ZG2100NetIfSource - ZG2100 Network interface source

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ZG2100 Network interface source

lwip/netif/etharp.c@4:e00281c7453d, 2010-08-06 (annotated)

Committer:: donatien
Date:: Fri Aug 06 10:46:03 2010 +0000
Revision:: 4:e00281c7453d
Parent:: 1:3a7c15057192

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:b802fc31f1db	1	/**
donatien	0:b802fc31f1db	2	* @file
donatien	0:b802fc31f1db	3	* Address Resolution Protocol module for IP over Ethernet
donatien	0:b802fc31f1db	4	*
donatien	0:b802fc31f1db	5	* Functionally, ARP is divided into two parts. The first maps an IP address
donatien	0:b802fc31f1db	6	* to a physical address when sending a packet, and the second part answers
donatien	0:b802fc31f1db	7	* requests from other machines for our physical address.
donatien	0:b802fc31f1db	8	*
donatien	0:b802fc31f1db	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
donatien	0:b802fc31f1db	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
donatien	0:b802fc31f1db	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
donatien	0:b802fc31f1db	12	*/
donatien	0:b802fc31f1db	13
donatien	0:b802fc31f1db	14	/*
donatien	0:b802fc31f1db	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
donatien	0:b802fc31f1db	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
donatien	0:b802fc31f1db	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
donatien	0:b802fc31f1db	18	* All rights reserved.
donatien	0:b802fc31f1db	19	*
donatien	0:b802fc31f1db	20	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:b802fc31f1db	21	* are permitted provided that the following conditions are met:
donatien	0:b802fc31f1db	22	*
donatien	0:b802fc31f1db	23	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:b802fc31f1db	24	* this list of conditions and the following disclaimer.
donatien	0:b802fc31f1db	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:b802fc31f1db	26	* this list of conditions and the following disclaimer in the documentation
donatien	0:b802fc31f1db	27	* and/or other materials provided with the distribution.
donatien	0:b802fc31f1db	28	* 3. The name of the author may not be used to endorse or promote products
donatien	0:b802fc31f1db	29	* derived from this software without specific prior written permission.
donatien	0:b802fc31f1db	30	*
donatien	0:b802fc31f1db	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:b802fc31f1db	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:b802fc31f1db	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:b802fc31f1db	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:b802fc31f1db	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:b802fc31f1db	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:b802fc31f1db	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:b802fc31f1db	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:b802fc31f1db	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:b802fc31f1db	40	* OF SUCH DAMAGE.
donatien	0:b802fc31f1db	41	*
donatien	0:b802fc31f1db	42	* This file is part of the lwIP TCP/IP stack.
donatien	0:b802fc31f1db	43	*
donatien	0:b802fc31f1db	44	*/
donatien	0:b802fc31f1db	45
donatien	0:b802fc31f1db	46	#include "lwip/opt.h"
donatien	0:b802fc31f1db	47
donatien	0:b802fc31f1db	48	#if LWIP_ARP \|\| LWIP_ETHERNET
donatien	0:b802fc31f1db	49
donatien	0:b802fc31f1db	50	#include "lwip/ip_addr.h"
donatien	0:b802fc31f1db	51	#include "lwip/def.h"
donatien	0:b802fc31f1db	52	#include "lwip/ip.h"
donatien	0:b802fc31f1db	53	#include "lwip/stats.h"
donatien	0:b802fc31f1db	54	#include "lwip/snmp.h"
donatien	0:b802fc31f1db	55	#include "lwip/dhcp.h"
donatien	0:b802fc31f1db	56	#include "lwip/autoip.h"
donatien	0:b802fc31f1db	57	#include "netif/etharp.h"
donatien	0:b802fc31f1db	58
donatien	0:b802fc31f1db	59	#if PPPOE_SUPPORT
donatien	0:b802fc31f1db	60	#include "netif/ppp_oe.h"
donatien	0:b802fc31f1db	61	#endif /* PPPOE_SUPPORT */
donatien	0:b802fc31f1db	62
donatien	0:b802fc31f1db	63	#include <string.h>
donatien	0:b802fc31f1db	64
donatien	0:b802fc31f1db	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
donatien	0:b802fc31f1db	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
donatien	0:b802fc31f1db	67
donatien	0:b802fc31f1db	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
donatien	0:b802fc31f1db	69
donatien	0:b802fc31f1db	70	/** the time an ARP entry stays valid after its last update,
donatien	0:b802fc31f1db	71	* for ARP_TMR_INTERVAL = 5000, this is
donatien	0:b802fc31f1db	72	* (240 * 5) seconds = 20 minutes.
donatien	0:b802fc31f1db	73	*/
donatien	0:b802fc31f1db	74	#define ARP_MAXAGE 240
donatien	0:b802fc31f1db	75	/** the time an ARP entry stays pending after first request,
donatien	0:b802fc31f1db	76	* for ARP_TMR_INTERVAL = 5000, this is
donatien	0:b802fc31f1db	77	* (2 * 5) seconds = 10 seconds.
donatien	0:b802fc31f1db	78	*
donatien	0:b802fc31f1db	79	* @internal Keep this number at least 2, otherwise it might
donatien	0:b802fc31f1db	80	* run out instantly if the timeout occurs directly after a request.
donatien	0:b802fc31f1db	81	*/
donatien	0:b802fc31f1db	82	#define ARP_MAXPENDING 2
donatien	0:b802fc31f1db	83
donatien	0:b802fc31f1db	84	#define HWTYPE_ETHERNET 1
donatien	0:b802fc31f1db	85
donatien	0:b802fc31f1db	86	enum etharp_state {
donatien	0:b802fc31f1db	87	ETHARP_STATE_EMPTY = 0,
donatien	0:b802fc31f1db	88	ETHARP_STATE_PENDING,
donatien	0:b802fc31f1db	89	ETHARP_STATE_STABLE
donatien	0:b802fc31f1db	90	};
donatien	0:b802fc31f1db	91
donatien	0:b802fc31f1db	92	struct etharp_entry {
donatien	0:b802fc31f1db	93	#if ARP_QUEUEING
donatien	1:3a7c15057192	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
donatien	0:b802fc31f1db	95	struct etharp_q_entry *q;
donatien	0:b802fc31f1db	96	#endif /* ARP_QUEUEING */
donatien	0:b802fc31f1db	97	ip_addr_t ipaddr;
donatien	0:b802fc31f1db	98	struct eth_addr ethaddr;
donatien	1:3a7c15057192	99	#if LWIP_SNMP
donatien	1:3a7c15057192	100	struct netif *netif;
donatien	1:3a7c15057192	101	#endif /* LWIP_SNMP */
donatien	1:3a7c15057192	102	u8_t state;
donatien	0:b802fc31f1db	103	u8_t ctime;
donatien	1:3a7c15057192	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	105	u8_t static_entry;
donatien	1:3a7c15057192	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	0:b802fc31f1db	107	};
donatien	0:b802fc31f1db	108
donatien	0:b802fc31f1db	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
donatien	1:3a7c15057192	110
donatien	0:b802fc31f1db	111	#if !LWIP_NETIF_HWADDRHINT
donatien	0:b802fc31f1db	112	static u8_t etharp_cached_entry;
donatien	0:b802fc31f1db	113	#endif /* !LWIP_NETIF_HWADDRHINT */
donatien	0:b802fc31f1db	114
donatien	1:3a7c15057192	115	/** Try hard to create a new entry - we want the IP address to appear in
donatien	1:3a7c15057192	116	the cache (even if this means removing an active entry or so). */
donatien	1:3a7c15057192	117	#define ETHARP_FLAG_TRY_HARD 1
donatien	1:3a7c15057192	118	#define ETHARP_FLAG_FIND_ONLY 2
donatien	1:3a7c15057192	119	#define ETHARP_FLAG_STATIC_ENTRY 4
donatien	0:b802fc31f1db	120
donatien	0:b802fc31f1db	121	#if LWIP_NETIF_HWADDRHINT
donatien	1:3a7c15057192	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
donatien	0:b802fc31f1db	123	*((netif)->addr_hint) = (hint);
donatien	0:b802fc31f1db	124	#else /* LWIP_NETIF_HWADDRHINT */
donatien	1:3a7c15057192	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
donatien	0:b802fc31f1db	126	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:b802fc31f1db	127
donatien	0:b802fc31f1db	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
donatien	0:b802fc31f1db	129
donatien	0:b802fc31f1db	130
donatien	0:b802fc31f1db	131	/* Some checks, instead of etharp_init(): */
donatien	0:b802fc31f1db	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
donatien	1:3a7c15057192	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
donatien	0:b802fc31f1db	134	#endif
donatien	0:b802fc31f1db	135
donatien	0:b802fc31f1db	136
donatien	0:b802fc31f1db	137	#if ARP_QUEUEING
donatien	0:b802fc31f1db	138	/**
donatien	0:b802fc31f1db	139	* Free a complete queue of etharp entries
donatien	0:b802fc31f1db	140	*
donatien	0:b802fc31f1db	141	* @param q a qeueue of etharp_q_entry's to free
donatien	0:b802fc31f1db	142	*/
donatien	0:b802fc31f1db	143	static void
donatien	0:b802fc31f1db	144	free_etharp_q(struct etharp_q_entry *q)
donatien	0:b802fc31f1db	145	{
donatien	0:b802fc31f1db	146	struct etharp_q_entry *r;
donatien	0:b802fc31f1db	147	LWIP_ASSERT("q != NULL", q != NULL);
donatien	0:b802fc31f1db	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
donatien	0:b802fc31f1db	149	while (q) {
donatien	0:b802fc31f1db	150	r = q;
donatien	0:b802fc31f1db	151	q = q->next;
donatien	0:b802fc31f1db	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
donatien	0:b802fc31f1db	153	pbuf_free(r->p);
donatien	0:b802fc31f1db	154	memp_free(MEMP_ARP_QUEUE, r);
donatien	0:b802fc31f1db	155	}
donatien	0:b802fc31f1db	156	}
donatien	0:b802fc31f1db	157	#endif /* ARP_QUEUEING */
donatien	0:b802fc31f1db	158
donatien	1:3a7c15057192	159	/** Clean up ARP table entries */
donatien	1:3a7c15057192	160	static void
donatien	1:3a7c15057192	161	free_entry(int i)
donatien	1:3a7c15057192	162	{
donatien	1:3a7c15057192	163	/* remove from SNMP ARP index tree */
donatien	1:3a7c15057192	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
donatien	1:3a7c15057192	165	#if ARP_QUEUEING
donatien	1:3a7c15057192	166	/* and empty packet queue */
donatien	1:3a7c15057192	167	if (arp_table[i].q != NULL) {
donatien	1:3a7c15057192	168	/* remove all queued packets */
donatien	1:3a7c15057192	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
donatien	1:3a7c15057192	170	free_etharp_q(arp_table[i].q);
donatien	1:3a7c15057192	171	arp_table[i].q = NULL;
donatien	1:3a7c15057192	172	}
donatien	1:3a7c15057192	173	#endif /* ARP_QUEUEING */
donatien	1:3a7c15057192	174	/* recycle entry for re-use */
donatien	1:3a7c15057192	175	arp_table[i].state = ETHARP_STATE_EMPTY;
donatien	1:3a7c15057192	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	177	arp_table[i].static_entry = 0;
donatien	1:3a7c15057192	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	1:3a7c15057192	179	#ifdef LWIP_DEBUG
donatien	1:3a7c15057192	180	/* for debugging, clean out the complete entry */
donatien	1:3a7c15057192	181	arp_table[i].ctime = 0;
donatien	1:3a7c15057192	182	#if LWIP_SNMP
donatien	1:3a7c15057192	183	arp_table[i].netif = NULL;
donatien	1:3a7c15057192	184	#endif /* LWIP_SNMP */
donatien	1:3a7c15057192	185	ip_addr_set_zero(&arp_table[i].ipaddr);
donatien	1:3a7c15057192	186	arp_table[i].ethaddr = ethzero;
donatien	1:3a7c15057192	187	#endif /* LWIP_DEBUG */
donatien	1:3a7c15057192	188	}
donatien	1:3a7c15057192	189
donatien	0:b802fc31f1db	190	/**
donatien	0:b802fc31f1db	191	* Clears expired entries in the ARP table.
