target/linux: revert r24014 (further testing is needed)

SVN-Revision: 24015

3 files changed, 2 insertions, 1747 deletions

diff --git a/package/kernel/modules/netsupport.mk b/package/kernel/modules/netsupport.mk
index 06adfdd..1baba4b 100644
--- a/package/kernel/modules/netsupport.mk
+++ b/package/kernel/modules/netsupport.mk
@@ -511,8 +511,8 @@ define KernelPackage/mppe
   KCONFIG:= \
 	CONFIG_PPP_MPPE_MPPC \
 	CONFIG_PPP_MPPE
-  FILES:=$(LINUX_DIR)/drivers/net/ppp_mppe*.ko
-  AUTOLOAD:=$(call AutoLoad,31,ppp_mppe ppp_mppe_mppc)
+  FILES:=$(LINUX_DIR)/drivers/net/ppp_mppe.ko
+  AUTOLOAD:=$(call AutoLoad,31,ppp_mppe)
 endef
 
 define KernelPackage/mppe/description
diff --git a/target/linux/generic/config-2.6.37 b/target/linux/generic/config-2.6.37
index 2366e95..c44f0ff 100644
--- a/target/linux/generic/config-2.6.37
+++ b/target/linux/generic/config-2.6.37
@@ -1820,7 +1820,6 @@ CONFIG_PPC_4K_PAGES=y
 # CONFIG_PPP_DEFLATE is not set
 CONFIG_PPP_FILTER=y
 # CONFIG_PPP_MPPE is not set
-# CONFIG_PPP_MPPE_MPPC is not set
 CONFIG_PPP_MULTILINK=y
 # CONFIG_PPP_SYNC_TTY is not set
 # CONFIG_PPS is not set
diff --git a/target/linux/generic/patches-2.6.37/251-mppe_mppc_2_6_36.patch b/target/linux/generic/patches-2.6.37/251-mppe_mppc_2_6_36.patch
deleted file mode 100644
index 6deca35..0000000
--- a/target/linux/generic/patches-2.6.37/251-mppe_mppc_2_6_36.patch
+++ /dev/null
@@ -1,1744 +0,0 @@
---- a/crypto/api.c
-+++ b/crypto/api.c
-@@ -602,5 +602,20 @@ int crypto_has_alg(const char *name, u32
- }
- EXPORT_SYMBOL_GPL(crypto_has_alg);
- 
-+int crypto_alg_available(const char *name, u32 flags)
-+{
-+	int ret = 0;
-+	struct crypto_alg *alg = crypto_alg_mod_lookup(name, 0,
-+						       CRYPTO_ALG_ASYNC);
-+	
-+	if (!IS_ERR(alg)) {
-+		crypto_mod_put(alg);
-+		ret = 1;
-+	}
-+	
-+	return ret;
-+}
-+EXPORT_SYMBOL_GPL(crypto_alg_available);
-+
- MODULE_DESCRIPTION("Cryptographic core API");
- MODULE_LICENSE("GPL");
---- a/drivers/net/Kconfig
-+++ b/drivers/net/Kconfig
-@@ -3349,19 +3349,31 @@ config PPP_BSDCOMP
- 	  module; it is called bsd_comp and will show up in the directory
- 	  modules once you have said "make modules". If unsure, say N.
- 
--config PPP_MPPE
--       tristate "PPP MPPE compression (encryption) (EXPERIMENTAL)"
--       depends on PPP && EXPERIMENTAL
--       select CRYPTO
--       select CRYPTO_SHA1
--       select CRYPTO_ARC4
--       select CRYPTO_ECB
--       ---help---
--         Support for the MPPE Encryption protocol, as employed by the
--	 Microsoft Point-to-Point Tunneling Protocol.
-+config PPP_MPPE_MPPC
-+	tristate "Microsoft PPP compression/encryption (MPPC/MPPE)"
-+	depends on PPP
-+	select CRYPTO_SHA1
-+	select CRYPTO_ARC4
-+	---help---
-+	  Support for the Microsoft Point-To-Point Compression (RFC2118) and 
-+	  Microsoft Point-To-Point Encryption (RFC3078). These protocols are
-+	  supported by Microsoft Windows and wide range of "hardware" access
-+	  servers. MPPE is common protocol in Virtual Private Networks. According
-+	  to RFC3078, MPPE supports 40, 56 and 128-bit key lengths. Depending on
-+	  PPP daemon configuration on both ends of the link, following scenarios
-+	  are possible:
-+		- only compression (MPPC) is used,
-+		- only encryption (MPPE) is used,
-+		- compression and encryption (MPPC+MPPE) are used.
- 
--	 See http://pptpclient.sourceforge.net/ for information on
--	 configuring PPTP clients and servers to utilize this method.
-+	  Please note that Hi/Fn (http://www.hifn.com) holds patent on MPPC so
-+	  you should check if this patent is valid in your country in order to
-+	  avoid legal problems.
-+
-+	  For more information please visit http://mppe-mppc.alphacron.de
-+
-+	  To compile this driver as a module, choose M here. The module will
-+	  be called ppp_mppe_mppc.ko.
- 
- config PPPOE
- 	tristate "PPP over Ethernet (EXPERIMENTAL)"
---- a/drivers/net/Makefile
-+++ b/drivers/net/Makefile
-@@ -162,7 +162,7 @@ obj-$(CONFIG_PPP_ASYNC) += ppp_async.o
- obj-$(CONFIG_PPP_SYNC_TTY) += ppp_synctty.o
- obj-$(CONFIG_PPP_DEFLATE) += ppp_deflate.o
- obj-$(CONFIG_PPP_BSDCOMP) += bsd_comp.o
--obj-$(CONFIG_PPP_MPPE) += ppp_mppe.o
-+obj-$(CONFIG_PPP_MPPE_MPPC) += ppp_mppe_mppc.o
- obj-$(CONFIG_PPPOE) += pppox.o pppoe.o
- obj-$(CONFIG_PPPOL2TP) += pppox.o
- obj-$(CONFIG_PPTP) += pppox.o pptp.o
---- a/drivers/net/ppp_generic.c
-+++ b/drivers/net/ppp_generic.c
-@@ -41,6 +41,7 @@
- #include <linux/ip.h>
- #include <linux/tcp.h>
- #include <linux/spinlock.h>
-+#include <linux/smp_lock.h>
- #include <linux/rwsem.h>
- #include <linux/stddef.h>
- #include <linux/device.h>
-@@ -87,10 +88,11 @@ struct ppp_file {
- 	int		dead;		/* unit/channel has been shut down */
- };
- 
--#define PF_TO_X(pf, X)		container_of(pf, X, file)
-+#define PF_TO_X(pf, X)		((X *)((char *)(pf) - offsetof(X, file)))
- 
- #define PF_TO_PPP(pf)		PF_TO_X(pf, struct ppp)
- #define PF_TO_CHANNEL(pf)	PF_TO_X(pf, struct channel)
-+#define ROUNDUP(n, x)		(((n) + (x) - 1) / (x))
- 
- /*
-  * Data structure describing one ppp unit.
-@@ -106,6 +108,7 @@ struct ppp {
- 	spinlock_t	rlock;		/* lock for receive side 58 */
- 	spinlock_t	wlock;		/* lock for transmit side 5c */
- 	int		mru;		/* max receive unit 60 */
-+	int		mru_alloc;	/* MAX(1500,MRU) for dev_alloc_skb() */
- 	unsigned int	flags;		/* control bits 64 */
- 	unsigned int	xstate;		/* transmit state bits 68 */
- 	unsigned int	rstate;		/* receive state bits 6c */
-@@ -139,14 +142,13 @@ struct ppp {
- 
- /*
-  * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC,
-- * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP,
-- * SC_MUST_COMP
-+ * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP.
-  * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR.
-  * Bits in xstate: SC_COMP_RUN
-  */
- #define SC_FLAG_BITS	(SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \
- 			 |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \
--			 |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP)
-+		     |SC_COMP_TCP|SC_REJ_COMP_TCP)
- 
- /*
-  * Private data structure for each channel.
-@@ -639,7 +641,9 @@ static long ppp_ioctl(struct file *file,
- 	case PPPIOCSMRU:
- 		if (get_user(val, p))
- 			break;
--		ppp->mru = val;
-+		ppp->mru_alloc = ppp->mru = val;
-+	if (ppp->mru_alloc < PPP_MRU)
-+	    ppp->mru_alloc = PPP_MRU;	/* increase for broken peers */
- 		err = 0;
- 		break;
- 
-@@ -1066,56 +1070,6 @@ ppp_xmit_process(struct ppp *ppp)
- 	ppp_xmit_unlock(ppp);
- }
- 
--static inline struct sk_buff *
--pad_compress_skb(struct ppp *ppp, struct sk_buff *skb)
--{
--	struct sk_buff *new_skb;
--	int len;
--	int new_skb_size = ppp->dev->mtu +
--		ppp->xcomp->comp_extra + ppp->dev->hard_header_len;
--	int compressor_skb_size = ppp->dev->mtu +
--		ppp->xcomp->comp_extra + PPP_HDRLEN;
--	new_skb = alloc_skb(new_skb_size, GFP_ATOMIC);
--	if (!new_skb) {
--		if (net_ratelimit())
--			printk(KERN_ERR "PPP: no memory (comp pkt)\n");
--		return NULL;
--	}
--	if (ppp->dev->hard_header_len > PPP_HDRLEN)
--		skb_reserve(new_skb,
--			    ppp->dev->hard_header_len - PPP_HDRLEN);
--
--	/* compressor still expects A/C bytes in hdr */
--	len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
--				   new_skb->data, skb->len + 2,
--				   compressor_skb_size);
--	if (len > 0 && (ppp->flags & SC_CCP_UP)) {
--		kfree_skb(skb);
--		skb = new_skb;
--		skb_put(skb, len);
--		skb_pull(skb, 2);	/* pull off A/C bytes */
--	} else if (len == 0) {
--		/* didn't compress, or CCP not up yet */
--		kfree_skb(new_skb);
--		new_skb = skb;
--	} else {
--		/*
--		 * (len < 0)
--		 * MPPE requires that we do not send unencrypted
--		 * frames.  The compressor will return -1 if we
--		 * should drop the frame.  We cannot simply test
--		 * the compress_proto because MPPE and MPPC share
--		 * the same number.
