NetServices - Netservices modded to read fragmented HTTP respso…

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Netservices modded to read fragmented HTTP respsonse/payload from special purpose server - 180 bytes only

lwip/netif/etharp.c@0:8f5825f330b0, 2011-09-08 (annotated)

Committer:: RodColeman
Date:: Thu Sep 08 10:41:36 2011 +0000
Revision:: 0:8f5825f330b0

setDataLen hacked to 180bytes

Who changed what in which revision?

User	Revision	Line number	New contents of line
RodColeman	0:8f5825f330b0	1	/**
RodColeman	0:8f5825f330b0	2	* @file
RodColeman	0:8f5825f330b0	3	* Address Resolution Protocol module for IP over Ethernet
RodColeman	0:8f5825f330b0	4	*
RodColeman	0:8f5825f330b0	5	* Functionally, ARP is divided into two parts. The first maps an IP address
RodColeman	0:8f5825f330b0	6	* to a physical address when sending a packet, and the second part answers
RodColeman	0:8f5825f330b0	7	* requests from other machines for our physical address.
RodColeman	0:8f5825f330b0	8	*
RodColeman	0:8f5825f330b0	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
RodColeman	0:8f5825f330b0	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
RodColeman	0:8f5825f330b0	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
RodColeman	0:8f5825f330b0	12	*/
RodColeman	0:8f5825f330b0	13
RodColeman	0:8f5825f330b0	14	/*
RodColeman	0:8f5825f330b0	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
RodColeman	0:8f5825f330b0	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
RodColeman	0:8f5825f330b0	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
RodColeman	0:8f5825f330b0	18	* All rights reserved.
RodColeman	0:8f5825f330b0	19	*
RodColeman	0:8f5825f330b0	20	* Redistribution and use in source and binary forms, with or without modification,
RodColeman	0:8f5825f330b0	21	* are permitted provided that the following conditions are met:
RodColeman	0:8f5825f330b0	22	*
RodColeman	0:8f5825f330b0	23	* 1. Redistributions of source code must retain the above copyright notice,
RodColeman	0:8f5825f330b0	24	* this list of conditions and the following disclaimer.
RodColeman	0:8f5825f330b0	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
RodColeman	0:8f5825f330b0	26	* this list of conditions and the following disclaimer in the documentation
RodColeman	0:8f5825f330b0	27	* and/or other materials provided with the distribution.
RodColeman	0:8f5825f330b0	28	* 3. The name of the author may not be used to endorse or promote products
RodColeman	0:8f5825f330b0	29	* derived from this software without specific prior written permission.
RodColeman	0:8f5825f330b0	30	*
RodColeman	0:8f5825f330b0	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
RodColeman	0:8f5825f330b0	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
RodColeman	0:8f5825f330b0	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
RodColeman	0:8f5825f330b0	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
RodColeman	0:8f5825f330b0	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
RodColeman	0:8f5825f330b0	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
RodColeman	0:8f5825f330b0	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
RodColeman	0:8f5825f330b0	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
RodColeman	0:8f5825f330b0	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
RodColeman	0:8f5825f330b0	40	* OF SUCH DAMAGE.
RodColeman	0:8f5825f330b0	41	*
RodColeman	0:8f5825f330b0	42	* This file is part of the lwIP TCP/IP stack.
RodColeman	0:8f5825f330b0	43	*
RodColeman	0:8f5825f330b0	44	*/
RodColeman	0:8f5825f330b0	45
RodColeman	0:8f5825f330b0	46	#include "lwip/opt.h"
RodColeman	0:8f5825f330b0	47
RodColeman	0:8f5825f330b0	48	#if LWIP_ARP \|\| LWIP_ETHERNET
RodColeman	0:8f5825f330b0	49
RodColeman	0:8f5825f330b0	50	#include "lwip/ip_addr.h"
RodColeman	0:8f5825f330b0	51	#include "lwip/def.h"
RodColeman	0:8f5825f330b0	52	#include "lwip/ip.h"
RodColeman	0:8f5825f330b0	53	#include "lwip/stats.h"
RodColeman	0:8f5825f330b0	54	#include "lwip/snmp.h"
RodColeman	0:8f5825f330b0	55	#include "lwip/dhcp.h"
RodColeman	0:8f5825f330b0	56	#include "lwip/autoip.h"
RodColeman	0:8f5825f330b0	57	#include "netif/etharp.h"
RodColeman	0:8f5825f330b0	58
RodColeman	0:8f5825f330b0	59	#if PPPOE_SUPPORT
RodColeman	0:8f5825f330b0	60	#include "netif/ppp_oe.h"
RodColeman	0:8f5825f330b0	61	#endif /* PPPOE_SUPPORT */
RodColeman	0:8f5825f330b0	62
RodColeman	0:8f5825f330b0	63	#include <string.h>
RodColeman	0:8f5825f330b0	64
RodColeman	0:8f5825f330b0	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
RodColeman	0:8f5825f330b0	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
RodColeman	0:8f5825f330b0	67
RodColeman	0:8f5825f330b0	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
RodColeman	0:8f5825f330b0	69
RodColeman	0:8f5825f330b0	70	/** the time an ARP entry stays valid after its last update,
RodColeman	0:8f5825f330b0	71	* for ARP_TMR_INTERVAL = 5000, this is
RodColeman	0:8f5825f330b0	72	* (240 * 5) seconds = 20 minutes.
RodColeman	0:8f5825f330b0	73	*/
RodColeman	0:8f5825f330b0	74	#define ARP_MAXAGE 240
RodColeman	0:8f5825f330b0	75	/** the time an ARP entry stays pending after first request,
RodColeman	0:8f5825f330b0	76	* for ARP_TMR_INTERVAL = 5000, this is
RodColeman	0:8f5825f330b0	77	* (2 * 5) seconds = 10 seconds.
RodColeman	0:8f5825f330b0	78	*
RodColeman	0:8f5825f330b0	79	* @internal Keep this number at least 2, otherwise it might
RodColeman	0:8f5825f330b0	80	* run out instantly if the timeout occurs directly after a request.
RodColeman	0:8f5825f330b0	81	*/
RodColeman	0:8f5825f330b0	82	#define ARP_MAXPENDING 2
RodColeman	0:8f5825f330b0	83
RodColeman	0:8f5825f330b0	84	#define HWTYPE_ETHERNET 1
RodColeman	0:8f5825f330b0	85
RodColeman	0:8f5825f330b0	86	enum etharp_state {
RodColeman	0:8f5825f330b0	87	ETHARP_STATE_EMPTY = 0,
RodColeman	0:8f5825f330b0	88	ETHARP_STATE_PENDING,
RodColeman	0:8f5825f330b0	89	ETHARP_STATE_STABLE
RodColeman	0:8f5825f330b0	90	};
RodColeman	0:8f5825f330b0	91
RodColeman	0:8f5825f330b0	92	struct etharp_entry {
RodColeman	0:8f5825f330b0	93	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
RodColeman	0:8f5825f330b0	95	struct etharp_q_entry *q;
RodColeman	0:8f5825f330b0	96	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	97	ip_addr_t ipaddr;
RodColeman	0:8f5825f330b0	98	struct eth_addr ethaddr;
RodColeman	0:8f5825f330b0	99	#if LWIP_SNMP
RodColeman	0:8f5825f330b0	100	struct netif *netif;
RodColeman	0:8f5825f330b0	101	#endif /* LWIP_SNMP */
RodColeman	0:8f5825f330b0	102	u8_t state;
RodColeman	0:8f5825f330b0	103	u8_t ctime;
RodColeman	0:8f5825f330b0	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	105	u8_t static_entry;
RodColeman	0:8f5825f330b0	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	107	};
RodColeman	0:8f5825f330b0	108
RodColeman	0:8f5825f330b0	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
RodColeman	0:8f5825f330b0	110
RodColeman	0:8f5825f330b0	111	#if !LWIP_NETIF_HWADDRHINT
RodColeman	0:8f5825f330b0	112	static u8_t etharp_cached_entry;
RodColeman	0:8f5825f330b0	113	#endif /* !LWIP_NETIF_HWADDRHINT */
RodColeman	0:8f5825f330b0	114
RodColeman	0:8f5825f330b0	115	/** Try hard to create a new entry - we want the IP address to appear in
RodColeman	0:8f5825f330b0	116	the cache (even if this means removing an active entry or so). */
RodColeman	0:8f5825f330b0	117	#define ETHARP_FLAG_TRY_HARD 1
RodColeman	0:8f5825f330b0	118	#define ETHARP_FLAG_FIND_ONLY 2
RodColeman	0:8f5825f330b0	119	#define ETHARP_FLAG_STATIC_ENTRY 4
RodColeman	0:8f5825f330b0	120
RodColeman	0:8f5825f330b0	121	#if LWIP_NETIF_HWADDRHINT
RodColeman	0:8f5825f330b0	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
RodColeman	0:8f5825f330b0	123	*((netif)->addr_hint) = (hint);
RodColeman	0:8f5825f330b0	124	#else /* LWIP_NETIF_HWADDRHINT */
RodColeman	0:8f5825f330b0	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
RodColeman	0:8f5825f330b0	126	#endif /* LWIP_NETIF_HWADDRHINT */
RodColeman	0:8f5825f330b0	127
RodColeman	0:8f5825f330b0	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
RodColeman	0:8f5825f330b0	129
RodColeman	0:8f5825f330b0	130
RodColeman	0:8f5825f330b0	131	/* Some checks, instead of etharp_init(): */
RodColeman	0:8f5825f330b0	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
RodColeman	0:8f5825f330b0	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
RodColeman	0:8f5825f330b0	134	#endif
RodColeman	0:8f5825f330b0	135
RodColeman	0:8f5825f330b0	136
RodColeman	0:8f5825f330b0	137	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	138	/**
RodColeman	0:8f5825f330b0	139	* Free a complete queue of etharp entries
RodColeman	0:8f5825f330b0	140	*
RodColeman	0:8f5825f330b0	141	* @param q a qeueue of etharp_q_entry's to free
RodColeman	0:8f5825f330b0	142	*/
RodColeman	0:8f5825f330b0	143	static void
RodColeman	0:8f5825f330b0	144	free_etharp_q(struct etharp_q_entry *q)
RodColeman	0:8f5825f330b0	145	{
RodColeman	0:8f5825f330b0	146	struct etharp_q_entry *r;
RodColeman	0:8f5825f330b0	147	LWIP_ASSERT("q != NULL", q != NULL);
RodColeman	0:8f5825f330b0	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
RodColeman	0:8f5825f330b0	149	while (q) {
RodColeman	0:8f5825f330b0	150	r = q;
RodColeman	0:8f5825f330b0	151	q = q->next;
RodColeman	0:8f5825f330b0	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
RodColeman	0:8f5825f330b0	153	pbuf_free(r->p);
RodColeman	0:8f5825f330b0	154	memp_free(MEMP_ARP_QUEUE, r);
RodColeman	0:8f5825f330b0	155	}
RodColeman	0:8f5825f330b0	156	}
RodColeman	0:8f5825f330b0	157	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	158
RodColeman	0:8f5825f330b0	159	/** Clean up ARP table entries */
RodColeman	0:8f5825f330b0	160	static void
RodColeman	0:8f5825f330b0	161	free_entry(int i)
RodColeman	0:8f5825f330b0	162	{
RodColeman	0:8f5825f330b0	163	/* remove from SNMP ARP index tree */
RodColeman	0:8f5825f330b0	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
RodColeman	0:8f5825f330b0	165	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	166	/* and empty packet queue */
RodColeman	0:8f5825f330b0	167	if (arp_table[i].q != NULL) {
RodColeman	0:8f5825f330b0	168	/* remove all queued packets */
RodColeman	0:8f5825f330b0	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
RodColeman	0:8f5825f330b0	170	free_etharp_q(arp_table[i].q);
RodColeman	0:8f5825f330b0	171	arp_table[i].q = NULL;
RodColeman	0:8f5825f330b0	172	}
RodColeman	0:8f5825f330b0	173	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	174	/* recycle entry for re-use */
RodColeman	0:8f5825f330b0	175	arp_table[i].state = ETHARP_STATE_EMPTY;
RodColeman	0:8f5825f330b0	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	177	arp_table[i].static_entry = 0;
RodColeman	0:8f5825f330b0	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	179	#ifdef LWIP_DEBUG
RodColeman	0:8f5825f330b0	180	/* for debugging, clean out the complete entry */
RodColeman	0:8f5825f330b0	181	arp_table[i].ctime = 0;
RodColeman	0:8f5825f330b0	182	#if LWIP_SNMP
RodColeman	0:8f5825f330b0	183	arp_table[i].netif = NULL;
RodColeman	0:8f5825f330b0	184	#endif /* LWIP_SNMP */
RodColeman	0:8f5825f330b0	185	ip_addr_set_zero(&arp_table[i].ipaddr);
RodColeman	0:8f5825f330b0	186	arp_table[i].ethaddr = ethzero;
RodColeman	0:8f5825f330b0	187	#endif /* LWIP_DEBUG */
RodColeman	0:8f5825f330b0	188	}
RodColeman	0:8f5825f330b0	189
RodColeman	0:8f5825f330b0	190	/**
RodColeman	0:8f5825f330b0	191	* Clears expired entries in the ARP table.
