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l2tp.h
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l2tp.h
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/*
* Layer Two Tunnelling Protocol Daemon
* Copyright (C) 1998 Adtran, Inc.
* Copyright (C) 2002 Jeff McAdams
*
* Mark Spencer
*
* This software is distributed under the terms
* of the GPL, which you should have received
* along with this source.
*
* Protocol and implementation information,
* structures and constants.
*/
/*
typedef unsigned short _u16;
typedef unsigned long long _u64;
*/
#ifndef _L2TP_H
#define _L2TP_H
#define MAXSTRLEN 120 /* Maximum length of common strings */
#include <netinet/in.h>
#include <termios.h>
#ifdef OPENBSD
# include <util.h>
#endif
#include "osport.h"
#include "scheduler.h"
#include "misc.h"
#include "file.h"
#include "call.h"
#include "avp.h"
#include "control.h"
#include "aaa.h"
#include "common.h"
#include "ipsecmast.h"
#define CONTROL_PIPE "/var/run/xl2tpd/l2tp-control"
#define CONTROL_PIPE_MESSAGE_SIZE 1024
#define BINARY "xl2tpd"
#define SERVER_VERSION "xl2tpd-1.3.1"
#define VENDOR_NAME "xelerance.com"
#ifndef PPPD
#define PPPD "/usr/sbin/pppd"
#endif
#define CALL_PPP_OPTS "defaultroute"
#define FIRMWARE_REV 0x0690 /* Revision of our firmware (software, in this case) */
#define HELLO_DELAY 60 /* How often to send a Hello message */
struct control_hdr
{
_u16 ver; /* Version and more */
_u16 length; /* Length field */
_u16 tid; /* Tunnel ID */
_u16 cid; /* Call ID */
_u16 Ns; /* Next sent */
_u16 Nr; /* Next received */
} __attribute__((packed));
#define CTBIT(ver) (ver & 0x8000) /* Determins if control or not */
#define CLBIT(ver) (ver & 0x4000) /* Length bit present. Must be 1
for control messages */
#define CZBITS(ver) (ver &0x37F8) /* Reserved bits: We must drop
anything with these there */
#define CFBIT(ver) (ver & 0x0800) /* Presence of Ns and Nr fields
flow bit? */
#define CVER(ver) (ver & 0x0007) /* Version of encapsulation */
struct payload_hdr
{
_u16 ver; /* Version and friends */
_u16 length; /* Optional Length */
_u16 tid; /* Tunnel ID */
_u16 cid; /* Caller ID */
_u16 Ns; /* Optional next sent */
_u16 Nr; /* Optional next received */
_u16 o_size; /* Optional offset size */
// _u16 o_pad; /* Optional offset padding */
} __attribute__((packed));
#define NZL_TIMEOUT_DIVISOR 4 /* Divide TIMEOUT by this and
you know how often to send
a zero byte packet */
#define PAYLOAD_BUF 10 /* Provide 10 expansion bytes
so we can "decompress" the
payloads and simplify coding */
#if 1
#define DEFAULT_MAX_RETRIES 5 /* Recommended value from spec */
#else
#define DEFAULT_MAX_RETRIES 95 /* give us more time to debug */
#endif
#define DEFAULT_RWS_SIZE 4 /* Default max outstanding
control packets in queue */
#define DEFAULT_TX_BPS 10000000 /* For outgoing calls, report this speed */
#define DEFAULT_RX_BPS 10000000
#define DEFAULT_MAX_BPS 10000000 /* jz: outgoing calls max bps */
#define DEFAULT_MIN_BPS 10000 /* jz: outgoing calls min bps */
#define PAYLOAD_FUDGE 2 /* How many packets we're willing to drop */
#define MIN_PAYLOAD_HDR_LEN 6
#define UDP_LISTEN_PORT 1701
/* FIXME: MAX_RECV_SIZE, what is it? */
#define MAX_RECV_SIZE 4096 /* Biggest packet we'll accept */
#define OUR_L2TP_VERSION 0x100 /* We support version 1, revision 0 */
#define PTBIT(ver) CTBIT(ver) /* Type bit: Must be zero for us */
#define PLBIT(ver) CLBIT(ver) /* Length specified? */
#define PFBIT(ver) CFBIT(ver) /* Flow control specified? */
#define PVER(ver) CVER(ver) /* Version */
