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EthernetInterface/lwip/core/ipv4/autoip.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * AutoIP Automatic LinkLocal IP Configuration
GordonSin 0:0ed2a7c7190c 4 *
GordonSin 0:0ed2a7c7190c 5 */
GordonSin 0:0ed2a7c7190c 6
GordonSin 0:0ed2a7c7190c 7 /*
GordonSin 0:0ed2a7c7190c 8 *
GordonSin 0:0ed2a7c7190c 9 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
GordonSin 0:0ed2a7c7190c 10 * All rights reserved.
GordonSin 0:0ed2a7c7190c 11 *
GordonSin 0:0ed2a7c7190c 12 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 13 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 14 *
GordonSin 0:0ed2a7c7190c 15 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 16 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 18 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 19 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 20 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 21 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 22 *
GordonSin 0:0ed2a7c7190c 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 32 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 33 *
GordonSin 0:0ed2a7c7190c 34 * Author: Dominik Spies <kontakt@dspies.de>
GordonSin 0:0ed2a7c7190c 35 *
GordonSin 0:0ed2a7c7190c 36 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
GordonSin 0:0ed2a7c7190c 37 * with RFC 3927.
GordonSin 0:0ed2a7c7190c 38 *
GordonSin 0:0ed2a7c7190c 39 *
GordonSin 0:0ed2a7c7190c 40 * Please coordinate changes and requests with Dominik Spies
GordonSin 0:0ed2a7c7190c 41 * <kontakt@dspies.de>
GordonSin 0:0ed2a7c7190c 42 */
GordonSin 0:0ed2a7c7190c 43
GordonSin 0:0ed2a7c7190c 44 /*******************************************************************************
GordonSin 0:0ed2a7c7190c 45 * USAGE:
GordonSin 0:0ed2a7c7190c 46 *
GordonSin 0:0ed2a7c7190c 47 * define LWIP_AUTOIP 1 in your lwipopts.h
GordonSin 0:0ed2a7c7190c 48 *
GordonSin 0:0ed2a7c7190c 49 * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
GordonSin 0:0ed2a7c7190c 50 * - First, call autoip_init().
GordonSin 0:0ed2a7c7190c 51 * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
GordonSin 0:0ed2a7c7190c 52 * that should be defined in autoip.h.
GordonSin 0:0ed2a7c7190c 53 * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
GordonSin 0:0ed2a7c7190c 54 * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
GordonSin 0:0ed2a7c7190c 55 *
GordonSin 0:0ed2a7c7190c 56 * Without DHCP:
GordonSin 0:0ed2a7c7190c 57 * - Call autoip_start() after netif_add().
GordonSin 0:0ed2a7c7190c 58 *
GordonSin 0:0ed2a7c7190c 59 * With DHCP:
GordonSin 0:0ed2a7c7190c 60 * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
GordonSin 0:0ed2a7c7190c 61 * - Configure your DHCP Client.
GordonSin 0:0ed2a7c7190c 62 *
GordonSin 0:0ed2a7c7190c 63 */
GordonSin 0:0ed2a7c7190c 64
GordonSin 0:0ed2a7c7190c 65 #include "lwip/opt.h"
GordonSin 0:0ed2a7c7190c 66
GordonSin 0:0ed2a7c7190c 67 #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
GordonSin 0:0ed2a7c7190c 68
GordonSin 0:0ed2a7c7190c 69 #include "lwip/mem.h"
GordonSin 0:0ed2a7c7190c 70 #include "lwip/udp.h"
GordonSin 0:0ed2a7c7190c 71 #include "lwip/ip_addr.h"
GordonSin 0:0ed2a7c7190c 72 #include "lwip/netif.h"
GordonSin 0:0ed2a7c7190c 73 #include "lwip/autoip.h"
GordonSin 0:0ed2a7c7190c 74 #include "netif/etharp.h"
GordonSin 0:0ed2a7c7190c 75
GordonSin 0:0ed2a7c7190c 76 #include <stdlib.h>
GordonSin 0:0ed2a7c7190c 77 #include <string.h>
GordonSin 0:0ed2a7c7190c 78
GordonSin 0:0ed2a7c7190c 79 /* 169.254.0.0 */
GordonSin 0:0ed2a7c7190c 80 #define AUTOIP_NET 0xA9FE0000
GordonSin 0:0ed2a7c7190c 81 /* 169.254.1.0 */
GordonSin 0:0ed2a7c7190c 82 #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
GordonSin 0:0ed2a7c7190c 83 /* 169.254.254.255 */
GordonSin 0:0ed2a7c7190c 84 #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
GordonSin 0:0ed2a7c7190c 85
GordonSin 0:0ed2a7c7190c 86
GordonSin 0:0ed2a7c7190c 87 /** Pseudo random macro based on netif informations.
