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 "log-link.h"
  16 #include "socket-util.h"
  17
  18 typedef struct sd_dhcp_option {
  19         unsigned n_ref;
  20
  21         uint8_t option;
  22         void *data;
  23         size_t length;
  24 } sd_dhcp_option;
  25
  26 typedef struct DHCPServerData {
  27         struct in_addr *addr;
  28         size_t size;
  29 } DHCPServerData;
  30
  31 extern const struct hash_ops dhcp_option_hash_ops;
  32
  33 int dhcp_network_bind_raw_socket(int ifindex, union sockaddr_union *link, uint32_t xid,
  34                                  const uint8_t *mac_addr, size_t mac_addr_len,
  35                                  const uint8_t *bcast_addr, size_t bcast_addr_len,
  36                                  uint16_t arp_type, uint16_t port);
  37 int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port, int ip_service_type);
  38 int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
  39                                  const void *packet, size_t len);
  40 int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
  41                                  const void *packet, size_t len);
  42
  43 int dhcp_option_append(DHCPMessage *message, size_t size, size_t *offset, uint8_t overload,
  44                        uint8_t code, size_t optlen, const void *optval);
  45
  46 typedef int (*dhcp_option_callback_t)(uint8_t code, uint8_t len,
  47                                 const void *option, void *userdata);
  48
  49 int dhcp_option_parse(DHCPMessage *message, size_t len, dhcp_option_callback_t cb, void *userdata, char **error_message);
  50
  51 int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid,
  52                       uint8_t type, uint16_t arp_type, size_t optlen,
  53                       size_t *optoffset);
  54
  55 uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len);
  56
  57 void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
  58                                    uint16_t source, be32_t destination_addr,
  59                                    uint16_t destination, uint16_t len, int ip_service_type);
  60
  61 int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum, uint16_t port);
  62
  63 /* If we are invoking callbacks of a dhcp-client, ensure unreffing the
  64  * client from the callback doesn't destroy the object we are working
  65  * on */
  66 #define DHCP_CLIENT_DONT_DESTROY(client) \
  67         _cleanup_(sd_dhcp_client_unrefp) _unused_ sd_dhcp_client *_dont_destroy_##client = sd_dhcp_client_ref(client)
  68
  69 #define log_dhcp_client_errno(client, error, fmt, ...)                  \
  70         ({                                                              \
  71                 int _e = (error);                                       \
  72                 if (DEBUG_LOGGING)                                      \
  73                         log_interface_full_errno(                       \
  74                                 sd_dhcp_client_get_ifname(client),      \
  75                                 LOG_DEBUG, _e, "DHCPv4 client: " fmt,   \
  76                                 ##__VA_ARGS__);                         \
  77                 -ERRNO_VALUE(_e);                                       \
  78         })
  79 #define log_dhcp_client(client, fmt, ...)                       \
  80         log_dhcp_client_errno(client, 0, fmt, ##__VA_ARGS__)