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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP_130/] [src/] [core/] [ipv4/] [autoip.c] - Blame information for rev 606

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/**
 * @file
 * AutoIP Automatic LinkLocal IP Configuration
 *
 */
 
/*
 *
 * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Dominik Spies <kontakt@dspies.de>
 *
 * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
 * with RFC 3927.
 *
 *
 * Please coordinate changes and requests with Dominik Spies
 * <kontakt@dspies.de>
 */
 
/*******************************************************************************
 * USAGE:
 *
 * define LWIP_AUTOIP 1  in your lwipopts.h
 *
 * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
 * - First, call autoip_init().
 * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
 *   that should be defined in autoip.h.
 *   I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
 *   Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
 *
 * Without DHCP:
 * - Call autoip_start() after netif_add().
 *
 * With DHCP:
 * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
 * - Configure your DHCP Client.
 *
 */
 
#include "lwip/opt.h"
 
#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
 
#include "lwip/mem.h"
#include "lwip/udp.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/autoip.h"
#include "netif/etharp.h"
 
#include <stdlib.h>
#include <string.h>
 
/* Pseudo random macro based on netif informations.
 * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
#ifndef LWIP_AUTOIP_RAND
#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
                                   ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
                                   ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
                                   ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
                                   (netif->autoip?netif->autoip->tried_llipaddr:0))
#endif /* LWIP_AUTOIP_RAND */
 
/* static functions */
static void autoip_handle_arp_conflict(struct netif *netif);
 
/* creates random LL IP-Address for a network interface */
static void autoip_create_rand_addr(struct netif *netif, struct ip_addr *RandomIPAddr);
 
/* sends an ARP announce */
static err_t autoip_arp_announce(struct netif *netif);
 
/* configure interface for use with current LL IP-Address */
static err_t autoip_bind(struct netif *netif);
 
/**
 * Initialize this module
 */
void
autoip_init(void)
{
  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n"));
}
 
/**
 * Handle a IP address conflict after an ARP conflict detection
 */
static void
autoip_handle_arp_conflict(struct netif *netif)
{
  /* Somehow detect if we are defending or retreating */
  unsigned char defend = 1; /* tbd */
 
  if(defend) {
    if(netif->autoip->lastconflict > 0) {
      /* retreat, there was a conflicting ARP in the last
       * DEFEND_INTERVAL seconds
       */
      LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
        ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
 
      /* TODO: close all TCP sessions */
      autoip_start(netif);
    } else {
      LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
        ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
      autoip_arp_announce(netif);
      netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
    }
  } else {
    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
      ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
    /* TODO: close all TCP sessions */
    autoip_start(netif);
  }
}
 
/**
 * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
 *
 * @param netif network interface on which create the IP-Address
 * @param RandomIPAddr ip address to initialize
 */
static void
autoip_create_rand_addr(struct netif *netif, struct ip_addr *RandomIPAddr)
{
  /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
   * compliant to RFC 3927 Section 2.1
   * We have 254 * 256 possibilities
   */
 
  RandomIPAddr->addr = (0xA9FE0100 + ((u32_t)(((u8_t)(netif->hwaddr[4])) |
    ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)) + netif->autoip->tried_llipaddr);
 
  if (RandomIPAddr->addr>0xA9FEFEFF) {
    RandomIPAddr->addr = (0xA9FE0100 + (RandomIPAddr->addr-0xA9FEFEFF));
  }
  if (RandomIPAddr->addr<0xA9FE0100) {
    RandomIPAddr->addr = (0xA9FEFEFF - (0xA9FE0100-RandomIPAddr->addr));
  }
  RandomIPAddr->addr = htonl(RandomIPAddr->addr);
 
  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
    ("autoip_create_rand_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n",
    (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(RandomIPAddr->addr)));
}
 
/**
 * Sends an ARP announce from a network interface
 *
 * @param netif network interface used to send the announce
 */
static err_t
autoip_arp_announce(struct netif *netif)
{
  return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
    (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
    &netif->autoip->llipaddr, ARP_REQUEST);
}
 
/**
 * Configure interface for use with current LL IP-Address
 *
 * @param netif network interface to configure with current LL IP-Address
 */
static err_t
autoip_bind(struct netif *netif)
{
  struct autoip *autoip = netif->autoip;
  struct ip_addr sn_mask, gw_addr;
 
  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
    ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n",
    (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr));
 
