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lwip/netif/etharp.c@0:ac1725ba162c, 2010-11-09 (annotated)

Committer:: segundo
Date:: Tue Nov 09 20:54:15 2010 +0000
Revision:: 0:ac1725ba162c

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User	Revision	Line number	New contents of line
segundo	0:ac1725ba162c	1	/**
segundo	0:ac1725ba162c	2	* @file
segundo	0:ac1725ba162c	3	* Address Resolution Protocol module for IP over Ethernet
segundo	0:ac1725ba162c	4	*
segundo	0:ac1725ba162c	5	* Functionally, ARP is divided into two parts. The first maps an IP address
segundo	0:ac1725ba162c	6	* to a physical address when sending a packet, and the second part answers
segundo	0:ac1725ba162c	7	* requests from other machines for our physical address.
segundo	0:ac1725ba162c	8	*
segundo	0:ac1725ba162c	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
segundo	0:ac1725ba162c	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
segundo	0:ac1725ba162c	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
segundo	0:ac1725ba162c	12	*/
segundo	0:ac1725ba162c	13
segundo	0:ac1725ba162c	14	/*
segundo	0:ac1725ba162c	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
segundo	0:ac1725ba162c	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
segundo	0:ac1725ba162c	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
segundo	0:ac1725ba162c	18	* All rights reserved.
segundo	0:ac1725ba162c	19	*
segundo	0:ac1725ba162c	20	* Redistribution and use in source and binary forms, with or without modification,
segundo	0:ac1725ba162c	21	* are permitted provided that the following conditions are met:
segundo	0:ac1725ba162c	22	*
segundo	0:ac1725ba162c	23	* 1. Redistributions of source code must retain the above copyright notice,
segundo	0:ac1725ba162c	24	* this list of conditions and the following disclaimer.
segundo	0:ac1725ba162c	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
segundo	0:ac1725ba162c	26	* this list of conditions and the following disclaimer in the documentation
segundo	0:ac1725ba162c	27	* and/or other materials provided with the distribution.
segundo	0:ac1725ba162c	28	* 3. The name of the author may not be used to endorse or promote products
segundo	0:ac1725ba162c	29	* derived from this software without specific prior written permission.
segundo	0:ac1725ba162c	30	*
segundo	0:ac1725ba162c	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
segundo	0:ac1725ba162c	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
segundo	0:ac1725ba162c	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
segundo	0:ac1725ba162c	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
segundo	0:ac1725ba162c	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
segundo	0:ac1725ba162c	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
segundo	0:ac1725ba162c	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
segundo	0:ac1725ba162c	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
segundo	0:ac1725ba162c	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
segundo	0:ac1725ba162c	40	* OF SUCH DAMAGE.
segundo	0:ac1725ba162c	41	*
segundo	0:ac1725ba162c	42	* This file is part of the lwIP TCP/IP stack.
segundo	0:ac1725ba162c	43	*
segundo	0:ac1725ba162c	44	*/
segundo	0:ac1725ba162c	45
segundo	0:ac1725ba162c	46	#include "lwip/opt.h"
segundo	0:ac1725ba162c	47
segundo	0:ac1725ba162c	48	#if LWIP_ARP \|\| LWIP_ETHERNET
segundo	0:ac1725ba162c	49
segundo	0:ac1725ba162c	50	#include "lwip/ip_addr.h"
segundo	0:ac1725ba162c	51	#include "lwip/def.h"
segundo	0:ac1725ba162c	52	#include "lwip/ip.h"
segundo	0:ac1725ba162c	53	#include "lwip/stats.h"
segundo	0:ac1725ba162c	54	#include "lwip/snmp.h"
segundo	0:ac1725ba162c	55	#include "lwip/dhcp.h"
segundo	0:ac1725ba162c	56	#include "lwip/autoip.h"
segundo	0:ac1725ba162c	57	#include "netif/etharp.h"
segundo	0:ac1725ba162c	58
segundo	0:ac1725ba162c	59	#if PPPOE_SUPPORT
segundo	0:ac1725ba162c	60	#include "netif/ppp_oe.h"
segundo	0:ac1725ba162c	61	#endif /* PPPOE_SUPPORT */
segundo	0:ac1725ba162c	62
segundo	0:ac1725ba162c	63	#include <string.h>
segundo	0:ac1725ba162c	64
segundo	0:ac1725ba162c	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
segundo	0:ac1725ba162c	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
segundo	0:ac1725ba162c	67
segundo	0:ac1725ba162c	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
segundo	0:ac1725ba162c	69
segundo	0:ac1725ba162c	70	/** the time an ARP entry stays valid after its last update,
segundo	0:ac1725ba162c	71	* for ARP_TMR_INTERVAL = 5000, this is
segundo	0:ac1725ba162c	72	* (240 * 5) seconds = 20 minutes.
segundo	0:ac1725ba162c	73	*/
segundo	0:ac1725ba162c	74	#define ARP_MAXAGE 240
segundo	0:ac1725ba162c	75	/** the time an ARP entry stays pending after first request,
segundo	0:ac1725ba162c	76	* for ARP_TMR_INTERVAL = 5000, this is
segundo	0:ac1725ba162c	77	* (2 * 5) seconds = 10 seconds.
segundo	0:ac1725ba162c	78	*
segundo	0:ac1725ba162c	79	* @internal Keep this number at least 2, otherwise it might
segundo	0:ac1725ba162c	80	* run out instantly if the timeout occurs directly after a request.
segundo	0:ac1725ba162c	81	*/
segundo	0:ac1725ba162c	82	#define ARP_MAXPENDING 2
segundo	0:ac1725ba162c	83
segundo	0:ac1725ba162c	84	#define HWTYPE_ETHERNET 1
segundo	0:ac1725ba162c	85
segundo	0:ac1725ba162c	86	enum etharp_state {
segundo	0:ac1725ba162c	87	ETHARP_STATE_EMPTY = 0,
segundo	0:ac1725ba162c	88	ETHARP_STATE_PENDING,
segundo	0:ac1725ba162c	89	ETHARP_STATE_STABLE
segundo	0:ac1725ba162c	90	};
segundo	0:ac1725ba162c	91
segundo	0:ac1725ba162c	92	struct etharp_entry {
segundo	0:ac1725ba162c	93	#if ARP_QUEUEING
segundo	0:ac1725ba162c	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
segundo	0:ac1725ba162c	95	struct etharp_q_entry *q;
segundo	0:ac1725ba162c	96	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	97	ip_addr_t ipaddr;
segundo	0:ac1725ba162c	98	struct eth_addr ethaddr;
segundo	0:ac1725ba162c	99	#if LWIP_SNMP
segundo	0:ac1725ba162c	100	struct netif *netif;
segundo	0:ac1725ba162c	101	#endif /* LWIP_SNMP */
segundo	0:ac1725ba162c	102	u8_t state;
segundo	0:ac1725ba162c	103	u8_t ctime;
segundo	0:ac1725ba162c	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	105	u8_t static_entry;
segundo	0:ac1725ba162c	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	107	};
segundo	0:ac1725ba162c	108
segundo	0:ac1725ba162c	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
segundo	0:ac1725ba162c	110
segundo	0:ac1725ba162c	111	#if !LWIP_NETIF_HWADDRHINT
segundo	0:ac1725ba162c	112	static u8_t etharp_cached_entry;
segundo	0:ac1725ba162c	113	#endif /* !LWIP_NETIF_HWADDRHINT */
segundo	0:ac1725ba162c	114
segundo	0:ac1725ba162c	115	/** Try hard to create a new entry - we want the IP address to appear in
segundo	0:ac1725ba162c	116	the cache (even if this means removing an active entry or so). */
segundo	0:ac1725ba162c	117	#define ETHARP_FLAG_TRY_HARD 1
segundo	0:ac1725ba162c	118	#define ETHARP_FLAG_FIND_ONLY 2
segundo	0:ac1725ba162c	119	#define ETHARP_FLAG_STATIC_ENTRY 4
segundo	0:ac1725ba162c	120
segundo	0:ac1725ba162c	121	#if LWIP_NETIF_HWADDRHINT
segundo	0:ac1725ba162c	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
segundo	0:ac1725ba162c	123	*((netif)->addr_hint) = (hint);
segundo	0:ac1725ba162c	124	#else /* LWIP_NETIF_HWADDRHINT */
segundo	0:ac1725ba162c	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
segundo	0:ac1725ba162c	126	#endif /* LWIP_NETIF_HWADDRHINT */
segundo	0:ac1725ba162c	127
segundo	0:ac1725ba162c	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
segundo	0:ac1725ba162c	129
segundo	0:ac1725ba162c	130
segundo	0:ac1725ba162c	131	/* Some checks, instead of etharp_init(): */
segundo	0:ac1725ba162c	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
segundo	0:ac1725ba162c	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
segundo	0:ac1725ba162c	134	#endif
segundo	0:ac1725ba162c	135
segundo	0:ac1725ba162c	136
segundo	0:ac1725ba162c	137	#if ARP_QUEUEING
segundo	0:ac1725ba162c	138	/**
segundo	0:ac1725ba162c	139	* Free a complete queue of etharp entries
segundo	0:ac1725ba162c	140	*
segundo	0:ac1725ba162c	141	* @param q a qeueue of etharp_q_entry's to free
segundo	0:ac1725ba162c	142	*/
segundo	0:ac1725ba162c	143	static void
segundo	0:ac1725ba162c	144	free_etharp_q(struct etharp_q_entry *q)
segundo	0:ac1725ba162c	145	{
segundo	0:ac1725ba162c	146	struct etharp_q_entry *r;
segundo	0:ac1725ba162c	147	LWIP_ASSERT("q != NULL", q != NULL);
segundo	0:ac1725ba162c	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
segundo	0:ac1725ba162c	149	while (q) {
segundo	0:ac1725ba162c	150	r = q;
segundo	0:ac1725ba162c	151	q = q->next;
segundo	0:ac1725ba162c	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
segundo	0:ac1725ba162c	153	pbuf_free(r->p);
segundo	0:ac1725ba162c	154	memp_free(MEMP_ARP_QUEUE, r);
segundo	0:ac1725ba162c	155	}
segundo	0:ac1725ba162c	156	}
segundo	0:ac1725ba162c	157	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	158
segundo	0:ac1725ba162c	159	/** Clean up ARP table entries */
segundo	0:ac1725ba162c	160	static void
segundo	0:ac1725ba162c	161	free_entry(int i)
segundo	0:ac1725ba162c	162	{
segundo	0:ac1725ba162c	163	/* remove from SNMP ARP index tree */
segundo	0:ac1725ba162c	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
segundo	0:ac1725ba162c	165	#if ARP_QUEUEING
segundo	0:ac1725ba162c	166	/* and empty packet queue */
segundo	0:ac1725ba162c	167	if (arp_table[i].q != NULL) {
segundo	0:ac1725ba162c	168	/* remove all queued packets */
segundo	0:ac1725ba162c	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
segundo	0:ac1725ba162c	170	free_etharp_q(arp_table[i].q);
segundo	0:ac1725ba162c	171	arp_table[i].q = NULL;
segundo	0:ac1725ba162c	172	}
segundo	0:ac1725ba162c	173	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	174	/* recycle entry for re-use */
segundo	0:ac1725ba162c	175	arp_table[i].state = ETHARP_STATE_EMPTY;
segundo	0:ac1725ba162c	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	177	arp_table[i].static_entry = 0;
segundo	0:ac1725ba162c	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	179	#ifdef LWIP_DEBUG
segundo	0:ac1725ba162c	180	/* for debugging, clean out the complete entry */
segundo	0:ac1725ba162c	181	arp_table[i].ctime = 0;
segundo	0:ac1725ba162c	182	#if LWIP_SNMP
segundo	0:ac1725ba162c	183	arp_table[i].netif = NULL;
segundo	0:ac1725ba162c	184	#endif /* LWIP_SNMP */
segundo	0:ac1725ba162c	185	ip_addr_set_zero(&arp_table[i].ipaddr);
segundo	0:ac1725ba162c	186	arp_table[i].ethaddr = ethzero;
segundo	0:ac1725ba162c	187	#endif /* LWIP_DEBUG */
segundo	0:ac1725ba162c	188	}
segundo	0:ac1725ba162c	189
segundo	0:ac1725ba162c	190	/**
segundo	0:ac1725ba162c	191	* Clears expired entries in the ARP table.
