann 0:f30e2135b0db 350 i = empty;
Yann 0:f30e2135b0db 351 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
Yann 0:f30e2135b0db 352 } else {
Yann 0:f30e2135b0db 353 /* 2) found recyclable stable entry? */
Yann 0:f30e2135b0db 354 if (old_stable < ARP_TABLE_SIZE) {
Yann 0:f30e2135b0db 355 /* recycle oldest stable*/
Yann 0:f30e2135b0db 356 i = old_stable;
Yann 0:f30e2135b0db 357 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
Yann 0:f30e2135b0db 358 #if ARP_QUEUEING
Yann 0:f30e2135b0db 359 /* no queued packets should exist on stable entries */
Yann 0:f30e2135b0db 360 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
Yann 0:f30e2135b0db 361 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 362 /* 3) found recyclable pending entry without queued packets? */
Yann 0:f30e2135b0db 363 } else if (old_pending < ARP_TABLE_SIZE) {
Yann 0:f30e2135b0db 364 /* recycle oldest pending */
Yann 0:f30e2135b0db 365 i = old_pending;
Yann 0:f30e2135b0db 366 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
Yann 0:f30e2135b0db 367 #if ARP_QUEUEING
Yann 0:f30e2135b0db 368 /* 4) found recyclable pending entry with queued packets? */
Yann 0:f30e2135b0db 369 } else if (old_queue < ARP_TABLE_SIZE) {
Yann 0:f30e2135b0db 370 /* recycle oldest pending (queued packets are free in free_entry) */
Yann 0:f30e2135b0db 371 i = old_queue;
Yann 0:f30e2135b0db 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)));
Yann 0:f30e2135b0db 373 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 374 /* no empty or recyclable entries found */
Yann 0:f30e2135b0db 375 } else {
Yann 0:f30e2135b0db 376 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
Yann 0:f30e2135b0db 377 return (s8_t)ERR_MEM;
Yann 0:f30e2135b0db 378 }
Yann 0:f30e2135b0db 379
Yann 0:f30e2135b0db 380 /* { empty or recyclable entry found } */
Yann 0:f30e2135b0db 381 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
Yann 0:f30e2135b0db 382 free_entry(i);
Yann 0:f30e2135b0db 383 }
Yann 0:f30e2135b0db 384
Yann 0:f30e2135b0db 385 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
Yann 0:f30e2135b0db 386 LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
Yann 0:f30e2135b0db 387 arp_table[i].state == ETHARP_STATE_EMPTY);
Yann 0:f30e2135b0db 388
Yann 0:f30e2135b0db 389 /* IP address given? */
Yann 0:f30e2135b0db 390 if (ipaddr != NULL) {
Yann 0:f30e2135b0db 391 /* set IP address */
Yann 0:f30e2135b0db 392 ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
Yann 0:f30e2135b0db 393 }
Yann 0:f30e2135b0db 394 arp_table[i].ctime = 0;
Yann 0:f30e2135b0db 395 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 396 arp_table[i].static_entry = 0;
Yann 0:f30e2135b0db 397 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 398 return (err_t)i;
Yann 0:f30e2135b0db 399 }
Yann 0:f30e2135b0db 400
Yann 0:f30e2135b0db 401 /**
Yann 0:f30e2135b0db 402 * Send an IP packet on the network using netif->linkoutput
Yann 0:f30e2135b0db 403 * The ethernet header is filled in before sending.
Yann 0:f30e2135b0db 404 *
Yann 0:f30e2135b0db 405 * @params netif the lwIP network interface on which to send the packet
Yann 0:f30e2135b0db 406 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
Yann 0:f30e2135b0db 407 * @params src the source MAC address to be copied into the ethernet header
Yann 0:f30e2135b0db 408 * @params dst the destination MAC address to be copied into the ethernet header
Yann 0:f30e2135b0db 409 * @return ERR_OK if the packet was sent, any other err_t on failure
Yann 0:f30e2135b0db 410 */
Yann 0:f30e2135b0db 411 static err_t
Yann 0:f30e2135b0db 412 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
Yann 0:f30e2135b0db 413 {
Yann 0:f30e2135b0db 414 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
Yann 0:f30e2135b0db 415
Yann 0:f30e2135b0db 416 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
Yann 0:f30e2135b0db 417 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
Yann 0:f30e2135b0db 418 ETHADDR32_COPY(&ethhdr->dest, dst);
Yann 0:f30e2135b0db 419 ETHADDR16_COPY(&ethhdr->src, src);
Yann 0:f30e2135b0db 420 ethhdr->type = PP_HTONS(ETHTYPE_IP);
Yann 0:f30e2135b0db 421 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
Yann 0:f30e2135b0db 422 /* send the packet */
Yann 0:f30e2135b0db 423 return netif->linkoutput(netif, p);
Yann 0:f30e2135b0db 424 }
Yann 0:f30e2135b0db 425
Yann 0:f30e2135b0db 426 /**
Yann 0:f30e2135b0db 427 * Update (or insert) a IP/MAC address pair in the ARP cache.
Yann 0:f30e2135b0db 428 *
Yann 0:f30e2135b0db 429 * If a pending entry is resolved, any queued packets will be sent
Yann 0:f30e2135b0db 430 * at this point.
Yann 0:f30e2135b0db 431 *
Yann 0:f30e2135b0db 432 * @param netif netif related to this entry (used for NETIF_ADDRHINT)
Yann 0:f30e2135b0db 433 * @param ipaddr IP address of the inserted ARP entry.
Yann 0:f30e2135b0db 434 * @param ethaddr Ethernet address of the inserted ARP entry.
Yann 0:f30e2135b0db 435 * @param flags @see definition of ETHARP_FLAG_*
Yann 0:f30e2135b0db 436 *
Yann 0:f30e2135b0db 437 * @return
Yann 0:f30e2135b0db 438 * - ERR_OK Succesfully updated ARP cache.
