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Contrib module by Dominik Spies: autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h: AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt (see TODO mark in the source code).

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This commit is contained in:
fbernon 2007-06-09 16:57:04 +00:00
parent 792f5b3f22
commit e01f342048
10 changed files with 639 additions and 12 deletions
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6
CHANGELOG
View File

@ -19,6 +19,12 @@ HISTORY
++ New features:
2007-06-09 Dominik Spies (integrated by Frédéric Bernon)
* autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h:
AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and
LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt
(see TODO mark in the source code).
2007-06-09 Simon Goldschmidt
* etharp.h, etharp.c, ethernetif.c: Modified order of parameters for
etharp_output() to match netif->output so etharp_output() can be used

11
src/core/dhcp.c
View File

@ -538,6 +538,10 @@ err_t dhcp_start(struct netif *netif)
struct dhcp *dhcp = netif->dhcp;
err_t result = ERR_OK;
#if LWIP_DHCP_AUTOIP_COOP
autoip_init();
#endif /* LWIP_DHCP_AUTOIP_COOP */
LWIP_ASSERT("netif != NULL", netif != NULL);
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
netif->flags &= ~NETIF_FLAG_DHCP;
@ -766,6 +770,13 @@ static err_t dhcp_discover(struct netif *netif)
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_discover: could not allocate DHCP request\n"));
}
dhcp->tries++;
#if LWIP_DHCP_AUTOIP_COOP
/* that means we waited 57 seconds */
if(dhcp->tries >= 9 && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
autoip_start(netif);
}
#endif /* LWIP_DHCP_AUTOIP_COOP */
msecs = dhcp->tries < 4 ? (dhcp->tries + 1) * 1000 : 10 * 1000;
dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));

