Bonjour - First step: AutoIP compiled in and working

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Darran Shepherd / Mbed 2 deprecated Bonjour

First step: AutoIP compiled in and working

lwip/netif/ethernetif.c@1:4218cacaf696, 2010-06-18 (annotated)

Committer:: darran
Date:: Fri Jun 18 15:54:21 2010 +0000
Revision:: 1:4218cacaf696
Parent:: 0:55a05330f8cc

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:55a05330f8cc	1	/**
darran	0:55a05330f8cc	2	* @file
darran	0:55a05330f8cc	3	* Ethernet Interface Skeleton
darran	0:55a05330f8cc	4	*
darran	0:55a05330f8cc	5	*/
darran	0:55a05330f8cc	6
darran	0:55a05330f8cc	7	/*
darran	0:55a05330f8cc	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
darran	0:55a05330f8cc	9	* All rights reserved.
darran	0:55a05330f8cc	10	*
darran	0:55a05330f8cc	11	* Redistribution and use in source and binary forms, with or without modification,
darran	0:55a05330f8cc	12	* are permitted provided that the following conditions are met:
darran	0:55a05330f8cc	13	*
darran	0:55a05330f8cc	14	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:55a05330f8cc	15	* this list of conditions and the following disclaimer.
darran	0:55a05330f8cc	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:55a05330f8cc	17	* this list of conditions and the following disclaimer in the documentation
darran	0:55a05330f8cc	18	* and/or other materials provided with the distribution.
darran	0:55a05330f8cc	19	* 3. The name of the author may not be used to endorse or promote products
darran	0:55a05330f8cc	20	* derived from this software without specific prior written permission.
darran	0:55a05330f8cc	21	*
darran	0:55a05330f8cc	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:55a05330f8cc	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:55a05330f8cc	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:55a05330f8cc	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:55a05330f8cc	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:55a05330f8cc	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:55a05330f8cc	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:55a05330f8cc	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:55a05330f8cc	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:55a05330f8cc	31	* OF SUCH DAMAGE.
darran	0:55a05330f8cc	32	*
darran	0:55a05330f8cc	33	* This file is part of the lwIP TCP/IP stack.
darran	0:55a05330f8cc	34	*
darran	0:55a05330f8cc	35	* Author: Adam Dunkels <adam@sics.se>
darran	0:55a05330f8cc	36	*
darran	0:55a05330f8cc	37	*/
darran	0:55a05330f8cc	38
darran	0:55a05330f8cc	39	/*
darran	0:55a05330f8cc	40	* This file is a skeleton for developing Ethernet network interface
darran	0:55a05330f8cc	41	* drivers for lwIP. Add code to the low_level functions and do a
darran	0:55a05330f8cc	42	* search-and-replace for the word "ethernetif" to replace it with
darran	0:55a05330f8cc	43	* something that better describes your network interface.
darran	0:55a05330f8cc	44	*/
darran	0:55a05330f8cc	45
darran	0:55a05330f8cc	46	#include "lwip/opt.h"
darran	0:55a05330f8cc	47
darran	0:55a05330f8cc	48	#if 0 /* don't build, this is only a skeleton, see previous comment */
darran	0:55a05330f8cc	49
darran	0:55a05330f8cc	50	#include "lwip/def.h"
darran	0:55a05330f8cc	51	#include "lwip/mem.h"
darran	0:55a05330f8cc	52	#include "lwip/pbuf.h"
darran	0:55a05330f8cc	53	#include "lwip/sys.h"
darran	0:55a05330f8cc	54	#include <lwip/stats.h>
darran	0:55a05330f8cc	55	#include <lwip/snmp.h>
darran	0:55a05330f8cc	56	#include "netif/etharp.h"
darran	0:55a05330f8cc	57	#include "netif/ppp_oe.h"
darran	0:55a05330f8cc	58
darran	0:55a05330f8cc	59	/* Define those to better describe your network interface. */
darran	0:55a05330f8cc	60	#define IFNAME0 'e'
darran	0:55a05330f8cc	61	#define IFNAME1 'n'
darran	0:55a05330f8cc	62
darran	0:55a05330f8cc	63	/**
darran	0:55a05330f8cc	64	* Helper struct to hold private data used to operate your ethernet interface.