RodColeman	0:8f5825f330b0	192	*
RodColeman	0:8f5825f330b0	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
RodColeman	0:8f5825f330b0	194	* in order to expire entries in the ARP table.
RodColeman	0:8f5825f330b0	195	*/
RodColeman	0:8f5825f330b0	196	void
RodColeman	0:8f5825f330b0	197	etharp_tmr(void)
RodColeman	0:8f5825f330b0	198	{
RodColeman	0:8f5825f330b0	199	u8_t i;
RodColeman	0:8f5825f330b0	200
RodColeman	0:8f5825f330b0	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
RodColeman	0:8f5825f330b0	202	/* remove expired entries from the ARP table */
RodColeman	0:8f5825f330b0	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
RodColeman	0:8f5825f330b0	204	u8_t state = arp_table[i].state;
RodColeman	0:8f5825f330b0	205	if (state != ETHARP_STATE_EMPTY
RodColeman	0:8f5825f330b0	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	207	&& (arp_table[i].static_entry == 0)
RodColeman	0:8f5825f330b0	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	209	) {
RodColeman	0:8f5825f330b0	210	arp_table[i].ctime++;
RodColeman	0:8f5825f330b0	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
RodColeman	0:8f5825f330b0	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
RodColeman	0:8f5825f330b0	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
RodColeman	0:8f5825f330b0	214	/* pending or stable entry has become old! */
RodColeman	0:8f5825f330b0	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
RodColeman	0:8f5825f330b0	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
RodColeman	0:8f5825f330b0	217	/* clean up entries that have just been expired */
RodColeman	0:8f5825f330b0	218	free_entry(i);
RodColeman	0:8f5825f330b0	219	}
RodColeman	0:8f5825f330b0	220	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	221	/* still pending entry? (not expired) */
RodColeman	0:8f5825f330b0	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
RodColeman	0:8f5825f330b0	223	/* resend an ARP query here? */
RodColeman	0:8f5825f330b0	224	}
RodColeman	0:8f5825f330b0	225	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	226	}
RodColeman	0:8f5825f330b0	227	}
RodColeman	0:8f5825f330b0	228	}
RodColeman	0:8f5825f330b0	229
RodColeman	0:8f5825f330b0	230	/**
RodColeman	0:8f5825f330b0	231	* Search the ARP table for a matching or new entry.
RodColeman	0:8f5825f330b0	232	*
RodColeman	0:8f5825f330b0	233	* If an IP address is given, return a pending or stable ARP entry that matches
RodColeman	0:8f5825f330b0	234	* the address. If no match is found, create a new entry with this address set,
RodColeman	0:8f5825f330b0	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
RodColeman	0:8f5825f330b0	236	* state of the returned entry.
RodColeman	0:8f5825f330b0	237	*
RodColeman	0:8f5825f330b0	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
RodColeman	0:8f5825f330b0	239	*
RodColeman	0:8f5825f330b0	240	* In all cases, attempt to create new entries from an empty entry. If no
RodColeman	0:8f5825f330b0	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
RodColeman	0:8f5825f330b0	242	* old entries. Heuristic choose the least important entry for recycling.
RodColeman	0:8f5825f330b0	243	*
RodColeman	0:8f5825f330b0	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
RodColeman	0:8f5825f330b0	245	* @param flags @see definition of ETHARP_FLAG_*
RodColeman	0:8f5825f330b0	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
RodColeman	0:8f5825f330b0	247	*
RodColeman	0:8f5825f330b0	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
RodColeman	0:8f5825f330b0	249	* entry is found or could be recycled.
RodColeman	0:8f5825f330b0	250	*/
RodColeman	0:8f5825f330b0	251	static s8_t
RodColeman	0:8f5825f330b0	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
RodColeman	0:8f5825f330b0	253	{
RodColeman	0:8f5825f330b0	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
RodColeman	0:8f5825f330b0	255	s8_t empty = ARP_TABLE_SIZE;
RodColeman	0:8f5825f330b0	256	u8_t i = 0, age_pending = 0, age_stable = 0;
RodColeman	0:8f5825f330b0	257	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	258	/* oldest entry with packets on queue */
RodColeman	0:8f5825f330b0	259	s8_t old_queue = ARP_TABLE_SIZE;
RodColeman	0:8f5825f330b0	260	/* its age */
RodColeman	0:8f5825f330b0	261	u8_t age_queue = 0;
RodColeman	0:8f5825f330b0	262	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	263
RodColeman	0:8f5825f330b0	264	/**
RodColeman	0:8f5825f330b0	265	* a) do a search through the cache, remember candidates
RodColeman	0:8f5825f330b0	266	* b) select candidate entry
RodColeman	0:8f5825f330b0	267	* c) create new entry
RodColeman	0:8f5825f330b0	268	*/
RodColeman	0:8f5825f330b0	269
RodColeman	0:8f5825f330b0	270	/* a) in a single search sweep, do all of this
RodColeman	0:8f5825f330b0	271	* 1) remember the first empty entry (if any)
RodColeman	0:8f5825f330b0	272	* 2) remember the oldest stable entry (if any)
RodColeman	0:8f5825f330b0	273	* 3) remember the oldest pending entry without queued packets (if any)
RodColeman	0:8f5825f330b0	274	* 4) remember the oldest pending entry with queued packets (if any)
RodColeman	0:8f5825f330b0	275	* 5) search for a matching IP entry, either pending or stable
RodColeman	0:8f5825f330b0	276	* until 5 matches, or all entries are searched for.
