Donatien Garnier
ZG2100 Network interface source
lwip/core/ipv4/autoip.c@0:b802fc31f1db, 2010-07-09 (annotated)
- Committer:
- donatien
- Date:
- Fri Jul 09 15:37:23 2010 +0000
- Revision:
- 0:b802fc31f1db
- Child:
- 1:3a7c15057192
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| donatien | 0:b802fc31f1db | 1 | /** |
| donatien | 0:b802fc31f1db | 2 | * @file |
| donatien | 0:b802fc31f1db | 3 | * AutoIP Automatic LinkLocal IP Configuration |
| donatien | 0:b802fc31f1db | 4 | * |
| donatien | 0:b802fc31f1db | 5 | */ |
| donatien | 0:b802fc31f1db | 6 | |
| donatien | 0:b802fc31f1db | 7 | /* |
| donatien | 0:b802fc31f1db | 8 | * |
| donatien | 0:b802fc31f1db | 9 | * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de> |
| donatien | 0:b802fc31f1db | 10 | * All rights reserved. |
| donatien | 0:b802fc31f1db | 11 | * |
| donatien | 0:b802fc31f1db | 12 | * Redistribution and use in source and binary forms, with or without modification, |
| donatien | 0:b802fc31f1db | 13 | * are permitted provided that the following conditions are met: |
| donatien | 0:b802fc31f1db | 14 | * |
| donatien | 0:b802fc31f1db | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
| donatien | 0:b802fc31f1db | 16 | * this list of conditions and the following disclaimer. |
| donatien | 0:b802fc31f1db | 17 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| donatien | 0:b802fc31f1db | 18 | * this list of conditions and the following disclaimer in the documentation |
| donatien | 0:b802fc31f1db | 19 | * and/or other materials provided with the distribution. |
| donatien | 0:b802fc31f1db | 20 | * 3. The name of the author may not be used to endorse or promote products |
| donatien | 0:b802fc31f1db | 21 | * derived from this software without specific prior written permission. |
| donatien | 0:b802fc31f1db | 22 | * |
| donatien | 0:b802fc31f1db | 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| donatien | 0:b802fc31f1db | 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| donatien | 0:b802fc31f1db | 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| donatien | 0:b802fc31f1db | 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| donatien | 0:b802fc31f1db | 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| donatien | 0:b802fc31f1db | 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| donatien | 0:b802fc31f1db | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| donatien | 0:b802fc31f1db | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| donatien | 0:b802fc31f1db | 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| donatien | 0:b802fc31f1db | 32 | * OF SUCH DAMAGE. |
| donatien | 0:b802fc31f1db | 33 | * |
| donatien | 0:b802fc31f1db | 34 | * Author: Dominik Spies <kontakt@dspies.de> |
| donatien | 0:b802fc31f1db | 35 | * |
| donatien | 0:b802fc31f1db | 36 | * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform |
| donatien | 0:b802fc31f1db | 37 | * with RFC 3927. |
| donatien | 0:b802fc31f1db | 38 | * |
| donatien | 0:b802fc31f1db | 39 | * |
| donatien | 0:b802fc31f1db | 40 | * Please coordinate changes and requests with Dominik Spies |
| donatien | 0:b802fc31f1db | 41 | * <kontakt@dspies.de> |
| donatien | 0:b802fc31f1db | 42 | */ |
| donatien | 0:b802fc31f1db | 43 | |
| donatien | 0:b802fc31f1db | 44 | /******************************************************************************* |
| donatien | 0:b802fc31f1db | 45 | * USAGE: |
| donatien | 0:b802fc31f1db | 46 | * |
| donatien | 0:b802fc31f1db | 47 | * define LWIP_AUTOIP 1 in your lwipopts.h |
| donatien | 0:b802fc31f1db | 48 | * |
| donatien | 0:b802fc31f1db | 49 | * If you don't use tcpip.c (so, don't call, you don't call tcpip_init): |
| donatien | 0:b802fc31f1db | 50 | * - First, call autoip_init(). |
| donatien | 0:b802fc31f1db | 51 | * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces, |
| donatien | 0:b802fc31f1db | 52 | * that should be defined in autoip.h. |
| donatien | 0:b802fc31f1db | 53 | * I recommend a value of 100. The value must divide 1000 with a remainder almost 0. |
| donatien | 0:b802fc31f1db | 54 | * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 .... |
| donatien | 0:b802fc31f1db | 55 | * |
| donatien | 0:b802fc31f1db | 56 | * Without DHCP: |
| donatien | 0:b802fc31f1db | 57 | * - Call autoip_start() after netif_add(). |
| donatien | 0:b802fc31f1db | 58 | * |
| donatien | 0:b802fc31f1db | 59 | * With DHCP: |
