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tag/0.2/lwIP/core/ipv4/autoip.c@0:5e1631496985, 2012-05-08 (annotated)

Committer:
root@mbed.org
Date:
Tue May 08 15:32:10 2012 +0100
Revision:
0:5e1631496985
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
root@mbed.org 0:5e1631496985 1 /**
root@mbed.org 0:5e1631496985 2 * @file
root@mbed.org 0:5e1631496985 3 * AutoIP Automatic LinkLocal IP Configuration
root@mbed.org 0:5e1631496985 4 *
root@mbed.org 0:5e1631496985 5 */
root@mbed.org 0:5e1631496985 6
root@mbed.org 0:5e1631496985 7 /*
root@mbed.org 0:5e1631496985 8 *
root@mbed.org 0:5e1631496985 9 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
root@mbed.org 0:5e1631496985 10 * All rights reserved.
root@mbed.org 0:5e1631496985 11 *
root@mbed.org 0:5e1631496985 12 * Redistribution and use in source and binary forms, with or without modification,
root@mbed.org 0:5e1631496985 13 * are permitted provided that the following conditions are met:
root@mbed.org 0:5e1631496985 14 *
root@mbed.org 0:5e1631496985 15 * 1. Redistributions of source code must retain the above copyright notice,
root@mbed.org 0:5e1631496985 16 * this list of conditions and the following disclaimer.
root@mbed.org 0:5e1631496985 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
root@mbed.org 0:5e1631496985 18 * this list of conditions and the following disclaimer in the documentation
root@mbed.org 0:5e1631496985 19 * and/or other materials provided with the distribution.
root@mbed.org 0:5e1631496985 20 * 3. The name of the author may not be used to endorse or promote products
root@mbed.org 0:5e1631496985 21 * derived from this software without specific prior written permission.
root@mbed.org 0:5e1631496985 22 *
root@mbed.org 0:5e1631496985 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
root@mbed.org 0:5e1631496985 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
root@mbed.org 0:5e1631496985 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
root@mbed.org 0:5e1631496985 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
root@mbed.org 0:5e1631496985 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
root@mbed.org 0:5e1631496985 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
root@mbed.org 0:5e1631496985 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
root@mbed.org 0:5e1631496985 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
root@mbed.org 0:5e1631496985 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
root@mbed.org 0:5e1631496985 32 * OF SUCH DAMAGE.
root@mbed.org 0:5e1631496985 33 *
root@mbed.org 0:5e1631496985 34 * Author: Dominik Spies <kontakt@dspies.de>
root@mbed.org 0:5e1631496985 35 *
root@mbed.org 0:5e1631496985 36 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
root@mbed.org 0:5e1631496985 37 * with RFC 3927.
root@mbed.org 0:5e1631496985 38 *
root@mbed.org 0:5e1631496985 39 *
root@mbed.org 0:5e1631496985 40 * Please coordinate changes and requests with Dominik Spies
root@mbed.org 0:5e1631496985 41 * <kontakt@dspies.de>
root@mbed.org 0:5e1631496985 42 */
root@mbed.org 0:5e1631496985 43
root@mbed.org 0:5e1631496985 44 /*******************************************************************************
root@mbed.org 0:5e1631496985 45 * USAGE:
root@mbed.org 0:5e1631496985 46 *
root@mbed.org 0:5e1631496985 47 * define LWIP_AUTOIP 1 in your lwipopts.h
root@mbed.org 0:5e1631496985 48 *
root@mbed.org 0:5e1631496985 49 * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
root@mbed.org 0:5e1631496985 50 * - First, call autoip_init().
root@mbed.org 0:5e1631496985 51 * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
root@mbed.org 0:5e1631496985 52 * that should be defined in autoip.h.
root@mbed.org 0:5e1631496985 53 * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
root@mbed.org 0:5e1631496985 54 * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
root@mbed.org 0:5e1631496985 55 *
root@mbed.org 0:5e1631496985 56 * Without DHCP:
root@mbed.org 0:5e1631496985 57 * - Call autoip_start() after netif_add().
root@mbed.org 0:5e1631496985 58 *
root@mbed.org 0:5e1631496985 59 * With DHCP:
root@mbed.org 0:5e1631496985 60 * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
root@mbed.org 0:5e1631496985 61 * - Configure your DHCP Client.
