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openwrt/obsolete-buildroot/sources/openwrt/kernel/patches/150-mppe-mppc-0.98.patch

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diff -ruN linux-2.4.21.orig/drivers/net/Config.in linux-2.4.21/drivers/net/Config.in
--- linux-2.4.21.orig/drivers/net/Config.in 2003-06-13 16:51:34.000000000 +0200
+++ linux-2.4.21/drivers/net/Config.in 2003-07-08 07:27:10.000000000 +0200
@@ -301,6 +301,7 @@
dep_tristate ' PPP support for sync tty ports' CONFIG_PPP_SYNC_TTY $CONFIG_PPP
dep_tristate ' PPP Deflate compression' CONFIG_PPP_DEFLATE $CONFIG_PPP
dep_tristate ' PPP BSD-Compress compression' CONFIG_PPP_BSDCOMP $CONFIG_PPP
+ dep_tristate ' Microsoft PPP compression/encryption (MPPC/MPPE)' CONFIG_PPP_MPPE $CONFIG_PPP
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
dep_tristate ' PPP over Ethernet (EXPERIMENTAL)' CONFIG_PPPOE $CONFIG_PPP
fi
diff -ruN linux-2.4.21.orig/drivers/net/Makefile linux-2.4.21/drivers/net/Makefile
--- linux-2.4.21.orig/drivers/net/Makefile 2003-06-13 16:51:34.000000000 +0200
+++ linux-2.4.21/drivers/net/Makefile 2003-07-14 23:53:15.000000000 +0200
@@ -18,8 +18,9 @@
export-objs := 8390.o arlan.o aironet4500_core.o aironet4500_card.o \
ppp_async.o ppp_generic.o slhc.o pppox.o auto_irq.o \
net_init.o mii.o
-list-multi := rcpci.o
+list-multi := rcpci.o ppp_mppe_mppc.o
rcpci-objs := rcpci45.o rclanmtl.o
+ppp_mppe_c-objs := ppp_mppe_mppc_comp.o ppp_mppe_crypto.o
ifeq ($(CONFIG_TULIP),y)
obj-y += tulip/tulip.o
@@ -149,6 +150,15 @@
obj-$(CONFIG_PPP_SYNC_TTY) += ppp_synctty.o
obj-$(CONFIG_PPP_DEFLATE) += ppp_deflate.o
obj-$(CONFIG_PPP_BSDCOMP) += bsd_comp.o
+
+ifeq ($(CONFIG_PPP_MPPE),y)
+ obj-y += $(ppp_mppe_c-objs)
+else
+ ifeq ($(CONFIG_PPP_MPPE),m)
+ obj-m += ppp_mppe_mppc.o
+ endif
+endif
+
obj-$(CONFIG_PPPOE) += pppox.o pppoe.o
obj-$(CONFIG_SLIP) += slip.o
@@ -258,3 +268,5 @@
rcpci.o: $(rcpci-objs)
$(LD) -r -o $@ $(rcpci-objs)
+ppp_mppe_mppc.o: $(ppp_mppe_c-objs)
+ $(LD) -r -o $@ $(ppp_mppe_c-objs)
diff -ruN linux-2.4.21.orig/drivers/net/ppp_generic.c linux-2.4.21/drivers/net/ppp_generic.c
--- linux-2.4.21.orig/drivers/net/ppp_generic.c 2003-06-13 16:51:35.000000000 +0200
+++ linux-2.4.21/drivers/net/ppp_generic.c 2003-07-12 04:39:03.000000000 +0200
@@ -19,7 +19,7 @@
* PPP driver, written by Michael Callahan and Al Longyear, and
* subsequently hacked by Paul Mackerras.
