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lwip/netif/etharp.c@5:dd63a1e02b1b, 2010-07-27 (annotated)

Committer:: donatien
Date:: Tue Jul 27 15:59:42 2010 +0000
Revision:: 5:dd63a1e02b1b
Parent:: 0:632c9925f013

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:632c9925f013	1	/**
donatien	0:632c9925f013	2	* @file
donatien	0:632c9925f013	3	* Address Resolution Protocol module for IP over Ethernet
donatien	0:632c9925f013	4	*
donatien	0:632c9925f013	5	* Functionally, ARP is divided into two parts. The first maps an IP address
donatien	0:632c9925f013	6	* to a physical address when sending a packet, and the second part answers
donatien	0:632c9925f013	7	* requests from other machines for our physical address.
donatien	0:632c9925f013	8	*
donatien	0:632c9925f013	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
donatien	0:632c9925f013	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
donatien	0:632c9925f013	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
donatien	0:632c9925f013	12	*/
donatien	0:632c9925f013	13
donatien	0:632c9925f013	14	/*
donatien	0:632c9925f013	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
donatien	0:632c9925f013	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
donatien	0:632c9925f013	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
donatien	0:632c9925f013	18	* All rights reserved.
donatien	0:632c9925f013	19	*
donatien	0:632c9925f013	20	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:632c9925f013	21	* are permitted provided that the following conditions are met:
donatien	0:632c9925f013	22	*
donatien	0:632c9925f013	23	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:632c9925f013	24	* this list of conditions and the following disclaimer.
donatien	0:632c9925f013	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:632c9925f013	26	* this list of conditions and the following disclaimer in the documentation
donatien	0:632c9925f013	27	* and/or other materials provided with the distribution.
donatien	0:632c9925f013	28	* 3. The name of the author may not be used to endorse or promote products
donatien	0:632c9925f013	29	* derived from this software without specific prior written permission.
donatien	0:632c9925f013	30	*
donatien	0:632c9925f013	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:632c9925f013	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:632c9925f013	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:632c9925f013	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:632c9925f013	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:632c9925f013	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:632c9925f013	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:632c9925f013	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:632c9925f013	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:632c9925f013	40	* OF SUCH DAMAGE.
donatien	0:632c9925f013	41	*
donatien	0:632c9925f013	42	* This file is part of the lwIP TCP/IP stack.
donatien	0:632c9925f013	43	*
donatien	0:632c9925f013	44	*/
donatien	0:632c9925f013	45
donatien	0:632c9925f013	46	#include "lwip/opt.h"
donatien	0:632c9925f013	47
donatien	0:632c9925f013	48	#if LWIP_ARP \|\| LWIP_ETHERNET
donatien	0:632c9925f013	49
donatien	0:632c9925f013	50	#include "lwip/ip_addr.h"
donatien	0:632c9925f013	51	#include "lwip/def.h"
donatien	0:632c9925f013	52	#include "lwip/ip.h"
donatien	0:632c9925f013	53	#include "lwip/stats.h"
donatien	0:632c9925f013	54	#include "lwip/snmp.h"
donatien	0:632c9925f013	55	#include "lwip/dhcp.h"
donatien	0:632c9925f013	56	#include "lwip/autoip.h"
donatien	0:632c9925f013	57	#include "netif/etharp.h"
donatien	0:632c9925f013	58
donatien	0:632c9925f013	59	#if PPPOE_SUPPORT
donatien	0:632c9925f013	60	#include "netif/ppp_oe.h"
donatien	0:632c9925f013	61	#endif /* PPPOE_SUPPORT */
donatien	0:632c9925f013	62
donatien	0:632c9925f013	63	#include <string.h>
donatien	0:632c9925f013	64
donatien	0:632c9925f013	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
donatien	0:632c9925f013	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
donatien	0:632c9925f013	67
donatien	0:632c9925f013	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
donatien	0:632c9925f013	69
donatien	0:632c9925f013	70	/** the time an ARP entry stays valid after its last update,
donatien	0:632c9925f013	71	* for ARP_TMR_INTERVAL = 5000, this is
donatien	0:632c9925f013	72	* (240 * 5) seconds = 20 minutes.
donatien	0:632c9925f013	73	*/
donatien	0:632c9925f013	74	#define ARP_MAXAGE 240
donatien	0:632c9925f013	75	/** the time an ARP entry stays pending after first request,
donatien	0:632c9925f013	76	* for ARP_TMR_INTERVAL = 5000, this is
donatien	0:632c9925f013	77	* (2 * 5) seconds = 10 seconds.
donatien	0:632c9925f013	78	*
donatien	0:632c9925f013	79	* @internal Keep this number at least 2, otherwise it might
donatien	0:632c9925f013	80	* run out instantly if the timeout occurs directly after a request.
donatien	0:632c9925f013	81	*/
donatien	0:632c9925f013	82	#define ARP_MAXPENDING 2
donatien	0:632c9925f013	83
donatien	0:632c9925f013	84	#define HWTYPE_ETHERNET 1
donatien	0:632c9925f013	85
donatien	0:632c9925f013	86	enum etharp_state {
donatien	0:632c9925f013	87	ETHARP_STATE_EMPTY = 0,
donatien	0:632c9925f013	88	ETHARP_STATE_PENDING,
donatien	0:632c9925f013	89	ETHARP_STATE_STABLE
donatien	0:632c9925f013	90	};
donatien	0:632c9925f013	91
donatien	0:632c9925f013	92	struct etharp_entry {
donatien	0:632c9925f013	93	#if ARP_QUEUEING
donatien	5:dd63a1e02b1b	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
donatien	0:632c9925f013	95	struct etharp_q_entry *q;
donatien	0:632c9925f013	96	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	97	ip_addr_t ipaddr;
donatien	0:632c9925f013	98	struct eth_addr ethaddr;
donatien	5:dd63a1e02b1b	99	#if LWIP_SNMP
donatien	5:dd63a1e02b1b	100	struct netif *netif;
donatien	5:dd63a1e02b1b	101	#endif /* LWIP_SNMP */
donatien	5:dd63a1e02b1b	102	u8_t state;
donatien	0:632c9925f013	103	u8_t ctime;
donatien	5:dd63a1e02b1b	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	105	u8_t static_entry;
donatien	5:dd63a1e02b1b	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	0:632c9925f013	107	};
donatien	0:632c9925f013	108
donatien	0:632c9925f013	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
donatien	5:dd63a1e02b1b	110
donatien	0:632c9925f013	111	#if !LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	112	static u8_t etharp_cached_entry;
donatien	0:632c9925f013	113	#endif /* !LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	114
donatien	5:dd63a1e02b1b	115	/** Try hard to create a new entry - we want the IP address to appear in
donatien	5:dd63a1e02b1b	116	the cache (even if this means removing an active entry or so). */
donatien	5:dd63a1e02b1b	117	#define ETHARP_FLAG_TRY_HARD 1
donatien	5:dd63a1e02b1b	118	#define ETHARP_FLAG_FIND_ONLY 2
donatien	5:dd63a1e02b1b	119	#define ETHARP_FLAG_STATIC_ENTRY 4
donatien	0:632c9925f013	120
donatien	0:632c9925f013	121	#if LWIP_NETIF_HWADDRHINT
donatien	5:dd63a1e02b1b	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
donatien	0:632c9925f013	123	*((netif)->addr_hint) = (hint);
donatien	0:632c9925f013	124	#else /* LWIP_NETIF_HWADDRHINT */
donatien	5:dd63a1e02b1b	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
donatien	0:632c9925f013	126	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	127
donatien	0:632c9925f013	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
donatien	0:632c9925f013	129
donatien	0:632c9925f013	130
donatien	0:632c9925f013	131	/* Some checks, instead of etharp_init(): */
donatien	0:632c9925f013	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
donatien	5:dd63a1e02b1b	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
donatien	0:632c9925f013	134	#endif
donatien	0:632c9925f013	135
donatien	0:632c9925f013	136
donatien	0:632c9925f013	137	#if ARP_QUEUEING
donatien	0:632c9925f013	138	/**
donatien	0:632c9925f013	139	* Free a complete queue of etharp entries
donatien	0:632c9925f013	140	*
donatien	0:632c9925f013	141	* @param q a qeueue of etharp_q_entry's to free
donatien	0:632c9925f013	142	*/
donatien	0:632c9925f013	143	static void
donatien	0:632c9925f013	144	free_etharp_q(struct etharp_q_entry *q)
donatien	0:632c9925f013	145	{
donatien	0:632c9925f013	146	struct etharp_q_entry *r;
donatien	0:632c9925f013	147	LWIP_ASSERT("q != NULL", q != NULL);
donatien	0:632c9925f013	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
donatien	0:632c9925f013	149	while (q) {
donatien	0:632c9925f013	150	r = q;
donatien	0:632c9925f013	151	q = q->next;
donatien	0:632c9925f013	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
donatien	0:632c9925f013	153	pbuf_free(r->p);
donatien	0:632c9925f013	154	memp_free(MEMP_ARP_QUEUE, r);
donatien	0:632c9925f013	155	}
donatien	0:632c9925f013	156	}
donatien	0:632c9925f013	157	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	158
donatien	5:dd63a1e02b1b	159	/** Clean up ARP table entries */
donatien	5:dd63a1e02b1b	160	static void
donatien	5:dd63a1e02b1b	161	free_entry(int i)
donatien	5:dd63a1e02b1b	162	{
donatien	5:dd63a1e02b1b	163	/* remove from SNMP ARP index tree */
donatien	5:dd63a1e02b1b	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
donatien	5:dd63a1e02b1b	165	#if ARP_QUEUEING
donatien	5:dd63a1e02b1b	166	/* and empty packet queue */
donatien	5:dd63a1e02b1b	167	if (arp_table[i].q != NULL) {
donatien	5:dd63a1e02b1b	168	/* remove all queued packets */
donatien	5:dd63a1e02b1b	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
donatien	5:dd63a1e02b1b	170	free_etharp_q(arp_table[i].q);
donatien	5:dd63a1e02b1b	171	arp_table[i].q = NULL;
donatien	5:dd63a1e02b1b	172	}
donatien	5:dd63a1e02b1b	173	#endif /* ARP_QUEUEING */
donatien	5:dd63a1e02b1b	174	/* recycle entry for re-use */
donatien	5:dd63a1e02b1b	175	arp_table[i].state = ETHARP_STATE_EMPTY;
donatien	5:dd63a1e02b1b	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	177	arp_table[i].static_entry = 0;
donatien	5:dd63a1e02b1b	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	5:dd63a1e02b1b	179	#ifdef LWIP_DEBUG
donatien	5:dd63a1e02b1b	180	/* for debugging, clean out the complete entry */
donatien	5:dd63a1e02b1b	181	arp_table[i].ctime = 0;
donatien	5:dd63a1e02b1b	182	#if LWIP_SNMP
donatien	5:dd63a1e02b1b	183	arp_table[i].netif = NULL;
donatien	5:dd63a1e02b1b	184	#endif /* LWIP_SNMP */
donatien	5:dd63a1e02b1b	185	ip_addr_set_zero(&arp_table[i].ipaddr);
donatien	5:dd63a1e02b1b	186	arp_table[i].ethaddr = ethzero;
donatien	5:dd63a1e02b1b	187	#endif /* LWIP_DEBUG */
donatien	5:dd63a1e02b1b	188	}
donatien	5:dd63a1e02b1b	189
donatien	0:632c9925f013	190	/**
donatien	0:632c9925f013	191	* Clears expired entries in the ARP table.
