2 * ppp_mppe.c - interface MPPE to the PPP code.
3 * This version is for use with Linux kernel 2.6.14+
5 * By Frank Cusack <fcusack@fcusack.com>.
6 * Copyright (c) 2002,2003,2004 Google, Inc.
10 * Permission to use, copy, modify, and distribute this software and its
11 * documentation is hereby granted, provided that the above copyright
12 * notice appears in all copies. This software is provided without any
13 * warranty, express or implied.
15 * ALTERNATIVELY, provided that this notice is retained in full, this product
16 * may be distributed under the terms of the GNU General Public License (GPL),
17 * in which case the provisions of the GPL apply INSTEAD OF those given above.
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 * 08/12/05 - Matt Domsch <Matt_Domsch@dell.com>
36 * Only need extra skb padding on transmit, not receive.
37 * 06/18/04 - Matt Domsch <Matt_Domsch@dell.com>, Oleg Makarenko <mole@quadra.ru>
38 * Use Linux kernel 2.6 arc4 and sha1 routines rather than
40 * 2/15/04 - TS: added #include <version.h> and testing for Kernel
41 * version before using
42 * MOD_DEC_USAGE_COUNT/MOD_INC_USAGE_COUNT which are
46 #include <linux/err.h>
47 #include <linux/module.h>
48 #include <linux/kernel.h>
49 #include <linux/version.h>
50 #include <linux/init.h>
51 #include <linux/types.h>
52 #include <linux/slab.h>
53 #include <linux/string.h>
54 #include <linux/crypto.h>
56 #include <linux/ppp_defs.h>
57 #include <linux/ppp-comp.h>
58 #include <linux/scatterlist.h>
62 MODULE_AUTHOR("Frank Cusack <fcusack@fcusack.com>");
63 MODULE_DESCRIPTION("Point-to-Point Protocol Microsoft Point-to-Point Encryption support");
64 MODULE_LICENSE("Dual BSD/GPL");
65 MODULE_ALIAS("ppp-compress-" __stringify(CI_MPPE
));
66 MODULE_VERSION("1.0.2");
69 setup_sg(struct scatterlist
*sg
, const void *address
, unsigned int length
)
71 sg_set_buf(sg
, address
, length
);
75 #define SHA1_PAD_SIZE 40
78 * kernel crypto API needs its arguments to be in kmalloc'd memory, not in the module
79 * static data area. That means sha_pad needs to be kmalloc'd.
83 unsigned char sha_pad1
[SHA1_PAD_SIZE
];
84 unsigned char sha_pad2
[SHA1_PAD_SIZE
];
86 static struct sha_pad
*sha_pad
;
88 static inline void sha_pad_init(struct sha_pad
*shapad
)
90 memset(shapad
->sha_pad1
, 0x00, sizeof(shapad
->sha_pad1
));
91 memset(shapad
->sha_pad2
, 0xF2, sizeof(shapad
->sha_pad2
));
95 * State for an MPPE (de)compressor.
97 struct ppp_mppe_state
{
98 struct crypto_blkcipher
*arc4
;
99 struct crypto_hash
*sha1
;
100 unsigned char *sha1_digest
;
101 unsigned char master_key
[MPPE_MAX_KEY_LEN
];
102 unsigned char session_key
[MPPE_MAX_KEY_LEN
];
103 unsigned keylen
; /* key length in bytes */
104 /* NB: 128-bit == 16, 40-bit == 8! */
105 /* If we want to support 56-bit, */
106 /* the unit has to change to bits */
107 unsigned char bits
; /* MPPE control bits */
108 unsigned ccount
; /* 12-bit coherency count (seqno) */
109 unsigned stateful
; /* stateful mode flag */
110 int discard
; /* stateful mode packet loss flag */
111 int sanity_errors
; /* take down LCP if too many */
114 struct compstat stats
;
117 /* struct ppp_mppe_state.bits definitions */
118 #define MPPE_BIT_A 0x80 /* Encryption table were (re)inititalized */
119 #define MPPE_BIT_B 0x40 /* MPPC only (not implemented) */
120 #define MPPE_BIT_C 0x20 /* MPPC only (not implemented) */
121 #define MPPE_BIT_D 0x10 /* This is an encrypted frame */
123 #define MPPE_BIT_FLUSHED MPPE_BIT_A
124 #define MPPE_BIT_ENCRYPTED MPPE_BIT_D
126 #define MPPE_BITS(p) ((p)[4] & 0xf0)
127 #define MPPE_CCOUNT(p) ((((p)[4] & 0x0f) << 8) + (p)[5])
128 #define MPPE_CCOUNT_SPACE 0x1000 /* The size of the ccount space */
130 #define MPPE_OVHD 2 /* MPPE overhead/packet */
131 #define SANITY_MAX 1600 /* Max bogon factor we will tolerate */
134 * Key Derivation, from RFC 3078, RFC 3079.
