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NetServices/lwip/netif/etharp.c@0:d9266031f832, 2011-10-13 (annotated)

Committer:: mafischl
Date:: Thu Oct 13 17:02:29 2011 +0000
Revision:: 0:d9266031f832

Who changed what in which revision?

User	Revision	Line number	New contents of line
mafischl	0:d9266031f832	1	/**
mafischl	0:d9266031f832	2	* @file
mafischl	0:d9266031f832	3	* Address Resolution Protocol module for IP over Ethernet
mafischl	0:d9266031f832	4	*
mafischl	0:d9266031f832	5	* Functionally, ARP is divided into two parts. The first maps an IP address
mafischl	0:d9266031f832	6	* to a physical address when sending a packet, and the second part answers
mafischl	0:d9266031f832	7	* requests from other machines for our physical address.
mafischl	0:d9266031f832	8	*
mafischl	0:d9266031f832	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
mafischl	0:d9266031f832	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
mafischl	0:d9266031f832	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
mafischl	0:d9266031f832	12	*/
mafischl	0:d9266031f832	13
mafischl	0:d9266031f832	14	/*
mafischl	0:d9266031f832	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
mafischl	0:d9266031f832	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
mafischl	0:d9266031f832	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
mafischl	0:d9266031f832	18	* All rights reserved.
mafischl	0:d9266031f832	19	*
mafischl	0:d9266031f832	20	* Redistribution and use in source and binary forms, with or without modification,
mafischl	0:d9266031f832	21	* are permitted provided that the following conditions are met:
mafischl	0:d9266031f832	22	*
mafischl	0:d9266031f832	23	* 1. Redistributions of source code must retain the above copyright notice,
mafischl	0:d9266031f832	24	* this list of conditions and the following disclaimer.
mafischl	0:d9266031f832	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
mafischl	0:d9266031f832	26	* this list of conditions and the following disclaimer in the documentation
mafischl	0:d9266031f832	27	* and/or other materials provided with the distribution.
mafischl	0:d9266031f832	28	* 3. The name of the author may not be used to endorse or promote products
mafischl	0:d9266031f832	29	* derived from this software without specific prior written permission.
mafischl	0:d9266031f832	30	*
mafischl	0:d9266031f832	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mafischl	0:d9266031f832	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mafischl	0:d9266031f832	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mafischl	0:d9266031f832	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mafischl	0:d9266031f832	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mafischl	0:d9266031f832	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mafischl	0:d9266031f832	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mafischl	0:d9266031f832	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mafischl	0:d9266031f832	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mafischl	0:d9266031f832	40	* OF SUCH DAMAGE.
mafischl	0:d9266031f832	41	*
mafischl	0:d9266031f832	42	* This file is part of the lwIP TCP/IP stack.
mafischl	0:d9266031f832	43	*
mafischl	0:d9266031f832	44	*/
mafischl	0:d9266031f832	45
mafischl	0:d9266031f832	46	#include "lwip/opt.h"
mafischl	0:d9266031f832	47
mafischl	0:d9266031f832	48	#if LWIP_ARP \|\| LWIP_ETHERNET
mafischl	0:d9266031f832	49
mafischl	0:d9266031f832	50	#include "lwip/ip_addr.h"
mafischl	0:d9266031f832	51	#include "lwip/def.h"
mafischl	0:d9266031f832	52	#include "lwip/ip.h"
mafischl	0:d9266031f832	53	#include "lwip/stats.h"
mafischl	0:d9266031f832	54	#include "lwip/snmp.h"
mafischl	0:d9266031f832	55	#include "lwip/dhcp.h"
mafischl	0:d9266031f832	56	#include "lwip/autoip.h"
mafischl	0:d9266031f832	57	#include "netif/etharp.h"
mafischl	0:d9266031f832	58
mafischl	0:d9266031f832	59	#if PPPOE_SUPPORT
mafischl	0:d9266031f832	60	#include "netif/ppp_oe.h"
mafischl	0:d9266031f832	61	#endif /* PPPOE_SUPPORT */
mafischl	0:d9266031f832	62
mafischl	0:d9266031f832	63	#include <string.h>
mafischl	0:d9266031f832	64
mafischl	0:d9266031f832	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
mafischl	0:d9266031f832	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
mafischl	0:d9266031f832	67
mafischl	0:d9266031f832	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
mafischl	0:d9266031f832	69
mafischl	0:d9266031f832	70	/** the time an ARP entry stays valid after its last update,
mafischl	0:d9266031f832	71	* for ARP_TMR_INTERVAL = 5000, this is
mafischl	0:d9266031f832	72	* (240 * 5) seconds = 20 minutes.
mafischl	0:d9266031f832	73	*/
mafischl	0:d9266031f832	74	#define ARP_MAXAGE 240
mafischl	0:d9266031f832	75	/** the time an ARP entry stays pending after first request,
mafischl	0:d9266031f832	76	* for ARP_TMR_INTERVAL = 5000, this is
mafischl	0:d9266031f832	77	* (2 * 5) seconds = 10 seconds.
mafischl	0:d9266031f832	78	*
mafischl	0:d9266031f832	79	* @internal Keep this number at least 2, otherwise it might
mafischl	0:d9266031f832	80	* run out instantly if the timeout occurs directly after a request.
mafischl	0:d9266031f832	81	*/
mafischl	0:d9266031f832	82	#define ARP_MAXPENDING 2
mafischl	0:d9266031f832	83
mafischl	0:d9266031f832	84	#define HWTYPE_ETHERNET 1
mafischl	0:d9266031f832	85
mafischl	0:d9266031f832	86	enum etharp_state {
mafischl	0:d9266031f832	87	ETHARP_STATE_EMPTY = 0,
mafischl	0:d9266031f832	88	ETHARP_STATE_PENDING,
mafischl	0:d9266031f832	89	ETHARP_STATE_STABLE
mafischl	0:d9266031f832	90	};
mafischl	0:d9266031f832	91
mafischl	0:d9266031f832	92	struct etharp_entry {
mafischl	0:d9266031f832	93	#if ARP_QUEUEING
mafischl	0:d9266031f832	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
mafischl	0:d9266031f832	95	struct etharp_q_entry *q;
mafischl	0:d9266031f832	96	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	97	ip_addr_t ipaddr;
mafischl	0:d9266031f832	98	struct eth_addr ethaddr;
mafischl	0:d9266031f832	99	#if LWIP_SNMP
mafischl	0:d9266031f832	100	struct netif *netif;
mafischl	0:d9266031f832	101	#endif /* LWIP_SNMP */
mafischl	0:d9266031f832	102	u8_t state;
mafischl	0:d9266031f832	103	u8_t ctime;
mafischl	0:d9266031f832	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	105	u8_t static_entry;
mafischl	0:d9266031f832	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	107	};
mafischl	0:d9266031f832	108
mafischl	0:d9266031f832	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
mafischl	0:d9266031f832	110
mafischl	0:d9266031f832	111	#if !LWIP_NETIF_HWADDRHINT
mafischl	0:d9266031f832	112	static u8_t etharp_cached_entry;
mafischl	0:d9266031f832	113	#endif /* !LWIP_NETIF_HWADDRHINT */
mafischl	0:d9266031f832	114
mafischl	0:d9266031f832	115	/** Try hard to create a new entry - we want the IP address to appear in
mafischl	0:d9266031f832	116	the cache (even if this means removing an active entry or so). */
mafischl	0:d9266031f832	117	#define ETHARP_FLAG_TRY_HARD 1
mafischl	0:d9266031f832	118	#define ETHARP_FLAG_FIND_ONLY 2
mafischl	0:d9266031f832	119	#define ETHARP_FLAG_STATIC_ENTRY 4
mafischl	0:d9266031f832	120
mafischl	0:d9266031f832	121	#if LWIP_NETIF_HWADDRHINT
mafischl	0:d9266031f832	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
mafischl	0:d9266031f832	123	*((netif)->addr_hint) = (hint);
mafischl	0:d9266031f832	124	#else /* LWIP_NETIF_HWADDRHINT */
mafischl	0:d9266031f832	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
mafischl	0:d9266031f832	126	#endif /* LWIP_NETIF_HWADDRHINT */
mafischl	0:d9266031f832	127
mafischl	0:d9266031f832	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
mafischl	0:d9266031f832	129
mafischl	0:d9266031f832	130
mafischl	0:d9266031f832	131	/* Some checks, instead of etharp_init(): */
mafischl	0:d9266031f832	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
mafischl	0:d9266031f832	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
mafischl	0:d9266031f832	134	#endif
mafischl	0:d9266031f832	135
mafischl	0:d9266031f832	136
mafischl	0:d9266031f832	137	#if ARP_QUEUEING
mafischl	0:d9266031f832	138	/**
mafischl	0:d9266031f832	139	* Free a complete queue of etharp entries
mafischl	0:d9266031f832	140	*
mafischl	0:d9266031f832	141	* @param q a qeueue of etharp_q_entry's to free
mafischl	0:d9266031f832	142	*/
mafischl	0:d9266031f832	143	static void
mafischl	0:d9266031f832	144	free_etharp_q(struct etharp_q_entry *q)
mafischl	0:d9266031f832	145	{
mafischl	0:d9266031f832	146	struct etharp_q_entry *r;
mafischl	0:d9266031f832	147	LWIP_ASSERT("q != NULL", q != NULL);
mafischl	0:d9266031f832	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
mafischl	0:d9266031f832	149	while (q) {
mafischl	0:d9266031f832	150	r = q;
mafischl	0:d9266031f832	151	q = q->next;
mafischl	0:d9266031f832	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
mafischl	0:d9266031f832	153	pbuf_free(r->p);
mafischl	0:d9266031f832	154	memp_free(MEMP_ARP_QUEUE, r);
mafischl	0:d9266031f832	155	}
mafischl	0:d9266031f832	156	}
mafischl	0:d9266031f832	157	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	158
mafischl	0:d9266031f832	159	/** Clean up ARP table entries */
mafischl	0:d9266031f832	160	static void
mafischl	0:d9266031f832	161	free_entry(int i)
mafischl	0:d9266031f832	162	{
mafischl	0:d9266031f832	163	/* remove from SNMP ARP index tree */
mafischl	0:d9266031f832	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
mafischl	0:d9266031f832	165	#if ARP_QUEUEING
mafischl	0:d9266031f832	166	/* and empty packet queue */
mafischl	0:d9266031f832	167	if (arp_table[i].q != NULL) {
mafischl	0:d9266031f832	168	/* remove all queued packets */
mafischl	0:d9266031f832	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
mafischl	0:d9266031f832	170	free_etharp_q(arp_table[i].q);
mafischl	0:d9266031f832	171	arp_table[i].q = NULL;
mafischl	0:d9266031f832	172	}
mafischl	0:d9266031f832	173	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	174	/* recycle entry for re-use */
mafischl	0:d9266031f832	175	arp_table[i].state = ETHARP_STATE_EMPTY;
mafischl	0:d9266031f832	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	177	arp_table[i].static_entry = 0;
mafischl	0:d9266031f832	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	179	#ifdef LWIP_DEBUG
mafischl	0:d9266031f832	180	/* for debugging, clean out the complete entry */
mafischl	0:d9266031f832	181	arp_table[i].ctime = 0;
mafischl	0:d9266031f832	182	#if LWIP_SNMP
mafischl	0:d9266031f832	183	arp_table[i].netif = NULL;
mafischl	0:d9266031f832	184	#endif /* LWIP_SNMP */
mafischl	0:d9266031f832	185	ip_addr_set_zero(&arp_table[i].ipaddr);
mafischl	0:d9266031f832	186	arp_table[i].ethaddr = ethzero;
mafischl	0:d9266031f832	187	#endif /* LWIP_DEBUG */
mafischl	0:d9266031f832	188	}
mafischl	0:d9266031f832	189
mafischl	0:d9266031f832	190	/**
mafischl	0:d9266031f832	191	* Clears expired entries in the ARP table.