root@mbed.org 0:5e1631496985 62 *
root@mbed.org 0:5e1631496985 63 */
root@mbed.org 0:5e1631496985 64
root@mbed.org 0:5e1631496985 65 #include "lwip/opt.h"
root@mbed.org 0:5e1631496985 66
root@mbed.org 0:5e1631496985 67 #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
root@mbed.org 0:5e1631496985 68
root@mbed.org 0:5e1631496985 69 #include "lwip/mem.h"
root@mbed.org 0:5e1631496985 70 #include "lwip/udp.h"
root@mbed.org 0:5e1631496985 71 #include "lwip/ip_addr.h"
root@mbed.org 0:5e1631496985 72 #include "lwip/netif.h"
root@mbed.org 0:5e1631496985 73 #include "lwip/autoip.h"
root@mbed.org 0:5e1631496985 74 #include "netif/etharp.h"
root@mbed.org 0:5e1631496985 75
root@mbed.org 0:5e1631496985 76 #include <stdlib.h>
root@mbed.org 0:5e1631496985 77 #include <string.h>
root@mbed.org 0:5e1631496985 78
root@mbed.org 0:5e1631496985 79 /* Pseudo random macro based on netif informations.
root@mbed.org 0:5e1631496985 80 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
root@mbed.org 0:5e1631496985 81 #ifndef LWIP_AUTOIP_RAND
root@mbed.org 0:5e1631496985 82 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
root@mbed.org 0:5e1631496985 83 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
root@mbed.org 0:5e1631496985 84 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
root@mbed.org 0:5e1631496985 85 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
root@mbed.org 0:5e1631496985 86 (netif->autoip?netif->autoip->tried_llipaddr:0))
root@mbed.org 0:5e1631496985 87 #endif /* LWIP_AUTOIP_RAND */
root@mbed.org 0:5e1631496985 88
root@mbed.org 0:5e1631496985 89 /* static functions */
root@mbed.org 0:5e1631496985 90 static void autoip_handle_arp_conflict(struct netif *netif);
root@mbed.org 0:5e1631496985 91
root@mbed.org 0:5e1631496985 92 /* creates random LL IP-Address for a network interface */
root@mbed.org 0:5e1631496985 93 static void autoip_create_rand_addr(struct netif *netif, struct ip_addr *RandomIPAddr);
root@mbed.org 0:5e1631496985 94
root@mbed.org 0:5e1631496985 95 /* sends an ARP announce */
root@mbed.org 0:5e1631496985 96 static err_t autoip_arp_announce(struct netif *netif);
root@mbed.org 0:5e1631496985 97
root@mbed.org 0:5e1631496985 98 /* configure interface for use with current LL IP-Address */
root@mbed.org 0:5e1631496985 99 static err_t autoip_bind(struct netif *netif);
root@mbed.org 0:5e1631496985 100
root@mbed.org 0:5e1631496985 101 /**
root@mbed.org 0:5e1631496985 102 * Initialize this module
root@mbed.org 0:5e1631496985 103 */
root@mbed.org 0:5e1631496985 104 void
root@mbed.org 0:5e1631496985 105 autoip_init(void)
root@mbed.org 0:5e1631496985 106 {
root@mbed.org 0:5e1631496985 107 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n"));
root@mbed.org 0:5e1631496985 108 }
root@mbed.org 0:5e1631496985 109
root@mbed.org 0:5e1631496985 110 /**
root@mbed.org 0:5e1631496985 111 * Handle a IP address conflict after an ARP conflict detection
root@mbed.org 0:5e1631496985 112 */
root@mbed.org 0:5e1631496985 113 static void
root@mbed.org 0:5e1631496985 114 autoip_handle_arp_conflict(struct netif *netif)
root@mbed.org 0:5e1631496985 115 {
root@mbed.org 0:5e1631496985 116 /* Somehow detect if we are defending or retreating */
root@mbed.org 0:5e1631496985 117 unsigned char defend = 1; /* tbd */
root@mbed.org 0:5e1631496985 118
root@mbed.org 0:5e1631496985 119 if(defend) {
root@mbed.org 0:5e1631496985 120 if(netif->autoip->lastconflict > 0) {
root@mbed.org 0:5e1631496985 121 /* retreat, there was a conflicting ARP in the last
root@mbed.org 0:5e1631496985 122 * DEFEND_INTERVAL seconds
root@mbed.org 0:5e1631496985 123 */