donatien	0:b802fc31f1db	192	*
donatien	1:3a7c15057192	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
donatien	0:b802fc31f1db	194	* in order to expire entries in the ARP table.
donatien	0:b802fc31f1db	195	*/
donatien	0:b802fc31f1db	196	void
donatien	0:b802fc31f1db	197	etharp_tmr(void)
donatien	0:b802fc31f1db	198	{
donatien	0:b802fc31f1db	199	u8_t i;
donatien	0:b802fc31f1db	200
donatien	0:b802fc31f1db	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
donatien	0:b802fc31f1db	202	/* remove expired entries from the ARP table */
donatien	0:b802fc31f1db	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
donatien	1:3a7c15057192	204	u8_t state = arp_table[i].state;
donatien	1:3a7c15057192	205	if (state != ETHARP_STATE_EMPTY
donatien	1:3a7c15057192	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	207	&& (arp_table[i].static_entry == 0)
donatien	1:3a7c15057192	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	1:3a7c15057192	209	) {
donatien	1:3a7c15057192	210	arp_table[i].ctime++;
donatien	1:3a7c15057192	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
donatien	1:3a7c15057192	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
donatien	1:3a7c15057192	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
donatien	1:3a7c15057192	214	/* pending or stable entry has become old! */
donatien	1:3a7c15057192	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
donatien	1:3a7c15057192	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
donatien	1:3a7c15057192	217	/* clean up entries that have just been expired */
donatien	1:3a7c15057192	218	free_entry(i);
donatien	1:3a7c15057192	219	}
donatien	0:b802fc31f1db	220	#if ARP_QUEUEING
donatien	1:3a7c15057192	221	/* still pending entry? (not expired) */
donatien	1:3a7c15057192	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	1:3a7c15057192	223	/* resend an ARP query here? */
donatien	0:b802fc31f1db	224	}
donatien	0:b802fc31f1db	225	#endif /* ARP_QUEUEING */
donatien	0:b802fc31f1db	226	}
donatien	0:b802fc31f1db	227	}
donatien	0:b802fc31f1db	228	}
donatien	0:b802fc31f1db	229
donatien	0:b802fc31f1db	230	/**
donatien	0:b802fc31f1db	231	* Search the ARP table for a matching or new entry.
donatien	0:b802fc31f1db	232	*
donatien	0:b802fc31f1db	233	* If an IP address is given, return a pending or stable ARP entry that matches
donatien	0:b802fc31f1db	234	* the address. If no match is found, create a new entry with this address set,
donatien	0:b802fc31f1db	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
donatien	0:b802fc31f1db	236	* state of the returned entry.
donatien	0:b802fc31f1db	237	*
donatien	0:b802fc31f1db	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
donatien	0:b802fc31f1db	239	*
donatien	0:b802fc31f1db	240	* In all cases, attempt to create new entries from an empty entry. If no
donatien	1:3a7c15057192	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
donatien	0:b802fc31f1db	242	* old entries. Heuristic choose the least important entry for recycling.
donatien	0:b802fc31f1db	243	*
donatien	0:b802fc31f1db	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
donatien	1:3a7c15057192	245	* @param flags @see definition of ETHARP_FLAG_*
donatien	1:3a7c15057192	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
donatien	0:b802fc31f1db	247	*
donatien	0:b802fc31f1db	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
donatien	0:b802fc31f1db	249	* entry is found or could be recycled.
donatien	0:b802fc31f1db	250	*/
donatien	0:b802fc31f1db	251	static s8_t
donatien	0:b802fc31f1db	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
donatien	0:b802fc31f1db	253	{
donatien	0:b802fc31f1db	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
donatien	0:b802fc31f1db	255	s8_t empty = ARP_TABLE_SIZE;
donatien	0:b802fc31f1db	256	u8_t i = 0, age_pending = 0, age_stable = 0;
donatien	0:b802fc31f1db	257	#if ARP_QUEUEING
donatien	0:b802fc31f1db	258	/* oldest entry with packets on queue */
donatien	0:b802fc31f1db	259	s8_t old_queue = ARP_TABLE_SIZE;
donatien	0:b802fc31f1db	260	/* its age */
donatien	0:b802fc31f1db	261	u8_t age_queue = 0;
donatien	0:b802fc31f1db	262	#endif /* ARP_QUEUEING */
donatien	0:b802fc31f1db	263
donatien	0:b802fc31f1db	264	/**
donatien	0:b802fc31f1db	265	* a) do a search through the cache, remember candidates
donatien	0:b802fc31f1db	266	* b) select candidate entry
donatien	0:b802fc31f1db	267	* c) create new entry
donatien	0:b802fc31f1db	268	*/
donatien	0:b802fc31f1db	269
donatien	0:b802fc31f1db	270	/* a) in a single search sweep, do all of this
donatien	0:b802fc31f1db	271	* 1) remember the first empty entry (if any)
donatien	0:b802fc31f1db	272	* 2) remember the oldest stable entry (if any)
donatien	0:b802fc31f1db	273	* 3) remember the oldest pending entry without queued packets (if any)
donatien	0:b802fc31f1db	274	* 4) remember the oldest pending entry with queued packets (if any)
donatien	0:b802fc31f1db	275	* 5) search for a matching IP entry, either pending or stable
donatien	0:b802fc31f1db	276	* until 5 matches, or all entries are searched for.