donatien	0:632c9925f013	192	*
donatien	5:dd63a1e02b1b	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
donatien	0:632c9925f013	194	* in order to expire entries in the ARP table.
donatien	0:632c9925f013	195	*/
donatien	0:632c9925f013	196	void
donatien	0:632c9925f013	197	etharp_tmr(void)
donatien	0:632c9925f013	198	{
donatien	0:632c9925f013	199	u8_t i;
donatien	0:632c9925f013	200
donatien	0:632c9925f013	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
donatien	0:632c9925f013	202	/* remove expired entries from the ARP table */
donatien	0:632c9925f013	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
donatien	5:dd63a1e02b1b	204	u8_t state = arp_table[i].state;
donatien	5:dd63a1e02b1b	205	if (state != ETHARP_STATE_EMPTY
donatien	5:dd63a1e02b1b	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	207	&& (arp_table[i].static_entry == 0)
donatien	5:dd63a1e02b1b	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	5:dd63a1e02b1b	209	) {
donatien	5:dd63a1e02b1b	210	arp_table[i].ctime++;
donatien	5:dd63a1e02b1b	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
donatien	5:dd63a1e02b1b	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
donatien	5:dd63a1e02b1b	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
donatien	5:dd63a1e02b1b	214	/* pending or stable entry has become old! */
donatien	5:dd63a1e02b1b	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
donatien	5:dd63a1e02b1b	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
donatien	5:dd63a1e02b1b	217	/* clean up entries that have just been expired */
donatien	5:dd63a1e02b1b	218	free_entry(i);
donatien	5:dd63a1e02b1b	219	}
donatien	0:632c9925f013	220	#if ARP_QUEUEING
donatien	5:dd63a1e02b1b	221	/* still pending entry? (not expired) */
donatien	5:dd63a1e02b1b	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	5:dd63a1e02b1b	223	/* resend an ARP query here? */
donatien	0:632c9925f013	224	}
donatien	0:632c9925f013	225	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	226	}
donatien	0:632c9925f013	227	}
donatien	0:632c9925f013	228	}
donatien	0:632c9925f013	229
donatien	0:632c9925f013	230	/**
donatien	0:632c9925f013	231	* Search the ARP table for a matching or new entry.
donatien	0:632c9925f013	232	*
donatien	0:632c9925f013	233	* If an IP address is given, return a pending or stable ARP entry that matches
donatien	0:632c9925f013	234	* the address. If no match is found, create a new entry with this address set,
donatien	0:632c9925f013	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
donatien	0:632c9925f013	236	* state of the returned entry.
donatien	0:632c9925f013	237	*
donatien	0:632c9925f013	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
donatien	0:632c9925f013	239	*
donatien	0:632c9925f013	240	* In all cases, attempt to create new entries from an empty entry. If no
donatien	5:dd63a1e02b1b	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
donatien	0:632c9925f013	242	* old entries. Heuristic choose the least important entry for recycling.
donatien	0:632c9925f013	243	*
donatien	0:632c9925f013	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
donatien	5:dd63a1e02b1b	245	* @param flags @see definition of ETHARP_FLAG_*
donatien	5:dd63a1e02b1b	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
donatien	0:632c9925f013	247	*
donatien	0:632c9925f013	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
donatien	0:632c9925f013	249	* entry is found or could be recycled.
donatien	0:632c9925f013	250	*/
donatien	0:632c9925f013	251	static s8_t
donatien	0:632c9925f013	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
donatien	0:632c9925f013	253	{
donatien	0:632c9925f013	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
donatien	0:632c9925f013	255	s8_t empty = ARP_TABLE_SIZE;
donatien	0:632c9925f013	256	u8_t i = 0, age_pending = 0, age_stable = 0;
donatien	0:632c9925f013	257	#if ARP_QUEUEING
donatien	0:632c9925f013	258	/* oldest entry with packets on queue */
donatien	0:632c9925f013	259	s8_t old_queue = ARP_TABLE_SIZE;
donatien	0:632c9925f013	260	/* its age */
donatien	0:632c9925f013	261	u8_t age_queue = 0;
donatien	0:632c9925f013	262	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	263
donatien	0:632c9925f013	264	/**
donatien	0:632c9925f013	265	* a) do a search through the cache, remember candidates
donatien	0:632c9925f013	266	* b) select candidate entry
donatien	0:632c9925f013	267	* c) create new entry
donatien	0:632c9925f013	268	*/
donatien	0:632c9925f013	269
donatien	0:632c9925f013	270	/* a) in a single search sweep, do all of this
donatien	0:632c9925f013	271	* 1) remember the first empty entry (if any)
donatien	0:632c9925f013	272	* 2) remember the oldest stable entry (if any)
donatien	0:632c9925f013	273	* 3) remember the oldest pending entry without queued packets (if any)
donatien	0:632c9925f013	274	* 4) remember the oldest pending entry with queued packets (if any)
donatien	0:632c9925f013	275	* 5) search for a matching IP entry, either pending or stable
donatien	0:632c9925f013	276	* until 5 matches, or all entries are searched for.