segundo	0:ac1725ba162c	192	*
segundo	0:ac1725ba162c	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
segundo	0:ac1725ba162c	194	* in order to expire entries in the ARP table.
segundo	0:ac1725ba162c	195	*/
segundo	0:ac1725ba162c	196	void
segundo	0:ac1725ba162c	197	etharp_tmr(void)
segundo	0:ac1725ba162c	198	{
segundo	0:ac1725ba162c	199	u8_t i;
segundo	0:ac1725ba162c	200
segundo	0:ac1725ba162c	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
segundo	0:ac1725ba162c	202	/* remove expired entries from the ARP table */
segundo	0:ac1725ba162c	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
segundo	0:ac1725ba162c	204	u8_t state = arp_table[i].state;
segundo	0:ac1725ba162c	205	if (state != ETHARP_STATE_EMPTY
segundo	0:ac1725ba162c	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	207	&& (arp_table[i].static_entry == 0)
segundo	0:ac1725ba162c	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	209	) {
segundo	0:ac1725ba162c	210	arp_table[i].ctime++;
segundo	0:ac1725ba162c	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
segundo	0:ac1725ba162c	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
segundo	0:ac1725ba162c	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
segundo	0:ac1725ba162c	214	/* pending or stable entry has become old! */
segundo	0:ac1725ba162c	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
segundo	0:ac1725ba162c	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
segundo	0:ac1725ba162c	217	/* clean up entries that have just been expired */
segundo	0:ac1725ba162c	218	free_entry(i);
segundo	0:ac1725ba162c	219	}
segundo	0:ac1725ba162c	220	#if ARP_QUEUEING
segundo	0:ac1725ba162c	221	/* still pending entry? (not expired) */
segundo	0:ac1725ba162c	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
segundo	0:ac1725ba162c	223	/* resend an ARP query here? */
segundo	0:ac1725ba162c	224	}
segundo	0:ac1725ba162c	225	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	226	}
segundo	0:ac1725ba162c	227	}
segundo	0:ac1725ba162c	228	}
segundo	0:ac1725ba162c	229
segundo	0:ac1725ba162c	230	/**
segundo	0:ac1725ba162c	231	* Search the ARP table for a matching or new entry.
segundo	0:ac1725ba162c	232	*
segundo	0:ac1725ba162c	233	* If an IP address is given, return a pending or stable ARP entry that matches
segundo	0:ac1725ba162c	234	* the address. If no match is found, create a new entry with this address set,
segundo	0:ac1725ba162c	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
segundo	0:ac1725ba162c	236	* state of the returned entry.
segundo	0:ac1725ba162c	237	*
segundo	0:ac1725ba162c	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
segundo	0:ac1725ba162c	239	*
segundo	0:ac1725ba162c	240	* In all cases, attempt to create new entries from an empty entry. If no
segundo	0:ac1725ba162c	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
segundo	0:ac1725ba162c	242	* old entries. Heuristic choose the least important entry for recycling.
segundo	0:ac1725ba162c	243	*
segundo	0:ac1725ba162c	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
segundo	0:ac1725ba162c	245	* @param flags @see definition of ETHARP_FLAG_*
segundo	0:ac1725ba162c	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
segundo	0:ac1725ba162c	247	*
segundo	0:ac1725ba162c	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
segundo	0:ac1725ba162c	249	* entry is found or could be recycled.
segundo	0:ac1725ba162c	250	*/
segundo	0:ac1725ba162c	251	static s8_t
segundo	0:ac1725ba162c	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
segundo	0:ac1725ba162c	253	{
segundo	0:ac1725ba162c	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
segundo	0:ac1725ba162c	255	s8_t empty = ARP_TABLE_SIZE;
segundo	0:ac1725ba162c	256	u8_t i = 0, age_pending = 0, age_stable = 0;
segundo	0:ac1725ba162c	257	#if ARP_QUEUEING
segundo	0:ac1725ba162c	258	/* oldest entry with packets on queue */
segundo	0:ac1725ba162c	259	s8_t old_queue = ARP_TABLE_SIZE;
segundo	0:ac1725ba162c	260	/* its age */
segundo	0:ac1725ba162c	261	u8_t age_queue = 0;
segundo	0:ac1725ba162c	262	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	263
segundo	0:ac1725ba162c	264	/**
segundo	0:ac1725ba162c	265	* a) do a search through the cache, remember candidates
segundo	0:ac1725ba162c	266	* b) select candidate entry
segundo	0:ac1725ba162c	267	* c) create new entry
segundo	0:ac1725ba162c	268	*/
segundo	0:ac1725ba162c	269
segundo	0:ac1725ba162c	270	/* a) in a single search sweep, do all of this
segundo	0:ac1725ba162c	271	* 1) remember the first empty entry (if any)
segundo	0:ac1725ba162c	272	* 2) remember the oldest stable entry (if any)
segundo	0:ac1725ba162c	273	* 3) remember the oldest pending entry without queued packets (if any)
segundo	0:ac1725ba162c	274	* 4) remember the oldest pending entry with queued packets (if any)
segundo	0:ac1725ba162c	275	* 5) search for a matching IP entry, either pending or stable
segundo	0:ac1725ba162c	276	* until 5 matches, or all entries are searched for.