135 * Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
137 static void get_new_key_from_sha(struct ppp_mppe_state
* state
)
139 struct hash_desc desc
;
140 struct scatterlist sg
[4];
143 sg_init_table(sg
, 4);
145 nbytes
= setup_sg(&sg
[0], state
->master_key
, state
->keylen
);
146 nbytes
+= setup_sg(&sg
[1], sha_pad
->sha_pad1
,
147 sizeof(sha_pad
->sha_pad1
));
148 nbytes
+= setup_sg(&sg
[2], state
->session_key
, state
->keylen
);
149 nbytes
+= setup_sg(&sg
[3], sha_pad
->sha_pad2
,
150 sizeof(sha_pad
->sha_pad2
));
152 desc
.tfm
= state
->sha1
;
155 crypto_hash_digest(&desc
, sg
, nbytes
, state
->sha1_digest
);
159 * Perform the MPPE rekey algorithm, from RFC 3078, sec. 7.3.
160 * Well, not what's written there, but rather what they meant.
162 static void mppe_rekey(struct ppp_mppe_state
* state
, int initial_key
)
164 struct scatterlist sg_in
[1], sg_out
[1];
165 struct blkcipher_desc desc
= { .tfm
= state
->arc4
};
167 get_new_key_from_sha(state
);
169 crypto_blkcipher_setkey(state
->arc4
, state
->sha1_digest
,
171 sg_init_table(sg_in
, 1);
172 sg_init_table(sg_out
, 1);
173 setup_sg(sg_in
, state
->sha1_digest
, state
->keylen
);
174 setup_sg(sg_out
, state
->session_key
, state
->keylen
);
175 if (crypto_blkcipher_encrypt(&desc
, sg_out
, sg_in
,
176 state
->keylen
) != 0) {
177 printk(KERN_WARNING
"mppe_rekey: cipher_encrypt failed\n");
180 memcpy(state
->session_key
, state
->sha1_digest
, state
->keylen
);
182 if (state
->keylen
== 8) {
184 state
->session_key
[0] = 0xd1;
185 state
->session_key
[1] = 0x26;
186 state
->session_key
[2] = 0x9e;
188 crypto_blkcipher_setkey(state
->arc4
, state
->session_key
, state
->keylen
);
192 * Allocate space for a (de)compressor.
194 static void *mppe_alloc(unsigned char *options
, int optlen
)
196 struct ppp_mppe_state
*state
;
197 unsigned int digestsize
;
199 if (optlen
!= CILEN_MPPE
+ sizeof(state
->master_key
)
200 || options
[0] != CI_MPPE
|| options
[1] != CILEN_MPPE
)
203 state
= kzalloc(sizeof(*state
), GFP_KERNEL
);
208 state
->arc4
= crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC
);
209 if (IS_ERR(state
->arc4
)) {
214 state
->sha1
= crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC
);
215 if (IS_ERR(state
->sha1
)) {
220 digestsize
= crypto_hash_digestsize(state
->sha1
);
221 if (digestsize
< MPPE_MAX_KEY_LEN
)
224 state
->sha1_digest
= kmalloc(digestsize
, GFP_KERNEL
);
225 if (!state
->sha1_digest
)
229 memcpy(state
->master_key
, &options
[CILEN_MPPE
],
230 sizeof(state
->master_key
));
231 memcpy(state
->session_key
, state
->master_key
,
232 sizeof(state
->master_key
));
235 * We defer initial key generation until mppe_init(), as mppe_alloc()
236 * is called frequently during negotiation.
