ublox_C200Test - Integrating the ublox LISA C200 modem

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Integrating the ublox LISA C200 modem

Fork of SprintUSBModemHTTPClientTest by Donatien Garnier

SprintUSBModem/lwip/netif/etharp.c@5:3f93dd1d4cb3, 2013-09-26 (annotated)

Committer:: sam_grove
Date:: Thu Sep 26 00:44:20 2013 -0500
Revision:: 5:3f93dd1d4cb3

Exported program and replaced contents of the repo with the source

to build and debug using keil mdk. Libs NOT upto date are lwip, lwip-sys

and socket. these have newer versions under mbed_official but were starting

from a know working point

Who changed what in which revision?

User	Revision	Line number	New contents of line
sam_grove	5:3f93dd1d4cb3	1	/**
sam_grove	5:3f93dd1d4cb3	2	* @file
sam_grove	5:3f93dd1d4cb3	3	* Address Resolution Protocol module for IP over Ethernet
sam_grove	5:3f93dd1d4cb3	4	*
sam_grove	5:3f93dd1d4cb3	5	* Functionally, ARP is divided into two parts. The first maps an IP address
sam_grove	5:3f93dd1d4cb3	6	* to a physical address when sending a packet, and the second part answers
sam_grove	5:3f93dd1d4cb3	7	* requests from other machines for our physical address.
sam_grove	5:3f93dd1d4cb3	8	*
sam_grove	5:3f93dd1d4cb3	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
sam_grove	5:3f93dd1d4cb3	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
sam_grove	5:3f93dd1d4cb3	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
sam_grove	5:3f93dd1d4cb3	12	*/
sam_grove	5:3f93dd1d4cb3	13
sam_grove	5:3f93dd1d4cb3	14	/*
sam_grove	5:3f93dd1d4cb3	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
sam_grove	5:3f93dd1d4cb3	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
sam_grove	5:3f93dd1d4cb3	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
sam_grove	5:3f93dd1d4cb3	18	* All rights reserved.
sam_grove	5:3f93dd1d4cb3	19	*
sam_grove	5:3f93dd1d4cb3	20	* Redistribution and use in source and binary forms, with or without modification,
sam_grove	5:3f93dd1d4cb3	21	* are permitted provided that the following conditions are met:
sam_grove	5:3f93dd1d4cb3	22	*
sam_grove	5:3f93dd1d4cb3	23	* 1. Redistributions of source code must retain the above copyright notice,
sam_grove	5:3f93dd1d4cb3	24	* this list of conditions and the following disclaimer.
sam_grove	5:3f93dd1d4cb3	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
sam_grove	5:3f93dd1d4cb3	26	* this list of conditions and the following disclaimer in the documentation
sam_grove	5:3f93dd1d4cb3	27	* and/or other materials provided with the distribution.
sam_grove	5:3f93dd1d4cb3	28	* 3. The name of the author may not be used to endorse or promote products
sam_grove	5:3f93dd1d4cb3	29	* derived from this software without specific prior written permission.
sam_grove	5:3f93dd1d4cb3	30	*
sam_grove	5:3f93dd1d4cb3	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
sam_grove	5:3f93dd1d4cb3	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
sam_grove	5:3f93dd1d4cb3	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
sam_grove	5:3f93dd1d4cb3	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sam_grove	5:3f93dd1d4cb3	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
sam_grove	5:3f93dd1d4cb3	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sam_grove	5:3f93dd1d4cb3	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sam_grove	5:3f93dd1d4cb3	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sam_grove	5:3f93dd1d4cb3	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
sam_grove	5:3f93dd1d4cb3	40	* OF SUCH DAMAGE.
sam_grove	5:3f93dd1d4cb3	41	*
sam_grove	5:3f93dd1d4cb3	42	* This file is part of the lwIP TCP/IP stack.
sam_grove	5:3f93dd1d4cb3	43	*
sam_grove	5:3f93dd1d4cb3	44	*/
sam_grove	5:3f93dd1d4cb3	45
sam_grove	5:3f93dd1d4cb3	46	#include "lwip/opt.h"
sam_grove	5:3f93dd1d4cb3	47
sam_grove	5:3f93dd1d4cb3	48	#if LWIP_ARP \|\| LWIP_ETHERNET
sam_grove	5:3f93dd1d4cb3	49
sam_grove	5:3f93dd1d4cb3	50	#include "lwip/ip_addr.h"
sam_grove	5:3f93dd1d4cb3	51	#include "lwip/def.h"
sam_grove	5:3f93dd1d4cb3	52	#include "lwip/ip.h"
sam_grove	5:3f93dd1d4cb3	53	#include "lwip/stats.h"
sam_grove	5:3f93dd1d4cb3	54	#include "lwip/snmp.h"
sam_grove	5:3f93dd1d4cb3	55	#include "lwip/dhcp.h"
sam_grove	5:3f93dd1d4cb3	56	#include "lwip/autoip.h"
sam_grove	5:3f93dd1d4cb3	57	#include "netif/etharp.h"
sam_grove	5:3f93dd1d4cb3	58
sam_grove	5:3f93dd1d4cb3	59	#if PPPOE_SUPPORT
sam_grove	5:3f93dd1d4cb3	60	#include "netif/ppp_oe.h"
sam_grove	5:3f93dd1d4cb3	61	#endif /* PPPOE_SUPPORT */
sam_grove	5:3f93dd1d4cb3	62
sam_grove	5:3f93dd1d4cb3	63	#include <string.h>
sam_grove	5:3f93dd1d4cb3	64
sam_grove	5:3f93dd1d4cb3	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
sam_grove	5:3f93dd1d4cb3	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
sam_grove	5:3f93dd1d4cb3	67
sam_grove	5:3f93dd1d4cb3	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
sam_grove	5:3f93dd1d4cb3	69
sam_grove	5:3f93dd1d4cb3	70	/** the time an ARP entry stays valid after its last update,
sam_grove	5:3f93dd1d4cb3	71	* for ARP_TMR_INTERVAL = 5000, this is
sam_grove	5:3f93dd1d4cb3	72	* (240 * 5) seconds = 20 minutes.
sam_grove	5:3f93dd1d4cb3	73	*/
sam_grove	5:3f93dd1d4cb3	74	#define ARP_MAXAGE 240
sam_grove	5:3f93dd1d4cb3	75	/** the time an ARP entry stays pending after first request,
sam_grove	5:3f93dd1d4cb3	76	* for ARP_TMR_INTERVAL = 5000, this is
sam_grove	5:3f93dd1d4cb3	77	* (2 * 5) seconds = 10 seconds.
sam_grove	5:3f93dd1d4cb3	78	*
sam_grove	5:3f93dd1d4cb3	79	* @internal Keep this number at least 2, otherwise it might
sam_grove	5:3f93dd1d4cb3	80	* run out instantly if the timeout occurs directly after a request.
sam_grove	5:3f93dd1d4cb3	81	*/
sam_grove	5:3f93dd1d4cb3	82	#define ARP_MAXPENDING 2
sam_grove	5:3f93dd1d4cb3	83
sam_grove	5:3f93dd1d4cb3	84	#define HWTYPE_ETHERNET 1
sam_grove	5:3f93dd1d4cb3	85
sam_grove	5:3f93dd1d4cb3	86	enum etharp_state {
sam_grove	5:3f93dd1d4cb3	87	ETHARP_STATE_EMPTY = 0,
sam_grove	5:3f93dd1d4cb3	88	ETHARP_STATE_PENDING,
sam_grove	5:3f93dd1d4cb3	89	ETHARP_STATE_STABLE
sam_grove	5:3f93dd1d4cb3	90	};
sam_grove	5:3f93dd1d4cb3	91
sam_grove	5:3f93dd1d4cb3	92	struct etharp_entry {
sam_grove	5:3f93dd1d4cb3	93	#if ARP_QUEUEING
sam_grove	5:3f93dd1d4cb3	94	/** Pointer to queue of pending outgoing packets on this ARP entry. */
sam_grove	5:3f93dd1d4cb3	95	struct etharp_q_entry *q;
sam_grove	5:3f93dd1d4cb3	96	#else /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	97	/** Pointer to a single pending outgoing packet on this ARP entry. */
sam_grove	5:3f93dd1d4cb3	98	struct pbuf *q;
sam_grove	5:3f93dd1d4cb3	99	#endif /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	100	ip_addr_t ipaddr;
sam_grove	5:3f93dd1d4cb3	101	struct eth_addr ethaddr;
sam_grove	5:3f93dd1d4cb3	102	#if LWIP_SNMP
sam_grove	5:3f93dd1d4cb3	103	struct netif *netif;
sam_grove	5:3f93dd1d4cb3	104	#endif /* LWIP_SNMP */
sam_grove	5:3f93dd1d4cb3	105	u8_t state;
sam_grove	5:3f93dd1d4cb3	106	u8_t ctime;
sam_grove	5:3f93dd1d4cb3	107	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	108	u8_t static_entry;
sam_grove	5:3f93dd1d4cb3	109	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	110	};
sam_grove	5:3f93dd1d4cb3	111
sam_grove	5:3f93dd1d4cb3	112	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
sam_grove	5:3f93dd1d4cb3	113
sam_grove	5:3f93dd1d4cb3	114	#if !LWIP_NETIF_HWADDRHINT
sam_grove	5:3f93dd1d4cb3	115	static u8_t etharp_cached_entry;
sam_grove	5:3f93dd1d4cb3	116	#endif /* !LWIP_NETIF_HWADDRHINT */
sam_grove	5:3f93dd1d4cb3	117
sam_grove	5:3f93dd1d4cb3	118	/** Try hard to create a new entry - we want the IP address to appear in
sam_grove	5:3f93dd1d4cb3	119	the cache (even if this means removing an active entry or so). */
sam_grove	5:3f93dd1d4cb3	120	#define ETHARP_FLAG_TRY_HARD 1
sam_grove	5:3f93dd1d4cb3	121	#define ETHARP_FLAG_FIND_ONLY 2
sam_grove	5:3f93dd1d4cb3	122	#define ETHARP_FLAG_STATIC_ENTRY 4
sam_grove	5:3f93dd1d4cb3	123
sam_grove	5:3f93dd1d4cb3	124	#if LWIP_NETIF_HWADDRHINT
sam_grove	5:3f93dd1d4cb3	125	#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
sam_grove	5:3f93dd1d4cb3	126	*((netif)->addr_hint) = (hint);
sam_grove	5:3f93dd1d4cb3	127	#else /* LWIP_NETIF_HWADDRHINT */
sam_grove	5:3f93dd1d4cb3	128	#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
sam_grove	5:3f93dd1d4cb3	129	#endif /* LWIP_NETIF_HWADDRHINT */
sam_grove	5:3f93dd1d4cb3	130
sam_grove	5:3f93dd1d4cb3	131	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
sam_grove	5:3f93dd1d4cb3	132
sam_grove	5:3f93dd1d4cb3	133
sam_grove	5:3f93dd1d4cb3	134	/* Some checks, instead of etharp_init(): */
sam_grove	5:3f93dd1d4cb3	135	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
sam_grove	5:3f93dd1d4cb3	136	#error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
sam_grove	5:3f93dd1d4cb3	137	#endif
sam_grove	5:3f93dd1d4cb3	138
sam_grove	5:3f93dd1d4cb3	139
sam_grove	5:3f93dd1d4cb3	140	#if ARP_QUEUEING
sam_grove	5:3f93dd1d4cb3	141	/**
sam_grove	5:3f93dd1d4cb3	142	* Free a complete queue of etharp entries
sam_grove	5:3f93dd1d4cb3	143	*
sam_grove	5:3f93dd1d4cb3	144	* @param q a qeueue of etharp_q_entry's to free
sam_grove	5:3f93dd1d4cb3	145	*/
sam_grove	5:3f93dd1d4cb3	146	static void
sam_grove	5:3f93dd1d4cb3	147	free_etharp_q(struct etharp_q_entry *q)
sam_grove	5:3f93dd1d4cb3	148	{
sam_grove	5:3f93dd1d4cb3	149	struct etharp_q_entry *r;
sam_grove	5:3f93dd1d4cb3	150	LWIP_ASSERT("q != NULL", q != NULL);
sam_grove	5:3f93dd1d4cb3	151	LWIP_ASSERT("q->p != NULL", q->p != NULL);
sam_grove	5:3f93dd1d4cb3	152	while (q) {
sam_grove	5:3f93dd1d4cb3	153	r = q;
sam_grove	5:3f93dd1d4cb3	154	q = q->next;
sam_grove	5:3f93dd1d4cb3	155	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
sam_grove	5:3f93dd1d4cb3	156	pbuf_free(r->p);
sam_grove	5:3f93dd1d4cb3	157	memp_free(MEMP_ARP_QUEUE, r);
sam_grove	5:3f93dd1d4cb3	158	}
sam_grove	5:3f93dd1d4cb3	159	}
sam_grove	5:3f93dd1d4cb3	160	#else /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	161
sam_grove	5:3f93dd1d4cb3	162	/** Compatibility define: free the queued pbuf */
sam_grove	5:3f93dd1d4cb3	163	#define free_etharp_q(q) pbuf_free(q)
sam_grove	5:3f93dd1d4cb3	164
sam_grove	5:3f93dd1d4cb3	165	#endif /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	166
sam_grove	5:3f93dd1d4cb3	167	/** Clean up ARP table entries */
sam_grove	5:3f93dd1d4cb3	168	static void
sam_grove	5:3f93dd1d4cb3	169	free_entry(int i)
sam_grove	5:3f93dd1d4cb3	170	{
sam_grove	5:3f93dd1d4cb3	171	/* remove from SNMP ARP index tree */
sam_grove	5:3f93dd1d4cb3	172	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
sam_grove	5:3f93dd1d4cb3	173	/* and empty packet queue */
sam_grove	5:3f93dd1d4cb3	174	if (arp_table[i].q != NULL) {
sam_grove	5:3f93dd1d4cb3	175	/* remove all queued packets */
sam_grove	5:3f93dd1d4cb3	176	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
sam_grove	5:3f93dd1d4cb3	177	free_etharp_q(arp_table[i].q);
sam_grove	5:3f93dd1d4cb3	178	arp_table[i].q = NULL;
sam_grove	5:3f93dd1d4cb3	179	}
sam_grove	5:3f93dd1d4cb3	180	/* recycle entry for re-use */
sam_grove	5:3f93dd1d4cb3	181	arp_table[i].state = ETHARP_STATE_EMPTY;
sam_grove	5:3f93dd1d4cb3	182	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	183	arp_table[i].static_entry = 0;
sam_grove	5:3f93dd1d4cb3	184	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	185	#ifdef LWIP_DEBUG
sam_grove	5:3f93dd1d4cb3	186	/* for debugging, clean out the complete entry */
sam_grove	5:3f93dd1d4cb3	187	arp_table[i].ctime = 0;
sam_grove	5:3f93dd1d4cb3	188	#if LWIP_SNMP
sam_grove	5:3f93dd1d4cb3	189	arp_table[i].netif = NULL;
sam_grove	5:3f93dd1d4cb3	190	#endif /* LWIP_SNMP */
sam_grove	5:3f93dd1d4cb3	191	ip_addr_set_zero(&arp_table[i].ipaddr);
sam_grove	5:3f93dd1d4cb3	192	arp_table[i].ethaddr = ethzero;
sam_grove	5:3f93dd1d4cb3	193	#endif /* LWIP_DEBUG */
sam_grove	5:3f93dd1d4cb3	194	}
sam_grove	5:3f93dd1d4cb3	195
sam_grove	5:3f93dd1d4cb3	196	/**
sam_grove	5:3f93dd1d4cb3	197	* Clears expired entries in the ARP table.
