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lwip/netif/etharp.c@0:632c9925f013, 2010-06-11 (annotated)

Committer:: donatien
Date:: Fri Jun 11 16:05:15 2010 +0000
Revision:: 0:632c9925f013
Child:: 5:dd63a1e02b1b

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:632c9925f013	1	/**
donatien	0:632c9925f013	2	* @file
donatien	0:632c9925f013	3	* Address Resolution Protocol module for IP over Ethernet
donatien	0:632c9925f013	4	*
donatien	0:632c9925f013	5	* Functionally, ARP is divided into two parts. The first maps an IP address
donatien	0:632c9925f013	6	* to a physical address when sending a packet, and the second part answers
donatien	0:632c9925f013	7	* requests from other machines for our physical address.
donatien	0:632c9925f013	8	*
donatien	0:632c9925f013	9	* This implementation complies with RFC 826 (Ethernet ARP). It supports
donatien	0:632c9925f013	10	* Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
donatien	0:632c9925f013	11	* if an interface calls etharp_gratuitous(our_netif) upon address change.
donatien	0:632c9925f013	12	*/
donatien	0:632c9925f013	13
donatien	0:632c9925f013	14	/*
donatien	0:632c9925f013	15	* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
donatien	0:632c9925f013	16	* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
donatien	0:632c9925f013	17	* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
donatien	0:632c9925f013	18	* All rights reserved.
donatien	0:632c9925f013	19	*
donatien	0:632c9925f013	20	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:632c9925f013	21	* are permitted provided that the following conditions are met:
donatien	0:632c9925f013	22	*
donatien	0:632c9925f013	23	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:632c9925f013	24	* this list of conditions and the following disclaimer.
donatien	0:632c9925f013	25	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:632c9925f013	26	* this list of conditions and the following disclaimer in the documentation
donatien	0:632c9925f013	27	* and/or other materials provided with the distribution.
donatien	0:632c9925f013	28	* 3. The name of the author may not be used to endorse or promote products
donatien	0:632c9925f013	29	* derived from this software without specific prior written permission.
donatien	0:632c9925f013	30	*
donatien	0:632c9925f013	31	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:632c9925f013	32	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:632c9925f013	33	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:632c9925f013	34	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:632c9925f013	35	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:632c9925f013	36	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:632c9925f013	37	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:632c9925f013	38	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:632c9925f013	39	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:632c9925f013	40	* OF SUCH DAMAGE.
donatien	0:632c9925f013	41	*
donatien	0:632c9925f013	42	* This file is part of the lwIP TCP/IP stack.
donatien	0:632c9925f013	43	*
donatien	0:632c9925f013	44	*/
donatien	0:632c9925f013	45
donatien	0:632c9925f013	46	#include "lwip/opt.h"
donatien	0:632c9925f013	47
donatien	0:632c9925f013	48	#if LWIP_ARP \|\| LWIP_ETHERNET
donatien	0:632c9925f013	49
donatien	0:632c9925f013	50	#include "lwip/ip_addr.h"
donatien	0:632c9925f013	51	#include "lwip/def.h"
donatien	0:632c9925f013	52	#include "lwip/ip.h"
donatien	0:632c9925f013	53	#include "lwip/stats.h"
donatien	0:632c9925f013	54	#include "lwip/snmp.h"
donatien	0:632c9925f013	55	#include "lwip/dhcp.h"
donatien	0:632c9925f013	56	#include "lwip/autoip.h"
donatien	0:632c9925f013	57	#include "netif/etharp.h"
donatien	0:632c9925f013	58
donatien	0:632c9925f013	59	#if PPPOE_SUPPORT
donatien	0:632c9925f013	60	#include "netif/ppp_oe.h"
donatien	0:632c9925f013	61	#endif /* PPPOE_SUPPORT */
donatien	0:632c9925f013	62
donatien	0:632c9925f013	63	#include <string.h>
donatien	0:632c9925f013	64
donatien	0:632c9925f013	65	const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
donatien	0:632c9925f013	66	const struct eth_addr ethzero = {{0,0,0,0,0,0}};
donatien	0:632c9925f013	67
donatien	0:632c9925f013	68	#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
donatien	0:632c9925f013	69
donatien	0:632c9925f013	70	/** the time an ARP entry stays valid after its last update,
donatien	0:632c9925f013	71	* for ARP_TMR_INTERVAL = 5000, this is
donatien	0:632c9925f013	72	* (240 * 5) seconds = 20 minutes.
donatien	0:632c9925f013	73	*/
donatien	0:632c9925f013	74	#define ARP_MAXAGE 240
donatien	0:632c9925f013	75	/** the time an ARP entry stays pending after first request,
donatien	0:632c9925f013	76	* for ARP_TMR_INTERVAL = 5000, this is
donatien	0:632c9925f013	77	* (2 * 5) seconds = 10 seconds.
donatien	0:632c9925f013	78	*
donatien	0:632c9925f013	79	* @internal Keep this number at least 2, otherwise it might
donatien	0:632c9925f013	80	* run out instantly if the timeout occurs directly after a request.
donatien	0:632c9925f013	81	*/
donatien	0:632c9925f013	82	#define ARP_MAXPENDING 2
donatien	0:632c9925f013	83
donatien	0:632c9925f013	84	#define HWTYPE_ETHERNET 1
donatien	0:632c9925f013	85
donatien	0:632c9925f013	86	#define ARPH_HWLEN(hdr) (ntohs((hdr)->_hwlen_protolen) >> 8)
donatien	0:632c9925f013	87	#define ARPH_PROTOLEN(hdr) (ntohs((hdr)->_hwlen_protolen) & 0xff)
donatien	0:632c9925f013	88
donatien	0:632c9925f013	89	#define ARPH_HWLEN_SET(hdr, len) (hdr)->_hwlen_protolen = htons(ARPH_PROTOLEN(hdr) \| ((len) << 8))
donatien	0:632c9925f013	90	#define ARPH_PROTOLEN_SET(hdr, len) (hdr)->_hwlen_protolen = htons((len) \| (ARPH_HWLEN(hdr) << 8))
donatien	0:632c9925f013	91
donatien	0:632c9925f013	92	enum etharp_state {
donatien	0:632c9925f013	93	ETHARP_STATE_EMPTY = 0,
donatien	0:632c9925f013	94	ETHARP_STATE_PENDING,
donatien	0:632c9925f013	95	ETHARP_STATE_STABLE
donatien	0:632c9925f013	96	};
donatien	0:632c9925f013	97
donatien	0:632c9925f013	98	struct etharp_entry {
donatien	0:632c9925f013	99	#if ARP_QUEUEING
donatien	0:632c9925f013	100	/**
donatien	0:632c9925f013	101	* Pointer to queue of pending outgoing packets on this ARP entry.
donatien	0:632c9925f013	102	*/
donatien	0:632c9925f013	103	struct etharp_q_entry *q;
donatien	0:632c9925f013	104	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	105	ip_addr_t ipaddr;
donatien	0:632c9925f013	106	struct eth_addr ethaddr;
donatien	0:632c9925f013	107	enum etharp_state state;
donatien	0:632c9925f013	108	u8_t ctime;
donatien	0:632c9925f013	109	struct netif *netif;
donatien	0:632c9925f013	110	};
donatien	0:632c9925f013	111
donatien	0:632c9925f013	112	static struct etharp_entry arp_table[ARP_TABLE_SIZE];
donatien	0:632c9925f013	113	#if !LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	114	static u8_t etharp_cached_entry;
donatien	0:632c9925f013	115	#endif /* !LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	116
donatien	0:632c9925f013	117	/**
donatien	0:632c9925f013	118	* Try hard to create a new entry - we want the IP address to appear in
donatien	0:632c9925f013	119	* the cache (even if this means removing an active entry or so). */
donatien	0:632c9925f013	120	#define ETHARP_TRY_HARD 1
donatien	0:632c9925f013	121	#define ETHARP_FIND_ONLY 2
donatien	0:632c9925f013	122
donatien	0:632c9925f013	123	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	124	#define NETIF_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
donatien	0:632c9925f013	125	*((netif)->addr_hint) = (hint);
donatien	0:632c9925f013	126	static s8_t find_entry(ip_addr_t ipaddr, u8_t flags, struct netif netif);
donatien	0:632c9925f013	127	#else /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	128	static s8_t find_entry(ip_addr_t *ipaddr, u8_t flags);
donatien	0:632c9925f013	129	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	130
donatien	0:632c9925f013	131	static err_t update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags);
donatien	0:632c9925f013	132
donatien	0:632c9925f013	133
donatien	0:632c9925f013	134	/* Some checks, instead of etharp_init(): */
donatien	0:632c9925f013	135	#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
donatien	0:632c9925f013	136	#error "If you want to use ARP, ARP_TABLE_SIZE must fit in an s8_t, so, you have to reduce it in your lwipopts.h"
donatien	0:632c9925f013	137	#endif
donatien	0:632c9925f013	138
donatien	0:632c9925f013	139
donatien	0:632c9925f013	140	#if ARP_QUEUEING
donatien	0:632c9925f013	141	/**
donatien	0:632c9925f013	142	* Free a complete queue of etharp entries
donatien	0:632c9925f013	143	*
donatien	0:632c9925f013	144	* @param q a qeueue of etharp_q_entry's to free
donatien	0:632c9925f013	145	*/
donatien	0:632c9925f013	146	static void
donatien	0:632c9925f013	147	free_etharp_q(struct etharp_q_entry *q)
donatien	0:632c9925f013	148	{
donatien	0:632c9925f013	149	struct etharp_q_entry *r;
donatien	0:632c9925f013	150	LWIP_ASSERT("q != NULL", q != NULL);
donatien	0:632c9925f013	151	LWIP_ASSERT("q->p != NULL", q->p != NULL);
donatien	0:632c9925f013	152	while (q) {
donatien	0:632c9925f013	153	r = q;
donatien	0:632c9925f013	154	q = q->next;
donatien	0:632c9925f013	155	LWIP_ASSERT("r->p != NULL", (r->p != NULL));
donatien	0:632c9925f013	156	pbuf_free(r->p);
donatien	0:632c9925f013	157	memp_free(MEMP_ARP_QUEUE, r);
donatien	0:632c9925f013	158	}
donatien	0:632c9925f013	159	}
donatien	0:632c9925f013	160	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	161
donatien	0:632c9925f013	162	/**
donatien	0:632c9925f013	163	* Clears expired entries in the ARP table.