  IP4_ADDR(&sn_mask, 255, 255, 0, 0);
  IP4_ADDR(&gw_addr, 0, 0, 0, 0);
 
  netif_set_ipaddr(netif, &autoip->llipaddr);
  netif_set_netmask(netif, &sn_mask);
  netif_set_gw(netif, &gw_addr);
 
  /* bring the interface up */
  netif_set_up(netif);
 
  return ERR_OK;
}
 
/**
 * Start AutoIP client
 *
 * @param netif network interface on which start the AutoIP client
 */
err_t
autoip_start(struct netif *netif)
{
  struct autoip *autoip = netif->autoip;
  err_t result = ERR_OK;
 
  if(netif_is_up(netif)) {
    netif_set_down(netif);
  }
 
  /* Set IP-Address, Netmask and Gateway to 0 to make sure that
   * ARP Packets are formed correctly
   */
  netif->ip_addr.addr = 0;
  netif->netmask.addr = 0;
  netif->gw.addr      = 0;
 
  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
    ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
    netif->name[1], (u16_t)netif->num));
  if(autoip == NULL) {
    /* no AutoIP client attached yet? */
    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
      ("autoip_start(): starting new AUTOIP client\n"));
    autoip = mem_malloc(sizeof(struct autoip));
    if(autoip == NULL) {
      LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
        ("autoip_start(): could not allocate autoip\n"));
      return ERR_MEM;
    }
    memset( autoip, 0, sizeof(struct autoip));
    /* store this AutoIP client in the netif */
    netif->autoip = autoip;
    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
  } else {
    autoip->state = AUTOIP_STATE_OFF;
    autoip->ttw = 0;
    autoip->sent_num = 0;
    memset(&autoip->llipaddr, 0, sizeof(struct ip_addr));
    autoip->lastconflict = 0;
  }
 
  autoip_create_rand_addr(netif, &(autoip->llipaddr));
  autoip->tried_llipaddr++;
  autoip->state = AUTOIP_STATE_PROBING;
  autoip->sent_num = 0;
 
  /* time to wait to first probe, this is randomly
   * choosen out of 0 to PROBE_WAIT seconds.
   * compliant to RFC 3927 Section 2.2.1
   */
  autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
 
  /*
   * if we tried more then MAX_CONFLICTS we must limit our rate for
   * accquiring and probing address
   * compliant to RFC 3927 Section 2.2.1
   */
 
  if(autoip->tried_llipaddr > MAX_CONFLICTS) {
    autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
  }
 
  return result;
}
 
/**
 * Stop AutoIP client
 *
 * @param netif network interface on which stop the AutoIP client
 */
err_t
autoip_stop(struct netif *netif)
{
  netif->autoip->state = AUTOIP_STATE_OFF;
  netif_set_down(netif);
  return ERR_OK;
}
 
/**
 * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
 */
void
autoip_tmr()
{
  struct netif *netif = netif_list;
  /* loop through netif's */
  while (netif != NULL) {
    /* only act on AutoIP configured interfaces */
    if (netif->autoip != NULL) {
      if(netif->autoip->lastconflict > 0) {
        netif->autoip->lastconflict--;
      }
 
      LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
        ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
        (u16_t)(netif->autoip->state), netif->autoip->ttw));
 
      switch(netif->autoip->state) {
        case AUTOIP_STATE_PROBING:
          if(netif->autoip->ttw > 0) {
            netif->autoip->ttw--;
          } else {
            if(netif->autoip->sent_num == PROBE_NUM) {
              netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
              netif->autoip->sent_num = 0;
              netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
            } else {
              etharp_request(netif, &(netif->autoip->llipaddr));
              LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
                ("autoip_tmr() PROBING Sent Probe\n"));
              netif->autoip->sent_num++;
              /* calculate time to wait to next probe */
              netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
                ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
                PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
            }
          }
          break;
 
        case AUTOIP_STATE_ANNOUNCING:
          if(netif->autoip->ttw > 0) {
            netif->autoip->ttw--;
          } else {
            if(netif->autoip->sent_num == 0) {
             /* 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(netif);
            }
 