239 return (void *)state
;
242 if (state
->sha1_digest
)
243 kfree(state
->sha1_digest
);
245 crypto_free_hash(state
->sha1
);
247 crypto_free_blkcipher(state
->arc4
);
254 * Deallocate space for a (de)compressor.
256 static void mppe_free(void *arg
)
258 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
260 if (state
->sha1_digest
)
261 kfree(state
->sha1_digest
);
263 crypto_free_hash(state
->sha1
);
265 crypto_free_blkcipher(state
->arc4
);
271 * Initialize (de)compressor state.
274 mppe_init(void *arg
, unsigned char *options
, int optlen
, int unit
, int debug
,
275 const char *debugstr
)
277 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
278 unsigned char mppe_opts
;
280 if (optlen
!= CILEN_MPPE
281 || options
[0] != CI_MPPE
|| options
[1] != CILEN_MPPE
)
284 MPPE_CI_TO_OPTS(&options
[2], mppe_opts
);
285 if (mppe_opts
& MPPE_OPT_128
)
287 else if (mppe_opts
& MPPE_OPT_40
)
290 printk(KERN_WARNING
"%s[%d]: unknown key length\n", debugstr
,
294 if (mppe_opts
& MPPE_OPT_STATEFUL
)
297 /* Generate the initial session key. */
298 mppe_rekey(state
, 1);
302 char mkey
[sizeof(state
->master_key
) * 2 + 1];
303 char skey
[sizeof(state
->session_key
) * 2 + 1];
305 printk(KERN_DEBUG
"%s[%d]: initialized with %d-bit %s mode\n",
306 debugstr
, unit
, (state
->keylen
== 16) ? 128 : 40,
307 (state
->stateful
) ? "stateful" : "stateless");
309 for (i
= 0; i
< sizeof(state
->master_key
); i
++)
310 sprintf(mkey
+ i
* 2, "%02x", state
->master_key
[i
]);
311 for (i
= 0; i
< sizeof(state
->session_key
); i
++)
312 sprintf(skey
+ i
* 2, "%02x", state
->session_key
[i
]);
314 "%s[%d]: keys: master: %s initial session: %s\n",
315 debugstr
, unit
, mkey
, skey
);
319 * Initialize the coherency count. The initial value is not specified
320 * in RFC 3078, but we can make a reasonable assumption that it will
321 * start at 0. Setting it to the max here makes the comp/decomp code
322 * do the right thing (determined through experiment).
324 state
->ccount
= MPPE_CCOUNT_SPACE
- 1;
327 * Note that even though we have initialized the key table, we don't
328 * set the FLUSHED bit. This is contrary to RFC 3078, sec. 3.1.
330 state
->bits
= MPPE_BIT_ENCRYPTED
;
333 state
->debug
= debug
;
339 mppe_comp_init(void *arg
, unsigned char *options
, int optlen
, int unit
,
340 int hdrlen
, int debug
)
343 return mppe_init(arg
, options
, optlen
, unit
, debug
, "mppe_comp_init");
347 * We received a CCP Reset-Request (actually, we are sending a Reset-Ack),
348 * tell the compressor to rekey. Note that we MUST NOT rekey for
349 * every CCP Reset-Request; we only rekey on the next xmit packet.
350 * We might get multiple CCP Reset-Requests if our CCP Reset-Ack is lost.
351 * So, rekeying for every CCP Reset-Request is broken as the peer will not
352 * know how many times we've rekeyed. (If we rekey and THEN get another
353 * CCP Reset-Request, we must rekey again.)
355 static void mppe_comp_reset(void *arg
)
357 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
359 state
->bits
|= MPPE_BIT_FLUSHED
;
363 * Compress (encrypt) a packet.
364 * It's strange to call this a compressor, since the output is always
365 * MPPE_OVHD + 2 bytes larger than the input.