mafischl	0:d9266031f832	192	*
mafischl	0:d9266031f832	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
mafischl	0:d9266031f832	194	* in order to expire entries in the ARP table.
mafischl	0:d9266031f832	195	*/
mafischl	0:d9266031f832	196	void
mafischl	0:d9266031f832	197	etharp_tmr(void)
mafischl	0:d9266031f832	198	{
mafischl	0:d9266031f832	199	u8_t i;
mafischl	0:d9266031f832	200
mafischl	0:d9266031f832	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
mafischl	0:d9266031f832	202	/* remove expired entries from the ARP table */
mafischl	0:d9266031f832	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
mafischl	0:d9266031f832	204	u8_t state = arp_table[i].state;
mafischl	0:d9266031f832	205	if (state != ETHARP_STATE_EMPTY
mafischl	0:d9266031f832	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	207	&& (arp_table[i].static_entry == 0)
mafischl	0:d9266031f832	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	209	) {
mafischl	0:d9266031f832	210	arp_table[i].ctime++;
mafischl	0:d9266031f832	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
mafischl	0:d9266031f832	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
mafischl	0:d9266031f832	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
mafischl	0:d9266031f832	214	/* pending or stable entry has become old! */
mafischl	0:d9266031f832	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
mafischl	0:d9266031f832	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
mafischl	0:d9266031f832	217	/* clean up entries that have just been expired */
mafischl	0:d9266031f832	218	free_entry(i);
mafischl	0:d9266031f832	219	}
mafischl	0:d9266031f832	220	#if ARP_QUEUEING
mafischl	0:d9266031f832	221	/* still pending entry? (not expired) */
mafischl	0:d9266031f832	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
mafischl	0:d9266031f832	223	/* resend an ARP query here? */
mafischl	0:d9266031f832	224	}
mafischl	0:d9266031f832	225	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	226	}
mafischl	0:d9266031f832	227	}
mafischl	0:d9266031f832	228	}
mafischl	0:d9266031f832	229
mafischl	0:d9266031f832	230	/**
mafischl	0:d9266031f832	231	* Search the ARP table for a matching or new entry.
mafischl	0:d9266031f832	232	*
mafischl	0:d9266031f832	233	* If an IP address is given, return a pending or stable ARP entry that matches
mafischl	0:d9266031f832	234	* the address. If no match is found, create a new entry with this address set,
mafischl	0:d9266031f832	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
mafischl	0:d9266031f832	236	* state of the returned entry.
mafischl	0:d9266031f832	237	*
mafischl	0:d9266031f832	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
mafischl	0:d9266031f832	239	*
mafischl	0:d9266031f832	240	* In all cases, attempt to create new entries from an empty entry. If no
mafischl	0:d9266031f832	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
mafischl	0:d9266031f832	242	* old entries. Heuristic choose the least important entry for recycling.
mafischl	0:d9266031f832	243	*
mafischl	0:d9266031f832	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
mafischl	0:d9266031f832	245	* @param flags @see definition of ETHARP_FLAG_*
mafischl	0:d9266031f832	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
mafischl	0:d9266031f832	247	*
mafischl	0:d9266031f832	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
mafischl	0:d9266031f832	249	* entry is found or could be recycled.
mafischl	0:d9266031f832	250	*/
mafischl	0:d9266031f832	251	static s8_t
mafischl	0:d9266031f832	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
mafischl	0:d9266031f832	253	{
mafischl	0:d9266031f832	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
mafischl	0:d9266031f832	255	s8_t empty = ARP_TABLE_SIZE;
mafischl	0:d9266031f832	256	u8_t i = 0, age_pending = 0, age_stable = 0;
mafischl	0:d9266031f832	257	#if ARP_QUEUEING
mafischl	0:d9266031f832	258	/* oldest entry with packets on queue */
mafischl	0:d9266031f832	259	s8_t old_queue = ARP_TABLE_SIZE;
mafischl	0:d9266031f832	260	/* its age */
mafischl	0:d9266031f832	261	u8_t age_queue = 0;
mafischl	0:d9266031f832	262	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	263
mafischl	0:d9266031f832	264	/**
mafischl	0:d9266031f832	265	* a) do a search through the cache, remember candidates
mafischl	0:d9266031f832	266	* b) select candidate entry
mafischl	0:d9266031f832	267	* c) create new entry
mafischl	0:d9266031f832	268	*/
mafischl	0:d9266031f832	269
mafischl	0:d9266031f832	270	/* a) in a single search sweep, do all of this
mafischl	0:d9266031f832	271	* 1) remember the first empty entry (if any)
mafischl	0:d9266031f832	272	* 2) remember the oldest stable entry (if any)
mafischl	0:d9266031f832	273	* 3) remember the oldest pending entry without queued packets (if any)
mafischl	0:d9266031f832	274	* 4) remember the oldest pending entry with queued packets (if any)
mafischl	0:d9266031f832	275	* 5) search for a matching IP entry, either pending or stable
mafischl	0:d9266031f832	276	* until 5 matches, or all entries are searched for.