root@mbed.org 0:5e1631496985 124 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 125 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
root@mbed.org 0:5e1631496985 126
root@mbed.org 0:5e1631496985 127 /* TODO: close all TCP sessions */
root@mbed.org 0:5e1631496985 128 autoip_start(netif);
root@mbed.org 0:5e1631496985 129 } else {
root@mbed.org 0:5e1631496985 130 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 131 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
root@mbed.org 0:5e1631496985 132 autoip_arp_announce(netif);
root@mbed.org 0:5e1631496985 133 netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 134 }
root@mbed.org 0:5e1631496985 135 } else {
root@mbed.org 0:5e1631496985 136 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 137 ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
root@mbed.org 0:5e1631496985 138 /* TODO: close all TCP sessions */
root@mbed.org 0:5e1631496985 139 autoip_start(netif);
root@mbed.org 0:5e1631496985 140 }
root@mbed.org 0:5e1631496985 141 }
root@mbed.org 0:5e1631496985 142
root@mbed.org 0:5e1631496985 143 /**
root@mbed.org 0:5e1631496985 144 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
root@mbed.org 0:5e1631496985 145 *
root@mbed.org 0:5e1631496985 146 * @param netif network interface on which create the IP-Address
root@mbed.org 0:5e1631496985 147 * @param RandomIPAddr ip address to initialize
root@mbed.org 0:5e1631496985 148 */
root@mbed.org 0:5e1631496985 149 static void
root@mbed.org 0:5e1631496985 150 autoip_create_rand_addr(struct netif *netif, struct ip_addr *RandomIPAddr)
root@mbed.org 0:5e1631496985 151 {
root@mbed.org 0:5e1631496985 152 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
root@mbed.org 0:5e1631496985 153 * compliant to RFC 3927 Section 2.1
root@mbed.org 0:5e1631496985 154 * We have 254 * 256 possibilities
root@mbed.org 0:5e1631496985 155 */
root@mbed.org 0:5e1631496985 156
root@mbed.org 0:5e1631496985 157 RandomIPAddr->addr = (0xA9FE0100 + ((u32_t)(((u8_t)(netif->hwaddr[4])) |
root@mbed.org 0:5e1631496985 158 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)) + netif->autoip->tried_llipaddr);
root@mbed.org 0:5e1631496985 159
root@mbed.org 0:5e1631496985 160 if (RandomIPAddr->addr>0xA9FEFEFF) {
root@mbed.org 0:5e1631496985 161 RandomIPAddr->addr = (0xA9FE0100 + (RandomIPAddr->addr-0xA9FEFEFF));
root@mbed.org 0:5e1631496985 162 }
root@mbed.org 0:5e1631496985 163 if (RandomIPAddr->addr<0xA9FE0100) {
root@mbed.org 0:5e1631496985 164 RandomIPAddr->addr = (0xA9FEFEFF - (0xA9FE0100-RandomIPAddr->addr));
root@mbed.org 0:5e1631496985 165 }
root@mbed.org 0:5e1631496985 166 RandomIPAddr->addr = htonl(RandomIPAddr->addr);
root@mbed.org 0:5e1631496985 167
root@mbed.org 0:5e1631496985 168 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 169 ("autoip_create_rand_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n",
root@mbed.org 0:5e1631496985 170 (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(RandomIPAddr->addr)));
root@mbed.org 0:5e1631496985 171 }
root@mbed.org 0:5e1631496985 172
root@mbed.org 0:5e1631496985 173 /**
root@mbed.org 0:5e1631496985 174 * Sends an ARP announce from a network interface
root@mbed.org 0:5e1631496985 175 *
root@mbed.org 0:5e1631496985 176 * @param netif network interface used to send the announce
root@mbed.org 0:5e1631496985 177 */
root@mbed.org 0:5e1631496985 178 static err_t
root@mbed.org 0:5e1631496985 179 autoip_arp_announce(struct netif *netif)
root@mbed.org 0:5e1631496985 180 {
root@mbed.org 0:5e1631496985 181 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
root@mbed.org 0:5e1631496985 182 (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
