[457] | 1 | /**
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| 2 | * @file
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| 3 | * AutoIP Automatic LinkLocal IP Configuration
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| 4 | *
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| 5 | * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
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| 6 | * with RFC 3927.
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| 7 | *
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| 8 | * @defgroup autoip AUTOIP
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| 9 | * @ingroup ip4
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| 10 | * AUTOIP related functions
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| 11 | * USAGE:
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| 12 | *
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| 13 | * define @ref LWIP_AUTOIP 1 in your lwipopts.h
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| 14 | * Options:
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| 15 | * AUTOIP_TMR_INTERVAL msecs,
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| 16 | * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
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| 17 | * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
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| 18 | *
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| 19 | * Without DHCP:
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| 20 | * - Call autoip_start() after netif_add().
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| 21 | *
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| 22 | * With DHCP:
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| 23 | * - define @ref LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
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| 24 | * - Configure your DHCP Client.
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| 25 | *
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| 26 | * @see netifapi_autoip
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| 27 | */
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| 28 |
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| 29 | /*
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| 30 | *
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| 31 | * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
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| 32 | * All rights reserved.
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| 33 | *
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| 34 | * Redistribution and use in source and binary forms, with or without modification,
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| 35 | * are permitted provided that the following conditions are met:
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| 36 | *
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| 37 | * 1. Redistributions of source code must retain the above copyright notice,
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| 38 | * this list of conditions and the following disclaimer.
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| 39 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 40 | * this list of conditions and the following disclaimer in the documentation
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| 41 | * and/or other materials provided with the distribution.
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| 42 | * 3. The name of the author may not be used to endorse or promote products
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| 43 | * derived from this software without specific prior written permission.
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| 44 | *
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| 45 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 46 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 47 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 48 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 49 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 50 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 51 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 52 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 53 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 54 | * OF SUCH DAMAGE.
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| 55 | *
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| 56 | * Author: Dominik Spies <kontakt@dspies.de>
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| 57 | */
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| 58 |
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| 59 | #include "lwip/opt.h"
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| 60 |
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| 61 | #if LWIP_IPV4 && LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
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| 62 |
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| 63 | #include "lwip/mem.h"
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| 64 | /* #include "lwip/udp.h" */
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| 65 | #include "lwip/ip_addr.h"
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| 66 | #include "lwip/netif.h"
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| 67 | #include "lwip/autoip.h"
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| 68 | #include "lwip/etharp.h"
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| 69 | #include "lwip/prot/autoip.h"
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| 70 |
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| 71 | #include <string.h>
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| 72 |
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| 73 | /** Pseudo random macro based on netif informations.
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| 74 | * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
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| 75 | #ifndef LWIP_AUTOIP_RAND
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| 76 | #define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
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| 77 | ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
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| 78 | ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
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| 79 | ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
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| 80 | (netif_autoip_data(netif)? netif_autoip_data(netif)->tried_llipaddr : 0))
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| 81 | #endif /* LWIP_AUTOIP_RAND */
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| 82 |
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| 83 | /**
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| 84 | * Macro that generates the initial IP address to be tried by AUTOIP.
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| 85 | * If you want to override this, define it to something else in lwipopts.h.
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| 86 | */
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| 87 | #ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
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| 88 | #define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
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| 89 | lwip_htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
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| 90 | ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
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| 91 | #endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
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| 92 |
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| 93 | /* static functions */
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| 94 | static err_t autoip_arp_announce(struct netif *netif);
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| 95 | static void autoip_start_probing(struct netif *netif);
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| 96 |
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| 97 | /**
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| 98 | * @ingroup autoip
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| 99 | * Set a statically allocated struct autoip to work with.
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| 100 | * Using this prevents autoip_start to allocate it using mem_malloc.