Yann 0:f30e2135b0db 439 * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
Yann 0:f30e2135b0db 440 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
Yann 0:f30e2135b0db 441 *
Yann 0:f30e2135b0db 442 * @see pbuf_free()
Yann 0:f30e2135b0db 443 */
Yann 0:f30e2135b0db 444 static err_t
Yann 0:f30e2135b0db 445 update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
Yann 0:f30e2135b0db 446 {
Yann 0:f30e2135b0db 447 s8_t i;
Yann 0:f30e2135b0db 448 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
Yann 0:f30e2135b0db 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",
Yann 0:f30e2135b0db 450 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
Yann 0:f30e2135b0db 451 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
Yann 0:f30e2135b0db 452 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
Yann 0:f30e2135b0db 453 /* non-unicast address? */
Yann 0:f30e2135b0db 454 if (ip_addr_isany(ipaddr) ||
Yann 0:f30e2135b0db 455 ip_addr_isbroadcast(ipaddr, netif) ||
Yann 0:f30e2135b0db 456 ip_addr_ismulticast(ipaddr)) {
Yann 0:f30e2135b0db 457 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
Yann 0:f30e2135b0db 458 return ERR_ARG;
Yann 0:f30e2135b0db 459 }
Yann 0:f30e2135b0db 460 /* find or create ARP entry */
Yann 0:f30e2135b0db 461 i = find_entry(ipaddr, flags);
Yann 0:f30e2135b0db 462 /* bail out if no entry could be found */
Yann 0:f30e2135b0db 463 if (i < 0) {
Yann 0:f30e2135b0db 464 return (err_t)i;
Yann 0:f30e2135b0db 465 }
Yann 0:f30e2135b0db 466
Yann 0:f30e2135b0db 467 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 468 if (flags & ETHARP_FLAG_STATIC_ENTRY) {
Yann 0:f30e2135b0db 469 /* record static type */
Yann 0:f30e2135b0db 470 arp_table[i].static_entry = 1;
Yann 0:f30e2135b0db 471 }
Yann 0:f30e2135b0db 472 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 473
Yann 0:f30e2135b0db 474 /* mark it stable */
Yann 0:f30e2135b0db 475 arp_table[i].state = ETHARP_STATE_STABLE;
Yann 0:f30e2135b0db 476
Yann 0:f30e2135b0db 477 #if LWIP_SNMP
Yann 0:f30e2135b0db 478 /* record network interface */
Yann 0:f30e2135b0db 479 arp_table[i].netif = netif;
Yann 0:f30e2135b0db 480 #endif /* LWIP_SNMP */
Yann 0:f30e2135b0db 481 /* insert in SNMP ARP index tree */
Yann 0:f30e2135b0db 482 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
Yann 0:f30e2135b0db 483
Yann 0:f30e2135b0db 484 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
Yann 0:f30e2135b0db 485 /* update address */
Yann 0:f30e2135b0db 486 ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
Yann 0:f30e2135b0db 487 /* reset time stamp */
Yann 0:f30e2135b0db 488 arp_table[i].ctime = 0;
Yann 0:f30e2135b0db 489 #if ARP_QUEUEING
Yann 0:f30e2135b0db 490 /* this is where we will send out queued packets! */
Yann 0:f30e2135b0db 491 while (arp_table[i].q != NULL) {
Yann 0:f30e2135b0db 492 struct pbuf *p;
Yann 0:f30e2135b0db 493 /* remember remainder of queue */
Yann 0:f30e2135b0db 494 struct etharp_q_entry *q = arp_table[i].q;
Yann 0:f30e2135b0db 495 /* pop first item off the queue */
Yann 0:f30e2135b0db 496 arp_table[i].q = q->next;
Yann 0:f30e2135b0db 497 /* get the packet pointer */
Yann 0:f30e2135b0db 498 p = q->p;
Yann 0:f30e2135b0db 499 /* now queue entry can be freed */
Yann 0:f30e2135b0db 500 memp_free(MEMP_ARP_QUEUE, q);
Yann 0:f30e2135b0db 501 /* send the queued IP packet */
Yann 0:f30e2135b0db 502 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
Yann 0:f30e2135b0db 503 /* free the queued IP packet */
Yann 0:f30e2135b0db 504 pbuf_free(p);
Yann 0:f30e2135b0db 505 }
Yann 0:f30e2135b0db 506 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 507 return ERR_OK;
Yann 0:f30e2135b0db 508 }
Yann 0:f30e2135b0db 509
Yann 0:f30e2135b0db 510 #if ETHARP_SUPPORT_STATIC_ENTRIES
Yann 0:f30e2135b0db 511 /** Add a new static entry to the ARP table. If an entry exists for the
Yann 0:f30e2135b0db 512 * specified IP address, this entry is overwritten.
Yann 0:f30e2135b0db 513 * If packets are queued for the specified IP address, they are sent out.
Yann 0:f30e2135b0db 514 *
Yann 0:f30e2135b0db 515 * @param ipaddr IP address for the new static entry
Yann 0:f30e2135b0db 516 * @param ethaddr ethernet address for the new static entry
Yann 0:f30e2135b0db 517 * @return @see return values of etharp_add_static_entry
Yann 0:f30e2135b0db 518 */
Yann 0:f30e2135b0db 519 err_t
Yann 0:f30e2135b0db 520 etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
Yann 0:f30e2135b0db 521 {
Yann 0:f30e2135b0db 522 struct netif *netif;
Yann 0:f30e2135b0db 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",
Yann 0:f30e2135b0db 524 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
Yann 0:f30e2135b0db 525 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
Yann 0:f30e2135b0db 526 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
Yann 0:f30e2135b0db 527
Yann 0:f30e2135b0db 528 netif = ip_route(ipaddr);
Yann 0:f30e2135b0db 529 if (netif == NULL) {
Yann 0:f30e2135b0db 530 return ERR_RTE;
Yann 0:f30e2135b0db 531 }
Yann 0:f30e2135b0db 532
Yann 0:f30e2135b0db 533 return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
Yann 0:f30e2135b0db 534 }
Yann 0:f30e2135b0db 535
Yann 0:f30e2135b0db 536 /** Remove a static entry from the ARP table previously added with a call to
Yann 0:f30e2135b0db 537 * etharp_add_static_entry.
Yann 0:f30e2135b0db 538 *
Yann 0:f30e2135b0db 539 * @param ipaddr IP address of the static entry to remove
Yann 0:f30e2135b0db 540 * @return ERR_OK: entry removed
Yann 0:f30e2135b0db 541 * ERR_MEM: entry wasn't found
Yann 0:f30e2135b0db 542 * ERR_ARG: entry wasn't a static entry but a dynamic one
Yann 0:f30e2135b0db 543 */
Yann 0:f30e2135b0db 544 err_t
Yann 0:f30e2135b0db 545 etharp_remove_static_entry(ip_addr_t *ipaddr)
Yann 0:f30e2135b0db 546 {
Yann 0:f30e2135b0db 547 s8_t i;
Yann 0:f30e2135b0db 548 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
Yann 0:f30e2135b0db 549 ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
Yann 0:f30e2135b0db 550
Yann 0:f30e2135b0db 551 /* find or create ARP entry */
Yann 0:f30e2135b0db 552 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
Yann 0:f30e2135b0db 553 /* bail out if no entry could be found */
Yann 0:f30e2135b0db 554 if (i < 0) {
Yann 0:f30e2135b0db 555 return (err_t)i;
Yann 0:f30e2135b0db 556 }
Yann 0:f30e2135b0db 557
Yann 0:f30e2135b0db 558 if ((arp_table[i].state != ETHARP_STATE_STABLE) ||
Yann 0:f30e2135b0db 559 (arp_table[i].static_entry == 0)) {
Yann 0:f30e2135b0db 560 /* entry wasn't a static entry, cannot remove it */
Yann 0:f30e2135b0db 561 return ERR_ARG;
Yann 0:f30e2135b0db 562 }
Yann 0:f30e2135b0db 563 /* entry found, free it */
Yann 0:f30e2135b0db 564 free_entry(i);
Yann 0:f30e2135b0db 565 return ERR_OK;
Yann 0:f30e2135b0db 566 }
Yann 0:f30e2135b0db 567 #endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
Yann 0:f30e2135b0db 568
Yann 0:f30e2135b0db 569 /**
Yann 0:f30e2135b0db 570 * Finds (stable) ethernet/IP address pair from ARP table
Yann 0:f30e2135b0db 571 * using interface and IP address index.
Yann 0:f30e2135b0db 572 * @note the addresses in the ARP table are in network order!
Yann 0:f30e2135b0db 573 *
Yann 0:f30e2135b0db 574 * @param netif points to interface index
Yann 0:f30e2135b0db 575 * @param ipaddr points to the (network order) IP address index
Yann 0:f30e2135b0db 576 * @param eth_ret points to return pointer
Yann 0:f30e2135b0db 577 * @param ip_ret points to return pointer
Yann 0:f30e2135b0db 578 * @return table index if found, -1 otherwise
Yann 0:f30e2135b0db 579 */
Yann 0:f30e2135b0db 580 s8_t
Yann 0:f30e2135b0db 581 etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
Yann 0:f30e2135b0db 582 struct eth_addr **eth_ret, ip_addr_t **ip_ret)
Yann 0:f30e2135b0db 583 {
Yann 0:f30e2135b0db 584 s8_t i;
Yann 0:f30e2135b0db 585
Yann 0:f30e2135b0db 586 LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
Yann 0:f30e2135b0db 587 eth_ret != NULL && ip_ret != NULL);
Yann 0:f30e2135b0db 588
Yann 0:f30e2135b0db 589 LWIP_UNUSED_ARG(netif);
Yann 0:f30e2135b0db 590
Yann 0:f30e2135b0db 591 i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
Yann 0:f30e2135b0db 592 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
Yann 0:f30e2135b0db 593 *eth_ret = &arp_table[i].ethaddr;
Yann 0:f30e2135b0db 594 *ip_ret = &arp_table[i].ipaddr;
Yann 0:f30e2135b0db 595 return i;
Yann 0:f30e2135b0db 596 }
Yann 0:f30e2135b0db 597 return -1;
Yann 0:f30e2135b0db 598 }
Yann 0:f30e2135b0db 599
Yann 0:f30e2135b0db 600 #if ETHARP_TRUST_IP_MAC
Yann 0:f30e2135b0db 601 /**
Yann 0:f30e2135b0db 602 * Updates the ARP table using the given IP packet.