RodColeman	0:8f5825f330b0	277	*/
RodColeman	0:8f5825f330b0	278
RodColeman	0:8f5825f330b0	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
RodColeman	0:8f5825f330b0	280	u8_t state = arp_table[i].state;
RodColeman	0:8f5825f330b0	281	/* no empty entry found yet and now we do find one? */
RodColeman	0:8f5825f330b0	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
RodColeman	0:8f5825f330b0	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
RodColeman	0:8f5825f330b0	284	/* remember first empty entry */
RodColeman	0:8f5825f330b0	285	empty = i;
RodColeman	0:8f5825f330b0	286	} else if (state != ETHARP_STATE_EMPTY) {
RodColeman	0:8f5825f330b0	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
RodColeman	0:8f5825f330b0	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
RodColeman	0:8f5825f330b0	289	/* if given, does IP address match IP address in ARP entry? */
RodColeman	0:8f5825f330b0	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
RodColeman	0:8f5825f330b0	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
RodColeman	0:8f5825f330b0	292	/* found exact IP address match, simply bail out */
RodColeman	0:8f5825f330b0	293	return i;
RodColeman	0:8f5825f330b0	294	}
RodColeman	0:8f5825f330b0	295	/* pending entry? */
RodColeman	0:8f5825f330b0	296	if (state == ETHARP_STATE_PENDING) {
RodColeman	0:8f5825f330b0	297	/* pending with queued packets? */
RodColeman	0:8f5825f330b0	298	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	299	if (arp_table[i].q != NULL) {
RodColeman	0:8f5825f330b0	300	if (arp_table[i].ctime >= age_queue) {
RodColeman	0:8f5825f330b0	301	old_queue = i;
RodColeman	0:8f5825f330b0	302	age_queue = arp_table[i].ctime;
RodColeman	0:8f5825f330b0	303	}
RodColeman	0:8f5825f330b0	304	} else
RodColeman	0:8f5825f330b0	305	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	306	/* pending without queued packets? */
RodColeman	0:8f5825f330b0	307	{
RodColeman	0:8f5825f330b0	308	if (arp_table[i].ctime >= age_pending) {
RodColeman	0:8f5825f330b0	309	old_pending = i;
RodColeman	0:8f5825f330b0	310	age_pending = arp_table[i].ctime;
RodColeman	0:8f5825f330b0	311	}
RodColeman	0:8f5825f330b0	312	}
RodColeman	0:8f5825f330b0	313	/* stable entry? */
RodColeman	0:8f5825f330b0	314	} else if (state == ETHARP_STATE_STABLE) {
RodColeman	0:8f5825f330b0	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	316	/* don't record old_stable for static entries since they never expire */
RodColeman	0:8f5825f330b0	317	if (arp_table[i].static_entry == 0)
RodColeman	0:8f5825f330b0	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	319	{
RodColeman	0:8f5825f330b0	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
RodColeman	0:8f5825f330b0	321	if (arp_table[i].ctime >= age_stable) {
RodColeman	0:8f5825f330b0	322	old_stable = i;
RodColeman	0:8f5825f330b0	323	age_stable = arp_table[i].ctime;
RodColeman	0:8f5825f330b0	324	}
RodColeman	0:8f5825f330b0	325	}
RodColeman	0:8f5825f330b0	326	}
RodColeman	0:8f5825f330b0	327	}
RodColeman	0:8f5825f330b0	328	}
RodColeman	0:8f5825f330b0	329	/* { we have no match } => try to create a new entry */
RodColeman	0:8f5825f330b0	330
RodColeman	0:8f5825f330b0	331	/* don't create new entry, only search? */
RodColeman	0:8f5825f330b0	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
RodColeman	0:8f5825f330b0	333	/* or no empty entry found and not allowed to recycle? */
RodColeman	0:8f5825f330b0	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
RodColeman	0:8f5825f330b0	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
RodColeman	0:8f5825f330b0	336	return (s8_t)ERR_MEM;
RodColeman	0:8f5825f330b0	337	}
RodColeman	0:8f5825f330b0	338
RodColeman	0:8f5825f330b0	339	/* b) choose the least destructive entry to recycle:
RodColeman	0:8f5825f330b0	340	* 1) empty entry
RodColeman	0:8f5825f330b0	341	* 2) oldest stable entry
RodColeman	0:8f5825f330b0	342	* 3) oldest pending entry without queued packets
RodColeman	0:8f5825f330b0	343	* 4) oldest pending entry with queued packets
RodColeman	0:8f5825f330b0	344	*
RodColeman	0:8f5825f330b0	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
RodColeman	0:8f5825f330b0	346	*/
RodColeman	0:8f5825f330b0	347
RodColeman	0:8f5825f330b0	348	/* 1) empty entry available? */
RodColeman	0:8f5825f330b0	349	if (empty < ARP_TABLE_SIZE) {
RodColeman	0:8f5825f330b0	350	i = empty;
RodColeman	0:8f5825f330b0	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
RodColeman	0:8f5825f330b0	352	} else {
RodColeman	0:8f5825f330b0	353	/* 2) found recyclable stable entry? */
RodColeman	0:8f5825f330b0	354	if (old_stable < ARP_TABLE_SIZE) {
RodColeman	0:8f5825f330b0	355	/* recycle oldest stable*/
RodColeman	0:8f5825f330b0	356	i = old_stable;
RodColeman	0:8f5825f330b0	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
RodColeman	0:8f5825f330b0	358	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	359	/* no queued packets should exist on stable entries */
RodColeman	0:8f5825f330b0	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
RodColeman	0:8f5825f330b0	361	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	362	/* 3) found recyclable pending entry without queued packets? */
RodColeman	0:8f5825f330b0	363	} else if (old_pending < ARP_TABLE_SIZE) {
RodColeman	0:8f5825f330b0	364	/* recycle oldest pending */
RodColeman	0:8f5825f330b0	365	i = old_pending;
RodColeman	0:8f5825f330b0	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
RodColeman	0:8f5825f330b0	367	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	368	/* 4) found recyclable pending entry with queued packets? */
RodColeman	0:8f5825f330b0	369	} else if (old_queue < ARP_TABLE_SIZE) {
RodColeman	0:8f5825f330b0	370	/* recycle oldest pending (queued packets are free in free_entry) */
RodColeman	0:8f5825f330b0	371	i = old_queue;
RodColeman	0:8f5825f330b0	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)));
RodColeman	0:8f5825f330b0	373	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	374	/* no empty or recyclable entries found */
RodColeman	0:8f5825f330b0	375	} else {
RodColeman	0:8f5825f330b0	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
RodColeman	0:8f5825f330b0	377	return (s8_t)ERR_MEM;
RodColeman	0:8f5825f330b0	378	}
RodColeman	0:8f5825f330b0	379
RodColeman	0:8f5825f330b0	380	/* { empty or recyclable entry found } */
RodColeman	0:8f5825f330b0	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
RodColeman	0:8f5825f330b0	382	free_entry(i);
RodColeman	0:8f5825f330b0	383	}
RodColeman	0:8f5825f330b0	384
RodColeman	0:8f5825f330b0	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
RodColeman	0:8f5825f330b0	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
RodColeman	0:8f5825f330b0	387	arp_table[i].state == ETHARP_STATE_EMPTY);
RodColeman	0:8f5825f330b0	388
RodColeman	0:8f5825f330b0	389	/* IP address given? */
RodColeman	0:8f5825f330b0	390	if (ipaddr != NULL) {
RodColeman	0:8f5825f330b0	391	/* set IP address */
RodColeman	0:8f5825f330b0	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
RodColeman	0:8f5825f330b0	393	}
RodColeman	0:8f5825f330b0	394	arp_table[i].ctime = 0;
RodColeman	0:8f5825f330b0	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	396	arp_table[i].static_entry = 0;
RodColeman	0:8f5825f330b0	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	398	return (err_t)i;
RodColeman	0:8f5825f330b0	399	}
RodColeman	0:8f5825f330b0	400
RodColeman	0:8f5825f330b0	401	/**
RodColeman	0:8f5825f330b0	402	* Send an IP packet on the network using netif->linkoutput
RodColeman	0:8f5825f330b0	403	* The ethernet header is filled in before sending.
RodColeman	0:8f5825f330b0	404	*
RodColeman	0:8f5825f330b0	405	* @params netif the lwIP network interface on which to send the packet
RodColeman	0:8f5825f330b0	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
RodColeman	0:8f5825f330b0	407	* @params src the source MAC address to be copied into the ethernet header
RodColeman	0:8f5825f330b0	408	* @params dst the destination MAC address to be copied into the ethernet header
RodColeman	0:8f5825f330b0	409	* @return ERR_OK if the packet was sent, any other err_t on failure
RodColeman	0:8f5825f330b0	410	*/
RodColeman	0:8f5825f330b0	411	static err_t
RodColeman	0:8f5825f330b0	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
RodColeman	0:8f5825f330b0	413	{
RodColeman	0:8f5825f330b0	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
RodColeman	0:8f5825f330b0	415
RodColeman	0:8f5825f330b0	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
RodColeman	0:8f5825f330b0	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
RodColeman	0:8f5825f330b0	418	ETHADDR32_COPY(&ethhdr->dest, dst);
RodColeman	0:8f5825f330b0	419	ETHADDR16_COPY(&ethhdr->src, src);
RodColeman	0:8f5825f330b0	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
RodColeman	0:8f5825f330b0	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
RodColeman	0:8f5825f330b0	422	/* send the packet */
RodColeman	0:8f5825f330b0	423	return netif->linkoutput(netif, p);
RodColeman	0:8f5825f330b0	424	}
RodColeman	0:8f5825f330b0	425
RodColeman	0:8f5825f330b0	426	/**
RodColeman	0:8f5825f330b0	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
RodColeman	0:8f5825f330b0	428	*
RodColeman	0:8f5825f330b0	429	* If a pending entry is resolved, any queued packets will be sent
RodColeman	0:8f5825f330b0	430	* at this point.
RodColeman	0:8f5825f330b0	431	*
RodColeman	0:8f5825f330b0	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
RodColeman	0:8f5825f330b0	433	* @param ipaddr IP address of the inserted ARP entry.
RodColeman	0:8f5825f330b0	434	* @param ethaddr Ethernet address of the inserted ARP entry.
RodColeman	0:8f5825f330b0	435	* @param flags @see definition of ETHARP_FLAG_*
RodColeman	0:8f5825f330b0	436	*
RodColeman	0:8f5825f330b0	437	* @return
RodColeman	0:8f5825f330b0	438	* - ERR_OK Succesfully updated ARP cache.
RodColeman	0:8f5825f330b0	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
RodColeman	0:8f5825f330b0	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
RodColeman	0:8f5825f330b0	441	*
RodColeman	0:8f5825f330b0	442	* @see pbuf_free()
RodColeman	0:8f5825f330b0	443	*/
RodColeman	0:8f5825f330b0	444	static err_t
RodColeman	0:8f5825f330b0	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
RodColeman	0:8f5825f330b0	446	{
RodColeman	0:8f5825f330b0	447	s8_t i;
RodColeman	0:8f5825f330b0	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
RodColeman	0:8f5825f330b0	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",
RodColeman	0:8f5825f330b0	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
RodColeman	0:8f5825f330b0	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
RodColeman	0:8f5825f330b0	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
RodColeman	0:8f5825f330b0	453	/* non-unicast address? */
RodColeman	0:8f5825f330b0	454	if (ip_addr_isany(ipaddr) \|\|
RodColeman	0:8f5825f330b0	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
RodColeman	0:8f5825f330b0	456	ip_addr_ismulticast(ipaddr)) {
RodColeman	0:8f5825f330b0	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
RodColeman	0:8f5825f330b0	458	return ERR_ARG;
RodColeman	0:8f5825f330b0	459	}
RodColeman	0:8f5825f330b0	460	/* find or create ARP entry */
RodColeman	0:8f5825f330b0	461	i = find_entry(ipaddr, flags);
RodColeman	0:8f5825f330b0	462	/* bail out if no entry could be found */
RodColeman	0:8f5825f330b0	463	if (i < 0) {
RodColeman	0:8f5825f330b0	464	return (err_t)i;
RodColeman	0:8f5825f330b0	465	}
RodColeman	0:8f5825f330b0	466
RodColeman	0:8f5825f330b0	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
RodColeman	0:8f5825f330b0	469	/* record static type */
RodColeman	0:8f5825f330b0	470	arp_table[i].static_entry = 1;
RodColeman	0:8f5825f330b0	471	}
RodColeman	0:8f5825f330b0	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	473
RodColeman	0:8f5825f330b0	474	/* mark it stable */
RodColeman	0:8f5825f330b0	475	arp_table[i].state = ETHARP_STATE_STABLE;
RodColeman	0:8f5825f330b0	476
RodColeman	0:8f5825f330b0	477	#if LWIP_SNMP
RodColeman	0:8f5825f330b0	478	/* record network interface */
RodColeman	0:8f5825f330b0	479	arp_table[i].netif = netif;
RodColeman	0:8f5825f330b0	480	#endif /* LWIP_SNMP */
RodColeman	0:8f5825f330b0	481	/* insert in SNMP ARP index tree */
RodColeman	0:8f5825f330b0	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
RodColeman	0:8f5825f330b0	483
RodColeman	0:8f5825f330b0	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
RodColeman	0:8f5825f330b0	485	/* update address */
RodColeman	0:8f5825f330b0	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
RodColeman	0:8f5825f330b0	487	/* reset time stamp */
RodColeman	0:8f5825f330b0	488	arp_table[i].ctime = 0;
RodColeman	0:8f5825f330b0	489	#if ARP_QUEUEING
RodColeman	0:8f5825f330b0	490	/* this is where we will send out queued packets! */
RodColeman	0:8f5825f330b0	491	while (arp_table[i].q != NULL) {
RodColeman	0:8f5825f330b0	492	struct pbuf *p;
RodColeman	0:8f5825f330b0	493	/* remember remainder of queue */
RodColeman	0:8f5825f330b0	494	struct etharp_q_entry *q = arp_table[i].q;
RodColeman	0:8f5825f330b0	495	/* pop first item off the queue */
RodColeman	0:8f5825f330b0	496	arp_table[i].q = q->next;
RodColeman	0:8f5825f330b0	497	/* get the packet pointer */
RodColeman	0:8f5825f330b0	498	p = q->p;
RodColeman	0:8f5825f330b0	499	/* now queue entry can be freed */
RodColeman	0:8f5825f330b0	500	memp_free(MEMP_ARP_QUEUE, q);
RodColeman	0:8f5825f330b0	501	/* send the queued IP packet */
RodColeman	0:8f5825f330b0	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
RodColeman	0:8f5825f330b0	503	/* free the queued IP packet */
RodColeman	0:8f5825f330b0	504	pbuf_free(p);
RodColeman	0:8f5825f330b0	505	}
RodColeman	0:8f5825f330b0	506	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	507	return ERR_OK;
RodColeman	0:8f5825f330b0	508	}
RodColeman	0:8f5825f330b0	509
RodColeman	0:8f5825f330b0	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
RodColeman	0:8f5825f330b0	511	/** Add a new static entry to the ARP table. If an entry exists for the
RodColeman	0:8f5825f330b0	512	* specified IP address, this entry is overwritten.
