Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * ppp_deflate.c - interface the zlib procedures for Deflate compression |
4 | * and decompression (as used by gzip) to the PPP code. | |
1da177e4 | 5 | * |
784db3f0 | 6 | * Copyright 1994-1998 Paul Mackerras. |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/vmalloc.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/string.h> | |
14 | ||
15 | #include <linux/ppp_defs.h> | |
16 | #include <linux/ppp-comp.h> | |
17 | ||
18 | #include <linux/zlib.h> | |
96545aeb | 19 | #include <asm/unaligned.h> |
1da177e4 LT |
20 | |
21 | /* | |
22 | * State for a Deflate (de)compressor. | |
23 | */ | |
24 | struct ppp_deflate_state { | |
25 | int seqno; | |
26 | int w_size; | |
27 | int unit; | |
28 | int mru; | |
29 | int debug; | |
30 | z_stream strm; | |
31 | struct compstat stats; | |
32 | }; | |
33 | ||
34 | #define DEFLATE_OVHD 2 /* Deflate overhead/packet */ | |
35 | ||
36 | static void *z_comp_alloc(unsigned char *options, int opt_len); | |
37 | static void *z_decomp_alloc(unsigned char *options, int opt_len); | |
38 | static void z_comp_free(void *state); | |
39 | static void z_decomp_free(void *state); | |
40 | static int z_comp_init(void *state, unsigned char *options, | |
41 | int opt_len, | |
42 | int unit, int hdrlen, int debug); | |
43 | static int z_decomp_init(void *state, unsigned char *options, | |
44 | int opt_len, | |
45 | int unit, int hdrlen, int mru, int debug); | |
46 | static int z_compress(void *state, unsigned char *rptr, | |
47 | unsigned char *obuf, | |
48 | int isize, int osize); | |
49 | static void z_incomp(void *state, unsigned char *ibuf, int icnt); | |
50 | static int z_decompress(void *state, unsigned char *ibuf, | |
51 | int isize, unsigned char *obuf, int osize); | |
52 | static void z_comp_reset(void *state); | |
53 | static void z_decomp_reset(void *state); | |
54 | static void z_comp_stats(void *state, struct compstat *stats); | |
55 | ||
56 | /** | |
57 | * z_comp_free - free the memory used by a compressor | |
58 | * @arg: pointer to the private state for the compressor. | |
59 | */ | |
60 | static void z_comp_free(void *arg) | |
61 | { | |
62 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
63 | ||
64 | if (state) { | |
65 | zlib_deflateEnd(&state->strm); | |
96edf83c | 66 | vfree(state->strm.workspace); |
1da177e4 LT |
67 | kfree(state); |
68 | } | |
69 | } | |
70 | ||
71 | /** | |
72 | * z_comp_alloc - allocate space for a compressor. | |
73 | * @options: pointer to CCP option data | |
74 | * @opt_len: length of the CCP option at @options. | |
75 | * | |
76 | * The @options pointer points to the a buffer containing the | |
77 | * CCP option data for the compression being negotiated. It is | |
78 | * formatted according to RFC1979, and describes the window | |
79 | * size that the peer is requesting that we use in compressing | |
80 | * data to be sent to it. | |
81 | * | |
82 | * Returns the pointer to the private state for the compressor, | |
83 | * or NULL if we could not allocate enough memory. | |
84 | */ | |
85 | static void *z_comp_alloc(unsigned char *options, int opt_len) | |
86 | { | |
87 | struct ppp_deflate_state *state; | |
88 | int w_size; | |
89 | ||
8e95a202 JP |
90 | if (opt_len != CILEN_DEFLATE || |
91 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
92 | options[1] != CILEN_DEFLATE || | |
93 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
94 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
95 | return NULL; |
96 | w_size = DEFLATE_SIZE(options[2]); | |
97 | if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE) | |
98 | return NULL; | |
99 | ||
dd00cc48 | 100 | state = kzalloc(sizeof(*state), |
1da177e4 LT |
101 | GFP_KERNEL); |
102 | if (state == NULL) | |
103 | return NULL; | |
104 | ||
1da177e4 LT |
105 | state->strm.next_in = NULL; |
106 | state->w_size = w_size; | |
565d76cb | 107 | state->strm.workspace = vmalloc(zlib_deflate_workspacesize(-w_size, 8)); |