            if(netif->autoip->sent_num == ANNOUNCE_NUM) {
              netif->autoip->state = AUTOIP_STATE_BOUND;
              netif->autoip->sent_num = 0;
              netif->autoip->ttw = 0;
            } else {
              autoip_arp_announce(netif);
              LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
                ("autoip_tmr() ANNOUNCING Sent Announce\n"));
              netif->autoip->sent_num++;
              netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
            }
          }
          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 | 3, ("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
    */
    struct ip_addr sipaddr, dipaddr;
    struct eth_addr netifaddr;
    netifaddr.addr[0] = netif->hwaddr[0];
    netifaddr.addr[1] = netif->hwaddr[1];
    netifaddr.addr[2] = netif->hwaddr[2];
    netifaddr.addr[3] = netif->hwaddr[3];
    netifaddr.addr[4] = netif->hwaddr[4];
    netifaddr.addr[5] = netif->hwaddr[5];
 
    /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
     * structure packing (not using structure copy which breaks strict-aliasing rules).
     */
    MEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
    MEMCPY(&dipaddr, &hdr->dipaddr, sizeof(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 ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
          (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
           !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
        LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
          ("autoip_arp_reply(): Probe Conflict detected\n"));
        autoip_start(netif);
      }
    } else {
     /* RFC 3927 Section 2.5:
      * in any state we have a conflict if
      * ip.src == llipaddr && hw.src != own hwaddr
      */
      if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
          !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
        LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
          ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
        autoip_handle_arp_conflict(netif);
      }
    }
  }
}
 
#endif /* LWIP_AUTOIP */

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Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP_130/] [src/] [core/] [ipv4/] [autoip.c] - Blame information for rev 606