| donatien | 0:b802fc31f1db | 60 | * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h. |
| donatien | 0:b802fc31f1db | 61 | * - Configure your DHCP Client. |
| donatien | 0:b802fc31f1db | 62 | * |
| donatien | 0:b802fc31f1db | 63 | */ |
| donatien | 0:b802fc31f1db | 64 | |
| donatien | 0:b802fc31f1db | 65 | #include "lwip/opt.h" |
| donatien | 0:b802fc31f1db | 66 | |
| donatien | 0:b802fc31f1db | 67 | #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */ |
| donatien | 0:b802fc31f1db | 68 | |
| donatien | 0:b802fc31f1db | 69 | #include "lwip/mem.h" |
| donatien | 0:b802fc31f1db | 70 | #include "lwip/udp.h" |
| donatien | 0:b802fc31f1db | 71 | #include "lwip/ip_addr.h" |
| donatien | 0:b802fc31f1db | 72 | #include "lwip/netif.h" |
| donatien | 0:b802fc31f1db | 73 | #include "lwip/autoip.h" |
| donatien | 0:b802fc31f1db | 74 | #include "netif/etharp.h" |
| donatien | 0:b802fc31f1db | 75 | |
| donatien | 0:b802fc31f1db | 76 | #include <stdlib.h> |
| donatien | 0:b802fc31f1db | 77 | #include <string.h> |
| donatien | 0:b802fc31f1db | 78 | |
| donatien | 0:b802fc31f1db | 79 | /* 169.254.0.0 */ |
| donatien | 0:b802fc31f1db | 80 | #define AUTOIP_NET 0xA9FE0000 |
| donatien | 0:b802fc31f1db | 81 | /* 169.254.1.0 */ |
| donatien | 0:b802fc31f1db | 82 | #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100) |
| donatien | 0:b802fc31f1db | 83 | /* 169.254.254.255 */ |
| donatien | 0:b802fc31f1db | 84 | #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF) |
| donatien | 0:b802fc31f1db | 85 | |
| donatien | 0:b802fc31f1db | 86 | |
| donatien | 0:b802fc31f1db | 87 | /** Pseudo random macro based on netif informations. |
| donatien | 0:b802fc31f1db | 88 | * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */ |
| donatien | 0:b802fc31f1db | 89 | #ifndef LWIP_AUTOIP_RAND |
| donatien | 0:b802fc31f1db | 90 | #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \ |
| donatien | 0:b802fc31f1db | 91 | ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \ |
| donatien | 0:b802fc31f1db | 92 | ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \ |
| donatien | 0:b802fc31f1db | 93 | ((u32_t)((netif->hwaddr[4]) & 0xff))) + \ |
| donatien | 0:b802fc31f1db | 94 | (netif->autoip?netif->autoip->tried_llipaddr:0)) |
| donatien | 0:b802fc31f1db | 95 | #endif /* LWIP_AUTOIP_RAND */ |
| donatien | 0:b802fc31f1db | 96 | |
| donatien | 0:b802fc31f1db | 97 | /** |
| donatien | 0:b802fc31f1db | 98 | * Macro that generates the initial IP address to be tried by AUTOIP. |
| donatien | 0:b802fc31f1db | 99 | * If you want to override this, define it to something else in lwipopts.h. |
| donatien | 0:b802fc31f1db | 100 | */ |
| donatien | 0:b802fc31f1db | 101 | #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR |
| donatien | 0:b802fc31f1db | 102 | #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \ |
| donatien | 0:b802fc31f1db | 103 | htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \ |
| donatien | 0:b802fc31f1db | 104 | ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8))) |
| donatien | 0:b802fc31f1db | 105 | #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */ |
| donatien | 0:b802fc31f1db | 106 | |
| donatien | 0:b802fc31f1db | 107 | /* static functions */ |
| donatien | 0:b802fc31f1db | 108 | static void autoip_handle_arp_conflict(struct netif *netif); |
| donatien | 0:b802fc31f1db | 109 | |
| donatien | 0:b802fc31f1db | 110 | /* creates a pseudo random LL IP-Address for a network interface */ |
| donatien | 0:b802fc31f1db | 111 | static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr); |
| donatien | 0:b802fc31f1db | 112 | |
| donatien | 0:b802fc31f1db | 113 | /* sends an ARP probe */ |
| donatien | 0:b802fc31f1db | 114 | static err_t autoip_arp_probe(struct netif *netif); |
| donatien | 0:b802fc31f1db | 115 | |
| donatien | 0:b802fc31f1db | 116 | /* sends an ARP announce */ |
| donatien | 0:b802fc31f1db | 117 | static err_t autoip_arp_announce(struct netif *netif); |
| donatien | 0:b802fc31f1db | 118 | |
| donatien | 0:b802fc31f1db | 119 | /* configure interface for use with current LL IP-Address */ |
| donatien | 0:b802fc31f1db | 120 | static err_t autoip_bind(struct netif *netif); |
| donatien | 0:b802fc31f1db | 121 | |
| donatien | 0:b802fc31f1db | 122 | /* start sending probes for llipaddr */ |
| donatien | 0:b802fc31f1db | 123 | static void autoip_start_probing(struct netif *netif); |
| donatien | 0:b802fc31f1db | 124 | |
| donatien | 0:b802fc31f1db | 125 | /** |