mafischl	0:d9266031f832	277	*/
mafischl	0:d9266031f832	278
mafischl	0:d9266031f832	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
mafischl	0:d9266031f832	280	u8_t state = arp_table[i].state;
mafischl	0:d9266031f832	281	/* no empty entry found yet and now we do find one? */
mafischl	0:d9266031f832	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
mafischl	0:d9266031f832	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
mafischl	0:d9266031f832	284	/* remember first empty entry */
mafischl	0:d9266031f832	285	empty = i;
mafischl	0:d9266031f832	286	} else if (state != ETHARP_STATE_EMPTY) {
mafischl	0:d9266031f832	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
mafischl	0:d9266031f832	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
mafischl	0:d9266031f832	289	/* if given, does IP address match IP address in ARP entry? */
mafischl	0:d9266031f832	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
mafischl	0:d9266031f832	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
mafischl	0:d9266031f832	292	/* found exact IP address match, simply bail out */
mafischl	0:d9266031f832	293	return i;
mafischl	0:d9266031f832	294	}
mafischl	0:d9266031f832	295	/* pending entry? */
mafischl	0:d9266031f832	296	if (state == ETHARP_STATE_PENDING) {
mafischl	0:d9266031f832	297	/* pending with queued packets? */
mafischl	0:d9266031f832	298	#if ARP_QUEUEING
mafischl	0:d9266031f832	299	if (arp_table[i].q != NULL) {
mafischl	0:d9266031f832	300	if (arp_table[i].ctime >= age_queue) {
mafischl	0:d9266031f832	301	old_queue = i;
mafischl	0:d9266031f832	302	age_queue = arp_table[i].ctime;
mafischl	0:d9266031f832	303	}
mafischl	0:d9266031f832	304	} else
mafischl	0:d9266031f832	305	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	306	/* pending without queued packets? */
mafischl	0:d9266031f832	307	{
mafischl	0:d9266031f832	308	if (arp_table[i].ctime >= age_pending) {
mafischl	0:d9266031f832	309	old_pending = i;
mafischl	0:d9266031f832	310	age_pending = arp_table[i].ctime;
mafischl	0:d9266031f832	311	}
mafischl	0:d9266031f832	312	}
mafischl	0:d9266031f832	313	/* stable entry? */
mafischl	0:d9266031f832	314	} else if (state == ETHARP_STATE_STABLE) {
mafischl	0:d9266031f832	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	316	/* don't record old_stable for static entries since they never expire */
mafischl	0:d9266031f832	317	if (arp_table[i].static_entry == 0)
mafischl	0:d9266031f832	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	319	{
mafischl	0:d9266031f832	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
mafischl	0:d9266031f832	321	if (arp_table[i].ctime >= age_stable) {
mafischl	0:d9266031f832	322	old_stable = i;
mafischl	0:d9266031f832	323	age_stable = arp_table[i].ctime;
mafischl	0:d9266031f832	324	}
mafischl	0:d9266031f832	325	}
mafischl	0:d9266031f832	326	}
mafischl	0:d9266031f832	327	}
mafischl	0:d9266031f832	328	}
mafischl	0:d9266031f832	329	/* { we have no match } => try to create a new entry */
mafischl	0:d9266031f832	330
mafischl	0:d9266031f832	331	/* don't create new entry, only search? */
mafischl	0:d9266031f832	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
mafischl	0:d9266031f832	333	/* or no empty entry found and not allowed to recycle? */
mafischl	0:d9266031f832	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
mafischl	0:d9266031f832	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
mafischl	0:d9266031f832	336	return (s8_t)ERR_MEM;
mafischl	0:d9266031f832	337	}
mafischl	0:d9266031f832	338
mafischl	0:d9266031f832	339	/* b) choose the least destructive entry to recycle:
mafischl	0:d9266031f832	340	* 1) empty entry
mafischl	0:d9266031f832	341	* 2) oldest stable entry
mafischl	0:d9266031f832	342	* 3) oldest pending entry without queued packets
mafischl	0:d9266031f832	343	* 4) oldest pending entry with queued packets
mafischl	0:d9266031f832	344	*
mafischl	0:d9266031f832	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
mafischl	0:d9266031f832	346	*/
mafischl	0:d9266031f832	347
mafischl	0:d9266031f832	348	/* 1) empty entry available? */
mafischl	0:d9266031f832	349	if (empty < ARP_TABLE_SIZE) {
mafischl	0:d9266031f832	350	i = empty;
mafischl	0:d9266031f832	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
mafischl	0:d9266031f832	352	} else {
mafischl	0:d9266031f832	353	/* 2) found recyclable stable entry? */
mafischl	0:d9266031f832	354	if (old_stable < ARP_TABLE_SIZE) {
mafischl	0:d9266031f832	355	/* recycle oldest stable*/
mafischl	0:d9266031f832	356	i = old_stable;
mafischl	0:d9266031f832	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
mafischl	0:d9266031f832	358	#if ARP_QUEUEING
mafischl	0:d9266031f832	359	/* no queued packets should exist on stable entries */
mafischl	0:d9266031f832	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
mafischl	0:d9266031f832	361	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	362	/* 3) found recyclable pending entry without queued packets? */
mafischl	0:d9266031f832	363	} else if (old_pending < ARP_TABLE_SIZE) {
mafischl	0:d9266031f832	364	/* recycle oldest pending */
mafischl	0:d9266031f832	365	i = old_pending;
mafischl	0:d9266031f832	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
mafischl	0:d9266031f832	367	#if ARP_QUEUEING
mafischl	0:d9266031f832	368	/* 4) found recyclable pending entry with queued packets? */
mafischl	0:d9266031f832	369	} else if (old_queue < ARP_TABLE_SIZE) {
mafischl	0:d9266031f832	370	/* recycle oldest pending (queued packets are free in free_entry) */
mafischl	0:d9266031f832	371	i = old_queue;
mafischl	0:d9266031f832	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)));
mafischl	0:d9266031f832	373	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	374	/* no empty or recyclable entries found */
mafischl	0:d9266031f832	375	} else {
mafischl	0:d9266031f832	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
mafischl	0:d9266031f832	377	return (s8_t)ERR_MEM;
mafischl	0:d9266031f832	378	}
mafischl	0:d9266031f832	379
mafischl	0:d9266031f832	380	/* { empty or recyclable entry found } */
mafischl	0:d9266031f832	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
mafischl	0:d9266031f832	382	free_entry(i);
mafischl	0:d9266031f832	383	}
mafischl	0:d9266031f832	384
mafischl	0:d9266031f832	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
mafischl	0:d9266031f832	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
mafischl	0:d9266031f832	387	arp_table[i].state == ETHARP_STATE_EMPTY);
mafischl	0:d9266031f832	388
mafischl	0:d9266031f832	389	/* IP address given? */
mafischl	0:d9266031f832	390	if (ipaddr != NULL) {
mafischl	0:d9266031f832	391	/* set IP address */
mafischl	0:d9266031f832	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
mafischl	0:d9266031f832	393	}
mafischl	0:d9266031f832	394	arp_table[i].ctime = 0;
mafischl	0:d9266031f832	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	396	arp_table[i].static_entry = 0;
mafischl	0:d9266031f832	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	398	return (err_t)i;
mafischl	0:d9266031f832	399	}
mafischl	0:d9266031f832	400
mafischl	0:d9266031f832	401	/**
mafischl	0:d9266031f832	402	* Send an IP packet on the network using netif->linkoutput
mafischl	0:d9266031f832	403	* The ethernet header is filled in before sending.
mafischl	0:d9266031f832	404	*
mafischl	0:d9266031f832	405	* @params netif the lwIP network interface on which to send the packet
mafischl	0:d9266031f832	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
mafischl	0:d9266031f832	407	* @params src the source MAC address to be copied into the ethernet header
mafischl	0:d9266031f832	408	* @params dst the destination MAC address to be copied into the ethernet header
mafischl	0:d9266031f832	409	* @return ERR_OK if the packet was sent, any other err_t on failure
mafischl	0:d9266031f832	410	*/
mafischl	0:d9266031f832	411	static err_t
mafischl	0:d9266031f832	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
mafischl	0:d9266031f832	413	{
mafischl	0:d9266031f832	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
mafischl	0:d9266031f832	415
mafischl	0:d9266031f832	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
mafischl	0:d9266031f832	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
mafischl	0:d9266031f832	418	ETHADDR32_COPY(&ethhdr->dest, dst);
mafischl	0:d9266031f832	419	ETHADDR16_COPY(&ethhdr->src, src);
mafischl	0:d9266031f832	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
mafischl	0:d9266031f832	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
mafischl	0:d9266031f832	422	/* send the packet */
mafischl	0:d9266031f832	423	return netif->linkoutput(netif, p);
mafischl	0:d9266031f832	424	}
mafischl	0:d9266031f832	425
mafischl	0:d9266031f832	426	/**
mafischl	0:d9266031f832	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
mafischl	0:d9266031f832	428	*
mafischl	0:d9266031f832	429	* If a pending entry is resolved, any queued packets will be sent
mafischl	0:d9266031f832	430	* at this point.
mafischl	0:d9266031f832	431	*
mafischl	0:d9266031f832	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
mafischl	0:d9266031f832	433	* @param ipaddr IP address of the inserted ARP entry.
mafischl	0:d9266031f832	434	* @param ethaddr Ethernet address of the inserted ARP entry.
mafischl	0:d9266031f832	435	* @param flags @see definition of ETHARP_FLAG_*
mafischl	0:d9266031f832	436	*
mafischl	0:d9266031f832	437	* @return
mafischl	0:d9266031f832	438	* - ERR_OK Succesfully updated ARP cache.
mafischl	0:d9266031f832	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
mafischl	0:d9266031f832	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
mafischl	0:d9266031f832	441	*
mafischl	0:d9266031f832	442	* @see pbuf_free()
mafischl	0:d9266031f832	443	*/
mafischl	0:d9266031f832	444	static err_t
mafischl	0:d9266031f832	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
mafischl	0:d9266031f832	446	{
mafischl	0:d9266031f832	447	s8_t i;
mafischl	0:d9266031f832	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
mafischl	0:d9266031f832	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",
mafischl	0:d9266031f832	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
mafischl	0:d9266031f832	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
mafischl	0:d9266031f832	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
mafischl	0:d9266031f832	453	/* non-unicast address? */
mafischl	0:d9266031f832	454	if (ip_addr_isany(ipaddr) \|\|
mafischl	0:d9266031f832	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
mafischl	0:d9266031f832	456	ip_addr_ismulticast(ipaddr)) {
mafischl	0:d9266031f832	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
mafischl	0:d9266031f832	458	return ERR_ARG;
mafischl	0:d9266031f832	459	}
mafischl	0:d9266031f832	460	/* find or create ARP entry */
mafischl	0:d9266031f832	461	i = find_entry(ipaddr, flags);
mafischl	0:d9266031f832	462	/* bail out if no entry could be found */
mafischl	0:d9266031f832	463	if (i < 0) {
mafischl	0:d9266031f832	464	return (err_t)i;
mafischl	0:d9266031f832	465	}
mafischl	0:d9266031f832	466
mafischl	0:d9266031f832	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
mafischl	0:d9266031f832	469	/* record static type */
mafischl	0:d9266031f832	470	arp_table[i].static_entry = 1;
mafischl	0:d9266031f832	471	}
mafischl	0:d9266031f832	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	473
mafischl	0:d9266031f832	474	/* mark it stable */
mafischl	0:d9266031f832	475	arp_table[i].state = ETHARP_STATE_STABLE;
mafischl	0:d9266031f832	476
mafischl	0:d9266031f832	477	#if LWIP_SNMP
mafischl	0:d9266031f832	478	/* record network interface */
mafischl	0:d9266031f832	479	arp_table[i].netif = netif;
mafischl	0:d9266031f832	480	#endif /* LWIP_SNMP */
mafischl	0:d9266031f832	481	/* insert in SNMP ARP index tree */
mafischl	0:d9266031f832	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
mafischl	0:d9266031f832	483
mafischl	0:d9266031f832	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
mafischl	0:d9266031f832	485	/* update address */
mafischl	0:d9266031f832	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
mafischl	0:d9266031f832	487	/* reset time stamp */
mafischl	0:d9266031f832	488	arp_table[i].ctime = 0;
mafischl	0:d9266031f832	489	#if ARP_QUEUEING
mafischl	0:d9266031f832	490	/* this is where we will send out queued packets! */
mafischl	0:d9266031f832	491	while (arp_table[i].q != NULL) {
mafischl	0:d9266031f832	492	struct pbuf *p;
mafischl	0:d9266031f832	493	/* remember remainder of queue */
mafischl	0:d9266031f832	494	struct etharp_q_entry *q = arp_table[i].q;
mafischl	0:d9266031f832	495	/* pop first item off the queue */
mafischl	0:d9266031f832	496	arp_table[i].q = q->next;
mafischl	0:d9266031f832	497	/* get the packet pointer */
mafischl	0:d9266031f832	498	p = q->p;
mafischl	0:d9266031f832	499	/* now queue entry can be freed */
mafischl	0:d9266031f832	500	memp_free(MEMP_ARP_QUEUE, q);
mafischl	0:d9266031f832	501	/* send the queued IP packet */
mafischl	0:d9266031f832	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
mafischl	0:d9266031f832	503	/* free the queued IP packet */
mafischl	0:d9266031f832	504	pbuf_free(p);
mafischl	0:d9266031f832	505	}
mafischl	0:d9266031f832	506	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	507	return ERR_OK;
mafischl	0:d9266031f832	508	}
mafischl	0:d9266031f832	509
mafischl	0:d9266031f832	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
mafischl	0:d9266031f832	511	/** Add a new static entry to the ARP table. If an entry exists for the
mafischl	0:d9266031f832	512	* specified IP address, this entry is overwritten.
