Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * ppp_deflate.c - interface the zlib procedures for Deflate compression |
3 | * and decompression (as used by gzip) to the PPP code. | |
1da177e4 | 4 | * |
784db3f0 | 5 | * Copyright 1994-1998 Paul Mackerras. |
1da177e4 | 6 | * |
784db3f0 PM |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
1da177e4 LT |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/string.h> | |
17 | ||
18 | #include <linux/ppp_defs.h> | |
19 | #include <linux/ppp-comp.h> | |
20 | ||
21 | #include <linux/zlib.h> | |
96545aeb | 22 | #include <asm/unaligned.h> |
1da177e4 LT |
23 | |
24 | /* | |
25 | * State for a Deflate (de)compressor. | |
26 | */ | |
27 | struct ppp_deflate_state { | |
28 | int seqno; | |
29 | int w_size; | |
30 | int unit; | |
31 | int mru; | |
32 | int debug; | |
33 | z_stream strm; | |
34 | struct compstat stats; | |
35 | }; | |
36 | ||
37 | #define DEFLATE_OVHD 2 /* Deflate overhead/packet */ | |
38 | ||
39 | static void *z_comp_alloc(unsigned char *options, int opt_len); | |
40 | static void *z_decomp_alloc(unsigned char *options, int opt_len); | |
41 | static void z_comp_free(void *state); | |
42 | static void z_decomp_free(void *state); | |
43 | static int z_comp_init(void *state, unsigned char *options, | |
44 | int opt_len, | |
45 | int unit, int hdrlen, int debug); | |
46 | static int z_decomp_init(void *state, unsigned char *options, | |
47 | int opt_len, | |
48 | int unit, int hdrlen, int mru, int debug); | |
49 | static int z_compress(void *state, unsigned char *rptr, | |
50 | unsigned char *obuf, | |
51 | int isize, int osize); | |
52 | static void z_incomp(void *state, unsigned char *ibuf, int icnt); | |
53 | static int z_decompress(void *state, unsigned char *ibuf, | |
54 | int isize, unsigned char *obuf, int osize); | |
55 | static void z_comp_reset(void *state); | |
56 | static void z_decomp_reset(void *state); | |
57 | static void z_comp_stats(void *state, struct compstat *stats); | |
58 | ||
59 | /** | |
60 | * z_comp_free - free the memory used by a compressor | |
61 | * @arg: pointer to the private state for the compressor. | |
62 | */ | |
63 | static void z_comp_free(void *arg) | |
64 | { | |
65 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
66 | ||
67 | if (state) { | |
68 | zlib_deflateEnd(&state->strm); | |
96edf83c | 69 | vfree(state->strm.workspace); |
1da177e4 LT |
70 | kfree(state); |
71 | } | |
72 | } | |
73 | ||
74 | /** | |
75 | * z_comp_alloc - allocate space for a compressor. | |
76 | * @options: pointer to CCP option data | |
77 | * @opt_len: length of the CCP option at @options. | |
78 | * | |
79 | * The @options pointer points to the a buffer containing the | |
80 | * CCP option data for the compression being negotiated. It is | |
81 | * formatted according to RFC1979, and describes the window | |
82 | * size that the peer is requesting that we use in compressing | |
83 | * data to be sent to it. | |
84 | * | |
85 | * Returns the pointer to the private state for the compressor, | |
86 | * or NULL if we could not allocate enough memory. | |
87 | */ | |
88 | static void *z_comp_alloc(unsigned char *options, int opt_len) | |
89 | { | |
90 | struct ppp_deflate_state *state; | |
91 | int w_size; | |
92 | ||
8e95a202 JP |
93 | if (opt_len != CILEN_DEFLATE || |
94 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
95 | options[1] != CILEN_DEFLATE || | |
96 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
97 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
98 | return NULL; |
99 | w_size = DEFLATE_SIZE(options[2]); | |
100 | if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE) | |
101 | return NULL; | |
102 | ||
dd00cc48 | 103 | state = kzalloc(sizeof(*state), |
1da177e4 LT |
104 | GFP_KERNEL); |
105 | if (state == NULL) | |
106 | return NULL; | |
107 | ||
1da177e4 LT |
108 | state->strm.next_in = NULL; |
