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Paul Mackerras
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@ -1,653 +0,0 @@
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/* $Id: ppp-deflate.c,v 1.1 1996/07/01 01:00:30 paulus Exp $ */
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/*
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* ppp_deflate.c - interface the zlib procedures for Deflate compression
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* and decompression (as used by gzip) to the PPP code.
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* This version is for use with mbufs on BSD-derived systems.
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*
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* Copyright (c) 1994 The Australian National University.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied. The Australian National University
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* makes no representations about the suitability of this software for
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* any purpose.
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*
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* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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* THE AUSTRALIAN NATIONAL UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
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* OR MODIFICATIONS.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <net/ppp_defs.h>
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#include <net/zlib.h>
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#define PACKETPTR struct mbuf *
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#include <net/ppp-comp.h>
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#if DO_DEFLATE
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/*
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* State for a Deflate (de)compressor.
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*/
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struct deflate_state {
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int seqno;
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int w_size;
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int unit;
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int hdrlen;
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int mru;
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int debug;
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z_stream strm;
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struct compstat stats;
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};
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#define DEFLATE_OVHD 2 /* Deflate overhead/packet */
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static void *zalloc __P((void *, u_int items, u_int size));
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static void zfree __P((void *, void *ptr, u_int nb));
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static void *z_comp_alloc __P((u_char *options, int opt_len));
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static void *z_decomp_alloc __P((u_char *options, int opt_len));
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static void z_comp_free __P((void *state));
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static void z_decomp_free __P((void *state));
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static int z_comp_init __P((void *state, u_char *options, int opt_len,
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int unit, int hdrlen, int debug));
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static int z_decomp_init __P((void *state, u_char *options, int opt_len,
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int unit, int hdrlen, int mru, int debug));
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static int z_compress __P((void *state, struct mbuf **mret,
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struct mbuf *mp, int slen, int maxolen));
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static void z_incomp __P((void *state, struct mbuf *dmsg));
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static int z_decompress __P((void *state, struct mbuf *cmp,
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struct mbuf **dmpp));
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static void z_comp_reset __P((void *state));
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static void z_decomp_reset __P((void *state));
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static void z_comp_stats __P((void *state, struct compstat *stats));
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/*
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* Procedures exported to if_ppp.c.
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*/
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struct compressor ppp_deflate = {
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CI_DEFLATE, /* compress_proto */
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z_comp_alloc, /* comp_alloc */
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z_comp_free, /* comp_free */
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z_comp_init, /* comp_init */
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z_comp_reset, /* comp_reset */
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z_compress, /* compress */
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z_comp_stats, /* comp_stat */
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z_decomp_alloc, /* decomp_alloc */
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z_decomp_free, /* decomp_free */
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z_decomp_init, /* decomp_init */
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z_decomp_reset, /* decomp_reset */
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z_decompress, /* decompress */
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z_incomp, /* incomp */
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z_comp_stats, /* decomp_stat */
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};
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/*
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* Space allocation and freeing routines for use by zlib routines.
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*/
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void *
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zalloc(notused, items, size)
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void *notused;
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u_int items, size;
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{
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void *ptr;
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MALLOC(ptr, void *, items * size, M_DEVBUF, M_NOWAIT);
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return ptr;
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}
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void
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zfree(notused, ptr, nbytes)
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void *notused;
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void *ptr;
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u_int nbytes;
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{
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FREE(ptr, M_DEVBUF);
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}
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/*
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* Allocate space for a compressor.