--		 */
--		if (net_ratelimit())
--			printk(KERN_ERR "ppp: compressor dropped pkt\n");
--		kfree_skb(skb);
--		kfree_skb(new_skb);
--		new_skb = NULL;
--	}
--	return new_skb;
--}
--
- /*
-  * Compress and send a frame.
-  * The caller should have locked the xmit path,
-@@ -1196,20 +1150,62 @@ ppp_send_frame(struct ppp *ppp, struct s
- 	case PPP_CCP:
- 		/* peek at outbound CCP frames */
- 		ppp_ccp_peek(ppp, skb, 0);
-+		if (CCP_CODE(skb->data+2) == CCP_RESETACK
-+			&& (ppp->xcomp->compress_proto == CI_MPPE
-+				|| ppp->xcomp->compress_proto == CI_LZS)) {
-+			--ppp->dev->stats.tx_packets;
-+			ppp->dev->stats.tx_bytes -= skb->len - 2;
-+			kfree_skb(skb);
-+			return;
-+		}
- 		break;
- 	}
- 
- 	/* try to do packet compression */
- 	if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state &&
- 	    proto != PPP_LCP && proto != PPP_CCP) {
--		if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) {
--			if (net_ratelimit())
--				printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n");
-+	    	int comp_ovhd = 0;
-+		/* 
-+		 * because of possible data expansion when MPPC or LZS
-+		 * is used, allocate compressor's buffer 12.5% bigger
-+		 * than MTU
-+		 */
-+		if (ppp->xcomp->compress_proto == CI_MPPE)
-+			comp_ovhd = ((ppp->dev->mtu * 9) / 8) + 1 + MPPE_OVHD;
-+		else if (ppp->xcomp->compress_proto == CI_LZS)
-+			comp_ovhd = ((ppp->dev->mtu * 9) / 8) + 1 + LZS_OVHD;
-+		new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len
-+				+ comp_ovhd, GFP_ATOMIC);
-+		if (new_skb == 0) {
-+			 printk(KERN_ERR "PPP: no memory (comp pkt)\n");
- 			goto drop;
- 		}
--		skb = pad_compress_skb(ppp, skb);
--		if (!skb)
-+		if (ppp->dev->hard_header_len > PPP_HDRLEN)
-+			skb_reserve(new_skb,
-+				ppp->dev->hard_header_len - PPP_HDRLEN);
-+
-+		/* compressor still expects A/C bytes in hdr */
-+		len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
-+					new_skb->data, skb->len + 2,
-+					ppp->dev->mtu + PPP_HDRLEN);
-+		if (len > 0 && (ppp->flags & SC_CCP_UP)) {
-+			kfree_skb(skb);
-+			skb = new_skb;
-+			skb_put(skb, len);
-+			skb_pull(skb, 2);       /* pull off A/C bytes */
-+		} else if (len == 0) {
-+			/*
-+			 * (len < 0)
-+			 * MPPE requires that we do not send unencrypted
-+			 * frames.  The compressor will return -1 if we
-+			 * should drop the frame.  We cannot simply test
-+			 * the compress_proto because MPPE and MPPC share
-+			 * the same number.
-+			 */
-+			printk(KERN_ERR "ppp: compressor dropped pkt\n");
-+			kfree_skb(new_skb);
- 			goto drop;
-+		}
- 	}
- 
- 	/*
-@@ -1670,9 +1666,6 @@ ppp_receive_nonmp_frame(struct ppp *ppp,
- 	    (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0)
- 		skb = ppp_decompress_frame(ppp, skb);
- 
--	if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR)
--		goto err;
--
- 	proto = PPP_PROTO(skb);
- 	switch (proto) {
- 	case PPP_VJC_COMP:
-@@ -1852,7 +1845,14 @@ ppp_decompress_frame(struct ppp *ppp, st
- 	return skb;
- 
-  err:
--	ppp->rstate |= SC_DC_ERROR;
-+	if (ppp->rcomp->compress_proto != CI_MPPE
-+	    && ppp->rcomp->compress_proto != CI_LZS) {
-+	    /*
-+	     * If decompression protocol isn't MPPE/MPPC or LZS, we set
-+	     * SC_DC_ERROR flag and wait for CCP_RESETACK
-+	     */
-+	    ppp->rstate |= SC_DC_ERROR;
-+	}
- 	ppp_receive_error(ppp);
- 	return skb;
- }
-@@ -2566,6 +2566,7 @@ ppp_create_interface(struct net *net, in
- 	ppp = netdev_priv(dev);
- 	ppp->dev = dev;
- 	ppp->mru = PPP_MRU;
-+	ppp->mru_alloc = PPP_MRU;
- 	init_ppp_file(&ppp->file, INTERFACE);
- 	ppp->file.hdrlen = PPP_HDRLEN - 2;	/* don't count proto bytes */
- 	for (i = 0; i < NUM_NP; ++i)
---- /dev/null
-+++ b/drivers/net/ppp_mppe_mppc.c
-@@ -0,0 +1,1308 @@
-+/*
-+ * ppp_mppe_mppc.c - MPPC/MPPE "compressor/decompressor" module.
-+ *
-+ * Copyright (c) 1994 Árpád Magosányi <mag@bunuel.tii.matav.hu>
-+ * Copyright (c) 1999 Tim Hockin, Cobalt Networks Inc. <thockin@cobaltnet.com>
-+ * Copyright (c) 2002-2004 Jan Dubiec <jdx@slackware.pl>
-+ * 
-+ * 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 code is based on MPPE kernel module written by Árpád Magosányi and
-+ * Tim Hockin which can be found on http://planetmirror.com/pub/mppe/.
-+ * I have added MPPC and 56 bit session keys support in MPPE.
-+ *
-+ * WARNING! Although this is open source code, its usage in some countries
-+ * (in particular in the USA) may violate Stac Inc. patent for MPPC.
-+ *
-+ *  ==FILEVERSION 20041123==
-+ *
-+ */
-+
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/mm.h>
-+#include <linux/slab.h>
-+#include <asm/scatterlist.h>
-+#include <linux/vmalloc.h>
-+#include <linux/crypto.h>
-+
-+#include <linux/ppp_defs.h>
-+#include <linux/ppp-comp.h>
-+
-+/*
-+ * State for a mppc/mppe "(de)compressor".
-+ */
-+struct ppp_mppe_state {
-+    struct crypto_tfm *arc4_tfm;
-+    struct crypto_hash *sha1_tfm;
-+    u8		*sha1_digest;
-+    u8		master_key[MPPE_MAX_KEY_LEN];
-+    u8		session_key[MPPE_MAX_KEY_LEN];
-+    u8		mppc;		/* do we use compression (MPPC)? */
-+    u8		mppe;		/* do we use encryption (MPPE)? */
-+    u8		keylen;		/* key length in bytes */
-+    u8		bitkeylen;	/* key length in bits */
-+    u16		ccount;		/* coherency counter */
-+    u16		bits;		/* MPPC/MPPE control bits */
-+    u8		stateless;	/* do we use stateless mode? */
-+    u8		nextflushed;	/* set A bit in the next outgoing packet;
-+				   used only by compressor*/
-+    u8		flushexpected;	/* drop packets until A bit is received;
-+				   used only by decompressor*/
-+    u8		*hist;		/* MPPC history */
-+    u16		*hash;		/* Hash table; used only by compressor */
-+    u16		histptr;	/* history "cursor" */
-+    int		unit;
-+    int		debug;
-+    int		mru;
-+    struct compstat stats;
-+};
-+
-+#define MPPE_HIST_LEN		8192	/* MPPC history size */
-+#define MPPE_MAX_CCOUNT		0x0FFF	/* max. coherency counter value */
-+
-+#define MPPE_BIT_FLUSHED	0x80	/* bit A */
-+#define MPPE_BIT_RESET		0x40	/* bit B */
-+#define MPPE_BIT_COMP		0x20	/* bit C */
-+#define MPPE_BIT_ENCRYPTED	0x10	/* bit D */
-+
-+#define MPPE_SALT0		0xD1	/* values used in MPPE key derivation */
-+#define MPPE_SALT1		0x26	/* according to RFC3079 */
-+#define MPPE_SALT2		0x9E
-+
-+#define MPPE_CCOUNT(x)		((((x)[4] & 0x0f) << 8) + (x)[5])
-+#define MPPE_BITS(x)		((x)[4] & 0xf0)
-+#define MPPE_CTRLHI(x)		((((x)->ccount & 0xf00)>>8)|((x)->bits))
-+#define MPPE_CTRLLO(x)		((x)->ccount & 0xff)
-+
-+/*
-+ * 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. It is done
-+ * in mppe_module_init(). This has been pointed out on 30th July 2004 by Oleg
-+ * Makarenko on pptpclient-devel mailing list.