368 mppe_compress(void *arg
, unsigned char *ibuf
, unsigned char *obuf
,
369 int isize
, int osize
)
371 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
372 struct blkcipher_desc desc
= { .tfm
= state
->arc4
};
374 struct scatterlist sg_in
[1], sg_out
[1];
377 * Check that the protocol is in the range we handle.
379 proto
= PPP_PROTOCOL(ibuf
);
380 if (proto
< 0x0021 || proto
> 0x00fa)
383 /* Make sure we have enough room to generate an encrypted packet. */
384 if (osize
< isize
+ MPPE_OVHD
+ 2) {
385 /* Drop the packet if we should encrypt it, but can't. */
386 printk(KERN_DEBUG
"mppe_compress[%d]: osize too small! "
387 "(have: %d need: %d)\n", state
->unit
,
388 osize
, osize
+ MPPE_OVHD
+ 2);
392 osize
= isize
+ MPPE_OVHD
+ 2;
395 * Copy over the PPP header and set control bits.
397 obuf
[0] = PPP_ADDRESS(ibuf
);
398 obuf
[1] = PPP_CONTROL(ibuf
);
399 obuf
[2] = PPP_COMP
>> 8; /* isize + MPPE_OVHD + 1 */
400 obuf
[3] = PPP_COMP
; /* isize + MPPE_OVHD + 2 */
403 state
->ccount
= (state
->ccount
+ 1) % MPPE_CCOUNT_SPACE
;
404 if (state
->debug
>= 7)
405 printk(KERN_DEBUG
"mppe_compress[%d]: ccount %d\n", state
->unit
,
407 obuf
[0] = state
->ccount
>> 8;
408 obuf
[1] = state
->ccount
& 0xff;
410 if (!state
->stateful
|| /* stateless mode */
411 ((state
->ccount
& 0xff) == 0xff) || /* "flag" packet */
412 (state
->bits
& MPPE_BIT_FLUSHED
)) { /* CCP Reset-Request */
414 if (state
->debug
&& state
->stateful
)
415 printk(KERN_DEBUG
"mppe_compress[%d]: rekeying\n",
417 mppe_rekey(state
, 0);
418 state
->bits
|= MPPE_BIT_FLUSHED
;
420 obuf
[0] |= state
->bits
;
421 state
->bits
&= ~MPPE_BIT_FLUSHED
; /* reset for next xmit */
424 ibuf
+= 2; /* skip to proto field */
428 sg_init_table(sg_in
, 1);
429 sg_init_table(sg_out
, 1);
430 setup_sg(sg_in
, ibuf
, isize
);
431 setup_sg(sg_out
, obuf
, osize
);
432 if (crypto_blkcipher_encrypt(&desc
, sg_out
, sg_in
, isize
) != 0) {
433 printk(KERN_DEBUG
"crypto_cypher_encrypt failed\n");
437 state
->stats
.unc_bytes
+= isize
;
438 state
->stats
.unc_packets
++;
439 state
->stats
.comp_bytes
+= osize
;
440 state
->stats
.comp_packets
++;
446 * Since every frame grows by MPPE_OVHD + 2 bytes, this is always going
447 * to look bad ... and the longer the link is up the worse it will get.
449 static void mppe_comp_stats(void *arg
, struct compstat
*stats
)
451 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
453 *stats
= state
->stats
;
457 mppe_decomp_init(void *arg
, unsigned char *options
, int optlen
, int unit
,
458 int hdrlen
, int mru
, int debug
)
461 return mppe_init(arg
, options
, optlen
, unit
, debug
, "mppe_decomp_init");
465 * We received a CCP Reset-Ack. Just ignore it.
467 static void mppe_decomp_reset(void *arg
)
474 * Decompress (decrypt) an MPPE packet.
477 mppe_decompress(void *arg
, unsigned char *ibuf
, int isize
, unsigned char *obuf
,
480 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
481 struct blkcipher_desc desc
= { .tfm
= state
->arc4
};
483 int flushed
= MPPE_BITS(ibuf
) & MPPE_BIT_FLUSHED
;
485 struct scatterlist sg_in
[1], sg_out
[1];
487 if (isize
<= PPP_HDRLEN
+ MPPE_OVHD
) {
490 "mppe_decompress[%d]: short pkt (%d)\n",
496 * Make sure we have enough room to decrypt the packet.
