My fork of the HTTPServer (working)
Core/lwIP/core/ipv4/autoip.c@1:284f2df30cf9, 2012-11-20 (annotated)
- Committer:
- screamer
- Date:
- Tue Nov 20 12:18:53 2012 +0000
- Revision:
- 1:284f2df30cf9
- Parent:
- 0:7a64fbb4069d
local changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
screamer | 0:7a64fbb4069d | 1 | /** |
screamer | 0:7a64fbb4069d | 2 | * @file |
screamer | 0:7a64fbb4069d | 3 | * AutoIP Automatic LinkLocal IP Configuration |
screamer | 0:7a64fbb4069d | 4 | * |
screamer | 0:7a64fbb4069d | 5 | */ |
screamer | 0:7a64fbb4069d | 6 | |
screamer | 0:7a64fbb4069d | 7 | /* |
screamer | 0:7a64fbb4069d | 8 | * |
screamer | 0:7a64fbb4069d | 9 | * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de> |
screamer | 0:7a64fbb4069d | 10 | * All rights reserved. |
screamer | 0:7a64fbb4069d | 11 | * |
screamer | 0:7a64fbb4069d | 12 | * Redistribution and use in source and binary forms, with or without modification, |
screamer | 0:7a64fbb4069d | 13 | * are permitted provided that the following conditions are met: |
screamer | 0:7a64fbb4069d | 14 | * |
screamer | 0:7a64fbb4069d | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
screamer | 0:7a64fbb4069d | 16 | * this list of conditions and the following disclaimer. |
screamer | 0:7a64fbb4069d | 17 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
screamer | 0:7a64fbb4069d | 18 | * this list of conditions and the following disclaimer in the documentation |
screamer | 0:7a64fbb4069d | 19 | * and/or other materials provided with the distribution. |
screamer | 0:7a64fbb4069d | 20 | * 3. The name of the author may not be used to endorse or promote products |
screamer | 0:7a64fbb4069d | 21 | * derived from this software without specific prior written permission. |
screamer | 0:7a64fbb4069d | 22 | * |
screamer | 0:7a64fbb4069d | 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
screamer | 0:7a64fbb4069d | 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
screamer | 0:7a64fbb4069d | 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
screamer | 0:7a64fbb4069d | 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
screamer | 0:7a64fbb4069d | 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
screamer | 0:7a64fbb4069d | 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
screamer | 0:7a64fbb4069d | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
screamer | 0:7a64fbb4069d | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
screamer | 0:7a64fbb4069d | 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
screamer | 0:7a64fbb4069d | 32 | * OF SUCH DAMAGE. |
screamer | 0:7a64fbb4069d | 33 | * |
screamer | 0:7a64fbb4069d | 34 | * Author: Dominik Spies <kontakt@dspies.de> |
screamer | 0:7a64fbb4069d | 35 | * |
screamer | 0:7a64fbb4069d | 36 | * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform |
screamer | 0:7a64fbb4069d | 37 | * with RFC 3927. |
screamer | 0:7a64fbb4069d | 38 | * |
screamer | 0:7a64fbb4069d | 39 | * |
screamer | 0:7a64fbb4069d | 40 | * Please coordinate changes and requests with Dominik Spies |
screamer | 0:7a64fbb4069d | 41 | * <kontakt@dspies.de> |
screamer | 0:7a64fbb4069d | 42 | */ |
screamer | 0:7a64fbb4069d | 43 | |
screamer | 0:7a64fbb4069d | 44 | /******************************************************************************* |
screamer | 0:7a64fbb4069d | 45 | * USAGE: |
screamer | 0:7a64fbb4069d | 46 | * |
screamer | 0:7a64fbb4069d | 47 | * define LWIP_AUTOIP 1 in your lwipopts.h |
screamer | 0:7a64fbb4069d | 48 | * |
screamer | 0:7a64fbb4069d | 49 | * If you don't use tcpip.c (so, don't call, you don't call tcpip_init): |
screamer | 0:7a64fbb4069d | 50 | * - First, call autoip_init(). |