109 | state->w_size = w_size; | |
565d76cb | 110 | state->strm.workspace = vmalloc(zlib_deflate_workspacesize(-w_size, 8)); |
1da177e4 LT |
111 | if (state->strm.workspace == NULL) |
112 | goto out_free; | |
113 | ||
114 | if (zlib_deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, | |
115 | DEFLATE_METHOD_VAL, -w_size, 8, Z_DEFAULT_STRATEGY) | |
116 | != Z_OK) | |
117 | goto out_free; | |
118 | return (void *) state; | |
119 | ||
120 | out_free: | |
121 | z_comp_free(state); | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | /** | |
126 | * z_comp_init - initialize a previously-allocated compressor. | |
127 | * @arg: pointer to the private state for the compressor | |
128 | * @options: pointer to the CCP option data describing the | |
129 | * compression that was negotiated with the peer | |
130 | * @opt_len: length of the CCP option data at @options | |
131 | * @unit: PPP unit number for diagnostic messages | |
132 | * @hdrlen: ignored (present for backwards compatibility) | |
133 | * @debug: debug flag; if non-zero, debug messages are printed. | |
134 | * | |
135 | * The CCP options described by @options must match the options | |
136 | * specified when the compressor was allocated. The compressor | |
137 | * history is reset. Returns 0 for failure (CCP options don't | |
138 | * match) or 1 for success. | |
139 | */ | |
140 | static int z_comp_init(void *arg, unsigned char *options, int opt_len, | |
141 | int unit, int hdrlen, int debug) | |
142 | { | |
143 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
144 | ||
8e95a202 JP |
145 | if (opt_len < CILEN_DEFLATE || |
146 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
147 | options[1] != CILEN_DEFLATE || | |
148 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
149 | DEFLATE_SIZE(options[2]) != state->w_size || | |
150 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
151 | return 0; |
152 | ||
153 | state->seqno = 0; | |
154 | state->unit = unit; | |
155 | state->debug = debug; | |
156 | ||
157 | zlib_deflateReset(&state->strm); | |
158 | ||
159 | return 1; | |
160 | } | |
161 | ||
162 | /** | |
163 | * z_comp_reset - reset a previously-allocated compressor. | |
164 | * @arg: pointer to private state for the compressor. | |
165 | * | |
166 | * This clears the history for the compressor and makes it | |
167 | * ready to start emitting a new compressed stream. | |
168 | */ | |
169 | static void z_comp_reset(void *arg) | |
170 | { | |
171 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
172 | ||
173 | state->seqno = 0; | |
174 | zlib_deflateReset(&state->strm); | |
175 | } | |
176 | ||
177 | /** | |
178 | * z_compress - compress a PPP packet with Deflate compression. | |
179 | * @arg: pointer to private state for the compressor | |
180 | * @rptr: uncompressed packet (input) | |
181 | * @obuf: compressed packet (output) | |
182 | * @isize: size of uncompressed packet | |
183 | * @osize: space available at @obuf | |
184 | * | |
185 | * Returns the length of the compressed packet, or 0 if the | |
186 | * packet is incompressible. | |
187 | */ | |
3c582b30 | 188 | static int z_compress(void *arg, unsigned char *rptr, unsigned char *obuf, |
1da177e4 LT |
189 | int isize, int osize) |
190 | { | |
191 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
192 | int r, proto, off, olen, oavail; | |
193 | unsigned char *wptr; | |
194 | ||
195 | /* | |
196 | * Check that the protocol is in the range we handle. | |
197 | */ | |
198 | proto = PPP_PROTOCOL(rptr); | |
199 | if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) | |
200 | return 0; | |
201 | ||
202 | /* Don't generate compressed packets which are larger than | |
203 | the uncompressed packet. */ | |
204 | if (osize > isize) | |
205 | osize = isize; | |
206 | ||
207 | wptr = obuf; | |
208 | ||
209 | /* | |
210 | * Copy over the PPP header and store the 2-byte sequence number. | |
211 | */ | |
