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Jesper Taxbøl / Mbed 2 deprecated TCPSpeedTest

I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/netif/etharp.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* Address Resolution Protocol module for IP over Ethernet
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	* Functionally, ARP is divided into two parts. The first maps an IP address
tax	0:66300c77c6e9	6	* to a physical address when sending a packet, and the second part answers
tax	0:66300c77c6e9	7	* requests from other machines for our physical address.
tax	0:66300c77c6e9	8	*
tax	0:66300c77c6e9	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
tax	0:66300c77c6e9	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
tax	0:66300c77c6e9	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
tax	0:66300c77c6e9	12	*/
tax	0:66300c77c6e9	13
tax	0:66300c77c6e9	14	/*
tax	0:66300c77c6e9	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
tax	0:66300c77c6e9	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
tax	0:66300c77c6e9	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
tax	0:66300c77c6e9	18	* All rights reserved.
tax	0:66300c77c6e9	19	*
tax	0:66300c77c6e9	20	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	21	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	22	*
tax	0:66300c77c6e9	23	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	24	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	26	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	27	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	28	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	29	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	30	*
tax	0:66300c77c6e9	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	40	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	41	*
tax	0:66300c77c6e9	42	* This file is part of the lwIP TCP/IP stack.
tax	0:66300c77c6e9	43	*
tax	0:66300c77c6e9	44	*/
tax	0:66300c77c6e9	45
tax	0:66300c77c6e9	46	#include "lwip/opt.h"
tax	0:66300c77c6e9	47
tax	0:66300c77c6e9	48	#if LWIP_ARP \|\| LWIP_ETHERNET
tax	0:66300c77c6e9	49
tax	0:66300c77c6e9	50	#include "lwip/ip_addr.h"
tax	0:66300c77c6e9	51	#include "lwip/def.h"
tax	0:66300c77c6e9	52	#include "lwip/ip.h"
tax	0:66300c77c6e9	53	#include "lwip/stats.h"
tax	0:66300c77c6e9	54	#include "lwip/snmp.h"
tax	0:66300c77c6e9	55	#include "lwip/dhcp.h"
tax	0:66300c77c6e9	56	#include "lwip/autoip.h"
tax	0:66300c77c6e9	57	#include "netif/etharp.h"
tax	0:66300c77c6e9	58
tax	0:66300c77c6e9	59	#if PPPOE_SUPPORT
tax	0:66300c77c6e9	60	#include "netif/ppp_oe.h"
tax	0:66300c77c6e9	61	#endif /* PPPOE_SUPPORT */
tax	0:66300c77c6e9	62
tax	0:66300c77c6e9	63	#include <string.h>
tax	0:66300c77c6e9	64
tax	0:66300c77c6e9	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
tax	0:66300c77c6e9	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
tax	0:66300c77c6e9	67
tax	0:66300c77c6e9	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
tax	0:66300c77c6e9	69
tax	0:66300c77c6e9	70	/** the time an ARP entry stays valid after its last update,
tax	0:66300c77c6e9	71	* for ARP_TMR_INTERVAL = 5000, this is
tax	0:66300c77c6e9	72	* (240 * 5) seconds = 20 minutes.
tax	0:66300c77c6e9	73	*/
tax	0:66300c77c6e9	74	#define ARP_MAXAGE 240
tax	0:66300c77c6e9	75	/** the time an ARP entry stays pending after first request,
tax	0:66300c77c6e9	76	* for ARP_TMR_INTERVAL = 5000, this is
tax	0:66300c77c6e9	77	* (2 * 5) seconds = 10 seconds.
tax	0:66300c77c6e9	78	*
tax	0:66300c77c6e9	79	* @internal Keep this number at least 2, otherwise it might
tax	0:66300c77c6e9	80	* run out instantly if the timeout occurs directly after a request.
tax	0:66300c77c6e9	81	*/
tax	0:66300c77c6e9	82	#define ARP_MAXPENDING 2
tax	0:66300c77c6e9	83
tax	0:66300c77c6e9	84	#define HWTYPE_ETHERNET 1
tax	0:66300c77c6e9	85
tax	0:66300c77c6e9	86	enum etharp_state {
tax	0:66300c77c6e9	87	ETHARP_STATE_EMPTY = 0,
tax	0:66300c77c6e9	88	ETHARP_STATE_PENDING,
tax	0:66300c77c6e9	89	ETHARP_STATE_STABLE
tax	0:66300c77c6e9	90	};
tax	0:66300c77c6e9	91
tax	0:66300c77c6e9	92	struct etharp_entry {
tax	0:66300c77c6e9	93	#if ARP_QUEUEING
tax	0:66300c77c6e9	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
tax	0:66300c77c6e9	95	struct etharp_q_entry *q;
tax	0:66300c77c6e9	96	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	97	ip_addr_t ipaddr;
tax	0:66300c77c6e9	98	struct eth_addr ethaddr;
tax	0:66300c77c6e9	99	#if LWIP_SNMP
tax	0:66300c77c6e9	100	struct netif *netif;
tax	0:66300c77c6e9	101	#endif /* LWIP_SNMP */
tax	0:66300c77c6e9	102	u8_t state;
tax	0:66300c77c6e9	103	u8_t ctime;
tax	0:66300c77c6e9	104	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	105	u8_t static_entry;
tax	0:66300c77c6e9	106	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	107	};
tax	0:66300c77c6e9	108
tax	0:66300c77c6e9	109	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
tax	0:66300c77c6e9	110
tax	0:66300c77c6e9	111	#if !LWIP_NETIF_HWADDRHINT
tax	0:66300c77c6e9	112	static u8_t etharp_cached_entry;
tax	0:66300c77c6e9	113	#endif /* !LWIP_NETIF_HWADDRHINT */
tax	0:66300c77c6e9	114
tax	0:66300c77c6e9	115	/** Try hard to create a new entry - we want the IP address to appear in
tax	0:66300c77c6e9	116	the cache (even if this means removing an active entry or so). */
tax	0:66300c77c6e9	117	#define ETHARP_FLAG_TRY_HARD 1
tax	0:66300c77c6e9	118	#define ETHARP_FLAG_FIND_ONLY 2
tax	0:66300c77c6e9	119	#define ETHARP_FLAG_STATIC_ENTRY 4
tax	0:66300c77c6e9	120
tax	0:66300c77c6e9	121	#if LWIP_NETIF_HWADDRHINT
tax	0:66300c77c6e9	122	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
tax	0:66300c77c6e9	123	*((netif)->addr_hint) = (hint);
tax	0:66300c77c6e9	124	#else /* LWIP_NETIF_HWADDRHINT */
tax	0:66300c77c6e9	125	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
tax	0:66300c77c6e9	126	#endif /* LWIP_NETIF_HWADDRHINT */
tax	0:66300c77c6e9	127
tax	0:66300c77c6e9	128	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
tax	0:66300c77c6e9	129
tax	0:66300c77c6e9	130
tax	0:66300c77c6e9	131	/* Some checks, instead of etharp_init(): */
tax	0:66300c77c6e9	132	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
tax	0:66300c77c6e9	133	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
tax	0:66300c77c6e9	134	#endif
tax	0:66300c77c6e9	135
tax	0:66300c77c6e9	136
tax	0:66300c77c6e9	137	#if ARP_QUEUEING
tax	0:66300c77c6e9	138	/**
tax	0:66300c77c6e9	139	* Free a complete queue of etharp entries
tax	0:66300c77c6e9	140	*
tax	0:66300c77c6e9	141	* @param q a qeueue of etharp_q_entry's to free
tax	0:66300c77c6e9	142	*/
tax	0:66300c77c6e9	143	static void
tax	0:66300c77c6e9	144	free_etharp_q(struct etharp_q_entry *q)
tax	0:66300c77c6e9	145	{
tax	0:66300c77c6e9	146	struct etharp_q_entry *r;
tax	0:66300c77c6e9	147	LWIP_ASSERT("q != NULL", q != NULL);
tax	0:66300c77c6e9	148	LWIP_ASSERT("q->p != NULL", q->p != NULL);
tax	0:66300c77c6e9	149	while (q) {
tax	0:66300c77c6e9	150	r = q;
tax	0:66300c77c6e9	151	q = q->next;
tax	0:66300c77c6e9	152	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
tax	0:66300c77c6e9	153	pbuf_free(r->p);
tax	0:66300c77c6e9	154	memp_free(MEMP_ARP_QUEUE, r);
tax	0:66300c77c6e9	155	}
tax	0:66300c77c6e9	156	}
tax	0:66300c77c6e9	157	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	158
tax	0:66300c77c6e9	159	/** Clean up ARP table entries */
tax	0:66300c77c6e9	160	static void
tax	0:66300c77c6e9	161	free_entry(int i)
tax	0:66300c77c6e9	162	{
tax	0:66300c77c6e9	163	/* remove from SNMP ARP index tree */
tax	0:66300c77c6e9	164	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
tax	0:66300c77c6e9	165	#if ARP_QUEUEING
tax	0:66300c77c6e9	166	/* and empty packet queue */
tax	0:66300c77c6e9	167	if (arp_table[i].q != NULL) {
tax	0:66300c77c6e9	168	/* remove all queued packets */
tax	0:66300c77c6e9	169	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
tax	0:66300c77c6e9	170	free_etharp_q(arp_table[i].q);
tax	0:66300c77c6e9	171	arp_table[i].q = NULL;
tax	0:66300c77c6e9	172	}
tax	0:66300c77c6e9	173	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	174	/* recycle entry for re-use */
tax	0:66300c77c6e9	175	arp_table[i].state = ETHARP_STATE_EMPTY;
tax	0:66300c77c6e9	176	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	177	arp_table[i].static_entry = 0;
tax	0:66300c77c6e9	178	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	179	#ifdef LWIP_DEBUG
tax	0:66300c77c6e9	180	/* for debugging, clean out the complete entry */
tax	0:66300c77c6e9	181	arp_table[i].ctime = 0;
tax	0:66300c77c6e9	182	#if LWIP_SNMP
tax	0:66300c77c6e9	183	arp_table[i].netif = NULL;
tax	0:66300c77c6e9	184	#endif /* LWIP_SNMP */
tax	0:66300c77c6e9	185	ip_addr_set_zero(&arp_table[i].ipaddr);
tax	0:66300c77c6e9	186	arp_table[i].ethaddr = ethzero;
tax	0:66300c77c6e9	187	#endif /* LWIP_DEBUG */
tax	0:66300c77c6e9	188	}
tax	0:66300c77c6e9	189
tax	0:66300c77c6e9	190	/**
tax	0:66300c77c6e9	191	* Clears expired entries in the ARP table.
