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Diffstat (limited to 'src/arp.h')
| -rw-r--r-- | src/arp.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/arp.h b/src/arp.h new file mode 100644 index 000000000000..0ac8ef711622 --- /dev/null +++ b/src/arp.h @@ -0,0 +1,106 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ +/* + * dhcpcd - DHCP client daemon + * Copyright (c) 2006-2021 Roy Marples <roy@marples.name> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. + */ + +#ifndef ARP_H +#define ARP_H + +/* ARP timings from RFC5227 */ +#define PROBE_WAIT 1 +#define PROBE_NUM 3 +#define PROBE_MIN 1 +#define PROBE_MAX 2 +#define ANNOUNCE_WAIT 2 +#define ANNOUNCE_NUM 2 +#define ANNOUNCE_INTERVAL 2 +#define MAX_CONFLICTS 10 +#define RATE_LIMIT_INTERVAL 60 +#define DEFEND_INTERVAL 10 + +#include "bpf.h" +#include "dhcpcd.h" +#include "if.h" + +#ifdef IN_IFF_DUPLICATED +/* NetBSD gained RFC 5227 support in the kernel. + * This means dhcpcd doesn't need ARP except for ARPing support + * and ARP announcing an address. */ +#if defined(__NetBSD_Version__) && __NetBSD_Version__ >= 799003900 +#define KERNEL_RFC5227 +#endif +#endif + +struct arp_msg { + uint16_t op; + uint8_t sha[HWADDR_LEN]; + struct in_addr sip; + uint8_t tha[HWADDR_LEN]; + struct in_addr tip; + /* Frame header and sender to diagnose failures */ + uint8_t fsha[HWADDR_LEN]; + uint8_t ftha[HWADDR_LEN]; +}; + +struct arp_state { + TAILQ_ENTRY(arp_state) next; + struct interface *iface; + struct in_addr addr; + struct bpf *bpf; + + int probes; + int claims; + struct timespec defend; + + void (*found_cb)(struct arp_state *, const struct arp_msg *); + void (*not_found_cb)(struct arp_state *); + void (*announced_cb)(struct arp_state *); + void (*defend_failed_cb)(struct arp_state *); + void (*free_cb)(struct arp_state *); +}; +TAILQ_HEAD(arp_statehead, arp_state); + +struct iarp_state { + struct arp_statehead arp_states; +}; + +#define ARP_STATE(ifp) \ + ((struct iarp_state *)(ifp)->if_data[IF_DATA_ARP]) +#define ARP_CSTATE(ifp) \ + ((const struct iarp_state *)(ifp)->if_data[IF_DATA_ARP]) + +#ifdef ARP +void arp_packet(struct interface *, uint8_t *, size_t, unsigned int); +struct arp_state *arp_new(struct interface *, const struct in_addr *); +void arp_probe(struct arp_state *); +struct arp_state *arp_announceaddr(struct dhcpcd_ctx *, const struct in_addr *); +struct arp_state *arp_ifannounceaddr(struct interface *, const struct in_addr *); +struct arp_state * arp_find(struct interface *, const struct in_addr *); +void arp_free(struct arp_state *); +void arp_freeaddr(struct interface *, const struct in_addr *); +void arp_drop(struct interface *); +#endif /* ARP */ +#endif /* ARP_H */ |