lib/dhcp.h

   1 /*
   2  * Copyright (c) 2008, 2011 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef DHCP_H
  18 #define DHCP_H 1
  19
  20 #include <stdint.h>
  21 #include "packets.h"
  22 #include "util.h"
  23
  24 /* Ports used by DHCP. */
  25 #define DHCP_SERVER_PORT        67       /* Port used by DHCP server. */
  26 #define DHCP_CLIENT_PORT        68       /* Port used by DHCP client. */
  27
  28 #define DHCP_MAGIC_COOKIE 0x63825363
  29
  30 #define DHCP_HEADER_LEN 236
  31 OVS_PACKED(
  32 struct dhcp_header {
  33     uint8_t op;                 /* DHCP_BOOTREQUEST or DHCP_BOOTREPLY. */
  34     uint8_t htype;              /* ARP_HRD_ETHERNET (typically). */
  35     uint8_t hlen;               /* ETH_ADDR_LEN (typically). */
  36     uint8_t hops;               /* Hop count; set to 0 by client. */
  37     ovs_be32 xid;               /* Transaction ID. */
  38     ovs_be16 secs;              /* Since client started address acquisition. */
  39     ovs_be16 flags;             /* DHCP_FLAGS_*. */
  40     ovs_be32 ciaddr;            /* Client IP, if it has a lease for one. */
  41     ovs_be32 yiaddr;            /* Client ("your") IP address. */
  42     ovs_be32 siaddr;            /* Next server IP address. */
  43     ovs_be32 giaddr;            /* Relay agent IP address. */
  44     uint8_t chaddr[16];         /* Client hardware address. */
  45     char sname[64];             /* Optional server host name. */
  46     char file[128];             /* Boot file name. */
  47     /* Followed by variable-length options field. */
  48 });
  49 BUILD_ASSERT_DECL(DHCP_HEADER_LEN == sizeof(struct dhcp_header));
  50
  51 #define DHCP_OP_REQUEST    1
  52 #define DHCP_OP_REPLY      2
  53
  54 #define DHCP_MSG_DISCOVER  1
  55 #define DHCP_MSG_OFFER     2
  56 #define DHCP_MSG_REQUEST   3
  57 #define DHCP_MSG_ACK       5
  58 #define DHCP_MSG_NAK       6
  59
  60 #define DHCP_OPT_PAD       0
  61 #define DHCP_OPT_REQ_IP    50
  62 #define DHCP_OPT_MSG_TYPE  53
  63 #define DHCP_OPT_END       255
  64
  65 #endif /* dhcp.h */