RodColeman	0:8f5825f330b0	513	* If packets are queued for the specified IP address, they are sent out.
RodColeman	0:8f5825f330b0	514	*
RodColeman	0:8f5825f330b0	515	* @param ipaddr IP address for the new static entry
RodColeman	0:8f5825f330b0	516	* @param ethaddr ethernet address for the new static entry
RodColeman	0:8f5825f330b0	517	* @return @see return values of etharp_add_static_entry
RodColeman	0:8f5825f330b0	518	*/
RodColeman	0:8f5825f330b0	519	err_t
RodColeman	0:8f5825f330b0	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
RodColeman	0:8f5825f330b0	521	{
RodColeman	0:8f5825f330b0	522	struct netif *netif;
RodColeman	0:8f5825f330b0	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",
RodColeman	0:8f5825f330b0	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
RodColeman	0:8f5825f330b0	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
RodColeman	0:8f5825f330b0	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
RodColeman	0:8f5825f330b0	527
RodColeman	0:8f5825f330b0	528	netif = ip_route(ipaddr);
RodColeman	0:8f5825f330b0	529	if (netif == NULL) {
RodColeman	0:8f5825f330b0	530	return ERR_RTE;
RodColeman	0:8f5825f330b0	531	}
RodColeman	0:8f5825f330b0	532
RodColeman	0:8f5825f330b0	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
RodColeman	0:8f5825f330b0	534	}
RodColeman	0:8f5825f330b0	535
RodColeman	0:8f5825f330b0	536	/** Remove a static entry from the ARP table previously added with a call to
RodColeman	0:8f5825f330b0	537	* etharp_add_static_entry.
RodColeman	0:8f5825f330b0	538	*
RodColeman	0:8f5825f330b0	539	* @param ipaddr IP address of the static entry to remove
RodColeman	0:8f5825f330b0	540	* @return ERR_OK: entry removed
RodColeman	0:8f5825f330b0	541	* ERR_MEM: entry wasn't found
RodColeman	0:8f5825f330b0	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
RodColeman	0:8f5825f330b0	543	*/
RodColeman	0:8f5825f330b0	544	err_t
RodColeman	0:8f5825f330b0	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
RodColeman	0:8f5825f330b0	546	{
RodColeman	0:8f5825f330b0	547	s8_t i;
RodColeman	0:8f5825f330b0	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
RodColeman	0:8f5825f330b0	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
RodColeman	0:8f5825f330b0	550
RodColeman	0:8f5825f330b0	551	/* find or create ARP entry */
RodColeman	0:8f5825f330b0	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
RodColeman	0:8f5825f330b0	553	/* bail out if no entry could be found */
RodColeman	0:8f5825f330b0	554	if (i < 0) {
RodColeman	0:8f5825f330b0	555	return (err_t)i;
RodColeman	0:8f5825f330b0	556	}
RodColeman	0:8f5825f330b0	557
RodColeman	0:8f5825f330b0	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
RodColeman	0:8f5825f330b0	559	(arp_table[i].static_entry == 0)) {
RodColeman	0:8f5825f330b0	560	/* entry wasn't a static entry, cannot remove it */
RodColeman	0:8f5825f330b0	561	return ERR_ARG;
RodColeman	0:8f5825f330b0	562	}
RodColeman	0:8f5825f330b0	563	/* entry found, free it */
RodColeman	0:8f5825f330b0	564	free_entry(i);
RodColeman	0:8f5825f330b0	565	return ERR_OK;
RodColeman	0:8f5825f330b0	566	}
RodColeman	0:8f5825f330b0	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
RodColeman	0:8f5825f330b0	568
RodColeman	0:8f5825f330b0	569	/**
RodColeman	0:8f5825f330b0	570	* Finds (stable) ethernet/IP address pair from ARP table
RodColeman	0:8f5825f330b0	571	* using interface and IP address index.
RodColeman	0:8f5825f330b0	572	* @note the addresses in the ARP table are in network order!
RodColeman	0:8f5825f330b0	573	*
RodColeman	0:8f5825f330b0	574	* @param netif points to interface index
RodColeman	0:8f5825f330b0	575	* @param ipaddr points to the (network order) IP address index
RodColeman	0:8f5825f330b0	576	* @param eth_ret points to return pointer
RodColeman	0:8f5825f330b0	577	* @param ip_ret points to return pointer
RodColeman	0:8f5825f330b0	578	* @return table index if found, -1 otherwise
RodColeman	0:8f5825f330b0	579	*/
RodColeman	0:8f5825f330b0	580	s8_t
RodColeman	0:8f5825f330b0	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
RodColeman	0:8f5825f330b0	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
RodColeman	0:8f5825f330b0	583	{
RodColeman	0:8f5825f330b0	584	s8_t i;
RodColeman	0:8f5825f330b0	585
RodColeman	0:8f5825f330b0	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
RodColeman	0:8f5825f330b0	587	eth_ret != NULL && ip_ret != NULL);
RodColeman	0:8f5825f330b0	588
RodColeman	0:8f5825f330b0	589	LWIP_UNUSED_ARG(netif);
RodColeman	0:8f5825f330b0	590
RodColeman	0:8f5825f330b0	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
RodColeman	0:8f5825f330b0	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
RodColeman	0:8f5825f330b0	593	*eth_ret = &arp_table[i].ethaddr;
RodColeman	0:8f5825f330b0	594	*ip_ret = &arp_table[i].ipaddr;
RodColeman	0:8f5825f330b0	595	return i;
RodColeman	0:8f5825f330b0	596	}
RodColeman	0:8f5825f330b0	597	return -1;
RodColeman	0:8f5825f330b0	598	}
RodColeman	0:8f5825f330b0	599
RodColeman	0:8f5825f330b0	600	#if ETHARP_TRUST_IP_MAC
RodColeman	0:8f5825f330b0	601	/**
RodColeman	0:8f5825f330b0	602	* Updates the ARP table using the given IP packet.
RodColeman	0:8f5825f330b0	603	*
RodColeman	0:8f5825f330b0	604	* Uses the incoming IP packet's source address to update the
RodColeman	0:8f5825f330b0	605	* ARP cache for the local network. The function does not alter
RodColeman	0:8f5825f330b0	606	* or free the packet. This function must be called before the
RodColeman	0:8f5825f330b0	607	* packet p is passed to the IP layer.
RodColeman	0:8f5825f330b0	608	*
RodColeman	0:8f5825f330b0	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
RodColeman	0:8f5825f330b0	610	* @param p The IP packet that arrived on netif.
RodColeman	0:8f5825f330b0	611	*
RodColeman	0:8f5825f330b0	612	* @return NULL
RodColeman	0:8f5825f330b0	613	*
RodColeman	0:8f5825f330b0	614	* @see pbuf_free()
RodColeman	0:8f5825f330b0	615	*/
RodColeman	0:8f5825f330b0	616	static void
RodColeman	0:8f5825f330b0	617	etharp_ip_input(struct netif netif, struct pbuf p)
RodColeman	0:8f5825f330b0	618	{
RodColeman	0:8f5825f330b0	619	struct eth_hdr *ethhdr;
RodColeman	0:8f5825f330b0	620	struct ip_hdr *iphdr;
RodColeman	0:8f5825f330b0	621	ip_addr_t iphdr_src;
RodColeman	0:8f5825f330b0	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
RodColeman	0:8f5825f330b0	623
RodColeman	0:8f5825f330b0	624	/* Only insert an entry if the source IP address of the
RodColeman	0:8f5825f330b0	625	incoming IP packet comes from a host on the local network. */
RodColeman	0:8f5825f330b0	626	ethhdr = (struct eth_hdr *)p->payload;
RodColeman	0:8f5825f330b0	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
RodColeman	0:8f5825f330b0	628	#if ETHARP_SUPPORT_VLAN
RodColeman	0:8f5825f330b0	629	if (ethhdr->type == ETHTYPE_VLAN) {
RodColeman	0:8f5825f330b0	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
RodColeman	0:8f5825f330b0	631	}
RodColeman	0:8f5825f330b0	632	#endif /* ETHARP_SUPPORT_VLAN */
RodColeman	0:8f5825f330b0	633
RodColeman	0:8f5825f330b0	634	ip_addr_copy(iphdr_src, iphdr->src);
RodColeman	0:8f5825f330b0	635
RodColeman	0:8f5825f330b0	636	/* source is not on the local network? */
RodColeman	0:8f5825f330b0	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
RodColeman	0:8f5825f330b0	638	/* do nothing */
RodColeman	0:8f5825f330b0	639	return;
RodColeman	0:8f5825f330b0	640	}
RodColeman	0:8f5825f330b0	641
RodColeman	0:8f5825f330b0	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
RodColeman	0:8f5825f330b0	643	/* update the source IP address in the cache, if present */
RodColeman	0:8f5825f330b0	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
RodColeman	0:8f5825f330b0	645	* back soon (for example, if the destination IP address is ours. */
RodColeman	0:8f5825f330b0	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
RodColeman	0:8f5825f330b0	647	}
RodColeman	0:8f5825f330b0	648	#endif /* ETHARP_TRUST_IP_MAC */
RodColeman	0:8f5825f330b0	649
RodColeman	0:8f5825f330b0	650	/**
RodColeman	0:8f5825f330b0	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
RodColeman	0:8f5825f330b0	652	* send out queued IP packets. Updates cache with snooped address pairs.