#define PZBITS(ver) (ver & 0x14F8) /* Reserved bits */
#define PRBIT(ver) (ver & 0x2000) /* Reset Sr bit */
#define PSBIT(ver) (ver & 0x0200) /* Offset size bit */
#define PPBIT(ver) (ver & 0x0100) /* Preference bit */
struct tunnel
{
struct call *call_head; /* Member calls */
struct tunnel *next; /* Allows us to be linked easily */
int fc; /* Framing capabilities of peer */
struct schedule_entry *hello;
int ourfc; /* Our framing capabilities */
int bc; /* Peer's bearer channels */
int hbit; /* Allow hidden AVP's? */
int ourbc; /* Our bearer channels */
_u64 tb; /* Their tie breaker */
_u64 ourtb; /* Our tie breaker */
int tid; /* Peer's tunnel identifier */
IPsecSAref_t refme; /* IPsec SA particulars */
IPsecSAref_t refhim;
int ourtid; /* Our tunnel identifier */
int qtid; /* TID for disconnection */
int firmware; /* Peer's firmware revision */
#if 0
unsigned int addr; /* Remote address */
unsigned short port; /* Port on remote end */
#else
struct sockaddr_in peer; /* Peer's Address */
#endif
int debug; /* Are we debugging or not? */
int nego; /* Show Negotiation? */
int count; /* How many membmer calls? */
int state; /* State of tunnel */
_u16 control_seq_num; /* Sequence for next packet */
_u16 control_rec_seq_num; /* Next expected to receive */
int cLr; /* Last packet received by peer */
char hostname[MAXSTRLEN]; /* Remote hostname */
char vendor[MAXSTRLEN]; /* Vendor of remote product */
struct challenge chal_us; /* Their Challenge to us */
struct challenge chal_them; /* Our challenge to them */
char secret[MAXSTRLEN]; /* Secret to use */
#ifdef SANITY
int sanity; /* check for sanity? */
#endif
int rws; /* Peer's Receive Window Size */
int ourrws; /* Receive Window Size */
int rxspeed; /* Receive bps */
int txspeed; /* Transmit bps */
struct call *self;
struct lns *lns; /* LNS that owns us */
struct lac *lac; /* LAC that owns us */
};
struct tunnel_list
{
struct tunnel *head;
int count;
int calls;
};
/* Values for version */
#define VER_L2TP 2
#define VER_PPTP 3
/* Some PPP sync<->async stuff */
#define fcstab ppp_crc16_table
#define PPP_FLAG 0x7e
#define PPP_ESCAPE 0x7d
#define PPP_TRANS 0x20
#define PPP_INITFCS 0xffff
#define PPP_GOODFCS 0xf0b8
#define PPP_FCS(fcs,c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
/* Values for Randomness sources */
#define RAND_DEV 0x0
#define RAND_SYS 0x1
#define RAND_EGD 0x2
/* Error Values */
extern struct tunnel_list tunnels;
extern void tunnel_close (struct tunnel *t);
extern void network_thread ();
extern int init_network ();
extern int kernel_support;
extern int server_socket;
extern struct tunnel *new_tunnel ();
extern struct packet_queue xmit_udp;
extern void destroy_tunnel (struct tunnel *);
extern struct buffer *new_payload (struct sockaddr_in);
extern void recycle_payload (struct buffer *, struct sockaddr_in);
extern void add_payload_hdr (struct tunnel *, struct call *, struct buffer *);
extern int read_packet (struct buffer *, int, int);
extern void udp_xmit (struct buffer *buf, struct tunnel *t);
extern void control_xmit (void *);
extern int ppd;
extern int switch_io; /* jz */
extern int control_fd;
extern int start_pppd (struct call *c, struct ppp_opts *);
extern void magic_lac_dial (void *);
extern int get_entropy (unsigned char *, int);
#ifndef MIN
#define MIN(a,b) (((a)<(b)) ? (a) : (b))
#endif
#endif
/*
* This is just some stuff to take
* care of kernel definitions
*/
#ifdef USE_KERNEL
#include <net/if.h>
#include <linux/if_ether.h>
#include <linux/if_pppox.h>
#include <linux/if_pppol2tp.h>
#endif