donatien	0:b802fc31f1db	277	*/
donatien	0:b802fc31f1db	278
donatien	0:b802fc31f1db	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
donatien	1:3a7c15057192	280	u8_t state = arp_table[i].state;
donatien	0:b802fc31f1db	281	/* no empty entry found yet and now we do find one? */
donatien	1:3a7c15057192	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
donatien	0:b802fc31f1db	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
donatien	0:b802fc31f1db	284	/* remember first empty entry */
donatien	0:b802fc31f1db	285	empty = i;
donatien	1:3a7c15057192	286	} else if (state != ETHARP_STATE_EMPTY) {
donatien	1:3a7c15057192	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
donatien	1:3a7c15057192	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
donatien	0:b802fc31f1db	289	/* if given, does IP address match IP address in ARP entry? */
donatien	0:b802fc31f1db	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
donatien	1:3a7c15057192	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
donatien	0:b802fc31f1db	292	/* found exact IP address match, simply bail out */
donatien	0:b802fc31f1db	293	return i;
donatien	1:3a7c15057192	294	}
donatien	1:3a7c15057192	295	/* pending entry? */
donatien	1:3a7c15057192	296	if (state == ETHARP_STATE_PENDING) {
donatien	1:3a7c15057192	297	/* pending with queued packets? */
donatien	0:b802fc31f1db	298	#if ARP_QUEUEING
donatien	1:3a7c15057192	299	if (arp_table[i].q != NULL) {
donatien	1:3a7c15057192	300	if (arp_table[i].ctime >= age_queue) {
donatien	1:3a7c15057192	301	old_queue = i;
donatien	1:3a7c15057192	302	age_queue = arp_table[i].ctime;
donatien	1:3a7c15057192	303	}
donatien	1:3a7c15057192	304	} else
donatien	0:b802fc31f1db	305	#endif /* ARP_QUEUEING */
donatien	1:3a7c15057192	306	/* pending without queued packets? */
donatien	1:3a7c15057192	307	{
donatien	1:3a7c15057192	308	if (arp_table[i].ctime >= age_pending) {
donatien	1:3a7c15057192	309	old_pending = i;
donatien	1:3a7c15057192	310	age_pending = arp_table[i].ctime;
donatien	1:3a7c15057192	311	}
donatien	0:b802fc31f1db	312	}
donatien	1:3a7c15057192	313	/* stable entry? */
donatien	1:3a7c15057192	314	} else if (state == ETHARP_STATE_STABLE) {
donatien	1:3a7c15057192	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	316	/* don't record old_stable for static entries since they never expire */
donatien	1:3a7c15057192	317	if (arp_table[i].static_entry == 0)
donatien	1:3a7c15057192	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	1:3a7c15057192	319	{
donatien	1:3a7c15057192	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
donatien	1:3a7c15057192	321	if (arp_table[i].ctime >= age_stable) {
donatien	1:3a7c15057192	322	old_stable = i;
donatien	1:3a7c15057192	323	age_stable = arp_table[i].ctime;
donatien	1:3a7c15057192	324	}
donatien	1:3a7c15057192	325	}
donatien	0:b802fc31f1db	326	}
donatien	0:b802fc31f1db	327	}
donatien	0:b802fc31f1db	328	}
donatien	0:b802fc31f1db	329	/* { we have no match } => try to create a new entry */
donatien	0:b802fc31f1db	330
donatien	0:b802fc31f1db	331	/* don't create new entry, only search? */
donatien	1:3a7c15057192	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
donatien	0:b802fc31f1db	333	/* or no empty entry found and not allowed to recycle? */
donatien	1:3a7c15057192	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
donatien	0:b802fc31f1db	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
donatien	0:b802fc31f1db	336	return (s8_t)ERR_MEM;
donatien	0:b802fc31f1db	337	}
donatien	0:b802fc31f1db	338
donatien	0:b802fc31f1db	339	/* b) choose the least destructive entry to recycle:
donatien	0:b802fc31f1db	340	* 1) empty entry
donatien	0:b802fc31f1db	341	* 2) oldest stable entry
donatien	0:b802fc31f1db	342	* 3) oldest pending entry without queued packets
donatien	0:b802fc31f1db	343	* 4) oldest pending entry with queued packets
donatien	0:b802fc31f1db	344	*
donatien	1:3a7c15057192	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
donatien	0:b802fc31f1db	346	*/
donatien	0:b802fc31f1db	347
donatien	0:b802fc31f1db	348	/* 1) empty entry available? */
donatien	0:b802fc31f1db	349	if (empty < ARP_TABLE_SIZE) {
donatien	0:b802fc31f1db	350	i = empty;
donatien	0:b802fc31f1db	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
donatien	1:3a7c15057192	352	} else {
donatien	1:3a7c15057192	353	/* 2) found recyclable stable entry? */
donatien	1:3a7c15057192	354	if (old_stable < ARP_TABLE_SIZE) {
donatien	1:3a7c15057192	355	/* recycle oldest stable*/
donatien	1:3a7c15057192	356	i = old_stable;
donatien	1:3a7c15057192	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
donatien	0:b802fc31f1db	358	#if ARP_QUEUEING
donatien	1:3a7c15057192	359	/* no queued packets should exist on stable entries */
donatien	1:3a7c15057192	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
donatien	0:b802fc31f1db	361	#endif /* ARP_QUEUEING */
donatien	1:3a7c15057192	362	/* 3) found recyclable pending entry without queued packets? */
donatien	1:3a7c15057192	363	} else if (old_pending < ARP_TABLE_SIZE) {
donatien	1:3a7c15057192	364	/* recycle oldest pending */
donatien	1:3a7c15057192	365	i = old_pending;
donatien	1:3a7c15057192	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
donatien	0:b802fc31f1db	367	#if ARP_QUEUEING
donatien	1:3a7c15057192	368	/* 4) found recyclable pending entry with queued packets? */
donatien	1:3a7c15057192	369	} else if (old_queue < ARP_TABLE_SIZE) {
donatien	1:3a7c15057192	370	/* recycle oldest pending (queued packets are free in free_entry) */
donatien	1:3a7c15057192	371	i = old_queue;
donatien	1:3a7c15057192	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)));
donatien	0:b802fc31f1db	373	#endif /* ARP_QUEUEING */
donatien	1:3a7c15057192	374	/* no empty or recyclable entries found */
donatien	1:3a7c15057192	375	} else {
donatien	1:3a7c15057192	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
donatien	1:3a7c15057192	377	return (s8_t)ERR_MEM;
donatien	1:3a7c15057192	378	}
donatien	1:3a7c15057192	379
donatien	1:3a7c15057192	380	/* { empty or recyclable entry found } */
donatien	1:3a7c15057192	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
donatien	1:3a7c15057192	382	free_entry(i);
donatien	0:b802fc31f1db	383	}
donatien	0:b802fc31f1db	384
donatien	0:b802fc31f1db	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
donatien	1:3a7c15057192	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
donatien	1:3a7c15057192	387	arp_table[i].state == ETHARP_STATE_EMPTY);
donatien	0:b802fc31f1db	388
donatien	0:b802fc31f1db	389	/* IP address given? */
donatien	0:b802fc31f1db	390	if (ipaddr != NULL) {
donatien	0:b802fc31f1db	391	/* set IP address */
donatien	0:b802fc31f1db	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
donatien	0:b802fc31f1db	393	}
donatien	0:b802fc31f1db	394	arp_table[i].ctime = 0;
donatien	1:3a7c15057192	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	396	arp_table[i].static_entry = 0;
donatien	1:3a7c15057192	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	0:b802fc31f1db	398	return (err_t)i;
donatien	0:b802fc31f1db	399	}
donatien	0:b802fc31f1db	400
donatien	0:b802fc31f1db	401	/**
donatien	0:b802fc31f1db	402	* Send an IP packet on the network using netif->linkoutput
donatien	0:b802fc31f1db	403	* The ethernet header is filled in before sending.
donatien	0:b802fc31f1db	404	*
donatien	0:b802fc31f1db	405	* @params netif the lwIP network interface on which to send the packet
donatien	0:b802fc31f1db	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
donatien	0:b802fc31f1db	407	* @params src the source MAC address to be copied into the ethernet header
donatien	0:b802fc31f1db	408	* @params dst the destination MAC address to be copied into the ethernet header
donatien	0:b802fc31f1db	409	* @return ERR_OK if the packet was sent, any other err_t on failure
donatien	0:b802fc31f1db	410	*/
donatien	0:b802fc31f1db	411	static err_t
donatien	0:b802fc31f1db	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
donatien	0:b802fc31f1db	413	{
donatien	0:b802fc31f1db	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
donatien	0:b802fc31f1db	415
donatien	0:b802fc31f1db	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:b802fc31f1db	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	1:3a7c15057192	418	ETHADDR32_COPY(&ethhdr->dest, dst);
donatien	1:3a7c15057192	419	ETHADDR16_COPY(&ethhdr->src, src);
donatien	1:3a7c15057192	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
donatien	0:b802fc31f1db	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
donatien	0:b802fc31f1db	422	/* send the packet */
donatien	0:b802fc31f1db	423	return netif->linkoutput(netif, p);
donatien	0:b802fc31f1db	424	}
donatien	0:b802fc31f1db	425
donatien	0:b802fc31f1db	426	/**
donatien	0:b802fc31f1db	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
donatien	0:b802fc31f1db	428	*
donatien	0:b802fc31f1db	429	* If a pending entry is resolved, any queued packets will be sent
donatien	0:b802fc31f1db	430	* at this point.
donatien	0:b802fc31f1db	431	*
donatien	1:3a7c15057192	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
donatien	0:b802fc31f1db	433	* @param ipaddr IP address of the inserted ARP entry.
donatien	0:b802fc31f1db	434	* @param ethaddr Ethernet address of the inserted ARP entry.
donatien	1:3a7c15057192	435	* @param flags @see definition of ETHARP_FLAG_*
donatien	0:b802fc31f1db	436	*
donatien	0:b802fc31f1db	437	* @return
donatien	0:b802fc31f1db	438	* - ERR_OK Succesfully updated ARP cache.
donatien	1:3a7c15057192	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
donatien	0:b802fc31f1db	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
donatien	0:b802fc31f1db	441	*
donatien	0:b802fc31f1db	442	* @see pbuf_free()
donatien	0:b802fc31f1db	443	*/
donatien	0:b802fc31f1db	444	static err_t
donatien	0:b802fc31f1db	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
donatien	0:b802fc31f1db	446	{
donatien	0:b802fc31f1db	447	s8_t i;
donatien	0:b802fc31f1db	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
donatien	0:b802fc31f1db	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",
donatien	0:b802fc31f1db	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
donatien	0:b802fc31f1db	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
donatien	0:b802fc31f1db	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
donatien	0:b802fc31f1db	453	/* non-unicast address? */
donatien	0:b802fc31f1db	454	if (ip_addr_isany(ipaddr) \|\|
donatien	0:b802fc31f1db	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
donatien	0:b802fc31f1db	456	ip_addr_ismulticast(ipaddr)) {
donatien	0:b802fc31f1db	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
donatien	0:b802fc31f1db	458	return ERR_ARG;
donatien	0:b802fc31f1db	459	}
donatien	0:b802fc31f1db	460	/* find or create ARP entry */
donatien	0:b802fc31f1db	461	i = find_entry(ipaddr, flags);
donatien	0:b802fc31f1db	462	/* bail out if no entry could be found */
donatien	1:3a7c15057192	463	if (i < 0) {
donatien	0:b802fc31f1db	464	return (err_t)i;
donatien	1:3a7c15057192	465	}
donatien	1:3a7c15057192	466
donatien	1:3a7c15057192	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
donatien	1:3a7c15057192	469	/* record static type */
donatien	1:3a7c15057192	470	arp_table[i].static_entry = 1;
donatien	1:3a7c15057192	471	}
donatien	1:3a7c15057192	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	1:3a7c15057192	473
donatien	0:b802fc31f1db	474	/* mark it stable */
donatien	0:b802fc31f1db	475	arp_table[i].state = ETHARP_STATE_STABLE;
donatien	1:3a7c15057192	476
donatien	1:3a7c15057192	477	#if LWIP_SNMP
donatien	0:b802fc31f1db	478	/* record network interface */
donatien	0:b802fc31f1db	479	arp_table[i].netif = netif;
donatien	1:3a7c15057192	480	#endif /* LWIP_SNMP */
donatien	0:b802fc31f1db	481	/* insert in SNMP ARP index tree */
donatien	0:b802fc31f1db	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
donatien	0:b802fc31f1db	483
donatien	0:b802fc31f1db	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
donatien	0:b802fc31f1db	485	/* update address */
donatien	1:3a7c15057192	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
donatien	0:b802fc31f1db	487	/* reset time stamp */
donatien	0:b802fc31f1db	488	arp_table[i].ctime = 0;
donatien	0:b802fc31f1db	489	#if ARP_QUEUEING
donatien	0:b802fc31f1db	490	/* this is where we will send out queued packets! */
donatien	0:b802fc31f1db	491	while (arp_table[i].q != NULL) {
donatien	0:b802fc31f1db	492	struct pbuf *p;
donatien	0:b802fc31f1db	493	/* remember remainder of queue */
donatien	0:b802fc31f1db	494	struct etharp_q_entry *q = arp_table[i].q;
donatien	0:b802fc31f1db	495	/* pop first item off the queue */
donatien	0:b802fc31f1db	496	arp_table[i].q = q->next;
donatien	0:b802fc31f1db	497	/* get the packet pointer */
donatien	0:b802fc31f1db	498	p = q->p;
donatien	0:b802fc31f1db	499	/* now queue entry can be freed */
donatien	0:b802fc31f1db	500	memp_free(MEMP_ARP_QUEUE, q);
donatien	0:b802fc31f1db	501	/* send the queued IP packet */
donatien	0:b802fc31f1db	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
donatien	0:b802fc31f1db	503	/* free the queued IP packet */
donatien	0:b802fc31f1db	504	pbuf_free(p);
donatien	0:b802fc31f1db	505	}
donatien	0:b802fc31f1db	506	#endif /* ARP_QUEUEING */
donatien	0:b802fc31f1db	507	return ERR_OK;
donatien	0:b802fc31f1db	508	}
donatien	0:b802fc31f1db	509
donatien	1:3a7c15057192	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	1:3a7c15057192	511	/** Add a new static entry to the ARP table. If an entry exists for the
donatien	1:3a7c15057192	512	* specified IP address, this entry is overwritten.
