src/libsystemd-network/dhcp-internal.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 /***
   5   Copyright © 2013 Intel Corporation. All rights reserved.
   6 ***/
   7
   8 #include <linux/if_packet.h>
   9 #include <net/ethernet.h>
  10 #include <stdint.h>
  11
  12 #include "sd-dhcp-client.h"
  13
  14 #include "dhcp-protocol.h"
  15 #include "ether-addr-util.h"
  16 #include "network-common.h"
  17 #include "socket-util.h"
  18
  19 typedef struct sd_dhcp_option {
  20         unsigned n_ref;
  21
  22         uint8_t option;
  23         void *data;
  24         size_t length;
  25 } sd_dhcp_option;
  26
  27 typedef struct DHCPServerData {
  28         struct in_addr *addr;
  29         size_t size;
  30 } DHCPServerData;
  31
  32 extern const struct hash_ops dhcp_option_hash_ops;
  33
  34 typedef struct sd_dhcp_client sd_dhcp_client;
  35
  36 int dhcp_network_bind_raw_socket(
  37                 int ifindex,
  38                 union sockaddr_union *link,
  39                 uint32_t xid,
  40                 const struct hw_addr_data *hw_addr,
  41                 const struct hw_addr_data *bcast_addr,
  42                 uint16_t arp_type,
  43                 uint16_t port,
  44                 bool so_priority_set,
  45                 int so_priority);
  46 int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port, int ip_service_type);
  47 int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
  48                                  const void *packet, size_t len);
  49 int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
  50                                  const void *packet, size_t len);
  51
  52 int dhcp_option_append(DHCPMessage *message, size_t size, size_t *offset, uint8_t overload,
  53                        uint8_t code, size_t optlen, const void *optval);
  54 int dhcp_option_find_option(uint8_t *options, size_t length, uint8_t wanted_code, size_t *ret_offset);
  55 int dhcp_option_remove_option(uint8_t *options, size_t buflen, uint8_t option_code);
  56
  57 typedef int (*dhcp_option_callback_t)(uint8_t code, uint8_t len,
  58                                 const void *option, void *userdata);
  59
  60 int dhcp_option_parse(DHCPMessage *message, size_t len, dhcp_option_callback_t cb, void *userdata, char **ret_error_message);
  61
  62 int dhcp_option_parse_string(const uint8_t *option, size_t len, char **ret);
  63
  64 int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid,
  65                       uint8_t type, uint16_t arp_type, uint8_t hlen, const uint8_t *chaddr,
  66                       size_t optlen, size_t *optoffset);
  67
  68 uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
  69
  70 void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
  71                                    uint16_t source, be32_t destination_addr,
  72                                    uint16_t destination, uint16_t len, int ip_service_type);
  73
  74 int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum, uint16_t port);
  75
  76 void dhcp_client_set_test_mode(sd_dhcp_client *client, bool test_mode);
  77
  78 /* If we are invoking callbacks of a dhcp-client, ensure unreffing the
  79  * client from the callback doesn't destroy the object we are working
  80  * on */
  81 #define DHCP_CLIENT_DONT_DESTROY(client) \
  82         _cleanup_(sd_dhcp_client_unrefp) _unused_ sd_dhcp_client *_dont_destroy_##client = sd_dhcp_client_ref(client)
  83
  84 #define log_dhcp_client_errno(client, error, fmt, ...)          \
  85         log_interface_prefix_full_errno(                        \
  86                 "DHCPv4 client: ",                              \
  87                 sd_dhcp_client, client,                         \
  88                 error, fmt, ##__VA_ARGS__)
  89 #define log_dhcp_client(client, fmt, ...)                       \
  90         log_interface_prefix_full_errno_zerook(                 \
  91                 "DHCPv4 client: ",                              \
  92                 sd_dhcp_client, client,                         \
  93                 0, fmt, ##__VA_ARGS__)