Pehr Hovey
Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
Core/lwIP/core/ipv4/autoip.c@0:a548a085de55, 2010-03-14 (annotated)
- Committer:
- pehrhovey
- Date:
- Sun Mar 14 00:54:12 2010 +0000
- Revision:
- 0:a548a085de55
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| pehrhovey | 0:a548a085de55 | 1 | /** |
| pehrhovey | 0:a548a085de55 | 2 | * @file |
| pehrhovey | 0:a548a085de55 | 3 | * AutoIP Automatic LinkLocal IP Configuration |
| pehrhovey | 0:a548a085de55 | 4 | * |
| pehrhovey | 0:a548a085de55 | 5 | */ |
| pehrhovey | 0:a548a085de55 | 6 | |
| pehrhovey | 0:a548a085de55 | 7 | /* |
| pehrhovey | 0:a548a085de55 | 8 | * |
| pehrhovey | 0:a548a085de55 | 9 | * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de> |
| pehrhovey | 0:a548a085de55 | 10 | * All rights reserved. |
| pehrhovey | 0:a548a085de55 | 11 | * |
| pehrhovey | 0:a548a085de55 | 12 | * Redistribution and use in source and binary forms, with or without modification, |
| pehrhovey | 0:a548a085de55 | 13 | * are permitted provided that the following conditions are met: |
| pehrhovey | 0:a548a085de55 | 14 | * |
| pehrhovey | 0:a548a085de55 | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 16 | * this list of conditions and the following disclaimer. |
| pehrhovey | 0:a548a085de55 | 17 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 18 | * this list of conditions and the following disclaimer in the documentation |
| pehrhovey | 0:a548a085de55 | 19 | * and/or other materials provided with the distribution. |
| pehrhovey | 0:a548a085de55 | 20 | * 3. The name of the author may not be used to endorse or promote products |
| pehrhovey | 0:a548a085de55 | 21 | * derived from this software without specific prior written permission. |
| pehrhovey | 0:a548a085de55 | 22 | * |
| pehrhovey | 0:a548a085de55 | 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| pehrhovey | 0:a548a085de55 | 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| pehrhovey | 0:a548a085de55 | 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| pehrhovey | 0:a548a085de55 | 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| pehrhovey | 0:a548a085de55 | 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| pehrhovey | 0:a548a085de55 | 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| pehrhovey | 0:a548a085de55 | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| pehrhovey | 0:a548a085de55 | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| pehrhovey | 0:a548a085de55 | 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| pehrhovey | 0:a548a085de55 | 32 | * OF SUCH DAMAGE. |
| pehrhovey | 0:a548a085de55 | 33 | * |
| pehrhovey | 0:a548a085de55 | 34 | * Author: Dominik Spies <kontakt@dspies.de> |
| pehrhovey | 0:a548a085de55 | 35 | * |
| pehrhovey | 0:a548a085de55 | 36 | * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform |
| pehrhovey | 0:a548a085de55 | 37 | * with RFC 3927. |
| pehrhovey | 0:a548a085de55 | 38 | * |
| pehrhovey | 0:a548a085de55 | 39 | * |
| pehrhovey | 0:a548a085de55 | 40 | * Please coordinate changes and requests with Dominik Spies |
| pehrhovey | 0:a548a085de55 | 41 | * <kontakt@dspies.de> |
| pehrhovey | 0:a548a085de55 | 42 | */ |
| pehrhovey | 0:a548a085de55 | 43 | |
| pehrhovey | 0:a548a085de55 | 44 | /******************************************************************************* |
| pehrhovey | 0:a548a085de55 | 45 | * USAGE: |
| pehrhovey | 0:a548a085de55 | 46 | * |
| pehrhovey | 0:a548a085de55 | 47 | * define LWIP_AUTOIP 1 in your lwipopts.h |
| pehrhovey | 0:a548a085de55 | 48 | * |
| pehrhovey | 0:a548a085de55 | 49 | * If you don't use tcpip.c (so, don't call, you don't call tcpip_init): |
| pehrhovey | 0:a548a085de55 | 50 | * - First, call autoip_init(). |
| pehrhovey | 0:a548a085de55 | 51 | * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces, |
| pehrhovey | 0:a548a085de55 | 52 | * that should be defined in autoip.h. |
| pehrhovey | 0:a548a085de55 | 53 | * I recommend a value of 100. The value must divide 1000 with a remainder almost 0. |
| pehrhovey | 0:a548a085de55 | 54 | * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 .... |
| pehrhovey | 0:a548a085de55 | 55 | * |