1da177e4 LT |
108 | if (state->strm.workspace == NULL) |
109 | goto out_free; | |
110 | ||
111 | if (zlib_deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, | |
112 | DEFLATE_METHOD_VAL, -w_size, 8, Z_DEFAULT_STRATEGY) | |
113 | != Z_OK) | |
114 | goto out_free; | |
115 | return (void *) state; | |
116 | ||
117 | out_free: | |
118 | z_comp_free(state); | |
119 | return NULL; | |
120 | } | |
121 | ||
122 | /** | |
123 | * z_comp_init - initialize a previously-allocated compressor. | |
124 | * @arg: pointer to the private state for the compressor | |
125 | * @options: pointer to the CCP option data describing the | |
126 | * compression that was negotiated with the peer | |
127 | * @opt_len: length of the CCP option data at @options | |
128 | * @unit: PPP unit number for diagnostic messages | |
129 | * @hdrlen: ignored (present for backwards compatibility) | |
130 | * @debug: debug flag; if non-zero, debug messages are printed. | |
131 | * | |
132 | * The CCP options described by @options must match the options | |
133 | * specified when the compressor was allocated. The compressor | |
134 | * history is reset. Returns 0 for failure (CCP options don't | |
135 | * match) or 1 for success. | |
136 | */ | |
137 | static int z_comp_init(void *arg, unsigned char *options, int opt_len, | |
138 | int unit, int hdrlen, int debug) | |
139 | { | |
140 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
141 | ||
8e95a202 JP |
142 | if (opt_len < CILEN_DEFLATE || |
143 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
144 | options[1] != CILEN_DEFLATE || | |
145 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
146 | DEFLATE_SIZE(options[2]) != state->w_size || | |
147 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
148 | return 0; |
149 | ||
150 | state->seqno = 0; | |
151 | state->unit = unit; | |
152 | state->debug = debug; | |
153 | ||
154 | zlib_deflateReset(&state->strm); | |
155 | ||
156 | return 1; | |
157 | } | |
158 | ||
159 | /** | |
160 | * z_comp_reset - reset a previously-allocated compressor. | |
161 | * @arg: pointer to private state for the compressor. | |
162 | * | |
163 | * This clears the history for the compressor and makes it | |
164 | * ready to start emitting a new compressed stream. | |
165 | */ | |
166 | static void z_comp_reset(void *arg) | |
167 | { | |
168 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
169 | ||
170 | state->seqno = 0; | |
171 | zlib_deflateReset(&state->strm); | |
172 | } | |
173 | ||
174 | /** | |
175 | * z_compress - compress a PPP packet with Deflate compression. | |
176 | * @arg: pointer to private state for the compressor | |
177 | * @rptr: uncompressed packet (input) | |
178 | * @obuf: compressed packet (output) | |
179 | * @isize: size of uncompressed packet | |
180 | * @osize: space available at @obuf | |
181 | * | |
182 | * Returns the length of the compressed packet, or 0 if the | |
183 | * packet is incompressible. | |
184 | */ | |
3c582b30 | 185 | static int z_compress(void *arg, unsigned char *rptr, unsigned char *obuf, |
1da177e4 LT |
186 | int isize, int osize) |
187 | { | |
188 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
189 | int r, proto, off, olen, oavail; | |
190 | unsigned char *wptr; | |
191 | ||
192 | /* | |
193 | * Check that the protocol is in the range we handle. | |
194 | */ | |
195 | proto = PPP_PROTOCOL(rptr); | |
196 | if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) | |
197 | return 0; | |
198 | ||
199 | /* Don't generate compressed packets which are larger than | |
200 | the uncompressed packet. */ | |
201 | if (osize > isize) | |
202 | osize = isize; | |
203 | ||
204 | wptr = obuf; | |
205 | ||
206 | /* | |
207 | * Copy over the PPP header and store the 2-byte sequence number. | |
208 | */ | |
209 | wptr[0] = PPP_ADDRESS(rptr); | |
210 | wptr[1] = PPP_CONTROL(rptr); | |
96545aeb | 211 | put_unaligned_be16(PPP_COMP, wptr + 2); |