mafischl	0:d9266031f832	513	* If packets are queued for the specified IP address, they are sent out.
mafischl	0:d9266031f832	514	*
mafischl	0:d9266031f832	515	* @param ipaddr IP address for the new static entry
mafischl	0:d9266031f832	516	* @param ethaddr ethernet address for the new static entry
mafischl	0:d9266031f832	517	* @return @see return values of etharp_add_static_entry
mafischl	0:d9266031f832	518	*/
mafischl	0:d9266031f832	519	err_t
mafischl	0:d9266031f832	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
mafischl	0:d9266031f832	521	{
mafischl	0:d9266031f832	522	struct netif *netif;
mafischl	0:d9266031f832	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",
mafischl	0:d9266031f832	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
mafischl	0:d9266031f832	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
mafischl	0:d9266031f832	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
mafischl	0:d9266031f832	527
mafischl	0:d9266031f832	528	netif = ip_route(ipaddr);
mafischl	0:d9266031f832	529	if (netif == NULL) {
mafischl	0:d9266031f832	530	return ERR_RTE;
mafischl	0:d9266031f832	531	}
mafischl	0:d9266031f832	532
mafischl	0:d9266031f832	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
mafischl	0:d9266031f832	534	}
mafischl	0:d9266031f832	535
mafischl	0:d9266031f832	536	/** Remove a static entry from the ARP table previously added with a call to
mafischl	0:d9266031f832	537	* etharp_add_static_entry.
mafischl	0:d9266031f832	538	*
mafischl	0:d9266031f832	539	* @param ipaddr IP address of the static entry to remove
mafischl	0:d9266031f832	540	* @return ERR_OK: entry removed
mafischl	0:d9266031f832	541	* ERR_MEM: entry wasn't found
mafischl	0:d9266031f832	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
mafischl	0:d9266031f832	543	*/
mafischl	0:d9266031f832	544	err_t
mafischl	0:d9266031f832	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
mafischl	0:d9266031f832	546	{
mafischl	0:d9266031f832	547	s8_t i;
mafischl	0:d9266031f832	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mafischl	0:d9266031f832	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
mafischl	0:d9266031f832	550
mafischl	0:d9266031f832	551	/* find or create ARP entry */
mafischl	0:d9266031f832	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
mafischl	0:d9266031f832	553	/* bail out if no entry could be found */
mafischl	0:d9266031f832	554	if (i < 0) {
mafischl	0:d9266031f832	555	return (err_t)i;
mafischl	0:d9266031f832	556	}
mafischl	0:d9266031f832	557
mafischl	0:d9266031f832	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
mafischl	0:d9266031f832	559	(arp_table[i].static_entry == 0)) {
mafischl	0:d9266031f832	560	/* entry wasn't a static entry, cannot remove it */
mafischl	0:d9266031f832	561	return ERR_ARG;
mafischl	0:d9266031f832	562	}
mafischl	0:d9266031f832	563	/* entry found, free it */
mafischl	0:d9266031f832	564	free_entry(i);
mafischl	0:d9266031f832	565	return ERR_OK;
mafischl	0:d9266031f832	566	}
mafischl	0:d9266031f832	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
mafischl	0:d9266031f832	568
mafischl	0:d9266031f832	569	/**
mafischl	0:d9266031f832	570	* Finds (stable) ethernet/IP address pair from ARP table
mafischl	0:d9266031f832	571	* using interface and IP address index.
mafischl	0:d9266031f832	572	* @note the addresses in the ARP table are in network order!
mafischl	0:d9266031f832	573	*
mafischl	0:d9266031f832	574	* @param netif points to interface index
mafischl	0:d9266031f832	575	* @param ipaddr points to the (network order) IP address index
mafischl	0:d9266031f832	576	* @param eth_ret points to return pointer
mafischl	0:d9266031f832	577	* @param ip_ret points to return pointer
mafischl	0:d9266031f832	578	* @return table index if found, -1 otherwise
mafischl	0:d9266031f832	579	*/
mafischl	0:d9266031f832	580	s8_t
mafischl	0:d9266031f832	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
mafischl	0:d9266031f832	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
mafischl	0:d9266031f832	583	{
mafischl	0:d9266031f832	584	s8_t i;
mafischl	0:d9266031f832	585
mafischl	0:d9266031f832	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
mafischl	0:d9266031f832	587	eth_ret != NULL && ip_ret != NULL);
mafischl	0:d9266031f832	588
mafischl	0:d9266031f832	589	LWIP_UNUSED_ARG(netif);
mafischl	0:d9266031f832	590
mafischl	0:d9266031f832	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
mafischl	0:d9266031f832	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
mafischl	0:d9266031f832	593	*eth_ret = &arp_table[i].ethaddr;
mafischl	0:d9266031f832	594	*ip_ret = &arp_table[i].ipaddr;
mafischl	0:d9266031f832	595	return i;
mafischl	0:d9266031f832	596	}
mafischl	0:d9266031f832	597	return -1;
mafischl	0:d9266031f832	598	}
mafischl	0:d9266031f832	599
mafischl	0:d9266031f832	600	#if ETHARP_TRUST_IP_MAC
mafischl	0:d9266031f832	601	/**
mafischl	0:d9266031f832	602	* Updates the ARP table using the given IP packet.
mafischl	0:d9266031f832	603	*
mafischl	0:d9266031f832	604	* Uses the incoming IP packet's source address to update the
mafischl	0:d9266031f832	605	* ARP cache for the local network. The function does not alter
mafischl	0:d9266031f832	606	* or free the packet. This function must be called before the
mafischl	0:d9266031f832	607	* packet p is passed to the IP layer.
mafischl	0:d9266031f832	608	*
mafischl	0:d9266031f832	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
mafischl	0:d9266031f832	610	* @param p The IP packet that arrived on netif.
mafischl	0:d9266031f832	611	*
mafischl	0:d9266031f832	612	* @return NULL
mafischl	0:d9266031f832	613	*
mafischl	0:d9266031f832	614	* @see pbuf_free()
mafischl	0:d9266031f832	615	*/
mafischl	0:d9266031f832	616	static void
mafischl	0:d9266031f832	617	etharp_ip_input(struct netif netif, struct pbuf p)
mafischl	0:d9266031f832	618	{
mafischl	0:d9266031f832	619	struct eth_hdr *ethhdr;
mafischl	0:d9266031f832	620	struct ip_hdr *iphdr;
mafischl	0:d9266031f832	621	ip_addr_t iphdr_src;
mafischl	0:d9266031f832	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
mafischl	0:d9266031f832	623
mafischl	0:d9266031f832	624	/* Only insert an entry if the source IP address of the
mafischl	0:d9266031f832	625	incoming IP packet comes from a host on the local network. */
mafischl	0:d9266031f832	626	ethhdr = (struct eth_hdr *)p->payload;
mafischl	0:d9266031f832	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
mafischl	0:d9266031f832	628	#if ETHARP_SUPPORT_VLAN
mafischl	0:d9266031f832	629	if (ethhdr->type == ETHTYPE_VLAN) {
mafischl	0:d9266031f832	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
mafischl	0:d9266031f832	631	}
mafischl	0:d9266031f832	632	#endif /* ETHARP_SUPPORT_VLAN */
mafischl	0:d9266031f832	633
mafischl	0:d9266031f832	634	ip_addr_copy(iphdr_src, iphdr->src);
mafischl	0:d9266031f832	635
mafischl	0:d9266031f832	636	/* source is not on the local network? */
mafischl	0:d9266031f832	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
mafischl	0:d9266031f832	638	/* do nothing */
mafischl	0:d9266031f832	639	return;
mafischl	0:d9266031f832	640	}
mafischl	0:d9266031f832	641
mafischl	0:d9266031f832	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
mafischl	0:d9266031f832	643	/* update the source IP address in the cache, if present */
mafischl	0:d9266031f832	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
mafischl	0:d9266031f832	645	* back soon (for example, if the destination IP address is ours. */
mafischl	0:d9266031f832	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
mafischl	0:d9266031f832	647	}
mafischl	0:d9266031f832	648	#endif /* ETHARP_TRUST_IP_MAC */
mafischl	0:d9266031f832	649
mafischl	0:d9266031f832	650	/**
mafischl	0:d9266031f832	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
mafischl	0:d9266031f832	652	* send out queued IP packets. Updates cache with snooped address pairs.