tax	0:66300c77c6e9	192	*
tax	0:66300c77c6e9	193	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
tax	0:66300c77c6e9	194	* in order to expire entries in the ARP table.
tax	0:66300c77c6e9	195	*/
tax	0:66300c77c6e9	196	void
tax	0:66300c77c6e9	197	etharp_tmr(void)
tax	0:66300c77c6e9	198	{
tax	0:66300c77c6e9	199	u8_t i;
tax	0:66300c77c6e9	200
tax	0:66300c77c6e9	201	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
tax	0:66300c77c6e9	202	/* remove expired entries from the ARP table */
tax	0:66300c77c6e9	203	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
tax	0:66300c77c6e9	204	u8_t state = arp_table[i].state;
tax	0:66300c77c6e9	205	if (state != ETHARP_STATE_EMPTY
tax	0:66300c77c6e9	206	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	207	&& (arp_table[i].static_entry == 0)
tax	0:66300c77c6e9	208	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	209	) {
tax	0:66300c77c6e9	210	arp_table[i].ctime++;
tax	0:66300c77c6e9	211	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
tax	0:66300c77c6e9	212	((arp_table[i].state == ETHARP_STATE_PENDING) &&
tax	0:66300c77c6e9	213	(arp_table[i].ctime >= ARP_MAXPENDING))) {
tax	0:66300c77c6e9	214	/* pending or stable entry has become old! */
tax	0:66300c77c6e9	215	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
tax	0:66300c77c6e9	216	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
tax	0:66300c77c6e9	217	/* clean up entries that have just been expired */
tax	0:66300c77c6e9	218	free_entry(i);
tax	0:66300c77c6e9	219	}
tax	0:66300c77c6e9	220	#if ARP_QUEUEING
tax	0:66300c77c6e9	221	/* still pending entry? (not expired) */
tax	0:66300c77c6e9	222	if (arp_table[i].state == ETHARP_STATE_PENDING) {
tax	0:66300c77c6e9	223	/* resend an ARP query here? */
tax	0:66300c77c6e9	224	}
tax	0:66300c77c6e9	225	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	226	}
tax	0:66300c77c6e9	227	}
tax	0:66300c77c6e9	228	}
tax	0:66300c77c6e9	229
tax	0:66300c77c6e9	230	/**
tax	0:66300c77c6e9	231	* Search the ARP table for a matching or new entry.
tax	0:66300c77c6e9	232	*
tax	0:66300c77c6e9	233	* If an IP address is given, return a pending or stable ARP entry that matches
tax	0:66300c77c6e9	234	* the address. If no match is found, create a new entry with this address set,
tax	0:66300c77c6e9	235	* but in state ETHARP_EMPTY. The caller must check and possibly change the
tax	0:66300c77c6e9	236	* state of the returned entry.
tax	0:66300c77c6e9	237	*
tax	0:66300c77c6e9	238	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
tax	0:66300c77c6e9	239	*
tax	0:66300c77c6e9	240	* In all cases, attempt to create new entries from an empty entry. If no
tax	0:66300c77c6e9	241	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
tax	0:66300c77c6e9	242	* old entries. Heuristic choose the least important entry for recycling.
tax	0:66300c77c6e9	243	*
tax	0:66300c77c6e9	244	* @param ipaddr IP address to find in ARP cache, or to add if not found.
tax	0:66300c77c6e9	245	* @param flags @see definition of ETHARP_FLAG_*
tax	0:66300c77c6e9	246	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
tax	0:66300c77c6e9	247	*
tax	0:66300c77c6e9	248	* @return The ARP entry index that matched or is created, ERR_MEM if no
tax	0:66300c77c6e9	249	* entry is found or could be recycled.
tax	0:66300c77c6e9	250	*/
tax	0:66300c77c6e9	251	static s8_t
tax	0:66300c77c6e9	252	find_entry(ip_addr_t *ipaddr, u8_t flags)
tax	0:66300c77c6e9	253	{
tax	0:66300c77c6e9	254	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
tax	0:66300c77c6e9	255	s8_t empty = ARP_TABLE_SIZE;
tax	0:66300c77c6e9	256	u8_t i = 0, age_pending = 0, age_stable = 0;
tax	0:66300c77c6e9	257	#if ARP_QUEUEING
tax	0:66300c77c6e9	258	/* oldest entry with packets on queue */
tax	0:66300c77c6e9	259	s8_t old_queue = ARP_TABLE_SIZE;
tax	0:66300c77c6e9	260	/* its age */
tax	0:66300c77c6e9	261	u8_t age_queue = 0;
tax	0:66300c77c6e9	262	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	263
tax	0:66300c77c6e9	264	/**
tax	0:66300c77c6e9	265	* a) do a search through the cache, remember candidates
tax	0:66300c77c6e9	266	* b) select candidate entry
tax	0:66300c77c6e9	267	* c) create new entry
tax	0:66300c77c6e9	268	*/
tax	0:66300c77c6e9	269
tax	0:66300c77c6e9	270	/* a) in a single search sweep, do all of this
tax	0:66300c77c6e9	271	* 1) remember the first empty entry (if any)
tax	0:66300c77c6e9	272	* 2) remember the oldest stable entry (if any)
tax	0:66300c77c6e9	273	* 3) remember the oldest pending entry without queued packets (if any)
tax	0:66300c77c6e9	274	* 4) remember the oldest pending entry with queued packets (if any)
tax	0:66300c77c6e9	275	* 5) search for a matching IP entry, either pending or stable
tax	0:66300c77c6e9	276	* until 5 matches, or all entries are searched for.
tax	0:66300c77c6e9	277	*/
tax	0:66300c77c6e9	278
tax	0:66300c77c6e9	279	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
tax	0:66300c77c6e9	280	u8_t state = arp_table[i].state;
tax	0:66300c77c6e9	281	/* no empty entry found yet and now we do find one? */
tax	0:66300c77c6e9	282	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
tax	0:66300c77c6e9	283	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
tax	0:66300c77c6e9	284	/* remember first empty entry */
tax	0:66300c77c6e9	285	empty = i;
tax	0:66300c77c6e9	286	} else if (state != ETHARP_STATE_EMPTY) {
tax	0:66300c77c6e9	287	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
tax	0:66300c77c6e9	288	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
tax	0:66300c77c6e9	289	/* if given, does IP address match IP address in ARP entry? */
tax	0:66300c77c6e9	290	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
tax	0:66300c77c6e9	291	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
tax	0:66300c77c6e9	292	/* found exact IP address match, simply bail out */
tax	0:66300c77c6e9	293	return i;
tax	0:66300c77c6e9	294	}
tax	0:66300c77c6e9	295	/* pending entry? */
tax	0:66300c77c6e9	296	if (state == ETHARP_STATE_PENDING) {
tax	0:66300c77c6e9	297	/* pending with queued packets? */
tax	0:66300c77c6e9	298	#if ARP_QUEUEING
tax	0:66300c77c6e9	299	if (arp_table[i].q != NULL) {
tax	0:66300c77c6e9	300	if (arp_table[i].ctime >= age_queue) {
tax	0:66300c77c6e9	301	old_queue = i;
tax	0:66300c77c6e9	302	age_queue = arp_table[i].ctime;
tax	0:66300c77c6e9	303	}
tax	0:66300c77c6e9	304	} else
tax	0:66300c77c6e9	305	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	306	/* pending without queued packets? */
tax	0:66300c77c6e9	307	{
tax	0:66300c77c6e9	308	if (arp_table[i].ctime >= age_pending) {
tax	0:66300c77c6e9	309	old_pending = i;
tax	0:66300c77c6e9	310	age_pending = arp_table[i].ctime;
tax	0:66300c77c6e9	311	}
tax	0:66300c77c6e9	312	}
tax	0:66300c77c6e9	313	/* stable entry? */
tax	0:66300c77c6e9	314	} else if (state == ETHARP_STATE_STABLE) {
tax	0:66300c77c6e9	315	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	316	/* don't record old_stable for static entries since they never expire */
tax	0:66300c77c6e9	317	if (arp_table[i].static_entry == 0)
tax	0:66300c77c6e9	318	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	319	{
tax	0:66300c77c6e9	320	/* remember entry with oldest stable entry in oldest, its age in maxtime */
tax	0:66300c77c6e9	321	if (arp_table[i].ctime >= age_stable) {
tax	0:66300c77c6e9	322	old_stable = i;
tax	0:66300c77c6e9	323	age_stable = arp_table[i].ctime;
tax	0:66300c77c6e9	324	}
tax	0:66300c77c6e9	325	}
tax	0:66300c77c6e9	326	}
tax	0:66300c77c6e9	327	}
tax	0:66300c77c6e9	328	}
tax	0:66300c77c6e9	329	/* { we have no match } => try to create a new entry */
tax	0:66300c77c6e9	330
tax	0:66300c77c6e9	331	/* don't create new entry, only search? */
tax	0:66300c77c6e9	332	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
tax	0:66300c77c6e9	333	/* or no empty entry found and not allowed to recycle? */
tax	0:66300c77c6e9	334	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
tax	0:66300c77c6e9	335	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
tax	0:66300c77c6e9	336	return (s8_t)ERR_MEM;
tax	0:66300c77c6e9	337	}
tax	0:66300c77c6e9	338
tax	0:66300c77c6e9	339	/* b) choose the least destructive entry to recycle:
tax	0:66300c77c6e9	340	* 1) empty entry
tax	0:66300c77c6e9	341	* 2) oldest stable entry
tax	0:66300c77c6e9	342	* 3) oldest pending entry without queued packets
tax	0:66300c77c6e9	343	* 4) oldest pending entry with queued packets
tax	0:66300c77c6e9	344	*
tax	0:66300c77c6e9	345	* { ETHARP_FLAG_TRY_HARD is set at this point }
tax	0:66300c77c6e9	346	*/
tax	0:66300c77c6e9	347
tax	0:66300c77c6e9	348	/* 1) empty entry available? */
tax	0:66300c77c6e9	349	if (empty < ARP_TABLE_SIZE) {
tax	0:66300c77c6e9	350	i = empty;
tax	0:66300c77c6e9	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
