/************************************************************************* pppoe.h** Declaration of various PPPoE constants** Copyright (C) 2000 Roaring Penguin Software Inc.** This program may be distributed according to the terms of the GNU* General Public License, version 2 or (at your option) any later version.** LIC: GPL** $Id: pppoe.h,v 1.25 2002/07/05 19:32:50 dfs Exp $************************************************************************/#include <stdio.h>		/* For FILE */#include <tmlib/dprintf.h>#include "sys_conf.h"#define PPPOED_NAME   "PPPOED"#define	ETH_DATA_LEN BSP_LAN1_MTU#define	ETH_ALEN BSP_LAN1_HWALEN /* Define various integer types -- assumes a char is 8 bits */typedef unsigned short UINT16_t;typedef unsigned int   UINT32_t;/* Ethernet frame types according to RFC 2516 */#define ETH_PPPOE_DISCOVERY 0x8863#define ETH_PPPOE_SESSION   0x8864/* PPPoE codes */#define CODE_PADI           0x09#define CODE_PADO           0x07#define CODE_PADR           0x19#define CODE_PADS           0x65#define CODE_PADT           0xA7#define CODE_SESS           0x00/* PPPoE Tags */#define TAG_END_OF_LIST        0x0000#define TAG_SERVICE_NAME       0x0101#define TAG_AC_NAME            0x0102#define TAG_HOST_UNIQ          0x0103#define TAG_AC_COOKIE          0x0104#define TAG_VENDOR_SPECIFIC    0x0105#define TAG_RELAY_SESSION_ID   0x0110#define TAG_SERVICE_NAME_ERROR 0x0201#define TAG_AC_SYSTEM_ERROR    0x0202#define TAG_GENERIC_ERROR      0x0203/* Discovery phase states */#define STATE_SENT_PADI     0#define STATE_RECEIVED_PADO 1#define STATE_SENT_PADR     2#define STATE_SESSION       3#define STATE_TERMINATED    4/* How many PADI/PADS attempts? */#define MAX_PADI_ATTEMPTS 3/* Initial timeout for PADO/PADS */#define PADI_TIMEOUT 5/* States for scanning PPP frames */#define STATE_WAITFOR_FRAME_ADDR 0#define STATE_DROP_PROTO         1#define STATE_BUILDING_PACKET    2/* Ethernet headers */struct ethhdr {    char h_dest[ETH_ALEN];    char h_source[ETH_ALEN];    unsigned int eth_type:16;};	/* PPPoE Header, include eth type, but not include Ethernet header & payload */typedef struct PPPoEHeaderStruct {    unsigned int eth_type:16;	#ifdef PACK_BITFIELDS_REVERSED    unsigned int type:4;	/* PPPoE Type (must be 1) */    unsigned int ver:4;		/* PPPoE Version (must be 1) */#else    unsigned int ver:4;		/* PPPoE Version (must be 1) */    unsigned int type:4;	/* PPPoE Type (must be 1) */#endif    unsigned int code:8;	/* PPPoE code */    unsigned int session:16;	/* PPPoE session */    unsigned int length:16;	/* Payload length */    unsigned int protocol:16;} PPPoEHeader;	/* A PPPoE Packet, including Ethernet headers */typedef struct PPPoEPacketStruct {    char h_dest[ETH_ALEN];    char h_source[ETH_ALEN];    unsigned int eth_type:16;    /*struct ethhdr ethHdr;*/	/* Ethernet header */#ifdef PACK_BITFIELDS_REVERSED    unsigned int type:4;	/* PPPoE Type (must be 1) */    unsigned int ver:4;		/* PPPoE Version (must be 1) */#else    unsigned int ver:4;		/* PPPoE Version (must be 1) */    unsigned int type:4;	/* PPPoE Type (must be 1) */#endif    unsigned int code:8;	/* PPPoE code */    unsigned int session:16;	/* PPPoE session */    unsigned int length:16;	/* Payload length */    unsigned char payload[ETH_DATA_LEN]; /* A bit of room to spare */} PPPoEPacket;/* Header size of a PPPoE packet */#define PPPOE_OVERHEAD 6  /* type, code, session, length */#define HDR_SIZE (sizeof(struct ethhdr) + PPPOE_OVERHEAD)#define MAX_PPPOE_PAYLOAD (ETH_DATA_LEN - PPPOE_OVERHEAD)#define MAX_PPPOE_MTU (MAX_PPPOE_PAYLOAD - 2)/* PPPoE Tag */typedef struct PPPoETagStruct {    unsigned int type:16;	/* tag type */    unsigned int length:16;	/* Length of payload */    unsigned char payload[ETH_DATA_LEN]; /* A LOT of room to spare */} PPPoETag;/* Header size of a PPPoE tag */#define TAG_HDR_SIZE 4/* Chunk to read from stdin */#define READ_CHUNK 4096/* Function passed to parsePacket */typedef void ParseFunc(UINT16_t type,		       UINT16_t len,		       unsigned char *data,		       void *extra);#define PPPINITFCS16    0xffff  /* Initial FCS value *//* Keep track of the state of a connection -- collect everything in   one spot */typedef struct PPPoEConnectionStruct {    int discoveryState;		/* Where we are in discovery */    int discoverySocket;	/* Raw socket for discovery frames */    int sessionSocket;		/* Raw socket for session frames */    char myEth[ETH_ALEN]; /* My MAC address */    char peerEth[ETH_ALEN]; /* Peer's MAC address */    UINT16_t session;		/* Session ID */    char *ifName;		/* Interface name */    char *serviceName;		/* Desired service name, if any */    char *acName;		/* Desired AC name, if any */    int synchronous;		/* Use synchronous PPP */    int useHostUniq;		/* Use Host-Uniq tag */    int printACNames;		/* Just print AC names */    int skipDiscovery;		/* Skip discovery */    int noDiscoverySocket;	/* Don't even open discovery socket */    int killSession;		/* Kill session and exit */    FILE *debugFile;		/* Debug file for dumping packets */    int numPADOs;		/* Number of PADO packets received */    PPPoETag cookie;		/* We have to send this if we get it */    PPPoETag relayId;		/* Ditto */    int padi_trans;             /*number of padi's transmit*/    int padr_trans;             /*number of padr's transmit*/} PPPoEConnection;/* Structure used to determine acceptable PADO or PADS packet */struct PacketCriteria {    PPPoEConnection *conn;    int acNameOK;    int serviceNameOK;    int seenACName;    int seenServiceName;};extern PPPoEConnection Connection;/* Function Prototypes */int parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra);void parsePADOTags(UINT16_t type, UINT16_t len, unsigned char *data, void *extra);void parsePADSTags(UINT16_t type, UINT16_t len, unsigned char *data, void *extra);void parseLogErrs(UINT16_t type, UINT16_t len, unsigned char *data, void *extra);void sendPADI(PPPoEConnection *conn);void recvPADO(PPPoEConnection *conn, unsigned char *ptr, unsigned int num);void sendPADR(PPPoEConnection *conn);void recvPADS(PPPoEConnection *conn, unsigned char *ptr, unsigned int num);void sendPADT(PPPoEConnection *conn, char const *msg);void recvPADT(PPPoEConnection *conn, unsigned char *ptr, unsigned int num);static void padi_timeout(caddr_t arg);static void padr_timeout(caddr_t arg);#define SET_STRING(var, val) do { if (var) free(var); var = strDup(val); } while(0);#define CHECK_ROOM(cursor, start, len) \do {\    if (((cursor)-(start))+(len) > MAX_PPPOE_PAYLOAD) { \        syslog(LOG_ERR, "Would create too-long packet"); \        return; \    } \} while(0)/* True if Ethernet address is broadcast or multicast */#define NOT_UNICAST(e) ((e[0] & 0x01) != 0)#define BROADCAST(e) ((e[0] & e[1] & e[2] & e[3] & e[4] & e[5]) == 0xFF)#define NOT_BROADCAST(e) ((e[0] & e[1] & e[2] & e[3] & e[4] & e[5]) != 0xFF)