donatien	0:632c9925f013	164	*
donatien	0:632c9925f013	165	* This function should be called every ETHARP_TMR_INTERVAL microseconds (5 seconds),
donatien	0:632c9925f013	166	* in order to expire entries in the ARP table.
donatien	0:632c9925f013	167	*/
donatien	0:632c9925f013	168	void
donatien	0:632c9925f013	169	etharp_tmr(void)
donatien	0:632c9925f013	170	{
donatien	0:632c9925f013	171	u8_t i;
donatien	0:632c9925f013	172
donatien	0:632c9925f013	173	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
donatien	0:632c9925f013	174	/* remove expired entries from the ARP table */
donatien	0:632c9925f013	175	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
donatien	0:632c9925f013	176	arp_table[i].ctime++;
donatien	0:632c9925f013	177	if (((arp_table[i].state == ETHARP_STATE_STABLE) &&
donatien	0:632c9925f013	178	(arp_table[i].ctime >= ARP_MAXAGE)) \|\|
donatien	0:632c9925f013	179	((arp_table[i].state == ETHARP_STATE_PENDING) &&
donatien	0:632c9925f013	180	(arp_table[i].ctime >= ARP_MAXPENDING))) {
donatien	0:632c9925f013	181	/* pending or stable entry has become old! */
donatien	0:632c9925f013	182	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
donatien	0:632c9925f013	183	arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
donatien	0:632c9925f013	184	/* clean up entries that have just been expired */
donatien	0:632c9925f013	185	/* remove from SNMP ARP index tree */
donatien	0:632c9925f013	186	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
donatien	0:632c9925f013	187	#if ARP_QUEUEING
donatien	0:632c9925f013	188	/* and empty packet queue */
donatien	0:632c9925f013	189	if (arp_table[i].q != NULL) {
donatien	0:632c9925f013	190	/* remove all queued packets */
donatien	0:632c9925f013	191	LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
donatien	0:632c9925f013	192	free_etharp_q(arp_table[i].q);
donatien	0:632c9925f013	193	arp_table[i].q = NULL;
donatien	0:632c9925f013	194	}
donatien	0:632c9925f013	195	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	196	/* recycle entry for re-use */
donatien	0:632c9925f013	197	arp_table[i].state = ETHARP_STATE_EMPTY;
donatien	0:632c9925f013	198	}
donatien	0:632c9925f013	199	#if ARP_QUEUEING
donatien	0:632c9925f013	200	/* still pending entry? (not expired) */
donatien	0:632c9925f013	201	if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	0:632c9925f013	202	/* resend an ARP query here? */
donatien	0:632c9925f013	203	}
donatien	0:632c9925f013	204	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	205	}
donatien	0:632c9925f013	206	}
donatien	0:632c9925f013	207
donatien	0:632c9925f013	208	/**
donatien	0:632c9925f013	209	* Search the ARP table for a matching or new entry.
donatien	0:632c9925f013	210	*
donatien	0:632c9925f013	211	* If an IP address is given, return a pending or stable ARP entry that matches
donatien	0:632c9925f013	212	* the address. If no match is found, create a new entry with this address set,
donatien	0:632c9925f013	213	* but in state ETHARP_EMPTY. The caller must check and possibly change the
donatien	0:632c9925f013	214	* state of the returned entry.
donatien	0:632c9925f013	215	*
donatien	0:632c9925f013	216	* If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
donatien	0:632c9925f013	217	*
donatien	0:632c9925f013	218	* In all cases, attempt to create new entries from an empty entry. If no
donatien	0:632c9925f013	219	* empty entries are available and ETHARP_TRY_HARD flag is set, recycle
donatien	0:632c9925f013	220	* old entries. Heuristic choose the least important entry for recycling.
donatien	0:632c9925f013	221	*
donatien	0:632c9925f013	222	* @param ipaddr IP address to find in ARP cache, or to add if not found.
donatien	0:632c9925f013	223	* @param flags
donatien	0:632c9925f013	224	* - ETHARP_TRY_HARD: Try hard to create a entry by allowing recycling of
donatien	0:632c9925f013	225	* active (stable or pending) entries.
donatien	0:632c9925f013	226	*
donatien	0:632c9925f013	227	* @return The ARP entry index that matched or is created, ERR_MEM if no
donatien	0:632c9925f013	228	* entry is found or could be recycled.
donatien	0:632c9925f013	229	*/
donatien	0:632c9925f013	230	static s8_t
donatien	0:632c9925f013	231	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	232	find_entry(ip_addr_t ipaddr, u8_t flags, struct netif netif)
donatien	0:632c9925f013	233	#else /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	234	find_entry(ip_addr_t *ipaddr, u8_t flags)
donatien	0:632c9925f013	235	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	236	{
donatien	0:632c9925f013	237	s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
donatien	0:632c9925f013	238	s8_t empty = ARP_TABLE_SIZE;
donatien	0:632c9925f013	239	u8_t i = 0, age_pending = 0, age_stable = 0;
donatien	0:632c9925f013	240	#if ARP_QUEUEING
donatien	0:632c9925f013	241	/* oldest entry with packets on queue */
donatien	0:632c9925f013	242	s8_t old_queue = ARP_TABLE_SIZE;
donatien	0:632c9925f013	243	/* its age */
donatien	0:632c9925f013	244	u8_t age_queue = 0;
donatien	0:632c9925f013	245	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	246
donatien	0:632c9925f013	247	/* First, test if the last call to this function asked for the
donatien	0:632c9925f013	248	* same address. If so, we're really fast! */
donatien	0:632c9925f013	249	if (ipaddr) {
donatien	0:632c9925f013	250	/* ipaddr to search for was given */
donatien	0:632c9925f013	251	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	252	if ((netif != NULL) && (netif->addr_hint != NULL)) {
donatien	0:632c9925f013	253	/* per-pcb cached entry was given */
donatien	0:632c9925f013	254	u8_t per_pcb_cache = *(netif->addr_hint);
donatien	0:632c9925f013	255	if ((per_pcb_cache < ARP_TABLE_SIZE) && arp_table[per_pcb_cache].state == ETHARP_STATE_STABLE) {
donatien	0:632c9925f013	256	/* the per-pcb-cached entry is stable */
donatien	0:632c9925f013	257	if (ip_addr_cmp(ipaddr, &arp_table[per_pcb_cache].ipaddr)) {
donatien	0:632c9925f013	258	/* per-pcb cached entry was the right one! */
donatien	0:632c9925f013	259	ETHARP_STATS_INC(etharp.cachehit);
donatien	0:632c9925f013	260	return per_pcb_cache;
donatien	0:632c9925f013	261	}
donatien	0:632c9925f013	262	}
donatien	0:632c9925f013	263	}
donatien	0:632c9925f013	264	#else /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	265	if (arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) {
donatien	0:632c9925f013	266	/* the cached entry is stable */
donatien	0:632c9925f013	267	if (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr)) {
donatien	0:632c9925f013	268	/* cached entry was the right one! */
donatien	0:632c9925f013	269	ETHARP_STATS_INC(etharp.cachehit);
donatien	0:632c9925f013	270	return etharp_cached_entry;
donatien	0:632c9925f013	271	}
donatien	0:632c9925f013	272	}
donatien	0:632c9925f013	273	#endif /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	274	}
donatien	0:632c9925f013	275
donatien	0:632c9925f013	276	/**
donatien	0:632c9925f013	277	* a) do a search through the cache, remember candidates
donatien	0:632c9925f013	278	* b) select candidate entry
donatien	0:632c9925f013	279	* c) create new entry
donatien	0:632c9925f013	280	*/
donatien	0:632c9925f013	281
donatien	0:632c9925f013	282	/* a) in a single search sweep, do all of this
donatien	0:632c9925f013	283	* 1) remember the first empty entry (if any)
donatien	0:632c9925f013	284	* 2) remember the oldest stable entry (if any)
donatien	0:632c9925f013	285	* 3) remember the oldest pending entry without queued packets (if any)
donatien	0:632c9925f013	286	* 4) remember the oldest pending entry with queued packets (if any)
donatien	0:632c9925f013	287	* 5) search for a matching IP entry, either pending or stable
donatien	0:632c9925f013	288	* until 5 matches, or all entries are searched for.
