Diff: lwip/netif/ppp/vj.h

Revision:

12:8dc6b255af6c

Parent:

11:da4498f591ee

--- a/lwip/netif/ppp/vj.h	Thu Aug 05 15:01:33 2010 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,156 +0,0 @@
-/*
- * Definitions for tcp compression routines.
- *
- * $Id: vj.h,v 1.7 2010/02/22 17:52:09 goldsimon Exp $
- *
- * Copyright (c) 1989 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley.  The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- *
- * Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
- * - Initial distribution.
- */
-
-#ifndef VJ_H
-#define VJ_H
-
-#include "lwip/ip.h"
-#include "lwip/tcp_impl.h"
-
-#define MAX_SLOTS 16 /* must be > 2 and < 256 */
-#define MAX_HDR   128
-
-/*
- * Compressed packet format:
- *
- * The first octet contains the packet type (top 3 bits), TCP
- * 'push' bit, and flags that indicate which of the 4 TCP sequence
- * numbers have changed (bottom 5 bits).  The next octet is a
- * conversation number that associates a saved IP/TCP header with
- * the compressed packet.  The next two octets are the TCP checksum
- * from the original datagram.  The next 0 to 15 octets are
- * sequence number changes, one change per bit set in the header
- * (there may be no changes and there are two special cases where
- * the receiver implicitly knows what changed -- see below).
- * 
- * There are 5 numbers which can change (they are always inserted
- * in the following order): TCP urgent pointer, window,
- * acknowlegement, sequence number and IP ID.  (The urgent pointer
- * is different from the others in that its value is sent, not the
- * change in value.)  Since typical use of SLIP links is biased
- * toward small packets (see comments on MTU/MSS below), changes
- * use a variable length coding with one octet for numbers in the
- * range 1 - 255 and 3 octets (0, MSB, LSB) for numbers in the
- * range 256 - 65535 or 0.  (If the change in sequence number or
- * ack is more than 65535, an uncompressed packet is sent.)
- */
-
-/*
- * Packet types (must not conflict with IP protocol version)
- *
- * The top nibble of the first octet is the packet type.  There are
- * three possible types: IP (not proto TCP or tcp with one of the
- * control flags set); uncompressed TCP (a normal IP/TCP packet but
- * with the 8-bit protocol field replaced by an 8-bit connection id --
- * this type of packet syncs the sender & receiver); and compressed
- * TCP (described above).
- *
- * LSB of 4-bit field is TCP "PUSH" bit (a worthless anachronism) and
- * is logically part of the 4-bit "changes" field that follows.  Top
- * three bits are actual packet type.  For backward compatibility
- * and in the interest of conserving bits, numbers are chosen so the
- * IP protocol version number (4) which normally appears in this nibble
- * means "IP packet".
- */
-
-/* packet types */
-#define TYPE_IP               0x40
-#define TYPE_UNCOMPRESSED_TCP 0x70
-#define TYPE_COMPRESSED_TCP   0x80
-#define TYPE_ERROR            0x00
-
-/* Bits in first octet of compressed packet */
-#define NEW_C 0x40 /* flag bits for what changed in a packet */
-#define NEW_I 0x20
-#define NEW_S 0x08
-#define NEW_A 0x04
-#define NEW_W 0x02
-#define NEW_U 0x01
-
-/* reserved, special-case values of above */
-#define SPECIAL_I (NEW_S|NEW_W|NEW_U) /* echoed interactive traffic */
-#define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U) /* unidirectional data */
-#define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U)
-
-#define TCP_PUSH_BIT 0x10
-
-
-/*
- * "state" data for each active tcp conversation on the wire.  This is
- * basically a copy of the entire IP/TCP header from the last packet
- * we saw from the conversation together with a small identifier
- * the transmit & receive ends of the line use to locate saved header.
- */
-struct cstate {
-  struct cstate *cs_next; /* next most recently used state (xmit only) */
-  u_short cs_hlen;        /* size of hdr (receive only) */
-  u_char cs_id;           /* connection # associated with this state */
-  u_char cs_filler;
-  union {
-    char csu_hdr[MAX_HDR];
-    struct ip_hdr csu_ip;     /* ip/tcp hdr from most recent packet */
-  } vjcs_u;
-};
-#define cs_ip vjcs_u.csu_ip
-#define cs_hdr vjcs_u.csu_hdr
-
-
-struct vjstat {
-  unsigned long vjs_packets;        /* outbound packets */
-  unsigned long vjs_compressed;     /* outbound compressed packets */
-  unsigned long vjs_searches;       /* searches for connection state */
-  unsigned long vjs_misses;         /* times couldn't find conn. state */
-  unsigned long vjs_uncompressedin; /* inbound uncompressed packets */
-  unsigned long vjs_compressedin;   /* inbound compressed packets */
-  unsigned long vjs_errorin;        /* inbound unknown type packets */
-  unsigned long vjs_tossed;         /* inbound packets tossed because of error */
-};
-
-/*
- * all the state data for one serial line (we need one of these per line).
- */
-struct vjcompress {
-  struct cstate *last_cs;          /* most recently used tstate */
-  u_char last_recv;                /* last rcvd conn. id */
-  u_char last_xmit;                /* last sent conn. id */
-  u_short flags;
-  u_char maxSlotIndex;
-  u_char compressSlot;             /* Flag indicating OK to compress slot ID. */
-#if LINK_STATS
-  struct vjstat stats;
-#endif
-  struct cstate tstate[MAX_SLOTS]; /* xmit connection states */
-  struct cstate rstate[MAX_SLOTS]; /* receive connection states */
-};
-
-/* flag values */
-#define VJF_TOSS 1U /* tossing rcvd frames because of input err */
-
-extern void  vj_compress_init    (struct vjcompress *comp);
-extern u_int vj_compress_tcp     (struct vjcompress *comp, struct pbuf *pb);
-extern void  vj_uncompress_err   (struct vjcompress *comp);
-extern int   vj_uncompress_uncomp(struct pbuf *nb, struct vjcompress *comp);
-extern int   vj_uncompress_tcp   (struct pbuf **nb, struct vjcompress *comp);
-
-#endif /* VJ_H */