-+ */
-+#define SHA1_PAD_SIZE		40
-+struct sha_pad {
-+    unsigned char sha_pad1[SHA1_PAD_SIZE];
-+    unsigned char sha_pad2[SHA1_PAD_SIZE];
-+};
-+static struct sha_pad *sha_pad;
-+
-+static unsigned int
-+setup_sg(struct scatterlist *sg, const void  *address, unsigned int length)
-+{
-+    sg[0].page_link = virt_to_page(address);
-+    sg[0].offset = offset_in_page(address);
-+    sg[0].length = length;
-+    return length;
-+}
-+
-+static inline void
-+arc4_setkey(struct ppp_mppe_state *state, const unsigned char *key,
-+	    const unsigned int keylen)
-+{
-+    crypto_cipher_setkey(state->arc4_tfm, key, keylen);
-+}
-+
-+static inline void
-+arc4_encrypt(struct ppp_mppe_state *state, const unsigned char *in,
-+	     const unsigned int len, unsigned char *out)
-+{
-+    int i;
-+    for (i = 0; i < len; i++)
-+    {
-+       crypto_cipher_encrypt_one(state->arc4_tfm, out+i, in+i);
-+    }
-+}
-+
-+
-+#define arc4_decrypt arc4_encrypt
-+
-+/*
-+ * 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, unsigned char *interim_key)
-+{
-+	struct hash_desc desc;
-+	struct scatterlist sg[4];
-+	unsigned int nbytes;
-+
-+
-+	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_tfm;
-+	desc.flags = 0;
-+
-+	crypto_hash_digest(&desc, sg, nbytes, state->sha1_digest);
-+    memcpy(interim_key, state->sha1_digest, state->keylen);
-+}
-+
-+static void
-+mppe_change_key(struct ppp_mppe_state *state, int initialize)
-+{
-+    unsigned char interim_key[MPPE_MAX_KEY_LEN];
-+
-+    get_new_key_from_sha(state, interim_key);
-+    if (initialize) {
-+	memcpy(state->session_key, interim_key, state->keylen);
-+    } else {
-+	arc4_setkey(state, interim_key, state->keylen);
-+	arc4_encrypt(state, interim_key, state->keylen, state->session_key);
-+    }
-+    if (state->keylen == 8) {
-+	if (state->bitkeylen == 40) {
-+	    state->session_key[0] = MPPE_SALT0;
-+	    state->session_key[1] = MPPE_SALT1;
-+	    state->session_key[2] = MPPE_SALT2;
-+	} else {
-+	    state->session_key[0] = MPPE_SALT0;
-+	}
-+    }
-+    arc4_setkey(state, state->session_key, state->keylen);
-+}
-+
-+/* increase 12-bit coherency counter */
-+static inline void
-+mppe_increase_ccount(struct ppp_mppe_state *state)
-+{
-+    state->ccount = (state->ccount + 1) & MPPE_MAX_CCOUNT;
-+    if (state->mppe) {
-+	if (state->stateless) {
-+	    mppe_change_key(state, 0);
-+	    state->nextflushed = 1;
-+	} else {
-+	    if ((state->ccount & 0xff) == 0xff) {
-+		mppe_change_key(state, 0);
-+	    }
-+	}
-+    }
-+}
-+
-+/* allocate space for a MPPE/MPPC (de)compressor.  */
-+/*   comp != 0 -> init compressor */
-+/*   comp = 0 -> init decompressor */
-+static void *
-+mppe_alloc(unsigned char *options, int opt_len, int comp)
-+{
-+    struct ppp_mppe_state *state;
-+    unsigned int digestsize;
-+    u8* fname;
-+
-+    fname = comp ? "mppe_comp_alloc" : "mppe_decomp_alloc";
-+
-+    /*  
-+     * Hack warning - additionally to the standard MPPC/MPPE configuration
-+     * options, pppd passes to the (de)copressor 8 or 16 byte session key.
-+     * Therefore options[1] contains MPPC/MPPE configuration option length
-+     * (CILEN_MPPE = 6), but the real options length, depending on the key
-+     * length, is 6+8 or 6+16.
-+     */
-+    if (opt_len < CILEN_MPPE) {
-+	printk(KERN_WARNING "%s: wrong options length: %u\n", fname, opt_len);
-+	return NULL;
-+    }
-+
-+    if (options[0] != CI_MPPE || options[1] != CILEN_MPPE ||
-+	(options[2] & ~MPPE_STATELESS) != 0 ||
-+	options[3] != 0 || options[4] != 0 ||
-+	(options[5] & ~(MPPE_128BIT|MPPE_56BIT|MPPE_40BIT|MPPE_MPPC)) != 0 ||
-+	(options[5] & (MPPE_128BIT|MPPE_56BIT|MPPE_40BIT|MPPE_MPPC)) == 0) {
-+	printk(KERN_WARNING "%s: options rejected: o[0]=%02x, o[1]=%02x, "
-+	       "o[2]=%02x, o[3]=%02x, o[4]=%02x, o[5]=%02x\n", fname, options[0],
-+	       options[1], options[2], options[3], options[4], options[5]);
-+	return NULL;
-+    }
-+
-+    state = (struct ppp_mppe_state *)kmalloc(sizeof(*state), GFP_KERNEL);
-+    if (state == NULL) {
-+	printk(KERN_ERR "%s: cannot allocate space for %scompressor\n", fname,
-+	       comp ? "" : "de");
-+	return NULL;
-+    }
-+    memset(state, 0, sizeof(struct ppp_mppe_state));
-+
-+    state->mppc = options[5] & MPPE_MPPC;	/* Do we use MPPC? */
-+    state->mppe = options[5] & (MPPE_128BIT | MPPE_56BIT |
-+	MPPE_40BIT);				/* Do we use MPPE? */
-+
-+    if (state->mppc) {
-+	/* allocate MPPC history */
-+	state->hist = (u8*)vmalloc(2*MPPE_HIST_LEN*sizeof(u8));
-+	if (state->hist == NULL) {
-+	    kfree(state);
-+	    printk(KERN_ERR "%s: cannot allocate space for MPPC history\n",
-+		   fname);
-+	    return NULL;
-+	}
-+
-+	/* allocate hashtable for MPPC compressor */
-+	if (comp) {
-+	    state->hash = (u16*)vmalloc(MPPE_HIST_LEN*sizeof(u16));
-+	    if (state->hash == NULL) {
-+		vfree(state->hist);
-+		kfree(state);
-+		printk(KERN_ERR "%s: cannot allocate space for MPPC history\n",
-+		       fname);
-+		return NULL;
-+	    }
-+	}
-+    }
-+
-+    if (state->mppe) { /* specific for MPPE */
-+	/* Load ARC4 algorithm */
-+	state->arc4_tfm = crypto_alloc_base("arc4", 0, 0);
-+	if (state->arc4_tfm == NULL) {
-+	    if (state->mppc) {
-+		vfree(state->hash);
-+		if (comp)
-+		    vfree(state->hist);
-+	    }
-+	    kfree(state);
-+	    printk(KERN_ERR "%s: cannot load ARC4 module\n", fname);
-+	    return NULL;
-+	}
-+
-+	/* Load SHA1 algorithm */
-+	state->sha1_tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
-+	if (state->sha1_tfm == NULL) {
-+	    crypto_free_tfm(state->arc4_tfm);
-+	    if (state->mppc) {
-+		vfree(state->hash);
-+		if (comp)
-+		    vfree(state->hist);
-+	    }
-+	    kfree(state);
-+	    printk(KERN_ERR "%s: cannot load SHA1 module\n", fname);
-+	    return NULL;
-+	}
-+
-+	digestsize = crypto_hash_digestsize(state->sha1_tfm);
-+	if (digestsize < MPPE_MAX_KEY_LEN) {
-+	    crypto_free_hash(state->sha1_tfm);
-+	    crypto_free_tfm(state->arc4_tfm);
-+	    if (state->mppc) {
-+		vfree(state->hash);
-+		if (comp)
-+		    vfree(state->hist);
-+	    }
-+	    kfree(state);
-+	    printk(KERN_ERR "%s: CryptoAPI SHA1 digest size too small\n", fname);
-+	}
-+
-+	state->sha1_digest = kmalloc(digestsize, GFP_KERNEL);
-+	if (!state->sha1_digest) {
-+	    crypto_free_hash(state->sha1_tfm);
-+	    crypto_free_tfm(state->arc4_tfm);
-+	    if (state->mppc) {
-+		vfree(state->hash);
-+		if (comp)
-+		    vfree(state->hist);
-+	    }
-+	    kfree(state);
-+	    printk(KERN_ERR "%s: cannot allocate space for SHA1 digest\n", fname);
-+	}
-+
-+	memcpy(state->master_key, options+CILEN_MPPE, MPPE_MAX_KEY_LEN);
-+	memcpy(state->session_key, state->master_key, MPPE_MAX_KEY_LEN);
-+	/* initial key generation is done in mppe_init() */
-+    }
-+
-+    return (void *) state;
-+}
-+
-+static void *
-+mppe_comp_alloc(unsigned char *options, int opt_len)
-+{
-+    return mppe_alloc(options, opt_len, 1);
-+}
-+
-+static void *
-+mppe_decomp_alloc(unsigned char *options, int opt_len)