root@mbed.org 0:5e1631496985 183 &netif->autoip->llipaddr, ARP_REQUEST);
root@mbed.org 0:5e1631496985 184 }
root@mbed.org 0:5e1631496985 185
root@mbed.org 0:5e1631496985 186 /**
root@mbed.org 0:5e1631496985 187 * Configure interface for use with current LL IP-Address
root@mbed.org 0:5e1631496985 188 *
root@mbed.org 0:5e1631496985 189 * @param netif network interface to configure with current LL IP-Address
root@mbed.org 0:5e1631496985 190 */
root@mbed.org 0:5e1631496985 191 static err_t
root@mbed.org 0:5e1631496985 192 autoip_bind(struct netif *netif)
root@mbed.org 0:5e1631496985 193 {
root@mbed.org 0:5e1631496985 194 struct autoip *autoip = netif->autoip;
root@mbed.org 0:5e1631496985 195 struct ip_addr sn_mask, gw_addr;
root@mbed.org 0:5e1631496985 196
root@mbed.org 0:5e1631496985 197 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
root@mbed.org 0:5e1631496985 198 ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n",
root@mbed.org 0:5e1631496985 199 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr));
root@mbed.org 0:5e1631496985 200
root@mbed.org 0:5e1631496985 201 IP4_ADDR(&sn_mask, 255, 255, 0, 0);
root@mbed.org 0:5e1631496985 202 IP4_ADDR(&gw_addr, 0, 0, 0, 0);
root@mbed.org 0:5e1631496985 203
root@mbed.org 0:5e1631496985 204 netif_set_ipaddr(netif, &autoip->llipaddr);
root@mbed.org 0:5e1631496985 205 netif_set_netmask(netif, &sn_mask);
root@mbed.org 0:5e1631496985 206 netif_set_gw(netif, &gw_addr);
root@mbed.org 0:5e1631496985 207
root@mbed.org 0:5e1631496985 208 /* bring the interface up */
root@mbed.org 0:5e1631496985 209 netif_set_up(netif);
root@mbed.org 0:5e1631496985 210
root@mbed.org 0:5e1631496985 211 return ERR_OK;
root@mbed.org 0:5e1631496985 212 }
root@mbed.org 0:5e1631496985 213
root@mbed.org 0:5e1631496985 214 /**
root@mbed.org 0:5e1631496985 215 * Start AutoIP client
root@mbed.org 0:5e1631496985 216 *
root@mbed.org 0:5e1631496985 217 * @param netif network interface on which start the AutoIP client
root@mbed.org 0:5e1631496985 218 */
root@mbed.org 0:5e1631496985 219 err_t
root@mbed.org 0:5e1631496985 220 autoip_start(struct netif *netif)
root@mbed.org 0:5e1631496985 221 {
root@mbed.org 0:5e1631496985 222 struct autoip *autoip = netif->autoip;
root@mbed.org 0:5e1631496985 223 err_t result = ERR_OK;
root@mbed.org 0:5e1631496985 224
root@mbed.org 0:5e1631496985 225 if(netif_is_up(netif)) {
root@mbed.org 0:5e1631496985 226 netif_set_down(netif);
root@mbed.org 0:5e1631496985 227 }
root@mbed.org 0:5e1631496985 228
root@mbed.org 0:5e1631496985 229 /* Set IP-Address, Netmask and Gateway to 0 to make sure that
root@mbed.org 0:5e1631496985 230 * ARP Packets are formed correctly
root@mbed.org 0:5e1631496985 231 */
root@mbed.org 0:5e1631496985 232 netif->ip_addr.addr = 0;
root@mbed.org 0:5e1631496985 233 netif->netmask.addr = 0;
root@mbed.org 0:5e1631496985 234 netif->gw.addr = 0;
root@mbed.org 0:5e1631496985 235
root@mbed.org 0:5e1631496985 236 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
root@mbed.org 0:5e1631496985 237 ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
root@mbed.org 0:5e1631496985 238 netif->name[1], (u16_t)netif->num));
root@mbed.org 0:5e1631496985 239 if(autoip == NULL) {
root@mbed.org 0:5e1631496985 240 /* no AutoIP client attached yet? */
root@mbed.org 0:5e1631496985 241 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
root@mbed.org 0:5e1631496985 242 ("autoip_start(): starting new AUTOIP client\n"));
root@mbed.org 0:5e1631496985 243 autoip = (struct autoip *)mem_malloc(sizeof(struct autoip)); // XXX: static_cast<struct autoip *>(x)
root@mbed.org 0:5e1631496985 244 if(autoip == NULL) {
root@mbed.org 0:5e1631496985 245 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
