553 lines
18 KiB
C
Executable file
553 lines
18 KiB
C
Executable file
/**
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* @file
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* AutoIP Automatic LinkLocal IP Configuration
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*
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*/
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/*
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*
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* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Dominik Spies <kontakt@dspies.de>
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*
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* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
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* with RFC 3927.
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*
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*
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* Please coordinate changes and requests with Dominik Spies
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* <kontakt@dspies.de>
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*/
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/*******************************************************************************
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* USAGE:
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*
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* define LWIP_AUTOIP 1 in your lwipopts.h
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*
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* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
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* - First, call autoip_init().
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* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
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* that should be defined in autoip.h.
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* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
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* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
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*
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* Without DHCP:
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* - Call autoip_start() after netif_add().
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*
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* With DHCP:
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* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
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* - Configure your DHCP Client.
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_IPV4 && LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/mem.h"
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/* #include "lwip/udp.h" */
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/autoip.h"
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#include "netif/etharp.h"
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#include "lwip/dhcp.h"
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#include <stdlib.h>
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#include <string.h>
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/* 169.254.0.0 */
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#define AUTOIP_NET 0xA9FE0000
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/* 169.254.1.0 */
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#define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
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/* 169.254.254.255 */
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#define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
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/** Pseudo random macro based on netif informations.
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* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
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#ifndef LWIP_AUTOIP_RAND
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#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
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((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
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((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
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((u32_t)((netif->hwaddr[4]) & 0xff))) + \
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(netif->autoip?netif->autoip->tried_llipaddr:0))
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#endif /* LWIP_AUTOIP_RAND */
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/**
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* Macro that generates the initial IP address to be tried by AUTOIP.
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* If you want to override this, define it to something else in lwipopts.h.
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*/
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#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
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#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
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htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
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((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
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#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
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/* static functions */
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static void autoip_handle_arp_conflict(struct netif *netif);
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/* creates a pseudo random LL IP-Address for a network interface */
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static void autoip_create_addr(struct netif *netif, ip4_addr_t *ipaddr);
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/* sends an ARP probe */
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static err_t autoip_arp_probe(struct netif *netif);
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/* sends an ARP announce */
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static err_t autoip_arp_announce(struct netif *netif);
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/* configure interface for use with current LL IP-Address */
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static err_t autoip_bind(struct netif *netif);
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/* start sending probes for llipaddr */
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static void autoip_start_probing(struct netif *netif);
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/** Set a statically allocated struct autoip to work with.
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* Using this prevents autoip_start to allocate it using mem_malloc.
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*
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* @param netif the netif for which to set the struct autoip
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* @param dhcp (uninitialised) dhcp struct allocated by the application
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*/
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void
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autoip_set_struct(struct netif *netif, struct autoip *autoip)
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{
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LWIP_ASSERT("netif != NULL", netif != NULL);
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LWIP_ASSERT("autoip != NULL", autoip != NULL);
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LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
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/* clear data structure */
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memset(autoip, 0, sizeof(struct autoip));
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/* autoip->state = AUTOIP_STATE_OFF; */
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netif->autoip = autoip;
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}
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/** Restart AutoIP client and check the next address (conflict detected)
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*
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* @param netif The netif under AutoIP control
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*/
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static void
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autoip_restart(struct netif *netif)
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{
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netif->autoip->tried_llipaddr++;
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autoip_start(netif);
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}
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/**
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* Handle a IP address conflict after an ARP conflict detection
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*/
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static void
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autoip_handle_arp_conflict(struct netif *netif)
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{
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/* Somehow detect if we are defending or retreating */
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unsigned char defend = 1; /* tbd */
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if (defend) {
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if (netif->autoip->lastconflict > 0) {
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/* retreat, there was a conflicting ARP in the last
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* DEFEND_INTERVAL seconds
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*/
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
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/* TODO: close all TCP sessions */
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autoip_restart(netif);
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} else {
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
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autoip_arp_announce(netif);
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netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
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}
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} else {
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
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/* TODO: close all TCP sessions */
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autoip_restart(netif);
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}
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}
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/**
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* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
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*
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* @param netif network interface on which create the IP-Address
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* @param ipaddr ip address to initialize
