mbed unsupported / lwip

A version of LWIP, provided for backwards compatibility.

Dependents:   AA_DemoBoard DemoBoard HelloServerDemo DemoBoard_RangeIndicator ... more

trunk/Core/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 /* 169.254.0.0 */
root@mbed.org 0:5e1631496985 80 #define AUTOIP_NET 0xA9FE0000
root@mbed.org 0:5e1631496985 81 /* 169.254.1.0 */
root@mbed.org 0:5e1631496985 82 #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
root@mbed.org 0:5e1631496985 83 /* 169.254.254.255 */
root@mbed.org 0:5e1631496985 84 #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
root@mbed.org 0:5e1631496985 85
root@mbed.org 0:5e1631496985 86
root@mbed.org 0:5e1631496985 87 /** Pseudo random macro based on netif informations.
root@mbed.org 0:5e1631496985 88 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
root@mbed.org 0:5e1631496985 89 #ifndef LWIP_AUTOIP_RAND
root@mbed.org 0:5e1631496985 90 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
root@mbed.org 0:5e1631496985 91 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
root@mbed.org 0:5e1631496985 92 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
root@mbed.org 0:5e1631496985 93 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
root@mbed.org 0:5e1631496985 94 (netif->autoip?netif->autoip->tried_llipaddr:0))
root@mbed.org 0:5e1631496985 95 #endif /* LWIP_AUTOIP_RAND */
root@mbed.org 0:5e1631496985 96
root@mbed.org 0:5e1631496985 97 /**
root@mbed.org 0:5e1631496985 98 * Macro that generates the initial IP address to be tried by AUTOIP.
root@mbed.org 0:5e1631496985 99 * If you want to override this, define it to something else in lwipopts.h.
root@mbed.org 0:5e1631496985 100 */
root@mbed.org 0:5e1631496985 101 #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
root@mbed.org 0:5e1631496985 102 #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
root@mbed.org 0:5e1631496985 103 htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
root@mbed.org 0:5e1631496985 104 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
root@mbed.org 0:5e1631496985 105 #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
root@mbed.org 0:5e1631496985 106
root@mbed.org 0:5e1631496985 107 /* static functions */
root@mbed.org 0:5e1631496985 108 static void autoip_handle_arp_conflict(struct netif *netif);
root@mbed.org 0:5e1631496985 109
root@mbed.org 0:5e1631496985 110 /* creates a pseudo random LL IP-Address for a network interface */
root@mbed.org 0:5e1631496985 111 static void autoip_create_addr(struct netif *netif, struct ip_addr *ipaddr);
root@mbed.org 0:5e1631496985 112
root@mbed.org 0:5e1631496985 113 /* sends an ARP probe */
root@mbed.org 0:5e1631496985 114 static err_t autoip_arp_probe(struct netif *netif);
root@mbed.org 0:5e1631496985 115
root@mbed.org 0:5e1631496985 116 /* sends an ARP announce */
root@mbed.org 0:5e1631496985 117 static err_t autoip_arp_announce(struct netif *netif);
root@mbed.org 0:5e1631496985 118
root@mbed.org 0:5e1631496985 119 /* configure interface for use with current LL IP-Address */
root@mbed.org 0:5e1631496985 120 static err_t autoip_bind(struct netif *netif);
root@mbed.org 0:5e1631496985 121
root@mbed.org 0:5e1631496985 122 /* start sending probes for llipaddr */
root@mbed.org 0:5e1631496985 123 static void autoip_start_probing(struct netif *netif);
root@mbed.org 0:5e1631496985 124
root@mbed.org 0:5e1631496985 125 /**
root@mbed.org 0:5e1631496985 126 * Initialize this module
root@mbed.org 0:5e1631496985 127 */
root@mbed.org 0:5e1631496985 128 void
root@mbed.org 0:5e1631496985 129 autoip_init(void)
root@mbed.org 0:5e1631496985 130 {