donatien	0:632c9925f013	277	*/
donatien	0:632c9925f013	278
donatien	0:632c9925f013	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
donatien	5:dd63a1e02b1b	280	u8_t state = arp_table[i].state;
donatien	0:632c9925f013	281	/* no empty entry found yet and now we do find one? */
donatien	5:dd63a1e02b1b	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
donatien	0:632c9925f013	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	284	/* remember first empty entry */
donatien	0:632c9925f013	285	empty = i;
donatien	5:dd63a1e02b1b	286	} else if (state != ETHARP_STATE_EMPTY) {
donatien	5:dd63a1e02b1b	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
donatien	5:dd63a1e02b1b	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
donatien	0:632c9925f013	289	/* if given, does IP address match IP address in ARP entry? */
donatien	0:632c9925f013	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
donatien	5:dd63a1e02b1b	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	292	/* found exact IP address match, simply bail out */
donatien	0:632c9925f013	293	return i;
donatien	5:dd63a1e02b1b	294	}
donatien	5:dd63a1e02b1b	295	/* pending entry? */
donatien	5:dd63a1e02b1b	296	if (state == ETHARP_STATE_PENDING) {
donatien	5:dd63a1e02b1b	297	/* pending with queued packets? */
donatien	0:632c9925f013	298	#if ARP_QUEUEING
donatien	5:dd63a1e02b1b	299	if (arp_table[i].q != NULL) {
donatien	5:dd63a1e02b1b	300	if (arp_table[i].ctime >= age_queue) {
donatien	5:dd63a1e02b1b	301	old_queue = i;
donatien	5:dd63a1e02b1b	302	age_queue = arp_table[i].ctime;
donatien	5:dd63a1e02b1b	303	}
donatien	5:dd63a1e02b1b	304	} else
donatien	0:632c9925f013	305	#endif /* ARP_QUEUEING */
donatien	5:dd63a1e02b1b	306	/* pending without queued packets? */
donatien	5:dd63a1e02b1b	307	{
donatien	5:dd63a1e02b1b	308	if (arp_table[i].ctime >= age_pending) {
donatien	5:dd63a1e02b1b	309	old_pending = i;
donatien	5:dd63a1e02b1b	310	age_pending = arp_table[i].ctime;
donatien	5:dd63a1e02b1b	311	}
donatien	0:632c9925f013	312	}
donatien	5:dd63a1e02b1b	313	/* stable entry? */
donatien	5:dd63a1e02b1b	314	} else if (state == ETHARP_STATE_STABLE) {
donatien	5:dd63a1e02b1b	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	316	/* don't record old_stable for static entries since they never expire */
donatien	5:dd63a1e02b1b	317	if (arp_table[i].static_entry == 0)
donatien	5:dd63a1e02b1b	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	5:dd63a1e02b1b	319	{
donatien	5:dd63a1e02b1b	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
donatien	5:dd63a1e02b1b	321	if (arp_table[i].ctime >= age_stable) {
donatien	5:dd63a1e02b1b	322	old_stable = i;
donatien	5:dd63a1e02b1b	323	age_stable = arp_table[i].ctime;
donatien	5:dd63a1e02b1b	324	}
donatien	5:dd63a1e02b1b	325	}
donatien	0:632c9925f013	326	}
donatien	0:632c9925f013	327	}
donatien	0:632c9925f013	328	}
donatien	0:632c9925f013	329	/* { we have no match } => try to create a new entry */
donatien	0:632c9925f013	330
donatien	0:632c9925f013	331	/* don't create new entry, only search? */
donatien	5:dd63a1e02b1b	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
donatien	0:632c9925f013	333	/* or no empty entry found and not allowed to recycle? */
donatien	5:dd63a1e02b1b	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
donatien	0:632c9925f013	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
donatien	0:632c9925f013	336	return (s8_t)ERR_MEM;
donatien	0:632c9925f013	337	}
donatien	0:632c9925f013	338
donatien	0:632c9925f013	339	/* b) choose the least destructive entry to recycle:
donatien	0:632c9925f013	340	* 1) empty entry
donatien	0:632c9925f013	341	* 2) oldest stable entry
donatien	0:632c9925f013	342	* 3) oldest pending entry without queued packets
donatien	0:632c9925f013	343	* 4) oldest pending entry with queued packets
donatien	0:632c9925f013	344	*
donatien	5:dd63a1e02b1b	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
donatien	0:632c9925f013	346	*/
donatien	0:632c9925f013	347
donatien	0:632c9925f013	348	/* 1) empty entry available? */
donatien	0:632c9925f013	349	if (empty < ARP_TABLE_SIZE) {
donatien	0:632c9925f013	350	i = empty;
donatien	0:632c9925f013	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
donatien	5:dd63a1e02b1b	352	} else {
donatien	5:dd63a1e02b1b	353	/* 2) found recyclable stable entry? */
donatien	5:dd63a1e02b1b	354	if (old_stable < ARP_TABLE_SIZE) {
donatien	5:dd63a1e02b1b	355	/* recycle oldest stable*/
donatien	5:dd63a1e02b1b	356	i = old_stable;
donatien	5:dd63a1e02b1b	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	358	#if ARP_QUEUEING
donatien	5:dd63a1e02b1b	359	/* no queued packets should exist on stable entries */
donatien	5:dd63a1e02b1b	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
donatien	0:632c9925f013	361	#endif /* ARP_QUEUEING */
donatien	5:dd63a1e02b1b	362	/* 3) found recyclable pending entry without queued packets? */
donatien	5:dd63a1e02b1b	363	} else if (old_pending < ARP_TABLE_SIZE) {
donatien	5:dd63a1e02b1b	364	/* recycle oldest pending */
donatien	5:dd63a1e02b1b	365	i = old_pending;
donatien	5:dd63a1e02b1b	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
donatien	0:632c9925f013	367	#if ARP_QUEUEING
donatien	5:dd63a1e02b1b	368	/* 4) found recyclable pending entry with queued packets? */
donatien	5:dd63a1e02b1b	369	} else if (old_queue < ARP_TABLE_SIZE) {
donatien	5:dd63a1e02b1b	370	/* recycle oldest pending (queued packets are free in free_entry) */
donatien	5:dd63a1e02b1b	371	i = old_queue;
donatien	5:dd63a1e02b1b	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	0:632c9925f013	373	#endif /* ARP_QUEUEING */
donatien	5:dd63a1e02b1b	374	/* no empty or recyclable entries found */
donatien	5:dd63a1e02b1b	375	} else {
donatien	5:dd63a1e02b1b	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
donatien	5:dd63a1e02b1b	377	return (s8_t)ERR_MEM;
donatien	5:dd63a1e02b1b	378	}
donatien	5:dd63a1e02b1b	379
donatien	5:dd63a1e02b1b	380	/* { empty or recyclable entry found } */
donatien	5:dd63a1e02b1b	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
donatien	5:dd63a1e02b1b	382	free_entry(i);
donatien	0:632c9925f013	383	}
donatien	0:632c9925f013	384
donatien	0:632c9925f013	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
donatien	5:dd63a1e02b1b	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
donatien	5:dd63a1e02b1b	387	arp_table[i].state == ETHARP_STATE_EMPTY);
donatien	0:632c9925f013	388
donatien	0:632c9925f013	389	/* IP address given? */
donatien	0:632c9925f013	390	if (ipaddr != NULL) {
donatien	0:632c9925f013	391	/* set IP address */
donatien	0:632c9925f013	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
donatien	0:632c9925f013	393	}
donatien	0:632c9925f013	394	arp_table[i].ctime = 0;
donatien	5:dd63a1e02b1b	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	396	arp_table[i].static_entry = 0;
donatien	5:dd63a1e02b1b	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	0:632c9925f013	398	return (err_t)i;
donatien	0:632c9925f013	399	}
donatien	0:632c9925f013	400
donatien	0:632c9925f013	401	/**
donatien	0:632c9925f013	402	* Send an IP packet on the network using netif->linkoutput
donatien	0:632c9925f013	403	* The ethernet header is filled in before sending.
donatien	0:632c9925f013	404	*
donatien	0:632c9925f013	405	* @params netif the lwIP network interface on which to send the packet
donatien	0:632c9925f013	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
donatien	0:632c9925f013	407	* @params src the source MAC address to be copied into the ethernet header
donatien	0:632c9925f013	408	* @params dst the destination MAC address to be copied into the ethernet header
donatien	0:632c9925f013	409	* @return ERR_OK if the packet was sent, any other err_t on failure
donatien	0:632c9925f013	410	*/
donatien	0:632c9925f013	411	static err_t
donatien	0:632c9925f013	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
donatien	0:632c9925f013	413	{
donatien	0:632c9925f013	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
donatien	0:632c9925f013	415
donatien	0:632c9925f013	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:632c9925f013	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	5:dd63a1e02b1b	418	ETHADDR32_COPY(&ethhdr->dest, dst);
donatien	5:dd63a1e02b1b	419	ETHADDR16_COPY(&ethhdr->src, src);
donatien	5:dd63a1e02b1b	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
donatien	0:632c9925f013	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
donatien	0:632c9925f013	422	/* send the packet */
donatien	0:632c9925f013	423	return netif->linkoutput(netif, p);
donatien	0:632c9925f013	424	}
donatien	0:632c9925f013	425
donatien	0:632c9925f013	426	/**
donatien	0:632c9925f013	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
donatien	0:632c9925f013	428	*
donatien	0:632c9925f013	429	* If a pending entry is resolved, any queued packets will be sent
donatien	0:632c9925f013	430	* at this point.
donatien	0:632c9925f013	431	*
donatien	5:dd63a1e02b1b	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
donatien	0:632c9925f013	433	* @param ipaddr IP address of the inserted ARP entry.
donatien	0:632c9925f013	434	* @param ethaddr Ethernet address of the inserted ARP entry.
donatien	5:dd63a1e02b1b	435	* @param flags @see definition of ETHARP_FLAG_*
donatien	0:632c9925f013	436	*
donatien	0:632c9925f013	437	* @return
donatien	0:632c9925f013	438	* - ERR_OK Succesfully updated ARP cache.
donatien	5:dd63a1e02b1b	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
donatien	0:632c9925f013	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
donatien	0:632c9925f013	441	*
donatien	0:632c9925f013	442	* @see pbuf_free()
donatien	0:632c9925f013	443	*/
donatien	0:632c9925f013	444	static err_t
donatien	0:632c9925f013	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
donatien	0:632c9925f013	446	{
donatien	0:632c9925f013	447	s8_t i;
donatien	0:632c9925f013	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
donatien	0:632c9925f013	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	0:632c9925f013	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
donatien	0:632c9925f013	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
donatien	0:632c9925f013	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
donatien	0:632c9925f013	453	/* non-unicast address? */
donatien	0:632c9925f013	454	if (ip_addr_isany(ipaddr) \|\|
donatien	0:632c9925f013	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
donatien	0:632c9925f013	456	ip_addr_ismulticast(ipaddr)) {
donatien	0:632c9925f013	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
donatien	0:632c9925f013	458	return ERR_ARG;
donatien	0:632c9925f013	459	}
donatien	0:632c9925f013	460	/* find or create ARP entry */
donatien	0:632c9925f013	461	i = find_entry(ipaddr, flags);
donatien	0:632c9925f013	462	/* bail out if no entry could be found */
donatien	5:dd63a1e02b1b	463	if (i < 0) {
donatien	0:632c9925f013	464	return (err_t)i;
donatien	5:dd63a1e02b1b	465	}
donatien	5:dd63a1e02b1b	466
donatien	5:dd63a1e02b1b	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
donatien	5:dd63a1e02b1b	469	/* record static type */
donatien	5:dd63a1e02b1b	470	arp_table[i].static_entry = 1;
donatien	5:dd63a1e02b1b	471	}
donatien	5:dd63a1e02b1b	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	5:dd63a1e02b1b	473
donatien	0:632c9925f013	474	/* mark it stable */
donatien	0:632c9925f013	475	arp_table[i].state = ETHARP_STATE_STABLE;
donatien	5:dd63a1e02b1b	476
donatien	5:dd63a1e02b1b	477	#if LWIP_SNMP
donatien	0:632c9925f013	478	/* record network interface */
donatien	0:632c9925f013	479	arp_table[i].netif = netif;
donatien	5:dd63a1e02b1b	480	#endif /* LWIP_SNMP */
donatien	0:632c9925f013	481	/* insert in SNMP ARP index tree */
donatien	0:632c9925f013	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
donatien	0:632c9925f013	483
donatien	0:632c9925f013	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
donatien	0:632c9925f013	485	/* update address */
donatien	5:dd63a1e02b1b	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
donatien	0:632c9925f013	487	/* reset time stamp */
donatien	0:632c9925f013	488	arp_table[i].ctime = 0;
donatien	0:632c9925f013	489	#if ARP_QUEUEING
donatien	0:632c9925f013	490	/* this is where we will send out queued packets! */
donatien	0:632c9925f013	491	while (arp_table[i].q != NULL) {
donatien	0:632c9925f013	492	struct pbuf *p;
donatien	0:632c9925f013	493	/* remember remainder of queue */
donatien	0:632c9925f013	494	struct etharp_q_entry *q = arp_table[i].q;
donatien	0:632c9925f013	495	/* pop first item off the queue */
donatien	0:632c9925f013	496	arp_table[i].q = q->next;
donatien	0:632c9925f013	497	/* get the packet pointer */
donatien	0:632c9925f013	498	p = q->p;
donatien	0:632c9925f013	499	/* now queue entry can be freed */
donatien	0:632c9925f013	500	memp_free(MEMP_ARP_QUEUE, q);
donatien	0:632c9925f013	501	/* send the queued IP packet */
donatien	0:632c9925f013	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
donatien	0:632c9925f013	503	/* free the queued IP packet */
donatien	0:632c9925f013	504	pbuf_free(p);
donatien	0:632c9925f013	505	}
donatien	0:632c9925f013	506	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	507	return ERR_OK;
donatien	0:632c9925f013	508	}
donatien	0:632c9925f013	509
donatien	5:dd63a1e02b1b	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
donatien	5:dd63a1e02b1b	511	/** Add a new static entry to the ARP table. If an entry exists for the
donatien	5:dd63a1e02b1b	512	* specified IP address, this entry is overwritten.
