summaryrefslogtreecommitdiff
path: root/drivers/net/ppp_mppe.c
diff options
context:
space:
mode:
authorJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-07-31 02:38:19 -0700
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2011-08-27 00:58:26 -0700
commit224cf5ad14c038b13c119dff29422f178a306f54 (patch)
tree89bf411ea743e9d7bbd3c609eeb7220270a97fc5 /drivers/net/ppp_mppe.c
parentaab3ac26108642eaa06efa4697dab595c7de2bbd (diff)
ppp: Move the PPP drivers
Move the PPP drivers into drivers/net/ppp/ and make the necessary Kconfig and Makefile changes. CC: Paul Mackerras <paulus@samba.org> CC: Frank Cusack <fcusack@fcusack.com> CC: Michal Ostrowski <mostrows@speakeasy.net> CC: Michal Ostrowski <mostrows@earthlink.net> CC: Dmitry Kozlov <xeb@mail.ru> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ppp_mppe.c')
-rw-r--r--drivers/net/ppp_mppe.c740
1 files changed, 0 insertions, 740 deletions
diff --git a/drivers/net/ppp_mppe.c b/drivers/net/ppp_mppe.c
deleted file mode 100644
index 9a1849a83e2a..000000000000
--- a/drivers/net/ppp_mppe.c
+++ /dev/null
@@ -1,740 +0,0 @@
-/*
- * ppp_mppe.c - interface MPPE to the PPP code.
- * This version is for use with Linux kernel 2.6.14+
- *
- * By Frank Cusack <fcusack@fcusack.com>.
- * Copyright (c) 2002,2003,2004 Google, Inc.
- * All rights reserved.
- *
- * License:
- * 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.
- *
- * ALTERNATIVELY, provided that this notice is retained in full, this product
- * may be distributed under the terms of the GNU General Public License (GPL),
- * in which case the provisions of the GPL apply INSTEAD OF those given above.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- *
- * Changelog:
- * 08/12/05 - Matt Domsch <Matt_Domsch@dell.com>
- * Only need extra skb padding on transmit, not receive.
- * 06/18/04 - Matt Domsch <Matt_Domsch@dell.com>, Oleg Makarenko <mole@quadra.ru>
- * Use Linux kernel 2.6 arc4 and sha1 routines rather than
- * providing our own.
- * 2/15/04 - TS: added #include <version.h> and testing for Kernel
- * version before using
- * MOD_DEC_USAGE_COUNT/MOD_INC_USAGE_COUNT which are
- * deprecated in 2.6
- */
-
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/crypto.h>
-#include <linux/mm.h>
-#include <linux/ppp_defs.h>
-#include <linux/ppp-comp.h>
-#include <linux/scatterlist.h>
-#include <asm/unaligned.h>
-
-#include "ppp_mppe.h"
-
-MODULE_AUTHOR("Frank Cusack <fcusack@fcusack.com>");
-MODULE_DESCRIPTION("Point-to-Point Protocol Microsoft Point-to-Point Encryption support");
-MODULE_LICENSE("Dual BSD/GPL");
-MODULE_ALIAS("ppp-compress-" __stringify(CI_MPPE));
-MODULE_VERSION("1.0.2");
-
-static unsigned int
-setup_sg(struct scatterlist *sg, const void *address, unsigned int length)
-{
- sg_set_buf(sg, address, length);
- return length;
-}
-
-#define SHA1_PAD_SIZE 40
-
-/*
- * kernel crypto API needs its arguments to be in kmalloc'd memory, not in the module
- * static data area. That means sha_pad needs to be kmalloc'd.
- */
-
-struct sha_pad {
- unsigned char sha_pad1[SHA1_PAD_SIZE];
- unsigned char sha_pad2[SHA1_PAD_SIZE];
-};
-static struct sha_pad *sha_pad;
-
-static inline void sha_pad_init(struct sha_pad *shapad)
-{
- memset(shapad->sha_pad1, 0x00, sizeof(shapad->sha_pad1));
- memset(shapad->sha_pad2, 0xF2, sizeof(shapad->sha_pad2));
-}
-
-/*
- * State for an MPPE (de)compressor.