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*/
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static void
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autoip_create_addr(struct netif *netif, ip4_addr_t *ipaddr)
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{
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/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
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* compliant to RFC 3927 Section 2.1
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* We have 254 * 256 possibilities */
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u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
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addr += netif->autoip->tried_llipaddr;
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addr = AUTOIP_NET | (addr & 0xffff);
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/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
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if (addr < AUTOIP_RANGE_START) {
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addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
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}
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if (addr > AUTOIP_RANGE_END) {
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addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
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}
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LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
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(addr <= AUTOIP_RANGE_END));
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ip4_addr_set_u32(ipaddr, htonl(addr));
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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(u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
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ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
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}
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/**
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* Sends an ARP probe from a network interface
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*
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* @param netif network interface used to send the probe
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*/
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static err_t
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autoip_arp_probe(struct netif *netif)
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{
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return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
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(struct eth_addr *)netif->hwaddr, IP4_ADDR_ANY, ðzero,
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&netif->autoip->llipaddr, ARP_REQUEST);
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}
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/**
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* Sends an ARP announce from a network interface
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*
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* @param netif network interface used to send the announce
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*/
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static err_t
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autoip_arp_announce(struct netif *netif)
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{
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return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
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(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero,
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&netif->autoip->llipaddr, ARP_REQUEST);
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}
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/**
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* Configure interface for use with current LL IP-Address
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*
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* @param netif network interface to configure with current LL IP-Address
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*/
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static err_t
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autoip_bind(struct netif *netif)
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{
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struct autoip *autoip = netif->autoip;
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ip4_addr_t sn_mask, gw_addr;
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
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ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
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ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
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IP4_ADDR(&sn_mask, 255, 255, 0, 0);
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IP4_ADDR(&gw_addr, 0, 0, 0, 0);
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netif_set_addr(netif, &autoip->llipaddr, &sn_mask, &gw_addr);
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/* interface is used by routing now that an address is set */
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#if ESP_LWIP
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struct dhcp *dhcp = netif->dhcp;
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if (dhcp->cb != NULL) {
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dhcp->cb(netif);
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}
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#endif
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return ERR_OK;
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}
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/**
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* Start AutoIP client
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*
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* @param netif network interface on which start the AutoIP client
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*/
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err_t
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autoip_start(struct netif *netif)
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{
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struct autoip *autoip = netif->autoip;
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err_t result = ERR_OK;
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LWIP_ERROR("netif is not up, old style port?", netif_is_up(netif), return ERR_ARG;);
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/* Set IP-Address, Netmask and Gateway to 0 to make sure that
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* ARP Packets are formed correctly
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*/
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netif_set_addr(netif, IP4_ADDR_ANY, IP4_ADDR_ANY, IP4_ADDR_ANY);
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
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netif->name[1], (u16_t)netif->num));
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if (autoip == NULL) {
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/* no AutoIP client attached yet? */
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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("autoip_start(): starting new AUTOIP client\n"));
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autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
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if (autoip == NULL) {
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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("autoip_start(): could not allocate autoip\n"));
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return ERR_MEM;
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}
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memset(autoip, 0, sizeof(struct autoip));
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/* store this AutoIP client in the netif */
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netif->autoip = autoip;
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
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} else {
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autoip->state = AUTOIP_STATE_OFF;
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autoip->ttw = 0;
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autoip->sent_num = 0;
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ip4_addr_set_zero(&autoip->llipaddr);
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autoip->lastconflict = 0;
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}
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autoip_create_addr(netif, &(autoip->llipaddr));
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autoip_start_probing(netif);
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return result;
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}
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static void
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autoip_start_probing(struct netif *netif)
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{
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struct autoip *autoip = netif->autoip;
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autoip->state = AUTOIP_STATE_PROBING;
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autoip->sent_num = 0;
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
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ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
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/* time to wait to first probe, this is randomly
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* chosen out of 0 to PROBE_WAIT seconds.
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* compliant to RFC 3927 Section 2.2.1
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*/
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autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
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/*
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* if we tried more then MAX_CONFLICTS we must limit our rate for
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* acquiring and probing address
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* compliant to RFC 3927 Section 2.2.1
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*/
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if (autoip->tried_llipaddr > MAX_CONFLICTS) {
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autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
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}
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}
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/**
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* Handle a possible change in the network configuration.
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*
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* If there is an AutoIP address configured, take the interface down
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* and begin probing with the same address.