Line No.	Rev	Author	Line
1	606	jeremybenn	`/**`
2			`* @file`
3			`* AutoIP Automatic LinkLocal IP Configuration`
4			`*`
5			`*/`
6
7			`/*`
8			`*`
9			`* Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>`
10			`* All rights reserved.`
11			`*`
12			`* Redistribution and use in source and binary forms, with or without modification,`
13			`* are permitted provided that the following conditions are met:`
14			`*`
15			`* 1. Redistributions of source code must retain the above copyright notice,`
16			`* this list of conditions and the following disclaimer.`
17			`* 2. Redistributions in binary form must reproduce the above copyright notice,`
18			`* this list of conditions and the following disclaimer in the documentation`
19			`* and/or other materials provided with the distribution.`
20			`* 3. The name of the author may not be used to endorse or promote products`
21			`* derived from this software without specific prior written permission.`
22			`*`
23			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
24			`* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF`
25			`* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT`
26			`* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,`
27			`* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT`
28			`* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS`
29			`* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN`
30			`* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING`
31			`* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY`
32			`* OF SUCH DAMAGE.`
33			`*`
34			`* Author: Dominik Spies <kontakt@dspies.de>`
35			`*`
36			`* This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform`
37			`* with RFC 3927.`
38			`*`
39			`*`
40			`* Please coordinate changes and requests with Dominik Spies`
41			`* <kontakt@dspies.de>`
42			`*/`
43
44			`/*******************************************************************************`
45			`* USAGE:`
46			`*`
47			`* define LWIP_AUTOIP 1 in your lwipopts.h`
48			`*`
49			`* If you don't use tcpip.c (so, don't call, you don't call tcpip_init):`
50			`* - First, call autoip_init().`
51			`* - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,`
52			`* that should be defined in autoip.h.`
53			`* I recommend a value of 100. The value must divide 1000 with a remainder almost 0.`
54			`* Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....`
55			`*`
56			`* Without DHCP:`
57			`* - Call autoip_start() after netif_add().`
58			`*`
59			`* With DHCP:`
60			`* - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.`
61			`* - Configure your DHCP Client.`
62			`*`
63			`*/`
64
65			`#include "lwip/opt.h"`
66
67			`#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */`
68
69			`#include "lwip/mem.h"`
70			`#include "lwip/udp.h"`
71			`#include "lwip/ip_addr.h"`
72			`#include "lwip/netif.h"`
73			`#include "lwip/autoip.h"`
74			`#include "netif/etharp.h"`
75
76			`#include <stdlib.h>`
77			`#include <string.h>`
78
79			`/* Pseudo random macro based on netif informations.`
80			`* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */`
81			`#ifndef LWIP_AUTOIP_RAND`
82			`#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) \| \`
83			`((u32_t)((netif->hwaddr[3]) & 0xff) << 16) \| \`
84			`((u32_t)((netif->hwaddr[2]) & 0xff) << 8) \| \`
85			`((u32_t)((netif->hwaddr[4]) & 0xff))) + \`
86			`(netif->autoip?netif->autoip->tried_llipaddr:0))`
87			`#endif /* LWIP_AUTOIP_RAND */`
88
89			`/* static functions */`
90			`static void autoip_handle_arp_conflict(struct netif *netif);`
91
92			`/* creates random LL IP-Address for a network interface */`
93			`static void autoip_create_rand_addr(struct netif netif, struct ip_addr RandomIPAddr);`
94
95			`/* sends an ARP announce */`
96			`static err_t autoip_arp_announce(struct netif *netif);`
97
98			`/* configure interface for use with current LL IP-Address */`
99			`static err_t autoip_bind(struct netif *netif);`
100
101			`/**`
102			`* Initialize this module`
103			`*/`
104			`void`
105			`autoip_init(void)`
106			`{`
107			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| 3, ("autoip_init()\n"));`
108			`}`
109
110			`/**`
111			`* Handle a IP address conflict after an ARP conflict detection`
112			`*/`
113			`static void`
114			`autoip_handle_arp_conflict(struct netif *netif)`
115			`{`
116			`/* Somehow detect if we are defending or retreating */`
117			`unsigned char defend = 1; /* tbd */`
118
119			`if(defend) {`
120			`if(netif->autoip->lastconflict > 0) {`
121			`/* retreat, there was a conflicting ARP in the last`
122			`* DEFEND_INTERVAL seconds`
123			`*/`
124			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| 1,`
125			`("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));`
126
127			`/* TODO: close all TCP sessions */`
128			`autoip_start(netif);`
129			`} else {`
130			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| 1,`
131			`("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));`
132			`autoip_arp_announce(netif);`
133			`netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;`
134			`}`
135			`} else {`
136			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| 1,`
137			`("autoip_handle_arp_conflict(): we do not defend, retreating\n"));`
