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lwip/core/ipv4/autoip.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * AutoIP Automatic LinkLocal IP Configuration
grzemich 0:d7bd7384a37c 4 *
grzemich 0:d7bd7384a37c 5 */
grzemich 0:d7bd7384a37c 6
grzemich 0:d7bd7384a37c 7 /*
grzemich 0:d7bd7384a37c 8 *
grzemich 0:d7bd7384a37c 9 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
grzemich 0:d7bd7384a37c 10 * All rights reserved.
grzemich 0:d7bd7384a37c 11 *
grzemich 0:d7bd7384a37c 12 * Redistribution and use in source and binary forms, with or without modification,
grzemich 0:d7bd7384a37c 13 * are permitted provided that the following conditions are met:
grzemich 0:d7bd7384a37c 14 *
grzemich 0:d7bd7384a37c 15 * 1. Redistributions of source code must retain the above copyright notice,
grzemich 0:d7bd7384a37c 16 * this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
grzemich 0:d7bd7384a37c 18 * this list of conditions and the following disclaimer in the documentation
grzemich 0:d7bd7384a37c 19 * and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 20 * 3. The name of the author may not be used to endorse or promote products
grzemich 0:d7bd7384a37c 21 * derived from this software without specific prior written permission.
grzemich 0:d7bd7384a37c 22 *
grzemich 0:d7bd7384a37c 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
grzemich 0:d7bd7384a37c 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
grzemich 0:d7bd7384a37c 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
grzemich 0:d7bd7384a37c 26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
grzemich 0:d7bd7384a37c 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
grzemich 0:d7bd7384a37c 28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
grzemich 0:d7bd7384a37c 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
grzemich 0:d7bd7384a37c 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
grzemich 0:d7bd7384a37c 31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
grzemich 0:d7bd7384a37c 32 * OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 33 *
grzemich 0:d7bd7384a37c 34 * Author: Dominik Spies <kontakt@dspies.de>
grzemich 0:d7bd7384a37c 35 *
grzemich 0:d7bd7384a37c 36 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
grzemich 0:d7bd7384a37c 37 * with RFC 3927.
grzemich 0:d7bd7384a37c 38 *
grzemich 0:d7bd7384a37c 39 *
grzemich 0:d7bd7384a37c 40 * Please coordinate changes and requests with Dominik Spies
grzemich 0:d7bd7384a37c 41 * <kontakt@dspies.de>
grzemich 0:d7bd7384a37c 42 */
grzemich 0:d7bd7384a37c 43
grzemich 0:d7bd7384a37c 44 /*******************************************************************************
grzemich 0:d7bd7384a37c 45 * USAGE:
grzemich 0:d7bd7384a37c 46 *
grzemich 0:d7bd7384a37c 47 * define LWIP_AUTOIP 1 in your lwipopts.h
grzemich 0:d7bd7384a37c 48 *
grzemich 0:d7bd7384a37c 49 * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
grzemich 0:d7bd7384a37c 50 * - First, call autoip_init().
grzemich 0:d7bd7384a37c 51 * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
grzemich 0:d7bd7384a37c 52 * that should be defined in autoip.h.
grzemich 0:d7bd7384a37c 53 * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
grzemich 0:d7bd7384a37c 54 * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
grzemich 0:d7bd7384a37c 55 *
grzemich 0:d7bd7384a37c 56 * Without DHCP:
grzemich 0:d7bd7384a37c 57 * - Call autoip_start() after netif_add().
grzemich 0:d7bd7384a37c 58 *
grzemich 0:d7bd7384a37c 59 * With DHCP:
grzemich 0:d7bd7384a37c 60 * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
grzemich 0:d7bd7384a37c 61 * - Configure your DHCP Client.
