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lwip/netif/etharp.c@0:d616ece2d859, 2010-09-18 (annotated)

Committer:: mbed714
Date:: Sat Sep 18 23:05:49 2010 +0000
Revision:: 0:d616ece2d859

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User	Revision	Line number	New contents of line
mbed714	0:d616ece2d859	1	/**
mbed714	0:d616ece2d859	2	* @file
mbed714	0:d616ece2d859	3	* Address Resolution Protocol module for IP over Ethernet
mbed714	0:d616ece2d859	4	*
mbed714	0:d616ece2d859	5	* Functionally, ARP is divided into two parts. The first maps an IP address
mbed714	0:d616ece2d859	6	* to a physical address when sending a packet, and the second part answers
mbed714	0:d616ece2d859	7	* requests from other machines for our physical address.
mbed714	0:d616ece2d859	8	*
mbed714	0:d616ece2d859	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
mbed714	0:d616ece2d859	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
mbed714	0:d616ece2d859	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
mbed714	0:d616ece2d859	12	*/
mbed714	0:d616ece2d859	13
mbed714	0:d616ece2d859	14	/*
mbed714	0:d616ece2d859	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
mbed714	0:d616ece2d859	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
mbed714	0:d616ece2d859	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
mbed714	0:d616ece2d859	18	* All rights reserved.
mbed714	0:d616ece2d859	19	*
mbed714	0:d616ece2d859	20	* Redistribution and use in source and binary forms, with or without modification,
mbed714	0:d616ece2d859	21	* are permitted provided that the following conditions are met:
mbed714	0:d616ece2d859	22	*
mbed714	0:d616ece2d859	23	* 1. Redistributions of source code must retain the above copyright notice,
mbed714	0:d616ece2d859	24	* this list of conditions and the following disclaimer.
mbed714	0:d616ece2d859	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
mbed714	0:d616ece2d859	26	* this list of conditions and the following disclaimer in the documentation
mbed714	0:d616ece2d859	27	* and/or other materials provided with the distribution.
mbed714	0:d616ece2d859	28	* 3. The name of the author may not be used to endorse or promote products
mbed714	0:d616ece2d859	29	* derived from this software without specific prior written permission.
mbed714	0:d616ece2d859	30	*
mbed714	0:d616ece2d859	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed714	0:d616ece2d859	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed714	0:d616ece2d859	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed714	0:d616ece2d859	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed714	0:d616ece2d859	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed714	0:d616ece2d859	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed714	0:d616ece2d859	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed714	0:d616ece2d859	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed714	0:d616ece2d859	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed714	0:d616ece2d859	40	* OF SUCH DAMAGE.
mbed714	0:d616ece2d859	41	*
mbed714	0:d616ece2d859	42	* This file is part of the lwIP TCP/IP stack.
mbed714	0:d616ece2d859	43	*
mbed714	0:d616ece2d859	44	*/
mbed714	0:d616ece2d859	45
mbed714	0:d616ece2d859	46	#include "lwip/opt.h"
mbed714	0:d616ece2d859	47
mbed714	0:d616ece2d859	48	#if LWIP_ARP \|\| LWIP_ETHERNET
mbed714	0:d616ece2d859	49
mbed714	0:d616ece2d859	50	#include "lwip/ip_addr.h"
mbed714	0:d616ece2d859	51	#include "lwip/def.h"
mbed714	0:d616ece2d859	52	#include "lwip/ip.h"
mbed714	0:d616ece2d859	53	#include "lwip/stats.h"
mbed714	0:d616ece2d859	54	#include "lwip/snmp.h"
mbed714	0:d616ece2d859	55	#include "lwip/dhcp.h"
mbed714	0:d616ece2d859	56	#include "lwip/autoip.h"
mbed714	0:d616ece2d859	57	#include "netif/etharp.h"
mbed714	0:d616ece2d859	58
mbed714	0:d616ece2d859	59	#if PPPOE_SUPPORT
mbed714	0:d616ece2d859	60	#include "netif/ppp_oe.h"
mbed714	0:d616ece2d859	61	#endif /* PPPOE_SUPPORT */
mbed714	0:d616ece2d859	62
mbed714	0:d616ece2d859	63	#include <string.h>
mbed714	0:d616ece2d859	64
mbed714	0:d616ece2d859	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
mbed714	0:d616ece2d859	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
mbed714	0:d616ece2d859	67
mbed714	0:d616ece2d859	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
mbed714	0:d616ece2d859	69
mbed714	0:d616ece2d859	70	/** the time an ARP entry stays valid after its last update,
mbed714	0:d616ece2d859	71	* for ARP_TMR_INTERVAL = 5000, this is
mbed714	0:d616ece2d859	72	* (240 * 5) seconds = 20 minutes.
mbed714	0:d616ece2d859	73	*/
mbed714	0:d616ece2d859	74	#define ARP_MAXAGE 240
mbed714	0:d616ece2d859	75	/** the time an ARP entry stays pending after first request,
mbed714	0:d616ece2d859	76	* for ARP_TMR_INTERVAL = 5000, this is
mbed714	0:d616ece2d859	77	* (2 * 5) seconds = 10 seconds.
mbed714	0:d616ece2d859	78	*
mbed714	0:d616ece2d859	79	* @internal Keep this number at least 2, otherwise it might
mbed714	0:d616ece2d859	80	* run out instantly if the timeout occurs directly after a request.
mbed714	0:d616ece2d859	81	*/
mbed714	0:d616ece2d859	82	#define ARP_MAXPENDING 2
mbed714	0:d616ece2d859	83
mbed714	0:d616ece2d859	84	#define HWTYPE_ETHERNET 1
mbed714	0:d616ece2d859	85
mbed714	0:d616ece2d859	86	enum etharp_state {
mbed714	0:d616ece2d859	87	ETHARP_STATE_EMPTY = 0,
mbed714	0:d616ece2d859	88	ETHARP_STATE_PENDING,
mbed714	0:d616ece2d859	89	ETHARP_STATE_STABLE
mbed714	0:d616ece2d859	90	};
mbed714	0:d616ece2d859	91
mbed714	0:d616ece2d859	92	struct etharp_entry {
mbed714	0:d616ece2d859	93	#if ARP_QUEUEING
mbed714	0:d616ece2d859	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
mbed714	0:d616ece2d859	95	struct etharp_q_entry *q;
mbed714	0:d616ece2d859	96	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	97	ip_addr_t ipaddr;
mbed714	0:d616ece2d859	98	struct eth_addr ethaddr;
mbed714	0:d616ece2d859	99	#if LWIP_SNMP
mbed714	0:d616ece2d859	100	struct netif *netif;
mbed714	0:d616ece2d859	101	#endif /* LWIP_SNMP */
mbed714	0:d616ece2d859	102	u8_t state;
mbed714	0:d616ece2d859	103	u8_t ctime;
mbed714	0:d616ece2d859	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	105	u8_t static_entry;
mbed714	0:d616ece2d859	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	107	};
mbed714	0:d616ece2d859	108
mbed714	0:d616ece2d859	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
mbed714	0:d616ece2d859	110
mbed714	0:d616ece2d859	111	#if !LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	112	static u8_t etharp_cached_entry;
mbed714	0:d616ece2d859	113	#endif /* !LWIP_NETIF_HWADDRHINT */
mbed714	0:d616ece2d859	114
mbed714	0:d616ece2d859	115	/** Try hard to create a new entry - we want the IP address to appear in
mbed714	0:d616ece2d859	116	the cache (even if this means removing an active entry or so). */
mbed714	0:d616ece2d859	117	#define ETHARP_FLAG_TRY_HARD 1
mbed714	0:d616ece2d859	118	#define ETHARP_FLAG_FIND_ONLY 2
mbed714	0:d616ece2d859	119	#define ETHARP_FLAG_STATIC_ENTRY 4
mbed714	0:d616ece2d859	120
mbed714	0:d616ece2d859	121	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
mbed714	0:d616ece2d859	123	*((netif)->addr_hint) = (hint);
mbed714	0:d616ece2d859	124	#else /* LWIP_NETIF_HWADDRHINT */
mbed714	0:d616ece2d859	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
mbed714	0:d616ece2d859	126	#endif /* LWIP_NETIF_HWADDRHINT */
mbed714	0:d616ece2d859	127
mbed714	0:d616ece2d859	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
mbed714	0:d616ece2d859	129
mbed714	0:d616ece2d859	130
mbed714	0:d616ece2d859	131	/* Some checks, instead of etharp_init(): */
mbed714	0:d616ece2d859	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
mbed714	0:d616ece2d859	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
mbed714	0:d616ece2d859	134	#endif
mbed714	0:d616ece2d859	135
mbed714	0:d616ece2d859	136
mbed714	0:d616ece2d859	137	#if ARP_QUEUEING
mbed714	0:d616ece2d859	138	/**
mbed714	0:d616ece2d859	139	* Free a complete queue of etharp entries
mbed714	0:d616ece2d859	140	*
mbed714	0:d616ece2d859	141	* @param q a qeueue of etharp_q_entry's to free
mbed714	0:d616ece2d859	142	*/
mbed714	0:d616ece2d859	143	static void
mbed714	0:d616ece2d859	144	free_etharp_q(struct etharp_q_entry *q)
mbed714	0:d616ece2d859	145	{
mbed714	0:d616ece2d859	146	struct etharp_q_entry *r;
mbed714	0:d616ece2d859	147	LWIP_ASSERT("q != NULL", q != NULL);
mbed714	0:d616ece2d859	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
mbed714	0:d616ece2d859	149	while (q) {
mbed714	0:d616ece2d859	150	r = q;
mbed714	0:d616ece2d859	151	q = q->next;
mbed714	0:d616ece2d859	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
mbed714	0:d616ece2d859	153	pbuf_free(r->p);
mbed714	0:d616ece2d859	154	memp_free(MEMP_ARP_QUEUE, r);
mbed714	0:d616ece2d859	155	}
mbed714	0:d616ece2d859	156	}
mbed714	0:d616ece2d859	157	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	158
mbed714	0:d616ece2d859	159	/** Clean up ARP table entries */
mbed714	0:d616ece2d859	160	static void
mbed714	0:d616ece2d859	161	free_entry(int i)
mbed714	0:d616ece2d859	162	{
mbed714	0:d616ece2d859	163	/* remove from SNMP ARP index tree */
mbed714	0:d616ece2d859	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
mbed714	0:d616ece2d859	165	#if ARP_QUEUEING
mbed714	0:d616ece2d859	166	/* and empty packet queue */
mbed714	0:d616ece2d859	167	if (arp_table[i].q != NULL) {
mbed714	0:d616ece2d859	168	/* remove all queued packets */
mbed714	0:d616ece2d859	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
mbed714	0:d616ece2d859	170	free_etharp_q(arp_table[i].q);
mbed714	0:d616ece2d859	171	arp_table[i].q = NULL;
mbed714	0:d616ece2d859	172	}
mbed714	0:d616ece2d859	173	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	174	/* recycle entry for re-use */
mbed714	0:d616ece2d859	175	arp_table[i].state = ETHARP_STATE_EMPTY;
mbed714	0:d616ece2d859	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	177	arp_table[i].static_entry = 0;
mbed714	0:d616ece2d859	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	179	#ifdef LWIP_DEBUG
mbed714	0:d616ece2d859	180	/* for debugging, clean out the complete entry */
mbed714	0:d616ece2d859	181	arp_table[i].ctime = 0;
mbed714	0:d616ece2d859	182	#if LWIP_SNMP
mbed714	0:d616ece2d859	183	arp_table[i].netif = NULL;
mbed714	0:d616ece2d859	184	#endif /* LWIP_SNMP */
mbed714	0:d616ece2d859	185	ip_addr_set_zero(&arp_table[i].ipaddr);
mbed714	0:d616ece2d859	186	arp_table[i].ethaddr = ethzero;
mbed714	0:d616ece2d859	187	#endif /* LWIP_DEBUG */
mbed714	0:d616ece2d859	188	}
mbed714	0:d616ece2d859	189
mbed714	0:d616ece2d859	190	/**
mbed714	0:d616ece2d859	191	* Clears expired entries in the ARP table.