donatien	0:632c9925f013	289	*/
donatien	0:632c9925f013	290
donatien	0:632c9925f013	291	for (i = 0; i < ARP_TABLE_SIZE; ++i) {
donatien	0:632c9925f013	292	/* no empty entry found yet and now we do find one? */
donatien	0:632c9925f013	293	if ((empty == ARP_TABLE_SIZE) && (arp_table[i].state == ETHARP_STATE_EMPTY)) {
donatien	0:632c9925f013	294	LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	295	/* remember first empty entry */
donatien	0:632c9925f013	296	empty = i;
donatien	0:632c9925f013	297	}
donatien	0:632c9925f013	298	/* pending entry? */
donatien	0:632c9925f013	299	else if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	0:632c9925f013	300	/* if given, does IP address match IP address in ARP entry? */
donatien	0:632c9925f013	301	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
donatien	0:632c9925f013	302	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching pending entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	303	/* found exact IP address match, simply bail out */
donatien	0:632c9925f013	304	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	305	NETIF_SET_HINT(netif, i);
donatien	0:632c9925f013	306	#else /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	307	etharp_cached_entry = i;
donatien	0:632c9925f013	308	#endif /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	309	return i;
donatien	0:632c9925f013	310	#if ARP_QUEUEING
donatien	0:632c9925f013	311	/* pending with queued packets? */
donatien	0:632c9925f013	312	} else if (arp_table[i].q != NULL) {
donatien	0:632c9925f013	313	if (arp_table[i].ctime >= age_queue) {
donatien	0:632c9925f013	314	old_queue = i;
donatien	0:632c9925f013	315	age_queue = arp_table[i].ctime;
donatien	0:632c9925f013	316	}
donatien	0:632c9925f013	317	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	318	/* pending without queued packets? */
donatien	0:632c9925f013	319	} else {
donatien	0:632c9925f013	320	if (arp_table[i].ctime >= age_pending) {
donatien	0:632c9925f013	321	old_pending = i;
donatien	0:632c9925f013	322	age_pending = arp_table[i].ctime;
donatien	0:632c9925f013	323	}
donatien	0:632c9925f013	324	}
donatien	0:632c9925f013	325	}
donatien	0:632c9925f013	326	/* stable entry? */
donatien	0:632c9925f013	327	else if (arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	0:632c9925f013	328	/* if given, does IP address match IP address in ARP entry? */
donatien	0:632c9925f013	329	if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
donatien	0:632c9925f013	330	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: found matching stable entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	331	/* found exact IP address match, simply bail out */
donatien	0:632c9925f013	332	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	333	NETIF_SET_HINT(netif, i);
donatien	0:632c9925f013	334	#else /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	335	etharp_cached_entry = i;
donatien	0:632c9925f013	336	#endif /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	337	return i;
donatien	0:632c9925f013	338	/* remember entry with oldest stable entry in oldest, its age in maxtime */
donatien	0:632c9925f013	339	} else if (arp_table[i].ctime >= age_stable) {
donatien	0:632c9925f013	340	old_stable = i;
donatien	0:632c9925f013	341	age_stable = arp_table[i].ctime;
donatien	0:632c9925f013	342	}
donatien	0:632c9925f013	343	}
donatien	0:632c9925f013	344	}
donatien	0:632c9925f013	345	/* { we have no match } => try to create a new entry */
donatien	0:632c9925f013	346
donatien	0:632c9925f013	347	/* don't create new entry, only search? */
donatien	0:632c9925f013	348	if (((flags & ETHARP_FIND_ONLY) != 0) \|\|
donatien	0:632c9925f013	349	/* or no empty entry found and not allowed to recycle? */
donatien	0:632c9925f013	350	((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_TRY_HARD) == 0))) {
donatien	0:632c9925f013	351	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
donatien	0:632c9925f013	352	return (s8_t)ERR_MEM;
donatien	0:632c9925f013	353	}
donatien	0:632c9925f013	354
donatien	0:632c9925f013	355	/* b) choose the least destructive entry to recycle:
donatien	0:632c9925f013	356	* 1) empty entry
donatien	0:632c9925f013	357	* 2) oldest stable entry
donatien	0:632c9925f013	358	* 3) oldest pending entry without queued packets
donatien	0:632c9925f013	359	* 4) oldest pending entry with queued packets
donatien	0:632c9925f013	360	*
donatien	0:632c9925f013	361	* { ETHARP_TRY_HARD is set at this point }
donatien	0:632c9925f013	362	*/
donatien	0:632c9925f013	363
donatien	0:632c9925f013	364	/* 1) empty entry available? */
donatien	0:632c9925f013	365	if (empty < ARP_TABLE_SIZE) {
donatien	0:632c9925f013	366	i = empty;
donatien	0:632c9925f013	367	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	368	}
donatien	0:632c9925f013	369	/* 2) found recyclable stable entry? */
donatien	0:632c9925f013	370	else if (old_stable < ARP_TABLE_SIZE) {
donatien	0:632c9925f013	371	/* recycle oldest stable*/
donatien	0:632c9925f013	372	i = old_stable;
donatien	0:632c9925f013	373	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
donatien	0:632c9925f013	374	#if ARP_QUEUEING
donatien	0:632c9925f013	375	/* no queued packets should exist on stable entries */
donatien	0:632c9925f013	376	LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
donatien	0:632c9925f013	377	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	378	/* 3) found recyclable pending entry without queued packets? */
donatien	0:632c9925f013	379	} else if (old_pending < ARP_TABLE_SIZE) {
donatien	0:632c9925f013	380	/* recycle oldest pending */
donatien	0:632c9925f013	381	i = old_pending;
donatien	0:632c9925f013	382	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
donatien	0:632c9925f013	383	#if ARP_QUEUEING
donatien	0:632c9925f013	384	/* 4) found recyclable pending entry with queued packets? */
donatien	0:632c9925f013	385	} else if (old_queue < ARP_TABLE_SIZE) {
donatien	0:632c9925f013	386	/* recycle oldest pending */
donatien	0:632c9925f013	387	i = old_queue;
donatien	0:632c9925f013	388	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
donatien	0:632c9925f013	389	free_etharp_q(arp_table[i].q);
donatien	0:632c9925f013	390	arp_table[i].q = NULL;
donatien	0:632c9925f013	391	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	392	/* no empty or recyclable entries found */
donatien	0:632c9925f013	393	} else {
donatien	0:632c9925f013	394	return (s8_t)ERR_MEM;
donatien	0:632c9925f013	395	}
donatien	0:632c9925f013	396
donatien	0:632c9925f013	397	/* { empty or recyclable entry found } */
donatien	0:632c9925f013	398	LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
donatien	0:632c9925f013	399
donatien	0:632c9925f013	400	if (arp_table[i].state != ETHARP_STATE_EMPTY)
donatien	0:632c9925f013	401	{
donatien	0:632c9925f013	402	snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
donatien	0:632c9925f013	403	}
donatien	0:632c9925f013	404	/* recycle entry (no-op for an already empty entry) */
donatien	0:632c9925f013	405	arp_table[i].state = ETHARP_STATE_EMPTY;
donatien	0:632c9925f013	406
donatien	0:632c9925f013	407	/* IP address given? */
donatien	0:632c9925f013	408	if (ipaddr != NULL) {
donatien	0:632c9925f013	409	/* set IP address */
donatien	0:632c9925f013	410	ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
donatien	0:632c9925f013	411	}
donatien	0:632c9925f013	412	arp_table[i].ctime = 0;
donatien	0:632c9925f013	413	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	414	NETIF_SET_HINT(netif, i);
donatien	0:632c9925f013	415	#else /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	416	etharp_cached_entry = i;
donatien	0:632c9925f013	417	#endif /* #if LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	418	return (err_t)i;
donatien	0:632c9925f013	419	}
donatien	0:632c9925f013	420
donatien	0:632c9925f013	421	/**
donatien	0:632c9925f013	422	* Send an IP packet on the network using netif->linkoutput
donatien	0:632c9925f013	423	* The ethernet header is filled in before sending.
donatien	0:632c9925f013	424	*
donatien	0:632c9925f013	425	* @params netif the lwIP network interface on which to send the packet
donatien	0:632c9925f013	426	* @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
donatien	0:632c9925f013	427	* @params src the source MAC address to be copied into the ethernet header
donatien	0:632c9925f013	428	* @params dst the destination MAC address to be copied into the ethernet header
donatien	0:632c9925f013	429	* @return ERR_OK if the packet was sent, any other err_t on failure
donatien	0:632c9925f013	430	*/
donatien	0:632c9925f013	431	static err_t
donatien	0:632c9925f013	432	etharp_send_ip(struct netif netif, struct pbuf p, struct eth_addr src, struct eth_addr dst)
donatien	0:632c9925f013	433	{
donatien	0:632c9925f013	434	struct eth_hdr ethhdr = (struct eth_hdr )p->payload;
donatien	0:632c9925f013	435	u8_t k;
donatien	0:632c9925f013	436
donatien	0:632c9925f013	437	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:632c9925f013	438	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:632c9925f013	439	k = ETHARP_HWADDR_LEN;
donatien	0:632c9925f013	440	while(k > 0) {
donatien	0:632c9925f013	441	k--;
donatien	0:632c9925f013	442	ethhdr->dest.addr[k] = dst->addr[k];
donatien	0:632c9925f013	443	ethhdr->src.addr[k] = src->addr[k];
donatien	0:632c9925f013	444	}
donatien	0:632c9925f013	445	ethhdr->type = htons(ETHTYPE_IP);
donatien	0:632c9925f013	446	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
donatien	0:632c9925f013	447	/* send the packet */
donatien	0:632c9925f013	448	return netif->linkoutput(netif, p);
donatien	0:632c9925f013	449	}
donatien	0:632c9925f013	450
donatien	0:632c9925f013	451	/**
donatien	0:632c9925f013	452	* Update (or insert) a IP/MAC address pair in the ARP cache.
donatien	0:632c9925f013	453	*
donatien	0:632c9925f013	454	* If a pending entry is resolved, any queued packets will be sent
donatien	0:632c9925f013	455	* at this point.
donatien	0:632c9925f013	456	*
donatien	0:632c9925f013	457	* @param ipaddr IP address of the inserted ARP entry.
donatien	0:632c9925f013	458	* @param ethaddr Ethernet address of the inserted ARP entry.
donatien	0:632c9925f013	459	* @param flags Defines behaviour:
donatien	0:632c9925f013	460	* - ETHARP_TRY_HARD Allows ARP to insert this as a new item. If not specified,
donatien	0:632c9925f013	461	* only existing ARP entries will be updated.
donatien	0:632c9925f013	462	*
donatien	0:632c9925f013	463	* @return
donatien	0:632c9925f013	464	* - ERR_OK Succesfully updated ARP cache.
donatien	0:632c9925f013	465	* - ERR_MEM If we could not add a new ARP entry when ETHARP_TRY_HARD was set.
