File content as of revision 70:cd218dd180e5:

/*********************************************************************
PicoTCP. Copyright (c) 2012 TASS Belgium NV. Some rights reserved.
See LICENSE and COPYING for usage.

.

*********************************************************************/
#ifndef _INCLUDE_PICO_DHCP_COMMON
#define _INCLUDE_PICO_DHCP_COMMON
#include "pico_addressing.h"

#define PICO_DHCPD_PORT (short_be(67))
#define PICO_DHCP_CLIENT_PORT (short_be(68))
#define PICO_DHCPD_MAGIC_COOKIE (long_be(0x63825363))
#define PICO_DHCP_HTYPE_ETH 1

/* flags */
#define PICO_DHCP_FLAG_BROADCAST        0x8000

/* options */
#define PICO_DHCP_OPT_PAD               0x00
#define PICO_DHCP_OPT_NETMASK           0x01
#define PICO_DHCP_OPT_TIME              0x02
#define PICO_DHCP_OPT_ROUTER            0x03
#define PICO_DHCP_OPT_DNS               0x06
#define PICO_DHCP_OPT_HOSTNAME          0x0c
#define PICO_DHCP_OPT_DOMAINNAME        0x0f
#define PICO_DHCP_OPT_MTU               0x1a
#define PICO_DHCP_OPT_BROADCAST         0x1c
#define PICO_DHCP_OPT_NETBIOSNS         0x2c
#define PICO_DHCP_OPT_NETBIOSSCOPE      0x2f
#define PICO_DHCP_OPT_REQIP             0x32
#define PICO_DHCP_OPT_LEASETIME         0x33
#define PICO_DHCP_OPT_OPTOVERLOAD       0x34
#define PICO_DHCP_OPT_MSGTYPE           0x35
#define PICO_DHCP_OPT_SERVERID          0x36
#define PICO_DHCP_OPT_PARAMLIST         0x37
#define PICO_DHCP_OPT_MESSAGE           0x38
#define PICO_DHCP_OPT_MAXMSGSIZE        0x39
#define PICO_DHCP_OPT_RENEWALTIME       0x3a
#define PICO_DHCP_OPT_REBINDINGTIME     0x3b
#define PICO_DHCP_OPT_VENDORID          0x3c
#define PICO_DHCP_OPT_CLIENTID          0x3d
#define PICO_DHCP_OPT_DOMAINSEARCH      0x77
#define PICO_DHCP_OPT_STATICROUTE       0x79
#define PICO_DHCP_OPT_END               0xFF

/* options len */
#define PICO_DHCP_OPTLEN_HDR            2 /* account for code and len field */
#define PICO_DHCP_OPTLEN_NETMASK        6
#define PICO_DHCP_OPTLEN_ROUTER         6
#define PICO_DHCP_OPTLEN_DNS            6
#define PICO_DHCP_OPTLEN_BROADCAST      6
#define PICO_DHCP_OPTLEN_REQIP          6
#define PICO_DHCP_OPTLEN_LEASETIME      6
#define PICO_DHCP_OPTLEN_OPTOVERLOAD    3
#define PICO_DHCP_OPTLEN_MSGTYPE        3
#define PICO_DHCP_OPTLEN_SERVERID       6
#define PICO_DHCP_OPTLEN_PARAMLIST      8 /* PicoTCP specific */
#define PICO_DHCP_OPTLEN_MAXMSGSIZE     4
#define PICO_DHCP_OPTLEN_RENEWALTIME    6
#define PICO_DHCP_OPTLEN_REBINDINGTIME  6
#define PICO_DHCP_OPTLEN_END            1

/* op codes */
#define PICO_DHCP_OP_REQUEST            1
#define PICO_DHCP_OP_REPLY              2

/* rfc message types */
#define PICO_DHCP_MSG_DISCOVER          1
#define PICO_DHCP_MSG_OFFER             2
#define PICO_DHCP_MSG_REQUEST           3
#define PICO_DHCP_MSG_DECLINE           4
#define PICO_DHCP_MSG_ACK               5
#define PICO_DHCP_MSG_NAK               6
#define PICO_DHCP_MSG_RELEASE           7
#define PICO_DHCP_MSG_INFORM            8

/* custom message types */
#define PICO_DHCP_EVENT_T1              9
#define PICO_DHCP_EVENT_T2              10
#define PICO_DHCP_EVENT_LEASE           11
#define PICO_DHCP_EVENT_RETRANSMIT      12

struct __attribute__((packed)) pico_dhcp_hdr
{
	uint8_t op;
	uint8_t htype;
	uint8_t hlen;
	uint8_t hops; //zero
	uint32_t xid; //store this in the request
	uint16_t secs; // ignore
	uint16_t flags;
	uint32_t ciaddr; // client address - if asking for renewal
	uint32_t yiaddr; // your address (client)
	uint32_t siaddr; // dhcp offered address
	uint32_t giaddr; // relay agent, bootp.
	uint8_t hwaddr[6];
	uint8_t hwaddr_padding[10];
	char    hostname[64];
	char    bootp_filename[128];
	uint32_t dhcp_magic;
	uint8_t options[0];
};

struct __attribute__((packed)) pico_dhcp_opt
{
  uint8_t code;
  uint8_t len;
  union {
    struct {
      struct pico_ip4 ip;
    } netmask;
    struct {
      struct pico_ip4 ip;
    } router;
    struct {
      struct pico_ip4 ip;
    } dns;
    struct {
      struct pico_ip4 ip;
    } broadcast;
    struct {
      struct pico_ip4 ip;
    } req_ip;
    struct {
      uint32_t time;
    } lease_time;
    struct {
      uint8_t value;
    } opt_overload;
    struct {
      char name[0];
    } tftp_server;
    struct {
      char name[0];
    } bootfile;
    struct {
      uint8_t type;
    } msg_type;
    struct {
      struct pico_ip4 ip;
    } server_id;
    struct {
      uint8_t code[0];
    } param_list;
    struct {
      char error[0];
    } message;
    struct {
      uint16_t size;
    } max_msg_size;
    struct {
      uint32_t time;
    } renewal_time;
    struct {
      uint32_t time;
    } rebinding_time;
    struct {
      uint8_t id[0];
    } vendor_id;
    struct {
      uint8_t id[0];
    } client_id;
  } ext;
};

uint8_t dhcp_get_next_option(uint8_t *begin, uint8_t *data, int *len, uint8_t **nextopt);
struct pico_dhcp_opt *pico_dhcp_next_option(struct pico_dhcp_opt **ptr);
uint8_t pico_dhcp_are_options_valid(void *ptr, int32_t len);

uint8_t pico_dhcp_opt_netmask(void *ptr, struct pico_ip4 *ip);
uint8_t pico_dhcp_opt_router(void *ptr, struct pico_ip4 *ip);
uint8_t pico_dhcp_opt_dns(void *ptr, struct pico_ip4 *ip);
uint8_t pico_dhcp_opt_broadcast(void *ptr, struct pico_ip4 *ip);
uint8_t pico_dhcp_opt_reqip(void *ptr, struct pico_ip4 *ip);
uint8_t pico_dhcp_opt_leasetime(void *ptr, uint32_t time);
uint8_t pico_dhcp_opt_msgtype(void *ptr, uint8_t type);
uint8_t pico_dhcp_opt_serverid(void *ptr, struct pico_ip4 *ip);
uint8_t pico_dhcp_opt_paramlist(void *ptr);
uint8_t pico_dhcp_opt_maxmsgsize(void *ptr, uint16_t size);
uint8_t pico_dhcp_opt_end(void *ptr);
#endif