--- /dev/null
+/*
+ * ==FILEVERSION 960302==
+ *
+ * ppp_deflate.c - interface the zlib procedures for Deflate compression
+ * and decompression (as used by gzip) to the PPP code.
+ * This version is for use with Linux kernel 1.3.X.
+ *
+ * Copyright (c) 1994 The Australian National University.
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation is hereby granted, provided that the above copyright
+ * notice appears in all copies. This software is provided without any
+ * warranty, express or implied. The Australian National University
+ * makes no representations about the suitability of this software for
+ * any purpose.
+ *
+ * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
+ * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
+ * THE AUSTRALIAN NATIONAL UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
+ * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
+ * OR MODIFICATIONS.
+ *
+ * From: deflate.c,v 1.1 1996/01/18 03:17:48 paulus Exp
+ */
+
+#include <linux/module.h>
+
+#include <endian.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/malloc.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/sched.h> /* to get the struct task_struct */
+#include <linux/string.h> /* used in new tty drivers */
+#include <linux/signal.h> /* used in new tty drivers */
+
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/segment.h>
+
+#include <net/if.h>
+
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/inet.h>
+#include <linux/ioctl.h>
+
+#include <linux/ppp_defs.h>
+
+#ifdef NEW_SKBUFF
+#include <linux/netprotocol.h>
+#endif
+
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <net/if_arp.h>
+
+#undef PACKETPTR
+#define PACKETPTR 1
+#include <linux/ppp-comp.h>
+#undef PACKETPTR
+
+#include "zlib.c"
+
+/*
+ * State for a Deflate (de)compressor.
+ */
+struct ppp_deflate_state {
+ int seqno;
+ int w_size;
+ int unit;
+ int mru;
+ int debug;
+ z_stream strm;
+ struct compstat stats;
+};
+
+#define DEFLATE_OVHD 2 /* Deflate overhead/packet */
+
+static void *zalloc __P((void *, unsigned int items, unsigned int size));
+static void zfree __P((void *, void *ptr, unsigned int nb));
+static void *z_comp_alloc __P((unsigned char *options, int opt_len));
+static void *z_decomp_alloc __P((unsigned char *options, int opt_len));
+static void z_comp_free __P((void *state));
+static void z_decomp_free __P((void *state));
+static int z_comp_init __P((void *state, unsigned char *options,
+ int opt_len,
+ int unit, int hdrlen, int debug));
+static int z_decomp_init __P((void *state, unsigned char *options,
+ int opt_len,
+ int unit, int hdrlen, int mru, int debug));
+static int z_compress __P((void *state, unsigned char *rptr,
+ unsigned char *obuf,
+ int isize, int osize));
+static void z_incomp __P((void *state, unsigned char *ibuf, int icnt));
+static int z_decompress __P((void *state, unsigned char *ibuf,
+ int isize, unsigned char *obuf, int osize));
+static void z_comp_reset __P((void *state));
+static void z_decomp_reset __P((void *state));
+static void z_comp_stats __P((void *state, struct compstat *stats));
+
+/*
+ * This is a small set of memory allocation routines. I created them so
+ * that all memory allocation from the kernel takes place at the
+ * z_(de)comp_alloc and z_(de)comp_free routines. This eliminates worry
+ * about calling valloc() from within an interrupt.
+ *
+ * The free list is a single linked list sorted by memory address.
+ * The zfree() function re-combines any segments it can.