screamer | 0:7a64fbb4069d | 51 | * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces, |
screamer | 0:7a64fbb4069d | 52 | * that should be defined in autoip.h. |
screamer | 0:7a64fbb4069d | 53 | * I recommend a value of 100. The value must divide 1000 with a remainder almost 0. |
screamer | 0:7a64fbb4069d | 54 | * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 .... |
screamer | 0:7a64fbb4069d | 55 | * |
screamer | 0:7a64fbb4069d | 56 | * Without DHCP: |
screamer | 0:7a64fbb4069d | 57 | * - Call autoip_start() after netif_add(). |
screamer | 0:7a64fbb4069d | 58 | * |
screamer | 0:7a64fbb4069d | 59 | * With DHCP: |
screamer | 0:7a64fbb4069d | 60 | * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h. |
screamer | 0:7a64fbb4069d | 61 | * - Configure your DHCP Client. |
screamer | 0:7a64fbb4069d | 62 | * |
screamer | 0:7a64fbb4069d | 63 | */ |
screamer | 0:7a64fbb4069d | 64 | |
screamer | 0:7a64fbb4069d | 65 | #include "lwip/opt.h" |
screamer | 0:7a64fbb4069d | 66 | |
screamer | 0:7a64fbb4069d | 67 | #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */ |
screamer | 0:7a64fbb4069d | 68 | |
screamer | 0:7a64fbb4069d | 69 | #include "lwip/mem.h" |
screamer | 0:7a64fbb4069d | 70 | #include "lwip/udp.h" |
screamer | 0:7a64fbb4069d | 71 | #include "lwip/ip_addr.h" |
screamer | 0:7a64fbb4069d | 72 | #include "lwip/netif.h" |
screamer | 0:7a64fbb4069d | 73 | #include "lwip/autoip.h" |
screamer | 0:7a64fbb4069d | 74 | #include "netif/etharp.h" |
screamer | 0:7a64fbb4069d | 75 | |
screamer | 0:7a64fbb4069d | 76 | #include <stdlib.h> |
screamer | 0:7a64fbb4069d | 77 | #include <string.h> |
screamer | 0:7a64fbb4069d | 78 | |
screamer | 0:7a64fbb4069d | 79 | /* 169.254.0.0 */ |
screamer | 0:7a64fbb4069d | 80 | #define AUTOIP_NET 0xA9FE0000 |
screamer | 0:7a64fbb4069d | 81 | /* 169.254.1.0 */ |
screamer | 0:7a64fbb4069d | 82 | #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100) |
screamer | 0:7a64fbb4069d | 83 | /* 169.254.254.255 */ |
screamer | 0:7a64fbb4069d | 84 | #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF) |
screamer | 0:7a64fbb4069d | 85 | |
screamer | 0:7a64fbb4069d | 86 | |
screamer | 0:7a64fbb4069d | 87 | /** Pseudo random macro based on netif informations. |
screamer | 0:7a64fbb4069d | 88 | * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */ |
screamer | 0:7a64fbb4069d | 89 | #ifndef LWIP_AUTOIP_RAND |
screamer | 0:7a64fbb4069d | 90 | #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \ |
screamer | 0:7a64fbb4069d | 91 | ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \ |
screamer | 0:7a64fbb4069d | 92 | ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \ |
screamer | 0:7a64fbb4069d | 93 | ((u32_t)((netif->hwaddr[4]) & 0xff))) + \ |
screamer | 0:7a64fbb4069d | 94 | (netif->autoip?netif->autoip->tried_llipaddr:0)) |
screamer | 0:7a64fbb4069d | 95 | #endif /* LWIP_AUTOIP_RAND */ |
screamer | 0:7a64fbb4069d | 96 | |
screamer | 0:7a64fbb4069d | 97 | /** |
screamer | 0:7a64fbb4069d | 98 | * Macro that generates the initial IP address to be tried by AUTOIP. |
screamer | 0:7a64fbb4069d | 99 | * If you want to override this, define it to something else in lwipopts.h. |
screamer | 0:7a64fbb4069d | 100 | */ |
screamer | 0:7a64fbb4069d | 101 | #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR |
screamer | 0:7a64fbb4069d | 102 | #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \ |
screamer | 0:7a64fbb4069d | 103 | (AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \ |
screamer | 0:7a64fbb4069d | 104 | ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8))) |
screamer | 0:7a64fbb4069d | 105 | #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */ |
screamer | 0:7a64fbb4069d | 106 | |