497 * Note that for our test we only subtract 1 byte whereas in
498 * mppe_compress() we added 2 bytes (+MPPE_OVHD);
499 * this is to account for possible PFC.
501 if (osize
< isize
- MPPE_OVHD
- 1) {
502 printk(KERN_DEBUG
"mppe_decompress[%d]: osize too small! "
503 "(have: %d need: %d)\n", state
->unit
,
504 osize
, isize
- MPPE_OVHD
- 1);
507 osize
= isize
- MPPE_OVHD
- 2; /* assume no PFC */
509 ccount
= MPPE_CCOUNT(ibuf
);
510 if (state
->debug
>= 7)
511 printk(KERN_DEBUG
"mppe_decompress[%d]: ccount %d\n",
512 state
->unit
, ccount
);
514 /* sanity checks -- terminate with extreme prejudice */
515 if (!(MPPE_BITS(ibuf
) & MPPE_BIT_ENCRYPTED
)) {
517 "mppe_decompress[%d]: ENCRYPTED bit not set!\n",
519 state
->sanity_errors
+= 100;
522 if (!state
->stateful
&& !flushed
) {
523 printk(KERN_DEBUG
"mppe_decompress[%d]: FLUSHED bit not set in "
524 "stateless mode!\n", state
->unit
);
525 state
->sanity_errors
+= 100;
528 if (state
->stateful
&& ((ccount
& 0xff) == 0xff) && !flushed
) {
529 printk(KERN_DEBUG
"mppe_decompress[%d]: FLUSHED bit not set on "
530 "flag packet!\n", state
->unit
);
531 state
->sanity_errors
+= 100;
536 if (state
->sanity_errors
< SANITY_MAX
)
540 * Take LCP down if the peer is sending too many bogons.
541 * We don't want to do this for a single or just a few
542 * instances since it could just be due to packet corruption.
544 return DECOMP_FATALERROR
;
548 * Check the coherency count.
551 if (!state
->stateful
) {
552 /* RFC 3078, sec 8.1. Rekey for every packet. */
553 while (state
->ccount
!= ccount
) {
554 mppe_rekey(state
, 0);
555 state
->ccount
= (state
->ccount
+ 1) % MPPE_CCOUNT_SPACE
;
558 /* RFC 3078, sec 8.2. */
559 if (!state
->discard
) {
561 state
->ccount
= (state
->ccount
+ 1) % MPPE_CCOUNT_SPACE
;
562 if (ccount
!= state
->ccount
) {
564 * (ccount > state->ccount)
565 * Packet loss detected, enter the discard state.
566 * Signal the peer to rekey (by sending a CCP Reset-Request).
574 /* ccp.c will be silent (no additional CCP Reset-Requests). */
577 /* Rekey for every missed "flag" packet. */
578 while ((ccount
& ~0xff) !=
579 (state
->ccount
& ~0xff)) {
580 mppe_rekey(state
, 0);
583 256) % MPPE_CCOUNT_SPACE
;
588 state
->ccount
= ccount
;
590 * Another problem with RFC 3078 here. It implies that the
591 * peer need not send a Reset-Ack packet. But RFC 1962
592 * requires it. Hopefully, M$ does send a Reset-Ack; even
593 * though it isn't required for MPPE synchronization, it is
594 * required to reset CCP state.
599 mppe_rekey(state
, 0);
603 * Fill in the first part of the PPP header. The protocol field
604 * comes from the decrypted data.
606 obuf
[0] = PPP_ADDRESS(ibuf
); /* +1 */
607 obuf
[1] = PPP_CONTROL(ibuf
); /* +1 */
609 ibuf
+= PPP_HDRLEN
+ MPPE_OVHD
;
610 isize
-= PPP_HDRLEN
+ MPPE_OVHD
; /* -6 */
611 /* net osize: isize-4 */
614 * Decrypt the first byte in order to check if it is
615 * a compressed or uncompressed protocol field.