tax	0:66300c77c6e9	352	} else {
tax	0:66300c77c6e9	353	/* 2) found recyclable stable entry? */
tax	0:66300c77c6e9	354	if (old_stable < ARP_TABLE_SIZE) {
tax	0:66300c77c6e9	355	/* recycle oldest stable*/
tax	0:66300c77c6e9	356	i = old_stable;
tax	0:66300c77c6e9	357	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
tax	0:66300c77c6e9	358	#if ARP_QUEUEING
tax	0:66300c77c6e9	359	/* no queued packets should exist on stable entries */
tax	0:66300c77c6e9	360	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
tax	0:66300c77c6e9	361	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	362	/* 3) found recyclable pending entry without queued packets? */
tax	0:66300c77c6e9	363	} else if (old_pending < ARP_TABLE_SIZE) {
tax	0:66300c77c6e9	364	/* recycle oldest pending */
tax	0:66300c77c6e9	365	i = old_pending;
tax	0:66300c77c6e9	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
tax	0:66300c77c6e9	367	#if ARP_QUEUEING
tax	0:66300c77c6e9	368	/* 4) found recyclable pending entry with queued packets? */
tax	0:66300c77c6e9	369	} else if (old_queue < ARP_TABLE_SIZE) {
tax	0:66300c77c6e9	370	/* recycle oldest pending (queued packets are free in free_entry) */
tax	0:66300c77c6e9	371	i = old_queue;
tax	0:66300c77c6e9	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)));
tax	0:66300c77c6e9	373	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	374	/* no empty or recyclable entries found */
tax	0:66300c77c6e9	375	} else {
tax	0:66300c77c6e9	376	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
tax	0:66300c77c6e9	377	return (s8_t)ERR_MEM;
tax	0:66300c77c6e9	378	}
tax	0:66300c77c6e9	379
tax	0:66300c77c6e9	380	/* { empty or recyclable entry found } */
tax	0:66300c77c6e9	381	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
tax	0:66300c77c6e9	382	free_entry(i);
tax	0:66300c77c6e9	383	}
tax	0:66300c77c6e9	384
tax	0:66300c77c6e9	385	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
tax	0:66300c77c6e9	386	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
tax	0:66300c77c6e9	387	arp_table[i].state == ETHARP_STATE_EMPTY);
tax	0:66300c77c6e9	388
tax	0:66300c77c6e9	389	/* IP address given? */
tax	0:66300c77c6e9	390	if (ipaddr != NULL) {
tax	0:66300c77c6e9	391	/* set IP address */
tax	0:66300c77c6e9	392	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
tax	0:66300c77c6e9	393	}
tax	0:66300c77c6e9	394	arp_table[i].ctime = 0;
tax	0:66300c77c6e9	395	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	396	arp_table[i].static_entry = 0;
tax	0:66300c77c6e9	397	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	398	return (err_t)i;
tax	0:66300c77c6e9	399	}
tax	0:66300c77c6e9	400
tax	0:66300c77c6e9	401	/**
tax	0:66300c77c6e9	402	* Send an IP packet on the network using netif->linkoutput
tax	0:66300c77c6e9	403	* The ethernet header is filled in before sending.
tax	0:66300c77c6e9	404	*
tax	0:66300c77c6e9	405	* @params netif the lwIP network interface on which to send the packet
tax	0:66300c77c6e9	406	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
tax	0:66300c77c6e9	407	* @params src the source MAC address to be copied into the ethernet header
tax	0:66300c77c6e9	408	* @params dst the destination MAC address to be copied into the ethernet header
tax	0:66300c77c6e9	409	* @return ERR_OK if the packet was sent, any other err_t on failure
tax	0:66300c77c6e9	410	*/
tax	0:66300c77c6e9	411	static err_t
tax	0:66300c77c6e9	412	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
tax	0:66300c77c6e9	413	{
tax	0:66300c77c6e9	414	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
tax	0:66300c77c6e9	415
tax	0:66300c77c6e9	416	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
tax	0:66300c77c6e9	417	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
tax	0:66300c77c6e9	418	ETHADDR32_COPY(&ethhdr->dest, dst);
tax	0:66300c77c6e9	419	ETHADDR16_COPY(&ethhdr->src, src);
tax	0:66300c77c6e9	420	ethhdr->type = PP_HTONS(ETHTYPE_IP);
tax	0:66300c77c6e9	421	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
tax	0:66300c77c6e9	422	/* send the packet */
tax	0:66300c77c6e9	423	return netif->linkoutput(netif, p);
tax	0:66300c77c6e9	424	}
tax	0:66300c77c6e9	425
tax	0:66300c77c6e9	426	/**
tax	0:66300c77c6e9	427	* Update (or insert) a IP/MAC address pair in the ARP cache.
tax	0:66300c77c6e9	428	*
tax	0:66300c77c6e9	429	* If a pending entry is resolved, any queued packets will be sent
tax	0:66300c77c6e9	430	* at this point.
tax	0:66300c77c6e9	431	*
tax	0:66300c77c6e9	432	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
tax	0:66300c77c6e9	433	* @param ipaddr IP address of the inserted ARP entry.
tax	0:66300c77c6e9	434	* @param ethaddr Ethernet address of the inserted ARP entry.
tax	0:66300c77c6e9	435	* @param flags @see definition of ETHARP_FLAG_*
tax	0:66300c77c6e9	436	*
tax	0:66300c77c6e9	437	* @return
tax	0:66300c77c6e9	438	* - ERR_OK Succesfully updated ARP cache.
tax	0:66300c77c6e9	439	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
tax	0:66300c77c6e9	440	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
tax	0:66300c77c6e9	441	*
tax	0:66300c77c6e9	442	* @see pbuf_free()
tax	0:66300c77c6e9	443	*/
tax	0:66300c77c6e9	444	static err_t
tax	0:66300c77c6e9	445	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
tax	0:66300c77c6e9	446	{
tax	0:66300c77c6e9	447	s8_t i;
tax	0:66300c77c6e9	448	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
tax	0:66300c77c6e9	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",
tax	0:66300c77c6e9	450	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
tax	0:66300c77c6e9	451	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
tax	0:66300c77c6e9	452	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
tax	0:66300c77c6e9	453	/* non-unicast address? */
tax	0:66300c77c6e9	454	if (ip_addr_isany(ipaddr) \|\|
tax	0:66300c77c6e9	455	ip_addr_isbroadcast(ipaddr, netif) \|\|
tax	0:66300c77c6e9	456	ip_addr_ismulticast(ipaddr)) {
tax	0:66300c77c6e9	457	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
tax	0:66300c77c6e9	458	return ERR_ARG;
tax	0:66300c77c6e9	459	}
tax	0:66300c77c6e9	460	/* find or create ARP entry */
tax	0:66300c77c6e9	461	i = find_entry(ipaddr, flags);
tax	0:66300c77c6e9	462	/* bail out if no entry could be found */
tax	0:66300c77c6e9	463	if (i < 0) {
tax	0:66300c77c6e9	464	return (err_t)i;
tax	0:66300c77c6e9	465	}
tax	0:66300c77c6e9	466
tax	0:66300c77c6e9	467	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	468	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
tax	0:66300c77c6e9	469	/* record static type */
tax	0:66300c77c6e9	470	arp_table[i].static_entry = 1;
tax	0:66300c77c6e9	471	}
tax	0:66300c77c6e9	472	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	473
tax	0:66300c77c6e9	474	/* mark it stable */
tax	0:66300c77c6e9	475	arp_table[i].state = ETHARP_STATE_STABLE;
tax	0:66300c77c6e9	476
tax	0:66300c77c6e9	477	#if LWIP_SNMP
tax	0:66300c77c6e9	478	/* record network interface */
tax	0:66300c77c6e9	479	arp_table[i].netif = netif;
tax	0:66300c77c6e9	480	#endif /* LWIP_SNMP */
tax	0:66300c77c6e9	481	/* insert in SNMP ARP index tree */
tax	0:66300c77c6e9	482	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
tax	0:66300c77c6e9	483
tax	0:66300c77c6e9	484	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
tax	0:66300c77c6e9	485	/* update address */
tax	0:66300c77c6e9	486	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
tax	0:66300c77c6e9	487	/* reset time stamp */
tax	0:66300c77c6e9	488	arp_table[i].ctime = 0;
tax	0:66300c77c6e9	489	#if ARP_QUEUEING
tax	0:66300c77c6e9	490	/* this is where we will send out queued packets! */
tax	0:66300c77c6e9	491	while (arp_table[i].q != NULL) {
tax	0:66300c77c6e9	492	struct pbuf *p;
tax	0:66300c77c6e9	493	/* remember remainder of queue */
tax	0:66300c77c6e9	494	struct etharp_q_entry *q = arp_table[i].q;
tax	0:66300c77c6e9	495	/* pop first item off the queue */
tax	0:66300c77c6e9	496	arp_table[i].q = q->next;
tax	0:66300c77c6e9	497	/* get the packet pointer */
tax	0:66300c77c6e9	498	p = q->p;
tax	0:66300c77c6e9	499	/* now queue entry can be freed */
tax	0:66300c77c6e9	500	memp_free(MEMP_ARP_QUEUE, q);
tax	0:66300c77c6e9	501	/* send the queued IP packet */
tax	0:66300c77c6e9	502	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
tax	0:66300c77c6e9	503	/* free the queued IP packet */
tax	0:66300c77c6e9	504	pbuf_free(p);
tax	0:66300c77c6e9	505	}
tax	0:66300c77c6e9	506	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	507	return ERR_OK;
tax	0:66300c77c6e9	508	}
tax	0:66300c77c6e9	509
tax	0:66300c77c6e9	510	#if ETHARP_SUPPORT_STATIC_ENTRIES
tax	0:66300c77c6e9	511	/** Add a new static entry to the ARP table. If an entry exists for the
tax	0:66300c77c6e9	512	* specified IP address, this entry is overwritten.
