contrib/dhcpcd/src/bpf.h

   1 /* SPDX-License-Identifier: BSD-2-Clause */
   2 /*
   3  * dhcpcd: BPF arp and bootp filtering
   4  * Copyright (c) 2006-2019 Roy Marples <roy@marples.name>
   5  * All rights reserved
   6
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef BPF_HEADER
  30 #define BPF_HEADER
  31
  32 #define BPF_READING             (1U << 0)
  33 #define BPF_EOF                 (1U << 1)
  34 #define BPF_PARTIALCSUM         (1U << 2)
  35 #define BPF_BCAST               (1U << 3)
  36
  37 #include "dhcpcd.h"
  38
  39 extern const char *bpf_name;
  40 size_t bpf_frame_header_len(const struct interface *);
  41 int bpf_frame_bcast(const struct interface *, const char *frame);
  42 int bpf_open(struct interface *, int (*)(struct interface *, int));
  43 int bpf_close(struct interface *, int);
  44 int bpf_attach(int, void *, unsigned int);
  45 ssize_t bpf_send(const struct interface *, int, uint16_t, const void *, size_t);
  46 ssize_t bpf_read(struct interface *, int, void *, size_t, unsigned int *);
  47 int bpf_arp(struct interface *, int);
  48 int bpf_bootp(struct interface *, int);
  49 #endif