374
src/core/ipv4/autoip.c Normal file
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@ -0,0 +1,374 @@
/**
* @file
*
* AutoIP Automatic LinkLocal IP Configuration
*/
/*
*
* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Dominik Spies <kontakt@dspies.de>
*
* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
* with RFC 3927.
*
*
* Please coordinate changes and requests with Dominik Spies
* <kontakt@dspies.de>
*/
#include <stdlib.h>
#include <string.h>
#include "lwip/mem.h"
#include "lwip/udp.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/autoip.h"
#include "netif/etharp.h"
#if LWIP_AUTOIP /* don't build if not configured for use in lwipopt.h */
/* static functions */
static void autoip_handle_arp_conflict(struct netif *netif);
/* creates random LL IP-Address */
static void autoip_create_rand_addr(struct ip_addr *RandomIPAddr);
/* sends an ARP announce */
static err_t autoip_arp_announce(struct netif *netif);
/* configure interface for use with current LL IP-Address */
static err_t autoip_bind(struct netif *netif);
/**
* Initialize this module
* seed random with MAC-Address for creating pseudo-ramdom linc-local address
*/
void
autoip_init(void)
{
/* TODO MAC_ADDRESS macaddr; */
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | 3, ("autoip_init()\n"));
/* TODO Get_Current_MAC_Address(&macaddr);*/
/*srand(
(macaddr.addr[2] << 24) |
(macaddr.addr[3] << 16) |
(macaddr.addr[4] << 8) |
(macaddr.addr[5] << 0)
);*/
}
/**
* TODO: Add comment
*/
static void
autoip_handle_arp_conflict(struct netif *netif)
{
/* Somehow detect if we are defending or retreating */
unsigned char defend = 1; // tbd
if(defend) {
if(netif->autoip->lastconflict > 0) {
/* retreat, there was a conflicting ARP in the last
* DEFEND_INTERVAL seconds
*/
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | DBG_STATE | 1, ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
/* TODO: close all TCP sessions */
autoip_start(netif);
} else {
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | DBG_STATE | 1, ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
autoip_arp_announce(netif);
netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_FINE_TIMER_TICK_PER_SECOND;
}
} else {
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | DBG_STATE | 1, ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
/* TODO: close all TCP sessions */
autoip_start(netif);
}
}
/**
* TODO: Add comment
*/
static void
autoip_create_rand_addr(struct ip_addr *RandomIPAddr)
{
/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
* compliant to RFC 3927 Section 2.1
* We have 254 * 256 possibilities
*/
RandomIPAddr->addr = htonl((u32_t)(rand() % (0xA9FEFEFF + 1 - 0xA9FE0100) + 0xA9FE0100));
}
/**
* TODO: Add comment
*/
static err_t
autoip_arp_announce(struct netif *netif)
{
struct eth_addr eth_addr_bc, eth_addr_zero;
u8_t k = netif->hwaddr_len;
while(k > 0) {
k--;
eth_addr_bc.addr[k] = 0xFF;
eth_addr_zero.addr[k] = 0x00;
}
return etharp_raw( netif,
(struct eth_addr *)netif->hwaddr,
&eth_addr_bc,
(struct eth_addr *)netif->hwaddr,
&netif->autoip->llipaddr,
&eth_addr_zero,
&netif->autoip->llipaddr,
ARP_REQUEST
);
}
/**
* TODO: Add comment
*/
static err_t
autoip_bind(struct netif *netif)
{
struct autoip *autoip = netif->autoip;
struct ip_addr sn_mask, gw_addr;
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | 3, ("autoip_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
IP4_ADDR(&sn_mask, 255, 255, 0, 0);
IP4_ADDR(&gw_addr, 0, 0, 0, 0);
netif_set_ipaddr(netif, &autoip->llipaddr);
netif_set_netmask(netif, &sn_mask);
netif_set_gw(netif, &gw_addr);
/* bring the interface up */
netif_set_up(netif);
return ERR_OK;
}
/**
* TODO: Add comment
*/
err_t
autoip_start(struct netif *netif)
{
struct autoip *autoip = netif->autoip;
err_t result = ERR_OK;
if(netif_is_up(netif)) {
netif_set_down(netif);
}
/* Set IP-Address, Netmask and Gateway to 0 to make sure that
* ARP Packets are formed correctly
*/
netif->ip_addr.addr = 0;
netif->netmask.addr = 0;
netif->gw.addr = 0;
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | DBG_STATE, ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
if(autoip == NULL) {
/* no AutoIP client attached yet? */
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE, ("autoip_start(): starting new AUTOIP client\n"));
autoip = mem_malloc(sizeof(struct autoip));
if(autoip == NULL) {
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE, ("autoip_start(): could not allocate autoip\n"));
return ERR_MEM;
}
memset( autoip, 0, sizeof(struct autoip));
/* store this AutoIP client in the netif */
netif->autoip = autoip;
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE, ("autoip_start(): allocated autoip"));
} else {