Yann 0:f30e2135b0db 603 *
Yann 0:f30e2135b0db 604 * Uses the incoming IP packet's source address to update the
Yann 0:f30e2135b0db 605 * ARP cache for the local network. The function does not alter
Yann 0:f30e2135b0db 606 * or free the packet. This function must be called before the
Yann 0:f30e2135b0db 607 * packet p is passed to the IP layer.
Yann 0:f30e2135b0db 608 *
Yann 0:f30e2135b0db 609 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
Yann 0:f30e2135b0db 610 * @param p The IP packet that arrived on netif.
Yann 0:f30e2135b0db 611 *
Yann 0:f30e2135b0db 612 * @return NULL
Yann 0:f30e2135b0db 613 *
Yann 0:f30e2135b0db 614 * @see pbuf_free()
Yann 0:f30e2135b0db 615 */
Yann 0:f30e2135b0db 616 static void
Yann 0:f30e2135b0db 617 etharp_ip_input(struct netif *netif, struct pbuf *p)
Yann 0:f30e2135b0db 618 {
Yann 0:f30e2135b0db 619 struct eth_hdr *ethhdr;
Yann 0:f30e2135b0db 620 struct ip_hdr *iphdr;
Yann 0:f30e2135b0db 621 ip_addr_t iphdr_src;
Yann 0:f30e2135b0db 622 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
Yann 0:f30e2135b0db 623
Yann 0:f30e2135b0db 624 /* Only insert an entry if the source IP address of the
Yann 0:f30e2135b0db 625 incoming IP packet comes from a host on the local network. */
Yann 0:f30e2135b0db 626 ethhdr = (struct eth_hdr *)p->payload;
Yann 0:f30e2135b0db 627 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
Yann 0:f30e2135b0db 628 #if ETHARP_SUPPORT_VLAN
Yann 0:f30e2135b0db 629 if (ethhdr->type == ETHTYPE_VLAN) {
Yann 0:f30e2135b0db 630 iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
Yann 0:f30e2135b0db 631 }
Yann 0:f30e2135b0db 632 #endif /* ETHARP_SUPPORT_VLAN */
Yann 0:f30e2135b0db 633
Yann 0:f30e2135b0db 634 ip_addr_copy(iphdr_src, iphdr->src);
Yann 0:f30e2135b0db 635
Yann 0:f30e2135b0db 636 /* source is not on the local network? */
Yann 0:f30e2135b0db 637 if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
Yann 0:f30e2135b0db 638 /* do nothing */
Yann 0:f30e2135b0db 639 return;
Yann 0:f30e2135b0db 640 }
Yann 0:f30e2135b0db 641
Yann 0:f30e2135b0db 642 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
Yann 0:f30e2135b0db 643 /* update the source IP address in the cache, if present */
Yann 0:f30e2135b0db 644 /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
Yann 0:f30e2135b0db 645 * back soon (for example, if the destination IP address is ours. */
Yann 0:f30e2135b0db 646 update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
Yann 0:f30e2135b0db 647 }
Yann 0:f30e2135b0db 648 #endif /* ETHARP_TRUST_IP_MAC */
Yann 0:f30e2135b0db 649
Yann 0:f30e2135b0db 650 /**
Yann 0:f30e2135b0db 651 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
Yann 0:f30e2135b0db 652 * send out queued IP packets. Updates cache with snooped address pairs.
Yann 0:f30e2135b0db 653 *
Yann 0:f30e2135b0db 654 * Should be called for incoming ARP packets. The pbuf in the argument
Yann 0:f30e2135b0db 655 * is freed by this function.
Yann 0:f30e2135b0db 656 *
Yann 0:f30e2135b0db 657 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
Yann 0:f30e2135b0db 658 * @param ethaddr Ethernet address of netif.
Yann 0:f30e2135b0db 659 * @param p The ARP packet that arrived on netif. Is freed by this function.
Yann 0:f30e2135b0db 660 *
Yann 0:f30e2135b0db 661 * @return NULL
Yann 0:f30e2135b0db 662 *
Yann 0:f30e2135b0db 663 * @see pbuf_free()
Yann 0:f30e2135b0db 664 */
Yann 0:f30e2135b0db 665 static void
Yann 0:f30e2135b0db 666 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
Yann 0:f30e2135b0db 667 {
Yann 0:f30e2135b0db 668 struct etharp_hdr *hdr;
Yann 0:f30e2135b0db 669 struct eth_hdr *ethhdr;
Yann 0:f30e2135b0db 670 /* these are aligned properly, whereas the ARP header fields might not be */
Yann 0:f30e2135b0db 671 ip_addr_t sipaddr, dipaddr;
Yann 0:f30e2135b0db 672 u8_t for_us;
Yann 0:f30e2135b0db 673 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 674 const u8_t * ethdst_hwaddr;
Yann 0:f30e2135b0db 675 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 676
Yann 0:f30e2135b0db 677 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
Yann 0:f30e2135b0db 678
Yann 0:f30e2135b0db 679 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
Yann 0:f30e2135b0db 680 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
Yann 0:f30e2135b0db 681 if (p->len < SIZEOF_ETHARP_PACKET) {
Yann 0:f30e2135b0db 682 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
Yann 0:f30e2135b0db 683 ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
Yann 0:f30e2135b0db 684 (s16_t)SIZEOF_ETHARP_PACKET));
Yann 0:f30e2135b0db 685 ETHARP_STATS_INC(etharp.lenerr);
Yann 0:f30e2135b0db 686 ETHARP_STATS_INC(etharp.drop);
Yann 0:f30e2135b0db 687 pbuf_free(p);
Yann 0:f30e2135b0db 688 return;
Yann 0:f30e2135b0db 689 }
Yann 0:f30e2135b0db 690
Yann 0:f30e2135b0db 691 ethhdr = (struct eth_hdr *)p->payload;
Yann 0:f30e2135b0db 692 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
Yann 0:f30e2135b0db 693 #if ETHARP_SUPPORT_VLAN
Yann 0:f30e2135b0db 694 if (ethhdr->type == ETHTYPE_VLAN) {
Yann 0:f30e2135b0db 695 hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
Yann 0:f30e2135b0db 696 }
Yann 0:f30e2135b0db 697 #endif /* ETHARP_SUPPORT_VLAN */
Yann 0:f30e2135b0db 698
Yann 0:f30e2135b0db 699 /* RFC 826 "Packet Reception": */
Yann 0:f30e2135b0db 700 if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
Yann 0:f30e2135b0db 701 (hdr->hwlen != ETHARP_HWADDR_LEN) ||
Yann 0:f30e2135b0db 702 (hdr->protolen != sizeof(ip_addr_t)) ||
Yann 0:f30e2135b0db 703 (hdr->proto != PP_HTONS(ETHTYPE_IP)) ||
Yann 0:f30e2135b0db 704 (ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
Yann 0:f30e2135b0db 705 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
Yann 0:f30e2135b0db 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",
Yann 0:f30e2135b0db 707 hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
Yann 0:f30e2135b0db 708 ETHARP_STATS_INC(etharp.proterr);
Yann 0:f30e2135b0db 709 ETHARP_STATS_INC(etharp.drop);
Yann 0:f30e2135b0db 710 pbuf_free(p);
Yann 0:f30e2135b0db 711 return;
Yann 0:f30e2135b0db 712 }
Yann 0:f30e2135b0db 713 ETHARP_STATS_INC(etharp.recv);
Yann 0:f30e2135b0db 714
Yann 0:f30e2135b0db 715 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 716 /* We have to check if a host already has configured our random
Yann 0:f30e2135b0db 717 * created link local address and continously check if there is
Yann 0:f30e2135b0db 718 * a host with this IP-address so we can detect collisions */
Yann 0:f30e2135b0db 719 autoip_arp_reply(netif, hdr);
Yann 0:f30e2135b0db 720 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 721
Yann 0:f30e2135b0db 722 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
Yann 0:f30e2135b0db 723 * structure packing (not using structure copy which breaks strict-aliasing rules). */
Yann 0:f30e2135b0db 724 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
Yann 0:f30e2135b0db 725 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
Yann 0:f30e2135b0db 726
Yann 0:f30e2135b0db 727 /* this interface is not configured? */
Yann 0:f30e2135b0db 728 if (ip_addr_isany(&netif->ip_addr)) {
Yann 0:f30e2135b0db 729 for_us = 0;
Yann 0:f30e2135b0db 730 } else {
Yann 0:f30e2135b0db 731 /* ARP packet directed to us? */
Yann 0:f30e2135b0db 732 for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
Yann 0:f30e2135b0db 733 }
Yann 0:f30e2135b0db 734
Yann 0:f30e2135b0db 735 /* ARP message directed to us?