- */
-struct ppp_mppe_state {
- struct crypto_blkcipher *arc4;
- struct crypto_hash *sha1;
- unsigned char *sha1_digest;
- unsigned char master_key[MPPE_MAX_KEY_LEN];
- unsigned char session_key[MPPE_MAX_KEY_LEN];
- unsigned keylen; /* key length in bytes */
- /* NB: 128-bit == 16, 40-bit == 8! */
- /* If we want to support 56-bit, */
- /* the unit has to change to bits */
- unsigned char bits; /* MPPE control bits */
- unsigned ccount; /* 12-bit coherency count (seqno) */
- unsigned stateful; /* stateful mode flag */
- int discard; /* stateful mode packet loss flag */
- int sanity_errors; /* take down LCP if too many */
- int unit;
- int debug;
- struct compstat stats;
-};
-
-/* struct ppp_mppe_state.bits definitions */
-#define MPPE_BIT_A 0x80 /* Encryption table were (re)inititalized */
-#define MPPE_BIT_B 0x40 /* MPPC only (not implemented) */
-#define MPPE_BIT_C 0x20 /* MPPC only (not implemented) */
-#define MPPE_BIT_D 0x10 /* This is an encrypted frame */
-
-#define MPPE_BIT_FLUSHED MPPE_BIT_A
-#define MPPE_BIT_ENCRYPTED MPPE_BIT_D
-
-#define MPPE_BITS(p) ((p)[4] & 0xf0)
-#define MPPE_CCOUNT(p) ((((p)[4] & 0x0f) << 8) + (p)[5])
-#define MPPE_CCOUNT_SPACE 0x1000 /* The size of the ccount space */
-
-#define MPPE_OVHD 2 /* MPPE overhead/packet */
-#define SANITY_MAX 1600 /* Max bogon factor we will tolerate */
-
-/*
- * Key Derivation, from RFC 3078, RFC 3079.
- * Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
- */
-static void get_new_key_from_sha(struct ppp_mppe_state * state)
-{
- struct hash_desc desc;
- struct scatterlist sg[4];
- unsigned int nbytes;
-
- sg_init_table(sg, 4);
-
- nbytes = setup_sg(&sg[0], state->master_key, state->keylen);
- nbytes += setup_sg(&sg[1], sha_pad->sha_pad1,
- sizeof(sha_pad->sha_pad1));
- nbytes += setup_sg(&sg[2], state->session_key, state->keylen);
- nbytes += setup_sg(&sg[3], sha_pad->sha_pad2,
- sizeof(sha_pad->sha_pad2));
-
- desc.tfm = state->sha1;
- desc.flags = 0;
-
- crypto_hash_digest(&desc, sg, nbytes, state->sha1_digest);
-}
-
-/*
- * Perform the MPPE rekey algorithm, from RFC 3078, sec. 7.3.
- * Well, not what's written there, but rather what they meant.
- */
-static void mppe_rekey(struct ppp_mppe_state * state, int initial_key)
-{
- struct scatterlist sg_in[1], sg_out[1];
- struct blkcipher_desc desc = { .tfm = state->arc4 };
-
- get_new_key_from_sha(state);
- if (!initial_key) {
- crypto_blkcipher_setkey(state->arc4, state->sha1_digest,
- state->keylen);
- sg_init_table(sg_in, 1);
- sg_init_table(sg_out, 1);
- setup_sg(sg_in, state->sha1_digest, state->keylen);
- setup_sg(sg_out, state->session_key, state->keylen);
- if (crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
- state->keylen) != 0) {
- printk(KERN_WARNING "mppe_rekey: cipher_encrypt failed\n");
- }
- } else {
- memcpy(state->session_key, state->sha1_digest, state->keylen);
- }
- if (state->keylen == 8) {
- /* See RFC 3078 */
- state->session_key[0] = 0xd1;
- state->session_key[1] = 0x26;
- state->session_key[2] = 0x9e;
- }
- crypto_blkcipher_setkey(state->arc4, state->session_key, state->keylen);
-}
-
-/*
- * Allocate space for a (de)compressor.
- */
-static void *mppe_alloc(unsigned char *options, int optlen)
-{
- struct ppp_mppe_state *state;
- unsigned int digestsize;
-
- if (optlen != CILEN_MPPE + sizeof(state->master_key) ||
- options[0] != CI_MPPE || options[1] != CILEN_MPPE)
- goto out;
-
- state = kzalloc(sizeof(*state), GFP_KERNEL);
- if (state == NULL)
- goto out;
-
-
- state->arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(state->arc4)) {
- state->arc4 = NULL;
- goto out_free;
- }
-
- state->sha1 = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
- if (IS_ERR(state->sha1)) {
- state->sha1 = NULL;
- goto out_free;
- }
-
- digestsize = crypto_hash_digestsize(state->sha1);
- if (digestsize < MPPE_MAX_KEY_LEN)
- goto out_free;
-
- state->sha1_digest = kmalloc(digestsize, GFP_KERNEL);
- if (!state->sha1_digest)
- goto out_free;
-
- /* Save keys. */
- memcpy(state->master_key, &options[CILEN_MPPE],
- sizeof(state->master_key));
- memcpy(state->session_key, state->master_key,
- sizeof(state->master_key));
-
- /*
- * We defer initial key generation until mppe_init(), as mppe_alloc()
- * is called frequently during negotiation.