donatien	5:dd63a1e02b1b	513	* If packets are queued for the specified IP address, they are sent out.
donatien	5:dd63a1e02b1b	514	*
donatien	5:dd63a1e02b1b	515	* @param ipaddr IP address for the new static entry
donatien	5:dd63a1e02b1b	516	* @param ethaddr ethernet address for the new static entry
donatien	5:dd63a1e02b1b	517	* @return @see return values of etharp_add_static_entry
donatien	5:dd63a1e02b1b	518	*/
donatien	5:dd63a1e02b1b	519	err_t
donatien	5:dd63a1e02b1b	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
donatien	5:dd63a1e02b1b	521	{
donatien	5:dd63a1e02b1b	522	struct netif *netif;
donatien	5:dd63a1e02b1b	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	5:dd63a1e02b1b	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
donatien	5:dd63a1e02b1b	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
donatien	5:dd63a1e02b1b	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
donatien	5:dd63a1e02b1b	527
donatien	5:dd63a1e02b1b	528	netif = ip_route(ipaddr);
donatien	5:dd63a1e02b1b	529	if (netif == NULL) {
donatien	5:dd63a1e02b1b	530	return ERR_RTE;
donatien	5:dd63a1e02b1b	531	}
donatien	5:dd63a1e02b1b	532
donatien	5:dd63a1e02b1b	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
donatien	5:dd63a1e02b1b	534	}
donatien	5:dd63a1e02b1b	535
donatien	5:dd63a1e02b1b	536	/** Remove a static entry from the ARP table previously added with a call to
donatien	5:dd63a1e02b1b	537	* etharp_add_static_entry.
donatien	5:dd63a1e02b1b	538	*
donatien	5:dd63a1e02b1b	539	* @param ipaddr IP address of the static entry to remove
donatien	5:dd63a1e02b1b	540	* @return ERR_OK: entry removed
donatien	5:dd63a1e02b1b	541	* ERR_MEM: entry wasn't found
donatien	5:dd63a1e02b1b	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
donatien	5:dd63a1e02b1b	543	*/
donatien	5:dd63a1e02b1b	544	err_t
donatien	5:dd63a1e02b1b	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
donatien	5:dd63a1e02b1b	546	{
donatien	5:dd63a1e02b1b	547	s8_t i;
donatien	5:dd63a1e02b1b	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
donatien	5:dd63a1e02b1b	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
donatien	5:dd63a1e02b1b	550
donatien	5:dd63a1e02b1b	551	/* find or create ARP entry */
donatien	5:dd63a1e02b1b	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
donatien	5:dd63a1e02b1b	553	/* bail out if no entry could be found */
donatien	5:dd63a1e02b1b	554	if (i < 0) {
donatien	5:dd63a1e02b1b	555	return (err_t)i;
donatien	5:dd63a1e02b1b	556	}
donatien	5:dd63a1e02b1b	557
donatien	5:dd63a1e02b1b	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
donatien	5:dd63a1e02b1b	559	(arp_table[i].static_entry == 0)) {
donatien	5:dd63a1e02b1b	560	/* entry wasn't a static entry, cannot remove it */
donatien	5:dd63a1e02b1b	561	return ERR_ARG;
donatien	5:dd63a1e02b1b	562	}
donatien	5:dd63a1e02b1b	563	/* entry found, free it */
donatien	5:dd63a1e02b1b	564	free_entry(i);
donatien	5:dd63a1e02b1b	565	return ERR_OK;
donatien	5:dd63a1e02b1b	566	}
donatien	5:dd63a1e02b1b	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
donatien	5:dd63a1e02b1b	568
donatien	0:632c9925f013	569	/**
donatien	0:632c9925f013	570	* Finds (stable) ethernet/IP address pair from ARP table
donatien	0:632c9925f013	571	* using interface and IP address index.
donatien	0:632c9925f013	572	* @note the addresses in the ARP table are in network order!
donatien	0:632c9925f013	573	*
donatien	0:632c9925f013	574	* @param netif points to interface index
donatien	0:632c9925f013	575	* @param ipaddr points to the (network order) IP address index
donatien	0:632c9925f013	576	* @param eth_ret points to return pointer
donatien	0:632c9925f013	577	* @param ip_ret points to return pointer
donatien	0:632c9925f013	578	* @return table index if found, -1 otherwise
donatien	0:632c9925f013	579	*/
donatien	0:632c9925f013	580	s8_t
donatien	0:632c9925f013	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
donatien	0:632c9925f013	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
donatien	0:632c9925f013	583	{
donatien	0:632c9925f013	584	s8_t i;
donatien	0:632c9925f013	585
donatien	5:dd63a1e02b1b	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
donatien	5:dd63a1e02b1b	587	eth_ret != NULL && ip_ret != NULL);
donatien	5:dd63a1e02b1b	588
donatien	0:632c9925f013	589	LWIP_UNUSED_ARG(netif);
donatien	0:632c9925f013	590
donatien	5:dd63a1e02b1b	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
donatien	0:632c9925f013	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	0:632c9925f013	593	*eth_ret = &arp_table[i].ethaddr;
donatien	0:632c9925f013	594	*ip_ret = &arp_table[i].ipaddr;
donatien	0:632c9925f013	595	return i;
donatien	0:632c9925f013	596	}
donatien	0:632c9925f013	597	return -1;
donatien	0:632c9925f013	598	}
donatien	5:dd63a1e02b1b	599
donatien	0:632c9925f013	600	#if ETHARP_TRUST_IP_MAC
donatien	0:632c9925f013	601	/**
donatien	0:632c9925f013	602	* Updates the ARP table using the given IP packet.
donatien	0:632c9925f013	603	*
donatien	0:632c9925f013	604	* Uses the incoming IP packet's source address to update the
donatien	0:632c9925f013	605	* ARP cache for the local network. The function does not alter
donatien	0:632c9925f013	606	* or free the packet. This function must be called before the
donatien	0:632c9925f013	607	* packet p is passed to the IP layer.
donatien	0:632c9925f013	608	*
donatien	0:632c9925f013	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
donatien	0:632c9925f013	610	* @param p The IP packet that arrived on netif.
donatien	0:632c9925f013	611	*
donatien	0:632c9925f013	612	* @return NULL
donatien	0:632c9925f013	613	*
donatien	0:632c9925f013	614	* @see pbuf_free()
donatien	0:632c9925f013	615	*/
donatien	0:632c9925f013	616	static void
donatien	0:632c9925f013	617	etharp_ip_input(struct netif netif, struct pbuf p)
donatien	0:632c9925f013	618	{
donatien	0:632c9925f013	619	struct eth_hdr *ethhdr;
donatien	0:632c9925f013	620	struct ip_hdr *iphdr;
donatien	5:dd63a1e02b1b	621	ip_addr_t iphdr_src;
donatien	0:632c9925f013	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:632c9925f013	623
donatien	0:632c9925f013	624	/* Only insert an entry if the source IP address of the
donatien	0:632c9925f013	625	incoming IP packet comes from a host on the local network. */
donatien	0:632c9925f013	626	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	628	#if ETHARP_SUPPORT_VLAN
donatien	0:632c9925f013	629	if (ethhdr->type == ETHTYPE_VLAN) {
donatien	0:632c9925f013	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
donatien	0:632c9925f013	631	}
donatien	0:632c9925f013	632	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:632c9925f013	633
donatien	5:dd63a1e02b1b	634	ip_addr_copy(iphdr_src, iphdr->src);
donatien	5:dd63a1e02b1b	635
donatien	0:632c9925f013	636	/* source is not on the local network? */
donatien	5:dd63a1e02b1b	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
donatien	0:632c9925f013	638	/* do nothing */
donatien	0:632c9925f013	639	return;
donatien	0:632c9925f013	640	}
donatien	0:632c9925f013	641
donatien	0:632c9925f013	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
donatien	0:632c9925f013	643	/* update the source IP address in the cache, if present */
donatien	5:dd63a1e02b1b	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
donatien	0:632c9925f013	645	* back soon (for example, if the destination IP address is ours. */
donatien	5:dd63a1e02b1b	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
donatien	0:632c9925f013	647	}
donatien	0:632c9925f013	648	#endif /* ETHARP_TRUST_IP_MAC */
donatien	0:632c9925f013	649
donatien	0:632c9925f013	650	/**
donatien	0:632c9925f013	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
donatien	0:632c9925f013	652	* send out queued IP packets. Updates cache with snooped address pairs.
