Mihail Stoyanov / HTTPServer

My fork of the HTTPServer (working)

Dependents:   DGWWebServer LAN2

Core/lwIP/netif/etharp.c@0:7a64fbb4069d, 2012-08-06 (annotated)

Committer:
screamer
Date:
Mon Aug 06 09:23:14 2012 +0000
Revision:
0:7a64fbb4069d
[mbed] converted /DGWWebServer/HTTPServer

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:7a64fbb4069d 1 /**
screamer 0:7a64fbb4069d 2 * @file
screamer 0:7a64fbb4069d 3 * Address Resolution Protocol module for IP over Ethernet
screamer 0:7a64fbb4069d 4 *
screamer 0:7a64fbb4069d 5 * Functionally, ARP is divided into two parts. The first maps an IP address
screamer 0:7a64fbb4069d 6 * to a physical address when sending a packet, and the second part answers
screamer 0:7a64fbb4069d 7 * requests from other machines for our physical address.
screamer 0:7a64fbb4069d 8 *
screamer 0:7a64fbb4069d 9 * This implementation complies with RFC 826 (Ethernet ARP). It supports
screamer 0:7a64fbb4069d 10 * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
screamer 0:7a64fbb4069d 11 * if an interface calls etharp_query(our_netif, its_ip_addr, NULL) upon
screamer 0:7a64fbb4069d 12 * address change.
screamer 0:7a64fbb4069d 13 */
screamer 0:7a64fbb4069d 14
screamer 0:7a64fbb4069d 15 /*
screamer 0:7a64fbb4069d 16 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
screamer 0:7a64fbb4069d 17 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
screamer 0:7a64fbb4069d 18 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
screamer 0:7a64fbb4069d 19 * All rights reserved.
screamer 0:7a64fbb4069d 20 *
screamer 0:7a64fbb4069d 21 * Redistribution and use in source and binary forms, with or without modification,
screamer 0:7a64fbb4069d 22 * are permitted provided that the following conditions are met:
screamer 0:7a64fbb4069d 23 *
screamer 0:7a64fbb4069d 24 * 1. Redistributions of source code must retain the above copyright notice,
screamer 0:7a64fbb4069d 25 * this list of conditions and the following disclaimer.
screamer 0:7a64fbb4069d 26 * 2. Redistributions in binary form must reproduce the above copyright notice,
screamer 0:7a64fbb4069d 27 * this list of conditions and the following disclaimer in the documentation
screamer 0:7a64fbb4069d 28 * and/or other materials provided with the distribution.
screamer 0:7a64fbb4069d 29 * 3. The name of the author may not be used to endorse or promote products
screamer 0:7a64fbb4069d 30 * derived from this software without specific prior written permission.
screamer 0:7a64fbb4069d 31 *
screamer 0:7a64fbb4069d 32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
screamer 0:7a64fbb4069d 33 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
screamer 0:7a64fbb4069d 34 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
screamer 0:7a64fbb4069d 35 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
screamer 0:7a64fbb4069d 36 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
screamer 0:7a64fbb4069d 37 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
screamer 0:7a64fbb4069d 38 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
screamer 0:7a64fbb4069d 39 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
screamer 0:7a64fbb4069d 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
screamer 0:7a64fbb4069d 41 * OF SUCH DAMAGE.
screamer 0:7a64fbb4069d 42 *
screamer 0:7a64fbb4069d 43 * This file is part of the lwIP TCP/IP stack.
screamer 0:7a64fbb4069d 44 *
screamer 0:7a64fbb4069d 45 */
screamer 0:7a64fbb4069d 46
screamer 0:7a64fbb4069d 47 #include "lwip/opt.h"
screamer 0:7a64fbb4069d 48
screamer 0:7a64fbb4069d 49 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
screamer 0:7a64fbb4069d 50
screamer 0:7a64fbb4069d 51 #include "lwip/inet.h"
screamer 0:7a64fbb4069d 52 #include "lwip/ip.h"
screamer 0:7a64fbb4069d 53 #include "lwip/stats.h"
screamer 0:7a64fbb4069d 54 #include "lwip/snmp.h"
screamer 0:7a64fbb4069d 55 #include "lwip/dhcp.h"
screamer 0:7a64fbb4069d 56 #include "lwip/autoip.h"
screamer 0:7a64fbb4069d 57 #include "netif/etharp.h"
screamer 0:7a64fbb4069d 58
screamer 0:7a64fbb4069d 59 #if PPPOE_SUPPORT
screamer 0:7a64fbb4069d 60 #include "netif/ppp_oe.h"
screamer 0:7a64fbb4069d 61 #endif /* PPPOE_SUPPORT */
screamer 0:7a64fbb4069d 62
screamer 0:7a64fbb4069d 63 #include <string.h>
screamer 0:7a64fbb4069d 64
screamer 0:7a64fbb4069d 65 /** the time an ARP entry stays valid after its last update,
screamer 0:7a64fbb4069d 66 * for ARP_TMR_INTERVAL = 5000, this is
screamer 0:7a64fbb4069d 67 * (240 * 5) seconds = 20 minutes.
screamer 0:7a64fbb4069d 68 */
screamer 0:7a64fbb4069d 69 #define ARP_MAXAGE 240
screamer 0:7a64fbb4069d 70 /** the time an ARP entry stays pending after first request,
screamer 0:7a64fbb4069d 71 * for ARP_TMR_INTERVAL = 5000, this is
screamer 0:7a64fbb4069d 72 * (2 * 5) seconds = 10 seconds.
screamer 0:7a64fbb4069d 73 *
screamer 0:7a64fbb4069d 74 * @internal Keep this number at least 2, otherwise it might
screamer 0:7a64fbb4069d 75 * run out instantly if the timeout occurs directly after a request.
screamer 0:7a64fbb4069d 76 */
screamer 0:7a64fbb4069d 77 #define ARP_MAXPENDING 2
screamer 0:7a64fbb4069d 78
screamer 0:7a64fbb4069d 79 #define HWTYPE_ETHERNET 1
screamer 0:7a64fbb4069d 80
screamer 0:7a64fbb4069d 81 #define ARPH_HWLEN(hdr) (ntohs((hdr)->_hwlen_protolen) >> 8)
screamer 0:7a64fbb4069d 82 #define ARPH_PROTOLEN(hdr) (ntohs((hdr)->_hwlen_protolen) & 0xff)
screamer 0:7a64fbb4069d 83
screamer 0:7a64fbb4069d 84 #define ARPH_HWLEN_SET(hdr, len) (hdr)->_hwlen_protolen = htons(ARPH_PROTOLEN(hdr) | ((len) << 8))
screamer 0:7a64fbb4069d 85 #define ARPH_PROTOLEN_SET(hdr, len) (hdr)->_hwlen_protolen = htons((len) | (ARPH_HWLEN(hdr) << 8))
screamer 0:7a64fbb4069d 86
screamer 0:7a64fbb4069d 87 enum etharp_state {
screamer 0:7a64fbb4069d 88 ETHARP_STATE_EMPTY = 0,
screamer 0:7a64fbb4069d 89 ETHARP_STATE_PENDING,
screamer 0:7a64fbb4069d 90 ETHARP_STATE_STABLE
screamer 0:7a64fbb4069d 91 };
screamer 0:7a64fbb4069d 92
screamer 0:7a64fbb4069d 93 struct etharp_entry {
screamer 0:7a64fbb4069d 94 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 95 /**
screamer 0:7a64fbb4069d 96 * Pointer to queue of pending outgoing packets on this ARP entry.
screamer 0:7a64fbb4069d 97 */
screamer 0:7a64fbb4069d 98 struct etharp_q_entry *q;
screamer 0:7a64fbb4069d 99 #endif
screamer 0:7a64fbb4069d 100 struct ip_addr ipaddr;
screamer 0:7a64fbb4069d 101 struct eth_addr ethaddr;
screamer 0:7a64fbb4069d 102 enum etharp_state state;
screamer 0:7a64fbb4069d 103 u8_t ctime;
screamer 0:7a64fbb4069d 104 struct netif *netif;
screamer 0:7a64fbb4069d 105 };
screamer 0:7a64fbb4069d 106
screamer 0:7a64fbb4069d 107 const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
screamer 0:7a64fbb4069d 108 const struct eth_addr ethzero = {{0,0,0,0,0,0}};
screamer 0:7a64fbb4069d 109 static struct etharp_entry arp_table[ARP_TABLE_SIZE] MEM_POSITION;
screamer 0:7a64fbb4069d 110 #if !LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 111 static u8_t etharp_cached_entry MEM_POSITION;
screamer 0:7a64fbb4069d 112 #endif
screamer 0:7a64fbb4069d 113
screamer 0:7a64fbb4069d 114 /**
screamer 0:7a64fbb4069d 115 * Try hard to create a new entry - we want the IP address to appear in
screamer 0:7a64fbb4069d 116 * the cache (even if this means removing an active entry or so). */
screamer 0:7a64fbb4069d 117 #define ETHARP_TRY_HARD 1
screamer 0:7a64fbb4069d 118 #define ETHARP_FIND_ONLY 2
screamer 0:7a64fbb4069d 119
screamer 0:7a64fbb4069d 120 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 121 #define NETIF_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
screamer 0:7a64fbb4069d 122 *((netif)->addr_hint) = (hint);
screamer 0:7a64fbb4069d 123 static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags, struct netif *netif);
screamer 0:7a64fbb4069d 124 #else /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 125 static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags);
screamer 0:7a64fbb4069d 126 #endif /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 127
screamer 0:7a64fbb4069d 128 static err_t update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags);
screamer 0:7a64fbb4069d 129
screamer 0:7a64fbb4069d 130
screamer 0:7a64fbb4069d 131 /* Some checks, instead of etharp_init(): */
screamer 0:7a64fbb4069d 132 #if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
screamer 0:7a64fbb4069d 133 #error "If you want to use ARP, ARP_TABLE_SIZE must fit in an s8_t, so, you have to reduce it in your lwipopts.h"
screamer 0:7a64fbb4069d 134 #endif
screamer 0:7a64fbb4069d 135
screamer 0:7a64fbb4069d 136
screamer 0:7a64fbb4069d 137 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 138 /**
screamer 0:7a64fbb4069d 139 * Free a complete queue of etharp entries
screamer 0:7a64fbb4069d 140 *
screamer 0:7a64fbb4069d 141 * @param q a qeueue of etharp_q_entry's to free
screamer 0:7a64fbb4069d 142 */
screamer 0:7a64fbb4069d 143 static void
screamer 0:7a64fbb4069d 144 free_etharp_q(struct etharp_q_entry *q)
screamer 0:7a64fbb4069d 145 {
screamer 0:7a64fbb4069d 146 struct etharp_q_entry *r;
screamer 0:7a64fbb4069d 147 LWIP_ASSERT("q != NULL", q != NULL);
screamer 0:7a64fbb4069d 148 LWIP_ASSERT("q->p != NULL", q->p != NULL);
screamer 0:7a64fbb4069d 149 while (q) {
screamer 0:7a64fbb4069d 150 r = q;
screamer 0:7a64fbb4069d 151 q = q->next;
screamer 0:7a64fbb4069d 152 LWIP_ASSERT("r->p != NULL", (r->p != NULL));
screamer 0:7a64fbb4069d 153 pbuf_free(r->p);
screamer 0:7a64fbb4069d 154 memp_free(MEMP_ARP_QUEUE, r);
screamer 0:7a64fbb4069d 155 }
screamer 0:7a64fbb4069d 156 }
screamer 0:7a64fbb4069d 157 #endif
screamer 0:7a64fbb4069d 158
screamer 0:7a64fbb4069d 159 /**
screamer 0:7a64fbb4069d 160 * Clears expired entries in the ARP table.