screamer | 0:7a64fbb4069d | 107 | /* static functions */ |
screamer | 0:7a64fbb4069d | 108 | static void autoip_handle_arp_conflict(struct netif *netif); |
screamer | 0:7a64fbb4069d | 109 | |
screamer | 0:7a64fbb4069d | 110 | /* creates a pseudo random LL IP-Address for a network interface */ |
screamer | 0:7a64fbb4069d | 111 | static void autoip_create_addr(struct netif *netif, struct ip_addr *IPAddr); |
screamer | 0:7a64fbb4069d | 112 | |
screamer | 0:7a64fbb4069d | 113 | /* sends an ARP announce */ |
screamer | 0:7a64fbb4069d | 114 | static err_t autoip_arp_announce(struct netif *netif); |
screamer | 0:7a64fbb4069d | 115 | |
screamer | 0:7a64fbb4069d | 116 | /* configure interface for use with current LL IP-Address */ |
screamer | 0:7a64fbb4069d | 117 | static err_t autoip_bind(struct netif *netif); |
screamer | 0:7a64fbb4069d | 118 | |
screamer | 0:7a64fbb4069d | 119 | /** |
screamer | 0:7a64fbb4069d | 120 | * Initialize this module |
screamer | 0:7a64fbb4069d | 121 | */ |
screamer | 0:7a64fbb4069d | 122 | void |
screamer | 0:7a64fbb4069d | 123 | autoip_init(void) |
screamer | 0:7a64fbb4069d | 124 | { |
screamer | 0:7a64fbb4069d | 125 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n")); |
screamer | 0:7a64fbb4069d | 126 | } |
screamer | 0:7a64fbb4069d | 127 | |
screamer | 0:7a64fbb4069d | 128 | /** |
screamer | 0:7a64fbb4069d | 129 | * Handle a IP address conflict after an ARP conflict detection |
screamer | 0:7a64fbb4069d | 130 | */ |
screamer | 0:7a64fbb4069d | 131 | static void |
screamer | 0:7a64fbb4069d | 132 | autoip_handle_arp_conflict(struct netif *netif) |
screamer | 0:7a64fbb4069d | 133 | { |
screamer | 0:7a64fbb4069d | 134 | /* Somehow detect if we are defending or retreating */ |
screamer | 0:7a64fbb4069d | 135 | unsigned char defend = 1; /* tbd */ |
screamer | 0:7a64fbb4069d | 136 | |
screamer | 0:7a64fbb4069d | 137 | if(defend) { |
screamer | 0:7a64fbb4069d | 138 | if(netif->autoip->lastconflict > 0) { |
screamer | 0:7a64fbb4069d | 139 | /* retreat, there was a conflicting ARP in the last |
screamer | 0:7a64fbb4069d | 140 | * DEFEND_INTERVAL seconds |
screamer | 0:7a64fbb4069d | 141 | */ |
screamer | 0:7a64fbb4069d | 142 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
screamer | 0:7a64fbb4069d | 143 | ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n")); |
screamer | 0:7a64fbb4069d | 144 | |
screamer | 0:7a64fbb4069d | 145 | /* TODO: close all TCP sessions */ |
screamer | 0:7a64fbb4069d | 146 | autoip_start(netif); |
screamer | 0:7a64fbb4069d | 147 | } else { |
screamer | 0:7a64fbb4069d | 148 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
screamer | 0:7a64fbb4069d | 149 | ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n")); |
screamer | 0:7a64fbb4069d | 150 | autoip_arp_announce(netif); |
screamer | 0:7a64fbb4069d | 151 | netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
screamer | 0:7a64fbb4069d | 152 | } |
screamer | 0:7a64fbb4069d | 153 | } else { |
screamer | 0:7a64fbb4069d | 154 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
screamer | 0:7a64fbb4069d | 155 | ("autoip_handle_arp_conflict(): we do not defend, retreating\n")); |
screamer | 0:7a64fbb4069d | 156 | /* TODO: close all TCP sessions */ |
screamer | 0:7a64fbb4069d | 157 | autoip_start(netif); |
screamer | 0:7a64fbb4069d | 158 | } |
screamer | 0:7a64fbb4069d | 159 | } |
screamer | 0:7a64fbb4069d | 160 | |
screamer | 0:7a64fbb4069d | 161 | /** |
screamer | 0:7a64fbb4069d | 162 | * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255 |
screamer | 0:7a64fbb4069d | 163 | * |
screamer | 0:7a64fbb4069d | 164 | * @param netif network interface on which create the IP-Address |