+ */
+typedef struct memchunk {
+ unsigned int m_size;
+ struct memchunk *m_next;
+} MemChunk;
+
+typedef struct {
+ void *memHead;
+ MemChunk *freePool;
+} MemPool;
+
+static int memPoolAlloc __P((void *arg, unsigned int size));
+static void memPoolFree __P((void *arg));
+
+static int
+memPoolAlloc(arg, size)
+void *arg;
+unsigned int size;
+{
+ MemPool **memPool = arg;
+ MemChunk *freePool;
+
+ if ((*memPool = kmalloc(sizeof(MemPool), GFP_KERNEL)) == NULL) {
+ printk(KERN_DEBUG "Unable to allocate Memory Head\n");
+ return 0;
+ }
+
+ if (((*memPool)->memHead = (void *)vmalloc(size)) == NULL) {
+ printk(KERN_DEBUG "Unable to allocate Memory Pool\n");
+ kfree(*memPool);
+ return 0;
+ }
+ freePool = (*memPool)->freePool = (*memPool)->memHead;
+ freePool->m_size = size;
+ freePool->m_next = 0;
+
+ return 1;
+}
+
+static void
+memPoolFree(arg)
+void *arg;
+{
+ MemPool **memPool = arg;
+
+ if (*memPool) {
+ vfree((*memPool)->memHead);
+ kfree(*memPool);
+ *memPool = NULL;
+ }
+}
+
+#ifdef POOLDGB
+static void showFreeList __P((MemChunk *));
+
+static void
+showFreeList(freePool)
+MemChunk *freePool;
+{
+ MemChunk *node;
+
+ for (node = freePool; node; node = node->m_next)
+ printk(KERN_DEBUG "{%x,%d}->", node, node->m_size);
+ printk(KERN_DEBUG "\n");
+}
+#endif
+
+/*
+ * Space allocation and freeing routines for use by zlib routines.
+ */
+void
+zfree(arg, ptr, nbytes)
+ void *arg;
+ void *ptr;
+ unsigned int nbytes;
+{
+ MemPool *memPool = (MemPool *)arg;
+ MemChunk *mprev = 0, *node;
+ MemChunk *new = (void *)(((unsigned char *)ptr) - sizeof(MemChunk));
+
+ if (!memPool->freePool) {
+ new->m_next = 0;
+ memPool->freePool = new;
+ } else {
+ /*
+ * Find where this new chunk fits in the free list.
+ */
+ for (node = memPool->freePool; node && new > node; node = node->m_next)
+ mprev = node;
+ /*
+ * Re-combine with the following free chunk if possible.
+ */
+ if ((((unsigned char *)new) + new->m_size) == (unsigned char *)node) {
+ new->m_size += node->m_size;
+ new->m_next = node->m_next;
+ if (mprev) {
+ if ((((unsigned char *)mprev) + mprev->m_size) == (unsigned char *)new) {
+ mprev->m_size += new->m_size;
+ mprev->m_next = new->m_next;
+ } else
+ mprev->m_next = new;
+ } else
+ memPool->freePool = new;
+ /*
+ * Re-combine with the previous free chunk if possible.
+ */
+ } else if (mprev && (((unsigned char *)mprev) + mprev->m_size) ==
+ (unsigned char *)new) {
+ mprev->m_size += new->m_size;
+ if ((((unsigned char *)mprev) + mprev->m_size) == (unsigned char *)node) {
+ mprev->m_size += node->m_size;
+ mprev->m_next = node->m_next;
+ } else
+ mprev->m_next = node;
+ /*
+ * No luck re-combining, just insert the new chunk into the list.
+ */
+ } else {
+ if (mprev)
+ mprev->m_next = new;
+ else
+ memPool->freePool = new;
+ new->m_next = node;
+ }
+ }
+}
+
+void *
+zalloc(arg, items, size)
+ void *arg;
+ unsigned int items, size;
+{
+ MemPool *memPool = (MemPool *)arg;
+ MemChunk *mprev = 0, *node;
+
+ size *= items;
+ size += sizeof(MemChunk);
+ if (size & 0x3)
+ size = (size + 7) & ~3;
+ for (node = memPool->freePool; node; node = node->m_next) {
+ if (size == node->m_size) {
+ if (mprev)
+ mprev->m_next = node->m_next;
+ else
+ memPool->freePool = node->m_next;
+ return (void *)(((unsigned char *)node)+sizeof(MemChunk));
+ } else if (node->m_size > (size + sizeof(MemChunk) + 7)) {
+ MemChunk *new;
+
+ new = (void *)(((unsigned char *)node) + size);
+ new->m_size = node->m_size - size;
+ new->m_next = node->m_next;
+ if (mprev)
+ mprev->m_next = new;
+ else
+ memPool->freePool = new;
+
+ node->m_size = size;
+
+ return (void *)(((unsigned char *)node)+sizeof(MemChunk));
+ break;
+ }
+ mprev = node;
+ }
+ printk(KERN_DEBUG
+ "zalloc(%d)... Out of memory in Pool!\n", size - sizeof(MemChunk));
+ return NULL;
+}
+
+static void
+z_comp_free(arg)
+ void *arg;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+
+ if (state) {
+ deflateEnd(&state->strm);
+ memPoolFree(&state->strm.opaque);
+ kfree(state);
+ MOD_DEC_USE_COUNT;
+ }
+}
+
+/*
+ * Allocate space for a compressor.