root@mbed.org 0:5e1631496985 131 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n"));
root@mbed.org 0:5e1631496985 132 }
root@mbed.org 0:5e1631496985 133
root@mbed.org 0:5e1631496985 134 /**
root@mbed.org 0:5e1631496985 135 * Handle a IP address conflict after an ARP conflict detection
root@mbed.org 0:5e1631496985 136 */
root@mbed.org 0:5e1631496985 137 static void
root@mbed.org 0:5e1631496985 138 autoip_handle_arp_conflict(struct netif *netif)
root@mbed.org 0:5e1631496985 139 {
root@mbed.org 0:5e1631496985 140 /* Somehow detect if we are defending or retreating */
root@mbed.org 0:5e1631496985 141 unsigned char defend = 1; /* tbd */
root@mbed.org 0:5e1631496985 142
root@mbed.org 0:5e1631496985 143 if(defend) {
root@mbed.org 0:5e1631496985 144 if(netif->autoip->lastconflict > 0) {
root@mbed.org 0:5e1631496985 145 /* retreat, there was a conflicting ARP in the last
root@mbed.org 0:5e1631496985 146 * DEFEND_INTERVAL seconds
root@mbed.org 0:5e1631496985 147 */
root@mbed.org 0:5e1631496985 148 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 149 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
root@mbed.org 0:5e1631496985 150
root@mbed.org 0:5e1631496985 151 /* TODO: close all TCP sessions */
root@mbed.org 0:5e1631496985 152 autoip_start(netif);
root@mbed.org 0:5e1631496985 153 } else {
root@mbed.org 0:5e1631496985 154 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 155 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
root@mbed.org 0:5e1631496985 156 autoip_arp_announce(netif);
root@mbed.org 0:5e1631496985 157 netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 158 }
root@mbed.org 0:5e1631496985 159 } else {
root@mbed.org 0:5e1631496985 160 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 161 ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
root@mbed.org 0:5e1631496985 162 /* TODO: close all TCP sessions */
root@mbed.org 0:5e1631496985 163 autoip_start(netif);
root@mbed.org 0:5e1631496985 164 }
root@mbed.org 0:5e1631496985 165 }
root@mbed.org 0:5e1631496985 166
root@mbed.org 0:5e1631496985 167 /**
root@mbed.org 0:5e1631496985 168 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
root@mbed.org 0:5e1631496985 169 *
root@mbed.org 0:5e1631496985 170 * @param netif network interface on which create the IP-Address
root@mbed.org 0:5e1631496985 171 * @param ipaddr ip address to initialize
root@mbed.org 0:5e1631496985 172 */
root@mbed.org 0:5e1631496985 173 static void
root@mbed.org 0:5e1631496985 174 autoip_create_addr(struct netif *netif, struct ip_addr *ipaddr)
root@mbed.org 0:5e1631496985 175 {
root@mbed.org 0:5e1631496985 176 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
root@mbed.org 0:5e1631496985 177 * compliant to RFC 3927 Section 2.1
root@mbed.org 0:5e1631496985 178 * We have 254 * 256 possibilities */
root@mbed.org 0:5e1631496985 179
root@mbed.org 0:5e1631496985 180 u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
root@mbed.org 0:5e1631496985 181 addr += netif->autoip->tried_llipaddr;
root@mbed.org 0:5e1631496985 182 addr = AUTOIP_NET | (addr & 0xffff);
root@mbed.org 0:5e1631496985 183 /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
root@mbed.org 0:5e1631496985 184
root@mbed.org 0:5e1631496985 185 if (addr < AUTOIP_RANGE_START) {
root@mbed.org 0:5e1631496985 186 addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
root@mbed.org 0:5e1631496985 187 }
root@mbed.org 0:5e1631496985 188 if (addr > AUTOIP_RANGE_END) {
root@mbed.org 0:5e1631496985 189 addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
root@mbed.org 0:5e1631496985 190 }
root@mbed.org 0:5e1631496985 191 LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
root@mbed.org 0:5e1631496985 192 (addr <= AUTOIP_RANGE_END));