screamer | 0:7a64fbb4069d | 165 | * @param IPAddr ip address to initialize |
screamer | 0:7a64fbb4069d | 166 | */ |
screamer | 0:7a64fbb4069d | 167 | static void |
screamer | 0:7a64fbb4069d | 168 | autoip_create_addr(struct netif *netif, struct ip_addr *IPAddr) |
screamer | 0:7a64fbb4069d | 169 | { |
screamer | 0:7a64fbb4069d | 170 | /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255 |
screamer | 0:7a64fbb4069d | 171 | * compliant to RFC 3927 Section 2.1 |
screamer | 0:7a64fbb4069d | 172 | * We have 254 * 256 possibilities */ |
screamer | 0:7a64fbb4069d | 173 | |
screamer | 0:7a64fbb4069d | 174 | u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif)); |
screamer | 0:7a64fbb4069d | 175 | addr += netif->autoip->tried_llipaddr; |
screamer | 0:7a64fbb4069d | 176 | addr = AUTOIP_NET | (addr & 0xffff); |
screamer | 0:7a64fbb4069d | 177 | /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */ |
screamer | 0:7a64fbb4069d | 178 | |
screamer | 0:7a64fbb4069d | 179 | if (addr < AUTOIP_RANGE_START) { |
screamer | 0:7a64fbb4069d | 180 | addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; |
screamer | 0:7a64fbb4069d | 181 | } |
screamer | 0:7a64fbb4069d | 182 | if (addr > AUTOIP_RANGE_END) { |
screamer | 0:7a64fbb4069d | 183 | addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; |
screamer | 0:7a64fbb4069d | 184 | } |
screamer | 0:7a64fbb4069d | 185 | LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) && |
screamer | 0:7a64fbb4069d | 186 | (addr <= AUTOIP_RANGE_END)); |
screamer | 0:7a64fbb4069d | 187 | IPAddr->addr = htonl(addr); |
screamer | 0:7a64fbb4069d | 188 | |
screamer | 0:7a64fbb4069d | 189 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
screamer | 0:7a64fbb4069d | 190 | ("autoip_create_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n", |
screamer | 0:7a64fbb4069d | 191 | (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(IPAddr->addr))); |
screamer | 0:7a64fbb4069d | 192 | } |
screamer | 0:7a64fbb4069d | 193 | |
screamer | 0:7a64fbb4069d | 194 | /** |
screamer | 0:7a64fbb4069d | 195 | * Sends an ARP announce from a network interface |
screamer | 0:7a64fbb4069d | 196 | * |
screamer | 0:7a64fbb4069d | 197 | * @param netif network interface used to send the announce |
screamer | 0:7a64fbb4069d | 198 | */ |
screamer | 0:7a64fbb4069d | 199 | static err_t |
screamer | 0:7a64fbb4069d | 200 | autoip_arp_announce(struct netif *netif) |
screamer | 0:7a64fbb4069d | 201 | { |
screamer | 0:7a64fbb4069d | 202 | return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, |
screamer | 0:7a64fbb4069d | 203 | (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero, |
screamer | 0:7a64fbb4069d | 204 | &netif->autoip->llipaddr, ARP_REQUEST); |
screamer | 0:7a64fbb4069d | 205 | } |
screamer | 0:7a64fbb4069d | 206 | |
screamer | 0:7a64fbb4069d | 207 | /** |
screamer | 0:7a64fbb4069d | 208 | * Configure interface for use with current LL IP-Address |
screamer | 0:7a64fbb4069d | 209 | * |
screamer | 0:7a64fbb4069d | 210 | * @param netif network interface to configure with current LL IP-Address |
screamer | 0:7a64fbb4069d | 211 | */ |
screamer | 0:7a64fbb4069d | 212 | static err_t |
screamer | 0:7a64fbb4069d | 213 | autoip_bind(struct netif *netif) |
screamer | 0:7a64fbb4069d | 214 | { |
screamer | 0:7a64fbb4069d | 215 | struct autoip *autoip = netif->autoip; |
screamer | 0:7a64fbb4069d | 216 | struct ip_addr sn_mask, gw_addr; |
screamer | 0:7a64fbb4069d | 217 | |
screamer | 0:7a64fbb4069d | 218 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, |
screamer | 0:7a64fbb4069d | 219 | ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n", |
screamer | 0:7a64fbb4069d | 220 | (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr)); |