| pehrhovey | 0:a548a085de55 | 56 | * Without DHCP: |
| pehrhovey | 0:a548a085de55 | 57 | * - Call autoip_start() after netif_add(). |
| pehrhovey | 0:a548a085de55 | 58 | * |
| pehrhovey | 0:a548a085de55 | 59 | * With DHCP: |
| pehrhovey | 0:a548a085de55 | 60 | * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h. |
| pehrhovey | 0:a548a085de55 | 61 | * - Configure your DHCP Client. |
| pehrhovey | 0:a548a085de55 | 62 | * |
| pehrhovey | 0:a548a085de55 | 63 | */ |
| pehrhovey | 0:a548a085de55 | 64 | |
| pehrhovey | 0:a548a085de55 | 65 | #include "lwip/opt.h" |
| pehrhovey | 0:a548a085de55 | 66 | |
| pehrhovey | 0:a548a085de55 | 67 | #if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */ |
| pehrhovey | 0:a548a085de55 | 68 | |
| pehrhovey | 0:a548a085de55 | 69 | #include "lwip/mem.h" |
| pehrhovey | 0:a548a085de55 | 70 | #include "lwip/udp.h" |
| pehrhovey | 0:a548a085de55 | 71 | #include "lwip/ip_addr.h" |
| pehrhovey | 0:a548a085de55 | 72 | #include "lwip/netif.h" |
| pehrhovey | 0:a548a085de55 | 73 | #include "lwip/autoip.h" |
| pehrhovey | 0:a548a085de55 | 74 | #include "netif/etharp.h" |
| pehrhovey | 0:a548a085de55 | 75 | |
| pehrhovey | 0:a548a085de55 | 76 | #include <stdlib.h> |
| pehrhovey | 0:a548a085de55 | 77 | #include <string.h> |
| pehrhovey | 0:a548a085de55 | 78 | |
| pehrhovey | 0:a548a085de55 | 79 | /* 169.254.0.0 */ |
| pehrhovey | 0:a548a085de55 | 80 | #define AUTOIP_NET 0xA9FE0000 |
| pehrhovey | 0:a548a085de55 | 81 | /* 169.254.1.0 */ |
| pehrhovey | 0:a548a085de55 | 82 | #define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100) |
| pehrhovey | 0:a548a085de55 | 83 | /* 169.254.254.255 */ |
| pehrhovey | 0:a548a085de55 | 84 | #define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF) |
| pehrhovey | 0:a548a085de55 | 85 | |
| pehrhovey | 0:a548a085de55 | 86 | |
| pehrhovey | 0:a548a085de55 | 87 | /** Pseudo random macro based on netif informations. |
| pehrhovey | 0:a548a085de55 | 88 | * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */ |
| pehrhovey | 0:a548a085de55 | 89 | #ifndef LWIP_AUTOIP_RAND |
| pehrhovey | 0:a548a085de55 | 90 | #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \ |
| pehrhovey | 0:a548a085de55 | 91 | ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \ |
| pehrhovey | 0:a548a085de55 | 92 | ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \ |
| pehrhovey | 0:a548a085de55 | 93 | ((u32_t)((netif->hwaddr[4]) & 0xff))) + \ |
| pehrhovey | 0:a548a085de55 | 94 | (netif->autoip?netif->autoip->tried_llipaddr:0)) |
| pehrhovey | 0:a548a085de55 | 95 | #endif /* LWIP_AUTOIP_RAND */ |
| pehrhovey | 0:a548a085de55 | 96 | |
| pehrhovey | 0:a548a085de55 | 97 | /** |
| pehrhovey | 0:a548a085de55 | 98 | * Macro that generates the initial IP address to be tried by AUTOIP. |
| pehrhovey | 0:a548a085de55 | 99 | * If you want to override this, define it to something else in lwipopts.h. |
| pehrhovey | 0:a548a085de55 | 100 | */ |
| pehrhovey | 0:a548a085de55 | 101 | #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR |
| pehrhovey | 0:a548a085de55 | 102 | #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \ |
| pehrhovey | 0:a548a085de55 | 103 | htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \ |
| pehrhovey | 0:a548a085de55 | 104 | ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8))) |
| pehrhovey | 0:a548a085de55 | 105 | #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */ |
| pehrhovey | 0:a548a085de55 | 106 | |
| pehrhovey | 0:a548a085de55 | 107 | /* static functions */ |
| pehrhovey | 0:a548a085de55 | 108 | static void autoip_handle_arp_conflict(struct netif *netif); |
| pehrhovey | 0:a548a085de55 | 109 | |
| pehrhovey | 0:a548a085de55 | 110 | /* creates a pseudo random LL IP-Address for a network interface */ |
| pehrhovey | 0:a548a085de55 | 111 | static void autoip_create_addr(struct netif *netif, struct ip_addr *ipaddr); |
| pehrhovey | 0:a548a085de55 | 112 | |
| pehrhovey | 0:a548a085de55 | 113 | /* sends an ARP probe */ |
| pehrhovey | 0:a548a085de55 | 114 | static err_t autoip_arp_probe(struct netif *netif); |
| pehrhovey | 0:a548a085de55 | 115 | |
| pehrhovey | 0:a548a085de55 | 116 | /* sends an ARP announce */ |