| donatien | 0:b802fc31f1db | 126 | * Initialize this module |
| donatien | 0:b802fc31f1db | 127 | */ |
| donatien | 0:b802fc31f1db | 128 | void |
| donatien | 0:b802fc31f1db | 129 | autoip_init(void) |
| donatien | 0:b802fc31f1db | 130 | { |
| donatien | 0:b802fc31f1db | 131 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_init()\n")); |
| donatien | 0:b802fc31f1db | 132 | } |
| donatien | 0:b802fc31f1db | 133 | |
| donatien | 0:b802fc31f1db | 134 | /** Set a statically allocated struct autoip to work with. |
| donatien | 0:b802fc31f1db | 135 | * Using this prevents autoip_start to allocate it using mem_malloc. |
| donatien | 0:b802fc31f1db | 136 | * |
| donatien | 0:b802fc31f1db | 137 | * @param netif the netif for which to set the struct autoip |
| donatien | 0:b802fc31f1db | 138 | * @param dhcp (uninitialised) dhcp struct allocated by the application |
| donatien | 0:b802fc31f1db | 139 | */ |
| donatien | 0:b802fc31f1db | 140 | void |
| donatien | 0:b802fc31f1db | 141 | autoip_set_struct(struct netif *netif, struct autoip *autoip) |
| donatien | 0:b802fc31f1db | 142 | { |
| donatien | 0:b802fc31f1db | 143 | LWIP_ASSERT("netif != NULL", netif != NULL); |
| donatien | 0:b802fc31f1db | 144 | LWIP_ASSERT("autoip != NULL", autoip != NULL); |
| donatien | 0:b802fc31f1db | 145 | LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL); |
| donatien | 0:b802fc31f1db | 146 | |
| donatien | 0:b802fc31f1db | 147 | /* clear data structure */ |
| donatien | 0:b802fc31f1db | 148 | memset(autoip, 0, sizeof(struct autoip)); |
| donatien | 0:b802fc31f1db | 149 | /* autoip->state = AUTOIP_STATE_OFF; */ |
| donatien | 0:b802fc31f1db | 150 | netif->autoip = autoip; |
| donatien | 0:b802fc31f1db | 151 | } |
| donatien | 0:b802fc31f1db | 152 | |
| donatien | 0:b802fc31f1db | 153 | /** |
| donatien | 0:b802fc31f1db | 154 | * Handle a IP address conflict after an ARP conflict detection |
| donatien | 0:b802fc31f1db | 155 | */ |
| donatien | 0:b802fc31f1db | 156 | static void |
| donatien | 0:b802fc31f1db | 157 | autoip_handle_arp_conflict(struct netif *netif) |
| donatien | 0:b802fc31f1db | 158 | { |
| donatien | 0:b802fc31f1db | 159 | /* Somehow detect if we are defending or retreating */ |
| donatien | 0:b802fc31f1db | 160 | unsigned char defend = 1; /* tbd */ |
| donatien | 0:b802fc31f1db | 161 | |
| donatien | 0:b802fc31f1db | 162 | if(defend) { |
| donatien | 0:b802fc31f1db | 163 | if(netif->autoip->lastconflict > 0) { |
| donatien | 0:b802fc31f1db | 164 | /* retreat, there was a conflicting ARP in the last |
| donatien | 0:b802fc31f1db | 165 | * DEFEND_INTERVAL seconds |
| donatien | 0:b802fc31f1db | 166 | */ |
| donatien | 0:b802fc31f1db | 167 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 168 | ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n")); |
| donatien | 0:b802fc31f1db | 169 | |
| donatien | 0:b802fc31f1db | 170 | /* TODO: close all TCP sessions */ |
| donatien | 0:b802fc31f1db | 171 | autoip_start(netif); |
| donatien | 0:b802fc31f1db | 172 | } else { |
| donatien | 0:b802fc31f1db | 173 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 174 | ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n")); |
| donatien | 0:b802fc31f1db | 175 | autoip_arp_announce(netif); |
| donatien | 0:b802fc31f1db | 176 | netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
| donatien | 0:b802fc31f1db | 177 | } |
| donatien | 0:b802fc31f1db | 178 | } else { |
| donatien | 0:b802fc31f1db | 179 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 180 | ("autoip_handle_arp_conflict(): we do not defend, retreating\n")); |
| donatien | 0:b802fc31f1db | 181 | /* TODO: close all TCP sessions */ |
| donatien | 0:b802fc31f1db | 182 | autoip_start(netif); |
| donatien | 0:b802fc31f1db | 183 | } |
| donatien | 0:b802fc31f1db | 184 | } |
| donatien | 0:b802fc31f1db | 185 | |
| donatien | 0:b802fc31f1db | 186 | /** |
| donatien | 0:b802fc31f1db | 187 | * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255 |
| donatien | 0:b802fc31f1db | 188 | * |
| donatien | 0:b802fc31f1db | 189 | * @param netif network interface on which create the IP-Address |
| donatien | 0:b802fc31f1db | 190 | * @param ipaddr ip address to initialize |
| donatien | 0:b802fc31f1db | 191 | */ |
| donatien | 0:b802fc31f1db | 192 | static void |
| donatien | 0:b802fc31f1db | 193 | autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr) |
| donatien | 0:b802fc31f1db | 194 | { |