- */
-
- return (void *)state;
-
- out_free:
- if (state->sha1_digest)
- kfree(state->sha1_digest);
- if (state->sha1)
- crypto_free_hash(state->sha1);
- if (state->arc4)
- crypto_free_blkcipher(state->arc4);
- kfree(state);
- out:
- return NULL;
-}
-
-/*
- * Deallocate space for a (de)compressor.
- */
-static void mppe_free(void *arg)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
- if (state) {
- if (state->sha1_digest)
- kfree(state->sha1_digest);
- if (state->sha1)
- crypto_free_hash(state->sha1);
- if (state->arc4)
- crypto_free_blkcipher(state->arc4);
- kfree(state);
- }
-}
-
-/*
- * Initialize (de)compressor state.
- */
-static int
-mppe_init(void *arg, unsigned char *options, int optlen, int unit, int debug,
- const char *debugstr)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
- unsigned char mppe_opts;
-
- if (optlen != CILEN_MPPE ||
- options[0] != CI_MPPE || options[1] != CILEN_MPPE)
- return 0;
-
- MPPE_CI_TO_OPTS(&options[2], mppe_opts);
- if (mppe_opts & MPPE_OPT_128)
- state->keylen = 16;
- else if (mppe_opts & MPPE_OPT_40)
- state->keylen = 8;
- else {
- printk(KERN_WARNING "%s[%d]: unknown key length\n", debugstr,
- unit);
- return 0;
- }
- if (mppe_opts & MPPE_OPT_STATEFUL)
- state->stateful = 1;
-
- /* Generate the initial session key. */
- mppe_rekey(state, 1);
-
- if (debug) {
- int i;
- char mkey[sizeof(state->master_key) * 2 + 1];
- char skey[sizeof(state->session_key) * 2 + 1];
-
- printk(KERN_DEBUG "%s[%d]: initialized with %d-bit %s mode\n",
- debugstr, unit, (state->keylen == 16) ? 128 : 40,
- (state->stateful) ? "stateful" : "stateless");
-
- for (i = 0; i < sizeof(state->master_key); i++)
- sprintf(mkey + i * 2, "%02x", state->master_key[i]);
- for (i = 0; i < sizeof(state->session_key); i++)
- sprintf(skey + i * 2, "%02x", state->session_key[i]);
- printk(KERN_DEBUG
- "%s[%d]: keys: master: %s initial session: %s\n",
- debugstr, unit, mkey, skey);
- }
-
- /*
- * Initialize the coherency count. The initial value is not specified
- * in RFC 3078, but we can make a reasonable assumption that it will
- * start at 0. Setting it to the max here makes the comp/decomp code
- * do the right thing (determined through experiment).
- */
- state->ccount = MPPE_CCOUNT_SPACE - 1;
-
- /*
- * Note that even though we have initialized the key table, we don't
- * set the FLUSHED bit. This is contrary to RFC 3078, sec. 3.1.
- */
- state->bits = MPPE_BIT_ENCRYPTED;
-
- state->unit = unit;
- state->debug = debug;
-
- return 1;
-}
-
-static int
-mppe_comp_init(void *arg, unsigned char *options, int optlen, int unit,
- int hdrlen, int debug)
-{
- /* ARGSUSED */
- return mppe_init(arg, options, optlen, unit, debug, "mppe_comp_init");
-}
-
-/*
- * We received a CCP Reset-Request (actually, we are sending a Reset-Ack),
- * tell the compressor to rekey. Note that we MUST NOT rekey for
- * every CCP Reset-Request; we only rekey on the next xmit packet.
- * We might get multiple CCP Reset-Requests if our CCP Reset-Ack is lost.
- * So, rekeying for every CCP Reset-Request is broken as the peer will not
- * know how many times we've rekeyed. (If we rekey and THEN get another
- * CCP Reset-Request, we must rekey again.)
