X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=pppd%2Fmppe.h;fp=pppd%2Fmppe.h;h=5eb3b37a99d65966e0ead25e9265a7db7f11a2bc;hb=6117748f5e7872c78d32c18e68b5fb7ce3f78670;hp=0000000000000000000000000000000000000000;hpb=5dce043b4b7e32d41598442361736a927a5db5e4;p=ppp.git

diff --git a/pppd/mppe.h b/pppd/mppe.h
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+++ b/pppd/mppe.h
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+/*
+ * mppe.h - Definitions for MPPE
+ *
+ * Copyright (c) 2008 Paul Mackerras. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 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.
+ */
+
+#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)