1da177e4 | 212 | wptr += PPP_HDRLEN; |
96545aeb | 213 | put_unaligned_be16(state->seqno, wptr); |
1da177e4 LT |
214 | wptr += DEFLATE_OVHD; |
215 | olen = PPP_HDRLEN + DEFLATE_OVHD; | |
216 | state->strm.next_out = wptr; | |
217 | state->strm.avail_out = oavail = osize - olen; | |
218 | ++state->seqno; | |
219 | ||
220 | off = (proto > 0xff) ? 2 : 3; /* skip 1st proto byte if 0 */ | |
221 | rptr += off; | |
222 | state->strm.next_in = rptr; | |
223 | state->strm.avail_in = (isize - off); | |
224 | ||
225 | for (;;) { | |
226 | r = zlib_deflate(&state->strm, Z_PACKET_FLUSH); | |
227 | if (r != Z_OK) { | |
228 | if (state->debug) | |
229 | printk(KERN_ERR | |
230 | "z_compress: deflate returned %d\n", r); | |
231 | break; | |
232 | } | |
233 | if (state->strm.avail_out == 0) { | |
234 | olen += oavail; | |
235 | state->strm.next_out = NULL; | |
236 | state->strm.avail_out = oavail = 1000000; | |
237 | } else { | |
238 | break; /* all done */ | |
239 | } | |
240 | } | |
241 | olen += oavail - state->strm.avail_out; | |
242 | ||
243 | /* | |
244 | * See if we managed to reduce the size of the packet. | |
245 | */ | |
e2a4800e | 246 | if (olen < isize && olen <= osize) { |
1da177e4 LT |
247 | state->stats.comp_bytes += olen; |
248 | state->stats.comp_packets++; | |
249 | } else { | |
250 | state->stats.inc_bytes += isize; | |
251 | state->stats.inc_packets++; | |
252 | olen = 0; | |
253 | } | |
254 | state->stats.unc_bytes += isize; | |
255 | state->stats.unc_packets++; | |
256 | ||
257 | return olen; | |
258 | } | |
259 | ||
260 | /** | |
261 | * z_comp_stats - return compression statistics for a compressor | |
262 | * or decompressor. | |
263 | * @arg: pointer to private space for the (de)compressor | |
264 | * @stats: pointer to a struct compstat to receive the result. | |
265 | */ | |
266 | static void z_comp_stats(void *arg, struct compstat *stats) | |
267 | { | |
268 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
269 | ||
270 | *stats = state->stats; | |
271 | } | |
272 | ||
273 | /** | |
274 | * z_decomp_free - Free the memory used by a decompressor. | |
275 | * @arg: pointer to private space for the decompressor. | |
276 | */ | |
277 | static void z_decomp_free(void *arg) | |
278 | { | |
279 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
280 | ||
281 | if (state) { | |
7ab24bfd | 282 | vfree(state->strm.workspace); |
1da177e4 LT |
283 | kfree(state); |
284 | } | |
285 | } | |
286 | ||
287 | /** | |
288 | * z_decomp_alloc - allocate space for a decompressor. | |
289 | * @options: pointer to CCP option data | |
290 | * @opt_len: length of the CCP option at @options. | |
291 | * | |
292 | * The @options pointer points to the a buffer containing the | |
293 | * CCP option data for the compression being negotiated. It is | |
294 | * formatted according to RFC1979, and describes the window | |
295 | * size that we are requesting the peer to use in compressing | |
296 | * data to be sent to us. | |
297 | * | |
298 | * Returns the pointer to the private state for the decompressor, | |
299 | * or NULL if we could not allocate enough memory. | |
300 | */ | |
301 | static void *z_decomp_alloc(unsigned char *options, int opt_len) | |
302 | { | |
303 | struct ppp_deflate_state *state; | |
304 | int w_size; | |
305 | ||
8e95a202 JP |
306 | if (opt_len != CILEN_DEFLATE || |
307 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
308 | options[1] != CILEN_DEFLATE || | |
309 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
310 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
311 | return NULL; |
312 | w_size = DEFLATE_SIZE(options[2]); | |
313 | if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE) | |
314 | return NULL; | |
315 | ||
dd00cc48 | 316 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
317 | if (state == NULL) |
318 | return NULL; | |
319 | ||
1da177e4 LT |
320 | state->w_size = w_size; |