+ */
+static void *
+z_comp_alloc(options, opt_len)
+ unsigned char *options;
+ int opt_len;
+{
+ struct ppp_deflate_state *state;
+ int w_size;
+
+ if (opt_len != CILEN_DEFLATE || options[0] != CI_DEFLATE
+ || options[1] != CILEN_DEFLATE
+ || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return NULL;
+ w_size = DEFLATE_SIZE(options[2]);
+ if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
+ return NULL;
+
+ state = (struct ppp_deflate_state *) kmalloc(sizeof(*state), GFP_KERNEL);
+ if (state == NULL)
+ return NULL;
+
+ MOD_INC_USE_COUNT;
+ memset (state, 0, sizeof (struct ppp_deflate_state));
+ state->strm.next_in = NULL;
+ state->strm.zalloc = zalloc;
+ state->strm.zfree = zfree;
+ state->w_size = w_size;
+
+ if (!memPoolAlloc(&state->strm.opaque, 0x50000)) {
+ z_comp_free(state);
+ return NULL;
+ }
+
+ if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL,
+ -w_size, 8, Z_DEFAULT_STRATEGY, DEFLATE_OVHD+2) != Z_OK) {
+ z_comp_free(state);
+ return NULL;
+ }
+ return (void *) state;
+}
+
+static int
+z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
+ void *arg;
+ unsigned char *options;
+ int opt_len, unit, hdrlen, debug;
+{
+ struct ppp_deflate_state *state = (struct ppp_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
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return 0;
+
+ state->seqno = 0;
+ state->unit = unit;
+ state->debug = debug;
+
+ deflateReset(&state->strm);
+
+ return 1;
+}
+
+static void
+z_comp_reset(arg)
+ void *arg;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+ state->seqno = 0;
+ deflateReset(&state->strm);
+}
+
+int
+z_compress(arg, rptr, obuf, isize, osize)
+ void *arg;
+ unsigned char *rptr; /* uncompressed packet (in) */
+ unsigned char *obuf; /* compressed packet (out) */
+ int isize, osize;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+ int r, proto, off, olen;
+ unsigned char *wptr;
+
+ /*
+ * Check that the protocol is in the range we handle.
+ */
+ proto = PPP_PROTOCOL(rptr);
+ if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
+ return isize;
+
+ /* Don't generate compressed packets which are larger than
+ the uncompressed packet. */
+ if (osize > isize)
+ osize = isize;
+
+ wptr = obuf;
+
+ /*
+ * Copy over the PPP header and store the 2-byte sequence number.
+ */
+ wptr[0] = PPP_ADDRESS(rptr);
+ wptr[1] = PPP_CONTROL(rptr);
+ wptr[2] = PPP_COMP >> 8;
+ wptr[3] = PPP_COMP;
+ wptr += PPP_HDRLEN;
+ wptr[0] = state->seqno >> 8;
+ wptr[1] = state->seqno;
+ wptr += 2;
+ state->strm.next_out = wptr;
+ state->strm.avail_out = osize - (PPP_HDRLEN + 2);
+ ++state->seqno;
+
+ off = (proto > 0xff) ? 2 : 3; /* skip 1st proto byte if 0 */
+ rptr += off;
+ state->strm.next_in = rptr;
+ state->strm.avail_in = (isize - off);
+
+ olen = 0;
+ for (;;) {
+ r = deflate(&state->strm, Z_PACKET_FLUSH);
+ if (r != Z_OK) {
+ printk(KERN_DEBUG "z_compress: deflate returned %d (%s)\n",
+ r, (state->strm.msg? state->strm.msg: ""));
+ break;
+ }
+ if (state->strm.avail_out == 0) {
+ olen += osize;
+ state->strm.next_out = NULL;
+ state->strm.avail_out = 1000000;
+ } else {
+ break; /* all done */
+ }
+ }
+ if (olen < osize)
+ olen += osize - state->strm.avail_out;
+
+ /*
+ * See if we managed to reduce the size of the packet.