*
- * ==FILEVERSION 20020217==
+ * ==FILEVERSION 20030706==
*/
#include <linux/config.h>
@@ -102,6 +102,7 @@
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 */
@@ -129,6 +130,7 @@
struct sock_fprog pass_filter; /* filter for packets to pass */
struct sock_fprog active_filter;/* filter for pkts to reset idle */
#endif /* CONFIG_PPP_FILTER */
+ int xpad; /* ECP or CCP (MPPE) transmit padding */
};
/*
@@ -552,7 +554,9 @@
case PPPIOCSMRU:
if (get_user(val, (int *) arg))
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;
@@ -1023,14 +1027,35 @@
case PPP_CCP:
/* peek at outbound CCP frames */
ppp_ccp_peek(ppp, skb, 0);
+ /*
+ * When LZS or MPPE/MPPC is negotiated we don't send
+ * CCP_RESETACK after receiving CCP_RESETREQ; in fact pppd
+ * sends such a packet but we silently discard it here
+ */
+ if (CCP_CODE(skb->data+2) == CCP_RESETACK
+ && (ppp->xcomp->compress_proto == CI_MPPE
+ || ppp->xcomp->compress_proto == CI_LZS)) {
+ --ppp->stats.tx_packets;
+ ppp->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 != 0
&& proto != PPP_LCP && proto != PPP_CCP) {
- new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len,
- GFP_ATOMIC);
+ int comp_ovhd = 0;
+ /* because of possible data expansion when MPPC or LZS
+ is used, allocate compressor's buffer about 12.5% bigger
+ than MTU */
+ if (ppp->xcomp->compress_proto == CI_MPPE)
+ comp_ovhd = (((ppp->dev->mtu * 9) / 8) + 1);
+ 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
+ + ppp->xpad + comp_ovhd, GFP_ATOMIC);
if (new_skb == 0) {
printk(KERN_ERR "PPP: no memory (comp pkt)\n");
goto drop;
@@ -1042,15 +1067,28 @@
/* 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);
+ ppp->dev->mtu + ppp->xpad
+ + 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 {
+ } else if (len == 0) {
/* didn't compress, or CCP not up yet */
kfree_skb(new_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.
+ */
+ printk(KERN_ERR "ppp: compressor dropped pkt\n");
+ kfree_skb(new_skb);
+ goto drop;
}
}
@@ -1538,14 +1576,15 @@
int len;
if (proto == PPP_COMP) {
- ns = dev_alloc_skb(ppp->mru + PPP_HDRLEN);
+ ns = dev_alloc_skb(ppp->mru_alloc + PPP_HDRLEN);
if (ns == 0) {
printk(KERN_ERR "ppp_decompress_frame: no memory\n");
goto err;
}
/* the decompressor still expects the A/C bytes in the hdr */
len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2,
- skb->len + 2, ns->data, ppp->mru + PPP_HDRLEN);
+ skb->len + 2, ns->data,
+ ppp->mru_alloc + PPP_HDRLEN);
if (len < 0) {
/* Pass the compressed frame to pppd as an
error indication. */
@@ -1571,7 +1610,12 @@
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;
}
@@ -1980,6 +2024,20 @@
ocomp->comp_free(ostate);
err = 0;
}
+ if (ccp_option[0] == CI_MPPE)
+ /*
+ * pppd (userland) has reduced the MTU by MPPE_PAD,
+ * to accomodate "compressor" growth. We must
+ * increase the space allocated for compressor
+ * output in ppp_send_frame() accordingly. Note
+ * that from a purist's view, it may be more correct
+ * to require multilink and fragment large packets,
+ * but that seems inefficient compared to this
+ * little trick.
+ */
+ ppp->xpad = MPPE_PAD;
+ else
+ ppp->xpad = 0;
} else {
state = cp->decomp_alloc(ccp_option, data.length);
@@ -2251,6 +2309,7 @@
/* Initialize the new ppp unit */
ppp->file.index = unit;
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)
diff -ruN linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.c linux-2.4.21/drivers/net/ppp_mppe_crypto.c
--- linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.21/drivers/net/ppp_mppe_crypto.c 2003-07-08 19:07:18.000000000 +0200
@@ -0,0 +1,257 @@
+/*
+ * ppp_mppe_crypto.c - cryptografic funtions for MPPE
+ *
+ * This code is Public Domain. Please see comments below.