tax	0:66300c77c6e9	513	* If packets are queued for the specified IP address, they are sent out.
tax	0:66300c77c6e9	514	*
tax	0:66300c77c6e9	515	* @param ipaddr IP address for the new static entry
tax	0:66300c77c6e9	516	* @param ethaddr ethernet address for the new static entry
tax	0:66300c77c6e9	517	* @return @see return values of etharp_add_static_entry
tax	0:66300c77c6e9	518	*/
tax	0:66300c77c6e9	519	err_t
tax	0:66300c77c6e9	520	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
tax	0:66300c77c6e9	521	{
tax	0:66300c77c6e9	522	struct netif *netif;
tax	0:66300c77c6e9	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",
tax	0:66300c77c6e9	524	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
tax	0:66300c77c6e9	525	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
tax	0:66300c77c6e9	526	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
tax	0:66300c77c6e9	527
tax	0:66300c77c6e9	528	netif = ip_route(ipaddr);
tax	0:66300c77c6e9	529	if (netif == NULL) {
tax	0:66300c77c6e9	530	return ERR_RTE;
tax	0:66300c77c6e9	531	}
tax	0:66300c77c6e9	532
tax	0:66300c77c6e9	533	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
tax	0:66300c77c6e9	534	}
tax	0:66300c77c6e9	535
tax	0:66300c77c6e9	536	/** Remove a static entry from the ARP table previously added with a call to
tax	0:66300c77c6e9	537	* etharp_add_static_entry.
tax	0:66300c77c6e9	538	*
tax	0:66300c77c6e9	539	* @param ipaddr IP address of the static entry to remove
tax	0:66300c77c6e9	540	* @return ERR_OK: entry removed
tax	0:66300c77c6e9	541	* ERR_MEM: entry wasn't found
tax	0:66300c77c6e9	542	* ERR_ARG: entry wasn't a static entry but a dynamic one
tax	0:66300c77c6e9	543	*/
tax	0:66300c77c6e9	544	err_t
tax	0:66300c77c6e9	545	etharp_remove_static_entry(ip_addr_t *ipaddr)
tax	0:66300c77c6e9	546	{
tax	0:66300c77c6e9	547	s8_t i;
tax	0:66300c77c6e9	548	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	549	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
tax	0:66300c77c6e9	550
tax	0:66300c77c6e9	551	/* find or create ARP entry */
tax	0:66300c77c6e9	552	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
tax	0:66300c77c6e9	553	/* bail out if no entry could be found */
tax	0:66300c77c6e9	554	if (i < 0) {
tax	0:66300c77c6e9	555	return (err_t)i;
tax	0:66300c77c6e9	556	}
tax	0:66300c77c6e9	557
tax	0:66300c77c6e9	558	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
tax	0:66300c77c6e9	559	(arp_table[i].static_entry == 0)) {
tax	0:66300c77c6e9	560	/* entry wasn't a static entry, cannot remove it */
tax	0:66300c77c6e9	561	return ERR_ARG;
tax	0:66300c77c6e9	562	}
tax	0:66300c77c6e9	563	/* entry found, free it */
tax	0:66300c77c6e9	564	free_entry(i);
tax	0:66300c77c6e9	565	return ERR_OK;
tax	0:66300c77c6e9	566	}
tax	0:66300c77c6e9	567	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
tax	0:66300c77c6e9	568
tax	0:66300c77c6e9	569	/**
tax	0:66300c77c6e9	570	* Finds (stable) ethernet/IP address pair from ARP table
tax	0:66300c77c6e9	571	* using interface and IP address index.
tax	0:66300c77c6e9	572	* @note the addresses in the ARP table are in network order!
tax	0:66300c77c6e9	573	*
tax	0:66300c77c6e9	574	* @param netif points to interface index
tax	0:66300c77c6e9	575	* @param ipaddr points to the (network order) IP address index
tax	0:66300c77c6e9	576	* @param eth_ret points to return pointer
tax	0:66300c77c6e9	577	* @param ip_ret points to return pointer
tax	0:66300c77c6e9	578	* @return table index if found, -1 otherwise
tax	0:66300c77c6e9	579	*/
tax	0:66300c77c6e9	580	s8_t
tax	0:66300c77c6e9	581	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
tax	0:66300c77c6e9	582	struct eth_addr eth_ret, ip_addr_t ip_ret)
tax	0:66300c77c6e9	583	{
tax	0:66300c77c6e9	584	s8_t i;
tax	0:66300c77c6e9	585
tax	0:66300c77c6e9	586	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
tax	0:66300c77c6e9	587	eth_ret != NULL && ip_ret != NULL);
tax	0:66300c77c6e9	588
tax	0:66300c77c6e9	589	LWIP_UNUSED_ARG(netif);
tax	0:66300c77c6e9	590
tax	0:66300c77c6e9	591	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
tax	0:66300c77c6e9	592	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
tax	0:66300c77c6e9	593	*eth_ret = &arp_table[i].ethaddr;
tax	0:66300c77c6e9	594	*ip_ret = &arp_table[i].ipaddr;
tax	0:66300c77c6e9	595	return i;
tax	0:66300c77c6e9	596	}
tax	0:66300c77c6e9	597	return -1;
tax	0:66300c77c6e9	598	}
tax	0:66300c77c6e9	599
tax	0:66300c77c6e9	600	#if ETHARP_TRUST_IP_MAC
tax	0:66300c77c6e9	601	/**
tax	0:66300c77c6e9	602	* Updates the ARP table using the given IP packet.
tax	0:66300c77c6e9	603	*
tax	0:66300c77c6e9	604	* Uses the incoming IP packet's source address to update the
tax	0:66300c77c6e9	605	* ARP cache for the local network. The function does not alter
tax	0:66300c77c6e9	606	* or free the packet. This function must be called before the
tax	0:66300c77c6e9	607	* packet p is passed to the IP layer.
tax	0:66300c77c6e9	608	*
tax	0:66300c77c6e9	609	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
tax	0:66300c77c6e9	610	* @param p The IP packet that arrived on netif.
tax	0:66300c77c6e9	611	*
tax	0:66300c77c6e9	612	* @return NULL
tax	0:66300c77c6e9	613	*
tax	0:66300c77c6e9	614	* @see pbuf_free()
tax	0:66300c77c6e9	615	*/
tax	0:66300c77c6e9	616	static void
tax	0:66300c77c6e9	617	etharp_ip_input(struct netif netif, struct pbuf p)
tax	0:66300c77c6e9	618	{
tax	0:66300c77c6e9	619	struct eth_hdr *ethhdr;
tax	0:66300c77c6e9	620	struct ip_hdr *iphdr;
tax	0:66300c77c6e9	621	ip_addr_t iphdr_src;
tax	0:66300c77c6e9	622	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
tax	0:66300c77c6e9	623
tax	0:66300c77c6e9	624	/* Only insert an entry if the source IP address of the
tax	0:66300c77c6e9	625	incoming IP packet comes from a host on the local network. */
tax	0:66300c77c6e9	626	ethhdr = (struct eth_hdr *)p->payload;
tax	0:66300c77c6e9	627	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
tax	0:66300c77c6e9	628	#if ETHARP_SUPPORT_VLAN
tax	0:66300c77c6e9	629	if (ethhdr->type == ETHTYPE_VLAN) {
tax	0:66300c77c6e9	630	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
tax	0:66300c77c6e9	631	}
tax	0:66300c77c6e9	632	#endif /* ETHARP_SUPPORT_VLAN */
tax	0:66300c77c6e9	633
tax	0:66300c77c6e9	634	ip_addr_copy(iphdr_src, iphdr->src);
tax	0:66300c77c6e9	635
tax	0:66300c77c6e9	636	/* source is not on the local network? */
tax	0:66300c77c6e9	637	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
tax	0:66300c77c6e9	638	/* do nothing */
tax	0:66300c77c6e9	639	return;
tax	0:66300c77c6e9	640	}
tax	0:66300c77c6e9	641
tax	0:66300c77c6e9	642	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
tax	0:66300c77c6e9	643	/* update the source IP address in the cache, if present */
tax	0:66300c77c6e9	644	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
tax	0:66300c77c6e9	645	* back soon (for example, if the destination IP address is ours. */
tax	0:66300c77c6e9	646	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
tax	0:66300c77c6e9	647	}
tax	0:66300c77c6e9	648	#endif /* ETHARP_TRUST_IP_MAC */
tax	0:66300c77c6e9	649
tax	0:66300c77c6e9	650	/**
tax	0:66300c77c6e9	651	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
tax	0:66300c77c6e9	652	* send out queued IP packets. Updates cache with snooped address pairs.
tax	0:66300c77c6e9	653	*
tax	0:66300c77c6e9	654	* Should be called for incoming ARP packets. The pbuf in the argument
tax	0:66300c77c6e9	655	* is freed by this function.
tax	0:66300c77c6e9	656	*
tax	0:66300c77c6e9	657	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
tax	0:66300c77c6e9	658	* @param ethaddr Ethernet address of netif.
tax	0:66300c77c6e9	659	* @param p The ARP packet that arrived on netif. Is freed by this function.