root@mbed.org 0:5e1631496985 193 ipaddr->addr = htonl(addr);
root@mbed.org 0:5e1631496985 194
root@mbed.org 0:5e1631496985 195 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 196 ("autoip_create_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n",
root@mbed.org 0:5e1631496985 197 (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(ipaddr->addr)));
root@mbed.org 0:5e1631496985 198 }
root@mbed.org 0:5e1631496985 199
root@mbed.org 0:5e1631496985 200 /**
root@mbed.org 0:5e1631496985 201 * Sends an ARP probe from a network interface
root@mbed.org 0:5e1631496985 202 *
root@mbed.org 0:5e1631496985 203 * @param netif network interface used to send the probe
root@mbed.org 0:5e1631496985 204 */
root@mbed.org 0:5e1631496985 205 static err_t
root@mbed.org 0:5e1631496985 206 autoip_arp_probe(struct netif *netif)
root@mbed.org 0:5e1631496985 207 {
root@mbed.org 0:5e1631496985 208 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
root@mbed.org 0:5e1631496985 209 (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
root@mbed.org 0:5e1631496985 210 &netif->autoip->llipaddr, ARP_REQUEST);
root@mbed.org 0:5e1631496985 211 }
root@mbed.org 0:5e1631496985 212
root@mbed.org 0:5e1631496985 213 /**
root@mbed.org 0:5e1631496985 214 * Sends an ARP announce from a network interface
root@mbed.org 0:5e1631496985 215 *
root@mbed.org 0:5e1631496985 216 * @param netif network interface used to send the announce
root@mbed.org 0:5e1631496985 217 */
root@mbed.org 0:5e1631496985 218 static err_t
root@mbed.org 0:5e1631496985 219 autoip_arp_announce(struct netif *netif)
root@mbed.org 0:5e1631496985 220 {
root@mbed.org 0:5e1631496985 221 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
root@mbed.org 0:5e1631496985 222 (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
root@mbed.org 0:5e1631496985 223 &netif->autoip->llipaddr, ARP_REQUEST);
root@mbed.org 0:5e1631496985 224 }
root@mbed.org 0:5e1631496985 225
root@mbed.org 0:5e1631496985 226 /**
root@mbed.org 0:5e1631496985 227 * Configure interface for use with current LL IP-Address
root@mbed.org 0:5e1631496985 228 *
root@mbed.org 0:5e1631496985 229 * @param netif network interface to configure with current LL IP-Address
root@mbed.org 0:5e1631496985 230 */
root@mbed.org 0:5e1631496985 231 static err_t
root@mbed.org 0:5e1631496985 232 autoip_bind(struct netif *netif)
root@mbed.org 0:5e1631496985 233 {
root@mbed.org 0:5e1631496985 234 struct autoip *autoip = netif->autoip;
root@mbed.org 0:5e1631496985 235 struct ip_addr sn_mask, gw_addr;
root@mbed.org 0:5e1631496985 236
root@mbed.org 0:5e1631496985 237 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
root@mbed.org 0:5e1631496985 238 ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n",
root@mbed.org 0:5e1631496985 239 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr));
root@mbed.org 0:5e1631496985 240
root@mbed.org 0:5e1631496985 241 IP4_ADDR(&sn_mask, 255, 255, 0, 0);
root@mbed.org 0:5e1631496985 242 IP4_ADDR(&gw_addr, 0, 0, 0, 0);
root@mbed.org 0:5e1631496985 243
root@mbed.org 0:5e1631496985 244 netif_set_ipaddr(netif, &autoip->llipaddr);
root@mbed.org 0:5e1631496985 245 netif_set_netmask(netif, &sn_mask);
root@mbed.org 0:5e1631496985 246 netif_set_gw(netif, &gw_addr);
root@mbed.org 0:5e1631496985 247
root@mbed.org 0:5e1631496985 248 /* bring the interface up */
root@mbed.org 0:5e1631496985 249 netif_set_up(netif);
root@mbed.org 0:5e1631496985 250
root@mbed.org 0:5e1631496985 251 return ERR_OK;
root@mbed.org 0:5e1631496985 252 }
root@mbed.org 0:5e1631496985 253
root@mbed.org 0:5e1631496985 254 /**
root@mbed.org 0:5e1631496985 255 * Start AutoIP client