screamer | 0:7a64fbb4069d | 221 | |
screamer | 0:7a64fbb4069d | 222 | IP4_ADDR(&sn_mask, 255, 255, 0, 0); |
screamer | 0:7a64fbb4069d | 223 | IP4_ADDR(&gw_addr, 0, 0, 0, 0); |
screamer | 0:7a64fbb4069d | 224 | |
screamer | 0:7a64fbb4069d | 225 | netif_set_ipaddr(netif, &autoip->llipaddr); |
screamer | 0:7a64fbb4069d | 226 | netif_set_netmask(netif, &sn_mask); |
screamer | 0:7a64fbb4069d | 227 | netif_set_gw(netif, &gw_addr); |
screamer | 0:7a64fbb4069d | 228 | |
screamer | 0:7a64fbb4069d | 229 | /* bring the interface up */ |
screamer | 0:7a64fbb4069d | 230 | netif_set_up(netif); |
screamer | 0:7a64fbb4069d | 231 | |
screamer | 0:7a64fbb4069d | 232 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 233 | } |
screamer | 0:7a64fbb4069d | 234 | |
screamer | 0:7a64fbb4069d | 235 | /** |
screamer | 0:7a64fbb4069d | 236 | * Start AutoIP client |
screamer | 0:7a64fbb4069d | 237 | * |
screamer | 0:7a64fbb4069d | 238 | * @param netif network interface on which start the AutoIP client |
screamer | 0:7a64fbb4069d | 239 | */ |
screamer | 0:7a64fbb4069d | 240 | err_t |
screamer | 0:7a64fbb4069d | 241 | autoip_start(struct netif *netif) |
screamer | 0:7a64fbb4069d | 242 | { |
screamer | 0:7a64fbb4069d | 243 | struct autoip *autoip = netif->autoip; |
screamer | 0:7a64fbb4069d | 244 | err_t result = ERR_OK; |
screamer | 0:7a64fbb4069d | 245 | |
screamer | 0:7a64fbb4069d | 246 | if(netif_is_up(netif)) { |
screamer | 0:7a64fbb4069d | 247 | netif_set_down(netif); |
screamer | 0:7a64fbb4069d | 248 | } |
screamer | 0:7a64fbb4069d | 249 | |
screamer | 0:7a64fbb4069d | 250 | /* Set IP-Address, Netmask and Gateway to 0 to make sure that |
screamer | 0:7a64fbb4069d | 251 | * ARP Packets are formed correctly |
screamer | 0:7a64fbb4069d | 252 | */ |
screamer | 0:7a64fbb4069d | 253 | netif->ip_addr.addr = 0; |
screamer | 0:7a64fbb4069d | 254 | netif->netmask.addr = 0; |
screamer | 0:7a64fbb4069d | 255 | netif->gw.addr = 0; |
screamer | 0:7a64fbb4069d | 256 | |
screamer | 0:7a64fbb4069d | 257 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
screamer | 0:7a64fbb4069d | 258 | ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], |
screamer | 0:7a64fbb4069d | 259 | netif->name[1], (u16_t)netif->num)); |
screamer | 0:7a64fbb4069d | 260 | if(autoip == NULL) { |
screamer | 0:7a64fbb4069d | 261 | /* no AutoIP client attached yet? */ |
screamer | 0:7a64fbb4069d | 262 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
screamer | 0:7a64fbb4069d | 263 | ("autoip_start(): starting new AUTOIP client\n")); |
screamer | 0:7a64fbb4069d | 264 | autoip = (struct autoip *)mem_malloc(sizeof(struct autoip)); // static_cast<struct autoip *>(x) |
screamer | 0:7a64fbb4069d | 265 | if(autoip == NULL) { |
screamer | 0:7a64fbb4069d | 266 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
screamer | 0:7a64fbb4069d | 267 | ("autoip_start(): could not allocate autoip\n")); |
screamer | 0:7a64fbb4069d | 268 | return ERR_MEM; |
screamer | 0:7a64fbb4069d | 269 | } |
screamer | 0:7a64fbb4069d | 270 | memset( autoip, 0, sizeof(struct autoip)); |
screamer | 0:7a64fbb4069d | 271 | /* store this AutoIP client in the netif */ |
screamer | 0:7a64fbb4069d | 272 | netif->autoip = autoip; |
screamer | 0:7a64fbb4069d | 273 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip")); |
screamer | 0:7a64fbb4069d | 274 | } else { |
screamer | 0:7a64fbb4069d | 275 | autoip->state = AUTOIP_STATE_OFF; |
screamer | 0:7a64fbb4069d | 276 | autoip->ttw = 0; |
screamer | 0:7a64fbb4069d | 277 | autoip->sent_num = 0; |
screamer | 0:7a64fbb4069d | 278 | memset(&autoip->llipaddr, 0, sizeof(struct ip_addr)); |
screamer | 0:7a64fbb4069d | 279 | autoip->lastconflict = 0; |