tax	0:66300c77c6e9	660	*
tax	0:66300c77c6e9	661	* @return NULL
tax	0:66300c77c6e9	662	*
tax	0:66300c77c6e9	663	* @see pbuf_free()
tax	0:66300c77c6e9	664	*/
tax	0:66300c77c6e9	665	static void
tax	0:66300c77c6e9	666	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
tax	0:66300c77c6e9	667	{
tax	0:66300c77c6e9	668	struct etharp_hdr *hdr;
tax	0:66300c77c6e9	669	struct eth_hdr *ethhdr;
tax	0:66300c77c6e9	670	/* these are aligned properly, whereas the ARP header fields might not be */
tax	0:66300c77c6e9	671	ip_addr_t sipaddr, dipaddr;
tax	0:66300c77c6e9	672	u8_t for_us;
tax	0:66300c77c6e9	673	#if LWIP_AUTOIP
tax	0:66300c77c6e9	674	const u8_t * ethdst_hwaddr;
tax	0:66300c77c6e9	675	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	676
tax	0:66300c77c6e9	677	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
tax	0:66300c77c6e9	678
tax	0:66300c77c6e9	679	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
tax	0:66300c77c6e9	680	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
tax	0:66300c77c6e9	681	if (p->len < SIZEOF_ETHARP_PACKET) {
tax	0:66300c77c6e9	682	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	683	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
tax	0:66300c77c6e9	684	(s16_t)SIZEOF_ETHARP_PACKET));
tax	0:66300c77c6e9	685	ETHARP_STATS_INC(etharp.lenerr);
tax	0:66300c77c6e9	686	ETHARP_STATS_INC(etharp.drop);
tax	0:66300c77c6e9	687	pbuf_free(p);
tax	0:66300c77c6e9	688	return;
tax	0:66300c77c6e9	689	}
tax	0:66300c77c6e9	690
tax	0:66300c77c6e9	691	ethhdr = (struct eth_hdr *)p->payload;
tax	0:66300c77c6e9	692	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
tax	0:66300c77c6e9	693	#if ETHARP_SUPPORT_VLAN
tax	0:66300c77c6e9	694	if (ethhdr->type == ETHTYPE_VLAN) {
tax	0:66300c77c6e9	695	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
tax	0:66300c77c6e9	696	}
tax	0:66300c77c6e9	697	#endif /* ETHARP_SUPPORT_VLAN */
tax	0:66300c77c6e9	698
tax	0:66300c77c6e9	699	/* RFC 826 "Packet Reception": */
tax	0:66300c77c6e9	700	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
tax	0:66300c77c6e9	701	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
tax	0:66300c77c6e9	702	(hdr->protolen != sizeof(ip_addr_t)) \|\|
tax	0:66300c77c6e9	703	(hdr->proto != PP_HTONS(ETHTYPE_IP)) \|\|
tax	0:66300c77c6e9	704	(ethhdr->type != PP_HTONS(ETHTYPE_ARP))) {
tax	0:66300c77c6e9	705	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
tax	0:66300c77c6e9	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",
tax	0:66300c77c6e9	707	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen, ethhdr->type));
tax	0:66300c77c6e9	708	ETHARP_STATS_INC(etharp.proterr);
tax	0:66300c77c6e9	709	ETHARP_STATS_INC(etharp.drop);
tax	0:66300c77c6e9	710	pbuf_free(p);
tax	0:66300c77c6e9	711	return;
tax	0:66300c77c6e9	712	}
tax	0:66300c77c6e9	713	ETHARP_STATS_INC(etharp.recv);
tax	0:66300c77c6e9	714
tax	0:66300c77c6e9	715	#if LWIP_AUTOIP
tax	0:66300c77c6e9	716	/* We have to check if a host already has configured our random
tax	0:66300c77c6e9	717	* created link local address and continously check if there is
tax	0:66300c77c6e9	718	* a host with this IP-address so we can detect collisions */
tax	0:66300c77c6e9	719	autoip_arp_reply(netif, hdr);
tax	0:66300c77c6e9	720	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	721
tax	0:66300c77c6e9	722	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
tax	0:66300c77c6e9	723	* structure packing (not using structure copy which breaks strict-aliasing rules). */
tax	0:66300c77c6e9	724	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
tax	0:66300c77c6e9	725	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
tax	0:66300c77c6e9	726
tax	0:66300c77c6e9	727	/* this interface is not configured? */
tax	0:66300c77c6e9	728	if (ip_addr_isany(&netif->ip_addr)) {
tax	0:66300c77c6e9	729	for_us = 0;
tax	0:66300c77c6e9	730	} else {
tax	0:66300c77c6e9	731	/* ARP packet directed to us? */
tax	0:66300c77c6e9	732	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
tax	0:66300c77c6e9	733	}
tax	0:66300c77c6e9	734
tax	0:66300c77c6e9	735	/* ARP message directed to us?
tax	0:66300c77c6e9	736	-> add IP address in ARP cache; assume requester wants to talk to us,
tax	0:66300c77c6e9	737	can result in directly sending the queued packets for this host.
tax	0:66300c77c6e9	738	ARP message not directed to us?
tax	0:66300c77c6e9	739	-> update the source IP address in the cache, if present */
tax	0:66300c77c6e9	740	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
tax	0:66300c77c6e9	741	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
tax	0:66300c77c6e9	742
tax	0:66300c77c6e9	743	/* now act on the message itself */
tax	0:66300c77c6e9	744	switch (hdr->opcode) {
tax	0:66300c77c6e9	745	/* ARP request? */
tax	0:66300c77c6e9	746	case PP_HTONS(ARP_REQUEST):
tax	0:66300c77c6e9	747	/* ARP request. If it asked for our address, we send out a
tax	0:66300c77c6e9	748	* reply. In any case, we time-stamp any existing ARP entry,
tax	0:66300c77c6e9	749	* and possiby send out an IP packet that was queued on it. */
tax	0:66300c77c6e9	750
tax	0:66300c77c6e9	751	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
tax	0:66300c77c6e9	752	/* ARP request for our address? */
tax	0:66300c77c6e9	753	if (for_us) {
tax	0:66300c77c6e9	754
tax	0:66300c77c6e9	755	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
tax	0:66300c77c6e9	756	/* Re-use pbuf to send ARP reply.
tax	0:66300c77c6e9	757	Since we are re-using an existing pbuf, we can't call etharp_raw since
tax	0:66300c77c6e9	758	that would allocate a new pbuf. */
tax	0:66300c77c6e9	759	hdr->opcode = htons(ARP_REPLY);
tax	0:66300c77c6e9	760
tax	0:66300c77c6e9	761	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
tax	0:66300c77c6e9	762	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
tax	0:66300c77c6e9	763
tax	0:66300c77c6e9	764	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
tax	0:66300c77c6e9	765	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
tax	0:66300c77c6e9	766	#if LWIP_AUTOIP
tax	0:66300c77c6e9	767	/* If we are using Link-Local, all ARP packets that contain a Link-Local
tax	0:66300c77c6e9	768	* 'sender IP address' MUST be sent using link-layer broadcast instead of
tax	0:66300c77c6e9	769	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
tax	0:66300c77c6e9	770	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
tax	0:66300c77c6e9	771	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	772
tax	0:66300c77c6e9	773	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
tax	0:66300c77c6e9	774	#if LWIP_AUTOIP
tax	0:66300c77c6e9	775	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
tax	0:66300c77c6e9	776	#else /* LWIP_AUTOIP */
tax	0:66300c77c6e9	777	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
tax	0:66300c77c6e9	778	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	779	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
tax	0:66300c77c6e9	780	ETHADDR16_COPY(&ethhdr->src, ethaddr);
tax	0:66300c77c6e9	781
tax	0:66300c77c6e9	782	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
tax	0:66300c77c6e9	783	are already correct, we tested that before */
tax	0:66300c77c6e9	784
tax	0:66300c77c6e9	785	/* return ARP reply */
tax	0:66300c77c6e9	786	netif->linkoutput(netif, p);
tax	0:66300c77c6e9	787	/* we are not configured? */
tax	0:66300c77c6e9	788	} else if (ip_addr_isany(&netif->ip_addr)) {
tax	0:66300c77c6e9	789	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
tax	0:66300c77c6e9	790	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
tax	0:66300c77c6e9	791	/* request was not directed to us */
tax	0:66300c77c6e9	792	} else {
tax	0:66300c77c6e9	793	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
tax	0:66300c77c6e9	794	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
tax	0:66300c77c6e9	795	}
tax	0:66300c77c6e9	796	break;
tax	0:66300c77c6e9	797	case PP_HTONS(ARP_REPLY):
tax	0:66300c77c6e9	798	/* ARP reply. We already updated the ARP cache earlier. */
tax	0:66300c77c6e9	799	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
tax	0:66300c77c6e9	800	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
tax	0:66300c77c6e9	801	/* DHCP wants to know about ARP replies from any host with an
tax	0:66300c77c6e9	802	* IP address also offered to us by the DHCP server. We do not
tax	0:66300c77c6e9	803	* want to take a duplicate IP address on a single network.
tax	0:66300c77c6e9	804	* @todo How should we handle redundant (fail-over) interfaces? */
tax	0:66300c77c6e9	805	dhcp_arp_reply(netif, &sipaddr);
tax	0:66300c77c6e9	806	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
tax	0:66300c77c6e9	807	break;
tax	0:66300c77c6e9	808	default:
tax	0:66300c77c6e9	809	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
tax	0:66300c77c6e9	810	ETHARP_STATS_INC(etharp.err);
tax	0:66300c77c6e9	811	break;
tax	0:66300c77c6e9	812	}
tax	0:66300c77c6e9	813	/* free ARP packet */
tax	0:66300c77c6e9	814	pbuf_free(p);
tax	0:66300c77c6e9	815	}
tax	0:66300c77c6e9	816
tax	0:66300c77c6e9	817	/**
tax	0:66300c77c6e9	818	* Resolve and fill-in Ethernet address header for outgoing IP packet.
tax	0:66300c77c6e9	819	*
tax	0:66300c77c6e9	820	* For IP multicast and broadcast, corresponding Ethernet addresses
tax	0:66300c77c6e9	821	* are selected and the packet is transmitted on the link.
tax	0:66300c77c6e9	822	*
tax	0:66300c77c6e9	823	* For unicast addresses, the packet is submitted to etharp_query(). In
tax	0:66300c77c6e9	824	* case the IP address is outside the local network, the IP address of
tax	0:66300c77c6e9	825	* the gateway is used.
tax	0:66300c77c6e9	826	*
tax	0:66300c77c6e9	827	* @param netif The lwIP network interface which the IP packet will be sent on.
tax	0:66300c77c6e9	828	* @param q The pbuf(s) containing the IP packet to be sent.
tax	0:66300c77c6e9	829	* @param ipaddr The IP address of the packet destination.
