243 lines
8.1 KiB
C
243 lines
8.1 KiB
C
/*
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* Layer Two Tunnelling Protocol Daemon
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* Copyright (C) 1998 Adtran, Inc.
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* Copyright (C) 2002 Jeff McAdams
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*
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* Mark Spencer
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*
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* This software is distributed under the terms
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* of the GPL, which you should have received
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* along with this source.
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*
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* Protocol and implementation information,
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* structures and constants.
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*/
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/*
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typedef unsigned short _u16;
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typedef unsigned long long _u64;
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*/
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#ifndef _L2TP_H
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#define _L2TP_H
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#define MAXSTRLEN 120 /* Maximum length of common strings */
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#include <netinet/in.h>
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#include <termios.h>
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#include "osport.h"
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#include "scheduler.h"
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#include "misc.h"
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#include "file.h"
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#include "call.h"
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#include "avp.h"
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#include "control.h"
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#include "aaa.h"
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#include "common.h"
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#include "ipsecmast.h"
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#define CONTROL_PIPE "/var/run/l2tp-control"
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#define BINARY "xl2tpd"
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#define SERVER_VERSION "xl2tpd-1.1.12"
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#define VENDOR_NAME "xelerance.com"
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#ifndef PPPD
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#define PPPD "/usr/sbin/pppd"
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#endif
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#define CALL_PPP_OPTS "defaultroute"
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#define FIRMWARE_REV 0x0690 /* Revision of our firmware (software, in this case) */
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#define DEF_MAX_TUNNELS 32 /* By default only allow this many
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tunnels to exist */
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#define HELLO_DELAY 60 /* How often to send a Hello message */
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struct control_hdr
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{
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_u16 ver; /* Version and more */
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_u16 length; /* Length field */
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_u16 tid; /* Tunnel ID */
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_u16 cid; /* Call ID */
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_u16 Ns; /* Next sent */
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_u16 Nr; /* Next received */
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} __attribute__((packed));
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#define CTBIT(ver) (ver & 0x8000) /* Determins if control or not */
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#define CLBIT(ver) (ver & 0x4000) /* Length bit present. Must be 1
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for control messages */
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#define CZBITS(ver) (ver &0x37F8) /* Reserved bits: We must drop
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anything with these there */
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#define CFBIT(ver) (ver & 0x0800) /* Presence of Ns and Nr fields
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flow bit? */
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#define CVER(ver) (ver & 0x0007) /* Version of encapsulation */
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struct payload_hdr
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{
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_u16 ver; /* Version and friends */
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_u16 length; /* Optional Length */
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_u16 tid; /* Tunnel ID */
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_u16 cid; /* Caller ID */
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_u16 Ns; /* Optional next sent */
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_u16 Nr; /* Optional next received */
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_u16 o_size; /* Optional offset size */
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_u16 o_pad; /* Optional offset padding */
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} __attribute__((packed));
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#define NZL_TIMEOUT_DIVISOR 4 /* Divide TIMEOUT by this and
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you know how often to send
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a zero byte packet */
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#define PAYLOAD_BUF 10 /* Provide 10 expansion bytes
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so we can "decompress" the
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payloads and simplify coding */
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#if 1
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/* Modify by chz */
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//#define DEFAULT_MAX_RETRIES 5 /* Recommended value from spec */
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#define DEFAULT_MAX_RETRIES 15 /* Recommended value from spec */
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/* end modify */
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#else
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#define DEFAULT_MAX_RETRIES 95 /* give us more time to debug */
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#endif
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#define DEFAULT_RWS_SIZE 4 /* Default max outstanding
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control packets in queue */
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#define DEFAULT_TX_BPS 10000000 /* For outgoing calls, report this speed */
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#define DEFAULT_RX_BPS 10000000
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#define DEFAULT_MAX_BPS 10000000 /* jz: outgoing calls max bps */
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#define DEFAULT_MIN_BPS 10000 /* jz: outgoing calls min bps */
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#define PAYLOAD_FUDGE 2 /* How many packets we're willing to drop */
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#define MIN_PAYLOAD_HDR_LEN 6
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#define UDP_LISTEN_PORT 1701
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/* FIXME: MAX_RECV_SIZE, what is it? */
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#define MAX_RECV_SIZE 4096 /* Biggest packet we'll accept */
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#define OUR_L2TP_VERSION 0x100 /* We support version 1, revision 0 */
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#define PTBIT(ver) CTBIT(ver) /* Type bit: Must be zero for us */
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#define PLBIT(ver) CLBIT(ver) /* Length specified? */
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#define PFBIT(ver) CFBIT(ver) /* Flow control specified? */
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#define PVER(ver) CVER(ver) /* Version */
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#define PZBITS(ver) (ver & 0x14F8) /* Reserved bits */
