diff options
Diffstat (limited to 'release/src/router/busybox/networking/udhcp/dhcpd.h')
| -rw-r--r-- | release/src/router/busybox/networking/udhcp/dhcpd.h | 218 |
1 files changed, 112 insertions, 106 deletions
diff --git a/release/src/router/busybox/networking/udhcp/dhcpd.h b/release/src/router/busybox/networking/udhcp/dhcpd.h index e219143c..9667c61e 100644 --- a/release/src/router/busybox/networking/udhcp/dhcpd.h +++ b/release/src/router/busybox/networking/udhcp/dhcpd.h @@ -1,11 +1,9 @@ +/* vi: set sw=4 ts=4: */ /* dhcpd.h */ -#ifndef _DHCPD_H -#define _DHCPD_H +#ifndef UDHCP_DHCPD_H +#define UDHCP_DHCPD_H 1 -#include <netinet/ip.h> -#include <netinet/udp.h> - -#include "leases.h" +PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN /************************************/ /* Defaults _you_ may want to tweak */ @@ -13,118 +11,126 @@ /* the period of time the client is allowed to use that address */ #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */ +#define LEASES_FILE CONFIG_DHCPD_LEASES_FILE /* where to find the DHCP server configuration file */ #define DHCPD_CONF_FILE "/etc/udhcpd.conf" -/*****************************************************************/ -/* Do not modify below here unless you know what you are doing!! */ -/*****************************************************************/ - -/* DHCP protocol -- see RFC 2131 */ -#define SERVER_PORT 67 -#define CLIENT_PORT 68 - -#define DHCP_MAGIC 0x63825363 - -/* DHCP option codes (partial list) */ -#define DHCP_PADDING 0x00 -#define DHCP_SUBNET 0x01 -#define DHCP_TIME_OFFSET 0x02 -#define DHCP_ROUTER 0x03 -#define DHCP_TIME_SERVER 0x04 -#define DHCP_NAME_SERVER 0x05 -#define DHCP_DNS_SERVER 0x06 -#define DHCP_LOG_SERVER 0x07 -#define DHCP_COOKIE_SERVER 0x08 -#define DHCP_LPR_SERVER 0x09 -#define DHCP_HOST_NAME 0x0c -#define DHCP_BOOT_SIZE 0x0d -#define DHCP_DOMAIN_NAME 0x0f -#define DHCP_SWAP_SERVER 0x10 -#define DHCP_ROOT_PATH 0x11 -#define DHCP_IP_TTL 0x17 -#define DHCP_MTU 0x1a -#define DHCP_BROADCAST 0x1c -#define DHCP_NTP_SERVER 0x2a -#define DHCP_WINS_SERVER 0x2c -#define DHCP_REQUESTED_IP 0x32 -#define DHCP_LEASE_TIME 0x33 -#define DHCP_OPTION_OVER 0x34 -#define DHCP_MESSAGE_TYPE 0x35 -#define DHCP_SERVER_ID 0x36 -#define DHCP_PARAM_REQ 0x37 -#define DHCP_MESSAGE 0x38 -#define DHCP_MAX_SIZE 0x39 -#define DHCP_T1 0x3a -#define DHCP_T2 0x3b -#define DHCP_VENDOR 0x3c -#define DHCP_CLIENT_ID 0x3d - -#define DHCP_END 0xFF - - -#define BOOTREQUEST 1 -#define BOOTREPLY 2 - -#define ETH_10MB 1 -#define ETH_10MB_LEN 6 - -#define DHCPDISCOVER 1 -#define DHCPOFFER 2 -#define DHCPREQUEST 3 -#define DHCPDECLINE 4 -#define DHCPACK 5 -#define DHCPNAK 6 -#define DHCPRELEASE 7 -#define DHCPINFORM 8 - -#define BROADCAST_FLAG 0x8000 - -#define OPTION_FIELD 0 -#define FILE_FIELD 1 -#define SNAME_FIELD 2 - -/* miscellaneous defines */ -#define MAC_BCAST_ADDR (unsigned char *) "\xff\xff\xff\xff\xff\xff" -#define OPT_CODE 0 -#define OPT_LEN 1 -#define OPT_DATA 2 - struct option_set { - unsigned char *data; + uint8_t *data; struct option_set *next; }; +struct static_lease { + struct static_lease *next; + uint32_t ip; + uint8_t mac[6]; +}; + struct server_config_t { - u_int32_t server; /* Our IP, in network order */ - u_int32_t start; /* Start address of leases, network order */ - u_int32_t end; /* End of leases, network order */ - struct option_set *options; /* List of DHCP options loaded from the config file */ - char *interface; /* The name of the interface to use */ - int ifindex; /* Index number of the interface to use */ - unsigned char arp[6]; /* Our arp address */ - unsigned long lease; /* lease time in seconds (host order) */ - unsigned long max_leases; /* maximum number of leases (including reserved address) */ - char remaining; /* should the lease file be interpreted as lease time remaining, or - * as the time the lease expires */ - unsigned long auto_time; /* how long should udhcpd wait before writing a config file. - * if this is zero, it will only write one on SIGUSR1 */ - unsigned long decline_time; /* how long an address is reserved if a client returns a - * decline message */ - unsigned long conflict_time; /* how long an arp conflict offender is leased for */ - unsigned long offer_time; /* how long an offered address is reserved */ - unsigned long min_lease; /* minimum lease a client can request*/ + uint32_t server; /* Our IP, in network order */ +#if ENABLE_FEATURE_UDHCP_PORT + uint16_t port; +#endif + /* start,end are in host order: we need to compare start <= ip <= end */ + uint32_t start_ip; /* Start address of leases, in host order */ + uint32_t end_ip; /* End of leases, in host order */ + struct option_set *options; /* List of DHCP options loaded from the config file */ + char *interface; /* The name of the interface to use */ + int ifindex; /* Index number of the interface to use */ + uint8_t arp[6]; /* Our arp address */ +// disabled: dumpleases has no way of knowing this value, +// and will break if it's off. Now it's on always. +// char remaining; /* Should the lease time in lease file +// * be written as lease time remaining, or +// * as the absolute time the lease expires */ + uint32_t lease; /* lease time in seconds (host order) */ + uint32_t max_leases; /* maximum number of leases (including reserved address) */ + uint32_t auto_time; /* how long should udhcpd wait before writing a config file. + * if this is zero, it will only write one on SIGUSR1 */ + uint32_t decline_time; /* how long an address is reserved if a client returns a + * decline message */ + uint32_t conflict_time; /* how long an arp conflict offender is leased for */ + uint32_t offer_time; /* how long an offered address is reserved */ + uint32_t min_lease; /* minimum lease time a client can request */ + uint32_t siaddr; /* next server bootp option */ char *lease_file; char *pidfile; - char *notify_file; /* What to run whenever leases are written */ - u_int32_t siaddr; /* next server bootp option */ - char *sname; /* bootp server name */ - char *boot_file; /* bootp boot file option */ -}; + char *notify_file; /* What to run whenever leases are written */ + char *sname; /* bootp server name */ + char *boot_file; /* bootp boot file option */ + struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */ +}; + +#define server_config (*(struct server_config_t*)&bb_common_bufsiz1) +/* client_config sits in 2nd half of bb_common_bufsiz1 */ + +#if ENABLE_FEATURE_UDHCP_PORT +#define SERVER_PORT (server_config.port) +#else +#define SERVER_PORT 67 +#endif + + +/*** leases.h ***/ + +typedef uint32_t leasetime_t; +typedef int32_t signed_leasetime_t; + +struct dhcpOfferedAddr { + uint8_t chaddr[16]; + /* In network order */ + uint32_t yiaddr; + /* Unix time when lease expires, regardless of value of + * server_config.remaining. Kept in memory in host order. + * When written to file, converted to network order + * and optionally adjusted (current time subtracted) + * if server_config.remaining = 1 */ + leasetime_t expires; + uint8_t hostname[20]; /* (size is a multiply of 4) */ +}; -extern struct server_config_t server_config; extern struct dhcpOfferedAddr *leases; - + +struct dhcpOfferedAddr *add_lease( + const uint8_t *chaddr, uint32_t yiaddr, + leasetime_t leasetime, uint8_t *hostname + ) FAST_FUNC; +int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC; +struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC; +struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC; +uint32_t find_free_or_expired_address(void) FAST_FUNC; + + +/*** static_leases.h ***/ + +/* Config file will pass static lease info to this function which will add it + * to a data structure that can be searched later */ +void addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip) FAST_FUNC; +/* Check to see if a mac has an associated static lease */ +uint32_t getIpByMac(struct static_lease *lease_struct, void *arg) FAST_FUNC; +/* Check to see if an ip is reserved as a static ip */ +int reservedIp(struct static_lease *lease_struct, uint32_t ip) FAST_FUNC; +/* Print out static leases just to check what's going on (debug code) */ +void printStaticLeases(struct static_lease **lease_struct) FAST_FUNC; + + +/*** serverpacket.h ***/ + +int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC; +int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC; +int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC; +int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC; + + +/*** files.h ***/ + +void read_config(const char *file) FAST_FUNC; +void write_leases(void) FAST_FUNC; +void read_leases(const char *file) FAST_FUNC; +struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC; + + +POP_SAVED_FUNCTION_VISIBILITY #endif |