segundo	0:ac1725ba162c	277	*/
segundo	0:ac1725ba162c	278
segundo	0:ac1725ba162c	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
segundo	0:ac1725ba162c	280	u8_t state = arp_table[i].state;
segundo	0:ac1725ba162c	281	/* no empty entry found yet and now we do find one? */
segundo	0:ac1725ba162c	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
segundo	0:ac1725ba162c	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
segundo	0:ac1725ba162c	284	/* remember first empty entry */
segundo	0:ac1725ba162c	285	empty = i;
segundo	0:ac1725ba162c	286	} else if (state != ETHARP_STATE_EMPTY) {
segundo	0:ac1725ba162c	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
segundo	0:ac1725ba162c	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
segundo	0:ac1725ba162c	289	/* if given, does IP address match IP address in ARP entry? */
segundo	0:ac1725ba162c	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
segundo	0:ac1725ba162c	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
segundo	0:ac1725ba162c	292	/* found exact IP address match, simply bail out */
segundo	0:ac1725ba162c	293	return i;
segundo	0:ac1725ba162c	294	}
segundo	0:ac1725ba162c	295	/* pending entry? */
segundo	0:ac1725ba162c	296	if (state == ETHARP_STATE_PENDING) {
segundo	0:ac1725ba162c	297	/* pending with queued packets? */
segundo	0:ac1725ba162c	298	#if ARP_QUEUEING
segundo	0:ac1725ba162c	299	if (arp_table[i].q != NULL) {
segundo	0:ac1725ba162c	300	if (arp_table[i].ctime >= age_queue) {
segundo	0:ac1725ba162c	301	old_queue = i;
segundo	0:ac1725ba162c	302	age_queue = arp_table[i].ctime;
segundo	0:ac1725ba162c	303	}
segundo	0:ac1725ba162c	304	} else
segundo	0:ac1725ba162c	305	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	306	/* pending without queued packets? */
segundo	0:ac1725ba162c	307	{
segundo	0:ac1725ba162c	308	if (arp_table[i].ctime >= age_pending) {
segundo	0:ac1725ba162c	309	old_pending = i;
segundo	0:ac1725ba162c	310	age_pending = arp_table[i].ctime;
segundo	0:ac1725ba162c	311	}
segundo	0:ac1725ba162c	312	}
segundo	0:ac1725ba162c	313	/* stable entry? */
segundo	0:ac1725ba162c	314	} else if (state == ETHARP_STATE_STABLE) {
segundo	0:ac1725ba162c	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	316	/* don't record old_stable for static entries since they never expire */
segundo	0:ac1725ba162c	317	if (arp_table[i].static_entry == 0)
segundo	0:ac1725ba162c	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	319	{
segundo	0:ac1725ba162c	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
segundo	0:ac1725ba162c	321	if (arp_table[i].ctime >= age_stable) {
segundo	0:ac1725ba162c	322	old_stable = i;
segundo	0:ac1725ba162c	323	age_stable = arp_table[i].ctime;
segundo	0:ac1725ba162c	324	}
segundo	0:ac1725ba162c	325	}
segundo	0:ac1725ba162c	326	}
segundo	0:ac1725ba162c	327	}
segundo	0:ac1725ba162c	328	}
segundo	0:ac1725ba162c	329	/* { we have no match } => try to create a new entry */
segundo	0:ac1725ba162c	330
segundo	0:ac1725ba162c	331	/* don't create new entry, only search? */
segundo	0:ac1725ba162c	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
segundo	0:ac1725ba162c	333	/* or no empty entry found and not allowed to recycle? */
segundo	0:ac1725ba162c	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
segundo	0:ac1725ba162c	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
segundo	0:ac1725ba162c	336	return (s8_t)ERR_MEM;
segundo	0:ac1725ba162c	337	}
segundo	0:ac1725ba162c	338
segundo	0:ac1725ba162c	339	/* b) choose the least destructive entry to recycle:
segundo	0:ac1725ba162c	340	* 1) empty entry
segundo	0:ac1725ba162c	341	* 2) oldest stable entry
segundo	0:ac1725ba162c	342	* 3) oldest pending entry without queued packets
segundo	0:ac1725ba162c	343	* 4) oldest pending entry with queued packets
segundo	0:ac1725ba162c	344	*
segundo	0:ac1725ba162c	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
segundo	0:ac1725ba162c	346	*/
segundo	0:ac1725ba162c	347
segundo	0:ac1725ba162c	348	/* 1) empty entry available? */
segundo	0:ac1725ba162c	349	if (empty < ARP_TABLE_SIZE) {
segundo	0:ac1725ba162c	350	i = empty;
segundo	0:ac1725ba162c	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
segundo	0:ac1725ba162c	352	} else {
segundo	0:ac1725ba162c	353	/* 2) found recyclable stable entry? */
segundo	0:ac1725ba162c	354	if (old_stable < ARP_TABLE_SIZE) {
segundo	0:ac1725ba162c	355	/* recycle oldest stable*/
segundo	0:ac1725ba162c	356	i = old_stable;
segundo	0:ac1725ba162c	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
segundo	0:ac1725ba162c	358	#if ARP_QUEUEING
segundo	0:ac1725ba162c	359	/* no queued packets should exist on stable entries */
segundo	0:ac1725ba162c	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
segundo	0:ac1725ba162c	361	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	362	/* 3) found recyclable pending entry without queued packets? */
segundo	0:ac1725ba162c	363	} else if (old_pending < ARP_TABLE_SIZE) {
segundo	0:ac1725ba162c	364	/* recycle oldest pending */
segundo	0:ac1725ba162c	365	i = old_pending;
segundo	0:ac1725ba162c	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
segundo	0:ac1725ba162c	367	#if ARP_QUEUEING
segundo	0:ac1725ba162c	368	/* 4) found recyclable pending entry with queued packets? */
segundo	0:ac1725ba162c	369	} else if (old_queue < ARP_TABLE_SIZE) {
segundo	0:ac1725ba162c	370	/* recycle oldest pending (queued packets are free in free_entry) */
segundo	0:ac1725ba162c	371	i = old_queue;
segundo	0:ac1725ba162c	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)));
segundo	0:ac1725ba162c	373	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	374	/* no empty or recyclable entries found */
segundo	0:ac1725ba162c	375	} else {
segundo	0:ac1725ba162c	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
segundo	0:ac1725ba162c	377	return (s8_t)ERR_MEM;
segundo	0:ac1725ba162c	378	}
segundo	0:ac1725ba162c	379
segundo	0:ac1725ba162c	380	/* { empty or recyclable entry found } */
segundo	0:ac1725ba162c	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
segundo	0:ac1725ba162c	382	free_entry(i);
segundo	0:ac1725ba162c	383	}
segundo	0:ac1725ba162c	384
segundo	0:ac1725ba162c	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
segundo	0:ac1725ba162c	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
segundo	0:ac1725ba162c	387	arp_table[i].state == ETHARP_STATE_EMPTY);
segundo	0:ac1725ba162c	388
segundo	0:ac1725ba162c	389	/* IP address given? */
segundo	0:ac1725ba162c	390	if (ipaddr != NULL) {
segundo	0:ac1725ba162c	391	/* set IP address */
segundo	0:ac1725ba162c	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
segundo	0:ac1725ba162c	393	}
segundo	0:ac1725ba162c	394	arp_table[i].ctime = 0;
segundo	0:ac1725ba162c	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	396	arp_table[i].static_entry = 0;
segundo	0:ac1725ba162c	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	398	return (err_t)i;
segundo	0:ac1725ba162c	399	}
segundo	0:ac1725ba162c	400
segundo	0:ac1725ba162c	401	/**
segundo	0:ac1725ba162c	402	* Send an IP packet on the network using netif->linkoutput
segundo	0:ac1725ba162c	403	* The ethernet header is filled in before sending.
segundo	0:ac1725ba162c	404	*
segundo	0:ac1725ba162c	405	* @params netif the lwIP network interface on which to send the packet
segundo	0:ac1725ba162c	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
segundo	0:ac1725ba162c	407	* @params src the source MAC address to be copied into the ethernet header
segundo	0:ac1725ba162c	408	* @params dst the destination MAC address to be copied into the ethernet header
segundo	0:ac1725ba162c	409	* @return ERR_OK if the packet was sent, any other err_t on failure
segundo	0:ac1725ba162c	410	*/
segundo	0:ac1725ba162c	411	static err_t
segundo	0:ac1725ba162c	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
segundo	0:ac1725ba162c	413	{
segundo	0:ac1725ba162c	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
segundo	0:ac1725ba162c	415
segundo	0:ac1725ba162c	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
segundo	0:ac1725ba162c	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
segundo	0:ac1725ba162c	418	ETHADDR32_COPY(&ethhdr->dest, dst);
segundo	0:ac1725ba162c	419	ETHADDR16_COPY(&ethhdr->src, src);
segundo	0:ac1725ba162c	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
segundo	0:ac1725ba162c	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
segundo	0:ac1725ba162c	422	/* send the packet */
segundo	0:ac1725ba162c	423	return netif->linkoutput(netif, p);
segundo	0:ac1725ba162c	424	}
segundo	0:ac1725ba162c	425
segundo	0:ac1725ba162c	426	/**
segundo	0:ac1725ba162c	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
segundo	0:ac1725ba162c	428	*
segundo	0:ac1725ba162c	429	* If a pending entry is resolved, any queued packets will be sent
segundo	0:ac1725ba162c	430	* at this point.
segundo	0:ac1725ba162c	431	*
segundo	0:ac1725ba162c	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
segundo	0:ac1725ba162c	433	* @param ipaddr IP address of the inserted ARP entry.
segundo	0:ac1725ba162c	434	* @param ethaddr Ethernet address of the inserted ARP entry.
segundo	0:ac1725ba162c	435	* @param flags @see definition of ETHARP_FLAG_*
segundo	0:ac1725ba162c	436	*
segundo	0:ac1725ba162c	437	* @return
segundo	0:ac1725ba162c	438	* - ERR_OK Succesfully updated ARP cache.
segundo	0:ac1725ba162c	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
segundo	0:ac1725ba162c	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
segundo	0:ac1725ba162c	441	*
segundo	0:ac1725ba162c	442	* @see pbuf_free()
segundo	0:ac1725ba162c	443	*/
segundo	0:ac1725ba162c	444	static err_t
segundo	0:ac1725ba162c	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
segundo	0:ac1725ba162c	446	{
segundo	0:ac1725ba162c	447	s8_t i;
segundo	0:ac1725ba162c	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
segundo	0:ac1725ba162c	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",
segundo	0:ac1725ba162c	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
segundo	0:ac1725ba162c	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
segundo	0:ac1725ba162c	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
segundo	0:ac1725ba162c	453	/* non-unicast address? */
segundo	0:ac1725ba162c	454	if (ip_addr_isany(ipaddr) \|\|
segundo	0:ac1725ba162c	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
segundo	0:ac1725ba162c	456	ip_addr_ismulticast(ipaddr)) {
segundo	0:ac1725ba162c	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
segundo	0:ac1725ba162c	458	return ERR_ARG;
segundo	0:ac1725ba162c	459	}
segundo	0:ac1725ba162c	460	/* find or create ARP entry */
segundo	0:ac1725ba162c	461	i = find_entry(ipaddr, flags);
segundo	0:ac1725ba162c	462	/* bail out if no entry could be found */
segundo	0:ac1725ba162c	463	if (i < 0) {
segundo	0:ac1725ba162c	464	return (err_t)i;
segundo	0:ac1725ba162c	465	}
segundo	0:ac1725ba162c	466
segundo	0:ac1725ba162c	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
segundo	0:ac1725ba162c	469	/* record static type */
segundo	0:ac1725ba162c	470	arp_table[i].static_entry = 1;
segundo	0:ac1725ba162c	471	}
segundo	0:ac1725ba162c	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	473
segundo	0:ac1725ba162c	474	/* mark it stable */
segundo	0:ac1725ba162c	475	arp_table[i].state = ETHARP_STATE_STABLE;
segundo	0:ac1725ba162c	476
segundo	0:ac1725ba162c	477	#if LWIP_SNMP
segundo	0:ac1725ba162c	478	/* record network interface */
segundo	0:ac1725ba162c	479	arp_table[i].netif = netif;
segundo	0:ac1725ba162c	480	#endif /* LWIP_SNMP */
segundo	0:ac1725ba162c	481	/* insert in SNMP ARP index tree */
segundo	0:ac1725ba162c	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
segundo	0:ac1725ba162c	483
segundo	0:ac1725ba162c	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
segundo	0:ac1725ba162c	485	/* update address */
segundo	0:ac1725ba162c	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
segundo	0:ac1725ba162c	487	/* reset time stamp */
segundo	0:ac1725ba162c	488	arp_table[i].ctime = 0;
segundo	0:ac1725ba162c	489	#if ARP_QUEUEING
segundo	0:ac1725ba162c	490	/* this is where we will send out queued packets! */
segundo	0:ac1725ba162c	491	while (arp_table[i].q != NULL) {
segundo	0:ac1725ba162c	492	struct pbuf *p;
segundo	0:ac1725ba162c	493	/* remember remainder of queue */
segundo	0:ac1725ba162c	494	struct etharp_q_entry *q = arp_table[i].q;
segundo	0:ac1725ba162c	495	/* pop first item off the queue */
segundo	0:ac1725ba162c	496	arp_table[i].q = q->next;
segundo	0:ac1725ba162c	497	/* get the packet pointer */
segundo	0:ac1725ba162c	498	p = q->p;
segundo	0:ac1725ba162c	499	/* now queue entry can be freed */
segundo	0:ac1725ba162c	500	memp_free(MEMP_ARP_QUEUE, q);
segundo	0:ac1725ba162c	501	/* send the queued IP packet */
segundo	0:ac1725ba162c	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
segundo	0:ac1725ba162c	503	/* free the queued IP packet */
segundo	0:ac1725ba162c	504	pbuf_free(p);
segundo	0:ac1725ba162c	505	}
segundo	0:ac1725ba162c	506	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	507	return ERR_OK;
segundo	0:ac1725ba162c	508	}
segundo	0:ac1725ba162c	509
segundo	0:ac1725ba162c	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
segundo	0:ac1725ba162c	511	/** Add a new static entry to the ARP table. If an entry exists for the
segundo	0:ac1725ba162c	512	* specified IP address, this entry is overwritten.