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#define PRBIT(ver) (ver & 0x2000) /* Reset Sr bit */
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#define PSBIT(ver) (ver & 0x0200) /* Offset size bit */
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#define PPBIT(ver) (ver & 0x0100) /* Preference bit */
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struct tunnel
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{
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struct call *call_head; /* Member calls */
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struct tunnel *next; /* Allows us to be linked easily */
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int fc; /* Framing capabilities of peer */
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struct schedule_entry *hello;
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int ourfc; /* Our framing capabilities */
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int bc; /* Peer's bearer channels */
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int hbit; /* Allow hidden AVP's? */
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int ourbc; /* Our bearer channels */
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_u64 tb; /* Their tie breaker */
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_u64 ourtb; /* Our tie breaker */
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int tid; /* Peer's tunnel identifier */
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IPsecSAref_t refme; /* IPsec SA particulars */
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IPsecSAref_t refhim;
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int ourtid; /* Our tunnel identifier */
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int qtid; /* TID for disconnection */
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int firmware; /* Peer's firmware revision */
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#if 0
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unsigned int addr; /* Remote address */
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unsigned short port; /* Port on remote end */
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#else
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struct sockaddr_in peer; /* Peer's Address */
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#endif
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int debug; /* Are we debugging or not? */
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int nego; /* Show Negotiation? */
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int count; /* How many membmer calls? */
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int state; /* State of tunnel */
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_u16 control_seq_num; /* Sequence for next packet */
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_u16 control_rec_seq_num; /* Next expected to receive */
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int cLr; /* Last packet received by peer */
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char hostname[MAXSTRLEN]; /* Remote hostname */
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char vendor[MAXSTRLEN]; /* Vendor of remote product */
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struct challenge chal_us; /* Their Challenge to us */
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struct challenge chal_them; /* Our challenge to them */
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char secret[MAXSTRLEN]; /* Secret to use */
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#ifdef SANITY
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int sanity; /* check for sanity? */
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#endif
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int rws; /* Peer's Receive Window Size */
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int ourrws; /* Receive Window Size */
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struct call *self;
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struct lns *lns; /* LNS that owns us */
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struct lac *lac; /* LAC that owns us */
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};
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struct tunnel_list
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{
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struct tunnel *head;
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int count;
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int calls;
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};
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/* Values for version */
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#define VER_L2TP 2
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#define VER_PPTP 3
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/* Some PPP sync<->async stuff */
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#define fcstab ppp_crc16_table
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#define PPP_FLAG 0x7e
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#define PPP_ESCAPE 0x7d
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#define PPP_TRANS 0x20
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#define PPP_INITFCS 0xffff
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#define PPP_GOODFCS 0xf0b8
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#define PPP_FCS(fcs,c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
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/* Values for Randomness sources */
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#define RAND_DEV 0x0
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#define RAND_SYS 0x1
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#define RAND_EGD 0x2
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/* Error Values */
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extern struct tunnel_list tunnels;
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extern void tunnel_close (struct tunnel *t);
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extern void network_thread ();
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extern int init_network ();
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extern int max_tunnels;
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extern int kernel_support;
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extern int server_socket;
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extern struct tunnel *new_tunnel ();
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extern struct packet_queue xmit_udp;
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extern void destroy_tunnel (struct tunnel *);
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extern struct buffer *new_payload (struct sockaddr_in);
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extern void recycle_payload (struct buffer *, struct sockaddr_in);
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extern void add_payload_hdr (struct tunnel *, struct call *, struct buffer *);
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extern int read_packet (struct buffer *, int, int);
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extern void udp_xmit (struct buffer *buf, struct tunnel *t);
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extern void control_xmit (void *);
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extern int ppd;
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extern int switch_io; /* jz */
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extern int control_fd;
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extern int start_pppd (struct call *c, struct ppp_opts *);
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extern void magic_lac_dial (void *);
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extern int get_entropy (unsigned char *, int);
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#ifndef MIN
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#define MIN(a,b) (((a)<(b)) ? (a) : (b))
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#endif
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#endif
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/*
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* This is just some stuff to take
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* care of kernel definitions
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*/
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#ifdef USE_KERNEL
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#include <net/if.h>
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#include <linux/if_ether.h>
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#include "if_pppox.h"
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#endif
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