src/libsystemd-network/dhcp-internal.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright (C) 2013 Intel Corporation. All rights reserved.
   8   Copyright (C) 2014 Tom Gundersen
   9 ***/
  10
  11 #include <linux/if_packet.h>
  12 #include <net/ethernet.h>
  13 #include <net/if_arp.h>
  14 #include <stdint.h>
  15
  16 #include "sd-dhcp-client.h"
  17
  18 #include "dhcp-protocol.h"
  19 #include "socket-util.h"
  20
  21 int dhcp_network_bind_raw_socket(int ifindex, union sockaddr_union *link,
  22                                  uint32_t xid, const uint8_t *mac_addr,
  23                                  size_t mac_addr_len, uint16_t arp_type,
  24                                  uint16_t port);
  25 int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port);
  26 int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
  27                                  const void *packet, size_t len);
  28 int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
  29                                  const void *packet, size_t len);
  30
  31 int dhcp_option_append(DHCPMessage *message, size_t size, size_t *offset, uint8_t overload,
  32                        uint8_t code, size_t optlen, const void *optval);
  33
  34 typedef int (*dhcp_option_callback_t)(uint8_t code, uint8_t len,
  35                                 const void *option, void *userdata);
  36
  37 int dhcp_option_parse(DHCPMessage *message, size_t len, dhcp_option_callback_t cb, void *userdata, char **error_message);
  38
  39 int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid,
  40                       uint8_t type, uint16_t arp_type, size_t optlen,
  41                       size_t *optoffset);
  42
  43 uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
  44
  45 void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
  46                                    uint16_t source, be32_t destination_addr,
  47                                    uint16_t destination, uint16_t len);
  48
  49 int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum, uint16_t port);
  50
  51 /* If we are invoking callbacks of a dhcp-client, ensure unreffing the
  52  * client from the callback doesn't destroy the object we are working
  53  * on */
  54 #define DHCP_CLIENT_DONT_DESTROY(client) \
  55         _cleanup_(sd_dhcp_client_unrefp) _unused_ sd_dhcp_client *_dont_destroy_##client = sd_dhcp_client_ref(client)
  56
  57 #define log_dhcp_client_errno(client, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "DHCP CLIENT (0x%x): " fmt, client->xid, ##__VA_ARGS__)
  58 #define log_dhcp_client(client, fmt, ...) log_dhcp_client_errno(client, 0, fmt, ##__VA_ARGS__)