+ *
+ * I have just put SHA1 and ARCFOUR implementations into one file
+ * in order to not pollute kernel namespace.
+ *
+ * Jan Dubiec <jdx@slackware.pl>, 2003-07-08
+ */
+
+/*
+ * ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
+ *
+ * SHA-1 in C
+ * By Steve Reid <steve@edmweb.com>
+ * 100% Public Domain
+ *
+ * Test Vectors (from FIPS PUB 180-1)
+ * "abc"
+ * A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
+ * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
+ * 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
+ * A million repetitions of "a"
+ * 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
+ */
+
+/* #define SHA1HANDSOFF * Copies data before messing with it. */
+
+#if defined(__linux__)
+#include <asm/byteorder.h>
+#include <linux/string.h>
+#elif defined(__solaris__)
+#include <sys/isa_defs.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#define memcpy(d, s, c) bcopy(s, d, c)
+#define memset(d, b, c) bzero(d, c)
+#endif
+
+#include "ppp_mppe_crypto.h"
+
+static void SHA1_Transform(unsigned long[5], const unsigned char[64]);
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+/* blk0() and blk() perform the initial expand. */
+/* I got the idea of expanding during the round function from SSLeay */
+#if defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN)
+#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
+ |(rol(block->l[i],8)&0x00FF00FF))
+#elif defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)
+#define blk0(i) block->l[i]
+#else
+#error Endianness not defined
+#endif
+#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
+ ^block->l[(i+2)&15]^block->l[i&15],1))
+
+/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
+#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
+#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
+#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
+
+/* Hash a single 512-bit block. This is the core of the algorithm. */
+static void
+SHA1_Transform(unsigned long state[5], const unsigned char buffer[64])
+{
+ unsigned long a, b, c, d, e;
+ typedef union {
+ unsigned char c[64];
+ unsigned long l[16];
+ } CHAR64LONG16;
+ CHAR64LONG16 *block;
+
+#ifdef SHA1HANDSOFF
+ static unsigned char workspace[64];
+ block = (CHAR64LONG16 *) workspace;
+ memcpy(block, buffer, 64);
+#else
+ block = (CHAR64LONG16 *) buffer;
+#endif
+ /* Copy context->state[] to working vars */
+ a = state[0];
+ b = state[1];
+ c = state[2];
+ d = state[3];
+ e = state[4];
+ /* 4 rounds of 20 operations each. Loop unrolled. */
+ R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
+ R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
+ R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
+ R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
+ R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
+ R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
+ R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
+ R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
+ R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
+ R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
+ R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
+ R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
+ R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
+ R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
+ R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
+ R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
+ R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
+ R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
+ R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
+ R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
+ /* Add the working vars back into context.state[] */
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+ state[4] += e;