donatien	0:632c9925f013	653	*
donatien	0:632c9925f013	654	* Should be called for incoming ARP packets. The pbuf in the argument
donatien	0:632c9925f013	655	* is freed by this function.
donatien	0:632c9925f013	656	*
donatien	0:632c9925f013	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
donatien	0:632c9925f013	658	* @param ethaddr Ethernet address of netif.
donatien	0:632c9925f013	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
donatien	0:632c9925f013	660	*
donatien	0:632c9925f013	661	* @return NULL
donatien	0:632c9925f013	662	*
donatien	0:632c9925f013	663	* @see pbuf_free()
donatien	0:632c9925f013	664	*/
donatien	0:632c9925f013	665	static void
donatien	0:632c9925f013	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
donatien	0:632c9925f013	667	{
donatien	0:632c9925f013	668	struct etharp_hdr *hdr;
donatien	0:632c9925f013	669	struct eth_hdr *ethhdr;
donatien	0:632c9925f013	670	/* these are aligned properly, whereas the ARP header fields might not be */
donatien	0:632c9925f013	671	ip_addr_t sipaddr, dipaddr;
donatien	0:632c9925f013	672	u8_t for_us;
donatien	0:632c9925f013	673	#if LWIP_AUTOIP
donatien	0:632c9925f013	674	const u8_t * ethdst_hwaddr;
donatien	0:632c9925f013	675	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	676
donatien	0:632c9925f013	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:632c9925f013	678
donatien	0:632c9925f013	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
donatien	0:632c9925f013	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
donatien	0:632c9925f013	681	if (p->len < SIZEOF_ETHARP_PACKET) {
donatien	0:632c9925f013	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:632c9925f013	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
donatien	0:632c9925f013	684	(s16_t)SIZEOF_ETHARP_PACKET));
donatien	0:632c9925f013	685	ETHARP_STATS_INC(etharp.lenerr);
donatien	0:632c9925f013	686	ETHARP_STATS_INC(etharp.drop);
donatien	0:632c9925f013	687	pbuf_free(p);
donatien	0:632c9925f013	688	return;
donatien	0:632c9925f013	689	}
donatien	0:632c9925f013	690
donatien	0:632c9925f013	691	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	693	#if ETHARP_SUPPORT_VLAN
donatien	0:632c9925f013	694	if (ethhdr->type == ETHTYPE_VLAN) {
donatien	0:632c9925f013	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
donatien	0:632c9925f013	696	}
donatien	0:632c9925f013	697	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:632c9925f013	698
donatien	0:632c9925f013	699	/* RFC 826 "Packet Reception": */
donatien	5:dd63a1e02b1b	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
donatien	5:dd63a1e02b1b	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
donatien	5:dd63a1e02b1b	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
donatien	5:dd63a1e02b1b	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
donatien	5:dd63a1e02b1b	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
donatien	0:632c9925f013	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:632c9925f013	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	5:dd63a1e02b1b	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
donatien	0:632c9925f013	708	ETHARP_STATS_INC(etharp.proterr);
donatien	0:632c9925f013	709	ETHARP_STATS_INC(etharp.drop);
donatien	0:632c9925f013	710	pbuf_free(p);
donatien	0:632c9925f013	711	return;
donatien	0:632c9925f013	712	}
donatien	0:632c9925f013	713	ETHARP_STATS_INC(etharp.recv);
donatien	0:632c9925f013	714
donatien	0:632c9925f013	715	#if LWIP_AUTOIP
donatien	0:632c9925f013	716	/* We have to check if a host already has configured our random
donatien	0:632c9925f013	717	* created link local address and continously check if there is
donatien	0:632c9925f013	718	* a host with this IP-address so we can detect collisions */
donatien	0:632c9925f013	719	autoip_arp_reply(netif, hdr);
donatien	0:632c9925f013	720	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	721
donatien	0:632c9925f013	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
donatien	0:632c9925f013	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
donatien	5:dd63a1e02b1b	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
donatien	5:dd63a1e02b1b	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
donatien	0:632c9925f013	726
donatien	0:632c9925f013	727	/* this interface is not configured? */
donatien	0:632c9925f013	728	if (ip_addr_isany(&netif->ip_addr)) {
donatien	0:632c9925f013	729	for_us = 0;
donatien	0:632c9925f013	730	} else {
donatien	0:632c9925f013	731	/* ARP packet directed to us? */
donatien	0:632c9925f013	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
donatien	0:632c9925f013	733	}
donatien	0:632c9925f013	734
donatien	5:dd63a1e02b1b	735	/* ARP message directed to us?
donatien	5:dd63a1e02b1b	736	-> add IP address in ARP cache; assume requester wants to talk to us,
donatien	5:dd63a1e02b1b	737	can result in directly sending the queued packets for this host.
donatien	5:dd63a1e02b1b	738	ARP message not directed to us?
donatien	5:dd63a1e02b1b	739	-> update the source IP address in the cache, if present */
donatien	5:dd63a1e02b1b	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
donatien	5:dd63a1e02b1b	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
donatien	0:632c9925f013	742
donatien	0:632c9925f013	743	/* now act on the message itself */
donatien	5:dd63a1e02b1b	744	switch (hdr->opcode) {
donatien	0:632c9925f013	745	/* ARP request? */
donatien	5:dd63a1e02b1b	746	case PP_HTONS(ARP_REQUEST):
donatien	0:632c9925f013	747	/* ARP request. If it asked for our address, we send out a
donatien	0:632c9925f013	748	* reply. In any case, we time-stamp any existing ARP entry,
donatien	0:632c9925f013	749	* and possiby send out an IP packet that was queued on it. */
donatien	0:632c9925f013	750
donatien	0:632c9925f013	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
donatien	0:632c9925f013	752	/* ARP request for our address? */
donatien	0:632c9925f013	753	if (for_us) {
donatien	0:632c9925f013	754
donatien	0:632c9925f013	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
donatien	0:632c9925f013	756	/* Re-use pbuf to send ARP reply.
donatien	0:632c9925f013	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
donatien	0:632c9925f013	758	that would allocate a new pbuf. */
donatien	0:632c9925f013	759	hdr->opcode = htons(ARP_REPLY);
donatien	0:632c9925f013	760
donatien	5:dd63a1e02b1b	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
donatien	5:dd63a1e02b1b	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
donatien	0:632c9925f013	763
donatien	0:632c9925f013	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:632c9925f013	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:632c9925f013	766	#if LWIP_AUTOIP
donatien	0:632c9925f013	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
donatien	0:632c9925f013	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
donatien	0:632c9925f013	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
donatien	0:632c9925f013	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
donatien	0:632c9925f013	771	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	772
donatien	5:dd63a1e02b1b	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
donatien	0:632c9925f013	774	#if LWIP_AUTOIP
donatien	5:dd63a1e02b1b	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
donatien	0:632c9925f013	776	#else /* LWIP_AUTOIP */
donatien	5:dd63a1e02b1b	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
donatien	0:632c9925f013	778	#endif /* LWIP_AUTOIP */
donatien	5:dd63a1e02b1b	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
donatien	5:dd63a1e02b1b	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
donatien	0:632c9925f013	781
donatien	0:632c9925f013	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
donatien	0:632c9925f013	783	are already correct, we tested that before */
donatien	0:632c9925f013	784
donatien	0:632c9925f013	785	/* return ARP reply */
donatien	0:632c9925f013	786	netif->linkoutput(netif, p);
donatien	0:632c9925f013	787	/* we are not configured? */
donatien	0:632c9925f013	788	} else if (ip_addr_isany(&netif->ip_addr)) {
donatien	0:632c9925f013	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
donatien	0:632c9925f013	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
donatien	0:632c9925f013	791	/* request was not directed to us */
donatien	0:632c9925f013	792	} else {
donatien	0:632c9925f013	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
donatien	0:632c9925f013	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
donatien	0:632c9925f013	795	}
donatien	0:632c9925f013	796	break;
donatien	5:dd63a1e02b1b	797	case PP_HTONS(ARP_REPLY):
donatien	0:632c9925f013	798	/* ARP reply. We already updated the ARP cache earlier. */
donatien	0:632c9925f013	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
donatien	0:632c9925f013	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
donatien	0:632c9925f013	801	/* DHCP wants to know about ARP replies from any host with an
donatien	0:632c9925f013	802	* IP address also offered to us by the DHCP server. We do not
donatien	0:632c9925f013	803	* want to take a duplicate IP address on a single network.
donatien	0:632c9925f013	804	* @todo How should we handle redundant (fail-over) interfaces? */
donatien	0:632c9925f013	805	dhcp_arp_reply(netif, &sipaddr);
donatien	0:632c9925f013	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
donatien	0:632c9925f013	807	break;
donatien	0:632c9925f013	808	default:
donatien	0:632c9925f013	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
donatien	0:632c9925f013	810	ETHARP_STATS_INC(etharp.err);
donatien	0:632c9925f013	811	break;
donatien	0:632c9925f013	812	}
donatien	0:632c9925f013	813	/* free ARP packet */
donatien	0:632c9925f013	814	pbuf_free(p);
donatien	0:632c9925f013	815	}
donatien	0:632c9925f013	816
donatien	0:632c9925f013	817	/**
donatien	0:632c9925f013	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
donatien	0:632c9925f013	819	*
donatien	0:632c9925f013	820	* For IP multicast and broadcast, corresponding Ethernet addresses
donatien	0:632c9925f013	821	* are selected and the packet is transmitted on the link.