-+{
-+    return mppe_alloc(options, opt_len, 0);
-+}
-+
-+/* cleanup the (de)compressor */
-+static void
-+mppe_comp_free(void *arg)
-+{
-+    struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
-+
-+    if (state != NULL) {
-+	if (state->mppe) {
-+	    if (state->sha1_digest != NULL)
-+		kfree(state->sha1_digest);
-+	    if (state->sha1_tfm != NULL)
-+		crypto_free_hash(state->sha1_tfm);
-+	    if (state->arc4_tfm != NULL)
-+		crypto_free_tfm(state->arc4_tfm);
-+	}
-+	if (state->hist != NULL)
-+	    vfree(state->hist);
-+	if (state->hash != NULL)
-+	    vfree(state->hash);
-+	kfree(state);
-+    }
-+}
-+
-+/* init MPPC/MPPE (de)compresor */
-+/*   comp != 0 -> init compressor */
-+/*   comp = 0 -> init decompressor */
-+static int
-+mppe_init(void *arg, unsigned char *options, int opt_len, int unit,
-+	  int hdrlen, int mru, int debug, int comp)
-+{
-+    struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
-+    u8* fname;
-+
-+    fname = comp ? "mppe_comp_init" : "mppe_decomp_init";
-+
-+    if (opt_len < CILEN_MPPE) {
-+	if (debug)
-+	    printk(KERN_WARNING "%s: wrong options length: %u\n",
-+		   fname, opt_len);
-+	return 0;
-+    }
-+
-+    if (options[0] != CI_MPPE || options[1] != CILEN_MPPE ||
-+	(options[2] & ~MPPE_STATELESS) != 0 ||
-+	options[3] != 0 || options[4] != 0 ||
-+	(options[5] & ~(MPPE_56BIT|MPPE_128BIT|MPPE_40BIT|MPPE_MPPC)) != 0 ||
-+	(options[5] & (MPPE_56BIT|MPPE_128BIT|MPPE_40BIT|MPPE_MPPC)) == 0) {
-+	if (debug)
-+	    printk(KERN_WARNING "%s: options rejected: o[0]=%02x, o[1]=%02x, "
-+		   "o[2]=%02x, o[3]=%02x, o[4]=%02x, o[5]=%02x\n", fname,
-+		   options[0], options[1], options[2], options[3], options[4],
-+		   options[5]);
-+	return 0;
-+    }
-+
-+    if ((options[5] & ~MPPE_MPPC) != MPPE_128BIT &&
-+	(options[5] & ~MPPE_MPPC) != MPPE_56BIT &&
-+	(options[5] & ~MPPE_MPPC) != MPPE_40BIT &&
-+	(options[5] & MPPE_MPPC) != MPPE_MPPC) {
-+	if (debug)
-+	    printk(KERN_WARNING "%s: don't know what to do: o[5]=%02x\n",
-+		   fname, options[5]);
-+	return 0;
-+    }
-+
-+    state->mppc = options[5] & MPPE_MPPC;	/* Do we use MPPC? */
-+    state->mppe = options[5] & (MPPE_128BIT | MPPE_56BIT |
-+	MPPE_40BIT);				/* Do we use MPPE? */
-+    state->stateless = options[2] & MPPE_STATELESS; /* Do we use stateless mode? */
-+
-+    switch (state->mppe) {
-+    case MPPE_40BIT:     /* 40 bit key */
-+	state->keylen = 8;
-+	state->bitkeylen = 40;
-+	break;
-+    case MPPE_56BIT:     /* 56 bit key */
-+	state->keylen = 8;
-+	state->bitkeylen = 56;
-+	break;
-+    case MPPE_128BIT:    /* 128 bit key */
-+	state->keylen = 16;
-+	state->bitkeylen = 128;
-+	break;
-+    default:
-+	state->keylen = 0;
-+	state->bitkeylen = 0;
-+    }
-+
-+    state->ccount = MPPE_MAX_CCOUNT;
-+    state->bits = 0;
-+    state->unit  = unit;
-+    state->debug = debug;
-+    state->histptr = MPPE_HIST_LEN;
-+    if (state->mppc) {	/* reset history if MPPC was negotiated */
-+	memset(state->hist, 0, 2*MPPE_HIST_LEN*sizeof(u8));
-+    }
-+
-+    if (state->mppe) { /* generate initial session keys */
-+	mppe_change_key(state, 1);
-+    }
-+
-+    if (comp) { /* specific for compressor */
-+	state->nextflushed = 1;
-+    } else { /* specific for decompressor */
-+	state->mru = mru;
-+	state->flushexpected = 1;
-+    }
-+
-+    return 1;
-+}
-+
-+static int
-+mppe_comp_init(void *arg, unsigned char *options, int opt_len, int unit,
-+	       int hdrlen, int debug)
-+{
-+    return mppe_init(arg, options, opt_len, unit, hdrlen, 0, debug, 1);
-+}
-+
-+
-+static int
-+mppe_decomp_init(void *arg, unsigned char *options, int opt_len, int unit,
-+		 int hdrlen, int mru, int debug)
-+{
-+    return mppe_init(arg, options, opt_len, unit, hdrlen, mru, debug, 0);
-+}
-+
-+static void
-+mppe_comp_reset(void *arg)
-+{
-+    struct ppp_mppe_state *state = (struct ppp_mppe_state *)arg;
-+
-+    if (state->debug)
-+	printk(KERN_DEBUG "%s%d: resetting MPPC/MPPE compressor\n",
-+	       __FUNCTION__, state->unit);
-+
-+    state->nextflushed = 1;
-+    if (state->mppe)
-+	arc4_setkey(state, state->session_key, state->keylen);
-+}
-+
-+static void
-+mppe_decomp_reset(void *arg)
-+{
-+    /* When MPPC/MPPE is in use, we shouldn't receive any CCP Reset-Ack.
-+       But when we receive such a packet, we just ignore it. */
-+    return;
-+}
-+
-+static void
-+mppe_stats(void *arg, struct compstat *stats)
-+{
-+    struct ppp_mppe_state *state = (struct ppp_mppe_state *)arg;
-+
-+    *stats = state->stats;
-+}
-+
-+/***************************/
-+/**** Compression stuff ****/
-+/***************************/
-+/* inserts 1 to 8 bits into the output buffer */
-+static inline void putbits8(u8 *buf, u32 val, const u32 n, u32 *i, u32 *l)
-+{
-+    buf += *i;
-+    if (*l >= n) {
-+	*l = (*l) - n;
-+	val <<= *l;
-+	*buf = *buf | (val & 0xff);
-+	if (*l == 0) {
-+	    *l = 8;
-+	    (*i)++;
-+	    *(++buf) = 0;
-+	}
-+    } else {
-+	(*i)++;
-+	*l = 8 - n + (*l);
-+	val <<= *l;
-+	*buf = *buf | ((val >> 8) & 0xff);
-+	*(++buf) = val & 0xff;
-+    }
-+}
-+
-+/* inserts 9 to 16 bits into the output buffer */
-+static inline void putbits16(u8 *buf, u32 val, const u32 n, u32 *i, u32 *l)
-+{
-+    buf += *i;
-+    if (*l >= n - 8) {
-+	(*i)++;
-+	*l = 8 - n + (*l);
-+	val <<= *l;
-+	*buf = *buf | ((val >> 8) & 0xff);
-+	*(++buf) = val & 0xff;
-+	if (*l == 0) {
-+	    *l = 8;
-+	    (*i)++;
-+	    *(++buf) = 0;
-+	}
-+    } else {
-+	(*i)++; (*i)++;
-+	*l = 16 - n + (*l);
-+	val <<= *l;
-+	*buf = *buf | ((val >> 16) & 0xff);
-+	*(++buf) = (val >> 8) & 0xff;
-+	*(++buf) = val & 0xff;
-+    }
-+}
-+
-+/* inserts 17 to 24 bits into the output buffer */
-+static inline void putbits24(u8 *buf, u32 val, const u32 n, u32 *i, u32 *l)
-+{
-+    buf += *i;
-+    if (*l >= n - 16) {
-+	(*i)++; (*i)++;
-+	*l = 16 - n + (*l);
-+	val <<= *l;
-+	*buf = *buf | ((val >> 16) & 0xff);
-+	*(++buf) = (val >> 8) & 0xff;
-+	*(++buf) = val & 0xff;
-+	if (*l == 0) {
-+	    *l = 8;
-+	    (*i)++;
-+	    *(++buf) = 0;
-+	}
-+    } else {
-+	(*i)++; (*i)++; (*i)++;
-+	*l = 24 - n + (*l);
-+	val <<= *l;
-+	*buf = *buf | ((val >> 24) & 0xff);
-+	*(++buf) = (val >> 16) & 0xff;
-+	*(++buf) = (val >> 8) & 0xff;
-+	*(++buf) = val & 0xff;
-+    }
-+}
-+
-+static int
-+mppc_compress(struct ppp_mppe_state *state, unsigned char *ibuf,
-+	      unsigned char *obuf, int isize, int osize)
-+{
-+    u32 olen, off, len, idx, i, l;
-+    u8 *hist, *sbuf, *p, *q, *r, *s;
-+
-+    /*  
-+	At this point, to avoid possible buffer overflow caused by packet
-+	expansion during/after compression,  we should make sure that
-+	osize >= (((isize*9)/8)+1)+2, but we don't do that because in
-+	ppp_generic.c we simply allocate bigger obuf.
-+
-+	Maximum MPPC packet expansion is 12.5%. This is the worst case when
-+	all octets in the input buffer are >= 0x80 and we cannot find any
-+	repeated tokens. Additionally we have to reserve 2 bytes for MPPE/MPPC
-+	status bits and coherency counter.
