| Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2015 Roy Marples <roy@marples.name> |
| 4 | * All rights reserved |
| 5 | |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #ifndef ARP_H |
| 29 | #define ARP_H |
| 30 | |
| 31 | /* ARP timings from RFC5227 */ |
| 32 | #define PROBE_WAIT 1 |
| 33 | #define PROBE_NUM 3 |
| 34 | #define PROBE_MIN 1 |
| 35 | #define PROBE_MAX 2 |
| 36 | #define ANNOUNCE_WAIT 2 |
| 37 | #define ANNOUNCE_NUM 2 |
| 38 | #define ANNOUNCE_INTERVAL 2 |
| 39 | #define MAX_CONFLICTS 10 |
| 40 | #define RATE_LIMIT_INTERVAL 60 |
| 41 | #define DEFEND_INTERVAL 10 |
| 42 | |
| 43 | #include "dhcpcd.h" |
| 44 | |
| 45 | struct arp_msg { |
| 46 | uint16_t op; |
| 47 | unsigned char sha[HWADDR_LEN]; |
| 48 | struct in_addr sip; |
| 49 | unsigned char tha[HWADDR_LEN]; |
| 50 | struct in_addr tip; |
| 51 | }; |
| 52 | |
| 53 | struct arp_state { |
| 54 | TAILQ_ENTRY(arp_state) next; |
| 55 | struct interface *iface; |
| 56 | |
| 57 | void (*probed_cb)(struct arp_state *); |
| 58 | void (*announced_cb)(struct arp_state *); |
| 59 | void (*conflicted_cb)(struct arp_state *, const struct arp_msg *); |
| 60 | |
| Samuel Tan | 1c4088e | 2015-08-13 16:18:58 -0700 | [diff] [blame] | 61 | struct in_addr src_addr; |
| Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 62 | struct in_addr addr; |
| 63 | int probes; |
| 64 | int claims; |
| 65 | struct in_addr failed; |
| Samuel Tan | f20514b | 2015-08-13 16:24:02 -0700 | [diff] [blame] | 66 | uint8_t dest_hwlen; |
| 67 | unsigned char dest_hwaddr[HWADDR_LEN]; |
| Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 68 | }; |
| 69 | TAILQ_HEAD(arp_statehead, arp_state); |
| 70 | |
| 71 | #ifdef INET |
| 72 | void arp_report_conflicted(const struct arp_state *, const struct arp_msg *); |
| 73 | void arp_announce(struct arp_state *); |
| 74 | void arp_probe(struct arp_state *); |
| 75 | struct arp_state *arp_new(struct interface *, const struct in_addr *); |
| 76 | void arp_cancel(struct arp_state *); |
| 77 | void arp_free(struct arp_state *); |
| 78 | void arp_free_but(struct arp_state *); |
| 79 | void arp_close(struct interface *); |
| 80 | |
| 81 | void arp_handleifa(int, struct interface *, const struct in_addr *, int); |
| 82 | #else |
| 83 | #define arp_close(a) {} |
| 84 | #endif |
| 85 | #endif |