root@mbed.org 0:5e1631496985 256 *
root@mbed.org 0:5e1631496985 257 * @param netif network interface on which start the AutoIP client
root@mbed.org 0:5e1631496985 258 */
root@mbed.org 0:5e1631496985 259 err_t
root@mbed.org 0:5e1631496985 260 autoip_start(struct netif *netif)
root@mbed.org 0:5e1631496985 261 {
root@mbed.org 0:5e1631496985 262 struct autoip *autoip = netif->autoip;
root@mbed.org 0:5e1631496985 263 err_t result = ERR_OK;
root@mbed.org 0:5e1631496985 264
root@mbed.org 0:5e1631496985 265 if(netif_is_up(netif)) {
root@mbed.org 0:5e1631496985 266 netif_set_down(netif);
root@mbed.org 0:5e1631496985 267 }
root@mbed.org 0:5e1631496985 268
root@mbed.org 0:5e1631496985 269 /* Set IP-Address, Netmask and Gateway to 0 to make sure that
root@mbed.org 0:5e1631496985 270 * ARP Packets are formed correctly
root@mbed.org 0:5e1631496985 271 */
root@mbed.org 0:5e1631496985 272 netif->ip_addr.addr = 0;
root@mbed.org 0:5e1631496985 273 netif->netmask.addr = 0;
root@mbed.org 0:5e1631496985 274 netif->gw.addr = 0;
root@mbed.org 0:5e1631496985 275
root@mbed.org 0:5e1631496985 276 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
root@mbed.org 0:5e1631496985 277 ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
root@mbed.org 0:5e1631496985 278 netif->name[1], (u16_t)netif->num));
root@mbed.org 0:5e1631496985 279 if(autoip == NULL) {
root@mbed.org 0:5e1631496985 280 /* no AutoIP client attached yet? */
root@mbed.org 0:5e1631496985 281 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
root@mbed.org 0:5e1631496985 282 ("autoip_start(): starting new AUTOIP client\n"));
root@mbed.org 0:5e1631496985 283 autoip = mem_malloc(sizeof(struct autoip));
root@mbed.org 0:5e1631496985 284 if(autoip == NULL) {
root@mbed.org 0:5e1631496985 285 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
root@mbed.org 0:5e1631496985 286 ("autoip_start(): could not allocate autoip\n"));
root@mbed.org 0:5e1631496985 287 return ERR_MEM;
root@mbed.org 0:5e1631496985 288 }
root@mbed.org 0:5e1631496985 289 memset( autoip, 0, sizeof(struct autoip));
root@mbed.org 0:5e1631496985 290 /* store this AutoIP client in the netif */
root@mbed.org 0:5e1631496985 291 netif->autoip = autoip;
root@mbed.org 0:5e1631496985 292 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
root@mbed.org 0:5e1631496985 293 } else {
root@mbed.org 0:5e1631496985 294 autoip->state = AUTOIP_STATE_OFF;
root@mbed.org 0:5e1631496985 295 autoip->ttw = 0;
root@mbed.org 0:5e1631496985 296 autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 297 memset(&autoip->llipaddr, 0, sizeof(struct ip_addr));
root@mbed.org 0:5e1631496985 298 autoip->lastconflict = 0;
root@mbed.org 0:5e1631496985 299 }
root@mbed.org 0:5e1631496985 300
root@mbed.org 0:5e1631496985 301 autoip_create_addr(netif, &(autoip->llipaddr));
root@mbed.org 0:5e1631496985 302 autoip->tried_llipaddr++;
root@mbed.org 0:5e1631496985 303 autoip_start_probing(netif);
root@mbed.org 0:5e1631496985 304
root@mbed.org 0:5e1631496985 305 return result;
root@mbed.org 0:5e1631496985 306 }
root@mbed.org 0:5e1631496985 307
root@mbed.org 0:5e1631496985 308 static void
root@mbed.org 0:5e1631496985 309 autoip_start_probing(struct netif *netif)
root@mbed.org 0:5e1631496985 310 {
root@mbed.org 0:5e1631496985 311 struct autoip *autoip = netif->autoip;
root@mbed.org 0:5e1631496985 312
root@mbed.org 0:5e1631496985 313 autoip->state = AUTOIP_STATE_PROBING;
root@mbed.org 0:5e1631496985 314 autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 315
root@mbed.org 0:5e1631496985 316 /* time to wait to first probe, this is randomly
root@mbed.org 0:5e1631496985 317 * choosen out of 0 to PROBE_WAIT seconds.