screamer 0:7a64fbb4069d 161 *
screamer 0:7a64fbb4069d 162 * This function should be called every ETHARP_TMR_INTERVAL microseconds (5 seconds),
screamer 0:7a64fbb4069d 163 * in order to expire entries in the ARP table.
screamer 0:7a64fbb4069d 164 */
screamer 0:7a64fbb4069d 165 void
screamer 0:7a64fbb4069d 166 etharp_tmr(void)
screamer 0:7a64fbb4069d 167 {
screamer 0:7a64fbb4069d 168 u8_t i;
screamer 0:7a64fbb4069d 169
screamer 0:7a64fbb4069d 170 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
screamer 0:7a64fbb4069d 171 /* remove expired entries from the ARP table */
screamer 0:7a64fbb4069d 172 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
screamer 0:7a64fbb4069d 173 arp_table[i].ctime++;
screamer 0:7a64fbb4069d 174 if (((arp_table[i].state == ETHARP_STATE_STABLE) &&
screamer 0:7a64fbb4069d 175 (arp_table[i].ctime >= ARP_MAXAGE)) ||
screamer 0:7a64fbb4069d 176 ((arp_table[i].state == ETHARP_STATE_PENDING) &&
screamer 0:7a64fbb4069d 177 (arp_table[i].ctime >= ARP_MAXPENDING))) {
screamer 0:7a64fbb4069d 178 /* pending or stable entry has become old! */
screamer 0:7a64fbb4069d 179 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
screamer 0:7a64fbb4069d 180 arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
screamer 0:7a64fbb4069d 181 /* clean up entries that have just been expired */
screamer 0:7a64fbb4069d 182 /* remove from SNMP ARP index tree */
screamer 0:7a64fbb4069d 183 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
screamer 0:7a64fbb4069d 184 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 185 /* and empty packet queue */
screamer 0:7a64fbb4069d 186 if (arp_table[i].q != NULL) {
screamer 0:7a64fbb4069d 187 /* remove all queued packets */
screamer 0:7a64fbb4069d 188 LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
screamer 0:7a64fbb4069d 189 free_etharp_q(arp_table[i].q);
screamer 0:7a64fbb4069d 190 arp_table[i].q = NULL;
screamer 0:7a64fbb4069d 191 }
screamer 0:7a64fbb4069d 192 #endif
screamer 0:7a64fbb4069d 193 /* recycle entry for re-use */
screamer 0:7a64fbb4069d 194 arp_table[i].state = ETHARP_STATE_EMPTY;
screamer 0:7a64fbb4069d 195 }
screamer 0:7a64fbb4069d 196 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 197 /* still pending entry? (not expired) */
screamer 0:7a64fbb4069d 198 if (arp_table[i].state == ETHARP_STATE_PENDING) {
screamer 0:7a64fbb4069d 199 /* resend an ARP query here? */
screamer 0:7a64fbb4069d 200 }
screamer 0:7a64fbb4069d 201 #endif
screamer 0:7a64fbb4069d 202 }
screamer 0:7a64fbb4069d 203 }
screamer 0:7a64fbb4069d 204
screamer 0:7a64fbb4069d 205 /**
screamer 0:7a64fbb4069d 206 * Search the ARP table for a matching or new entry.
screamer 0:7a64fbb4069d 207 *
screamer 0:7a64fbb4069d 208 * If an IP address is given, return a pending or stable ARP entry that matches
screamer 0:7a64fbb4069d 209 * the address. If no match is found, create a new entry with this address set,
screamer 0:7a64fbb4069d 210 * but in state ETHARP_EMPTY. The caller must check and possibly change the
screamer 0:7a64fbb4069d 211 * state of the returned entry.
screamer 0:7a64fbb4069d 212 *
screamer 0:7a64fbb4069d 213 * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
screamer 0:7a64fbb4069d 214 *
screamer 0:7a64fbb4069d 215 * In all cases, attempt to create new entries from an empty entry. If no
screamer 0:7a64fbb4069d 216 * empty entries are available and ETHARP_TRY_HARD flag is set, recycle
screamer 0:7a64fbb4069d 217 * old entries. Heuristic choose the least important entry for recycling.
screamer 0:7a64fbb4069d 218 *
screamer 0:7a64fbb4069d 219 * @param ipaddr IP address to find in ARP cache, or to add if not found.
screamer 0:7a64fbb4069d 220 * @param flags
screamer 0:7a64fbb4069d 221 * - ETHARP_TRY_HARD: Try hard to create a entry by allowing recycling of
screamer 0:7a64fbb4069d 222 * active (stable or pending) entries.
screamer 0:7a64fbb4069d 223 *
screamer 0:7a64fbb4069d 224 * @return The ARP entry index that matched or is created, ERR_MEM if no
screamer 0:7a64fbb4069d 225 * entry is found or could be recycled.
screamer 0:7a64fbb4069d 226 */
screamer 0:7a64fbb4069d 227 static s8_t
screamer 0:7a64fbb4069d 228 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 229 find_entry(struct ip_addr *ipaddr, u8_t flags, struct netif *netif)
screamer 0:7a64fbb4069d 230 #else /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 231 find_entry(struct ip_addr *ipaddr, u8_t flags)
screamer 0:7a64fbb4069d 232 #endif /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 233 {
screamer 0:7a64fbb4069d 234 s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
screamer 0:7a64fbb4069d 235 s8_t empty = ARP_TABLE_SIZE;
screamer 0:7a64fbb4069d 236 u8_t i = 0, age_pending = 0, age_stable = 0;
screamer 0:7a64fbb4069d 237 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 238 /* oldest entry with packets on queue */
screamer 0:7a64fbb4069d 239 s8_t old_queue = ARP_TABLE_SIZE;
screamer 0:7a64fbb4069d 240 /* its age */
screamer 0:7a64fbb4069d 241 u8_t age_queue = 0;
screamer 0:7a64fbb4069d 242 #endif
screamer 0:7a64fbb4069d 243
screamer 0:7a64fbb4069d 244 /* First, test if the last call to this function asked for the
screamer 0:7a64fbb4069d 245 * same address. If so, we're really fast! */
screamer 0:7a64fbb4069d 246 if (ipaddr) {
screamer 0:7a64fbb4069d 247 /* ipaddr to search for was given */
screamer 0:7a64fbb4069d 248 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 249 if ((netif != NULL) && (netif->addr_hint != NULL)) {
screamer 0:7a64fbb4069d 250 /* per-pcb cached entry was given */
screamer 0:7a64fbb4069d 251 u8_t per_pcb_cache = *(netif->addr_hint);
screamer 0:7a64fbb4069d 252 if ((per_pcb_cache < ARP_TABLE_SIZE) && arp_table[per_pcb_cache].state == ETHARP_STATE_STABLE) {
screamer 0:7a64fbb4069d 253 /* the per-pcb-cached entry is stable */
screamer 0:7a64fbb4069d 254 if (ip_addr_cmp(ipaddr, &arp_table[per_pcb_cache].ipaddr)) {
screamer 0:7a64fbb4069d 255 /* per-pcb cached entry was the right one! */
screamer 0:7a64fbb4069d 256 ETHARP_STATS_INC(etharp.cachehit);
screamer 0:7a64fbb4069d 257 return per_pcb_cache;
screamer 0:7a64fbb4069d 258 }
screamer 0:7a64fbb4069d 259 }
screamer 0:7a64fbb4069d 260 }
screamer 0:7a64fbb4069d 261 #else /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 262 if (arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) {
screamer 0:7a64fbb4069d 263 /* the cached entry is stable */
screamer 0:7a64fbb4069d 264 if (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr)) {
screamer 0:7a64fbb4069d 265 /* cached entry was the right one! */
screamer 0:7a64fbb4069d 266 ETHARP_STATS_INC(etharp.cachehit);
screamer 0:7a64fbb4069d 267 return etharp_cached_entry;
screamer 0:7a64fbb4069d 268 }
screamer 0:7a64fbb4069d 269 }
screamer 0:7a64fbb4069d 270 #endif /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 271 }
screamer 0:7a64fbb4069d 272
screamer 0:7a64fbb4069d 273 /**
screamer 0:7a64fbb4069d 274 * a) do a search through the cache, remember candidates
screamer 0:7a64fbb4069d 275 * b) select candidate entry
screamer 0:7a64fbb4069d 276 * c) create new entry
screamer 0:7a64fbb4069d 277 */
screamer 0:7a64fbb4069d 278
screamer 0:7a64fbb4069d 279 /* a) in a single search sweep, do all of this
screamer 0:7a64fbb4069d 280 * 1) remember the first empty entry (if any)
screamer 0:7a64fbb4069d 281 * 2) remember the oldest stable entry (if any)
screamer 0:7a64fbb4069d 282 * 3) remember the oldest pending entry without queued packets (if any)
screamer 0:7a64fbb4069d 283 * 4) remember the oldest pending entry with queued packets (if any)
screamer 0:7a64fbb4069d 284 * 5) search for a matching IP entry, either pending or stable
screamer 0:7a64fbb4069d 285 * until 5 matches, or all entries are searched for.