GordonSin 0:0ed2a7c7190c 88 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
GordonSin 0:0ed2a7c7190c 89 #ifndef LWIP_AUTOIP_RAND
GordonSin 0:0ed2a7c7190c 90 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
GordonSin 0:0ed2a7c7190c 91 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
GordonSin 0:0ed2a7c7190c 92 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
GordonSin 0:0ed2a7c7190c 93 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
GordonSin 0:0ed2a7c7190c 94 (netif->autoip?netif->autoip->tried_llipaddr:0))
GordonSin 0:0ed2a7c7190c 95 #endif /* LWIP_AUTOIP_RAND */
GordonSin 0:0ed2a7c7190c 96
GordonSin 0:0ed2a7c7190c 97 /**
GordonSin 0:0ed2a7c7190c 98 * Macro that generates the initial IP address to be tried by AUTOIP.
GordonSin 0:0ed2a7c7190c 99 * If you want to override this, define it to something else in lwipopts.h.
GordonSin 0:0ed2a7c7190c 100 */
GordonSin 0:0ed2a7c7190c 101 #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
GordonSin 0:0ed2a7c7190c 102 #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
GordonSin 0:0ed2a7c7190c 103 htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
GordonSin 0:0ed2a7c7190c 104 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
GordonSin 0:0ed2a7c7190c 105 #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
GordonSin 0:0ed2a7c7190c 106
GordonSin 0:0ed2a7c7190c 107 /* static functions */
GordonSin 0:0ed2a7c7190c 108 static void autoip_handle_arp_conflict(struct netif *netif);
GordonSin 0:0ed2a7c7190c 109
GordonSin 0:0ed2a7c7190c 110 /* creates a pseudo random LL IP-Address for a network interface */
GordonSin 0:0ed2a7c7190c 111 static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr);
GordonSin 0:0ed2a7c7190c 112
GordonSin 0:0ed2a7c7190c 113 /* sends an ARP probe */
GordonSin 0:0ed2a7c7190c 114 static err_t autoip_arp_probe(struct netif *netif);
GordonSin 0:0ed2a7c7190c 115
GordonSin 0:0ed2a7c7190c 116 /* sends an ARP announce */
GordonSin 0:0ed2a7c7190c 117 static err_t autoip_arp_announce(struct netif *netif);
GordonSin 0:0ed2a7c7190c 118
GordonSin 0:0ed2a7c7190c 119 /* configure interface for use with current LL IP-Address */
GordonSin 0:0ed2a7c7190c 120 static err_t autoip_bind(struct netif *netif);
GordonSin 0:0ed2a7c7190c 121
GordonSin 0:0ed2a7c7190c 122 /* start sending probes for llipaddr */
GordonSin 0:0ed2a7c7190c 123 static void autoip_start_probing(struct netif *netif);
GordonSin 0:0ed2a7c7190c 124
GordonSin 0:0ed2a7c7190c 125 /**
GordonSin 0:0ed2a7c7190c 126 * Initialize this module
GordonSin 0:0ed2a7c7190c 127 */
GordonSin 0:0ed2a7c7190c 128 void
GordonSin 0:0ed2a7c7190c 129 autoip_init(void)
GordonSin 0:0ed2a7c7190c 130 {
GordonSin 0:0ed2a7c7190c 131 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_init()\n"));
GordonSin 0:0ed2a7c7190c 132 }
GordonSin 0:0ed2a7c7190c 133
GordonSin 0:0ed2a7c7190c 134 /** Set a statically allocated struct autoip to work with.
GordonSin 0:0ed2a7c7190c 135 * Using this prevents autoip_start to allocate it using mem_malloc.