sam_grove	5:3f93dd1d4cb3	198	*
sam_grove	5:3f93dd1d4cb3	199	* This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
sam_grove	5:3f93dd1d4cb3	200	* in order to expire entries in the ARP table.
sam_grove	5:3f93dd1d4cb3	201	*/
sam_grove	5:3f93dd1d4cb3	202	void
sam_grove	5:3f93dd1d4cb3	203	etharp_tmr(void)
sam_grove	5:3f93dd1d4cb3	204	{
sam_grove	5:3f93dd1d4cb3	205	u8_t i;
sam_grove	5:3f93dd1d4cb3	206
sam_grove	5:3f93dd1d4cb3	207	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
sam_grove	5:3f93dd1d4cb3	208	/* remove expired entries from the ARP table */
sam_grove	5:3f93dd1d4cb3	209	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
sam_grove	5:3f93dd1d4cb3	210	u8_t state = arp_table[i].state;
sam_grove	5:3f93dd1d4cb3	211	if (state != ETHARP_STATE_EMPTY
sam_grove	5:3f93dd1d4cb3	212	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	213	&& (arp_table[i].static_entry == 0)
sam_grove	5:3f93dd1d4cb3	214	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	215	) {
sam_grove	5:3f93dd1d4cb3	216	arp_table[i].ctime++;
sam_grove	5:3f93dd1d4cb3	217	if ((arp_table[i].ctime >= ARP_MAXAGE) \|\|
sam_grove	5:3f93dd1d4cb3	218	((arp_table[i].state == ETHARP_STATE_PENDING) &&
sam_grove	5:3f93dd1d4cb3	219	(arp_table[i].ctime >= ARP_MAXPENDING))) {
sam_grove	5:3f93dd1d4cb3	220	/* pending or stable entry has become old! */
sam_grove	5:3f93dd1d4cb3	221	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
sam_grove	5:3f93dd1d4cb3	222	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
sam_grove	5:3f93dd1d4cb3	223	/* clean up entries that have just been expired */
sam_grove	5:3f93dd1d4cb3	224	free_entry(i);
sam_grove	5:3f93dd1d4cb3	225	}
sam_grove	5:3f93dd1d4cb3	226	#if ARP_QUEUEING
sam_grove	5:3f93dd1d4cb3	227	/* still pending entry? (not expired) */
sam_grove	5:3f93dd1d4cb3	228	if (arp_table[i].state == ETHARP_STATE_PENDING) {
sam_grove	5:3f93dd1d4cb3	229	/* resend an ARP query here? */
sam_grove	5:3f93dd1d4cb3	230	}
sam_grove	5:3f93dd1d4cb3	231	#endif /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	232	}
sam_grove	5:3f93dd1d4cb3	233	}
sam_grove	5:3f93dd1d4cb3	234	}
sam_grove	5:3f93dd1d4cb3	235
sam_grove	5:3f93dd1d4cb3	236	/**
sam_grove	5:3f93dd1d4cb3	237	* Search the ARP table for a matching or new entry.
sam_grove	5:3f93dd1d4cb3	238	*
sam_grove	5:3f93dd1d4cb3	239	* If an IP address is given, return a pending or stable ARP entry that matches
sam_grove	5:3f93dd1d4cb3	240	* the address. If no match is found, create a new entry with this address set,
sam_grove	5:3f93dd1d4cb3	241	* but in state ETHARP_EMPTY. The caller must check and possibly change the
sam_grove	5:3f93dd1d4cb3	242	* state of the returned entry.
sam_grove	5:3f93dd1d4cb3	243	*
sam_grove	5:3f93dd1d4cb3	244	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
sam_grove	5:3f93dd1d4cb3	245	*
sam_grove	5:3f93dd1d4cb3	246	* In all cases, attempt to create new entries from an empty entry. If no
sam_grove	5:3f93dd1d4cb3	247	* empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
sam_grove	5:3f93dd1d4cb3	248	* old entries. Heuristic choose the least important entry for recycling.
sam_grove	5:3f93dd1d4cb3	249	*
sam_grove	5:3f93dd1d4cb3	250	* @param ipaddr IP address to find in ARP cache, or to add if not found.
sam_grove	5:3f93dd1d4cb3	251	* @param flags @see definition of ETHARP_FLAG_*
sam_grove	5:3f93dd1d4cb3	252	* @param netif netif related to this address (used for NETIF_HWADDRHINT)
sam_grove	5:3f93dd1d4cb3	253	*
sam_grove	5:3f93dd1d4cb3	254	* @return The ARP entry index that matched or is created, ERR_MEM if no
sam_grove	5:3f93dd1d4cb3	255	* entry is found or could be recycled.
sam_grove	5:3f93dd1d4cb3	256	*/
sam_grove	5:3f93dd1d4cb3	257	static s8_t
sam_grove	5:3f93dd1d4cb3	258	find_entry(ip_addr_t *ipaddr, u8_t flags)
sam_grove	5:3f93dd1d4cb3	259	{
sam_grove	5:3f93dd1d4cb3	260	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
sam_grove	5:3f93dd1d4cb3	261	s8_t empty = ARP_TABLE_SIZE;
sam_grove	5:3f93dd1d4cb3	262	u8_t i = 0, age_pending = 0, age_stable = 0;
sam_grove	5:3f93dd1d4cb3	263	/* oldest entry with packets on queue */
sam_grove	5:3f93dd1d4cb3	264	s8_t old_queue = ARP_TABLE_SIZE;
sam_grove	5:3f93dd1d4cb3	265	/* its age */
sam_grove	5:3f93dd1d4cb3	266	u8_t age_queue = 0;
sam_grove	5:3f93dd1d4cb3	267
sam_grove	5:3f93dd1d4cb3	268	/**
sam_grove	5:3f93dd1d4cb3	269	* a) do a search through the cache, remember candidates
sam_grove	5:3f93dd1d4cb3	270	* b) select candidate entry
sam_grove	5:3f93dd1d4cb3	271	* c) create new entry
sam_grove	5:3f93dd1d4cb3	272	*/
sam_grove	5:3f93dd1d4cb3	273
sam_grove	5:3f93dd1d4cb3	274	/* a) in a single search sweep, do all of this
sam_grove	5:3f93dd1d4cb3	275	* 1) remember the first empty entry (if any)
sam_grove	5:3f93dd1d4cb3	276	* 2) remember the oldest stable entry (if any)
sam_grove	5:3f93dd1d4cb3	277	* 3) remember the oldest pending entry without queued packets (if any)
sam_grove	5:3f93dd1d4cb3	278	* 4) remember the oldest pending entry with queued packets (if any)
sam_grove	5:3f93dd1d4cb3	279	* 5) search for a matching IP entry, either pending or stable
sam_grove	5:3f93dd1d4cb3	280	* until 5 matches, or all entries are searched for.