Yann 0:f30e2135b0db 736 -> add IP address in ARP cache; assume requester wants to talk to us,
Yann 0:f30e2135b0db 737 can result in directly sending the queued packets for this host.
Yann 0:f30e2135b0db 738 ARP message not directed to us?
Yann 0:f30e2135b0db 739 -> update the source IP address in the cache, if present */
Yann 0:f30e2135b0db 740 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
Yann 0:f30e2135b0db 741 for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
Yann 0:f30e2135b0db 742
Yann 0:f30e2135b0db 743 /* now act on the message itself */
Yann 0:f30e2135b0db 744 switch (hdr->opcode) {
Yann 0:f30e2135b0db 745 /* ARP request? */
Yann 0:f30e2135b0db 746 case PP_HTONS(ARP_REQUEST):
Yann 0:f30e2135b0db 747 /* ARP request. If it asked for our address, we send out a
Yann 0:f30e2135b0db 748 * reply. In any case, we time-stamp any existing ARP entry,
Yann 0:f30e2135b0db 749 * and possiby send out an IP packet that was queued on it. */
Yann 0:f30e2135b0db 750
Yann 0:f30e2135b0db 751 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
Yann 0:f30e2135b0db 752 /* ARP request for our address? */
Yann 0:f30e2135b0db 753 if (for_us) {
Yann 0:f30e2135b0db 754
Yann 0:f30e2135b0db 755 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
Yann 0:f30e2135b0db 756 /* Re-use pbuf to send ARP reply.
Yann 0:f30e2135b0db 757 Since we are re-using an existing pbuf, we can't call etharp_raw since
Yann 0:f30e2135b0db 758 that would allocate a new pbuf. */
Yann 0:f30e2135b0db 759 hdr->opcode = htons(ARP_REPLY);
Yann 0:f30e2135b0db 760
Yann 0:f30e2135b0db 761 IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
Yann 0:f30e2135b0db 762 IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
Yann 0:f30e2135b0db 763
Yann 0:f30e2135b0db 764 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
Yann 0:f30e2135b0db 765 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
Yann 0:f30e2135b0db 766 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 767 /* If we are using Link-Local, all ARP packets that contain a Link-Local
Yann 0:f30e2135b0db 768 * 'sender IP address' MUST be sent using link-layer broadcast instead of
Yann 0:f30e2135b0db 769 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
Yann 0:f30e2135b0db 770 ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
Yann 0:f30e2135b0db 771 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 772
Yann 0:f30e2135b0db 773 ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
Yann 0:f30e2135b0db 774 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 775 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
Yann 0:f30e2135b0db 776 #else /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 777 ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
Yann 0:f30e2135b0db 778 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 779 ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
Yann 0:f30e2135b0db 780 ETHADDR16_COPY(&ethhdr->src, ethaddr);
Yann 0:f30e2135b0db 781
Yann 0:f30e2135b0db 782 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
Yann 0:f30e2135b0db 783 are already correct, we tested that before */
Yann 0:f30e2135b0db 784
Yann 0:f30e2135b0db 785 /* return ARP reply */
Yann 0:f30e2135b0db 786 netif->linkoutput(netif, p);
Yann 0:f30e2135b0db 787 /* we are not configured? */
Yann 0:f30e2135b0db 788 } else if (ip_addr_isany(&netif->ip_addr)) {
Yann 0:f30e2135b0db 789 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
Yann 0:f30e2135b0db 790 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
Yann 0:f30e2135b0db 791 /* request was not directed to us */
Yann 0:f30e2135b0db 792 } else {
Yann 0:f30e2135b0db 793 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
Yann 0:f30e2135b0db 794 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
Yann 0:f30e2135b0db 795 }
Yann 0:f30e2135b0db 796 break;
Yann 0:f30e2135b0db 797 case PP_HTONS(ARP_REPLY):
Yann 0:f30e2135b0db 798 /* ARP reply. We already updated the ARP cache earlier. */
Yann 0:f30e2135b0db 799 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
Yann 0:f30e2135b0db 800 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
Yann 0:f30e2135b0db 801 /* DHCP wants to know about ARP replies from any host with an
Yann 0:f30e2135b0db 802 * IP address also offered to us by the DHCP server. We do not
Yann 0:f30e2135b0db 803 * want to take a duplicate IP address on a single network.
Yann 0:f30e2135b0db 804 * @todo How should we handle redundant (fail-over) interfaces? */
Yann 0:f30e2135b0db 805 dhcp_arp_reply(netif, &sipaddr);
Yann 0:f30e2135b0db 806 #endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
Yann 0:f30e2135b0db 807 break;
Yann 0:f30e2135b0db 808 default:
Yann 0:f30e2135b0db 809 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
Yann 0:f30e2135b0db 810 ETHARP_STATS_INC(etharp.err);
Yann 0:f30e2135b0db 811 break;
Yann 0:f30e2135b0db 812 }
Yann 0:f30e2135b0db 813 /* free ARP packet */
Yann 0:f30e2135b0db 814 pbuf_free(p);
Yann 0:f30e2135b0db 815 }
Yann 0:f30e2135b0db 816
Yann 0:f30e2135b0db 817 /**
Yann 0:f30e2135b0db 818 * Resolve and fill-in Ethernet address header for outgoing IP packet.
Yann 0:f30e2135b0db 819 *
Yann 0:f30e2135b0db 820 * For IP multicast and broadcast, corresponding Ethernet addresses
Yann 0:f30e2135b0db 821 * are selected and the packet is transmitted on the link.
Yann 0:f30e2135b0db 822 *
Yann 0:f30e2135b0db 823 * For unicast addresses, the packet is submitted to etharp_query(). In
Yann 0:f30e2135b0db 824 * case the IP address is outside the local network, the IP address of
Yann 0:f30e2135b0db 825 * the gateway is used.
Yann 0:f30e2135b0db 826 *
Yann 0:f30e2135b0db 827 * @param netif The lwIP network interface which the IP packet will be sent on.
Yann 0:f30e2135b0db 828 * @param q The pbuf(s) containing the IP packet to be sent.
Yann 0:f30e2135b0db 829 * @param ipaddr The IP address of the packet destination.
Yann 0:f30e2135b0db 830 *
Yann 0:f30e2135b0db 831 * @return
Yann 0:f30e2135b0db 832 * - ERR_RTE No route to destination (no gateway to external networks),
Yann 0:f30e2135b0db 833 * or the return type of either etharp_query() or etharp_send_ip().