GordonSin 0:0ed2a7c7190c 136 *
GordonSin 0:0ed2a7c7190c 137 * @param netif the netif for which to set the struct autoip
GordonSin 0:0ed2a7c7190c 138 * @param dhcp (uninitialised) dhcp struct allocated by the application
GordonSin 0:0ed2a7c7190c 139 */
GordonSin 0:0ed2a7c7190c 140 void
GordonSin 0:0ed2a7c7190c 141 autoip_set_struct(struct netif *netif, struct autoip *autoip)
GordonSin 0:0ed2a7c7190c 142 {
GordonSin 0:0ed2a7c7190c 143 LWIP_ASSERT("netif != NULL", netif != NULL);
GordonSin 0:0ed2a7c7190c 144 LWIP_ASSERT("autoip != NULL", autoip != NULL);
GordonSin 0:0ed2a7c7190c 145 LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
GordonSin 0:0ed2a7c7190c 146
GordonSin 0:0ed2a7c7190c 147 /* clear data structure */
GordonSin 0:0ed2a7c7190c 148 memset(autoip, 0, sizeof(struct autoip));
GordonSin 0:0ed2a7c7190c 149 /* autoip->state = AUTOIP_STATE_OFF; */
GordonSin 0:0ed2a7c7190c 150 netif->autoip = autoip;
GordonSin 0:0ed2a7c7190c 151 }
GordonSin 0:0ed2a7c7190c 152
GordonSin 0:0ed2a7c7190c 153 /** Restart AutoIP client and check the next address (conflict detected)
GordonSin 0:0ed2a7c7190c 154 *
GordonSin 0:0ed2a7c7190c 155 * @param netif The netif under AutoIP control
GordonSin 0:0ed2a7c7190c 156 */
GordonSin 0:0ed2a7c7190c 157 static void
GordonSin 0:0ed2a7c7190c 158 autoip_restart(struct netif *netif)
GordonSin 0:0ed2a7c7190c 159 {
GordonSin 0:0ed2a7c7190c 160 netif->autoip->tried_llipaddr++;
GordonSin 0:0ed2a7c7190c 161 autoip_start(netif);
GordonSin 0:0ed2a7c7190c 162 }
GordonSin 0:0ed2a7c7190c 163
GordonSin 0:0ed2a7c7190c 164 /**
GordonSin 0:0ed2a7c7190c 165 * Handle a IP address conflict after an ARP conflict detection
GordonSin 0:0ed2a7c7190c 166 */
GordonSin 0:0ed2a7c7190c 167 static void
GordonSin 0:0ed2a7c7190c 168 autoip_handle_arp_conflict(struct netif *netif)
GordonSin 0:0ed2a7c7190c 169 {
GordonSin 0:0ed2a7c7190c 170 /* Somehow detect if we are defending or retreating */
GordonSin 0:0ed2a7c7190c 171 unsigned char defend = 1; /* tbd */
GordonSin 0:0ed2a7c7190c 172
GordonSin 0:0ed2a7c7190c 173 if(defend) {
GordonSin 0:0ed2a7c7190c 174 if(netif->autoip->lastconflict > 0) {
GordonSin 0:0ed2a7c7190c 175 /* retreat, there was a conflicting ARP in the last
GordonSin 0:0ed2a7c7190c 176 * DEFEND_INTERVAL seconds
GordonSin 0:0ed2a7c7190c 177 */
GordonSin 0:0ed2a7c7190c 178 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 179 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
GordonSin 0:0ed2a7c7190c 180
GordonSin 0:0ed2a7c7190c 181 /* TODO: close all TCP sessions */
GordonSin 0:0ed2a7c7190c 182 autoip_restart(netif);
GordonSin 0:0ed2a7c7190c 183 } else {
GordonSin 0:0ed2a7c7190c 184 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 185 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
GordonSin 0:0ed2a7c7190c 186 autoip_arp_announce(netif);
GordonSin 0:0ed2a7c7190c 187 netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
GordonSin 0:0ed2a7c7190c 188 }
GordonSin 0:0ed2a7c7190c 189 } else {
GordonSin 0:0ed2a7c7190c 190 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 191 ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
GordonSin 0:0ed2a7c7190c 192 /* TODO: close all TCP sessions */
GordonSin 0:0ed2a7c7190c 193 autoip_restart(netif);
GordonSin 0:0ed2a7c7190c 194 }
GordonSin 0:0ed2a7c7190c 195 }
GordonSin 0:0ed2a7c7190c 196
GordonSin 0:0ed2a7c7190c 197 /**
GordonSin 0:0ed2a7c7190c 198 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
GordonSin 0:0ed2a7c7190c 199 *
GordonSin 0:0ed2a7c7190c 200 * @param netif network interface on which create the IP-Address
GordonSin 0:0ed2a7c7190c 201 * @param ipaddr ip address to initialize
GordonSin 0:0ed2a7c7190c 202 */
GordonSin 0:0ed2a7c7190c 203 static void
GordonSin 0:0ed2a7c7190c 204 autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr)
GordonSin 0:0ed2a7c7190c 205 {
GordonSin 0:0ed2a7c7190c 206 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
GordonSin 0:0ed2a7c7190c 207 * compliant to RFC 3927 Section 2.1