donatien	0:632c9925f013	822	*
donatien	0:632c9925f013	823	* For unicast addresses, the packet is submitted to etharp_query(). In
donatien	0:632c9925f013	824	* case the IP address is outside the local network, the IP address of
donatien	0:632c9925f013	825	* the gateway is used.
donatien	0:632c9925f013	826	*
donatien	0:632c9925f013	827	* @param netif The lwIP network interface which the IP packet will be sent on.
donatien	0:632c9925f013	828	* @param q The pbuf(s) containing the IP packet to be sent.
donatien	0:632c9925f013	829	* @param ipaddr The IP address of the packet destination.
donatien	0:632c9925f013	830	*
donatien	0:632c9925f013	831	* @return
donatien	0:632c9925f013	832	* - ERR_RTE No route to destination (no gateway to external networks),
donatien	0:632c9925f013	833	* or the return type of either etharp_query() or etharp_send_ip().
donatien	0:632c9925f013	834	*/
donatien	0:632c9925f013	835	err_t
donatien	0:632c9925f013	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
donatien	0:632c9925f013	837	{
donatien	0:632c9925f013	838	struct eth_addr *dest, mcastaddr;
donatien	0:632c9925f013	839
donatien	0:632c9925f013	840	/* make room for Ethernet header - should not fail */
donatien	0:632c9925f013	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
donatien	0:632c9925f013	842	/* bail out */
donatien	0:632c9925f013	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	844	("etharp_output: could not allocate room for header.\n"));
donatien	0:632c9925f013	845	LINK_STATS_INC(link.lenerr);
donatien	0:632c9925f013	846	return ERR_BUF;
donatien	0:632c9925f013	847	}
donatien	0:632c9925f013	848
donatien	0:632c9925f013	849	/* assume unresolved Ethernet address */
donatien	0:632c9925f013	850	dest = NULL;
donatien	0:632c9925f013	851	/* Determine on destination hardware address. Broadcasts and multicasts
donatien	0:632c9925f013	852	* are special, other IP addresses are looked up in the ARP table. */
donatien	0:632c9925f013	853
donatien	0:632c9925f013	854	/* broadcast destination IP address? */
donatien	0:632c9925f013	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
donatien	0:632c9925f013	856	/* broadcast on Ethernet also */
donatien	0:632c9925f013	857	dest = (struct eth_addr *)&ethbroadcast;
donatien	0:632c9925f013	858	/* multicast destination IP address? */
donatien	0:632c9925f013	859	} else if (ip_addr_ismulticast(ipaddr)) {
donatien	0:632c9925f013	860	/* Hash IP multicast address to MAC address.*/
donatien	0:632c9925f013	861	mcastaddr.addr[0] = 0x01;
donatien	0:632c9925f013	862	mcastaddr.addr[1] = 0x00;
donatien	0:632c9925f013	863	mcastaddr.addr[2] = 0x5e;
donatien	0:632c9925f013	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
donatien	0:632c9925f013	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
donatien	0:632c9925f013	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
donatien	0:632c9925f013	867	/* destination Ethernet address is multicast */
donatien	0:632c9925f013	868	dest = &mcastaddr;
donatien	0:632c9925f013	869	/* unicast destination IP address? */
donatien	0:632c9925f013	870	} else {
donatien	0:632c9925f013	871	/* outside local network? */
donatien	0:632c9925f013	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
donatien	0:632c9925f013	873	!ip_addr_islinklocal(ipaddr)) {
donatien	0:632c9925f013	874	/* interface has default gateway? */
donatien	0:632c9925f013	875	if (!ip_addr_isany(&netif->gw)) {
donatien	0:632c9925f013	876	/* send to hardware address of default gateway IP address */
donatien	0:632c9925f013	877	ipaddr = &(netif->gw);
donatien	0:632c9925f013	878	/* no default gateway available */
donatien	0:632c9925f013	879	} else {
donatien	0:632c9925f013	880	/* no route to destination error (default gateway missing) */
donatien	0:632c9925f013	881	return ERR_RTE;
donatien	0:632c9925f013	882	}
donatien	0:632c9925f013	883	}
donatien	5:dd63a1e02b1b	884	#if LWIP_NETIF_HWADDRHINT
donatien	5:dd63a1e02b1b	885	if (netif->addr_hint != NULL) {
donatien	5:dd63a1e02b1b	886	/* per-pcb cached entry was given */
donatien	5:dd63a1e02b1b	887	u8_t etharp_cached_entry = *(netif->addr_hint);
donatien	5:dd63a1e02b1b	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
donatien	5:dd63a1e02b1b	889	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	5:dd63a1e02b1b	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
donatien	5:dd63a1e02b1b	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
donatien	5:dd63a1e02b1b	892	/* the per-pcb-cached entry is stable and the right one! */
donatien	5:dd63a1e02b1b	893	ETHARP_STATS_INC(etharp.cachehit);
donatien	5:dd63a1e02b1b	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
donatien	5:dd63a1e02b1b	895	&arp_table[etharp_cached_entry].ethaddr);
donatien	5:dd63a1e02b1b	896	}
donatien	5:dd63a1e02b1b	897	#if LWIP_NETIF_HWADDRHINT
donatien	5:dd63a1e02b1b	898	}
donatien	5:dd63a1e02b1b	899	}
donatien	5:dd63a1e02b1b	900	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	901	/* queue on destination Ethernet address belonging to ipaddr */
donatien	0:632c9925f013	902	return etharp_query(netif, ipaddr, q);
donatien	0:632c9925f013	903	}
donatien	0:632c9925f013	904
donatien	0:632c9925f013	905	/* continuation for multicast/broadcast destinations */
donatien	0:632c9925f013	906	/* obtain source Ethernet address of the given interface */
donatien	0:632c9925f013	907	/* send packet directly on the link */
donatien	0:632c9925f013	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
donatien	0:632c9925f013	909	}
donatien	0:632c9925f013	910
donatien	0:632c9925f013	911	/**
donatien	0:632c9925f013	912	* Send an ARP request for the given IP address and/or queue a packet.
donatien	0:632c9925f013	913	*
donatien	0:632c9925f013	914	* If the IP address was not yet in the cache, a pending ARP cache entry
donatien	0:632c9925f013	915	* is added and an ARP request is sent for the given address. The packet
donatien	0:632c9925f013	916	* is queued on this entry.
donatien	0:632c9925f013	917	*
donatien	0:632c9925f013	918	* If the IP address was already pending in the cache, a new ARP request
donatien	0:632c9925f013	919	* is sent for the given address. The packet is queued on this entry.
donatien	0:632c9925f013	920	*
donatien	0:632c9925f013	921	* If the IP address was already stable in the cache, and a packet is
donatien	0:632c9925f013	922	* given, it is directly sent and no ARP request is sent out.
donatien	0:632c9925f013	923	*
donatien	0:632c9925f013	924	* If the IP address was already stable in the cache, and no packet is
donatien	0:632c9925f013	925	* given, an ARP request is sent out.
donatien	0:632c9925f013	926	*
donatien	0:632c9925f013	927	* @param netif The lwIP network interface on which ipaddr
donatien	0:632c9925f013	928	* must be queried for.
donatien	0:632c9925f013	929	* @param ipaddr The IP address to be resolved.
donatien	0:632c9925f013	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
donatien	0:632c9925f013	931	* q is not freed by this function.
donatien	0:632c9925f013	932	*
donatien	0:632c9925f013	933	* @note q must only be ONE packet, not a packet queue!
donatien	0:632c9925f013	934	*
donatien	0:632c9925f013	935	* @return
donatien	0:632c9925f013	936	* - ERR_BUF Could not make room for Ethernet header.
donatien	0:632c9925f013	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
donatien	0:632c9925f013	938	* to query for address or queue the packet.
donatien	0:632c9925f013	939	* - ERR_MEM Could not queue packet due to memory shortage.
donatien	0:632c9925f013	940	* - ERR_RTE No route to destination (no gateway to external networks).