donatien	0:632c9925f013	466	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
donatien	0:632c9925f013	467	*
donatien	0:632c9925f013	468	* @see pbuf_free()
donatien	0:632c9925f013	469	*/
donatien	0:632c9925f013	470	static err_t
donatien	0:632c9925f013	471	update_arp_entry(struct netif netif, ip_addr_t ipaddr, struct eth_addr *ethaddr, u8_t flags)
donatien	0:632c9925f013	472	{
donatien	0:632c9925f013	473	s8_t i;
donatien	0:632c9925f013	474	u8_t k;
donatien	0:632c9925f013	475	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry()\n"));
donatien	0:632c9925f013	476	LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
donatien	0:632c9925f013	477	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
donatien	0:632c9925f013	478	ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
donatien	0:632c9925f013	479	ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
donatien	0:632c9925f013	480	ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
donatien	0:632c9925f013	481	/* non-unicast address? */
donatien	0:632c9925f013	482	if (ip_addr_isany(ipaddr) \|\|
donatien	0:632c9925f013	483	ip_addr_isbroadcast(ipaddr, netif) \|\|
donatien	0:632c9925f013	484	ip_addr_ismulticast(ipaddr)) {
donatien	0:632c9925f013	485	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
donatien	0:632c9925f013	486	return ERR_ARG;
donatien	0:632c9925f013	487	}
donatien	0:632c9925f013	488	/* find or create ARP entry */
donatien	0:632c9925f013	489	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	490	i = find_entry(ipaddr, flags, netif);
donatien	0:632c9925f013	491	#else /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	492	i = find_entry(ipaddr, flags);
donatien	0:632c9925f013	493	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	494	/* bail out if no entry could be found */
donatien	0:632c9925f013	495	if (i < 0)
donatien	0:632c9925f013	496	return (err_t)i;
donatien	0:632c9925f013	497
donatien	0:632c9925f013	498	/* mark it stable */
donatien	0:632c9925f013	499	arp_table[i].state = ETHARP_STATE_STABLE;
donatien	0:632c9925f013	500	/* record network interface */
donatien	0:632c9925f013	501	arp_table[i].netif = netif;
donatien	0:632c9925f013	502
donatien	0:632c9925f013	503	/* insert in SNMP ARP index tree */
donatien	0:632c9925f013	504	snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
donatien	0:632c9925f013	505
donatien	0:632c9925f013	506	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
donatien	0:632c9925f013	507	/* update address */
donatien	0:632c9925f013	508	k = ETHARP_HWADDR_LEN;
donatien	0:632c9925f013	509	while (k > 0) {
donatien	0:632c9925f013	510	k--;
donatien	0:632c9925f013	511	arp_table[i].ethaddr.addr[k] = ethaddr->addr[k];
donatien	0:632c9925f013	512	}
donatien	0:632c9925f013	513	/* reset time stamp */
donatien	0:632c9925f013	514	arp_table[i].ctime = 0;
donatien	0:632c9925f013	515	#if ARP_QUEUEING
donatien	0:632c9925f013	516	/* this is where we will send out queued packets! */
donatien	0:632c9925f013	517	while (arp_table[i].q != NULL) {
donatien	0:632c9925f013	518	struct pbuf *p;
donatien	0:632c9925f013	519	/* remember remainder of queue */
donatien	0:632c9925f013	520	struct etharp_q_entry *q = arp_table[i].q;
donatien	0:632c9925f013	521	/* pop first item off the queue */
donatien	0:632c9925f013	522	arp_table[i].q = q->next;
donatien	0:632c9925f013	523	/* get the packet pointer */
donatien	0:632c9925f013	524	p = q->p;
donatien	0:632c9925f013	525	/* now queue entry can be freed */
donatien	0:632c9925f013	526	memp_free(MEMP_ARP_QUEUE, q);
donatien	0:632c9925f013	527	/* send the queued IP packet */
donatien	0:632c9925f013	528	etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
donatien	0:632c9925f013	529	/* free the queued IP packet */
donatien	0:632c9925f013	530	pbuf_free(p);
donatien	0:632c9925f013	531	}
donatien	0:632c9925f013	532	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	533	return ERR_OK;
donatien	0:632c9925f013	534	}
donatien	0:632c9925f013	535
donatien	0:632c9925f013	536	/**
donatien	0:632c9925f013	537	* Finds (stable) ethernet/IP address pair from ARP table
donatien	0:632c9925f013	538	* using interface and IP address index.
donatien	0:632c9925f013	539	* @note the addresses in the ARP table are in network order!
donatien	0:632c9925f013	540	*
donatien	0:632c9925f013	541	* @param netif points to interface index
donatien	0:632c9925f013	542	* @param ipaddr points to the (network order) IP address index
donatien	0:632c9925f013	543	* @param eth_ret points to return pointer
donatien	0:632c9925f013	544	* @param ip_ret points to return pointer
donatien	0:632c9925f013	545	* @return table index if found, -1 otherwise
donatien	0:632c9925f013	546	*/
donatien	0:632c9925f013	547	s8_t
donatien	0:632c9925f013	548	etharp_find_addr(struct netif netif, ip_addr_t ipaddr,
donatien	0:632c9925f013	549	struct eth_addr eth_ret, ip_addr_t ip_ret)
donatien	0:632c9925f013	550	{
donatien	0:632c9925f013	551	s8_t i;
donatien	0:632c9925f013	552
donatien	0:632c9925f013	553	LWIP_UNUSED_ARG(netif);
donatien	0:632c9925f013	554
donatien	0:632c9925f013	555	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	556	i = find_entry(ipaddr, ETHARP_FIND_ONLY, NULL);
donatien	0:632c9925f013	557	#else /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	558	i = find_entry(ipaddr, ETHARP_FIND_ONLY);
donatien	0:632c9925f013	559	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	560	if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	0:632c9925f013	561	*eth_ret = &arp_table[i].ethaddr;
donatien	0:632c9925f013	562	*ip_ret = &arp_table[i].ipaddr;
donatien	0:632c9925f013	563	return i;
donatien	0:632c9925f013	564	}
donatien	0:632c9925f013	565	return -1;
donatien	0:632c9925f013	566	}
donatien	0:632c9925f013	567	#if ETHARP_TRUST_IP_MAC
donatien	0:632c9925f013	568	/**
donatien	0:632c9925f013	569	* Updates the ARP table using the given IP packet.
donatien	0:632c9925f013	570	*
donatien	0:632c9925f013	571	* Uses the incoming IP packet's source address to update the
donatien	0:632c9925f013	572	* ARP cache for the local network. The function does not alter
donatien	0:632c9925f013	573	* or free the packet. This function must be called before the
donatien	0:632c9925f013	574	* packet p is passed to the IP layer.
donatien	0:632c9925f013	575	*
donatien	0:632c9925f013	576	* @param netif The lwIP network interface on which the IP packet pbuf arrived.
donatien	0:632c9925f013	577	* @param p The IP packet that arrived on netif.
donatien	0:632c9925f013	578	*
donatien	0:632c9925f013	579	* @return NULL
donatien	0:632c9925f013	580	*
donatien	0:632c9925f013	581	* @see pbuf_free()
donatien	0:632c9925f013	582	*/
donatien	0:632c9925f013	583	static void
donatien	0:632c9925f013	584	etharp_ip_input(struct netif netif, struct pbuf p)
donatien	0:632c9925f013	585	{
donatien	0:632c9925f013	586	struct eth_hdr *ethhdr;
donatien	0:632c9925f013	587	struct ip_hdr *iphdr;
donatien	0:632c9925f013	588	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:632c9925f013	589
donatien	0:632c9925f013	590	/* Only insert an entry if the source IP address of the
donatien	0:632c9925f013	591	incoming IP packet comes from a host on the local network. */
donatien	0:632c9925f013	592	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	593	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	594	#if ETHARP_SUPPORT_VLAN
donatien	0:632c9925f013	595	if (ethhdr->type == ETHTYPE_VLAN) {
donatien	0:632c9925f013	596	iphdr = (struct ip_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
donatien	0:632c9925f013	597	}
donatien	0:632c9925f013	598	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:632c9925f013	599
donatien	0:632c9925f013	600	/* source is not on the local network? */
donatien	0:632c9925f013	601	if (!ip_addr_netcmp(&(iphdr->src), &(netif->ip_addr), &(netif->netmask))) {
donatien	0:632c9925f013	602	/* do nothing */
donatien	0:632c9925f013	603	return;
donatien	0:632c9925f013	604	}
donatien	0:632c9925f013	605
donatien	0:632c9925f013	606	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
donatien	0:632c9925f013	607	/* update the source IP address in the cache, if present */
donatien	0:632c9925f013	608	/* @todo We could use ETHARP_TRY_HARD if we think we are going to talk
donatien	0:632c9925f013	609	* back soon (for example, if the destination IP address is ours. */
donatien	0:632c9925f013	610	update_arp_entry(netif, &(iphdr->src), &(ethhdr->src), ETHARP_FIND_ONLY);
donatien	0:632c9925f013	611	}
donatien	0:632c9925f013	612	#endif /* ETHARP_TRUST_IP_MAC */
donatien	0:632c9925f013	613
donatien	0:632c9925f013	614	/**
donatien	0:632c9925f013	615	* Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
donatien	0:632c9925f013	616	* send out queued IP packets. Updates cache with snooped address pairs.
donatien	0:632c9925f013	617	*
donatien	0:632c9925f013	618	* Should be called for incoming ARP packets. The pbuf in the argument
donatien	0:632c9925f013	619	* is freed by this function.
donatien	0:632c9925f013	620	*
donatien	0:632c9925f013	621	* @param netif The lwIP network interface on which the ARP packet pbuf arrived.
donatien	0:632c9925f013	622	* @param ethaddr Ethernet address of netif.
donatien	0:632c9925f013	623	* @param p The ARP packet that arrived on netif. Is freed by this function.