| pehrhovey | 0:a548a085de55 | 117 | static err_t autoip_arp_announce(struct netif *netif); |
| pehrhovey | 0:a548a085de55 | 118 | |
| pehrhovey | 0:a548a085de55 | 119 | /* configure interface for use with current LL IP-Address */ |
| pehrhovey | 0:a548a085de55 | 120 | static err_t autoip_bind(struct netif *netif); |
| pehrhovey | 0:a548a085de55 | 121 | |
| pehrhovey | 0:a548a085de55 | 122 | /* start sending probes for llipaddr */ |
| pehrhovey | 0:a548a085de55 | 123 | static void autoip_start_probing(struct netif *netif); |
| pehrhovey | 0:a548a085de55 | 124 | |
| pehrhovey | 0:a548a085de55 | 125 | /** |
| pehrhovey | 0:a548a085de55 | 126 | * Initialize this module |
| pehrhovey | 0:a548a085de55 | 127 | */ |
| pehrhovey | 0:a548a085de55 | 128 | void |
| pehrhovey | 0:a548a085de55 | 129 | autoip_init(void) |
| pehrhovey | 0:a548a085de55 | 130 | { |
| pehrhovey | 0:a548a085de55 | 131 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n")); |
| pehrhovey | 0:a548a085de55 | 132 | } |
| pehrhovey | 0:a548a085de55 | 133 | |
| pehrhovey | 0:a548a085de55 | 134 | /** |
| pehrhovey | 0:a548a085de55 | 135 | * Handle a IP address conflict after an ARP conflict detection |
| pehrhovey | 0:a548a085de55 | 136 | */ |
| pehrhovey | 0:a548a085de55 | 137 | static void |
| pehrhovey | 0:a548a085de55 | 138 | autoip_handle_arp_conflict(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 139 | { |
| pehrhovey | 0:a548a085de55 | 140 | /* Somehow detect if we are defending or retreating */ |
| pehrhovey | 0:a548a085de55 | 141 | unsigned char defend = 1; /* tbd */ |
| pehrhovey | 0:a548a085de55 | 142 | |
| pehrhovey | 0:a548a085de55 | 143 | if(defend) { |
| pehrhovey | 0:a548a085de55 | 144 | if(netif->autoip->lastconflict > 0) { |
| pehrhovey | 0:a548a085de55 | 145 | /* retreat, there was a conflicting ARP in the last |
| pehrhovey | 0:a548a085de55 | 146 | * DEFEND_INTERVAL seconds |
| pehrhovey | 0:a548a085de55 | 147 | */ |
| pehrhovey | 0:a548a085de55 | 148 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
| pehrhovey | 0:a548a085de55 | 149 | ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n")); |
| pehrhovey | 0:a548a085de55 | 150 | |
| pehrhovey | 0:a548a085de55 | 151 | /* TODO: close all TCP sessions */ |
| pehrhovey | 0:a548a085de55 | 152 | autoip_start(netif); |
| pehrhovey | 0:a548a085de55 | 153 | } else { |
| pehrhovey | 0:a548a085de55 | 154 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
| pehrhovey | 0:a548a085de55 | 155 | ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n")); |
| pehrhovey | 0:a548a085de55 | 156 | autoip_arp_announce(netif); |
| pehrhovey | 0:a548a085de55 | 157 | netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
| pehrhovey | 0:a548a085de55 | 158 | } |
| pehrhovey | 0:a548a085de55 | 159 | } else { |
| pehrhovey | 0:a548a085de55 | 160 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
| pehrhovey | 0:a548a085de55 | 161 | ("autoip_handle_arp_conflict(): we do not defend, retreating\n")); |
| pehrhovey | 0:a548a085de55 | 162 | /* TODO: close all TCP sessions */ |
| pehrhovey | 0:a548a085de55 | 163 | autoip_start(netif); |
| pehrhovey | 0:a548a085de55 | 164 | } |
| pehrhovey | 0:a548a085de55 | 165 | } |
| pehrhovey | 0:a548a085de55 | 166 | |
| pehrhovey | 0:a548a085de55 | 167 | /** |
| pehrhovey | 0:a548a085de55 | 168 | * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255 |
| pehrhovey | 0:a548a085de55 | 169 | * |
| pehrhovey | 0:a548a085de55 | 170 | * @param netif network interface on which create the IP-Address |
| pehrhovey | 0:a548a085de55 | 171 | * @param ipaddr ip address to initialize |
| pehrhovey | 0:a548a085de55 | 172 | */ |
| pehrhovey | 0:a548a085de55 | 173 | static void |
| pehrhovey | 0:a548a085de55 | 174 | autoip_create_addr(struct netif *netif, struct ip_addr *ipaddr) |
| pehrhovey | 0:a548a085de55 | 175 | { |
| pehrhovey | 0:a548a085de55 | 176 | /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255 |
| pehrhovey | 0:a548a085de55 | 177 | * compliant to RFC 3927 Section 2.1 |
| pehrhovey | 0:a548a085de55 | 178 | * We have 254 * 256 possibilities */ |
| pehrhovey | 0:a548a085de55 | 179 | |
| pehrhovey | 0:a548a085de55 | 180 | u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif)); |