donatien	0:632c9925f013	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
donatien	0:632c9925f013	942	*
donatien	0:632c9925f013	943	*/
donatien	0:632c9925f013	944	err_t
donatien	0:632c9925f013	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
donatien	0:632c9925f013	946	{
donatien	0:632c9925f013	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
donatien	0:632c9925f013	948	err_t result = ERR_MEM;
donatien	0:632c9925f013	949	s8_t i; /* ARP entry index */
donatien	0:632c9925f013	950
donatien	0:632c9925f013	951	/* non-unicast address? */
donatien	0:632c9925f013	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
donatien	0:632c9925f013	953	ip_addr_ismulticast(ipaddr) \|\|
donatien	0:632c9925f013	954	ip_addr_isany(ipaddr)) {
donatien	0:632c9925f013	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
donatien	0:632c9925f013	956	return ERR_ARG;
donatien	0:632c9925f013	957	}
donatien	0:632c9925f013	958
donatien	0:632c9925f013	959	/* find entry in ARP cache, ask to create entry if queueing packet */
donatien	5:dd63a1e02b1b	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
donatien	0:632c9925f013	961
donatien	0:632c9925f013	962	/* could not find or create entry? */
donatien	0:632c9925f013	963	if (i < 0) {
donatien	0:632c9925f013	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
donatien	0:632c9925f013	965	if (q) {
donatien	0:632c9925f013	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
donatien	0:632c9925f013	967	ETHARP_STATS_INC(etharp.memerr);
donatien	0:632c9925f013	968	}
donatien	0:632c9925f013	969	return (err_t)i;
donatien	0:632c9925f013	970	}
donatien	0:632c9925f013	971
donatien	0:632c9925f013	972	/* mark a fresh entry as pending (we just sent a request) */
donatien	0:632c9925f013	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
donatien	0:632c9925f013	974	arp_table[i].state = ETHARP_STATE_PENDING;
donatien	0:632c9925f013	975	}
donatien	0:632c9925f013	976
donatien	0:632c9925f013	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
donatien	0:632c9925f013	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
donatien	0:632c9925f013	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
donatien	0:632c9925f013	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
donatien	0:632c9925f013	981
donatien	0:632c9925f013	982	/* do we have a pending entry? or an implicit query request? */
donatien	0:632c9925f013	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
donatien	0:632c9925f013	984	/* try to resolve it; send out ARP request */
donatien	0:632c9925f013	985	result = etharp_request(netif, ipaddr);
donatien	0:632c9925f013	986	if (result != ERR_OK) {
donatien	0:632c9925f013	987	/* ARP request couldn't be sent */
donatien	0:632c9925f013	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
donatien	0:632c9925f013	989	since this failure could be temporary, and the next packet calling
donatien	0:632c9925f013	990	etharp_query again could lead to sending the queued packets. */
donatien	0:632c9925f013	991	}
donatien	5:dd63a1e02b1b	992	if (q == NULL) {
donatien	5:dd63a1e02b1b	993	return result;
donatien	5:dd63a1e02b1b	994	}
donatien	0:632c9925f013	995	}
donatien	5:dd63a1e02b1b	996
donatien	0:632c9925f013	997	/* packet given? */
donatien	5:dd63a1e02b1b	998	LWIP_ASSERT("q != NULL", q != NULL);
donatien	5:dd63a1e02b1b	999	/* stable entry? */
donatien	5:dd63a1e02b1b	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	5:dd63a1e02b1b	1001	/* we have a valid IP->Ethernet address mapping */
donatien	5:dd63a1e02b1b	1002	ETHARP_SET_HINT(netif, i);
donatien	5:dd63a1e02b1b	1003	/* send the packet */
donatien	5:dd63a1e02b1b	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
donatien	5:dd63a1e02b1b	1005	/* pending entry? (either just created or already pending */
donatien	5:dd63a1e02b1b	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	0:632c9925f013	1007	#if ARP_QUEUEING /* queue the given q packet */
donatien	5:dd63a1e02b1b	1008	struct pbuf *p;
donatien	5:dd63a1e02b1b	1009	int copy_needed = 0;
donatien	5:dd63a1e02b1b	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
donatien	5:dd63a1e02b1b	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
donatien	5:dd63a1e02b1b	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
donatien	5:dd63a1e02b1b	1013	p = q;
donatien	5:dd63a1e02b1b	1014	while (p) {
donatien	5:dd63a1e02b1b	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
donatien	5:dd63a1e02b1b	1016	if(p->type != PBUF_ROM) {
donatien	5:dd63a1e02b1b	1017	copy_needed = 1;
donatien	5:dd63a1e02b1b	1018	break;
donatien	5:dd63a1e02b1b	1019	}
donatien	5:dd63a1e02b1b	1020	p = p->next;
donatien	5:dd63a1e02b1b	1021	}
donatien	5:dd63a1e02b1b	1022	if(copy_needed) {
donatien	5:dd63a1e02b1b	1023	/* copy the whole packet into new pbufs */
donatien	5:dd63a1e02b1b	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
donatien	5:dd63a1e02b1b	1025	if(p != NULL) {
donatien	5:dd63a1e02b1b	1026	if (pbuf_copy(p, q) != ERR_OK) {
donatien	5:dd63a1e02b1b	1027	pbuf_free(p);
donatien	5:dd63a1e02b1b	1028	p = NULL;
donatien	5:dd63a1e02b1b	1029	}
donatien	5:dd63a1e02b1b	1030	}
donatien	5:dd63a1e02b1b	1031	} else {
donatien	5:dd63a1e02b1b	1032	/* referencing the old pbuf is enough */
donatien	0:632c9925f013	1033	p = q;
donatien	5:dd63a1e02b1b	1034	pbuf_ref(p);
donatien	5:dd63a1e02b1b	1035	}
donatien	5:dd63a1e02b1b	1036	/* packet could be taken over? */
donatien	5:dd63a1e02b1b	1037	if (p != NULL) {
donatien	5:dd63a1e02b1b	1038	/* queue packet ... */
donatien	5:dd63a1e02b1b	1039	struct etharp_q_entry *new_entry;
donatien	5:dd63a1e02b1b	1040	/* allocate a new arp queue entry */
donatien	5:dd63a1e02b1b	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
donatien	5:dd63a1e02b1b	1042	if (new_entry != NULL) {
donatien	5:dd63a1e02b1b	1043	new_entry->next = 0;
donatien	5:dd63a1e02b1b	1044	new_entry->p = p;
donatien	5:dd63a1e02b1b	1045	if(arp_table[i].q != NULL) {
donatien	5:dd63a1e02b1b	1046	/* queue was already existent, append the new entry to the end */
donatien	5:dd63a1e02b1b	1047	struct etharp_q_entry *r;
donatien	5:dd63a1e02b1b	1048	r = arp_table[i].q;
donatien	5:dd63a1e02b1b	1049	while (r->next != NULL) {
donatien	5:dd63a1e02b1b	1050	r = r->next;
donatien	5:dd63a1e02b1b	1051	}
donatien	5:dd63a1e02b1b	1052	r->next = new_entry;
donatien	5:dd63a1e02b1b	1053	} else {
donatien	5:dd63a1e02b1b	1054	/* queue did not exist, first item in queue */
donatien	5:dd63a1e02b1b	1055	arp_table[i].q = new_entry;
donatien	0:632c9925f013	1056	}
donatien	5:dd63a1e02b1b	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	5:dd63a1e02b1b	1058	result = ERR_OK;
donatien	0:632c9925f013	1059	} else {
donatien	5:dd63a1e02b1b	1060	/* the pool MEMP_ARP_QUEUE is empty */
donatien	5:dd63a1e02b1b	1061	pbuf_free(p);
donatien	0:632c9925f013	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	0:632c9925f013	1063	/* { result == ERR_MEM } through initialization */
donatien	0:632c9925f013	1064	}
donatien	5:dd63a1e02b1b	1065	} else {
donatien	5:dd63a1e02b1b	1066	ETHARP_STATS_INC(etharp.memerr);
donatien	5:dd63a1e02b1b	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	0:632c9925f013	1068	/* { result == ERR_MEM } through initialization */
donatien	5:dd63a1e02b1b	1069	}
donatien	5:dd63a1e02b1b	1070	#else /* ARP_QUEUEING */
donatien	5:dd63a1e02b1b	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
donatien	5:dd63a1e02b1b	1072	/* { result == ERR_MEM } through initialization */
donatien	5:dd63a1e02b1b	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
donatien	0:632c9925f013	1074	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	1075	}
donatien	0:632c9925f013	1076	return result;
donatien	0:632c9925f013	1077	}
donatien	0:632c9925f013	1078
donatien	0:632c9925f013	1079	/**
donatien	0:632c9925f013	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
donatien	0:632c9925f013	1081	*
donatien	0:632c9925f013	1082	* @param netif the lwip network interface on which to send the ARP packet
donatien	0:632c9925f013	1083	* @param ethsrc_addr the source MAC address for the ethernet header
donatien	0:632c9925f013	1084	* @param ethdst_addr the destination MAC address for the ethernet header
donatien	0:632c9925f013	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
donatien	0:632c9925f013	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
donatien	0:632c9925f013	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
donatien	0:632c9925f013	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
donatien	0:632c9925f013	1089	* @param opcode the type of the ARP packet
donatien	0:632c9925f013	1090	* @return ERR_OK if the ARP packet has been sent
donatien	0:632c9925f013	1091	* ERR_MEM if the ARP packet couldn't be allocated
donatien	0:632c9925f013	1092	* any other err_t on failure
donatien	0:632c9925f013	1093	*/
donatien	0:632c9925f013	1094	#if !LWIP_AUTOIP
donatien	0:632c9925f013	1095	static
donatien	0:632c9925f013	1096	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	1097	err_t
donatien	0:632c9925f013	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
donatien	0:632c9925f013	1099	const struct eth_addr *ethdst_addr,
donatien	0:632c9925f013	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
donatien	0:632c9925f013	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
donatien	0:632c9925f013	1102	const u16_t opcode)
donatien	0:632c9925f013	1103	{
donatien	0:632c9925f013	1104	struct pbuf *p;
donatien	0:632c9925f013	1105	err_t result = ERR_OK;
donatien	0:632c9925f013	1106	struct eth_hdr *ethhdr;
donatien	0:632c9925f013	1107	struct etharp_hdr *hdr;
donatien	0:632c9925f013	1108	#if LWIP_AUTOIP
donatien	0:632c9925f013	1109	const u8_t * ethdst_hwaddr;
donatien	0:632c9925f013	1110	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	1111
donatien	0:632c9925f013	1112	/* allocate a pbuf for the outgoing ARP request packet */
donatien	0:632c9925f013	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
donatien	0:632c9925f013	1114	/* could allocate a pbuf for an ARP request? */
donatien	0:632c9925f013	1115	if (p == NULL) {
donatien	0:632c9925f013	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
donatien	0:632c9925f013	1118	ETHARP_STATS_INC(etharp.memerr);
donatien	0:632c9925f013	1119	return ERR_MEM;
donatien	0:632c9925f013	1120	}
donatien	0:632c9925f013	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
donatien	0:632c9925f013	1122	(p->len >= SIZEOF_ETHARP_PACKET));
donatien	0:632c9925f013	1123
donatien	0:632c9925f013	1124	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
donatien	0:632c9925f013	1127	hdr->opcode = htons(opcode);
donatien	0:632c9925f013	1128
donatien	0:632c9925f013	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:632c9925f013	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:632c9925f013	1131	#if LWIP_AUTOIP
donatien	0:632c9925f013	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
donatien	0:632c9925f013	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
donatien	0:632c9925f013	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
donatien	0:632c9925f013	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
donatien	0:632c9925f013	1136	#endif /* LWIP_AUTOIP */
donatien	5:dd63a1e02b1b	1137	/* Write the ARP MAC-Addresses */
donatien	5:dd63a1e02b1b	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
donatien	5:dd63a1e02b1b	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
donatien	5:dd63a1e02b1b	1140	/* Write the Ethernet MAC-Addresses */
donatien	0:632c9925f013	1141	#if LWIP_AUTOIP
donatien	5:dd63a1e02b1b	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
donatien	0:632c9925f013	1143	#else /* LWIP_AUTOIP */
donatien	5:dd63a1e02b1b	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
donatien	0:632c9925f013	1145	#endif /* LWIP_AUTOIP */
donatien	5:dd63a1e02b1b	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
donatien	0:632c9925f013	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
donatien	0:632c9925f013	1148	* structure packing. */
donatien	5:dd63a1e02b1b	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
donatien	5:dd63a1e02b1b	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
donatien	0:632c9925f013	1151
donatien	5:dd63a1e02b1b	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
donatien	5:dd63a1e02b1b	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
donatien	5:dd63a1e02b1b	1154	/* set hwlen and protolen */
donatien	5:dd63a1e02b1b	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
donatien	5:dd63a1e02b1b	1156	hdr->protolen = sizeof(ip_addr_t);
donatien	0:632c9925f013	1157
donatien	5:dd63a1e02b1b	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
donatien	0:632c9925f013	1159	/* send ARP query */
donatien	0:632c9925f013	1160	result = netif->linkoutput(netif, p);
donatien	0:632c9925f013	1161	ETHARP_STATS_INC(etharp.xmit);
donatien	0:632c9925f013	1162	/* free ARP query packet */
donatien	0:632c9925f013	1163	pbuf_free(p);
donatien	0:632c9925f013	1164	p = NULL;
donatien	0:632c9925f013	1165	/* could not allocate pbuf for ARP request */
donatien	0:632c9925f013	1166
donatien	0:632c9925f013	1167	return result;
donatien	0:632c9925f013	1168	}
donatien	0:632c9925f013	1169
donatien	0:632c9925f013	1170	/**
donatien	0:632c9925f013	1171	* Send an ARP request packet asking for ipaddr.