grzemich 0:d7bd7384a37c 62 *
grzemich 0:d7bd7384a37c 63 */
grzemich 0:d7bd7384a37c 64
grzemich 0:d7bd7384a37c 65 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 66
grzemich 0:d7bd7384a37c 67 #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 68
grzemich 0:d7bd7384a37c 69 #include "lwip/mem.h"
grzemich 0:d7bd7384a37c 70 #include "lwip/udp.h"
grzemich 0:d7bd7384a37c 71 #include "lwip/ip_addr.h"
grzemich 0:d7bd7384a37c 72 #include "lwip/netif.h"
grzemich 0:d7bd7384a37c 73 #include "lwip/autoip.h"
grzemich 0:d7bd7384a37c 74 #include "netif/etharp.h"
grzemich 0:d7bd7384a37c 75
grzemich 0:d7bd7384a37c 76 #include <stdlib.h>
grzemich 0:d7bd7384a37c 77 #include <string.h>
grzemich 0:d7bd7384a37c 78
grzemich 0:d7bd7384a37c 79 /* 169.254.0.0 */
grzemich 0:d7bd7384a37c 80 #define AUTOIP_NET 0xA9FE0000
grzemich 0:d7bd7384a37c 81 /* 169.254.1.0 */
grzemich 0:d7bd7384a37c 82 #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
grzemich 0:d7bd7384a37c 83 /* 169.254.254.255 */
grzemich 0:d7bd7384a37c 84 #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
grzemich 0:d7bd7384a37c 85
grzemich 0:d7bd7384a37c 86
grzemich 0:d7bd7384a37c 87 /** Pseudo random macro based on netif informations.
grzemich 0:d7bd7384a37c 88 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
grzemich 0:d7bd7384a37c 89 #ifndef LWIP_AUTOIP_RAND
grzemich 0:d7bd7384a37c 90 #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
grzemich 0:d7bd7384a37c 91 ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
grzemich 0:d7bd7384a37c 92 ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
grzemich 0:d7bd7384a37c 93 ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
grzemich 0:d7bd7384a37c 94 (netif->autoip?netif->autoip->tried_llipaddr:0))
grzemich 0:d7bd7384a37c 95 #endif /* LWIP_AUTOIP_RAND */
grzemich 0:d7bd7384a37c 96
grzemich 0:d7bd7384a37c 97 /**
grzemich 0:d7bd7384a37c 98 * Macro that generates the initial IP address to be tried by AUTOIP.
grzemich 0:d7bd7384a37c 99 * If you want to override this, define it to something else in lwipopts.h.
grzemich 0:d7bd7384a37c 100 */
grzemich 0:d7bd7384a37c 101 #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
grzemich 0:d7bd7384a37c 102 #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
grzemich 0:d7bd7384a37c 103 htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
grzemich 0:d7bd7384a37c 104 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
grzemich 0:d7bd7384a37c 105 #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
grzemich 0:d7bd7384a37c 106
grzemich 0:d7bd7384a37c 107 /* static functions */
grzemich 0:d7bd7384a37c 108 static void autoip_handle_arp_conflict(struct netif *netif);
grzemich 0:d7bd7384a37c 109
grzemich 0:d7bd7384a37c 110 /* creates a pseudo random LL IP-Address for a network interface */
grzemich 0:d7bd7384a37c 111 static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr);
grzemich 0:d7bd7384a37c 112
grzemich 0:d7bd7384a37c 113 /* sends an ARP probe */
grzemich 0:d7bd7384a37c 114 static err_t autoip_arp_probe(struct netif *netif);
grzemich 0:d7bd7384a37c 115
grzemich 0:d7bd7384a37c 116 /* sends an ARP announce */
grzemich 0:d7bd7384a37c 117 static err_t autoip_arp_announce(struct netif *netif);
grzemich 0:d7bd7384a37c 118
grzemich 0:d7bd7384a37c 119 /* configure interface for use with current LL IP-Address */
grzemich 0:d7bd7384a37c 120 static err_t autoip_bind(struct netif *netif);
grzemich 0:d7bd7384a37c 121
grzemich 0:d7bd7384a37c 122 /* start sending probes for llipaddr */
grzemich 0:d7bd7384a37c 123 static void autoip_start_probing(struct netif *netif);
grzemich 0:d7bd7384a37c 124
grzemich 0:d7bd7384a37c 125 /**
grzemich 0:d7bd7384a37c 126 * Initialize this module
grzemich 0:d7bd7384a37c 127 */
grzemich 0:d7bd7384a37c 128 void
grzemich 0:d7bd7384a37c 129 autoip_init(void)
grzemich 0:d7bd7384a37c 130 {
grzemich 0:d7bd7384a37c 131 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_init()\n"));
grzemich 0:d7bd7384a37c 132 }
grzemich 0:d7bd7384a37c 133
grzemich 0:d7bd7384a37c 134 /** Set a statically allocated struct autoip to work with.
grzemich 0:d7bd7384a37c 135 * Using this prevents autoip_start to allocate it using mem_malloc.