321 | state->strm.next_out = NULL; | |
7ab24bfd | 322 | state->strm.workspace = vmalloc(zlib_inflate_workspacesize()); |
1da177e4 LT |
323 | if (state->strm.workspace == NULL) |
324 | goto out_free; | |
325 | ||
326 | if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK) | |
327 | goto out_free; | |
328 | return (void *) state; | |
329 | ||
330 | out_free: | |
331 | z_decomp_free(state); | |
332 | return NULL; | |
333 | } | |
334 | ||
335 | /** | |
336 | * z_decomp_init - initialize a previously-allocated decompressor. | |
337 | * @arg: pointer to the private state for the decompressor | |
338 | * @options: pointer to the CCP option data describing the | |
339 | * compression that was negotiated with the peer | |
340 | * @opt_len: length of the CCP option data at @options | |
341 | * @unit: PPP unit number for diagnostic messages | |
342 | * @hdrlen: ignored (present for backwards compatibility) | |
343 | * @mru: maximum length of decompressed packets | |
344 | * @debug: debug flag; if non-zero, debug messages are printed. | |
345 | * | |
346 | * The CCP options described by @options must match the options | |
347 | * specified when the decompressor was allocated. The decompressor | |
348 | * history is reset. Returns 0 for failure (CCP options don't | |
349 | * match) or 1 for success. | |
350 | */ | |
351 | static int z_decomp_init(void *arg, unsigned char *options, int opt_len, | |
352 | int unit, int hdrlen, int mru, int debug) | |
353 | { | |
354 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
355 | ||
8e95a202 JP |
356 | if (opt_len < CILEN_DEFLATE || |
357 | (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) || | |
358 | options[1] != CILEN_DEFLATE || | |
359 | DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL || | |
360 | DEFLATE_SIZE(options[2]) != state->w_size || | |
361 | options[3] != DEFLATE_CHK_SEQUENCE) | |
1da177e4 LT |
362 | return 0; |
363 | ||
364 | state->seqno = 0; | |
365 | state->unit = unit; | |
366 | state->debug = debug; | |
367 | state->mru = mru; | |
368 | ||
369 | zlib_inflateReset(&state->strm); | |
370 | ||
371 | return 1; | |
372 | } | |
373 | ||
374 | /** | |
375 | * z_decomp_reset - reset a previously-allocated decompressor. | |
376 | * @arg: pointer to private state for the decompressor. | |
377 | * | |
378 | * This clears the history for the decompressor and makes it | |
379 | * ready to receive a new compressed stream. | |
380 | */ | |
381 | static void z_decomp_reset(void *arg) | |
382 | { | |
383 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
384 | ||
385 | state->seqno = 0; | |
386 | zlib_inflateReset(&state->strm); | |
387 | } | |
388 | ||
389 | /** | |
390 | * z_decompress - decompress a Deflate-compressed packet. | |
391 | * @arg: pointer to private state for the decompressor | |
392 | * @ibuf: pointer to input (compressed) packet data | |
393 | * @isize: length of input packet | |
394 | * @obuf: pointer to space for output (decompressed) packet | |
395 | * @osize: amount of space available at @obuf | |
396 | * | |
397 | * Because of patent problems, we return DECOMP_ERROR for errors | |
398 | * found by inspecting the input data and for system problems, but | |
399 | * DECOMP_FATALERROR for any errors which could possibly be said to | |
400 | * be being detected "after" decompression. For DECOMP_ERROR, | |
401 | * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be | |
402 | * infringing a patent of Motorola's if we do, so we take CCP down | |
403 | * instead. | |
404 | * | |
405 | * Given that the frame has the correct sequence number and a good FCS, | |
406 | * errors such as invalid codes in the input most likely indicate a | |
407 | * bug, so we return DECOMP_FATALERROR for them in order to turn off | |
408 | * compression, even though they are detected by inspecting the input. | |
409 | */ | |
3c582b30 | 410 | static int z_decompress(void *arg, unsigned char *ibuf, int isize, |