segundo	0:ac1725ba162c	513	* If packets are queued for the specified IP address, they are sent out.
segundo	0:ac1725ba162c	514	*
segundo	0:ac1725ba162c	515	* @param ipaddr IP address for the new static entry
segundo	0:ac1725ba162c	516	* @param ethaddr ethernet address for the new static entry
segundo	0:ac1725ba162c	517	* @return @see return values of etharp_add_static_entry
segundo	0:ac1725ba162c	518	*/
segundo	0:ac1725ba162c	519	err_t
segundo	0:ac1725ba162c	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
segundo	0:ac1725ba162c	521	{
segundo	0:ac1725ba162c	522	struct netif *netif;
segundo	0:ac1725ba162c	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",
segundo	0:ac1725ba162c	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
segundo	0:ac1725ba162c	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
segundo	0:ac1725ba162c	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
segundo	0:ac1725ba162c	527
segundo	0:ac1725ba162c	528	netif = ip_route(ipaddr);
segundo	0:ac1725ba162c	529	if (netif == NULL) {
segundo	0:ac1725ba162c	530	return ERR_RTE;
segundo	0:ac1725ba162c	531	}
segundo	0:ac1725ba162c	532
segundo	0:ac1725ba162c	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
segundo	0:ac1725ba162c	534	}
segundo	0:ac1725ba162c	535
segundo	0:ac1725ba162c	536	/** Remove a static entry from the ARP table previously added with a call to
segundo	0:ac1725ba162c	537	* etharp_add_static_entry.
segundo	0:ac1725ba162c	538	*
segundo	0:ac1725ba162c	539	* @param ipaddr IP address of the static entry to remove
segundo	0:ac1725ba162c	540	* @return ERR_OK: entry removed
segundo	0:ac1725ba162c	541	* ERR_MEM: entry wasn't found
segundo	0:ac1725ba162c	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
segundo	0:ac1725ba162c	543	*/
segundo	0:ac1725ba162c	544	err_t
segundo	0:ac1725ba162c	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
segundo	0:ac1725ba162c	546	{
segundo	0:ac1725ba162c	547	s8_t i;
segundo	0:ac1725ba162c	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
segundo	0:ac1725ba162c	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
segundo	0:ac1725ba162c	550
segundo	0:ac1725ba162c	551	/* find or create ARP entry */
segundo	0:ac1725ba162c	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
segundo	0:ac1725ba162c	553	/* bail out if no entry could be found */
segundo	0:ac1725ba162c	554	if (i < 0) {
segundo	0:ac1725ba162c	555	return (err_t)i;
segundo	0:ac1725ba162c	556	}
segundo	0:ac1725ba162c	557
segundo	0:ac1725ba162c	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
segundo	0:ac1725ba162c	559	(arp_table[i].static_entry == 0)) {
segundo	0:ac1725ba162c	560	/* entry wasn't a static entry, cannot remove it */
segundo	0:ac1725ba162c	561	return ERR_ARG;
segundo	0:ac1725ba162c	562	}
segundo	0:ac1725ba162c	563	/* entry found, free it */
segundo	0:ac1725ba162c	564	free_entry(i);
segundo	0:ac1725ba162c	565	return ERR_OK;
segundo	0:ac1725ba162c	566	}
segundo	0:ac1725ba162c	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
segundo	0:ac1725ba162c	568
segundo	0:ac1725ba162c	569	/**
segundo	0:ac1725ba162c	570	* Finds (stable) ethernet/IP address pair from ARP table
segundo	0:ac1725ba162c	571	* using interface and IP address index.
segundo	0:ac1725ba162c	572	* @note the addresses in the ARP table are in network order!
segundo	0:ac1725ba162c	573	*
segundo	0:ac1725ba162c	574	* @param netif points to interface index
segundo	0:ac1725ba162c	575	* @param ipaddr points to the (network order) IP address index
segundo	0:ac1725ba162c	576	* @param eth_ret points to return pointer
segundo	0:ac1725ba162c	577	* @param ip_ret points to return pointer
segundo	0:ac1725ba162c	578	* @return table index if found, -1 otherwise
segundo	0:ac1725ba162c	579	*/
segundo	0:ac1725ba162c	580	s8_t
segundo	0:ac1725ba162c	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
segundo	0:ac1725ba162c	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
segundo	0:ac1725ba162c	583	{
segundo	0:ac1725ba162c	584	s8_t i;
segundo	0:ac1725ba162c	585
segundo	0:ac1725ba162c	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
segundo	0:ac1725ba162c	587	eth_ret != NULL && ip_ret != NULL);
segundo	0:ac1725ba162c	588
segundo	0:ac1725ba162c	589	LWIP_UNUSED_ARG(netif);
segundo	0:ac1725ba162c	590
segundo	0:ac1725ba162c	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
segundo	0:ac1725ba162c	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
segundo	0:ac1725ba162c	593	*eth_ret = &arp_table[i].ethaddr;
segundo	0:ac1725ba162c	594	*ip_ret = &arp_table[i].ipaddr;
segundo	0:ac1725ba162c	595	return i;
segundo	0:ac1725ba162c	596	}
segundo	0:ac1725ba162c	597	return -1;
segundo	0:ac1725ba162c	598	}
segundo	0:ac1725ba162c	599
segundo	0:ac1725ba162c	600	#if ETHARP_TRUST_IP_MAC
segundo	0:ac1725ba162c	601	/**
segundo	0:ac1725ba162c	602	* Updates the ARP table using the given IP packet.
segundo	0:ac1725ba162c	603	*
segundo	0:ac1725ba162c	604	* Uses the incoming IP packet's source address to update the
segundo	0:ac1725ba162c	605	* ARP cache for the local network. The function does not alter
segundo	0:ac1725ba162c	606	* or free the packet. This function must be called before the
segundo	0:ac1725ba162c	607	* packet p is passed to the IP layer.
segundo	0:ac1725ba162c	608	*
segundo	0:ac1725ba162c	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
segundo	0:ac1725ba162c	610	* @param p The IP packet that arrived on netif.
segundo	0:ac1725ba162c	611	*
segundo	0:ac1725ba162c	612	* @return NULL
segundo	0:ac1725ba162c	613	*
segundo	0:ac1725ba162c	614	* @see pbuf_free()
segundo	0:ac1725ba162c	615	*/
segundo	0:ac1725ba162c	616	static void
segundo	0:ac1725ba162c	617	etharp_ip_input(struct netif netif, struct pbuf p)
segundo	0:ac1725ba162c	618	{
segundo	0:ac1725ba162c	619	struct eth_hdr *ethhdr;
segundo	0:ac1725ba162c	620	struct ip_hdr *iphdr;
segundo	0:ac1725ba162c	621	ip_addr_t iphdr_src;
segundo	0:ac1725ba162c	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
segundo	0:ac1725ba162c	623
segundo	0:ac1725ba162c	624	/* Only insert an entry if the source IP address of the
segundo	0:ac1725ba162c	625	incoming IP packet comes from a host on the local network. */
segundo	0:ac1725ba162c	626	ethhdr = (struct eth_hdr *)p->payload;
segundo	0:ac1725ba162c	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
segundo	0:ac1725ba162c	628	#if ETHARP_SUPPORT_VLAN
segundo	0:ac1725ba162c	629	if (ethhdr->type == ETHTYPE_VLAN) {
segundo	0:ac1725ba162c	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
segundo	0:ac1725ba162c	631	}
segundo	0:ac1725ba162c	632	#endif /* ETHARP_SUPPORT_VLAN */
segundo	0:ac1725ba162c	633
segundo	0:ac1725ba162c	634	ip_addr_copy(iphdr_src, iphdr->src);
segundo	0:ac1725ba162c	635
segundo	0:ac1725ba162c	636	/* source is not on the local network? */
segundo	0:ac1725ba162c	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
segundo	0:ac1725ba162c	638	/* do nothing */
segundo	0:ac1725ba162c	639	return;
segundo	0:ac1725ba162c	640	}
segundo	0:ac1725ba162c	641
segundo	0:ac1725ba162c	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
segundo	0:ac1725ba162c	643	/* update the source IP address in the cache, if present */
segundo	0:ac1725ba162c	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
segundo	0:ac1725ba162c	645	* back soon (for example, if the destination IP address is ours. */
segundo	0:ac1725ba162c	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
segundo	0:ac1725ba162c	647	}
segundo	0:ac1725ba162c	648	#endif /* ETHARP_TRUST_IP_MAC */
segundo	0:ac1725ba162c	649
segundo	0:ac1725ba162c	650	/**
segundo	0:ac1725ba162c	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
segundo	0:ac1725ba162c	652	* send out queued IP packets. Updates cache with snooped address pairs.