-+    */
-+
-+    hist = state->hist + MPPE_HIST_LEN;
-+    /* check if there is enough room at the end of the history */
-+    if (state->histptr + isize >= 2*MPPE_HIST_LEN) {
-+	state->bits |= MPPE_BIT_RESET;
-+	state->histptr = MPPE_HIST_LEN;
-+	memcpy(state->hist, hist, MPPE_HIST_LEN);
-+    }
-+    /* add packet to the history; isize must be <= MPPE_HIST_LEN */
-+    sbuf = state->hist + state->histptr;
-+    memcpy(sbuf, ibuf, isize);
-+    state->histptr += isize;
-+
-+    /* compress data */
-+    r = sbuf + isize;
-+    *obuf = olen = i = 0;
-+    l = 8;
-+    while (i < isize - 2) {
-+	s = q = sbuf + i;
-+	idx = ((40543*((((s[0]<<4)^s[1])<<4)^s[2]))>>4) & 0x1fff;
-+	p = hist + state->hash[idx];
-+	state->hash[idx] = (u16) (s - hist);
-+	off = s - p;
-+	if (off > MPPE_HIST_LEN - 1 || off < 1 || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++) {
-+	    /* no match found; encode literal byte */
-+	    if (ibuf[i] < 0x80) {		/* literal byte < 0x80 */
-+		putbits8(obuf, (u32) ibuf[i], 8, &olen, &l);
-+	    } else {				/* literal byte >= 0x80 */
-+		putbits16(obuf, (u32) (0x100|(ibuf[i]&0x7f)), 9, &olen, &l);
-+	    }
-+	    ++i;
-+	    continue;
-+	}
-+	if (r - q >= 64) {
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
-+	    *p++ != *s++;
-+	    if (s - q == 64) {
-+		p--; s--;
-+		while((*p++ == *s++) && (s < r) && (p < q));
-+	    }
-+	} else {
-+	    while((*p++ == *s++) && (s < r) && (p < q));
-+	}
-+	len = s - q - 1;
-+	i += len;
-+
-+	/* at least 3 character match found; code data */
-+	/* encode offset */
-+	if (off < 64) {			/* 10-bit offset; 0 <= offset < 64 */
-+	    putbits16(obuf, 0x3c0|off, 10, &olen, &l);
-+	} else if (off < 320) {		/* 12-bit offset; 64 <= offset < 320 */
-+	    putbits16(obuf, 0xe00|(off-64), 12, &olen, &l);
-+	} else if (off < 8192) {	/* 16-bit offset; 320 <= offset < 8192 */
-+	    putbits16(obuf, 0xc000|(off-320), 16, &olen, &l);
-+	} else {
-+	    /* This shouldn't happen; we return 0 what means "packet expands",
-+	    and we send packet uncompressed. */
-+	    if (state->debug)
-+		printk(KERN_DEBUG "%s%d: wrong offset value: %d\n",
-+		       __FUNCTION__, state->unit, off);
-+	    return 0;
-+	}
-+	/* encode length of match */
-+	if (len < 4) {			/* length = 3 */
-+	    putbits8(obuf, 0, 1, &olen, &l);
-+	} else if (len < 8) {		/* 4 <= length < 8 */
-+	    putbits8(obuf, 0x08|(len&0x03), 4, &olen, &l);
-+	} else if (len < 16) {		/* 8 <= length < 16 */
-+	    putbits8(obuf, 0x30|(len&0x07), 6, &olen, &l);
-+	} else if (len < 32) {		/* 16 <= length < 32 */
-+	    putbits8(obuf, 0xe0|(len&0x0f), 8, &olen, &l);
-+	} else if (len < 64) {		/* 32 <= length < 64 */
-+	    putbits16(obuf, 0x3c0|(len&0x1f), 10, &olen, &l);
-+	} else if (len < 128) {		/* 64 <= length < 128 */
-+	    putbits16(obuf, 0xf80|(len&0x3f), 12, &olen, &l);
-+	} else if (len < 256) {		/* 128 <= length < 256 */
-+	    putbits16(obuf, 0x3f00|(len&0x7f), 14, &olen, &l);
-+	} else if (len < 512) {		/* 256 <= length < 512 */
-+	    putbits16(obuf, 0xfe00|(len&0xff), 16, &olen, &l);
-+	} else if (len < 1024) {	/* 512 <= length < 1024 */
-+	    putbits24(obuf, 0x3fc00|(len&0x1ff), 18, &olen, &l);
-+	} else if (len < 2048) {	/* 1024 <= length < 2048 */
-+	    putbits24(obuf, 0xff800|(len&0x3ff), 20, &olen, &l);
-+	} else if (len < 4096) {	/* 2048 <= length < 4096 */
-+	    putbits24(obuf, 0x3ff000|(len&0x7ff), 22, &olen, &l);
-+	} else if (len < 8192) {	/* 4096 <= length < 8192 */
-+	    putbits24(obuf, 0xffe000|(len&0xfff), 24, &olen, &l);
-+	} else {
-+	    /* This shouldn't happen; we return 0 what means "packet expands",
-+	    and send packet uncompressed. */
-+	    if (state->debug)
-+		printk(KERN_DEBUG "%s%d: wrong length of match value: %d\n",
-+		       __FUNCTION__, state->unit, len);
-+	    return 0;
-+	}
-+    }
-+
-+    /* Add remaining octets to the output */
-+    while(isize - i > 0) {
-+	if (ibuf[i] < 0x80) {	/* literal byte < 0x80 */
-+	    putbits8(obuf, (u32) ibuf[i++], 8, &olen, &l);
-+	} else {		/* literal byte >= 0x80 */
-+	    putbits16(obuf, (u32) (0x100|(ibuf[i++]&0x7f)), 9, &olen, &l);
-+	}
-+    }
-+    /* Reset unused bits of the last output octet */
-+    if ((l != 0) && (l != 8)) {
-+	putbits8(obuf, 0, l, &olen, &l);
-+    }
-+
-+    return (int) olen;
-+}
-+
-+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;
-+    int proto, olen, complen, off;
-+    unsigned char *wptr;
-+
-+    /* Check that the protocol is in the range we handle. */
-+    proto = PPP_PROTOCOL(ibuf);
-+    if (proto < 0x0021 || proto > 0x00fa)
-+	return 0;
-+
-+    wptr = obuf;
-+    /* Copy over the PPP header */
-+    wptr[0] = PPP_ADDRESS(ibuf);
-+    wptr[1] = PPP_CONTROL(ibuf);
-+    wptr[2] = PPP_COMP >> 8;
-+    wptr[3] = PPP_COMP;
-+    wptr += PPP_HDRLEN + (MPPE_OVHD / 2); /* Leave two octets for MPPE/MPPC bits */
-+
-+    /* 
-+     * In ver. 0.99 protocol field was compressed. Deflate and BSD compress
-+     * do PFC before actual compression, RCF2118 and RFC3078 are not precise
-+     * on this topic so I decided to do PFC. Unfortunately this change caused
-+     * incompatibility with older/other MPPE/MPPC modules. I have received
-+     * a lot of complaints from unexperienced users so I have decided to revert
-+     * to previous state, i.e. the protocol field is sent uncompressed now.
-+     * Although this may be changed in the future.
-+     *
-+     * Receiving side (mppe_decompress()) still accepts packets with compressed
-+     * and uncompressed protocol field so you shouldn't get "Unsupported protocol
-+     * 0x2145 received" messages anymore.
-+     */
-+    //off = (proto > 0xff) ? 2 : 3; /* PFC - skip first protocol byte if 0 */
-+    off = 2;
-+
-+    ibuf += off;
-+
-+    mppe_increase_ccount(state);
-+
-+    if (state->nextflushed) {
-+	state->bits |= MPPE_BIT_FLUSHED;
-+	state->nextflushed = 0;
-+	if (state->mppe && !state->stateless) {
-+	    /*
-+	     * If this is the flag packet, the key has been already changed in
-+	     * mppe_increase_ccount() so we dont't do it once again.
-+	     */
-+	    if ((state->ccount & 0xff) != 0xff) {
-+		arc4_setkey(state, state->session_key, state->keylen);
-+	    }
-+	}
-+	if (state->mppc) { /* reset history */
-+	    state->bits |= MPPE_BIT_RESET;
-+	    state->histptr = MPPE_HIST_LEN;
-+	    memset(state->hist + MPPE_HIST_LEN, 0, MPPE_HIST_LEN*sizeof(u8));
-+	}
-+    }
-+
-+    if (state->mppc && !state->mppe) { /* Do only compression */
-+	complen = mppc_compress(state, ibuf, wptr, isize - off,
-+				osize - PPP_HDRLEN - (MPPE_OVHD / 2));
-+	/*
-+	 * TODO: Implement an heuristics to handle packet expansion in a smart
-+	 * way. Now, when a packet expands, we send it as uncompressed and
-+	 * when next packet is sent we have to reset compressor's history.
-+	 * Maybe it would be better to send such packet as compressed in order
-+	 * to keep history's continuity.