donatien	0:632c9925f013	624	*
donatien	0:632c9925f013	625	* @return NULL
donatien	0:632c9925f013	626	*
donatien	0:632c9925f013	627	* @see pbuf_free()
donatien	0:632c9925f013	628	*/
donatien	0:632c9925f013	629	static void
donatien	0:632c9925f013	630	etharp_arp_input(struct netif netif, struct eth_addr ethaddr, struct pbuf *p)
donatien	0:632c9925f013	631	{
donatien	0:632c9925f013	632	struct etharp_hdr *hdr;
donatien	0:632c9925f013	633	struct eth_hdr *ethhdr;
donatien	0:632c9925f013	634	/* these are aligned properly, whereas the ARP header fields might not be */
donatien	0:632c9925f013	635	ip_addr_t sipaddr, dipaddr;
donatien	0:632c9925f013	636	u8_t i;
donatien	0:632c9925f013	637	u8_t for_us;
donatien	0:632c9925f013	638	#if LWIP_AUTOIP
donatien	0:632c9925f013	639	const u8_t * ethdst_hwaddr;
donatien	0:632c9925f013	640	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	641
donatien	0:632c9925f013	642	LWIP_ERROR("netif != NULL", (netif != NULL), return;);
donatien	0:632c9925f013	643
donatien	0:632c9925f013	644	/* drop short ARP packets: we have to check for p->len instead of p->tot_len here
donatien	0:632c9925f013	645	since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
donatien	0:632c9925f013	646	if (p->len < SIZEOF_ETHARP_PACKET) {
donatien	0:632c9925f013	647	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:632c9925f013	648	("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
donatien	0:632c9925f013	649	(s16_t)SIZEOF_ETHARP_PACKET));
donatien	0:632c9925f013	650	ETHARP_STATS_INC(etharp.lenerr);
donatien	0:632c9925f013	651	ETHARP_STATS_INC(etharp.drop);
donatien	0:632c9925f013	652	pbuf_free(p);
donatien	0:632c9925f013	653	return;
donatien	0:632c9925f013	654	}
donatien	0:632c9925f013	655
donatien	0:632c9925f013	656	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	657	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	658	#if ETHARP_SUPPORT_VLAN
donatien	0:632c9925f013	659	if (ethhdr->type == ETHTYPE_VLAN) {
donatien	0:632c9925f013	660	hdr = (struct etharp_hdr )(((u8_t)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
donatien	0:632c9925f013	661	}
donatien	0:632c9925f013	662	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:632c9925f013	663
donatien	0:632c9925f013	664	/* RFC 826 "Packet Reception": */
donatien	0:632c9925f013	665	if ((hdr->hwtype != htons(HWTYPE_ETHERNET)) \|\|
donatien	0:632c9925f013	666	(hdr->_hwlen_protolen != htons((ETHARP_HWADDR_LEN << 8) \| sizeof(ip_addr_t))) \|\|
donatien	0:632c9925f013	667	(hdr->proto != htons(ETHTYPE_IP)) \|\|
donatien	0:632c9925f013	668	(ethhdr->type != htons(ETHTYPE_ARP))) {
donatien	0:632c9925f013	669	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING,
donatien	0:632c9925f013	670	("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
donatien	0:632c9925f013	671	hdr->hwtype, ARPH_HWLEN(hdr), hdr->proto, ARPH_PROTOLEN(hdr), ethhdr->type));
donatien	0:632c9925f013	672	ETHARP_STATS_INC(etharp.proterr);
donatien	0:632c9925f013	673	ETHARP_STATS_INC(etharp.drop);
donatien	0:632c9925f013	674	pbuf_free(p);
donatien	0:632c9925f013	675	return;
donatien	0:632c9925f013	676	}
donatien	0:632c9925f013	677	ETHARP_STATS_INC(etharp.recv);
donatien	0:632c9925f013	678
donatien	0:632c9925f013	679	#if LWIP_AUTOIP
donatien	0:632c9925f013	680	/* We have to check if a host already has configured our random
donatien	0:632c9925f013	681	* created link local address and continously check if there is
donatien	0:632c9925f013	682	* a host with this IP-address so we can detect collisions */
donatien	0:632c9925f013	683	autoip_arp_reply(netif, hdr);
donatien	0:632c9925f013	684	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	685
donatien	0:632c9925f013	686	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
donatien	0:632c9925f013	687	* structure packing (not using structure copy which breaks strict-aliasing rules). */
donatien	0:632c9925f013	688	SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
donatien	0:632c9925f013	689	SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
donatien	0:632c9925f013	690
donatien	0:632c9925f013	691	/* this interface is not configured? */
donatien	0:632c9925f013	692	if (ip_addr_isany(&netif->ip_addr)) {
donatien	0:632c9925f013	693	for_us = 0;
donatien	0:632c9925f013	694	} else {
donatien	0:632c9925f013	695	/* ARP packet directed to us? */
donatien	0:632c9925f013	696	for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
donatien	0:632c9925f013	697	}
donatien	0:632c9925f013	698
donatien	0:632c9925f013	699	/* ARP message directed to us? */
donatien	0:632c9925f013	700	if (for_us) {
donatien	0:632c9925f013	701	/* add IP address in ARP cache; assume requester wants to talk to us.
donatien	0:632c9925f013	702	* can result in directly sending the queued packets for this host. */
donatien	0:632c9925f013	703	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_TRY_HARD);
donatien	0:632c9925f013	704	/* ARP message not directed to us? */
donatien	0:632c9925f013	705	} else {
donatien	0:632c9925f013	706	/* update the source IP address in the cache, if present */
donatien	0:632c9925f013	707	update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_FIND_ONLY);
donatien	0:632c9925f013	708	}
donatien	0:632c9925f013	709
donatien	0:632c9925f013	710	/* now act on the message itself */
donatien	0:632c9925f013	711	switch (htons(hdr->opcode)) {
donatien	0:632c9925f013	712	/* ARP request? */
donatien	0:632c9925f013	713	case ARP_REQUEST:
donatien	0:632c9925f013	714	/* ARP request. If it asked for our address, we send out a
donatien	0:632c9925f013	715	* reply. In any case, we time-stamp any existing ARP entry,
donatien	0:632c9925f013	716	* and possiby send out an IP packet that was queued on it. */
donatien	0:632c9925f013	717
donatien	0:632c9925f013	718	LWIP_DEBUGF (ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
donatien	0:632c9925f013	719	/* ARP request for our address? */
donatien	0:632c9925f013	720	if (for_us) {
donatien	0:632c9925f013	721
donatien	0:632c9925f013	722	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
donatien	0:632c9925f013	723	/* Re-use pbuf to send ARP reply.
donatien	0:632c9925f013	724	Since we are re-using an existing pbuf, we can't call etharp_raw since
donatien	0:632c9925f013	725	that would allocate a new pbuf. */
donatien	0:632c9925f013	726	hdr->opcode = htons(ARP_REPLY);
donatien	0:632c9925f013	727
donatien	0:632c9925f013	728	SMEMCPY(&hdr->dipaddr, &hdr->sipaddr, sizeof(ip_addr_t));
donatien	0:632c9925f013	729	SMEMCPY(&hdr->sipaddr, &netif->ip_addr, sizeof(ip_addr_t));
donatien	0:632c9925f013	730
donatien	0:632c9925f013	731	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:632c9925f013	732	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:632c9925f013	733	i = ETHARP_HWADDR_LEN;
donatien	0:632c9925f013	734	#if LWIP_AUTOIP
donatien	0:632c9925f013	735	/* If we are using Link-Local, all ARP packets that contain a Link-Local
donatien	0:632c9925f013	736	* 'sender IP address' MUST be sent using link-layer broadcast instead of
donatien	0:632c9925f013	737	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
donatien	0:632c9925f013	738	ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
donatien	0:632c9925f013	739	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	740
donatien	0:632c9925f013	741	while(i > 0) {
donatien	0:632c9925f013	742	i--;
donatien	0:632c9925f013	743	hdr->dhwaddr.addr[i] = hdr->shwaddr.addr[i];
donatien	0:632c9925f013	744	#if LWIP_AUTOIP
donatien	0:632c9925f013	745	ethhdr->dest.addr[i] = ethdst_hwaddr[i];
donatien	0:632c9925f013	746	#else /* LWIP_AUTOIP */
donatien	0:632c9925f013	747	ethhdr->dest.addr[i] = hdr->shwaddr.addr[i];
donatien	0:632c9925f013	748	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	749	hdr->shwaddr.addr[i] = ethaddr->addr[i];
donatien	0:632c9925f013	750	ethhdr->src.addr[i] = ethaddr->addr[i];
donatien	0:632c9925f013	751	}
donatien	0:632c9925f013	752
donatien	0:632c9925f013	753	/* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
donatien	0:632c9925f013	754	are already correct, we tested that before */
donatien	0:632c9925f013	755
donatien	0:632c9925f013	756	/* return ARP reply */
donatien	0:632c9925f013	757	netif->linkoutput(netif, p);
donatien	0:632c9925f013	758	/* we are not configured? */
donatien	0:632c9925f013	759	} else if (ip_addr_isany(&netif->ip_addr)) {
donatien	0:632c9925f013	760	/* { for_us == 0 and netif->ip_addr.addr == 0 } */
donatien	0:632c9925f013	761	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
donatien	0:632c9925f013	762	/* request was not directed to us */
donatien	0:632c9925f013	763	} else {
donatien	0:632c9925f013	764	/* { for_us == 0 and netif->ip_addr.addr != 0 } */
donatien	0:632c9925f013	765	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
donatien	0:632c9925f013	766	}
donatien	0:632c9925f013	767	break;
donatien	0:632c9925f013	768	case ARP_REPLY:
donatien	0:632c9925f013	769	/* ARP reply. We already updated the ARP cache earlier. */
donatien	0:632c9925f013	770	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
donatien	0:632c9925f013	771	#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
donatien	0:632c9925f013	772	/* DHCP wants to know about ARP replies from any host with an
donatien	0:632c9925f013	773	* IP address also offered to us by the DHCP server. We do not
donatien	0:632c9925f013	774	* want to take a duplicate IP address on a single network.
donatien	0:632c9925f013	775	* @todo How should we handle redundant (fail-over) interfaces? */
donatien	0:632c9925f013	776	dhcp_arp_reply(netif, &sipaddr);
donatien	0:632c9925f013	777	#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
donatien	0:632c9925f013	778	break;
donatien	0:632c9925f013	779	default:
donatien	0:632c9925f013	780	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
donatien	0:632c9925f013	781	ETHARP_STATS_INC(etharp.err);
donatien	0:632c9925f013	782	break;
donatien	0:632c9925f013	783	}
donatien	0:632c9925f013	784	/* free ARP packet */
donatien	0:632c9925f013	785	pbuf_free(p);
donatien	0:632c9925f013	786	}
donatien	0:632c9925f013	787
donatien	0:632c9925f013	788	/**
donatien	0:632c9925f013	789	* Resolve and fill-in Ethernet address header for outgoing IP packet.
donatien	0:632c9925f013	790	*
donatien	0:632c9925f013	791	* For IP multicast and broadcast, corresponding Ethernet addresses
donatien	0:632c9925f013	792	* are selected and the packet is transmitted on the link.
donatien	0:632c9925f013	793	*
donatien	0:632c9925f013	794	* For unicast addresses, the packet is submitted to etharp_query(). In
donatien	0:632c9925f013	795	* case the IP address is outside the local network, the IP address of
donatien	0:632c9925f013	796	* the gateway is used.
donatien	0:632c9925f013	797	*
donatien	0:632c9925f013	798	* @param netif The lwIP network interface which the IP packet will be sent on.
donatien	0:632c9925f013	799	* @param q The pbuf(s) containing the IP packet to be sent.
donatien	0:632c9925f013	800	* @param ipaddr The IP address of the packet destination.