| donatien | 0:b802fc31f1db | 195 | /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255 |
| donatien | 0:b802fc31f1db | 196 | * compliant to RFC 3927 Section 2.1 |
| donatien | 0:b802fc31f1db | 197 | * We have 254 * 256 possibilities */ |
| donatien | 0:b802fc31f1db | 198 | |
| donatien | 0:b802fc31f1db | 199 | u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif)); |
| donatien | 0:b802fc31f1db | 200 | addr += netif->autoip->tried_llipaddr; |
| donatien | 0:b802fc31f1db | 201 | addr = AUTOIP_NET | (addr & 0xffff); |
| donatien | 0:b802fc31f1db | 202 | /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */ |
| donatien | 0:b802fc31f1db | 203 | |
| donatien | 0:b802fc31f1db | 204 | if (addr < AUTOIP_RANGE_START) { |
| donatien | 0:b802fc31f1db | 205 | addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; |
| donatien | 0:b802fc31f1db | 206 | } |
| donatien | 0:b802fc31f1db | 207 | if (addr > AUTOIP_RANGE_END) { |
| donatien | 0:b802fc31f1db | 208 | addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; |
| donatien | 0:b802fc31f1db | 209 | } |
| donatien | 0:b802fc31f1db | 210 | LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) && |
| donatien | 0:b802fc31f1db | 211 | (addr <= AUTOIP_RANGE_END)); |
| donatien | 0:b802fc31f1db | 212 | ip4_addr_set_u32(ipaddr, htonl(addr)); |
| donatien | 0:b802fc31f1db | 213 | |
| donatien | 0:b802fc31f1db | 214 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 215 | ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| donatien | 0:b802fc31f1db | 216 | (u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), |
| donatien | 0:b802fc31f1db | 217 | ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr))); |
| donatien | 0:b802fc31f1db | 218 | } |
| donatien | 0:b802fc31f1db | 219 | |
| donatien | 0:b802fc31f1db | 220 | /** |
| donatien | 0:b802fc31f1db | 221 | * Sends an ARP probe from a network interface |
| donatien | 0:b802fc31f1db | 222 | * |
| donatien | 0:b802fc31f1db | 223 | * @param netif network interface used to send the probe |
| donatien | 0:b802fc31f1db | 224 | */ |
| donatien | 0:b802fc31f1db | 225 | static err_t |
| donatien | 0:b802fc31f1db | 226 | autoip_arp_probe(struct netif *netif) |
| donatien | 0:b802fc31f1db | 227 | { |
| donatien | 0:b802fc31f1db | 228 | return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, |
| donatien | 0:b802fc31f1db | 229 | (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, ðzero, |
| donatien | 0:b802fc31f1db | 230 | &netif->autoip->llipaddr, ARP_REQUEST); |
| donatien | 0:b802fc31f1db | 231 | } |
| donatien | 0:b802fc31f1db | 232 | |
| donatien | 0:b802fc31f1db | 233 | /** |
| donatien | 0:b802fc31f1db | 234 | * Sends an ARP announce from a network interface |
| donatien | 0:b802fc31f1db | 235 | * |
| donatien | 0:b802fc31f1db | 236 | * @param netif network interface used to send the announce |
| donatien | 0:b802fc31f1db | 237 | */ |
| donatien | 0:b802fc31f1db | 238 | static err_t |
| donatien | 0:b802fc31f1db | 239 | autoip_arp_announce(struct netif *netif) |
| donatien | 0:b802fc31f1db | 240 | { |
| donatien | 0:b802fc31f1db | 241 | return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, |
| donatien | 0:b802fc31f1db | 242 | (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero, |
| donatien | 0:b802fc31f1db | 243 | &netif->autoip->llipaddr, ARP_REQUEST); |
| donatien | 0:b802fc31f1db | 244 | } |
| donatien | 0:b802fc31f1db | 245 | |
| donatien | 0:b802fc31f1db | 246 | /** |
| donatien | 0:b802fc31f1db | 247 | * Configure interface for use with current LL IP-Address |
| donatien | 0:b802fc31f1db | 248 | * |
| donatien | 0:b802fc31f1db | 249 | * @param netif network interface to configure with current LL IP-Address |
| donatien | 0:b802fc31f1db | 250 | */ |
| donatien | 0:b802fc31f1db | 251 | static err_t |
| donatien | 0:b802fc31f1db | 252 | autoip_bind(struct netif *netif) |
| donatien | 0:b802fc31f1db | 253 | { |
| donatien | 0:b802fc31f1db | 254 | struct autoip *autoip = netif->autoip; |
| donatien | 0:b802fc31f1db | 255 | ip_addr_t sn_mask, gw_addr; |
| donatien | 0:b802fc31f1db | 256 | |
| donatien | 0:b802fc31f1db | 257 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| donatien | 0:b802fc31f1db | 258 | ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| donatien | 0:b802fc31f1db | 259 | (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, |
| donatien | 0:b802fc31f1db | 260 | ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr), |