donatien	0:632c9925f013	1172	*
donatien	0:632c9925f013	1173	* @param netif the lwip network interface on which to send the request
donatien	0:632c9925f013	1174	* @param ipaddr the IP address for which to ask
donatien	0:632c9925f013	1175	* @return ERR_OK if the request has been sent
donatien	0:632c9925f013	1176	* ERR_MEM if the ARP packet couldn't be allocated
donatien	0:632c9925f013	1177	* any other err_t on failure
donatien	0:632c9925f013	1178	*/
donatien	0:632c9925f013	1179	err_t
donatien	0:632c9925f013	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
donatien	0:632c9925f013	1181	{
donatien	0:632c9925f013	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
donatien	0:632c9925f013	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
donatien	0:632c9925f013	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
donatien	0:632c9925f013	1185	ipaddr, ARP_REQUEST);
donatien	0:632c9925f013	1186	}
donatien	0:632c9925f013	1187	#endif /* LWIP_ARP */
donatien	0:632c9925f013	1188
donatien	0:632c9925f013	1189	/**
donatien	0:632c9925f013	1190	* Process received ethernet frames. Using this function instead of directly
donatien	0:632c9925f013	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
donatien	0:632c9925f013	1192	* the ARP cache is protected from concurrent access.
donatien	0:632c9925f013	1193	*
donatien	0:632c9925f013	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
donatien	0:632c9925f013	1195	* @param netif the network interface on which the packet was received
donatien	0:632c9925f013	1196	*/
donatien	0:632c9925f013	1197	err_t
donatien	0:632c9925f013	1198	ethernet_input(struct pbuf p, struct netif netif)
donatien	0:632c9925f013	1199	{
donatien	0:632c9925f013	1200	struct eth_hdr* ethhdr;
donatien	0:632c9925f013	1201	u16_t type;
donatien	0:632c9925f013	1202
donatien	0:632c9925f013	1203	/* points to packet payload, which starts with an Ethernet header */
donatien	0:632c9925f013	1204	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
donatien	0:632c9925f013	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	0:632c9925f013	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
donatien	0:632c9925f013	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
donatien	0:632c9925f013	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
donatien	0:632c9925f013	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
donatien	0:632c9925f013	1211	(unsigned)htons(ethhdr->type)));
donatien	0:632c9925f013	1212
donatien	5:dd63a1e02b1b	1213	type = ethhdr->type;
donatien	0:632c9925f013	1214	#if ETHARP_SUPPORT_VLAN
donatien	5:dd63a1e02b1b	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
donatien	0:632c9925f013	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
donatien	0:632c9925f013	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
donatien	0:632c9925f013	1219	/* silently ignore this packet: not for our VLAN */
donatien	0:632c9925f013	1220	pbuf_free(p);
donatien	0:632c9925f013	1221	return ERR_OK;
donatien	0:632c9925f013	1222	}
donatien	0:632c9925f013	1223	#endif /* ETHARP_VLAN_CHECK */
donatien	5:dd63a1e02b1b	1224	type = vlan->tpid;
donatien	0:632c9925f013	1225	}
donatien	0:632c9925f013	1226	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:632c9925f013	1227
donatien	5:dd63a1e02b1b	1228	#if LWIP_ARP_FILTER_NETIF
donatien	5:dd63a1e02b1b	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
donatien	5:dd63a1e02b1b	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
donatien	5:dd63a1e02b1b	1231
donatien	0:632c9925f013	1232	switch (type) {
donatien	0:632c9925f013	1233	#if LWIP_ARP
donatien	0:632c9925f013	1234	/* IP packet? */
donatien	5:dd63a1e02b1b	1235	case PP_HTONS(ETHTYPE_IP):
donatien	0:632c9925f013	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
donatien	0:632c9925f013	1237	goto free_and_return;
donatien	0:632c9925f013	1238	}
donatien	0:632c9925f013	1239	#if ETHARP_TRUST_IP_MAC
donatien	0:632c9925f013	1240	/* update ARP table */
donatien	0:632c9925f013	1241	etharp_ip_input(netif, p);
donatien	0:632c9925f013	1242	#endif /* ETHARP_TRUST_IP_MAC */
donatien	0:632c9925f013	1243	/* skip Ethernet header */
donatien	0:632c9925f013	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
donatien	0:632c9925f013	1245	LWIP_ASSERT("Can't move over header in packet", 0);
donatien	0:632c9925f013	1246	goto free_and_return;
donatien	0:632c9925f013	1247	} else {
donatien	0:632c9925f013	1248	/* pass to IP layer */
donatien	0:632c9925f013	1249	ip_input(p, netif);
donatien	0:632c9925f013	1250	}
donatien	0:632c9925f013	1251	break;
donatien	0:632c9925f013	1252
donatien	5:dd63a1e02b1b	1253	case PP_HTONS(ETHTYPE_ARP):
donatien	0:632c9925f013	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
donatien	0:632c9925f013	1255	goto free_and_return;
donatien	0:632c9925f013	1256	}
donatien	0:632c9925f013	1257	/* pass p to ARP module */
donatien	0:632c9925f013	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
donatien	0:632c9925f013	1259	break;
donatien	0:632c9925f013	1260	#endif /* LWIP_ARP */
donatien	0:632c9925f013	1261	#if PPPOE_SUPPORT
donatien	5:dd63a1e02b1b	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
donatien	0:632c9925f013	1263	pppoe_disc_input(netif, p);
donatien	0:632c9925f013	1264	break;
donatien	0:632c9925f013	1265
donatien	5:dd63a1e02b1b	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
donatien	0:632c9925f013	1267	pppoe_data_input(netif, p);
donatien	0:632c9925f013	1268	break;
donatien	0:632c9925f013	1269	#endif /* PPPOE_SUPPORT */
donatien	0:632c9925f013	1270
donatien	0:632c9925f013	1271	default:
donatien	0:632c9925f013	1272	ETHARP_STATS_INC(etharp.proterr);
donatien	0:632c9925f013	1273	ETHARP_STATS_INC(etharp.drop);
donatien	0:632c9925f013	1274	goto free_and_return;
donatien	0:632c9925f013	1275	}
donatien	0:632c9925f013	1276
donatien	0:632c9925f013	1277	/* This means the pbuf is freed or consumed,
donatien	0:632c9925f013	1278	so the caller doesn't have to free it again */
donatien	0:632c9925f013	1279	return ERR_OK;
donatien	0:632c9925f013	1280
donatien	0:632c9925f013	1281	free_and_return:
donatien	0:632c9925f013	1282	pbuf_free(p);
donatien	0:632c9925f013	1283	return ERR_OK;
donatien	0:632c9925f013	1284	}
donatien	0:632c9925f013	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Program
Created:	11 Jun 2010
Imports:	2654
Forks:	0
Commits:	12
Dependents:	3
Dependencies:	0
Followers:	13

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lwip/netif/etharp.c@5:dd63a1e02b1b, 2010-07-27 (annotated)

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