screamer 0:7a64fbb4069d 286 */
screamer 0:7a64fbb4069d 287
screamer 0:7a64fbb4069d 288 for (i = 0; i < ARP_TABLE_SIZE; ++i) {
screamer 0:7a64fbb4069d 289 /* no empty entry found yet and now we do find one? */
screamer 0:7a64fbb4069d 290 if ((empty == ARP_TABLE_SIZE) && (arp_table[i].state == ETHARP_STATE_EMPTY)) {
screamer 0:7a64fbb4069d 291 LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
screamer 0:7a64fbb4069d 292 /* remember first empty entry */
screamer 0:7a64fbb4069d 293 empty = i;
screamer 0:7a64fbb4069d 294 }
screamer 0:7a64fbb4069d 295 /* pending entry? */
screamer 0:7a64fbb4069d 296 else if (arp_table[i].state == ETHARP_STATE_PENDING) {
screamer 0:7a64fbb4069d 297 /* if given, does IP address match IP address in ARP entry? */
screamer 0:7a64fbb4069d 298 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
screamer 0:7a64fbb4069d 299 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching pending entry %"U16_F"\n", (u16_t)i));
screamer 0:7a64fbb4069d 300 /* found exact IP address match, simply bail out */
screamer 0:7a64fbb4069d 301 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 302 NETIF_SET_HINT(netif, i);
screamer 0:7a64fbb4069d 303 #else /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 304 etharp_cached_entry = i;
screamer 0:7a64fbb4069d 305 #endif /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 306 return i;
screamer 0:7a64fbb4069d 307 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 308 /* pending with queued packets? */
screamer 0:7a64fbb4069d 309 } else if (arp_table[i].q != NULL) {
screamer 0:7a64fbb4069d 310 if (arp_table[i].ctime >= age_queue) {
screamer 0:7a64fbb4069d 311 old_queue = i;
screamer 0:7a64fbb4069d 312 age_queue = arp_table[i].ctime;
screamer 0:7a64fbb4069d 313 }
screamer 0:7a64fbb4069d 314 #endif
screamer 0:7a64fbb4069d 315 /* pending without queued packets? */
screamer 0:7a64fbb4069d 316 } else {
screamer 0:7a64fbb4069d 317 if (arp_table[i].ctime >= age_pending) {
screamer 0:7a64fbb4069d 318 old_pending = i;
screamer 0:7a64fbb4069d 319 age_pending = arp_table[i].ctime;
screamer 0:7a64fbb4069d 320 }
screamer 0:7a64fbb4069d 321 }
screamer 0:7a64fbb4069d 322 }
screamer 0:7a64fbb4069d 323 /* stable entry? */
screamer 0:7a64fbb4069d 324 else if (arp_table[i].state == ETHARP_STATE_STABLE) {
screamer 0:7a64fbb4069d 325 /* if given, does IP address match IP address in ARP entry? */
screamer 0:7a64fbb4069d 326 if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
screamer 0:7a64fbb4069d 327 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching stable entry %"U16_F"\n", (u16_t)i));
screamer 0:7a64fbb4069d 328 /* found exact IP address match, simply bail out */
screamer 0:7a64fbb4069d 329 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 330 NETIF_SET_HINT(netif, i);
screamer 0:7a64fbb4069d 331 #else /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 332 etharp_cached_entry = i;
screamer 0:7a64fbb4069d 333 #endif /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 334 return i;
screamer 0:7a64fbb4069d 335 /* remember entry with oldest stable entry in oldest, its age in maxtime */
screamer 0:7a64fbb4069d 336 } else if (arp_table[i].ctime >= age_stable) {
screamer 0:7a64fbb4069d 337 old_stable = i;
screamer 0:7a64fbb4069d 338 age_stable = arp_table[i].ctime;
screamer 0:7a64fbb4069d 339 }
screamer 0:7a64fbb4069d 340 }
screamer 0:7a64fbb4069d 341 }
screamer 0:7a64fbb4069d 342 /* { we have no match } => try to create a new entry */
screamer 0:7a64fbb4069d 343
screamer 0:7a64fbb4069d 344 /* no empty entry found and not allowed to recycle? */
screamer 0:7a64fbb4069d 345 if (((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_TRY_HARD) == 0))
screamer 0:7a64fbb4069d 346 /* or don't create new entry, only search? */
screamer 0:7a64fbb4069d 347 || ((flags & ETHARP_FIND_ONLY) != 0)) {
screamer 0:7a64fbb4069d 348 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
screamer 0:7a64fbb4069d 349 return (s8_t)ERR_MEM;
screamer 0:7a64fbb4069d 350 }
screamer 0:7a64fbb4069d 351
screamer 0:7a64fbb4069d 352 /* b) choose the least destructive entry to recycle:
screamer 0:7a64fbb4069d 353 * 1) empty entry
screamer 0:7a64fbb4069d 354 * 2) oldest stable entry
screamer 0:7a64fbb4069d 355 * 3) oldest pending entry without queued packets
screamer 0:7a64fbb4069d 356 * 4) oldest pending entry with queued packets
screamer 0:7a64fbb4069d 357 *
screamer 0:7a64fbb4069d 358 * { ETHARP_TRY_HARD is set at this point }
screamer 0:7a64fbb4069d 359 */
screamer 0:7a64fbb4069d 360
screamer 0:7a64fbb4069d 361 /* 1) empty entry available? */
screamer 0:7a64fbb4069d 362 if (empty < ARP_TABLE_SIZE) {
screamer 0:7a64fbb4069d 363 i = empty;
screamer 0:7a64fbb4069d 364 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
screamer 0:7a64fbb4069d 365 }
screamer 0:7a64fbb4069d 366 /* 2) found recyclable stable entry? */
screamer 0:7a64fbb4069d 367 else if (old_stable < ARP_TABLE_SIZE) {
screamer 0:7a64fbb4069d 368 /* recycle oldest stable*/
screamer 0:7a64fbb4069d 369 i = old_stable;
screamer 0:7a64fbb4069d 370 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
screamer 0:7a64fbb4069d 371 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 372 /* no queued packets should exist on stable entries */
screamer 0:7a64fbb4069d 373 LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
screamer 0:7a64fbb4069d 374 #endif
screamer 0:7a64fbb4069d 375 /* 3) found recyclable pending entry without queued packets? */
screamer 0:7a64fbb4069d 376 } else if (old_pending < ARP_TABLE_SIZE) {
screamer 0:7a64fbb4069d 377 /* recycle oldest pending */
screamer 0:7a64fbb4069d 378 i = old_pending;
screamer 0:7a64fbb4069d 379 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
screamer 0:7a64fbb4069d 380 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 381 /* 4) found recyclable pending entry with queued packets? */
screamer 0:7a64fbb4069d 382 } else if (old_queue < ARP_TABLE_SIZE) {
screamer 0:7a64fbb4069d 383 /* recycle oldest pending */
screamer 0:7a64fbb4069d 384 i = old_queue;
screamer 0:7a64fbb4069d 385 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)));
screamer 0:7a64fbb4069d 386 free_etharp_q(arp_table[i].q);
screamer 0:7a64fbb4069d 387 arp_table[i].q = NULL;
screamer 0:7a64fbb4069d 388 #endif
screamer 0:7a64fbb4069d 389 /* no empty or recyclable entries found */
screamer 0:7a64fbb4069d 390 } else {
screamer 0:7a64fbb4069d 391 return (s8_t)ERR_MEM;
screamer 0:7a64fbb4069d 392 }
screamer 0:7a64fbb4069d 393
screamer 0:7a64fbb4069d 394 /* { empty or recyclable entry found } */
screamer 0:7a64fbb4069d 395 LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
screamer 0:7a64fbb4069d 396
screamer 0:7a64fbb4069d 397 if (arp_table[i].state != ETHARP_STATE_EMPTY)
screamer 0:7a64fbb4069d 398 {
screamer 0:7a64fbb4069d 399 snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
screamer 0:7a64fbb4069d 400 }
screamer 0:7a64fbb4069d 401 /* recycle entry (no-op for an already empty entry) */
screamer 0:7a64fbb4069d 402 arp_table[i].state = ETHARP_STATE_EMPTY;
screamer 0:7a64fbb4069d 403
screamer 0:7a64fbb4069d 404 /* IP address given? */
screamer 0:7a64fbb4069d 405 if (ipaddr != NULL) {
screamer 0:7a64fbb4069d 406 /* set IP address */
screamer 0:7a64fbb4069d 407 ip_addr_set(&arp_table[i].ipaddr, ipaddr);
screamer 0:7a64fbb4069d 408 }
screamer 0:7a64fbb4069d 409 arp_table[i].ctime = 0;
screamer 0:7a64fbb4069d 410 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 411 NETIF_SET_HINT(netif, i);
screamer 0:7a64fbb4069d 412 #else /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 413 etharp_cached_entry = i;
screamer 0:7a64fbb4069d 414 #endif /* #if LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 415 return (err_t)i;
screamer 0:7a64fbb4069d 416 }
screamer 0:7a64fbb4069d 417
screamer 0:7a64fbb4069d 418 /**
screamer 0:7a64fbb4069d 419 * Send an IP packet on the network using netif->linkoutput
screamer 0:7a64fbb4069d 420 * The ethernet header is filled in before sending.
screamer 0:7a64fbb4069d 421 *
screamer 0:7a64fbb4069d 422 * @params netif the lwIP network interface on which to send the packet
screamer 0:7a64fbb4069d 423 * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
screamer 0:7a64fbb4069d 424 * @params src the source MAC address to be copied into the ethernet header
screamer 0:7a64fbb4069d 425 * @params dst the destination MAC address to be copied into the ethernet header
screamer 0:7a64fbb4069d 426 * @return ERR_OK if the packet was sent, any other err_t on failure
screamer 0:7a64fbb4069d 427 */
screamer 0:7a64fbb4069d 428 static err_t
screamer 0:7a64fbb4069d 429 etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
screamer 0:7a64fbb4069d 430 {
screamer 0:7a64fbb4069d 431 struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
screamer 0:7a64fbb4069d 432 u8_t k;
screamer 0:7a64fbb4069d 433
screamer 0:7a64fbb4069d 434 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
screamer 0:7a64fbb4069d 435 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
screamer 0:7a64fbb4069d 436 k = ETHARP_HWADDR_LEN;
screamer 0:7a64fbb4069d 437 while(k > 0) {
screamer 0:7a64fbb4069d 438 k--;
screamer 0:7a64fbb4069d 439 ethhdr->dest.addr[k] = dst->addr[k];
screamer 0:7a64fbb4069d 440 ethhdr->src.addr[k] = src->addr[k];
screamer 0:7a64fbb4069d 441 }
screamer 0:7a64fbb4069d 442 ethhdr->type = htons(ETHTYPE_IP);
screamer 0:7a64fbb4069d 443 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
screamer 0:7a64fbb4069d 444 /* send the packet */
screamer 0:7a64fbb4069d 445 return netif->linkoutput(netif, p);
screamer 0:7a64fbb4069d 446 }
screamer 0:7a64fbb4069d 447
screamer 0:7a64fbb4069d 448 /**
screamer 0:7a64fbb4069d 449 * Update (or insert) a IP/MAC address pair in the ARP cache.
screamer 0:7a64fbb4069d 450 *
screamer 0:7a64fbb4069d 451 * If a pending entry is resolved, any queued packets will be sent
screamer 0:7a64fbb4069d 452 * at this point.
screamer 0:7a64fbb4069d 453 *
screamer 0:7a64fbb4069d 454 * @param ipaddr IP address of the inserted ARP entry.