1da177e4 LT |
411 | unsigned char *obuf, int osize) |
412 | { | |
413 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
414 | int olen, seq, r; | |
415 | int decode_proto, overflow; | |
416 | unsigned char overflow_buf[1]; | |
417 | ||
418 | if (isize <= PPP_HDRLEN + DEFLATE_OVHD) { | |
419 | if (state->debug) | |
420 | printk(KERN_DEBUG "z_decompress%d: short pkt (%d)\n", | |
421 | state->unit, isize); | |
422 | return DECOMP_ERROR; | |
423 | } | |
424 | ||
425 | /* Check the sequence number. */ | |
96545aeb | 426 | seq = get_unaligned_be16(ibuf + PPP_HDRLEN); |
1da177e4 LT |
427 | if (seq != (state->seqno & 0xffff)) { |
428 | if (state->debug) | |
429 | printk(KERN_DEBUG "z_decompress%d: bad seq # %d, expected %d\n", | |
430 | state->unit, seq, state->seqno & 0xffff); | |
431 | return DECOMP_ERROR; | |
432 | } | |
433 | ++state->seqno; | |
434 | ||
435 | /* | |
436 | * Fill in the first part of the PPP header. The protocol field | |
437 | * comes from the decompressed data. | |
438 | */ | |
439 | obuf[0] = PPP_ADDRESS(ibuf); | |
440 | obuf[1] = PPP_CONTROL(ibuf); | |
441 | obuf[2] = 0; | |
442 | ||
443 | /* | |
444 | * Set up to call inflate. We set avail_out to 1 initially so we can | |
445 | * look at the first byte of the output and decide whether we have | |
446 | * a 1-byte or 2-byte protocol field. | |
447 | */ | |
448 | state->strm.next_in = ibuf + PPP_HDRLEN + DEFLATE_OVHD; | |
449 | state->strm.avail_in = isize - (PPP_HDRLEN + DEFLATE_OVHD); | |
450 | state->strm.next_out = obuf + 3; | |
451 | state->strm.avail_out = 1; | |
452 | decode_proto = 1; | |
453 | overflow = 0; | |
454 | ||
455 | /* | |
456 | * Call inflate, supplying more input or output as needed. | |
457 | */ | |
458 | for (;;) { | |
459 | r = zlib_inflate(&state->strm, Z_PACKET_FLUSH); | |
460 | if (r != Z_OK) { | |
461 | if (state->debug) | |
462 | printk(KERN_DEBUG "z_decompress%d: inflate returned %d (%s)\n", | |
463 | state->unit, r, (state->strm.msg? state->strm.msg: "")); | |
464 | return DECOMP_FATALERROR; | |
465 | } | |
466 | if (state->strm.avail_out != 0) | |
467 | break; /* all done */ | |
468 | if (decode_proto) { | |
469 | state->strm.avail_out = osize - PPP_HDRLEN; | |
470 | if ((obuf[3] & 1) == 0) { | |
471 | /* 2-byte protocol field */ | |
472 | obuf[2] = obuf[3]; | |
473 | --state->strm.next_out; | |
474 | ++state->strm.avail_out; | |
475 | } | |
476 | decode_proto = 0; | |
477 | } else if (!overflow) { | |
478 | /* | |
479 | * We've filled up the output buffer; the only way to | |
480 | * find out whether inflate has any more characters | |
481 | * left is to give it another byte of output space. | |
482 | */ | |
483 | state->strm.next_out = overflow_buf; | |
484 | state->strm.avail_out = 1; | |
485 | overflow = 1; | |
486 | } else { | |
487 | if (state->debug) | |
488 | printk(KERN_DEBUG "z_decompress%d: ran out of mru\n", | |
489 | state->unit); | |
490 | return DECOMP_FATALERROR; | |
491 | } | |
492 | } | |
493 | ||
494 | if (decode_proto) { | |
495 | if (state->debug) | |
496 | printk(KERN_DEBUG "z_decompress%d: didn't get proto\n", | |
497 | state->unit); | |
498 | return DECOMP_ERROR; | |
499 | } | |
500 | ||
501 | olen = osize + overflow - state->strm.avail_out; | |
502 | state->stats.unc_bytes += olen; | |
503 | state->stats.unc_packets++; | |
504 | state->stats.comp_bytes += isize; | |
505 | state->stats.comp_packets++; | |
506 | ||
507 | return olen; | |
508 | } | |
509 | ||
510 | /** | |
511 | * z_incomp - add incompressible input data to the history. | |
512 | * @arg: pointer to private state for the decompressor | |
513 | * @ibuf: pointer to input packet data | |
514 | * @icnt: length of input data. | |
515 | */ | |
516 | static void z_incomp(void *arg, unsigned char *ibuf, int icnt) | |
517 | { | |
518 | struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg; | |
519 | int proto, r; | |
520 | ||
521 | /* | |
522 | * Check that the protocol is one we handle. | |
