pppoe.h

PPPoE协议在Psos中的实现源代码

/***********************************************************************
*
* 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)