212 | wptr[0] = PPP_ADDRESS(rptr); | |
213 | wptr[1] = PPP_CONTROL(rptr); | |
96545aeb | 214 | put_unaligned_be16(PPP_COMP, wptr + 2); |
1da177e4 | 215 | wptr += PPP_HDRLEN; |
96545aeb | 216 | put_unaligned_be16(state->seqno, wptr); |
1da177e4 LT |
217 | wptr += DEFLATE_OVHD; |
218 | olen = PPP_HDRLEN + DEFLATE_OVHD; | |
219 | state->strm.next_out = wptr; | |
220 | state->strm.avail_out = oavail = osize - olen; | |
221 | ++state->seqno; | |
222 | ||
223 | off = (proto > 0xff) ? 2 : 3; /* skip 1st proto byte if 0 */ | |
224 | rptr += off; | |
225 | state->strm.next_in = rptr; | |
226 | state->strm.avail_in = (isize - off); | |
227 | ||
228 | for (;;) { | |
229 | r = zlib_deflate(&state->strm, Z_PACKET_FLUSH); | |
230 | if (r != Z_OK) { | |
231 | if (state->debug) | |
232 | printk(KERN_ERR | |
233 | "z_compress: deflate returned %d\n", r); | |
234 | break; | |
235 | } | |
236 | if (state->strm.avail_out == 0) { | |
237 | olen += oavail; | |
238 | state->strm.next_out = NULL; | |
239 | state->strm.avail_out = oavail = 1000000; | |
240 | } else { | |
241 | break; /* all done */ | |
242 | } | |
243 | } | |
244 | olen += oavail - state->strm.avail_out; | |
245 | ||
246 | /* | |
247 | * See if we managed to reduce the size of the packet. | |
248 | */ | |
e2a4800e | 249 | if (olen < isize && olen <= osize) { |
1da177e4 LT |
250 | state->stats.comp_bytes += olen; |
251 | state->stats.comp_packets++; | |
252 | } else { | |
253 | state->stats.inc_bytes += isize; | |
254 | state->stats.inc_packets++; | |
255 | olen = 0; | |
256 | } | |
257 | state->stats.unc_bytes += isize; | |
258 | state->stats.unc_packets++; | |
259 | ||
260 | return olen; | |
261 | } | |
262 | ||
263 | /** | |
264 | * z_comp_stats - return compression statistics for a compressor | |
265 | * or decompressor. | |
266 | * @arg: pointer to private space for the (de)compressor | |
267 | * @stats: pointer to a struct compstat to receive the result. | |
268 | */ | |
269 | static void z_comp_stats(void *arg, struct compstat *stats) | |
270 | { | |
271 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
272 | ||
273 | *stats = state->stats; | |
274 | } | |
275 | ||
276 | /** | |
277 | * z_decomp_free - Free the memory used by a decompressor. | |
278 | * @arg: pointer to private space for the decompressor. | |
279 | */ | |
280 | static void z_decomp_free(void *arg) | |
281 | { | |
282 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
283 | ||
284 | if (state) { | |
285 | zlib_inflateEnd(&state->strm); | |
7ab24bfd | 286 | vfree(state->strm.workspace); |
1da177e4 LT |
287 | kfree(state); |
288 | } | |
289 | } | |
290 | ||
291 | /** | |
292 | * z_decomp_alloc - allocate space for a decompressor. | |
293 | * @options: pointer to CCP option data | |
294 | * @opt_len: length of the CCP option at @options. | |
295 | * | |
296 | * The @options pointer points to the a buffer containing the | |
297 | * CCP option data for the compression being negotiated. It is | |
298 | * formatted according to RFC1979, and describes the window | |
299 | * size that we are requesting the peer to use in compressing | |
300 | * data to be sent to us. | |
301 | * | |
302 | * Returns the pointer to the private state for the decompressor, | |
303 | * or NULL if we could not allocate enough memory. | |
304 | */ | |
305 | static void *z_decomp_alloc(unsigned char *options, int opt_len) | |
306 | { | |
307 | struct ppp_deflate_state *state; | |
308 | int w_size; | |
309 | ||
8e95a202 JP |
310 | if (opt_len != CILEN_DEFLATE || |
311 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
312 | options[1] != CILEN_DEFLATE || | |
313 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
314 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
315 | return NULL; |
316 | w_size = DEFLATE_SIZE(options[2]); | |
317 | if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE) | |
318 | return NULL; | |
319 | ||
