1 | /**
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2 | * @file
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3 | *
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4 | * AutoIP Automatic LinkLocal IP Configuration
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5 | */
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6 |
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7 | /*
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8 | *
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9 | * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
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10 | * All rights reserved.
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11 | *
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12 | * Redistribution and use in source and binary forms, with or without modification,
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13 | * are permitted provided that the following conditions are met:
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14 | *
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15 | * 1. Redistributions of source code must retain the above copyright notice,
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16 | * this list of conditions and the following disclaimer.
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17 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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18 | * this list of conditions and the following disclaimer in the documentation
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19 | * and/or other materials provided with the distribution.
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20 | * 3. The name of the author may not be used to endorse or promote products
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21 | * derived from this software without specific prior written permission.
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22 | *
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23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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32 | * OF SUCH DAMAGE.
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33 | *
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34 | * Author: Dominik Spies <kontakt@dspies.de>
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35 | *
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36 | * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
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37 | * with RFC 3927.
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38 | *
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39 | */
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40 |
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41 | #ifndef LWIP_HDR_AUTOIP_H
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42 | #define LWIP_HDR_AUTOIP_H
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43 |
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44 | #include "lwip/opt.h"
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45 |
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46 | #if LWIP_IPV4 && LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
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47 |
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48 | #include "lwip/netif.h"
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49 | /* #include "lwip/udp.h" */
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50 | #include "lwip/etharp.h"
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51 |
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52 | #ifdef __cplusplus
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53 | extern "C" {
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54 | #endif
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55 |
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56 | /** AutoIP Timing */
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57 | #define AUTOIP_TMR_INTERVAL 100
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58 | #define AUTOIP_TICKS_PER_SECOND (1000 / AUTOIP_TMR_INTERVAL)
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59 |
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60 | /** AutoIP state information per netif */
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61 | struct autoip
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62 | {
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63 | /** the currently selected, probed, announced or used LL IP-Address */
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64 | ip4_addr_t llipaddr;
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65 | /** current AutoIP state machine state */
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66 | u8_t state;
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67 | /** sent number of probes or announces, dependent on state */
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68 | u8_t sent_num;
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69 | /** ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
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70 | u16_t ttw;
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71 | /** ticks until a conflict can be solved by defending */
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72 | u8_t lastconflict;
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73 | /** total number of probed/used Link Local IP-Addresses */
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74 | u8_t tried_llipaddr;
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75 | };
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76 |
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77 |
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78 | void autoip_set_struct(struct netif *netif, struct autoip *autoip);
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79 | /** Remove a struct autoip previously set to the netif using autoip_set_struct() */
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80 | #define autoip_remove_struct(netif) do { (netif)->autoip = NULL; } while (0)
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81 | err_t autoip_start(struct netif *netif);
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82 | err_t autoip_stop(struct netif *netif);
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83 | void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
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84 | void autoip_tmr(void);
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85 | void autoip_network_changed(struct netif *netif);
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86 | u8_t autoip_supplied_address(const struct netif *netif);
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87 |
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88 | /* for lwIP internal use by ip4.c */
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89 | u8_t autoip_accept_packet(struct netif *netif, const ip4_addr_t *addr);
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90 |
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91 | #define netif_autoip_data(netif) ((struct autoip*)netif_get_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP))
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92 |
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93 | #ifdef __cplusplus
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94 | }
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95 | #endif
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96 |
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97 | #endif /* LWIP_IPV4 && LWIP_AUTOIP */
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98 |
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99 | #endif /* LWIP_HDR_AUTOIP_H */
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