+ /* Wipe variables */
+ a = b = c = d = e = 0;
+}
+
+/* SHA1Init - Initialize new context */
+void
+SHA1_Init(SHA1_CTX *context)
+{
+ /* SHA1 initialization constants */
+ context->state[0] = 0x67452301;
+ context->state[1] = 0xEFCDAB89;
+ context->state[2] = 0x98BADCFE;
+ context->state[3] = 0x10325476;
+ context->state[4] = 0xC3D2E1F0;
+ context->count[0] = context->count[1] = 0;
+}
+
+/* Run your data through this. */
+void
+SHA1_Update(SHA1_CTX *context, const unsigned char *data, unsigned int len)
+{
+ unsigned int i, j;
+
+ j = (context->count[0] >> 3) & 63;
+ if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
+ context->count[1] += (len >> 29);
+ if ((j + len) > 63) {
+ memcpy(&context->buffer[j], data, (i = 64-j));
+ SHA1_Transform(context->state, context->buffer);
+ for ( ; i + 63 < len; i += 64) {
+ SHA1_Transform(context->state, &data[i]);
+ }
+ j = 0;
+ }
+ else
+ i = 0;
+
+ memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+/* Add padding and return the message digest. */
+void
+SHA1_Final(unsigned char digest[20], SHA1_CTX *context)
+{
+ unsigned long i, j;
+ unsigned char finalcount[8];
+
+ for (i = 0; i < 8; i++) {
+ finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
+ >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
+ }
+ SHA1_Update(context, (unsigned char *) "\200", 1);
+ while ((context->count[0] & 504) != 448) {
+ SHA1_Update(context, (unsigned char *) "\0", 1);
+ }
+ SHA1_Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
+ for (i = 0; i < 20; i++) {
+ digest[i] = (unsigned char)
+ ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
+ }
+ /* Wipe variables */
+ i = j = 0;
+ memset(context->buffer, 0, 64);
+ memset(context->state, 0, 20);
+ memset(context->count, 0, 8);
+ memset(&finalcount, 0, 8);
+#ifdef SHA1HANDSOFF /* make SHA1Transform overwrite it's own static vars */
+ SHA1Transform(context->state, context->buffer);
+#endif
+}
+
+/*
+ * arcfour.c
+ * by Frank Cusack <frank@google.com>
+ * 100% public domain
+ *
+ * Implemented from the description in _Applied Cryptography_, 2nd ed.
+ *
+ * ** Distribution ** of this software is unlimited and unrestricted.
+ *
+ * ** Use ** of this software is almost certainly legal; however, refer
+ * to <http://theory.lcs.mit.edu/~rivest/faq.html>.
+ */
+
+#define swap(a, b) \
+{ \
+ unsigned char t = b; \
+ b = a; \
+ a = t; \
+}
+
+/*
+ * Initialize arcfour from a key.
+ */
+void
+arcfour_setkey(arcfour_context *context, const unsigned char *key,
+ unsigned keylen)
+{
+ unsigned i, j;
+ unsigned char K[256];
+
+ context->i = context->j = 0;
+
+ for (i = 0; i < 256; i++) {
+ context->S[i] = i;
+ K[i] = key[i % keylen];
+ }
+
+ j = 0;
+ for (i = 0; i < 256; i++) {
+ j = (j + context->S[i] + K[i]) % 256;
+ swap(context->S[i], context->S[j]);
+ }
+
+ memset(K, 0, sizeof(K));
+}
+
+/*
+ * plaintext -> ciphertext (or vice versa)
+ */
+void
+arcfour_encrypt(arcfour_context *context, const unsigned char *in, unsigned len,
+ unsigned char *out)
+{
+ unsigned i = context->i;
+ unsigned j = context->j;
+ unsigned char *S = context->S;
+ unsigned char K;
+
+ while (len--) {
+ i = (i + 1) % 256;
+ j = (j + S[i]) % 256;
+ swap(S[i], S[j]);
+ K = S[(S[i] + S[j]) % 256];
+ *out++ = *in++ ^ K;
+ }
+
+ context->i = i;
+ context->j = j;
+}
diff -ruN linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.h linux-2.4.21/drivers/net/ppp_mppe_crypto.h
--- linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.21/drivers/net/ppp_mppe_crypto.h 2003-07-08 19:07:25.000000000 +0200
@@ -0,0 +1,40 @@
+/*
+ * ppp_mppe_crypto.h - cryptografic funtion prototypes for MPPE
+ *
+ * This code is Public Domain. Please see comments below.
+ *
+ * I have just put SHA1 and ARCFOUR declarations into one file
+ * in order to not pollute kernel namespace.