grzemich 0:d7bd7384a37c 136 *
grzemich 0:d7bd7384a37c 137 * @param netif the netif for which to set the struct autoip
grzemich 0:d7bd7384a37c 138 * @param dhcp (uninitialised) dhcp struct allocated by the application
grzemich 0:d7bd7384a37c 139 */
grzemich 0:d7bd7384a37c 140 void
grzemich 0:d7bd7384a37c 141 autoip_set_struct(struct netif *netif, struct autoip *autoip)
grzemich 0:d7bd7384a37c 142 {
grzemich 0:d7bd7384a37c 143 LWIP_ASSERT("netif != NULL", netif != NULL);
grzemich 0:d7bd7384a37c 144 LWIP_ASSERT("autoip != NULL", autoip != NULL);
grzemich 0:d7bd7384a37c 145 LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
grzemich 0:d7bd7384a37c 146
grzemich 0:d7bd7384a37c 147 /* clear data structure */
grzemich 0:d7bd7384a37c 148 memset(autoip, 0, sizeof(struct autoip));
grzemich 0:d7bd7384a37c 149 /* autoip->state = AUTOIP_STATE_OFF; */
grzemich 0:d7bd7384a37c 150 netif->autoip = autoip;
grzemich 0:d7bd7384a37c 151 }
grzemich 0:d7bd7384a37c 152
grzemich 0:d7bd7384a37c 153 /** Restart AutoIP client and check the next address (conflict detected)
grzemich 0:d7bd7384a37c 154 *
grzemich 0:d7bd7384a37c 155 * @param netif The netif under AutoIP control
grzemich 0:d7bd7384a37c 156 */
grzemich 0:d7bd7384a37c 157 static void
grzemich 0:d7bd7384a37c 158 autoip_restart(struct netif *netif)
grzemich 0:d7bd7384a37c 159 {
grzemich 0:d7bd7384a37c 160 netif->autoip->tried_llipaddr++;
grzemich 0:d7bd7384a37c 161 autoip_start(netif);
grzemich 0:d7bd7384a37c 162 }
grzemich 0:d7bd7384a37c 163
grzemich 0:d7bd7384a37c 164 /**
grzemich 0:d7bd7384a37c 165 * Handle a IP address conflict after an ARP conflict detection
grzemich 0:d7bd7384a37c 166 */
grzemich 0:d7bd7384a37c 167 static void
grzemich 0:d7bd7384a37c 168 autoip_handle_arp_conflict(struct netif *netif)
grzemich 0:d7bd7384a37c 169 {
grzemich 0:d7bd7384a37c 170 /* Somehow detect if we are defending or retreating */
grzemich 0:d7bd7384a37c 171 unsigned char defend = 1; /* tbd */
grzemich 0:d7bd7384a37c 172
grzemich 0:d7bd7384a37c 173 if(defend) {
grzemich 0:d7bd7384a37c 174 if(netif->autoip->lastconflict > 0) {
grzemich 0:d7bd7384a37c 175 /* retreat, there was a conflicting ARP in the last
grzemich 0:d7bd7384a37c 176 * DEFEND_INTERVAL seconds
grzemich 0:d7bd7384a37c 177 */
grzemich 0:d7bd7384a37c 178 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 179 ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
grzemich 0:d7bd7384a37c 180
grzemich 0:d7bd7384a37c 181 /* TODO: close all TCP sessions */
grzemich 0:d7bd7384a37c 182 autoip_restart(netif);
grzemich 0:d7bd7384a37c 183 } else {
grzemich 0:d7bd7384a37c 184 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 185 ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
grzemich 0:d7bd7384a37c 186 autoip_arp_announce(netif);
grzemich 0:d7bd7384a37c 187 netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
grzemich 0:d7bd7384a37c 188 }
grzemich 0:d7bd7384a37c 189 } else {
grzemich 0:d7bd7384a37c 190 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 191 ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
grzemich 0:d7bd7384a37c 192 /* TODO: close all TCP sessions */
grzemich 0:d7bd7384a37c 193 autoip_restart(netif);
grzemich 0:d7bd7384a37c 194 }
grzemich 0:d7bd7384a37c 195 }
grzemich 0:d7bd7384a37c 196
grzemich 0:d7bd7384a37c 197 /**
grzemich 0:d7bd7384a37c 198 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
grzemich 0:d7bd7384a37c 199 *
grzemich 0:d7bd7384a37c 200 * @param netif network interface on which create the IP-Address
grzemich 0:d7bd7384a37c 201 * @param ipaddr ip address to initialize
grzemich 0:d7bd7384a37c 202 */
grzemich 0:d7bd7384a37c 203 static void
grzemich 0:d7bd7384a37c 204 autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr)
grzemich 0:d7bd7384a37c 205 {
grzemich 0:d7bd7384a37c 206 /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
grzemich 0:d7bd7384a37c 207 * compliant to RFC 3927 Section 2.1