GordonSin 0:0ed2a7c7190c 208 * We have 254 * 256 possibilities */
GordonSin 0:0ed2a7c7190c 209
GordonSin 0:0ed2a7c7190c 210 u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
GordonSin 0:0ed2a7c7190c 211 addr += netif->autoip->tried_llipaddr;
GordonSin 0:0ed2a7c7190c 212 addr = AUTOIP_NET | (addr & 0xffff);
GordonSin 0:0ed2a7c7190c 213 /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
GordonSin 0:0ed2a7c7190c 214
GordonSin 0:0ed2a7c7190c 215 if (addr < AUTOIP_RANGE_START) {
GordonSin 0:0ed2a7c7190c 216 addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
GordonSin 0:0ed2a7c7190c 217 }
GordonSin 0:0ed2a7c7190c 218 if (addr > AUTOIP_RANGE_END) {
GordonSin 0:0ed2a7c7190c 219 addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
GordonSin 0:0ed2a7c7190c 220 }
GordonSin 0:0ed2a7c7190c 221 LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
GordonSin 0:0ed2a7c7190c 222 (addr <= AUTOIP_RANGE_END));
GordonSin 0:0ed2a7c7190c 223 ip4_addr_set_u32(ipaddr, htonl(addr));
GordonSin 0:0ed2a7c7190c 224
GordonSin 0:0ed2a7c7190c 225 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 226 ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 227 (u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
GordonSin 0:0ed2a7c7190c 228 ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
GordonSin 0:0ed2a7c7190c 229 }
GordonSin 0:0ed2a7c7190c 230
GordonSin 0:0ed2a7c7190c 231 /**
GordonSin 0:0ed2a7c7190c 232 * Sends an ARP probe from a network interface
GordonSin 0:0ed2a7c7190c 233 *
GordonSin 0:0ed2a7c7190c 234 * @param netif network interface used to send the probe
GordonSin 0:0ed2a7c7190c 235 */
GordonSin 0:0ed2a7c7190c 236 static err_t
GordonSin 0:0ed2a7c7190c 237 autoip_arp_probe(struct netif *netif)
GordonSin 0:0ed2a7c7190c 238 {
GordonSin 0:0ed2a7c7190c 239 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
GordonSin 0:0ed2a7c7190c 240 (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
GordonSin 0:0ed2a7c7190c 241 &netif->autoip->llipaddr, ARP_REQUEST);
GordonSin 0:0ed2a7c7190c 242 }
GordonSin 0:0ed2a7c7190c 243
GordonSin 0:0ed2a7c7190c 244 /**
GordonSin 0:0ed2a7c7190c 245 * Sends an ARP announce from a network interface
GordonSin 0:0ed2a7c7190c 246 *
GordonSin 0:0ed2a7c7190c 247 * @param netif network interface used to send the announce
GordonSin 0:0ed2a7c7190c 248 */
GordonSin 0:0ed2a7c7190c 249 static err_t
GordonSin 0:0ed2a7c7190c 250 autoip_arp_announce(struct netif *netif)
GordonSin 0:0ed2a7c7190c 251 {
GordonSin 0:0ed2a7c7190c 252 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
GordonSin 0:0ed2a7c7190c 253 (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
GordonSin 0:0ed2a7c7190c 254 &netif->autoip->llipaddr, ARP_REQUEST);
GordonSin 0:0ed2a7c7190c 255 }
GordonSin 0:0ed2a7c7190c 256
GordonSin 0:0ed2a7c7190c 257 /**
GordonSin 0:0ed2a7c7190c 258 * Configure interface for use with current LL IP-Address
GordonSin 0:0ed2a7c7190c 259 *
GordonSin 0:0ed2a7c7190c 260 * @param netif network interface to configure with current LL IP-Address
GordonSin 0:0ed2a7c7190c 261 */
GordonSin 0:0ed2a7c7190c 262 static err_t
GordonSin 0:0ed2a7c7190c 263 autoip_bind(struct netif *netif)
GordonSin 0:0ed2a7c7190c 264 {
GordonSin 0:0ed2a7c7190c 265 struct autoip *autoip = netif->autoip;
GordonSin 0:0ed2a7c7190c 266 ip_addr_t sn_mask, gw_addr;
GordonSin 0:0ed2a7c7190c 267
GordonSin 0:0ed2a7c7190c 268 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 269 ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 270 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
GordonSin 0:0ed2a7c7190c 271 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
GordonSin 0:0ed2a7c7190c 272 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
GordonSin 0:0ed2a7c7190c 273
GordonSin 0:0ed2a7c7190c 274 IP4_ADDR(&sn_mask, 255, 255, 0, 0);
GordonSin 0:0ed2a7c7190c 275 IP4_ADDR(&gw_addr, 0, 0, 0, 0);
GordonSin 0:0ed2a7c7190c 276
GordonSin 0:0ed2a7c7190c 277 netif_set_ipaddr(netif, &autoip->llipaddr);
GordonSin 0:0ed2a7c7190c 278 netif_set_netmask(netif, &sn_mask);