617 sg_init_table(sg_in
, 1);
618 sg_init_table(sg_out
, 1);
619 setup_sg(sg_in
, ibuf
, 1);
620 setup_sg(sg_out
, obuf
, 1);
621 if (crypto_blkcipher_decrypt(&desc
, sg_out
, sg_in
, 1) != 0) {
622 printk(KERN_DEBUG
"crypto_cypher_decrypt failed\n");
627 * Do PFC decompression.
628 * This would be nicer if we were given the actual sk_buff
629 * instead of a char *.
631 if ((obuf
[0] & 0x01) != 0) {
638 /* And finally, decrypt the rest of the packet. */
639 setup_sg(sg_in
, ibuf
+ 1, isize
- 1);
640 setup_sg(sg_out
, obuf
+ 1, osize
- 1);
641 if (crypto_blkcipher_decrypt(&desc
, sg_out
, sg_in
, isize
- 1)) {
642 printk(KERN_DEBUG
"crypto_cypher_decrypt failed\n");
646 state
->stats
.unc_bytes
+= osize
;
647 state
->stats
.unc_packets
++;
648 state
->stats
.comp_bytes
+= isize
;
649 state
->stats
.comp_packets
++;
651 /* good packet credit */
652 state
->sanity_errors
>>= 1;
658 * Incompressible data has arrived (this should never happen!).
659 * We should probably drop the link if the protocol is in the range
660 * of what should be encrypted. At the least, we should drop this
661 * packet. (How to do this?)
663 static void mppe_incomp(void *arg
, unsigned char *ibuf
, int icnt
)
665 struct ppp_mppe_state
*state
= (struct ppp_mppe_state
*) arg
;
668 (PPP_PROTOCOL(ibuf
) >= 0x0021 && PPP_PROTOCOL(ibuf
) <= 0x00fa))
670 "mppe_incomp[%d]: incompressible (unencrypted) data! "
671 "(proto %04x)\n", state
->unit
, PPP_PROTOCOL(ibuf
));
673 state
->stats
.inc_bytes
+= icnt
;
674 state
->stats
.inc_packets
++;
675 state
->stats
.unc_bytes
+= icnt
;
676 state
->stats
.unc_packets
++;
679 /*************************************************************
680 * Module interface table
681 *************************************************************/
684 * Procedures exported to if_ppp.c.
686 static struct compressor ppp_mppe
= {
687 .compress_proto
= CI_MPPE
,
688 .comp_alloc
= mppe_alloc
,
689 .comp_free
= mppe_free
,
690 .comp_init
= mppe_comp_init
,
691 .comp_reset
= mppe_comp_reset
,
692 .compress
= mppe_compress
,
693 .comp_stat
= mppe_comp_stats
,
694 .decomp_alloc
= mppe_alloc
,
695 .decomp_free
= mppe_free
,
696 .decomp_init
= mppe_decomp_init
,
697 .decomp_reset
= mppe_decomp_reset
,
698 .decompress
= mppe_decompress
,
699 .incomp
= mppe_incomp
,
700 .decomp_stat
= mppe_comp_stats
,
701 .owner
= THIS_MODULE
,
702 .comp_extra
= MPPE_PAD
,
708 * Prior to allowing load, try to load the arc4 and sha1 crypto
709 * libraries. The actual use will be allocated later, but
710 * this way the module will fail to insmod if they aren't available.
713 static int __init
ppp_mppe_init(void)
716 if (!(crypto_has_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC
) &&
717 crypto_has_hash("sha1", 0, CRYPTO_ALG_ASYNC
)))
720 sha_pad
= kmalloc(sizeof(struct sha_pad
), GFP_KERNEL
);
723 sha_pad_init(sha_pad
);
725 answer
= ppp_register_compressor(&ppp_mppe
);
728 printk(KERN_INFO
"PPP MPPE Compression module registered\n");
735 static void __exit
ppp_mppe_cleanup(void)
737 ppp_unregister_compressor(&ppp_mppe
);
741 module_init(ppp_mppe_init
);
742 module_exit(ppp_mppe_cleanup
);
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