| pehrhovey | 0:a548a085de55 | 181 | addr += netif->autoip->tried_llipaddr; |
| pehrhovey | 0:a548a085de55 | 182 | addr = AUTOIP_NET | (addr & 0xffff); |
| pehrhovey | 0:a548a085de55 | 183 | /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */ |
| pehrhovey | 0:a548a085de55 | 184 | |
| pehrhovey | 0:a548a085de55 | 185 | if (addr < AUTOIP_RANGE_START) { |
| pehrhovey | 0:a548a085de55 | 186 | addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; |
| pehrhovey | 0:a548a085de55 | 187 | } |
| pehrhovey | 0:a548a085de55 | 188 | if (addr > AUTOIP_RANGE_END) { |
| pehrhovey | 0:a548a085de55 | 189 | addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1; |
| pehrhovey | 0:a548a085de55 | 190 | } |
| pehrhovey | 0:a548a085de55 | 191 | LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) && |
| pehrhovey | 0:a548a085de55 | 192 | (addr <= AUTOIP_RANGE_END)); |
| pehrhovey | 0:a548a085de55 | 193 | ipaddr->addr = htonl(addr); |
| pehrhovey | 0:a548a085de55 | 194 | |
| pehrhovey | 0:a548a085de55 | 195 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
| pehrhovey | 0:a548a085de55 | 196 | ("autoip_create_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n", |
| pehrhovey | 0:a548a085de55 | 197 | (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(ipaddr->addr))); |
| pehrhovey | 0:a548a085de55 | 198 | } |
| pehrhovey | 0:a548a085de55 | 199 | |
| pehrhovey | 0:a548a085de55 | 200 | /** |
| pehrhovey | 0:a548a085de55 | 201 | * Sends an ARP probe from a network interface |
| pehrhovey | 0:a548a085de55 | 202 | * |
| pehrhovey | 0:a548a085de55 | 203 | * @param netif network interface used to send the probe |
| pehrhovey | 0:a548a085de55 | 204 | */ |
| pehrhovey | 0:a548a085de55 | 205 | static err_t |
| pehrhovey | 0:a548a085de55 | 206 | autoip_arp_probe(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 207 | { |
| pehrhovey | 0:a548a085de55 | 208 | return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, |
| pehrhovey | 0:a548a085de55 | 209 | (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, ðzero, |
| pehrhovey | 0:a548a085de55 | 210 | &netif->autoip->llipaddr, ARP_REQUEST); |
| pehrhovey | 0:a548a085de55 | 211 | } |
| pehrhovey | 0:a548a085de55 | 212 | |
| pehrhovey | 0:a548a085de55 | 213 | /** |
| pehrhovey | 0:a548a085de55 | 214 | * Sends an ARP announce from a network interface |
| pehrhovey | 0:a548a085de55 | 215 | * |
| pehrhovey | 0:a548a085de55 | 216 | * @param netif network interface used to send the announce |
| pehrhovey | 0:a548a085de55 | 217 | */ |
| pehrhovey | 0:a548a085de55 | 218 | static err_t |
| pehrhovey | 0:a548a085de55 | 219 | autoip_arp_announce(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 220 | { |
| pehrhovey | 0:a548a085de55 | 221 | return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast, |
| pehrhovey | 0:a548a085de55 | 222 | (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero, |
| pehrhovey | 0:a548a085de55 | 223 | &netif->autoip->llipaddr, ARP_REQUEST); |
| pehrhovey | 0:a548a085de55 | 224 | } |
| pehrhovey | 0:a548a085de55 | 225 | |
| pehrhovey | 0:a548a085de55 | 226 | /** |
| pehrhovey | 0:a548a085de55 | 227 | * Configure interface for use with current LL IP-Address |
| pehrhovey | 0:a548a085de55 | 228 | * |
| pehrhovey | 0:a548a085de55 | 229 | * @param netif network interface to configure with current LL IP-Address |
| pehrhovey | 0:a548a085de55 | 230 | */ |
| pehrhovey | 0:a548a085de55 | 231 | static err_t |
| pehrhovey | 0:a548a085de55 | 232 | autoip_bind(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 233 | { |
| pehrhovey | 0:a548a085de55 | 234 | struct autoip *autoip = netif->autoip; |
| pehrhovey | 0:a548a085de55 | 235 | struct ip_addr sn_mask, gw_addr; |
| pehrhovey | 0:a548a085de55 | 236 | |
| pehrhovey | 0:a548a085de55 | 237 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, |
| pehrhovey | 0:a548a085de55 | 238 | ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n", |
| pehrhovey | 0:a548a085de55 | 239 | (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr)); |
| pehrhovey | 0:a548a085de55 | 240 | |
| pehrhovey | 0:a548a085de55 | 241 | IP4_ADDR(&sn_mask, 255, 255, 0, 0); |
| pehrhovey | 0:a548a085de55 | 242 | IP4_ADDR(&gw_addr, 0, 0, 0, 0); |