mafischl	0:d9266031f832	653	*
mafischl	0:d9266031f832	654	* Should be called for incoming ARP packets. The pbuf in the argument
mafischl	0:d9266031f832	655	* is freed by this function.
mafischl	0:d9266031f832	656	*
mafischl	0:d9266031f832	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
mafischl	0:d9266031f832	658	* @param ethaddr Ethernet address of netif.
mafischl	0:d9266031f832	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
mafischl	0:d9266031f832	660	*
mafischl	0:d9266031f832	661	* @return NULL
mafischl	0:d9266031f832	662	*
mafischl	0:d9266031f832	663	* @see pbuf_free()
mafischl	0:d9266031f832	664	*/
mafischl	0:d9266031f832	665	static void
mafischl	0:d9266031f832	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
mafischl	0:d9266031f832	667	{
mafischl	0:d9266031f832	668	struct etharp_hdr *hdr;
mafischl	0:d9266031f832	669	struct eth_hdr *ethhdr;
mafischl	0:d9266031f832	670	/* these are aligned properly, whereas the ARP header fields might not be */
mafischl	0:d9266031f832	671	ip_addr_t sipaddr, dipaddr;
mafischl	0:d9266031f832	672	u8_t for_us;
mafischl	0:d9266031f832	673	#if LWIP_AUTOIP
mafischl	0:d9266031f832	674	const u8_t * ethdst_hwaddr;
mafischl	0:d9266031f832	675	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	676
mafischl	0:d9266031f832	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
mafischl	0:d9266031f832	678
mafischl	0:d9266031f832	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
mafischl	0:d9266031f832	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
mafischl	0:d9266031f832	681	if (p->len < SIZEOF_ETHARP_PACKET) {
mafischl	0:d9266031f832	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
mafischl	0:d9266031f832	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
mafischl	0:d9266031f832	684	(s16_t)SIZEOF_ETHARP_PACKET));
mafischl	0:d9266031f832	685	ETHARP_STATS_INC(etharp.lenerr);
mafischl	0:d9266031f832	686	ETHARP_STATS_INC(etharp.drop);
mafischl	0:d9266031f832	687	pbuf_free(p);
mafischl	0:d9266031f832	688	return;
mafischl	0:d9266031f832	689	}
mafischl	0:d9266031f832	690
mafischl	0:d9266031f832	691	ethhdr = (struct eth_hdr *)p->payload;
mafischl	0:d9266031f832	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
mafischl	0:d9266031f832	693	#if ETHARP_SUPPORT_VLAN
mafischl	0:d9266031f832	694	if (ethhdr->type == ETHTYPE_VLAN) {
mafischl	0:d9266031f832	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
mafischl	0:d9266031f832	696	}
mafischl	0:d9266031f832	697	#endif /* ETHARP_SUPPORT_VLAN */
mafischl	0:d9266031f832	698
mafischl	0:d9266031f832	699	/* RFC 826 "Packet Reception": */
mafischl	0:d9266031f832	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
mafischl	0:d9266031f832	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
mafischl	0:d9266031f832	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
mafischl	0:d9266031f832	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
mafischl	0:d9266031f832	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
mafischl	0:d9266031f832	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
mafischl	0:d9266031f832	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",
mafischl	0:d9266031f832	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
mafischl	0:d9266031f832	708	ETHARP_STATS_INC(etharp.proterr);
mafischl	0:d9266031f832	709	ETHARP_STATS_INC(etharp.drop);
mafischl	0:d9266031f832	710	pbuf_free(p);
mafischl	0:d9266031f832	711	return;
mafischl	0:d9266031f832	712	}
mafischl	0:d9266031f832	713	ETHARP_STATS_INC(etharp.recv);
mafischl	0:d9266031f832	714
mafischl	0:d9266031f832	715	#if LWIP_AUTOIP
mafischl	0:d9266031f832	716	/* We have to check if a host already has configured our random
mafischl	0:d9266031f832	717	* created link local address and continously check if there is
mafischl	0:d9266031f832	718	* a host with this IP-address so we can detect collisions */
mafischl	0:d9266031f832	719	autoip_arp_reply(netif, hdr);
mafischl	0:d9266031f832	720	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	721
mafischl	0:d9266031f832	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
mafischl	0:d9266031f832	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
mafischl	0:d9266031f832	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
mafischl	0:d9266031f832	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
mafischl	0:d9266031f832	726
mafischl	0:d9266031f832	727	/* this interface is not configured? */
mafischl	0:d9266031f832	728	if (ip_addr_isany(&netif->ip_addr)) {
mafischl	0:d9266031f832	729	for_us = 0;
mafischl	0:d9266031f832	730	} else {
mafischl	0:d9266031f832	731	/* ARP packet directed to us? */
mafischl	0:d9266031f832	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
mafischl	0:d9266031f832	733	}
mafischl	0:d9266031f832	734
mafischl	0:d9266031f832	735	/* ARP message directed to us?
mafischl	0:d9266031f832	736	-> add IP address in ARP cache; assume requester wants to talk to us,
mafischl	0:d9266031f832	737	can result in directly sending the queued packets for this host.
mafischl	0:d9266031f832	738	ARP message not directed to us?
mafischl	0:d9266031f832	739	-> update the source IP address in the cache, if present */
mafischl	0:d9266031f832	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
mafischl	0:d9266031f832	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
mafischl	0:d9266031f832	742
mafischl	0:d9266031f832	743	/* now act on the message itself */
mafischl	0:d9266031f832	744	switch (hdr->opcode) {
mafischl	0:d9266031f832	745	/* ARP request? */
mafischl	0:d9266031f832	746	case PP_HTONS(ARP_REQUEST):
mafischl	0:d9266031f832	747	/* ARP request. If it asked for our address, we send out a
mafischl	0:d9266031f832	748	* reply. In any case, we time-stamp any existing ARP entry,
mafischl	0:d9266031f832	749	* and possiby send out an IP packet that was queued on it. */
mafischl	0:d9266031f832	750
mafischl	0:d9266031f832	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
mafischl	0:d9266031f832	752	/* ARP request for our address? */
mafischl	0:d9266031f832	753	if (for_us) {
mafischl	0:d9266031f832	754
mafischl	0:d9266031f832	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
mafischl	0:d9266031f832	756	/* Re-use pbuf to send ARP reply.
mafischl	0:d9266031f832	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
mafischl	0:d9266031f832	758	that would allocate a new pbuf. */
mafischl	0:d9266031f832	759	hdr->opcode = htons(ARP_REPLY);
mafischl	0:d9266031f832	760
mafischl	0:d9266031f832	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
mafischl	0:d9266031f832	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
mafischl	0:d9266031f832	763
mafischl	0:d9266031f832	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
mafischl	0:d9266031f832	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
mafischl	0:d9266031f832	766	#if LWIP_AUTOIP
mafischl	0:d9266031f832	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
mafischl	0:d9266031f832	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
mafischl	0:d9266031f832	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
mafischl	0:d9266031f832	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
mafischl	0:d9266031f832	771	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	772
mafischl	0:d9266031f832	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
mafischl	0:d9266031f832	774	#if LWIP_AUTOIP
mafischl	0:d9266031f832	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
mafischl	0:d9266031f832	776	#else /* LWIP_AUTOIP */
mafischl	0:d9266031f832	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
mafischl	0:d9266031f832	778	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
mafischl	0:d9266031f832	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
mafischl	0:d9266031f832	781
mafischl	0:d9266031f832	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
mafischl	0:d9266031f832	783	are already correct, we tested that before */
mafischl	0:d9266031f832	784
mafischl	0:d9266031f832	785	/* return ARP reply */
mafischl	0:d9266031f832	786	netif->linkoutput(netif, p);
mafischl	0:d9266031f832	787	/* we are not configured? */
mafischl	0:d9266031f832	788	} else if (ip_addr_isany(&netif->ip_addr)) {
mafischl	0:d9266031f832	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
mafischl	0:d9266031f832	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
mafischl	0:d9266031f832	791	/* request was not directed to us */
mafischl	0:d9266031f832	792	} else {
mafischl	0:d9266031f832	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
mafischl	0:d9266031f832	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
mafischl	0:d9266031f832	795	}
mafischl	0:d9266031f832	796	break;
mafischl	0:d9266031f832	797	case PP_HTONS(ARP_REPLY):
mafischl	0:d9266031f832	798	/* ARP reply. We already updated the ARP cache earlier. */
mafischl	0:d9266031f832	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
mafischl	0:d9266031f832	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
mafischl	0:d9266031f832	801	/* DHCP wants to know about ARP replies from any host with an
mafischl	0:d9266031f832	802	* IP address also offered to us by the DHCP server. We do not
mafischl	0:d9266031f832	803	* want to take a duplicate IP address on a single network.
mafischl	0:d9266031f832	804	* @todo How should we handle redundant (fail-over) interfaces? */
mafischl	0:d9266031f832	805	dhcp_arp_reply(netif, &sipaddr);
mafischl	0:d9266031f832	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
mafischl	0:d9266031f832	807	break;
mafischl	0:d9266031f832	808	default:
mafischl	0:d9266031f832	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
mafischl	0:d9266031f832	810	ETHARP_STATS_INC(etharp.err);
mafischl	0:d9266031f832	811	break;
mafischl	0:d9266031f832	812	}
mafischl	0:d9266031f832	813	/* free ARP packet */
mafischl	0:d9266031f832	814	pbuf_free(p);
mafischl	0:d9266031f832	815	}
mafischl	0:d9266031f832	816
mafischl	0:d9266031f832	817	/**
mafischl	0:d9266031f832	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
mafischl	0:d9266031f832	819	*
mafischl	0:d9266031f832	820	* For IP multicast and broadcast, corresponding Ethernet addresses
mafischl	0:d9266031f832	821	* are selected and the packet is transmitted on the link.