Yann 0:f30e2135b0db 834 */
Yann 0:f30e2135b0db 835 err_t
Yann 0:f30e2135b0db 836 etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
Yann 0:f30e2135b0db 837 {
Yann 0:f30e2135b0db 838 struct eth_addr *dest, mcastaddr;
Yann 0:f30e2135b0db 839
Yann 0:f30e2135b0db 840 /* make room for Ethernet header - should not fail */
Yann 0:f30e2135b0db 841 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
Yann 0:f30e2135b0db 842 /* bail out */
Yann 0:f30e2135b0db 843 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Yann 0:f30e2135b0db 844 ("etharp_output: could not allocate room for header.\n"));
Yann 0:f30e2135b0db 845 LINK_STATS_INC(link.lenerr);
Yann 0:f30e2135b0db 846 return ERR_BUF;
Yann 0:f30e2135b0db 847 }
Yann 0:f30e2135b0db 848
Yann 0:f30e2135b0db 849 /* assume unresolved Ethernet address */
Yann 0:f30e2135b0db 850 dest = NULL;
Yann 0:f30e2135b0db 851 /* Determine on destination hardware address. Broadcasts and multicasts
Yann 0:f30e2135b0db 852 * are special, other IP addresses are looked up in the ARP table. */
Yann 0:f30e2135b0db 853
Yann 0:f30e2135b0db 854 /* broadcast destination IP address? */
Yann 0:f30e2135b0db 855 if (ip_addr_isbroadcast(ipaddr, netif)) {
Yann 0:f30e2135b0db 856 /* broadcast on Ethernet also */
Yann 0:f30e2135b0db 857 dest = (struct eth_addr *)&ethbroadcast;
Yann 0:f30e2135b0db 858 /* multicast destination IP address? */
Yann 0:f30e2135b0db 859 } else if (ip_addr_ismulticast(ipaddr)) {
Yann 0:f30e2135b0db 860 /* Hash IP multicast address to MAC address.*/
Yann 0:f30e2135b0db 861 mcastaddr.addr[0] = 0x01;
Yann 0:f30e2135b0db 862 mcastaddr.addr[1] = 0x00;
Yann 0:f30e2135b0db 863 mcastaddr.addr[2] = 0x5e;
Yann 0:f30e2135b0db 864 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
Yann 0:f30e2135b0db 865 mcastaddr.addr[4] = ip4_addr3(ipaddr);
Yann 0:f30e2135b0db 866 mcastaddr.addr[5] = ip4_addr4(ipaddr);
Yann 0:f30e2135b0db 867 /* destination Ethernet address is multicast */
Yann 0:f30e2135b0db 868 dest = &mcastaddr;
Yann 0:f30e2135b0db 869 /* unicast destination IP address? */
Yann 0:f30e2135b0db 870 } else {
Yann 0:f30e2135b0db 871 /* outside local network? */
Yann 0:f30e2135b0db 872 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
Yann 0:f30e2135b0db 873 !ip_addr_islinklocal(ipaddr)) {
Yann 0:f30e2135b0db 874 /* interface has default gateway? */
Yann 0:f30e2135b0db 875 if (!ip_addr_isany(&netif->gw)) {
Yann 0:f30e2135b0db 876 /* send to hardware address of default gateway IP address */
Yann 0:f30e2135b0db 877 ipaddr = &(netif->gw);
Yann 0:f30e2135b0db 878 /* no default gateway available */
Yann 0:f30e2135b0db 879 } else {
Yann 0:f30e2135b0db 880 /* no route to destination error (default gateway missing) */
Yann 0:f30e2135b0db 881 return ERR_RTE;
Yann 0:f30e2135b0db 882 }
Yann 0:f30e2135b0db 883 }
Yann 0:f30e2135b0db 884 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 885 if (netif->addr_hint != NULL) {
Yann 0:f30e2135b0db 886 /* per-pcb cached entry was given */
Yann 0:f30e2135b0db 887 u8_t etharp_cached_entry = *(netif->addr_hint);
Yann 0:f30e2135b0db 888 if (etharp_cached_entry < ARP_TABLE_SIZE) {
Yann 0:f30e2135b0db 889 #endif /* LWIP_NETIF_HWADDRHINT */
Yann 0:f30e2135b0db 890 if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
Yann 0:f30e2135b0db 891 (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
Yann 0:f30e2135b0db 892 /* the per-pcb-cached entry is stable and the right one! */
Yann 0:f30e2135b0db 893 ETHARP_STATS_INC(etharp.cachehit);
Yann 0:f30e2135b0db 894 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
Yann 0:f30e2135b0db 895 &arp_table[etharp_cached_entry].ethaddr);
Yann 0:f30e2135b0db 896 }
Yann 0:f30e2135b0db 897 #if LWIP_NETIF_HWADDRHINT
Yann 0:f30e2135b0db 898 }
Yann 0:f30e2135b0db 899 }
Yann 0:f30e2135b0db 900 #endif /* LWIP_NETIF_HWADDRHINT */
Yann 0:f30e2135b0db 901 /* queue on destination Ethernet address belonging to ipaddr */
Yann 0:f30e2135b0db 902 return etharp_query(netif, ipaddr, q);
Yann 0:f30e2135b0db 903 }
Yann 0:f30e2135b0db 904
Yann 0:f30e2135b0db 905 /* continuation for multicast/broadcast destinations */
Yann 0:f30e2135b0db 906 /* obtain source Ethernet address of the given interface */
Yann 0:f30e2135b0db 907 /* send packet directly on the link */
Yann 0:f30e2135b0db 908 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
Yann 0:f30e2135b0db 909 }
Yann 0:f30e2135b0db 910
Yann 0:f30e2135b0db 911 /**
Yann 0:f30e2135b0db 912 * Send an ARP request for the given IP address and/or queue a packet.
Yann 0:f30e2135b0db 913 *
Yann 0:f30e2135b0db 914 * If the IP address was not yet in the cache, a pending ARP cache entry
Yann 0:f30e2135b0db 915 * is added and an ARP request is sent for the given address. The packet
Yann 0:f30e2135b0db 916 * is queued on this entry.
Yann 0:f30e2135b0db 917 *
Yann 0:f30e2135b0db 918 * If the IP address was already pending in the cache, a new ARP request
Yann 0:f30e2135b0db 919 * is sent for the given address. The packet is queued on this entry.
Yann 0:f30e2135b0db 920 *
Yann 0:f30e2135b0db 921 * If the IP address was already stable in the cache, and a packet is
Yann 0:f30e2135b0db 922 * given, it is directly sent and no ARP request is sent out.
Yann 0:f30e2135b0db 923 *
Yann 0:f30e2135b0db 924 * If the IP address was already stable in the cache, and no packet is
Yann 0:f30e2135b0db 925 * given, an ARP request is sent out.
Yann 0:f30e2135b0db 926 *
Yann 0:f30e2135b0db 927 * @param netif The lwIP network interface on which ipaddr
Yann 0:f30e2135b0db 928 * must be queried for.
Yann 0:f30e2135b0db 929 * @param ipaddr The IP address to be resolved.
Yann 0:f30e2135b0db 930 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
Yann 0:f30e2135b0db 931 * q is not freed by this function.
Yann 0:f30e2135b0db 932 *
Yann 0:f30e2135b0db 933 * @note q must only be ONE packet, not a packet queue!
Yann 0:f30e2135b0db 934 *
Yann 0:f30e2135b0db 935 * @return
Yann 0:f30e2135b0db 936 * - ERR_BUF Could not make room for Ethernet header.
Yann 0:f30e2135b0db 937 * - ERR_MEM Hardware address unknown, and no more ARP entries available
Yann 0:f30e2135b0db 938 * to query for address or queue the packet.
Yann 0:f30e2135b0db 939 * - ERR_MEM Could not queue packet due to memory shortage.