donatien	1:3a7c15057192	513	* If packets are queued for the specified IP address, they are sent out.
donatien	1:3a7c15057192	514	*
donatien	1:3a7c15057192	515	* @param ipaddr IP address for the new static entry
donatien	1:3a7c15057192	516	* @param ethaddr ethernet address for the new static entry
donatien	1:3a7c15057192	517	* @return @see return values of etharp_add_static_entry
donatien	1:3a7c15057192	518	*/
donatien	1:3a7c15057192	519	err_t
donatien	1:3a7c15057192	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
donatien	1:3a7c15057192	521	{
donatien	1:3a7c15057192	522	struct netif *netif;
donatien	1:3a7c15057192	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",
donatien	1:3a7c15057192	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
donatien	1:3a7c15057192	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
donatien	1:3a7c15057192	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
donatien	1:3a7c15057192	527
donatien	1:3a7c15057192	528	netif = ip_route(ipaddr);
donatien	1:3a7c15057192	529	if (netif == NULL) {
donatien	1:3a7c15057192	530	return ERR_RTE;
donatien	1:3a7c15057192	531	}
donatien	1:3a7c15057192	532
donatien	1:3a7c15057192	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
donatien	1:3a7c15057192	534	}
donatien	1:3a7c15057192	535
donatien	1:3a7c15057192	536	/** Remove a static entry from the ARP table previously added with a call to
donatien	1:3a7c15057192	537	* etharp_add_static_entry.
donatien	1:3a7c15057192	538	*
donatien	1:3a7c15057192	539	* @param ipaddr IP address of the static entry to remove
donatien	1:3a7c15057192	540	* @return ERR_OK: entry removed
donatien	1:3a7c15057192	541	* ERR_MEM: entry wasn't found
donatien	1:3a7c15057192	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
donatien	1:3a7c15057192	543	*/
donatien	1:3a7c15057192	544	err_t
donatien	1:3a7c15057192	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
donatien	1:3a7c15057192	546	{
donatien	1:3a7c15057192	547	s8_t i;
donatien	1:3a7c15057192	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
donatien	1:3a7c15057192	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
donatien	1:3a7c15057192	550
donatien	1:3a7c15057192	551	/* find or create ARP entry */
donatien	1:3a7c15057192	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
donatien	1:3a7c15057192	553	/* bail out if no entry could be found */
donatien	1:3a7c15057192	554	if (i < 0) {
donatien	1:3a7c15057192	555	return (err_t)i;
donatien	1:3a7c15057192	556	}
donatien	1:3a7c15057192	557
donatien	1:3a7c15057192	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
donatien	1:3a7c15057192	559	(arp_table[i].static_entry == 0)) {
donatien	1:3a7c15057192	560	/* entry wasn't a static entry, cannot remove it */
donatien	1:3a7c15057192	561	return ERR_ARG;
donatien	1:3a7c15057192	562	}
donatien	1:3a7c15057192	563	/* entry found, free it */
donatien	1:3a7c15057192	564	free_entry(i);
donatien	1:3a7c15057192	565	return ERR_OK;
donatien	1:3a7c15057192	566	}
donatien	1:3a7c15057192	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	1:3a7c15057192	568
donatien	0:b802fc31f1db	569	/**
donatien	0:b802fc31f1db	570	* Finds (stable) ethernet/IP address pair from ARP table
donatien	0:b802fc31f1db	571	* using interface and IP address index.
donatien	0:b802fc31f1db	572	* @note the addresses in the ARP table are in network order!
donatien	0:b802fc31f1db	573	*
donatien	0:b802fc31f1db	574	* @param netif points to interface index
donatien	0:b802fc31f1db	575	* @param ipaddr points to the (network order) IP address index
donatien	0:b802fc31f1db	576	* @param eth_ret points to return pointer
donatien	0:b802fc31f1db	577	* @param ip_ret points to return pointer
donatien	0:b802fc31f1db	578	* @return table index if found, -1 otherwise
donatien	0:b802fc31f1db	579	*/
donatien	0:b802fc31f1db	580	s8_t
donatien	0:b802fc31f1db	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
donatien	0:b802fc31f1db	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
donatien	0:b802fc31f1db	583	{
donatien	0:b802fc31f1db	584	s8_t i;
donatien	0:b802fc31f1db	585
donatien	1:3a7c15057192	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
donatien	1:3a7c15057192	587	eth_ret != NULL && ip_ret != NULL);
donatien	1:3a7c15057192	588
donatien	0:b802fc31f1db	589	LWIP_UNUSED_ARG(netif);
donatien	0:b802fc31f1db	590
donatien	1:3a7c15057192	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
donatien	0:b802fc31f1db	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	0:b802fc31f1db	593	*eth_ret = &arp_table[i].ethaddr;
donatien	0:b802fc31f1db	594	*ip_ret = &arp_table[i].ipaddr;
donatien	0:b802fc31f1db	595	return i;
donatien	0:b802fc31f1db	596	}
donatien	0:b802fc31f1db	597	return -1;
donatien	0:b802fc31f1db	598	}
donatien	1:3a7c15057192	599
donatien	0:b802fc31f1db	600	#if ETHARP_TRUST_IP_MAC
donatien	0:b802fc31f1db	601	/**
donatien	0:b802fc31f1db	602	* Updates the ARP table using the given IP packet.
donatien	0:b802fc31f1db	603	*
donatien	0:b802fc31f1db	604	* Uses the incoming IP packet's source address to update the
donatien	0:b802fc31f1db	605	* ARP cache for the local network. The function does not alter
donatien	0:b802fc31f1db	606	* or free the packet. This function must be called before the
donatien	0:b802fc31f1db	607	* packet p is passed to the IP layer.
donatien	0:b802fc31f1db	608	*
donatien	0:b802fc31f1db	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
donatien	0:b802fc31f1db	610	* @param p The IP packet that arrived on netif.
donatien	0:b802fc31f1db	611	*
donatien	0:b802fc31f1db	612	* @return NULL
donatien	0:b802fc31f1db	613	*
donatien	0:b802fc31f1db	614	* @see pbuf_free()
donatien	0:b802fc31f1db	615	*/
donatien	0:b802fc31f1db	616	static void
donatien	0:b802fc31f1db	617	etharp_ip_input(struct netif netif, struct pbuf p)
donatien	0:b802fc31f1db	618	{
donatien	0:b802fc31f1db	619	struct eth_hdr *ethhdr;
donatien	0:b802fc31f1db	620	struct ip_hdr *iphdr;
donatien	1:3a7c15057192	621	ip_addr_t iphdr_src;
donatien	0:b802fc31f1db	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:b802fc31f1db	623
donatien	0:b802fc31f1db	624	/* Only insert an entry if the source IP address of the
donatien	0:b802fc31f1db	625	incoming IP packet comes from a host on the local network. */
donatien	0:b802fc31f1db	626	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:b802fc31f1db	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:b802fc31f1db	628	#if ETHARP_SUPPORT_VLAN
donatien	0:b802fc31f1db	629	if (ethhdr->type == ETHTYPE_VLAN) {
donatien	0:b802fc31f1db	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
donatien	0:b802fc31f1db	631	}
donatien	0:b802fc31f1db	632	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:b802fc31f1db	633
donatien	1:3a7c15057192	634	ip_addr_copy(iphdr_src, iphdr->src);
donatien	1:3a7c15057192	635
donatien	0:b802fc31f1db	636	/* source is not on the local network? */
donatien	1:3a7c15057192	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
donatien	0:b802fc31f1db	638	/* do nothing */
donatien	0:b802fc31f1db	639	return;
donatien	0:b802fc31f1db	640	}
donatien	0:b802fc31f1db	641
donatien	0:b802fc31f1db	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
donatien	0:b802fc31f1db	643	/* update the source IP address in the cache, if present */
donatien	1:3a7c15057192	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
donatien	0:b802fc31f1db	645	* back soon (for example, if the destination IP address is ours. */
donatien	1:3a7c15057192	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
donatien	0:b802fc31f1db	647	}
donatien	0:b802fc31f1db	648	#endif /* ETHARP_TRUST_IP_MAC */
donatien	0:b802fc31f1db	649
donatien	0:b802fc31f1db	650	/**
donatien	0:b802fc31f1db	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
donatien	0:b802fc31f1db	652	* send out queued IP packets. Updates cache with snooped address pairs.