screamer | 0:7a64fbb4069d | 280 | } |
screamer | 0:7a64fbb4069d | 281 | |
screamer | 0:7a64fbb4069d | 282 | autoip_create_addr(netif, &(autoip->llipaddr)); |
screamer | 0:7a64fbb4069d | 283 | autoip->tried_llipaddr++; |
screamer | 0:7a64fbb4069d | 284 | autoip->state = AUTOIP_STATE_PROBING; |
screamer | 0:7a64fbb4069d | 285 | autoip->sent_num = 0; |
screamer | 0:7a64fbb4069d | 286 | |
screamer | 0:7a64fbb4069d | 287 | /* time to wait to first probe, this is randomly |
screamer | 0:7a64fbb4069d | 288 | * choosen out of 0 to PROBE_WAIT seconds. |
screamer | 0:7a64fbb4069d | 289 | * compliant to RFC 3927 Section 2.2.1 |
screamer | 0:7a64fbb4069d | 290 | */ |
screamer | 0:7a64fbb4069d | 291 | autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND)); |
screamer | 0:7a64fbb4069d | 292 | |
screamer | 0:7a64fbb4069d | 293 | /* |
screamer | 0:7a64fbb4069d | 294 | * if we tried more then MAX_CONFLICTS we must limit our rate for |
screamer | 0:7a64fbb4069d | 295 | * accquiring and probing address |
screamer | 0:7a64fbb4069d | 296 | * compliant to RFC 3927 Section 2.2.1 |
screamer | 0:7a64fbb4069d | 297 | */ |
screamer | 0:7a64fbb4069d | 298 | |
screamer | 0:7a64fbb4069d | 299 | if(autoip->tried_llipaddr > MAX_CONFLICTS) { |
screamer | 0:7a64fbb4069d | 300 | autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
screamer | 0:7a64fbb4069d | 301 | } |
screamer | 0:7a64fbb4069d | 302 | |
screamer | 0:7a64fbb4069d | 303 | return result; |
screamer | 0:7a64fbb4069d | 304 | } |
screamer | 0:7a64fbb4069d | 305 | |
screamer | 0:7a64fbb4069d | 306 | /** |
screamer | 0:7a64fbb4069d | 307 | * Stop AutoIP client |
screamer | 0:7a64fbb4069d | 308 | * |
screamer | 0:7a64fbb4069d | 309 | * @param netif network interface on which stop the AutoIP client |
screamer | 0:7a64fbb4069d | 310 | */ |
screamer | 0:7a64fbb4069d | 311 | err_t |
screamer | 0:7a64fbb4069d | 312 | autoip_stop(struct netif *netif) |
screamer | 0:7a64fbb4069d | 313 | { |
screamer | 0:7a64fbb4069d | 314 | netif->autoip->state = AUTOIP_STATE_OFF; |
screamer | 0:7a64fbb4069d | 315 | netif_set_down(netif); |
screamer | 0:7a64fbb4069d | 316 | return ERR_OK; |
screamer | 0:7a64fbb4069d | 317 | } |
screamer | 0:7a64fbb4069d | 318 | |
screamer | 0:7a64fbb4069d | 319 | /** |
screamer | 0:7a64fbb4069d | 320 | * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds |
screamer | 0:7a64fbb4069d | 321 | */ |
screamer | 0:7a64fbb4069d | 322 | void |
screamer | 0:7a64fbb4069d | 323 | autoip_tmr() |
screamer | 0:7a64fbb4069d | 324 | { |
screamer | 0:7a64fbb4069d | 325 | struct netif *netif = netif_list; |
screamer | 0:7a64fbb4069d | 326 | /* loop through netif's */ |
screamer | 0:7a64fbb4069d | 327 | while (netif != NULL) { |
screamer | 0:7a64fbb4069d | 328 | /* only act on AutoIP configured interfaces */ |
screamer | 0:7a64fbb4069d | 329 | if (netif->autoip != NULL) { |
screamer | 0:7a64fbb4069d | 330 | if(netif->autoip->lastconflict > 0) { |
screamer | 0:7a64fbb4069d | 331 | netif->autoip->lastconflict--; |
screamer | 0:7a64fbb4069d | 332 | } |
screamer | 0:7a64fbb4069d | 333 | |
screamer | 0:7a64fbb4069d | 334 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
screamer | 0:7a64fbb4069d | 335 | ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", |
screamer | 0:7a64fbb4069d | 336 | (u16_t)(netif->autoip->state), netif->autoip->ttw)); |
screamer | 0:7a64fbb4069d | 337 | |
screamer | 0:7a64fbb4069d | 338 | switch(netif->autoip->state) { |
screamer | 0:7a64fbb4069d | 339 | case AUTOIP_STATE_PROBING: |
screamer | 0:7a64fbb4069d | 340 | if(netif->autoip->ttw > 0) { |
screamer | 0:7a64fbb4069d | 341 | netif->autoip->ttw--; |
screamer | 0:7a64fbb4069d | 342 | } else { |