+ * If the compressor just gave us a single zero byte, it means
+ * the packet was incompressible.
+ */
+ if (olen < isize && !(olen == PPP_HDRLEN + 3 && *wptr == 0)) {
+ state->stats.comp_bytes += olen;
+ state->stats.comp_packets++;
+ } else {
+ state->stats.inc_bytes += isize;
+ state->stats.inc_packets++;
+ olen = 0;
+ }
+ state->stats.unc_bytes += isize;
+ state->stats.unc_packets++;
+
+ return olen;
+}
+
+static void
+z_comp_stats(arg, stats)
+ void *arg;
+ struct compstat *stats;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+
+ *stats = state->stats;
+}
+
+static void
+z_decomp_free(arg)
+ void *arg;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+
+ if (state) {
+ inflateEnd(&state->strm);
+ memPoolFree(&state->strm.opaque);
+ kfree(state);
+ MOD_DEC_USE_COUNT;
+ }
+}
+
+/*
+ * Allocate space for a decompressor.
+ */
+static void *
+z_decomp_alloc(options, opt_len)
+ unsigned char *options;
+ int opt_len;
+{
+ struct ppp_deflate_state *state;
+ int w_size;
+
+ if (opt_len != CILEN_DEFLATE || options[0] != CI_DEFLATE
+ || options[1] != CILEN_DEFLATE
+ || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return NULL;
+ w_size = DEFLATE_SIZE(options[2]);
+ if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
+ return NULL;
+
+ state = (struct ppp_deflate_state *) kmalloc(sizeof(*state), GFP_KERNEL);
+ if (state == NULL)
+ return NULL;
+
+ MOD_INC_USE_COUNT;
+ memset (state, 0, sizeof (struct ppp_deflate_state));
+ state->w_size = w_size;
+ state->strm.next_out = NULL;
+ state->strm.zalloc = zalloc;
+ state->strm.zfree = zfree;
+
+ if (!memPoolAlloc(&state->strm.opaque, 0x10000)) {
+ z_decomp_free(state);
+ return NULL;
+ }
+
+ if (inflateInit2(&state->strm, -w_size) != Z_OK) {
+ z_decomp_free(state);
+ return NULL;
+ }
+ return (void *) state;
+}
+
+static int
+z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
+ void *arg;
+ unsigned char *options;
+ int opt_len, unit, hdrlen, mru, debug;
+{
+ struct ppp_deflate_state *state = (struct ppp_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
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return 0;
+
+ state->seqno = 0;
+ state->unit = unit;
+ state->debug = debug;
+ state->mru = mru;
+
+ inflateReset(&state->strm);
+
+ return 1;
+}
+
+static void
+z_decomp_reset(arg)
+ void *arg;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+
+ state->seqno = 0;
+ inflateReset(&state->strm);
+}
+
+/*
+ * Decompress a Deflate-compressed packet.
+ *
+ * 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, ibuf, isize, obuf, osize)
+ void *arg;
+ unsigned char *ibuf;
+ int isize;
+ unsigned char *obuf;
+ int osize;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+ int olen, seq, i, r, decode_proto;
+ unsigned char hdr[PPP_HDRLEN + DEFLATE_OVHD];
+ unsigned char *rptr, *wptr;
+
+ rptr = ibuf;
+ wptr = obuf;
+ for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i)
+ hdr[i] = *rptr++;
+
+ /* Check the sequence number. */
+ seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1];
+ if (seq != state->seqno) {
+ if (state->debug)
+ printk(KERN_DEBUG "z_decompress%d: bad seq # %d, expected %d\n",
+ state->unit, seq, state->seqno);
+ return DECOMP_ERROR;
+ }
+ ++state->seqno;
+
+ /*
+ * Fill in the first part of the PPP header. The protocol field
+ * comes from the decompressed data.