screamer 0:7a64fbb4069d 455 * @param ethaddr Ethernet address of the inserted ARP entry.
screamer 0:7a64fbb4069d 456 * @param flags Defines behaviour:
screamer 0:7a64fbb4069d 457 * - ETHARP_TRY_HARD Allows ARP to insert this as a new item. If not specified,
screamer 0:7a64fbb4069d 458 * only existing ARP entries will be updated.
screamer 0:7a64fbb4069d 459 *
screamer 0:7a64fbb4069d 460 * @return
screamer 0:7a64fbb4069d 461 * - ERR_OK Succesfully updated ARP cache.
screamer 0:7a64fbb4069d 462 * - ERR_MEM If we could not add a new ARP entry when ETHARP_TRY_HARD was set.
screamer 0:7a64fbb4069d 463 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
screamer 0:7a64fbb4069d 464 *
screamer 0:7a64fbb4069d 465 * @see pbuf_free()
screamer 0:7a64fbb4069d 466 */
screamer 0:7a64fbb4069d 467 static err_t
screamer 0:7a64fbb4069d 468 update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags)
screamer 0:7a64fbb4069d 469 {
screamer 0:7a64fbb4069d 470 s8_t i;
screamer 0:7a64fbb4069d 471 u8_t k;
screamer 0:7a64fbb4069d 472 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 3, ("update_arp_entry()\n"));
screamer 0:7a64fbb4069d 473 LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
screamer 0:7a64fbb4069d 474 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",
screamer 0:7a64fbb4069d 475 ip4_addr1(ipaddr), ip4_addr2(ipaddr), ip4_addr3(ipaddr), ip4_addr4(ipaddr),
screamer 0:7a64fbb4069d 476 ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
screamer 0:7a64fbb4069d 477 ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
screamer 0:7a64fbb4069d 478 /* non-unicast address? */
screamer 0:7a64fbb4069d 479 if (ip_addr_isany(ipaddr) ||
screamer 0:7a64fbb4069d 480 ip_addr_isbroadcast(ipaddr, netif) ||
screamer 0:7a64fbb4069d 481 ip_addr_ismulticast(ipaddr)) {
screamer 0:7a64fbb4069d 482 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
screamer 0:7a64fbb4069d 483 return ERR_ARG;
screamer 0:7a64fbb4069d 484 }
screamer 0:7a64fbb4069d 485 /* find or create ARP entry */
screamer 0:7a64fbb4069d 486 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 487 i = find_entry(ipaddr, flags, netif);
screamer 0:7a64fbb4069d 488 #else /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 489 i = find_entry(ipaddr, flags);
screamer 0:7a64fbb4069d 490 #endif /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 491 /* bail out if no entry could be found */
screamer 0:7a64fbb4069d 492 if (i < 0)
screamer 0:7a64fbb4069d 493 return (err_t)i;
screamer 0:7a64fbb4069d 494
screamer 0:7a64fbb4069d 495 /* mark it stable */
screamer 0:7a64fbb4069d 496 arp_table[i].state = ETHARP_STATE_STABLE;
screamer 0:7a64fbb4069d 497 /* record network interface */
screamer 0:7a64fbb4069d 498 arp_table[i].netif = netif;
screamer 0:7a64fbb4069d 499
screamer 0:7a64fbb4069d 500 /* insert in SNMP ARP index tree */
screamer 0:7a64fbb4069d 501 snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
screamer 0:7a64fbb4069d 502
screamer 0:7a64fbb4069d 503 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
screamer 0:7a64fbb4069d 504 /* update address */
screamer 0:7a64fbb4069d 505 k = ETHARP_HWADDR_LEN;
screamer 0:7a64fbb4069d 506 while (k > 0) {
screamer 0:7a64fbb4069d 507 k--;
screamer 0:7a64fbb4069d 508 arp_table[i].ethaddr.addr[k] = ethaddr->addr[k];
screamer 0:7a64fbb4069d 509 }
screamer 0:7a64fbb4069d 510 /* reset time stamp */
screamer 0:7a64fbb4069d 511 arp_table[i].ctime = 0;
screamer 0:7a64fbb4069d 512 #if ARP_QUEUEING
screamer 0:7a64fbb4069d 513 /* this is where we will send out queued packets! */
screamer 0:7a64fbb4069d 514 while (arp_table[i].q != NULL) {
screamer 0:7a64fbb4069d 515 struct pbuf *p;
screamer 0:7a64fbb4069d 516 /* remember remainder of queue */
screamer 0:7a64fbb4069d 517 struct etharp_q_entry *q = arp_table[i].q;
screamer 0:7a64fbb4069d 518 /* pop first item off the queue */
screamer 0:7a64fbb4069d 519 arp_table[i].q = q->next;
screamer 0:7a64fbb4069d 520 /* get the packet pointer */
screamer 0:7a64fbb4069d 521 p = q->p;
screamer 0:7a64fbb4069d 522 /* now queue entry can be freed */
screamer 0:7a64fbb4069d 523 memp_free(MEMP_ARP_QUEUE, q);
screamer 0:7a64fbb4069d 524 /* send the queued IP packet */
screamer 0:7a64fbb4069d 525 etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
screamer 0:7a64fbb4069d 526 /* free the queued IP packet */
screamer 0:7a64fbb4069d 527 pbuf_free(p);
screamer 0:7a64fbb4069d 528 }
screamer 0:7a64fbb4069d 529 #endif
screamer 0:7a64fbb4069d 530 return ERR_OK;
screamer 0:7a64fbb4069d 531 }
screamer 0:7a64fbb4069d 532
screamer 0:7a64fbb4069d 533 /**
screamer 0:7a64fbb4069d 534 * Finds (stable) ethernet/IP address pair from ARP table
screamer 0:7a64fbb4069d 535 * using interface and IP address index.
screamer 0:7a64fbb4069d 536 * @note the addresses in the ARP table are in network order!
screamer 0:7a64fbb4069d 537 *
screamer 0:7a64fbb4069d 538 * @param netif points to interface index
screamer 0:7a64fbb4069d 539 * @param ipaddr points to the (network order) IP address index
screamer 0:7a64fbb4069d 540 * @param eth_ret points to return pointer
screamer 0:7a64fbb4069d 541 * @param ip_ret points to return pointer
screamer 0:7a64fbb4069d 542 * @return table index if found, -1 otherwise
screamer 0:7a64fbb4069d 543 */
screamer 0:7a64fbb4069d 544 s8_t
screamer 0:7a64fbb4069d 545 etharp_find_addr(struct netif *netif, struct ip_addr *ipaddr,
screamer 0:7a64fbb4069d 546 struct eth_addr **eth_ret, struct ip_addr **ip_ret)
screamer 0:7a64fbb4069d 547 {
screamer 0:7a64fbb4069d 548 s8_t i;
screamer 0:7a64fbb4069d 549
screamer 0:7a64fbb4069d 550 LWIP_UNUSED_ARG(netif);
screamer 0:7a64fbb4069d 551
screamer 0:7a64fbb4069d 552 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 553 i = find_entry(ipaddr, ETHARP_FIND_ONLY, NULL);
screamer 0:7a64fbb4069d 554 #else /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 555 i = find_entry(ipaddr, ETHARP_FIND_ONLY);
screamer 0:7a64fbb4069d 556 #endif /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 557 if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
screamer 0:7a64fbb4069d 558 *eth_ret = &arp_table[i].ethaddr;
screamer 0:7a64fbb4069d 559 *ip_ret = &arp_table[i].ipaddr;
screamer 0:7a64fbb4069d 560 return i;
screamer 0:7a64fbb4069d 561 }
screamer 0:7a64fbb4069d 562 return -1;
screamer 0:7a64fbb4069d 563 }
screamer 0:7a64fbb4069d 564
screamer 0:7a64fbb4069d 565 /**
screamer 0:7a64fbb4069d 566 * Updates the ARP table using the given IP packet.
screamer 0:7a64fbb4069d 567 *
screamer 0:7a64fbb4069d 568 * Uses the incoming IP packet's source address to update the
screamer 0:7a64fbb4069d 569 * ARP cache for the local network. The function does not alter
screamer 0:7a64fbb4069d 570 * or free the packet. This function must be called before the
screamer 0:7a64fbb4069d 571 * packet p is passed to the IP layer.
screamer 0:7a64fbb4069d 572 *
screamer 0:7a64fbb4069d 573 * @param netif The lwIP network interface on which the IP packet pbuf arrived.
screamer 0:7a64fbb4069d 574 * @param p The IP packet that arrived on netif.
screamer 0:7a64fbb4069d 575 *
screamer 0:7a64fbb4069d 576 * @return NULL
screamer 0:7a64fbb4069d 577 *
screamer 0:7a64fbb4069d 578 * @see pbuf_free()
screamer 0:7a64fbb4069d 579 */
screamer 0:7a64fbb4069d 580 void
screamer 0:7a64fbb4069d 581 etharp_ip_input(struct netif *netif, struct pbuf *p)
screamer 0:7a64fbb4069d 582 {
screamer 0:7a64fbb4069d 583 struct ethip_hdr *hdr;
screamer 0:7a64fbb4069d 584 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
screamer 0:7a64fbb4069d 585 /* Only insert an entry if the source IP address of the
screamer 0:7a64fbb4069d 586 incoming IP packet comes from a host on the local network. */
screamer 0:7a64fbb4069d 587 hdr = (struct ethip_hdr *)p->payload;
screamer 0:7a64fbb4069d 588 /* source is not on the local network? */
screamer 0:7a64fbb4069d 589 if (!ip_addr_netcmp(&(hdr->ip.src), &(netif->ip_addr), &(netif->netmask))) {
screamer 0:7a64fbb4069d 590 /* do nothing */
screamer 0:7a64fbb4069d 591 return;
screamer 0:7a64fbb4069d 592 }
screamer 0:7a64fbb4069d 593
screamer 0:7a64fbb4069d 594 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
screamer 0:7a64fbb4069d 595 /* update ARP table */
screamer 0:7a64fbb4069d 596 /* @todo We could use ETHARP_TRY_HARD if we think we are going to talk
screamer 0:7a64fbb4069d 597 * back soon (for example, if the destination IP address is ours. */
screamer 0:7a64fbb4069d 598 update_arp_entry(netif, &(hdr->ip.src), &(hdr->eth.src), 0);
screamer 0:7a64fbb4069d 599 }
screamer 0:7a64fbb4069d 600
screamer 0:7a64fbb4069d 601
screamer 0:7a64fbb4069d 602 /**
screamer 0:7a64fbb4069d 603 * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
screamer 0:7a64fbb4069d 604 * send out queued IP packets. Updates cache with snooped address pairs.
screamer 0:7a64fbb4069d 605 *
screamer 0:7a64fbb4069d 606 * Should be called for incoming ARP packets. The pbuf in the argument
screamer 0:7a64fbb4069d 607 * is freed by this function.