donatien	0:b802fc31f1db	653	*
donatien	0:b802fc31f1db	654	* Should be called for incoming ARP packets. The pbuf in the argument
donatien	0:b802fc31f1db	655	* is freed by this function.
donatien	0:b802fc31f1db	656	*
donatien	0:b802fc31f1db	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
donatien	0:b802fc31f1db	658	* @param ethaddr Ethernet address of netif.
donatien	0:b802fc31f1db	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
donatien	0:b802fc31f1db	660	*
donatien	0:b802fc31f1db	661	* @return NULL
donatien	0:b802fc31f1db	662	*
donatien	0:b802fc31f1db	663	* @see pbuf_free()
donatien	0:b802fc31f1db	664	*/
donatien	0:b802fc31f1db	665	static void
donatien	0:b802fc31f1db	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
donatien	0:b802fc31f1db	667	{
donatien	0:b802fc31f1db	668	struct etharp_hdr *hdr;
donatien	0:b802fc31f1db	669	struct eth_hdr *ethhdr;
donatien	0:b802fc31f1db	670	/* these are aligned properly, whereas the ARP header fields might not be */
donatien	0:b802fc31f1db	671	ip_addr_t sipaddr, dipaddr;
donatien	0:b802fc31f1db	672	u8_t for_us;
donatien	0:b802fc31f1db	673	#if LWIP_AUTOIP
donatien	0:b802fc31f1db	674	const u8_t * ethdst_hwaddr;
donatien	0:b802fc31f1db	675	#endif /* LWIP_AUTOIP */
donatien	0:b802fc31f1db	676
donatien	0:b802fc31f1db	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:b802fc31f1db	678
donatien	0:b802fc31f1db	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
donatien	0:b802fc31f1db	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
donatien	0:b802fc31f1db	681	if (p->len < SIZEOF_ETHARP_PACKET) {
donatien	0:b802fc31f1db	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:b802fc31f1db	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
donatien	0:b802fc31f1db	684	(s16_t)SIZEOF_ETHARP_PACKET));
donatien	0:b802fc31f1db	685	ETHARP_STATS_INC(etharp.lenerr);
donatien	0:b802fc31f1db	686	ETHARP_STATS_INC(etharp.drop);
donatien	0:b802fc31f1db	687	pbuf_free(p);
donatien	0:b802fc31f1db	688	return;
donatien	0:b802fc31f1db	689	}
donatien	0:b802fc31f1db	690
donatien	0:b802fc31f1db	691	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:b802fc31f1db	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:b802fc31f1db	693	#if ETHARP_SUPPORT_VLAN
donatien	0:b802fc31f1db	694	if (ethhdr->type == ETHTYPE_VLAN) {
donatien	0:b802fc31f1db	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
donatien	0:b802fc31f1db	696	}
donatien	0:b802fc31f1db	697	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:b802fc31f1db	698
donatien	0:b802fc31f1db	699	/* RFC 826 "Packet Reception": */
donatien	1:3a7c15057192	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
donatien	1:3a7c15057192	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
donatien	1:3a7c15057192	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
donatien	1:3a7c15057192	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
donatien	1:3a7c15057192	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
donatien	0:b802fc31f1db	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:b802fc31f1db	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",
donatien	1:3a7c15057192	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
donatien	0:b802fc31f1db	708	ETHARP_STATS_INC(etharp.proterr);
donatien	0:b802fc31f1db	709	ETHARP_STATS_INC(etharp.drop);
donatien	0:b802fc31f1db	710	pbuf_free(p);
donatien	0:b802fc31f1db	711	return;
donatien	0:b802fc31f1db	712	}
donatien	0:b802fc31f1db	713	ETHARP_STATS_INC(etharp.recv);
donatien	0:b802fc31f1db	714
donatien	0:b802fc31f1db	715	#if LWIP_AUTOIP
donatien	0:b802fc31f1db	716	/* We have to check if a host already has configured our random
donatien	0:b802fc31f1db	717	* created link local address and continously check if there is
donatien	0:b802fc31f1db	718	* a host with this IP-address so we can detect collisions */
donatien	0:b802fc31f1db	719	autoip_arp_reply(netif, hdr);
donatien	0:b802fc31f1db	720	#endif /* LWIP_AUTOIP */
donatien	0:b802fc31f1db	721
donatien	0:b802fc31f1db	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
donatien	0:b802fc31f1db	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
donatien	1:3a7c15057192	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
donatien	1:3a7c15057192	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
donatien	0:b802fc31f1db	726
donatien	0:b802fc31f1db	727	/* this interface is not configured? */
donatien	0:b802fc31f1db	728	if (ip_addr_isany(&netif->ip_addr)) {
donatien	0:b802fc31f1db	729	for_us = 0;
donatien	0:b802fc31f1db	730	} else {
donatien	0:b802fc31f1db	731	/* ARP packet directed to us? */
donatien	0:b802fc31f1db	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
donatien	0:b802fc31f1db	733	}
donatien	0:b802fc31f1db	734
donatien	1:3a7c15057192	735	/* ARP message directed to us?
donatien	1:3a7c15057192	736	-> add IP address in ARP cache; assume requester wants to talk to us,
donatien	1:3a7c15057192	737	can result in directly sending the queued packets for this host.
donatien	1:3a7c15057192	738	ARP message not directed to us?
donatien	1:3a7c15057192	739	-> update the source IP address in the cache, if present */
donatien	1:3a7c15057192	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
donatien	1:3a7c15057192	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
donatien	0:b802fc31f1db	742
donatien	0:b802fc31f1db	743	/* now act on the message itself */
donatien	1:3a7c15057192	744	switch (hdr->opcode) {
donatien	0:b802fc31f1db	745	/* ARP request? */
donatien	1:3a7c15057192	746	case PP_HTONS(ARP_REQUEST):
donatien	0:b802fc31f1db	747	/* ARP request. If it asked for our address, we send out a
donatien	0:b802fc31f1db	748	* reply. In any case, we time-stamp any existing ARP entry,
donatien	0:b802fc31f1db	749	* and possiby send out an IP packet that was queued on it. */
donatien	0:b802fc31f1db	750
donatien	0:b802fc31f1db	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
donatien	0:b802fc31f1db	752	/* ARP request for our address? */
donatien	0:b802fc31f1db	753	if (for_us) {
donatien	0:b802fc31f1db	754
donatien	0:b802fc31f1db	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
donatien	0:b802fc31f1db	756	/* Re-use pbuf to send ARP reply.
donatien	0:b802fc31f1db	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
donatien	0:b802fc31f1db	758	that would allocate a new pbuf. */
donatien	0:b802fc31f1db	759	hdr->opcode = htons(ARP_REPLY);
donatien	0:b802fc31f1db	760
donatien	1:3a7c15057192	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
donatien	1:3a7c15057192	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
donatien	0:b802fc31f1db	763
donatien	0:b802fc31f1db	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:b802fc31f1db	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:b802fc31f1db	766	#if LWIP_AUTOIP
donatien	0:b802fc31f1db	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
donatien	0:b802fc31f1db	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
donatien	0:b802fc31f1db	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
donatien	0:b802fc31f1db	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
donatien	0:b802fc31f1db	771	#endif /* LWIP_AUTOIP */
donatien	0:b802fc31f1db	772
donatien	1:3a7c15057192	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
donatien	0:b802fc31f1db	774	#if LWIP_AUTOIP
donatien	1:3a7c15057192	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
donatien	0:b802fc31f1db	776	#else /* LWIP_AUTOIP */
donatien	1:3a7c15057192	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
donatien	0:b802fc31f1db	778	#endif /* LWIP_AUTOIP */
donatien	1:3a7c15057192	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
donatien	1:3a7c15057192	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
donatien	0:b802fc31f1db	781
donatien	0:b802fc31f1db	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
donatien	0:b802fc31f1db	783	are already correct, we tested that before */
donatien	0:b802fc31f1db	784
donatien	0:b802fc31f1db	785	/* return ARP reply */
donatien	0:b802fc31f1db	786	netif->linkoutput(netif, p);
donatien	0:b802fc31f1db	787	/* we are not configured? */
donatien	0:b802fc31f1db	788	} else if (ip_addr_isany(&netif->ip_addr)) {
donatien	0:b802fc31f1db	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
donatien	0:b802fc31f1db	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
donatien	0:b802fc31f1db	791	/* request was not directed to us */
donatien	0:b802fc31f1db	792	} else {
donatien	0:b802fc31f1db	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
donatien	0:b802fc31f1db	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
donatien	0:b802fc31f1db	795	}
donatien	0:b802fc31f1db	796	break;
donatien	1:3a7c15057192	797	case PP_HTONS(ARP_REPLY):
donatien	0:b802fc31f1db	798	/* ARP reply. We already updated the ARP cache earlier. */
donatien	0:b802fc31f1db	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
donatien	0:b802fc31f1db	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
donatien	0:b802fc31f1db	801	/* DHCP wants to know about ARP replies from any host with an
donatien	0:b802fc31f1db	802	* IP address also offered to us by the DHCP server. We do not
donatien	0:b802fc31f1db	803	* want to take a duplicate IP address on a single network.
donatien	0:b802fc31f1db	804	* @todo How should we handle redundant (fail-over) interfaces? */
donatien	0:b802fc31f1db	805	dhcp_arp_reply(netif, &sipaddr);
donatien	0:b802fc31f1db	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
donatien	0:b802fc31f1db	807	break;
donatien	0:b802fc31f1db	808	default:
donatien	0:b802fc31f1db	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
donatien	0:b802fc31f1db	810	ETHARP_STATS_INC(etharp.err);
donatien	0:b802fc31f1db	811	break;
donatien	0:b802fc31f1db	812	}
donatien	0:b802fc31f1db	813	/* free ARP packet */
donatien	0:b802fc31f1db	814	pbuf_free(p);
donatien	0:b802fc31f1db	815	}
donatien	0:b802fc31f1db	816
donatien	0:b802fc31f1db	817	/**
donatien	0:b802fc31f1db	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
donatien	0:b802fc31f1db	819	*
donatien	0:b802fc31f1db	820	* For IP multicast and broadcast, corresponding Ethernet addresses
donatien	0:b802fc31f1db	821	* are selected and the packet is transmitted on the link.