RodColeman	0:8f5825f330b0	653	*
RodColeman	0:8f5825f330b0	654	* Should be called for incoming ARP packets. The pbuf in the argument
RodColeman	0:8f5825f330b0	655	* is freed by this function.
RodColeman	0:8f5825f330b0	656	*
RodColeman	0:8f5825f330b0	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
RodColeman	0:8f5825f330b0	658	* @param ethaddr Ethernet address of netif.
RodColeman	0:8f5825f330b0	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
RodColeman	0:8f5825f330b0	660	*
RodColeman	0:8f5825f330b0	661	* @return NULL
RodColeman	0:8f5825f330b0	662	*
RodColeman	0:8f5825f330b0	663	* @see pbuf_free()
RodColeman	0:8f5825f330b0	664	*/
RodColeman	0:8f5825f330b0	665	static void
RodColeman	0:8f5825f330b0	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
RodColeman	0:8f5825f330b0	667	{
RodColeman	0:8f5825f330b0	668	struct etharp_hdr *hdr;
RodColeman	0:8f5825f330b0	669	struct eth_hdr *ethhdr;
RodColeman	0:8f5825f330b0	670	/* these are aligned properly, whereas the ARP header fields might not be */
RodColeman	0:8f5825f330b0	671	ip_addr_t sipaddr, dipaddr;
RodColeman	0:8f5825f330b0	672	u8_t for_us;
RodColeman	0:8f5825f330b0	673	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	674	const u8_t * ethdst_hwaddr;
RodColeman	0:8f5825f330b0	675	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	676
RodColeman	0:8f5825f330b0	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
RodColeman	0:8f5825f330b0	678
RodColeman	0:8f5825f330b0	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
RodColeman	0:8f5825f330b0	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
RodColeman	0:8f5825f330b0	681	if (p->len < SIZEOF_ETHARP_PACKET) {
RodColeman	0:8f5825f330b0	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
RodColeman	0:8f5825f330b0	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
RodColeman	0:8f5825f330b0	684	(s16_t)SIZEOF_ETHARP_PACKET));
RodColeman	0:8f5825f330b0	685	ETHARP_STATS_INC(etharp.lenerr);
RodColeman	0:8f5825f330b0	686	ETHARP_STATS_INC(etharp.drop);
RodColeman	0:8f5825f330b0	687	pbuf_free(p);
RodColeman	0:8f5825f330b0	688	return;
RodColeman	0:8f5825f330b0	689	}
RodColeman	0:8f5825f330b0	690
RodColeman	0:8f5825f330b0	691	ethhdr = (struct eth_hdr *)p->payload;
RodColeman	0:8f5825f330b0	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
RodColeman	0:8f5825f330b0	693	#if ETHARP_SUPPORT_VLAN
RodColeman	0:8f5825f330b0	694	if (ethhdr->type == ETHTYPE_VLAN) {
RodColeman	0:8f5825f330b0	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
RodColeman	0:8f5825f330b0	696	}
RodColeman	0:8f5825f330b0	697	#endif /* ETHARP_SUPPORT_VLAN */
RodColeman	0:8f5825f330b0	698
RodColeman	0:8f5825f330b0	699	/* RFC 826 "Packet Reception": */
RodColeman	0:8f5825f330b0	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
RodColeman	0:8f5825f330b0	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
RodColeman	0:8f5825f330b0	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
RodColeman	0:8f5825f330b0	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
RodColeman	0:8f5825f330b0	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
RodColeman	0:8f5825f330b0	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
RodColeman	0:8f5825f330b0	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",
RodColeman	0:8f5825f330b0	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
RodColeman	0:8f5825f330b0	708	ETHARP_STATS_INC(etharp.proterr);
RodColeman	0:8f5825f330b0	709	ETHARP_STATS_INC(etharp.drop);
RodColeman	0:8f5825f330b0	710	pbuf_free(p);
RodColeman	0:8f5825f330b0	711	return;
RodColeman	0:8f5825f330b0	712	}
RodColeman	0:8f5825f330b0	713	ETHARP_STATS_INC(etharp.recv);
RodColeman	0:8f5825f330b0	714
RodColeman	0:8f5825f330b0	715	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	716	/* We have to check if a host already has configured our random
RodColeman	0:8f5825f330b0	717	* created link local address and continously check if there is
RodColeman	0:8f5825f330b0	718	* a host with this IP-address so we can detect collisions */
RodColeman	0:8f5825f330b0	719	autoip_arp_reply(netif, hdr);
RodColeman	0:8f5825f330b0	720	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	721
RodColeman	0:8f5825f330b0	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
RodColeman	0:8f5825f330b0	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
RodColeman	0:8f5825f330b0	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
RodColeman	0:8f5825f330b0	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
RodColeman	0:8f5825f330b0	726
RodColeman	0:8f5825f330b0	727	/* this interface is not configured? */
RodColeman	0:8f5825f330b0	728	if (ip_addr_isany(&netif->ip_addr)) {
RodColeman	0:8f5825f330b0	729	for_us = 0;
RodColeman	0:8f5825f330b0	730	} else {
RodColeman	0:8f5825f330b0	731	/* ARP packet directed to us? */
RodColeman	0:8f5825f330b0	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
RodColeman	0:8f5825f330b0	733	}
RodColeman	0:8f5825f330b0	734
RodColeman	0:8f5825f330b0	735	/* ARP message directed to us?
RodColeman	0:8f5825f330b0	736	-> add IP address in ARP cache; assume requester wants to talk to us,
RodColeman	0:8f5825f330b0	737	can result in directly sending the queued packets for this host.
RodColeman	0:8f5825f330b0	738	ARP message not directed to us?
RodColeman	0:8f5825f330b0	739	-> update the source IP address in the cache, if present */
RodColeman	0:8f5825f330b0	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
RodColeman	0:8f5825f330b0	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
RodColeman	0:8f5825f330b0	742
RodColeman	0:8f5825f330b0	743	/* now act on the message itself */
RodColeman	0:8f5825f330b0	744	switch (hdr->opcode) {
RodColeman	0:8f5825f330b0	745	/* ARP request? */
RodColeman	0:8f5825f330b0	746	case PP_HTONS(ARP_REQUEST):
RodColeman	0:8f5825f330b0	747	/* ARP request. If it asked for our address, we send out a
RodColeman	0:8f5825f330b0	748	* reply. In any case, we time-stamp any existing ARP entry,
RodColeman	0:8f5825f330b0	749	* and possiby send out an IP packet that was queued on it. */
RodColeman	0:8f5825f330b0	750
RodColeman	0:8f5825f330b0	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
RodColeman	0:8f5825f330b0	752	/* ARP request for our address? */
RodColeman	0:8f5825f330b0	753	if (for_us) {
RodColeman	0:8f5825f330b0	754
RodColeman	0:8f5825f330b0	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
RodColeman	0:8f5825f330b0	756	/* Re-use pbuf to send ARP reply.
RodColeman	0:8f5825f330b0	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
RodColeman	0:8f5825f330b0	758	that would allocate a new pbuf. */
RodColeman	0:8f5825f330b0	759	hdr->opcode = htons(ARP_REPLY);
RodColeman	0:8f5825f330b0	760
RodColeman	0:8f5825f330b0	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
RodColeman	0:8f5825f330b0	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
RodColeman	0:8f5825f330b0	763
RodColeman	0:8f5825f330b0	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
RodColeman	0:8f5825f330b0	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
RodColeman	0:8f5825f330b0	766	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
RodColeman	0:8f5825f330b0	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
RodColeman	0:8f5825f330b0	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
RodColeman	0:8f5825f330b0	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
RodColeman	0:8f5825f330b0	771	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	772
RodColeman	0:8f5825f330b0	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
RodColeman	0:8f5825f330b0	774	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
RodColeman	0:8f5825f330b0	776	#else /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
RodColeman	0:8f5825f330b0	778	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
RodColeman	0:8f5825f330b0	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
RodColeman	0:8f5825f330b0	781
RodColeman	0:8f5825f330b0	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
RodColeman	0:8f5825f330b0	783	are already correct, we tested that before */
RodColeman	0:8f5825f330b0	784
RodColeman	0:8f5825f330b0	785	/* return ARP reply */
RodColeman	0:8f5825f330b0	786	netif->linkoutput(netif, p);
RodColeman	0:8f5825f330b0	787	/* we are not configured? */
RodColeman	0:8f5825f330b0	788	} else if (ip_addr_isany(&netif->ip_addr)) {
RodColeman	0:8f5825f330b0	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
RodColeman	0:8f5825f330b0	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
RodColeman	0:8f5825f330b0	791	/* request was not directed to us */
RodColeman	0:8f5825f330b0	792	} else {
RodColeman	0:8f5825f330b0	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
RodColeman	0:8f5825f330b0	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
RodColeman	0:8f5825f330b0	795	}
RodColeman	0:8f5825f330b0	796	break;
RodColeman	0:8f5825f330b0	797	case PP_HTONS(ARP_REPLY):
RodColeman	0:8f5825f330b0	798	/* ARP reply. We already updated the ARP cache earlier. */
RodColeman	0:8f5825f330b0	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
RodColeman	0:8f5825f330b0	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
RodColeman	0:8f5825f330b0	801	/* DHCP wants to know about ARP replies from any host with an
RodColeman	0:8f5825f330b0	802	* IP address also offered to us by the DHCP server. We do not
RodColeman	0:8f5825f330b0	803	* want to take a duplicate IP address on a single network.
RodColeman	0:8f5825f330b0	804	* @todo How should we handle redundant (fail-over) interfaces? */
RodColeman	0:8f5825f330b0	805	dhcp_arp_reply(netif, &sipaddr);
RodColeman	0:8f5825f330b0	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
RodColeman	0:8f5825f330b0	807	break;
RodColeman	0:8f5825f330b0	808	default:
RodColeman	0:8f5825f330b0	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
RodColeman	0:8f5825f330b0	810	ETHARP_STATS_INC(etharp.err);
RodColeman	0:8f5825f330b0	811	break;
RodColeman	0:8f5825f330b0	812	}
RodColeman	0:8f5825f330b0	813	/* free ARP packet */
RodColeman	0:8f5825f330b0	814	pbuf_free(p);
RodColeman	0:8f5825f330b0	815	}
RodColeman	0:8f5825f330b0	816
RodColeman	0:8f5825f330b0	817	/**
RodColeman	0:8f5825f330b0	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
RodColeman	0:8f5825f330b0	819	*
RodColeman	0:8f5825f330b0	820	* For IP multicast and broadcast, corresponding Ethernet addresses
RodColeman	0:8f5825f330b0	821	* are selected and the packet is transmitted on the link.
