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2 * Copyright (c) 2008, 2011 Nicira, Inc.
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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
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. */
28 #define DHCP_MAGIC_COOKIE 0x63825363
30 #define DHCP_HEADER_LEN 236
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. */
49 BUILD_ASSERT_DECL(DHCP_HEADER_LEN
== sizeof(struct dhcp_header
));
51 #define DHCP_OP_REQUEST 1
52 #define DHCP_OP_REPLY 2
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
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