darran	0:55a05330f8cc	65	* Keeping the ethernet address of the MAC in this struct is not necessary
darran	0:55a05330f8cc	66	* as it is already kept in the struct netif.
darran	0:55a05330f8cc	67	* But this is only an example, anyway...
darran	0:55a05330f8cc	68	*/
darran	0:55a05330f8cc	69	struct ethernetif {
darran	0:55a05330f8cc	70	struct eth_addr *ethaddr;
darran	0:55a05330f8cc	71	/* Add whatever per-interface state that is needed here. */
darran	0:55a05330f8cc	72	};
darran	0:55a05330f8cc	73
darran	0:55a05330f8cc	74	/* Forward declarations. */
darran	0:55a05330f8cc	75	static void ethernetif_input(struct netif *netif);
darran	0:55a05330f8cc	76
darran	0:55a05330f8cc	77	/**
darran	0:55a05330f8cc	78	* In this function, the hardware should be initialized.
darran	0:55a05330f8cc	79	* Called from ethernetif_init().
darran	0:55a05330f8cc	80	*
darran	0:55a05330f8cc	81	* @param netif the already initialized lwip network interface structure
darran	0:55a05330f8cc	82	* for this ethernetif
darran	0:55a05330f8cc	83	*/
darran	0:55a05330f8cc	84	static void
darran	0:55a05330f8cc	85	low_level_init(struct netif *netif)
darran	0:55a05330f8cc	86	{
darran	0:55a05330f8cc	87	struct ethernetif *ethernetif = netif->state;
darran	0:55a05330f8cc	88
darran	0:55a05330f8cc	89	/* set MAC hardware address length */
darran	0:55a05330f8cc	90	netif->hwaddr_len = ETHARP_HWADDR_LEN;
darran	0:55a05330f8cc	91
darran	0:55a05330f8cc	92	/* set MAC hardware address */
darran	0:55a05330f8cc	93	netif->hwaddr[0] = ;
darran	0:55a05330f8cc	94	...
darran	0:55a05330f8cc	95	netif->hwaddr[5] = ;
darran	0:55a05330f8cc	96
darran	0:55a05330f8cc	97	/* maximum transfer unit */
darran	0:55a05330f8cc	98	netif->mtu = 1500;
darran	0:55a05330f8cc	99
darran	0:55a05330f8cc	100	/* device capabilities */
darran	0:55a05330f8cc	101	/* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
darran	0:55a05330f8cc	102	netif->flags = NETIF_FLAG_BROADCAST \| NETIF_FLAG_ETHARP \| NETIF_FLAG_LINK_UP;
darran	0:55a05330f8cc	103
darran	0:55a05330f8cc	104	/* Do whatever else is needed to initialize interface. */
darran	0:55a05330f8cc	105	}
darran	0:55a05330f8cc	106
darran	0:55a05330f8cc	107	/**
darran	0:55a05330f8cc	108	* This function should do the actual transmission of the packet. The packet is
darran	0:55a05330f8cc	109	* contained in the pbuf that is passed to the function. This pbuf
darran	0:55a05330f8cc	110	* might be chained.
darran	0:55a05330f8cc	111	*
darran	0:55a05330f8cc	112	* @param netif the lwip network interface structure for this ethernetif
darran	0:55a05330f8cc	113	* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
darran	0:55a05330f8cc	114	* @return ERR_OK if the packet could be sent
darran	0:55a05330f8cc	115	* an err_t value if the packet couldn't be sent
darran	0:55a05330f8cc	116	*
darran	0:55a05330f8cc	117	* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
darran	0:55a05330f8cc	118	* strange results. You might consider waiting for space in the DMA queue
darran	0:55a05330f8cc	119	* to become availale since the stack doesn't retry to send a packet
darran	0:55a05330f8cc	120	* dropped because of memory failure (except for the TCP timers).