screamer 0:7a64fbb4069d 608 *
screamer 0:7a64fbb4069d 609 * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
screamer 0:7a64fbb4069d 610 * @param ethaddr Ethernet address of netif.
screamer 0:7a64fbb4069d 611 * @param p The ARP packet that arrived on netif. Is freed by this function.
screamer 0:7a64fbb4069d 612 *
screamer 0:7a64fbb4069d 613 * @return NULL
screamer 0:7a64fbb4069d 614 *
screamer 0:7a64fbb4069d 615 * @see pbuf_free()
screamer 0:7a64fbb4069d 616 */
screamer 0:7a64fbb4069d 617 void
screamer 0:7a64fbb4069d 618 etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
screamer 0:7a64fbb4069d 619 {
screamer 0:7a64fbb4069d 620 struct etharp_hdr *hdr;
screamer 0:7a64fbb4069d 621 /* these are aligned properly, whereas the ARP header fields might not be */
screamer 0:7a64fbb4069d 622 struct ip_addr sipaddr, dipaddr;
screamer 0:7a64fbb4069d 623 u8_t i;
screamer 0:7a64fbb4069d 624 u8_t for_us;
screamer 0:7a64fbb4069d 625 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 626 const u8_t * ethdst_hwaddr;
screamer 0:7a64fbb4069d 627 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 628
screamer 0:7a64fbb4069d 629 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
screamer 0:7a64fbb4069d 630
screamer 0:7a64fbb4069d 631 /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
screamer 0:7a64fbb4069d 632 since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
screamer 0:7a64fbb4069d 633 if (p->len < sizeof(struct etharp_hdr)) {
screamer 0:7a64fbb4069d 634 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len, (s16_t)sizeof(struct etharp_hdr)));
screamer 0:7a64fbb4069d 635 ETHARP_STATS_INC(etharp.lenerr);
screamer 0:7a64fbb4069d 636 ETHARP_STATS_INC(etharp.drop);
screamer 0:7a64fbb4069d 637 pbuf_free(p);
screamer 0:7a64fbb4069d 638 return;
screamer 0:7a64fbb4069d 639 }
screamer 0:7a64fbb4069d 640
screamer 0:7a64fbb4069d 641 hdr = (struct etharp_hdr *)p->payload;
screamer 0:7a64fbb4069d 642
screamer 0:7a64fbb4069d 643 /* RFC 826 "Packet Reception": */
screamer 0:7a64fbb4069d 644 if ((hdr->hwtype != htons(HWTYPE_ETHERNET)) ||
screamer 0:7a64fbb4069d 645 (hdr->_hwlen_protolen != htons((ETHARP_HWADDR_LEN << 8) | sizeof(struct ip_addr))) ||
screamer 0:7a64fbb4069d 646 (hdr->proto != htons(ETHTYPE_IP)) ||
screamer 0:7a64fbb4069d 647 (hdr->ethhdr.type != htons(ETHTYPE_ARP))) {
screamer 0:7a64fbb4069d 648 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 1,
screamer 0:7a64fbb4069d 649 ("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",
screamer 0:7a64fbb4069d 650 hdr->hwtype, ARPH_HWLEN(hdr), hdr->proto, ARPH_PROTOLEN(hdr), hdr->ethhdr.type));
screamer 0:7a64fbb4069d 651 ETHARP_STATS_INC(etharp.proterr);
screamer 0:7a64fbb4069d 652 ETHARP_STATS_INC(etharp.drop);
screamer 0:7a64fbb4069d 653 pbuf_free(p);
screamer 0:7a64fbb4069d 654 return;
screamer 0:7a64fbb4069d 655 }
screamer 0:7a64fbb4069d 656 ETHARP_STATS_INC(etharp.recv);
screamer 0:7a64fbb4069d 657
screamer 0:7a64fbb4069d 658 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 659 /* We have to check if a host already has configured our random
screamer 0:7a64fbb4069d 660 * created link local address and continously check if there is
screamer 0:7a64fbb4069d 661 * a host with this IP-address so we can detect collisions */
screamer 0:7a64fbb4069d 662 autoip_arp_reply(netif, hdr);
screamer 0:7a64fbb4069d 663 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 664
screamer 0:7a64fbb4069d 665 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
screamer 0:7a64fbb4069d 666 * structure packing (not using structure copy which breaks strict-aliasing rules). */
screamer 0:7a64fbb4069d 667 SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
screamer 0:7a64fbb4069d 668 SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
screamer 0:7a64fbb4069d 669
screamer 0:7a64fbb4069d 670 /* this interface is not configured? */
screamer 0:7a64fbb4069d 671 if (netif->ip_addr.addr == 0) {
screamer 0:7a64fbb4069d 672 for_us = 0;
screamer 0:7a64fbb4069d 673 } else {
screamer 0:7a64fbb4069d 674 /* ARP packet directed to us? */
screamer 0:7a64fbb4069d 675 for_us = ip_addr_cmp(&dipaddr, &(netif->ip_addr));
screamer 0:7a64fbb4069d 676 }
screamer 0:7a64fbb4069d 677
screamer 0:7a64fbb4069d 678 /* ARP message directed to us? */
screamer 0:7a64fbb4069d 679 if (for_us) {
screamer 0:7a64fbb4069d 680 /* add IP address in ARP cache; assume requester wants to talk to us.
screamer 0:7a64fbb4069d 681 * can result in directly sending the queued packets for this host. */
screamer 0:7a64fbb4069d 682 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_TRY_HARD);
screamer 0:7a64fbb4069d 683 /* ARP message not directed to us? */
screamer 0:7a64fbb4069d 684 } else {
screamer 0:7a64fbb4069d 685 /* update the source IP address in the cache, if present */
screamer 0:7a64fbb4069d 686 update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), 0);
screamer 0:7a64fbb4069d 687 }
screamer 0:7a64fbb4069d 688
screamer 0:7a64fbb4069d 689 /* now act on the message itself */
screamer 0:7a64fbb4069d 690 switch (htons(hdr->opcode)) {
screamer 0:7a64fbb4069d 691 /* ARP request? */
screamer 0:7a64fbb4069d 692 case ARP_REQUEST:
screamer 0:7a64fbb4069d 693 /* ARP request. If it asked for our address, we send out a
screamer 0:7a64fbb4069d 694 * reply. In any case, we time-stamp any existing ARP entry,
screamer 0:7a64fbb4069d 695 * and possiby send out an IP packet that was queued on it. */
screamer 0:7a64fbb4069d 696
screamer 0:7a64fbb4069d 697 LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
screamer 0:7a64fbb4069d 698 /* ARP request for our address? */
screamer 0:7a64fbb4069d 699 if (for_us) {
screamer 0:7a64fbb4069d 700
screamer 0:7a64fbb4069d 701 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
screamer 0:7a64fbb4069d 702 /* Re-use pbuf to send ARP reply.
screamer 0:7a64fbb4069d 703 Since we are re-using an existing pbuf, we can't call etharp_raw since
screamer 0:7a64fbb4069d 704 that would allocate a new pbuf. */
screamer 0:7a64fbb4069d 705 hdr->opcode = htons(ARP_REPLY);
screamer 0:7a64fbb4069d 706
screamer 0:7a64fbb4069d 707 hdr->dipaddr = hdr->sipaddr;
screamer 0:7a64fbb4069d 708 SMEMCPY(&hdr->sipaddr, &netif->ip_addr, sizeof(hdr->sipaddr));
screamer 0:7a64fbb4069d 709
screamer 0:7a64fbb4069d 710 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
screamer 0:7a64fbb4069d 711 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
screamer 0:7a64fbb4069d 712 i = ETHARP_HWADDR_LEN;
screamer 0:7a64fbb4069d 713 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 714 /* If we are using Link-Local, ARP packets must be broadcast on the
screamer 0:7a64fbb4069d 715 * link layer. (See RFC3927 Section 2.5) */
screamer 0:7a64fbb4069d 716 ethdst_hwaddr = ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
screamer 0:7a64fbb4069d 717 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 718
screamer 0:7a64fbb4069d 719 while(i > 0) {
screamer 0:7a64fbb4069d 720 i--;
screamer 0:7a64fbb4069d 721 hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
screamer 0:7a64fbb4069d 722 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 723 hdr->ethhdr.dest.addr[i] = ethdst_hwaddr[i];
screamer 0:7a64fbb4069d 724 #else /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 725 hdr->ethhdr.dest.addr[i] = hdr->shwaddr.addr[i];
screamer 0:7a64fbb4069d 726 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 727 hdr->shwaddr.addr[i] = ethaddr->addr[i];
screamer 0:7a64fbb4069d 728 hdr->ethhdr.src.addr[i] = ethaddr->addr[i];
screamer 0:7a64fbb4069d 729 }
screamer 0:7a64fbb4069d 730
screamer 0:7a64fbb4069d 731 /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
screamer 0:7a64fbb4069d 732 are already correct, we tested that before */
screamer 0:7a64fbb4069d 733
screamer 0:7a64fbb4069d 734 /* return ARP reply */
screamer 0:7a64fbb4069d 735 netif->linkoutput(netif, p);
screamer 0:7a64fbb4069d 736 /* we are not configured? */
screamer 0:7a64fbb4069d 737 } else if (netif->ip_addr.addr == 0) {
screamer 0:7a64fbb4069d 738 /* { for_us == 0 and netif->ip_addr.addr == 0 } */
screamer 0:7a64fbb4069d 739 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
screamer 0:7a64fbb4069d 740 /* request was not directed to us */
screamer 0:7a64fbb4069d 741 } else {
screamer 0:7a64fbb4069d 742 /* { for_us == 0 and netif->ip_addr.addr != 0 } */
screamer 0:7a64fbb4069d 743 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
screamer 0:7a64fbb4069d 744 }
screamer 0:7a64fbb4069d 745 break;
screamer 0:7a64fbb4069d 746 case ARP_REPLY:
screamer 0:7a64fbb4069d 747 /* ARP reply. We already updated the ARP cache earlier. */
screamer 0:7a64fbb4069d 748 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
screamer 0:7a64fbb4069d 749 #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
screamer 0:7a64fbb4069d 750 /* DHCP wants to know about ARP replies from any host with an
screamer 0:7a64fbb4069d 751 * IP address also offered to us by the DHCP server. We do not
screamer 0:7a64fbb4069d 752 * want to take a duplicate IP address on a single network.