RodColeman	0:8f5825f330b0	822	*
RodColeman	0:8f5825f330b0	823	* For unicast addresses, the packet is submitted to etharp_query(). In
RodColeman	0:8f5825f330b0	824	* case the IP address is outside the local network, the IP address of
RodColeman	0:8f5825f330b0	825	* the gateway is used.
RodColeman	0:8f5825f330b0	826	*
RodColeman	0:8f5825f330b0	827	* @param netif The lwIP network interface which the IP packet will be sent on.
RodColeman	0:8f5825f330b0	828	* @param q The pbuf(s) containing the IP packet to be sent.
RodColeman	0:8f5825f330b0	829	* @param ipaddr The IP address of the packet destination.
RodColeman	0:8f5825f330b0	830	*
RodColeman	0:8f5825f330b0	831	* @return
RodColeman	0:8f5825f330b0	832	* - ERR_RTE No route to destination (no gateway to external networks),
RodColeman	0:8f5825f330b0	833	* or the return type of either etharp_query() or etharp_send_ip().
RodColeman	0:8f5825f330b0	834	*/
RodColeman	0:8f5825f330b0	835	err_t
RodColeman	0:8f5825f330b0	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
RodColeman	0:8f5825f330b0	837	{
RodColeman	0:8f5825f330b0	838	struct eth_addr *dest, mcastaddr;
RodColeman	0:8f5825f330b0	839
RodColeman	0:8f5825f330b0	840	/* make room for Ethernet header - should not fail */
RodColeman	0:8f5825f330b0	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
RodColeman	0:8f5825f330b0	842	/* bail out */
RodColeman	0:8f5825f330b0	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
RodColeman	0:8f5825f330b0	844	("etharp_output: could not allocate room for header.\n"));
RodColeman	0:8f5825f330b0	845	LINK_STATS_INC(link.lenerr);
RodColeman	0:8f5825f330b0	846	return ERR_BUF;
RodColeman	0:8f5825f330b0	847	}
RodColeman	0:8f5825f330b0	848
RodColeman	0:8f5825f330b0	849	/* assume unresolved Ethernet address */
RodColeman	0:8f5825f330b0	850	dest = NULL;
RodColeman	0:8f5825f330b0	851	/* Determine on destination hardware address. Broadcasts and multicasts
RodColeman	0:8f5825f330b0	852	* are special, other IP addresses are looked up in the ARP table. */
RodColeman	0:8f5825f330b0	853
RodColeman	0:8f5825f330b0	854	/* broadcast destination IP address? */
RodColeman	0:8f5825f330b0	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
RodColeman	0:8f5825f330b0	856	/* broadcast on Ethernet also */
RodColeman	0:8f5825f330b0	857	dest = (struct eth_addr *)&ethbroadcast;
RodColeman	0:8f5825f330b0	858	/* multicast destination IP address? */
RodColeman	0:8f5825f330b0	859	} else if (ip_addr_ismulticast(ipaddr)) {
RodColeman	0:8f5825f330b0	860	/* Hash IP multicast address to MAC address.*/
RodColeman	0:8f5825f330b0	861	mcastaddr.addr[0] = 0x01;
RodColeman	0:8f5825f330b0	862	mcastaddr.addr[1] = 0x00;
RodColeman	0:8f5825f330b0	863	mcastaddr.addr[2] = 0x5e;
RodColeman	0:8f5825f330b0	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
RodColeman	0:8f5825f330b0	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
RodColeman	0:8f5825f330b0	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
RodColeman	0:8f5825f330b0	867	/* destination Ethernet address is multicast */
RodColeman	0:8f5825f330b0	868	dest = &mcastaddr;
RodColeman	0:8f5825f330b0	869	/* unicast destination IP address? */
RodColeman	0:8f5825f330b0	870	} else {
RodColeman	0:8f5825f330b0	871	/* outside local network? */
RodColeman	0:8f5825f330b0	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
RodColeman	0:8f5825f330b0	873	!ip_addr_islinklocal(ipaddr)) {
RodColeman	0:8f5825f330b0	874	/* interface has default gateway? */
RodColeman	0:8f5825f330b0	875	if (!ip_addr_isany(&netif->gw)) {
RodColeman	0:8f5825f330b0	876	/* send to hardware address of default gateway IP address */
RodColeman	0:8f5825f330b0	877	ipaddr = &(netif->gw);
RodColeman	0:8f5825f330b0	878	/* no default gateway available */
RodColeman	0:8f5825f330b0	879	} else {
RodColeman	0:8f5825f330b0	880	/* no route to destination error (default gateway missing) */
RodColeman	0:8f5825f330b0	881	return ERR_RTE;
RodColeman	0:8f5825f330b0	882	}
RodColeman	0:8f5825f330b0	883	}
RodColeman	0:8f5825f330b0	884	#if LWIP_NETIF_HWADDRHINT
RodColeman	0:8f5825f330b0	885	if (netif->addr_hint != NULL) {
RodColeman	0:8f5825f330b0	886	/* per-pcb cached entry was given */
RodColeman	0:8f5825f330b0	887	u8_t etharp_cached_entry = *(netif->addr_hint);
RodColeman	0:8f5825f330b0	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
RodColeman	0:8f5825f330b0	889	#endif /* LWIP_NETIF_HWADDRHINT */
RodColeman	0:8f5825f330b0	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
RodColeman	0:8f5825f330b0	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
RodColeman	0:8f5825f330b0	892	/* the per-pcb-cached entry is stable and the right one! */
RodColeman	0:8f5825f330b0	893	ETHARP_STATS_INC(etharp.cachehit);
RodColeman	0:8f5825f330b0	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
RodColeman	0:8f5825f330b0	895	&arp_table[etharp_cached_entry].ethaddr);
RodColeman	0:8f5825f330b0	896	}
RodColeman	0:8f5825f330b0	897	#if LWIP_NETIF_HWADDRHINT
RodColeman	0:8f5825f330b0	898	}
RodColeman	0:8f5825f330b0	899	}
RodColeman	0:8f5825f330b0	900	#endif /* LWIP_NETIF_HWADDRHINT */
RodColeman	0:8f5825f330b0	901	/* queue on destination Ethernet address belonging to ipaddr */
RodColeman	0:8f5825f330b0	902	return etharp_query(netif, ipaddr, q);
RodColeman	0:8f5825f330b0	903	}
RodColeman	0:8f5825f330b0	904
RodColeman	0:8f5825f330b0	905	/* continuation for multicast/broadcast destinations */
RodColeman	0:8f5825f330b0	906	/* obtain source Ethernet address of the given interface */
RodColeman	0:8f5825f330b0	907	/* send packet directly on the link */
RodColeman	0:8f5825f330b0	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
RodColeman	0:8f5825f330b0	909	}
RodColeman	0:8f5825f330b0	910
RodColeman	0:8f5825f330b0	911	/**
RodColeman	0:8f5825f330b0	912	* Send an ARP request for the given IP address and/or queue a packet.
RodColeman	0:8f5825f330b0	913	*
RodColeman	0:8f5825f330b0	914	* If the IP address was not yet in the cache, a pending ARP cache entry
RodColeman	0:8f5825f330b0	915	* is added and an ARP request is sent for the given address. The packet
RodColeman	0:8f5825f330b0	916	* is queued on this entry.
RodColeman	0:8f5825f330b0	917	*
RodColeman	0:8f5825f330b0	918	* If the IP address was already pending in the cache, a new ARP request
RodColeman	0:8f5825f330b0	919	* is sent for the given address. The packet is queued on this entry.
RodColeman	0:8f5825f330b0	920	*
RodColeman	0:8f5825f330b0	921	* If the IP address was already stable in the cache, and a packet is
RodColeman	0:8f5825f330b0	922	* given, it is directly sent and no ARP request is sent out.
RodColeman	0:8f5825f330b0	923	*
RodColeman	0:8f5825f330b0	924	* If the IP address was already stable in the cache, and no packet is
RodColeman	0:8f5825f330b0	925	* given, an ARP request is sent out.
RodColeman	0:8f5825f330b0	926	*
RodColeman	0:8f5825f330b0	927	* @param netif The lwIP network interface on which ipaddr
RodColeman	0:8f5825f330b0	928	* must be queried for.
RodColeman	0:8f5825f330b0	929	* @param ipaddr The IP address to be resolved.
RodColeman	0:8f5825f330b0	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
RodColeman	0:8f5825f330b0	931	* q is not freed by this function.
RodColeman	0:8f5825f330b0	932	*
RodColeman	0:8f5825f330b0	933	* @note q must only be ONE packet, not a packet queue!
RodColeman	0:8f5825f330b0	934	*
RodColeman	0:8f5825f330b0	935	* @return
RodColeman	0:8f5825f330b0	936	* - ERR_BUF Could not make room for Ethernet header.
RodColeman	0:8f5825f330b0	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
RodColeman	0:8f5825f330b0	938	* to query for address or queue the packet.
RodColeman	0:8f5825f330b0	939	* - ERR_MEM Could not queue packet due to memory shortage.
RodColeman	0:8f5825f330b0	940	* - ERR_RTE No route to destination (no gateway to external networks).