+ */
+ 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 = isize - (PPP_HDRLEN + DEFLATE_OVHD);
+ state->strm.next_out = wptr + 3;
+ state->strm.avail_out = 1;
+ decode_proto = 1;
+
+ /*
+ * Call inflate, supplying more input or output as needed.
+ */
+ for (;;) {
+ r = 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 (state->strm.avail_out == 0) {
+ if (decode_proto) {
+ state->strm.avail_out = osize - PPP_HDRLEN;
+ if ((wptr[3] & 1) == 0) {
+ /* 2-byte protocol field */
+ wptr[2] = wptr[3];
+ --state->strm.next_out;
+ ++state->strm.avail_out;
+ }
+ decode_proto = 0;
+ } else {
+ if (state->debug)
+ printk(KERN_DEBUG "z_decompress%d: ran out of mru\n",
+ state->unit);
+ return DECOMP_FATALERROR;
+ }
+ }
+ }
+
+ if (decode_proto)
+ return DECOMP_ERROR;
+
+ olen = (osize - state->strm.avail_out);
+
+ state->stats.unc_bytes += olen;
+ state->stats.unc_packets++;
+ state->stats.comp_bytes += isize;
+ state->stats.comp_packets++;
+
+ return olen;
+}
+
+/*
+ * Incompressible data has arrived - add it to the history.
+ */
+static void
+z_incomp(arg, ibuf, icnt)
+ void *arg;
+ unsigned char *ibuf;
+ int icnt;
+{
+ struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
+ unsigned char *rptr = ibuf;
+ int proto, r;
+
+ /*
+ * Check that the protocol is one we handle.
+ */
+ proto = PPP_PROTOCOL(rptr);
+ if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
+ return;
+
+ ++state->seqno;
+
+ /*
+ * Iterate through the message blocks, adding the characters in them
+ * to the decompressor's history. For the first block, 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 = rptr + 3;
+ state->strm.avail_in = icnt - 3;
+ if (proto > 0xff) {
+ --state->strm.next_in;
+ ++state->strm.avail_in;
+ }
+
+ r = 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.c */
+extern int ppp_register_compressor (struct compressor *cp);
+extern void ppp_unregister_compressor (struct compressor *cp);
+
+/*
+ * Procedures exported to if_ppp.c.
+ */
+struct compressor ppp_deflate = {
+ CI_DEFLATE, /* compress_proto */
+ z_comp_alloc, /* comp_alloc */
+ z_comp_free, /* comp_free */
+ z_comp_init, /* comp_init */
+ z_comp_reset, /* comp_reset */
+ z_compress, /* compress */
+ z_comp_stats, /* comp_stat */
+ z_decomp_alloc, /* decomp_alloc */
+ z_decomp_free, /* decomp_free */
+ z_decomp_init, /* decomp_init */
+ z_decomp_reset, /* decomp_reset */
+ z_decompress, /* decompress */
+ z_incomp, /* incomp */
+ z_comp_stats, /* decomp_stat */
+};
+
+/*************************************************************
+ * Module support routines
+ *************************************************************/
+
+int
+init_module(void)
+{
+ int answer = ppp_register_compressor (&ppp_deflate);
+ if (answer == 0)
+ printk (KERN_INFO
+ "PPP Deflate Compression module registered\n");
+ return answer;
+}
+
+void
+cleanup_module(void)
+{
+ if (MOD_IN_USE)
+ printk (KERN_INFO
+ "Deflate Compression module busy, remove delayed\n");
+ else
+ ppp_unregister_compressor (&ppp_deflate);
+}
projects / ppp.git / blobdiff