grzemich 0:d7bd7384a37c 208 * We have 254 * 256 possibilities */
grzemich 0:d7bd7384a37c 209
grzemich 0:d7bd7384a37c 210 u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
grzemich 0:d7bd7384a37c 211 addr += netif->autoip->tried_llipaddr;
grzemich 0:d7bd7384a37c 212 addr = AUTOIP_NET | (addr & 0xffff);
grzemich 0:d7bd7384a37c 213 /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
grzemich 0:d7bd7384a37c 214
grzemich 0:d7bd7384a37c 215 if (addr < AUTOIP_RANGE_START) {
grzemich 0:d7bd7384a37c 216 addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
grzemich 0:d7bd7384a37c 217 }
grzemich 0:d7bd7384a37c 218 if (addr > AUTOIP_RANGE_END) {
grzemich 0:d7bd7384a37c 219 addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
grzemich 0:d7bd7384a37c 220 }
grzemich 0:d7bd7384a37c 221 LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
grzemich 0:d7bd7384a37c 222 (addr <= AUTOIP_RANGE_END));
grzemich 0:d7bd7384a37c 223 ip4_addr_set_u32(ipaddr, htonl(addr));
grzemich 0:d7bd7384a37c 224
grzemich 0:d7bd7384a37c 225 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 226 ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 227 (u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
grzemich 0:d7bd7384a37c 228 ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
grzemich 0:d7bd7384a37c 229 }
grzemich 0:d7bd7384a37c 230
grzemich 0:d7bd7384a37c 231 /**
grzemich 0:d7bd7384a37c 232 * Sends an ARP probe from a network interface
grzemich 0:d7bd7384a37c 233 *
grzemich 0:d7bd7384a37c 234 * @param netif network interface used to send the probe
grzemich 0:d7bd7384a37c 235 */
grzemich 0:d7bd7384a37c 236 static err_t
grzemich 0:d7bd7384a37c 237 autoip_arp_probe(struct netif *netif)
grzemich 0:d7bd7384a37c 238 {
grzemich 0:d7bd7384a37c 239 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
grzemich 0:d7bd7384a37c 240 (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, &ethzero,
grzemich 0:d7bd7384a37c 241 &netif->autoip->llipaddr, ARP_REQUEST);
grzemich 0:d7bd7384a37c 242 }
grzemich 0:d7bd7384a37c 243
grzemich 0:d7bd7384a37c 244 /**
grzemich 0:d7bd7384a37c 245 * Sends an ARP announce from a network interface
grzemich 0:d7bd7384a37c 246 *
grzemich 0:d7bd7384a37c 247 * @param netif network interface used to send the announce
grzemich 0:d7bd7384a37c 248 */
grzemich 0:d7bd7384a37c 249 static err_t
grzemich 0:d7bd7384a37c 250 autoip_arp_announce(struct netif *netif)
grzemich 0:d7bd7384a37c 251 {
grzemich 0:d7bd7384a37c 252 return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
grzemich 0:d7bd7384a37c 253 (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
grzemich 0:d7bd7384a37c 254 &netif->autoip->llipaddr, ARP_REQUEST);
grzemich 0:d7bd7384a37c 255 }
grzemich 0:d7bd7384a37c 256
grzemich 0:d7bd7384a37c 257 /**
grzemich 0:d7bd7384a37c 258 * Configure interface for use with current LL IP-Address
grzemich 0:d7bd7384a37c 259 *
grzemich 0:d7bd7384a37c 260 * @param netif network interface to configure with current LL IP-Address
grzemich 0:d7bd7384a37c 261 */
grzemich 0:d7bd7384a37c 262 static err_t
grzemich 0:d7bd7384a37c 263 autoip_bind(struct netif *netif)
grzemich 0:d7bd7384a37c 264 {
grzemich 0:d7bd7384a37c 265 struct autoip *autoip = netif->autoip;
grzemich 0:d7bd7384a37c 266 ip_addr_t sn_mask, gw_addr;
grzemich 0:d7bd7384a37c 267
grzemich 0:d7bd7384a37c 268 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 269 ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 270 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
grzemich 0:d7bd7384a37c 271 ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
grzemich 0:d7bd7384a37c 272 ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
grzemich 0:d7bd7384a37c 273
grzemich 0:d7bd7384a37c 274 IP4_ADDR(&sn_mask, 255, 255, 0, 0);
grzemich 0:d7bd7384a37c 275 IP4_ADDR(&gw_addr, 0, 0, 0, 0);
grzemich 0:d7bd7384a37c 276
grzemich 0:d7bd7384a37c 277 netif_set_ipaddr(netif, &autoip->llipaddr);
grzemich 0:d7bd7384a37c 278 netif_set_netmask(netif, &sn_mask);