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| 101 | *
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| 102 | * @param netif the netif for which to set the struct autoip
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| 103 | * @param autoip (uninitialised) autoip struct allocated by the application
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| 104 | */
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| 105 | void
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| 106 | autoip_set_struct(struct netif *netif, struct autoip *autoip)
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| 107 | {
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| 108 | LWIP_ASSERT_CORE_LOCKED();
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| 109 | LWIP_ASSERT("netif != NULL", netif != NULL);
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| 110 | LWIP_ASSERT("autoip != NULL", autoip != NULL);
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| 111 | LWIP_ASSERT("netif already has a struct autoip set",
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| 112 | netif_autoip_data(netif) == NULL);
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| 113 |
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| 114 | /* clear data structure */
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| 115 | memset(autoip, 0, sizeof(struct autoip));
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| 116 | /* autoip->state = AUTOIP_STATE_OFF; */
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| 117 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP, autoip);
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| 118 | }
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| 119 |
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| 120 | /** Restart AutoIP client and check the next address (conflict detected)
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| 121 | *
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| 122 | * @param netif The netif under AutoIP control
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| 123 | */
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| 124 | static void
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| 125 | autoip_restart(struct netif *netif)
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| 126 | {
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| 127 | struct autoip *autoip = netif_autoip_data(netif);
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| 128 | autoip->tried_llipaddr++;
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| 129 | autoip_start(netif);
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| 130 | }
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| 131 |
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| 132 | /**
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| 133 | * Handle a IP address conflict after an ARP conflict detection
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| 134 | */
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| 135 | static void
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| 136 | autoip_handle_arp_conflict(struct netif *netif)
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| 137 | {
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| 138 | struct autoip *autoip = netif_autoip_data(netif);
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| 139 |
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| 140 | /* RFC3927, 2.5 "Conflict Detection and Defense" allows two options where
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| 141 | a) means retreat on the first conflict and
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| 142 | b) allows to keep an already configured address when having only one
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| 143 | conflict in 10 seconds
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| 144 | We use option b) since it helps to improve the chance that one of the two
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| 145 | conflicting hosts may be able to retain its address. */
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| 146 |
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| 147 | if (autoip->lastconflict > 0) {
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| 148 | /* retreat, there was a conflicting ARP in the last DEFEND_INTERVAL seconds */
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| 149 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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| 150 | ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
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| 151 |
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| 152 | /* Active TCP sessions are aborted when removing the ip addresss */
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| 153 | autoip_restart(netif);
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| 154 | } else {
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| 155 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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| 156 | ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
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| 157 | autoip_arp_announce(netif);
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| 158 | autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
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| 159 | }
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| 160 | }
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| 161 |
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| 162 | /**
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| 163 | * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
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| 164 | *
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| 165 | * @param netif network interface on which create the IP-Address
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| 166 | * @param ipaddr ip address to initialize
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| 167 | */
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| 168 | static void
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| 169 | autoip_create_addr(struct netif *netif, ip4_addr_t *ipaddr)
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| 170 | {
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| 171 | struct autoip *autoip = netif_autoip_data(netif);
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| 172 |
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| 173 | /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
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| 174 | * compliant to RFC 3927 Section 2.1
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| 175 | * We have 254 * 256 possibilities */
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| 176 |
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| 177 | u32_t addr = lwip_ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
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| 178 | addr += autoip->tried_llipaddr;
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| 179 | addr = AUTOIP_NET | (addr & 0xffff);
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| 180 | /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
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| 181 |
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| 182 | if (addr < AUTOIP_RANGE_START) {
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| 183 | addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
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| 184 | }
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| 185 | if (addr > AUTOIP_RANGE_END) {
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| 186 | addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
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| 187 | }
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| 188 | LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
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| 189 | (addr <= AUTOIP_RANGE_END));
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| 190 | ip4_addr_set_u32(ipaddr, lwip_htonl(addr));
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| 191 |
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| 192 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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| 193 | ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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| 194 | (u16_t)(autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
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| 195 | ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
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| 196 | }
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| 197 |
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| 198 | /**
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| 199 | * Sends an ARP probe from a network interface
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| 200 | *
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| 201 | * @param netif network interface used to send the probe
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| 202 | */
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| 203 | static err_t
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| 204 | autoip_arp_probe(struct netif *netif)
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| 205 | {
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| 206 | struct autoip *autoip = netif_autoip_data(netif);
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| 207 | /* this works because netif->ip_addr is ANY */
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| 208 | return etharp_request(netif, &autoip->llipaddr);
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| 209 | }
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| 210 |
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| 211 | /**
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| 212 | * Sends an ARP announce from a network interface
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| 213 | *
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| 214 | * @param netif network interface used to send the announce