+ *
+ * Jan Dubiec <jdx@slackware.pl>, 2003-07-08
+ */
+
+#ifndef _PPP_MPPE_CRYPTO_
+#define _PPP_MPPE_CRYPTO_
+
+/* SHA1 definitions and prototypes */
+typedef struct {
+ unsigned long state[5];
+ unsigned long count[2];
+ unsigned char buffer[64];
+} SHA1_CTX;
+
+#define SHA1_SIGNATURE_SIZE 20
+
+extern void SHA1_Init(SHA1_CTX *);
+extern void SHA1_Update(SHA1_CTX *, const unsigned char *, unsigned int);
+extern void SHA1_Final(unsigned char[SHA1_SIGNATURE_SIZE], SHA1_CTX *);
+
+/* ARCFOUR (aka RC4) definitions and prototypes */
+typedef struct {
+ unsigned i;
+ unsigned j;
+ unsigned char S[256];
+} arcfour_context;
+
+extern void arcfour_setkey(arcfour_context *, const unsigned char *, unsigned);
+extern void arcfour_encrypt(arcfour_context *, const unsigned char *, unsigned,
+ unsigned char *);
+#define arcfour_decrypt arcfour_encrypt
+
+#endif /* _PPP_MPPE_CRYPTO_ */
diff -ruN linux-2.4.21.orig/drivers/net/ppp_mppe_mppc_comp.c linux-2.4.21/drivers/net/ppp_mppe_mppc_comp.c
--- linux-2.4.21.orig/drivers/net/ppp_mppe_mppc_comp.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.21/drivers/net/ppp_mppe_mppc_comp.c 2003-08-07 22:36:59.000000000 +0200
@@ -0,0 +1,1144 @@
+/*
+ * ppp_mppe_mppc_comp.c - MPPC/MPPE "compressor/decompressor" module.
+ *
+ * Copyright (c) 1994 <20>rp<72>d Magos<6F>nyi <mag@bunuel.tii.matav.hu>
+ * Copyright (c) 1999 Tim Hockin, Cobalt Networks Inc. <thockin@cobaltnet.com>
+ * Copyright (c) 2002, 2003 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 <20>rp<72>d Magos<6F>nyi 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.
+ *
+ * Compile command:
+ * gcc -O2 -Wall -I/usr/src/linux/include -D__KERNEL__ -DMODULE -c ppp_mppe_mppc_comp.c
+ *
+ * ==FILEVERSION 20030807==
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+
+#include <linux/ppp_defs.h>
+#include <linux/ppp-comp.h>
+
+#include "ppp_mppe_crypto.h"
+
+/*
+ * State for a mppc/mppe "(de)compressor".
+ */
+struct ppp_mppe_state {
+ arcfour_context arcfour_context;
+ 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_OVHD 2 /* MPPE overhead */
+#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)
+
+/*
+ * Key Derivation, from RFC 3078, RFC 3079.
+ * Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
+ */
+static void
+GetNewKeyFromSHA(unsigned char *MasterKey, unsigned char *SessionKey,
+ unsigned long SessionKeyLength, unsigned char *InterimKey)
+{
+ /*Pads used in key derivation */
+ static unsigned char SHAPad1[40] =
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+ static unsigned char SHAPad2[40] =
+ { 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
+ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
+ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
+ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2 };
+
+ SHA1_CTX Context;
+ unsigned char Digest[SHA1_SIGNATURE_SIZE];
+
+ SHA1_Init(&Context);
+ SHA1_Update(&Context, MasterKey, SessionKeyLength);
+ SHA1_Update(&Context, SHAPad1, sizeof(SHAPad1));
+ SHA1_Update(&Context, SessionKey, SessionKeyLength);
+ SHA1_Update(&Context, SHAPad2, sizeof(SHAPad2));
+ SHA1_Final(Digest,&Context);
+ memcpy(InterimKey, Digest, SessionKeyLength);
+}
+
+static void
+mppe_change_key(struct ppp_mppe_state *state, int initialize)
+{
+ unsigned char InterimKey[MPPE_MAX_KEY_LEN];
+
+ GetNewKeyFromSHA(state->master_key, state->session_key,
+ state->keylen, InterimKey);
+ if (initialize) {
+ memcpy(state->session_key, InterimKey, state->keylen);
+ } else {
+ arcfour_setkey(&state->arcfour_context, InterimKey, state->keylen);
+ arcfour_encrypt(&state->arcfour_context, InterimKey, 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;
+ }
+ }
+ arcfour_setkey(&state->arcfour_context, 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);
+ state->nextflushed = 1;
+ }
+ }
+ }
+}
+
+/* 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;
+ 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;
+ }
+ }
+ }
+
+ MOD_INC_USE_COUNT;
+
+ if (state->mppe) { /* specific for MPPE */
+ 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->hist != NULL)
+ vfree(state->hist);
+ if (state->hash != NULL)