Yann 0:f30e2135b0db 940 * - ERR_RTE No route to destination (no gateway to external networks).
Yann 0:f30e2135b0db 941 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
Yann 0:f30e2135b0db 942 *
Yann 0:f30e2135b0db 943 */
Yann 0:f30e2135b0db 944 err_t
Yann 0:f30e2135b0db 945 etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
Yann 0:f30e2135b0db 946 {
Yann 0:f30e2135b0db 947 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
Yann 0:f30e2135b0db 948 err_t result = ERR_MEM;
Yann 0:f30e2135b0db 949 s8_t i; /* ARP entry index */
Yann 0:f30e2135b0db 950
Yann 0:f30e2135b0db 951 /* non-unicast address? */
Yann 0:f30e2135b0db 952 if (ip_addr_isbroadcast(ipaddr, netif) ||
Yann 0:f30e2135b0db 953 ip_addr_ismulticast(ipaddr) ||
Yann 0:f30e2135b0db 954 ip_addr_isany(ipaddr)) {
Yann 0:f30e2135b0db 955 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
Yann 0:f30e2135b0db 956 return ERR_ARG;
Yann 0:f30e2135b0db 957 }
Yann 0:f30e2135b0db 958
Yann 0:f30e2135b0db 959 /* find entry in ARP cache, ask to create entry if queueing packet */
Yann 0:f30e2135b0db 960 i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
Yann 0:f30e2135b0db 961
Yann 0:f30e2135b0db 962 /* could not find or create entry? */
Yann 0:f30e2135b0db 963 if (i < 0) {
Yann 0:f30e2135b0db 964 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
Yann 0:f30e2135b0db 965 if (q) {
Yann 0:f30e2135b0db 966 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
Yann 0:f30e2135b0db 967 ETHARP_STATS_INC(etharp.memerr);
Yann 0:f30e2135b0db 968 }
Yann 0:f30e2135b0db 969 return (err_t)i;
Yann 0:f30e2135b0db 970 }
Yann 0:f30e2135b0db 971
Yann 0:f30e2135b0db 972 /* mark a fresh entry as pending (we just sent a request) */
Yann 0:f30e2135b0db 973 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
Yann 0:f30e2135b0db 974 arp_table[i].state = ETHARP_STATE_PENDING;
Yann 0:f30e2135b0db 975 }
Yann 0:f30e2135b0db 976
Yann 0:f30e2135b0db 977 /* { i is either a STABLE or (new or existing) PENDING entry } */
Yann 0:f30e2135b0db 978 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
Yann 0:f30e2135b0db 979 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
Yann 0:f30e2135b0db 980 (arp_table[i].state == ETHARP_STATE_STABLE)));
Yann 0:f30e2135b0db 981
Yann 0:f30e2135b0db 982 /* do we have a pending entry? or an implicit query request? */
Yann 0:f30e2135b0db 983 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
Yann 0:f30e2135b0db 984 /* try to resolve it; send out ARP request */
Yann 0:f30e2135b0db 985 result = etharp_request(netif, ipaddr);
Yann 0:f30e2135b0db 986 if (result != ERR_OK) {
Yann 0:f30e2135b0db 987 /* ARP request couldn't be sent */
Yann 0:f30e2135b0db 988 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
Yann 0:f30e2135b0db 989 since this failure could be temporary, and the next packet calling
Yann 0:f30e2135b0db 990 etharp_query again could lead to sending the queued packets. */
Yann 0:f30e2135b0db 991 }
Yann 0:f30e2135b0db 992 if (q == NULL) {
Yann 0:f30e2135b0db 993 return result;
Yann 0:f30e2135b0db 994 }
Yann 0:f30e2135b0db 995 }
Yann 0:f30e2135b0db 996
Yann 0:f30e2135b0db 997 /* packet given? */
Yann 0:f30e2135b0db 998 LWIP_ASSERT("q != NULL", q != NULL);
Yann 0:f30e2135b0db 999 /* stable entry? */
Yann 0:f30e2135b0db 1000 if (arp_table[i].state == ETHARP_STATE_STABLE) {
Yann 0:f30e2135b0db 1001 /* we have a valid IP->Ethernet address mapping */
Yann 0:f30e2135b0db 1002 ETHARP_SET_HINT(netif, i);
Yann 0:f30e2135b0db 1003 /* send the packet */
Yann 0:f30e2135b0db 1004 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
Yann 0:f30e2135b0db 1005 /* pending entry? (either just created or already pending */
Yann 0:f30e2135b0db 1006 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
Yann 0:f30e2135b0db 1007 #if ARP_QUEUEING /* queue the given q packet */
Yann 0:f30e2135b0db 1008 struct pbuf *p;
Yann 0:f30e2135b0db 1009 int copy_needed = 0;
Yann 0:f30e2135b0db 1010 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
Yann 0:f30e2135b0db 1011 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
Yann 0:f30e2135b0db 1012 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
Yann 0:f30e2135b0db 1013 p = q;
Yann 0:f30e2135b0db 1014 while (p) {
Yann 0:f30e2135b0db 1015 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
Yann 0:f30e2135b0db 1016 if(p->type != PBUF_ROM) {
Yann 0:f30e2135b0db 1017 copy_needed = 1;
Yann 0:f30e2135b0db 1018 break;
Yann 0:f30e2135b0db 1019 }
Yann 0:f30e2135b0db 1020 p = p->next;
Yann 0:f30e2135b0db 1021 }
Yann 0:f30e2135b0db 1022 if(copy_needed) {
Yann 0:f30e2135b0db 1023 /* copy the whole packet into new pbufs */
Yann 0:f30e2135b0db 1024 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
Yann 0:f30e2135b0db 1025 if(p != NULL) {
Yann 0:f30e2135b0db 1026 if (pbuf_copy(p, q) != ERR_OK) {
Yann 0:f30e2135b0db 1027 pbuf_free(p);
Yann 0:f30e2135b0db 1028 p = NULL;
Yann 0:f30e2135b0db 1029 }
Yann 0:f30e2135b0db 1030 }
Yann 0:f30e2135b0db 1031 } else {
Yann 0:f30e2135b0db 1032 /* referencing the old pbuf is enough */
Yann 0:f30e2135b0db 1033 p = q;
Yann 0:f30e2135b0db 1034 pbuf_ref(p);
Yann 0:f30e2135b0db 1035 }
Yann 0:f30e2135b0db 1036 /* packet could be taken over? */
Yann 0:f30e2135b0db 1037 if (p != NULL) {
Yann 0:f30e2135b0db 1038 /* queue packet ... */
Yann 0:f30e2135b0db 1039 struct etharp_q_entry *new_entry;
Yann 0:f30e2135b0db 1040 /* allocate a new arp queue entry */
Yann 0:f30e2135b0db 1041 new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
Yann 0:f30e2135b0db 1042 if (new_entry != NULL) {
Yann 0:f30e2135b0db 1043 new_entry->next = 0;
Yann 0:f30e2135b0db 1044 new_entry->p = p;
Yann 0:f30e2135b0db 1045 if(arp_table[i].q != NULL) {
Yann 0:f30e2135b0db 1046 /* queue was already existent, append the new entry to the end */
Yann 0:f30e2135b0db 1047 struct etharp_q_entry *r;
Yann 0:f30e2135b0db 1048 r = arp_table[i].q;
Yann 0:f30e2135b0db 1049 while (r->next != NULL) {
Yann 0:f30e2135b0db 1050 r = r->next;
Yann 0:f30e2135b0db 1051 }
Yann 0:f30e2135b0db 1052 r->next = new_entry;
Yann 0:f30e2135b0db 1053 } else {
Yann 0:f30e2135b0db 1054 /* queue did not exist, first item in queue */
Yann 0:f30e2135b0db 1055 arp_table[i].q = new_entry;
Yann 0:f30e2135b0db 1056 }
Yann 0:f30e2135b0db 1057 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
Yann 0:f30e2135b0db 1058 result = ERR_OK;
Yann 0:f30e2135b0db 1059 } else {
Yann 0:f30e2135b0db 1060 /* the pool MEMP_ARP_QUEUE is empty */
Yann 0:f30e2135b0db 1061 pbuf_free(p);
Yann 0:f30e2135b0db 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));