sam_grove	5:3f93dd1d4cb3	281	*/
sam_grove	5:3f93dd1d4cb3	282
sam_grove	5:3f93dd1d4cb3	283	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
sam_grove	5:3f93dd1d4cb3	284	u8_t state = arp_table[i].state;
sam_grove	5:3f93dd1d4cb3	285	/* no empty entry found yet and now we do find one? */
sam_grove	5:3f93dd1d4cb3	286	if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
sam_grove	5:3f93dd1d4cb3	287	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
sam_grove	5:3f93dd1d4cb3	288	/* remember first empty entry */
sam_grove	5:3f93dd1d4cb3	289	empty = i;
sam_grove	5:3f93dd1d4cb3	290	} else if (state != ETHARP_STATE_EMPTY) {
sam_grove	5:3f93dd1d4cb3	291	LWIP_ASSERT("state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE",
sam_grove	5:3f93dd1d4cb3	292	state == ETHARP_STATE_PENDING \|\| state == ETHARP_STATE_STABLE);
sam_grove	5:3f93dd1d4cb3	293	/* if given, does IP address match IP address in ARP entry? */
sam_grove	5:3f93dd1d4cb3	294	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
sam_grove	5:3f93dd1d4cb3	295	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
sam_grove	5:3f93dd1d4cb3	296	/* found exact IP address match, simply bail out */
sam_grove	5:3f93dd1d4cb3	297	return i;
sam_grove	5:3f93dd1d4cb3	298	}
sam_grove	5:3f93dd1d4cb3	299	/* pending entry? */
sam_grove	5:3f93dd1d4cb3	300	if (state == ETHARP_STATE_PENDING) {
sam_grove	5:3f93dd1d4cb3	301	/* pending with queued packets? */
sam_grove	5:3f93dd1d4cb3	302	if (arp_table[i].q != NULL) {
sam_grove	5:3f93dd1d4cb3	303	if (arp_table[i].ctime >= age_queue) {
sam_grove	5:3f93dd1d4cb3	304	old_queue = i;
sam_grove	5:3f93dd1d4cb3	305	age_queue = arp_table[i].ctime;
sam_grove	5:3f93dd1d4cb3	306	}
sam_grove	5:3f93dd1d4cb3	307	} else
sam_grove	5:3f93dd1d4cb3	308	/* pending without queued packets? */
sam_grove	5:3f93dd1d4cb3	309	{
sam_grove	5:3f93dd1d4cb3	310	if (arp_table[i].ctime >= age_pending) {
sam_grove	5:3f93dd1d4cb3	311	old_pending = i;
sam_grove	5:3f93dd1d4cb3	312	age_pending = arp_table[i].ctime;
sam_grove	5:3f93dd1d4cb3	313	}
sam_grove	5:3f93dd1d4cb3	314	}
sam_grove	5:3f93dd1d4cb3	315	/* stable entry? */
sam_grove	5:3f93dd1d4cb3	316	} else if (state == ETHARP_STATE_STABLE) {
sam_grove	5:3f93dd1d4cb3	317	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	318	/* don't record old_stable for static entries since they never expire */
sam_grove	5:3f93dd1d4cb3	319	if (arp_table[i].static_entry == 0)
sam_grove	5:3f93dd1d4cb3	320	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	321	{
sam_grove	5:3f93dd1d4cb3	322	/* remember entry with oldest stable entry in oldest, its age in maxtime */
sam_grove	5:3f93dd1d4cb3	323	if (arp_table[i].ctime >= age_stable) {
sam_grove	5:3f93dd1d4cb3	324	old_stable = i;
sam_grove	5:3f93dd1d4cb3	325	age_stable = arp_table[i].ctime;
sam_grove	5:3f93dd1d4cb3	326	}
sam_grove	5:3f93dd1d4cb3	327	}
sam_grove	5:3f93dd1d4cb3	328	}
sam_grove	5:3f93dd1d4cb3	329	}
sam_grove	5:3f93dd1d4cb3	330	}
sam_grove	5:3f93dd1d4cb3	331	/* { we have no match } => try to create a new entry */
sam_grove	5:3f93dd1d4cb3	332
sam_grove	5:3f93dd1d4cb3	333	/* don't create new entry, only search? */
sam_grove	5:3f93dd1d4cb3	334	if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) \|\|
sam_grove	5:3f93dd1d4cb3	335	/* or no empty entry found and not allowed to recycle? */
sam_grove	5:3f93dd1d4cb3	336	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
sam_grove	5:3f93dd1d4cb3	337	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
sam_grove	5:3f93dd1d4cb3	338	return (s8_t)ERR_MEM;
sam_grove	5:3f93dd1d4cb3	339	}
sam_grove	5:3f93dd1d4cb3	340
sam_grove	5:3f93dd1d4cb3	341	/* b) choose the least destructive entry to recycle:
sam_grove	5:3f93dd1d4cb3	342	* 1) empty entry
sam_grove	5:3f93dd1d4cb3	343	* 2) oldest stable entry
sam_grove	5:3f93dd1d4cb3	344	* 3) oldest pending entry without queued packets
sam_grove	5:3f93dd1d4cb3	345	* 4) oldest pending entry with queued packets
sam_grove	5:3f93dd1d4cb3	346	*
sam_grove	5:3f93dd1d4cb3	347	* { ETHARP_FLAG_TRY_HARD is set at this point }
sam_grove	5:3f93dd1d4cb3	348	*/
sam_grove	5:3f93dd1d4cb3	349
sam_grove	5:3f93dd1d4cb3	350	/* 1) empty entry available? */
sam_grove	5:3f93dd1d4cb3	351	if (empty < ARP_TABLE_SIZE) {
sam_grove	5:3f93dd1d4cb3	352	i = empty;
sam_grove	5:3f93dd1d4cb3	353	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
sam_grove	5:3f93dd1d4cb3	354	} else {
sam_grove	5:3f93dd1d4cb3	355	/* 2) found recyclable stable entry? */
sam_grove	5:3f93dd1d4cb3	356	if (old_stable < ARP_TABLE_SIZE) {
sam_grove	5:3f93dd1d4cb3	357	/* recycle oldest stable*/
sam_grove	5:3f93dd1d4cb3	358	i = old_stable;
sam_grove	5:3f93dd1d4cb3	359	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
sam_grove	5:3f93dd1d4cb3	360	/* no queued packets should exist on stable entries */
sam_grove	5:3f93dd1d4cb3	361	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
sam_grove	5:3f93dd1d4cb3	362	/* 3) found recyclable pending entry without queued packets? */
sam_grove	5:3f93dd1d4cb3	363	} else if (old_pending < ARP_TABLE_SIZE) {
sam_grove	5:3f93dd1d4cb3	364	/* recycle oldest pending */
sam_grove	5:3f93dd1d4cb3	365	i = old_pending;
sam_grove	5:3f93dd1d4cb3	366	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
sam_grove	5:3f93dd1d4cb3	367	/* 4) found recyclable pending entry with queued packets? */
sam_grove	5:3f93dd1d4cb3	368	} else if (old_queue < ARP_TABLE_SIZE) {
sam_grove	5:3f93dd1d4cb3	369	/* recycle oldest pending (queued packets are free in free_entry) */
sam_grove	5:3f93dd1d4cb3	370	i = old_queue;
sam_grove	5:3f93dd1d4cb3	371	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)));
sam_grove	5:3f93dd1d4cb3	372	/* no empty or recyclable entries found */
sam_grove	5:3f93dd1d4cb3	373	} else {
sam_grove	5:3f93dd1d4cb3	374	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
sam_grove	5:3f93dd1d4cb3	375	return (s8_t)ERR_MEM;
sam_grove	5:3f93dd1d4cb3	376	}
sam_grove	5:3f93dd1d4cb3	377
sam_grove	5:3f93dd1d4cb3	378	/* { empty or recyclable entry found } */
sam_grove	5:3f93dd1d4cb3	379	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
sam_grove	5:3f93dd1d4cb3	380	free_entry(i);
sam_grove	5:3f93dd1d4cb3	381	}
sam_grove	5:3f93dd1d4cb3	382
sam_grove	5:3f93dd1d4cb3	383	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
sam_grove	5:3f93dd1d4cb3	384	LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
sam_grove	5:3f93dd1d4cb3	385	arp_table[i].state == ETHARP_STATE_EMPTY);
sam_grove	5:3f93dd1d4cb3	386
sam_grove	5:3f93dd1d4cb3	387	/* IP address given? */
sam_grove	5:3f93dd1d4cb3	388	if (ipaddr != NULL) {
sam_grove	5:3f93dd1d4cb3	389	/* set IP address */
sam_grove	5:3f93dd1d4cb3	390	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
sam_grove	5:3f93dd1d4cb3	391	}
sam_grove	5:3f93dd1d4cb3	392	arp_table[i].ctime = 0;
sam_grove	5:3f93dd1d4cb3	393	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	394	arp_table[i].static_entry = 0;
sam_grove	5:3f93dd1d4cb3	395	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	396	return (err_t)i;
sam_grove	5:3f93dd1d4cb3	397	}
sam_grove	5:3f93dd1d4cb3	398
sam_grove	5:3f93dd1d4cb3	399	/**
sam_grove	5:3f93dd1d4cb3	400	* Send an IP packet on the network using netif->linkoutput
sam_grove	5:3f93dd1d4cb3	401	* The ethernet header is filled in before sending.
sam_grove	5:3f93dd1d4cb3	402	*
sam_grove	5:3f93dd1d4cb3	403	* @params netif the lwIP network interface on which to send the packet
sam_grove	5:3f93dd1d4cb3	404	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
sam_grove	5:3f93dd1d4cb3	405	* @params src the source MAC address to be copied into the ethernet header
sam_grove	5:3f93dd1d4cb3	406	* @params dst the destination MAC address to be copied into the ethernet header
sam_grove	5:3f93dd1d4cb3	407	* @return ERR_OK if the packet was sent, any other err_t on failure
sam_grove	5:3f93dd1d4cb3	408	*/
sam_grove	5:3f93dd1d4cb3	409	static err_t
sam_grove	5:3f93dd1d4cb3	410	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
sam_grove	5:3f93dd1d4cb3	411	{
sam_grove	5:3f93dd1d4cb3	412	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
sam_grove	5:3f93dd1d4cb3	413
sam_grove	5:3f93dd1d4cb3	414	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
sam_grove	5:3f93dd1d4cb3	415	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
sam_grove	5:3f93dd1d4cb3	416	ETHADDR32_COPY(&ethhdr->dest, dst);
sam_grove	5:3f93dd1d4cb3	417	ETHADDR16_COPY(&ethhdr->src, src);
sam_grove	5:3f93dd1d4cb3	418	ethhdr->type = PP_HTONS(ETHTYPE_IP);
sam_grove	5:3f93dd1d4cb3	419	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
sam_grove	5:3f93dd1d4cb3	420	/* send the packet */
sam_grove	5:3f93dd1d4cb3	421	return netif->linkoutput(netif, p);
sam_grove	5:3f93dd1d4cb3	422	}
sam_grove	5:3f93dd1d4cb3	423
sam_grove	5:3f93dd1d4cb3	424	/**
sam_grove	5:3f93dd1d4cb3	425	* Update (or insert) a IP/MAC address pair in the ARP cache.
sam_grove	5:3f93dd1d4cb3	426	*
sam_grove	5:3f93dd1d4cb3	427	* If a pending entry is resolved, any queued packets will be sent
sam_grove	5:3f93dd1d4cb3	428	* at this point.
sam_grove	5:3f93dd1d4cb3	429	*
sam_grove	5:3f93dd1d4cb3	430	* @param netif netif related to this entry (used for NETIF_ADDRHINT)
sam_grove	5:3f93dd1d4cb3	431	* @param ipaddr IP address of the inserted ARP entry.
sam_grove	5:3f93dd1d4cb3	432	* @param ethaddr Ethernet address of the inserted ARP entry.
sam_grove	5:3f93dd1d4cb3	433	* @param flags @see definition of ETHARP_FLAG_*
sam_grove	5:3f93dd1d4cb3	434	*
sam_grove	5:3f93dd1d4cb3	435	* @return
sam_grove	5:3f93dd1d4cb3	436	* - ERR_OK Succesfully updated ARP cache.
sam_grove	5:3f93dd1d4cb3	437	* - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
sam_grove	5:3f93dd1d4cb3	438	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
sam_grove	5:3f93dd1d4cb3	439	*
sam_grove	5:3f93dd1d4cb3	440	* @see pbuf_free()
sam_grove	5:3f93dd1d4cb3	441	*/
sam_grove	5:3f93dd1d4cb3	442	static err_t
sam_grove	5:3f93dd1d4cb3	443	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
sam_grove	5:3f93dd1d4cb3	444	{
sam_grove	5:3f93dd1d4cb3	445	s8_t i;
sam_grove	5:3f93dd1d4cb3	446	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
sam_grove	5:3f93dd1d4cb3	447	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",
sam_grove	5:3f93dd1d4cb3	448	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
sam_grove	5:3f93dd1d4cb3	449	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
sam_grove	5:3f93dd1d4cb3	450	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
sam_grove	5:3f93dd1d4cb3	451	/* non-unicast address? */
sam_grove	5:3f93dd1d4cb3	452	if (ip_addr_isany(ipaddr) \|\|
sam_grove	5:3f93dd1d4cb3	453	ip_addr_isbroadcast(ipaddr, netif) \|\|
sam_grove	5:3f93dd1d4cb3	454	ip_addr_ismulticast(ipaddr)) {
sam_grove	5:3f93dd1d4cb3	455	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
sam_grove	5:3f93dd1d4cb3	456	return ERR_ARG;
sam_grove	5:3f93dd1d4cb3	457	}
sam_grove	5:3f93dd1d4cb3	458	/* find or create ARP entry */
sam_grove	5:3f93dd1d4cb3	459	i = find_entry(ipaddr, flags);
sam_grove	5:3f93dd1d4cb3	460	/* bail out if no entry could be found */
sam_grove	5:3f93dd1d4cb3	461	if (i < 0) {
sam_grove	5:3f93dd1d4cb3	462	return (err_t)i;
sam_grove	5:3f93dd1d4cb3	463	}
sam_grove	5:3f93dd1d4cb3	464
sam_grove	5:3f93dd1d4cb3	465	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	466	if (flags & ETHARP_FLAG_STATIC_ENTRY) {
sam_grove	5:3f93dd1d4cb3	467	/* record static type */
sam_grove	5:3f93dd1d4cb3	468	arp_table[i].static_entry = 1;
sam_grove	5:3f93dd1d4cb3	469	}
sam_grove	5:3f93dd1d4cb3	470	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	471
sam_grove	5:3f93dd1d4cb3	472	/* mark it stable */
sam_grove	5:3f93dd1d4cb3	473	arp_table[i].state = ETHARP_STATE_STABLE;
sam_grove	5:3f93dd1d4cb3	474
sam_grove	5:3f93dd1d4cb3	475	#if LWIP_SNMP
sam_grove	5:3f93dd1d4cb3	476	/* record network interface */
sam_grove	5:3f93dd1d4cb3	477	arp_table[i].netif = netif;
sam_grove	5:3f93dd1d4cb3	478	#endif /* LWIP_SNMP */
sam_grove	5:3f93dd1d4cb3	479	/* insert in SNMP ARP index tree */
sam_grove	5:3f93dd1d4cb3	480	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
sam_grove	5:3f93dd1d4cb3	481
sam_grove	5:3f93dd1d4cb3	482	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
sam_grove	5:3f93dd1d4cb3	483	/* update address */
sam_grove	5:3f93dd1d4cb3	484	ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
sam_grove	5:3f93dd1d4cb3	485	/* reset time stamp */
sam_grove	5:3f93dd1d4cb3	486	arp_table[i].ctime = 0;
sam_grove	5:3f93dd1d4cb3	487	/* this is where we will send out queued packets! */
sam_grove	5:3f93dd1d4cb3	488	#if ARP_QUEUEING
sam_grove	5:3f93dd1d4cb3	489	while (arp_table[i].q != NULL) {
sam_grove	5:3f93dd1d4cb3	490	struct pbuf *p;
sam_grove	5:3f93dd1d4cb3	491	/* remember remainder of queue */
sam_grove	5:3f93dd1d4cb3	492	struct etharp_q_entry *q = arp_table[i].q;
sam_grove	5:3f93dd1d4cb3	493	/* pop first item off the queue */
sam_grove	5:3f93dd1d4cb3	494	arp_table[i].q = q->next;
sam_grove	5:3f93dd1d4cb3	495	/* get the packet pointer */
sam_grove	5:3f93dd1d4cb3	496	p = q->p;
sam_grove	5:3f93dd1d4cb3	497	/* now queue entry can be freed */
sam_grove	5:3f93dd1d4cb3	498	memp_free(MEMP_ARP_QUEUE, q);
sam_grove	5:3f93dd1d4cb3	499	#else /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	500	if (arp_table[i].q != NULL) {
sam_grove	5:3f93dd1d4cb3	501	struct pbuf *p = arp_table[i].q;
sam_grove	5:3f93dd1d4cb3	502	arp_table[i].q = NULL;
sam_grove	5:3f93dd1d4cb3	503	#endif /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	504	/* send the queued IP packet */
sam_grove	5:3f93dd1d4cb3	505	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
sam_grove	5:3f93dd1d4cb3	506	/* free the queued IP packet */
sam_grove	5:3f93dd1d4cb3	507	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	508	}
sam_grove	5:3f93dd1d4cb3	509	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	510	}
sam_grove	5:3f93dd1d4cb3	511
sam_grove	5:3f93dd1d4cb3	512	#if ETHARP_SUPPORT_STATIC_ENTRIES
sam_grove	5:3f93dd1d4cb3	513	/** Add a new static entry to the ARP table. If an entry exists for the
sam_grove	5:3f93dd1d4cb3	514	* specified IP address, this entry is overwritten.