RodColeman	0:8f5825f330b0	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
RodColeman	0:8f5825f330b0	942	*
RodColeman	0:8f5825f330b0	943	*/
RodColeman	0:8f5825f330b0	944	err_t
RodColeman	0:8f5825f330b0	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
RodColeman	0:8f5825f330b0	946	{
RodColeman	0:8f5825f330b0	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
RodColeman	0:8f5825f330b0	948	err_t result = ERR_MEM;
RodColeman	0:8f5825f330b0	949	s8_t i; /* ARP entry index */
RodColeman	0:8f5825f330b0	950
RodColeman	0:8f5825f330b0	951	/* non-unicast address? */
RodColeman	0:8f5825f330b0	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
RodColeman	0:8f5825f330b0	953	ip_addr_ismulticast(ipaddr) \|\|
RodColeman	0:8f5825f330b0	954	ip_addr_isany(ipaddr)) {
RodColeman	0:8f5825f330b0	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
RodColeman	0:8f5825f330b0	956	return ERR_ARG;
RodColeman	0:8f5825f330b0	957	}
RodColeman	0:8f5825f330b0	958
RodColeman	0:8f5825f330b0	959	/* find entry in ARP cache, ask to create entry if queueing packet */
RodColeman	0:8f5825f330b0	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
RodColeman	0:8f5825f330b0	961
RodColeman	0:8f5825f330b0	962	/* could not find or create entry? */
RodColeman	0:8f5825f330b0	963	if (i < 0) {
RodColeman	0:8f5825f330b0	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
RodColeman	0:8f5825f330b0	965	if (q) {
RodColeman	0:8f5825f330b0	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
RodColeman	0:8f5825f330b0	967	ETHARP_STATS_INC(etharp.memerr);
RodColeman	0:8f5825f330b0	968	}
RodColeman	0:8f5825f330b0	969	return (err_t)i;
RodColeman	0:8f5825f330b0	970	}
RodColeman	0:8f5825f330b0	971
RodColeman	0:8f5825f330b0	972	/* mark a fresh entry as pending (we just sent a request) */
RodColeman	0:8f5825f330b0	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
RodColeman	0:8f5825f330b0	974	arp_table[i].state = ETHARP_STATE_PENDING;
RodColeman	0:8f5825f330b0	975	}
RodColeman	0:8f5825f330b0	976
RodColeman	0:8f5825f330b0	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
RodColeman	0:8f5825f330b0	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
RodColeman	0:8f5825f330b0	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
RodColeman	0:8f5825f330b0	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
RodColeman	0:8f5825f330b0	981
RodColeman	0:8f5825f330b0	982	/* do we have a pending entry? or an implicit query request? */
RodColeman	0:8f5825f330b0	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
RodColeman	0:8f5825f330b0	984	/* try to resolve it; send out ARP request */
RodColeman	0:8f5825f330b0	985	result = etharp_request(netif, ipaddr);
RodColeman	0:8f5825f330b0	986	if (result != ERR_OK) {
RodColeman	0:8f5825f330b0	987	/* ARP request couldn't be sent */
RodColeman	0:8f5825f330b0	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
RodColeman	0:8f5825f330b0	989	since this failure could be temporary, and the next packet calling
RodColeman	0:8f5825f330b0	990	etharp_query again could lead to sending the queued packets. */
RodColeman	0:8f5825f330b0	991	}
RodColeman	0:8f5825f330b0	992	if (q == NULL) {
RodColeman	0:8f5825f330b0	993	return result;
RodColeman	0:8f5825f330b0	994	}
RodColeman	0:8f5825f330b0	995	}
RodColeman	0:8f5825f330b0	996
RodColeman	0:8f5825f330b0	997	/* packet given? */
RodColeman	0:8f5825f330b0	998	LWIP_ASSERT("q != NULL", q != NULL);
RodColeman	0:8f5825f330b0	999	/* stable entry? */
RodColeman	0:8f5825f330b0	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
RodColeman	0:8f5825f330b0	1001	/* we have a valid IP->Ethernet address mapping */
RodColeman	0:8f5825f330b0	1002	ETHARP_SET_HINT(netif, i);
RodColeman	0:8f5825f330b0	1003	/* send the packet */
RodColeman	0:8f5825f330b0	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
RodColeman	0:8f5825f330b0	1005	/* pending entry? (either just created or already pending */
RodColeman	0:8f5825f330b0	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
RodColeman	0:8f5825f330b0	1007	#if ARP_QUEUEING /* queue the given q packet */
RodColeman	0:8f5825f330b0	1008	struct pbuf *p;
RodColeman	0:8f5825f330b0	1009	int copy_needed = 0;
RodColeman	0:8f5825f330b0	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
RodColeman	0:8f5825f330b0	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
RodColeman	0:8f5825f330b0	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
RodColeman	0:8f5825f330b0	1013	p = q;
RodColeman	0:8f5825f330b0	1014	while (p) {
RodColeman	0:8f5825f330b0	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
RodColeman	0:8f5825f330b0	1016	if(p->type != PBUF_ROM) {
RodColeman	0:8f5825f330b0	1017	copy_needed = 1;
RodColeman	0:8f5825f330b0	1018	break;
RodColeman	0:8f5825f330b0	1019	}
RodColeman	0:8f5825f330b0	1020	p = p->next;
RodColeman	0:8f5825f330b0	1021	}
RodColeman	0:8f5825f330b0	1022	if(copy_needed) {
RodColeman	0:8f5825f330b0	1023	/* copy the whole packet into new pbufs */
RodColeman	0:8f5825f330b0	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
RodColeman	0:8f5825f330b0	1025	if(p != NULL) {
RodColeman	0:8f5825f330b0	1026	if (pbuf_copy(p, q) != ERR_OK) {
RodColeman	0:8f5825f330b0	1027	pbuf_free(p);
RodColeman	0:8f5825f330b0	1028	p = NULL;
RodColeman	0:8f5825f330b0	1029	}
RodColeman	0:8f5825f330b0	1030	}
RodColeman	0:8f5825f330b0	1031	} else {
RodColeman	0:8f5825f330b0	1032	/* referencing the old pbuf is enough */
RodColeman	0:8f5825f330b0	1033	p = q;
RodColeman	0:8f5825f330b0	1034	pbuf_ref(p);
RodColeman	0:8f5825f330b0	1035	}
RodColeman	0:8f5825f330b0	1036	/* packet could be taken over? */
RodColeman	0:8f5825f330b0	1037	if (p != NULL) {
RodColeman	0:8f5825f330b0	1038	/* queue packet ... */
RodColeman	0:8f5825f330b0	1039	struct etharp_q_entry *new_entry;
RodColeman	0:8f5825f330b0	1040	/* allocate a new arp queue entry */
RodColeman	0:8f5825f330b0	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
RodColeman	0:8f5825f330b0	1042	if (new_entry != NULL) {
RodColeman	0:8f5825f330b0	1043	new_entry->next = 0;
RodColeman	0:8f5825f330b0	1044	new_entry->p = p;
RodColeman	0:8f5825f330b0	1045	if(arp_table[i].q != NULL) {
RodColeman	0:8f5825f330b0	1046	/* queue was already existent, append the new entry to the end */
RodColeman	0:8f5825f330b0	1047	struct etharp_q_entry *r;
RodColeman	0:8f5825f330b0	1048	r = arp_table[i].q;
RodColeman	0:8f5825f330b0	1049	while (r->next != NULL) {
RodColeman	0:8f5825f330b0	1050	r = r->next;
RodColeman	0:8f5825f330b0	1051	}
RodColeman	0:8f5825f330b0	1052	r->next = new_entry;
RodColeman	0:8f5825f330b0	1053	} else {
RodColeman	0:8f5825f330b0	1054	/* queue did not exist, first item in queue */
RodColeman	0:8f5825f330b0	1055	arp_table[i].q = new_entry;
RodColeman	0:8f5825f330b0	1056	}
RodColeman	0:8f5825f330b0	1057	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
RodColeman	0:8f5825f330b0	1058	result = ERR_OK;
RodColeman	0:8f5825f330b0	1059	} else {
RodColeman	0:8f5825f330b0	1060	/* the pool MEMP_ARP_QUEUE is empty */
RodColeman	0:8f5825f330b0	1061	pbuf_free(p);
RodColeman	0:8f5825f330b0	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));
RodColeman	0:8f5825f330b0	1063	/* { result == ERR_MEM } through initialization */
RodColeman	0:8f5825f330b0	1064	}
RodColeman	0:8f5825f330b0	1065	} else {
RodColeman	0:8f5825f330b0	1066	ETHARP_STATS_INC(etharp.memerr);
RodColeman	0:8f5825f330b0	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));
RodColeman	0:8f5825f330b0	1068	/* { result == ERR_MEM } through initialization */
RodColeman	0:8f5825f330b0	1069	}
RodColeman	0:8f5825f330b0	1070	#else /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
RodColeman	0:8f5825f330b0	1072	/* { result == ERR_MEM } through initialization */
RodColeman	0:8f5825f330b0	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
RodColeman	0:8f5825f330b0	1074	#endif /* ARP_QUEUEING */
RodColeman	0:8f5825f330b0	1075	}
RodColeman	0:8f5825f330b0	1076	return result;
RodColeman	0:8f5825f330b0	1077	}
RodColeman	0:8f5825f330b0	1078
RodColeman	0:8f5825f330b0	1079	/**
RodColeman	0:8f5825f330b0	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
RodColeman	0:8f5825f330b0	1081	*
RodColeman	0:8f5825f330b0	1082	* @param netif the lwip network interface on which to send the ARP packet
RodColeman	0:8f5825f330b0	1083	* @param ethsrc_addr the source MAC address for the ethernet header
RodColeman	0:8f5825f330b0	1084	* @param ethdst_addr the destination MAC address for the ethernet header
RodColeman	0:8f5825f330b0	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
RodColeman	0:8f5825f330b0	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
RodColeman	0:8f5825f330b0	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
RodColeman	0:8f5825f330b0	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
RodColeman	0:8f5825f330b0	1089	* @param opcode the type of the ARP packet
RodColeman	0:8f5825f330b0	1090	* @return ERR_OK if the ARP packet has been sent
RodColeman	0:8f5825f330b0	1091	* ERR_MEM if the ARP packet couldn't be allocated
RodColeman	0:8f5825f330b0	1092	* any other err_t on failure
RodColeman	0:8f5825f330b0	1093	*/
RodColeman	0:8f5825f330b0	1094	#if !LWIP_AUTOIP
RodColeman	0:8f5825f330b0	1095	static
RodColeman	0:8f5825f330b0	1096	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	1097	err_t
RodColeman	0:8f5825f330b0	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
RodColeman	0:8f5825f330b0	1099	const struct eth_addr *ethdst_addr,
RodColeman	0:8f5825f330b0	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
RodColeman	0:8f5825f330b0	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
RodColeman	0:8f5825f330b0	1102	const u16_t opcode)
RodColeman	0:8f5825f330b0	1103	{
RodColeman	0:8f5825f330b0	1104	struct pbuf *p;
RodColeman	0:8f5825f330b0	1105	err_t result = ERR_OK;
RodColeman	0:8f5825f330b0	1106	struct eth_hdr *ethhdr;
RodColeman	0:8f5825f330b0	1107	struct etharp_hdr *hdr;
RodColeman	0:8f5825f330b0	1108	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	1109	const u8_t * ethdst_hwaddr;
RodColeman	0:8f5825f330b0	1110	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	1111
RodColeman	0:8f5825f330b0	1112	/* allocate a pbuf for the outgoing ARP request packet */
RodColeman	0:8f5825f330b0	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
RodColeman	0:8f5825f330b0	1114	/* could allocate a pbuf for an ARP request? */
RodColeman	0:8f5825f330b0	1115	if (p == NULL) {
RodColeman	0:8f5825f330b0	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
RodColeman	0:8f5825f330b0	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
RodColeman	0:8f5825f330b0	1118	ETHARP_STATS_INC(etharp.memerr);
RodColeman	0:8f5825f330b0	1119	return ERR_MEM;
RodColeman	0:8f5825f330b0	1120	}
RodColeman	0:8f5825f330b0	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
RodColeman	0:8f5825f330b0	1122	(p->len >= SIZEOF_ETHARP_PACKET));
RodColeman	0:8f5825f330b0	1123
RodColeman	0:8f5825f330b0	1124	ethhdr = (struct eth_hdr *)p->payload;
RodColeman	0:8f5825f330b0	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
RodColeman	0:8f5825f330b0	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
RodColeman	0:8f5825f330b0	1127	hdr->opcode = htons(opcode);
RodColeman	0:8f5825f330b0	1128
RodColeman	0:8f5825f330b0	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
RodColeman	0:8f5825f330b0	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
RodColeman	0:8f5825f330b0	1131	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
RodColeman	0:8f5825f330b0	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
RodColeman	0:8f5825f330b0	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
RodColeman	0:8f5825f330b0	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
RodColeman	0:8f5825f330b0	1136	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	1137	/* Write the ARP MAC-Addresses */
RodColeman	0:8f5825f330b0	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
RodColeman	0:8f5825f330b0	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
RodColeman	0:8f5825f330b0	1140	/* Write the Ethernet MAC-Addresses */
RodColeman	0:8f5825f330b0	1141	#if LWIP_AUTOIP
RodColeman	0:8f5825f330b0	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
RodColeman	0:8f5825f330b0	1143	#else /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
RodColeman	0:8f5825f330b0	1145	#endif /* LWIP_AUTOIP */
RodColeman	0:8f5825f330b0	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
RodColeman	0:8f5825f330b0	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
RodColeman	0:8f5825f330b0	1148	* structure packing. */
RodColeman	0:8f5825f330b0	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
RodColeman	0:8f5825f330b0	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
RodColeman	0:8f5825f330b0	1151
RodColeman	0:8f5825f330b0	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
RodColeman	0:8f5825f330b0	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
RodColeman	0:8f5825f330b0	1154	/* set hwlen and protolen */
RodColeman	0:8f5825f330b0	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
RodColeman	0:8f5825f330b0	1156	hdr->protolen = sizeof(ip_addr_t);
RodColeman	0:8f5825f330b0	1157
RodColeman	0:8f5825f330b0	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
RodColeman	0:8f5825f330b0	1159	/* send ARP query */
RodColeman	0:8f5825f330b0	1160	result = netif->linkoutput(netif, p);
RodColeman	0:8f5825f330b0	1161	ETHARP_STATS_INC(etharp.xmit);
RodColeman	0:8f5825f330b0	1162	/* free ARP query packet */
RodColeman	0:8f5825f330b0	1163	pbuf_free(p);
RodColeman	0:8f5825f330b0	1164	p = NULL;
RodColeman	0:8f5825f330b0	1165	/* could not allocate pbuf for ARP request */
RodColeman	0:8f5825f330b0	1166
RodColeman	0:8f5825f330b0	1167	return result;
RodColeman	0:8f5825f330b0	1168	}
RodColeman	0:8f5825f330b0	1169
RodColeman	0:8f5825f330b0	1170	/**
RodColeman	0:8f5825f330b0	1171	* Send an ARP request packet asking for ipaddr.