GordonSin 0:0ed2a7c7190c 279 netif_set_gw(netif, &gw_addr);
GordonSin 0:0ed2a7c7190c 280
GordonSin 0:0ed2a7c7190c 281 /* bring the interface up */
GordonSin 0:0ed2a7c7190c 282 netif_set_up(netif);
GordonSin 0:0ed2a7c7190c 283
GordonSin 0:0ed2a7c7190c 284 return ERR_OK;
GordonSin 0:0ed2a7c7190c 285 }
GordonSin 0:0ed2a7c7190c 286
GordonSin 0:0ed2a7c7190c 287 /**
GordonSin 0:0ed2a7c7190c 288 * Start AutoIP client
GordonSin 0:0ed2a7c7190c 289 *
GordonSin 0:0ed2a7c7190c 290 * @param netif network interface on which start the AutoIP client
GordonSin 0:0ed2a7c7190c 291 */
GordonSin 0:0ed2a7c7190c 292 err_t
GordonSin 0:0ed2a7c7190c 293 autoip_start(struct netif *netif)
GordonSin 0:0ed2a7c7190c 294 {
GordonSin 0:0ed2a7c7190c 295 struct autoip *autoip = netif->autoip;
GordonSin 0:0ed2a7c7190c 296 err_t result = ERR_OK;
GordonSin 0:0ed2a7c7190c 297
GordonSin 0:0ed2a7c7190c 298 if(netif_is_up(netif)) {
GordonSin 0:0ed2a7c7190c 299 netif_set_down(netif);
GordonSin 0:0ed2a7c7190c 300 }
GordonSin 0:0ed2a7c7190c 301
GordonSin 0:0ed2a7c7190c 302 /* Set IP-Address, Netmask and Gateway to 0 to make sure that
GordonSin 0:0ed2a7c7190c 303 * ARP Packets are formed correctly
GordonSin 0:0ed2a7c7190c 304 */
GordonSin 0:0ed2a7c7190c 305 ip_addr_set_zero(&netif->ip_addr);
GordonSin 0:0ed2a7c7190c 306 ip_addr_set_zero(&netif->netmask);
GordonSin 0:0ed2a7c7190c 307 ip_addr_set_zero(&netif->gw);
GordonSin 0:0ed2a7c7190c 308
GordonSin 0:0ed2a7c7190c 309 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 310 ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
GordonSin 0:0ed2a7c7190c 311 netif->name[1], (u16_t)netif->num));
GordonSin 0:0ed2a7c7190c 312 if(autoip == NULL) {
GordonSin 0:0ed2a7c7190c 313 /* no AutoIP client attached yet? */
GordonSin 0:0ed2a7c7190c 314 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 315 ("autoip_start(): starting new AUTOIP client\n"));
GordonSin 0:0ed2a7c7190c 316 autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
GordonSin 0:0ed2a7c7190c 317 if(autoip == NULL) {
GordonSin 0:0ed2a7c7190c 318 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 319 ("autoip_start(): could not allocate autoip\n"));
GordonSin 0:0ed2a7c7190c 320 return ERR_MEM;
GordonSin 0:0ed2a7c7190c 321 }
GordonSin 0:0ed2a7c7190c 322 memset(autoip, 0, sizeof(struct autoip));
GordonSin 0:0ed2a7c7190c 323 /* store this AutoIP client in the netif */
GordonSin 0:0ed2a7c7190c 324 netif->autoip = autoip;
GordonSin 0:0ed2a7c7190c 325 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
GordonSin 0:0ed2a7c7190c 326 } else {
GordonSin 0:0ed2a7c7190c 327 autoip->state = AUTOIP_STATE_OFF;
GordonSin 0:0ed2a7c7190c 328 autoip->ttw = 0;
GordonSin 0:0ed2a7c7190c 329 autoip->sent_num = 0;
GordonSin 0:0ed2a7c7190c 330 ip_addr_set_zero(&autoip->llipaddr);
GordonSin 0:0ed2a7c7190c 331 autoip->lastconflict = 0;
GordonSin 0:0ed2a7c7190c 332 }
GordonSin 0:0ed2a7c7190c 333
GordonSin 0:0ed2a7c7190c 334 autoip_create_addr(netif, &(autoip->llipaddr));
GordonSin 0:0ed2a7c7190c 335 autoip_start_probing(netif);
GordonSin 0:0ed2a7c7190c 336
GordonSin 0:0ed2a7c7190c 337 return result;
GordonSin 0:0ed2a7c7190c 338 }
GordonSin 0:0ed2a7c7190c 339
GordonSin 0:0ed2a7c7190c 340 static void
GordonSin 0:0ed2a7c7190c 341 autoip_start_probing(struct netif *netif)
GordonSin 0:0ed2a7c7190c 342 {
GordonSin 0:0ed2a7c7190c 343 struct autoip *autoip = netif->autoip;
GordonSin 0:0ed2a7c7190c 344
GordonSin 0:0ed2a7c7190c 345 autoip->state = AUTOIP_STATE_PROBING;
GordonSin 0:0ed2a7c7190c 346 autoip->sent_num = 0;
GordonSin 0:0ed2a7c7190c 347 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 348 ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 349 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
GordonSin 0:0ed2a7c7190c 350 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
GordonSin 0:0ed2a7c7190c 351
GordonSin 0:0ed2a7c7190c 352 /* time to wait to first probe, this is randomly
GordonSin 0:0ed2a7c7190c 353 * choosen out of 0 to PROBE_WAIT seconds.