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*/
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void
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autoip_network_changed(struct netif *netif)
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{
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if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
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autoip_start_probing(netif);
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}
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}
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/**
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* Stop AutoIP client
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*
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* @param netif network interface on which stop the AutoIP client
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*/
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err_t
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autoip_stop(struct netif *netif)
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{
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if (netif->autoip) {
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netif->autoip->state = AUTOIP_STATE_OFF;
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if (ip4_addr_islinklocal(netif_ip4_addr(netif))) {
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netif_set_addr(netif, IP4_ADDR_ANY, IP4_ADDR_ANY, IP4_ADDR_ANY);
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}
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mem_free(netif->autoip);
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netif->autoip = NULL;
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}
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return ERR_OK;
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}
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/**
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* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
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*/
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void
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autoip_tmr(void)
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{
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struct netif *netif = netif_list;
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/* loop through netif's */
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while (netif != NULL) {
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/* only act on AutoIP configured interfaces */
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if (netif->autoip != NULL) {
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if (netif->autoip->lastconflict > 0) {
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netif->autoip->lastconflict--;
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}
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
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(u16_t)(netif->autoip->state), netif->autoip->ttw));
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switch(netif->autoip->state) {
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case AUTOIP_STATE_PROBING:
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if (netif->autoip->ttw > 0) {
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netif->autoip->ttw--;
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} else {
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if (netif->autoip->sent_num >= PROBE_NUM) {
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netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
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netif->autoip->sent_num = 0;
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netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
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ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
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} else {
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autoip_arp_probe(netif);
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LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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("autoip_tmr() PROBING Sent Probe\n"));
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netif->autoip->sent_num++;
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/* calculate time to wait to next probe */
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netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
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((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
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PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
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}
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}
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break;
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case AUTOIP_STATE_ANNOUNCING:
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if (netif->autoip->ttw > 0) {
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netif->autoip->ttw--;
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} else {
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if (netif->autoip->sent_num == 0) {
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/* We are here the first time, so we waited ANNOUNCE_WAIT seconds
|
|
* Now we can bind to an IP address and use it.
|
|
*
|
|
* autoip_bind calls netif_set_addr. This triggers a gratuitous ARP
|
|
* which counts as an announcement.
|
|
*/
|
|
autoip_bind(netif);
|
|
} else {
|
|
autoip_arp_announce(netif);
|
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
|
|
("autoip_tmr() ANNOUNCING Sent Announce\n"));
|
|
}
|
|
netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
|
|
netif->autoip->sent_num++;
|
|
|
|
if (netif->autoip->sent_num >= ANNOUNCE_NUM) {
|
|
netif->autoip->state = AUTOIP_STATE_BOUND;
|
|
netif->autoip->sent_num = 0;
|
|
netif->autoip->ttw = 0;
|
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
|
("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
|
ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
|
|
ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* nothing to do in other states */
|
|
break;
|
|
}
|
|
}
|
|
/* proceed to next network interface */
|
|
netif = netif->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles every incoming ARP Packet, called by etharp_arp_input.
|
|
*
|
|
* @param netif network interface to use for autoip processing
|
|
* @param hdr Incoming ARP packet
|
|
*/
|
|
void
|
|
autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
|
|
{
|
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
|
|
if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
|
|
/* when ip.src == llipaddr && hw.src != netif->hwaddr
|
|
*
|
|
* when probing ip.dst == llipaddr && hw.src != netif->hwaddr
|
|
* we have a conflict and must solve it
|
|
*/
|
|
ip4_addr_t sipaddr, dipaddr;
|
|
struct eth_addr netifaddr;
|
|
ETHADDR16_COPY(netifaddr.addr, netif->hwaddr);
|
|
|
|
/* Copy struct ip4_addr2 to aligned ip4_addr, to support compilers without
|
|
* structure packing (not using structure copy which breaks strict-aliasing rules).
|
|
*/
|
|
IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
|
|
IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
|
|
|
|
if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
|
|
((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
|
|
(netif->autoip->sent_num == 0))) {
|
|
/* RFC 3927 Section 2.2.1:
|
|
* from beginning to after ANNOUNCE_WAIT
|
|
* seconds we have a conflict if
|
|
* ip.src == llipaddr OR
|
|
* ip.dst == llipaddr && hw.src != own hwaddr
|
|
*/
|
|
if ((ip4_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
|
|
(ip4_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
|
|
!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
|
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
|
("autoip_arp_reply(): Probe Conflict detected\n"));
|
|
autoip_restart(netif);
|
|
}
|
|
} else {
|
|
/* RFC 3927 Section 2.5:
|
|
* in any state we have a conflict if
|
|
* ip.src == llipaddr && hw.src != own hwaddr
|
|
*/
|
|
if (ip4_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
|
|
!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
|
|
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
|
("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
|
|
autoip_handle_arp_conflict(netif);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/** check if AutoIP supplied netif->ip_addr
|
|
*
|
|
* @param netif the netif to check
|
|
* @return 1 if AutoIP supplied netif->ip_addr (state BOUND),
|
|
* 0 otherwise
|
|
*/
|
|
u8_t
|
|
autoip_supplied_address(struct netif *netif)
|
|
{
|
|
if ((netif != NULL) && (netif->autoip != NULL)) {
|
|
if (netif->autoip->state == AUTOIP_STATE_BOUND) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* LWIP_IPV4 && LWIP_AUTOIP */
|