mafischl	0:d9266031f832	822	*
mafischl	0:d9266031f832	823	* For unicast addresses, the packet is submitted to etharp_query(). In
mafischl	0:d9266031f832	824	* case the IP address is outside the local network, the IP address of
mafischl	0:d9266031f832	825	* the gateway is used.
mafischl	0:d9266031f832	826	*
mafischl	0:d9266031f832	827	* @param netif The lwIP network interface which the IP packet will be sent on.
mafischl	0:d9266031f832	828	* @param q The pbuf(s) containing the IP packet to be sent.
mafischl	0:d9266031f832	829	* @param ipaddr The IP address of the packet destination.
mafischl	0:d9266031f832	830	*
mafischl	0:d9266031f832	831	* @return
mafischl	0:d9266031f832	832	* - ERR_RTE No route to destination (no gateway to external networks),
mafischl	0:d9266031f832	833	* or the return type of either etharp_query() or etharp_send_ip().
mafischl	0:d9266031f832	834	*/
mafischl	0:d9266031f832	835	err_t
mafischl	0:d9266031f832	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
mafischl	0:d9266031f832	837	{
mafischl	0:d9266031f832	838	struct eth_addr *dest, mcastaddr;
mafischl	0:d9266031f832	839
mafischl	0:d9266031f832	840	/* make room for Ethernet header - should not fail */
mafischl	0:d9266031f832	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
mafischl	0:d9266031f832	842	/* bail out */
mafischl	0:d9266031f832	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mafischl	0:d9266031f832	844	("etharp_output: could not allocate room for header.\n"));
mafischl	0:d9266031f832	845	LINK_STATS_INC(link.lenerr);
mafischl	0:d9266031f832	846	return ERR_BUF;
mafischl	0:d9266031f832	847	}
mafischl	0:d9266031f832	848
mafischl	0:d9266031f832	849	/* assume unresolved Ethernet address */
mafischl	0:d9266031f832	850	dest = NULL;
mafischl	0:d9266031f832	851	/* Determine on destination hardware address. Broadcasts and multicasts
mafischl	0:d9266031f832	852	* are special, other IP addresses are looked up in the ARP table. */
mafischl	0:d9266031f832	853
mafischl	0:d9266031f832	854	/* broadcast destination IP address? */
mafischl	0:d9266031f832	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
mafischl	0:d9266031f832	856	/* broadcast on Ethernet also */
mafischl	0:d9266031f832	857	dest = (struct eth_addr *)&ethbroadcast;
mafischl	0:d9266031f832	858	/* multicast destination IP address? */
mafischl	0:d9266031f832	859	} else if (ip_addr_ismulticast(ipaddr)) {
mafischl	0:d9266031f832	860	/* Hash IP multicast address to MAC address.*/
mafischl	0:d9266031f832	861	mcastaddr.addr[0] = 0x01;
mafischl	0:d9266031f832	862	mcastaddr.addr[1] = 0x00;
mafischl	0:d9266031f832	863	mcastaddr.addr[2] = 0x5e;
mafischl	0:d9266031f832	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
mafischl	0:d9266031f832	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
mafischl	0:d9266031f832	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
mafischl	0:d9266031f832	867	/* destination Ethernet address is multicast */
mafischl	0:d9266031f832	868	dest = &mcastaddr;
mafischl	0:d9266031f832	869	/* unicast destination IP address? */
mafischl	0:d9266031f832	870	} else {
mafischl	0:d9266031f832	871	/* outside local network? */
mafischl	0:d9266031f832	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
mafischl	0:d9266031f832	873	!ip_addr_islinklocal(ipaddr)) {
mafischl	0:d9266031f832	874	/* interface has default gateway? */
mafischl	0:d9266031f832	875	if (!ip_addr_isany(&netif->gw)) {
mafischl	0:d9266031f832	876	/* send to hardware address of default gateway IP address */
mafischl	0:d9266031f832	877	ipaddr = &(netif->gw);
mafischl	0:d9266031f832	878	/* no default gateway available */
mafischl	0:d9266031f832	879	} else {
mafischl	0:d9266031f832	880	/* no route to destination error (default gateway missing) */
mafischl	0:d9266031f832	881	return ERR_RTE;
mafischl	0:d9266031f832	882	}
mafischl	0:d9266031f832	883	}
mafischl	0:d9266031f832	884	#if LWIP_NETIF_HWADDRHINT
mafischl	0:d9266031f832	885	if (netif->addr_hint != NULL) {
mafischl	0:d9266031f832	886	/* per-pcb cached entry was given */
mafischl	0:d9266031f832	887	u8_t etharp_cached_entry = *(netif->addr_hint);
mafischl	0:d9266031f832	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
mafischl	0:d9266031f832	889	#endif /* LWIP_NETIF_HWADDRHINT */
mafischl	0:d9266031f832	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
mafischl	0:d9266031f832	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
mafischl	0:d9266031f832	892	/* the per-pcb-cached entry is stable and the right one! */
mafischl	0:d9266031f832	893	ETHARP_STATS_INC(etharp.cachehit);
mafischl	0:d9266031f832	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
mafischl	0:d9266031f832	895	&arp_table[etharp_cached_entry].ethaddr);
mafischl	0:d9266031f832	896	}
mafischl	0:d9266031f832	897	#if LWIP_NETIF_HWADDRHINT
mafischl	0:d9266031f832	898	}
mafischl	0:d9266031f832	899	}
mafischl	0:d9266031f832	900	#endif /* LWIP_NETIF_HWADDRHINT */
mafischl	0:d9266031f832	901	/* queue on destination Ethernet address belonging to ipaddr */
mafischl	0:d9266031f832	902	return etharp_query(netif, ipaddr, q);
mafischl	0:d9266031f832	903	}
mafischl	0:d9266031f832	904
mafischl	0:d9266031f832	905	/* continuation for multicast/broadcast destinations */
mafischl	0:d9266031f832	906	/* obtain source Ethernet address of the given interface */
mafischl	0:d9266031f832	907	/* send packet directly on the link */
mafischl	0:d9266031f832	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
mafischl	0:d9266031f832	909	}
mafischl	0:d9266031f832	910
mafischl	0:d9266031f832	911	/**
mafischl	0:d9266031f832	912	* Send an ARP request for the given IP address and/or queue a packet.
mafischl	0:d9266031f832	913	*
mafischl	0:d9266031f832	914	* If the IP address was not yet in the cache, a pending ARP cache entry
mafischl	0:d9266031f832	915	* is added and an ARP request is sent for the given address. The packet
mafischl	0:d9266031f832	916	* is queued on this entry.
mafischl	0:d9266031f832	917	*
mafischl	0:d9266031f832	918	* If the IP address was already pending in the cache, a new ARP request
mafischl	0:d9266031f832	919	* is sent for the given address. The packet is queued on this entry.
mafischl	0:d9266031f832	920	*
mafischl	0:d9266031f832	921	* If the IP address was already stable in the cache, and a packet is
mafischl	0:d9266031f832	922	* given, it is directly sent and no ARP request is sent out.
mafischl	0:d9266031f832	923	*
mafischl	0:d9266031f832	924	* If the IP address was already stable in the cache, and no packet is
mafischl	0:d9266031f832	925	* given, an ARP request is sent out.
mafischl	0:d9266031f832	926	*
mafischl	0:d9266031f832	927	* @param netif The lwIP network interface on which ipaddr
mafischl	0:d9266031f832	928	* must be queried for.
mafischl	0:d9266031f832	929	* @param ipaddr The IP address to be resolved.
mafischl	0:d9266031f832	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
mafischl	0:d9266031f832	931	* q is not freed by this function.
mafischl	0:d9266031f832	932	*
mafischl	0:d9266031f832	933	* @note q must only be ONE packet, not a packet queue!
mafischl	0:d9266031f832	934	*
mafischl	0:d9266031f832	935	* @return
mafischl	0:d9266031f832	936	* - ERR_BUF Could not make room for Ethernet header.
mafischl	0:d9266031f832	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
mafischl	0:d9266031f832	938	* to query for address or queue the packet.
mafischl	0:d9266031f832	939	* - ERR_MEM Could not queue packet due to memory shortage.
mafischl	0:d9266031f832	940	* - ERR_RTE No route to destination (no gateway to external networks).