grzemich 0:d7bd7384a37c 279 netif_set_gw(netif, &gw_addr);
grzemich 0:d7bd7384a37c 280
grzemich 0:d7bd7384a37c 281 /* bring the interface up */
grzemich 0:d7bd7384a37c 282 netif_set_up(netif);
grzemich 0:d7bd7384a37c 283
grzemich 0:d7bd7384a37c 284 return ERR_OK;
grzemich 0:d7bd7384a37c 285 }
grzemich 0:d7bd7384a37c 286
grzemich 0:d7bd7384a37c 287 /**
grzemich 0:d7bd7384a37c 288 * Start AutoIP client
grzemich 0:d7bd7384a37c 289 *
grzemich 0:d7bd7384a37c 290 * @param netif network interface on which start the AutoIP client
grzemich 0:d7bd7384a37c 291 */
grzemich 0:d7bd7384a37c 292 err_t
grzemich 0:d7bd7384a37c 293 autoip_start(struct netif *netif)
grzemich 0:d7bd7384a37c 294 {
grzemich 0:d7bd7384a37c 295 struct autoip *autoip = netif->autoip;
grzemich 0:d7bd7384a37c 296 err_t result = ERR_OK;
grzemich 0:d7bd7384a37c 297
grzemich 0:d7bd7384a37c 298 if(netif_is_up(netif)) {
grzemich 0:d7bd7384a37c 299 netif_set_down(netif);
grzemich 0:d7bd7384a37c 300 }
grzemich 0:d7bd7384a37c 301
grzemich 0:d7bd7384a37c 302 /* Set IP-Address, Netmask and Gateway to 0 to make sure that
grzemich 0:d7bd7384a37c 303 * ARP Packets are formed correctly
grzemich 0:d7bd7384a37c 304 */
grzemich 0:d7bd7384a37c 305 ip_addr_set_zero(&netif->ip_addr);
grzemich 0:d7bd7384a37c 306 ip_addr_set_zero(&netif->netmask);
grzemich 0:d7bd7384a37c 307 ip_addr_set_zero(&netif->gw);
grzemich 0:d7bd7384a37c 308
grzemich 0:d7bd7384a37c 309 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 310 ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
grzemich 0:d7bd7384a37c 311 netif->name[1], (u16_t)netif->num));
grzemich 0:d7bd7384a37c 312 if(autoip == NULL) {
grzemich 0:d7bd7384a37c 313 /* no AutoIP client attached yet? */
grzemich 0:d7bd7384a37c 314 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 315 ("autoip_start(): starting new AUTOIP client\n"));
grzemich 0:d7bd7384a37c 316 autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
grzemich 0:d7bd7384a37c 317 if(autoip == NULL) {
grzemich 0:d7bd7384a37c 318 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 319 ("autoip_start(): could not allocate autoip\n"));
grzemich 0:d7bd7384a37c 320 return ERR_MEM;
grzemich 0:d7bd7384a37c 321 }
grzemich 0:d7bd7384a37c 322 memset(autoip, 0, sizeof(struct autoip));
grzemich 0:d7bd7384a37c 323 /* store this AutoIP client in the netif */
grzemich 0:d7bd7384a37c 324 netif->autoip = autoip;
grzemich 0:d7bd7384a37c 325 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
grzemich 0:d7bd7384a37c 326 } else {
grzemich 0:d7bd7384a37c 327 autoip->state = AUTOIP_STATE_OFF;
grzemich 0:d7bd7384a37c 328 autoip->ttw = 0;
grzemich 0:d7bd7384a37c 329 autoip->sent_num = 0;
grzemich 0:d7bd7384a37c 330 ip_addr_set_zero(&autoip->llipaddr);
grzemich 0:d7bd7384a37c 331 autoip->lastconflict = 0;
grzemich 0:d7bd7384a37c 332 }
grzemich 0:d7bd7384a37c 333
grzemich 0:d7bd7384a37c 334 autoip_create_addr(netif, &(autoip->llipaddr));
grzemich 0:d7bd7384a37c 335 autoip_start_probing(netif);
grzemich 0:d7bd7384a37c 336
grzemich 0:d7bd7384a37c 337 return result;
grzemich 0:d7bd7384a37c 338 }
grzemich 0:d7bd7384a37c 339
grzemich 0:d7bd7384a37c 340 static void
grzemich 0:d7bd7384a37c 341 autoip_start_probing(struct netif *netif)
grzemich 0:d7bd7384a37c 342 {
grzemich 0:d7bd7384a37c 343 struct autoip *autoip = netif->autoip;
grzemich 0:d7bd7384a37c 344
grzemich 0:d7bd7384a37c 345 autoip->state = AUTOIP_STATE_PROBING;
grzemich 0:d7bd7384a37c 346 autoip->sent_num = 0;
grzemich 0:d7bd7384a37c 347 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 348 ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 349 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
grzemich 0:d7bd7384a37c 350 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
grzemich 0:d7bd7384a37c 351
grzemich 0:d7bd7384a37c 352 /* time to wait to first probe, this is randomly
grzemich 0:d7bd7384a37c 353 * choosen out of 0 to PROBE_WAIT seconds.