| donatien | 0:b802fc31f1db | 261 | ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr))); |
| donatien | 0:b802fc31f1db | 262 | |
| donatien | 0:b802fc31f1db | 263 | IP4_ADDR(&sn_mask, 255, 255, 0, 0); |
| donatien | 0:b802fc31f1db | 264 | IP4_ADDR(&gw_addr, 0, 0, 0, 0); |
| donatien | 0:b802fc31f1db | 265 | |
| donatien | 0:b802fc31f1db | 266 | netif_set_ipaddr(netif, &autoip->llipaddr); |
| donatien | 0:b802fc31f1db | 267 | netif_set_netmask(netif, &sn_mask); |
| donatien | 0:b802fc31f1db | 268 | netif_set_gw(netif, &gw_addr); |
| donatien | 0:b802fc31f1db | 269 | |
| donatien | 0:b802fc31f1db | 270 | /* bring the interface up */ |
| donatien | 0:b802fc31f1db | 271 | netif_set_up(netif); |
| donatien | 0:b802fc31f1db | 272 | |
| donatien | 0:b802fc31f1db | 273 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 274 | } |
| donatien | 0:b802fc31f1db | 275 | |
| donatien | 0:b802fc31f1db | 276 | /** |
| donatien | 0:b802fc31f1db | 277 | * Start AutoIP client |
| donatien | 0:b802fc31f1db | 278 | * |
| donatien | 0:b802fc31f1db | 279 | * @param netif network interface on which start the AutoIP client |
| donatien | 0:b802fc31f1db | 280 | */ |
| donatien | 0:b802fc31f1db | 281 | err_t |
| donatien | 0:b802fc31f1db | 282 | autoip_start(struct netif *netif) |
| donatien | 0:b802fc31f1db | 283 | { |
| donatien | 0:b802fc31f1db | 284 | struct autoip *autoip = netif->autoip; |
| donatien | 0:b802fc31f1db | 285 | err_t result = ERR_OK; |
| donatien | 0:b802fc31f1db | 286 | |
| donatien | 0:b802fc31f1db | 287 | if(netif_is_up(netif)) { |
| donatien | 0:b802fc31f1db | 288 | netif_set_down(netif); |
| donatien | 0:b802fc31f1db | 289 | } |
| donatien | 0:b802fc31f1db | 290 | |
| donatien | 0:b802fc31f1db | 291 | /* Set IP-Address, Netmask and Gateway to 0 to make sure that |
| donatien | 0:b802fc31f1db | 292 | * ARP Packets are formed correctly |
| donatien | 0:b802fc31f1db | 293 | */ |
| donatien | 0:b802fc31f1db | 294 | ip_addr_set_zero(&netif->ip_addr); |
| donatien | 0:b802fc31f1db | 295 | ip_addr_set_zero(&netif->netmask); |
| donatien | 0:b802fc31f1db | 296 | ip_addr_set_zero(&netif->gw); |
| donatien | 0:b802fc31f1db | 297 | |
| donatien | 0:b802fc31f1db | 298 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 299 | ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], |
| donatien | 0:b802fc31f1db | 300 | netif->name[1], (u16_t)netif->num)); |
| donatien | 0:b802fc31f1db | 301 | if(autoip == NULL) { |
| donatien | 0:b802fc31f1db | 302 | /* no AutoIP client attached yet? */ |
| donatien | 0:b802fc31f1db | 303 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| donatien | 0:b802fc31f1db | 304 | ("autoip_start(): starting new AUTOIP client\n")); |
| donatien | 0:b802fc31f1db | 305 | autoip = (struct autoip *)mem_malloc(sizeof(struct autoip)); |
| donatien | 0:b802fc31f1db | 306 | if(autoip == NULL) { |
| donatien | 0:b802fc31f1db | 307 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| donatien | 0:b802fc31f1db | 308 | ("autoip_start(): could not allocate autoip\n")); |
| donatien | 0:b802fc31f1db | 309 | return ERR_MEM; |
| donatien | 0:b802fc31f1db | 310 | } |
| donatien | 0:b802fc31f1db | 311 | memset( autoip, 0, sizeof(struct autoip)); |
| donatien | 0:b802fc31f1db | 312 | /* store this AutoIP client in the netif */ |
| donatien | 0:b802fc31f1db | 313 | netif->autoip = autoip; |
| donatien | 0:b802fc31f1db | 314 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip")); |
| donatien | 0:b802fc31f1db | 315 | } else { |
| donatien | 0:b802fc31f1db | 316 | autoip->state = AUTOIP_STATE_OFF; |
| donatien | 0:b802fc31f1db | 317 | autoip->ttw = 0; |
| donatien | 0:b802fc31f1db | 318 | autoip->sent_num = 0; |
| donatien | 0:b802fc31f1db | 319 | memset(&autoip->llipaddr, 0, sizeof(ip_addr_t)); |
| donatien | 0:b802fc31f1db | 320 | autoip->lastconflict = 0; |
| donatien | 0:b802fc31f1db | 321 | } |
| donatien | 0:b802fc31f1db | 322 | |
| donatien | 0:b802fc31f1db | 323 | autoip_create_addr(netif, &(autoip->llipaddr)); |
| donatien | 0:b802fc31f1db | 324 | autoip->tried_llipaddr++; |
| donatien | 0:b802fc31f1db | 325 | autoip_start_probing(netif); |
| donatien | 0:b802fc31f1db | 326 | |
| donatien | 0:b802fc31f1db | 327 | return result; |
| donatien | 0:b802fc31f1db | 328 | } |
| donatien | 0:b802fc31f1db | 329 | |
| donatien | 0:b802fc31f1db | 330 | static void |
| donatien | 0:b802fc31f1db | 331 | autoip_start_probing(struct netif *netif) |