donatien	0:b802fc31f1db	822	*
donatien	0:b802fc31f1db	823	* For unicast addresses, the packet is submitted to etharp_query(). In
donatien	0:b802fc31f1db	824	* case the IP address is outside the local network, the IP address of
donatien	0:b802fc31f1db	825	* the gateway is used.
donatien	0:b802fc31f1db	826	*
donatien	0:b802fc31f1db	827	* @param netif The lwIP network interface which the IP packet will be sent on.
donatien	0:b802fc31f1db	828	* @param q The pbuf(s) containing the IP packet to be sent.
donatien	0:b802fc31f1db	829	* @param ipaddr The IP address of the packet destination.
donatien	0:b802fc31f1db	830	*
donatien	0:b802fc31f1db	831	* @return
donatien	0:b802fc31f1db	832	* - ERR_RTE No route to destination (no gateway to external networks),
donatien	0:b802fc31f1db	833	* or the return type of either etharp_query() or etharp_send_ip().
donatien	0:b802fc31f1db	834	*/
donatien	0:b802fc31f1db	835	err_t
donatien	0:b802fc31f1db	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
donatien	0:b802fc31f1db	837	{
donatien	0:b802fc31f1db	838	struct eth_addr *dest, mcastaddr;
donatien	0:b802fc31f1db	839
donatien	0:b802fc31f1db	840	/* make room for Ethernet header - should not fail */
donatien	0:b802fc31f1db	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
donatien	0:b802fc31f1db	842	/* bail out */
donatien	0:b802fc31f1db	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	844	("etharp_output: could not allocate room for header.\n"));
donatien	0:b802fc31f1db	845	LINK_STATS_INC(link.lenerr);
donatien	0:b802fc31f1db	846	return ERR_BUF;
donatien	0:b802fc31f1db	847	}
donatien	0:b802fc31f1db	848
donatien	0:b802fc31f1db	849	/* assume unresolved Ethernet address */
donatien	0:b802fc31f1db	850	dest = NULL;
donatien	0:b802fc31f1db	851	/* Determine on destination hardware address. Broadcasts and multicasts
donatien	0:b802fc31f1db	852	* are special, other IP addresses are looked up in the ARP table. */
donatien	0:b802fc31f1db	853
donatien	0:b802fc31f1db	854	/* broadcast destination IP address? */
donatien	0:b802fc31f1db	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
donatien	0:b802fc31f1db	856	/* broadcast on Ethernet also */
donatien	0:b802fc31f1db	857	dest = (struct eth_addr *)&ethbroadcast;
donatien	0:b802fc31f1db	858	/* multicast destination IP address? */
donatien	0:b802fc31f1db	859	} else if (ip_addr_ismulticast(ipaddr)) {
donatien	0:b802fc31f1db	860	/* Hash IP multicast address to MAC address.*/
donatien	0:b802fc31f1db	861	mcastaddr.addr[0] = 0x01;
donatien	0:b802fc31f1db	862	mcastaddr.addr[1] = 0x00;
donatien	0:b802fc31f1db	863	mcastaddr.addr[2] = 0x5e;
donatien	0:b802fc31f1db	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
donatien	0:b802fc31f1db	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
donatien	0:b802fc31f1db	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
donatien	0:b802fc31f1db	867	/* destination Ethernet address is multicast */
donatien	0:b802fc31f1db	868	dest = &mcastaddr;
donatien	0:b802fc31f1db	869	/* unicast destination IP address? */
donatien	0:b802fc31f1db	870	} else {
donatien	0:b802fc31f1db	871	/* outside local network? */
donatien	0:b802fc31f1db	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
donatien	0:b802fc31f1db	873	!ip_addr_islinklocal(ipaddr)) {
donatien	0:b802fc31f1db	874	/* interface has default gateway? */
donatien	0:b802fc31f1db	875	if (!ip_addr_isany(&netif->gw)) {
donatien	0:b802fc31f1db	876	/* send to hardware address of default gateway IP address */
donatien	0:b802fc31f1db	877	ipaddr = &(netif->gw);
donatien	0:b802fc31f1db	878	/* no default gateway available */
donatien	0:b802fc31f1db	879	} else {
donatien	0:b802fc31f1db	880	/* no route to destination error (default gateway missing) */
donatien	0:b802fc31f1db	881	return ERR_RTE;
donatien	0:b802fc31f1db	882	}
donatien	0:b802fc31f1db	883	}
donatien	1:3a7c15057192	884	#if LWIP_NETIF_HWADDRHINT
donatien	1:3a7c15057192	885	if (netif->addr_hint != NULL) {
donatien	1:3a7c15057192	886	/* per-pcb cached entry was given */
donatien	1:3a7c15057192	887	u8_t etharp_cached_entry = *(netif->addr_hint);
donatien	1:3a7c15057192	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
donatien	1:3a7c15057192	889	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	1:3a7c15057192	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
donatien	1:3a7c15057192	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
donatien	1:3a7c15057192	892	/* the per-pcb-cached entry is stable and the right one! */
donatien	1:3a7c15057192	893	ETHARP_STATS_INC(etharp.cachehit);
donatien	1:3a7c15057192	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
donatien	1:3a7c15057192	895	&arp_table[etharp_cached_entry].ethaddr);
donatien	1:3a7c15057192	896	}
donatien	1:3a7c15057192	897	#if LWIP_NETIF_HWADDRHINT
donatien	1:3a7c15057192	898	}
donatien	1:3a7c15057192	899	}
donatien	1:3a7c15057192	900	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:b802fc31f1db	901	/* queue on destination Ethernet address belonging to ipaddr */
donatien	0:b802fc31f1db	902	return etharp_query(netif, ipaddr, q);
donatien	0:b802fc31f1db	903	}
donatien	0:b802fc31f1db	904
donatien	0:b802fc31f1db	905	/* continuation for multicast/broadcast destinations */
donatien	0:b802fc31f1db	906	/* obtain source Ethernet address of the given interface */
donatien	0:b802fc31f1db	907	/* send packet directly on the link */
donatien	0:b802fc31f1db	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
donatien	0:b802fc31f1db	909	}
donatien	0:b802fc31f1db	910
donatien	0:b802fc31f1db	911	/**
donatien	0:b802fc31f1db	912	* Send an ARP request for the given IP address and/or queue a packet.
donatien	0:b802fc31f1db	913	*
donatien	0:b802fc31f1db	914	* If the IP address was not yet in the cache, a pending ARP cache entry
donatien	0:b802fc31f1db	915	* is added and an ARP request is sent for the given address. The packet
donatien	0:b802fc31f1db	916	* is queued on this entry.
donatien	0:b802fc31f1db	917	*
donatien	0:b802fc31f1db	918	* If the IP address was already pending in the cache, a new ARP request
donatien	0:b802fc31f1db	919	* is sent for the given address. The packet is queued on this entry.
donatien	0:b802fc31f1db	920	*
donatien	0:b802fc31f1db	921	* If the IP address was already stable in the cache, and a packet is
donatien	0:b802fc31f1db	922	* given, it is directly sent and no ARP request is sent out.
donatien	0:b802fc31f1db	923	*
donatien	0:b802fc31f1db	924	* If the IP address was already stable in the cache, and no packet is
donatien	0:b802fc31f1db	925	* given, an ARP request is sent out.
donatien	0:b802fc31f1db	926	*
donatien	0:b802fc31f1db	927	* @param netif The lwIP network interface on which ipaddr
donatien	0:b802fc31f1db	928	* must be queried for.
donatien	0:b802fc31f1db	929	* @param ipaddr The IP address to be resolved.
donatien	0:b802fc31f1db	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
donatien	0:b802fc31f1db	931	* q is not freed by this function.
donatien	0:b802fc31f1db	932	*
donatien	0:b802fc31f1db	933	* @note q must only be ONE packet, not a packet queue!
donatien	0:b802fc31f1db	934	*
donatien	0:b802fc31f1db	935	* @return
donatien	0:b802fc31f1db	936	* - ERR_BUF Could not make room for Ethernet header.
donatien	0:b802fc31f1db	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
donatien	0:b802fc31f1db	938	* to query for address or queue the packet.
donatien	0:b802fc31f1db	939	* - ERR_MEM Could not queue packet due to memory shortage.
donatien	0:b802fc31f1db	940	* - ERR_RTE No route to destination (no gateway to external networks).