grzemich 0:d7bd7384a37c 354 * compliant to RFC 3927 Section 2.2.1
grzemich 0:d7bd7384a37c 355 */
grzemich 0:d7bd7384a37c 356 autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
grzemich 0:d7bd7384a37c 357
grzemich 0:d7bd7384a37c 358 /*
grzemich 0:d7bd7384a37c 359 * if we tried more then MAX_CONFLICTS we must limit our rate for
grzemich 0:d7bd7384a37c 360 * accquiring and probing address
grzemich 0:d7bd7384a37c 361 * compliant to RFC 3927 Section 2.2.1
grzemich 0:d7bd7384a37c 362 */
grzemich 0:d7bd7384a37c 363 if(autoip->tried_llipaddr > MAX_CONFLICTS) {
grzemich 0:d7bd7384a37c 364 autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
grzemich 0:d7bd7384a37c 365 }
grzemich 0:d7bd7384a37c 366 }
grzemich 0:d7bd7384a37c 367
grzemich 0:d7bd7384a37c 368 /**
grzemich 0:d7bd7384a37c 369 * Handle a possible change in the network configuration.
grzemich 0:d7bd7384a37c 370 *
grzemich 0:d7bd7384a37c 371 * If there is an AutoIP address configured, take the interface down
grzemich 0:d7bd7384a37c 372 * and begin probing with the same address.
grzemich 0:d7bd7384a37c 373 */
grzemich 0:d7bd7384a37c 374 void
grzemich 0:d7bd7384a37c 375 autoip_network_changed(struct netif *netif)
grzemich 0:d7bd7384a37c 376 {
grzemich 0:d7bd7384a37c 377 if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
grzemich 0:d7bd7384a37c 378 netif_set_down(netif);
grzemich 0:d7bd7384a37c 379 autoip_start_probing(netif);
grzemich 0:d7bd7384a37c 380 }
grzemich 0:d7bd7384a37c 381 }
grzemich 0:d7bd7384a37c 382
grzemich 0:d7bd7384a37c 383 /**
grzemich 0:d7bd7384a37c 384 * Stop AutoIP client
grzemich 0:d7bd7384a37c 385 *
grzemich 0:d7bd7384a37c 386 * @param netif network interface on which stop the AutoIP client
grzemich 0:d7bd7384a37c 387 */
grzemich 0:d7bd7384a37c 388 err_t
grzemich 0:d7bd7384a37c 389 autoip_stop(struct netif *netif)
grzemich 0:d7bd7384a37c 390 {
grzemich 0:d7bd7384a37c 391 netif->autoip->state = AUTOIP_STATE_OFF;
grzemich 0:d7bd7384a37c 392 netif_set_down(netif);
grzemich 0:d7bd7384a37c 393 return ERR_OK;
grzemich 0:d7bd7384a37c 394 }
grzemich 0:d7bd7384a37c 395
grzemich 0:d7bd7384a37c 396 /**
grzemich 0:d7bd7384a37c 397 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
grzemich 0:d7bd7384a37c 398 */
grzemich 0:d7bd7384a37c 399 void
grzemich 0:d7bd7384a37c 400 autoip_tmr()
grzemich 0:d7bd7384a37c 401 {
grzemich 0:d7bd7384a37c 402 struct netif *netif = netif_list;
grzemich 0:d7bd7384a37c 403 /* loop through netif's */
grzemich 0:d7bd7384a37c 404 while (netif != NULL) {
grzemich 0:d7bd7384a37c 405 /* only act on AutoIP configured interfaces */
grzemich 0:d7bd7384a37c 406 if (netif->autoip != NULL) {
grzemich 0:d7bd7384a37c 407 if(netif->autoip->lastconflict > 0) {
grzemich 0:d7bd7384a37c 408 netif->autoip->lastconflict--;
grzemich 0:d7bd7384a37c 409 }
grzemich 0:d7bd7384a37c 410
grzemich 0:d7bd7384a37c 411 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 412 ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
grzemich 0:d7bd7384a37c 413 (u16_t)(netif->autoip->state), netif->autoip->ttw));
grzemich 0:d7bd7384a37c 414
grzemich 0:d7bd7384a37c 415 switch(netif->autoip->state) {
grzemich 0:d7bd7384a37c 416 case AUTOIP_STATE_PROBING:
grzemich 0:d7bd7384a37c 417 if(netif->autoip->ttw > 0) {
grzemich 0:d7bd7384a37c 418 netif->autoip->ttw--;
grzemich 0:d7bd7384a37c 419 } else {
grzemich 0:d7bd7384a37c 420 if(netif->autoip->sent_num >= PROBE_NUM) {