523 | */ | |
524 | proto = PPP_PROTOCOL(ibuf); | |
525 | if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) | |
526 | return; | |
527 | ||
528 | ++state->seqno; | |
529 | ||
530 | /* | |
531 | * We start at the either the 1st or 2nd byte of the protocol field, | |
532 | * depending on whether the protocol value is compressible. | |
533 | */ | |
534 | state->strm.next_in = ibuf + 3; | |
535 | state->strm.avail_in = icnt - 3; | |
536 | if (proto > 0xff) { | |
537 | --state->strm.next_in; | |
538 | ++state->strm.avail_in; | |
539 | } | |
540 | ||
541 | r = zlib_inflateIncomp(&state->strm); | |
542 | if (r != Z_OK) { | |
543 | /* gak! */ | |
544 | if (state->debug) { | |
545 | printk(KERN_DEBUG "z_incomp%d: inflateIncomp returned %d (%s)\n", | |
546 | state->unit, r, (state->strm.msg? state->strm.msg: "")); | |
547 | } | |
548 | return; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Update stats. | |
553 | */ | |
554 | state->stats.inc_bytes += icnt; | |
555 | state->stats.inc_packets++; | |
556 | state->stats.unc_bytes += icnt; | |
557 | state->stats.unc_packets++; | |
558 | } | |
559 | ||
560 | /************************************************************* | |
561 | * Module interface table | |
562 | *************************************************************/ | |
563 | ||
564 | /* These are in ppp_generic.c */ | |
565 | extern int ppp_register_compressor (struct compressor *cp); | |
566 | extern void ppp_unregister_compressor (struct compressor *cp); | |
567 | ||
568 | /* | |
569 | * Procedures exported to if_ppp.c. | |
570 | */ | |
571 | static struct compressor ppp_deflate = { | |
572 | .compress_proto = CI_DEFLATE, | |
573 | .comp_alloc = z_comp_alloc, | |
574 | .comp_free = z_comp_free, | |
575 | .comp_init = z_comp_init, | |
576 | .comp_reset = z_comp_reset, | |
577 | .compress = z_compress, | |
578 | .comp_stat = z_comp_stats, | |
579 | .decomp_alloc = z_decomp_alloc, | |
580 | .decomp_free = z_decomp_free, | |
581 | .decomp_init = z_decomp_init, | |
582 | .decomp_reset = z_decomp_reset, | |
583 | .decompress = z_decompress, | |
584 | .incomp = z_incomp, | |
585 | .decomp_stat = z_comp_stats, | |
586 | .owner = THIS_MODULE | |
587 | }; | |
588 | ||
589 | static struct compressor ppp_deflate_draft = { | |
590 | .compress_proto = CI_DEFLATE_DRAFT, | |
591 | .comp_alloc = z_comp_alloc, | |
592 | .comp_free = z_comp_free, | |
593 | .comp_init = z_comp_init, | |
594 | .comp_reset = z_comp_reset, | |
595 | .compress = z_compress, | |
596 | .comp_stat = z_comp_stats, | |
597 | .decomp_alloc = z_decomp_alloc, | |
598 | .decomp_free = z_decomp_free, | |
599 | .decomp_init = z_decomp_init, | |
600 | .decomp_reset = z_decomp_reset, | |
601 | .decompress = z_decompress, | |
602 | .incomp = z_incomp, | |
603 | .decomp_stat = z_comp_stats, | |
604 | .owner = THIS_MODULE | |
605 | }; | |
606 | ||
607 | static int __init deflate_init(void) | |
6aa20a22 | 608 | { |
3ebe1bca Y |
609 | int rc; |
610 | ||
611 | rc = ppp_register_compressor(&ppp_deflate); | |
612 | if (rc) | |
613 | return rc; | |
614 | ||
615 | rc = ppp_register_compressor(&ppp_deflate_draft); | |
616 | if (rc) { | |
617 | ppp_unregister_compressor(&ppp_deflate); | |
618 | return rc; | |
619 | } | |
620 | ||
621 | pr_info("PPP Deflate Compression module registered\n"); | |
622 | return 0; | |
1da177e4 | 623 | } |
6aa20a22 | 624 | |
1da177e4 LT |
625 | static void __exit deflate_cleanup(void) |
626 | { | |
627 | ppp_unregister_compressor(&ppp_deflate); | |
628 | ppp_unregister_compressor(&ppp_deflate_draft); | |
629 | } | |
630 | ||
631 | module_init(deflate_init); | |
632 | module_exit(deflate_cleanup); | |
e1e5ef2a | 633 | MODULE_DESCRIPTION("PPP Deflate compression module"); |
1da177e4 LT |
634 | MODULE_LICENSE("Dual BSD/GPL"); |
635 | MODULE_ALIAS("ppp-compress-" __stringify(CI_DEFLATE)); | |
636 | MODULE_ALIAS("ppp-compress-" __stringify(CI_DEFLATE_DRAFT)); |