| donatien | 0:b802fc31f1db | 332 | { |
| donatien | 0:b802fc31f1db | 333 | struct autoip *autoip = netif->autoip; |
| donatien | 0:b802fc31f1db | 334 | |
| donatien | 0:b802fc31f1db | 335 | autoip->state = AUTOIP_STATE_PROBING; |
| donatien | 0:b802fc31f1db | 336 | autoip->sent_num = 0; |
| donatien | 0:b802fc31f1db | 337 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 338 | ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| donatien | 0:b802fc31f1db | 339 | ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), |
| donatien | 0:b802fc31f1db | 340 | ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); |
| donatien | 0:b802fc31f1db | 341 | |
| donatien | 0:b802fc31f1db | 342 | /* time to wait to first probe, this is randomly |
| donatien | 0:b802fc31f1db | 343 | * choosen out of 0 to PROBE_WAIT seconds. |
| donatien | 0:b802fc31f1db | 344 | * compliant to RFC 3927 Section 2.2.1 |
| donatien | 0:b802fc31f1db | 345 | */ |
| donatien | 0:b802fc31f1db | 346 | autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND)); |
| donatien | 0:b802fc31f1db | 347 | |
| donatien | 0:b802fc31f1db | 348 | /* |
| donatien | 0:b802fc31f1db | 349 | * if we tried more then MAX_CONFLICTS we must limit our rate for |
| donatien | 0:b802fc31f1db | 350 | * accquiring and probing address |
| donatien | 0:b802fc31f1db | 351 | * compliant to RFC 3927 Section 2.2.1 |
| donatien | 0:b802fc31f1db | 352 | */ |
| donatien | 0:b802fc31f1db | 353 | if(autoip->tried_llipaddr > MAX_CONFLICTS) { |
| donatien | 0:b802fc31f1db | 354 | autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
| donatien | 0:b802fc31f1db | 355 | } |
| donatien | 0:b802fc31f1db | 356 | } |
| donatien | 0:b802fc31f1db | 357 | |
| donatien | 0:b802fc31f1db | 358 | /** |
| donatien | 0:b802fc31f1db | 359 | * Handle a possible change in the network configuration. |
| donatien | 0:b802fc31f1db | 360 | * |
| donatien | 0:b802fc31f1db | 361 | * If there is an AutoIP address configured, take the interface down |
| donatien | 0:b802fc31f1db | 362 | * and begin probing with the same address. |
| donatien | 0:b802fc31f1db | 363 | */ |
| donatien | 0:b802fc31f1db | 364 | void |
| donatien | 0:b802fc31f1db | 365 | autoip_network_changed(struct netif *netif) |
| donatien | 0:b802fc31f1db | 366 | { |
| donatien | 0:b802fc31f1db | 367 | if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) { |
| donatien | 0:b802fc31f1db | 368 | netif_set_down(netif); |
| donatien | 0:b802fc31f1db | 369 | autoip_start_probing(netif); |
| donatien | 0:b802fc31f1db | 370 | } |
| donatien | 0:b802fc31f1db | 371 | } |
| donatien | 0:b802fc31f1db | 372 | |
| donatien | 0:b802fc31f1db | 373 | /** |
| donatien | 0:b802fc31f1db | 374 | * Stop AutoIP client |
| donatien | 0:b802fc31f1db | 375 | * |
| donatien | 0:b802fc31f1db | 376 | * @param netif network interface on which stop the AutoIP client |
| donatien | 0:b802fc31f1db | 377 | */ |
| donatien | 0:b802fc31f1db | 378 | err_t |
| donatien | 0:b802fc31f1db | 379 | autoip_stop(struct netif *netif) |
| donatien | 0:b802fc31f1db | 380 | { |
| donatien | 0:b802fc31f1db | 381 | netif->autoip->state = AUTOIP_STATE_OFF; |
| donatien | 0:b802fc31f1db | 382 | netif_set_down(netif); |
| donatien | 0:b802fc31f1db | 383 | return ERR_OK; |
| donatien | 0:b802fc31f1db | 384 | } |
| donatien | 0:b802fc31f1db | 385 | |
| donatien | 0:b802fc31f1db | 386 | /** |
| donatien | 0:b802fc31f1db | 387 | * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds |
| donatien | 0:b802fc31f1db | 388 | */ |
| donatien | 0:b802fc31f1db | 389 | void |
| donatien | 0:b802fc31f1db | 390 | autoip_tmr() |
| donatien | 0:b802fc31f1db | 391 | { |
| donatien | 0:b802fc31f1db | 392 | struct netif *netif = netif_list; |
| donatien | 0:b802fc31f1db | 393 | /* loop through netif's */ |
| donatien | 0:b802fc31f1db | 394 | while (netif != NULL) { |
| donatien | 0:b802fc31f1db | 395 | /* only act on AutoIP configured interfaces */ |
| donatien | 0:b802fc31f1db | 396 | if (netif->autoip != NULL) { |
| donatien | 0:b802fc31f1db | 397 | if(netif->autoip->lastconflict > 0) { |
| donatien | 0:b802fc31f1db | 398 | netif->autoip->lastconflict--; |
| donatien | 0:b802fc31f1db | 399 | } |
| donatien | 0:b802fc31f1db | 400 | |
| donatien | 0:b802fc31f1db | 401 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| donatien | 0:b802fc31f1db | 402 | ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", |