| pehrhovey | 0:a548a085de55 | 243 | |
| pehrhovey | 0:a548a085de55 | 244 | netif_set_ipaddr(netif, &autoip->llipaddr); |
| pehrhovey | 0:a548a085de55 | 245 | netif_set_netmask(netif, &sn_mask); |
| pehrhovey | 0:a548a085de55 | 246 | netif_set_gw(netif, &gw_addr); |
| pehrhovey | 0:a548a085de55 | 247 | |
| pehrhovey | 0:a548a085de55 | 248 | /* bring the interface up */ |
| pehrhovey | 0:a548a085de55 | 249 | netif_set_up(netif); |
| pehrhovey | 0:a548a085de55 | 250 | |
| pehrhovey | 0:a548a085de55 | 251 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 252 | } |
| pehrhovey | 0:a548a085de55 | 253 | |
| pehrhovey | 0:a548a085de55 | 254 | /** |
| pehrhovey | 0:a548a085de55 | 255 | * Start AutoIP client |
| pehrhovey | 0:a548a085de55 | 256 | * |
| pehrhovey | 0:a548a085de55 | 257 | * @param netif network interface on which start the AutoIP client |
| pehrhovey | 0:a548a085de55 | 258 | */ |
| pehrhovey | 0:a548a085de55 | 259 | err_t |
| pehrhovey | 0:a548a085de55 | 260 | autoip_start(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 261 | { |
| pehrhovey | 0:a548a085de55 | 262 | struct autoip *autoip = netif->autoip; |
| pehrhovey | 0:a548a085de55 | 263 | err_t result = ERR_OK; |
| pehrhovey | 0:a548a085de55 | 264 | |
| pehrhovey | 0:a548a085de55 | 265 | if(netif_is_up(netif)) { |
| pehrhovey | 0:a548a085de55 | 266 | netif_set_down(netif); |
| pehrhovey | 0:a548a085de55 | 267 | } |
| pehrhovey | 0:a548a085de55 | 268 | |
| pehrhovey | 0:a548a085de55 | 269 | /* Set IP-Address, Netmask and Gateway to 0 to make sure that |
| pehrhovey | 0:a548a085de55 | 270 | * ARP Packets are formed correctly |
| pehrhovey | 0:a548a085de55 | 271 | */ |
| pehrhovey | 0:a548a085de55 | 272 | netif->ip_addr.addr = 0; |
| pehrhovey | 0:a548a085de55 | 273 | netif->netmask.addr = 0; |
| pehrhovey | 0:a548a085de55 | 274 | netif->gw.addr = 0; |
| pehrhovey | 0:a548a085de55 | 275 | |
| pehrhovey | 0:a548a085de55 | 276 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, |
| pehrhovey | 0:a548a085de55 | 277 | ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], |
| pehrhovey | 0:a548a085de55 | 278 | netif->name[1], (u16_t)netif->num)); |
| pehrhovey | 0:a548a085de55 | 279 | if(autoip == NULL) { |
| pehrhovey | 0:a548a085de55 | 280 | /* no AutoIP client attached yet? */ |
| pehrhovey | 0:a548a085de55 | 281 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| pehrhovey | 0:a548a085de55 | 282 | ("autoip_start(): starting new AUTOIP client\n")); |
| pehrhovey | 0:a548a085de55 | 283 | autoip = mem_malloc(sizeof(struct autoip)); |
| pehrhovey | 0:a548a085de55 | 284 | if(autoip == NULL) { |
| pehrhovey | 0:a548a085de55 | 285 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| pehrhovey | 0:a548a085de55 | 286 | ("autoip_start(): could not allocate autoip\n")); |
| pehrhovey | 0:a548a085de55 | 287 | return ERR_MEM; |
| pehrhovey | 0:a548a085de55 | 288 | } |
| pehrhovey | 0:a548a085de55 | 289 | memset( autoip, 0, sizeof(struct autoip)); |
| pehrhovey | 0:a548a085de55 | 290 | /* store this AutoIP client in the netif */ |
| pehrhovey | 0:a548a085de55 | 291 | netif->autoip = autoip; |
| pehrhovey | 0:a548a085de55 | 292 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip")); |
| pehrhovey | 0:a548a085de55 | 293 | } else { |
| pehrhovey | 0:a548a085de55 | 294 | autoip->state = AUTOIP_STATE_OFF; |
| pehrhovey | 0:a548a085de55 | 295 | autoip->ttw = 0; |
| pehrhovey | 0:a548a085de55 | 296 | autoip->sent_num = 0; |
| pehrhovey | 0:a548a085de55 | 297 | memset(&autoip->llipaddr, 0, sizeof(struct ip_addr)); |
| pehrhovey | 0:a548a085de55 | 298 | autoip->lastconflict = 0; |
| pehrhovey | 0:a548a085de55 | 299 | } |
| pehrhovey | 0:a548a085de55 | 300 | |
| pehrhovey | 0:a548a085de55 | 301 | autoip_create_addr(netif, &(autoip->llipaddr)); |
| pehrhovey | 0:a548a085de55 | 302 | autoip->tried_llipaddr++; |
| pehrhovey | 0:a548a085de55 | 303 | autoip_start_probing(netif); |
| pehrhovey | 0:a548a085de55 | 304 | |
| pehrhovey | 0:a548a085de55 | 305 | return result; |
| pehrhovey | 0:a548a085de55 | 306 | } |
| pehrhovey | 0:a548a085de55 | 307 | |
| pehrhovey | 0:a548a085de55 | 308 | static void |