mbed714	0:d616ece2d859	192	*
mbed714	0:d616ece2d859	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
mbed714	0:d616ece2d859	194	* in order to expire entries in the ARP table.
mbed714	0:d616ece2d859	195	*/
mbed714	0:d616ece2d859	196	void
mbed714	0:d616ece2d859	197	etharp_tmr(void)
mbed714	0:d616ece2d859	198	{
mbed714	0:d616ece2d859	199	u8_t i;
mbed714	0:d616ece2d859	200
mbed714	0:d616ece2d859	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
mbed714	0:d616ece2d859	202	/* remove expired entries from the ARP table */
mbed714	0:d616ece2d859	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
mbed714	0:d616ece2d859	204	u8_t state = arp_table[i].state;
mbed714	0:d616ece2d859	205	if (state != ETHARP_STATE_EMPTY
mbed714	0:d616ece2d859	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	207	&& (arp_table[i].static_entry == 0)
mbed714	0:d616ece2d859	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	209	) {
mbed714	0:d616ece2d859	210	arp_table[i].ctime++;
mbed714	0:d616ece2d859	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
mbed714	0:d616ece2d859	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
mbed714	0:d616ece2d859	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
mbed714	0:d616ece2d859	214	/* pending or stable entry has become old! */
mbed714	0:d616ece2d859	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
mbed714	0:d616ece2d859	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
mbed714	0:d616ece2d859	217	/* clean up entries that have just been expired */
mbed714	0:d616ece2d859	218	free_entry(i);
mbed714	0:d616ece2d859	219	}
mbed714	0:d616ece2d859	220	#if ARP_QUEUEING
mbed714	0:d616ece2d859	221	/* still pending entry? (not expired) */
mbed714	0:d616ece2d859	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
mbed714	0:d616ece2d859	223	/* resend an ARP query here? */
mbed714	0:d616ece2d859	224	}
mbed714	0:d616ece2d859	225	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	226	}
mbed714	0:d616ece2d859	227	}
mbed714	0:d616ece2d859	228	}
mbed714	0:d616ece2d859	229
mbed714	0:d616ece2d859	230	/**
mbed714	0:d616ece2d859	231	* Search the ARP table for a matching or new entry.
mbed714	0:d616ece2d859	232	*
mbed714	0:d616ece2d859	233	* If an IP address is given, return a pending or stable ARP entry that matches
mbed714	0:d616ece2d859	234	* the address. If no match is found, create a new entry with this address set,
mbed714	0:d616ece2d859	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
mbed714	0:d616ece2d859	236	* state of the returned entry.
mbed714	0:d616ece2d859	237	*
mbed714	0:d616ece2d859	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
mbed714	0:d616ece2d859	239	*
mbed714	0:d616ece2d859	240	* In all cases, attempt to create new entries from an empty entry. If no
mbed714	0:d616ece2d859	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
mbed714	0:d616ece2d859	242	* old entries. Heuristic choose the least important entry for recycling.
mbed714	0:d616ece2d859	243	*
mbed714	0:d616ece2d859	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
mbed714	0:d616ece2d859	245	* @param flags @see definition of ETHARP_FLAG_*
mbed714	0:d616ece2d859	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
mbed714	0:d616ece2d859	247	*
mbed714	0:d616ece2d859	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
mbed714	0:d616ece2d859	249	* entry is found or could be recycled.
mbed714	0:d616ece2d859	250	*/
mbed714	0:d616ece2d859	251	static s8_t
mbed714	0:d616ece2d859	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
mbed714	0:d616ece2d859	253	{
mbed714	0:d616ece2d859	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
mbed714	0:d616ece2d859	255	s8_t empty = ARP_TABLE_SIZE;
mbed714	0:d616ece2d859	256	u8_t i = 0, age_pending = 0, age_stable = 0;
mbed714	0:d616ece2d859	257	#if ARP_QUEUEING
mbed714	0:d616ece2d859	258	/* oldest entry with packets on queue */
mbed714	0:d616ece2d859	259	s8_t old_queue = ARP_TABLE_SIZE;
mbed714	0:d616ece2d859	260	/* its age */
mbed714	0:d616ece2d859	261	u8_t age_queue = 0;
mbed714	0:d616ece2d859	262	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	263
mbed714	0:d616ece2d859	264	/**
mbed714	0:d616ece2d859	265	* a) do a search through the cache, remember candidates
mbed714	0:d616ece2d859	266	* b) select candidate entry
mbed714	0:d616ece2d859	267	* c) create new entry
mbed714	0:d616ece2d859	268	*/
mbed714	0:d616ece2d859	269
mbed714	0:d616ece2d859	270	/* a) in a single search sweep, do all of this
mbed714	0:d616ece2d859	271	* 1) remember the first empty entry (if any)
mbed714	0:d616ece2d859	272	* 2) remember the oldest stable entry (if any)
mbed714	0:d616ece2d859	273	* 3) remember the oldest pending entry without queued packets (if any)
mbed714	0:d616ece2d859	274	* 4) remember the oldest pending entry with queued packets (if any)
mbed714	0:d616ece2d859	275	* 5) search for a matching IP entry, either pending or stable
mbed714	0:d616ece2d859	276	* until 5 matches, or all entries are searched for.