| donatien | 0:b802fc31f1db | 403 | (u16_t)(netif->autoip->state), netif->autoip->ttw)); |
| donatien | 0:b802fc31f1db | 404 | |
| donatien | 0:b802fc31f1db | 405 | switch(netif->autoip->state) { |
| donatien | 0:b802fc31f1db | 406 | case AUTOIP_STATE_PROBING: |
| donatien | 0:b802fc31f1db | 407 | if(netif->autoip->ttw > 0) { |
| donatien | 0:b802fc31f1db | 408 | netif->autoip->ttw--; |
| donatien | 0:b802fc31f1db | 409 | } else { |
| donatien | 0:b802fc31f1db | 410 | if(netif->autoip->sent_num >= PROBE_NUM) { |
| donatien | 0:b802fc31f1db | 411 | netif->autoip->state = AUTOIP_STATE_ANNOUNCING; |
| donatien | 0:b802fc31f1db | 412 | netif->autoip->sent_num = 0; |
| donatien | 0:b802fc31f1db | 413 | netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND; |
| donatien | 0:b802fc31f1db | 414 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 415 | ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| donatien | 0:b802fc31f1db | 416 | ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), |
| donatien | 0:b802fc31f1db | 417 | ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); |
| donatien | 0:b802fc31f1db | 418 | } else { |
| donatien | 0:b802fc31f1db | 419 | autoip_arp_probe(netif); |
| donatien | 0:b802fc31f1db | 420 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| donatien | 0:b802fc31f1db | 421 | ("autoip_tmr() PROBING Sent Probe\n")); |
| donatien | 0:b802fc31f1db | 422 | netif->autoip->sent_num++; |
| donatien | 0:b802fc31f1db | 423 | /* calculate time to wait to next probe */ |
| donatien | 0:b802fc31f1db | 424 | netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) % |
| donatien | 0:b802fc31f1db | 425 | ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + |
| donatien | 0:b802fc31f1db | 426 | PROBE_MIN * AUTOIP_TICKS_PER_SECOND); |
| donatien | 0:b802fc31f1db | 427 | } |
| donatien | 0:b802fc31f1db | 428 | } |
| donatien | 0:b802fc31f1db | 429 | break; |
| donatien | 0:b802fc31f1db | 430 | |
| donatien | 0:b802fc31f1db | 431 | case AUTOIP_STATE_ANNOUNCING: |
| donatien | 0:b802fc31f1db | 432 | if(netif->autoip->ttw > 0) { |
| donatien | 0:b802fc31f1db | 433 | netif->autoip->ttw--; |
| donatien | 0:b802fc31f1db | 434 | } else { |
| donatien | 0:b802fc31f1db | 435 | if(netif->autoip->sent_num == 0) { |
| donatien | 0:b802fc31f1db | 436 | /* We are here the first time, so we waited ANNOUNCE_WAIT seconds |
| donatien | 0:b802fc31f1db | 437 | * Now we can bind to an IP address and use it. |
| donatien | 0:b802fc31f1db | 438 | * |
| donatien | 0:b802fc31f1db | 439 | * autoip_bind calls netif_set_up. This triggers a gratuitous ARP |
| donatien | 0:b802fc31f1db | 440 | * which counts as an announcement. |
| donatien | 0:b802fc31f1db | 441 | */ |
| donatien | 0:b802fc31f1db | 442 | autoip_bind(netif); |
| donatien | 0:b802fc31f1db | 443 | } else { |
| donatien | 0:b802fc31f1db | 444 | autoip_arp_announce(netif); |
| donatien | 0:b802fc31f1db | 445 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| donatien | 0:b802fc31f1db | 446 | ("autoip_tmr() ANNOUNCING Sent Announce\n")); |
| donatien | 0:b802fc31f1db | 447 | } |
| donatien | 0:b802fc31f1db | 448 | netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
| donatien | 0:b802fc31f1db | 449 | netif->autoip->sent_num++; |
| donatien | 0:b802fc31f1db | 450 | |
| donatien | 0:b802fc31f1db | 451 | if(netif->autoip->sent_num >= ANNOUNCE_NUM) { |
| donatien | 0:b802fc31f1db | 452 | netif->autoip->state = AUTOIP_STATE_BOUND; |
| donatien | 0:b802fc31f1db | 453 | netif->autoip->sent_num = 0; |
| donatien | 0:b802fc31f1db | 454 | netif->autoip->ttw = 0; |
| donatien | 0:b802fc31f1db | 455 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| donatien | 0:b802fc31f1db | 456 | ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n", |
| donatien | 0:b802fc31f1db | 457 | ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr), |
| donatien | 0:b802fc31f1db | 458 | ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr))); |
| donatien | 0:b802fc31f1db | 459 | } |
| donatien | 0:b802fc31f1db | 460 | } |
| donatien | 0:b802fc31f1db | 461 | break; |
| donatien | 0:b802fc31f1db | 462 | } |
| donatien | 0:b802fc31f1db | 463 | } |
| donatien | 0:b802fc31f1db | 464 | /* proceed to next network interface */ |
| donatien | 0:b802fc31f1db | 465 | netif = netif->next; |
| donatien | 0:b802fc31f1db | 466 | } |
| donatien | 0:b802fc31f1db | 467 | } |
| donatien | 0:b802fc31f1db | 468 | |
| donatien | 0:b802fc31f1db | 469 | /** |