RodColeman	0:8f5825f330b0	1172	*
RodColeman	0:8f5825f330b0	1173	* @param netif the lwip network interface on which to send the request
RodColeman	0:8f5825f330b0	1174	* @param ipaddr the IP address for which to ask
RodColeman	0:8f5825f330b0	1175	* @return ERR_OK if the request has been sent
RodColeman	0:8f5825f330b0	1176	* ERR_MEM if the ARP packet couldn't be allocated
RodColeman	0:8f5825f330b0	1177	* any other err_t on failure
RodColeman	0:8f5825f330b0	1178	*/
RodColeman	0:8f5825f330b0	1179	err_t
RodColeman	0:8f5825f330b0	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
RodColeman	0:8f5825f330b0	1181	{
RodColeman	0:8f5825f330b0	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
RodColeman	0:8f5825f330b0	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
RodColeman	0:8f5825f330b0	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
RodColeman	0:8f5825f330b0	1185	ipaddr, ARP_REQUEST);
RodColeman	0:8f5825f330b0	1186	}
RodColeman	0:8f5825f330b0	1187	#endif /* LWIP_ARP */
RodColeman	0:8f5825f330b0	1188
RodColeman	0:8f5825f330b0	1189	/**
RodColeman	0:8f5825f330b0	1190	* Process received ethernet frames. Using this function instead of directly
RodColeman	0:8f5825f330b0	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
RodColeman	0:8f5825f330b0	1192	* the ARP cache is protected from concurrent access.
RodColeman	0:8f5825f330b0	1193	*
RodColeman	0:8f5825f330b0	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
RodColeman	0:8f5825f330b0	1195	* @param netif the network interface on which the packet was received
RodColeman	0:8f5825f330b0	1196	*/
RodColeman	0:8f5825f330b0	1197	err_t
RodColeman	0:8f5825f330b0	1198	ethernet_input(struct pbuf p, struct netif netif)
RodColeman	0:8f5825f330b0	1199	{
RodColeman	0:8f5825f330b0	1200	struct eth_hdr* ethhdr;
RodColeman	0:8f5825f330b0	1201	u16_t type;
RodColeman	0:8f5825f330b0	1202
RodColeman	0:8f5825f330b0	1203	/* points to packet payload, which starts with an Ethernet header */
RodColeman	0:8f5825f330b0	1204	ethhdr = (struct eth_hdr *)p->payload;
RodColeman	0:8f5825f330b0	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
RodColeman	0:8f5825f330b0	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",
RodColeman	0:8f5825f330b0	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
RodColeman	0:8f5825f330b0	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
RodColeman	0:8f5825f330b0	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
RodColeman	0:8f5825f330b0	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
RodColeman	0:8f5825f330b0	1211	(unsigned)htons(ethhdr->type)));
RodColeman	0:8f5825f330b0	1212
RodColeman	0:8f5825f330b0	1213	type = ethhdr->type;
RodColeman	0:8f5825f330b0	1214	#if ETHARP_SUPPORT_VLAN
RodColeman	0:8f5825f330b0	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
RodColeman	0:8f5825f330b0	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
RodColeman	0:8f5825f330b0	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
RodColeman	0:8f5825f330b0	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
RodColeman	0:8f5825f330b0	1219	/* silently ignore this packet: not for our VLAN */
RodColeman	0:8f5825f330b0	1220	pbuf_free(p);
RodColeman	0:8f5825f330b0	1221	return ERR_OK;
RodColeman	0:8f5825f330b0	1222	}
RodColeman	0:8f5825f330b0	1223	#endif /* ETHARP_VLAN_CHECK */
RodColeman	0:8f5825f330b0	1224	type = vlan->tpid;
RodColeman	0:8f5825f330b0	1225	}
RodColeman	0:8f5825f330b0	1226	#endif /* ETHARP_SUPPORT_VLAN */
RodColeman	0:8f5825f330b0	1227
RodColeman	0:8f5825f330b0	1228	#if LWIP_ARP_FILTER_NETIF
RodColeman	0:8f5825f330b0	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
RodColeman	0:8f5825f330b0	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
RodColeman	0:8f5825f330b0	1231
RodColeman	0:8f5825f330b0	1232	switch (type) {
RodColeman	0:8f5825f330b0	1233	#if LWIP_ARP
RodColeman	0:8f5825f330b0	1234	/* IP packet? */
RodColeman	0:8f5825f330b0	1235	case PP_HTONS(ETHTYPE_IP):
RodColeman	0:8f5825f330b0	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
RodColeman	0:8f5825f330b0	1237	goto free_and_return;
RodColeman	0:8f5825f330b0	1238	}
RodColeman	0:8f5825f330b0	1239	#if ETHARP_TRUST_IP_MAC
RodColeman	0:8f5825f330b0	1240	/* update ARP table */
RodColeman	0:8f5825f330b0	1241	etharp_ip_input(netif, p);
RodColeman	0:8f5825f330b0	1242	#endif /* ETHARP_TRUST_IP_MAC */
RodColeman	0:8f5825f330b0	1243	/* skip Ethernet header */
RodColeman	0:8f5825f330b0	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
RodColeman	0:8f5825f330b0	1245	LWIP_ASSERT("Can't move over header in packet", 0);
RodColeman	0:8f5825f330b0	1246	goto free_and_return;
RodColeman	0:8f5825f330b0	1247	} else {
RodColeman	0:8f5825f330b0	1248	/* pass to IP layer */
RodColeman	0:8f5825f330b0	1249	ip_input(p, netif);
RodColeman	0:8f5825f330b0	1250	}
RodColeman	0:8f5825f330b0	1251	break;
RodColeman	0:8f5825f330b0	1252
RodColeman	0:8f5825f330b0	1253	case PP_HTONS(ETHTYPE_ARP):
RodColeman	0:8f5825f330b0	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
RodColeman	0:8f5825f330b0	1255	goto free_and_return;
RodColeman	0:8f5825f330b0	1256	}
RodColeman	0:8f5825f330b0	1257	/* pass p to ARP module */
RodColeman	0:8f5825f330b0	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
RodColeman	0:8f5825f330b0	1259	break;
RodColeman	0:8f5825f330b0	1260	#endif /* LWIP_ARP */
RodColeman	0:8f5825f330b0	1261	#if PPPOE_SUPPORT
RodColeman	0:8f5825f330b0	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
RodColeman	0:8f5825f330b0	1263	pppoe_disc_input(netif, p);
RodColeman	0:8f5825f330b0	1264	break;
RodColeman	0:8f5825f330b0	1265
RodColeman	0:8f5825f330b0	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
RodColeman	0:8f5825f330b0	1267	pppoe_data_input(netif, p);
RodColeman	0:8f5825f330b0	1268	break;
RodColeman	0:8f5825f330b0	1269	#endif /* PPPOE_SUPPORT */
RodColeman	0:8f5825f330b0	1270
RodColeman	0:8f5825f330b0	1271	default:
RodColeman	0:8f5825f330b0	1272	ETHARP_STATS_INC(etharp.proterr);
RodColeman	0:8f5825f330b0	1273	ETHARP_STATS_INC(etharp.drop);
RodColeman	0:8f5825f330b0	1274	goto free_and_return;
RodColeman	0:8f5825f330b0	1275	}
RodColeman	0:8f5825f330b0	1276
RodColeman	0:8f5825f330b0	1277	/* This means the pbuf is freed or consumed,
RodColeman	0:8f5825f330b0	1278	so the caller doesn't have to free it again */
RodColeman	0:8f5825f330b0	1279	return ERR_OK;
RodColeman	0:8f5825f330b0	1280
RodColeman	0:8f5825f330b0	1281	free_and_return:
RodColeman	0:8f5825f330b0	1282	pbuf_free(p);
RodColeman	0:8f5825f330b0	1283	return ERR_OK;
RodColeman	0:8f5825f330b0	1284	}
RodColeman	0:8f5825f330b0	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Library
Created:	08 Sep 2011
Imports:	123
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	2

lwip/netif/etharp.c@0:8f5825f330b0, 2011-09-08 (annotated)

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