-+	 */
-+	if ((complen > isize) || (complen > osize - PPP_HDRLEN) ||
-+	    (complen == 0)) {
-+	    /* packet expands */
-+	    state->nextflushed = 1;
-+	    memcpy(wptr, ibuf, isize - off);
-+	    olen = isize - (off - 2) + MPPE_OVHD;
-+	    (state->stats).inc_bytes += olen;
-+	    (state->stats).inc_packets++;
-+	} else {
-+	    state->bits |= MPPE_BIT_COMP;
-+	    olen = complen + PPP_HDRLEN + (MPPE_OVHD / 2);
-+	    (state->stats).comp_bytes += olen;
-+	    (state->stats).comp_packets++;
-+	}
-+    } else { /* Do encryption with or without compression */
-+	state->bits |= MPPE_BIT_ENCRYPTED;
-+	if (!state->mppc && state->mppe) { /* Do only encryption */
-+	    /* read from ibuf, write to wptr, adjust for PPP_HDRLEN */
-+	    arc4_encrypt(state, ibuf, isize - off, wptr);
-+	    olen = isize - (off - 2) + MPPE_OVHD;
-+	    (state->stats).inc_bytes += olen;
-+	    (state->stats).inc_packets++;
-+	} else { /* Do compression and then encryption - RFC3078 */
-+	    complen = mppc_compress(state, ibuf, wptr, isize - off,
-+				    osize - PPP_HDRLEN - (MPPE_OVHD / 2));
-+	    /*
-+	     * TODO: Implement an heuristics to handle packet expansion in a smart
-+	     * way. Now, when a packet expands, we send it as uncompressed and
-+	     * when next packet is sent we have to reset compressor's history.
-+	     * Maybe it would be good to send such packet as compressed in order
-+	     * to keep history's continuity.
-+	     */
-+	    if ((complen > isize) || (complen > osize - PPP_HDRLEN) ||
-+		(complen == 0)) {
-+		/* packet expands */
-+		state->nextflushed = 1;
-+		arc4_encrypt(state, ibuf, isize - off, wptr);
-+		olen = isize - (off - 2) + MPPE_OVHD;
-+		(state->stats).inc_bytes += olen;
-+		(state->stats).inc_packets++;
-+	    } else {
-+		state->bits |= MPPE_BIT_COMP;
-+		/* Hack warning !!! RC4 implementation which we use does
-+		   encryption "in place" - it means that input and output
-+		   buffers can be *the same* memory area. Therefore we don't
-+		   need to use a temporary buffer. But be careful - other
-+		   implementations don't have to be so nice.
-+		   I used to use ibuf as temporary buffer here, but it led
-+		   packet sniffers into error. Thanks to Wilfried Weissmann
-+		   for pointing that. */
-+		arc4_encrypt(state, wptr, complen, wptr);
-+		olen = complen + PPP_HDRLEN + (MPPE_OVHD / 2);
-+		(state->stats).comp_bytes += olen;
-+		(state->stats).comp_packets++;
-+	    }
-+	}
-+    }
-+
-+    /* write status bits and coherency counter into the output buffer */
-+    wptr = obuf + PPP_HDRLEN;
-+    wptr[0] = MPPE_CTRLHI(state);
-+    wptr[1] = MPPE_CTRLLO(state);
-+
-+    state->bits = 0;
-+
-+    (state->stats).unc_bytes += isize;
-+    (state->stats).unc_packets++;
-+
-+    return olen;
-+}
-+
-+/***************************/
-+/*** Decompression stuff ***/
-+/***************************/
-+static inline u32 getbits(const u8 *buf, const u32 n, u32 *i, u32 *l)
-+{
-+    static const u32 m[] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff};
-+    u32 res, ol;
-+
-+    ol = *l;
-+    if (*l >= n) {
-+	*l = (*l) - n;
-+	res = (buf[*i] & m[ol]) >> (*l);
-+	if (*l == 0) {
-+	    *l = 8;
-+	    (*i)++;
-+	}
-+    } else {
-+	*l = 8 - n + (*l);
-+	res = (buf[(*i)++] & m[ol]) << 8;
-+	res = (res | buf[*i]) >> (*l);
-+    }
-+
-+    return res;
-+}
-+
-+static inline u32 getbyte(const u8 *buf, const u32 i, const u32 l)
-+{
-+    if (l == 8) {
-+	return buf[i];
-+    } else {
-+	return (((buf[i] << 8) | buf[i+1]) >> l) & 0xff;
-+    }
-+}
-+
-+static inline void lamecopy(u8 *dst, u8 *src, u32 len)
-+{
-+    while (len--)
-+	*dst++ = *src++;
-+}
-+
-+static int
-+mppc_decompress(struct ppp_mppe_state *state, unsigned char *ibuf,
-+		unsigned char *obuf, int isize, int osize)
-+{
-+    u32 olen, off, len, bits, val, sig, i, l;
-+    u8 *history, *s;
-+
-+    history = state->hist + state->histptr;
-+    olen = len = i = 0;
-+    l = 8;
-+    bits = isize * 8;
-+    while (bits >= 8) {
-+	val = getbyte(ibuf, i++, l);
-+	if (val < 0x80) {		/* literal byte < 0x80 */
-+	    if (state->histptr < 2*MPPE_HIST_LEN) {
-+		/* copy uncompressed byte to the history */
-+		(state->hist)[(state->histptr)++] = (u8) val;
-+	    } else {
-+		/* buffer overflow; drop packet */
-+		if (state->debug)
-+		    printk(KERN_ERR "%s%d: trying to write outside history "
-+			   "buffer\n", __FUNCTION__, state->unit);
-+		return DECOMP_ERROR;
-+	    }
-+	    olen++;
-+	    bits -= 8;
-+	    continue;
-+	}
-+
-+	sig = val & 0xc0;
-+	if (sig == 0x80) {		/* literal byte >= 0x80 */
-+	    if (state->histptr < 2*MPPE_HIST_LEN) {
-+		/* copy uncompressed byte to the history */
-+		(state->hist)[(state->histptr)++] = 
-+		    (u8) (0x80|((val&0x3f)<<1)|getbits(ibuf, 1 , &i ,&l));
-+	    } else {
-+		/* buffer overflow; drop packet */
-+		if (state->debug)
-+		    printk(KERN_ERR "%s%d: trying to write outside history "
-+			   "buffer\n", __FUNCTION__, state->unit);
-+		return DECOMP_ERROR;
-+	    }
-+	    olen++;
-+	    bits -= 9;
-+	    continue;
-+	}
-+
-+	/* Not a literal byte so it must be an (offset,length) pair */
-+	/* decode offset */
-+	sig = val & 0xf0;
-+	if (sig == 0xf0) {		/* 10-bit offset; 0 <= offset < 64 */
-+	    off = (((val&0x0f)<<2)|getbits(ibuf, 2 , &i ,&l));
-+	    bits -= 10;
-+	} else {
-+	    if (sig == 0xe0) {		/* 12-bit offset; 64 <= offset < 320 */
-+		off = ((((val&0x0f)<<4)|getbits(ibuf, 4 , &i ,&l))+64);
-+		bits -= 12;
-+	    } else {
-+		if ((sig&0xe0) == 0xc0) {/* 16-bit offset; 320 <= offset < 8192 */
-+		    off = ((((val&0x1f)<<8)|getbyte(ibuf, i++, l))+320);
-+		    bits -= 16;
-+		    if (off > MPPE_HIST_LEN - 1) {
-+			if (state->debug)
-+			    printk(KERN_DEBUG "%s%d: too big offset value: %d\n",
-+				   __FUNCTION__, state->unit, off);
-+			return DECOMP_ERROR;
-+		    }
-+		} else {		/* this shouldn't happen */
-+		    if (state->debug)
-+			printk(KERN_DEBUG "%s%d: cannot decode offset value\n",
-+			       __FUNCTION__, state->unit);
-+		    return DECOMP_ERROR;
-+		}
-+	    }
-+	}
-+	/* decode length of match */
-+	val = getbyte(ibuf, i, l);
-+	if ((val & 0x80) == 0x00) {			/* len = 3 */
-+	    len = 3;
-+	    bits--;
-+	    getbits(ibuf, 1 , &i ,&l);
-+	} else if ((val & 0xc0) == 0x80) {		/* 4 <= len < 8 */
-+	    len = 0x04 | ((val>>4) & 0x03);
-+	    bits -= 4;
-+	    getbits(ibuf, 4 , &i ,&l);
-+	} else if ((val & 0xe0) == 0xc0) {		/* 8 <= len < 16 */
-+	    len = 0x08 | ((val>>2) & 0x07);
-+	    bits -= 6;
-+	    getbits(ibuf, 6 , &i ,&l);
-+	} else if ((val & 0xf0) == 0xe0) {		/* 16 <= len < 32 */
-+	    len = 0x10 | (val & 0x0f);
-+	    bits -= 8;
-+	    i++;
-+	} else {
-+	    bits -= 8;
-+	    val = (val << 8) | getbyte(ibuf, ++i, l);
-+	    if ((val & 0xf800) == 0xf000) {		/* 32 <= len < 64 */
-+		len = 0x0020 | ((val >> 6) & 0x001f);
-+		bits -= 2;
-+		getbits(ibuf, 2 , &i ,&l);
-+	    } else if ((val & 0xfc00) == 0xf800) {	/* 64 <= len < 128 */
-+		len = 0x0040 | ((val >> 4) & 0x003f);
-+		bits -= 4;
-+		getbits(ibuf, 4 , &i ,&l);
-+	    } else if ((val & 0xfe00) == 0xfc00) {	/* 128 <= len < 256 */
-+		len = 0x0080 | ((val >> 2) & 0x007f);
-+		bits -= 6;
-+		getbits(ibuf, 6 , &i ,&l);
-+	    } else if ((val & 0xff00) == 0xfe00) {	/* 256 <= len < 512 */
-+		len = 0x0100 | (val & 0x00ff);
-+		bits -= 8;
-+		i++;
-+	    } else {
-+		bits -= 8;
-+		val = (val << 8) | getbyte(ibuf, ++i, l);
-+		if ((val & 0xff8000) == 0xff0000) {	/* 512 <= len < 1024 */
-+		    len = 0x000200 | ((val >> 6) & 0x0001ff);
-+		    bits -= 2;
-+		    getbits(ibuf, 2 , &i ,&l);
-+		} else if ((val & 0xffc000) == 0xff8000) {/* 1024 <= len < 2048 */
-+		    len = 0x000400 | ((val >> 4) & 0x0003ff);
-+		    bits -= 4;
-+		    getbits(ibuf, 4 , &i ,&l);
-+		} else if ((val & 0xffe000) == 0xffc000) {/* 2048 <= len < 4096 */
-+		    len = 0x000800 | ((val >> 2) & 0x0007ff);
-+		    bits -= 6;
-+		    getbits(ibuf, 6 , &i ,&l);
-+		} else if ((val & 0xfff000) == 0xffe000) {/* 4096 <= len < 8192 */
-+		    len = 0x001000 | (val & 0x000fff);
-+		    bits -= 8;
-+		    i++;
-+		} else {				/* this shouldn't happen */
-+		    if (state->debug)
-+			printk(KERN_DEBUG "%s%d: wrong length code: 0x%X\n",
-+			       __FUNCTION__, state->unit, val);
-+		    return DECOMP_ERROR;
-+		}
-+	    }
-+	}
-+	s = state->hist + state->histptr;
-+	state->histptr += len;
-+	olen += len;
-+	if (state->histptr < 2*MPPE_HIST_LEN) {
-+	    /* copy uncompressed bytes to the history */
-+
-+	    /* In some cases len may be greater than off. It means that memory
-+	     * areas pointed by s and s-off overlap. I had used memmove() here
-+	     * because I thought that it acts as libc's version. Unfortunately,
-+	     * I was wrong. :-) I got strange errors sometimes. Wilfried suggested
-+	     * using of byte by byte copying here and strange errors disappeared.