- */
-static void mppe_comp_reset(void *arg)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
-
- state->bits |= MPPE_BIT_FLUSHED;
-}
-
-/*
- * Compress (encrypt) a packet.
- * It's strange to call this a compressor, since the output is always
- * MPPE_OVHD + 2 bytes larger than the input.
- */
-static int
-mppe_compress(void *arg, unsigned char *ibuf, unsigned char *obuf,
- int isize, int osize)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
- struct blkcipher_desc desc = { .tfm = state->arc4 };
- int proto;
- struct scatterlist sg_in[1], sg_out[1];
-
- /*
- * Check that the protocol is in the range we handle.
- */
- proto = PPP_PROTOCOL(ibuf);
- if (proto < 0x0021 || proto > 0x00fa)
- return 0;
-
- /* Make sure we have enough room to generate an encrypted packet. */
- if (osize < isize + MPPE_OVHD + 2) {
- /* Drop the packet if we should encrypt it, but can't. */
- printk(KERN_DEBUG "mppe_compress[%d]: osize too small! "
- "(have: %d need: %d)\n", state->unit,
- osize, osize + MPPE_OVHD + 2);
- return -1;
- }
-
- osize = isize + MPPE_OVHD + 2;
-
- /*
- * Copy over the PPP header and set control bits.
- */
- obuf[0] = PPP_ADDRESS(ibuf);
- obuf[1] = PPP_CONTROL(ibuf);
- put_unaligned_be16(PPP_COMP, obuf + 2);
- obuf += PPP_HDRLEN;
-
- state->ccount = (state->ccount + 1) % MPPE_CCOUNT_SPACE;
- if (state->debug >= 7)
- printk(KERN_DEBUG "mppe_compress[%d]: ccount %d\n", state->unit,
- state->ccount);
- put_unaligned_be16(state->ccount, obuf);
-
- if (!state->stateful || /* stateless mode */
- ((state->ccount & 0xff) == 0xff) || /* "flag" packet */
- (state->bits & MPPE_BIT_FLUSHED)) { /* CCP Reset-Request */
- /* We must rekey */
- if (state->debug && state->stateful)
- printk(KERN_DEBUG "mppe_compress[%d]: rekeying\n",
- state->unit);
- mppe_rekey(state, 0);
- state->bits |= MPPE_BIT_FLUSHED;
- }
- obuf[0] |= state->bits;
- state->bits &= ~MPPE_BIT_FLUSHED; /* reset for next xmit */
-
- obuf += MPPE_OVHD;
- ibuf += 2; /* skip to proto field */
- isize -= 2;
-
- /* Encrypt packet */
- sg_init_table(sg_in, 1);
- sg_init_table(sg_out, 1);
- setup_sg(sg_in, ibuf, isize);
- setup_sg(sg_out, obuf, osize);
- if (crypto_blkcipher_encrypt(&desc, sg_out, sg_in, isize) != 0) {
- printk(KERN_DEBUG "crypto_cypher_encrypt failed\n");
- return -1;
- }
-
- state->stats.unc_bytes += isize;
- state->stats.unc_packets++;
- state->stats.comp_bytes += osize;
- state->stats.comp_packets++;
-
- return osize;
-}
-
-/*
- * Since every frame grows by MPPE_OVHD + 2 bytes, this is always going
- * to look bad ... and the longer the link is up the worse it will get.
- */
-static void mppe_comp_stats(void *arg, struct compstat *stats)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
-
- *stats = state->stats;
-}
-
-static int
-mppe_decomp_init(void *arg, unsigned char *options, int optlen, int unit,
- int hdrlen, int mru, int debug)
-{
- /* ARGSUSED */
- return mppe_init(arg, options, optlen, unit, debug, "mppe_decomp_init");
-}
-
-/*
- * We received a CCP Reset-Ack. Just ignore it.
- */
-static void mppe_decomp_reset(void *arg)
-{
- /* ARGSUSED */
- return;
-}
-
-/*
- * Decompress (decrypt) an MPPE packet.
- */
-static int
-mppe_decompress(void *arg, unsigned char *ibuf, int isize, unsigned char *obuf,
- int osize)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
- struct blkcipher_desc desc = { .tfm = state->arc4 };
- unsigned ccount;
- int flushed = MPPE_BITS(ibuf) & MPPE_BIT_FLUSHED;
- int sanity = 0;
- struct scatterlist sg_in[1], sg_out[1];
-
- if (isize <= PPP_HDRLEN + MPPE_OVHD) {
- if (state->debug)
- printk(KERN_DEBUG
- "mppe_decompress[%d]: short pkt (%d)\n",
- state->unit, isize);
- return DECOMP_ERROR;
- }
-
- /*
- * Make sure we have enough room to decrypt the packet.