mbed714	0:d616ece2d859	277	*/
mbed714	0:d616ece2d859	278
mbed714	0:d616ece2d859	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
mbed714	0:d616ece2d859	280	u8_t state = arp_table[i].state;
mbed714	0:d616ece2d859	281	/* no empty entry found yet and now we do find one? */
mbed714	0:d616ece2d859	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
mbed714	0:d616ece2d859	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
mbed714	0:d616ece2d859	284	/* remember first empty entry */
mbed714	0:d616ece2d859	285	empty = i;
mbed714	0:d616ece2d859	286	} else if (state != ETHARP_STATE_EMPTY) {
mbed714	0:d616ece2d859	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
mbed714	0:d616ece2d859	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
mbed714	0:d616ece2d859	289	/* if given, does IP address match IP address in ARP entry? */
mbed714	0:d616ece2d859	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
mbed714	0:d616ece2d859	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
mbed714	0:d616ece2d859	292	/* found exact IP address match, simply bail out */
mbed714	0:d616ece2d859	293	return i;
mbed714	0:d616ece2d859	294	}
mbed714	0:d616ece2d859	295	/* pending entry? */
mbed714	0:d616ece2d859	296	if (state == ETHARP_STATE_PENDING) {
mbed714	0:d616ece2d859	297	/* pending with queued packets? */
mbed714	0:d616ece2d859	298	#if ARP_QUEUEING
mbed714	0:d616ece2d859	299	if (arp_table[i].q != NULL) {
mbed714	0:d616ece2d859	300	if (arp_table[i].ctime >= age_queue) {
mbed714	0:d616ece2d859	301	old_queue = i;
mbed714	0:d616ece2d859	302	age_queue = arp_table[i].ctime;
mbed714	0:d616ece2d859	303	}
mbed714	0:d616ece2d859	304	} else
mbed714	0:d616ece2d859	305	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	306	/* pending without queued packets? */
mbed714	0:d616ece2d859	307	{
mbed714	0:d616ece2d859	308	if (arp_table[i].ctime >= age_pending) {
mbed714	0:d616ece2d859	309	old_pending = i;
mbed714	0:d616ece2d859	310	age_pending = arp_table[i].ctime;
mbed714	0:d616ece2d859	311	}
mbed714	0:d616ece2d859	312	}
mbed714	0:d616ece2d859	313	/* stable entry? */
mbed714	0:d616ece2d859	314	} else if (state == ETHARP_STATE_STABLE) {
mbed714	0:d616ece2d859	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	316	/* don't record old_stable for static entries since they never expire */
mbed714	0:d616ece2d859	317	if (arp_table[i].static_entry == 0)
mbed714	0:d616ece2d859	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	319	{
mbed714	0:d616ece2d859	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
mbed714	0:d616ece2d859	321	if (arp_table[i].ctime >= age_stable) {
mbed714	0:d616ece2d859	322	old_stable = i;
mbed714	0:d616ece2d859	323	age_stable = arp_table[i].ctime;
mbed714	0:d616ece2d859	324	}
mbed714	0:d616ece2d859	325	}
mbed714	0:d616ece2d859	326	}
mbed714	0:d616ece2d859	327	}
mbed714	0:d616ece2d859	328	}
mbed714	0:d616ece2d859	329	/* { we have no match } => try to create a new entry */
mbed714	0:d616ece2d859	330
mbed714	0:d616ece2d859	331	/* don't create new entry, only search? */
mbed714	0:d616ece2d859	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
mbed714	0:d616ece2d859	333	/* or no empty entry found and not allowed to recycle? */
mbed714	0:d616ece2d859	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
mbed714	0:d616ece2d859	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
mbed714	0:d616ece2d859	336	return (s8_t)ERR_MEM;
mbed714	0:d616ece2d859	337	}
mbed714	0:d616ece2d859	338
mbed714	0:d616ece2d859	339	/* b) choose the least destructive entry to recycle:
mbed714	0:d616ece2d859	340	* 1) empty entry
mbed714	0:d616ece2d859	341	* 2) oldest stable entry
mbed714	0:d616ece2d859	342	* 3) oldest pending entry without queued packets
mbed714	0:d616ece2d859	343	* 4) oldest pending entry with queued packets
mbed714	0:d616ece2d859	344	*
mbed714	0:d616ece2d859	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
mbed714	0:d616ece2d859	346	*/
mbed714	0:d616ece2d859	347
mbed714	0:d616ece2d859	348	/* 1) empty entry available? */
mbed714	0:d616ece2d859	349	if (empty < ARP_TABLE_SIZE) {
mbed714	0:d616ece2d859	350	i = empty;
mbed714	0:d616ece2d859	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
mbed714	0:d616ece2d859	352	} else {
mbed714	0:d616ece2d859	353	/* 2) found recyclable stable entry? */
mbed714	0:d616ece2d859	354	if (old_stable < ARP_TABLE_SIZE) {
mbed714	0:d616ece2d859	355	/* recycle oldest stable*/
mbed714	0:d616ece2d859	356	i = old_stable;
mbed714	0:d616ece2d859	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
mbed714	0:d616ece2d859	358	#if ARP_QUEUEING
mbed714	0:d616ece2d859	359	/* no queued packets should exist on stable entries */
mbed714	0:d616ece2d859	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
mbed714	0:d616ece2d859	361	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	362	/* 3) found recyclable pending entry without queued packets? */
mbed714	0:d616ece2d859	363	} else if (old_pending < ARP_TABLE_SIZE) {
mbed714	0:d616ece2d859	364	/* recycle oldest pending */
mbed714	0:d616ece2d859	365	i = old_pending;
mbed714	0:d616ece2d859	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
mbed714	0:d616ece2d859	367	#if ARP_QUEUEING
mbed714	0:d616ece2d859	368	/* 4) found recyclable pending entry with queued packets? */
mbed714	0:d616ece2d859	369	} else if (old_queue < ARP_TABLE_SIZE) {
mbed714	0:d616ece2d859	370	/* recycle oldest pending (queued packets are free in free_entry) */
mbed714	0:d616ece2d859	371	i = old_queue;
mbed714	0:d616ece2d859	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)));
mbed714	0:d616ece2d859	373	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	374	/* no empty or recyclable entries found */
mbed714	0:d616ece2d859	375	} else {
mbed714	0:d616ece2d859	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
mbed714	0:d616ece2d859	377	return (s8_t)ERR_MEM;
mbed714	0:d616ece2d859	378	}
mbed714	0:d616ece2d859	379
mbed714	0:d616ece2d859	380	/* { empty or recyclable entry found } */
mbed714	0:d616ece2d859	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
mbed714	0:d616ece2d859	382	free_entry(i);
mbed714	0:d616ece2d859	383	}
mbed714	0:d616ece2d859	384
mbed714	0:d616ece2d859	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
mbed714	0:d616ece2d859	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
mbed714	0:d616ece2d859	387	arp_table[i].state == ETHARP_STATE_EMPTY);
mbed714	0:d616ece2d859	388
mbed714	0:d616ece2d859	389	/* IP address given? */
mbed714	0:d616ece2d859	390	if (ipaddr != NULL) {
mbed714	0:d616ece2d859	391	/* set IP address */
mbed714	0:d616ece2d859	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
mbed714	0:d616ece2d859	393	}
mbed714	0:d616ece2d859	394	arp_table[i].ctime = 0;
mbed714	0:d616ece2d859	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	396	arp_table[i].static_entry = 0;
mbed714	0:d616ece2d859	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	398	return (err_t)i;
mbed714	0:d616ece2d859	399	}
mbed714	0:d616ece2d859	400
mbed714	0:d616ece2d859	401	/**
mbed714	0:d616ece2d859	402	* Send an IP packet on the network using netif->linkoutput
mbed714	0:d616ece2d859	403	* The ethernet header is filled in before sending.
mbed714	0:d616ece2d859	404	*
mbed714	0:d616ece2d859	405	* @params netif the lwIP network interface on which to send the packet
mbed714	0:d616ece2d859	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
mbed714	0:d616ece2d859	407	* @params src the source MAC address to be copied into the ethernet header
mbed714	0:d616ece2d859	408	* @params dst the destination MAC address to be copied into the ethernet header
mbed714	0:d616ece2d859	409	* @return ERR_OK if the packet was sent, any other err_t on failure
mbed714	0:d616ece2d859	410	*/
mbed714	0:d616ece2d859	411	static err_t
mbed714	0:d616ece2d859	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
mbed714	0:d616ece2d859	413	{
mbed714	0:d616ece2d859	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
mbed714	0:d616ece2d859	415
mbed714	0:d616ece2d859	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
mbed714	0:d616ece2d859	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
mbed714	0:d616ece2d859	418	ETHADDR32_COPY(&ethhdr->dest, dst);
mbed714	0:d616ece2d859	419	ETHADDR16_COPY(&ethhdr->src, src);
mbed714	0:d616ece2d859	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
mbed714	0:d616ece2d859	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
mbed714	0:d616ece2d859	422	/* send the packet */
mbed714	0:d616ece2d859	423	return netif->linkoutput(netif, p);
mbed714	0:d616ece2d859	424	}
mbed714	0:d616ece2d859	425
mbed714	0:d616ece2d859	426	/**
mbed714	0:d616ece2d859	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
mbed714	0:d616ece2d859	428	*
mbed714	0:d616ece2d859	429	* If a pending entry is resolved, any queued packets will be sent
mbed714	0:d616ece2d859	430	* at this point.
mbed714	0:d616ece2d859	431	*
mbed714	0:d616ece2d859	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
mbed714	0:d616ece2d859	433	* @param ipaddr IP address of the inserted ARP entry.
mbed714	0:d616ece2d859	434	* @param ethaddr Ethernet address of the inserted ARP entry.
mbed714	0:d616ece2d859	435	* @param flags @see definition of ETHARP_FLAG_*
mbed714	0:d616ece2d859	436	*
mbed714	0:d616ece2d859	437	* @return
mbed714	0:d616ece2d859	438	* - ERR_OK Succesfully updated ARP cache.
mbed714	0:d616ece2d859	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
mbed714	0:d616ece2d859	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
mbed714	0:d616ece2d859	441	*
mbed714	0:d616ece2d859	442	* @see pbuf_free()
mbed714	0:d616ece2d859	443	*/
mbed714	0:d616ece2d859	444	static err_t
mbed714	0:d616ece2d859	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
mbed714	0:d616ece2d859	446	{
mbed714	0:d616ece2d859	447	s8_t i;
mbed714	0:d616ece2d859	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
mbed714	0:d616ece2d859	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",
mbed714	0:d616ece2d859	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
mbed714	0:d616ece2d859	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
mbed714	0:d616ece2d859	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
mbed714	0:d616ece2d859	453	/* non-unicast address? */
mbed714	0:d616ece2d859	454	if (ip_addr_isany(ipaddr) \|\|
mbed714	0:d616ece2d859	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
mbed714	0:d616ece2d859	456	ip_addr_ismulticast(ipaddr)) {
mbed714	0:d616ece2d859	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
mbed714	0:d616ece2d859	458	return ERR_ARG;
mbed714	0:d616ece2d859	459	}
mbed714	0:d616ece2d859	460	/* find or create ARP entry */
mbed714	0:d616ece2d859	461	i = find_entry(ipaddr, flags);
mbed714	0:d616ece2d859	462	/* bail out if no entry could be found */
mbed714	0:d616ece2d859	463	if (i < 0) {
mbed714	0:d616ece2d859	464	return (err_t)i;
mbed714	0:d616ece2d859	465	}
mbed714	0:d616ece2d859	466
mbed714	0:d616ece2d859	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
mbed714	0:d616ece2d859	469	/* record static type */
mbed714	0:d616ece2d859	470	arp_table[i].static_entry = 1;
mbed714	0:d616ece2d859	471	}
mbed714	0:d616ece2d859	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	473
mbed714	0:d616ece2d859	474	/* mark it stable */
mbed714	0:d616ece2d859	475	arp_table[i].state = ETHARP_STATE_STABLE;
mbed714	0:d616ece2d859	476
mbed714	0:d616ece2d859	477	#if LWIP_SNMP
mbed714	0:d616ece2d859	478	/* record network interface */
mbed714	0:d616ece2d859	479	arp_table[i].netif = netif;
mbed714	0:d616ece2d859	480	#endif /* LWIP_SNMP */
mbed714	0:d616ece2d859	481	/* insert in SNMP ARP index tree */
mbed714	0:d616ece2d859	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
mbed714	0:d616ece2d859	483
mbed714	0:d616ece2d859	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
mbed714	0:d616ece2d859	485	/* update address */
mbed714	0:d616ece2d859	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
mbed714	0:d616ece2d859	487	/* reset time stamp */
mbed714	0:d616ece2d859	488	arp_table[i].ctime = 0;
mbed714	0:d616ece2d859	489	#if ARP_QUEUEING
mbed714	0:d616ece2d859	490	/* this is where we will send out queued packets! */
mbed714	0:d616ece2d859	491	while (arp_table[i].q != NULL) {
mbed714	0:d616ece2d859	492	struct pbuf *p;
mbed714	0:d616ece2d859	493	/* remember remainder of queue */
mbed714	0:d616ece2d859	494	struct etharp_q_entry *q = arp_table[i].q;
mbed714	0:d616ece2d859	495	/* pop first item off the queue */
mbed714	0:d616ece2d859	496	arp_table[i].q = q->next;
mbed714	0:d616ece2d859	497	/* get the packet pointer */
mbed714	0:d616ece2d859	498	p = q->p;
mbed714	0:d616ece2d859	499	/* now queue entry can be freed */
mbed714	0:d616ece2d859	500	memp_free(MEMP_ARP_QUEUE, q);
mbed714	0:d616ece2d859	501	/* send the queued IP packet */
mbed714	0:d616ece2d859	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
mbed714	0:d616ece2d859	503	/* free the queued IP packet */
mbed714	0:d616ece2d859	504	pbuf_free(p);
mbed714	0:d616ece2d859	505	}
mbed714	0:d616ece2d859	506	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	507	return ERR_OK;
mbed714	0:d616ece2d859	508	}
mbed714	0:d616ece2d859	509
mbed714	0:d616ece2d859	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
mbed714	0:d616ece2d859	511	/** Add a new static entry to the ARP table. If an entry exists for the
mbed714	0:d616ece2d859	512	* specified IP address, this entry is overwritten.