autoip->state = AUTOIP_STATE_OFF;
autoip->ttw = 0;
autoip->sent_num = 0;
memset(&autoip->llipaddr, 0, sizeof(struct ip_addr));
autoip->lastconflict = 0;
}
autoip_create_rand_addr(&(autoip->llipaddr));
autoip->tried_llipaddr++;
autoip->state = AUTOIP_STATE_PROBING;
autoip->sent_num = 0;
/* time to wait to first probe, this is randomly
* choosen out of 0 to PROBE_WAIT seconds.
* compliant to RFC 3927 Section 2.2.1
*/
autoip->ttw = (rand() % (PROBE_WAIT * AUTOIP_FINE_TIMER_TICK_PER_SECOND));
/*
* if we tried more then MAX_CONFLICTS we must limit our rate for
* accquiring and probing address
* compliant to RFC 3927 Section 2.2.1
*/
if(autoip->tried_llipaddr > MAX_CONFLICTS) {
autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_FINE_TIMER_TICK_PER_SECOND;
}
return result;
}
/**
* TODO: Add comment
*/
err_t
autoip_stop(struct netif *netif)
{
netif->autoip->state = AUTOIP_STATE_OFF;
netif_set_down(netif);
return ERR_OK;
}
/**
* TODO: Add comment
*/
void
autoip_fine_tmr()
{
struct netif *netif = netif_list;
/* loop through netif's */
while (netif != NULL) {
/* only act on AutoIP configured interfaces */
if (netif->autoip != NULL) {
if(netif->autoip->lastconflict > 0) {
netif->autoip->lastconflict--;
}
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | 3, ("autoip_fine_tmr()AutoIP-Sate: %d\n", netif->autoip->state));
switch(netif->autoip->state) {
case AUTOIP_STATE_PROBING:
if(netif->autoip->ttw > 0) {
netif->autoip->ttw--;
} else {
if(netif->autoip->sent_num == PROBE_NUM) {
netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
netif->autoip->sent_num = 0;
netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_FINE_TIMER_TICK_PER_SECOND;
} else {
etharp_request(netif, &(netif->autoip->llipaddr));
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | 3, ("autoip_fine_tmr() PROBING Sent Probe\n"));
netif->autoip->sent_num++;
/* calculate time to wait to next probe */
netif->autoip->ttw = (rand() % ((PROBE_MAX - PROBE_MIN) * AUTOIP_FINE_TIMER_TICK_PER_SECOND) ) + PROBE_MIN * AUTOIP_FINE_TIMER_TICK_PER_SECOND;
}
}
break;
case AUTOIP_STATE_ANNOUNCING:
if(netif->autoip->ttw > 0) {
netif->autoip->ttw--;
} else {
if(netif->autoip->sent_num == 0) {
/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
* Now we can bind to an IP address and use it
*/
autoip_bind(netif);
}
if(netif->autoip->sent_num == ANNOUNCE_NUM) {
netif->autoip->state = AUTOIP_STATE_BOUND;
netif->autoip->sent_num = 0;
netif->autoip->ttw = 0;
} else {
autoip_arp_announce(netif);
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | 3, ("autoip_fine_tmr() ANNOUNCING Sent Announce\n"));
netif->autoip->sent_num++;
netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_FINE_TIMER_TICK_PER_SECOND;
}
}
break;
}
}
/* proceed to next network interface */
netif = netif->next;
}
}
/**
* TODO: Add comment
*/
void
autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
{
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | 3, ("autoip_arp_reply()\n"));
if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
/* when ip.src == llipaddr && hw.src != netif->hwaddr
*
* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
* we have a conflict and must solve it
*/
struct ip_addr sipaddr, dipaddr;
struct eth_addr netifaddr;
netifaddr.addr[0] = netif->hwaddr[0];
netifaddr.addr[1] = netif->hwaddr[1];
netifaddr.addr[2] = netif->hwaddr[2];
netifaddr.addr[3] = netif->hwaddr[3];
netifaddr.addr[4] = netif->hwaddr[4];
netifaddr.addr[5] = netif->hwaddr[5];
/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
* structure packing (not using structure copy which breaks strict-aliasing rules).
*/
memcpy(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
memcpy(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
if (netif->autoip->state == AUTOIP_STATE_PROBING || (netif->autoip->state == AUTOIP_STATE_ANNOUNCING && netif->autoip->sent_num == 0)) {
/* RFC 3927 Section 2.2.1:
* from beginning to after ANNOUNCE_WAIT
* seconds we have a conflict if
* ip.src == llipaddr OR
* ip.dst == llipaddr && hw.src != own hwaddr
*/
if((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) || (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) && !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | DBG_STATE | 1, ("autoip_arp_reply(): Probe Conflict detected\n"));
autoip_start(netif);
}
} else {
/* RFC 3927 Section 2.5:
* in any state we have a conflict if
* ip.src == llipaddr && hw.src != own hwaddr
*/
if(ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) && !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
LWIP_DEBUGF(AUTOIP_DEBUG | DBG_TRACE | DBG_STATE | 1, ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
autoip_handle_arp_conflict(netif);
}
}
}
}
#endif /* LWIP_AUTOIP */

