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	1	/*
	2	* ppp_defs.h - PPP definitions.
	3	*
	4	* Copyright (c) 1994 The Australian National University.
	5	* All rights reserved.
	6	*
	7	* Permission to use, copy, modify, and distribute this software and its
	8	* documentation is hereby granted, provided that the above copyright
	9	* notice appears in all copies. This software is provided without any
	10	* warranty, express or implied. The Australian National University
	11	* makes no representations about the suitability of this software for
	12	* any purpose.
	13	*
	14	* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
	15	* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
	16	* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
	17	* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
	18	* OF SUCH DAMAGE.
	19	*
	20	* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
	21	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	22	* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
	23	* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
	24	* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
	25	* OR MODIFICATIONS.
	26	*
	27	* $FreeBSD: src/sys/net/ppp_defs.h,v 1.6.2.1 2001/07/03 11:01:41 ume Exp $
	28	* $DragonFly: src/sys/net/ppp_layer/ppp_defs.h,v 1.3 2003/08/26 20:49:48 rob Exp $
	29	*/
	30
	31	#ifndef _PPP_DEFS_H_
	32	#define _PPP_DEFS_H_
	33
	34	/*
	35	* The basic PPP frame.
	36	*/
	37	#define PPP_HDRLEN 4 /* octets for standard ppp header */
	38	#define PPP_FCSLEN 2 /* octets for FCS */
	39	#define PPP_MRU 1500 /* default MRU = max length of info field */
	40
	41	#define PPP_ADDRESS(p) (((u_char *)(p))[0])
	42	#define PPP_CONTROL(p) (((u_char *)(p))[1])
	43	#define PPP_PROTOCOL(p) ((((u_char )(p))[2] << 8) + ((u_char )(p))[3])
	44
	45	/*
	46	* Significant octet values.
	47	*/
	48	#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
	49	#define PPP_UI 0x03 /* Unnumbered Information */
	50	#define PPP_FLAG 0x7e /* Flag Sequence */
	51	#define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
	52	#define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
	53
	54	/*
	55	* Protocol field values.
	56	*/
	57	#define PPP_IP 0x21 /* Internet Protocol */
	58	#define PPP_XNS 0x25 /* Xerox NS */
	59	#define PPP_AT 0x29 /* AppleTalk Protocol */
	60	#define PPP_IPX 0x2b /* IPX Datagram (RFC1552) */
	61	#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
	62	#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
	63	#define PPP_COMP 0xfd /* compressed packet */
	64	#define PPP_IPCP 0x8021 /* IP Control Protocol */
	65	#define PPP_ATCP 0x8029 /* AppleTalk Control Protocol */
	66	#define PPP_IPXCP 0x802b /* IPX Control Protocol (RFC1552) */
	67	#define PPP_CCP 0x80fd /* Compression Control Protocol */
	68	#define PPP_LCP 0xc021 /* Link Control Protocol */
	69	#define PPP_PAP 0xc023 /* Password Authentication Protocol */
	70	#define PPP_LQR 0xc025 /* Link Quality Report protocol */
	71	#define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
	72	#define PPP_CBCP 0xc029 /* Callback Control Protocol */
	73	#define PPP_IPV6 0x57 /* Internet Protocol version 6*/
	74	#define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
	75
	76	/*
	77	* Values for FCS calculations.
	78	*/
	79	#define PPP_INITFCS 0xffff /* Initial FCS value */
	80	#define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
	81	#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
	82
	83	/*
	84	* Extended asyncmap - allows any character to be escaped.
	85	*/
	86	typedef u_int32_t ext_accm[8];
	87
	88	/*
	89	* What to do with network protocol (NP) packets.
	90	*/
	91	enum NPmode {
	92	NPMODE_PASS, /* pass the packet through */
	93	NPMODE_DROP, /* silently drop the packet */
	94	NPMODE_ERROR, /* return an error */
	95	NPMODE_QUEUE /* save it up for later. */
	96	};
	97
	98	/*
	99	* Statistics.
	100	*/
	101	struct pppstat {
	102	unsigned int ppp_ibytes; /* bytes received */
	103	unsigned int ppp_ipackets; /* packets received */
	104	unsigned int ppp_ierrors; /* receive errors */
	105	unsigned int ppp_obytes; /* bytes sent */
	106	unsigned int ppp_opackets; /* packets sent */
	107	unsigned int ppp_oerrors; /* transmit errors */
	108	};
	109
	110	struct vjstat {
	111	unsigned int vjs_packets; /* outbound packets */
	112	unsigned int vjs_compressed; /* outbound compressed packets */
	113	unsigned int vjs_searches; /* searches for connection state */
	114	unsigned int vjs_misses; /* times couldn't find conn. state */
	115	unsigned int vjs_uncompressedin; /* inbound uncompressed packets */
	116	unsigned int vjs_compressedin; /* inbound compressed packets */
	117	unsigned int vjs_errorin; /* inbound unknown type packets */
	118	unsigned int vjs_tossed; /* inbound packets tossed because of error */
	119	};
	120
	121	struct ppp_stats {
	122	struct pppstat p; /* basic PPP statistics */
	123	struct vjstat vj; /* VJ header compression statistics */
	124	};
	125
	126	struct compstat {
	127	unsigned int unc_bytes; /* total uncompressed bytes */
	128	unsigned int unc_packets; /* total uncompressed packets */
	129	unsigned int comp_bytes; /* compressed bytes */
	130	unsigned int comp_packets; /* compressed packets */
	131	unsigned int inc_bytes; /* incompressible bytes */
	132	unsigned int inc_packets; /* incompressible packets */
	133	unsigned int ratio; /* recent compression ratio << 8 */
	134	};
	135
	136	struct ppp_comp_stats {
	137	struct compstat c; /* packet compression statistics */
	138	struct compstat d; /* packet decompression statistics */
	139	};
	140
	141	/*
	142	* The following structure records the time in seconds since
	143	* the last NP packet was sent or received.
	144	*/
	145	struct ppp_idle {
	146	time_t xmit_idle; /* time since last NP packet sent */
	147	time_t recv_idle; /* time since last NP packet received */
	148	};
	149
	150
	151	#endif /* _PPP_DEFS_H_ */