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| 215 | */
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| 216 | static err_t
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| 217 | autoip_arp_announce(struct netif *netif)
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| 218 | {
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| 219 | return etharp_gratuitous(netif);
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| 220 | }
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| 221 |
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| 222 | /**
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| 223 | * Configure interface for use with current LL IP-Address
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| 224 | *
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| 225 | * @param netif network interface to configure with current LL IP-Address
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| 226 | */
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| 227 | static err_t
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| 228 | autoip_bind(struct netif *netif)
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| 229 | {
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| 230 | struct autoip *autoip = netif_autoip_data(netif);
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| 231 | ip4_addr_t sn_mask, gw_addr;
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| 232 |
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| 233 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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| 234 | ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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| 235 | (void *)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
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| 236 | ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
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| 237 | ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
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| 238 |
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| 239 | IP4_ADDR(&sn_mask, 255, 255, 0, 0);
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| 240 | IP4_ADDR(&gw_addr, 0, 0, 0, 0);
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| 241 |
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| 242 | netif_set_addr(netif, &autoip->llipaddr, &sn_mask, &gw_addr);
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| 243 | /* interface is used by routing now that an address is set */
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| 244 |
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| 245 | return ERR_OK;
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| 246 | }
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| 247 |
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| 248 | /**
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| 249 | * @ingroup autoip
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| 250 | * Start AutoIP client
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| 251 | *
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| 252 | * @param netif network interface on which start the AutoIP client
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| 253 | */
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| 254 | err_t
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| 255 | autoip_start(struct netif *netif)
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| 256 | {
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| 257 | struct autoip *autoip = netif_autoip_data(netif);
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| 258 | err_t result = ERR_OK;
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| 259 |
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| 260 | LWIP_ASSERT_CORE_LOCKED();
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| 261 | LWIP_ERROR("netif is not up, old style port?", netif_is_up(netif), return ERR_ARG;);
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| 262 |
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| 263 | /* Set IP-Address, Netmask and Gateway to 0 to make sure that
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| 264 | * ARP Packets are formed correctly
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| 265 | */
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| 266 | netif_set_addr(netif, IP4_ADDR_ANY4, IP4_ADDR_ANY4, IP4_ADDR_ANY4);
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| 267 |
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| 268 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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| 269 | ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void *)netif, netif->name[0],
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| 270 | netif->name[1], (u16_t)netif->num));
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| 271 | if (autoip == NULL) {
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| 272 | /* no AutoIP client attached yet? */
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| 273 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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| 274 | ("autoip_start(): starting new AUTOIP client\n"));
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| 275 | autoip = (struct autoip *)mem_calloc(1, sizeof(struct autoip));
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| 276 | if (autoip == NULL) {
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| 277 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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| 278 | ("autoip_start(): could not allocate autoip\n"));
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| 279 | return ERR_MEM;
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| 280 | }
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| 281 | /* store this AutoIP client in the netif */
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| 282 | netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP, autoip);
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| 283 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
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| 284 | } else {
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| 285 | autoip->state = AUTOIP_STATE_OFF;
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| 286 | autoip->ttw = 0;
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| 287 | autoip->sent_num = 0;
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| 288 | ip4_addr_set_zero(&autoip->llipaddr);
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| 289 | autoip->lastconflict = 0;
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| 290 | }
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| 291 |
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| 292 | autoip_create_addr(netif, &(autoip->llipaddr));
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| 293 | autoip_start_probing(netif);
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| 294 |
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| 295 | return result;
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| 296 | }
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| 297 |
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| 298 | static void
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| 299 | autoip_start_probing(struct netif *netif)
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| 300 | {
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| 301 | struct autoip *autoip = netif_autoip_data(netif);
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| 302 |
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| 303 | autoip->state = AUTOIP_STATE_PROBING;
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| 304 | autoip->sent_num = 0;
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| 305 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
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| 306 | ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
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| 307 | ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
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| 308 | ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
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| 309 |
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| 310 | /* time to wait to first probe, this is randomly
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| 311 | * chosen out of 0 to PROBE_WAIT seconds.
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| 312 | * compliant to RFC 3927 Section 2.2.1
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| 313 | */
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| 314 | autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
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| 315 |
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| 316 | /*
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| 317 | * if we tried more then MAX_CONFLICTS we must limit our rate for
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| 318 | * acquiring and probing address
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| 319 | * compliant to RFC 3927 Section 2.2.1
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| 320 | */
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| 321 | if (autoip->tried_llipaddr > MAX_CONFLICTS) {
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| 322 | autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
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| 323 | }
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| 324 | }
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| 325 |
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| 326 | /**
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| 327 | * Handle a possible change in the network configuration.
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| 328 | *
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| 329 | * If there is an AutoIP address configured, take the interface down
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| 330 | * and begin probing with the same address.