| donatien | 0:b802fc31f1db | 470 | * Handles every incoming ARP Packet, called by etharp_arp_input. |
| donatien | 0:b802fc31f1db | 471 | * |
| donatien | 0:b802fc31f1db | 472 | * @param netif network interface to use for autoip processing |
| donatien | 0:b802fc31f1db | 473 | * @param hdr Incoming ARP packet |
| donatien | 0:b802fc31f1db | 474 | */ |
| donatien | 0:b802fc31f1db | 475 | void |
| donatien | 0:b802fc31f1db | 476 | autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr) |
| donatien | 0:b802fc31f1db | 477 | { |
| donatien | 0:b802fc31f1db | 478 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n")); |
| donatien | 0:b802fc31f1db | 479 | if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) { |
| donatien | 0:b802fc31f1db | 480 | /* when ip.src == llipaddr && hw.src != netif->hwaddr |
| donatien | 0:b802fc31f1db | 481 | * |
| donatien | 0:b802fc31f1db | 482 | * when probing ip.dst == llipaddr && hw.src != netif->hwaddr |
| donatien | 0:b802fc31f1db | 483 | * we have a conflict and must solve it |
| donatien | 0:b802fc31f1db | 484 | */ |
| donatien | 0:b802fc31f1db | 485 | ip_addr_t sipaddr, dipaddr; |
| donatien | 0:b802fc31f1db | 486 | struct eth_addr netifaddr; |
| donatien | 0:b802fc31f1db | 487 | netifaddr.addr[0] = netif->hwaddr[0]; |
| donatien | 0:b802fc31f1db | 488 | netifaddr.addr[1] = netif->hwaddr[1]; |
| donatien | 0:b802fc31f1db | 489 | netifaddr.addr[2] = netif->hwaddr[2]; |
| donatien | 0:b802fc31f1db | 490 | netifaddr.addr[3] = netif->hwaddr[3]; |
| donatien | 0:b802fc31f1db | 491 | netifaddr.addr[4] = netif->hwaddr[4]; |
| donatien | 0:b802fc31f1db | 492 | netifaddr.addr[5] = netif->hwaddr[5]; |
| donatien | 0:b802fc31f1db | 493 | |
| donatien | 0:b802fc31f1db | 494 | /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without |
| donatien | 0:b802fc31f1db | 495 | * structure packing (not using structure copy which breaks strict-aliasing rules). |
| donatien | 0:b802fc31f1db | 496 | */ |
| donatien | 0:b802fc31f1db | 497 | SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr)); |
| donatien | 0:b802fc31f1db | 498 | SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr)); |
| donatien | 0:b802fc31f1db | 499 | |
| donatien | 0:b802fc31f1db | 500 | if ((netif->autoip->state == AUTOIP_STATE_PROBING) || |
| donatien | 0:b802fc31f1db | 501 | ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) && |
| donatien | 0:b802fc31f1db | 502 | (netif->autoip->sent_num == 0))) { |
| donatien | 0:b802fc31f1db | 503 | /* RFC 3927 Section 2.2.1: |
| donatien | 0:b802fc31f1db | 504 | * from beginning to after ANNOUNCE_WAIT |
| donatien | 0:b802fc31f1db | 505 | * seconds we have a conflict if |
| donatien | 0:b802fc31f1db | 506 | * ip.src == llipaddr OR |
| donatien | 0:b802fc31f1db | 507 | * ip.dst == llipaddr && hw.src != own hwaddr |
| donatien | 0:b802fc31f1db | 508 | */ |
| donatien | 0:b802fc31f1db | 509 | if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) || |
| donatien | 0:b802fc31f1db | 510 | (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) && |
| donatien | 0:b802fc31f1db | 511 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) { |
| donatien | 0:b802fc31f1db | 512 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING, |
| donatien | 0:b802fc31f1db | 513 | ("autoip_arp_reply(): Probe Conflict detected\n")); |
| donatien | 0:b802fc31f1db | 514 | autoip_start(netif); |
| donatien | 0:b802fc31f1db | 515 | } |
| donatien | 0:b802fc31f1db | 516 | } else { |
| donatien | 0:b802fc31f1db | 517 | /* RFC 3927 Section 2.5: |
| donatien | 0:b802fc31f1db | 518 | * in any state we have a conflict if |
| donatien | 0:b802fc31f1db | 519 | * ip.src == llipaddr && hw.src != own hwaddr |
| donatien | 0:b802fc31f1db | 520 | */ |
| donatien | 0:b802fc31f1db | 521 | if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) && |
| donatien | 0:b802fc31f1db | 522 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) { |
| donatien | 0:b802fc31f1db | 523 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING, |
| donatien | 0:b802fc31f1db | 524 | ("autoip_arp_reply(): Conflicting ARP-Packet detected\n")); |
| donatien | 0:b802fc31f1db | 525 | autoip_handle_arp_conflict(netif); |
| donatien | 0:b802fc31f1db | 526 | } |
| donatien | 0:b802fc31f1db | 527 | } |
| donatien | 0:b802fc31f1db | 528 | } |
| donatien | 0:b802fc31f1db | 529 | } |
| donatien | 0:b802fc31f1db | 530 | |
| donatien | 0:b802fc31f1db | 531 | #endif /* LWIP_AUTOIP */ |