6
src/core/netif.c
View File

@ -92,7 +92,11 @@ netif_add(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
#if LWIP_DHCP
/* netif not under DHCP control by default */
netif->dhcp = NULL;
#endif
#endif /* LWIP_DHCP */
#if LWIP_AUTOIP
/* netif not under AutoIP control by default */
netif->autoip = NULL;
#endif /* LWIP_AUTOIP */
#if LWIP_NETIF_CALLBACK
netif->status_callback = NULL;
#endif /* LWIP_NETIF_CALLBACK */

100
src/include/ipv4/lwip/autoip.h Normal file
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@ -0,0 +1,100 @@
/**
* @file
*
* AutoIP Automatic LinkLocal IP Configuration
*/
/*
*
* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Dominik Spies <kontakt@dspies.de>
*
* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
* with RFC 3927.
*
*
* Please coordinate changes and requests with Dominik Spies
* <kontakt@dspies.de>
*/
#ifndef __LWIP_AUTOIP_H__
#define __LWIP_AUTOIP_H__
#include "lwip/opt.h"
#include "lwip/netif.h"
#include "lwip/udp.h"
#include "netif/etharp.h"
/* AutoIP Timing */
#define AUTOIP_FINE_TIMER_MSECS 100
#define AUTOIP_FINE_TIMER_TICK_PER_SECOND 1000 / AUTOIP_FINE_TIMER_MSECS
/* RFC 3927 Constants */
#define PROBE_WAIT 1 /* second (initial random delay) */
#define PROBE_MIN 1 /* second (minimum delay till repeated probe) */
#define PROBE_MAX 2 /* seconds (maximum delay till repeated probe) */
#define PROBE_NUM 3 /* (number of probe packets) */
#define ANNOUNCE_NUM 2 /* (number of announcement packets) */
#define ANNOUNCE_INTERVAL 2 /* seconds (time between announcement packets) */
#define ANNOUNCE_WAIT 2 /* seconds (delay before announcing) */
#define MAX_CONFLICTS 10 /* (max conflicts before rate limiting) */
#define RATE_LIMIT_INTERVAL 60 /* seconds (delay between successive attempts) */
#define DEFEND_INTERVAL 10 /* seconds (min. wait between defensive ARPs) */
/* AutoIP client states */
#define AUTOIP_STATE_OFF 0
#define AUTOIP_STATE_PROBING 1
#define AUTOIP_STATE_ANNOUNCING 2
#define AUTOIP_STATE_BOUND 3
struct autoip
{
u8_t state; /* current AutoIP state machine state */
u8_t sent_num; /* sent number of probes or announces, dependent on state */
u16_t ttw; /* ticks to wait, tick is AUTOIP_FINE_TIMER_MSECS long */
u8_t lastconflict; /* ticks until a conflict can be solved by defending */
u8_t tried_llipaddr; /* total number of probed/used Link Local IP-Addresses */
struct ip_addr llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
};
/** Init srand, has to be called before entering mainloop */
void autoip_init(void);
/** Start AutoIP client */
err_t autoip_start(struct netif *netif);
/** Stop AutoIP client */
err_t autoip_stop(struct netif *netif);
/** Handles every incoming ARP Packet, called by etharp_arp_input */
void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
/** Has to be called in loop every AUTOIP_FINE_TIMER_MSECS milliseconds */
void autoip_fine_tmr(void);
#endif /* __LWIP_AUTOIP_H__ */

7
src/include/lwip/dhcp.h
View File

@ -57,6 +57,9 @@ struct dhcp
/** Patch #1308
* TODO: See dhcp.c "TODO"s
*/
#if LWIP_DHCP_AUTOIP_COOP
u8_t autoip_coop_state;
#endif
#if 0
struct ip_addr offered_si_addr;
u8_t *boot_file_name;
@ -165,6 +168,10 @@ void dhcp_fine_tmr(void);
/** not yet implemented #define DHCP_RELEASING 11 */
#define DHCP_BACKING_OFF 12
#define DHCP_OFF 13
/** AUTOIP cooperatation flags */
#define DHCP_AUTOIP_COOP_STATE_OFF 0
#define DHCP_AUTOIP_COOP_STATE_ON 1
#define DHCP_BOOTREQUEST 1
#define DHCP_BOOTREPLY 2