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| 331 | */
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| 332 | void
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| 333 | autoip_network_changed(struct netif *netif)
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| 334 | {
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| 335 | struct autoip *autoip = netif_autoip_data(netif);
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| 336 |
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| 337 | if (autoip && (autoip->state != AUTOIP_STATE_OFF)) {
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| 338 | autoip_start_probing(netif);
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| 339 | }
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| 340 | }
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| 341 |
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| 342 | /**
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| 343 | * @ingroup autoip
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| 344 | * Stop AutoIP client
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| 345 | *
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| 346 | * @param netif network interface on which stop the AutoIP client
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| 347 | */
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| 348 | err_t
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| 349 | autoip_stop(struct netif *netif)
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| 350 | {
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| 351 | struct autoip *autoip = netif_autoip_data(netif);
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| 352 |
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| 353 | LWIP_ASSERT_CORE_LOCKED();
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| 354 | if (autoip != NULL) {
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| 355 | autoip->state = AUTOIP_STATE_OFF;
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| 356 | if (ip4_addr_islinklocal(netif_ip4_addr(netif))) {
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| 357 | netif_set_addr(netif, IP4_ADDR_ANY4, IP4_ADDR_ANY4, IP4_ADDR_ANY4);
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| 358 | }
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| 359 | }
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| 360 | return ERR_OK;
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| 361 | }
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| 362 |
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| 363 | /**
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| 364 | * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
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| 365 | */
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| 366 | void
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| 367 | autoip_tmr(void)
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| 368 | {
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| 369 | struct netif *netif;
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| 370 | /* loop through netif's */
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| 371 | NETIF_FOREACH(netif) {
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| 372 | struct autoip *autoip = netif_autoip_data(netif);
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| 373 | /* only act on AutoIP configured interfaces */
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| 374 | if (autoip != NULL) {
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| 375 | if (autoip->lastconflict > 0) {
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| 376 | autoip->lastconflict--;
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| 377 | }
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| 378 |
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| 379 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
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| 380 | ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
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| 381 | (u16_t)(autoip->state), autoip->ttw));
|
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| 382 |
|
---|
| 383 | if (autoip->ttw > 0) {
|
---|
| 384 | autoip->ttw--;
|
---|
| 385 | }
|
---|
| 386 |
|
---|
| 387 | switch (autoip->state) {
|
---|
| 388 | case AUTOIP_STATE_PROBING:
|
---|
| 389 | if (autoip->ttw == 0) {
|
---|
| 390 | if (autoip->sent_num >= PROBE_NUM) {
|
---|
| 391 | /* Switch to ANNOUNCING: now we can bind to an IP address and use it */
|
---|
| 392 | autoip->state = AUTOIP_STATE_ANNOUNCING;
|
---|
| 393 | autoip_bind(netif);
|
---|
| 394 | /* autoip_bind() calls netif_set_addr(): this triggers a gratuitous ARP
|
---|
| 395 | which counts as an announcement */
|
---|
| 396 | autoip->sent_num = 1;
|
---|
| 397 | autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
|
---|
| 398 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
| 399 | ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
| 400 | ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
|
---|
| 401 | ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
|
---|
| 402 | } else {
|
---|
| 403 | autoip_arp_probe(netif);
|
---|
| 404 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() PROBING Sent Probe\n"));
|
---|
| 405 | autoip->sent_num++;
|
---|
| 406 | if (autoip->sent_num == PROBE_NUM) {
|
---|
| 407 | /* calculate time to wait to for announce */
|
---|
| 408 | autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
|
---|
| 409 | } else {
|
---|
| 410 | /* calculate time to wait to next probe */
|
---|
| 411 | autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
|
---|
| 412 | ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
|
---|
| 413 | PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
|
---|
| 414 | }
|
---|
| 415 | }
|
---|
| 416 | }
|
---|
| 417 | break;
|
---|
| 418 |
|
---|
| 419 | case AUTOIP_STATE_ANNOUNCING:
|
---|
| 420 | if (autoip->ttw == 0) {
|
---|
| 421 | autoip_arp_announce(netif);
|
---|
| 422 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() ANNOUNCING Sent Announce\n"));
|
---|
| 423 | autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
|
---|
| 424 | autoip->sent_num++;
|
---|
| 425 |
|
---|
| 426 | if (autoip->sent_num >= ANNOUNCE_NUM) {
|
---|
| 427 | autoip->state = AUTOIP_STATE_BOUND;
|
---|
| 428 | autoip->sent_num = 0;
|
---|
| 429 | autoip->ttw = 0;
|
---|
| 430 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
|
---|
| 431 | ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
---|
| 432 | ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
|
---|
| 433 | ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
|
---|
| 434 | }
|
---|
| 435 | }
|
---|
| 436 | break;
|
---|
| 437 |
|
---|
| 438 | default:
|
---|
| 439 | /* nothing to do in other states */
|
---|
| 440 | break;
|
---|
| 441 | }
|
---|
| 442 | }
|
---|
| 443 | }
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 | /**
|
---|
| 447 | * Handles every incoming ARP Packet, called by etharp_input().