dd00cc48 | 320 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
321 | if (state == NULL) |
322 | return NULL; | |
323 | ||
1da177e4 LT |
324 | state->w_size = w_size; |
325 | state->strm.next_out = NULL; | |
7ab24bfd | 326 | state->strm.workspace = vmalloc(zlib_inflate_workspacesize()); |
1da177e4 LT |
327 | if (state->strm.workspace == NULL) |
328 | goto out_free; | |
329 | ||
330 | if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK) | |
331 | goto out_free; | |
332 | return (void *) state; | |
333 | ||
334 | out_free: | |
335 | z_decomp_free(state); | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | /** | |
340 | * z_decomp_init - initialize a previously-allocated decompressor. | |
341 | * @arg: pointer to the private state for the decompressor | |
342 | * @options: pointer to the CCP option data describing the | |
343 | * compression that was negotiated with the peer | |
344 | * @opt_len: length of the CCP option data at @options | |
345 | * @unit: PPP unit number for diagnostic messages | |
346 | * @hdrlen: ignored (present for backwards compatibility) | |
347 | * @mru: maximum length of decompressed packets | |
348 | * @debug: debug flag; if non-zero, debug messages are printed. | |
349 | * | |
350 | * The CCP options described by @options must match the options | |
351 | * specified when the decompressor was allocated. The decompressor | |
352 | * history is reset. Returns 0 for failure (CCP options don't | |
353 | * match) or 1 for success. | |
354 | */ | |
355 | static int z_decomp_init(void *arg, unsigned char *options, int opt_len, | |
356 | int unit, int hdrlen, int mru, int debug) | |
357 | { | |
358 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
359 | ||
8e95a202 JP |
360 | if (opt_len < CILEN_DEFLATE || |
361 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
362 | options[1] != CILEN_DEFLATE || | |
363 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
364 | DEFLATE_SIZE(options[2]) != state->w_size || | |
365 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
366 | return 0; |
367 | ||
368 | state->seqno = 0; | |
369 | state->unit = unit; | |
370 | state->debug = debug; | |
371 | state->mru = mru; | |
372 | ||
373 | zlib_inflateReset(&state->strm); | |
374 | ||
375 | return 1; | |
376 | } | |
377 | ||
378 | /** | |
379 | * z_decomp_reset - reset a previously-allocated decompressor. | |
380 | * @arg: pointer to private state for the decompressor. | |
381 | * | |
382 | * This clears the history for the decompressor and makes it | |
383 | * ready to receive a new compressed stream. | |
384 | */ | |
385 | static void z_decomp_reset(void *arg) | |
386 | { | |
387 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
388 | ||
389 | state->seqno = 0; | |
390 | zlib_inflateReset(&state->strm); | |
391 | } | |
392 | ||
393 | /** | |
394 | * z_decompress - decompress a Deflate-compressed packet. | |
395 | * @arg: pointer to private state for the decompressor | |
396 | * @ibuf: pointer to input (compressed) packet data | |
397 | * @isize: length of input packet | |
398 | * @obuf: pointer to space for output (decompressed) packet | |
399 | * @osize: amount of space available at @obuf | |
400 | * | |
401 | * Because of patent problems, we return DECOMP_ERROR for errors | |
402 | * found by inspecting the input data and for system problems, but | |
403 | * DECOMP_FATALERROR for any errors which could possibly be said to | |
404 | * be being detected "after" decompression. For DECOMP_ERROR, | |
405 | * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be | |
406 | * infringing a patent of Motorola's if we do, so we take CCP down | |
407 | * instead. | |
408 | * | |
409 | * Given that the frame has the correct sequence number and a good FCS, | |
410 | * errors such as invalid codes in the input most likely indicate a | |
411 | * bug, so we return DECOMP_FATALERROR for them in order to turn off | |