- * Note that for our test we only subtract 1 byte whereas in
- * mppe_compress() we added 2 bytes (+MPPE_OVHD);
- * this is to account for possible PFC.
- */
- if (osize < isize - MPPE_OVHD - 1) {
- printk(KERN_DEBUG "mppe_decompress[%d]: osize too small! "
- "(have: %d need: %d)\n", state->unit,
- osize, isize - MPPE_OVHD - 1);
- return DECOMP_ERROR;
- }
- osize = isize - MPPE_OVHD - 2; /* assume no PFC */
-
- ccount = MPPE_CCOUNT(ibuf);
- if (state->debug >= 7)
- printk(KERN_DEBUG "mppe_decompress[%d]: ccount %d\n",
- state->unit, ccount);
-
- /* sanity checks -- terminate with extreme prejudice */
- if (!(MPPE_BITS(ibuf) & MPPE_BIT_ENCRYPTED)) {
- printk(KERN_DEBUG
- "mppe_decompress[%d]: ENCRYPTED bit not set!\n",
- state->unit);
- state->sanity_errors += 100;
- sanity = 1;
- }
- if (!state->stateful && !flushed) {
- printk(KERN_DEBUG "mppe_decompress[%d]: FLUSHED bit not set in "
- "stateless mode!\n", state->unit);
- state->sanity_errors += 100;
- sanity = 1;
- }
- if (state->stateful && ((ccount & 0xff) == 0xff) && !flushed) {
- printk(KERN_DEBUG "mppe_decompress[%d]: FLUSHED bit not set on "
- "flag packet!\n", state->unit);
- state->sanity_errors += 100;
- sanity = 1;
- }
-
- if (sanity) {
- if (state->sanity_errors < SANITY_MAX)
- return DECOMP_ERROR;
- else
- /*
- * Take LCP down if the peer is sending too many bogons.
- * We don't want to do this for a single or just a few
- * instances since it could just be due to packet corruption.
- */
- return DECOMP_FATALERROR;
- }
-
- /*
- * Check the coherency count.
- */
-
- if (!state->stateful) {
- /* RFC 3078, sec 8.1. Rekey for every packet. */
- while (state->ccount != ccount) {
- mppe_rekey(state, 0);
- state->ccount = (state->ccount + 1) % MPPE_CCOUNT_SPACE;
- }
- } else {
- /* RFC 3078, sec 8.2. */
- if (!state->discard) {
- /* normal state */
- state->ccount = (state->ccount + 1) % MPPE_CCOUNT_SPACE;
- if (ccount != state->ccount) {
- /*
- * (ccount > state->ccount)
- * Packet loss detected, enter the discard state.
- * Signal the peer to rekey (by sending a CCP Reset-Request).
- */
- state->discard = 1;
- return DECOMP_ERROR;
- }
- } else {
- /* discard state */
- if (!flushed) {
- /* ccp.c will be silent (no additional CCP Reset-Requests). */
- return DECOMP_ERROR;
- } else {
- /* Rekey for every missed "flag" packet. */
- while ((ccount & ~0xff) !=
- (state->ccount & ~0xff)) {
- mppe_rekey(state, 0);
- state->ccount =
- (state->ccount +
- 256) % MPPE_CCOUNT_SPACE;
- }
-
- /* reset */
- state->discard = 0;
- state->ccount = ccount;
- /*
- * Another problem with RFC 3078 here. It implies that the
- * peer need not send a Reset-Ack packet. But RFC 1962
- * requires it. Hopefully, M$ does send a Reset-Ack; even
- * though it isn't required for MPPE synchronization, it is
- * required to reset CCP state.
- */
- }
- }
- if (flushed)
- mppe_rekey(state, 0);
- }
-
- /*
- * Fill in the first part of the PPP header. The protocol field
- * comes from the decrypted data.
- */
- obuf[0] = PPP_ADDRESS(ibuf); /* +1 */
- obuf[1] = PPP_CONTROL(ibuf); /* +1 */
- obuf += 2;
- ibuf += PPP_HDRLEN + MPPE_OVHD;
- isize -= PPP_HDRLEN + MPPE_OVHD; /* -6 */
- /* net osize: isize-4 */
-
- /*
- * Decrypt the first byte in order to check if it is
- * a compressed or uncompressed protocol field.