| pehrhovey | 0:a548a085de55 | 309 | autoip_start_probing(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 310 | { |
| pehrhovey | 0:a548a085de55 | 311 | struct autoip *autoip = netif->autoip; |
| pehrhovey | 0:a548a085de55 | 312 | |
| pehrhovey | 0:a548a085de55 | 313 | autoip->state = AUTOIP_STATE_PROBING; |
| pehrhovey | 0:a548a085de55 | 314 | autoip->sent_num = 0; |
| pehrhovey | 0:a548a085de55 | 315 | |
| pehrhovey | 0:a548a085de55 | 316 | /* time to wait to first probe, this is randomly |
| pehrhovey | 0:a548a085de55 | 317 | * choosen out of 0 to PROBE_WAIT seconds. |
| pehrhovey | 0:a548a085de55 | 318 | * compliant to RFC 3927 Section 2.2.1 |
| pehrhovey | 0:a548a085de55 | 319 | */ |
| pehrhovey | 0:a548a085de55 | 320 | autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND)); |
| pehrhovey | 0:a548a085de55 | 321 | |
| pehrhovey | 0:a548a085de55 | 322 | /* |
| pehrhovey | 0:a548a085de55 | 323 | * if we tried more then MAX_CONFLICTS we must limit our rate for |
| pehrhovey | 0:a548a085de55 | 324 | * accquiring and probing address |
| pehrhovey | 0:a548a085de55 | 325 | * compliant to RFC 3927 Section 2.2.1 |
| pehrhovey | 0:a548a085de55 | 326 | */ |
| pehrhovey | 0:a548a085de55 | 327 | if(autoip->tried_llipaddr > MAX_CONFLICTS) { |
| pehrhovey | 0:a548a085de55 | 328 | autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
| pehrhovey | 0:a548a085de55 | 329 | } |
| pehrhovey | 0:a548a085de55 | 330 | } |
| pehrhovey | 0:a548a085de55 | 331 | |
| pehrhovey | 0:a548a085de55 | 332 | /** |
| pehrhovey | 0:a548a085de55 | 333 | * Handle a possible change in the network configuration. |
| pehrhovey | 0:a548a085de55 | 334 | * |
| pehrhovey | 0:a548a085de55 | 335 | * If there is an AutoIP address configured, take the interface down |
| pehrhovey | 0:a548a085de55 | 336 | * and begin probing with the same address. |
| pehrhovey | 0:a548a085de55 | 337 | */ |
| pehrhovey | 0:a548a085de55 | 338 | void |
| pehrhovey | 0:a548a085de55 | 339 | autoip_network_changed(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 340 | { |
| pehrhovey | 0:a548a085de55 | 341 | if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) { |
| pehrhovey | 0:a548a085de55 | 342 | netif_set_down(netif); |
| pehrhovey | 0:a548a085de55 | 343 | autoip_start_probing(netif); |
| pehrhovey | 0:a548a085de55 | 344 | } |
| pehrhovey | 0:a548a085de55 | 345 | } |
| pehrhovey | 0:a548a085de55 | 346 | |
| pehrhovey | 0:a548a085de55 | 347 | /** |
| pehrhovey | 0:a548a085de55 | 348 | * Stop AutoIP client |
| pehrhovey | 0:a548a085de55 | 349 | * |
| pehrhovey | 0:a548a085de55 | 350 | * @param netif network interface on which stop the AutoIP client |
| pehrhovey | 0:a548a085de55 | 351 | */ |
| pehrhovey | 0:a548a085de55 | 352 | err_t |
| pehrhovey | 0:a548a085de55 | 353 | autoip_stop(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 354 | { |
| pehrhovey | 0:a548a085de55 | 355 | netif->autoip->state = AUTOIP_STATE_OFF; |
| pehrhovey | 0:a548a085de55 | 356 | netif_set_down(netif); |
| pehrhovey | 0:a548a085de55 | 357 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 358 | } |
| pehrhovey | 0:a548a085de55 | 359 | |
| pehrhovey | 0:a548a085de55 | 360 | /** |
| pehrhovey | 0:a548a085de55 | 361 | * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds |
| pehrhovey | 0:a548a085de55 | 362 | */ |
| pehrhovey | 0:a548a085de55 | 363 | void |
| pehrhovey | 0:a548a085de55 | 364 | autoip_tmr() |
| pehrhovey | 0:a548a085de55 | 365 | { |
| pehrhovey | 0:a548a085de55 | 366 | struct netif *netif = netif_list; |
| pehrhovey | 0:a548a085de55 | 367 | /* loop through netif's */ |
| pehrhovey | 0:a548a085de55 | 368 | while (netif != NULL) { |
| pehrhovey | 0:a548a085de55 | 369 | /* only act on AutoIP configured interfaces */ |
| pehrhovey | 0:a548a085de55 | 370 | if (netif->autoip != NULL) { |
| pehrhovey | 0:a548a085de55 | 371 | if(netif->autoip->lastconflict > 0) { |
| pehrhovey | 0:a548a085de55 | 372 | netif->autoip->lastconflict--; |
| pehrhovey | 0:a548a085de55 | 373 | } |
| pehrhovey | 0:a548a085de55 | 374 | |
| pehrhovey | 0:a548a085de55 | 375 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, |
| pehrhovey | 0:a548a085de55 | 376 | ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", |