darran	0:55a05330f8cc	121	*/
darran	0:55a05330f8cc	122
darran	0:55a05330f8cc	123	static err_t
darran	0:55a05330f8cc	124	low_level_output(struct netif netif, struct pbuf p)
darran	0:55a05330f8cc	125	{
darran	0:55a05330f8cc	126	struct ethernetif *ethernetif = netif->state;
darran	0:55a05330f8cc	127	struct pbuf *q;
darran	0:55a05330f8cc	128
darran	0:55a05330f8cc	129	initiate transfer();
darran	0:55a05330f8cc	130
darran	0:55a05330f8cc	131	#if ETH_PAD_SIZE
darran	0:55a05330f8cc	132	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
darran	0:55a05330f8cc	133	#endif
darran	0:55a05330f8cc	134
darran	0:55a05330f8cc	135	for(q = p; q != NULL; q = q->next) {
darran	0:55a05330f8cc	136	/* Send the data from the pbuf to the interface, one pbuf at a
darran	0:55a05330f8cc	137	time. The size of the data in each pbuf is kept in the ->len
darran	0:55a05330f8cc	138	variable. */
darran	0:55a05330f8cc	139	send data from(q->payload, q->len);
darran	0:55a05330f8cc	140	}
darran	0:55a05330f8cc	141
darran	0:55a05330f8cc	142	signal that packet should be sent();
darran	0:55a05330f8cc	143
darran	0:55a05330f8cc	144	#if ETH_PAD_SIZE
darran	0:55a05330f8cc	145	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
darran	0:55a05330f8cc	146	#endif
darran	0:55a05330f8cc	147
darran	0:55a05330f8cc	148	LINK_STATS_INC(link.xmit);
darran	0:55a05330f8cc	149
darran	0:55a05330f8cc	150	return ERR_OK;
darran	0:55a05330f8cc	151	}
darran	0:55a05330f8cc	152
darran	0:55a05330f8cc	153	/**
darran	0:55a05330f8cc	154	* Should allocate a pbuf and transfer the bytes of the incoming
darran	0:55a05330f8cc	155	* packet from the interface into the pbuf.
darran	0:55a05330f8cc	156	*
darran	0:55a05330f8cc	157	* @param netif the lwip network interface structure for this ethernetif
darran	0:55a05330f8cc	158	* @return a pbuf filled with the received packet (including MAC header)
darran	0:55a05330f8cc	159	* NULL on memory error
darran	0:55a05330f8cc	160	*/
darran	0:55a05330f8cc	161	static struct pbuf *
darran	0:55a05330f8cc	162	low_level_input(struct netif *netif)
darran	0:55a05330f8cc	163	{
darran	0:55a05330f8cc	164	struct ethernetif *ethernetif = netif->state;
darran	0:55a05330f8cc	165	struct pbuf p, q;
darran	0:55a05330f8cc	166	u16_t len;
darran	0:55a05330f8cc	167
darran	0:55a05330f8cc	168	/* Obtain the size of the packet and put it into the "len"
darran	0:55a05330f8cc	169	variable. */
darran	0:55a05330f8cc	170	len = ;
darran	0:55a05330f8cc	171
darran	0:55a05330f8cc	172	#if ETH_PAD_SIZE
darran	0:55a05330f8cc	173	len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
darran	0:55a05330f8cc	174	#endif
darran	0:55a05330f8cc	175
darran	0:55a05330f8cc	176	/* We allocate a pbuf chain of pbufs from the pool. */
darran	0:55a05330f8cc	177	p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
darran	0:55a05330f8cc	178
darran	0:55a05330f8cc	179	if (p != NULL) {
darran	0:55a05330f8cc	180
darran	0:55a05330f8cc	181	#if ETH_PAD_SIZE
darran	0:55a05330f8cc	182	pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
darran	0:55a05330f8cc	183	#endif
darran	0:55a05330f8cc	184
darran	0:55a05330f8cc	185	/* We iterate over the pbuf chain until we have read the entire
darran	0:55a05330f8cc	186	* packet into the pbuf. */
darran	0:55a05330f8cc	187	for(q = p; q != NULL; q = q->next) {
darran	0:55a05330f8cc	188	/* Read enough bytes to fill this pbuf in the chain. The
darran	0:55a05330f8cc	189	* available data in the pbuf is given by the q->len
darran	0:55a05330f8cc	190	* variable.