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*/
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static void *
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z_comp_alloc(options, opt_len)
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u_char *options;
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int opt_len;
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{
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struct deflate_state *state;
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int w_size;
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if (opt_len != CILEN_DEFLATE || options[0] != CI_DEFLATE
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|| options[1] != CILEN_DEFLATE
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|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
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|| options[3] != DEFLATE_CHK_SEQUENCE)
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return NULL;
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w_size = DEFLATE_SIZE(options[2]);
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if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
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return NULL;
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MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
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M_DEVBUF, M_NOWAIT);
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if (state == NULL)
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return NULL;
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state->strm.next_in = NULL;
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state->strm.zalloc = zalloc;
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state->strm.zfree = zfree;
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if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL,
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-w_size, 8, Z_DEFAULT_STRATEGY, DEFLATE_OVHD+2) != Z_OK) {
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FREE(state, M_DEVBUF);
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return NULL;
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}
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state->w_size = w_size;
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bzero(&state->stats, sizeof(state->stats));
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return (void *) state;
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}
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static void
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z_comp_free(arg)
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void *arg;
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{
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struct deflate_state *state = (struct deflate_state *) arg;
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deflateEnd(&state->strm);
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FREE(state, M_DEVBUF);
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}
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static int
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z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
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void *arg;
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u_char *options;
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int opt_len, unit, hdrlen, debug;
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{
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struct deflate_state *state = (struct deflate_state *) arg;
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if (opt_len < CILEN_DEFLATE || options[0] != CI_DEFLATE
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|| options[1] != CILEN_DEFLATE
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|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
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|| DEFLATE_SIZE(options[2]) != state->w_size
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|| options[3] != DEFLATE_CHK_SEQUENCE)
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return 0;
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state->seqno = 0;
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state->unit = unit;
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state->hdrlen = hdrlen;
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state->debug = debug;
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deflateReset(&state->strm);
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return 1;
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}
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static void
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z_comp_reset(arg)
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void *arg;
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{
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struct deflate_state *state = (struct deflate_state *) arg;
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state->seqno = 0;
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deflateReset(&state->strm);
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}
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int
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z_compress(arg, mret, mp, orig_len, maxolen)
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void *arg;
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struct mbuf **mret; /* compressed packet (out) */
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struct mbuf *mp; /* uncompressed packet (in) */
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int orig_len, maxolen;
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{
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struct deflate_state *state = (struct deflate_state *) arg;
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u_char *rptr, *wptr;
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int proto, olen, wspace, r, flush;
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struct mbuf *m;
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/*
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* Check that the protocol is in the range we handle.
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*/
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rptr = mtod(mp, u_char *);
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proto = PPP_PROTOCOL(rptr);
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if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) {
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*mret = NULL;
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return orig_len;
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}
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/* Allocate one mbuf initially. */
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if (maxolen > orig_len)
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maxolen = orig_len;
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MGET(m, M_DONTWAIT, MT_DATA);
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*mret = m;
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if (m != NULL) {
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m->m_len = 0;
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if (maxolen + state->hdrlen > MLEN)
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MCLGET(m, M_DONTWAIT);
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wspace = M_TRAILINGSPACE(m);
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if (state->hdrlen + PPP_HDRLEN + 2 < wspace) {
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m->m_data += state->hdrlen;
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wspace -= state->hdrlen;
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}
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wptr = mtod(m, u_char *);
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/*
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* Copy over the PPP header and store the 2-byte sequence number.
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*/
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wptr[0] = PPP_ADDRESS(rptr);
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wptr[1] = PPP_CONTROL(rptr);
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wptr[2] = PPP_COMP >> 8;
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wptr[3] = PPP_COMP;
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wptr += PPP_HDRLEN;
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wptr[0] = state->seqno >> 8;
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wptr[1] = state->seqno;
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wptr += 2;
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state->strm.next_out = wptr;
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state->strm.avail_out = wspace - (PPP_HDRLEN + 2);
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} else {
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state->strm.next_out = NULL;
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state->strm.avail_out = 1000000;
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wptr = NULL;
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wspace = 0;
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}
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++state->seqno;
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rptr += (proto > 0xff)? 2: 3; /* skip 1st proto byte if 0 */
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state->strm.next_in = rptr;
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state->strm.avail_in = mtod(mp, u_char *) + mp->m_len - rptr;
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mp = mp->m_next;
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flush = (mp == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
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olen = 0;
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for (;;) {
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r = deflate(&state->strm, flush);
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if (r != Z_OK) {
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printf("z_compress: deflate returned %d (%s)\n",
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r, (state->strm.msg? state->strm.msg: ""));
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break;
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}
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if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
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break; /* all done */
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if (state->strm.avail_in == 0 && mp != NULL) {
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state->strm.next_in = mtod(mp, u_char *);
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state->strm.avail_in = mp->m_len;
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mp = mp->m_next;
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if (mp == NULL)
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flush = Z_PACKET_FLUSH;
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}
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if (state->strm.avail_out == 0) {
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if (m != NULL) {
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m->m_len = wspace;
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olen += wspace;
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MGET(m->m_next, M_DONTWAIT, MT_DATA);
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m = m->m_next;
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if (m != NULL) {
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m->m_len = 0;
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if (maxolen - olen > MLEN)
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MCLGET(m, M_DONTWAIT);
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state->strm.next_out = mtod(m, u_char *);
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state->strm.avail_out = wspace = M_TRAILINGSPACE(m);
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}
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}
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if (m == NULL) {
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state->strm.next_out = NULL;
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state->strm.avail_out = 1000000;
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}
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}
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}
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if (m != NULL)
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olen += (m->m_len = wspace - state->strm.avail_out);
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/*
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* See if we managed to reduce the size of the packet.
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* If the compressor just gave us a single zero byte, it means
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* the packet was incompressible.
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*/
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if (m != NULL && olen < orig_len
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&& !(olen == PPP_HDRLEN + 3 && *wptr == 0)) {
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state->stats.comp_bytes += olen;
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state->stats.comp_packets++;
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} else {
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if (*mret != NULL) {
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m_freem(*mret);
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*mret = NULL;
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}
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state->stats.inc_bytes += orig_len;
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state->stats.inc_packets++;
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olen = orig_len;
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}
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state->stats.unc_bytes += orig_len;
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state->stats.unc_packets++;
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return olen;
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}
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static void
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z_comp_stats(arg, stats)
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void *arg;
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struct compstat *stats;
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{
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struct deflate_state *state = (struct deflate_state *) arg;
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u_int out;
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*stats = state->stats;
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stats->ratio = stats->unc_bytes;
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out = stats->comp_bytes + stats->inc_bytes;
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if (stats->ratio <= 0x7ffffff)
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stats->ratio <<= 8;
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else
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out >>= 8;
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if (out != 0)
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stats->ratio /= out;
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}
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/*
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* Allocate space for a decompressor.
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*/
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static void *
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z_decomp_alloc(options, opt_len)
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u_char *options;
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int opt_len;
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{
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struct deflate_state *state;
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int w_size;
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if (opt_len != CILEN_DEFLATE || options[0] != CI_DEFLATE
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|| options[1] != CILEN_DEFLATE
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|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
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|| options[3] != DEFLATE_CHK_SEQUENCE)
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return NULL;
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w_size = DEFLATE_SIZE(options[2]);
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if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
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return NULL;
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MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
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M_DEVBUF, M_NOWAIT);
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if (state == NULL)
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return NULL;
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||||
state->strm.next_out = NULL;
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state->strm.zalloc = zalloc;
|
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state->strm.zfree = zfree;
|
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if (inflateInit2(&state->strm, -w_size) != Z_OK) {
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FREE(state, M_DEVBUF);
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return NULL;
|
||||
}
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||||
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||||
state->w_size = w_size;
|
||||
bzero(&state->stats, sizeof(state->stats));
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return (void *) state;
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}
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||||
static void
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z_decomp_free(arg)
|
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void *arg;
|
||||
{
|
||||
struct deflate_state *state = (struct deflate_state *) arg;
|
||||
|
||||
inflateEnd(&state->strm);
|
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FREE(state, M_DEVBUF);
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}
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||||
static int
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z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
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void *arg;
|
||||
u_char *options;
|
||||
int opt_len, unit, hdrlen, mru, debug;
|
||||
{
|
||||
struct deflate_state *state = (struct deflate_state *) arg;
|
||||
|
||||
if (opt_len < CILEN_DEFLATE || options[0] != CI_DEFLATE
|
||||
|| options[1] != CILEN_DEFLATE
|
||||
|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
|
||||
|| DEFLATE_SIZE(options[2]) != state->w_size
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||||
|| options[3] != DEFLATE_CHK_SEQUENCE)
|
||||
return 0;
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||||
|
||||
state->seqno = 0;
|
||||
state->unit = unit;
|
||||
state->hdrlen = hdrlen;
|
||||
state->debug = debug;
|
||||
state->mru = mru;
|
||||
|
||||
inflateReset(&state->strm);
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||||
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||||
return 1;
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||||
}
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||||
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||||
static void
|
||||
z_decomp_reset(arg)
|
||||
void *arg;
|
||||
{
|
||||
struct deflate_state *state = (struct deflate_state *) arg;
|
||||
|
||||
state->seqno = 0;
|
||||
inflateReset(&state->strm);
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||||
}
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||||
|
||||
/*
|
||||
* Decompress a Deflate-compressed packet.
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||||
*
|
||||
* Because of patent problems, we return DECOMP_ERROR for errors
|
||||
* found by inspecting the input data and for system problems, but
|
||||
* DECOMP_FATALERROR for any errors which could possibly be said to
|
||||
* be being detected "after" decompression. For DECOMP_ERROR,
|
||||
* we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be
|
||||
* infringing a patent of Motorola's if we do, so we take CCP down
|
||||
* instead.
|
||||
*
|
||||
* Given that the frame has the correct sequence number and a good FCS,
|
||||
* errors such as invalid codes in the input most likely indicate a
|
||||
* bug, so we return DECOMP_FATALERROR for them in order to turn off
|
||||
* compression, even though they are detected by inspecting the input.
|
||||
*/
|
||||
int
|
||||
z_decompress(arg, mi, mop)
|
||||
void *arg;
|
||||
struct mbuf *mi, **mop;
|
||||
{
|
||||
struct deflate_state *state = (struct deflate_state *) arg;
|
||||
struct mbuf *mo, *mo_head;
|
||||
u_char *rptr, *wptr;
|
||||
int rlen, olen, ospace;
|
||||
int seq, i, flush, r, decode_proto;
|
||||
u_char hdr[PPP_HDRLEN + DEFLATE_OVHD];
|
||||
|
||||
*mop = NULL;
|
||||
rptr = mtod(mi, u_char *);
|
||||
rlen = mi->m_len;
|
||||
for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i) {
|
||||
while (rlen <= 0) {
|
||||
mi = mi->m_next;
|
||||
if (mi == NULL)
|
||||
return DECOMP_ERROR;
|
||||
rptr = mtod(mi, u_char *);
|
||||
rlen = mi->m_len;
|
||||
}
|
||||
hdr[i] = *rptr++;
|
||||
--rlen;
|
||||
}
|
||||
|
||||
/* Check the sequence number. */
|
||||
seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1];
|
||||
if (seq != state->seqno) {
|
||||
if (state->debug)
|
||||
printf("z_decompress%d: bad seq # %d, expected %d\n",
|
||||
state->unit, seq, state->seqno);
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
++state->seqno;
|
||||
|
||||
/* Allocate an output mbuf. */
|
||||
MGETHDR(mo, M_DONTWAIT, MT_DATA);
|
||||
if (mo == NULL)
|
||||
return DECOMP_ERROR;
|
||||
mo_head = mo;
|
||||
mo->m_len = 0;
|
||||
mo->m_next = NULL;
|
||||
MCLGET(mo, M_DONTWAIT);
|
||||
ospace = M_TRAILINGSPACE(mo);
|
||||
if (state->hdrlen + PPP_HDRLEN < ospace) {
|
||||
mo->m_data += state->hdrlen;
|
||||
ospace -= state->hdrlen;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fill in the first part of the PPP header. The protocol field
|
||||
* comes from the decompressed data.
|
||||
*/
|
||||
wptr = mtod(mo, u_char *);
|
||||
wptr[0] = PPP_ADDRESS(hdr);
|
||||
wptr[1] = PPP_CONTROL(hdr);
|
||||
wptr[2] = 0;
|
||||
|
||||
/*
|
||||
* Set up to call inflate. We set avail_out to 1 initially so we can
|
||||
* look at the first byte of the output and decide whether we have
|
||||
* a 1-byte or 2-byte protocol field.
|
||||
*/
|
||||
state->strm.next_in = rptr;
|
||||
state->strm.avail_in = rlen;
|
||||
mi = mi->m_next;
|
||||
flush = (mi == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
|
||||
rlen += PPP_HDRLEN + DEFLATE_OVHD;
|
||||
state->strm.next_out = wptr + 3;
|
||||
state->strm.avail_out = 1;
|
||||
decode_proto = 1;
|
||||
olen = PPP_HDRLEN;
|
||||
|
||||
/*
|
||||
* Call inflate, supplying more input or output as needed.
|
||||
*/
|
||||
for (;;) {
|
||||
r = inflate(&state->strm, flush);
|
||||
if (r != Z_OK) {
|
||||
if (state->debug)
|
||||
printf("z_decompress%d: inflate returned %d (%s)\n",
|
||||
state->unit, r, (state->strm.msg? state->strm.msg: ""));
|
||||
m_freem(mo_head);
|
||||
return DECOMP_FATALERROR;
|
||||
}
|
||||
if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
|
||||
break; /* all done */
|
||||
if (state->strm.avail_in == 0 && mi != NULL) {
|
||||
state->strm.next_in = mtod(mi, u_char *);
|
||||
state->strm.avail_in = mi->m_len;
|
||||
rlen += mi->m_len;
|
||||
mi = mi->m_next;
|
||||
if (mi == NULL)
|
||||
flush = Z_PACKET_FLUSH;
|
||||
}
|
||||
if (state->strm.avail_out == 0) {
|
||||
if (decode_proto) {
|
||||
state->strm.avail_out = ospace - PPP_HDRLEN;
|
||||
if ((wptr[3] & 1) == 0) {
|
||||
/* 2-byte protocol field */
|
||||
wptr[2] = wptr[3];
|
||||
--state->strm.next_out;
|
||||
++state->strm.avail_out;
|
||||
--olen;
|
||||
}
|
||||
decode_proto = 0;
|
||||
} else {
|
||||
mo->m_len = ospace;
|
||||
olen += ospace;
|
||||
MGET(mo->m_next, M_DONTWAIT, MT_DATA);
|
||||
mo = mo->m_next;
|
||||
if (mo == NULL) {
|
||||
m_freem(mo_head);
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
MCLGET(mo, M_DONTWAIT);
|
||||
state->strm.next_out = mtod(mo, u_char *);
|
||||
state->strm.avail_out = ospace = M_TRAILINGSPACE(mo);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (decode_proto) {
|
||||
m_freem(mo_head);
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
olen += (mo->m_len = ospace - state->strm.avail_out);
|
||||
|
||||
state->stats.unc_bytes += olen;
|
||||
state->stats.unc_packets++;
|
||||
state->stats.comp_bytes += rlen;
|
||||
state->stats.comp_packets++;
|
||||
|
||||
*mop = mo_head;
|
||||
return DECOMP_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* Incompressible data has arrived - add it to the history.
|
||||
*/
|
||||
static void
|
||||
z_incomp(arg, mi)
|
||||
void *arg;
|
||||
struct mbuf *mi;
|
||||
{
|
||||
struct deflate_state *state = (struct deflate_state *) arg;
|
||||
u_char *rptr;
|
||||
int rlen, proto, r;
|
||||
|
||||
/*
|
||||
* Check that the protocol is one we handle.
|
||||
*/
|
||||
rptr = mtod(mi, u_char *);
|
||||
proto = PPP_PROTOCOL(rptr);
|
||||
if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
|
||||
return;
|
||||
|
||||
++state->seqno;
|
||||
|
||||
/*
|
||||
* Iterate through the mbufs, adding the characters in them
|
||||
* to the decompressor's history. For the first mbuf, we start
|
||||
* at the either the 1st or 2nd byte of the protocol field,
|
||||
* depending on whether the protocol value is compressible.
|
||||
*/
|
||||
rlen = mi->m_len;
|
||||
state->strm.next_in = rptr + 3;
|
||||
state->strm.avail_in = rlen - 3;
|
||||
if (proto > 0xff) {
|
||||
--state->strm.next_in;
|
||||
++state->strm.avail_in;
|
||||
}
|
||||
for (;;) {
|
||||
r = inflateIncomp(&state->strm);
|
||||
if (r != Z_OK) {
|
||||
/* gak! */
|
||||
if (state->debug) {
|
||||
printf("z_incomp%d: inflateIncomp returned %d (%s)\n",
|
||||
state->unit, r, (state->strm.msg? state->strm.msg: ""));
|
||||
}
|
||||
return;
|
||||
}
|
||||
mi = mi->m_next;
|
||||
if (mi == NULL)
|
||||
break;
|
||||
state->strm.next_in = mtod(mi, u_char *);
|
||||
state->strm.avail_in = mi->m_len;
|
||||
rlen += mi->m_len;
|
||||
}
|
||||
|
||||
/*
|
||||
* Update stats.
|
||||
*/
|
||||
state->stats.inc_bytes += rlen;
|
||||
state->stats.inc_packets++;
|
||||
state->stats.unc_bytes += rlen;
|
||||
state->stats.unc_packets++;
|
||||
}
|
||||
|
||||
#endif /* DO_DEFLATE */
|
||||
Loading…
Reference in New Issue
Block a user