screamer 0:7a64fbb4069d 753 * @todo How should we handle redundant (fail-over) interfaces? */
screamer 0:7a64fbb4069d 754 dhcp_arp_reply(netif, &sipaddr);
screamer 0:7a64fbb4069d 755 #endif
screamer 0:7a64fbb4069d 756 break;
screamer 0:7a64fbb4069d 757 default:
screamer 0:7a64fbb4069d 758 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
screamer 0:7a64fbb4069d 759 ETHARP_STATS_INC(etharp.err);
screamer 0:7a64fbb4069d 760 break;
screamer 0:7a64fbb4069d 761 }
screamer 0:7a64fbb4069d 762 /* free ARP packet */
screamer 0:7a64fbb4069d 763 pbuf_free(p);
screamer 0:7a64fbb4069d 764 }
screamer 0:7a64fbb4069d 765
screamer 0:7a64fbb4069d 766 /**
screamer 0:7a64fbb4069d 767 * Resolve and fill-in Ethernet address header for outgoing IP packet.
screamer 0:7a64fbb4069d 768 *
screamer 0:7a64fbb4069d 769 * For IP multicast and broadcast, corresponding Ethernet addresses
screamer 0:7a64fbb4069d 770 * are selected and the packet is transmitted on the link.
screamer 0:7a64fbb4069d 771 *
screamer 0:7a64fbb4069d 772 * For unicast addresses, the packet is submitted to etharp_query(). In
screamer 0:7a64fbb4069d 773 * case the IP address is outside the local network, the IP address of
screamer 0:7a64fbb4069d 774 * the gateway is used.
screamer 0:7a64fbb4069d 775 *
screamer 0:7a64fbb4069d 776 * @param netif The lwIP network interface which the IP packet will be sent on.
screamer 0:7a64fbb4069d 777 * @param q The pbuf(s) containing the IP packet to be sent.
screamer 0:7a64fbb4069d 778 * @param ipaddr The IP address of the packet destination.
screamer 0:7a64fbb4069d 779 *
screamer 0:7a64fbb4069d 780 * @return
screamer 0:7a64fbb4069d 781 * - ERR_RTE No route to destination (no gateway to external networks),
screamer 0:7a64fbb4069d 782 * or the return type of either etharp_query() or etharp_send_ip().
screamer 0:7a64fbb4069d 783 */
screamer 0:7a64fbb4069d 784 err_t
screamer 0:7a64fbb4069d 785 etharp_output(struct netif *netif, struct pbuf *q, struct ip_addr *ipaddr)
screamer 0:7a64fbb4069d 786 {
screamer 0:7a64fbb4069d 787 struct eth_addr *dest, mcastaddr;
screamer 0:7a64fbb4069d 788
screamer 0:7a64fbb4069d 789 /* make room for Ethernet header - should not fail */
screamer 0:7a64fbb4069d 790 if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
screamer 0:7a64fbb4069d 791 /* bail out */
screamer 0:7a64fbb4069d 792 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 2, ("etharp_output: could not allocate room for header.\n"));
screamer 0:7a64fbb4069d 793 LINK_STATS_INC(link.lenerr);
screamer 0:7a64fbb4069d 794 return ERR_BUF;
screamer 0:7a64fbb4069d 795 }
screamer 0:7a64fbb4069d 796
screamer 0:7a64fbb4069d 797 /* assume unresolved Ethernet address */
screamer 0:7a64fbb4069d 798 dest = NULL;
screamer 0:7a64fbb4069d 799 /* Determine on destination hardware address. Broadcasts and multicasts
screamer 0:7a64fbb4069d 800 * are special, other IP addresses are looked up in the ARP table. */
screamer 0:7a64fbb4069d 801
screamer 0:7a64fbb4069d 802 /* broadcast destination IP address? */
screamer 0:7a64fbb4069d 803 if (ip_addr_isbroadcast(ipaddr, netif)) {
screamer 0:7a64fbb4069d 804 /* broadcast on Ethernet also */
screamer 0:7a64fbb4069d 805 dest = (struct eth_addr *)&ethbroadcast;
screamer 0:7a64fbb4069d 806 /* multicast destination IP address? */
screamer 0:7a64fbb4069d 807 } else if (ip_addr_ismulticast(ipaddr)) {
screamer 0:7a64fbb4069d 808 /* Hash IP multicast address to MAC address.*/
screamer 0:7a64fbb4069d 809 mcastaddr.addr[0] = 0x01;
screamer 0:7a64fbb4069d 810 mcastaddr.addr[1] = 0x00;
screamer 0:7a64fbb4069d 811 mcastaddr.addr[2] = 0x5e;
screamer 0:7a64fbb4069d 812 mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
screamer 0:7a64fbb4069d 813 mcastaddr.addr[4] = ip4_addr3(ipaddr);
screamer 0:7a64fbb4069d 814 mcastaddr.addr[5] = ip4_addr4(ipaddr);
screamer 0:7a64fbb4069d 815 /* destination Ethernet address is multicast */
screamer 0:7a64fbb4069d 816 dest = &mcastaddr;
screamer 0:7a64fbb4069d 817 /* unicast destination IP address? */
screamer 0:7a64fbb4069d 818 } else {
screamer 0:7a64fbb4069d 819 /* outside local network? */
screamer 0:7a64fbb4069d 820 if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask))) {
screamer 0:7a64fbb4069d 821 /* interface has default gateway? */
screamer 0:7a64fbb4069d 822 if (netif->gw.addr != 0) {
screamer 0:7a64fbb4069d 823 /* send to hardware address of default gateway IP address */
screamer 0:7a64fbb4069d 824 ipaddr = &(netif->gw);
screamer 0:7a64fbb4069d 825 /* no default gateway available */
screamer 0:7a64fbb4069d 826 } else {
screamer 0:7a64fbb4069d 827 /* no route to destination error (default gateway missing) */
screamer 0:7a64fbb4069d 828 return ERR_RTE;
screamer 0:7a64fbb4069d 829 }
screamer 0:7a64fbb4069d 830 }
screamer 0:7a64fbb4069d 831 /* queue on destination Ethernet address belonging to ipaddr */
screamer 0:7a64fbb4069d 832 return etharp_query(netif, ipaddr, q);
screamer 0:7a64fbb4069d 833 }
screamer 0:7a64fbb4069d 834
screamer 0:7a64fbb4069d 835 /* continuation for multicast/broadcast destinations */
screamer 0:7a64fbb4069d 836 /* obtain source Ethernet address of the given interface */
screamer 0:7a64fbb4069d 837 /* send packet directly on the link */
screamer 0:7a64fbb4069d 838 return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
screamer 0:7a64fbb4069d 839 }
screamer 0:7a64fbb4069d 840
screamer 0:7a64fbb4069d 841 /**
screamer 0:7a64fbb4069d 842 * Send an ARP request for the given IP address and/or queue a packet.
screamer 0:7a64fbb4069d 843 *
screamer 0:7a64fbb4069d 844 * If the IP address was not yet in the cache, a pending ARP cache entry
screamer 0:7a64fbb4069d 845 * is added and an ARP request is sent for the given address. The packet
screamer 0:7a64fbb4069d 846 * is queued on this entry.
screamer 0:7a64fbb4069d 847 *
screamer 0:7a64fbb4069d 848 * If the IP address was already pending in the cache, a new ARP request
screamer 0:7a64fbb4069d 849 * is sent for the given address. The packet is queued on this entry.
screamer 0:7a64fbb4069d 850 *
screamer 0:7a64fbb4069d 851 * If the IP address was already stable in the cache, and a packet is
screamer 0:7a64fbb4069d 852 * given, it is directly sent and no ARP request is sent out.
screamer 0:7a64fbb4069d 853 *
screamer 0:7a64fbb4069d 854 * If the IP address was already stable in the cache, and no packet is
screamer 0:7a64fbb4069d 855 * given, an ARP request is sent out.
screamer 0:7a64fbb4069d 856 *
screamer 0:7a64fbb4069d 857 * @param netif The lwIP network interface on which ipaddr
screamer 0:7a64fbb4069d 858 * must be queried for.
screamer 0:7a64fbb4069d 859 * @param ipaddr The IP address to be resolved.
screamer 0:7a64fbb4069d 860 * @param q If non-NULL, a pbuf that must be delivered to the IP address.
screamer 0:7a64fbb4069d 861 * q is not freed by this function.
screamer 0:7a64fbb4069d 862 *
screamer 0:7a64fbb4069d 863 * @note q must only be ONE packet, not a packet queue!
screamer 0:7a64fbb4069d 864 *
screamer 0:7a64fbb4069d 865 * @return
screamer 0:7a64fbb4069d 866 * - ERR_BUF Could not make room for Ethernet header.
screamer 0:7a64fbb4069d 867 * - ERR_MEM Hardware address unknown, and no more ARP entries available
screamer 0:7a64fbb4069d 868 * to query for address or queue the packet.
screamer 0:7a64fbb4069d 869 * - ERR_MEM Could not queue packet due to memory shortage.
screamer 0:7a64fbb4069d 870 * - ERR_RTE No route to destination (no gateway to external networks).