grzemich 0:d7bd7384a37c 421 netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
grzemich 0:d7bd7384a37c 422 netif->autoip->sent_num = 0;
grzemich 0:d7bd7384a37c 423 netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
grzemich 0:d7bd7384a37c 424 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 425 ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 426 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
grzemich 0:d7bd7384a37c 427 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
grzemich 0:d7bd7384a37c 428 } else {
grzemich 0:d7bd7384a37c 429 autoip_arp_probe(netif);
grzemich 0:d7bd7384a37c 430 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 431 ("autoip_tmr() PROBING Sent Probe\n"));
grzemich 0:d7bd7384a37c 432 netif->autoip->sent_num++;
grzemich 0:d7bd7384a37c 433 /* calculate time to wait to next probe */
grzemich 0:d7bd7384a37c 434 netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
grzemich 0:d7bd7384a37c 435 ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
grzemich 0:d7bd7384a37c 436 PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
grzemich 0:d7bd7384a37c 437 }
grzemich 0:d7bd7384a37c 438 }
grzemich 0:d7bd7384a37c 439 break;
grzemich 0:d7bd7384a37c 440
grzemich 0:d7bd7384a37c 441 case AUTOIP_STATE_ANNOUNCING:
grzemich 0:d7bd7384a37c 442 if(netif->autoip->ttw > 0) {
grzemich 0:d7bd7384a37c 443 netif->autoip->ttw--;
grzemich 0:d7bd7384a37c 444 } else {
grzemich 0:d7bd7384a37c 445 if(netif->autoip->sent_num == 0) {
grzemich 0:d7bd7384a37c 446 /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
grzemich 0:d7bd7384a37c 447 * Now we can bind to an IP address and use it.
grzemich 0:d7bd7384a37c 448 *
grzemich 0:d7bd7384a37c 449 * autoip_bind calls netif_set_up. This triggers a gratuitous ARP
grzemich 0:d7bd7384a37c 450 * which counts as an announcement.
grzemich 0:d7bd7384a37c 451 */
grzemich 0:d7bd7384a37c 452 autoip_bind(netif);
grzemich 0:d7bd7384a37c 453 } else {
grzemich 0:d7bd7384a37c 454 autoip_arp_announce(netif);
grzemich 0:d7bd7384a37c 455 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 456 ("autoip_tmr() ANNOUNCING Sent Announce\n"));
grzemich 0:d7bd7384a37c 457 }
grzemich 0:d7bd7384a37c 458 netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
grzemich 0:d7bd7384a37c 459 netif->autoip->sent_num++;
grzemich 0:d7bd7384a37c 460
grzemich 0:d7bd7384a37c 461 if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
grzemich 0:d7bd7384a37c 462 netif->autoip->state = AUTOIP_STATE_BOUND;
grzemich 0:d7bd7384a37c 463 netif->autoip->sent_num = 0;
grzemich 0:d7bd7384a37c 464 netif->autoip->ttw = 0;
grzemich 0:d7bd7384a37c 465 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 466 ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
grzemich 0:d7bd7384a37c 467 ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
grzemich 0:d7bd7384a37c 468 ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
grzemich 0:d7bd7384a37c 469 }
grzemich 0:d7bd7384a37c 470 }
grzemich 0:d7bd7384a37c 471 break;
grzemich 0:d7bd7384a37c 472 }
grzemich 0:d7bd7384a37c 473 }
grzemich 0:d7bd7384a37c 474 /* proceed to next network interface */
grzemich 0:d7bd7384a37c 475 netif = netif->next;
grzemich 0:d7bd7384a37c 476 }
grzemich 0:d7bd7384a37c 477 }
grzemich 0:d7bd7384a37c 478
grzemich 0:d7bd7384a37c 479 /**
grzemich 0:d7bd7384a37c 480 * Handles every incoming ARP Packet, called by etharp_arp_input.