segundo	0:ac1725ba162c	653	*
segundo	0:ac1725ba162c	654	* Should be called for incoming ARP packets. The pbuf in the argument
segundo	0:ac1725ba162c	655	* is freed by this function.
segundo	0:ac1725ba162c	656	*
segundo	0:ac1725ba162c	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
segundo	0:ac1725ba162c	658	* @param ethaddr Ethernet address of netif.
segundo	0:ac1725ba162c	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
segundo	0:ac1725ba162c	660	*
segundo	0:ac1725ba162c	661	* @return NULL
segundo	0:ac1725ba162c	662	*
segundo	0:ac1725ba162c	663	* @see pbuf_free()
segundo	0:ac1725ba162c	664	*/
segundo	0:ac1725ba162c	665	static void
segundo	0:ac1725ba162c	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
segundo	0:ac1725ba162c	667	{
segundo	0:ac1725ba162c	668	struct etharp_hdr *hdr;
segundo	0:ac1725ba162c	669	struct eth_hdr *ethhdr;
segundo	0:ac1725ba162c	670	/* these are aligned properly, whereas the ARP header fields might not be */
segundo	0:ac1725ba162c	671	ip_addr_t sipaddr, dipaddr;
segundo	0:ac1725ba162c	672	u8_t for_us;
segundo	0:ac1725ba162c	673	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	674	const u8_t * ethdst_hwaddr;
segundo	0:ac1725ba162c	675	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	676
segundo	0:ac1725ba162c	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
segundo	0:ac1725ba162c	678
segundo	0:ac1725ba162c	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
segundo	0:ac1725ba162c	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
segundo	0:ac1725ba162c	681	if (p->len < SIZEOF_ETHARP_PACKET) {
segundo	0:ac1725ba162c	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
segundo	0:ac1725ba162c	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
segundo	0:ac1725ba162c	684	(s16_t)SIZEOF_ETHARP_PACKET));
segundo	0:ac1725ba162c	685	ETHARP_STATS_INC(etharp.lenerr);
segundo	0:ac1725ba162c	686	ETHARP_STATS_INC(etharp.drop);
segundo	0:ac1725ba162c	687	pbuf_free(p);
segundo	0:ac1725ba162c	688	return;
segundo	0:ac1725ba162c	689	}
segundo	0:ac1725ba162c	690
segundo	0:ac1725ba162c	691	ethhdr = (struct eth_hdr *)p->payload;
segundo	0:ac1725ba162c	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
segundo	0:ac1725ba162c	693	#if ETHARP_SUPPORT_VLAN
segundo	0:ac1725ba162c	694	if (ethhdr->type == ETHTYPE_VLAN) {
segundo	0:ac1725ba162c	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
segundo	0:ac1725ba162c	696	}
segundo	0:ac1725ba162c	697	#endif /* ETHARP_SUPPORT_VLAN */
segundo	0:ac1725ba162c	698
segundo	0:ac1725ba162c	699	/* RFC 826 "Packet Reception": */
segundo	0:ac1725ba162c	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
segundo	0:ac1725ba162c	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
segundo	0:ac1725ba162c	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
segundo	0:ac1725ba162c	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
segundo	0:ac1725ba162c	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
segundo	0:ac1725ba162c	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
segundo	0:ac1725ba162c	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",
segundo	0:ac1725ba162c	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
segundo	0:ac1725ba162c	708	ETHARP_STATS_INC(etharp.proterr);
segundo	0:ac1725ba162c	709	ETHARP_STATS_INC(etharp.drop);
segundo	0:ac1725ba162c	710	pbuf_free(p);
segundo	0:ac1725ba162c	711	return;
segundo	0:ac1725ba162c	712	}
segundo	0:ac1725ba162c	713	ETHARP_STATS_INC(etharp.recv);
segundo	0:ac1725ba162c	714
segundo	0:ac1725ba162c	715	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	716	/* We have to check if a host already has configured our random
segundo	0:ac1725ba162c	717	* created link local address and continously check if there is
segundo	0:ac1725ba162c	718	* a host with this IP-address so we can detect collisions */
segundo	0:ac1725ba162c	719	autoip_arp_reply(netif, hdr);
segundo	0:ac1725ba162c	720	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	721
segundo	0:ac1725ba162c	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
segundo	0:ac1725ba162c	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
segundo	0:ac1725ba162c	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
segundo	0:ac1725ba162c	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
segundo	0:ac1725ba162c	726
segundo	0:ac1725ba162c	727	/* this interface is not configured? */
segundo	0:ac1725ba162c	728	if (ip_addr_isany(&netif->ip_addr)) {
segundo	0:ac1725ba162c	729	for_us = 0;
segundo	0:ac1725ba162c	730	} else {
segundo	0:ac1725ba162c	731	/* ARP packet directed to us? */
segundo	0:ac1725ba162c	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
segundo	0:ac1725ba162c	733	}
segundo	0:ac1725ba162c	734
segundo	0:ac1725ba162c	735	/* ARP message directed to us?
segundo	0:ac1725ba162c	736	-> add IP address in ARP cache; assume requester wants to talk to us,
segundo	0:ac1725ba162c	737	can result in directly sending the queued packets for this host.
segundo	0:ac1725ba162c	738	ARP message not directed to us?
segundo	0:ac1725ba162c	739	-> update the source IP address in the cache, if present */
segundo	0:ac1725ba162c	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
segundo	0:ac1725ba162c	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
segundo	0:ac1725ba162c	742
segundo	0:ac1725ba162c	743	/* now act on the message itself */
segundo	0:ac1725ba162c	744	switch (hdr->opcode) {
segundo	0:ac1725ba162c	745	/* ARP request? */
segundo	0:ac1725ba162c	746	case PP_HTONS(ARP_REQUEST):
segundo	0:ac1725ba162c	747	/* ARP request. If it asked for our address, we send out a
segundo	0:ac1725ba162c	748	* reply. In any case, we time-stamp any existing ARP entry,
segundo	0:ac1725ba162c	749	* and possiby send out an IP packet that was queued on it. */
segundo	0:ac1725ba162c	750
segundo	0:ac1725ba162c	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
segundo	0:ac1725ba162c	752	/* ARP request for our address? */
segundo	0:ac1725ba162c	753	if (for_us) {
segundo	0:ac1725ba162c	754
segundo	0:ac1725ba162c	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
segundo	0:ac1725ba162c	756	/* Re-use pbuf to send ARP reply.
segundo	0:ac1725ba162c	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
segundo	0:ac1725ba162c	758	that would allocate a new pbuf. */
segundo	0:ac1725ba162c	759	hdr->opcode = htons(ARP_REPLY);
segundo	0:ac1725ba162c	760
segundo	0:ac1725ba162c	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
segundo	0:ac1725ba162c	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
segundo	0:ac1725ba162c	763
segundo	0:ac1725ba162c	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
segundo	0:ac1725ba162c	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
segundo	0:ac1725ba162c	766	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
segundo	0:ac1725ba162c	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
segundo	0:ac1725ba162c	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
segundo	0:ac1725ba162c	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
segundo	0:ac1725ba162c	771	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	772
segundo	0:ac1725ba162c	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
segundo	0:ac1725ba162c	774	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
segundo	0:ac1725ba162c	776	#else /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
segundo	0:ac1725ba162c	778	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
segundo	0:ac1725ba162c	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
segundo	0:ac1725ba162c	781
segundo	0:ac1725ba162c	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
segundo	0:ac1725ba162c	783	are already correct, we tested that before */
segundo	0:ac1725ba162c	784
segundo	0:ac1725ba162c	785	/* return ARP reply */
segundo	0:ac1725ba162c	786	netif->linkoutput(netif, p);
segundo	0:ac1725ba162c	787	/* we are not configured? */
segundo	0:ac1725ba162c	788	} else if (ip_addr_isany(&netif->ip_addr)) {
segundo	0:ac1725ba162c	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
segundo	0:ac1725ba162c	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
segundo	0:ac1725ba162c	791	/* request was not directed to us */
segundo	0:ac1725ba162c	792	} else {
segundo	0:ac1725ba162c	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
segundo	0:ac1725ba162c	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
segundo	0:ac1725ba162c	795	}
segundo	0:ac1725ba162c	796	break;
segundo	0:ac1725ba162c	797	case PP_HTONS(ARP_REPLY):
segundo	0:ac1725ba162c	798	/* ARP reply. We already updated the ARP cache earlier. */
segundo	0:ac1725ba162c	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
segundo	0:ac1725ba162c	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
segundo	0:ac1725ba162c	801	/* DHCP wants to know about ARP replies from any host with an
segundo	0:ac1725ba162c	802	* IP address also offered to us by the DHCP server. We do not
segundo	0:ac1725ba162c	803	* want to take a duplicate IP address on a single network.
segundo	0:ac1725ba162c	804	* @todo How should we handle redundant (fail-over) interfaces? */
segundo	0:ac1725ba162c	805	dhcp_arp_reply(netif, &sipaddr);
segundo	0:ac1725ba162c	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
segundo	0:ac1725ba162c	807	break;
segundo	0:ac1725ba162c	808	default:
segundo	0:ac1725ba162c	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
segundo	0:ac1725ba162c	810	ETHARP_STATS_INC(etharp.err);
segundo	0:ac1725ba162c	811	break;
segundo	0:ac1725ba162c	812	}
segundo	0:ac1725ba162c	813	/* free ARP packet */
segundo	0:ac1725ba162c	814	pbuf_free(p);
segundo	0:ac1725ba162c	815	}
segundo	0:ac1725ba162c	816
segundo	0:ac1725ba162c	817	/**
segundo	0:ac1725ba162c	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
segundo	0:ac1725ba162c	819	*
segundo	0:ac1725ba162c	820	* For IP multicast and broadcast, corresponding Ethernet addresses
segundo	0:ac1725ba162c	821	* are selected and the packet is transmitted on the link.