sam_grove	5:3f93dd1d4cb3	515	* If packets are queued for the specified IP address, they are sent out.
sam_grove	5:3f93dd1d4cb3	516	*
sam_grove	5:3f93dd1d4cb3	517	* @param ipaddr IP address for the new static entry
sam_grove	5:3f93dd1d4cb3	518	* @param ethaddr ethernet address for the new static entry
sam_grove	5:3f93dd1d4cb3	519	* @return @see return values of etharp_add_static_entry
sam_grove	5:3f93dd1d4cb3	520	*/
sam_grove	5:3f93dd1d4cb3	521	err_t
sam_grove	5:3f93dd1d4cb3	522	etharp_add_static_entry(ip_addr_t ipaddr, struct eth_addr ethaddr)
sam_grove	5:3f93dd1d4cb3	523	{
sam_grove	5:3f93dd1d4cb3	524	struct netif *netif;
sam_grove	5:3f93dd1d4cb3	525	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",
sam_grove	5:3f93dd1d4cb3	526	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
sam_grove	5:3f93dd1d4cb3	527	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
sam_grove	5:3f93dd1d4cb3	528	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
sam_grove	5:3f93dd1d4cb3	529
sam_grove	5:3f93dd1d4cb3	530	netif = ip_route(ipaddr);
sam_grove	5:3f93dd1d4cb3	531	if (netif == NULL) {
sam_grove	5:3f93dd1d4cb3	532	return ERR_RTE;
sam_grove	5:3f93dd1d4cb3	533	}
sam_grove	5:3f93dd1d4cb3	534
sam_grove	5:3f93dd1d4cb3	535	return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD \| ETHARP_FLAG_STATIC_ENTRY);
sam_grove	5:3f93dd1d4cb3	536	}
sam_grove	5:3f93dd1d4cb3	537
sam_grove	5:3f93dd1d4cb3	538	/** Remove a static entry from the ARP table previously added with a call to
sam_grove	5:3f93dd1d4cb3	539	* etharp_add_static_entry.
sam_grove	5:3f93dd1d4cb3	540	*
sam_grove	5:3f93dd1d4cb3	541	* @param ipaddr IP address of the static entry to remove
sam_grove	5:3f93dd1d4cb3	542	* @return ERR_OK: entry removed
sam_grove	5:3f93dd1d4cb3	543	* ERR_MEM: entry wasn't found
sam_grove	5:3f93dd1d4cb3	544	* ERR_ARG: entry wasn't a static entry but a dynamic one
sam_grove	5:3f93dd1d4cb3	545	*/
sam_grove	5:3f93dd1d4cb3	546	err_t
sam_grove	5:3f93dd1d4cb3	547	etharp_remove_static_entry(ip_addr_t *ipaddr)
sam_grove	5:3f93dd1d4cb3	548	{
sam_grove	5:3f93dd1d4cb3	549	s8_t i;
sam_grove	5:3f93dd1d4cb3	550	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
sam_grove	5:3f93dd1d4cb3	551	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
sam_grove	5:3f93dd1d4cb3	552
sam_grove	5:3f93dd1d4cb3	553	/* find or create ARP entry */
sam_grove	5:3f93dd1d4cb3	554	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
sam_grove	5:3f93dd1d4cb3	555	/* bail out if no entry could be found */
sam_grove	5:3f93dd1d4cb3	556	if (i < 0) {
sam_grove	5:3f93dd1d4cb3	557	return (err_t)i;
sam_grove	5:3f93dd1d4cb3	558	}
sam_grove	5:3f93dd1d4cb3	559
sam_grove	5:3f93dd1d4cb3	560	if ((arp_table[i].state != ETHARP_STATE_STABLE) \|\|
sam_grove	5:3f93dd1d4cb3	561	(arp_table[i].static_entry == 0)) {
sam_grove	5:3f93dd1d4cb3	562	/* entry wasn't a static entry, cannot remove it */
sam_grove	5:3f93dd1d4cb3	563	return ERR_ARG;
sam_grove	5:3f93dd1d4cb3	564	}
sam_grove	5:3f93dd1d4cb3	565	/* entry found, free it */
sam_grove	5:3f93dd1d4cb3	566	free_entry(i);
sam_grove	5:3f93dd1d4cb3	567	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	568	}
sam_grove	5:3f93dd1d4cb3	569	#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
sam_grove	5:3f93dd1d4cb3	570
sam_grove	5:3f93dd1d4cb3	571	/**
sam_grove	5:3f93dd1d4cb3	572	* Finds (stable) ethernet/IP address pair from ARP table
sam_grove	5:3f93dd1d4cb3	573	* using interface and IP address index.
sam_grove	5:3f93dd1d4cb3	574	* @note the addresses in the ARP table are in network order!
sam_grove	5:3f93dd1d4cb3	575	*
sam_grove	5:3f93dd1d4cb3	576	* @param netif points to interface index
sam_grove	5:3f93dd1d4cb3	577	* @param ipaddr points to the (network order) IP address index
sam_grove	5:3f93dd1d4cb3	578	* @param eth_ret points to return pointer
sam_grove	5:3f93dd1d4cb3	579	* @param ip_ret points to return pointer
sam_grove	5:3f93dd1d4cb3	580	* @return table index if found, -1 otherwise
sam_grove	5:3f93dd1d4cb3	581	*/
sam_grove	5:3f93dd1d4cb3	582	s8_t
sam_grove	5:3f93dd1d4cb3	583	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
sam_grove	5:3f93dd1d4cb3	584	struct eth_addr eth_ret, ip_addr_t ip_ret)
sam_grove	5:3f93dd1d4cb3	585	{
sam_grove	5:3f93dd1d4cb3	586	s8_t i;
sam_grove	5:3f93dd1d4cb3	587
sam_grove	5:3f93dd1d4cb3	588	LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
sam_grove	5:3f93dd1d4cb3	589	eth_ret != NULL && ip_ret != NULL);
sam_grove	5:3f93dd1d4cb3	590
sam_grove	5:3f93dd1d4cb3	591	LWIP_UNUSED_ARG(netif);
sam_grove	5:3f93dd1d4cb3	592
sam_grove	5:3f93dd1d4cb3	593	i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
sam_grove	5:3f93dd1d4cb3	594	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
sam_grove	5:3f93dd1d4cb3	595	*eth_ret = &arp_table[i].ethaddr;
sam_grove	5:3f93dd1d4cb3	596	*ip_ret = &arp_table[i].ipaddr;
sam_grove	5:3f93dd1d4cb3	597	return i;
sam_grove	5:3f93dd1d4cb3	598	}
sam_grove	5:3f93dd1d4cb3	599	return -1;
sam_grove	5:3f93dd1d4cb3	600	}
sam_grove	5:3f93dd1d4cb3	601
sam_grove	5:3f93dd1d4cb3	602	#if ETHARP_TRUST_IP_MAC
sam_grove	5:3f93dd1d4cb3	603	/**
sam_grove	5:3f93dd1d4cb3	604	* Updates the ARP table using the given IP packet.
sam_grove	5:3f93dd1d4cb3	605	*
sam_grove	5:3f93dd1d4cb3	606	* Uses the incoming IP packet's source address to update the
sam_grove	5:3f93dd1d4cb3	607	* ARP cache for the local network. The function does not alter
sam_grove	5:3f93dd1d4cb3	608	* or free the packet. This function must be called before the
sam_grove	5:3f93dd1d4cb3	609	* packet p is passed to the IP layer.
sam_grove	5:3f93dd1d4cb3	610	*
sam_grove	5:3f93dd1d4cb3	611	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
sam_grove	5:3f93dd1d4cb3	612	* @param p The IP packet that arrived on netif.
sam_grove	5:3f93dd1d4cb3	613	*
sam_grove	5:3f93dd1d4cb3	614	* @return NULL
sam_grove	5:3f93dd1d4cb3	615	*
sam_grove	5:3f93dd1d4cb3	616	* @see pbuf_free()
sam_grove	5:3f93dd1d4cb3	617	*/
sam_grove	5:3f93dd1d4cb3	618	static void
sam_grove	5:3f93dd1d4cb3	619	etharp_ip_input(struct netif netif, struct pbuf p)
sam_grove	5:3f93dd1d4cb3	620	{
sam_grove	5:3f93dd1d4cb3	621	struct eth_hdr *ethhdr;
sam_grove	5:3f93dd1d4cb3	622	struct ip_hdr *iphdr;
sam_grove	5:3f93dd1d4cb3	623	ip_addr_t iphdr_src;
sam_grove	5:3f93dd1d4cb3	624	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
sam_grove	5:3f93dd1d4cb3	625
sam_grove	5:3f93dd1d4cb3	626	/* Only insert an entry if the source IP address of the
sam_grove	5:3f93dd1d4cb3	627	incoming IP packet comes from a host on the local network. */
sam_grove	5:3f93dd1d4cb3	628	ethhdr = (struct eth_hdr *)p->payload;
sam_grove	5:3f93dd1d4cb3	629	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
sam_grove	5:3f93dd1d4cb3	630	#if ETHARP_SUPPORT_VLAN
sam_grove	5:3f93dd1d4cb3	631	if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
sam_grove	5:3f93dd1d4cb3	632	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
sam_grove	5:3f93dd1d4cb3	633	}
sam_grove	5:3f93dd1d4cb3	634	#endif /* ETHARP_SUPPORT_VLAN */
sam_grove	5:3f93dd1d4cb3	635
sam_grove	5:3f93dd1d4cb3	636	ip_addr_copy(iphdr_src, iphdr->src);
sam_grove	5:3f93dd1d4cb3	637
sam_grove	5:3f93dd1d4cb3	638	/* source is not on the local network? */
sam_grove	5:3f93dd1d4cb3	639	if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
sam_grove	5:3f93dd1d4cb3	640	/* do nothing */
sam_grove	5:3f93dd1d4cb3	641	return;
sam_grove	5:3f93dd1d4cb3	642	}
sam_grove	5:3f93dd1d4cb3	643
sam_grove	5:3f93dd1d4cb3	644	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
sam_grove	5:3f93dd1d4cb3	645	/* update the source IP address in the cache, if present */
sam_grove	5:3f93dd1d4cb3	646	/* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
sam_grove	5:3f93dd1d4cb3	647	* back soon (for example, if the destination IP address is ours. */
sam_grove	5:3f93dd1d4cb3	648	update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
sam_grove	5:3f93dd1d4cb3	649	}
sam_grove	5:3f93dd1d4cb3	650	#endif /* ETHARP_TRUST_IP_MAC */
sam_grove	5:3f93dd1d4cb3	651
sam_grove	5:3f93dd1d4cb3	652	/**
sam_grove	5:3f93dd1d4cb3	653	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
sam_grove	5:3f93dd1d4cb3	654	* send out queued IP packets. Updates cache with snooped address pairs.
sam_grove	5:3f93dd1d4cb3	655	*
sam_grove	5:3f93dd1d4cb3	656	* Should be called for incoming ARP packets. The pbuf in the argument
sam_grove	5:3f93dd1d4cb3	657	* is freed by this function.
sam_grove	5:3f93dd1d4cb3	658	*
sam_grove	5:3f93dd1d4cb3	659	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
sam_grove	5:3f93dd1d4cb3	660	* @param ethaddr Ethernet address of netif.
sam_grove	5:3f93dd1d4cb3	661	* @param p The ARP packet that arrived on netif. Is freed by this function.