mbed714	0:d616ece2d859	513	* If packets are queued for the specified IP address, they are sent out.
mbed714	0:d616ece2d859	514	*
mbed714	0:d616ece2d859	515	* @param ipaddr IP address for the new static entry
mbed714	0:d616ece2d859	516	* @param ethaddr ethernet address for the new static entry
mbed714	0:d616ece2d859	517	* @return @see return values of etharp_add_static_entry
mbed714	0:d616ece2d859	518	*/
mbed714	0:d616ece2d859	519	err_t
mbed714	0:d616ece2d859	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
mbed714	0:d616ece2d859	521	{
mbed714	0:d616ece2d859	522	struct netif *netif;
mbed714	0:d616ece2d859	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",
mbed714	0:d616ece2d859	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
mbed714	0:d616ece2d859	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
mbed714	0:d616ece2d859	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
mbed714	0:d616ece2d859	527
mbed714	0:d616ece2d859	528	netif = ip_route(ipaddr);
mbed714	0:d616ece2d859	529	if (netif == NULL) {
mbed714	0:d616ece2d859	530	return ERR_RTE;
mbed714	0:d616ece2d859	531	}
mbed714	0:d616ece2d859	532
mbed714	0:d616ece2d859	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
mbed714	0:d616ece2d859	534	}
mbed714	0:d616ece2d859	535
mbed714	0:d616ece2d859	536	/** Remove a static entry from the ARP table previously added with a call to
mbed714	0:d616ece2d859	537	* etharp_add_static_entry.
mbed714	0:d616ece2d859	538	*
mbed714	0:d616ece2d859	539	* @param ipaddr IP address of the static entry to remove
mbed714	0:d616ece2d859	540	* @return ERR_OK: entry removed
mbed714	0:d616ece2d859	541	* ERR_MEM: entry wasn't found
mbed714	0:d616ece2d859	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
mbed714	0:d616ece2d859	543	*/
mbed714	0:d616ece2d859	544	err_t
mbed714	0:d616ece2d859	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
mbed714	0:d616ece2d859	546	{
mbed714	0:d616ece2d859	547	s8_t i;
mbed714	0:d616ece2d859	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed714	0:d616ece2d859	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
mbed714	0:d616ece2d859	550
mbed714	0:d616ece2d859	551	/* find or create ARP entry */
mbed714	0:d616ece2d859	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
mbed714	0:d616ece2d859	553	/* bail out if no entry could be found */
mbed714	0:d616ece2d859	554	if (i < 0) {
mbed714	0:d616ece2d859	555	return (err_t)i;
mbed714	0:d616ece2d859	556	}
mbed714	0:d616ece2d859	557
mbed714	0:d616ece2d859	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
mbed714	0:d616ece2d859	559	(arp_table[i].static_entry == 0)) {
mbed714	0:d616ece2d859	560	/* entry wasn't a static entry, cannot remove it */
mbed714	0:d616ece2d859	561	return ERR_ARG;
mbed714	0:d616ece2d859	562	}
mbed714	0:d616ece2d859	563	/* entry found, free it */
mbed714	0:d616ece2d859	564	free_entry(i);
mbed714	0:d616ece2d859	565	return ERR_OK;
mbed714	0:d616ece2d859	566	}
mbed714	0:d616ece2d859	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mbed714	0:d616ece2d859	568
mbed714	0:d616ece2d859	569	/**
mbed714	0:d616ece2d859	570	* Finds (stable) ethernet/IP address pair from ARP table
mbed714	0:d616ece2d859	571	* using interface and IP address index.
mbed714	0:d616ece2d859	572	* @note the addresses in the ARP table are in network order!
mbed714	0:d616ece2d859	573	*
mbed714	0:d616ece2d859	574	* @param netif points to interface index
mbed714	0:d616ece2d859	575	* @param ipaddr points to the (network order) IP address index
mbed714	0:d616ece2d859	576	* @param eth_ret points to return pointer
mbed714	0:d616ece2d859	577	* @param ip_ret points to return pointer
mbed714	0:d616ece2d859	578	* @return table index if found, -1 otherwise
mbed714	0:d616ece2d859	579	*/
mbed714	0:d616ece2d859	580	s8_t
mbed714	0:d616ece2d859	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
mbed714	0:d616ece2d859	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
mbed714	0:d616ece2d859	583	{
mbed714	0:d616ece2d859	584	s8_t i;
mbed714	0:d616ece2d859	585
mbed714	0:d616ece2d859	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
mbed714	0:d616ece2d859	587	eth_ret != NULL && ip_ret != NULL);
mbed714	0:d616ece2d859	588
mbed714	0:d616ece2d859	589	LWIP_UNUSED_ARG(netif);
mbed714	0:d616ece2d859	590
mbed714	0:d616ece2d859	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
mbed714	0:d616ece2d859	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
mbed714	0:d616ece2d859	593	*eth_ret = &arp_table[i].ethaddr;
mbed714	0:d616ece2d859	594	*ip_ret = &arp_table[i].ipaddr;
mbed714	0:d616ece2d859	595	return i;
mbed714	0:d616ece2d859	596	}
mbed714	0:d616ece2d859	597	return -1;
mbed714	0:d616ece2d859	598	}
mbed714	0:d616ece2d859	599
mbed714	0:d616ece2d859	600	#if ETHARP_TRUST_IP_MAC
mbed714	0:d616ece2d859	601	/**
mbed714	0:d616ece2d859	602	* Updates the ARP table using the given IP packet.
mbed714	0:d616ece2d859	603	*
mbed714	0:d616ece2d859	604	* Uses the incoming IP packet's source address to update the
mbed714	0:d616ece2d859	605	* ARP cache for the local network. The function does not alter
mbed714	0:d616ece2d859	606	* or free the packet. This function must be called before the
mbed714	0:d616ece2d859	607	* packet p is passed to the IP layer.
mbed714	0:d616ece2d859	608	*
mbed714	0:d616ece2d859	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
mbed714	0:d616ece2d859	610	* @param p The IP packet that arrived on netif.
mbed714	0:d616ece2d859	611	*
mbed714	0:d616ece2d859	612	* @return NULL
mbed714	0:d616ece2d859	613	*
mbed714	0:d616ece2d859	614	* @see pbuf_free()
mbed714	0:d616ece2d859	615	*/
mbed714	0:d616ece2d859	616	static void
mbed714	0:d616ece2d859	617	etharp_ip_input(struct netif netif, struct pbuf p)
mbed714	0:d616ece2d859	618	{
mbed714	0:d616ece2d859	619	struct eth_hdr *ethhdr;
mbed714	0:d616ece2d859	620	struct ip_hdr *iphdr;
mbed714	0:d616ece2d859	621	ip_addr_t iphdr_src;
mbed714	0:d616ece2d859	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
mbed714	0:d616ece2d859	623
mbed714	0:d616ece2d859	624	/* Only insert an entry if the source IP address of the
mbed714	0:d616ece2d859	625	incoming IP packet comes from a host on the local network. */
mbed714	0:d616ece2d859	626	ethhdr = (struct eth_hdr *)p->payload;
mbed714	0:d616ece2d859	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
mbed714	0:d616ece2d859	628	#if ETHARP_SUPPORT_VLAN
mbed714	0:d616ece2d859	629	if (ethhdr->type == ETHTYPE_VLAN) {
mbed714	0:d616ece2d859	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
mbed714	0:d616ece2d859	631	}
mbed714	0:d616ece2d859	632	#endif /* ETHARP_SUPPORT_VLAN */
mbed714	0:d616ece2d859	633
mbed714	0:d616ece2d859	634	ip_addr_copy(iphdr_src, iphdr->src);
mbed714	0:d616ece2d859	635
mbed714	0:d616ece2d859	636	/* source is not on the local network? */
mbed714	0:d616ece2d859	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
mbed714	0:d616ece2d859	638	/* do nothing */
mbed714	0:d616ece2d859	639	return;
mbed714	0:d616ece2d859	640	}
mbed714	0:d616ece2d859	641
mbed714	0:d616ece2d859	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
mbed714	0:d616ece2d859	643	/* update the source IP address in the cache, if present */
mbed714	0:d616ece2d859	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
mbed714	0:d616ece2d859	645	* back soon (for example, if the destination IP address is ours. */
mbed714	0:d616ece2d859	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
mbed714	0:d616ece2d859	647	}
mbed714	0:d616ece2d859	648	#endif /* ETHARP_TRUST_IP_MAC */
mbed714	0:d616ece2d859	649
mbed714	0:d616ece2d859	650	/**
mbed714	0:d616ece2d859	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
mbed714	0:d616ece2d859	652	* send out queued IP packets. Updates cache with snooped address pairs.