donatien	0:b802fc31f1db	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
donatien	0:b802fc31f1db	942	*
donatien	0:b802fc31f1db	943	*/
donatien	0:b802fc31f1db	944	err_t
donatien	0:b802fc31f1db	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
donatien	0:b802fc31f1db	946	{
donatien	0:b802fc31f1db	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
donatien	0:b802fc31f1db	948	err_t result = ERR_MEM;
donatien	0:b802fc31f1db	949	s8_t i; /* ARP entry index */
donatien	0:b802fc31f1db	950
donatien	0:b802fc31f1db	951	/* non-unicast address? */
donatien	0:b802fc31f1db	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
donatien	0:b802fc31f1db	953	ip_addr_ismulticast(ipaddr) \|\|
donatien	0:b802fc31f1db	954	ip_addr_isany(ipaddr)) {
donatien	0:b802fc31f1db	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
donatien	0:b802fc31f1db	956	return ERR_ARG;
donatien	0:b802fc31f1db	957	}
donatien	0:b802fc31f1db	958
donatien	0:b802fc31f1db	959	/* find entry in ARP cache, ask to create entry if queueing packet */
donatien	1:3a7c15057192	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
donatien	0:b802fc31f1db	961
donatien	0:b802fc31f1db	962	/* could not find or create entry? */
donatien	0:b802fc31f1db	963	if (i < 0) {
donatien	0:b802fc31f1db	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
donatien	0:b802fc31f1db	965	if (q) {
donatien	0:b802fc31f1db	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
donatien	0:b802fc31f1db	967	ETHARP_STATS_INC(etharp.memerr);
donatien	0:b802fc31f1db	968	}
donatien	0:b802fc31f1db	969	return (err_t)i;
donatien	0:b802fc31f1db	970	}
donatien	0:b802fc31f1db	971
donatien	0:b802fc31f1db	972	/* mark a fresh entry as pending (we just sent a request) */
donatien	0:b802fc31f1db	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
donatien	0:b802fc31f1db	974	arp_table[i].state = ETHARP_STATE_PENDING;
donatien	0:b802fc31f1db	975	}
donatien	0:b802fc31f1db	976
donatien	0:b802fc31f1db	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
donatien	0:b802fc31f1db	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
donatien	0:b802fc31f1db	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
donatien	0:b802fc31f1db	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
donatien	0:b802fc31f1db	981
donatien	0:b802fc31f1db	982	/* do we have a pending entry? or an implicit query request? */
donatien	0:b802fc31f1db	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
donatien	0:b802fc31f1db	984	/* try to resolve it; send out ARP request */
donatien	0:b802fc31f1db	985	result = etharp_request(netif, ipaddr);
donatien	0:b802fc31f1db	986	if (result != ERR_OK) {
donatien	0:b802fc31f1db	987	/* ARP request couldn't be sent */
donatien	0:b802fc31f1db	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
donatien	0:b802fc31f1db	989	since this failure could be temporary, and the next packet calling
donatien	0:b802fc31f1db	990	etharp_query again could lead to sending the queued packets. */
donatien	0:b802fc31f1db	991	}
donatien	1:3a7c15057192	992	if (q == NULL) {
donatien	1:3a7c15057192	993	return result;
donatien	1:3a7c15057192	994	}
donatien	0:b802fc31f1db	995	}
donatien	1:3a7c15057192	996
donatien	0:b802fc31f1db	997	/* packet given? */
donatien	1:3a7c15057192	998	LWIP_ASSERT("q != NULL", q != NULL);
donatien	1:3a7c15057192	999	/* stable entry? */
donatien	1:3a7c15057192	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	1:3a7c15057192	1001	/* we have a valid IP->Ethernet address mapping */
donatien	1:3a7c15057192	1002	ETHARP_SET_HINT(netif, i);
donatien	1:3a7c15057192	1003	/* send the packet */
donatien	1:3a7c15057192	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
donatien	1:3a7c15057192	1005	/* pending entry? (either just created or already pending */
donatien	1:3a7c15057192	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	0:b802fc31f1db	1007	#if ARP_QUEUEING /* queue the given q packet */
donatien	1:3a7c15057192	1008	struct pbuf *p;
donatien	1:3a7c15057192	1009	int copy_needed = 0;
donatien	1:3a7c15057192	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
donatien	1:3a7c15057192	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
donatien	1:3a7c15057192	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
donatien	1:3a7c15057192	1013	p = q;
donatien	1:3a7c15057192	1014	while (p) {
donatien	1:3a7c15057192	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
donatien	1:3a7c15057192	1016	if(p->type != PBUF_ROM) {
donatien	1:3a7c15057192	1017	copy_needed = 1;
donatien	1:3a7c15057192	1018	break;
donatien	1:3a7c15057192	1019	}
donatien	1:3a7c15057192	1020	p = p->next;
donatien	1:3a7c15057192	1021	}
donatien	1:3a7c15057192	1022	if(copy_needed) {
donatien	1:3a7c15057192	1023	/* copy the whole packet into new pbufs */
donatien	1:3a7c15057192	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
donatien	1:3a7c15057192	1025	if(p != NULL) {
donatien	1:3a7c15057192	1026	if (pbuf_copy(p, q) != ERR_OK) {
donatien	1:3a7c15057192	1027	pbuf_free(p);
donatien	1:3a7c15057192	1028	p = NULL;
donatien	1:3a7c15057192	1029	}
donatien	1:3a7c15057192	1030	}
donatien	1:3a7c15057192	1031	} else {
donatien	1:3a7c15057192	1032	/* referencing the old pbuf is enough */
donatien	0:b802fc31f1db	1033	p = q;
donatien	1:3a7c15057192	1034	pbuf_ref(p);
donatien	1:3a7c15057192	1035	}
donatien	1:3a7c15057192	1036	/* packet could be taken over? */
donatien	1:3a7c15057192	1037	if (p != NULL) {
donatien	1:3a7c15057192	1038	/* queue packet ... */
donatien	1:3a7c15057192	1039	struct etharp_q_entry *new_entry;
donatien	1:3a7c15057192	1040	/* allocate a new arp queue entry */
donatien	1:3a7c15057192	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
donatien	1:3a7c15057192	1042	if (new_entry != NULL) {
donatien	1:3a7c15057192	1043	new_entry->next = 0;
donatien	1:3a7c15057192	1044	new_entry->p = p;
donatien	1:3a7c15057192	1045	if(arp_table[i].q != NULL) {
donatien	1:3a7c15057192	1046	/* queue was already existent, append the new entry to the end */
donatien	1:3a7c15057192	1047	struct etharp_q_entry *r;
donatien	1:3a7c15057192	1048	r = arp_table[i].q;
donatien	1:3a7c15057192	1049	while (r->next != NULL) {
donatien	1:3a7c15057192	1050	r = r->next;
donatien	1:3a7c15057192	1051	}
donatien	1:3a7c15057192	1052	r->next = new_entry;
donatien	1:3a7c15057192	1053	} else {
donatien	1:3a7c15057192	1054	/* queue did not exist, first item in queue */
donatien	1:3a7c15057192	1055	arp_table[i].q = new_entry;
donatien	0:b802fc31f1db	1056	}
donatien	1:3a7c15057192	1057	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
donatien	1:3a7c15057192	1058	result = ERR_OK;
donatien	0:b802fc31f1db	1059	} else {
donatien	1:3a7c15057192	1060	/* the pool MEMP_ARP_QUEUE is empty */
donatien	1:3a7c15057192	1061	pbuf_free(p);
donatien	0:b802fc31f1db	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));
donatien	0:b802fc31f1db	1063	/* { result == ERR_MEM } through initialization */
donatien	0:b802fc31f1db	1064	}
donatien	1:3a7c15057192	1065	} else {
donatien	1:3a7c15057192	1066	ETHARP_STATS_INC(etharp.memerr);
donatien	1:3a7c15057192	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));
donatien	0:b802fc31f1db	1068	/* { result == ERR_MEM } through initialization */
donatien	1:3a7c15057192	1069	}
donatien	1:3a7c15057192	1070	#else /* ARP_QUEUEING */
donatien	1:3a7c15057192	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
donatien	1:3a7c15057192	1072	/* { result == ERR_MEM } through initialization */
donatien	1:3a7c15057192	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
donatien	0:b802fc31f1db	1074	#endif /* ARP_QUEUEING */
donatien	0:b802fc31f1db	1075	}
donatien	0:b802fc31f1db	1076	return result;
donatien	0:b802fc31f1db	1077	}
donatien	0:b802fc31f1db	1078
donatien	0:b802fc31f1db	1079	/**
donatien	0:b802fc31f1db	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
donatien	0:b802fc31f1db	1081	*
donatien	0:b802fc31f1db	1082	* @param netif the lwip network interface on which to send the ARP packet
donatien	0:b802fc31f1db	1083	* @param ethsrc_addr the source MAC address for the ethernet header
donatien	0:b802fc31f1db	1084	* @param ethdst_addr the destination MAC address for the ethernet header
donatien	0:b802fc31f1db	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
donatien	0:b802fc31f1db	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
donatien	0:b802fc31f1db	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
donatien	0:b802fc31f1db	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
donatien	0:b802fc31f1db	1089	* @param opcode the type of the ARP packet
donatien	0:b802fc31f1db	1090	* @return ERR_OK if the ARP packet has been sent
donatien	0:b802fc31f1db	1091	* ERR_MEM if the ARP packet couldn't be allocated
donatien	0:b802fc31f1db	1092	* any other err_t on failure
donatien	0:b802fc31f1db	1093	*/
donatien	0:b802fc31f1db	1094	#if !LWIP_AUTOIP
donatien	0:b802fc31f1db	1095	static
donatien	0:b802fc31f1db	1096	#endif /* LWIP_AUTOIP */
donatien	0:b802fc31f1db	1097	err_t
donatien	0:b802fc31f1db	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
donatien	0:b802fc31f1db	1099	const struct eth_addr *ethdst_addr,
donatien	0:b802fc31f1db	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
donatien	0:b802fc31f1db	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
donatien	0:b802fc31f1db	1102	const u16_t opcode)
donatien	0:b802fc31f1db	1103	{
donatien	0:b802fc31f1db	1104	struct pbuf *p;
donatien	0:b802fc31f1db	1105	err_t result = ERR_OK;
donatien	0:b802fc31f1db	1106	struct eth_hdr *ethhdr;
donatien	0:b802fc31f1db	1107	struct etharp_hdr *hdr;
donatien	0:b802fc31f1db	1108	#if LWIP_AUTOIP
donatien	0:b802fc31f1db	1109	const u8_t * ethdst_hwaddr;
donatien	0:b802fc31f1db	1110	#endif /* LWIP_AUTOIP */
donatien	0:b802fc31f1db	1111
donatien	0:b802fc31f1db	1112	/* allocate a pbuf for the outgoing ARP request packet */
donatien	0:b802fc31f1db	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
donatien	0:b802fc31f1db	1114	/* could allocate a pbuf for an ARP request? */
donatien	0:b802fc31f1db	1115	if (p == NULL) {
donatien	0:b802fc31f1db	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:b802fc31f1db	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
donatien	0:b802fc31f1db	1118	ETHARP_STATS_INC(etharp.memerr);
donatien	0:b802fc31f1db	1119	return ERR_MEM;
donatien	0:b802fc31f1db	1120	}
donatien	0:b802fc31f1db	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
donatien	0:b802fc31f1db	1122	(p->len >= SIZEOF_ETHARP_PACKET));
donatien	0:b802fc31f1db	1123
donatien	0:b802fc31f1db	1124	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:b802fc31f1db	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:b802fc31f1db	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
donatien	0:b802fc31f1db	1127	hdr->opcode = htons(opcode);
donatien	0:b802fc31f1db	1128
donatien	0:b802fc31f1db	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:b802fc31f1db	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:b802fc31f1db	1131	#if LWIP_AUTOIP
donatien	0:b802fc31f1db	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
donatien	0:b802fc31f1db	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
donatien	0:b802fc31f1db	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
donatien	0:b802fc31f1db	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
donatien	0:b802fc31f1db	1136	#endif /* LWIP_AUTOIP */
donatien	1:3a7c15057192	1137	/* Write the ARP MAC-Addresses */
donatien	1:3a7c15057192	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
donatien	1:3a7c15057192	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
donatien	1:3a7c15057192	1140	/* Write the Ethernet MAC-Addresses */
donatien	0:b802fc31f1db	1141	#if LWIP_AUTOIP
donatien	1:3a7c15057192	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
donatien	0:b802fc31f1db	1143	#else /* LWIP_AUTOIP */
donatien	1:3a7c15057192	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
donatien	0:b802fc31f1db	1145	#endif /* LWIP_AUTOIP */
donatien	1:3a7c15057192	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
donatien	0:b802fc31f1db	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
donatien	0:b802fc31f1db	1148	* structure packing. */
donatien	1:3a7c15057192	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
donatien	1:3a7c15057192	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
donatien	0:b802fc31f1db	1151
donatien	1:3a7c15057192	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
donatien	1:3a7c15057192	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
donatien	1:3a7c15057192	1154	/* set hwlen and protolen */
donatien	1:3a7c15057192	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
donatien	1:3a7c15057192	1156	hdr->protolen = sizeof(ip_addr_t);
donatien	0:b802fc31f1db	1157
donatien	1:3a7c15057192	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
donatien	0:b802fc31f1db	1159	/* send ARP query */
donatien	0:b802fc31f1db	1160	result = netif->linkoutput(netif, p);
donatien	0:b802fc31f1db	1161	ETHARP_STATS_INC(etharp.xmit);
donatien	0:b802fc31f1db	1162	/* free ARP query packet */
donatien	0:b802fc31f1db	1163	pbuf_free(p);
donatien	0:b802fc31f1db	1164	p = NULL;
donatien	0:b802fc31f1db	1165	/* could not allocate pbuf for ARP request */
donatien	0:b802fc31f1db	1166
donatien	0:b802fc31f1db	1167	return result;
donatien	0:b802fc31f1db	1168	}
donatien	0:b802fc31f1db	1169
donatien	0:b802fc31f1db	1170	/**
donatien	0:b802fc31f1db	1171	* Send an ARP request packet asking for ipaddr.