138			`/* TODO: close all TCP sessions */`
139			`autoip_start(netif);`
140			`}`
141			`}`
142
143			`/**`
144			`* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255`
145			`*`
146			`* @param netif network interface on which create the IP-Address`
147			`* @param RandomIPAddr ip address to initialize`
148			`*/`
149			`static void`
150			`autoip_create_rand_addr(struct netif netif, struct ip_addr RandomIPAddr)`
151			`{`
152			`/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255`
153			`* compliant to RFC 3927 Section 2.1`
154			`* We have 254 * 256 possibilities`
155			`*/`
156
157			`RandomIPAddr->addr = (0xA9FE0100 + ((u32_t)(((u8_t)(netif->hwaddr[4])) \|`
158			`((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)) + netif->autoip->tried_llipaddr);`
159
160			`if (RandomIPAddr->addr>0xA9FEFEFF) {`
161			`RandomIPAddr->addr = (0xA9FE0100 + (RandomIPAddr->addr-0xA9FEFEFF));`
162			`}`
163			`if (RandomIPAddr->addr<0xA9FE0100) {`
164			`RandomIPAddr->addr = (0xA9FEFEFF - (0xA9FE0100-RandomIPAddr->addr));`
165			`}`
166			`RandomIPAddr->addr = htonl(RandomIPAddr->addr);`
167
168			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| 1,`
169			`("autoip_create_rand_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n",`
170			`(u16_t)(netif->autoip->tried_llipaddr), (u32_t)(RandomIPAddr->addr)));`
171			`}`
172
173			`/**`
174			`* Sends an ARP announce from a network interface`
175			`*`
176			`* @param netif network interface used to send the announce`
177			`*/`
178			`static err_t`
179			`autoip_arp_announce(struct netif *netif)`
180			`{`
181			`return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,`
182			`(struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,`
183			`&netif->autoip->llipaddr, ARP_REQUEST);`
184			`}`
185
186			`/**`
187			`* Configure interface for use with current LL IP-Address`
188			`*`
189			`* @param netif network interface to configure with current LL IP-Address`
190			`*/`
191			`static err_t`
192			`autoip_bind(struct netif *netif)`
193			`{`
194			`struct autoip *autoip = netif->autoip;`
195			`struct ip_addr sn_mask, gw_addr;`
196
197			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| 3,`
198			`("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n",`
199			`(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr));`
200
201			`IP4_ADDR(&sn_mask, 255, 255, 0, 0);`
202			`IP4_ADDR(&gw_addr, 0, 0, 0, 0);`
203
204			`netif_set_ipaddr(netif, &autoip->llipaddr);`
205			`netif_set_netmask(netif, &sn_mask);`
206			`netif_set_gw(netif, &gw_addr);`
207
208			`/* bring the interface up */`
209			`netif_set_up(netif);`
210
211			`return ERR_OK;`
212			`}`
213
214			`/**`
215			`* Start AutoIP client`
216			`*`
217			`* @param netif network interface on which start the AutoIP client`
218			`*/`
219			`err_t`
220			`autoip_start(struct netif *netif)`
221			`{`
222			`struct autoip *autoip = netif->autoip;`
223			`err_t result = ERR_OK;`
224
225			`if(netif_is_up(netif)) {`
226			`netif_set_down(netif);`
227			`}`
228
229			`/* Set IP-Address, Netmask and Gateway to 0 to make sure that`
230			`* ARP Packets are formed correctly`
231			`*/`
232			`netif->ip_addr.addr = 0;`
233			`netif->netmask.addr = 0;`
234			`netif->gw.addr = 0;`
235
236			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,`
237			`("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],`
238			`netif->name[1], (u16_t)netif->num));`
239			`if(autoip == NULL) {`
240			`/* no AutoIP client attached yet? */`
241			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,`
242			`("autoip_start(): starting new AUTOIP client\n"));`
243			`autoip = mem_malloc(sizeof(struct autoip));`
244			`if(autoip == NULL) {`
245			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,`
246			`("autoip_start(): could not allocate autoip\n"));`
247			`return ERR_MEM;`
248			`}`
249			`memset( autoip, 0, sizeof(struct autoip));`
250			`/* store this AutoIP client in the netif */`
251			`netif->autoip = autoip;`
252			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));`
253			`} else {`
254			`autoip->state = AUTOIP_STATE_OFF;`
255			`autoip->ttw = 0;`
256			`autoip->sent_num = 0;`
257			`memset(&autoip->llipaddr, 0, sizeof(struct ip_addr));`
258			`autoip->lastconflict = 0;`
259			`}`
260
261			`autoip_create_rand_addr(netif, &(autoip->llipaddr));`
262			`autoip->tried_llipaddr++;`
263			`autoip->state = AUTOIP_STATE_PROBING;`
264			`autoip->sent_num = 0;`
265
266			`/* time to wait to first probe, this is randomly`
267			`* choosen out of 0 to PROBE_WAIT seconds.`
268			`* compliant to RFC 3927 Section 2.2.1`
269			`*/`
270			`autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));`
271
272			`/*`
273			`* if we tried more then MAX_CONFLICTS we must limit our rate for`
274			`* accquiring and probing address`
275			`* compliant to RFC 3927 Section 2.2.1`
276			`*/`
277
278			`if(autoip->tried_llipaddr > MAX_CONFLICTS) {`
279			`autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;`
280			`}`
281
282			`return result;`
283			`}`
284
285			`/**`
286			`* Stop AutoIP client`
287			`*`
288			`* @param netif network interface on which stop the AutoIP client`
289			`*/`
290			`err_t`
291			`autoip_stop(struct netif *netif)`