mbed714	0:d616ece2d859	653	*
mbed714	0:d616ece2d859	654	* Should be called for incoming ARP packets. The pbuf in the argument
mbed714	0:d616ece2d859	655	* is freed by this function.
mbed714	0:d616ece2d859	656	*
mbed714	0:d616ece2d859	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
mbed714	0:d616ece2d859	658	* @param ethaddr Ethernet address of netif.
mbed714	0:d616ece2d859	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
mbed714	0:d616ece2d859	660	*
mbed714	0:d616ece2d859	661	* @return NULL
mbed714	0:d616ece2d859	662	*
mbed714	0:d616ece2d859	663	* @see pbuf_free()
mbed714	0:d616ece2d859	664	*/
mbed714	0:d616ece2d859	665	static void
mbed714	0:d616ece2d859	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
mbed714	0:d616ece2d859	667	{
mbed714	0:d616ece2d859	668	struct etharp_hdr *hdr;
mbed714	0:d616ece2d859	669	struct eth_hdr *ethhdr;
mbed714	0:d616ece2d859	670	/* these are aligned properly, whereas the ARP header fields might not be */
mbed714	0:d616ece2d859	671	ip_addr_t sipaddr, dipaddr;
mbed714	0:d616ece2d859	672	u8_t for_us;
mbed714	0:d616ece2d859	673	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	674	const u8_t * ethdst_hwaddr;
mbed714	0:d616ece2d859	675	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	676
mbed714	0:d616ece2d859	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
mbed714	0:d616ece2d859	678
mbed714	0:d616ece2d859	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
mbed714	0:d616ece2d859	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
mbed714	0:d616ece2d859	681	if (p->len < SIZEOF_ETHARP_PACKET) {
mbed714	0:d616ece2d859	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
mbed714	0:d616ece2d859	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
mbed714	0:d616ece2d859	684	(s16_t)SIZEOF_ETHARP_PACKET));
mbed714	0:d616ece2d859	685	ETHARP_STATS_INC(etharp.lenerr);
mbed714	0:d616ece2d859	686	ETHARP_STATS_INC(etharp.drop);
mbed714	0:d616ece2d859	687	pbuf_free(p);
mbed714	0:d616ece2d859	688	return;
mbed714	0:d616ece2d859	689	}
mbed714	0:d616ece2d859	690
mbed714	0:d616ece2d859	691	ethhdr = (struct eth_hdr *)p->payload;
mbed714	0:d616ece2d859	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
mbed714	0:d616ece2d859	693	#if ETHARP_SUPPORT_VLAN
mbed714	0:d616ece2d859	694	if (ethhdr->type == ETHTYPE_VLAN) {
mbed714	0:d616ece2d859	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
mbed714	0:d616ece2d859	696	}
mbed714	0:d616ece2d859	697	#endif /* ETHARP_SUPPORT_VLAN */
mbed714	0:d616ece2d859	698
mbed714	0:d616ece2d859	699	/* RFC 826 "Packet Reception": */
mbed714	0:d616ece2d859	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
mbed714	0:d616ece2d859	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
mbed714	0:d616ece2d859	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
mbed714	0:d616ece2d859	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
mbed714	0:d616ece2d859	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
mbed714	0:d616ece2d859	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
mbed714	0:d616ece2d859	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",
mbed714	0:d616ece2d859	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
mbed714	0:d616ece2d859	708	ETHARP_STATS_INC(etharp.proterr);
mbed714	0:d616ece2d859	709	ETHARP_STATS_INC(etharp.drop);
mbed714	0:d616ece2d859	710	pbuf_free(p);
mbed714	0:d616ece2d859	711	return;
mbed714	0:d616ece2d859	712	}
mbed714	0:d616ece2d859	713	ETHARP_STATS_INC(etharp.recv);
mbed714	0:d616ece2d859	714
mbed714	0:d616ece2d859	715	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	716	/* We have to check if a host already has configured our random
mbed714	0:d616ece2d859	717	* created link local address and continously check if there is
mbed714	0:d616ece2d859	718	* a host with this IP-address so we can detect collisions */
mbed714	0:d616ece2d859	719	autoip_arp_reply(netif, hdr);
mbed714	0:d616ece2d859	720	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	721
mbed714	0:d616ece2d859	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
mbed714	0:d616ece2d859	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
mbed714	0:d616ece2d859	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
mbed714	0:d616ece2d859	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
mbed714	0:d616ece2d859	726
mbed714	0:d616ece2d859	727	/* this interface is not configured? */
mbed714	0:d616ece2d859	728	if (ip_addr_isany(&netif->ip_addr)) {
mbed714	0:d616ece2d859	729	for_us = 0;
mbed714	0:d616ece2d859	730	} else {
mbed714	0:d616ece2d859	731	/* ARP packet directed to us? */
mbed714	0:d616ece2d859	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
mbed714	0:d616ece2d859	733	}
mbed714	0:d616ece2d859	734
mbed714	0:d616ece2d859	735	/* ARP message directed to us?
mbed714	0:d616ece2d859	736	-> add IP address in ARP cache; assume requester wants to talk to us,
mbed714	0:d616ece2d859	737	can result in directly sending the queued packets for this host.
mbed714	0:d616ece2d859	738	ARP message not directed to us?
mbed714	0:d616ece2d859	739	-> update the source IP address in the cache, if present */
mbed714	0:d616ece2d859	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
mbed714	0:d616ece2d859	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
mbed714	0:d616ece2d859	742
mbed714	0:d616ece2d859	743	/* now act on the message itself */
mbed714	0:d616ece2d859	744	switch (hdr->opcode) {
mbed714	0:d616ece2d859	745	/* ARP request? */
mbed714	0:d616ece2d859	746	case PP_HTONS(ARP_REQUEST):
mbed714	0:d616ece2d859	747	/* ARP request. If it asked for our address, we send out a
mbed714	0:d616ece2d859	748	* reply. In any case, we time-stamp any existing ARP entry,
mbed714	0:d616ece2d859	749	* and possiby send out an IP packet that was queued on it. */
mbed714	0:d616ece2d859	750
mbed714	0:d616ece2d859	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
mbed714	0:d616ece2d859	752	/* ARP request for our address? */
mbed714	0:d616ece2d859	753	if (for_us) {
mbed714	0:d616ece2d859	754
mbed714	0:d616ece2d859	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
mbed714	0:d616ece2d859	756	/* Re-use pbuf to send ARP reply.
mbed714	0:d616ece2d859	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
mbed714	0:d616ece2d859	758	that would allocate a new pbuf. */
mbed714	0:d616ece2d859	759	hdr->opcode = htons(ARP_REPLY);
mbed714	0:d616ece2d859	760
mbed714	0:d616ece2d859	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
mbed714	0:d616ece2d859	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
mbed714	0:d616ece2d859	763
mbed714	0:d616ece2d859	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
mbed714	0:d616ece2d859	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
mbed714	0:d616ece2d859	766	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
mbed714	0:d616ece2d859	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
mbed714	0:d616ece2d859	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
mbed714	0:d616ece2d859	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
mbed714	0:d616ece2d859	771	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	772
mbed714	0:d616ece2d859	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
mbed714	0:d616ece2d859	774	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
mbed714	0:d616ece2d859	776	#else /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
mbed714	0:d616ece2d859	778	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
mbed714	0:d616ece2d859	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
mbed714	0:d616ece2d859	781
mbed714	0:d616ece2d859	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
mbed714	0:d616ece2d859	783	are already correct, we tested that before */
mbed714	0:d616ece2d859	784
mbed714	0:d616ece2d859	785	/* return ARP reply */
mbed714	0:d616ece2d859	786	netif->linkoutput(netif, p);
mbed714	0:d616ece2d859	787	/* we are not configured? */
mbed714	0:d616ece2d859	788	} else if (ip_addr_isany(&netif->ip_addr)) {
mbed714	0:d616ece2d859	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
mbed714	0:d616ece2d859	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
mbed714	0:d616ece2d859	791	/* request was not directed to us */
mbed714	0:d616ece2d859	792	} else {
mbed714	0:d616ece2d859	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
mbed714	0:d616ece2d859	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
mbed714	0:d616ece2d859	795	}
mbed714	0:d616ece2d859	796	break;
mbed714	0:d616ece2d859	797	case PP_HTONS(ARP_REPLY):
mbed714	0:d616ece2d859	798	/* ARP reply. We already updated the ARP cache earlier. */
mbed714	0:d616ece2d859	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
mbed714	0:d616ece2d859	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
mbed714	0:d616ece2d859	801	/* DHCP wants to know about ARP replies from any host with an
mbed714	0:d616ece2d859	802	* IP address also offered to us by the DHCP server. We do not
mbed714	0:d616ece2d859	803	* want to take a duplicate IP address on a single network.
mbed714	0:d616ece2d859	804	* @todo How should we handle redundant (fail-over) interfaces? */
mbed714	0:d616ece2d859	805	dhcp_arp_reply(netif, &sipaddr);
mbed714	0:d616ece2d859	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
mbed714	0:d616ece2d859	807	break;
mbed714	0:d616ece2d859	808	default:
mbed714	0:d616ece2d859	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
mbed714	0:d616ece2d859	810	ETHARP_STATS_INC(etharp.err);
mbed714	0:d616ece2d859	811	break;
mbed714	0:d616ece2d859	812	}
mbed714	0:d616ece2d859	813	/* free ARP packet */
mbed714	0:d616ece2d859	814	pbuf_free(p);
mbed714	0:d616ece2d859	815	}
mbed714	0:d616ece2d859	816
mbed714	0:d616ece2d859	817	/**
mbed714	0:d616ece2d859	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
mbed714	0:d616ece2d859	819	*
mbed714	0:d616ece2d859	820	* For IP multicast and broadcast, corresponding Ethernet addresses
mbed714	0:d616ece2d859	821	* are selected and the packet is transmitted on the link.