donatien	0:632c9925f013	801	*
donatien	0:632c9925f013	802	* @return
donatien	0:632c9925f013	803	* - ERR_RTE No route to destination (no gateway to external networks),
donatien	0:632c9925f013	804	* or the return type of either etharp_query() or etharp_send_ip().
donatien	0:632c9925f013	805	*/
donatien	0:632c9925f013	806	err_t
donatien	0:632c9925f013	807	etharp_output(struct netif netif, struct pbuf q, ip_addr_t *ipaddr)
donatien	0:632c9925f013	808	{
donatien	0:632c9925f013	809	struct eth_addr *dest, mcastaddr;
donatien	0:632c9925f013	810
donatien	0:632c9925f013	811	/* make room for Ethernet header - should not fail */
donatien	0:632c9925f013	812	if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
donatien	0:632c9925f013	813	/* bail out */
donatien	0:632c9925f013	814	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	815	("etharp_output: could not allocate room for header.\n"));
donatien	0:632c9925f013	816	LINK_STATS_INC(link.lenerr);
donatien	0:632c9925f013	817	return ERR_BUF;
donatien	0:632c9925f013	818	}
donatien	0:632c9925f013	819
donatien	0:632c9925f013	820	/* assume unresolved Ethernet address */
donatien	0:632c9925f013	821	dest = NULL;
donatien	0:632c9925f013	822	/* Determine on destination hardware address. Broadcasts and multicasts
donatien	0:632c9925f013	823	* are special, other IP addresses are looked up in the ARP table. */
donatien	0:632c9925f013	824
donatien	0:632c9925f013	825	/* broadcast destination IP address? */
donatien	0:632c9925f013	826	if (ip_addr_isbroadcast(ipaddr, netif)) {
donatien	0:632c9925f013	827	/* broadcast on Ethernet also */
donatien	0:632c9925f013	828	dest = (struct eth_addr *)&ethbroadcast;
donatien	0:632c9925f013	829	/* multicast destination IP address? */
donatien	0:632c9925f013	830	} else if (ip_addr_ismulticast(ipaddr)) {
donatien	0:632c9925f013	831	/* Hash IP multicast address to MAC address.*/
donatien	0:632c9925f013	832	mcastaddr.addr[0] = 0x01;
donatien	0:632c9925f013	833	mcastaddr.addr[1] = 0x00;
donatien	0:632c9925f013	834	mcastaddr.addr[2] = 0x5e;
donatien	0:632c9925f013	835	mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
donatien	0:632c9925f013	836	mcastaddr.addr[4] = ip4_addr3(ipaddr);
donatien	0:632c9925f013	837	mcastaddr.addr[5] = ip4_addr4(ipaddr);
donatien	0:632c9925f013	838	/* destination Ethernet address is multicast */
donatien	0:632c9925f013	839	dest = &mcastaddr;
donatien	0:632c9925f013	840	/* unicast destination IP address? */
donatien	0:632c9925f013	841	} else {
donatien	0:632c9925f013	842	/* outside local network? */
donatien	0:632c9925f013	843	if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
donatien	0:632c9925f013	844	!ip_addr_islinklocal(ipaddr)) {
donatien	0:632c9925f013	845	/* interface has default gateway? */
donatien	0:632c9925f013	846	if (!ip_addr_isany(&netif->gw)) {
donatien	0:632c9925f013	847	/* send to hardware address of default gateway IP address */
donatien	0:632c9925f013	848	ipaddr = &(netif->gw);
donatien	0:632c9925f013	849	/* no default gateway available */
donatien	0:632c9925f013	850	} else {
donatien	0:632c9925f013	851	/* no route to destination error (default gateway missing) */
donatien	0:632c9925f013	852	return ERR_RTE;
donatien	0:632c9925f013	853	}
donatien	0:632c9925f013	854	}
donatien	0:632c9925f013	855	/* queue on destination Ethernet address belonging to ipaddr */
donatien	0:632c9925f013	856	return etharp_query(netif, ipaddr, q);
donatien	0:632c9925f013	857	}
donatien	0:632c9925f013	858
donatien	0:632c9925f013	859	/* continuation for multicast/broadcast destinations */
donatien	0:632c9925f013	860	/* obtain source Ethernet address of the given interface */
donatien	0:632c9925f013	861	/* send packet directly on the link */
donatien	0:632c9925f013	862	return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
donatien	0:632c9925f013	863	}
donatien	0:632c9925f013	864
donatien	0:632c9925f013	865	/**
donatien	0:632c9925f013	866	* Send an ARP request for the given IP address and/or queue a packet.
donatien	0:632c9925f013	867	*
donatien	0:632c9925f013	868	* If the IP address was not yet in the cache, a pending ARP cache entry
donatien	0:632c9925f013	869	* is added and an ARP request is sent for the given address. The packet
donatien	0:632c9925f013	870	* is queued on this entry.
donatien	0:632c9925f013	871	*
donatien	0:632c9925f013	872	* If the IP address was already pending in the cache, a new ARP request
donatien	0:632c9925f013	873	* is sent for the given address. The packet is queued on this entry.
donatien	0:632c9925f013	874	*
donatien	0:632c9925f013	875	* If the IP address was already stable in the cache, and a packet is
donatien	0:632c9925f013	876	* given, it is directly sent and no ARP request is sent out.
donatien	0:632c9925f013	877	*
donatien	0:632c9925f013	878	* If the IP address was already stable in the cache, and no packet is
donatien	0:632c9925f013	879	* given, an ARP request is sent out.
donatien	0:632c9925f013	880	*
donatien	0:632c9925f013	881	* @param netif The lwIP network interface on which ipaddr
donatien	0:632c9925f013	882	* must be queried for.
donatien	0:632c9925f013	883	* @param ipaddr The IP address to be resolved.
donatien	0:632c9925f013	884	* @param q If non-NULL, a pbuf that must be delivered to the IP address.
donatien	0:632c9925f013	885	* q is not freed by this function.
donatien	0:632c9925f013	886	*
donatien	0:632c9925f013	887	* @note q must only be ONE packet, not a packet queue!
donatien	0:632c9925f013	888	*
donatien	0:632c9925f013	889	* @return
donatien	0:632c9925f013	890	* - ERR_BUF Could not make room for Ethernet header.
donatien	0:632c9925f013	891	* - ERR_MEM Hardware address unknown, and no more ARP entries available
donatien	0:632c9925f013	892	* to query for address or queue the packet.
donatien	0:632c9925f013	893	* - ERR_MEM Could not queue packet due to memory shortage.
donatien	0:632c9925f013	894	* - ERR_RTE No route to destination (no gateway to external networks).
donatien	0:632c9925f013	895	* - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
donatien	0:632c9925f013	896	*
donatien	0:632c9925f013	897	*/
donatien	0:632c9925f013	898	err_t
donatien	0:632c9925f013	899	etharp_query(struct netif netif, ip_addr_t ipaddr, struct pbuf *q)
donatien	0:632c9925f013	900	{
donatien	0:632c9925f013	901	struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
donatien	0:632c9925f013	902	err_t result = ERR_MEM;
donatien	0:632c9925f013	903	s8_t i; /* ARP entry index */
donatien	0:632c9925f013	904
donatien	0:632c9925f013	905	/* non-unicast address? */
donatien	0:632c9925f013	906	if (ip_addr_isbroadcast(ipaddr, netif) \|\|
donatien	0:632c9925f013	907	ip_addr_ismulticast(ipaddr) \|\|
donatien	0:632c9925f013	908	ip_addr_isany(ipaddr)) {
donatien	0:632c9925f013	909	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
donatien	0:632c9925f013	910	return ERR_ARG;
donatien	0:632c9925f013	911	}
donatien	0:632c9925f013	912
donatien	0:632c9925f013	913	/* find entry in ARP cache, ask to create entry if queueing packet */
donatien	0:632c9925f013	914	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	915	i = find_entry(ipaddr, ETHARP_TRY_HARD, netif);
donatien	0:632c9925f013	916	#else /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	917	i = find_entry(ipaddr, ETHARP_TRY_HARD);
donatien	0:632c9925f013	918	#endif /* LWIP_NETIF_HWADDRHINT */
donatien	0:632c9925f013	919
donatien	0:632c9925f013	920	/* could not find or create entry? */
donatien	0:632c9925f013	921	if (i < 0) {
donatien	0:632c9925f013	922	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
donatien	0:632c9925f013	923	if (q) {
donatien	0:632c9925f013	924	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
donatien	0:632c9925f013	925	ETHARP_STATS_INC(etharp.memerr);
donatien	0:632c9925f013	926	}
donatien	0:632c9925f013	927	return (err_t)i;
donatien	0:632c9925f013	928	}
donatien	0:632c9925f013	929
donatien	0:632c9925f013	930	/* mark a fresh entry as pending (we just sent a request) */
donatien	0:632c9925f013	931	if (arp_table[i].state == ETHARP_STATE_EMPTY) {
donatien	0:632c9925f013	932	arp_table[i].state = ETHARP_STATE_PENDING;
donatien	0:632c9925f013	933	}
donatien	0:632c9925f013	934
donatien	0:632c9925f013	935	/* { i is either a STABLE or (new or existing) PENDING entry } */
donatien	0:632c9925f013	936	LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
donatien	0:632c9925f013	937	((arp_table[i].state == ETHARP_STATE_PENDING) \|\|
donatien	0:632c9925f013	938	(arp_table[i].state == ETHARP_STATE_STABLE)));
donatien	0:632c9925f013	939
donatien	0:632c9925f013	940	/* do we have a pending entry? or an implicit query request? */
donatien	0:632c9925f013	941	if ((arp_table[i].state == ETHARP_STATE_PENDING) \|\| (q == NULL)) {
donatien	0:632c9925f013	942	/* try to resolve it; send out ARP request */
donatien	0:632c9925f013	943	result = etharp_request(netif, ipaddr);
donatien	0:632c9925f013	944	if (result != ERR_OK) {
donatien	0:632c9925f013	945	/* ARP request couldn't be sent */
donatien	0:632c9925f013	946	/* We don't re-send arp request in etharp_tmr, but we still queue packets,
donatien	0:632c9925f013	947	since this failure could be temporary, and the next packet calling
donatien	0:632c9925f013	948	etharp_query again could lead to sending the queued packets. */
donatien	0:632c9925f013	949	}
donatien	0:632c9925f013	950	}
donatien	0:632c9925f013	951
donatien	0:632c9925f013	952	/* packet given? */
donatien	0:632c9925f013	953	if (q != NULL) {
donatien	0:632c9925f013	954	/* stable entry? */
donatien	0:632c9925f013	955	if (arp_table[i].state == ETHARP_STATE_STABLE) {
donatien	0:632c9925f013	956	/* we have a valid IP->Ethernet address mapping */
donatien	0:632c9925f013	957	/* send the packet */
donatien	0:632c9925f013	958	result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
donatien	0:632c9925f013	959	/* pending entry? (either just created or already pending */
donatien	0:632c9925f013	960	} else if (arp_table[i].state == ETHARP_STATE_PENDING) {
donatien	0:632c9925f013	961	#if ARP_QUEUEING /* queue the given q packet */
donatien	0:632c9925f013	962	struct pbuf *p;