7
src/include/lwip/netif.h
View File

@ -43,6 +43,9 @@
#if LWIP_DHCP
# include "lwip/dhcp.h"
#endif
#if LWIP_AUTOIP
# include "lwip/autoip.h"
#endif
#ifdef __cplusplus
extern "C" {
@ -111,6 +114,10 @@ struct netif {
/** the DHCP client state information for this netif */
struct dhcp *dhcp;
#endif /* LWIP_DHCP */
#if LWIP_AUTOIP
/** the AutoIP client state information for this netif */
struct autoip *autoip;
#endif
#if LWIP_NETIF_HOSTNAME
/* the hostname for this netif, NULL is a valid value */
char* hostname;

23
src/include/lwip/opt.h
View File

@ -309,6 +309,15 @@ a lot of data that needs to be copied, this should be set high. */
#define DHCP_DOES_ARP_CHECK 1
#endif
/* ---------- AUTOIP options -------- */
#ifndef LWIP_AUTOIP
#define LWIP_AUTOIP 0
#endif
#ifndef LWIP_DHCP_AUTOIP_COOP
#define LWIP_DHCP_AUTOIP_COOP 0
#endif
/* ---------- SNMP options ---------- */
/** @note UDP must be available for SNMP transport */
#ifndef LWIP_SNMP
@ -803,23 +812,27 @@ a lot of data that needs to be copied, this should be set high. */
#define TCPIP_DEBUG LWIP_DBG_OFF
#endif
#ifndef PPP_DEBUG
#ifndef PPP_DEBUG
#define PPP_DEBUG LWIP_DBG_OFF
#endif
#ifndef SLIP_DEBUG
#ifndef SLIP_DEBUG
#define SLIP_DEBUG LWIP_DBG_OFF
#endif
#ifndef DHCP_DEBUG
#ifndef DHCP_DEBUG
#define DHCP_DEBUG LWIP_DBG_OFF
#endif
#ifndef SNMP_MSG_DEBUG
#ifndef AUTOIP_DEBUG
#define AUTOIP_DEBUG LWIP_DBG_OFF
#endif
#ifndef SNMP_MSG_DEBUG
#define SNMP_MSG_DEBUG LWIP_DBG_OFF
#endif
#ifndef SNMP_MIB_DEBUG
#ifndef SNMP_MIB_DEBUG
#define SNMP_MIB_DEBUG LWIP_DBG_OFF
#endif

10
src/include/netif/etharp.h
View File

@ -118,6 +118,10 @@ PACK_STRUCT_END
#define ETHTYPE_ARP 0x0806
#define ETHTYPE_IP 0x0800
/** ARP message types */
#define ARP_REQUEST 1
#define ARP_REPLY 2
#if ARP_QUEUEING
/** struct for queueing outgoing packets for unknown address
* defined here to be accessed by memp.h
@ -139,6 +143,12 @@ err_t etharp_output(struct netif *netif, struct pbuf *q, struct ip_addr *ipaddr)
err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q);
err_t etharp_request(struct netif *netif, struct ip_addr *ipaddr);
#if LWIP_AUTOIP
err_t etharp_raw(struct netif *netif, struct eth_addr *ethsrc_addr, struct eth_addr *ethdst_addr, struct eth_addr *hwsrc_addr, struct ip_addr *ipsrc_addr, struct eth_addr *hwdst_addr, struct ip_addr *ipdst_addr, unsigned short int OpCode);
#endif /* LWIP_AUTOIP */
#define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, 6) == 0)
#ifdef __cplusplus
}
#endif