tax	0:66300c77c6e9	830	*
tax	0:66300c77c6e9	831	* @return
tax	0:66300c77c6e9	832	* - ERR_RTE No route to destination (no gateway to external networks),
tax	0:66300c77c6e9	833	* or the return type of either etharp_query() or etharp_send_ip().
tax	0:66300c77c6e9	834	*/
tax	0:66300c77c6e9	835	err_t
tax	0:66300c77c6e9	836	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
tax	0:66300c77c6e9	837	{
tax	0:66300c77c6e9	838	struct eth_addr *dest, mcastaddr;
tax	0:66300c77c6e9	839
tax	0:66300c77c6e9	840	/* make room for Ethernet header - should not fail */
tax	0:66300c77c6e9	841	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
tax	0:66300c77c6e9	842	/* bail out */
tax	0:66300c77c6e9	843	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	844	("etharp_output: could not allocate room for header.\n"));
tax	0:66300c77c6e9	845	LINK_STATS_INC(link.lenerr);
tax	0:66300c77c6e9	846	return ERR_BUF;
tax	0:66300c77c6e9	847	}
tax	0:66300c77c6e9	848
tax	0:66300c77c6e9	849	/* assume unresolved Ethernet address */
tax	0:66300c77c6e9	850	dest = NULL;
tax	0:66300c77c6e9	851	/* Determine on destination hardware address. Broadcasts and multicasts
tax	0:66300c77c6e9	852	* are special, other IP addresses are looked up in the ARP table. */
tax	0:66300c77c6e9	853
tax	0:66300c77c6e9	854	/* broadcast destination IP address? */
tax	0:66300c77c6e9	855	if (ip_addr_isbroadcast(ipaddr, netif)) {
tax	0:66300c77c6e9	856	/* broadcast on Ethernet also */
tax	0:66300c77c6e9	857	dest = (struct eth_addr *)&ethbroadcast;
tax	0:66300c77c6e9	858	/* multicast destination IP address? */
tax	0:66300c77c6e9	859	} else if (ip_addr_ismulticast(ipaddr)) {
tax	0:66300c77c6e9	860	/* Hash IP multicast address to MAC address.*/
tax	0:66300c77c6e9	861	mcastaddr.addr[0] = 0x01;
tax	0:66300c77c6e9	862	mcastaddr.addr[1] = 0x00;
tax	0:66300c77c6e9	863	mcastaddr.addr[2] = 0x5e;
tax	0:66300c77c6e9	864	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
tax	0:66300c77c6e9	865	mcastaddr.addr[4] = ip4_addr3(ipaddr);
tax	0:66300c77c6e9	866	mcastaddr.addr[5] = ip4_addr4(ipaddr);
tax	0:66300c77c6e9	867	/* destination Ethernet address is multicast */
tax	0:66300c77c6e9	868	dest = &mcastaddr;
tax	0:66300c77c6e9	869	/* unicast destination IP address? */
tax	0:66300c77c6e9	870	} else {
tax	0:66300c77c6e9	871	/* outside local network? */
tax	0:66300c77c6e9	872	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
tax	0:66300c77c6e9	873	!ip_addr_islinklocal(ipaddr)) {
tax	0:66300c77c6e9	874	/* interface has default gateway? */
tax	0:66300c77c6e9	875	if (!ip_addr_isany(&netif->gw)) {
tax	0:66300c77c6e9	876	/* send to hardware address of default gateway IP address */
tax	0:66300c77c6e9	877	ipaddr = &(netif->gw);
tax	0:66300c77c6e9	878	/* no default gateway available */
tax	0:66300c77c6e9	879	} else {
tax	0:66300c77c6e9	880	/* no route to destination error (default gateway missing) */
tax	0:66300c77c6e9	881	return ERR_RTE;
tax	0:66300c77c6e9	882	}
tax	0:66300c77c6e9	883	}
tax	0:66300c77c6e9	884	#if LWIP_NETIF_HWADDRHINT
tax	0:66300c77c6e9	885	if (netif->addr_hint != NULL) {
tax	0:66300c77c6e9	886	/* per-pcb cached entry was given */
tax	0:66300c77c6e9	887	u8_t etharp_cached_entry = *(netif->addr_hint);
tax	0:66300c77c6e9	888	if (etharp_cached_entry < ARP_TABLE_SIZE) {
tax	0:66300c77c6e9	889	#endif /* LWIP_NETIF_HWADDRHINT */
tax	0:66300c77c6e9	890	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
tax	0:66300c77c6e9	891	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
tax	0:66300c77c6e9	892	/* the per-pcb-cached entry is stable and the right one! */
tax	0:66300c77c6e9	893	ETHARP_STATS_INC(etharp.cachehit);
tax	0:66300c77c6e9	894	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
tax	0:66300c77c6e9	895	&arp_table[etharp_cached_entry].ethaddr);
tax	0:66300c77c6e9	896	}
tax	0:66300c77c6e9	897	#if LWIP_NETIF_HWADDRHINT
tax	0:66300c77c6e9	898	}
tax	0:66300c77c6e9	899	}
tax	0:66300c77c6e9	900	#endif /* LWIP_NETIF_HWADDRHINT */
tax	0:66300c77c6e9	901	/* queue on destination Ethernet address belonging to ipaddr */
tax	0:66300c77c6e9	902	return etharp_query(netif, ipaddr, q);
tax	0:66300c77c6e9	903	}
tax	0:66300c77c6e9	904
tax	0:66300c77c6e9	905	/* continuation for multicast/broadcast destinations */
tax	0:66300c77c6e9	906	/* obtain source Ethernet address of the given interface */
tax	0:66300c77c6e9	907	/* send packet directly on the link */
tax	0:66300c77c6e9	908	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
tax	0:66300c77c6e9	909	}
tax	0:66300c77c6e9	910
tax	0:66300c77c6e9	911	/**
tax	0:66300c77c6e9	912	* Send an ARP request for the given IP address and/or queue a packet.
tax	0:66300c77c6e9	913	*
tax	0:66300c77c6e9	914	* If the IP address was not yet in the cache, a pending ARP cache entry
tax	0:66300c77c6e9	915	* is added and an ARP request is sent for the given address. The packet
tax	0:66300c77c6e9	916	* is queued on this entry.
tax	0:66300c77c6e9	917	*
tax	0:66300c77c6e9	918	* If the IP address was already pending in the cache, a new ARP request
tax	0:66300c77c6e9	919	* is sent for the given address. The packet is queued on this entry.
tax	0:66300c77c6e9	920	*
tax	0:66300c77c6e9	921	* If the IP address was already stable in the cache, and a packet is
tax	0:66300c77c6e9	922	* given, it is directly sent and no ARP request is sent out.
tax	0:66300c77c6e9	923	*
tax	0:66300c77c6e9	924	* If the IP address was already stable in the cache, and no packet is
tax	0:66300c77c6e9	925	* given, an ARP request is sent out.
tax	0:66300c77c6e9	926	*
tax	0:66300c77c6e9	927	* @param netif The lwIP network interface on which ipaddr
tax	0:66300c77c6e9	928	* must be queried for.
tax	0:66300c77c6e9	929	* @param ipaddr The IP address to be resolved.
tax	0:66300c77c6e9	930	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
tax	0:66300c77c6e9	931	* q is not freed by this function.
tax	0:66300c77c6e9	932	*
tax	0:66300c77c6e9	933	* @note q must only be ONE packet, not a packet queue!
tax	0:66300c77c6e9	934	*
tax	0:66300c77c6e9	935	* @return
tax	0:66300c77c6e9	936	* - ERR_BUF Could not make room for Ethernet header.
tax	0:66300c77c6e9	937	* - ERR_MEM Hardware address unknown, and no more ARP entries available
tax	0:66300c77c6e9	938	* to query for address or queue the packet.
tax	0:66300c77c6e9	939	* - ERR_MEM Could not queue packet due to memory shortage.
tax	0:66300c77c6e9	940	* - ERR_RTE No route to destination (no gateway to external networks).