- */
- sg_init_table(sg_in, 1);
- sg_init_table(sg_out, 1);
- setup_sg(sg_in, ibuf, 1);
- setup_sg(sg_out, obuf, 1);
- if (crypto_blkcipher_decrypt(&desc, sg_out, sg_in, 1) != 0) {
- printk(KERN_DEBUG "crypto_cypher_decrypt failed\n");
- return DECOMP_ERROR;
- }
-
- /*
- * Do PFC decompression.
- * This would be nicer if we were given the actual sk_buff
- * instead of a char *.
- */
- if ((obuf[0] & 0x01) != 0) {
- obuf[1] = obuf[0];
- obuf[0] = 0;
- obuf++;
- osize++;
- }
-
- /* And finally, decrypt the rest of the packet. */
- setup_sg(sg_in, ibuf + 1, isize - 1);
- setup_sg(sg_out, obuf + 1, osize - 1);
- if (crypto_blkcipher_decrypt(&desc, sg_out, sg_in, isize - 1)) {
- printk(KERN_DEBUG "crypto_cypher_decrypt failed\n");
- return DECOMP_ERROR;
- }
-
- state->stats.unc_bytes += osize;
- state->stats.unc_packets++;
- state->stats.comp_bytes += isize;
- state->stats.comp_packets++;
-
- /* good packet credit */
- state->sanity_errors >>= 1;
-
- return osize;
-}
-
-/*
- * Incompressible data has arrived (this should never happen!).
- * We should probably drop the link if the protocol is in the range
- * of what should be encrypted. At the least, we should drop this
- * packet. (How to do this?)
- */
-static void mppe_incomp(void *arg, unsigned char *ibuf, int icnt)
-{
- struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
-
- if (state->debug &&
- (PPP_PROTOCOL(ibuf) >= 0x0021 && PPP_PROTOCOL(ibuf) <= 0x00fa))
- printk(KERN_DEBUG
- "mppe_incomp[%d]: incompressible (unencrypted) data! "
- "(proto %04x)\n", state->unit, PPP_PROTOCOL(ibuf));
-
- state->stats.inc_bytes += icnt;
- state->stats.inc_packets++;
- state->stats.unc_bytes += icnt;
- state->stats.unc_packets++;
-}
-
-/*************************************************************
- * Module interface table
- *************************************************************/
-
-/*
- * Procedures exported to if_ppp.c.
- */
-static struct compressor ppp_mppe = {
- .compress_proto = CI_MPPE,
- .comp_alloc = mppe_alloc,
- .comp_free = mppe_free,
- .comp_init = mppe_comp_init,
- .comp_reset = mppe_comp_reset,
- .compress = mppe_compress,
- .comp_stat = mppe_comp_stats,
- .decomp_alloc = mppe_alloc,
- .decomp_free = mppe_free,
- .decomp_init = mppe_decomp_init,
- .decomp_reset = mppe_decomp_reset,
- .decompress = mppe_decompress,
- .incomp = mppe_incomp,
- .decomp_stat = mppe_comp_stats,
- .owner = THIS_MODULE,
- .comp_extra = MPPE_PAD,
-};
-
-/*
- * ppp_mppe_init()
- *
- * Prior to allowing load, try to load the arc4 and sha1 crypto
- * libraries. The actual use will be allocated later, but
- * this way the module will fail to insmod if they aren't available.
- */
-
-static int __init ppp_mppe_init(void)
-{
- int answer;
- if (!(crypto_has_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC) &&
- crypto_has_hash("sha1", 0, CRYPTO_ALG_ASYNC)))
- return -ENODEV;
-
- sha_pad = kmalloc(sizeof(struct sha_pad), GFP_KERNEL);
- if (!sha_pad)
- return -ENOMEM;
- sha_pad_init(sha_pad);
-
- answer = ppp_register_compressor(&ppp_mppe);
-
- if (answer == 0)
- printk(KERN_INFO "PPP MPPE Compression module registered\n");
- else
- kfree(sha_pad);
-
- return answer;
-}
-
-static void __exit ppp_mppe_cleanup(void)
-{
- ppp_unregister_compressor(&ppp_mppe);
- kfree(sha_pad);
-}
-
-module_init(ppp_mppe_init);
-module_exit(ppp_mppe_cleanup);