mbed714	0:d616ece2d859	822	*
mbed714	0:d616ece2d859	823	* For unicast addresses, the packet is submitted to etharp_query(). In
mbed714	0:d616ece2d859	824	* case the IP address is outside the local network, the IP address of
mbed714	0:d616ece2d859	825	* the gateway is used.
mbed714	0:d616ece2d859	826	*
mbed714	0:d616ece2d859	827	* @param netif The lwIP network interface which the IP packet will be sent on.
mbed714	0:d616ece2d859	828	* @param q The pbuf(s) containing the IP packet to be sent.
mbed714	0:d616ece2d859	829	* @param ipaddr The IP address of the packet destination.
mbed714	0:d616ece2d859	830	*
mbed714	0:d616ece2d859	831	* @return
mbed714	0:d616ece2d859	832	* - ERR_RTE No route to destination (no gateway to external networks),
mbed714	0:d616ece2d859	833	* or the return type of either etharp_query() or etharp_send_ip().
mbed714	0:d616ece2d859	834	*/
mbed714	0:d616ece2d859	835	err_t
mbed714	0:d616ece2d859	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
mbed714	0:d616ece2d859	837	{
mbed714	0:d616ece2d859	838	struct eth_addr *dest, mcastaddr;
mbed714	0:d616ece2d859	839
mbed714	0:d616ece2d859	840	/* make room for Ethernet header - should not fail */
mbed714	0:d616ece2d859	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
mbed714	0:d616ece2d859	842	/* bail out */
mbed714	0:d616ece2d859	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	844	("etharp_output: could not allocate room for header.\n"));
mbed714	0:d616ece2d859	845	LINK_STATS_INC(link.lenerr);
mbed714	0:d616ece2d859	846	return ERR_BUF;
mbed714	0:d616ece2d859	847	}
mbed714	0:d616ece2d859	848
mbed714	0:d616ece2d859	849	/* assume unresolved Ethernet address */
mbed714	0:d616ece2d859	850	dest = NULL;
mbed714	0:d616ece2d859	851	/* Determine on destination hardware address. Broadcasts and multicasts
mbed714	0:d616ece2d859	852	* are special, other IP addresses are looked up in the ARP table. */
mbed714	0:d616ece2d859	853
mbed714	0:d616ece2d859	854	/* broadcast destination IP address? */
mbed714	0:d616ece2d859	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
mbed714	0:d616ece2d859	856	/* broadcast on Ethernet also */
mbed714	0:d616ece2d859	857	dest = (struct eth_addr *)&ethbroadcast;
mbed714	0:d616ece2d859	858	/* multicast destination IP address? */
mbed714	0:d616ece2d859	859	} else if (ip_addr_ismulticast(ipaddr)) {
mbed714	0:d616ece2d859	860	/* Hash IP multicast address to MAC address.*/
mbed714	0:d616ece2d859	861	mcastaddr.addr[0] = 0x01;
mbed714	0:d616ece2d859	862	mcastaddr.addr[1] = 0x00;
mbed714	0:d616ece2d859	863	mcastaddr.addr[2] = 0x5e;
mbed714	0:d616ece2d859	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
mbed714	0:d616ece2d859	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
mbed714	0:d616ece2d859	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
mbed714	0:d616ece2d859	867	/* destination Ethernet address is multicast */
mbed714	0:d616ece2d859	868	dest = &mcastaddr;
mbed714	0:d616ece2d859	869	/* unicast destination IP address? */
mbed714	0:d616ece2d859	870	} else {
mbed714	0:d616ece2d859	871	/* outside local network? */
mbed714	0:d616ece2d859	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
mbed714	0:d616ece2d859	873	!ip_addr_islinklocal(ipaddr)) {
mbed714	0:d616ece2d859	874	/* interface has default gateway? */
mbed714	0:d616ece2d859	875	if (!ip_addr_isany(&netif->gw)) {
mbed714	0:d616ece2d859	876	/* send to hardware address of default gateway IP address */
mbed714	0:d616ece2d859	877	ipaddr = &(netif->gw);
mbed714	0:d616ece2d859	878	/* no default gateway available */
mbed714	0:d616ece2d859	879	} else {
mbed714	0:d616ece2d859	880	/* no route to destination error (default gateway missing) */
mbed714	0:d616ece2d859	881	return ERR_RTE;
mbed714	0:d616ece2d859	882	}
mbed714	0:d616ece2d859	883	}
mbed714	0:d616ece2d859	884	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	885	if (netif->addr_hint != NULL) {
mbed714	0:d616ece2d859	886	/* per-pcb cached entry was given */
mbed714	0:d616ece2d859	887	u8_t etharp_cached_entry = *(netif->addr_hint);
mbed714	0:d616ece2d859	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
mbed714	0:d616ece2d859	889	#endif /* LWIP_NETIF_HWADDRHINT */
mbed714	0:d616ece2d859	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
mbed714	0:d616ece2d859	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
mbed714	0:d616ece2d859	892	/* the per-pcb-cached entry is stable and the right one! */
mbed714	0:d616ece2d859	893	ETHARP_STATS_INC(etharp.cachehit);
mbed714	0:d616ece2d859	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
mbed714	0:d616ece2d859	895	&arp_table[etharp_cached_entry].ethaddr);
mbed714	0:d616ece2d859	896	}
mbed714	0:d616ece2d859	897	#if LWIP_NETIF_HWADDRHINT
mbed714	0:d616ece2d859	898	}
mbed714	0:d616ece2d859	899	}
mbed714	0:d616ece2d859	900	#endif /* LWIP_NETIF_HWADDRHINT */
mbed714	0:d616ece2d859	901	/* queue on destination Ethernet address belonging to ipaddr */
mbed714	0:d616ece2d859	902	return etharp_query(netif, ipaddr, q);
mbed714	0:d616ece2d859	903	}
mbed714	0:d616ece2d859	904
mbed714	0:d616ece2d859	905	/* continuation for multicast/broadcast destinations */
mbed714	0:d616ece2d859	906	/* obtain source Ethernet address of the given interface */
mbed714	0:d616ece2d859	907	/* send packet directly on the link */
mbed714	0:d616ece2d859	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
mbed714	0:d616ece2d859	909	}
mbed714	0:d616ece2d859	910
mbed714	0:d616ece2d859	911	/**
mbed714	0:d616ece2d859	912	* Send an ARP request for the given IP address and/or queue a packet.
mbed714	0:d616ece2d859	913	*
mbed714	0:d616ece2d859	914	* If the IP address was not yet in the cache, a pending ARP cache entry
mbed714	0:d616ece2d859	915	* is added and an ARP request is sent for the given address. The packet
mbed714	0:d616ece2d859	916	* is queued on this entry.
mbed714	0:d616ece2d859	917	*
mbed714	0:d616ece2d859	918	* If the IP address was already pending in the cache, a new ARP request
mbed714	0:d616ece2d859	919	* is sent for the given address. The packet is queued on this entry.
mbed714	0:d616ece2d859	920	*
mbed714	0:d616ece2d859	921	* If the IP address was already stable in the cache, and a packet is
mbed714	0:d616ece2d859	922	* given, it is directly sent and no ARP request is sent out.
mbed714	0:d616ece2d859	923	*
mbed714	0:d616ece2d859	924	* If the IP address was already stable in the cache, and no packet is
mbed714	0:d616ece2d859	925	* given, an ARP request is sent out.
mbed714	0:d616ece2d859	926	*
mbed714	0:d616ece2d859	927	* @param netif The lwIP network interface on which ipaddr
mbed714	0:d616ece2d859	928	* must be queried for.
mbed714	0:d616ece2d859	929	* @param ipaddr The IP address to be resolved.
mbed714	0:d616ece2d859	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
mbed714	0:d616ece2d859	931	* q is not freed by this function.
mbed714	0:d616ece2d859	932	*
mbed714	0:d616ece2d859	933	* @note q must only be ONE packet, not a packet queue!
mbed714	0:d616ece2d859	934	*
mbed714	0:d616ece2d859	935	* @return
mbed714	0:d616ece2d859	936	* - ERR_BUF Could not make room for Ethernet header.
mbed714	0:d616ece2d859	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
mbed714	0:d616ece2d859	938	* to query for address or queue the packet.
mbed714	0:d616ece2d859	939	* - ERR_MEM Could not queue packet due to memory shortage.
mbed714	0:d616ece2d859	940	* - ERR_RTE No route to destination (no gateway to external networks).
