mirror of
https://github.com/xdp-project/BNG-router.git
synced 2024-05-06 15:54:53 +00:00
ac9373c82e
adjustment. Adding map client_vlans which allows matching server responses with client requests. Reformatting Option 82 to include interface name (work in progress, we need to figure out how to convert VLAN tags to ASCII).
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
#include <linux/bpf.h>
|
|
#include <linux/types.h>
|
|
|
|
#define XDP_PROG_SEC "xdp"
|
|
|
|
#define DHCP_SNAME_LEN 64
|
|
#define DHCP_FILE_LEN 128
|
|
|
|
#define DHO_DHCP_AGENT_OPTIONS 82
|
|
#define RAI_CIRCUIT_ID 1
|
|
#define RAI_REMOTE_ID 2
|
|
#define RAI_OPTION_LEN 2
|
|
|
|
#define DHCP_SERVER_PORT 67
|
|
#define DHCP_CLIENT_PORT 68
|
|
#define DHCP_REQUEST 1
|
|
#define DHCP_REPLY 2
|
|
|
|
/* Structure for sub-options in option 82 */
|
|
struct sub_option {
|
|
__u8 option_id;
|
|
__u8 len;
|
|
char val[IF_NAMESIZE];
|
|
};
|
|
|
|
/*structure for dhcp option 82 */
|
|
struct dhcp_option_82 {
|
|
__u8 t;
|
|
__u8 len;
|
|
struct sub_option circuit_id;
|
|
struct sub_option remote_id;
|
|
};
|
|
|
|
/*structure for dhcp option 255 */
|
|
struct dhcp_option_255 {
|
|
__u8 t;
|
|
};
|
|
|
|
struct dhcp_packet {
|
|
__u8 op; /* 0: Message opcode/type */
|
|
__u8 htype; /* 1: Hardware addr type (net/if_types.h) */
|
|
__u8 hlen; /* 2: Hardware addr length */
|
|
__u8 hops; /* 3: Number of relay agent hops from client */
|
|
__u32 xid; /* 4: Transaction ID */
|
|
__u16 secs; /* 8: Seconds since client started looking */
|
|
__u16 flags; /* 10: Flag bits */
|
|
struct in_addr ciaddr; /* 12: Client IP address (if already in use) */
|
|
struct in_addr yiaddr; /* 16: Client IP address */
|
|
struct in_addr siaddr; /* 18: IP address of next server to talk to */
|
|
struct in_addr giaddr; /* 20: DHCP relay agent IP address */
|
|
unsigned char chaddr[16]; /* 24: Client hardware address */
|
|
char sname[DHCP_SNAME_LEN]; /* 40: Server name */
|
|
char file[DHCP_FILE_LEN]; /* 104: Boot filename */
|
|
__u32 cookie; /* 232: Magic cookie */
|
|
unsigned char options[0];
|
|
/* 236: Optional parameters
|
|
(actual length dependent on MTU). */
|
|
};
|