412 | * compression, even though they are detected by inspecting the input. | |
413 | */ | |
3c582b30 | 414 | static int z_decompress(void *arg, unsigned char *ibuf, int isize, |
1da177e4 LT |
415 | unsigned char *obuf, int osize) |
416 | { | |
417 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
418 | int olen, seq, r; | |
419 | int decode_proto, overflow; | |
420 | unsigned char overflow_buf[1]; | |
421 | ||
422 | if (isize <= PPP_HDRLEN + DEFLATE_OVHD) { | |
423 | if (state->debug) | |
424 | printk(KERN_DEBUG "z_decompress%d: short pkt (%d)\n", | |
425 | state->unit, isize); | |
426 | return DECOMP_ERROR; | |
427 | } | |
428 | ||
429 | /* Check the sequence number. */ | |
96545aeb | 430 | seq = get_unaligned_be16(ibuf + PPP_HDRLEN); |
1da177e4 LT |
431 | if (seq != (state->seqno & 0xffff)) { |
432 | if (state->debug) | |
433 | printk(KERN_DEBUG "z_decompress%d: bad seq # %d, expected %d\n", | |
434 | state->unit, seq, state->seqno & 0xffff); | |
435 | return DECOMP_ERROR; | |
436 | } | |
437 | ++state->seqno; | |
438 | ||
439 | /* | |
440 | * Fill in the first part of the PPP header. The protocol field | |
441 | * comes from the decompressed data. | |
442 | */ | |
443 | obuf[0] = PPP_ADDRESS(ibuf); | |
444 | obuf[1] = PPP_CONTROL(ibuf); | |
445 | obuf[2] = 0; | |
446 | ||
447 | /* | |
448 | * Set up to call inflate. We set avail_out to 1 initially so we can | |
449 | * look at the first byte of the output and decide whether we have | |
450 | * a 1-byte or 2-byte protocol field. | |
451 | */ | |
452 | state->strm.next_in = ibuf + PPP_HDRLEN + DEFLATE_OVHD; | |
453 | state->strm.avail_in = isize - (PPP_HDRLEN + DEFLATE_OVHD); | |
454 | state->strm.next_out = obuf + 3; | |
455 | state->strm.avail_out = 1; | |
456 | decode_proto = 1; | |
457 | overflow = 0; | |
458 | ||
459 | /* | |
460 | * Call inflate, supplying more input or output as needed. | |
461 | */ | |
462 | for (;;) { | |
463 | r = zlib_inflate(&state->strm, Z_PACKET_FLUSH); | |
464 | if (r != Z_OK) { | |
465 | if (state->debug) | |
466 | printk(KERN_DEBUG "z_decompress%d: inflate returned %d (%s)\n", | |
467 | state->unit, r, (state->strm.msg? state->strm.msg: "")); | |
468 | return DECOMP_FATALERROR; | |
469 | } | |
470 | if (state->strm.avail_out != 0) | |
471 | break; /* all done */ | |
472 | if (decode_proto) { | |
473 | state->strm.avail_out = osize - PPP_HDRLEN; | |
474 | if ((obuf[3] & 1) == 0) { | |
475 | /* 2-byte protocol field */ | |
476 | obuf[2] = obuf[3]; | |
477 | --state->strm.next_out; | |
478 | ++state->strm.avail_out; | |
479 | } | |
480 | decode_proto = 0; | |
481 | } else if (!overflow) { | |
482 | /* | |
483 | * We've filled up the output buffer; the only way to | |
484 | * find out whether inflate has any more characters | |
485 | * left is to give it another byte of output space. | |
486 | */ | |
487 | state->strm.next_out = overflow_buf; | |
488 | state->strm.avail_out = 1; | |
489 | overflow = 1; | |
490 | } else { | |
491 | if (state->debug) | |
492 | printk(KERN_DEBUG "z_decompress%d: ran out of mru\n", | |
493 | state->unit); | |
494 | return DECOMP_FATALERROR; | |
495 | } | |
496 | } | |
497 | ||
498 | if (decode_proto) { | |
499 | if (state->debug) | |
500 | printk(KERN_DEBUG "z_decompress%d: didn't get proto\n", | |
501 | state->unit); | |
502 | return DECOMP_ERROR; | |
503 | } | |
504 | ||
505 | olen = osize + overflow - state->strm.avail_out; | |
506 | state->stats.unc_bytes += olen; | |
507 | state->stats.unc_packets++; | |
508 | state->stats.comp_bytes += isize; | |
509 | state->stats.comp_packets++; | |
510 | ||
511 | return olen; | |
512 | } | |
513 | ||
514 | /** | |
515 | * z_incomp - add incompressible input data to the history. | |
516 | * @arg: pointer to private state for the decompressor | |
517 | * @ibuf: pointer to input packet data | |
518 | * @icnt: length of input data. | |
519 | */ | |