segundo	0:ac1725ba162c	822	*
segundo	0:ac1725ba162c	823	* For unicast addresses, the packet is submitted to etharp_query(). In
segundo	0:ac1725ba162c	824	* case the IP address is outside the local network, the IP address of
segundo	0:ac1725ba162c	825	* the gateway is used.
segundo	0:ac1725ba162c	826	*
segundo	0:ac1725ba162c	827	* @param netif The lwIP network interface which the IP packet will be sent on.
segundo	0:ac1725ba162c	828	* @param q The pbuf(s) containing the IP packet to be sent.
segundo	0:ac1725ba162c	829	* @param ipaddr The IP address of the packet destination.
segundo	0:ac1725ba162c	830	*
segundo	0:ac1725ba162c	831	* @return
segundo	0:ac1725ba162c	832	* - ERR_RTE No route to destination (no gateway to external networks),
segundo	0:ac1725ba162c	833	* or the return type of either etharp_query() or etharp_send_ip().
segundo	0:ac1725ba162c	834	*/
segundo	0:ac1725ba162c	835	err_t
segundo	0:ac1725ba162c	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
segundo	0:ac1725ba162c	837	{
segundo	0:ac1725ba162c	838	struct eth_addr *dest, mcastaddr;
segundo	0:ac1725ba162c	839
segundo	0:ac1725ba162c	840	/* make room for Ethernet header - should not fail */
segundo	0:ac1725ba162c	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
segundo	0:ac1725ba162c	842	/* bail out */
segundo	0:ac1725ba162c	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
segundo	0:ac1725ba162c	844	("etharp_output: could not allocate room for header.\n"));
segundo	0:ac1725ba162c	845	LINK_STATS_INC(link.lenerr);
segundo	0:ac1725ba162c	846	return ERR_BUF;
segundo	0:ac1725ba162c	847	}
segundo	0:ac1725ba162c	848
segundo	0:ac1725ba162c	849	/* assume unresolved Ethernet address */
segundo	0:ac1725ba162c	850	dest = NULL;
segundo	0:ac1725ba162c	851	/* Determine on destination hardware address. Broadcasts and multicasts
segundo	0:ac1725ba162c	852	* are special, other IP addresses are looked up in the ARP table. */
segundo	0:ac1725ba162c	853
segundo	0:ac1725ba162c	854	/* broadcast destination IP address? */
segundo	0:ac1725ba162c	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
segundo	0:ac1725ba162c	856	/* broadcast on Ethernet also */
segundo	0:ac1725ba162c	857	dest = (struct eth_addr *)&ethbroadcast;
segundo	0:ac1725ba162c	858	/* multicast destination IP address? */
segundo	0:ac1725ba162c	859	} else if (ip_addr_ismulticast(ipaddr)) {
segundo	0:ac1725ba162c	860	/* Hash IP multicast address to MAC address.*/
segundo	0:ac1725ba162c	861	mcastaddr.addr[0] = 0x01;
segundo	0:ac1725ba162c	862	mcastaddr.addr[1] = 0x00;
segundo	0:ac1725ba162c	863	mcastaddr.addr[2] = 0x5e;
segundo	0:ac1725ba162c	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
segundo	0:ac1725ba162c	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
segundo	0:ac1725ba162c	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
segundo	0:ac1725ba162c	867	/* destination Ethernet address is multicast */
segundo	0:ac1725ba162c	868	dest = &mcastaddr;
segundo	0:ac1725ba162c	869	/* unicast destination IP address? */
segundo	0:ac1725ba162c	870	} else {
segundo	0:ac1725ba162c	871	/* outside local network? */
segundo	0:ac1725ba162c	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
segundo	0:ac1725ba162c	873	!ip_addr_islinklocal(ipaddr)) {
segundo	0:ac1725ba162c	874	/* interface has default gateway? */
segundo	0:ac1725ba162c	875	if (!ip_addr_isany(&netif->gw)) {
segundo	0:ac1725ba162c	876	/* send to hardware address of default gateway IP address */
segundo	0:ac1725ba162c	877	ipaddr = &(netif->gw);
segundo	0:ac1725ba162c	878	/* no default gateway available */
segundo	0:ac1725ba162c	879	} else {
segundo	0:ac1725ba162c	880	/* no route to destination error (default gateway missing) */
segundo	0:ac1725ba162c	881	return ERR_RTE;
segundo	0:ac1725ba162c	882	}
segundo	0:ac1725ba162c	883	}
segundo	0:ac1725ba162c	884	#if LWIP_NETIF_HWADDRHINT
segundo	0:ac1725ba162c	885	if (netif->addr_hint != NULL) {
segundo	0:ac1725ba162c	886	/* per-pcb cached entry was given */
segundo	0:ac1725ba162c	887	u8_t etharp_cached_entry = *(netif->addr_hint);
segundo	0:ac1725ba162c	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
segundo	0:ac1725ba162c	889	#endif /* LWIP_NETIF_HWADDRHINT */
segundo	0:ac1725ba162c	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
segundo	0:ac1725ba162c	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
segundo	0:ac1725ba162c	892	/* the per-pcb-cached entry is stable and the right one! */
segundo	0:ac1725ba162c	893	ETHARP_STATS_INC(etharp.cachehit);
segundo	0:ac1725ba162c	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
segundo	0:ac1725ba162c	895	&arp_table[etharp_cached_entry].ethaddr);
segundo	0:ac1725ba162c	896	}
segundo	0:ac1725ba162c	897	#if LWIP_NETIF_HWADDRHINT
segundo	0:ac1725ba162c	898	}
segundo	0:ac1725ba162c	899	}
segundo	0:ac1725ba162c	900	#endif /* LWIP_NETIF_HWADDRHINT */
segundo	0:ac1725ba162c	901	/* queue on destination Ethernet address belonging to ipaddr */
segundo	0:ac1725ba162c	902	return etharp_query(netif, ipaddr, q);
segundo	0:ac1725ba162c	903	}
segundo	0:ac1725ba162c	904
segundo	0:ac1725ba162c	905	/* continuation for multicast/broadcast destinations */
segundo	0:ac1725ba162c	906	/* obtain source Ethernet address of the given interface */
segundo	0:ac1725ba162c	907	/* send packet directly on the link */
segundo	0:ac1725ba162c	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
segundo	0:ac1725ba162c	909	}
segundo	0:ac1725ba162c	910
segundo	0:ac1725ba162c	911	/**
segundo	0:ac1725ba162c	912	* Send an ARP request for the given IP address and/or queue a packet.
segundo	0:ac1725ba162c	913	*
segundo	0:ac1725ba162c	914	* If the IP address was not yet in the cache, a pending ARP cache entry
segundo	0:ac1725ba162c	915	* is added and an ARP request is sent for the given address. The packet
segundo	0:ac1725ba162c	916	* is queued on this entry.
segundo	0:ac1725ba162c	917	*
segundo	0:ac1725ba162c	918	* If the IP address was already pending in the cache, a new ARP request
segundo	0:ac1725ba162c	919	* is sent for the given address. The packet is queued on this entry.
segundo	0:ac1725ba162c	920	*
segundo	0:ac1725ba162c	921	* If the IP address was already stable in the cache, and a packet is
segundo	0:ac1725ba162c	922	* given, it is directly sent and no ARP request is sent out.
segundo	0:ac1725ba162c	923	*
segundo	0:ac1725ba162c	924	* If the IP address was already stable in the cache, and no packet is
segundo	0:ac1725ba162c	925	* given, an ARP request is sent out.
segundo	0:ac1725ba162c	926	*
segundo	0:ac1725ba162c	927	* @param netif The lwIP network interface on which ipaddr
segundo	0:ac1725ba162c	928	* must be queried for.
segundo	0:ac1725ba162c	929	* @param ipaddr The IP address to be resolved.
segundo	0:ac1725ba162c	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
segundo	0:ac1725ba162c	931	* q is not freed by this function.
segundo	0:ac1725ba162c	932	*
segundo	0:ac1725ba162c	933	* @note q must only be ONE packet, not a packet queue!
segundo	0:ac1725ba162c	934	*
segundo	0:ac1725ba162c	935	* @return
segundo	0:ac1725ba162c	936	* - ERR_BUF Could not make room for Ethernet header.
segundo	0:ac1725ba162c	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
segundo	0:ac1725ba162c	938	* to query for address or queue the packet.
segundo	0:ac1725ba162c	939	* - ERR_MEM Could not queue packet due to memory shortage.
segundo	0:ac1725ba162c	940	* - ERR_RTE No route to destination (no gateway to external networks).