sam_grove	5:3f93dd1d4cb3	662	*
sam_grove	5:3f93dd1d4cb3	663	* @return NULL
sam_grove	5:3f93dd1d4cb3	664	*
sam_grove	5:3f93dd1d4cb3	665	* @see pbuf_free()
sam_grove	5:3f93dd1d4cb3	666	*/
sam_grove	5:3f93dd1d4cb3	667	static void
sam_grove	5:3f93dd1d4cb3	668	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
sam_grove	5:3f93dd1d4cb3	669	{
sam_grove	5:3f93dd1d4cb3	670	struct etharp_hdr *hdr;
sam_grove	5:3f93dd1d4cb3	671	struct eth_hdr *ethhdr;
sam_grove	5:3f93dd1d4cb3	672	/* these are aligned properly, whereas the ARP header fields might not be */
sam_grove	5:3f93dd1d4cb3	673	ip_addr_t sipaddr, dipaddr;
sam_grove	5:3f93dd1d4cb3	674	u8_t for_us;
sam_grove	5:3f93dd1d4cb3	675	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	676	const u8_t * ethdst_hwaddr;
sam_grove	5:3f93dd1d4cb3	677	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	678
sam_grove	5:3f93dd1d4cb3	679	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
sam_grove	5:3f93dd1d4cb3	680
sam_grove	5:3f93dd1d4cb3	681	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
sam_grove	5:3f93dd1d4cb3	682	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
sam_grove	5:3f93dd1d4cb3	683	if (p->len < SIZEOF_ETHARP_PACKET) {
sam_grove	5:3f93dd1d4cb3	684	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
sam_grove	5:3f93dd1d4cb3	685	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
sam_grove	5:3f93dd1d4cb3	686	(s16_t)SIZEOF_ETHARP_PACKET));
sam_grove	5:3f93dd1d4cb3	687	ETHARP_STATS_INC(etharp.lenerr);
sam_grove	5:3f93dd1d4cb3	688	ETHARP_STATS_INC(etharp.drop);
sam_grove	5:3f93dd1d4cb3	689	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	690	return;
sam_grove	5:3f93dd1d4cb3	691	}
sam_grove	5:3f93dd1d4cb3	692
sam_grove	5:3f93dd1d4cb3	693	ethhdr = (struct eth_hdr *)p->payload;
sam_grove	5:3f93dd1d4cb3	694	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
sam_grove	5:3f93dd1d4cb3	695	#if ETHARP_SUPPORT_VLAN
sam_grove	5:3f93dd1d4cb3	696	if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
sam_grove	5:3f93dd1d4cb3	697	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
sam_grove	5:3f93dd1d4cb3	698	}
sam_grove	5:3f93dd1d4cb3	699	#endif /* ETHARP_SUPPORT_VLAN */
sam_grove	5:3f93dd1d4cb3	700
sam_grove	5:3f93dd1d4cb3	701	/* RFC 826 "Packet Reception": */
sam_grove	5:3f93dd1d4cb3	702	if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) \|\|
sam_grove	5:3f93dd1d4cb3	703	(hdr->hwlen != ETHARP_HWADDR_LEN) \|\|
sam_grove	5:3f93dd1d4cb3	704	(hdr->protolen != sizeof(ip_addr_t)) \|\|
sam_grove	5:3f93dd1d4cb3	705	(hdr->proto != PP_HTONS(ETHTYPE_IP))) {
sam_grove	5:3f93dd1d4cb3	706	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
sam_grove	5:3f93dd1d4cb3	707	("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
sam_grove	5:3f93dd1d4cb3	708	hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen));
sam_grove	5:3f93dd1d4cb3	709	ETHARP_STATS_INC(etharp.proterr);
sam_grove	5:3f93dd1d4cb3	710	ETHARP_STATS_INC(etharp.drop);
sam_grove	5:3f93dd1d4cb3	711	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	712	return;
sam_grove	5:3f93dd1d4cb3	713	}
sam_grove	5:3f93dd1d4cb3	714	ETHARP_STATS_INC(etharp.recv);
sam_grove	5:3f93dd1d4cb3	715
sam_grove	5:3f93dd1d4cb3	716	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	717	/* We have to check if a host already has configured our random
sam_grove	5:3f93dd1d4cb3	718	* created link local address and continously check if there is
sam_grove	5:3f93dd1d4cb3	719	* a host with this IP-address so we can detect collisions */
sam_grove	5:3f93dd1d4cb3	720	autoip_arp_reply(netif, hdr);
sam_grove	5:3f93dd1d4cb3	721	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	722
sam_grove	5:3f93dd1d4cb3	723	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
sam_grove	5:3f93dd1d4cb3	724	* structure packing (not using structure copy which breaks strict-aliasing rules). */
sam_grove	5:3f93dd1d4cb3	725	IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
sam_grove	5:3f93dd1d4cb3	726	IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
sam_grove	5:3f93dd1d4cb3	727
sam_grove	5:3f93dd1d4cb3	728	/* this interface is not configured? */
sam_grove	5:3f93dd1d4cb3	729	if (ip_addr_isany(&netif->ip_addr)) {
sam_grove	5:3f93dd1d4cb3	730	for_us = 0;
sam_grove	5:3f93dd1d4cb3	731	} else {
sam_grove	5:3f93dd1d4cb3	732	/* ARP packet directed to us? */
sam_grove	5:3f93dd1d4cb3	733	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
sam_grove	5:3f93dd1d4cb3	734	}
sam_grove	5:3f93dd1d4cb3	735
sam_grove	5:3f93dd1d4cb3	736	/* ARP message directed to us?
sam_grove	5:3f93dd1d4cb3	737	-> add IP address in ARP cache; assume requester wants to talk to us,
sam_grove	5:3f93dd1d4cb3	738	can result in directly sending the queued packets for this host.
sam_grove	5:3f93dd1d4cb3	739	ARP message not directed to us?
sam_grove	5:3f93dd1d4cb3	740	-> update the source IP address in the cache, if present */
sam_grove	5:3f93dd1d4cb3	741	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
sam_grove	5:3f93dd1d4cb3	742	for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
sam_grove	5:3f93dd1d4cb3	743
sam_grove	5:3f93dd1d4cb3	744	/* now act on the message itself */
sam_grove	5:3f93dd1d4cb3	745	switch (hdr->opcode) {
sam_grove	5:3f93dd1d4cb3	746	/* ARP request? */
sam_grove	5:3f93dd1d4cb3	747	case PP_HTONS(ARP_REQUEST):
sam_grove	5:3f93dd1d4cb3	748	/* ARP request. If it asked for our address, we send out a
sam_grove	5:3f93dd1d4cb3	749	* reply. In any case, we time-stamp any existing ARP entry,
sam_grove	5:3f93dd1d4cb3	750	* and possiby send out an IP packet that was queued on it. */
sam_grove	5:3f93dd1d4cb3	751
sam_grove	5:3f93dd1d4cb3	752	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
sam_grove	5:3f93dd1d4cb3	753	/* ARP request for our address? */
sam_grove	5:3f93dd1d4cb3	754	if (for_us) {
sam_grove	5:3f93dd1d4cb3	755
sam_grove	5:3f93dd1d4cb3	756	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
sam_grove	5:3f93dd1d4cb3	757	/* Re-use pbuf to send ARP reply.
sam_grove	5:3f93dd1d4cb3	758	Since we are re-using an existing pbuf, we can't call etharp_raw since
sam_grove	5:3f93dd1d4cb3	759	that would allocate a new pbuf. */
sam_grove	5:3f93dd1d4cb3	760	hdr->opcode = htons(ARP_REPLY);
sam_grove	5:3f93dd1d4cb3	761
sam_grove	5:3f93dd1d4cb3	762	IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
sam_grove	5:3f93dd1d4cb3	763	IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
sam_grove	5:3f93dd1d4cb3	764
sam_grove	5:3f93dd1d4cb3	765	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
sam_grove	5:3f93dd1d4cb3	766	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
sam_grove	5:3f93dd1d4cb3	767	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	768	/* If we are using Link-Local, all ARP packets that contain a Link-Local
sam_grove	5:3f93dd1d4cb3	769	* 'sender IP address' MUST be sent using link-layer broadcast instead of
sam_grove	5:3f93dd1d4cb3	770	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
sam_grove	5:3f93dd1d4cb3	771	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
sam_grove	5:3f93dd1d4cb3	772	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	773
sam_grove	5:3f93dd1d4cb3	774	ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
sam_grove	5:3f93dd1d4cb3	775	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	776	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
sam_grove	5:3f93dd1d4cb3	777	#else /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	778	ETHADDR16_COPY(&ethhdr->dest, &hdr->shwaddr);
sam_grove	5:3f93dd1d4cb3	779	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	780	ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
sam_grove	5:3f93dd1d4cb3	781	ETHADDR16_COPY(&ethhdr->src, ethaddr);
sam_grove	5:3f93dd1d4cb3	782
sam_grove	5:3f93dd1d4cb3	783	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
sam_grove	5:3f93dd1d4cb3	784	are already correct, we tested that before */
sam_grove	5:3f93dd1d4cb3	785
sam_grove	5:3f93dd1d4cb3	786	/* return ARP reply */
sam_grove	5:3f93dd1d4cb3	787	netif->linkoutput(netif, p);
sam_grove	5:3f93dd1d4cb3	788	/* we are not configured? */
sam_grove	5:3f93dd1d4cb3	789	} else if (ip_addr_isany(&netif->ip_addr)) {
sam_grove	5:3f93dd1d4cb3	790	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
sam_grove	5:3f93dd1d4cb3	791	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
sam_grove	5:3f93dd1d4cb3	792	/* request was not directed to us */
sam_grove	5:3f93dd1d4cb3	793	} else {
sam_grove	5:3f93dd1d4cb3	794	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
sam_grove	5:3f93dd1d4cb3	795	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
sam_grove	5:3f93dd1d4cb3	796	}
sam_grove	5:3f93dd1d4cb3	797	break;
sam_grove	5:3f93dd1d4cb3	798	case PP_HTONS(ARP_REPLY):
sam_grove	5:3f93dd1d4cb3	799	/* ARP reply. We already updated the ARP cache earlier. */
sam_grove	5:3f93dd1d4cb3	800	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
sam_grove	5:3f93dd1d4cb3	801	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
sam_grove	5:3f93dd1d4cb3	802	/* DHCP wants to know about ARP replies from any host with an
sam_grove	5:3f93dd1d4cb3	803	* IP address also offered to us by the DHCP server. We do not
sam_grove	5:3f93dd1d4cb3	804	* want to take a duplicate IP address on a single network.
sam_grove	5:3f93dd1d4cb3	805	* @todo How should we handle redundant (fail-over) interfaces? */
sam_grove	5:3f93dd1d4cb3	806	dhcp_arp_reply(netif, &sipaddr);
sam_grove	5:3f93dd1d4cb3	807	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
sam_grove	5:3f93dd1d4cb3	808	break;
sam_grove	5:3f93dd1d4cb3	809	default:
sam_grove	5:3f93dd1d4cb3	810	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
sam_grove	5:3f93dd1d4cb3	811	ETHARP_STATS_INC(etharp.err);
sam_grove	5:3f93dd1d4cb3	812	break;
sam_grove	5:3f93dd1d4cb3	813	}
sam_grove	5:3f93dd1d4cb3	814	/* free ARP packet */
sam_grove	5:3f93dd1d4cb3	815	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	816	}
sam_grove	5:3f93dd1d4cb3	817
sam_grove	5:3f93dd1d4cb3	818	/**
sam_grove	5:3f93dd1d4cb3	819	* Resolve and fill-in Ethernet address header for outgoing IP packet.
sam_grove	5:3f93dd1d4cb3	820	*
sam_grove	5:3f93dd1d4cb3	821	* For IP multicast and broadcast, corresponding Ethernet addresses
sam_grove	5:3f93dd1d4cb3	822	* are selected and the packet is transmitted on the link.
sam_grove	5:3f93dd1d4cb3	823	*
sam_grove	5:3f93dd1d4cb3	824	* For unicast addresses, the packet is submitted to etharp_query(). In
sam_grove	5:3f93dd1d4cb3	825	* case the IP address is outside the local network, the IP address of
sam_grove	5:3f93dd1d4cb3	826	* the gateway is used.
sam_grove	5:3f93dd1d4cb3	827	*
sam_grove	5:3f93dd1d4cb3	828	* @param netif The lwIP network interface which the IP packet will be sent on.
sam_grove	5:3f93dd1d4cb3	829	* @param q The pbuf(s) containing the IP packet to be sent.
sam_grove	5:3f93dd1d4cb3	830	* @param ipaddr The IP address of the packet destination.
sam_grove	5:3f93dd1d4cb3	831	*
sam_grove	5:3f93dd1d4cb3	832	* @return
sam_grove	5:3f93dd1d4cb3	833	* - ERR_RTE No route to destination (no gateway to external networks),
sam_grove	5:3f93dd1d4cb3	834	* or the return type of either etharp_query() or etharp_send_ip().