root@mbed.org 0:5e1631496985 318 * compliant to RFC 3927 Section 2.2.1
root@mbed.org 0:5e1631496985 319 */
root@mbed.org 0:5e1631496985 320 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
root@mbed.org 0:5e1631496985 321
root@mbed.org 0:5e1631496985 322 /*
root@mbed.org 0:5e1631496985 323 * if we tried more then MAX_CONFLICTS we must limit our rate for
root@mbed.org 0:5e1631496985 324 * accquiring and probing address
root@mbed.org 0:5e1631496985 325 * compliant to RFC 3927 Section 2.2.1
root@mbed.org 0:5e1631496985 326 */
root@mbed.org 0:5e1631496985 327 if(autoip->tried_llipaddr > MAX_CONFLICTS) {
root@mbed.org 0:5e1631496985 328 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 329 }
root@mbed.org 0:5e1631496985 330 }
root@mbed.org 0:5e1631496985 331
root@mbed.org 0:5e1631496985 332 /**
root@mbed.org 0:5e1631496985 333 * Handle a possible change in the network configuration.
root@mbed.org 0:5e1631496985 334 *
root@mbed.org 0:5e1631496985 335 * If there is an AutoIP address configured, take the interface down
root@mbed.org 0:5e1631496985 336 * and begin probing with the same address.
root@mbed.org 0:5e1631496985 337 */
root@mbed.org 0:5e1631496985 338 void
root@mbed.org 0:5e1631496985 339 autoip_network_changed(struct netif *netif)
root@mbed.org 0:5e1631496985 340 {
root@mbed.org 0:5e1631496985 341 if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
root@mbed.org 0:5e1631496985 342 netif_set_down(netif);
root@mbed.org 0:5e1631496985 343 autoip_start_probing(netif);
root@mbed.org 0:5e1631496985 344 }
root@mbed.org 0:5e1631496985 345 }
root@mbed.org 0:5e1631496985 346
root@mbed.org 0:5e1631496985 347 /**
root@mbed.org 0:5e1631496985 348 * Stop AutoIP client
root@mbed.org 0:5e1631496985 349 *
root@mbed.org 0:5e1631496985 350 * @param netif network interface on which stop the AutoIP client
root@mbed.org 0:5e1631496985 351 */
root@mbed.org 0:5e1631496985 352 err_t
root@mbed.org 0:5e1631496985 353 autoip_stop(struct netif *netif)
root@mbed.org 0:5e1631496985 354 {
root@mbed.org 0:5e1631496985 355 netif->autoip->state = AUTOIP_STATE_OFF;
root@mbed.org 0:5e1631496985 356 netif_set_down(netif);
root@mbed.org 0:5e1631496985 357 return ERR_OK;
root@mbed.org 0:5e1631496985 358 }
root@mbed.org 0:5e1631496985 359
root@mbed.org 0:5e1631496985 360 /**
root@mbed.org 0:5e1631496985 361 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
root@mbed.org 0:5e1631496985 362 */
root@mbed.org 0:5e1631496985 363 void
root@mbed.org 0:5e1631496985 364 autoip_tmr()
root@mbed.org 0:5e1631496985 365 {
root@mbed.org 0:5e1631496985 366 struct netif *netif = netif_list;
root@mbed.org 0:5e1631496985 367 /* loop through netif's */
root@mbed.org 0:5e1631496985 368 while (netif != NULL) {
root@mbed.org 0:5e1631496985 369 /* only act on AutoIP configured interfaces */
root@mbed.org 0:5e1631496985 370 if (netif->autoip != NULL) {
root@mbed.org 0:5e1631496985 371 if(netif->autoip->lastconflict > 0) {
root@mbed.org 0:5e1631496985 372 netif->autoip->lastconflict--;
root@mbed.org 0:5e1631496985 373 }
root@mbed.org 0:5e1631496985 374
root@mbed.org 0:5e1631496985 375 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
root@mbed.org 0:5e1631496985 376 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
root@mbed.org 0:5e1631496985 377 (u16_t)(netif->autoip->state), netif->autoip->ttw));
root@mbed.org 0:5e1631496985 378
root@mbed.org 0:5e1631496985 379 switch(netif->autoip->state) {