-+	     */
-+	    lamecopy(s, s - off, len);
-+	} else {
-+	    /* buffer overflow; drop packet */
-+	    if (state->debug)
-+		printk(KERN_ERR "%s%d: trying to write outside history "
-+		       "buffer\n", __FUNCTION__, state->unit);
-+	    return DECOMP_ERROR;
-+	}
-+    }
-+
-+    /* Do PFC decompression */
-+    len = olen;
-+    if ((history[0] & 0x01) != 0) {
-+	obuf[0] = 0;
-+	obuf++;
-+	len++;
-+    }
-+
-+    if (len <= osize) {
-+	/* copy uncompressed packet to the output buffer */
-+	memcpy(obuf, history, olen);
-+    } else {
-+	/* buffer overflow; drop packet */
-+	if (state->debug)
-+	    printk(KERN_ERR "%s%d: too big uncompressed packet: %d\n",
-+		   __FUNCTION__, state->unit, len + (PPP_HDRLEN / 2));
-+	return DECOMP_ERROR;
-+    }
-+
-+    return (int) len;
-+}
-+
-+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;
-+    int seq, bits, uncomplen;
-+
-+    if (isize <= PPP_HDRLEN + MPPE_OVHD) {
-+	if (state->debug) {
-+	    printk(KERN_DEBUG "%s%d: short packet (len=%d)\n",  __FUNCTION__,
-+		   state->unit, isize);
-+	}
-+	return DECOMP_ERROR;
-+    }
-+
-+    /* Get coherency counter and control bits from input buffer */
-+    seq = MPPE_CCOUNT(ibuf);
-+    bits = MPPE_BITS(ibuf);
-+
-+    if (state->stateless) {
-+	/* RFC 3078, sec 8.1. */
-+	mppe_increase_ccount(state);
-+	if ((seq != state->ccount) && state->debug)
-+	    printk(KERN_DEBUG "%s%d: bad sequence number: %d, expected: %d\n",
-+		   __FUNCTION__, state->unit, seq, state->ccount);
-+	while (seq != state->ccount)
-+	    mppe_increase_ccount(state);
-+    } else {
-+	/* RFC 3078, sec 8.2. */
-+	if (state->flushexpected) { /* discard state */
-+	    if ((bits & MPPE_BIT_FLUSHED)) { /* we received expected FLUSH bit */
-+		while (seq != state->ccount)
-+		    mppe_increase_ccount(state);
-+		state->flushexpected = 0;
-+	    } else /* drop packet*/
-+		return DECOMP_ERROR;
-+	} else { /* normal state */
-+	    mppe_increase_ccount(state);
-+	    if (seq != state->ccount) {
-+		/* Packet loss detected, enter the discard state. */
-+		if (state->debug)
-+		    printk(KERN_DEBUG "%s%d: bad sequence number: %d, expected: %d\n",
-+			   __FUNCTION__, state->unit, seq, state->ccount);
-+		state->flushexpected = 1;
-+		return DECOMP_ERROR;
-+	    }
-+	}
-+	if (state->mppe && (bits & MPPE_BIT_FLUSHED)) {
-+	    arc4_setkey(state, state->session_key, state->keylen);
-+	}
-+    }
-+
-+    if (state->mppc && (bits & (MPPE_BIT_FLUSHED | MPPE_BIT_RESET))) {
-+	state->histptr = MPPE_HIST_LEN;
-+	if ((bits & MPPE_BIT_FLUSHED)) {
-+	    memset(state->hist + MPPE_HIST_LEN, 0, MPPE_HIST_LEN*sizeof(u8));
-+	} else
-+	    if ((bits & MPPE_BIT_RESET)) {
-+		memcpy(state->hist, state->hist + MPPE_HIST_LEN, MPPE_HIST_LEN);
-+	    }
-+    }
-+
-+    /* Fill in the first part of the PPP header. The protocol field
-+       comes from the decompressed data. */
-+    obuf[0] = PPP_ADDRESS(ibuf);
-+    obuf[1] = PPP_CONTROL(ibuf);
-+    obuf += PPP_HDRLEN / 2;
-+
-+    if (state->mppe) { /* process encrypted packet */
-+	if ((bits & MPPE_BIT_ENCRYPTED)) {
-+	    /* OK, packet encrypted, so decrypt it */
-+	    if (state->mppc && (bits & MPPE_BIT_COMP)) {
-+		/* Hack warning !!! RC4 implementation which we use does
-+		   decryption "in place" - it means that input and output
-+		   buffers can be *the same* memory area. Therefore we don't
-+		   need to use a temporary buffer. But be careful - other
-+		   implementations don't have to be so nice. */
-+		arc4_decrypt(state, ibuf + PPP_HDRLEN +	(MPPE_OVHD / 2), isize -
-+			     PPP_HDRLEN - (MPPE_OVHD / 2), ibuf + PPP_HDRLEN +
-+			     (MPPE_OVHD / 2));
-+		uncomplen = mppc_decompress(state, ibuf + PPP_HDRLEN +
-+					    (MPPE_OVHD / 2), obuf, isize -
-+					    PPP_HDRLEN - (MPPE_OVHD / 2),
-+					    osize - (PPP_HDRLEN / 2));
-+		if (uncomplen == DECOMP_ERROR) {
-+		    state->flushexpected = 1;
-+		    return DECOMP_ERROR;
-+		}
-+		uncomplen += PPP_HDRLEN / 2;
-+		(state->stats).comp_bytes += isize;
-+		(state->stats).comp_packets++;
-+	    } else {
-+		uncomplen = isize - MPPE_OVHD;
-+		/* Decrypt the first byte in order to check if it is
-+		   compressed or uncompressed protocol field */
-+		arc4_decrypt(state, ibuf + PPP_HDRLEN +	(MPPE_OVHD / 2), 1, obuf);
-+		/* Do PFC decompression */
-+		if ((obuf[0] & 0x01) != 0) {
-+		    obuf[1] = obuf[0];
-+		    obuf[0] = 0;
-+		    obuf++;
-+		    uncomplen++;
-+		}
-+		/* And finally, decrypt the rest of the frame. */
-+		arc4_decrypt(state, ibuf + PPP_HDRLEN +	(MPPE_OVHD / 2) + 1,
-+			     isize - PPP_HDRLEN - (MPPE_OVHD / 2) - 1, obuf + 1);
-+		(state->stats).inc_bytes += isize;
-+		(state->stats).inc_packets++;
-+	    }
-+	} else { /* this shouldn't happen */
-+	    if (state->debug)
-+		printk(KERN_ERR "%s%d: encryption negotiated but not an "
-+		       "encrypted packet received\n", __FUNCTION__, state->unit);
-+	    mppe_change_key(state, 0);
-+	    state->flushexpected = 1;
-+	    return DECOMP_ERROR;
-+	}
-+    } else {
-+	if (state->mppc) { /* no MPPE, only MPPC */
-+	    if ((bits & MPPE_BIT_COMP)) {
-+		uncomplen = mppc_decompress(state, ibuf + PPP_HDRLEN +
-+					    (MPPE_OVHD / 2), obuf, isize -
-+					    PPP_HDRLEN - (MPPE_OVHD / 2),
-+					    osize - (PPP_HDRLEN / 2));
-+		if (uncomplen == DECOMP_ERROR) {
-+		    state->flushexpected = 1;
-+		    return DECOMP_ERROR;
-+		}
-+		uncomplen += PPP_HDRLEN / 2;
-+		(state->stats).comp_bytes += isize;
-+		(state->stats).comp_packets++;
-+	    } else {
-+		memcpy(obuf, ibuf + PPP_HDRLEN + (MPPE_OVHD / 2), isize -
-+		       PPP_HDRLEN - (MPPE_OVHD / 2));
-+		uncomplen = isize - MPPE_OVHD;
-+		(state->stats).inc_bytes += isize;
-+		(state->stats).inc_packets++;
-+	    }
-+	} else { /* this shouldn't happen */
-+	    if (state->debug)
-+		printk(KERN_ERR "%s%d: error - not an  MPPC or MPPE frame "
-+		       "received\n", __FUNCTION__, state->unit);
-+	    state->flushexpected = 1;
-+	    return DECOMP_ERROR;
-+	}
-+    }
-+
-+    (state->stats).unc_bytes += uncomplen;
-+    (state->stats).unc_packets++;
-+
-+    return uncomplen;
-+}
-+
-+
-+/************************************************************
-+ * Module interface table
-+ ************************************************************/
-+
-+/* These are in ppp_generic.c */
-+extern int  ppp_register_compressor   (struct compressor *cp);
-+extern void ppp_unregister_compressor (struct compressor *cp);
-+
-+/*
-+ * Functions exported to ppp_generic.c.