mbed714	0:d616ece2d859	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
mbed714	0:d616ece2d859	942	*
mbed714	0:d616ece2d859	943	*/
mbed714	0:d616ece2d859	944	err_t
mbed714	0:d616ece2d859	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
mbed714	0:d616ece2d859	946	{
mbed714	0:d616ece2d859	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
mbed714	0:d616ece2d859	948	err_t result = ERR_MEM;
mbed714	0:d616ece2d859	949	s8_t i; /* ARP entry index */
mbed714	0:d616ece2d859	950
mbed714	0:d616ece2d859	951	/* non-unicast address? */
mbed714	0:d616ece2d859	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
mbed714	0:d616ece2d859	953	ip_addr_ismulticast(ipaddr) \|\|
mbed714	0:d616ece2d859	954	ip_addr_isany(ipaddr)) {
mbed714	0:d616ece2d859	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
mbed714	0:d616ece2d859	956	return ERR_ARG;
mbed714	0:d616ece2d859	957	}
mbed714	0:d616ece2d859	958
mbed714	0:d616ece2d859	959	/* find entry in ARP cache, ask to create entry if queueing packet */
mbed714	0:d616ece2d859	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
mbed714	0:d616ece2d859	961
mbed714	0:d616ece2d859	962	/* could not find or create entry? */
mbed714	0:d616ece2d859	963	if (i < 0) {
mbed714	0:d616ece2d859	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
mbed714	0:d616ece2d859	965	if (q) {
mbed714	0:d616ece2d859	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
mbed714	0:d616ece2d859	967	ETHARP_STATS_INC(etharp.memerr);
mbed714	0:d616ece2d859	968	}
mbed714	0:d616ece2d859	969	return (err_t)i;
mbed714	0:d616ece2d859	970	}
mbed714	0:d616ece2d859	971
mbed714	0:d616ece2d859	972	/* mark a fresh entry as pending (we just sent a request) */
mbed714	0:d616ece2d859	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
mbed714	0:d616ece2d859	974	arp_table[i].state = ETHARP_STATE_PENDING;
mbed714	0:d616ece2d859	975	}
mbed714	0:d616ece2d859	976
mbed714	0:d616ece2d859	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
mbed714	0:d616ece2d859	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
mbed714	0:d616ece2d859	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
mbed714	0:d616ece2d859	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
mbed714	0:d616ece2d859	981
mbed714	0:d616ece2d859	982	/* do we have a pending entry? or an implicit query request? */
mbed714	0:d616ece2d859	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
mbed714	0:d616ece2d859	984	/* try to resolve it; send out ARP request */
mbed714	0:d616ece2d859	985	result = etharp_request(netif, ipaddr);
mbed714	0:d616ece2d859	986	if (result != ERR_OK) {
mbed714	0:d616ece2d859	987	/* ARP request couldn't be sent */
mbed714	0:d616ece2d859	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
mbed714	0:d616ece2d859	989	since this failure could be temporary, and the next packet calling
mbed714	0:d616ece2d859	990	etharp_query again could lead to sending the queued packets. */
mbed714	0:d616ece2d859	991	}
mbed714	0:d616ece2d859	992	if (q == NULL) {
mbed714	0:d616ece2d859	993	return result;
mbed714	0:d616ece2d859	994	}
mbed714	0:d616ece2d859	995	}
mbed714	0:d616ece2d859	996
mbed714	0:d616ece2d859	997	/* packet given? */
mbed714	0:d616ece2d859	998	LWIP_ASSERT("q != NULL", q != NULL);
mbed714	0:d616ece2d859	999	/* stable entry? */
mbed714	0:d616ece2d859	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
mbed714	0:d616ece2d859	1001	/* we have a valid IP->Ethernet address mapping */
mbed714	0:d616ece2d859	1002	ETHARP_SET_HINT(netif, i);
mbed714	0:d616ece2d859	1003	/* send the packet */
mbed714	0:d616ece2d859	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
mbed714	0:d616ece2d859	1005	/* pending entry? (either just created or already pending */
mbed714	0:d616ece2d859	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
mbed714	0:d616ece2d859	1007	#if ARP_QUEUEING /* queue the given q packet */
mbed714	0:d616ece2d859	1008	struct pbuf *p;
mbed714	0:d616ece2d859	1009	int copy_needed = 0;
mbed714	0:d616ece2d859	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
mbed714	0:d616ece2d859	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
mbed714	0:d616ece2d859	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
mbed714	0:d616ece2d859	1013	p = q;
mbed714	0:d616ece2d859	1014	while (p) {
mbed714	0:d616ece2d859	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
mbed714	0:d616ece2d859	1016	if(p->type != PBUF_ROM) {
mbed714	0:d616ece2d859	1017	copy_needed = 1;
mbed714	0:d616ece2d859	1018	break;
mbed714	0:d616ece2d859	1019	}
mbed714	0:d616ece2d859	1020	p = p->next;
mbed714	0:d616ece2d859	1021	}
mbed714	0:d616ece2d859	1022	if(copy_needed) {
mbed714	0:d616ece2d859	1023	/* copy the whole packet into new pbufs */
mbed714	0:d616ece2d859	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
mbed714	0:d616ece2d859	1025	if(p != NULL) {
mbed714	0:d616ece2d859	1026	if (pbuf_copy(p, q) != ERR_OK) {
mbed714	0:d616ece2d859	1027	pbuf_free(p);
mbed714	0:d616ece2d859	1028	p = NULL;
mbed714	0:d616ece2d859	1029	}
mbed714	0:d616ece2d859	1030	}
mbed714	0:d616ece2d859	1031	} else {
mbed714	0:d616ece2d859	1032	/* referencing the old pbuf is enough */
mbed714	0:d616ece2d859	1033	p = q;
mbed714	0:d616ece2d859	1034	pbuf_ref(p);
mbed714	0:d616ece2d859	1035	}
mbed714	0:d616ece2d859	1036	/* packet could be taken over? */
mbed714	0:d616ece2d859	1037	if (p != NULL) {
mbed714	0:d616ece2d859	1038	/* queue packet ... */
mbed714	0:d616ece2d859	1039	struct etharp_q_entry *new_entry;
mbed714	0:d616ece2d859	1040	/* allocate a new arp queue entry */
mbed714	0:d616ece2d859	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
mbed714	0:d616ece2d859	1042	if (new_entry != NULL) {
mbed714	0:d616ece2d859	1043	new_entry->next = 0;
mbed714	0:d616ece2d859	1044	new_entry->p = p;
mbed714	0:d616ece2d859	1045	if(arp_table[i].q != NULL) {
mbed714	0:d616ece2d859	1046	/* queue was already existent, append the new entry to the end */
mbed714	0:d616ece2d859	1047	struct etharp_q_entry *r;
mbed714	0:d616ece2d859	1048	r = arp_table[i].q;
mbed714	0:d616ece2d859	1049	while (r->next != NULL) {
mbed714	0:d616ece2d859	1050	r = r->next;
mbed714	0:d616ece2d859	1051	}
mbed714	0:d616ece2d859	1052	r->next = new_entry;
mbed714	0:d616ece2d859	1053	} else {
mbed714	0:d616ece2d859	1054	/* queue did not exist, first item in queue */
mbed714	0:d616ece2d859	1055	arp_table[i].q = new_entry;
mbed714	0:d616ece2d859	1056	}
mbed714	0:d616ece2d859	1057	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
mbed714	0:d616ece2d859	1058	result = ERR_OK;
mbed714	0:d616ece2d859	1059	} else {
mbed714	0:d616ece2d859	1060	/* the pool MEMP_ARP_QUEUE is empty */
mbed714	0:d616ece2d859	1061	pbuf_free(p);
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	1063	/* { result == ERR_MEM } through initialization */
mbed714	0:d616ece2d859	1064	}
mbed714	0:d616ece2d859	1065	} else {
mbed714	0:d616ece2d859	1066	ETHARP_STATS_INC(etharp.memerr);
mbed714	0:d616ece2d859	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));
mbed714	0:d616ece2d859	1068	/* { result == ERR_MEM } through initialization */
mbed714	0:d616ece2d859	1069	}
mbed714	0:d616ece2d859	1070	#else /* ARP_QUEUEING */
mbed714	0:d616ece2d859	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
mbed714	0:d616ece2d859	1072	/* { result == ERR_MEM } through initialization */
mbed714	0:d616ece2d859	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
mbed714	0:d616ece2d859	1074	#endif /* ARP_QUEUEING */
mbed714	0:d616ece2d859	1075	}
mbed714	0:d616ece2d859	1076	return result;
mbed714	0:d616ece2d859	1077	}
mbed714	0:d616ece2d859	1078
mbed714	0:d616ece2d859	1079	/**
mbed714	0:d616ece2d859	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
mbed714	0:d616ece2d859	1081	*
mbed714	0:d616ece2d859	1082	* @param netif the lwip network interface on which to send the ARP packet
mbed714	0:d616ece2d859	1083	* @param ethsrc_addr the source MAC address for the ethernet header
mbed714	0:d616ece2d859	1084	* @param ethdst_addr the destination MAC address for the ethernet header
mbed714	0:d616ece2d859	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
mbed714	0:d616ece2d859	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
mbed714	0:d616ece2d859	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
mbed714	0:d616ece2d859	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
mbed714	0:d616ece2d859	1089	* @param opcode the type of the ARP packet
mbed714	0:d616ece2d859	1090	* @return ERR_OK if the ARP packet has been sent
mbed714	0:d616ece2d859	1091	* ERR_MEM if the ARP packet couldn't be allocated
mbed714	0:d616ece2d859	1092	* any other err_t on failure
mbed714	0:d616ece2d859	1093	*/
mbed714	0:d616ece2d859	1094	#if !LWIP_AUTOIP
mbed714	0:d616ece2d859	1095	static
mbed714	0:d616ece2d859	1096	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	1097	err_t
mbed714	0:d616ece2d859	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
mbed714	0:d616ece2d859	1099	const struct eth_addr *ethdst_addr,
mbed714	0:d616ece2d859	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
mbed714	0:d616ece2d859	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
mbed714	0:d616ece2d859	1102	const u16_t opcode)
mbed714	0:d616ece2d859	1103	{
mbed714	0:d616ece2d859	1104	struct pbuf *p;
mbed714	0:d616ece2d859	1105	err_t result = ERR_OK;
mbed714	0:d616ece2d859	1106	struct eth_hdr *ethhdr;
mbed714	0:d616ece2d859	1107	struct etharp_hdr *hdr;
mbed714	0:d616ece2d859	1108	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	1109	const u8_t * ethdst_hwaddr;
mbed714	0:d616ece2d859	1110	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	1111
mbed714	0:d616ece2d859	1112	/* allocate a pbuf for the outgoing ARP request packet */
mbed714	0:d616ece2d859	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
mbed714	0:d616ece2d859	1114	/* could allocate a pbuf for an ARP request? */
mbed714	0:d616ece2d859	1115	if (p == NULL) {
mbed714	0:d616ece2d859	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mbed714	0:d616ece2d859	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
mbed714	0:d616ece2d859	1118	ETHARP_STATS_INC(etharp.memerr);
mbed714	0:d616ece2d859	1119	return ERR_MEM;
mbed714	0:d616ece2d859	1120	}
mbed714	0:d616ece2d859	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
mbed714	0:d616ece2d859	1122	(p->len >= SIZEOF_ETHARP_PACKET));
mbed714	0:d616ece2d859	1123
mbed714	0:d616ece2d859	1124	ethhdr = (struct eth_hdr *)p->payload;
mbed714	0:d616ece2d859	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
mbed714	0:d616ece2d859	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
mbed714	0:d616ece2d859	1127	hdr->opcode = htons(opcode);
mbed714	0:d616ece2d859	1128
mbed714	0:d616ece2d859	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
mbed714	0:d616ece2d859	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
mbed714	0:d616ece2d859	1131	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
mbed714	0:d616ece2d859	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
mbed714	0:d616ece2d859	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
mbed714	0:d616ece2d859	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
mbed714	0:d616ece2d859	1136	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	1137	/* Write the ARP MAC-Addresses */
mbed714	0:d616ece2d859	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
mbed714	0:d616ece2d859	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
mbed714	0:d616ece2d859	1140	/* Write the Ethernet MAC-Addresses */
mbed714	0:d616ece2d859	1141	#if LWIP_AUTOIP
mbed714	0:d616ece2d859	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
mbed714	0:d616ece2d859	1143	#else /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
mbed714	0:d616ece2d859	1145	#endif /* LWIP_AUTOIP */
mbed714	0:d616ece2d859	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
mbed714	0:d616ece2d859	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
mbed714	0:d616ece2d859	1148	* structure packing. */
mbed714	0:d616ece2d859	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
mbed714	0:d616ece2d859	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
mbed714	0:d616ece2d859	1151
mbed714	0:d616ece2d859	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
mbed714	0:d616ece2d859	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
mbed714	0:d616ece2d859	1154	/* set hwlen and protolen */
mbed714	0:d616ece2d859	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
mbed714	0:d616ece2d859	1156	hdr->protolen = sizeof(ip_addr_t);
mbed714	0:d616ece2d859	1157
mbed714	0:d616ece2d859	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
mbed714	0:d616ece2d859	1159	/* send ARP query */
mbed714	0:d616ece2d859	1160	result = netif->linkoutput(netif, p);
mbed714	0:d616ece2d859	1161	ETHARP_STATS_INC(etharp.xmit);
mbed714	0:d616ece2d859	1162	/* free ARP query packet */
mbed714	0:d616ece2d859	1163	pbuf_free(p);
mbed714	0:d616ece2d859	1164	p = NULL;
mbed714	0:d616ece2d859	1165	/* could not allocate pbuf for ARP request */
mbed714	0:d616ece2d859	1166
mbed714	0:d616ece2d859	1167	return result;
mbed714	0:d616ece2d859	1168	}
mbed714	0:d616ece2d859	1169
mbed714	0:d616ece2d859	1170	/**
mbed714	0:d616ece2d859	1171	* Send an ARP request packet asking for ipaddr.