| pehrhovey | 0:a548a085de55 | 377 | (u16_t)(netif->autoip->state), netif->autoip->ttw)); |
| pehrhovey | 0:a548a085de55 | 378 | |
| pehrhovey | 0:a548a085de55 | 379 | switch(netif->autoip->state) { |
| pehrhovey | 0:a548a085de55 | 380 | case AUTOIP_STATE_PROBING: |
| pehrhovey | 0:a548a085de55 | 381 | if(netif->autoip->ttw > 0) { |
| pehrhovey | 0:a548a085de55 | 382 | netif->autoip->ttw--; |
| pehrhovey | 0:a548a085de55 | 383 | } else { |
| pehrhovey | 0:a548a085de55 | 384 | if(netif->autoip->sent_num >= PROBE_NUM) { |
| pehrhovey | 0:a548a085de55 | 385 | netif->autoip->state = AUTOIP_STATE_ANNOUNCING; |
| pehrhovey | 0:a548a085de55 | 386 | netif->autoip->sent_num = 0; |
| pehrhovey | 0:a548a085de55 | 387 | netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND; |
| pehrhovey | 0:a548a085de55 | 388 | } else { |
| pehrhovey | 0:a548a085de55 | 389 | autoip_arp_probe(netif); |
| pehrhovey | 0:a548a085de55 | 390 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, |
| pehrhovey | 0:a548a085de55 | 391 | ("autoip_tmr() PROBING Sent Probe\n")); |
| pehrhovey | 0:a548a085de55 | 392 | netif->autoip->sent_num++; |
| pehrhovey | 0:a548a085de55 | 393 | /* calculate time to wait to next probe */ |
| pehrhovey | 0:a548a085de55 | 394 | netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) % |
| pehrhovey | 0:a548a085de55 | 395 | ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + |
| pehrhovey | 0:a548a085de55 | 396 | PROBE_MIN * AUTOIP_TICKS_PER_SECOND); |
| pehrhovey | 0:a548a085de55 | 397 | } |
| pehrhovey | 0:a548a085de55 | 398 | } |
| pehrhovey | 0:a548a085de55 | 399 | break; |
| pehrhovey | 0:a548a085de55 | 400 | |
| pehrhovey | 0:a548a085de55 | 401 | case AUTOIP_STATE_ANNOUNCING: |
| pehrhovey | 0:a548a085de55 | 402 | if(netif->autoip->ttw > 0) { |
| pehrhovey | 0:a548a085de55 | 403 | netif->autoip->ttw--; |
| pehrhovey | 0:a548a085de55 | 404 | } else { |
| pehrhovey | 0:a548a085de55 | 405 | if(netif->autoip->sent_num == 0) { |
| pehrhovey | 0:a548a085de55 | 406 | /* We are here the first time, so we waited ANNOUNCE_WAIT seconds |
| pehrhovey | 0:a548a085de55 | 407 | * Now we can bind to an IP address and use it. |
| pehrhovey | 0:a548a085de55 | 408 | * |
| pehrhovey | 0:a548a085de55 | 409 | * autoip_bind calls netif_set_up. This triggers a gratuitous ARP |
| pehrhovey | 0:a548a085de55 | 410 | * which counts as an announcement. |
| pehrhovey | 0:a548a085de55 | 411 | */ |
| pehrhovey | 0:a548a085de55 | 412 | autoip_bind(netif); |
| pehrhovey | 0:a548a085de55 | 413 | } else { |
| pehrhovey | 0:a548a085de55 | 414 | autoip_arp_announce(netif); |
| pehrhovey | 0:a548a085de55 | 415 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, |
| pehrhovey | 0:a548a085de55 | 416 | ("autoip_tmr() ANNOUNCING Sent Announce\n")); |
| pehrhovey | 0:a548a085de55 | 417 | } |
| pehrhovey | 0:a548a085de55 | 418 | netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND; |
| pehrhovey | 0:a548a085de55 | 419 | netif->autoip->sent_num++; |
| pehrhovey | 0:a548a085de55 | 420 | |
| pehrhovey | 0:a548a085de55 | 421 | if(netif->autoip->sent_num >= ANNOUNCE_NUM) { |
| pehrhovey | 0:a548a085de55 | 422 | netif->autoip->state = AUTOIP_STATE_BOUND; |
| pehrhovey | 0:a548a085de55 | 423 | netif->autoip->sent_num = 0; |
| pehrhovey | 0:a548a085de55 | 424 | netif->autoip->ttw = 0; |
| pehrhovey | 0:a548a085de55 | 425 | } |
| pehrhovey | 0:a548a085de55 | 426 | } |
| pehrhovey | 0:a548a085de55 | 427 | break; |
| pehrhovey | 0:a548a085de55 | 428 | } |
| pehrhovey | 0:a548a085de55 | 429 | } |
| pehrhovey | 0:a548a085de55 | 430 | /* proceed to next network interface */ |
| pehrhovey | 0:a548a085de55 | 431 | netif = netif->next; |
| pehrhovey | 0:a548a085de55 | 432 | } |
| pehrhovey | 0:a548a085de55 | 433 | } |
| pehrhovey | 0:a548a085de55 | 434 | |
| pehrhovey | 0:a548a085de55 | 435 | /** |
| pehrhovey | 0:a548a085de55 | 436 | * Handles every incoming ARP Packet, called by etharp_arp_input. |
| pehrhovey | 0:a548a085de55 | 437 | * |
| pehrhovey | 0:a548a085de55 | 438 | * @param netif network interface to use for autoip processing |
| pehrhovey | 0:a548a085de55 | 439 | * @param hdr Incoming ARP packet |