GordonSin 0:0ed2a7c7190c 354 * compliant to RFC 3927 Section 2.2.1
GordonSin 0:0ed2a7c7190c 355 */
GordonSin 0:0ed2a7c7190c 356 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
GordonSin 0:0ed2a7c7190c 357
GordonSin 0:0ed2a7c7190c 358 /*
GordonSin 0:0ed2a7c7190c 359 * if we tried more then MAX_CONFLICTS we must limit our rate for
GordonSin 0:0ed2a7c7190c 360 * accquiring and probing address
GordonSin 0:0ed2a7c7190c 361 * compliant to RFC 3927 Section 2.2.1
GordonSin 0:0ed2a7c7190c 362 */
GordonSin 0:0ed2a7c7190c 363 if(autoip->tried_llipaddr > MAX_CONFLICTS) {
GordonSin 0:0ed2a7c7190c 364 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
GordonSin 0:0ed2a7c7190c 365 }
GordonSin 0:0ed2a7c7190c 366 }
GordonSin 0:0ed2a7c7190c 367
GordonSin 0:0ed2a7c7190c 368 /**
GordonSin 0:0ed2a7c7190c 369 * Handle a possible change in the network configuration.
GordonSin 0:0ed2a7c7190c 370 *
GordonSin 0:0ed2a7c7190c 371 * If there is an AutoIP address configured, take the interface down
GordonSin 0:0ed2a7c7190c 372 * and begin probing with the same address.
GordonSin 0:0ed2a7c7190c 373 */
GordonSin 0:0ed2a7c7190c 374 void
GordonSin 0:0ed2a7c7190c 375 autoip_network_changed(struct netif *netif)
GordonSin 0:0ed2a7c7190c 376 {
GordonSin 0:0ed2a7c7190c 377 if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
GordonSin 0:0ed2a7c7190c 378 netif_set_down(netif);
GordonSin 0:0ed2a7c7190c 379 autoip_start_probing(netif);
GordonSin 0:0ed2a7c7190c 380 }
GordonSin 0:0ed2a7c7190c 381 }
GordonSin 0:0ed2a7c7190c 382
GordonSin 0:0ed2a7c7190c 383 /**
GordonSin 0:0ed2a7c7190c 384 * Stop AutoIP client
GordonSin 0:0ed2a7c7190c 385 *
GordonSin 0:0ed2a7c7190c 386 * @param netif network interface on which stop the AutoIP client
GordonSin 0:0ed2a7c7190c 387 */
GordonSin 0:0ed2a7c7190c 388 err_t
GordonSin 0:0ed2a7c7190c 389 autoip_stop(struct netif *netif)
GordonSin 0:0ed2a7c7190c 390 {
GordonSin 0:0ed2a7c7190c 391 netif->autoip->state = AUTOIP_STATE_OFF;
GordonSin 0:0ed2a7c7190c 392 netif_set_down(netif);
GordonSin 0:0ed2a7c7190c 393 return ERR_OK;
GordonSin 0:0ed2a7c7190c 394 }
GordonSin 0:0ed2a7c7190c 395
GordonSin 0:0ed2a7c7190c 396 /**
GordonSin 0:0ed2a7c7190c 397 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
GordonSin 0:0ed2a7c7190c 398 */
GordonSin 0:0ed2a7c7190c 399 void
GordonSin 0:0ed2a7c7190c 400 autoip_tmr()
GordonSin 0:0ed2a7c7190c 401 {
GordonSin 0:0ed2a7c7190c 402 struct netif *netif = netif_list;
GordonSin 0:0ed2a7c7190c 403 /* loop through netif's */
GordonSin 0:0ed2a7c7190c 404 while (netif != NULL) {
GordonSin 0:0ed2a7c7190c 405 /* only act on AutoIP configured interfaces */
GordonSin 0:0ed2a7c7190c 406 if (netif->autoip != NULL) {
GordonSin 0:0ed2a7c7190c 407 if(netif->autoip->lastconflict > 0) {
GordonSin 0:0ed2a7c7190c 408 netif->autoip->lastconflict--;
GordonSin 0:0ed2a7c7190c 409 }
GordonSin 0:0ed2a7c7190c 410
GordonSin 0:0ed2a7c7190c 411 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 412 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 413 (u16_t)(netif->autoip->state), netif->autoip->ttw));
GordonSin 0:0ed2a7c7190c 414
GordonSin 0:0ed2a7c7190c 415 switch(netif->autoip->state) {
GordonSin 0:0ed2a7c7190c 416 case AUTOIP_STATE_PROBING:
GordonSin 0:0ed2a7c7190c 417 if(netif->autoip->ttw > 0) {
GordonSin 0:0ed2a7c7190c 418 netif->autoip->ttw--;
GordonSin 0:0ed2a7c7190c 419 } else {
GordonSin 0:0ed2a7c7190c 420 if(netif->autoip->sent_num >= PROBE_NUM) {