donatien	0:b802fc31f1db	1172	*
donatien	0:b802fc31f1db	1173	* @param netif the lwip network interface on which to send the request
donatien	0:b802fc31f1db	1174	* @param ipaddr the IP address for which to ask
donatien	0:b802fc31f1db	1175	* @return ERR_OK if the request has been sent
donatien	0:b802fc31f1db	1176	* ERR_MEM if the ARP packet couldn't be allocated
donatien	0:b802fc31f1db	1177	* any other err_t on failure
donatien	0:b802fc31f1db	1178	*/
donatien	0:b802fc31f1db	1179	err_t
donatien	0:b802fc31f1db	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
donatien	0:b802fc31f1db	1181	{
donatien	0:b802fc31f1db	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
donatien	0:b802fc31f1db	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
donatien	0:b802fc31f1db	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
donatien	0:b802fc31f1db	1185	ipaddr, ARP_REQUEST);
donatien	0:b802fc31f1db	1186	}
donatien	0:b802fc31f1db	1187	#endif /* LWIP_ARP */
donatien	0:b802fc31f1db	1188
donatien	0:b802fc31f1db	1189	/**
donatien	0:b802fc31f1db	1190	* Process received ethernet frames. Using this function instead of directly
donatien	0:b802fc31f1db	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
donatien	0:b802fc31f1db	1192	* the ARP cache is protected from concurrent access.
donatien	0:b802fc31f1db	1193	*
donatien	0:b802fc31f1db	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
donatien	0:b802fc31f1db	1195	* @param netif the network interface on which the packet was received
donatien	0:b802fc31f1db	1196	*/
donatien	0:b802fc31f1db	1197	err_t
donatien	0:b802fc31f1db	1198	ethernet_input(struct pbuf p, struct netif netif)
donatien	0:b802fc31f1db	1199	{
donatien	0:b802fc31f1db	1200	struct eth_hdr* ethhdr;
donatien	0:b802fc31f1db	1201	u16_t type;
donatien	0:b802fc31f1db	1202
donatien	0:b802fc31f1db	1203	/* points to packet payload, which starts with an Ethernet header */
donatien	0:b802fc31f1db	1204	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:b802fc31f1db	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
donatien	0:b802fc31f1db	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",
donatien	0:b802fc31f1db	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
donatien	0:b802fc31f1db	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
donatien	0:b802fc31f1db	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
donatien	0:b802fc31f1db	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
donatien	0:b802fc31f1db	1211	(unsigned)htons(ethhdr->type)));
donatien	0:b802fc31f1db	1212
donatien	1:3a7c15057192	1213	type = ethhdr->type;
donatien	0:b802fc31f1db	1214	#if ETHARP_SUPPORT_VLAN
donatien	1:3a7c15057192	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
donatien	0:b802fc31f1db	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
donatien	0:b802fc31f1db	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
donatien	0:b802fc31f1db	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
donatien	0:b802fc31f1db	1219	/* silently ignore this packet: not for our VLAN */
donatien	0:b802fc31f1db	1220	pbuf_free(p);
donatien	0:b802fc31f1db	1221	return ERR_OK;
donatien	0:b802fc31f1db	1222	}
donatien	0:b802fc31f1db	1223	#endif /* ETHARP_VLAN_CHECK */
donatien	1:3a7c15057192	1224	type = vlan->tpid;
donatien	0:b802fc31f1db	1225	}
donatien	0:b802fc31f1db	1226	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:b802fc31f1db	1227
donatien	1:3a7c15057192	1228	#if LWIP_ARP_FILTER_NETIF
donatien	1:3a7c15057192	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
donatien	1:3a7c15057192	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
donatien	1:3a7c15057192	1231
donatien	0:b802fc31f1db	1232	switch (type) {
donatien	0:b802fc31f1db	1233	#if LWIP_ARP
donatien	0:b802fc31f1db	1234	/* IP packet? */
donatien	1:3a7c15057192	1235	case PP_HTONS(ETHTYPE_IP):
donatien	0:b802fc31f1db	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
donatien	0:b802fc31f1db	1237	goto free_and_return;
donatien	0:b802fc31f1db	1238	}
donatien	0:b802fc31f1db	1239	#if ETHARP_TRUST_IP_MAC
donatien	0:b802fc31f1db	1240	/* update ARP table */
donatien	0:b802fc31f1db	1241	etharp_ip_input(netif, p);
donatien	0:b802fc31f1db	1242	#endif /* ETHARP_TRUST_IP_MAC */
donatien	0:b802fc31f1db	1243	/* skip Ethernet header */
donatien	0:b802fc31f1db	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
donatien	0:b802fc31f1db	1245	LWIP_ASSERT("Can't move over header in packet", 0);
donatien	0:b802fc31f1db	1246	goto free_and_return;
donatien	0:b802fc31f1db	1247	} else {
donatien	0:b802fc31f1db	1248	/* pass to IP layer */
donatien	0:b802fc31f1db	1249	ip_input(p, netif);
donatien	0:b802fc31f1db	1250	}
donatien	0:b802fc31f1db	1251	break;
donatien	0:b802fc31f1db	1252
donatien	1:3a7c15057192	1253	case PP_HTONS(ETHTYPE_ARP):
donatien	0:b802fc31f1db	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
donatien	0:b802fc31f1db	1255	goto free_and_return;
donatien	0:b802fc31f1db	1256	}
donatien	0:b802fc31f1db	1257	/* pass p to ARP module */
donatien	0:b802fc31f1db	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
donatien	0:b802fc31f1db	1259	break;
donatien	0:b802fc31f1db	1260	#endif /* LWIP_ARP */
donatien	0:b802fc31f1db	1261	#if PPPOE_SUPPORT
donatien	1:3a7c15057192	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
donatien	0:b802fc31f1db	1263	pppoe_disc_input(netif, p);
donatien	0:b802fc31f1db	1264	break;
donatien	0:b802fc31f1db	1265
donatien	1:3a7c15057192	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
donatien	0:b802fc31f1db	1267	pppoe_data_input(netif, p);
donatien	0:b802fc31f1db	1268	break;
donatien	0:b802fc31f1db	1269	#endif /* PPPOE_SUPPORT */
donatien	0:b802fc31f1db	1270
donatien	0:b802fc31f1db	1271	default:
donatien	0:b802fc31f1db	1272	ETHARP_STATS_INC(etharp.proterr);
donatien	0:b802fc31f1db	1273	ETHARP_STATS_INC(etharp.drop);
donatien	0:b802fc31f1db	1274	goto free_and_return;
donatien	0:b802fc31f1db	1275	}
donatien	0:b802fc31f1db	1276
donatien	0:b802fc31f1db	1277	/* This means the pbuf is freed or consumed,
donatien	0:b802fc31f1db	1278	so the caller doesn't have to free it again */
donatien	0:b802fc31f1db	1279	return ERR_OK;
donatien	0:b802fc31f1db	1280
donatien	0:b802fc31f1db	1281	free_and_return:
donatien	0:b802fc31f1db	1282	pbuf_free(p);
donatien	0:b802fc31f1db	1283	return ERR_OK;
donatien	0:b802fc31f1db	1284	}
donatien	0:b802fc31f1db	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Program
Created:	09 Jul 2010
Imports:	20
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	3

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lwip/netif/etharp.c@4:e00281c7453d, 2010-08-06 (annotated)

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