107
src/netif/etharp.c
View File

@ -54,7 +54,11 @@
/* ARP needs to inform DHCP of any ARP replies? */
#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
# include "lwip/dhcp.h"
#endif
#endif /* LWIP_DHCP && DHCP_DOES_ARP_CHECK */
/* ARP needs to inform AUTOIP of any ARP replies? */
#if (LWIP_AUTOIP)
# include "lwip/autoip.h"
#endif /* LWIP_AUTOIP */
/** the time an ARP entry stays valid after its last update,
* (240 * 5) seconds = 20 minutes.
@ -70,10 +74,6 @@
#define HWTYPE_ETHERNET 1
/** ARP message types */
#define ARP_REQUEST 1
#define ARP_REPLY 2
#define ARPH_HWLEN(hdr) (ntohs((hdr)->_hwlen_protolen) >> 8)
#define ARPH_PROTOLEN(hdr) (ntohs((hdr)->_hwlen_protolen) & 0xff)
@ -568,7 +568,15 @@ etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
}
hdr = p->payload;
#if LWIP_AUTOIP
/* We have to check if a host already has configured our random
* created link local address and continously check if there is
* a host with this IP-address so we can detect collisions
* */
autoip_arp_reply(netif, hdr);
#endif /* LWIP_AUTOIP */
/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
* structure packing (not using structure copy which breaks strict-aliasing rules). */
SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
@ -910,6 +918,92 @@ etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
return result;
}
#if LWIP_AUTOIP
/**
* Send an ARP request packet asking for ipaddr.
*
* @param netif the lwip network interface on which to send the request
* @param ipaddr the IP address for which to ask
* @return ERR_OK if the request has been sent
* any other err_t on failure
*/
err_t
etharp_request(struct netif *netif, struct ip_addr *ipaddr)
{
struct eth_addr eth_addr_bc, eth_addr_zero;
u8_t k = netif->hwaddr_len;
while(k > 0) {
k--;
eth_addr_bc.addr[k] = 0xFF;
eth_addr_zero.addr[k] = 0x00;
}
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_request: sending ARP request.\n"));
return etharp_raw( netif,
(struct eth_addr *)netif->hwaddr,
&eth_addr_bc,
(struct eth_addr *)netif->hwaddr,
&netif->ip_addr,
&eth_addr_zero,
ipaddr,
ARP_REQUEST
);
}
err_t
etharp_raw(struct netif *netif, struct eth_addr *ethsrc_addr, struct eth_addr *ethdst_addr, struct eth_addr *hwsrc_addr, struct ip_addr *ipsrc_addr, struct eth_addr *hwdst_addr, struct ip_addr *ipdst_addr, unsigned short int OpCode)
{
struct pbuf *p;
err_t result = ERR_OK;
u8_t k; /* ARP entry index */
/* allocate a pbuf for the outgoing ARP request packet */
p = pbuf_alloc(PBUF_LINK, sizeof(struct etharp_hdr), PBUF_RAM);
/* could allocate a pbuf for an ARP request? */
if(p != NULL) {
struct etharp_hdr *hdr = p->payload;
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
hdr->opcode = htons(OpCode);
k = netif->hwaddr_len;
/* Write the ARP MAC-Addresses */
while(k > 0) {
k--;
hdr->shwaddr.addr[k] = hwsrc_addr->addr[k];
hdr->dhwaddr.addr[k] = hwdst_addr->addr[k];
}
hdr->sipaddr = *(struct ip_addr2 *)ipsrc_addr;
hdr->dipaddr = *(struct ip_addr2 *)ipdst_addr;
hdr->hwtype = htons(HWTYPE_ETHERNET);
ARPH_HWLEN_SET(hdr, netif->hwaddr_len);
hdr->proto = htons(ETHTYPE_IP);
ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr));
k = netif->hwaddr_len;
/* Write the Ethernet MAC-Addresses */
while(k > 0) {
k--;
hdr->ethhdr.dest.addr[k] = ethdst_addr->addr[k];
hdr->ethhdr.src.addr[k] = ethsrc_addr->addr[k];
}
hdr->ethhdr.type = htons(ETHTYPE_ARP);
/* send ARP query */
result = netif->linkoutput(netif, p);
/* free ARP query packet */
pbuf_free(p);
p = NULL;
/* could not allocate pbuf for ARP request */
} else {
result = ERR_MEM;
LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 2, ("etharp_raw: could not allocate pbuf for ARP request.\n"));
}
return result;
}
#else
/**
* Send an ARP request packet asking for ipaddr.
*
@ -969,3 +1063,4 @@ etharp_request(struct netif *netif, struct ip_addr *ipaddr)
}
return result;
}
#endif /* LWIP_AUTOIP */