|
---|
| 448 | *
|
---|
| 449 | * @param netif network interface to use for autoip processing
|
---|
| 450 | * @param hdr Incoming ARP packet
|
---|
| 451 | */
|
---|
| 452 | void
|
---|
| 453 | autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
|
---|
| 454 | {
|
---|
| 455 | struct autoip *autoip = netif_autoip_data(netif);
|
---|
| 456 |
|
---|
| 457 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
|
---|
| 458 | if ((autoip != NULL) && (autoip->state != AUTOIP_STATE_OFF)) {
|
---|
| 459 | /* when ip.src == llipaddr && hw.src != netif->hwaddr
|
---|
| 460 | *
|
---|
| 461 | * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
|
---|
| 462 | * we have a conflict and must solve it
|
---|
| 463 | */
|
---|
| 464 | ip4_addr_t sipaddr, dipaddr;
|
---|
| 465 | struct eth_addr netifaddr;
|
---|
| 466 | SMEMCPY(netifaddr.addr, netif->hwaddr, ETH_HWADDR_LEN);
|
---|
| 467 |
|
---|
| 468 | /* Copy struct ip4_addr_wordaligned to aligned ip4_addr, to support compilers without
|
---|
| 469 | * structure packing (not using structure copy which breaks strict-aliasing rules).
|
---|
| 470 | */
|
---|
| 471 | IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&sipaddr, &hdr->sipaddr);
|
---|
| 472 | IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&dipaddr, &hdr->dipaddr);
|
---|
| 473 |
|
---|
| 474 | if (autoip->state == AUTOIP_STATE_PROBING) {
|
---|
| 475 | /* RFC 3927 Section 2.2.1:
|
---|
| 476 | * from beginning to after ANNOUNCE_WAIT
|
---|
| 477 | * seconds we have a conflict if
|
---|
| 478 | * ip.src == llipaddr OR
|
---|
| 479 | * ip.dst == llipaddr && hw.src != own hwaddr
|
---|
| 480 | */
|
---|
| 481 | if ((ip4_addr_cmp(&sipaddr, &autoip->llipaddr)) ||
|
---|
| 482 | (ip4_addr_isany_val(sipaddr) &&
|
---|
| 483 | ip4_addr_cmp(&dipaddr, &autoip->llipaddr) &&
|
---|
| 484 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
|
---|
| 485 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
---|
| 486 | ("autoip_arp_reply(): Probe Conflict detected\n"));
|
---|
| 487 | autoip_restart(netif);
|
---|
| 488 | }
|
---|
| 489 | } else {
|
---|
| 490 | /* RFC 3927 Section 2.5:
|
---|
| 491 | * in any state we have a conflict if
|
---|
| 492 | * ip.src == llipaddr && hw.src != own hwaddr
|
---|
| 493 | */
|
---|
| 494 | if (ip4_addr_cmp(&sipaddr, &autoip->llipaddr) &&
|
---|
| 495 | !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
|
---|
| 496 | LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
|
---|
| 497 | ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
|
---|
| 498 | autoip_handle_arp_conflict(netif);
|
---|
| 499 | }
|
---|
| 500 | }
|
---|
| 501 | }
|
---|
| 502 | }
|
---|
| 503 |
|
---|
| 504 | /** check if AutoIP supplied netif->ip_addr
|
---|
| 505 | *
|
---|
| 506 | * @param netif the netif to check
|
---|
| 507 | * @return 1 if AutoIP supplied netif->ip_addr (state BOUND or ANNOUNCING),
|
---|
| 508 | * 0 otherwise
|
---|
| 509 | */
|
---|
| 510 | u8_t
|
---|
| 511 | autoip_supplied_address(const struct netif *netif)
|
---|
| 512 | {
|
---|
| 513 | if ((netif != NULL) && (netif_autoip_data(netif) != NULL)) {
|
---|
| 514 | struct autoip *autoip = netif_autoip_data(netif);
|
---|
| 515 | return (autoip->state == AUTOIP_STATE_BOUND) || (autoip->state == AUTOIP_STATE_ANNOUNCING);
|
---|
| 516 | }
|
---|
| 517 | return 0;
|
---|
| 518 | }
|
---|
| 519 |
|
---|
| 520 | u8_t
|
---|
| 521 | autoip_accept_packet(struct netif *netif, const ip4_addr_t *addr)
|
---|
| 522 | {
|
---|
| 523 | struct autoip *autoip = netif_autoip_data(netif);
|
---|
| 524 | return (autoip != NULL) && ip4_addr_cmp(addr, &(autoip->llipaddr));
|
---|
| 525 | }
|
---|
| 526 |
|
---|
| 527 | #endif /* LWIP_IPV4 && LWIP_AUTOIP */
|
---|