tax	0:66300c77c6e9	941	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
tax	0:66300c77c6e9	942	*
tax	0:66300c77c6e9	943	*/
tax	0:66300c77c6e9	944	err_t
tax	0:66300c77c6e9	945	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
tax	0:66300c77c6e9	946	{
tax	0:66300c77c6e9	947	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
tax	0:66300c77c6e9	948	err_t result = ERR_MEM;
tax	0:66300c77c6e9	949	s8_t i; /* ARP entry index */
tax	0:66300c77c6e9	950
tax	0:66300c77c6e9	951	/* non-unicast address? */
tax	0:66300c77c6e9	952	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
tax	0:66300c77c6e9	953	ip_addr_ismulticast(ipaddr) \|\|
tax	0:66300c77c6e9	954	ip_addr_isany(ipaddr)) {
tax	0:66300c77c6e9	955	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
tax	0:66300c77c6e9	956	return ERR_ARG;
tax	0:66300c77c6e9	957	}
tax	0:66300c77c6e9	958
tax	0:66300c77c6e9	959	/* find entry in ARP cache, ask to create entry if queueing packet */
tax	0:66300c77c6e9	960	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
tax	0:66300c77c6e9	961
tax	0:66300c77c6e9	962	/* could not find or create entry? */
tax	0:66300c77c6e9	963	if (i < 0) {
tax	0:66300c77c6e9	964	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
tax	0:66300c77c6e9	965	if (q) {
tax	0:66300c77c6e9	966	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
tax	0:66300c77c6e9	967	ETHARP_STATS_INC(etharp.memerr);
tax	0:66300c77c6e9	968	}
tax	0:66300c77c6e9	969	return (err_t)i;
tax	0:66300c77c6e9	970	}
tax	0:66300c77c6e9	971
tax	0:66300c77c6e9	972	/* mark a fresh entry as pending (we just sent a request) */
tax	0:66300c77c6e9	973	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
tax	0:66300c77c6e9	974	arp_table[i].state = ETHARP_STATE_PENDING;
tax	0:66300c77c6e9	975	}
tax	0:66300c77c6e9	976
tax	0:66300c77c6e9	977	/* { i is either a STABLE or (new or existing) PENDING entry } */
tax	0:66300c77c6e9	978	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
tax	0:66300c77c6e9	979	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
tax	0:66300c77c6e9	980	(arp_table[i].state == ETHARP_STATE_STABLE)));
tax	0:66300c77c6e9	981
tax	0:66300c77c6e9	982	/* do we have a pending entry? or an implicit query request? */
tax	0:66300c77c6e9	983	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
tax	0:66300c77c6e9	984	/* try to resolve it; send out ARP request */
tax	0:66300c77c6e9	985	result = etharp_request(netif, ipaddr);
tax	0:66300c77c6e9	986	if (result != ERR_OK) {
tax	0:66300c77c6e9	987	/* ARP request couldn't be sent */
tax	0:66300c77c6e9	988	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
tax	0:66300c77c6e9	989	since this failure could be temporary, and the next packet calling
tax	0:66300c77c6e9	990	etharp_query again could lead to sending the queued packets. */
tax	0:66300c77c6e9	991	}
tax	0:66300c77c6e9	992	if (q == NULL) {
tax	0:66300c77c6e9	993	return result;
tax	0:66300c77c6e9	994	}
tax	0:66300c77c6e9	995	}
tax	0:66300c77c6e9	996
tax	0:66300c77c6e9	997	/* packet given? */
tax	0:66300c77c6e9	998	LWIP_ASSERT("q != NULL", q != NULL);
tax	0:66300c77c6e9	999	/* stable entry? */
tax	0:66300c77c6e9	1000	if (arp_table[i].state == ETHARP_STATE_STABLE) {
tax	0:66300c77c6e9	1001	/* we have a valid IP->Ethernet address mapping */
tax	0:66300c77c6e9	1002	ETHARP_SET_HINT(netif, i);
tax	0:66300c77c6e9	1003	/* send the packet */
tax	0:66300c77c6e9	1004	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
tax	0:66300c77c6e9	1005	/* pending entry? (either just created or already pending */
tax	0:66300c77c6e9	1006	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
tax	0:66300c77c6e9	1007	#if ARP_QUEUEING /* queue the given q packet */
tax	0:66300c77c6e9	1008	struct pbuf *p;
tax	0:66300c77c6e9	1009	int copy_needed = 0;
tax	0:66300c77c6e9	1010	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
tax	0:66300c77c6e9	1011	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
tax	0:66300c77c6e9	1012	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
tax	0:66300c77c6e9	1013	p = q;
tax	0:66300c77c6e9	1014	while (p) {
tax	0:66300c77c6e9	1015	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
tax	0:66300c77c6e9	1016	if(p->type != PBUF_ROM) {
tax	0:66300c77c6e9	1017	copy_needed = 1;
tax	0:66300c77c6e9	1018	break;
tax	0:66300c77c6e9	1019	}
tax	0:66300c77c6e9	1020	p = p->next;
tax	0:66300c77c6e9	1021	}
tax	0:66300c77c6e9	1022	if(copy_needed) {
tax	0:66300c77c6e9	1023	/* copy the whole packet into new pbufs */
tax	0:66300c77c6e9	1024	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
tax	0:66300c77c6e9	1025	if(p != NULL) {
tax	0:66300c77c6e9	1026	if (pbuf_copy(p, q) != ERR_OK) {
tax	0:66300c77c6e9	1027	pbuf_free(p);
tax	0:66300c77c6e9	1028	p = NULL;
tax	0:66300c77c6e9	1029	}
tax	0:66300c77c6e9	1030	}
tax	0:66300c77c6e9	1031	} else {
tax	0:66300c77c6e9	1032	/* referencing the old pbuf is enough */
tax	0:66300c77c6e9	1033	p = q;
tax	0:66300c77c6e9	1034	pbuf_ref(p);
tax	0:66300c77c6e9	1035	}
tax	0:66300c77c6e9	1036	/* packet could be taken over? */
tax	0:66300c77c6e9	1037	if (p != NULL) {
tax	0:66300c77c6e9	1038	/* queue packet ... */
tax	0:66300c77c6e9	1039	struct etharp_q_entry *new_entry;
tax	0:66300c77c6e9	1040	/* allocate a new arp queue entry */
tax	0:66300c77c6e9	1041	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
tax	0:66300c77c6e9	1042	if (new_entry != NULL) {
tax	0:66300c77c6e9	1043	new_entry->next = 0;
tax	0:66300c77c6e9	1044	new_entry->p = p;
tax	0:66300c77c6e9	1045	if(arp_table[i].q != NULL) {
tax	0:66300c77c6e9	1046	/* queue was already existent, append the new entry to the end */
tax	0:66300c77c6e9	1047	struct etharp_q_entry *r;
tax	0:66300c77c6e9	1048	r = arp_table[i].q;
tax	0:66300c77c6e9	1049	while (r->next != NULL) {
tax	0:66300c77c6e9	1050	r = r->next;
tax	0:66300c77c6e9	1051	}
tax	0:66300c77c6e9	1052	r->next = new_entry;
tax	0:66300c77c6e9	1053	} else {
tax	0:66300c77c6e9	1054	/* queue did not exist, first item in queue */
tax	0:66300c77c6e9	1055	arp_table[i].q = new_entry;
tax	0:66300c77c6e9	1056	}
tax	0:66300c77c6e9	1057	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
tax	0:66300c77c6e9	1058	result = ERR_OK;
tax	0:66300c77c6e9	1059	} else {
tax	0:66300c77c6e9	1060	/* the pool MEMP_ARP_QUEUE is empty */
tax	0:66300c77c6e9	1061	pbuf_free(p);
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	1063	/* { result == ERR_MEM } through initialization */
tax	0:66300c77c6e9	1064	}
tax	0:66300c77c6e9	1065	} else {
tax	0:66300c77c6e9	1066	ETHARP_STATS_INC(etharp.memerr);
tax	0:66300c77c6e9	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));
tax	0:66300c77c6e9	1068	/* { result == ERR_MEM } through initialization */
tax	0:66300c77c6e9	1069	}
tax	0:66300c77c6e9	1070	#else /* ARP_QUEUEING */
tax	0:66300c77c6e9	1071	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
tax	0:66300c77c6e9	1072	/* { result == ERR_MEM } through initialization */
tax	0:66300c77c6e9	1073	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
tax	0:66300c77c6e9	1074	#endif /* ARP_QUEUEING */
tax	0:66300c77c6e9	1075	}
tax	0:66300c77c6e9	1076	return result;
tax	0:66300c77c6e9	1077	}
tax	0:66300c77c6e9	1078
tax	0:66300c77c6e9	1079	/**
tax	0:66300c77c6e9	1080	* Send a raw ARP packet (opcode and all addresses can be modified)
tax	0:66300c77c6e9	1081	*
tax	0:66300c77c6e9	1082	* @param netif the lwip network interface on which to send the ARP packet
tax	0:66300c77c6e9	1083	* @param ethsrc_addr the source MAC address for the ethernet header
tax	0:66300c77c6e9	1084	* @param ethdst_addr the destination MAC address for the ethernet header
tax	0:66300c77c6e9	1085	* @param hwsrc_addr the source MAC address for the ARP protocol header
tax	0:66300c77c6e9	1086	* @param ipsrc_addr the source IP address for the ARP protocol header
tax	0:66300c77c6e9	1087	* @param hwdst_addr the destination MAC address for the ARP protocol header
tax	0:66300c77c6e9	1088	* @param ipdst_addr the destination IP address for the ARP protocol header
tax	0:66300c77c6e9	1089	* @param opcode the type of the ARP packet
tax	0:66300c77c6e9	1090	* @return ERR_OK if the ARP packet has been sent
tax	0:66300c77c6e9	1091	* ERR_MEM if the ARP packet couldn't be allocated
tax	0:66300c77c6e9	1092	* any other err_t on failure
tax	0:66300c77c6e9	1093	*/
tax	0:66300c77c6e9	1094	#if !LWIP_AUTOIP
tax	0:66300c77c6e9	1095	static
tax	0:66300c77c6e9	1096	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	1097	err_t
tax	0:66300c77c6e9	1098	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
tax	0:66300c77c6e9	1099	const struct eth_addr *ethdst_addr,
tax	0:66300c77c6e9	1100	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
tax	0:66300c77c6e9	1101	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
tax	0:66300c77c6e9	1102	const u16_t opcode)
tax	0:66300c77c6e9	1103	{
tax	0:66300c77c6e9	1104	struct pbuf *p;
tax	0:66300c77c6e9	1105	err_t result = ERR_OK;
tax	0:66300c77c6e9	1106	struct eth_hdr *ethhdr;
tax	0:66300c77c6e9	1107	struct etharp_hdr *hdr;
tax	0:66300c77c6e9	1108	#if LWIP_AUTOIP
tax	0:66300c77c6e9	1109	const u8_t * ethdst_hwaddr;
tax	0:66300c77c6e9	1110	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	1111
tax	0:66300c77c6e9	1112	/* allocate a pbuf for the outgoing ARP request packet */
tax	0:66300c77c6e9	1113	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
tax	0:66300c77c6e9	1114	/* could allocate a pbuf for an ARP request? */
tax	0:66300c77c6e9	1115	if (p == NULL) {
tax	0:66300c77c6e9	1116	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	1117	("etharp_raw: could not allocate pbuf for ARP request.\n"));
tax	0:66300c77c6e9	1118	ETHARP_STATS_INC(etharp.memerr);
tax	0:66300c77c6e9	1119	return ERR_MEM;
tax	0:66300c77c6e9	1120	}
tax	0:66300c77c6e9	1121	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
tax	0:66300c77c6e9	1122	(p->len >= SIZEOF_ETHARP_PACKET));
tax	0:66300c77c6e9	1123
tax	0:66300c77c6e9	1124	ethhdr = (struct eth_hdr *)p->payload;
tax	0:66300c77c6e9	1125	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
tax	0:66300c77c6e9	1126	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
tax	0:66300c77c6e9	1127	hdr->opcode = htons(opcode);
tax	0:66300c77c6e9	1128
tax	0:66300c77c6e9	1129	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
tax	0:66300c77c6e9	1130	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
tax	0:66300c77c6e9	1131	#if LWIP_AUTOIP
tax	0:66300c77c6e9	1132	/* If we are using Link-Local, all ARP packets that contain a Link-Local
tax	0:66300c77c6e9	1133	* 'sender IP address' MUST be sent using link-layer broadcast instead of
tax	0:66300c77c6e9	1134	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
tax	0:66300c77c6e9	1135	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
tax	0:66300c77c6e9	1136	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	1137	/* Write the ARP MAC-Addresses */
tax	0:66300c77c6e9	1138	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
tax	0:66300c77c6e9	1139	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
tax	0:66300c77c6e9	1140	/* Write the Ethernet MAC-Addresses */
tax	0:66300c77c6e9	1141	#if LWIP_AUTOIP
tax	0:66300c77c6e9	1142	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
tax	0:66300c77c6e9	1143	#else /* LWIP_AUTOIP */
tax	0:66300c77c6e9	1144	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
tax	0:66300c77c6e9	1145	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	1146	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
tax	0:66300c77c6e9	1147	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
tax	0:66300c77c6e9	1148	* structure packing. */
tax	0:66300c77c6e9	1149	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
tax	0:66300c77c6e9	1150	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
tax	0:66300c77c6e9	1151
tax	0:66300c77c6e9	1152	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
tax	0:66300c77c6e9	1153	hdr->proto = PP_HTONS(ETHTYPE_IP);
tax	0:66300c77c6e9	1154	/* set hwlen and protolen */
tax	0:66300c77c6e9	1155	hdr->hwlen = ETHARP_HWADDR_LEN;
tax	0:66300c77c6e9	1156	hdr->protolen = sizeof(ip_addr_t);
tax	0:66300c77c6e9	1157
tax	0:66300c77c6e9	1158	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
tax	0:66300c77c6e9	1159	/* send ARP query */
tax	0:66300c77c6e9	1160	result = netif->linkoutput(netif, p);
tax	0:66300c77c6e9	1161	ETHARP_STATS_INC(etharp.xmit);
tax	0:66300c77c6e9	1162	/* free ARP query packet */
tax	0:66300c77c6e9	1163	pbuf_free(p);
tax	0:66300c77c6e9	1164	p = NULL;
tax	0:66300c77c6e9	1165	/* could not allocate pbuf for ARP request */
tax	0:66300c77c6e9	1166
tax	0:66300c77c6e9	1167	return result;
tax	0:66300c77c6e9	1168	}
tax	0:66300c77c6e9	1169
tax	0:66300c77c6e9	1170	/**
tax	0:66300c77c6e9	1171	* Send an ARP request packet asking for ipaddr.