screamer | 0:7a64fbb4069d | 343 | if(netif->autoip->sent_num == PROBE_NUM) { |
screamer | 0:7a64fbb4069d | 344 | netif->autoip->state = AUTOIP_STATE_ANNOUNCING; |
screamer | 0:7a64fbb4069d | 345 | netif->autoip->sent_num = 0; |
screamer | 0:7a64fbb4069d | 346 | netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND; |
screamer | 0:7a64fbb4069d | 347 | } else { |
screamer | 0:7a64fbb4069d | 348 | etharp_request(netif, &(netif->autoip->llipaddr)); |
screamer | 0:7a64fbb4069d | 349 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, |
screamer | 0:7a64fbb4069d | 350 | ("autoip_tmr() PROBING Sent Probe\n")); |
screamer | 0:7a64fbb4069d | 351 | netif->autoip->sent_num++; |
screamer | 0:7a64fbb4069d | 352 | /* calculate time to wait to next probe */ |
screamer | 0:7a64fbb4069d | 353 | netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) % |
screamer | 0:7a64fbb4069d | 354 | ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + |
screamer | 0:7a64fbb4069d | 355 | PROBE_MIN * AUTOIP_TICKS_PER_SECOND); |
screamer | 0:7a64fbb4069d | 356 | } |
screamer | 0:7a64fbb4069d | 357 | } |
screamer | 0:7a64fbb4069d | 358 | break; |
screamer | 0:7a64fbb4069d | 359 | |
screamer | 0:7a64fbb4069d | 360 | case AUTOIP_STATE_ANNOUNCING: |
screamer | 0:7a64fbb4069d | 361 | if(netif->autoip->ttw > 0) { |
screamer | 0:7a64fbb4069d | 362 | netif->autoip->ttw--; |
screamer | 0:7a64fbb4069d | 363 | } else { |
screamer | 0:7a64fbb4069d | 364 | if(netif->autoip->sent_num == 0) { |
screamer | 0:7a64fbb4069d | 365 | /* We are here the first time, so we waited ANNOUNCE_WAIT seconds |
screamer | 0:7a64fbb4069d | 366 | * Now we can bind to an IP address and use it |
screamer | 0:7a64fbb4069d | 367 | */ |
screamer | 0:7a64fbb4069d | 368 | autoip_bind(netif); |
screamer | 0:7a64fbb4069d | 369 | } |
screamer | 0:7a64fbb4069d | 370 | |
screamer | 0:7a64fbb4069d | 371 | if(netif->autoip->sent_num == ANNOUNCE_NUM) { |
screamer | 0:7a64fbb4069d | 372 | netif->autoip->state = AUTOIP_STATE_BOUND; |
screamer | 0:7a64fbb4069d | 373 | netif->autoip->sent_num = 0; |
screamer | 0:7a64fbb4069d | 374 | netif->autoip->ttw = 0; |
screamer | 0:7a64fbb4069d | 375 | } else { |
screamer | 0:7a64fbb4069d | 376 | autoip_arp_announce(netif); |
screamer | 0:7a64fbb4069d | 377 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, |
screamer | 0:7a64fbb4069d | 378 | ("autoip_tmr() ANNOUNCING Sent Announce\n")); |
screamer | 0:7a64fbb4069d | 379 | netif->autoip->sent_num++; |
screamer | 0:7a64fbb4069d | 380 | netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
screamer | 0:7a64fbb4069d | 381 | } |
screamer | 0:7a64fbb4069d | 382 | } |
screamer | 0:7a64fbb4069d | 383 | break; |
screamer | 0:7a64fbb4069d | 384 | } |
screamer | 0:7a64fbb4069d | 385 | } |
screamer | 0:7a64fbb4069d | 386 | /* proceed to next network interface */ |
screamer | 0:7a64fbb4069d | 387 | netif = netif->next; |
screamer | 0:7a64fbb4069d | 388 | } |
screamer | 0:7a64fbb4069d | 389 | } |
screamer | 0:7a64fbb4069d | 390 | |
screamer | 0:7a64fbb4069d | 391 | /** |
screamer | 0:7a64fbb4069d | 392 | * Handles every incoming ARP Packet, called by etharp_arp_input. |
screamer | 0:7a64fbb4069d | 393 | * |
screamer | 0:7a64fbb4069d | 394 | * @param netif network interface to use for autoip processing |
screamer | 0:7a64fbb4069d | 395 | * @param hdr Incoming ARP packet |
screamer | 0:7a64fbb4069d | 396 | */ |
screamer | 0:7a64fbb4069d | 397 | void |
screamer | 0:7a64fbb4069d | 398 | autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr) |
screamer | 0:7a64fbb4069d | 399 | { |
screamer | 0:7a64fbb4069d | 400 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_arp_reply()\n")); |
