src/libsystemd-network/dhcp-internal.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright (C) 2013 Intel Corporation. All rights reserved.
   9   Copyright (C) 2014 Tom Gundersen
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 #include <linux/if_packet.h>
  26 #include <net/ethernet.h>
  27 #include <net/if_arp.h>
  28 #include <stdint.h>
  29
  30 #include "sd-dhcp-client.h"
  31
  32 #include "dhcp-protocol.h"
  33 #include "socket-util.h"
  34
  35 int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link,
  36                                  uint32_t xid, const uint8_t *mac_addr,
  37                                  size_t mac_addr_len, uint16_t arp_type);
  38 int dhcp_network_bind_udp_socket(be32_t address, uint16_t port);
  39 int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
  40                                  const void *packet, size_t len);
  41 int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
  42                                  const void *packet, size_t len);
  43
  44 int dhcp_option_append(DHCPMessage *message, size_t size, size_t *offset, uint8_t overload,
  45                        uint8_t code, size_t optlen, const void *optval);
  46
  47 typedef int (*dhcp_option_cb_t)(uint8_t code, uint8_t len,
  48                                 const void *option, void *userdata);
  49
  50 int dhcp_option_parse(DHCPMessage *message, size_t len,
  51                       dhcp_option_cb_t cb, void *userdata);
  52
  53 int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid,
  54                       uint8_t type, uint16_t arp_type, size_t optlen,
  55                       size_t *optoffset);
  56
  57 uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
  58
  59 void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
  60                                    uint16_t source, be32_t destination_addr,
  61                                    uint16_t destination, uint16_t len);
  62
  63 int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum);
  64
  65 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_unref);
  66 #define _cleanup_dhcp_client_unref_ _cleanup_(sd_dhcp_client_unrefp)
  67
  68 /* If we are invoking callbacks of a dhcp-client, ensure unreffing the
  69  * client from the callback doesn't destroy the object we are working
  70  * on */
  71 #define DHCP_CLIENT_DONT_DESTROY(client) \
  72         _cleanup_dhcp_client_unref_ _unused_ sd_dhcp_client *_dont_destroy_##client = sd_dhcp_client_ref(client)
  73
  74 #define log_dhcp_client(client, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "DHCP CLIENT (0x%x): " fmt, client->xid, ##__VA_ARGS__)