sam_grove	5:3f93dd1d4cb3	835	*/
sam_grove	5:3f93dd1d4cb3	836	err_t
sam_grove	5:3f93dd1d4cb3	837	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
sam_grove	5:3f93dd1d4cb3	838	{
sam_grove	5:3f93dd1d4cb3	839	struct eth_addr *dest, mcastaddr;
sam_grove	5:3f93dd1d4cb3	840
sam_grove	5:3f93dd1d4cb3	841	/* make room for Ethernet header - should not fail */
sam_grove	5:3f93dd1d4cb3	842	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
sam_grove	5:3f93dd1d4cb3	843	/* bail out */
sam_grove	5:3f93dd1d4cb3	844	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
sam_grove	5:3f93dd1d4cb3	845	("etharp_output: could not allocate room for header.\n"));
sam_grove	5:3f93dd1d4cb3	846	LINK_STATS_INC(link.lenerr);
sam_grove	5:3f93dd1d4cb3	847	return ERR_BUF;
sam_grove	5:3f93dd1d4cb3	848	}
sam_grove	5:3f93dd1d4cb3	849
sam_grove	5:3f93dd1d4cb3	850	/* assume unresolved Ethernet address */
sam_grove	5:3f93dd1d4cb3	851	dest = NULL;
sam_grove	5:3f93dd1d4cb3	852	/* Determine on destination hardware address. Broadcasts and multicasts
sam_grove	5:3f93dd1d4cb3	853	* are special, other IP addresses are looked up in the ARP table. */
sam_grove	5:3f93dd1d4cb3	854
sam_grove	5:3f93dd1d4cb3	855	/* broadcast destination IP address? */
sam_grove	5:3f93dd1d4cb3	856	if (ip_addr_isbroadcast(ipaddr, netif)) {
sam_grove	5:3f93dd1d4cb3	857	/* broadcast on Ethernet also */
sam_grove	5:3f93dd1d4cb3	858	dest = (struct eth_addr *)&ethbroadcast;
sam_grove	5:3f93dd1d4cb3	859	/* multicast destination IP address? */
sam_grove	5:3f93dd1d4cb3	860	} else if (ip_addr_ismulticast(ipaddr)) {
sam_grove	5:3f93dd1d4cb3	861	/* Hash IP multicast address to MAC address.*/
sam_grove	5:3f93dd1d4cb3	862	mcastaddr.addr[0] = 0x01;
sam_grove	5:3f93dd1d4cb3	863	mcastaddr.addr[1] = 0x00;
sam_grove	5:3f93dd1d4cb3	864	mcastaddr.addr[2] = 0x5e;
sam_grove	5:3f93dd1d4cb3	865	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
sam_grove	5:3f93dd1d4cb3	866	mcastaddr.addr[4] = ip4_addr3(ipaddr);
sam_grove	5:3f93dd1d4cb3	867	mcastaddr.addr[5] = ip4_addr4(ipaddr);
sam_grove	5:3f93dd1d4cb3	868	/* destination Ethernet address is multicast */
sam_grove	5:3f93dd1d4cb3	869	dest = &mcastaddr;
sam_grove	5:3f93dd1d4cb3	870	/* unicast destination IP address? */
sam_grove	5:3f93dd1d4cb3	871	} else {
sam_grove	5:3f93dd1d4cb3	872	/* outside local network? */
sam_grove	5:3f93dd1d4cb3	873	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
sam_grove	5:3f93dd1d4cb3	874	!ip_addr_islinklocal(ipaddr)) {
sam_grove	5:3f93dd1d4cb3	875	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	876	struct ip_hdr iphdr = (struct ip_hdr)((u8_t*)q->payload +
sam_grove	5:3f93dd1d4cb3	877	sizeof(struct eth_hdr));
sam_grove	5:3f93dd1d4cb3	878	/* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
sam_grove	5:3f93dd1d4cb3	879	a link-local source address must always be "directly to its destination
sam_grove	5:3f93dd1d4cb3	880	on the same physical link. The host MUST NOT send the packet to any
sam_grove	5:3f93dd1d4cb3	881	router for forwarding". */
sam_grove	5:3f93dd1d4cb3	882	if (!ip_addr_islinklocal(&iphdr->src))
sam_grove	5:3f93dd1d4cb3	883	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	884	{
sam_grove	5:3f93dd1d4cb3	885	/* interface has default gateway? */
sam_grove	5:3f93dd1d4cb3	886	if (!ip_addr_isany(&netif->gw)) {
sam_grove	5:3f93dd1d4cb3	887	/* send to hardware address of default gateway IP address */
sam_grove	5:3f93dd1d4cb3	888	ipaddr = &(netif->gw);
sam_grove	5:3f93dd1d4cb3	889	/* no default gateway available */
sam_grove	5:3f93dd1d4cb3	890	} else {
sam_grove	5:3f93dd1d4cb3	891	/* no route to destination error (default gateway missing) */
sam_grove	5:3f93dd1d4cb3	892	return ERR_RTE;
sam_grove	5:3f93dd1d4cb3	893	}
sam_grove	5:3f93dd1d4cb3	894	}
sam_grove	5:3f93dd1d4cb3	895	}
sam_grove	5:3f93dd1d4cb3	896	#if LWIP_NETIF_HWADDRHINT
sam_grove	5:3f93dd1d4cb3	897	if (netif->addr_hint != NULL) {
sam_grove	5:3f93dd1d4cb3	898	/* per-pcb cached entry was given */
sam_grove	5:3f93dd1d4cb3	899	u8_t etharp_cached_entry = *(netif->addr_hint);
sam_grove	5:3f93dd1d4cb3	900	if (etharp_cached_entry < ARP_TABLE_SIZE) {
sam_grove	5:3f93dd1d4cb3	901	#endif /* LWIP_NETIF_HWADDRHINT */
sam_grove	5:3f93dd1d4cb3	902	if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
sam_grove	5:3f93dd1d4cb3	903	(ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
sam_grove	5:3f93dd1d4cb3	904	/* the per-pcb-cached entry is stable and the right one! */
sam_grove	5:3f93dd1d4cb3	905	ETHARP_STATS_INC(etharp.cachehit);
sam_grove	5:3f93dd1d4cb3	906	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
sam_grove	5:3f93dd1d4cb3	907	&arp_table[etharp_cached_entry].ethaddr);
sam_grove	5:3f93dd1d4cb3	908	}
sam_grove	5:3f93dd1d4cb3	909	#if LWIP_NETIF_HWADDRHINT
sam_grove	5:3f93dd1d4cb3	910	}
sam_grove	5:3f93dd1d4cb3	911	}
sam_grove	5:3f93dd1d4cb3	912	#endif /* LWIP_NETIF_HWADDRHINT */
sam_grove	5:3f93dd1d4cb3	913	/* queue on destination Ethernet address belonging to ipaddr */
sam_grove	5:3f93dd1d4cb3	914	return etharp_query(netif, ipaddr, q);
sam_grove	5:3f93dd1d4cb3	915	}
sam_grove	5:3f93dd1d4cb3	916
sam_grove	5:3f93dd1d4cb3	917	/* continuation for multicast/broadcast destinations */
sam_grove	5:3f93dd1d4cb3	918	/* obtain source Ethernet address of the given interface */
sam_grove	5:3f93dd1d4cb3	919	/* send packet directly on the link */
sam_grove	5:3f93dd1d4cb3	920	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
sam_grove	5:3f93dd1d4cb3	921	}
sam_grove	5:3f93dd1d4cb3	922
sam_grove	5:3f93dd1d4cb3	923	/**
sam_grove	5:3f93dd1d4cb3	924	* Send an ARP request for the given IP address and/or queue a packet.
sam_grove	5:3f93dd1d4cb3	925	*
sam_grove	5:3f93dd1d4cb3	926	* If the IP address was not yet in the cache, a pending ARP cache entry
sam_grove	5:3f93dd1d4cb3	927	* is added and an ARP request is sent for the given address. The packet
sam_grove	5:3f93dd1d4cb3	928	* is queued on this entry.
sam_grove	5:3f93dd1d4cb3	929	*
sam_grove	5:3f93dd1d4cb3	930	* If the IP address was already pending in the cache, a new ARP request
sam_grove	5:3f93dd1d4cb3	931	* is sent for the given address. The packet is queued on this entry.
sam_grove	5:3f93dd1d4cb3	932	*
sam_grove	5:3f93dd1d4cb3	933	* If the IP address was already stable in the cache, and a packet is
sam_grove	5:3f93dd1d4cb3	934	* given, it is directly sent and no ARP request is sent out.
sam_grove	5:3f93dd1d4cb3	935	*
sam_grove	5:3f93dd1d4cb3	936	* If the IP address was already stable in the cache, and no packet is
sam_grove	5:3f93dd1d4cb3	937	* given, an ARP request is sent out.
sam_grove	5:3f93dd1d4cb3	938	*
sam_grove	5:3f93dd1d4cb3	939	* @param netif The lwIP network interface on which ipaddr
sam_grove	5:3f93dd1d4cb3	940	* must be queried for.
sam_grove	5:3f93dd1d4cb3	941	* @param ipaddr The IP address to be resolved.
sam_grove	5:3f93dd1d4cb3	942	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
sam_grove	5:3f93dd1d4cb3	943	* q is not freed by this function.
sam_grove	5:3f93dd1d4cb3	944	*
sam_grove	5:3f93dd1d4cb3	945	* @note q must only be ONE packet, not a packet queue!
sam_grove	5:3f93dd1d4cb3	946	*
sam_grove	5:3f93dd1d4cb3	947	* @return
sam_grove	5:3f93dd1d4cb3	948	* - ERR_BUF Could not make room for Ethernet header.
sam_grove	5:3f93dd1d4cb3	949	* - ERR_MEM Hardware address unknown, and no more ARP entries available
sam_grove	5:3f93dd1d4cb3	950	* to query for address or queue the packet.
sam_grove	5:3f93dd1d4cb3	951	* - ERR_MEM Could not queue packet due to memory shortage.
sam_grove	5:3f93dd1d4cb3	952	* - ERR_RTE No route to destination (no gateway to external networks).