+ vfree(state->hash);
+ kfree(state);
+ }
+ MOD_DEC_USE_COUNT;
+}
+
+/* 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)
+ arcfour_setkey(&state->arcfour_context, 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 max. 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 max. 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 max. 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 just 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 = ((40542*((((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 > 8191 || off < 1 || *p++ != *s++ || *p++ != *s++ || *p++ != *s++)
+ goto literal;
+ 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));
+ }
+ } else {
+ while((*p++ == *s++) && (s < r));
+ }
+ 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;
+ }
+ continue;
+
+ literal:
+ /* 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);
+ }
+ }
+
+ /* 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;
+ 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; /* Leave two octets for MPPE/MPPC bits */
+
+ mppe_increase_ccount(state);
+
+ if (state->nextflushed) {
+ if (!state->stateless) {
+ state->nextflushed = 0;
+ }
+ state->bits |= MPPE_BIT_FLUSHED;
+ 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+2, wptr, isize-2,
+ osize-PPP_HDRLEN-MPPE_OVHD);
+ if ((complen > isize) || (complen == 0)) {
+ /* packet expands */
+ state->nextflushed = 1;
+ memcpy(wptr, ibuf+2, isize-2);
+ olen = isize + (PPP_HDRLEN / 2) + MPPE_OVHD;
+ (state->stats).inc_bytes += olen;
+ (state->stats).inc_packets++;
+ } else {
+ state->bits |= MPPE_BIT_COMP;
+ olen = complen + PPP_HDRLEN + MPPE_OVHD;
+ (state->stats).comp_bytes += olen;
+ (state->stats).comp_packets++;
+ }
+ } else {
+ if (!state->mppc && state->mppe) { /* Do only encryption */
+ /* read from ibuf, write to wptr, adjust for PPP_HDRLEN */
+ arcfour_encrypt(&state->arcfour_context, ibuf+2, isize-2, wptr);
+ state->bits |= MPPE_BIT_ENCRYPTED;
+ olen = isize + (PPP_HDRLEN / 2) + MPPE_OVHD;
+ (state->stats).inc_bytes += olen;
+ (state->stats).inc_packets++;
+ } else { /* Do compression and then encryption - RFC3078 */
+ complen = mppc_compress(state, ibuf+2, wptr, isize-2,
+ osize-PPP_HDRLEN-MPPE_OVHD);
+ if ((complen > isize) || (complen == 0)) {
+ /* packet expands */
+ memcpy(wptr, ibuf+2, isize-2);
+ state->nextflushed = 1;
+ arcfour_encrypt(&state->arcfour_context, ibuf+2, isize-2, wptr);
+ olen = isize + (PPP_HDRLEN / 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. */
+ arcfour_encrypt(&state->arcfour_context, wptr, complen, wptr);
+ olen = complen + PPP_HDRLEN + MPPE_OVHD;
+ (state->stats).comp_bytes += olen;
+ (state->stats).comp_packets++;
+ }
+ state->bits |= MPPE_BIT_ENCRYPTED;
+ }
+ }
+
+ /* 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 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 used to use memmove()
+ * here, because I thought that it acts as libc's version. But
+ * 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;
+ }
+ }
+
+ if (olen <= 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, olen+(PPP_HDRLEN/2));
+ return DECOMP_ERROR;
+ }
+
+ return (int) olen;
+}
+
+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)) {
+ arcfour_setkey(&state->arcfour_context, 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. */
+ arcfour_decrypt(&state->arcfour_context, ibuf+PPP_HDRLEN+MPPE_OVHD,
+ isize-PPP_HDRLEN-MPPE_OVHD, ibuf+PPP_HDRLEN+MPPE_OVHD);
+ uncomplen = mppc_decompress(state, ibuf+PPP_HDRLEN+MPPE_OVHD,
+ obuf, isize-PPP_HDRLEN-MPPE_OVHD,
+ 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 {
+ arcfour_decrypt(&state->arcfour_context, ibuf+PPP_HDRLEN+MPPE_OVHD,
+ isize-PPP_HDRLEN-MPPE_OVHD, obuf);
+ uncomplen = isize - (PPP_HDRLEN / 2) - MPPE_OVHD;
+ (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,
+ obuf, isize-PPP_HDRLEN-MPPE_OVHD,
+ 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,
+ isize-PPP_HDRLEN-MPPE_OVHD);
+ uncomplen = isize - (PPP_HDRLEN / 2) - 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 - no MPPC nor MPPE negotiated\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.