screamer 0:7a64fbb4069d 871 * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
screamer 0:7a64fbb4069d 872 *
screamer 0:7a64fbb4069d 873 */
screamer 0:7a64fbb4069d 874 err_t
screamer 0:7a64fbb4069d 875 etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
screamer 0:7a64fbb4069d 876 {
screamer 0:7a64fbb4069d 877 struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
screamer 0:7a64fbb4069d 878 err_t result = ERR_MEM;
screamer 0:7a64fbb4069d 879 s8_t i; /* ARP entry index */
screamer 0:7a64fbb4069d 880
screamer 0:7a64fbb4069d 881 /* non-unicast address? */
screamer 0:7a64fbb4069d 882 if (ip_addr_isbroadcast(ipaddr, netif) ||
screamer 0:7a64fbb4069d 883 ip_addr_ismulticast(ipaddr) ||
screamer 0:7a64fbb4069d 884 ip_addr_isany(ipaddr)) {
screamer 0:7a64fbb4069d 885 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
screamer 0:7a64fbb4069d 886 return ERR_ARG;
screamer 0:7a64fbb4069d 887 }
screamer 0:7a64fbb4069d 888
screamer 0:7a64fbb4069d 889 /* find entry in ARP cache, ask to create entry if queueing packet */
screamer 0:7a64fbb4069d 890 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 891 i = find_entry(ipaddr, ETHARP_TRY_HARD, netif);
screamer 0:7a64fbb4069d 892 #else /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 893 i = find_entry(ipaddr, ETHARP_TRY_HARD);
screamer 0:7a64fbb4069d 894 #endif /* LWIP_NETIF_HWADDRHINT */
screamer 0:7a64fbb4069d 895
screamer 0:7a64fbb4069d 896 /* could not find or create entry? */
screamer 0:7a64fbb4069d 897 if (i < 0) {
screamer 0:7a64fbb4069d 898 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
screamer 0:7a64fbb4069d 899 if (q) {
screamer 0:7a64fbb4069d 900 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
screamer 0:7a64fbb4069d 901 ETHARP_STATS_INC(etharp.memerr);
screamer 0:7a64fbb4069d 902 }
screamer 0:7a64fbb4069d 903 return (err_t)i;
screamer 0:7a64fbb4069d 904 }
screamer 0:7a64fbb4069d 905
screamer 0:7a64fbb4069d 906 /* mark a fresh entry as pending (we just sent a request) */
screamer 0:7a64fbb4069d 907 if (arp_table[i].state == ETHARP_STATE_EMPTY) {
screamer 0:7a64fbb4069d 908 arp_table[i].state = ETHARP_STATE_PENDING;
screamer 0:7a64fbb4069d 909 }
screamer 0:7a64fbb4069d 910
screamer 0:7a64fbb4069d 911 /* { i is either a STABLE or (new or existing) PENDING entry } */
screamer 0:7a64fbb4069d 912 LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
screamer 0:7a64fbb4069d 913 ((arp_table[i].state == ETHARP_STATE_PENDING) ||
screamer 0:7a64fbb4069d 914 (arp_table[i].state == ETHARP_STATE_STABLE)));
screamer 0:7a64fbb4069d 915
screamer 0:7a64fbb4069d 916 /* do we have a pending entry? or an implicit query request? */
screamer 0:7a64fbb4069d 917 if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
screamer 0:7a64fbb4069d 918 /* try to resolve it; send out ARP request */
screamer 0:7a64fbb4069d 919 result = etharp_request(netif, ipaddr);
screamer 0:7a64fbb4069d 920 if (result != ERR_OK) {
screamer 0:7a64fbb4069d 921 /* ARP request couldn't be sent */
screamer 0:7a64fbb4069d 922 /* We don't re-send arp request in etharp_tmr, but we still queue packets,
screamer 0:7a64fbb4069d 923 since this failure could be temporary, and the next packet calling
screamer 0:7a64fbb4069d 924 etharp_query again could lead to sending the queued packets. */
screamer 0:7a64fbb4069d 925 }
screamer 0:7a64fbb4069d 926 }
screamer 0:7a64fbb4069d 927
screamer 0:7a64fbb4069d 928 /* packet given? */
screamer 0:7a64fbb4069d 929 if (q != NULL) {
screamer 0:7a64fbb4069d 930 /* stable entry? */
screamer 0:7a64fbb4069d 931 if (arp_table[i].state == ETHARP_STATE_STABLE) {
screamer 0:7a64fbb4069d 932 /* we have a valid IP->Ethernet address mapping */
screamer 0:7a64fbb4069d 933 /* send the packet */
screamer 0:7a64fbb4069d 934 result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
screamer 0:7a64fbb4069d 935 /* pending entry? (either just created or already pending */
screamer 0:7a64fbb4069d 936 } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
screamer 0:7a64fbb4069d 937 #if ARP_QUEUEING /* queue the given q packet */
screamer 0:7a64fbb4069d 938 struct pbuf *p;
screamer 0:7a64fbb4069d 939 int copy_needed = 0;
screamer 0:7a64fbb4069d 940 /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
screamer 0:7a64fbb4069d 941 * to copy the whole queue into a new PBUF_RAM (see bug #11400)
screamer 0:7a64fbb4069d 942 * PBUF_ROMs can be left as they are, since ROM must not get changed. */
screamer 0:7a64fbb4069d 943 p = q;
screamer 0:7a64fbb4069d 944 while (p) {
screamer 0:7a64fbb4069d 945 LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
screamer 0:7a64fbb4069d 946 if(p->type != PBUF_ROM) {
screamer 0:7a64fbb4069d 947 copy_needed = 1;
screamer 0:7a64fbb4069d 948 break;
screamer 0:7a64fbb4069d 949 }
screamer 0:7a64fbb4069d 950 p = p->next;
screamer 0:7a64fbb4069d 951 }
screamer 0:7a64fbb4069d 952 if(copy_needed) {
screamer 0:7a64fbb4069d 953 /* copy the whole packet into new pbufs */
screamer 0:7a64fbb4069d 954 p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
screamer 0:7a64fbb4069d 955 if(p != NULL) {
screamer 0:7a64fbb4069d 956 if (pbuf_copy(p, q) != ERR_OK) {
screamer 0:7a64fbb4069d 957 pbuf_free(p);
screamer 0:7a64fbb4069d 958 p = NULL;
screamer 0:7a64fbb4069d 959 }
screamer 0:7a64fbb4069d 960 }
screamer 0:7a64fbb4069d 961 } else {
screamer 0:7a64fbb4069d 962 /* referencing the old pbuf is enough */
screamer 0:7a64fbb4069d 963 p = q;
screamer 0:7a64fbb4069d 964 pbuf_ref(p);
screamer 0:7a64fbb4069d 965 }
screamer 0:7a64fbb4069d 966 /* packet could be taken over? */
screamer 0:7a64fbb4069d 967 if (p != NULL) {
screamer 0:7a64fbb4069d 968 /* queue packet ... */
screamer 0:7a64fbb4069d 969 struct etharp_q_entry *new_entry;
screamer 0:7a64fbb4069d 970 /* allocate a new arp queue entry */
screamer 0:7a64fbb4069d 971 new_entry = memp_malloc(MEMP_ARP_QUEUE);
screamer 0:7a64fbb4069d 972 if (new_entry != NULL) {
screamer 0:7a64fbb4069d 973 new_entry->next = 0;
screamer 0:7a64fbb4069d 974 new_entry->p = p;
screamer 0:7a64fbb4069d 975 if(arp_table[i].q != NULL) {
screamer 0:7a64fbb4069d 976 /* queue was already existent, append the new entry to the end */
screamer 0:7a64fbb4069d 977 struct etharp_q_entry *r;
screamer 0:7a64fbb4069d 978 r = arp_table[i].q;
screamer 0:7a64fbb4069d 979 while (r->next != NULL) {
screamer 0:7a64fbb4069d 980 r = r->next;
screamer 0:7a64fbb4069d 981 }
screamer 0:7a64fbb4069d 982 r->next = new_entry;
screamer 0:7a64fbb4069d 983 } else {
screamer 0:7a64fbb4069d 984 /* queue did not exist, first item in queue */
screamer 0:7a64fbb4069d 985 arp_table[i].q = new_entry;
screamer 0:7a64fbb4069d 986 }
screamer 0:7a64fbb4069d 987 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
screamer 0:7a64fbb4069d 988 result = ERR_OK;
screamer 0:7a64fbb4069d 989 } else {
screamer 0:7a64fbb4069d 990 /* the pool MEMP_ARP_QUEUE is empty */
screamer 0:7a64fbb4069d 991 pbuf_free(p);
screamer 0:7a64fbb4069d 992 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));
screamer 0:7a64fbb4069d 993 /* { result == ERR_MEM } through initialization */
screamer 0:7a64fbb4069d 994 }
screamer 0:7a64fbb4069d 995 } else {
screamer 0:7a64fbb4069d 996 ETHARP_STATS_INC(etharp.memerr);
screamer 0:7a64fbb4069d 997 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));
screamer 0:7a64fbb4069d 998 /* { result == ERR_MEM } through initialization */
screamer 0:7a64fbb4069d 999 }
screamer 0:7a64fbb4069d 1000 #else /* ARP_QUEUEING == 0 */
screamer 0:7a64fbb4069d 1001 /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
screamer 0:7a64fbb4069d 1002 /* { result == ERR_MEM } through initialization */
screamer 0:7a64fbb4069d 1003 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
screamer 0:7a64fbb4069d 1004 #endif
screamer 0:7a64fbb4069d 1005 }
screamer 0:7a64fbb4069d 1006 }
screamer 0:7a64fbb4069d 1007 return result;
screamer 0:7a64fbb4069d 1008 }
screamer 0:7a64fbb4069d 1009
screamer 0:7a64fbb4069d 1010 /**
screamer 0:7a64fbb4069d 1011 * Send a raw ARP packet (opcode and all addresses can be modified)
screamer 0:7a64fbb4069d 1012 *
screamer 0:7a64fbb4069d 1013 * @param netif the lwip network interface on which to send the ARP packet
screamer 0:7a64fbb4069d 1014 * @param ethsrc_addr the source MAC address for the ethernet header
screamer 0:7a64fbb4069d 1015 * @param ethdst_addr the destination MAC address for the ethernet header
screamer 0:7a64fbb4069d 1016 * @param hwsrc_addr the source MAC address for the ARP protocol header
screamer 0:7a64fbb4069d 1017 * @param ipsrc_addr the source IP address for the ARP protocol header
screamer 0:7a64fbb4069d 1018 * @param hwdst_addr the destination MAC address for the ARP protocol header
screamer 0:7a64fbb4069d 1019 * @param ipdst_addr the destination IP address for the ARP protocol header
screamer 0:7a64fbb4069d 1020 * @param opcode the type of the ARP packet
screamer 0:7a64fbb4069d 1021 * @return ERR_OK if the ARP packet has been sent
screamer 0:7a64fbb4069d 1022 * ERR_MEM if the ARP packet couldn't be allocated
screamer 0:7a64fbb4069d 1023 * any other err_t on failure
screamer 0:7a64fbb4069d 1024 */
screamer 0:7a64fbb4069d 1025 #if !LWIP_AUTOIP
screamer 0:7a64fbb4069d 1026 static
screamer 0:7a64fbb4069d 1027 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 1028 err_t
screamer 0:7a64fbb4069d 1029 etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