root@mbed.org 0:5e1631496985 380 case AUTOIP_STATE_PROBING:
root@mbed.org 0:5e1631496985 381 if(netif->autoip->ttw > 0) {
root@mbed.org 0:5e1631496985 382 netif->autoip->ttw--;
root@mbed.org 0:5e1631496985 383 } else {
root@mbed.org 0:5e1631496985 384 if(netif->autoip->sent_num >= PROBE_NUM) {
root@mbed.org 0:5e1631496985 385 netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
root@mbed.org 0:5e1631496985 386 netif->autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 387 netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 388 } else {
root@mbed.org 0:5e1631496985 389 autoip_arp_probe(netif);
root@mbed.org 0:5e1631496985 390 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
root@mbed.org 0:5e1631496985 391 ("autoip_tmr() PROBING Sent Probe\n"));
root@mbed.org 0:5e1631496985 392 netif->autoip->sent_num++;
root@mbed.org 0:5e1631496985 393 /* calculate time to wait to next probe */
root@mbed.org 0:5e1631496985 394 netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
root@mbed.org 0:5e1631496985 395 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
root@mbed.org 0:5e1631496985 396 PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
root@mbed.org 0:5e1631496985 397 }
root@mbed.org 0:5e1631496985 398 }
root@mbed.org 0:5e1631496985 399 break;
root@mbed.org 0:5e1631496985 400
root@mbed.org 0:5e1631496985 401 case AUTOIP_STATE_ANNOUNCING:
root@mbed.org 0:5e1631496985 402 if(netif->autoip->ttw > 0) {
root@mbed.org 0:5e1631496985 403 netif->autoip->ttw--;
root@mbed.org 0:5e1631496985 404 } else {
root@mbed.org 0:5e1631496985 405 if(netif->autoip->sent_num == 0) {
root@mbed.org 0:5e1631496985 406 /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
root@mbed.org 0:5e1631496985 407 * Now we can bind to an IP address and use it.
root@mbed.org 0:5e1631496985 408 *
root@mbed.org 0:5e1631496985 409 * autoip_bind calls netif_set_up. This triggers a gratuitous ARP
root@mbed.org 0:5e1631496985 410 * which counts as an announcement.
root@mbed.org 0:5e1631496985 411 */
root@mbed.org 0:5e1631496985 412 autoip_bind(netif);
root@mbed.org 0:5e1631496985 413 } else {
root@mbed.org 0:5e1631496985 414 autoip_arp_announce(netif);
root@mbed.org 0:5e1631496985 415 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
root@mbed.org 0:5e1631496985 416 ("autoip_tmr() ANNOUNCING Sent Announce\n"));
root@mbed.org 0:5e1631496985 417 }
root@mbed.org 0:5e1631496985 418 netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
root@mbed.org 0:5e1631496985 419 netif->autoip->sent_num++;
root@mbed.org 0:5e1631496985 420
root@mbed.org 0:5e1631496985 421 if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
root@mbed.org 0:5e1631496985 422 netif->autoip->state = AUTOIP_STATE_BOUND;
root@mbed.org 0:5e1631496985 423 netif->autoip->sent_num = 0;
root@mbed.org 0:5e1631496985 424 netif->autoip->ttw = 0;
root@mbed.org 0:5e1631496985 425 }
root@mbed.org 0:5e1631496985 426 }
root@mbed.org 0:5e1631496985 427 break;
root@mbed.org 0:5e1631496985 428 }
root@mbed.org 0:5e1631496985 429 }
root@mbed.org 0:5e1631496985 430 /* proceed to next network interface */
root@mbed.org 0:5e1631496985 431 netif = netif->next;
root@mbed.org 0:5e1631496985 432 }
root@mbed.org 0:5e1631496985 433 }
root@mbed.org 0:5e1631496985 434
root@mbed.org 0:5e1631496985 435 /**
root@mbed.org 0:5e1631496985 436 * Handles every incoming ARP Packet, called by etharp_arp_input.