+ */
+struct compressor ppp_mppe = {
+ CI_MPPE, /* compress_proto */
+ mppe_comp_alloc, /* comp_alloc */
+ mppe_comp_free, /* comp_free */
+ mppe_comp_init, /* comp_init */
+ mppe_comp_reset, /* comp_reset */
+ mppe_compress, /* compress */
+ mppe_stats, /* comp_stat */
+ mppe_decomp_alloc, /* decomp_alloc */
+ mppe_comp_free, /* decomp_free */
+ mppe_decomp_init, /* decomp_init */
+ mppe_decomp_reset, /* decomp_reset */
+ mppe_decompress, /* decompress */
+ NULL, /* incomp */
+ mppe_stats, /* decomp_stat */
+};
+
+/*
+ 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.
+*/
+
+/************************************************************
+ * Module support routines
+ ************************************************************/
+
+int __init mppe_module_init(void)
+{
+ int 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)
+{
+ if (MOD_IN_USE) {
+ printk (KERN_INFO "MPPE/MPPC module busy, removing delayed\n");
+ } else {
+ 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_LICENSE("Dual BSD/GPL");
diff -ruN linux-2.4.21.orig/include/linux/ppp-comp.h linux-2.4.21/include/linux/ppp-comp.h
--- linux-2.4.21.orig/include/linux/ppp-comp.h 1999-08-06 19:44:11.000000000 +0200
+++ linux-2.4.21/include/linux/ppp-comp.h 2003-07-15 01:45:22.000000000 +0200
@@ -1,34 +1,42 @@
/*
* ppp-comp.h - Definitions for doing PPP packet compression.
*
- * Copyright (c) 1994 The Australian National University.
- * All rights reserved.
+ * Copyright (c) 1984 Paul Mackerras. All rights reserved.
*
- * 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 Australian National University
- * makes no representations about the suitability of this software for
- * any purpose.
- *
- * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
- * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
- * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
- * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
- * OR MODIFICATIONS.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
*
- * $Id: ppp-comp.h,v 1.6 1997/11/27 06:04:44 paulus Exp $
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * 4. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Paul Mackerras
+ * <paulus@samba.org>".
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * $Id: ppp-comp.h,v 1.10 2002/12/06 09:49:15 paulus Exp $
*/
/*
- * ==FILEVERSION 980319==
+ * ==FILEVERSION 20020715==
*
* NOTE TO MAINTAINERS:
* If you modify this file at all, please set the above date.
@@ -78,7 +86,7 @@
/* 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 +107,7 @@
/* 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);
@@ -187,6 +195,127 @@
#define DEFLATE_CHK_SEQUENCE 0
/*
+ * Definitions for MPPE.