donatien	0:632c9925f013	963	int copy_needed = 0;
donatien	0:632c9925f013	964	/* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
donatien	0:632c9925f013	965	* to copy the whole queue into a new PBUF_RAM (see bug #11400)
donatien	0:632c9925f013	966	* PBUF_ROMs can be left as they are, since ROM must not get changed. */
donatien	0:632c9925f013	967	p = q;
donatien	0:632c9925f013	968	while (p) {
donatien	0:632c9925f013	969	LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) \|\| (p->next == 0));
donatien	0:632c9925f013	970	if(p->type != PBUF_ROM) {
donatien	0:632c9925f013	971	copy_needed = 1;
donatien	0:632c9925f013	972	break;
donatien	0:632c9925f013	973	}
donatien	0:632c9925f013	974	p = p->next;
donatien	0:632c9925f013	975	}
donatien	0:632c9925f013	976	if(copy_needed) {
donatien	0:632c9925f013	977	/* copy the whole packet into new pbufs */
donatien	0:632c9925f013	978	p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
donatien	0:632c9925f013	979	if(p != NULL) {
donatien	0:632c9925f013	980	if (pbuf_copy(p, q) != ERR_OK) {
donatien	0:632c9925f013	981	pbuf_free(p);
donatien	0:632c9925f013	982	p = NULL;
donatien	0:632c9925f013	983	}
donatien	0:632c9925f013	984	}
donatien	0:632c9925f013	985	} else {
donatien	0:632c9925f013	986	/* referencing the old pbuf is enough */
donatien	0:632c9925f013	987	p = q;
donatien	0:632c9925f013	988	pbuf_ref(p);
donatien	0:632c9925f013	989	}
donatien	0:632c9925f013	990	/* packet could be taken over? */
donatien	0:632c9925f013	991	if (p != NULL) {
donatien	0:632c9925f013	992	/* queue packet ... */
donatien	0:632c9925f013	993	struct etharp_q_entry *new_entry;
donatien	0:632c9925f013	994	/* allocate a new arp queue entry */
donatien	0:632c9925f013	995	new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
donatien	0:632c9925f013	996	if (new_entry != NULL) {
donatien	0:632c9925f013	997	new_entry->next = 0;
donatien	0:632c9925f013	998	new_entry->p = p;
donatien	0:632c9925f013	999	if(arp_table[i].q != NULL) {
donatien	0:632c9925f013	1000	/* queue was already existent, append the new entry to the end */
donatien	0:632c9925f013	1001	struct etharp_q_entry *r;
donatien	0:632c9925f013	1002	r = arp_table[i].q;
donatien	0:632c9925f013	1003	while (r->next != NULL) {
donatien	0:632c9925f013	1004	r = r->next;
donatien	0:632c9925f013	1005	}
donatien	0:632c9925f013	1006	r->next = new_entry;
donatien	0:632c9925f013	1007	} else {
donatien	0:632c9925f013	1008	/* queue did not exist, first item in queue */
donatien	0:632c9925f013	1009	arp_table[i].q = new_entry;
donatien	0:632c9925f013	1010	}
donatien	0:632c9925f013	1011	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
donatien	0:632c9925f013	1012	result = ERR_OK;
donatien	0:632c9925f013	1013	} else {
donatien	0:632c9925f013	1014	/* the pool MEMP_ARP_QUEUE is empty */
donatien	0:632c9925f013	1015	pbuf_free(p);
donatien	0:632c9925f013	1016	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
donatien	0:632c9925f013	1017	/* { result == ERR_MEM } through initialization */
donatien	0:632c9925f013	1018	}
donatien	0:632c9925f013	1019	} else {
donatien	0:632c9925f013	1020	ETHARP_STATS_INC(etharp.memerr);
donatien	0:632c9925f013	1021	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
donatien	0:632c9925f013	1022	/* { result == ERR_MEM } through initialization */
donatien	0:632c9925f013	1023	}
donatien	0:632c9925f013	1024	#else /* ARP_QUEUEING */
donatien	0:632c9925f013	1025	/* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */
donatien	0:632c9925f013	1026	/* { result == ERR_MEM } through initialization */
donatien	0:632c9925f013	1027	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q));
donatien	0:632c9925f013	1028	#endif /* ARP_QUEUEING */
donatien	0:632c9925f013	1029	}
donatien	0:632c9925f013	1030	}
donatien	0:632c9925f013	1031	return result;
donatien	0:632c9925f013	1032	}
donatien	0:632c9925f013	1033
donatien	0:632c9925f013	1034	/**
donatien	0:632c9925f013	1035	* Send a raw ARP packet (opcode and all addresses can be modified)
donatien	0:632c9925f013	1036	*
donatien	0:632c9925f013	1037	* @param netif the lwip network interface on which to send the ARP packet
donatien	0:632c9925f013	1038	* @param ethsrc_addr the source MAC address for the ethernet header
donatien	0:632c9925f013	1039	* @param ethdst_addr the destination MAC address for the ethernet header
donatien	0:632c9925f013	1040	* @param hwsrc_addr the source MAC address for the ARP protocol header
donatien	0:632c9925f013	1041	* @param ipsrc_addr the source IP address for the ARP protocol header
donatien	0:632c9925f013	1042	* @param hwdst_addr the destination MAC address for the ARP protocol header
donatien	0:632c9925f013	1043	* @param ipdst_addr the destination IP address for the ARP protocol header
donatien	0:632c9925f013	1044	* @param opcode the type of the ARP packet
donatien	0:632c9925f013	1045	* @return ERR_OK if the ARP packet has been sent
donatien	0:632c9925f013	1046	* ERR_MEM if the ARP packet couldn't be allocated
donatien	0:632c9925f013	1047	* any other err_t on failure
donatien	0:632c9925f013	1048	*/
donatien	0:632c9925f013	1049	#if !LWIP_AUTOIP
donatien	0:632c9925f013	1050	static
donatien	0:632c9925f013	1051	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	1052	err_t
donatien	0:632c9925f013	1053	etharp_raw(struct netif netif, const struct eth_addr ethsrc_addr,
donatien	0:632c9925f013	1054	const struct eth_addr *ethdst_addr,
donatien	0:632c9925f013	1055	const struct eth_addr hwsrc_addr, const ip_addr_t ipsrc_addr,
donatien	0:632c9925f013	1056	const struct eth_addr hwdst_addr, const ip_addr_t ipdst_addr,
donatien	0:632c9925f013	1057	const u16_t opcode)
donatien	0:632c9925f013	1058	{
donatien	0:632c9925f013	1059	struct pbuf *p;
donatien	0:632c9925f013	1060	err_t result = ERR_OK;
donatien	0:632c9925f013	1061	u8_t k; /* ARP entry index */
donatien	0:632c9925f013	1062	struct eth_hdr *ethhdr;
donatien	0:632c9925f013	1063	struct etharp_hdr *hdr;
donatien	0:632c9925f013	1064	#if LWIP_AUTOIP
donatien	0:632c9925f013	1065	const u8_t * ethdst_hwaddr;
donatien	0:632c9925f013	1066	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	1067
donatien	0:632c9925f013	1068	/* allocate a pbuf for the outgoing ARP request packet */
donatien	0:632c9925f013	1069	p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
donatien	0:632c9925f013	1070	/* could allocate a pbuf for an ARP request? */
donatien	0:632c9925f013	1071	if (p == NULL) {
donatien	0:632c9925f013	1072	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	1073	("etharp_raw: could not allocate pbuf for ARP request.\n"));
donatien	0:632c9925f013	1074	ETHARP_STATS_INC(etharp.memerr);
donatien	0:632c9925f013	1075	return ERR_MEM;
donatien	0:632c9925f013	1076	}
donatien	0:632c9925f013	1077	LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
donatien	0:632c9925f013	1078	(p->len >= SIZEOF_ETHARP_PACKET));
donatien	0:632c9925f013	1079
donatien	0:632c9925f013	1080	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	1081	hdr = (struct etharp_hdr )((u8_t)ethhdr + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	1082	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
donatien	0:632c9925f013	1083	hdr->opcode = htons(opcode);
donatien	0:632c9925f013	1084
donatien	0:632c9925f013	1085	LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
donatien	0:632c9925f013	1086	(netif->hwaddr_len == ETHARP_HWADDR_LEN));
donatien	0:632c9925f013	1087	k = ETHARP_HWADDR_LEN;
donatien	0:632c9925f013	1088	#if LWIP_AUTOIP
donatien	0:632c9925f013	1089	/* If we are using Link-Local, all ARP packets that contain a Link-Local
donatien	0:632c9925f013	1090	* 'sender IP address' MUST be sent using link-layer broadcast instead of
donatien	0:632c9925f013	1091	* link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
donatien	0:632c9925f013	1092	ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
donatien	0:632c9925f013	1093	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	1094	/* Write MAC-Addresses (combined loop for both headers) */
donatien	0:632c9925f013	1095	while(k > 0) {
donatien	0:632c9925f013	1096	k--;
donatien	0:632c9925f013	1097	/* Write the ARP MAC-Addresses */
donatien	0:632c9925f013	1098	hdr->shwaddr.addr[k] = hwsrc_addr->addr[k];
donatien	0:632c9925f013	1099	hdr->dhwaddr.addr[k] = hwdst_addr->addr[k];
donatien	0:632c9925f013	1100	/* Write the Ethernet MAC-Addresses */
donatien	0:632c9925f013	1101	#if LWIP_AUTOIP
donatien	0:632c9925f013	1102	ethhdr->dest.addr[k] = ethdst_hwaddr[k];
donatien	0:632c9925f013	1103	#else /* LWIP_AUTOIP */
donatien	0:632c9925f013	1104	ethhdr->dest.addr[k] = ethdst_addr->addr[k];
donatien	0:632c9925f013	1105	#endif /* LWIP_AUTOIP */
donatien	0:632c9925f013	1106	ethhdr->src.addr[k] = ethsrc_addr->addr[k];
donatien	0:632c9925f013	1107	}
donatien	0:632c9925f013	1108	/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
donatien	0:632c9925f013	1109	* structure packing. */
donatien	0:632c9925f013	1110	SMEMCPY(&hdr->sipaddr, ipsrc_addr, sizeof(ip_addr_t));
donatien	0:632c9925f013	1111	SMEMCPY(&hdr->dipaddr, ipdst_addr, sizeof(ip_addr_t));
donatien	0:632c9925f013	1112
donatien	0:632c9925f013	1113	hdr->hwtype = htons(HWTYPE_ETHERNET);
donatien	0:632c9925f013	1114	hdr->proto = htons(ETHTYPE_IP);
donatien	0:632c9925f013	1115	/* set hwlen and protolen together */
donatien	0:632c9925f013	1116	hdr->_hwlen_protolen = htons((ETHARP_HWADDR_LEN << 8) \| sizeof(ip_addr_t));
donatien	0:632c9925f013	1117
donatien	0:632c9925f013	1118	ethhdr->type = htons(ETHTYPE_ARP);
donatien	0:632c9925f013	1119	/* send ARP query */
donatien	0:632c9925f013	1120	result = netif->linkoutput(netif, p);
donatien	0:632c9925f013	1121	ETHARP_STATS_INC(etharp.xmit);
donatien	0:632c9925f013	1122	/* free ARP query packet */
donatien	0:632c9925f013	1123	pbuf_free(p);
donatien	0:632c9925f013	1124	p = NULL;
donatien	0:632c9925f013	1125	/* could not allocate pbuf for ARP request */
donatien	0:632c9925f013	1126
donatien	0:632c9925f013	1127	return result;
donatien	0:632c9925f013	1128	}
donatien	0:632c9925f013	1129
donatien	0:632c9925f013	1130	/**
donatien	0:632c9925f013	1131	* Send an ARP request packet asking for ipaddr.