mbed714	0:d616ece2d859	1172	*
mbed714	0:d616ece2d859	1173	* @param netif the lwip network interface on which to send the request
mbed714	0:d616ece2d859	1174	* @param ipaddr the IP address for which to ask
mbed714	0:d616ece2d859	1175	* @return ERR_OK if the request has been sent
mbed714	0:d616ece2d859	1176	* ERR_MEM if the ARP packet couldn't be allocated
mbed714	0:d616ece2d859	1177	* any other err_t on failure
mbed714	0:d616ece2d859	1178	*/
mbed714	0:d616ece2d859	1179	err_t
mbed714	0:d616ece2d859	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
mbed714	0:d616ece2d859	1181	{
mbed714	0:d616ece2d859	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
mbed714	0:d616ece2d859	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
mbed714	0:d616ece2d859	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
mbed714	0:d616ece2d859	1185	ipaddr, ARP_REQUEST);
mbed714	0:d616ece2d859	1186	}
mbed714	0:d616ece2d859	1187	#endif /* LWIP_ARP */
mbed714	0:d616ece2d859	1188
mbed714	0:d616ece2d859	1189	/**
mbed714	0:d616ece2d859	1190	* Process received ethernet frames. Using this function instead of directly
mbed714	0:d616ece2d859	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
mbed714	0:d616ece2d859	1192	* the ARP cache is protected from concurrent access.
mbed714	0:d616ece2d859	1193	*
mbed714	0:d616ece2d859	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
mbed714	0:d616ece2d859	1195	* @param netif the network interface on which the packet was received
mbed714	0:d616ece2d859	1196	*/
mbed714	0:d616ece2d859	1197	err_t
mbed714	0:d616ece2d859	1198	ethernet_input(struct pbuf p, struct netif netif)
mbed714	0:d616ece2d859	1199	{
mbed714	0:d616ece2d859	1200	struct eth_hdr* ethhdr;
mbed714	0:d616ece2d859	1201	u16_t type;
mbed714	0:d616ece2d859	1202
mbed714	0:d616ece2d859	1203	/* points to packet payload, which starts with an Ethernet header */
mbed714	0:d616ece2d859	1204	ethhdr = (struct eth_hdr *)p->payload;
mbed714	0:d616ece2d859	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
mbed714	0:d616ece2d859	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",
mbed714	0:d616ece2d859	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
mbed714	0:d616ece2d859	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
mbed714	0:d616ece2d859	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
mbed714	0:d616ece2d859	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
mbed714	0:d616ece2d859	1211	(unsigned)htons(ethhdr->type)));
mbed714	0:d616ece2d859	1212
mbed714	0:d616ece2d859	1213	type = ethhdr->type;
mbed714	0:d616ece2d859	1214	#if ETHARP_SUPPORT_VLAN
mbed714	0:d616ece2d859	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
mbed714	0:d616ece2d859	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
mbed714	0:d616ece2d859	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
mbed714	0:d616ece2d859	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
mbed714	0:d616ece2d859	1219	/* silently ignore this packet: not for our VLAN */
mbed714	0:d616ece2d859	1220	pbuf_free(p);
mbed714	0:d616ece2d859	1221	return ERR_OK;
mbed714	0:d616ece2d859	1222	}
mbed714	0:d616ece2d859	1223	#endif /* ETHARP_VLAN_CHECK */
mbed714	0:d616ece2d859	1224	type = vlan->tpid;
mbed714	0:d616ece2d859	1225	}
mbed714	0:d616ece2d859	1226	#endif /* ETHARP_SUPPORT_VLAN */
mbed714	0:d616ece2d859	1227
mbed714	0:d616ece2d859	1228	#if LWIP_ARP_FILTER_NETIF
mbed714	0:d616ece2d859	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
mbed714	0:d616ece2d859	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
mbed714	0:d616ece2d859	1231
mbed714	0:d616ece2d859	1232	switch (type) {
mbed714	0:d616ece2d859	1233	#if LWIP_ARP
mbed714	0:d616ece2d859	1234	/* IP packet? */
mbed714	0:d616ece2d859	1235	case PP_HTONS(ETHTYPE_IP):
mbed714	0:d616ece2d859	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
mbed714	0:d616ece2d859	1237	goto free_and_return;
mbed714	0:d616ece2d859	1238	}
mbed714	0:d616ece2d859	1239	#if ETHARP_TRUST_IP_MAC
mbed714	0:d616ece2d859	1240	/* update ARP table */
mbed714	0:d616ece2d859	1241	etharp_ip_input(netif, p);
mbed714	0:d616ece2d859	1242	#endif /* ETHARP_TRUST_IP_MAC */
mbed714	0:d616ece2d859	1243	/* skip Ethernet header */
mbed714	0:d616ece2d859	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
mbed714	0:d616ece2d859	1245	LWIP_ASSERT("Can't move over header in packet", 0);
mbed714	0:d616ece2d859	1246	goto free_and_return;
mbed714	0:d616ece2d859	1247	} else {
mbed714	0:d616ece2d859	1248	/* pass to IP layer */
mbed714	0:d616ece2d859	1249	ip_input(p, netif);
mbed714	0:d616ece2d859	1250	}
mbed714	0:d616ece2d859	1251	break;
mbed714	0:d616ece2d859	1252
mbed714	0:d616ece2d859	1253	case PP_HTONS(ETHTYPE_ARP):
mbed714	0:d616ece2d859	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
mbed714	0:d616ece2d859	1255	goto free_and_return;
mbed714	0:d616ece2d859	1256	}
mbed714	0:d616ece2d859	1257	/* pass p to ARP module */
mbed714	0:d616ece2d859	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
mbed714	0:d616ece2d859	1259	break;
mbed714	0:d616ece2d859	1260	#endif /* LWIP_ARP */
mbed714	0:d616ece2d859	1261	#if PPPOE_SUPPORT
mbed714	0:d616ece2d859	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
mbed714	0:d616ece2d859	1263	pppoe_disc_input(netif, p);
mbed714	0:d616ece2d859	1264	break;
mbed714	0:d616ece2d859	1265
mbed714	0:d616ece2d859	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
mbed714	0:d616ece2d859	1267	pppoe_data_input(netif, p);
mbed714	0:d616ece2d859	1268	break;
mbed714	0:d616ece2d859	1269	#endif /* PPPOE_SUPPORT */
mbed714	0:d616ece2d859	1270
mbed714	0:d616ece2d859	1271	default:
mbed714	0:d616ece2d859	1272	ETHARP_STATS_INC(etharp.proterr);
mbed714	0:d616ece2d859	1273	ETHARP_STATS_INC(etharp.drop);
mbed714	0:d616ece2d859	1274	goto free_and_return;
mbed714	0:d616ece2d859	1275	}
mbed714	0:d616ece2d859	1276
mbed714	0:d616ece2d859	1277	/* This means the pbuf is freed or consumed,
mbed714	0:d616ece2d859	1278	so the caller doesn't have to free it again */
mbed714	0:d616ece2d859	1279	return ERR_OK;
mbed714	0:d616ece2d859	1280
mbed714	0:d616ece2d859	1281	free_and_return:
mbed714	0:d616ece2d859	1282	pbuf_free(p);
mbed714	0:d616ece2d859	1283	return ERR_OK;
mbed714	0:d616ece2d859	1284	}
mbed714	0:d616ece2d859	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Library
Created:	18 Sep 2010
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

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lwip/netif/etharp.c@0:d616ece2d859, 2010-09-18 (annotated)

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