darran	0:55a05330f8cc	191	* This does not necessarily have to be a memcpy, you can also preallocate
darran	0:55a05330f8cc	192	* pbufs for a DMA-enabled MAC and after receiving truncate it to the
darran	0:55a05330f8cc	193	* actually received size. In this case, ensure the tot_len member of the
darran	0:55a05330f8cc	194	* pbuf is the sum of the chained pbuf len members.
darran	0:55a05330f8cc	195	*/
darran	0:55a05330f8cc	196	read data into(q->payload, q->len);
darran	0:55a05330f8cc	197	}
darran	0:55a05330f8cc	198	acknowledge that packet has been read();
darran	0:55a05330f8cc	199
darran	0:55a05330f8cc	200	#if ETH_PAD_SIZE
darran	0:55a05330f8cc	201	pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
darran	0:55a05330f8cc	202	#endif
darran	0:55a05330f8cc	203
darran	0:55a05330f8cc	204	LINK_STATS_INC(link.recv);
darran	0:55a05330f8cc	205	} else {
darran	0:55a05330f8cc	206	drop packet();
darran	0:55a05330f8cc	207	LINK_STATS_INC(link.memerr);
darran	0:55a05330f8cc	208	LINK_STATS_INC(link.drop);
darran	0:55a05330f8cc	209	}
darran	0:55a05330f8cc	210
darran	0:55a05330f8cc	211	return p;
darran	0:55a05330f8cc	212	}
darran	0:55a05330f8cc	213
darran	0:55a05330f8cc	214	/**
darran	0:55a05330f8cc	215	* This function should be called when a packet is ready to be read
darran	0:55a05330f8cc	216	* from the interface. It uses the function low_level_input() that
darran	0:55a05330f8cc	217	* should handle the actual reception of bytes from the network
darran	0:55a05330f8cc	218	* interface. Then the type of the received packet is determined and
darran	0:55a05330f8cc	219	* the appropriate input function is called.
darran	0:55a05330f8cc	220	*
darran	0:55a05330f8cc	221	* @param netif the lwip network interface structure for this ethernetif
darran	0:55a05330f8cc	222	*/
darran	0:55a05330f8cc	223	static void
darran	0:55a05330f8cc	224	ethernetif_input(struct netif *netif)
darran	0:55a05330f8cc	225	{
darran	0:55a05330f8cc	226	struct ethernetif *ethernetif;
darran	0:55a05330f8cc	227	struct eth_hdr *ethhdr;
darran	0:55a05330f8cc	228	struct pbuf *p;
darran	0:55a05330f8cc	229
darran	0:55a05330f8cc	230	ethernetif = netif->state;
darran	0:55a05330f8cc	231
darran	0:55a05330f8cc	232	/* move received packet into a new pbuf */
darran	0:55a05330f8cc	233	p = low_level_input(netif);
darran	0:55a05330f8cc	234	/* no packet could be read, silently ignore this */
darran	0:55a05330f8cc	235	if (p == NULL) return;
darran	0:55a05330f8cc	236	/* points to packet payload, which starts with an Ethernet header */
darran	0:55a05330f8cc	237	ethhdr = p->payload;
darran	0:55a05330f8cc	238
darran	0:55a05330f8cc	239	switch (htons(ethhdr->type)) {
darran	0:55a05330f8cc	240	/* IP or ARP packet? */
darran	0:55a05330f8cc	241	case ETHTYPE_IP:
darran	0:55a05330f8cc	242	case ETHTYPE_ARP:
darran	0:55a05330f8cc	243	#if PPPOE_SUPPORT
darran	0:55a05330f8cc	244	/* PPPoE packet? */
darran	0:55a05330f8cc	245	case ETHTYPE_PPPOEDISC:
darran	0:55a05330f8cc	246	case ETHTYPE_PPPOE:
darran	0:55a05330f8cc	247	#endif /* PPPOE_SUPPORT */
darran	0:55a05330f8cc	248	/* full packet send to tcpip_thread to process */
darran	0:55a05330f8cc	249	if (netif->input(p, netif)!=ERR_OK)
darran	0:55a05330f8cc	250	{ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
darran	0:55a05330f8cc	251	pbuf_free(p);
darran	0:55a05330f8cc	252	p = NULL;
darran	0:55a05330f8cc	253	}
darran	0:55a05330f8cc	254	break;
darran	0:55a05330f8cc	255
darran	0:55a05330f8cc	256	default:
darran	0:55a05330f8cc	257	pbuf_free(p);
darran	0:55a05330f8cc	258	p = NULL;
darran	0:55a05330f8cc	259	break;
darran	0:55a05330f8cc	260	}
darran	0:55a05330f8cc	261	}
darran	0:55a05330f8cc	262
darran	0:55a05330f8cc	263	/**
darran	0:55a05330f8cc	264	* Should be called at the beginning of the program to set up the
darran	0:55a05330f8cc	265	* network interface. It calls the function low_level_init() to do the
darran	0:55a05330f8cc	266	* actual setup of the hardware.