segundo	0:ac1725ba162c	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
segundo	0:ac1725ba162c	942	*
segundo	0:ac1725ba162c	943	*/
segundo	0:ac1725ba162c	944	err_t
segundo	0:ac1725ba162c	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
segundo	0:ac1725ba162c	946	{
segundo	0:ac1725ba162c	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
segundo	0:ac1725ba162c	948	err_t result = ERR_MEM;
segundo	0:ac1725ba162c	949	s8_t i; /* ARP entry index */
segundo	0:ac1725ba162c	950
segundo	0:ac1725ba162c	951	/* non-unicast address? */
segundo	0:ac1725ba162c	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
segundo	0:ac1725ba162c	953	ip_addr_ismulticast(ipaddr) \|\|
segundo	0:ac1725ba162c	954	ip_addr_isany(ipaddr)) {
segundo	0:ac1725ba162c	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
segundo	0:ac1725ba162c	956	return ERR_ARG;
segundo	0:ac1725ba162c	957	}
segundo	0:ac1725ba162c	958
segundo	0:ac1725ba162c	959	/* find entry in ARP cache, ask to create entry if queueing packet */
segundo	0:ac1725ba162c	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
segundo	0:ac1725ba162c	961
segundo	0:ac1725ba162c	962	/* could not find or create entry? */
segundo	0:ac1725ba162c	963	if (i < 0) {
segundo	0:ac1725ba162c	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
segundo	0:ac1725ba162c	965	if (q) {
segundo	0:ac1725ba162c	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
segundo	0:ac1725ba162c	967	ETHARP_STATS_INC(etharp.memerr);
segundo	0:ac1725ba162c	968	}
segundo	0:ac1725ba162c	969	return (err_t)i;
segundo	0:ac1725ba162c	970	}
segundo	0:ac1725ba162c	971
segundo	0:ac1725ba162c	972	/* mark a fresh entry as pending (we just sent a request) */
segundo	0:ac1725ba162c	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
segundo	0:ac1725ba162c	974	arp_table[i].state = ETHARP_STATE_PENDING;
segundo	0:ac1725ba162c	975	}
segundo	0:ac1725ba162c	976
segundo	0:ac1725ba162c	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
segundo	0:ac1725ba162c	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
segundo	0:ac1725ba162c	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
segundo	0:ac1725ba162c	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
segundo	0:ac1725ba162c	981
segundo	0:ac1725ba162c	982	/* do we have a pending entry? or an implicit query request? */
segundo	0:ac1725ba162c	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
segundo	0:ac1725ba162c	984	/* try to resolve it; send out ARP request */
segundo	0:ac1725ba162c	985	result = etharp_request(netif, ipaddr);
segundo	0:ac1725ba162c	986	if (result != ERR_OK) {
segundo	0:ac1725ba162c	987	/* ARP request couldn't be sent */
segundo	0:ac1725ba162c	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
segundo	0:ac1725ba162c	989	since this failure could be temporary, and the next packet calling
segundo	0:ac1725ba162c	990	etharp_query again could lead to sending the queued packets. */
segundo	0:ac1725ba162c	991	}
segundo	0:ac1725ba162c	992	if (q == NULL) {
segundo	0:ac1725ba162c	993	return result;
segundo	0:ac1725ba162c	994	}
segundo	0:ac1725ba162c	995	}
segundo	0:ac1725ba162c	996
segundo	0:ac1725ba162c	997	/* packet given? */
segundo	0:ac1725ba162c	998	LWIP_ASSERT("q != NULL", q != NULL);
segundo	0:ac1725ba162c	999	/* stable entry? */
segundo	0:ac1725ba162c	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
segundo	0:ac1725ba162c	1001	/* we have a valid IP->Ethernet address mapping */
segundo	0:ac1725ba162c	1002	ETHARP_SET_HINT(netif, i);
segundo	0:ac1725ba162c	1003	/* send the packet */
segundo	0:ac1725ba162c	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
segundo	0:ac1725ba162c	1005	/* pending entry? (either just created or already pending */
segundo	0:ac1725ba162c	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
segundo	0:ac1725ba162c	1007	#if ARP_QUEUEING /* queue the given q packet */
segundo	0:ac1725ba162c	1008	struct pbuf *p;
segundo	0:ac1725ba162c	1009	int copy_needed = 0;
segundo	0:ac1725ba162c	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
segundo	0:ac1725ba162c	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
segundo	0:ac1725ba162c	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
segundo	0:ac1725ba162c	1013	p = q;
segundo	0:ac1725ba162c	1014	while (p) {
segundo	0:ac1725ba162c	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
segundo	0:ac1725ba162c	1016	if(p->type != PBUF_ROM) {
segundo	0:ac1725ba162c	1017	copy_needed = 1;
segundo	0:ac1725ba162c	1018	break;
segundo	0:ac1725ba162c	1019	}
segundo	0:ac1725ba162c	1020	p = p->next;
segundo	0:ac1725ba162c	1021	}
segundo	0:ac1725ba162c	1022	if(copy_needed) {
segundo	0:ac1725ba162c	1023	/* copy the whole packet into new pbufs */
segundo	0:ac1725ba162c	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
segundo	0:ac1725ba162c	1025	if(p != NULL) {
segundo	0:ac1725ba162c	1026	if (pbuf_copy(p, q) != ERR_OK) {
segundo	0:ac1725ba162c	1027	pbuf_free(p);
segundo	0:ac1725ba162c	1028	p = NULL;
segundo	0:ac1725ba162c	1029	}
segundo	0:ac1725ba162c	1030	}
segundo	0:ac1725ba162c	1031	} else {
segundo	0:ac1725ba162c	1032	/* referencing the old pbuf is enough */
segundo	0:ac1725ba162c	1033	p = q;
segundo	0:ac1725ba162c	1034	pbuf_ref(p);
segundo	0:ac1725ba162c	1035	}
segundo	0:ac1725ba162c	1036	/* packet could be taken over? */
segundo	0:ac1725ba162c	1037	if (p != NULL) {
segundo	0:ac1725ba162c	1038	/* queue packet ... */
segundo	0:ac1725ba162c	1039	struct etharp_q_entry *new_entry;
segundo	0:ac1725ba162c	1040	/* allocate a new arp queue entry */
segundo	0:ac1725ba162c	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
segundo	0:ac1725ba162c	1042	if (new_entry != NULL) {
segundo	0:ac1725ba162c	1043	new_entry->next = 0;
segundo	0:ac1725ba162c	1044	new_entry->p = p;
segundo	0:ac1725ba162c	1045	if(arp_table[i].q != NULL) {
segundo	0:ac1725ba162c	1046	/* queue was already existent, append the new entry to the end */
segundo	0:ac1725ba162c	1047	struct etharp_q_entry *r;
segundo	0:ac1725ba162c	1048	r = arp_table[i].q;
segundo	0:ac1725ba162c	1049	while (r->next != NULL) {
segundo	0:ac1725ba162c	1050	r = r->next;
segundo	0:ac1725ba162c	1051	}
segundo	0:ac1725ba162c	1052	r->next = new_entry;
segundo	0:ac1725ba162c	1053	} else {
segundo	0:ac1725ba162c	1054	/* queue did not exist, first item in queue */
segundo	0:ac1725ba162c	1055	arp_table[i].q = new_entry;
segundo	0:ac1725ba162c	1056	}
segundo	0:ac1725ba162c	1057	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
segundo	0:ac1725ba162c	1058	result = ERR_OK;
segundo	0:ac1725ba162c	1059	} else {
segundo	0:ac1725ba162c	1060	/* the pool MEMP_ARP_QUEUE is empty */
segundo	0:ac1725ba162c	1061	pbuf_free(p);
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	1063	/* { result == ERR_MEM } through initialization */
segundo	0:ac1725ba162c	1064	}
segundo	0:ac1725ba162c	1065	} else {
segundo	0:ac1725ba162c	1066	ETHARP_STATS_INC(etharp.memerr);
segundo	0:ac1725ba162c	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));
segundo	0:ac1725ba162c	1068	/* { result == ERR_MEM } through initialization */
segundo	0:ac1725ba162c	1069	}
segundo	0:ac1725ba162c	1070	#else /* ARP_QUEUEING */
segundo	0:ac1725ba162c	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
segundo	0:ac1725ba162c	1072	/* { result == ERR_MEM } through initialization */
segundo	0:ac1725ba162c	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
segundo	0:ac1725ba162c	1074	#endif /* ARP_QUEUEING */
segundo	0:ac1725ba162c	1075	}
segundo	0:ac1725ba162c	1076	return result;
segundo	0:ac1725ba162c	1077	}
segundo	0:ac1725ba162c	1078
segundo	0:ac1725ba162c	1079	/**
segundo	0:ac1725ba162c	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
segundo	0:ac1725ba162c	1081	*
segundo	0:ac1725ba162c	1082	* @param netif the lwip network interface on which to send the ARP packet
segundo	0:ac1725ba162c	1083	* @param ethsrc_addr the source MAC address for the ethernet header
segundo	0:ac1725ba162c	1084	* @param ethdst_addr the destination MAC address for the ethernet header
segundo	0:ac1725ba162c	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
segundo	0:ac1725ba162c	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
segundo	0:ac1725ba162c	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
segundo	0:ac1725ba162c	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
segundo	0:ac1725ba162c	1089	* @param opcode the type of the ARP packet
segundo	0:ac1725ba162c	1090	* @return ERR_OK if the ARP packet has been sent
segundo	0:ac1725ba162c	1091	* ERR_MEM if the ARP packet couldn't be allocated
segundo	0:ac1725ba162c	1092	* any other err_t on failure
segundo	0:ac1725ba162c	1093	*/
segundo	0:ac1725ba162c	1094	#if !LWIP_AUTOIP
segundo	0:ac1725ba162c	1095	static
segundo	0:ac1725ba162c	1096	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	1097	err_t
segundo	0:ac1725ba162c	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
segundo	0:ac1725ba162c	1099	const struct eth_addr *ethdst_addr,
segundo	0:ac1725ba162c	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
segundo	0:ac1725ba162c	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
segundo	0:ac1725ba162c	1102	const u16_t opcode)
segundo	0:ac1725ba162c	1103	{
segundo	0:ac1725ba162c	1104	struct pbuf *p;
segundo	0:ac1725ba162c	1105	err_t result = ERR_OK;
segundo	0:ac1725ba162c	1106	struct eth_hdr *ethhdr;
segundo	0:ac1725ba162c	1107	struct etharp_hdr *hdr;
segundo	0:ac1725ba162c	1108	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	1109	const u8_t * ethdst_hwaddr;
segundo	0:ac1725ba162c	1110	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	1111
segundo	0:ac1725ba162c	1112	/* allocate a pbuf for the outgoing ARP request packet */
segundo	0:ac1725ba162c	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
segundo	0:ac1725ba162c	1114	/* could allocate a pbuf for an ARP request? */
segundo	0:ac1725ba162c	1115	if (p == NULL) {
segundo	0:ac1725ba162c	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
segundo	0:ac1725ba162c	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
segundo	0:ac1725ba162c	1118	ETHARP_STATS_INC(etharp.memerr);
segundo	0:ac1725ba162c	1119	return ERR_MEM;
segundo	0:ac1725ba162c	1120	}
segundo	0:ac1725ba162c	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
segundo	0:ac1725ba162c	1122	(p->len >= SIZEOF_ETHARP_PACKET));
segundo	0:ac1725ba162c	1123
segundo	0:ac1725ba162c	1124	ethhdr = (struct eth_hdr *)p->payload;
segundo	0:ac1725ba162c	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
segundo	0:ac1725ba162c	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
segundo	0:ac1725ba162c	1127	hdr->opcode = htons(opcode);
segundo	0:ac1725ba162c	1128
segundo	0:ac1725ba162c	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
segundo	0:ac1725ba162c	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
segundo	0:ac1725ba162c	1131	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
segundo	0:ac1725ba162c	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
segundo	0:ac1725ba162c	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
segundo	0:ac1725ba162c	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
segundo	0:ac1725ba162c	1136	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	1137	/* Write the ARP MAC-Addresses */
segundo	0:ac1725ba162c	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
segundo	0:ac1725ba162c	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
segundo	0:ac1725ba162c	1140	/* Write the Ethernet MAC-Addresses */
segundo	0:ac1725ba162c	1141	#if LWIP_AUTOIP
segundo	0:ac1725ba162c	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
segundo	0:ac1725ba162c	1143	#else /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
segundo	0:ac1725ba162c	1145	#endif /* LWIP_AUTOIP */
segundo	0:ac1725ba162c	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
segundo	0:ac1725ba162c	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
segundo	0:ac1725ba162c	1148	* structure packing. */
segundo	0:ac1725ba162c	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
segundo	0:ac1725ba162c	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
segundo	0:ac1725ba162c	1151
segundo	0:ac1725ba162c	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
segundo	0:ac1725ba162c	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
segundo	0:ac1725ba162c	1154	/* set hwlen and protolen */
segundo	0:ac1725ba162c	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
segundo	0:ac1725ba162c	1156	hdr->protolen = sizeof(ip_addr_t);
segundo	0:ac1725ba162c	1157
segundo	0:ac1725ba162c	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
segundo	0:ac1725ba162c	1159	/* send ARP query */
segundo	0:ac1725ba162c	1160	result = netif->linkoutput(netif, p);
segundo	0:ac1725ba162c	1161	ETHARP_STATS_INC(etharp.xmit);
segundo	0:ac1725ba162c	1162	/* free ARP query packet */
segundo	0:ac1725ba162c	1163	pbuf_free(p);
segundo	0:ac1725ba162c	1164	p = NULL;
segundo	0:ac1725ba162c	1165	/* could not allocate pbuf for ARP request */
segundo	0:ac1725ba162c	1166
segundo	0:ac1725ba162c	1167	return result;
segundo	0:ac1725ba162c	1168	}
segundo	0:ac1725ba162c	1169
segundo	0:ac1725ba162c	1170	/**
segundo	0:ac1725ba162c	1171	* Send an ARP request packet asking for ipaddr.