sam_grove	5:3f93dd1d4cb3	953	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
sam_grove	5:3f93dd1d4cb3	954	*
sam_grove	5:3f93dd1d4cb3	955	*/
sam_grove	5:3f93dd1d4cb3	956	err_t
sam_grove	5:3f93dd1d4cb3	957	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
sam_grove	5:3f93dd1d4cb3	958	{
sam_grove	5:3f93dd1d4cb3	959	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
sam_grove	5:3f93dd1d4cb3	960	err_t result = ERR_MEM;
sam_grove	5:3f93dd1d4cb3	961	s8_t i; /* ARP entry index */
sam_grove	5:3f93dd1d4cb3	962
sam_grove	5:3f93dd1d4cb3	963	/* non-unicast address? */
sam_grove	5:3f93dd1d4cb3	964	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
sam_grove	5:3f93dd1d4cb3	965	ip_addr_ismulticast(ipaddr) \|\|
sam_grove	5:3f93dd1d4cb3	966	ip_addr_isany(ipaddr)) {
sam_grove	5:3f93dd1d4cb3	967	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
sam_grove	5:3f93dd1d4cb3	968	return ERR_ARG;
sam_grove	5:3f93dd1d4cb3	969	}
sam_grove	5:3f93dd1d4cb3	970
sam_grove	5:3f93dd1d4cb3	971	/* find entry in ARP cache, ask to create entry if queueing packet */
sam_grove	5:3f93dd1d4cb3	972	i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
sam_grove	5:3f93dd1d4cb3	973
sam_grove	5:3f93dd1d4cb3	974	/* could not find or create entry? */
sam_grove	5:3f93dd1d4cb3	975	if (i < 0) {
sam_grove	5:3f93dd1d4cb3	976	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
sam_grove	5:3f93dd1d4cb3	977	if (q) {
sam_grove	5:3f93dd1d4cb3	978	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
sam_grove	5:3f93dd1d4cb3	979	ETHARP_STATS_INC(etharp.memerr);
sam_grove	5:3f93dd1d4cb3	980	}
sam_grove	5:3f93dd1d4cb3	981	return (err_t)i;
sam_grove	5:3f93dd1d4cb3	982	}
sam_grove	5:3f93dd1d4cb3	983
sam_grove	5:3f93dd1d4cb3	984	/* mark a fresh entry as pending (we just sent a request) */
sam_grove	5:3f93dd1d4cb3	985	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
sam_grove	5:3f93dd1d4cb3	986	arp_table[i].state = ETHARP_STATE_PENDING;
sam_grove	5:3f93dd1d4cb3	987	}
sam_grove	5:3f93dd1d4cb3	988
sam_grove	5:3f93dd1d4cb3	989	/* { i is either a STABLE or (new or existing) PENDING entry } */
sam_grove	5:3f93dd1d4cb3	990	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
sam_grove	5:3f93dd1d4cb3	991	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
sam_grove	5:3f93dd1d4cb3	992	(arp_table[i].state == ETHARP_STATE_STABLE)));
sam_grove	5:3f93dd1d4cb3	993
sam_grove	5:3f93dd1d4cb3	994	/* do we have a pending entry? or an implicit query request? */
sam_grove	5:3f93dd1d4cb3	995	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
sam_grove	5:3f93dd1d4cb3	996	/* try to resolve it; send out ARP request */
sam_grove	5:3f93dd1d4cb3	997	result = etharp_request(netif, ipaddr);
sam_grove	5:3f93dd1d4cb3	998	if (result != ERR_OK) {
sam_grove	5:3f93dd1d4cb3	999	/* ARP request couldn't be sent */
sam_grove	5:3f93dd1d4cb3	1000	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
sam_grove	5:3f93dd1d4cb3	1001	since this failure could be temporary, and the next packet calling
sam_grove	5:3f93dd1d4cb3	1002	etharp_query again could lead to sending the queued packets. */
sam_grove	5:3f93dd1d4cb3	1003	}
sam_grove	5:3f93dd1d4cb3	1004	if (q == NULL) {
sam_grove	5:3f93dd1d4cb3	1005	return result;
sam_grove	5:3f93dd1d4cb3	1006	}
sam_grove	5:3f93dd1d4cb3	1007	}
sam_grove	5:3f93dd1d4cb3	1008
sam_grove	5:3f93dd1d4cb3	1009	/* packet given? */
sam_grove	5:3f93dd1d4cb3	1010	LWIP_ASSERT("q != NULL", q != NULL);
sam_grove	5:3f93dd1d4cb3	1011	/* stable entry? */
sam_grove	5:3f93dd1d4cb3	1012	if (arp_table[i].state == ETHARP_STATE_STABLE) {
sam_grove	5:3f93dd1d4cb3	1013	/* we have a valid IP->Ethernet address mapping */
sam_grove	5:3f93dd1d4cb3	1014	ETHARP_SET_HINT(netif, i);
sam_grove	5:3f93dd1d4cb3	1015	/* send the packet */
sam_grove	5:3f93dd1d4cb3	1016	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
sam_grove	5:3f93dd1d4cb3	1017	/* pending entry? (either just created or already pending */
sam_grove	5:3f93dd1d4cb3	1018	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
sam_grove	5:3f93dd1d4cb3	1019	/* entry is still pending, queue the given packet 'q' */
sam_grove	5:3f93dd1d4cb3	1020	struct pbuf *p;
sam_grove	5:3f93dd1d4cb3	1021	int copy_needed = 0;
sam_grove	5:3f93dd1d4cb3	1022	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
sam_grove	5:3f93dd1d4cb3	1023	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
sam_grove	5:3f93dd1d4cb3	1024	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
sam_grove	5:3f93dd1d4cb3	1025	p = q;
sam_grove	5:3f93dd1d4cb3	1026	while (p) {
sam_grove	5:3f93dd1d4cb3	1027	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
sam_grove	5:3f93dd1d4cb3	1028	if(p->type != PBUF_ROM) {
sam_grove	5:3f93dd1d4cb3	1029	copy_needed = 1;
sam_grove	5:3f93dd1d4cb3	1030	break;
sam_grove	5:3f93dd1d4cb3	1031	}
sam_grove	5:3f93dd1d4cb3	1032	p = p->next;
sam_grove	5:3f93dd1d4cb3	1033	}
sam_grove	5:3f93dd1d4cb3	1034	if(copy_needed) {
sam_grove	5:3f93dd1d4cb3	1035	/* copy the whole packet into new pbufs */
sam_grove	5:3f93dd1d4cb3	1036	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
sam_grove	5:3f93dd1d4cb3	1037	if(p != NULL) {
sam_grove	5:3f93dd1d4cb3	1038	if (pbuf_copy(p, q) != ERR_OK) {
sam_grove	5:3f93dd1d4cb3	1039	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	1040	p = NULL;
sam_grove	5:3f93dd1d4cb3	1041	}
sam_grove	5:3f93dd1d4cb3	1042	}
sam_grove	5:3f93dd1d4cb3	1043	} else {
sam_grove	5:3f93dd1d4cb3	1044	/* referencing the old pbuf is enough */
sam_grove	5:3f93dd1d4cb3	1045	p = q;
sam_grove	5:3f93dd1d4cb3	1046	pbuf_ref(p);
sam_grove	5:3f93dd1d4cb3	1047	}
sam_grove	5:3f93dd1d4cb3	1048	/* packet could be taken over? */
sam_grove	5:3f93dd1d4cb3	1049	if (p != NULL) {
sam_grove	5:3f93dd1d4cb3	1050	/* queue packet ... */
sam_grove	5:3f93dd1d4cb3	1051	#if ARP_QUEUEING
sam_grove	5:3f93dd1d4cb3	1052	struct etharp_q_entry *new_entry;
sam_grove	5:3f93dd1d4cb3	1053	/* allocate a new arp queue entry */
sam_grove	5:3f93dd1d4cb3	1054	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
sam_grove	5:3f93dd1d4cb3	1055	if (new_entry != NULL) {
sam_grove	5:3f93dd1d4cb3	1056	new_entry->next = 0;
sam_grove	5:3f93dd1d4cb3	1057	new_entry->p = p;
sam_grove	5:3f93dd1d4cb3	1058	if(arp_table[i].q != NULL) {
sam_grove	5:3f93dd1d4cb3	1059	/* queue was already existent, append the new entry to the end */
sam_grove	5:3f93dd1d4cb3	1060	struct etharp_q_entry *r;
sam_grove	5:3f93dd1d4cb3	1061	r = arp_table[i].q;
sam_grove	5:3f93dd1d4cb3	1062	while (r->next != NULL) {
sam_grove	5:3f93dd1d4cb3	1063	r = r->next;
sam_grove	5:3f93dd1d4cb3	1064	}
sam_grove	5:3f93dd1d4cb3	1065	r->next = new_entry;
sam_grove	5:3f93dd1d4cb3	1066	} else {
sam_grove	5:3f93dd1d4cb3	1067	/* queue did not exist, first item in queue */
sam_grove	5:3f93dd1d4cb3	1068	arp_table[i].q = new_entry;
sam_grove	5:3f93dd1d4cb3	1069	}
sam_grove	5:3f93dd1d4cb3	1070	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
sam_grove	5:3f93dd1d4cb3	1071	result = ERR_OK;
sam_grove	5:3f93dd1d4cb3	1072	} else {
sam_grove	5:3f93dd1d4cb3	1073	/* the pool MEMP_ARP_QUEUE is empty */
sam_grove	5:3f93dd1d4cb3	1074	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	1075	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));
sam_grove	5:3f93dd1d4cb3	1076	result = ERR_MEM;
sam_grove	5:3f93dd1d4cb3	1077	}
sam_grove	5:3f93dd1d4cb3	1078	#else /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	1079	/* always queue one packet per ARP request only, freeing a previously queued packet */
sam_grove	5:3f93dd1d4cb3	1080	if (arp_table[i].q != NULL) {
sam_grove	5:3f93dd1d4cb3	1081	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: dropped previously queued packet %p for ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
sam_grove	5:3f93dd1d4cb3	1082	pbuf_free(arp_table[i].q);
sam_grove	5:3f93dd1d4cb3	1083	}
sam_grove	5:3f93dd1d4cb3	1084	arp_table[i].q = p;
sam_grove	5:3f93dd1d4cb3	1085	result = ERR_OK;
sam_grove	5:3f93dd1d4cb3	1086	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
sam_grove	5:3f93dd1d4cb3	1087	#endif /* ARP_QUEUEING */
sam_grove	5:3f93dd1d4cb3	1088	} else {
sam_grove	5:3f93dd1d4cb3	1089	ETHARP_STATS_INC(etharp.memerr);
sam_grove	5:3f93dd1d4cb3	1090	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));
sam_grove	5:3f93dd1d4cb3	1091	result = ERR_MEM;
sam_grove	5:3f93dd1d4cb3	1092	}
sam_grove	5:3f93dd1d4cb3	1093	}
sam_grove	5:3f93dd1d4cb3	1094	return result;
sam_grove	5:3f93dd1d4cb3	1095	}
sam_grove	5:3f93dd1d4cb3	1096
sam_grove	5:3f93dd1d4cb3	1097	/**
sam_grove	5:3f93dd1d4cb3	1098	* Send a raw ARP packet (opcode and all addresses can be modified)
sam_grove	5:3f93dd1d4cb3	1099	*
sam_grove	5:3f93dd1d4cb3	1100	* @param netif the lwip network interface on which to send the ARP packet
sam_grove	5:3f93dd1d4cb3	1101	* @param ethsrc_addr the source MAC address for the ethernet header
sam_grove	5:3f93dd1d4cb3	1102	* @param ethdst_addr the destination MAC address for the ethernet header
sam_grove	5:3f93dd1d4cb3	1103	* @param hwsrc_addr the source MAC address for the ARP protocol header
sam_grove	5:3f93dd1d4cb3	1104	* @param ipsrc_addr the source IP address for the ARP protocol header
sam_grove	5:3f93dd1d4cb3	1105	* @param hwdst_addr the destination MAC address for the ARP protocol header
sam_grove	5:3f93dd1d4cb3	1106	* @param ipdst_addr the destination IP address for the ARP protocol header
sam_grove	5:3f93dd1d4cb3	1107	* @param opcode the type of the ARP packet
sam_grove	5:3f93dd1d4cb3	1108	* @return ERR_OK if the ARP packet has been sent
sam_grove	5:3f93dd1d4cb3	1109	* ERR_MEM if the ARP packet couldn't be allocated
sam_grove	5:3f93dd1d4cb3	1110	* any other err_t on failure
sam_grove	5:3f93dd1d4cb3	1111	*/
sam_grove	5:3f93dd1d4cb3	1112	#if !LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	1113	static
sam_grove	5:3f93dd1d4cb3	1114	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	1115	err_t
sam_grove	5:3f93dd1d4cb3	1116	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
sam_grove	5:3f93dd1d4cb3	1117	const struct eth_addr *ethdst_addr,
sam_grove	5:3f93dd1d4cb3	1118	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
sam_grove	5:3f93dd1d4cb3	1119	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
sam_grove	5:3f93dd1d4cb3	1120	const u16_t opcode)
sam_grove	5:3f93dd1d4cb3	1121	{
sam_grove	5:3f93dd1d4cb3	1122	struct pbuf *p;
sam_grove	5:3f93dd1d4cb3	1123	err_t result = ERR_OK;
sam_grove	5:3f93dd1d4cb3	1124	struct eth_hdr *ethhdr;
sam_grove	5:3f93dd1d4cb3	1125	struct etharp_hdr *hdr;
sam_grove	5:3f93dd1d4cb3	1126	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	1127	const u8_t * ethdst_hwaddr;
sam_grove	5:3f93dd1d4cb3	1128	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	1129
sam_grove	5:3f93dd1d4cb3	1130	/* allocate a pbuf for the outgoing ARP request packet */
sam_grove	5:3f93dd1d4cb3	1131	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
sam_grove	5:3f93dd1d4cb3	1132	/* could allocate a pbuf for an ARP request? */
sam_grove	5:3f93dd1d4cb3	1133	if (p == NULL) {
sam_grove	5:3f93dd1d4cb3	1134	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
sam_grove	5:3f93dd1d4cb3	1135	("etharp_raw: could not allocate pbuf for ARP request.\n"));
sam_grove	5:3f93dd1d4cb3	1136	ETHARP_STATS_INC(etharp.memerr);
sam_grove	5:3f93dd1d4cb3	1137	return ERR_MEM;
sam_grove	5:3f93dd1d4cb3	1138	}
sam_grove	5:3f93dd1d4cb3	1139	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
sam_grove	5:3f93dd1d4cb3	1140	(p->len >= SIZEOF_ETHARP_PACKET));
sam_grove	5:3f93dd1d4cb3	1141
sam_grove	5:3f93dd1d4cb3	1142	ethhdr = (struct eth_hdr *)p->payload;
sam_grove	5:3f93dd1d4cb3	1143	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
sam_grove	5:3f93dd1d4cb3	1144	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
sam_grove	5:3f93dd1d4cb3	1145	hdr->opcode = htons(opcode);
sam_grove	5:3f93dd1d4cb3	1146
sam_grove	5:3f93dd1d4cb3	1147	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
sam_grove	5:3f93dd1d4cb3	1148	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
sam_grove	5:3f93dd1d4cb3	1149	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	1150	/* If we are using Link-Local, all ARP packets that contain a Link-Local
sam_grove	5:3f93dd1d4cb3	1151	* 'sender IP address' MUST be sent using link-layer broadcast instead of
sam_grove	5:3f93dd1d4cb3	1152	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
sam_grove	5:3f93dd1d4cb3	1153	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
sam_grove	5:3f93dd1d4cb3	1154	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	1155	/* Write the ARP MAC-Addresses */
sam_grove	5:3f93dd1d4cb3	1156	ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
sam_grove	5:3f93dd1d4cb3	1157	ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
sam_grove	5:3f93dd1d4cb3	1158	/* Write the Ethernet MAC-Addresses */
sam_grove	5:3f93dd1d4cb3	1159	#if LWIP_AUTOIP
sam_grove	5:3f93dd1d4cb3	1160	ETHADDR16_COPY(&ethhdr->dest, ethdst_hwaddr);
sam_grove	5:3f93dd1d4cb3	1161	#else /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	1162	ETHADDR16_COPY(&ethhdr->dest, ethdst_addr);
sam_grove	5:3f93dd1d4cb3	1163	#endif /* LWIP_AUTOIP */
sam_grove	5:3f93dd1d4cb3	1164	ETHADDR16_COPY(&ethhdr->src, ethsrc_addr);
sam_grove	5:3f93dd1d4cb3	1165	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
sam_grove	5:3f93dd1d4cb3	1166	* structure packing. */
sam_grove	5:3f93dd1d4cb3	1167	IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
sam_grove	5:3f93dd1d4cb3	1168	IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
sam_grove	5:3f93dd1d4cb3	1169
sam_grove	5:3f93dd1d4cb3	1170	hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
sam_grove	5:3f93dd1d4cb3	1171	hdr->proto = PP_HTONS(ETHTYPE_IP);
sam_grove	5:3f93dd1d4cb3	1172	/* set hwlen and protolen */
sam_grove	5:3f93dd1d4cb3	1173	hdr->hwlen = ETHARP_HWADDR_LEN;
sam_grove	5:3f93dd1d4cb3	1174	hdr->protolen = sizeof(ip_addr_t);
sam_grove	5:3f93dd1d4cb3	1175
sam_grove	5:3f93dd1d4cb3	1176	ethhdr->type = PP_HTONS(ETHTYPE_ARP);
sam_grove	5:3f93dd1d4cb3	1177	/* send ARP query */
sam_grove	5:3f93dd1d4cb3	1178	result = netif->linkoutput(netif, p);
sam_grove	5:3f93dd1d4cb3	1179	ETHARP_STATS_INC(etharp.xmit);
sam_grove	5:3f93dd1d4cb3	1180	/* free ARP query packet */
sam_grove	5:3f93dd1d4cb3	1181	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	1182	p = NULL;
sam_grove	5:3f93dd1d4cb3	1183	/* could not allocate pbuf for ARP request */
sam_grove	5:3f93dd1d4cb3	1184
sam_grove	5:3f93dd1d4cb3	1185	return result;
sam_grove	5:3f93dd1d4cb3	1186	}
sam_grove	5:3f93dd1d4cb3	1187
sam_grove	5:3f93dd1d4cb3	1188	/**
sam_grove	5:3f93dd1d4cb3	1189	* Send an ARP request packet asking for ipaddr.