520 | static void z_incomp(void *arg, unsigned char *ibuf, int icnt) | |
521 | { | |
522 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
523 | int proto, r; | |
524 | ||
525 | /* | |
526 | * Check that the protocol is one we handle. | |
527 | */ | |
528 | proto = PPP_PROTOCOL(ibuf); | |
529 | if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) | |
530 | return; | |
531 | ||
532 | ++state->seqno; | |
533 | ||
534 | /* | |
535 | * We start at the either the 1st or 2nd byte of the protocol field, | |
536 | * depending on whether the protocol value is compressible. | |
537 | */ | |
538 | state->strm.next_in = ibuf + 3; | |
539 | state->strm.avail_in = icnt - 3; | |
540 | if (proto > 0xff) { | |
541 | --state->strm.next_in; | |
542 | ++state->strm.avail_in; | |
543 | } | |
544 | ||
545 | r = zlib_inflateIncomp(&state->strm); | |
546 | if (r != Z_OK) { | |
547 | /* gak! */ | |
548 | if (state->debug) { | |
549 | printk(KERN_DEBUG "z_incomp%d: inflateIncomp returned %d (%s)\n", | |
550 | state->unit, r, (state->strm.msg? state->strm.msg: "")); | |
551 | } | |
552 | return; | |
553 | } | |
554 | ||
555 | /* | |
556 | * Update stats. | |
557 | */ | |
558 | state->stats.inc_bytes += icnt; | |
559 | state->stats.inc_packets++; | |
560 | state->stats.unc_bytes += icnt; | |
561 | state->stats.unc_packets++; | |
562 | } | |
563 | ||
564 | /************************************************************* | |
565 | * Module interface table | |
566 | *************************************************************/ | |
567 | ||
568 | /* These are in ppp_generic.c */ | |
569 | extern int ppp_register_compressor (struct compressor *cp); | |
570 | extern void ppp_unregister_compressor (struct compressor *cp); | |
571 | ||
572 | /* | |
573 | * Procedures exported to if_ppp.c. | |
574 | */ | |
575 | static struct compressor ppp_deflate = { | |
576 | .compress_proto = CI_DEFLATE, | |
577 | .comp_alloc = z_comp_alloc, | |
578 | .comp_free = z_comp_free, | |
579 | .comp_init = z_comp_init, | |
580 | .comp_reset = z_comp_reset, | |
581 | .compress = z_compress, | |
582 | .comp_stat = z_comp_stats, | |
583 | .decomp_alloc = z_decomp_alloc, | |
584 | .decomp_free = z_decomp_free, | |
585 | .decomp_init = z_decomp_init, | |
586 | .decomp_reset = z_decomp_reset, | |
587 | .decompress = z_decompress, | |
588 | .incomp = z_incomp, | |
589 | .decomp_stat = z_comp_stats, | |
590 | .owner = THIS_MODULE | |
591 | }; | |
592 | ||
593 | static struct compressor ppp_deflate_draft = { | |
594 | .compress_proto = CI_DEFLATE_DRAFT, | |
595 | .comp_alloc = z_comp_alloc, | |
596 | .comp_free = z_comp_free, | |
597 | .comp_init = z_comp_init, | |
598 | .comp_reset = z_comp_reset, | |
599 | .compress = z_compress, | |
600 | .comp_stat = z_comp_stats, | |
601 | .decomp_alloc = z_decomp_alloc, | |
602 | .decomp_free = z_decomp_free, | |
603 | .decomp_init = z_decomp_init, | |
604 | .decomp_reset = z_decomp_reset, | |
605 | .decompress = z_decompress, | |
606 | .incomp = z_incomp, | |
607 | .decomp_stat = z_comp_stats, | |
608 | .owner = THIS_MODULE | |
609 | }; | |
610 | ||
611 | static int __init deflate_init(void) | |
6aa20a22 | 612 | { |
1da177e4 LT |
613 | int answer = ppp_register_compressor(&ppp_deflate); |
614 | if (answer == 0) | |
615 | printk(KERN_INFO | |
616 | "PPP Deflate Compression module registered\n"); | |
617 | ppp_register_compressor(&ppp_deflate_draft); | |
618 | return answer; | |
619 | } | |
6aa20a22 | 620 | |
1da177e4 LT |
621 | static void __exit deflate_cleanup(void) |
622 | { | |
623 | ppp_unregister_compressor(&ppp_deflate); | |
624 | ppp_unregister_compressor(&ppp_deflate_draft); | |
625 | } | |
626 | ||
627 | module_init(deflate_init); | |
628 | module_exit(deflate_cleanup); | |
629 | MODULE_LICENSE("Dual BSD/GPL"); | |
630 | MODULE_ALIAS("ppp-compress-" __stringify(CI_DEFLATE)); | |
631 | MODULE_ALIAS("ppp-compress-" __stringify(CI_DEFLATE_DRAFT)); |