| pehrhovey | 0:a548a085de55 | 440 | */ |
| pehrhovey | 0:a548a085de55 | 441 | void |
| pehrhovey | 0:a548a085de55 | 442 | autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr) |
| pehrhovey | 0:a548a085de55 | 443 | { |
| pehrhovey | 0:a548a085de55 | 444 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_arp_reply()\n")); |
| pehrhovey | 0:a548a085de55 | 445 | if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) { |
| pehrhovey | 0:a548a085de55 | 446 | /* when ip.src == llipaddr && hw.src != netif->hwaddr |
| pehrhovey | 0:a548a085de55 | 447 | * |
| pehrhovey | 0:a548a085de55 | 448 | * when probing ip.dst == llipaddr && hw.src != netif->hwaddr |
| pehrhovey | 0:a548a085de55 | 449 | * we have a conflict and must solve it |
| pehrhovey | 0:a548a085de55 | 450 | */ |
| pehrhovey | 0:a548a085de55 | 451 | struct ip_addr sipaddr, dipaddr; |
| pehrhovey | 0:a548a085de55 | 452 | struct eth_addr netifaddr; |
| pehrhovey | 0:a548a085de55 | 453 | netifaddr.addr[0] = netif->hwaddr[0]; |
| pehrhovey | 0:a548a085de55 | 454 | netifaddr.addr[1] = netif->hwaddr[1]; |
| pehrhovey | 0:a548a085de55 | 455 | netifaddr.addr[2] = netif->hwaddr[2]; |
| pehrhovey | 0:a548a085de55 | 456 | netifaddr.addr[3] = netif->hwaddr[3]; |
| pehrhovey | 0:a548a085de55 | 457 | netifaddr.addr[4] = netif->hwaddr[4]; |
| pehrhovey | 0:a548a085de55 | 458 | netifaddr.addr[5] = netif->hwaddr[5]; |
| pehrhovey | 0:a548a085de55 | 459 | |
| pehrhovey | 0:a548a085de55 | 460 | /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without |
| pehrhovey | 0:a548a085de55 | 461 | * structure packing (not using structure copy which breaks strict-aliasing rules). |
| pehrhovey | 0:a548a085de55 | 462 | */ |
| pehrhovey | 0:a548a085de55 | 463 | SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr)); |
| pehrhovey | 0:a548a085de55 | 464 | SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr)); |
| pehrhovey | 0:a548a085de55 | 465 | |
| pehrhovey | 0:a548a085de55 | 466 | if ((netif->autoip->state == AUTOIP_STATE_PROBING) || |
| pehrhovey | 0:a548a085de55 | 467 | ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) && |
| pehrhovey | 0:a548a085de55 | 468 | (netif->autoip->sent_num == 0))) { |
| pehrhovey | 0:a548a085de55 | 469 | /* RFC 3927 Section 2.2.1: |
| pehrhovey | 0:a548a085de55 | 470 | * from beginning to after ANNOUNCE_WAIT |
| pehrhovey | 0:a548a085de55 | 471 | * seconds we have a conflict if |
| pehrhovey | 0:a548a085de55 | 472 | * ip.src == llipaddr OR |
| pehrhovey | 0:a548a085de55 | 473 | * ip.dst == llipaddr && hw.src != own hwaddr |
| pehrhovey | 0:a548a085de55 | 474 | */ |
| pehrhovey | 0:a548a085de55 | 475 | if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) || |
| pehrhovey | 0:a548a085de55 | 476 | (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) && |
| pehrhovey | 0:a548a085de55 | 477 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) { |
| pehrhovey | 0:a548a085de55 | 478 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
| pehrhovey | 0:a548a085de55 | 479 | ("autoip_arp_reply(): Probe Conflict detected\n")); |
| pehrhovey | 0:a548a085de55 | 480 | autoip_start(netif); |
| pehrhovey | 0:a548a085de55 | 481 | } |
| pehrhovey | 0:a548a085de55 | 482 | } else { |
| pehrhovey | 0:a548a085de55 | 483 | /* RFC 3927 Section 2.5: |
| pehrhovey | 0:a548a085de55 | 484 | * in any state we have a conflict if |
| pehrhovey | 0:a548a085de55 | 485 | * ip.src == llipaddr && hw.src != own hwaddr |
| pehrhovey | 0:a548a085de55 | 486 | */ |
| pehrhovey | 0:a548a085de55 | 487 | if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) && |
| pehrhovey | 0:a548a085de55 | 488 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) { |
| pehrhovey | 0:a548a085de55 | 489 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, |
| pehrhovey | 0:a548a085de55 | 490 | ("autoip_arp_reply(): Conflicting ARP-Packet detected\n")); |
| pehrhovey | 0:a548a085de55 | 491 | autoip_handle_arp_conflict(netif); |
| pehrhovey | 0:a548a085de55 | 492 | } |
| pehrhovey | 0:a548a085de55 | 493 | } |
| pehrhovey | 0:a548a085de55 | 494 | } |
| pehrhovey | 0:a548a085de55 | 495 | } |
| pehrhovey | 0:a548a085de55 | 496 | |
| pehrhovey | 0:a548a085de55 | 497 | #endif /* LWIP_AUTOIP */ |