root@mbed.org 0:5e1631496985 246 ("autoip_start(): could not allocate autoip\n"));
root@mbed.org 0:5e1631496985 247 return ERR_MEM;
root@mbed.org 0:5e1631496985 248 }
root@mbed.org 0:5e1631496985 249 memset( autoip, 0, sizeof(struct autoip));
root@mbed.org 0:5e1631496985 250 /* store this AutoIP client in the netif */
root@mbed.org 0:5e1631496985 251 netif->autoip = autoip;
root@mbed.org 0:5e1631496985 252 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
root@mbed.org 0:5e1631496985 253 } else {
root@mbed.org 0:5e1631496985 254 autoip->state = AUTOIP_STATE_OFF;
root@mbed.org 0:5e1631496985 255 autoip->ttw = 0;
root@mbed.org 0:5e1631496985 256 autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 257 memset(&autoip->llipaddr, 0, sizeof(struct ip_addr));
root@mbed.org 0:5e1631496985 258 autoip->lastconflict = 0;
root@mbed.org 0:5e1631496985 259 }
root@mbed.org 0:5e1631496985 260
root@mbed.org 0:5e1631496985 261 autoip_create_rand_addr(netif, &(autoip->llipaddr));
root@mbed.org 0:5e1631496985 262 autoip->tried_llipaddr++;
root@mbed.org 0:5e1631496985 263 autoip->state = AUTOIP_STATE_PROBING;
root@mbed.org 0:5e1631496985 264 autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 265
root@mbed.org 0:5e1631496985 266 /* time to wait to first probe, this is randomly
root@mbed.org 0:5e1631496985 267 * choosen out of 0 to PROBE_WAIT seconds.
root@mbed.org 0:5e1631496985 268 * compliant to RFC 3927 Section 2.2.1
root@mbed.org 0:5e1631496985 269 */
root@mbed.org 0:5e1631496985 270 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
root@mbed.org 0:5e1631496985 271
root@mbed.org 0:5e1631496985 272 /*
root@mbed.org 0:5e1631496985 273 * if we tried more then MAX_CONFLICTS we must limit our rate for
root@mbed.org 0:5e1631496985 274 * accquiring and probing address
root@mbed.org 0:5e1631496985 275 * compliant to RFC 3927 Section 2.2.1
root@mbed.org 0:5e1631496985 276 */
root@mbed.org 0:5e1631496985 277
root@mbed.org 0:5e1631496985 278 if(autoip->tried_llipaddr > MAX_CONFLICTS) {
root@mbed.org 0:5e1631496985 279 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 280 }
root@mbed.org 0:5e1631496985 281
root@mbed.org 0:5e1631496985 282 return result;
root@mbed.org 0:5e1631496985 283 }
root@mbed.org 0:5e1631496985 284
root@mbed.org 0:5e1631496985 285 /**
root@mbed.org 0:5e1631496985 286 * Stop AutoIP client
root@mbed.org 0:5e1631496985 287 *
root@mbed.org 0:5e1631496985 288 * @param netif network interface on which stop the AutoIP client
root@mbed.org 0:5e1631496985 289 */
root@mbed.org 0:5e1631496985 290 err_t
root@mbed.org 0:5e1631496985 291 autoip_stop(struct netif *netif)
root@mbed.org 0:5e1631496985 292 {
root@mbed.org 0:5e1631496985 293 netif->autoip->state = AUTOIP_STATE_OFF;
root@mbed.org 0:5e1631496985 294 netif_set_down(netif);
root@mbed.org 0:5e1631496985 295 return ERR_OK;
root@mbed.org 0:5e1631496985 296 }
root@mbed.org 0:5e1631496985 297
root@mbed.org 0:5e1631496985 298 /**
root@mbed.org 0:5e1631496985 299 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
root@mbed.org 0:5e1631496985 300 */
root@mbed.org 0:5e1631496985 301 void
root@mbed.org 0:5e1631496985 302 autoip_tmr()
root@mbed.org 0:5e1631496985 303 {
root@mbed.org 0:5e1631496985 304 struct netif *netif = netif_list;
root@mbed.org 0:5e1631496985 305 /* loop through netif's */
root@mbed.org 0:5e1631496985 306 while (netif != NULL) {
root@mbed.org 0:5e1631496985 307 /* only act on AutoIP configured interfaces */
root@mbed.org 0:5e1631496985 308 if (netif->autoip != NULL) {
root@mbed.org 0:5e1631496985 309 if(netif->autoip->lastconflict > 0) {