-+ *
-+ * In case of MPPC/MPPE there is no need to process incompressible data
-+ * because such a data is sent in MPPC/MPPE frame. Therefore the (*incomp)
-+ * callback function isn't needed.
-+ */
-+struct compressor ppp_mppe = {
-+    .compress_proto =	CI_MPPE,
-+    .comp_alloc =	mppe_comp_alloc,
-+    .comp_free =	mppe_comp_free,
-+    .comp_init =	mppe_comp_init,
-+    .comp_reset =	mppe_comp_reset,
-+    .compress =		mppe_compress,
-+    .comp_stat =	mppe_stats,
-+    .decomp_alloc =	mppe_decomp_alloc,
-+    .decomp_free =	mppe_comp_free,
-+    .decomp_init =	mppe_decomp_init,
-+    .decomp_reset =	mppe_decomp_reset,
-+    .decompress =	mppe_decompress,
-+    .incomp =		NULL,
-+    .decomp_stat =	mppe_stats,
-+    .owner =		THIS_MODULE
-+};
-+
-+/************************************************************
-+ * Module support routines
-+ ************************************************************/
-+
-+int __init mppe_module_init(void)
-+{
-+    int answer;
-+
-+    if (!(crypto_alg_available("arc4", 0) && crypto_alg_available("sha1", 0))) {
-+	printk(KERN_ERR "Kernel doesn't provide ARC4 and/or SHA1 algorithms "
-+	       "required by MPPE/MPPC. Check CryptoAPI configuration.\n");
-+	return -ENODEV;
-+    }
-+
-+    /* Allocate space for SHAPad1, SHAPad2 and ... */
-+    sha_pad = kmalloc(sizeof(struct sha_pad), GFP_KERNEL);
-+    if (sha_pad == NULL)
-+	return -ENOMEM;
-+    /* ... initialize them */
-+    memset(sha_pad->sha_pad1, 0x00, sizeof(sha_pad->sha_pad1));
-+    memset(sha_pad->sha_pad2, 0xf2, sizeof(sha_pad->sha_pad2));
-+
-+    answer = ppp_register_compressor(&ppp_mppe);
-+    if (answer == 0) {
-+	printk(KERN_INFO "MPPE/MPPC encryption/compression module registered\n");
-+    }
-+    return answer;
-+}
-+
-+void __exit mppe_module_cleanup(void)
-+{
-+    kfree(sha_pad);
-+    ppp_unregister_compressor(&ppp_mppe);
-+    printk(KERN_INFO "MPPE/MPPC encryption/compression module unregistered\n");
-+}
-+
-+module_init(mppe_module_init);
-+module_exit(mppe_module_cleanup);
-+
-+MODULE_AUTHOR("Jan Dubiec <jdx@slackware.pl>");
-+MODULE_DESCRIPTION("MPPE/MPPC encryption/compression module for Linux");
-+MODULE_VERSION("1.3");
-+MODULE_LICENSE("Dual BSD/GPL");
-+MODULE_ALIAS("ppp-compress-" __stringify(CI_MPPE));
---- a/include/linux/crypto.h
-+++ b/include/linux/crypto.h
-@@ -309,7 +309,18 @@ int crypto_unregister_alg(struct crypto_
- /*
-  * Algorithm query interface.
-  */
-+#ifdef CONFIG_CRYPTO
-+int crypto_alg_available(const char *name, u32 flags)
-+	__deprecated_for_modules;
- int crypto_has_alg(const char *name, u32 type, u32 mask);
-+#else
-+static int crypto_alg_available(const char *name, u32 flags)
-+	__deprecated_for_modules;
-+static inline int crypto_has_alg(const char *name, u32 type, u32 mask)
-+{
-+	return 0;
-+}
-+#endif
- 
- /*
-  * Transforms: user-instantiated objects which encapsulate algorithms
-@@ -1101,6 +1112,16 @@ static inline void crypto_cipher_decrypt
- 						dst, src);
- }
- 
-+void crypto_digest_init(struct crypto_tfm *tfm) __deprecated_for_modules;
-+void crypto_digest_update(struct crypto_tfm *tfm,
-+			  struct scatterlist *sg, unsigned int nsg)
-+	__deprecated_for_modules;
-+void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
-+	__deprecated_for_modules;
-+void crypto_digest_digest(struct crypto_tfm *tfm,
-+			  struct scatterlist *sg, unsigned int nsg, u8 *out)
-+	__deprecated_for_modules;
-+
- static inline struct crypto_hash *__crypto_hash_cast(struct crypto_tfm *tfm)
- {
- 	return (struct crypto_hash *)tfm;
-@@ -1113,6 +1134,14 @@ static inline struct crypto_hash *crypto
- 	return __crypto_hash_cast(tfm);
- }
- 
-+static int crypto_digest_setkey(struct crypto_tfm *tfm, const u8 *key,
-+				unsigned int keylen) __deprecated;
-+static inline int crypto_digest_setkey(struct crypto_tfm *tfm,
-+                                       const u8 *key, unsigned int keylen)
-+{
-+	return tfm->crt_hash.setkey(crypto_hash_cast(tfm), key, keylen);
-+}
-+
- static inline struct crypto_hash *crypto_alloc_hash(const char *alg_name,
- 						    u32 type, u32 mask)
- {
---- a/include/linux/ppp-comp.h
-+++ b/include/linux/ppp-comp.h
-@@ -26,7 +26,7 @@
-  */
- 
- /*
-- *  ==FILEVERSION 980319==
-+ *  ==FILEVERSION 20040509==
-  *
-  *  NOTE TO MAINTAINERS:
-  *     If you modify this file at all, please set the above date.
-@@ -78,7 +78,7 @@ struct compressor {
- 
- 	/* Compress a packet */
- 	int     (*compress) (void *state, unsigned char *rptr,
--			      unsigned char *obuf, int isize, int osize);
-+			     unsigned char *obuf, int isize, int osize);
- 
- 	/* Return compression statistics */
- 	void	(*comp_stat) (void *state, struct compstat *stats);
-@@ -99,7 +99,7 @@ struct compressor {
- 
- 	/* Decompress a packet. */
- 	int	(*decompress) (void *state, unsigned char *ibuf, int isize,
--				unsigned char *obuf, int osize);
-+			       unsigned char *obuf, int osize);
- 
- 	/* Update state for an incompressible packet received */
- 	void	(*incomp) (void *state, unsigned char *ibuf, int icnt);
-@@ -109,8 +109,6 @@ struct compressor {
- 
- 	/* Used in locking compressor modules */
- 	struct module *owner;
--	/* Extra skb space needed by the compressor algorithm */
--	unsigned int comp_extra;
- };
- 
- /*
-@@ -191,11 +189,40 @@ struct compressor {
- #define DEFLATE_CHK_SEQUENCE	0
- 
- /*
-- * Definitions for MPPE.
-+ * Definitions for MPPE/MPPC.
-  */
- 
--#define CI_MPPE                18      /* config option for MPPE */
--#define CILEN_MPPE              6      /* length of config option */
-+#define CI_MPPE			18	/* config option for MPPE */
-+#define CILEN_MPPE		6	/* length of config option */
-+
-+#define MPPE_OVHD		4	/* MPPE overhead */
-+#define MPPE_MAX_KEY_LEN	16	/* largest key length (128-bit) */
-+
-+#define MPPE_STATELESS          0x01	/* configuration bit H */
-+#define MPPE_40BIT              0x20	/* configuration bit L */
-+#define MPPE_56BIT              0x80	/* configuration bit M */
-+#define MPPE_128BIT             0x40	/* configuration bit S */
-+#define MPPE_MPPC               0x01	/* configuration bit C */
-+
-+/*
-+ * Definitions for Stac LZS.
-+ */
-+
-+#define CI_LZS			17	/* config option for Stac LZS */
-+#define CILEN_LZS		5	/* length of config option */
-+
-+#define LZS_OVHD		4	/* max. LZS overhead */
-+#define LZS_HIST_LEN		2048	/* LZS history size */
-+#define LZS_MAX_CCOUNT		0x0FFF	/* max. coherency counter value */
-+
-+#define LZS_MODE_NONE		0
-+#define LZS_MODE_LCB		1
-+#define LZS_MODE_CRC		2
-+#define LZS_MODE_SEQ		3
-+#define LZS_MODE_EXT		4
-+
-+#define LZS_EXT_BIT_FLUSHED	0x80	/* bit A */
-+#define LZS_EXT_BIT_COMP	0x20	/* bit C */
- 
- /*
-  * Definitions for other, as yet unsupported, compression methods.