sam_grove	5:3f93dd1d4cb3	1190	*
sam_grove	5:3f93dd1d4cb3	1191	* @param netif the lwip network interface on which to send the request
sam_grove	5:3f93dd1d4cb3	1192	* @param ipaddr the IP address for which to ask
sam_grove	5:3f93dd1d4cb3	1193	* @return ERR_OK if the request has been sent
sam_grove	5:3f93dd1d4cb3	1194	* ERR_MEM if the ARP packet couldn't be allocated
sam_grove	5:3f93dd1d4cb3	1195	* any other err_t on failure
sam_grove	5:3f93dd1d4cb3	1196	*/
sam_grove	5:3f93dd1d4cb3	1197	err_t
sam_grove	5:3f93dd1d4cb3	1198	etharp_request(struct netif netif, ip_addr_t ipaddr)
sam_grove	5:3f93dd1d4cb3	1199	{
sam_grove	5:3f93dd1d4cb3	1200	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
sam_grove	5:3f93dd1d4cb3	1201	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
sam_grove	5:3f93dd1d4cb3	1202	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
sam_grove	5:3f93dd1d4cb3	1203	ipaddr, ARP_REQUEST);
sam_grove	5:3f93dd1d4cb3	1204	}
sam_grove	5:3f93dd1d4cb3	1205	#endif /* LWIP_ARP */
sam_grove	5:3f93dd1d4cb3	1206
sam_grove	5:3f93dd1d4cb3	1207	/**
sam_grove	5:3f93dd1d4cb3	1208	* Process received ethernet frames. Using this function instead of directly
sam_grove	5:3f93dd1d4cb3	1209	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
sam_grove	5:3f93dd1d4cb3	1210	* the ARP cache is protected from concurrent access.
sam_grove	5:3f93dd1d4cb3	1211	*
sam_grove	5:3f93dd1d4cb3	1212	* @param p the recevied packet, p->payload pointing to the ethernet header
sam_grove	5:3f93dd1d4cb3	1213	* @param netif the network interface on which the packet was received
sam_grove	5:3f93dd1d4cb3	1214	*/
sam_grove	5:3f93dd1d4cb3	1215	err_t
sam_grove	5:3f93dd1d4cb3	1216	ethernet_input(struct pbuf p, struct netif netif)
sam_grove	5:3f93dd1d4cb3	1217	{
sam_grove	5:3f93dd1d4cb3	1218	struct eth_hdr* ethhdr;
sam_grove	5:3f93dd1d4cb3	1219	u16_t type;
sam_grove	5:3f93dd1d4cb3	1220	s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
sam_grove	5:3f93dd1d4cb3	1221
sam_grove	5:3f93dd1d4cb3	1222	if (p->len <= SIZEOF_ETH_HDR) {
sam_grove	5:3f93dd1d4cb3	1223	/* a packet with only an ethernet header (or less) is not valid for us */
sam_grove	5:3f93dd1d4cb3	1224	ETHARP_STATS_INC(etharp.proterr);
sam_grove	5:3f93dd1d4cb3	1225	ETHARP_STATS_INC(etharp.drop);
sam_grove	5:3f93dd1d4cb3	1226	goto free_and_return;
sam_grove	5:3f93dd1d4cb3	1227	}
sam_grove	5:3f93dd1d4cb3	1228
sam_grove	5:3f93dd1d4cb3	1229	/* points to packet payload, which starts with an Ethernet header */
sam_grove	5:3f93dd1d4cb3	1230	ethhdr = (struct eth_hdr *)p->payload;
sam_grove	5:3f93dd1d4cb3	1231	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
sam_grove	5:3f93dd1d4cb3	1232	("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",
sam_grove	5:3f93dd1d4cb3	1233	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
sam_grove	5:3f93dd1d4cb3	1234	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
sam_grove	5:3f93dd1d4cb3	1235	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
sam_grove	5:3f93dd1d4cb3	1236	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
sam_grove	5:3f93dd1d4cb3	1237	(unsigned)htons(ethhdr->type)));
sam_grove	5:3f93dd1d4cb3	1238
sam_grove	5:3f93dd1d4cb3	1239	type = ethhdr->type;
sam_grove	5:3f93dd1d4cb3	1240	#if ETHARP_SUPPORT_VLAN
sam_grove	5:3f93dd1d4cb3	1241	if (type == PP_HTONS(ETHTYPE_VLAN)) {
sam_grove	5:3f93dd1d4cb3	1242	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
sam_grove	5:3f93dd1d4cb3	1243	if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
sam_grove	5:3f93dd1d4cb3	1244	/* a packet with only an ethernet/vlan header (or less) is not valid for us */
sam_grove	5:3f93dd1d4cb3	1245	ETHARP_STATS_INC(etharp.proterr);
sam_grove	5:3f93dd1d4cb3	1246	ETHARP_STATS_INC(etharp.drop);
sam_grove	5:3f93dd1d4cb3	1247	goto free_and_return;
sam_grove	5:3f93dd1d4cb3	1248	}
sam_grove	5:3f93dd1d4cb3	1249	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
sam_grove	5:3f93dd1d4cb3	1250	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
sam_grove	5:3f93dd1d4cb3	1251	/* silently ignore this packet: not for our VLAN */
sam_grove	5:3f93dd1d4cb3	1252	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	1253	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	1254	}
sam_grove	5:3f93dd1d4cb3	1255	#endif /* ETHARP_VLAN_CHECK */
sam_grove	5:3f93dd1d4cb3	1256	type = vlan->tpid;
sam_grove	5:3f93dd1d4cb3	1257	ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
sam_grove	5:3f93dd1d4cb3	1258	}
sam_grove	5:3f93dd1d4cb3	1259	#endif /* ETHARP_SUPPORT_VLAN */
sam_grove	5:3f93dd1d4cb3	1260
sam_grove	5:3f93dd1d4cb3	1261	#if LWIP_ARP_FILTER_NETIF
sam_grove	5:3f93dd1d4cb3	1262	netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
sam_grove	5:3f93dd1d4cb3	1263	#endif /* LWIP_ARP_FILTER_NETIF*/
sam_grove	5:3f93dd1d4cb3	1264
sam_grove	5:3f93dd1d4cb3	1265	switch (type) {
sam_grove	5:3f93dd1d4cb3	1266	#if LWIP_ARP
sam_grove	5:3f93dd1d4cb3	1267	/* IP packet? */
sam_grove	5:3f93dd1d4cb3	1268	case PP_HTONS(ETHTYPE_IP):
sam_grove	5:3f93dd1d4cb3	1269	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
sam_grove	5:3f93dd1d4cb3	1270	goto free_and_return;
sam_grove	5:3f93dd1d4cb3	1271	}
sam_grove	5:3f93dd1d4cb3	1272	#if ETHARP_TRUST_IP_MAC
sam_grove	5:3f93dd1d4cb3	1273	/* update ARP table */
sam_grove	5:3f93dd1d4cb3	1274	etharp_ip_input(netif, p);
sam_grove	5:3f93dd1d4cb3	1275	#endif /* ETHARP_TRUST_IP_MAC */
sam_grove	5:3f93dd1d4cb3	1276	/* skip Ethernet header */
sam_grove	5:3f93dd1d4cb3	1277	if(pbuf_header(p, -ip_hdr_offset)) {
sam_grove	5:3f93dd1d4cb3	1278	LWIP_ASSERT("Can't move over header in packet", 0);
sam_grove	5:3f93dd1d4cb3	1279	goto free_and_return;
sam_grove	5:3f93dd1d4cb3	1280	} else {
sam_grove	5:3f93dd1d4cb3	1281	/* pass to IP layer */
sam_grove	5:3f93dd1d4cb3	1282	ip_input(p, netif);
sam_grove	5:3f93dd1d4cb3	1283	}
sam_grove	5:3f93dd1d4cb3	1284	break;
sam_grove	5:3f93dd1d4cb3	1285
sam_grove	5:3f93dd1d4cb3	1286	case PP_HTONS(ETHTYPE_ARP):
sam_grove	5:3f93dd1d4cb3	1287	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
sam_grove	5:3f93dd1d4cb3	1288	goto free_and_return;
sam_grove	5:3f93dd1d4cb3	1289	}
sam_grove	5:3f93dd1d4cb3	1290	/* pass p to ARP module */
sam_grove	5:3f93dd1d4cb3	1291	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
sam_grove	5:3f93dd1d4cb3	1292	break;
sam_grove	5:3f93dd1d4cb3	1293	#endif /* LWIP_ARP */
sam_grove	5:3f93dd1d4cb3	1294	#if PPPOE_SUPPORT
sam_grove	5:3f93dd1d4cb3	1295	case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
sam_grove	5:3f93dd1d4cb3	1296	pppoe_disc_input(netif, p);
sam_grove	5:3f93dd1d4cb3	1297	break;
sam_grove	5:3f93dd1d4cb3	1298
sam_grove	5:3f93dd1d4cb3	1299	case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
sam_grove	5:3f93dd1d4cb3	1300	pppoe_data_input(netif, p);
sam_grove	5:3f93dd1d4cb3	1301	break;
sam_grove	5:3f93dd1d4cb3	1302	#endif /* PPPOE_SUPPORT */
sam_grove	5:3f93dd1d4cb3	1303
sam_grove	5:3f93dd1d4cb3	1304	default:
sam_grove	5:3f93dd1d4cb3	1305	ETHARP_STATS_INC(etharp.proterr);
sam_grove	5:3f93dd1d4cb3	1306	ETHARP_STATS_INC(etharp.drop);
sam_grove	5:3f93dd1d4cb3	1307	goto free_and_return;
sam_grove	5:3f93dd1d4cb3	1308	}
sam_grove	5:3f93dd1d4cb3	1309
sam_grove	5:3f93dd1d4cb3	1310	/* This means the pbuf is freed or consumed,
sam_grove	5:3f93dd1d4cb3	1311	so the caller doesn't have to free it again */
sam_grove	5:3f93dd1d4cb3	1312	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	1313
sam_grove	5:3f93dd1d4cb3	1314	free_and_return:
sam_grove	5:3f93dd1d4cb3	1315	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	1316	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	1317	}
sam_grove	5:3f93dd1d4cb3	1318	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */