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![Paul Mackerras](/assets/img/avatar_default.png)
This changes the copyright notices on the PPP code that I developed in the late 1990s from being copyright The Australian National University to copyright Paul Mackerras. I can do this as I have an acknowledgement in writing from the Head of the Computer Science Department at ANU (where I worked then) that ANU does not claim any intellectual property in this code. While I'm at it, change the copyright notice from BSD-style to GNU GPL like the rest of the kernel. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: David S. Miller <davem@davemloft.net>
631 lines
18 KiB
C
631 lines
18 KiB
C
/*
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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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*
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* Copyright 1994-1998 Paul Mackerras.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/ppp_defs.h>
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#include <linux/ppp-comp.h>
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#include <linux/zlib.h>
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#include <asm/unaligned.h>
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/*
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* State for a Deflate (de)compressor.
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*/
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struct ppp_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 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 *z_comp_alloc(unsigned char *options, int opt_len);
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static void *z_decomp_alloc(unsigned char *options, int opt_len);
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static void z_comp_free(void *state);
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static void z_decomp_free(void *state);
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static int z_comp_init(void *state, unsigned char *options,
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int opt_len,
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int unit, int hdrlen, int debug);
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static int z_decomp_init(void *state, unsigned char *options,
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int opt_len,
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int unit, int hdrlen, int mru, int debug);
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static int z_compress(void *state, unsigned char *rptr,
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unsigned char *obuf,
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int isize, int osize);
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static void z_incomp(void *state, unsigned char *ibuf, int icnt);
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static int z_decompress(void *state, unsigned char *ibuf,
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int isize, unsigned char *obuf, int osize);
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static void z_comp_reset(void *state);
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static void z_decomp_reset(void *state);
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static void z_comp_stats(void *state, struct compstat *stats);
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/**
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* z_comp_free - free the memory used by a compressor
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* @arg: pointer to the private state for the compressor.
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*/
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static void z_comp_free(void *arg)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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if (state) {
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zlib_deflateEnd(&state->strm);
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vfree(state->strm.workspace);
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kfree(state);
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}
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}
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/**
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* z_comp_alloc - allocate space for a compressor.
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* @options: pointer to CCP option data
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* @opt_len: length of the CCP option at @options.
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*
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* The @options pointer points to the a buffer containing the
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* CCP option data for the compression being negotiated. It is
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* formatted according to RFC1979, and describes the window
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* size that the peer is requesting that we use in compressing
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* data to be sent to it.
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*
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* Returns the pointer to the private state for the compressor,
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* or NULL if we could not allocate enough memory.
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*/
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static void *z_comp_alloc(unsigned char *options, int opt_len)
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{
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struct ppp_deflate_state *state;
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int w_size;
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if (opt_len != CILEN_DEFLATE ||
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(options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) ||
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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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state = kzalloc(sizeof(*state),
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GFP_KERNEL);
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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->w_size = w_size;
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state->strm.workspace = vmalloc(zlib_deflate_workspacesize(-w_size, 8));
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if (state->strm.workspace == NULL)
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goto out_free;
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if (zlib_deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION,
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DEFLATE_METHOD_VAL, -w_size, 8, Z_DEFAULT_STRATEGY)
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!= Z_OK)
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goto out_free;
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return (void *) state;
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out_free:
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z_comp_free(state);
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return NULL;
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}
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/**
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* z_comp_init - initialize a previously-allocated compressor.
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* @arg: pointer to the private state for the compressor
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* @options: pointer to the CCP option data describing the
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* compression that was negotiated with the peer
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* @opt_len: length of the CCP option data at @options
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* @unit: PPP unit number for diagnostic messages
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* @hdrlen: ignored (present for backwards compatibility)
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* @debug: debug flag; if non-zero, debug messages are printed.
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*
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* The CCP options described by @options must match the options
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* specified when the compressor was allocated. The compressor
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* history is reset. Returns 0 for failure (CCP options don't
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* match) or 1 for success.
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*/
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static int z_comp_init(void *arg, unsigned char *options, int opt_len,
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int unit, int hdrlen, int debug)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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if (opt_len < CILEN_DEFLATE ||
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(options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) ||
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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->debug = debug;
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zlib_deflateReset(&state->strm);
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return 1;
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}
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/**
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* z_comp_reset - reset a previously-allocated compressor.
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* @arg: pointer to private state for the compressor.
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*
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* This clears the history for the compressor and makes it
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* ready to start emitting a new compressed stream.
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*/
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static void z_comp_reset(void *arg)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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state->seqno = 0;
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zlib_deflateReset(&state->strm);
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}
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/**
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* z_compress - compress a PPP packet with Deflate compression.
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* @arg: pointer to private state for the compressor
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* @rptr: uncompressed packet (input)
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* @obuf: compressed packet (output)
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* @isize: size of uncompressed packet
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* @osize: space available at @obuf
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*
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* Returns the length of the compressed packet, or 0 if the
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* packet is incompressible.
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*/
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static int z_compress(void *arg, unsigned char *rptr, unsigned char *obuf,
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int isize, int osize)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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int r, proto, off, olen, oavail;
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unsigned char *wptr;
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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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proto = PPP_PROTOCOL(rptr);
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if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
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return 0;
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/* Don't generate compressed packets which are larger than
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the uncompressed packet. */
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if (osize > isize)
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osize = isize;
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wptr = obuf;
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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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put_unaligned_be16(PPP_COMP, wptr + 2);
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wptr += PPP_HDRLEN;
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put_unaligned_be16(state->seqno, wptr);
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wptr += DEFLATE_OVHD;
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olen = PPP_HDRLEN + DEFLATE_OVHD;
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state->strm.next_out = wptr;
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state->strm.avail_out = oavail = osize - olen;
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++state->seqno;
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off = (proto > 0xff) ? 2 : 3; /* skip 1st proto byte if 0 */
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rptr += off;
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state->strm.next_in = rptr;
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state->strm.avail_in = (isize - off);
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for (;;) {
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r = zlib_deflate(&state->strm, Z_PACKET_FLUSH);
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if (r != Z_OK) {
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if (state->debug)
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printk(KERN_ERR
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"z_compress: deflate returned %d\n", r);
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break;
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}
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if (state->strm.avail_out == 0) {
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olen += oavail;
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state->strm.next_out = NULL;
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state->strm.avail_out = oavail = 1000000;
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} else {
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break; /* all done */
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}
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}
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olen += oavail - 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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*/
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if (olen < isize) {
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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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state->stats.inc_bytes += isize;
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state->stats.inc_packets++;
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olen = 0;
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}
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state->stats.unc_bytes += isize;
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state->stats.unc_packets++;
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return olen;
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}
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/**
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* z_comp_stats - return compression statistics for a compressor
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* or decompressor.
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* @arg: pointer to private space for the (de)compressor
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* @stats: pointer to a struct compstat to receive the result.
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*/
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static void z_comp_stats(void *arg, struct compstat *stats)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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*stats = state->stats;
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}
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/**
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* z_decomp_free - Free the memory used by a decompressor.
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* @arg: pointer to private space for the decompressor.
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*/
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static void z_decomp_free(void *arg)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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if (state) {
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zlib_inflateEnd(&state->strm);
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vfree(state->strm.workspace);
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kfree(state);
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}
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}
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/**
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* z_decomp_alloc - allocate space for a decompressor.
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* @options: pointer to CCP option data
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* @opt_len: length of the CCP option at @options.
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*
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* The @options pointer points to the a buffer containing the
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* CCP option data for the compression being negotiated. It is
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* formatted according to RFC1979, and describes the window
|
|
* size that we are requesting the peer to use in compressing
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* data to be sent to us.
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*
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* Returns the pointer to the private state for the decompressor,
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* or NULL if we could not allocate enough memory.
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*/
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static void *z_decomp_alloc(unsigned char *options, int opt_len)
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{
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struct ppp_deflate_state *state;
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int w_size;
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if (opt_len != CILEN_DEFLATE ||
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(options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) ||
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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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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (state == NULL)
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return NULL;
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state->w_size = w_size;
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state->strm.next_out = NULL;
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state->strm.workspace = vmalloc(zlib_inflate_workspacesize());
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if (state->strm.workspace == NULL)
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goto out_free;
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if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK)
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goto out_free;
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return (void *) state;
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out_free:
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z_decomp_free(state);
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return NULL;
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}
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/**
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* z_decomp_init - initialize a previously-allocated decompressor.
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* @arg: pointer to the private state for the decompressor
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* @options: pointer to the CCP option data describing the
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* compression that was negotiated with the peer
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* @opt_len: length of the CCP option data at @options
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* @unit: PPP unit number for diagnostic messages
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* @hdrlen: ignored (present for backwards compatibility)
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* @mru: maximum length of decompressed packets
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* @debug: debug flag; if non-zero, debug messages are printed.
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*
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* The CCP options described by @options must match the options
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* specified when the decompressor was allocated. The decompressor
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* history is reset. Returns 0 for failure (CCP options don't
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* match) or 1 for success.
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*/
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static int z_decomp_init(void *arg, unsigned char *options, int opt_len,
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int unit, int hdrlen, int mru, int debug)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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if (opt_len < CILEN_DEFLATE ||
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(options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) ||
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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->debug = debug;
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state->mru = mru;
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zlib_inflateReset(&state->strm);
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return 1;
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}
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/**
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* z_decomp_reset - reset a previously-allocated decompressor.
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* @arg: pointer to private state for the decompressor.
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*
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* This clears the history for the decompressor and makes it
|
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* ready to receive a new compressed stream.
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*/
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static void z_decomp_reset(void *arg)
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{
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
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state->seqno = 0;
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zlib_inflateReset(&state->strm);
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}
|
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|
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/**
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* z_decompress - decompress a Deflate-compressed packet.
|
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* @arg: pointer to private state for the decompressor
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* @ibuf: pointer to input (compressed) packet data
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* @isize: length of input packet
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* @obuf: pointer to space for output (decompressed) packet
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* @osize: amount of space available at @obuf
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*
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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
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* DECOMP_FATALERROR for any errors which could possibly be said to
|
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* be being detected "after" decompression. For DECOMP_ERROR,
|
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* 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.
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|
*
|
|
* 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.
|
|
*/
|
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static int z_decompress(void *arg, unsigned char *ibuf, int isize,
|
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unsigned char *obuf, int osize)
|
|
{
|
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struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
|
|
int olen, seq, r;
|
|
int decode_proto, overflow;
|
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unsigned char overflow_buf[1];
|
|
|
|
if (isize <= PPP_HDRLEN + DEFLATE_OVHD) {
|
|
if (state->debug)
|
|
printk(KERN_DEBUG "z_decompress%d: short pkt (%d)\n",
|
|
state->unit, isize);
|
|
return DECOMP_ERROR;
|
|
}
|
|
|
|
/* Check the sequence number. */
|
|
seq = get_unaligned_be16(ibuf + PPP_HDRLEN);
|
|
if (seq != (state->seqno & 0xffff)) {
|
|
if (state->debug)
|
|
printk(KERN_DEBUG "z_decompress%d: bad seq # %d, expected %d\n",
|
|
state->unit, seq, state->seqno & 0xffff);
|
|
return DECOMP_ERROR;
|
|
}
|
|
++state->seqno;
|
|
|
|
/*
|
|
* Fill in the first part of the PPP header. The protocol field
|
|
* comes from the decompressed data.
|
|
*/
|
|
obuf[0] = PPP_ADDRESS(ibuf);
|
|
obuf[1] = PPP_CONTROL(ibuf);
|
|
obuf[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 = ibuf + PPP_HDRLEN + DEFLATE_OVHD;
|
|
state->strm.avail_in = isize - (PPP_HDRLEN + DEFLATE_OVHD);
|
|
state->strm.next_out = obuf + 3;
|
|
state->strm.avail_out = 1;
|
|
decode_proto = 1;
|
|
overflow = 0;
|
|
|
|
/*
|
|
* Call inflate, supplying more input or output as needed.
|
|
*/
|
|
for (;;) {
|
|
r = zlib_inflate(&state->strm, Z_PACKET_FLUSH);
|
|
if (r != Z_OK) {
|
|
if (state->debug)
|
|
printk(KERN_DEBUG "z_decompress%d: inflate returned %d (%s)\n",
|
|
state->unit, r, (state->strm.msg? state->strm.msg: ""));
|
|
return DECOMP_FATALERROR;
|
|
}
|
|
if (state->strm.avail_out != 0)
|
|
break; /* all done */
|
|
if (decode_proto) {
|
|
state->strm.avail_out = osize - PPP_HDRLEN;
|
|
if ((obuf[3] & 1) == 0) {
|
|
/* 2-byte protocol field */
|
|
obuf[2] = obuf[3];
|
|
--state->strm.next_out;
|
|
++state->strm.avail_out;
|
|
}
|
|
decode_proto = 0;
|
|
} else if (!overflow) {
|
|
/*
|
|
* We've filled up the output buffer; the only way to
|
|
* find out whether inflate has any more characters
|
|
* left is to give it another byte of output space.
|
|
*/
|
|
state->strm.next_out = overflow_buf;
|
|
state->strm.avail_out = 1;
|
|
overflow = 1;
|
|
} else {
|
|
if (state->debug)
|
|
printk(KERN_DEBUG "z_decompress%d: ran out of mru\n",
|
|
state->unit);
|
|
return DECOMP_FATALERROR;
|
|
}
|
|
}
|
|
|
|
if (decode_proto) {
|
|
if (state->debug)
|
|
printk(KERN_DEBUG "z_decompress%d: didn't get proto\n",
|
|
state->unit);
|
|
return DECOMP_ERROR;
|
|
}
|
|
|
|
olen = osize + overflow - state->strm.avail_out;
|
|
state->stats.unc_bytes += olen;
|
|
state->stats.unc_packets++;
|
|
state->stats.comp_bytes += isize;
|
|
state->stats.comp_packets++;
|
|
|
|
return olen;
|
|
}
|
|
|
|
/**
|
|
* z_incomp - add incompressible input data to the history.
|
|
* @arg: pointer to private state for the decompressor
|
|
* @ibuf: pointer to input packet data
|
|
* @icnt: length of input data.
|
|
*/
|
|
static void z_incomp(void *arg, unsigned char *ibuf, int icnt)
|
|
{
|
|
struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
|
|
int proto, r;
|
|
|
|
/*
|
|
* Check that the protocol is one we handle.
|
|
*/
|
|
proto = PPP_PROTOCOL(ibuf);
|
|
if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
|
|
return;
|
|
|
|
++state->seqno;
|
|
|
|
/*
|
|
* We start at the either the 1st or 2nd byte of the protocol field,
|
|
* depending on whether the protocol value is compressible.
|
|
*/
|
|
state->strm.next_in = ibuf + 3;
|
|
state->strm.avail_in = icnt - 3;
|
|
if (proto > 0xff) {
|
|
--state->strm.next_in;
|
|
++state->strm.avail_in;
|
|
}
|
|
|
|
r = zlib_inflateIncomp(&state->strm);
|
|
if (r != Z_OK) {
|
|
/* gak! */
|
|
if (state->debug) {
|
|
printk(KERN_DEBUG "z_incomp%d: inflateIncomp returned %d (%s)\n",
|
|
state->unit, r, (state->strm.msg? state->strm.msg: ""));
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Update stats.
|
|
*/
|
|
state->stats.inc_bytes += icnt;
|
|
state->stats.inc_packets++;
|
|
state->stats.unc_bytes += icnt;
|
|
state->stats.unc_packets++;
|
|
}
|
|
|
|
/*************************************************************
|
|
* Module interface table
|
|
*************************************************************/
|
|
|
|
/* These are in ppp_generic.c */
|
|
extern int ppp_register_compressor (struct compressor *cp);
|
|
extern void ppp_unregister_compressor (struct compressor *cp);
|
|
|
|
/*
|
|
* Procedures exported to if_ppp.c.
|
|
*/
|
|
static struct compressor ppp_deflate = {
|
|
.compress_proto = CI_DEFLATE,
|
|
.comp_alloc = z_comp_alloc,
|
|
.comp_free = z_comp_free,
|
|
.comp_init = z_comp_init,
|
|
.comp_reset = z_comp_reset,
|
|
.compress = z_compress,
|
|
.comp_stat = z_comp_stats,
|
|
.decomp_alloc = z_decomp_alloc,
|
|
.decomp_free = z_decomp_free,
|
|
.decomp_init = z_decomp_init,
|
|
.decomp_reset = z_decomp_reset,
|
|
.decompress = z_decompress,
|
|
.incomp = z_incomp,
|
|
.decomp_stat = z_comp_stats,
|
|
.owner = THIS_MODULE
|
|
};
|
|
|
|
static struct compressor ppp_deflate_draft = {
|
|
.compress_proto = CI_DEFLATE_DRAFT,
|
|
.comp_alloc = z_comp_alloc,
|
|
.comp_free = z_comp_free,
|
|
.comp_init = z_comp_init,
|
|
.comp_reset = z_comp_reset,
|
|
.compress = z_compress,
|
|
.comp_stat = z_comp_stats,
|
|
.decomp_alloc = z_decomp_alloc,
|
|
.decomp_free = z_decomp_free,
|
|
.decomp_init = z_decomp_init,
|
|
.decomp_reset = z_decomp_reset,
|
|
.decompress = z_decompress,
|
|
.incomp = z_incomp,
|
|
.decomp_stat = z_comp_stats,
|
|
.owner = THIS_MODULE
|
|
};
|
|
|
|
static int __init deflate_init(void)
|
|
{
|
|
int answer = ppp_register_compressor(&ppp_deflate);
|
|
if (answer == 0)
|
|
printk(KERN_INFO
|
|
"PPP Deflate Compression module registered\n");
|
|
ppp_register_compressor(&ppp_deflate_draft);
|
|
return answer;
|
|
}
|
|
|
|
static void __exit deflate_cleanup(void)
|
|
{
|
|
ppp_unregister_compressor(&ppp_deflate);
|
|
ppp_unregister_compressor(&ppp_deflate_draft);
|
|
}
|
|
|
|
module_init(deflate_init);
|
|
module_exit(deflate_cleanup);
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_ALIAS("ppp-compress-" __stringify(CI_DEFLATE));
|
|
MODULE_ALIAS("ppp-compress-" __stringify(CI_DEFLATE_DRAFT));
|