screamer | 0:7a64fbb4069d | 401 | if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) { |
screamer | 0:7a64fbb4069d | 402 | /* when ip.src == llipaddr && hw.src != netif->hwaddr |
screamer | 0:7a64fbb4069d | 403 | * |
screamer | 0:7a64fbb4069d | 404 | * when probing ip.dst == llipaddr && hw.src != netif->hwaddr |
screamer | 0:7a64fbb4069d | 405 | * we have a conflict and must solve it |
screamer | 0:7a64fbb4069d | 406 | */ |
screamer | 0:7a64fbb4069d | 407 | struct ip_addr sipaddr, dipaddr; |
screamer | 0:7a64fbb4069d | 408 | struct eth_addr netifaddr; |
screamer | 0:7a64fbb4069d | 409 | netifaddr.addr[0] = netif->hwaddr[0]; |
screamer | 0:7a64fbb4069d | 410 | netifaddr.addr[1] = netif->hwaddr[1]; |
screamer | 0:7a64fbb4069d | 411 | netifaddr.addr[2] = netif->hwaddr[2]; |
screamer | 0:7a64fbb4069d | 412 | netifaddr.addr[3] = netif->hwaddr[3]; |
screamer | 0:7a64fbb4069d | 413 | netifaddr.addr[4] = netif->hwaddr[4]; |
screamer | 0:7a64fbb4069d | 414 | netifaddr.addr[5] = netif->hwaddr[5]; |
screamer | 0:7a64fbb4069d | 415 | |
screamer | 0:7a64fbb4069d | 416 | /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without |
screamer | 0:7a64fbb4069d | 417 | * structure packing (not using structure copy which breaks strict-aliasing rules). |
screamer | 0:7a64fbb4069d | 418 | */ |
screamer | 0:7a64fbb4069d | 419 | SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr)); |
screamer | 0:7a64fbb4069d | 420 | SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr)); |
screamer | 0:7a64fbb4069d | 421 | |
screamer | 0:7a64fbb4069d | 422 | if ((netif->autoip->state == AUTOIP_STATE_PROBING) || |
screamer | 0:7a64fbb4069d | 423 | ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) && |
screamer | 0:7a64fbb4069d | 424 | (netif->autoip->sent_num == 0))) { |
screamer | 0:7a64fbb4069d | 425 | /* RFC 3927 Section 2.2.1: |
screamer | 0:7a64fbb4069d | 426 | * from beginning to after ANNOUNCE_WAIT |
screamer | 0:7a64fbb4069d | 427 | * seconds we have a conflict if |
screamer | 0:7a64fbb4069d | 428 | * ip.src == llipaddr OR |
screamer | 0:7a64fbb4069d | 429 | * ip.dst == llipaddr && hw.src != own hwaddr |
screamer | 0:7a64fbb4069d | 430 | */ |
screamer | 0:7a64fbb4069d | 431 | if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) || |
screamer | 0:7a64fbb4069d | 432 | (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) && |
screamer | 0:7a64fbb4069d | 433 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) { |
screamer | 0:7a64fbb4069d | 434 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
screamer | 0:7a64fbb4069d | 435 | ("autoip_arp_reply(): Probe Conflict detected\n")); |
screamer | 0:7a64fbb4069d | 436 | autoip_start(netif); |
screamer | 0:7a64fbb4069d | 437 | } |
screamer | 0:7a64fbb4069d | 438 | } else { |
screamer | 0:7a64fbb4069d | 439 | /* RFC 3927 Section 2.5: |
screamer | 0:7a64fbb4069d | 440 | * in any state we have a conflict if |
screamer | 0:7a64fbb4069d | 441 | * ip.src == llipaddr && hw.src != own hwaddr |
screamer | 0:7a64fbb4069d | 442 | */ |
screamer | 0:7a64fbb4069d | 443 | if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) && |
screamer | 0:7a64fbb4069d | 444 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) { |
screamer | 0:7a64fbb4069d | 445 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
screamer | 0:7a64fbb4069d | 446 | ("autoip_arp_reply(): Conflicting ARP-Packet detected\n")); |
screamer | 0:7a64fbb4069d | 447 | autoip_handle_arp_conflict(netif); |
screamer | 0:7a64fbb4069d | 448 | } |
screamer | 0:7a64fbb4069d | 449 | } |
screamer | 0:7a64fbb4069d | 450 | } |
screamer | 0:7a64fbb4069d | 451 | } |
screamer | 0:7a64fbb4069d | 452 | |
screamer | 0:7a64fbb4069d | 453 | #endif /* LWIP_AUTOIP */ |