donatien	0:632c9925f013	1132	*
donatien	0:632c9925f013	1133	* @param netif the lwip network interface on which to send the request
donatien	0:632c9925f013	1134	* @param ipaddr the IP address for which to ask
donatien	0:632c9925f013	1135	* @return ERR_OK if the request has been sent
donatien	0:632c9925f013	1136	* ERR_MEM if the ARP packet couldn't be allocated
donatien	0:632c9925f013	1137	* any other err_t on failure
donatien	0:632c9925f013	1138	*/
donatien	0:632c9925f013	1139	err_t
donatien	0:632c9925f013	1140	etharp_request(struct netif netif, ip_addr_t ipaddr)
donatien	0:632c9925f013	1141	{
donatien	0:632c9925f013	1142	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
donatien	0:632c9925f013	1143	return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
donatien	0:632c9925f013	1144	(struct eth_addr *)netif->hwaddr, &netif->ip_addr, &ethzero,
donatien	0:632c9925f013	1145	ipaddr, ARP_REQUEST);
donatien	0:632c9925f013	1146	}
donatien	0:632c9925f013	1147	#endif /* LWIP_ARP */
donatien	0:632c9925f013	1148
donatien	0:632c9925f013	1149	/**
donatien	0:632c9925f013	1150	* Process received ethernet frames. Using this function instead of directly
donatien	0:632c9925f013	1151	* calling ip_input and passing ARP frames through etharp in ethernetif_input,
donatien	0:632c9925f013	1152	* the ARP cache is protected from concurrent access.
donatien	0:632c9925f013	1153	*
donatien	0:632c9925f013	1154	* @param p the recevied packet, p->payload pointing to the ethernet header
donatien	0:632c9925f013	1155	* @param netif the network interface on which the packet was received
donatien	0:632c9925f013	1156	*/
donatien	0:632c9925f013	1157	err_t
donatien	0:632c9925f013	1158	ethernet_input(struct pbuf p, struct netif netif)
donatien	0:632c9925f013	1159	{
donatien	0:632c9925f013	1160	struct eth_hdr* ethhdr;
donatien	0:632c9925f013	1161	u16_t type;
donatien	0:632c9925f013	1162
donatien	0:632c9925f013	1163	/* points to packet payload, which starts with an Ethernet header */
donatien	0:632c9925f013	1164	ethhdr = (struct eth_hdr *)p->payload;
donatien	0:632c9925f013	1165	LWIP_DEBUGF(ETHARP_DEBUG \| LWIP_DBG_TRACE,
donatien	0:632c9925f013	1166	("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
donatien	0:632c9925f013	1167	(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
donatien	0:632c9925f013	1168	(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
donatien	0:632c9925f013	1169	(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
donatien	0:632c9925f013	1170	(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
donatien	0:632c9925f013	1171	(unsigned)htons(ethhdr->type)));
donatien	0:632c9925f013	1172
donatien	0:632c9925f013	1173	type = htons(ethhdr->type);
donatien	0:632c9925f013	1174	#if ETHARP_SUPPORT_VLAN
donatien	0:632c9925f013	1175	if (type == ETHTYPE_VLAN) {
donatien	0:632c9925f013	1176	struct eth_vlan_hdr vlan = (struct eth_vlan_hdr)(((char*)ethhdr) + SIZEOF_ETH_HDR);
donatien	0:632c9925f013	1177	#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
donatien	0:632c9925f013	1178	if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
donatien	0:632c9925f013	1179	/* silently ignore this packet: not for our VLAN */
donatien	0:632c9925f013	1180	pbuf_free(p);
donatien	0:632c9925f013	1181	return ERR_OK;
donatien	0:632c9925f013	1182	}
donatien	0:632c9925f013	1183	#endif /* ETHARP_VLAN_CHECK */
donatien	0:632c9925f013	1184	type = htons(vlan->tpid);
donatien	0:632c9925f013	1185	}
donatien	0:632c9925f013	1186	#endif /* ETHARP_SUPPORT_VLAN */
donatien	0:632c9925f013	1187
donatien	0:632c9925f013	1188	switch (type) {
donatien	0:632c9925f013	1189	#if LWIP_ARP
donatien	0:632c9925f013	1190	/* IP packet? */
donatien	0:632c9925f013	1191	case ETHTYPE_IP:
donatien	0:632c9925f013	1192	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
donatien	0:632c9925f013	1193	goto free_and_return;
donatien	0:632c9925f013	1194	}
donatien	0:632c9925f013	1195	#if ETHARP_TRUST_IP_MAC
donatien	0:632c9925f013	1196	/* update ARP table */
donatien	0:632c9925f013	1197	etharp_ip_input(netif, p);
donatien	0:632c9925f013	1198	#endif /* ETHARP_TRUST_IP_MAC */
donatien	0:632c9925f013	1199	/* skip Ethernet header */
donatien	0:632c9925f013	1200	if(pbuf_header(p, -(s16_t)SIZEOF_ETH_HDR)) {
donatien	0:632c9925f013	1201	LWIP_ASSERT("Can't move over header in packet", 0);
donatien	0:632c9925f013	1202	goto free_and_return;
donatien	0:632c9925f013	1203	} else {
donatien	0:632c9925f013	1204	/* pass to IP layer */
donatien	0:632c9925f013	1205	ip_input(p, netif);
donatien	0:632c9925f013	1206	}
donatien	0:632c9925f013	1207	break;
donatien	0:632c9925f013	1208
donatien	0:632c9925f013	1209	case ETHTYPE_ARP:
donatien	0:632c9925f013	1210	if (!(netif->flags & NETIF_FLAG_ETHARP)) {
donatien	0:632c9925f013	1211	goto free_and_return;
donatien	0:632c9925f013	1212	}
donatien	0:632c9925f013	1213	/* pass p to ARP module */
donatien	0:632c9925f013	1214	etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
donatien	0:632c9925f013	1215	break;
donatien	0:632c9925f013	1216	#endif /* LWIP_ARP */
donatien	0:632c9925f013	1217	#if PPPOE_SUPPORT
donatien	0:632c9925f013	1218	case ETHTYPE_PPPOEDISC: /* PPP Over Ethernet Discovery Stage */
donatien	0:632c9925f013	1219	pppoe_disc_input(netif, p);
donatien	0:632c9925f013	1220	break;
donatien	0:632c9925f013	1221
donatien	0:632c9925f013	1222	case ETHTYPE_PPPOE: /* PPP Over Ethernet Session Stage */
donatien	0:632c9925f013	1223	pppoe_data_input(netif, p);
donatien	0:632c9925f013	1224	break;
donatien	0:632c9925f013	1225	#endif /* PPPOE_SUPPORT */
donatien	0:632c9925f013	1226
donatien	0:632c9925f013	1227	default:
donatien	0:632c9925f013	1228	ETHARP_STATS_INC(etharp.proterr);
donatien	0:632c9925f013	1229	ETHARP_STATS_INC(etharp.drop);
donatien	0:632c9925f013	1230	goto free_and_return;
donatien	0:632c9925f013	1231	}
donatien	0:632c9925f013	1232
donatien	0:632c9925f013	1233	/* This means the pbuf is freed or consumed,
donatien	0:632c9925f013	1234	so the caller doesn't have to free it again */
donatien	0:632c9925f013	1235	return ERR_OK;
donatien	0:632c9925f013	1236
donatien	0:632c9925f013	1237	free_and_return:
donatien	0:632c9925f013	1238	pbuf_free(p);
donatien	0:632c9925f013	1239	return ERR_OK;
donatien	0:632c9925f013	1240	}
donatien	0:632c9925f013	1241	#endif /* LWIP_ARP \|\| LWIP_ETHERNET */

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

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lwip/netif/etharp.c@0:632c9925f013, 2010-06-11 (annotated)

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