screamer 0:7a64fbb4069d 1030 const struct eth_addr *ethdst_addr,
screamer 0:7a64fbb4069d 1031 const struct eth_addr *hwsrc_addr, const struct ip_addr *ipsrc_addr,
screamer 0:7a64fbb4069d 1032 const struct eth_addr *hwdst_addr, const struct ip_addr *ipdst_addr,
screamer 0:7a64fbb4069d 1033 const u16_t opcode)
screamer 0:7a64fbb4069d 1034 {
screamer 0:7a64fbb4069d 1035 struct pbuf *p;
screamer 0:7a64fbb4069d 1036 err_t result = ERR_OK;
screamer 0:7a64fbb4069d 1037 u8_t k; /* ARP entry index */
screamer 0:7a64fbb4069d 1038 struct etharp_hdr *hdr;
screamer 0:7a64fbb4069d 1039 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 1040 const u8_t * ethdst_hwaddr;
screamer 0:7a64fbb4069d 1041 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 1042
screamer 0:7a64fbb4069d 1043 /* allocate a pbuf for the outgoing ARP request packet */
screamer 0:7a64fbb4069d 1044 p = pbuf_alloc(PBUF_RAW, sizeof(struct etharp_hdr), PBUF_RAM);
screamer 0:7a64fbb4069d 1045 /* could allocate a pbuf for an ARP request? */
screamer 0:7a64fbb4069d 1046 if (p == NULL) {
screamer 0:7a64fbb4069d 1047 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | 2, ("etharp_raw: could not allocate pbuf for ARP request.\n"));
screamer 0:7a64fbb4069d 1048 ETHARP_STATS_INC(etharp.memerr);
screamer 0:7a64fbb4069d 1049 return ERR_MEM;
screamer 0:7a64fbb4069d 1050 }
screamer 0:7a64fbb4069d 1051 LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
screamer 0:7a64fbb4069d 1052 (p->len >= sizeof(struct etharp_hdr)));
screamer 0:7a64fbb4069d 1053
screamer 0:7a64fbb4069d 1054 hdr = (struct etharp_hdr *)p->payload;
screamer 0:7a64fbb4069d 1055 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
screamer 0:7a64fbb4069d 1056 hdr->opcode = htons(opcode);
screamer 0:7a64fbb4069d 1057
screamer 0:7a64fbb4069d 1058 LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
screamer 0:7a64fbb4069d 1059 (netif->hwaddr_len == ETHARP_HWADDR_LEN));
screamer 0:7a64fbb4069d 1060 k = ETHARP_HWADDR_LEN;
screamer 0:7a64fbb4069d 1061 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 1062 /* If we are using Link-Local, ARP packets must be broadcast on the
screamer 0:7a64fbb4069d 1063 * link layer. (See RFC3927 Section 2.5) */
screamer 0:7a64fbb4069d 1064 ethdst_hwaddr = ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
screamer 0:7a64fbb4069d 1065 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 1066 /* Write MAC-Addresses (combined loop for both headers) */
screamer 0:7a64fbb4069d 1067 while(k > 0) {
screamer 0:7a64fbb4069d 1068 k--;
screamer 0:7a64fbb4069d 1069 /* Write the ARP MAC-Addresses */
screamer 0:7a64fbb4069d 1070 hdr->shwaddr.addr[k] = hwsrc_addr->addr[k];
screamer 0:7a64fbb4069d 1071 hdr->dhwaddr.addr[k] = hwdst_addr->addr[k];
screamer 0:7a64fbb4069d 1072 /* Write the Ethernet MAC-Addresses */
screamer 0:7a64fbb4069d 1073 #if LWIP_AUTOIP
screamer 0:7a64fbb4069d 1074 hdr->ethhdr.dest.addr[k] = ethdst_hwaddr[k];
screamer 0:7a64fbb4069d 1075 #else /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 1076 hdr->ethhdr.dest.addr[k] = ethdst_addr->addr[k];
screamer 0:7a64fbb4069d 1077 #endif /* LWIP_AUTOIP */
screamer 0:7a64fbb4069d 1078 hdr->ethhdr.src.addr[k] = ethsrc_addr->addr[k];
screamer 0:7a64fbb4069d 1079 }
screamer 0:7a64fbb4069d 1080 hdr->sipaddr = *(struct ip_addr2 *)ipsrc_addr;
screamer 0:7a64fbb4069d 1081 hdr->dipaddr = *(struct ip_addr2 *)ipdst_addr;
screamer 0:7a64fbb4069d 1082
screamer 0:7a64fbb4069d 1083 hdr->hwtype = htons(HWTYPE_ETHERNET);
screamer 0:7a64fbb4069d 1084 hdr->proto = htons(ETHTYPE_IP);
screamer 0:7a64fbb4069d 1085 /* set hwlen and protolen together */
screamer 0:7a64fbb4069d 1086 hdr->_hwlen_protolen = htons((ETHARP_HWADDR_LEN << 8) | sizeof(struct ip_addr));
screamer 0:7a64fbb4069d 1087
screamer 0:7a64fbb4069d 1088 hdr->ethhdr.type = htons(ETHTYPE_ARP);
screamer 0:7a64fbb4069d 1089 /* send ARP query */
screamer 0:7a64fbb4069d 1090 result = netif->linkoutput(netif, p);
screamer 0:7a64fbb4069d 1091 ETHARP_STATS_INC(etharp.xmit);
screamer 0:7a64fbb4069d 1092 /* free ARP query packet */
screamer 0:7a64fbb4069d 1093 pbuf_free(p);
screamer 0:7a64fbb4069d 1094 p = NULL;
screamer 0:7a64fbb4069d 1095 /* could not allocate pbuf for ARP request */
screamer 0:7a64fbb4069d 1096
screamer 0:7a64fbb4069d 1097 return result;
screamer 0:7a64fbb4069d 1098 }
screamer 0:7a64fbb4069d 1099
screamer 0:7a64fbb4069d 1100 /**
screamer 0:7a64fbb4069d 1101 * Send an ARP request packet asking for ipaddr.
screamer 0:7a64fbb4069d 1102 *
screamer 0:7a64fbb4069d 1103 * @param netif the lwip network interface on which to send the request
screamer 0:7a64fbb4069d 1104 * @param ipaddr the IP address for which to ask
screamer 0:7a64fbb4069d 1105 * @return ERR_OK if the request has been sent
screamer 0:7a64fbb4069d 1106 * ERR_MEM if the ARP packet couldn't be allocated
screamer 0:7a64fbb4069d 1107 * any other err_t on failure
screamer 0:7a64fbb4069d 1108 */
screamer 0:7a64fbb4069d 1109 err_t
screamer 0:7a64fbb4069d 1110 etharp_request(struct netif *netif, struct ip_addr *ipaddr)
screamer 0:7a64fbb4069d 1111 {
screamer 0:7a64fbb4069d 1112 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
screamer 0:7a64fbb4069d 1113 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
screamer 0:7a64fbb4069d 1114 (struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
screamer 0:7a64fbb4069d 1115 ipaddr, ARP_REQUEST);
screamer 0:7a64fbb4069d 1116 }
screamer 0:7a64fbb4069d 1117
screamer 0:7a64fbb4069d 1118 /**
screamer 0:7a64fbb4069d 1119 * Process received ethernet frames. Using this function instead of directly
screamer 0:7a64fbb4069d 1120 * calling ip_input and passing ARP frames through etharp in ethernetif_input,
screamer 0:7a64fbb4069d 1121 * the ARP cache is protected from concurrent access.
screamer 0:7a64fbb4069d 1122 *
screamer 0:7a64fbb4069d 1123 * @param p the recevied packet, p->payload pointing to the ethernet header
screamer 0:7a64fbb4069d 1124 * @param netif the network interface on which the packet was received
screamer 0:7a64fbb4069d 1125 */
screamer 0:7a64fbb4069d 1126 err_t
screamer 0:7a64fbb4069d 1127 ethernet_input(struct pbuf *p, struct netif *netif)
screamer 0:7a64fbb4069d 1128 {
screamer 0:7a64fbb4069d 1129 struct eth_hdr* ethhdr;
screamer 0:7a64fbb4069d 1130
screamer 0:7a64fbb4069d 1131 /* points to packet payload, which starts with an Ethernet header */
screamer 0:7a64fbb4069d 1132 ethhdr = (struct eth_hdr *)p->payload;
screamer 0:7a64fbb4069d 1133 LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
screamer 0:7a64fbb4069d 1134 ("ethernet_input: dest:%02x:%02x:%02x:%02x:%02x:%02x, src:%02x:%02x:%02x:%02x:%02x:%02x, type:%2hx\n",
screamer 0:7a64fbb4069d 1135 (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
screamer 0:7a64fbb4069d 1136 (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
screamer 0:7a64fbb4069d 1137 (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
screamer 0:7a64fbb4069d 1138 (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
screamer 0:7a64fbb4069d 1139 (unsigned)htons(ethhdr->type)));
screamer 0:7a64fbb4069d 1140
screamer 0:7a64fbb4069d 1141 switch (htons(ethhdr->type)) {
screamer 0:7a64fbb4069d 1142 /* IP packet? */
screamer 0:7a64fbb4069d 1143 case ETHTYPE_IP:
screamer 0:7a64fbb4069d 1144 #if ETHARP_TRUST_IP_MAC
screamer 0:7a64fbb4069d 1145 /* update ARP table */
screamer 0:7a64fbb4069d 1146 etharp_ip_input(netif, p);
screamer 0:7a64fbb4069d 1147 #endif /* ETHARP_TRUST_IP_MAC */
screamer 0:7a64fbb4069d 1148 /* skip Ethernet header */
screamer 0:7a64fbb4069d 1149 if(pbuf_header(p, -(s16_t)sizeof(struct eth_hdr))) {
screamer 0:7a64fbb4069d 1150 LWIP_ASSERT("Can't move over header in packet", 0);
screamer 0:7a64fbb4069d 1151 pbuf_free(p);
screamer 0:7a64fbb4069d 1152 p = NULL;
screamer 0:7a64fbb4069d 1153 } else {
screamer 0:7a64fbb4069d 1154 /* pass to IP layer */
screamer 0:7a64fbb4069d 1155 ip_input(p, netif);
screamer 0:7a64fbb4069d 1156 }
screamer 0:7a64fbb4069d 1157 break;
screamer 0:7a64fbb4069d 1158
screamer 0:7a64fbb4069d 1159 case ETHTYPE_ARP:
screamer 0:7a64fbb4069d 1160 /* pass p to ARP module */
screamer 0:7a64fbb4069d 1161 etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
screamer 0:7a64fbb4069d 1162 break;
screamer 0:7a64fbb4069d 1163
screamer 0:7a64fbb4069d 1164 #if PPPOE_SUPPORT
screamer 0:7a64fbb4069d 1165 case ETHTYPE_PPPOEDISC: /* PPP Over Ethernet Discovery Stage */
screamer 0:7a64fbb4069d 1166 pppoe_disc_input(netif, p);
screamer 0:7a64fbb4069d 1167 break;
screamer 0:7a64fbb4069d 1168
screamer 0:7a64fbb4069d 1169 case ETHTYPE_PPPOE: /* PPP Over Ethernet Session Stage */
screamer 0:7a64fbb4069d 1170 pppoe_data_input(netif, p);
screamer 0:7a64fbb4069d 1171 break;
screamer 0:7a64fbb4069d 1172 #endif /* PPPOE_SUPPORT */
screamer 0:7a64fbb4069d 1173
screamer 0:7a64fbb4069d 1174 default:
screamer 0:7a64fbb4069d 1175 ETHARP_STATS_INC(etharp.proterr);
screamer 0:7a64fbb4069d 1176 ETHARP_STATS_INC(etharp.drop);
screamer 0:7a64fbb4069d 1177 pbuf_free(p);
screamer 0:7a64fbb4069d 1178 p = NULL;
screamer 0:7a64fbb4069d 1179 break;
screamer 0:7a64fbb4069d 1180 }
screamer 0:7a64fbb4069d 1181
screamer 0:7a64fbb4069d 1182 /* This means the pbuf is freed or consumed,
screamer 0:7a64fbb4069d 1183 so the caller doesn't have to free it again */
screamer 0:7a64fbb4069d 1184 return ERR_OK;
screamer 0:7a64fbb4069d 1185 }
screamer 0:7a64fbb4069d 1186 #endif /* LWIP_ARP */