grzemich 0:d7bd7384a37c 481 *
grzemich 0:d7bd7384a37c 482 * @param netif network interface to use for autoip processing
grzemich 0:d7bd7384a37c 483 * @param hdr Incoming ARP packet
grzemich 0:d7bd7384a37c 484 */
grzemich 0:d7bd7384a37c 485 void
grzemich 0:d7bd7384a37c 486 autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
grzemich 0:d7bd7384a37c 487 {
grzemich 0:d7bd7384a37c 488 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
grzemich 0:d7bd7384a37c 489 if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
grzemich 0:d7bd7384a37c 490 /* when ip.src == llipaddr && hw.src != netif->hwaddr
grzemich 0:d7bd7384a37c 491 *
grzemich 0:d7bd7384a37c 492 * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
grzemich 0:d7bd7384a37c 493 * we have a conflict and must solve it
grzemich 0:d7bd7384a37c 494 */
grzemich 0:d7bd7384a37c 495 ip_addr_t sipaddr, dipaddr;
grzemich 0:d7bd7384a37c 496 struct eth_addr netifaddr;
grzemich 0:d7bd7384a37c 497 ETHADDR16_COPY(netifaddr.addr, netif->hwaddr);
grzemich 0:d7bd7384a37c 498
grzemich 0:d7bd7384a37c 499 /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
grzemich 0:d7bd7384a37c 500 * structure packing (not using structure copy which breaks strict-aliasing rules).
grzemich 0:d7bd7384a37c 501 */
grzemich 0:d7bd7384a37c 502 IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
grzemich 0:d7bd7384a37c 503 IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
grzemich 0:d7bd7384a37c 504
grzemich 0:d7bd7384a37c 505 if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
grzemich 0:d7bd7384a37c 506 ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
grzemich 0:d7bd7384a37c 507 (netif->autoip->sent_num == 0))) {
grzemich 0:d7bd7384a37c 508 /* RFC 3927 Section 2.2.1:
grzemich 0:d7bd7384a37c 509 * from beginning to after ANNOUNCE_WAIT
grzemich 0:d7bd7384a37c 510 * seconds we have a conflict if
grzemich 0:d7bd7384a37c 511 * ip.src == llipaddr OR
grzemich 0:d7bd7384a37c 512 * ip.dst == llipaddr && hw.src != own hwaddr
grzemich 0:d7bd7384a37c 513 */
grzemich 0:d7bd7384a37c 514 if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
grzemich 0:d7bd7384a37c 515 (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
grzemich 0:d7bd7384a37c 516 !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
grzemich 0:d7bd7384a37c 517 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
grzemich 0:d7bd7384a37c 518 ("autoip_arp_reply(): Probe Conflict detected\n"));
grzemich 0:d7bd7384a37c 519 autoip_restart(netif);
grzemich 0:d7bd7384a37c 520 }
grzemich 0:d7bd7384a37c 521 } else {
grzemich 0:d7bd7384a37c 522 /* RFC 3927 Section 2.5:
grzemich 0:d7bd7384a37c 523 * in any state we have a conflict if
grzemich 0:d7bd7384a37c 524 * ip.src == llipaddr && hw.src != own hwaddr
grzemich 0:d7bd7384a37c 525 */
grzemich 0:d7bd7384a37c 526 if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
grzemich 0:d7bd7384a37c 527 !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
grzemich 0:d7bd7384a37c 528 LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
grzemich 0:d7bd7384a37c 529 ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
grzemich 0:d7bd7384a37c 530 autoip_handle_arp_conflict(netif);
grzemich 0:d7bd7384a37c 531 }
grzemich 0:d7bd7384a37c 532 }
grzemich 0:d7bd7384a37c 533 }
grzemich 0:d7bd7384a37c 534 }
grzemich 0:d7bd7384a37c 535
grzemich 0:d7bd7384a37c 536 #endif /* LWIP_AUTOIP */