root@mbed.org 0:5e1631496985 310 netif->autoip->lastconflict--;
root@mbed.org 0:5e1631496985 311 }
root@mbed.org 0:5e1631496985 312
root@mbed.org 0:5e1631496985 313 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
root@mbed.org 0:5e1631496985 314 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
root@mbed.org 0:5e1631496985 315 (u16_t)(netif->autoip->state), netif->autoip->ttw));
root@mbed.org 0:5e1631496985 316
root@mbed.org 0:5e1631496985 317 switch(netif->autoip->state) {
root@mbed.org 0:5e1631496985 318 case AUTOIP_STATE_PROBING:
root@mbed.org 0:5e1631496985 319 if(netif->autoip->ttw > 0) {
root@mbed.org 0:5e1631496985 320 netif->autoip->ttw--;
root@mbed.org 0:5e1631496985 321 } else {
root@mbed.org 0:5e1631496985 322 if(netif->autoip->sent_num == PROBE_NUM) {
root@mbed.org 0:5e1631496985 323 netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
root@mbed.org 0:5e1631496985 324 netif->autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 325 netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 326 } else {
root@mbed.org 0:5e1631496985 327 etharp_request(netif, &(netif->autoip->llipaddr));
root@mbed.org 0:5e1631496985 328 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
root@mbed.org 0:5e1631496985 329 ("autoip_tmr() PROBING Sent Probe\n"));
root@mbed.org 0:5e1631496985 330 netif->autoip->sent_num++;
root@mbed.org 0:5e1631496985 331 /* calculate time to wait to next probe */
root@mbed.org 0:5e1631496985 332 netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
root@mbed.org 0:5e1631496985 333 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
root@mbed.org 0:5e1631496985 334 PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
root@mbed.org 0:5e1631496985 335 }
root@mbed.org 0:5e1631496985 336 }
root@mbed.org 0:5e1631496985 337 break;
root@mbed.org 0:5e1631496985 338
root@mbed.org 0:5e1631496985 339 case AUTOIP_STATE_ANNOUNCING:
root@mbed.org 0:5e1631496985 340 if(netif->autoip->ttw > 0) {
root@mbed.org 0:5e1631496985 341 netif->autoip->ttw--;
root@mbed.org 0:5e1631496985 342 } else {
root@mbed.org 0:5e1631496985 343 if(netif->autoip->sent_num == 0) {
root@mbed.org 0:5e1631496985 344 /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
root@mbed.org 0:5e1631496985 345 * Now we can bind to an IP address and use it
root@mbed.org 0:5e1631496985 346 */
root@mbed.org 0:5e1631496985 347 autoip_bind(netif);
root@mbed.org 0:5e1631496985 348 }
root@mbed.org 0:5e1631496985 349
root@mbed.org 0:5e1631496985 350 if(netif->autoip->sent_num == ANNOUNCE_NUM) {
root@mbed.org 0:5e1631496985 351 netif->autoip->state = AUTOIP_STATE_BOUND;
root@mbed.org 0:5e1631496985 352 netif->autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 353 netif->autoip->ttw = 0;
root@mbed.org 0:5e1631496985 354 } else {
root@mbed.org 0:5e1631496985 355 autoip_arp_announce(netif);
root@mbed.org 0:5e1631496985 356 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
root@mbed.org 0:5e1631496985 357 ("autoip_tmr() ANNOUNCING Sent Announce\n"));
root@mbed.org 0:5e1631496985 358 netif->autoip->sent_num++;
root@mbed.org 0:5e1631496985 359 netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 360 }
root@mbed.org 0:5e1631496985 361 }
root@mbed.org 0:5e1631496985 362 break;
root@mbed.org 0:5e1631496985 363 }
root@mbed.org 0:5e1631496985 364 }
root@mbed.org 0:5e1631496985 365 /* proceed to next network interface */
root@mbed.org 0:5e1631496985 366 netif = netif->next;
root@mbed.org 0:5e1631496985 367 }
root@mbed.org 0:5e1631496985 368 }
root@mbed.org 0:5e1631496985 369
root@mbed.org 0:5e1631496985 370 /**
root@mbed.org 0:5e1631496985 371 * Handles every incoming ARP Packet, called by etharp_arp_input.