darran	0:55a05330f8cc	267	*
darran	0:55a05330f8cc	268	* This function should be passed as a parameter to netif_add().
darran	0:55a05330f8cc	269	*
darran	0:55a05330f8cc	270	* @param netif the lwip network interface structure for this ethernetif
darran	0:55a05330f8cc	271	* @return ERR_OK if the loopif is initialized
darran	0:55a05330f8cc	272	* ERR_MEM if private data couldn't be allocated
darran	0:55a05330f8cc	273	* any other err_t on error
darran	0:55a05330f8cc	274	*/
darran	0:55a05330f8cc	275	err_t
darran	0:55a05330f8cc	276	ethernetif_init(struct netif *netif)
darran	0:55a05330f8cc	277	{
darran	0:55a05330f8cc	278	struct ethernetif *ethernetif;
darran	0:55a05330f8cc	279
darran	0:55a05330f8cc	280	LWIP_ASSERT("netif != NULL", (netif != NULL));
darran	0:55a05330f8cc	281
darran	0:55a05330f8cc	282	ethernetif = mem_malloc(sizeof(struct ethernetif));
darran	0:55a05330f8cc	283	if (ethernetif == NULL) {
darran	0:55a05330f8cc	284	LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
darran	0:55a05330f8cc	285	return ERR_MEM;
darran	0:55a05330f8cc	286	}
darran	0:55a05330f8cc	287
darran	0:55a05330f8cc	288	#if LWIP_NETIF_HOSTNAME
darran	0:55a05330f8cc	289	/* Initialize interface hostname */
darran	0:55a05330f8cc	290	netif->hostname = "lwip";
darran	0:55a05330f8cc	291	#endif /* LWIP_NETIF_HOSTNAME */
darran	0:55a05330f8cc	292
darran	0:55a05330f8cc	293	/*
darran	0:55a05330f8cc	294	* Initialize the snmp variables and counters inside the struct netif.
darran	0:55a05330f8cc	295	* The last argument should be replaced with your link speed, in units
darran	0:55a05330f8cc	296	* of bits per second.
darran	0:55a05330f8cc	297	*/
darran	0:55a05330f8cc	298	NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
darran	0:55a05330f8cc	299
darran	0:55a05330f8cc	300	netif->state = ethernetif;
darran	0:55a05330f8cc	301	netif->name[0] = IFNAME0;
darran	0:55a05330f8cc	302	netif->name[1] = IFNAME1;
darran	0:55a05330f8cc	303	/* We directly use etharp_output() here to save a function call.
darran	0:55a05330f8cc	304	* You can instead declare your own function an call etharp_output()
darran	0:55a05330f8cc	305	* from it if you have to do some checks before sending (e.g. if link
darran	0:55a05330f8cc	306	* is available...) */
darran	0:55a05330f8cc	307	netif->output = etharp_output;
darran	0:55a05330f8cc	308	netif->linkoutput = low_level_output;
darran	0:55a05330f8cc	309
darran	0:55a05330f8cc	310	ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
darran	0:55a05330f8cc	311
darran	0:55a05330f8cc	312	/* initialize the hardware */
darran	0:55a05330f8cc	313	low_level_init(netif);
darran	0:55a05330f8cc	314
darran	0:55a05330f8cc	315	return ERR_OK;
darran	0:55a05330f8cc	316	}
darran	0:55a05330f8cc	317
darran	0:55a05330f8cc	318	#endif /* 0 */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Jun 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

lwip/netif/ethernetif.c@1:4218cacaf696, 2010-06-18 (annotated)

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