GordonSin 0:0ed2a7c7190c 421 netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
GordonSin 0:0ed2a7c7190c 422 netif->autoip->sent_num = 0;
GordonSin 0:0ed2a7c7190c 423 netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
GordonSin 0:0ed2a7c7190c 424 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 425 ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 426 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
GordonSin 0:0ed2a7c7190c 427 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
GordonSin 0:0ed2a7c7190c 428 } else {
GordonSin 0:0ed2a7c7190c 429 autoip_arp_probe(netif);
GordonSin 0:0ed2a7c7190c 430 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 431 ("autoip_tmr() PROBING Sent Probe\n"));
GordonSin 0:0ed2a7c7190c 432 netif->autoip->sent_num++;
GordonSin 0:0ed2a7c7190c 433 /* calculate time to wait to next probe */
GordonSin 0:0ed2a7c7190c 434 netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
GordonSin 0:0ed2a7c7190c 435 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
GordonSin 0:0ed2a7c7190c 436 PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
GordonSin 0:0ed2a7c7190c 437 }
GordonSin 0:0ed2a7c7190c 438 }
GordonSin 0:0ed2a7c7190c 439 break;
GordonSin 0:0ed2a7c7190c 440
GordonSin 0:0ed2a7c7190c 441 case AUTOIP_STATE_ANNOUNCING:
GordonSin 0:0ed2a7c7190c 442 if(netif->autoip->ttw > 0) {
GordonSin 0:0ed2a7c7190c 443 netif->autoip->ttw--;
GordonSin 0:0ed2a7c7190c 444 } else {
GordonSin 0:0ed2a7c7190c 445 if(netif->autoip->sent_num == 0) {
GordonSin 0:0ed2a7c7190c 446 /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
GordonSin 0:0ed2a7c7190c 447 * Now we can bind to an IP address and use it.
GordonSin 0:0ed2a7c7190c 448 *
GordonSin 0:0ed2a7c7190c 449 * autoip_bind calls netif_set_up. This triggers a gratuitous ARP
GordonSin 0:0ed2a7c7190c 450 * which counts as an announcement.
GordonSin 0:0ed2a7c7190c 451 */
GordonSin 0:0ed2a7c7190c 452 autoip_bind(netif);
GordonSin 0:0ed2a7c7190c 453 } else {
GordonSin 0:0ed2a7c7190c 454 autoip_arp_announce(netif);
GordonSin 0:0ed2a7c7190c 455 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
GordonSin 0:0ed2a7c7190c 456 ("autoip_tmr() ANNOUNCING Sent Announce\n"));
GordonSin 0:0ed2a7c7190c 457 }
GordonSin 0:0ed2a7c7190c 458 netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
GordonSin 0:0ed2a7c7190c 459 netif->autoip->sent_num++;
GordonSin 0:0ed2a7c7190c 460
GordonSin 0:0ed2a7c7190c 461 if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
GordonSin 0:0ed2a7c7190c 462 netif->autoip->state = AUTOIP_STATE_BOUND;
GordonSin 0:0ed2a7c7190c 463 netif->autoip->sent_num = 0;
GordonSin 0:0ed2a7c7190c 464 netif->autoip->ttw = 0;
GordonSin 0:0ed2a7c7190c 465 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
GordonSin 0:0ed2a7c7190c 466 ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 467 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
GordonSin 0:0ed2a7c7190c 468 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
GordonSin 0:0ed2a7c7190c 469 }
GordonSin 0:0ed2a7c7190c 470 }
GordonSin 0:0ed2a7c7190c 471 break;
GordonSin 0:0ed2a7c7190c 472 }
GordonSin 0:0ed2a7c7190c 473 }
GordonSin 0:0ed2a7c7190c 474 /* proceed to next network interface */
GordonSin 0:0ed2a7c7190c 475 netif = netif->next;
GordonSin 0:0ed2a7c7190c 476 }
GordonSin 0:0ed2a7c7190c 477 }
GordonSin 0:0ed2a7c7190c 478
GordonSin 0:0ed2a7c7190c 479 /**
GordonSin 0:0ed2a7c7190c 480 * Handles every incoming ARP Packet, called by etharp_arp_input.