292			`{`
293			`netif->autoip->state = AUTOIP_STATE_OFF;`
294			`netif_set_down(netif);`
295			`return ERR_OK;`
296			`}`
297
298			`/**`
299			`* Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds`
300			`*/`
301			`void`
302			`autoip_tmr()`
303			`{`
304			`struct netif *netif = netif_list;`
305			`/* loop through netif's */`
306			`while (netif != NULL) {`
307			`/* only act on AutoIP configured interfaces */`
308			`if (netif->autoip != NULL) {`
309			`if(netif->autoip->lastconflict > 0) {`
310			`netif->autoip->lastconflict--;`
311			`}`
312
313			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE,`
314			`("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",`
315			`(u16_t)(netif->autoip->state), netif->autoip->ttw));`
316
317			`switch(netif->autoip->state) {`
318			`case AUTOIP_STATE_PROBING:`
319			`if(netif->autoip->ttw > 0) {`
320			`netif->autoip->ttw--;`
321			`} else {`
322			`if(netif->autoip->sent_num == PROBE_NUM) {`
323			`netif->autoip->state = AUTOIP_STATE_ANNOUNCING;`
324			`netif->autoip->sent_num = 0;`
325			`netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;`
326			`} else {`
327			`etharp_request(netif, &(netif->autoip->llipaddr));`
328			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| 3,`
329			`("autoip_tmr() PROBING Sent Probe\n"));`
330			`netif->autoip->sent_num++;`
331			`/* calculate time to wait to next probe */`
332			`netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %`
333			`((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +`
334			`PROBE_MIN * AUTOIP_TICKS_PER_SECOND);`
335			`}`
336			`}`
337			`break;`
338
339			`case AUTOIP_STATE_ANNOUNCING:`
340			`if(netif->autoip->ttw > 0) {`
341			`netif->autoip->ttw--;`
342			`} else {`
343			`if(netif->autoip->sent_num == 0) {`
344			`/* We are here the first time, so we waited ANNOUNCE_WAIT seconds`
345			`* Now we can bind to an IP address and use it`
346			`*/`
347			`autoip_bind(netif);`
348			`}`
349
350			`if(netif->autoip->sent_num == ANNOUNCE_NUM) {`
351			`netif->autoip->state = AUTOIP_STATE_BOUND;`
352			`netif->autoip->sent_num = 0;`
353			`netif->autoip->ttw = 0;`
354			`} else {`
355			`autoip_arp_announce(netif);`
356			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| 3,`
357			`("autoip_tmr() ANNOUNCING Sent Announce\n"));`
358			`netif->autoip->sent_num++;`
359			`netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;`
360			`}`
361			`}`
362			`break;`
363			`}`
364			`}`
365			`/* proceed to next network interface */`
366			`netif = netif->next;`
367			`}`
368			`}`
369
370			`/**`
371			`* Handles every incoming ARP Packet, called by etharp_arp_input.`
372			`*`
373			`* @param netif network interface to use for autoip processing`
374			`* @param hdr Incoming ARP packet`
375			`*/`
376			`void`
377			`autoip_arp_reply(struct netif netif, struct etharp_hdr hdr)`
378			`{`
379			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| 3, ("autoip_arp_reply()\n"));`
380			`if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {`
381			`/* when ip.src == llipaddr && hw.src != netif->hwaddr`
382			`*`
383			`* when probing ip.dst == llipaddr && hw.src != netif->hwaddr`
384			`* we have a conflict and must solve it`
385			`*/`
386			`struct ip_addr sipaddr, dipaddr;`
387			`struct eth_addr netifaddr;`
388			`netifaddr.addr[0] = netif->hwaddr[0];`
389			`netifaddr.addr[1] = netif->hwaddr[1];`
390			`netifaddr.addr[2] = netif->hwaddr[2];`
391			`netifaddr.addr[3] = netif->hwaddr[3];`
392			`netifaddr.addr[4] = netif->hwaddr[4];`
393			`netifaddr.addr[5] = netif->hwaddr[5];`
394
395			`/* Copy struct ip_addr2 to aligned ip_addr, to support compilers without`
396			`* structure packing (not using structure copy which breaks strict-aliasing rules).`
397			`*/`
398			`MEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));`
399			`MEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));`
400
401			`if ((netif->autoip->state == AUTOIP_STATE_PROBING) \|\|`
402			`((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&`
403			`(netif->autoip->sent_num == 0))) {`
404			`/* RFC 3927 Section 2.2.1:`
405			`* from beginning to after ANNOUNCE_WAIT`
406			`* seconds we have a conflict if`
407			`* ip.src == llipaddr OR`
408			`* ip.dst == llipaddr && hw.src != own hwaddr`
409			`*/`
410			`if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) \|\|`
411			`(ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&`
412			`!eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {`
413			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| 1,`
414			`("autoip_arp_reply(): Probe Conflict detected\n"));`
415			`autoip_start(netif);`
416			`}`
417			`} else {`
418			`/* RFC 3927 Section 2.5:`
419			`* in any state we have a conflict if`
420			`* ip.src == llipaddr && hw.src != own hwaddr`
421			`*/`
422			`if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&`
423			`!eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {`
424			`LWIP_DEBUGF(AUTOIP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE \| 1,`
425			`("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));`
426			`autoip_handle_arp_conflict(netif);`
427			`}`
428			`}`
429			`}`
430			`}`
431
432			`#endif /* LWIP_AUTOIP */`