257 lines
7 KiB
C
257 lines
7 KiB
C
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#ifndef _VJSLIP_
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#define _VJSLIP_
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/*
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* Copyright (c) 1989 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are
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* permitted provided that the above copyright notice and this
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* paragraph are duplicated in all such forms and that any
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* documentation, advertising materials, and other materials
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* related to such distribution and use acknowledge that the
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* software was developed by the University of California,
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* Berkeley. The name of the University may not be used to
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* endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
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* IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE.
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*/
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// A.1 Definitions and State Data
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#define MAX_VJ_STATES 16 /* must be >2 and <255 */
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#define MAX_HDR 128 /* max TCP+IP hdr length (by protocol def) */
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//
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// NT is little endian, so we follow these rules
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//
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#if (defined(_M_IX86) && (_MSC_FULL_VER > 13009037)) || ((defined(_M_AMD64) || defined(_M_IA64)) && (_MSC_FULL_VER > 13009175))
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#define ntohs(x) _byteswap_ushort((USHORT)(x))
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#define ntohl(x) _byteswap_ulong((ULONG)(x))
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#else
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#define ntohs(x) (USHORT)( ((x) >> 8) + (((x) & 0xFF) << 8) )
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#define ntohl(x) (ULONG) ( ((x) >> 24) + (((x) & 0xFF0000) >> 8) +\
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(((x) & 0xFF00) << 8) + (((x) & 0xFF) << 24) )
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#endif
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#define htons(x) ntohs(x)
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#define htonl(x) ntohl(x)
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/* packet types */
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#define TYPE_IP 0x40
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#define TYPE_UNCOMPRESSED_TCP 0x70
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#define TYPE_COMPRESSED_TCP 0x80
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#define TYPE_ERROR 0x00
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/* this is not a type that ever appears on
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* the wire. The receive framer uses it to
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* tell the decompressor there was a packet
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* transmission error. */
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/*
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* Bits in first octet of compressed packet
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*/
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/* flag bits for what changed in a packet */
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#define NEW_C 0x40
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#define NEW_I 0x20
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#define TCP_PUSH_BIT 0x10
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#define NEW_S 0x08
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#define NEW_A 0x04
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#define NEW_W 0x02
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#define NEW_U 0x01
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/* reserved, special-case values of above */
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#define SPECIAL_I (NEW_S|NEW_W|NEW_U) /* echoed interactive traffic */
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#define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U) /* unidirectional data */
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#define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U)
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/*
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* "state" data for each active tcp conversation on the wire. This is
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* basically a copy of the entire IP/TCP header from the last packet together
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* with a small identifier the transmit & receive ends of the line use to
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* locate saved header.
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*/
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struct cstate {
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struct cstate *cs_next; /* next most recently used cstate (xmit only) */
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USHORT cs_hlen; /* size of hdr (receive only) */
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UCHAR cs_id; /* connection # associated with this state */
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UCHAR cs_filler;
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union {
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UCHAR hdr[MAX_HDR];
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struct ip_v4 csu_ip; /* ip/tcp hdr from most recent packet */
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} slcs_u;
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};
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#define cs_ip slcs_u.csu_ip
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#define cs_hdr slcs_u.csu_hdr
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/*
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* all the state data for one serial line (we need one of these per line).
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*/
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typedef struct slcompress slcompress;
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struct slcompress {
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struct cstate *last_cs; /* most recently used tstate */
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UCHAR last_recv; /* last rcvd conn. id */
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UCHAR last_xmit; /* last sent conn. id */
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USHORT flags;
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UCHAR MaxStates;
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//
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// Some Statistics
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//
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ULONG OutPackets;
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ULONG OutCompressed;
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ULONG OutSearches;
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ULONG OutMisses;
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ULONG InUncompressed;
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ULONG InCompressed;
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ULONG InErrors;
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ULONG InTossed;
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struct cstate tstate[MAX_VJ_STATES]; /* xmit connection states */
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struct cstate rstate[MAX_VJ_STATES]; /* receive connection states */
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};
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struct mbuf {
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PUCHAR m_off; // pointer to start of data
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UINT m_len; // length of data
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};
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#define mtod(m,t) ((t)(m->m_off))
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/* flag values */
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#define SLF_TOSS 1 /* tossing rcvd frames because of input err */
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/*
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* The following macros are used to encode and decode numbers. They all
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* assume that `cp' points to a buffer where the next byte encoded (decoded)
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* is to be stored (retrieved). Since the decode routines do arithmetic,
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* they have to convert from and to network byte order.