GordonSin 0:0ed2a7c7190c 481 *
GordonSin 0:0ed2a7c7190c 482 * @param netif network interface to use for autoip processing
GordonSin 0:0ed2a7c7190c 483 * @param hdr Incoming ARP packet
GordonSin 0:0ed2a7c7190c 484 */
GordonSin 0:0ed2a7c7190c 485 void
GordonSin 0:0ed2a7c7190c 486 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
GordonSin 0:0ed2a7c7190c 487 {
GordonSin 0:0ed2a7c7190c 488 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
GordonSin 0:0ed2a7c7190c 489 if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
GordonSin 0:0ed2a7c7190c 490 /* when ip.src == llipaddr && hw.src != netif->hwaddr
GordonSin 0:0ed2a7c7190c 491 *
GordonSin 0:0ed2a7c7190c 492 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
GordonSin 0:0ed2a7c7190c 493 * we have a conflict and must solve it
GordonSin 0:0ed2a7c7190c 494 */
GordonSin 0:0ed2a7c7190c 495 ip_addr_t sipaddr, dipaddr;
GordonSin 0:0ed2a7c7190c 496 struct eth_addr netifaddr;
GordonSin 0:0ed2a7c7190c 497 ETHADDR16_COPY(netifaddr.addr, netif->hwaddr);
GordonSin 0:0ed2a7c7190c 498
GordonSin 0:0ed2a7c7190c 499 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
GordonSin 0:0ed2a7c7190c 500 * structure packing (not using structure copy which breaks strict-aliasing rules).
GordonSin 0:0ed2a7c7190c 501 */
GordonSin 0:0ed2a7c7190c 502 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
GordonSin 0:0ed2a7c7190c 503 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
GordonSin 0:0ed2a7c7190c 504
GordonSin 0:0ed2a7c7190c 505 if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
GordonSin 0:0ed2a7c7190c 506 ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
GordonSin 0:0ed2a7c7190c 507 (netif->autoip->sent_num == 0))) {
GordonSin 0:0ed2a7c7190c 508 /* RFC 3927 Section 2.2.1:
GordonSin 0:0ed2a7c7190c 509 * from beginning to after ANNOUNCE_WAIT
GordonSin 0:0ed2a7c7190c 510 * seconds we have a conflict if
GordonSin 0:0ed2a7c7190c 511 * ip.src == llipaddr OR
GordonSin 0:0ed2a7c7190c 512 * ip.dst == llipaddr && hw.src != own hwaddr
GordonSin 0:0ed2a7c7190c 513 */
GordonSin 0:0ed2a7c7190c 514 if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
GordonSin 0:0ed2a7c7190c 515 (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
GordonSin 0:0ed2a7c7190c 516 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
GordonSin 0:0ed2a7c7190c 517 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
GordonSin 0:0ed2a7c7190c 518 ("autoip_arp_reply(): Probe Conflict detected\n"));
GordonSin 0:0ed2a7c7190c 519 autoip_restart(netif);
GordonSin 0:0ed2a7c7190c 520 }
GordonSin 0:0ed2a7c7190c 521 } else {
GordonSin 0:0ed2a7c7190c 522 /* RFC 3927 Section 2.5:
GordonSin 0:0ed2a7c7190c 523 * in any state we have a conflict if
GordonSin 0:0ed2a7c7190c 524 * ip.src == llipaddr && hw.src != own hwaddr
GordonSin 0:0ed2a7c7190c 525 */
GordonSin 0:0ed2a7c7190c 526 if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
GordonSin 0:0ed2a7c7190c 527 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
GordonSin 0:0ed2a7c7190c 528 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
GordonSin 0:0ed2a7c7190c 529 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
GordonSin 0:0ed2a7c7190c 530 autoip_handle_arp_conflict(netif);
GordonSin 0:0ed2a7c7190c 531 }
GordonSin 0:0ed2a7c7190c 532 }
GordonSin 0:0ed2a7c7190c 533 }
GordonSin 0:0ed2a7c7190c 534 }
GordonSin 0:0ed2a7c7190c 535
GordonSin 0:0ed2a7c7190c 536 #endif /* LWIP_AUTOIP */