+ */
+
+#define CI_MPPE 18 /* config option for MPPE */
+#define CILEN_MPPE 6 /* length of config option */
+
+#define MPPE_PAD 4 /* MPPE growth per frame */
+#define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */
+
+/* option bits for ccp_options.mppe */
+#define MPPE_OPT_40 0x01 /* 40 bit */
+#define MPPE_OPT_128 0x02 /* 128 bit */
+#define MPPE_OPT_STATEFUL 0x04 /* stateful mode */
+/* unsupported opts */
+#define MPPE_OPT_56 0x08 /* 56 bit */
+#define MPPE_OPT_MPPC 0x10 /* MPPC compression */
+#define MPPE_OPT_D 0x20 /* Unknown */
+#define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D)
+#define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */
+
+/*
+ * This is not nice ... the alternative is a bitfield struct though.
+ * And unfortunately, we cannot share the same bits for the option
+ * names above since C and H are the same bit. We could do a u_int32
+ * but then we have to do a htonl() all the time and/or we still need
+ * to know which octet is which.
+ */
+#define MPPE_C_BIT 0x01 /* MPPC */
+#define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */
+#define MPPE_L_BIT 0x20 /* 40-bit */
+#define MPPE_S_BIT 0x40 /* 128-bit */
+#define MPPE_M_BIT 0x80 /* 56-bit, not supported */
+#define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */
+
+/* Does not include H bit; used for least significant octet only. */
+#define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT)
+
+/* Build a CI from mppe opts (see RFC 3078) */
+#define MPPE_OPTS_TO_CI(opts, ci) \
+ do { \
+ u_char *ptr = ci; /* u_char[4] */ \
+ \
+ /* H bit */ \
+ if (opts & MPPE_OPT_STATEFUL) \
+ *ptr++ = 0x0; \
+ else \
+ *ptr++ = MPPE_H_BIT; \
+ *ptr++ = 0; \
+ *ptr++ = 0; \
+ \
+ /* S,L bits */ \
+ *ptr = 0; \
+ if (opts & MPPE_OPT_128) \
+ *ptr |= MPPE_S_BIT; \
+ if (opts & MPPE_OPT_40) \
+ *ptr |= MPPE_L_BIT; \
+ /* M,D,C bits not supported */ \
+ } while (/* CONSTCOND */ 0)
+
+/* The reverse of the above */
+#define MPPE_CI_TO_OPTS(ci, opts) \
+ do { \
+ u_char *ptr = ci; /* u_char[4] */ \
+ \
+ opts = 0; \
+ \
+ /* H bit */ \
+ if (!(ptr[0] & MPPE_H_BIT)) \
+ opts |= MPPE_OPT_STATEFUL; \
+ \
+ /* S,L bits */ \
+ if (ptr[3] & MPPE_S_BIT) \
+ opts |= MPPE_OPT_128; \
+ if (ptr[3] & MPPE_L_BIT) \
+ opts |= MPPE_OPT_40; \
+ \
+ /* M,D,C bits */ \
+ if (ptr[3] & MPPE_M_BIT) \
+ opts |= MPPE_OPT_56; \
+ if (ptr[3] & MPPE_D_BIT) \
+ opts |= MPPE_OPT_D; \
+ if (ptr[3] & MPPE_C_BIT) \
+ opts |= MPPE_OPT_MPPC; \
+ \
+ /* Other bits */ \
+ if (ptr[0] & ~MPPE_H_BIT) \
+ opts |= MPPE_OPT_UNKNOWN; \
+ if (ptr[1] || ptr[2]) \
+ opts |= MPPE_OPT_UNKNOWN; \
+ if (ptr[3] & ~MPPE_ALL_BITS) \
+ opts |= MPPE_OPT_UNKNOWN; \
+ } while (/* CONSTCOND */ 0)
+
+/* MPPE/MPPC definitions by J.D.*/
+#define MPPE_STATELESS MPPE_H_BIT /* configuration bit H */
+#define MPPE_40BIT MPPE_L_BIT /* configuration bit L */
+#define MPPE_56BIT MPPE_M_BIT /* configuration bit M */
+#define MPPE_128BIT MPPE_S_BIT /* configuration bit S */
+#define MPPE_MPPC MPPE_C_BIT /* 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.
*/
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