root@mbed.org 0:5e1631496985 372 *
root@mbed.org 0:5e1631496985 373 * @param netif network interface to use for autoip processing
root@mbed.org 0:5e1631496985 374 * @param hdr Incoming ARP packet
root@mbed.org 0:5e1631496985 375 */
root@mbed.org 0:5e1631496985 376 void
root@mbed.org 0:5e1631496985 377 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
root@mbed.org 0:5e1631496985 378 {
root@mbed.org 0:5e1631496985 379 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_arp_reply()\n"));
root@mbed.org 0:5e1631496985 380 if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
root@mbed.org 0:5e1631496985 381 /* when ip.src == llipaddr && hw.src != netif->hwaddr
root@mbed.org 0:5e1631496985 382 *
root@mbed.org 0:5e1631496985 383 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
root@mbed.org 0:5e1631496985 384 * we have a conflict and must solve it
root@mbed.org 0:5e1631496985 385 */
root@mbed.org 0:5e1631496985 386 struct ip_addr sipaddr, dipaddr;
root@mbed.org 0:5e1631496985 387 struct eth_addr netifaddr;
root@mbed.org 0:5e1631496985 388 netifaddr.addr[0] = netif->hwaddr[0];
root@mbed.org 0:5e1631496985 389 netifaddr.addr[1] = netif->hwaddr[1];
root@mbed.org 0:5e1631496985 390 netifaddr.addr[2] = netif->hwaddr[2];
root@mbed.org 0:5e1631496985 391 netifaddr.addr[3] = netif->hwaddr[3];
root@mbed.org 0:5e1631496985 392 netifaddr.addr[4] = netif->hwaddr[4];
root@mbed.org 0:5e1631496985 393 netifaddr.addr[5] = netif->hwaddr[5];
root@mbed.org 0:5e1631496985 394
root@mbed.org 0:5e1631496985 395 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
root@mbed.org 0:5e1631496985 396 * structure packing (not using structure copy which breaks strict-aliasing rules).
root@mbed.org 0:5e1631496985 397 */
root@mbed.org 0:5e1631496985 398 MEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
root@mbed.org 0:5e1631496985 399 MEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
root@mbed.org 0:5e1631496985 400
root@mbed.org 0:5e1631496985 401 if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
root@mbed.org 0:5e1631496985 402 ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
root@mbed.org 0:5e1631496985 403 (netif->autoip->sent_num == 0))) {
root@mbed.org 0:5e1631496985 404 /* RFC 3927 Section 2.2.1:
root@mbed.org 0:5e1631496985 405 * from beginning to after ANNOUNCE_WAIT
root@mbed.org 0:5e1631496985 406 * seconds we have a conflict if
root@mbed.org 0:5e1631496985 407 * ip.src == llipaddr OR
root@mbed.org 0:5e1631496985 408 * ip.dst == llipaddr && hw.src != own hwaddr
root@mbed.org 0:5e1631496985 409 */
root@mbed.org 0:5e1631496985 410 if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
root@mbed.org 0:5e1631496985 411 (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
root@mbed.org 0:5e1631496985 412 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
root@mbed.org 0:5e1631496985 413 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 414 ("autoip_arp_reply(): Probe Conflict detected\n"));
root@mbed.org 0:5e1631496985 415 autoip_start(netif);
root@mbed.org 0:5e1631496985 416 }
root@mbed.org 0:5e1631496985 417 } else {
root@mbed.org 0:5e1631496985 418 /* RFC 3927 Section 2.5:
root@mbed.org 0:5e1631496985 419 * in any state we have a conflict if
root@mbed.org 0:5e1631496985 420 * ip.src == llipaddr && hw.src != own hwaddr
root@mbed.org 0:5e1631496985 421 */
root@mbed.org 0:5e1631496985 422 if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
root@mbed.org 0:5e1631496985 423 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
root@mbed.org 0:5e1631496985 424 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 425 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
root@mbed.org 0:5e1631496985 426 autoip_handle_arp_conflict(netif);
root@mbed.org 0:5e1631496985 427 }
root@mbed.org 0:5e1631496985 428 }
root@mbed.org 0:5e1631496985 429 }
root@mbed.org 0:5e1631496985 430 }
root@mbed.org 0:5e1631496985 431
root@mbed.org 0:5e1631496985 432 #endif /* LWIP_AUTOIP */