segundo	0:ac1725ba162c	1172	*
segundo	0:ac1725ba162c	1173	* @param netif the lwip network interface on which to send the request
segundo	0:ac1725ba162c	1174	* @param ipaddr the IP address for which to ask
segundo	0:ac1725ba162c	1175	* @return ERR_OK if the request has been sent
segundo	0:ac1725ba162c	1176	* ERR_MEM if the ARP packet couldn't be allocated
segundo	0:ac1725ba162c	1177	* any other err_t on failure
segundo	0:ac1725ba162c	1178	*/
segundo	0:ac1725ba162c	1179	err_t
segundo	0:ac1725ba162c	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
segundo	0:ac1725ba162c	1181	{
segundo	0:ac1725ba162c	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
segundo	0:ac1725ba162c	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
segundo	0:ac1725ba162c	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
segundo	0:ac1725ba162c	1185	ipaddr, ARP_REQUEST);
segundo	0:ac1725ba162c	1186	}
segundo	0:ac1725ba162c	1187	#endif /* LWIP_ARP */
segundo	0:ac1725ba162c	1188
segundo	0:ac1725ba162c	1189	/**
segundo	0:ac1725ba162c	1190	* Process received ethernet frames. Using this function instead of directly
segundo	0:ac1725ba162c	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
segundo	0:ac1725ba162c	1192	* the ARP cache is protected from concurrent access.
segundo	0:ac1725ba162c	1193	*
segundo	0:ac1725ba162c	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
segundo	0:ac1725ba162c	1195	* @param netif the network interface on which the packet was received
segundo	0:ac1725ba162c	1196	*/
segundo	0:ac1725ba162c	1197	err_t
segundo	0:ac1725ba162c	1198	ethernet_input(struct pbuf p, struct netif netif)
segundo	0:ac1725ba162c	1199	{
segundo	0:ac1725ba162c	1200	struct eth_hdr* ethhdr;
segundo	0:ac1725ba162c	1201	u16_t type;
segundo	0:ac1725ba162c	1202
segundo	0:ac1725ba162c	1203	/* points to packet payload, which starts with an Ethernet header */
segundo	0:ac1725ba162c	1204	ethhdr = (struct eth_hdr *)p->payload;
segundo	0:ac1725ba162c	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
segundo	0:ac1725ba162c	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",
segundo	0:ac1725ba162c	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
segundo	0:ac1725ba162c	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
segundo	0:ac1725ba162c	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
segundo	0:ac1725ba162c	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
segundo	0:ac1725ba162c	1211	(unsigned)htons(ethhdr->type)));
segundo	0:ac1725ba162c	1212
segundo	0:ac1725ba162c	1213	type = ethhdr->type;
segundo	0:ac1725ba162c	1214	#if ETHARP_SUPPORT_VLAN
segundo	0:ac1725ba162c	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
segundo	0:ac1725ba162c	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
segundo	0:ac1725ba162c	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
segundo	0:ac1725ba162c	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
segundo	0:ac1725ba162c	1219	/* silently ignore this packet: not for our VLAN */
segundo	0:ac1725ba162c	1220	pbuf_free(p);
segundo	0:ac1725ba162c	1221	return ERR_OK;
segundo	0:ac1725ba162c	1222	}
segundo	0:ac1725ba162c	1223	#endif /* ETHARP_VLAN_CHECK */
segundo	0:ac1725ba162c	1224	type = vlan->tpid;
segundo	0:ac1725ba162c	1225	}
segundo	0:ac1725ba162c	1226	#endif /* ETHARP_SUPPORT_VLAN */
segundo	0:ac1725ba162c	1227
segundo	0:ac1725ba162c	1228	#if LWIP_ARP_FILTER_NETIF
segundo	0:ac1725ba162c	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
segundo	0:ac1725ba162c	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
segundo	0:ac1725ba162c	1231
segundo	0:ac1725ba162c	1232	switch (type) {
segundo	0:ac1725ba162c	1233	#if LWIP_ARP
segundo	0:ac1725ba162c	1234	/* IP packet? */
segundo	0:ac1725ba162c	1235	case PP_HTONS(ETHTYPE_IP):
segundo	0:ac1725ba162c	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
segundo	0:ac1725ba162c	1237	goto free_and_return;
segundo	0:ac1725ba162c	1238	}
segundo	0:ac1725ba162c	1239	#if ETHARP_TRUST_IP_MAC
segundo	0:ac1725ba162c	1240	/* update ARP table */
segundo	0:ac1725ba162c	1241	etharp_ip_input(netif, p);
segundo	0:ac1725ba162c	1242	#endif /* ETHARP_TRUST_IP_MAC */
segundo	0:ac1725ba162c	1243	/* skip Ethernet header */
segundo	0:ac1725ba162c	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
segundo	0:ac1725ba162c	1245	LWIP_ASSERT("Can't move over header in packet", 0);
segundo	0:ac1725ba162c	1246	goto free_and_return;
segundo	0:ac1725ba162c	1247	} else {
segundo	0:ac1725ba162c	1248	/* pass to IP layer */
segundo	0:ac1725ba162c	1249	ip_input(p, netif);
segundo	0:ac1725ba162c	1250	}
segundo	0:ac1725ba162c	1251	break;
segundo	0:ac1725ba162c	1252
segundo	0:ac1725ba162c	1253	case PP_HTONS(ETHTYPE_ARP):
segundo	0:ac1725ba162c	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
segundo	0:ac1725ba162c	1255	goto free_and_return;
segundo	0:ac1725ba162c	1256	}
segundo	0:ac1725ba162c	1257	/* pass p to ARP module */
segundo	0:ac1725ba162c	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
segundo	0:ac1725ba162c	1259	break;
segundo	0:ac1725ba162c	1260	#endif /* LWIP_ARP */
segundo	0:ac1725ba162c	1261	#if PPPOE_SUPPORT
segundo	0:ac1725ba162c	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
segundo	0:ac1725ba162c	1263	pppoe_disc_input(netif, p);
segundo	0:ac1725ba162c	1264	break;
segundo	0:ac1725ba162c	1265
segundo	0:ac1725ba162c	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
segundo	0:ac1725ba162c	1267	pppoe_data_input(netif, p);
segundo	0:ac1725ba162c	1268	break;
segundo	0:ac1725ba162c	1269	#endif /* PPPOE_SUPPORT */
segundo	0:ac1725ba162c	1270
segundo	0:ac1725ba162c	1271	default:
segundo	0:ac1725ba162c	1272	ETHARP_STATS_INC(etharp.proterr);
segundo	0:ac1725ba162c	1273	ETHARP_STATS_INC(etharp.drop);
segundo	0:ac1725ba162c	1274	goto free_and_return;
segundo	0:ac1725ba162c	1275	}
segundo	0:ac1725ba162c	1276
segundo	0:ac1725ba162c	1277	/* This means the pbuf is freed or consumed,
segundo	0:ac1725ba162c	1278	so the caller doesn't have to free it again */
segundo	0:ac1725ba162c	1279	return ERR_OK;
segundo	0:ac1725ba162c	1280
segundo	0:ac1725ba162c	1281	free_and_return:
segundo	0:ac1725ba162c	1282	pbuf_free(p);
segundo	0:ac1725ba162c	1283	return ERR_OK;
segundo	0:ac1725ba162c	1284	}
segundo	0:ac1725ba162c	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Library
Created:	06 Mar 2013
Imports:	0
Forks:	0
Commits:	9
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lwip/netif/etharp.c@0:ac1725ba162c, 2010-11-09 (annotated)

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