tax	0:66300c77c6e9	1172	*
tax	0:66300c77c6e9	1173	* @param netif the lwip network interface on which to send the request
tax	0:66300c77c6e9	1174	* @param ipaddr the IP address for which to ask
tax	0:66300c77c6e9	1175	* @return ERR_OK if the request has been sent
tax	0:66300c77c6e9	1176	* ERR_MEM if the ARP packet couldn't be allocated
tax	0:66300c77c6e9	1177	* any other err_t on failure
tax	0:66300c77c6e9	1178	*/
tax	0:66300c77c6e9	1179	err_t
tax	0:66300c77c6e9	1180	etharp_request(struct netif netif, ip_addr_t ipaddr)
tax	0:66300c77c6e9	1181	{
tax	0:66300c77c6e9	1182	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
tax	0:66300c77c6e9	1183	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
tax	0:66300c77c6e9	1184	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
tax	0:66300c77c6e9	1185	ipaddr, ARP_REQUEST);
tax	0:66300c77c6e9	1186	}
tax	0:66300c77c6e9	1187	#endif /* LWIP_ARP */
tax	0:66300c77c6e9	1188
tax	0:66300c77c6e9	1189	/**
tax	0:66300c77c6e9	1190	* Process received ethernet frames. Using this function instead of directly
tax	0:66300c77c6e9	1191	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
tax	0:66300c77c6e9	1192	* the ARP cache is protected from concurrent access.
tax	0:66300c77c6e9	1193	*
tax	0:66300c77c6e9	1194	* @param p the recevied packet, p->payload pointing to the ethernet header
tax	0:66300c77c6e9	1195	* @param netif the network interface on which the packet was received
tax	0:66300c77c6e9	1196	*/
tax	0:66300c77c6e9	1197	err_t
tax	0:66300c77c6e9	1198	ethernet_input(struct pbuf p, struct netif netif)
tax	0:66300c77c6e9	1199	{
tax	0:66300c77c6e9	1200	struct eth_hdr* ethhdr;
tax	0:66300c77c6e9	1201	u16_t type;
tax	0:66300c77c6e9	1202
tax	0:66300c77c6e9	1203	/* points to packet payload, which starts with an Ethernet header */
tax	0:66300c77c6e9	1204	ethhdr = (struct eth_hdr *)p->payload;
tax	0:66300c77c6e9	1205	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
tax	0:66300c77c6e9	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",
tax	0:66300c77c6e9	1207	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
tax	0:66300c77c6e9	1208	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
tax	0:66300c77c6e9	1209	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
tax	0:66300c77c6e9	1210	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
tax	0:66300c77c6e9	1211	(unsigned)htons(ethhdr->type)));
tax	0:66300c77c6e9	1212
tax	0:66300c77c6e9	1213	type = ethhdr->type;
tax	0:66300c77c6e9	1214	#if ETHARP_SUPPORT_VLAN
tax	0:66300c77c6e9	1215	if (type == PP_HTONS(ETHTYPE_VLAN)) {
tax	0:66300c77c6e9	1216	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
tax	0:66300c77c6e9	1217	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
tax	0:66300c77c6e9	1218	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
tax	0:66300c77c6e9	1219	/* silently ignore this packet: not for our VLAN */
tax	0:66300c77c6e9	1220	pbuf_free(p);
tax	0:66300c77c6e9	1221	return ERR_OK;
tax	0:66300c77c6e9	1222	}
tax	0:66300c77c6e9	1223	#endif /* ETHARP_VLAN_CHECK */
tax	0:66300c77c6e9	1224	type = vlan->tpid;
tax	0:66300c77c6e9	1225	}
tax	0:66300c77c6e9	1226	#endif /* ETHARP_SUPPORT_VLAN */
tax	0:66300c77c6e9	1227
tax	0:66300c77c6e9	1228	#if LWIP_ARP_FILTER_NETIF
tax	0:66300c77c6e9	1229	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
tax	0:66300c77c6e9	1230	#endif /* LWIP_ARP_FILTER_NETIF*/
tax	0:66300c77c6e9	1231
tax	0:66300c77c6e9	1232	switch (type) {
tax	0:66300c77c6e9	1233	#if LWIP_ARP
tax	0:66300c77c6e9	1234	/* IP packet? */
tax	0:66300c77c6e9	1235	case PP_HTONS(ETHTYPE_IP):
tax	0:66300c77c6e9	1236	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
tax	0:66300c77c6e9	1237	goto free_and_return;
tax	0:66300c77c6e9	1238	}
tax	0:66300c77c6e9	1239	#if ETHARP_TRUST_IP_MAC
tax	0:66300c77c6e9	1240	/* update ARP table */
tax	0:66300c77c6e9	1241	etharp_ip_input(netif, p);
tax	0:66300c77c6e9	1242	#endif /* ETHARP_TRUST_IP_MAC */
tax	0:66300c77c6e9	1243	/* skip Ethernet header */
tax	0:66300c77c6e9	1244	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
tax	0:66300c77c6e9	1245	LWIP_ASSERT("Can't move over header in packet", 0);
tax	0:66300c77c6e9	1246	goto free_and_return;
tax	0:66300c77c6e9	1247	} else {
tax	0:66300c77c6e9	1248	/* pass to IP layer */
tax	0:66300c77c6e9	1249	ip_input(p, netif);
tax	0:66300c77c6e9	1250	}
tax	0:66300c77c6e9	1251	break;
tax	0:66300c77c6e9	1252
tax	0:66300c77c6e9	1253	case PP_HTONS(ETHTYPE_ARP):
tax	0:66300c77c6e9	1254	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
tax	0:66300c77c6e9	1255	goto free_and_return;
tax	0:66300c77c6e9	1256	}
tax	0:66300c77c6e9	1257	/* pass p to ARP module */
tax	0:66300c77c6e9	1258	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
tax	0:66300c77c6e9	1259	break;
tax	0:66300c77c6e9	1260	#endif /* LWIP_ARP */
tax	0:66300c77c6e9	1261	#if PPPOE_SUPPORT
tax	0:66300c77c6e9	1262	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
tax	0:66300c77c6e9	1263	pppoe_disc_input(netif, p);
tax	0:66300c77c6e9	1264	break;
tax	0:66300c77c6e9	1265
tax	0:66300c77c6e9	1266	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
tax	0:66300c77c6e9	1267	pppoe_data_input(netif, p);
tax	0:66300c77c6e9	1268	break;
tax	0:66300c77c6e9	1269	#endif /* PPPOE_SUPPORT */
tax	0:66300c77c6e9	1270
tax	0:66300c77c6e9	1271	default:
tax	0:66300c77c6e9	1272	ETHARP_STATS_INC(etharp.proterr);
tax	0:66300c77c6e9	1273	ETHARP_STATS_INC(etharp.drop);
tax	0:66300c77c6e9	1274	goto free_and_return;
tax	0:66300c77c6e9	1275	}
tax	0:66300c77c6e9	1276
tax	0:66300c77c6e9	1277	/* This means the pbuf is freed or consumed,
tax	0:66300c77c6e9	1278	so the caller doesn't have to free it again */
tax	0:66300c77c6e9	1279	return ERR_OK;
tax	0:66300c77c6e9	1280
tax	0:66300c77c6e9	1281	free_and_return:
tax	0:66300c77c6e9	1282	pbuf_free(p);
tax	0:66300c77c6e9	1283	return ERR_OK;
tax	0:66300c77c6e9	1284	}
tax	0:66300c77c6e9	1285	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/netif/etharp.c@0:66300c77c6e9, 2011-03-29 (annotated)

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