Yann 0:f30e2135b0db 1063 /* { result == ERR_MEM } through initialization */
Yann 0:f30e2135b0db 1064 }
Yann 0:f30e2135b0db 1065 } else {
Yann 0:f30e2135b0db 1066 ETHARP_STATS_INC(etharp.memerr);
Yann 0:f30e2135b0db 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));
Yann 0:f30e2135b0db 1068 /* { result == ERR_MEM } through initialization */
Yann 0:f30e2135b0db 1069 }
Yann 0:f30e2135b0db 1070 #else /* ARP_QUEUEING */
Yann 0:f30e2135b0db 1071 /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
Yann 0:f30e2135b0db 1072 /* { result == ERR_MEM } through initialization */
Yann 0:f30e2135b0db 1073 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
Yann 0:f30e2135b0db 1074 #endif /* ARP_QUEUEING */
Yann 0:f30e2135b0db 1075 }
Yann 0:f30e2135b0db 1076 return result;
Yann 0:f30e2135b0db 1077 }
Yann 0:f30e2135b0db 1078
Yann 0:f30e2135b0db 1079 /**
Yann 0:f30e2135b0db 1080 * Send a raw ARP packet (opcode and all addresses can be modified)
Yann 0:f30e2135b0db 1081 *
Yann 0:f30e2135b0db 1082 * @param netif the lwip network interface on which to send the ARP packet
Yann 0:f30e2135b0db 1083 * @param ethsrc_addr the source MAC address for the ethernet header
Yann 0:f30e2135b0db 1084 * @param ethdst_addr the destination MAC address for the ethernet header
Yann 0:f30e2135b0db 1085 * @param hwsrc_addr the source MAC address for the ARP protocol header
Yann 0:f30e2135b0db 1086 * @param ipsrc_addr the source IP address for the ARP protocol header
Yann 0:f30e2135b0db 1087 * @param hwdst_addr the destination MAC address for the ARP protocol header
Yann 0:f30e2135b0db 1088 * @param ipdst_addr the destination IP address for the ARP protocol header
Yann 0:f30e2135b0db 1089 * @param opcode the type of the ARP packet
Yann 0:f30e2135b0db 1090 * @return ERR_OK if the ARP packet has been sent
Yann 0:f30e2135b0db 1091 * ERR_MEM if the ARP packet couldn't be allocated
Yann 0:f30e2135b0db 1092 * any other err_t on failure
Yann 0:f30e2135b0db 1093 */
Yann 0:f30e2135b0db 1094 #if !LWIP_AUTOIP
Yann 0:f30e2135b0db 1095 static
Yann 0:f30e2135b0db 1096 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 1097 err_t
Yann 0:f30e2135b0db 1098 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
Yann 0:f30e2135b0db 1099 const struct eth_addr *ethdst_addr,
Yann 0:f30e2135b0db 1100 const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
Yann 0:f30e2135b0db 1101 const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
Yann 0:f30e2135b0db 1102 const u16_t opcode)
Yann 0:f30e2135b0db 1103 {
Yann 0:f30e2135b0db 1104 struct pbuf *p;
Yann 0:f30e2135b0db 1105 err_t result = ERR_OK;
Yann 0:f30e2135b0db 1106 struct eth_hdr *ethhdr;
Yann 0:f30e2135b0db 1107 struct etharp_hdr *hdr;
Yann 0:f30e2135b0db 1108 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 1109 const u8_t * ethdst_hwaddr;
Yann 0:f30e2135b0db 1110 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 1111
Yann 0:f30e2135b0db 1112 /* allocate a pbuf for the outgoing ARP request packet */
Yann 0:f30e2135b0db 1113 p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
Yann 0:f30e2135b0db 1114 /* could allocate a pbuf for an ARP request? */
Yann 0:f30e2135b0db 1115 if (p == NULL) {
Yann 0:f30e2135b0db 1116 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Yann 0:f30e2135b0db 1117 ("etharp_raw: could not allocate pbuf for ARP request.\n"));
Yann 0:f30e2135b0db 1118 ETHARP_STATS_INC(etharp.memerr);
Yann 0:f30e2135b0db 1119 return ERR_MEM;
Yann 0:f30e2135b0db 1120 }
Yann 0:f30e2135b0db 1121 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
Yann 0:f30e2135b0db 1122 (p->len >= SIZEOF_ETHARP_PACKET));
Yann 0:f30e2135b0db 1123
Yann 0:f30e2135b0db 1124 ethhdr = (struct eth_hdr *)p->payload;
Yann 0:f30e2135b0db 1125 hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
Yann 0:f30e2135b0db 1126 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
Yann 0:f30e2135b0db 1127 hdr->opcode = htons(opcode);
Yann 0:f30e2135b0db 1128
Yann 0:f30e2135b0db 1129 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
Yann 0:f30e2135b0db 1130 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
Yann 0:f30e2135b0db 1131 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 1132 /* If we are using Link-Local, all ARP packets that contain a Link-Local
Yann 0:f30e2135b0db 1133 * 'sender IP address' MUST be sent using link-layer broadcast instead of
Yann 0:f30e2135b0db 1134 * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
Yann 0:f30e2135b0db 1135 ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
Yann 0:f30e2135b0db 1136 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 1137 /* Write the ARP MAC-Addresses */
Yann 0:f30e2135b0db 1138 ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
Yann 0:f30e2135b0db 1139 ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
Yann 0:f30e2135b0db 1140 /* Write the Ethernet MAC-Addresses */
Yann 0:f30e2135b0db 1141 #if LWIP_AUTOIP
Yann 0:f30e2135b0db 1142 ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
Yann 0:f30e2135b0db 1143 #else /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 1144 ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
Yann 0:f30e2135b0db 1145 #endif /* LWIP_AUTOIP */
Yann 0:f30e2135b0db 1146 ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
Yann 0:f30e2135b0db 1147 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
Yann 0:f30e2135b0db 1148 * structure packing. */
Yann 0:f30e2135b0db 1149 IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
Yann 0:f30e2135b0db 1150 IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
Yann 0:f30e2135b0db 1151
Yann 0:f30e2135b0db 1152 hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
Yann 0:f30e2135b0db 1153 hdr->proto = PP_HTONS(ETHTYPE_IP);
Yann 0:f30e2135b0db 1154 /* set hwlen and protolen */
Yann 0:f30e2135b0db 1155 hdr->hwlen = ETHARP_HWADDR_LEN;
Yann 0:f30e2135b0db 1156 hdr->protolen = sizeof(ip_addr_t);
Yann 0:f30e2135b0db 1157
Yann 0:f30e2135b0db 1158 ethhdr->type = PP_HTONS(ETHTYPE_ARP);
Yann 0:f30e2135b0db 1159 /* send ARP query */
Yann 0:f30e2135b0db 1160 result = netif->linkoutput(netif, p);
Yann 0:f30e2135b0db 1161 ETHARP_STATS_INC(etharp.xmit);
Yann 0:f30e2135b0db 1162 /* free ARP query packet */
Yann 0:f30e2135b0db 1163 pbuf_free(p);
Yann 0:f30e2135b0db 1164 p = NULL;
Yann 0:f30e2135b0db 1165 /* could not allocate pbuf for ARP request */
Yann 0:f30e2135b0db 1166
Yann 0:f30e2135b0db 1167 return result;
Yann 0:f30e2135b0db 1168 }
Yann 0:f30e2135b0db 1169
Yann 0:f30e2135b0db 1170 /**
Yann 0:f30e2135b0db 1171 * Send an ARP request packet asking for ipaddr.