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*/
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/*
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* ENCODE encodes a number that is known to be non-zero. ENCODEZ checks for
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* zero (zero has to be encoded in the long, 3 byte form).
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*/
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#define ENCODE(n) { \
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if ((USHORT)(n) >= 256) { \
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*cp++ = 0; \
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cp[1] = (UCHAR)(n); \
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cp[0] = (UCHAR)((n) >> 8); \
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cp += 2; \
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} else { \
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*cp++ = (UCHAR)(n); \
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} \
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}
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#define ENCODEZ(n) { \
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if ((USHORT)(n) >= 256 || (USHORT)(n) == 0) { \
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*cp++ = 0; \
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cp[1] = (UCHAR)(n); \
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cp[0] = (UCHAR)((n) >> 8); \
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cp += 2; \
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} else { \
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*cp++ = (UCHAR)(n); \
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} \
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}
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/*
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* DECODEL takes the (compressed) change at byte cp and adds it to the
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* current value of packet field 'f' (which must be a 4-byte (long) integer
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* in network byte order). DECODES does the same for a 2-byte (short) field.
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* DECODEU takes the change at cp and stuffs it into the (short) field f.
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* 'cp' is updated to point to the next field in the compressed header.
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*/
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#define DECODEL(f) { \
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ULONG _x_ = ntohl(f); \
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if (*cp == 0) {\
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_x_ += ((cp[1] << 8) + cp[2]); \
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(f) = htonl(_x_); \
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cp += 3; \
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} else { \
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_x_ += *cp; \
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(f) = htonl(_x_); \
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cp++; \
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} \
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}
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#define DECODES(f) { \
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USHORT _x_= ntohs(f); \
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if (*cp == 0) {\
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_x_ += ((cp[1] << 8) + cp[2]); \
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(f) = htons(_x_); \
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cp += 3; \
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} else { \
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_x_ += *cp; \
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(f) = htons(_x_); \
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cp++; \
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} \
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}
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#define DECODEU(f) { \
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USHORT _x_; \
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if (*cp == 0) {\
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_x_=(cp[1] << 8) + cp[2]; \
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(f) = htons(_x_); \
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cp += 3; \
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} else { \
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_x_=*cp; \
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(f) = htons(_x_); \
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cp++; \
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} \
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}
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typedef UCHAR UNALIGNED * PUUCHAR;
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UCHAR
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sl_compress_tcp(
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PUUCHAR UNALIGNED *m_off, // Frame start (points to IP header)
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PULONG m_len, // Length of entire frame
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PULONG precomph_len, // Length of tcp/ip header pre-comp
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PULONG postcomph_len, // Length of tcp/ip header post-comp
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struct slcompress *comp, // Compression struct for this link
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ULONG compress_cid); // Compress connection id boolean
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//LONG
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//sl_uncompress_tcp(
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// PUUCHAR UNALIGNED *bufp,
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// LONG len,
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// UCHAR type,
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// struct slcompress *comp);
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LONG
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sl_uncompress_tcp(
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PUUCHAR UNALIGNED *InBuffer,
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PLONG InLength,
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UCHAR UNALIGNED *OutBuffer,
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PLONG OutLength,
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UCHAR type,
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struct slcompress *comp
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);
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NDIS_STATUS
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sl_compress_init(
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struct slcompress **comp,
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UCHAR MaxStates);
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VOID
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sl_compress_terminate(
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struct slcompress **comp
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);
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#endif // _VJSLIP_
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