root@mbed.org 0:5e1631496985 437 *
root@mbed.org 0:5e1631496985 438 * @param netif network interface to use for autoip processing
root@mbed.org 0:5e1631496985 439 * @param hdr Incoming ARP packet
root@mbed.org 0:5e1631496985 440 */
root@mbed.org 0:5e1631496985 441 void
root@mbed.org 0:5e1631496985 442 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
root@mbed.org 0:5e1631496985 443 {
root@mbed.org 0:5e1631496985 444 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_arp_reply()\n"));
root@mbed.org 0:5e1631496985 445 if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
root@mbed.org 0:5e1631496985 446 /* when ip.src == llipaddr && hw.src != netif->hwaddr
root@mbed.org 0:5e1631496985 447 *
root@mbed.org 0:5e1631496985 448 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
root@mbed.org 0:5e1631496985 449 * we have a conflict and must solve it
root@mbed.org 0:5e1631496985 450 */
root@mbed.org 0:5e1631496985 451 struct ip_addr sipaddr, dipaddr;
root@mbed.org 0:5e1631496985 452 struct eth_addr netifaddr;
root@mbed.org 0:5e1631496985 453 netifaddr.addr[0] = netif->hwaddr[0];
root@mbed.org 0:5e1631496985 454 netifaddr.addr[1] = netif->hwaddr[1];
root@mbed.org 0:5e1631496985 455 netifaddr.addr[2] = netif->hwaddr[2];
root@mbed.org 0:5e1631496985 456 netifaddr.addr[3] = netif->hwaddr[3];
root@mbed.org 0:5e1631496985 457 netifaddr.addr[4] = netif->hwaddr[4];
root@mbed.org 0:5e1631496985 458 netifaddr.addr[5] = netif->hwaddr[5];
root@mbed.org 0:5e1631496985 459
root@mbed.org 0:5e1631496985 460 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
root@mbed.org 0:5e1631496985 461 * structure packing (not using structure copy which breaks strict-aliasing rules).
root@mbed.org 0:5e1631496985 462 */
root@mbed.org 0:5e1631496985 463 SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
root@mbed.org 0:5e1631496985 464 SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
root@mbed.org 0:5e1631496985 465
root@mbed.org 0:5e1631496985 466 if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
root@mbed.org 0:5e1631496985 467 ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
root@mbed.org 0:5e1631496985 468 (netif->autoip->sent_num == 0))) {
root@mbed.org 0:5e1631496985 469 /* RFC 3927 Section 2.2.1:
root@mbed.org 0:5e1631496985 470 * from beginning to after ANNOUNCE_WAIT
root@mbed.org 0:5e1631496985 471 * seconds we have a conflict if
root@mbed.org 0:5e1631496985 472 * ip.src == llipaddr OR
root@mbed.org 0:5e1631496985 473 * ip.dst == llipaddr && hw.src != own hwaddr
root@mbed.org 0:5e1631496985 474 */
root@mbed.org 0:5e1631496985 475 if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
root@mbed.org 0:5e1631496985 476 (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
root@mbed.org 0:5e1631496985 477 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
root@mbed.org 0:5e1631496985 478 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 479 ("autoip_arp_reply(): Probe Conflict detected\n"));
root@mbed.org 0:5e1631496985 480 autoip_start(netif);
root@mbed.org 0:5e1631496985 481 }
root@mbed.org 0:5e1631496985 482 } else {
root@mbed.org 0:5e1631496985 483 /* RFC 3927 Section 2.5:
root@mbed.org 0:5e1631496985 484 * in any state we have a conflict if
root@mbed.org 0:5e1631496985 485 * ip.src == llipaddr && hw.src != own hwaddr
root@mbed.org 0:5e1631496985 486 */
root@mbed.org 0:5e1631496985 487 if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
root@mbed.org 0:5e1631496985 488 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
root@mbed.org 0:5e1631496985 489 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
root@mbed.org 0:5e1631496985 490 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
root@mbed.org 0:5e1631496985 491 autoip_handle_arp_conflict(netif);
root@mbed.org 0:5e1631496985 492 }
root@mbed.org 0:5e1631496985 493 }
root@mbed.org 0:5e1631496985 494 }
root@mbed.org 0:5e1631496985 495 }
root@mbed.org 0:5e1631496985 496
root@mbed.org 0:5e1631496985 497 #endif /* LWIP_AUTOIP */