Yann 0:f30e2135b0db 1172 *
Yann 0:f30e2135b0db 1173 * @param netif the lwip network interface on which to send the request
Yann 0:f30e2135b0db 1174 * @param ipaddr the IP address for which to ask
Yann 0:f30e2135b0db 1175 * @return ERR_OK if the request has been sent
Yann 0:f30e2135b0db 1176 * ERR_MEM if the ARP packet couldn't be allocated
Yann 0:f30e2135b0db 1177 * any other err_t on failure
Yann 0:f30e2135b0db 1178 */
Yann 0:f30e2135b0db 1179 err_t
Yann 0:f30e2135b0db 1180 etharp_request(struct netif *netif, ip_addr_t *ipaddr)
Yann 0:f30e2135b0db 1181 {
Yann 0:f30e2135b0db 1182 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
Yann 0:f30e2135b0db 1183 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
Yann 0:f30e2135b0db 1184 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
Yann 0:f30e2135b0db 1185 ipaddr, ARP_REQUEST);
Yann 0:f30e2135b0db 1186 }
Yann 0:f30e2135b0db 1187 #endif /* LWIP_ARP */
Yann 0:f30e2135b0db 1188
Yann 0:f30e2135b0db 1189 /**
Yann 0:f30e2135b0db 1190 * Process received ethernet frames. Using this function instead of directly
Yann 0:f30e2135b0db 1191 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
Yann 0:f30e2135b0db 1192 * the ARP cache is protected from concurrent access.
Yann 0:f30e2135b0db 1193 *
Yann 0:f30e2135b0db 1194 * @param p the recevied packet, p->payload pointing to the ethernet header
Yann 0:f30e2135b0db 1195 * @param netif the network interface on which the packet was received
Yann 0:f30e2135b0db 1196 */
Yann 0:f30e2135b0db 1197 err_t
Yann 0:f30e2135b0db 1198 ethernet_input(struct pbuf *p, struct netif *netif)
Yann 0:f30e2135b0db 1199 {
Yann 0:f30e2135b0db 1200 struct eth_hdr* ethhdr;
Yann 0:f30e2135b0db 1201 u16_t type;
Yann 0:f30e2135b0db 1202
Yann 0:f30e2135b0db 1203 /* points to packet payload, which starts with an Ethernet header */
Yann 0:f30e2135b0db 1204 ethhdr = (struct eth_hdr *)p->payload;
Yann 0:f30e2135b0db 1205 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
Yann 0:f30e2135b0db 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",
Yann 0:f30e2135b0db 1207 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
Yann 0:f30e2135b0db 1208 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
Yann 0:f30e2135b0db 1209 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
Yann 0:f30e2135b0db 1210 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
Yann 0:f30e2135b0db 1211 (unsigned)htons(ethhdr->type)));
Yann 0:f30e2135b0db 1212
Yann 0:f30e2135b0db 1213 type = ethhdr->type;
Yann 0:f30e2135b0db 1214 #if ETHARP_SUPPORT_VLAN
Yann 0:f30e2135b0db 1215 if (type == PP_HTONS(ETHTYPE_VLAN)) {
Yann 0:f30e2135b0db 1216 struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
Yann 0:f30e2135b0db 1217 #ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
Yann 0:f30e2135b0db 1218 if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
Yann 0:f30e2135b0db 1219 /* silently ignore this packet: not for our VLAN */
Yann 0:f30e2135b0db 1220 pbuf_free(p);
Yann 0:f30e2135b0db 1221 return ERR_OK;
Yann 0:f30e2135b0db 1222 }
Yann 0:f30e2135b0db 1223 #endif /* ETHARP_VLAN_CHECK */
Yann 0:f30e2135b0db 1224 type = vlan->tpid;
Yann 0:f30e2135b0db 1225 }
Yann 0:f30e2135b0db 1226 #endif /* ETHARP_SUPPORT_VLAN */
Yann 0:f30e2135b0db 1227
Yann 0:f30e2135b0db 1228 #if LWIP_ARP_FILTER_NETIF
Yann 0:f30e2135b0db 1229 netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
Yann 0:f30e2135b0db 1230 #endif /* LWIP_ARP_FILTER_NETIF*/
Yann 0:f30e2135b0db 1231
Yann 0:f30e2135b0db 1232 switch (type) {
Yann 0:f30e2135b0db 1233 #if LWIP_ARP
Yann 0:f30e2135b0db 1234 /* IP packet? */
Yann 0:f30e2135b0db 1235 case PP_HTONS(ETHTYPE_IP):
Yann 0:f30e2135b0db 1236 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
Yann 0:f30e2135b0db 1237 goto free_and_return;
Yann 0:f30e2135b0db 1238 }
Yann 0:f30e2135b0db 1239 #if ETHARP_TRUST_IP_MAC
Yann 0:f30e2135b0db 1240 /* update ARP table */
Yann 0:f30e2135b0db 1241 etharp_ip_input(netif, p);
Yann 0:f30e2135b0db 1242 #endif /* ETHARP_TRUST_IP_MAC */
Yann 0:f30e2135b0db 1243 /* skip Ethernet header */
Yann 0:f30e2135b0db 1244 if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
Yann 0:f30e2135b0db 1245 LWIP_ASSERT("Can't move over header in packet", 0);
Yann 0:f30e2135b0db 1246 goto free_and_return;
Yann 0:f30e2135b0db 1247 } else {
Yann 0:f30e2135b0db 1248 /* pass to IP layer */
Yann 0:f30e2135b0db 1249 ip_input(p, netif);
Yann 0:f30e2135b0db 1250 }
Yann 0:f30e2135b0db 1251 break;
Yann 0:f30e2135b0db 1252
Yann 0:f30e2135b0db 1253 case PP_HTONS(ETHTYPE_ARP):
Yann 0:f30e2135b0db 1254 if (!(netif->flags & NETIF_FLAG_ETHARP)) {
Yann 0:f30e2135b0db 1255 goto free_and_return;
Yann 0:f30e2135b0db 1256 }
Yann 0:f30e2135b0db 1257 /* pass p to ARP module */
Yann 0:f30e2135b0db 1258 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
Yann 0:f30e2135b0db 1259 break;
Yann 0:f30e2135b0db 1260 #endif /* LWIP_ARP */
Yann 0:f30e2135b0db 1261 #if PPPOE_SUPPORT
Yann 0:f30e2135b0db 1262 case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
Yann 0:f30e2135b0db 1263 pppoe_disc_input(netif, p);
Yann 0:f30e2135b0db 1264 break;
Yann 0:f30e2135b0db 1265
Yann 0:f30e2135b0db 1266 case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
Yann 0:f30e2135b0db 1267 pppoe_data_input(netif, p);
Yann 0:f30e2135b0db 1268 break;
Yann 0:f30e2135b0db 1269 #endif /* PPPOE_SUPPORT */
Yann 0:f30e2135b0db 1270
Yann 0:f30e2135b0db 1271 default:
Yann 0:f30e2135b0db 1272 ETHARP_STATS_INC(etharp.proterr);
Yann 0:f30e2135b0db 1273 ETHARP_STATS_INC(etharp.drop);
Yann 0:f30e2135b0db 1274 goto free_and_return;
Yann 0:f30e2135b0db 1275 }
Yann 0:f30e2135b0db 1276
Yann 0:f30e2135b0db 1277 /* This means the pbuf is freed or consumed,
Yann 0:f30e2135b0db 1278 so the caller doesn't have to free it again */
Yann 0:f30e2135b0db 1279 return ERR_OK;
Yann 0:f30e2135b0db 1280
Yann 0:f30e2135b0db 1281 free_and_return:
Yann 0:f30e2135b0db 1282 pbuf_free(p);
Yann 0:f30e2135b0db 1283 return ERR_OK;
Yann 0:f30e2135b0db 1284 }
Yann 0:f30e2135b0db 1285 #endif /* LWIP_ARP || LWIP_ETHERNET */