mafischl	0:d9266031f832	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
mafischl	0:d9266031f832	942	*
mafischl	0:d9266031f832	943	*/
mafischl	0:d9266031f832	944	err_t
mafischl	0:d9266031f832	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
mafischl	0:d9266031f832	946	{
mafischl	0:d9266031f832	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
mafischl	0:d9266031f832	948	err_t result = ERR_MEM;
mafischl	0:d9266031f832	949	s8_t i; /* ARP entry index */
mafischl	0:d9266031f832	950
mafischl	0:d9266031f832	951	/* non-unicast address? */
mafischl	0:d9266031f832	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
mafischl	0:d9266031f832	953	ip_addr_ismulticast(ipaddr) \|\|
mafischl	0:d9266031f832	954	ip_addr_isany(ipaddr)) {
mafischl	0:d9266031f832	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
mafischl	0:d9266031f832	956	return ERR_ARG;
mafischl	0:d9266031f832	957	}
mafischl	0:d9266031f832	958
mafischl	0:d9266031f832	959	/* find entry in ARP cache, ask to create entry if queueing packet */
mafischl	0:d9266031f832	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
mafischl	0:d9266031f832	961
mafischl	0:d9266031f832	962	/* could not find or create entry? */
mafischl	0:d9266031f832	963	if (i < 0) {
mafischl	0:d9266031f832	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
mafischl	0:d9266031f832	965	if (q) {
mafischl	0:d9266031f832	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
mafischl	0:d9266031f832	967	ETHARP_STATS_INC(etharp.memerr);
mafischl	0:d9266031f832	968	}
mafischl	0:d9266031f832	969	return (err_t)i;
mafischl	0:d9266031f832	970	}
mafischl	0:d9266031f832	971
mafischl	0:d9266031f832	972	/* mark a fresh entry as pending (we just sent a request) */
mafischl	0:d9266031f832	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
mafischl	0:d9266031f832	974	arp_table[i].state = ETHARP_STATE_PENDING;
mafischl	0:d9266031f832	975	}
mafischl	0:d9266031f832	976
mafischl	0:d9266031f832	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
mafischl	0:d9266031f832	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
mafischl	0:d9266031f832	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
mafischl	0:d9266031f832	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
mafischl	0:d9266031f832	981
mafischl	0:d9266031f832	982	/* do we have a pending entry? or an implicit query request? */
mafischl	0:d9266031f832	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
mafischl	0:d9266031f832	984	/* try to resolve it; send out ARP request */
mafischl	0:d9266031f832	985	result = etharp_request(netif, ipaddr);
mafischl	0:d9266031f832	986	if (result != ERR_OK) {
mafischl	0:d9266031f832	987	/* ARP request couldn't be sent */
mafischl	0:d9266031f832	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
mafischl	0:d9266031f832	989	since this failure could be temporary, and the next packet calling
mafischl	0:d9266031f832	990	etharp_query again could lead to sending the queued packets. */
mafischl	0:d9266031f832	991	}
mafischl	0:d9266031f832	992	if (q == NULL) {
mafischl	0:d9266031f832	993	return result;
mafischl	0:d9266031f832	994	}
mafischl	0:d9266031f832	995	}
mafischl	0:d9266031f832	996
mafischl	0:d9266031f832	997	/* packet given? */
mafischl	0:d9266031f832	998	LWIP_ASSERT("q != NULL", q != NULL);
mafischl	0:d9266031f832	999	/* stable entry? */
mafischl	0:d9266031f832	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
mafischl	0:d9266031f832	1001	/* we have a valid IP->Ethernet address mapping */
mafischl	0:d9266031f832	1002	ETHARP_SET_HINT(netif, i);
mafischl	0:d9266031f832	1003	/* send the packet */
mafischl	0:d9266031f832	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
mafischl	0:d9266031f832	1005	/* pending entry? (either just created or already pending */
mafischl	0:d9266031f832	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
mafischl	0:d9266031f832	1007	#if ARP_QUEUEING /* queue the given q packet */
mafischl	0:d9266031f832	1008	struct pbuf *p;
mafischl	0:d9266031f832	1009	int copy_needed = 0;
mafischl	0:d9266031f832	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
mafischl	0:d9266031f832	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
mafischl	0:d9266031f832	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
mafischl	0:d9266031f832	1013	p = q;
mafischl	0:d9266031f832	1014	while (p) {
mafischl	0:d9266031f832	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
mafischl	0:d9266031f832	1016	if(p->type != PBUF_ROM) {
mafischl	0:d9266031f832	1017	copy_needed = 1;
mafischl	0:d9266031f832	1018	break;
mafischl	0:d9266031f832	1019	}
mafischl	0:d9266031f832	1020	p = p->next;
mafischl	0:d9266031f832	1021	}
mafischl	0:d9266031f832	1022	if(copy_needed) {
mafischl	0:d9266031f832	1023	/* copy the whole packet into new pbufs */
mafischl	0:d9266031f832	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
mafischl	0:d9266031f832	1025	if(p != NULL) {
mafischl	0:d9266031f832	1026	if (pbuf_copy(p, q) != ERR_OK) {
mafischl	0:d9266031f832	1027	pbuf_free(p);
mafischl	0:d9266031f832	1028	p = NULL;
mafischl	0:d9266031f832	1029	}
mafischl	0:d9266031f832	1030	}
mafischl	0:d9266031f832	1031	} else {
mafischl	0:d9266031f832	1032	/* referencing the old pbuf is enough */
mafischl	0:d9266031f832	1033	p = q;
mafischl	0:d9266031f832	1034	pbuf_ref(p);
mafischl	0:d9266031f832	1035	}
mafischl	0:d9266031f832	1036	/* packet could be taken over? */
mafischl	0:d9266031f832	1037	if (p != NULL) {
mafischl	0:d9266031f832	1038	/* queue packet ... */
mafischl	0:d9266031f832	1039	struct etharp_q_entry *new_entry;
mafischl	0:d9266031f832	1040	/* allocate a new arp queue entry */
mafischl	0:d9266031f832	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
mafischl	0:d9266031f832	1042	if (new_entry != NULL) {
mafischl	0:d9266031f832	1043	new_entry->next = 0;
mafischl	0:d9266031f832	1044	new_entry->p = p;
mafischl	0:d9266031f832	1045	if(arp_table[i].q != NULL) {
mafischl	0:d9266031f832	1046	/* queue was already existent, append the new entry to the end */
mafischl	0:d9266031f832	1047	struct etharp_q_entry *r;
mafischl	0:d9266031f832	1048	r = arp_table[i].q;
mafischl	0:d9266031f832	1049	while (r->next != NULL) {
mafischl	0:d9266031f832	1050	r = r->next;
mafischl	0:d9266031f832	1051	}
mafischl	0:d9266031f832	1052	r->next = new_entry;
mafischl	0:d9266031f832	1053	} else {
mafischl	0:d9266031f832	1054	/* queue did not exist, first item in queue */
mafischl	0:d9266031f832	1055	arp_table[i].q = new_entry;
mafischl	0:d9266031f832	1056	}
mafischl	0:d9266031f832	1057	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
mafischl	0:d9266031f832	1058	result = ERR_OK;
mafischl	0:d9266031f832	1059	} else {
mafischl	0:d9266031f832	1060	/* the pool MEMP_ARP_QUEUE is empty */
mafischl	0:d9266031f832	1061	pbuf_free(p);
mafischl	0:d9266031f832	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));
mafischl	0:d9266031f832	1063	/* { result == ERR_MEM } through initialization */
mafischl	0:d9266031f832	1064	}
mafischl	0:d9266031f832	1065	} else {
mafischl	0:d9266031f832	1066	ETHARP_STATS_INC(etharp.memerr);
mafischl	0:d9266031f832	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));
mafischl	0:d9266031f832	1068	/* { result == ERR_MEM } through initialization */
mafischl	0:d9266031f832	1069	}
mafischl	0:d9266031f832	1070	#else /* ARP_QUEUEING */
mafischl	0:d9266031f832	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
mafischl	0:d9266031f832	1072	/* { result == ERR_MEM } through initialization */
mafischl	0:d9266031f832	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
mafischl	0:d9266031f832	1074	#endif /* ARP_QUEUEING */
mafischl	0:d9266031f832	1075	}
mafischl	0:d9266031f832	1076	return result;
mafischl	0:d9266031f832	1077	}
mafischl	0:d9266031f832	1078
mafischl	0:d9266031f832	1079	/**
mafischl	0:d9266031f832	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
mafischl	0:d9266031f832	1081	*
mafischl	0:d9266031f832	1082	* @param netif the lwip network interface on which to send the ARP packet
mafischl	0:d9266031f832	1083	* @param ethsrc_addr the source MAC address for the ethernet header
mafischl	0:d9266031f832	1084	* @param ethdst_addr the destination MAC address for the ethernet header
mafischl	0:d9266031f832	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
mafischl	0:d9266031f832	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
mafischl	0:d9266031f832	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
mafischl	0:d9266031f832	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
mafischl	0:d9266031f832	1089	* @param opcode the type of the ARP packet
mafischl	0:d9266031f832	1090	* @return ERR_OK if the ARP packet has been sent
mafischl	0:d9266031f832	1091	* ERR_MEM if the ARP packet couldn't be allocated
mafischl	0:d9266031f832	1092	* any other err_t on failure
mafischl	0:d9266031f832	1093	*/
mafischl	0:d9266031f832	1094	#if !LWIP_AUTOIP
mafischl	0:d9266031f832	1095	static
mafischl	0:d9266031f832	1096	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	1097	err_t
mafischl	0:d9266031f832	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
mafischl	0:d9266031f832	1099	const struct eth_addr *ethdst_addr,
mafischl	0:d9266031f832	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
mafischl	0:d9266031f832	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
mafischl	0:d9266031f832	1102	const u16_t opcode)
mafischl	0:d9266031f832	1103	{
mafischl	0:d9266031f832	1104	struct pbuf *p;
mafischl	0:d9266031f832	1105	err_t result = ERR_OK;
mafischl	0:d9266031f832	1106	struct eth_hdr *ethhdr;
mafischl	0:d9266031f832	1107	struct etharp_hdr *hdr;
mafischl	0:d9266031f832	1108	#if LWIP_AUTOIP
mafischl	0:d9266031f832	1109	const u8_t * ethdst_hwaddr;
mafischl	0:d9266031f832	1110	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	1111
mafischl	0:d9266031f832	1112	/* allocate a pbuf for the outgoing ARP request packet */
mafischl	0:d9266031f832	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
mafischl	0:d9266031f832	1114	/* could allocate a pbuf for an ARP request? */
mafischl	0:d9266031f832	1115	if (p == NULL) {
mafischl	0:d9266031f832	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
mafischl	0:d9266031f832	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
mafischl	0:d9266031f832	1118	ETHARP_STATS_INC(etharp.memerr);
mafischl	0:d9266031f832	1119	return ERR_MEM;
mafischl	0:d9266031f832	1120	}
mafischl	0:d9266031f832	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
mafischl	0:d9266031f832	1122	(p->len >= SIZEOF_ETHARP_PACKET));
mafischl	0:d9266031f832	1123
mafischl	0:d9266031f832	1124	ethhdr = (struct eth_hdr *)p->payload;
mafischl	0:d9266031f832	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
mafischl	0:d9266031f832	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
mafischl	0:d9266031f832	1127	hdr->opcode = htons(opcode);
mafischl	0:d9266031f832	1128
mafischl	0:d9266031f832	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
mafischl	0:d9266031f832	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
mafischl	0:d9266031f832	1131	#if LWIP_AUTOIP
mafischl	0:d9266031f832	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
mafischl	0:d9266031f832	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
mafischl	0:d9266031f832	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
mafischl	0:d9266031f832	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
mafischl	0:d9266031f832	1136	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	1137	/* Write the ARP MAC-Addresses */
mafischl	0:d9266031f832	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
mafischl	0:d9266031f832	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
mafischl	0:d9266031f832	1140	/* Write the Ethernet MAC-Addresses */
mafischl	0:d9266031f832	1141	#if LWIP_AUTOIP
mafischl	0:d9266031f832	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
mafischl	0:d9266031f832	1143	#else /* LWIP_AUTOIP */
mafischl	0:d9266031f832	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
mafischl	0:d9266031f832	1145	#endif /* LWIP_AUTOIP */
mafischl	0:d9266031f832	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
mafischl	0:d9266031f832	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
mafischl	0:d9266031f832	1148	* structure packing. */
mafischl	0:d9266031f832	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
mafischl	0:d9266031f832	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
mafischl	0:d9266031f832	1151
mafischl	0:d9266031f832	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
mafischl	0:d9266031f832	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
mafischl	0:d9266031f832	1154	/* set hwlen and protolen */
mafischl	0:d9266031f832	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
mafischl	0:d9266031f832	1156	hdr->protolen = sizeof(ip_addr_t);
mafischl	0:d9266031f832	1157
mafischl	0:d9266031f832	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
mafischl	0:d9266031f832	1159	/* send ARP query */
mafischl	0:d9266031f832	1160	result = netif->linkoutput(netif, p);
mafischl	0:d9266031f832	1161	ETHARP_STATS_INC(etharp.xmit);
mafischl	0:d9266031f832	1162	/* free ARP query packet */
mafischl	0:d9266031f832	1163	pbuf_free(p);
mafischl	0:d9266031f832	1164	p = NULL;
mafischl	0:d9266031f832	1165	/* could not allocate pbuf for ARP request */
mafischl	0:d9266031f832	1166
mafischl	0:d9266031f832	1167	return result;
mafischl	0:d9266031f832	1168	}
mafischl	0:d9266031f832	1169
mafischl	0:d9266031f832	1170	/**
mafischl	0:d9266031f832	1171	* Send an ARP request packet asking for ipaddr.
mafischl	0:d9266031f832	1172	*
mafischl	0:d9266031f832	1173	* @param netif the lwip network interface on which to send the request
mafischl	0:d9266031f832	1174	* @param ipaddr the IP address for which to ask
mafischl	0:d9266031f832	1175	* @return ERR_OK if the request has been sent
mafischl	0:d9266031f832	1176	* ERR_MEM if the ARP packet couldn't be allocated
mafischl	0:d9266031f832	1177	* any other err_t on failure
mafischl	0:d9266031f832	1178	*/
mafischl	0:d9266031f832	1179	err_t
mafischl	0:d9266031f832	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
mafischl	0:d9266031f832	1181	{
mafischl	0:d9266031f832	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
mafischl	0:d9266031f832	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
mafischl	0:d9266031f832	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
mafischl	0:d9266031f832	1185	ipaddr, ARP_REQUEST);
mafischl	0:d9266031f832	1186	}
mafischl	0:d9266031f832	1187	#endif /* LWIP_ARP */
mafischl	0:d9266031f832	1188
mafischl	0:d9266031f832	1189	/**
mafischl	0:d9266031f832	1190	* Process received ethernet frames. Using this function instead of directly
mafischl	0:d9266031f832	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
mafischl	0:d9266031f832	1192	* the ARP cache is protected from concurrent access.
mafischl	0:d9266031f832	1193	*
mafischl	0:d9266031f832	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
mafischl	0:d9266031f832	1195	* @param netif the network interface on which the packet was received
mafischl	0:d9266031f832	1196	*/
mafischl	0:d9266031f832	1197	err_t
mafischl	0:d9266031f832	1198	ethernet_input(struct pbuf p, struct netif netif)
mafischl	0:d9266031f832	1199	{
mafischl	0:d9266031f832	1200	struct eth_hdr* ethhdr;
mafischl	0:d9266031f832	1201	u16_t type;
mafischl	0:d9266031f832	1202
mafischl	0:d9266031f832	1203	/* points to packet payload, which starts with an Ethernet header */
mafischl	0:d9266031f832	1204	ethhdr = (struct eth_hdr *)p->payload;
mafischl	0:d9266031f832	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
mafischl	0:d9266031f832	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",
mafischl	0:d9266031f832	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
mafischl	0:d9266031f832	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
mafischl	0:d9266031f832	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
mafischl	0:d9266031f832	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
mafischl	0:d9266031f832	1211	(unsigned)htons(ethhdr->type)));
mafischl	0:d9266031f832	1212
mafischl	0:d9266031f832	1213	type = ethhdr->type;
mafischl	0:d9266031f832	1214	#if ETHARP_SUPPORT_VLAN
mafischl	0:d9266031f832	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
mafischl	0:d9266031f832	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
mafischl	0:d9266031f832	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
mafischl	0:d9266031f832	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
mafischl	0:d9266031f832	1219	/* silently ignore this packet: not for our VLAN */
mafischl	0:d9266031f832	1220	pbuf_free(p);
mafischl	0:d9266031f832	1221	return ERR_OK;
mafischl	0:d9266031f832	1222	}
mafischl	0:d9266031f832	1223	#endif /* ETHARP_VLAN_CHECK */
mafischl	0:d9266031f832	1224	type = vlan->tpid;
mafischl	0:d9266031f832	1225	}
mafischl	0:d9266031f832	1226	#endif /* ETHARP_SUPPORT_VLAN */
mafischl	0:d9266031f832	1227
mafischl	0:d9266031f832	1228	#if LWIP_ARP_FILTER_NETIF
mafischl	0:d9266031f832	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
mafischl	0:d9266031f832	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
mafischl	0:d9266031f832	1231
mafischl	0:d9266031f832	1232	switch (type) {
mafischl	0:d9266031f832	1233	#if LWIP_ARP
mafischl	0:d9266031f832	1234	/* IP packet? */
mafischl	0:d9266031f832	1235	case PP_HTONS(ETHTYPE_IP):
mafischl	0:d9266031f832	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
mafischl	0:d9266031f832	1237	goto free_and_return;
mafischl	0:d9266031f832	1238	}
mafischl	0:d9266031f832	1239	#if ETHARP_TRUST_IP_MAC
mafischl	0:d9266031f832	1240	/* update ARP table */
mafischl	0:d9266031f832	1241	etharp_ip_input(netif, p);
mafischl	0:d9266031f832	1242	#endif /* ETHARP_TRUST_IP_MAC */
mafischl	0:d9266031f832	1243	/* skip Ethernet header */
mafischl	0:d9266031f832	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
mafischl	0:d9266031f832	1245	LWIP_ASSERT("Can't move over header in packet", 0);
mafischl	0:d9266031f832	1246	goto free_and_return;
mafischl	0:d9266031f832	1247	} else {
mafischl	0:d9266031f832	1248	/* pass to IP layer */
mafischl	0:d9266031f832	1249	ip_input(p, netif);
mafischl	0:d9266031f832	1250	}
mafischl	0:d9266031f832	1251	break;
mafischl	0:d9266031f832	1252
mafischl	0:d9266031f832	1253	case PP_HTONS(ETHTYPE_ARP):
mafischl	0:d9266031f832	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
mafischl	0:d9266031f832	1255	goto free_and_return;
mafischl	0:d9266031f832	1256	}
mafischl	0:d9266031f832	1257	/* pass p to ARP module */
mafischl	0:d9266031f832	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
mafischl	0:d9266031f832	1259	break;
mafischl	0:d9266031f832	1260	#endif /* LWIP_ARP */
mafischl	0:d9266031f832	1261	#if PPPOE_SUPPORT
mafischl	0:d9266031f832	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
mafischl	0:d9266031f832	1263	pppoe_disc_input(netif, p);
mafischl	0:d9266031f832	1264	break;
mafischl	0:d9266031f832	1265
mafischl	0:d9266031f832	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
mafischl	0:d9266031f832	1267	pppoe_data_input(netif, p);
mafischl	0:d9266031f832	1268	break;
mafischl	0:d9266031f832	1269	#endif /* PPPOE_SUPPORT */
mafischl	0:d9266031f832	1270
mafischl	0:d9266031f832	1271	default:
mafischl	0:d9266031f832	1272	ETHARP_STATS_INC(etharp.proterr);
mafischl	0:d9266031f832	1273	ETHARP_STATS_INC(etharp.drop);
mafischl	0:d9266031f832	1274	goto free_and_return;
mafischl	0:d9266031f832	1275	}
mafischl	0:d9266031f832	1276
mafischl	0:d9266031f832	1277	/* This means the pbuf is freed or consumed,
mafischl	0:d9266031f832	1278	so the caller doesn't have to free it again */
mafischl	0:d9266031f832	1279	return ERR_OK;
mafischl	0:d9266031f832	1280
mafischl	0:d9266031f832	1281	free_and_return:
mafischl	0:d9266031f832	1282	pbuf_free(p);
mafischl	0:d9266031f832	1283	return ERR_OK;
mafischl	0:d9266031f832	1284	}
mafischl	0:d9266031f832	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	13 Oct 2011
Imports:	90
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	3

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NetServices/lwip/netif/etharp.c@0:d9266031f832, 2011-10-13 (annotated)

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