2000-11-25 Antti P Miettinen <antti.p.miettinen@nokia.com>

	* wrapup/Makefile.am: Added modem subdir.
	* configure.in, Makefile.am: Added modem subdir.
	* net/Makefile.am: Added if_pppvar.h, pppcompress.h.
	* pppd/Makefile.am: Added pppmain.c (which needs work).
	* pppd/chat.c, pppd/fsm.c, pppd/fsm.h, pppd/ipxcp.c, pppd/main.c,
	pppd/ppp_tty.c, pppd/upap.c: Changes from Thomas Doerfler
	<Thomas.Doerfler@imd-systems.de> and cosmetic changes by me.
	Actually main.c and ppp_tty.c should be scratched. The modem
	subdir has the real ppp_tty.c and the real pppd main is in pppmain.c.

1 files changed, 164 insertions, 0 deletions

diff --git a/cpukit/libnetworking/net/pppcompress.h b/cpukit/libnetworking/net/pppcompress.h
new file mode 100644
index 0000000000..3f7687e6bb
--- /dev/null
+++ b/cpukit/libnetworking/net/pppcompress.h
@@ -0,0 +1,164 @@
+/*
+ * Definitions for tcp compression routines.
+ *
+ * Copyright (c) 1989 Regents of the University of California.
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
+ *	- Initial distribution.
+ *
+ *	From: 	slcompress.h	7.4	90/06/28
+ *	$Id$
+ */
+
+#ifndef _NET_PPPCOMPRESS_H_
+#define _NET_PPPCOMPRESS_H_
+
+#define MAX_STATES 16		/* must be > 2 and < 256 */
+#define MAX_HDR MLEN		/* XXX 4bsd-ism: should really be 128 */
+
+/*
+ * Compressed packet format:
+ *
+ * The first octet contains the packet type (top 3 bits), TCP
+ * 'push' bit, and flags that indicate which of the 4 TCP sequence
+ * numbers have changed (bottom 5 bits).  The next octet is a
+ * conversation number that associates a saved IP/TCP header with
+ * the compressed packet.  The next two octets are the TCP checksum
+ * from the original datagram.  The next 0 to 15 octets are
+ * sequence number changes, one change per bit set in the header
+ * (there may be no changes and there are two special cases where
+ * the receiver implicitly knows what changed -- see below).
+ * 
+ * There are 5 numbers which can change (they are always inserted
+ * in the following order): TCP urgent pointer, window,
+ * acknowlegement, sequence number and IP ID.  (The urgent pointer
+ * is different from the others in that its value is sent, not the
+ * change in value.)  Since typical use of SLIP links is biased
+ * toward small packets (see comments on MTU/MSS below), changes
+ * use a variable length coding with one octet for numbers in the
+ * range 1 - 255 and 3 octets (0, MSB, LSB) for numbers in the
+ * range 256 - 65535 or 0.  (If the change in sequence number or
+ * ack is more than 65535, an uncompressed packet is sent.)
+ */
+
+/*
+ * Packet types (must not conflict with IP protocol version)
+ *
+ * The top nibble of the first octet is the packet type.  There are
+ * three possible types: IP (not proto TCP or tcp with one of the
+ * control flags set); uncompressed TCP (a normal IP/TCP packet but
+ * with the 8-bit protocol field replaced by an 8-bit connection id --
+ * this type of packet syncs the sender & receiver); and compressed
+ * TCP (described above).
+ *
+ * LSB of 4-bit field is TCP "PUSH" bit (a worthless anachronism) and
+ * is logically part of the 4-bit "changes" field that follows.  Top
+ * three bits are actual packet type.  For backward compatibility
+ * and in the interest of conserving bits, numbers are chosen so the
+ * IP protocol version number (4) which normally appears in this nibble
+ * means "IP packet".
+ */
+
+/* packet types */
+#define TYPE_IP 0x40
+#define TYPE_UNCOMPRESSED_TCP 0x70
+#define TYPE_COMPRESSED_TCP 0x80
+#define TYPE_ERROR 0x00
+
+/* Bits in first octet of compressed packet */
+#define NEW_C	0x40	/* flag bits for what changed in a packet */
+#define NEW_I	0x20
+#define NEW_S	0x08
+#define NEW_A	0x04
+#define NEW_W	0x02
+#define NEW_U	0x01
+
+/* reserved, special-case values of above */
+#define SPECIAL_I (NEW_S|NEW_W|NEW_U)		/* echoed interactive traffic */
+#define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U)	/* unidirectional data */
+#define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U)
+
+#define TCP_PUSH_BIT 0x10
+
+
+/*
+ * "state" data for each active tcp conversation on the wire.  This is
+ * basically a copy of the entire IP/TCP header from the last packet
+ * we saw from the conversation together with a small identifier
+ * the transmit & receive ends of the line use to locate saved header.
+ */
+struct cstate {
+	struct cstate *cs_next;	/* next most recently used cstate (xmit only) */
+	u_short cs_hlen;	/* size of hdr (receive only) */
+	u_char cs_id;		/* connection # associated with this state */
+	u_char cs_filler;
+	union {
+		char csu_hdr[MAX_HDR];
+		struct ip csu_ip;	/* ip/tcp hdr from most recent packet */
+	} slcs_u;
+};
+#define cs_ip slcs_u.csu_ip
+#define cs_hdr slcs_u.csu_hdr
+
+/*
+ * all the state data for one serial line (we need one of these
+ * per line).
+ */
+struct vjcompress {
+	struct cstate *last_cs;	/* most recently used tstate */
+	u_char last_recv;	/* last rcvd conn. id */
+	u_char last_xmit;	/* last sent conn. id */
+	u_short flags;
+#ifndef SL_NO_STATS
+	int sls_packets;	/* outbound packets */
+	int sls_compressed;	/* outbound compressed packets */
+	int sls_searches;	/* searches for connection state */
+	int sls_misses;		/* times couldn't find conn. state */
+	int sls_uncompressedin;	/* inbound uncompressed packets */
+	int sls_compressedin;	/* inbound compressed packets */
+	int sls_errorin;	/* inbound unknown type packets */
+	int sls_tossed;		/* inbound packets tossed because of error */
+#endif
+	struct cstate tstate[MAX_STATES];	/* xmit connection states */
+	struct cstate rstate[MAX_STATES];	/* receive connection states */
+};
+/* flag values */
+#define SLF_TOSS 1		/* tossing rcvd frames because of input err */
+
+void	 vj_compress_init __P((struct vjcompress *, int));
+u_int	 vj_compress_tcp __P((struct mbuf *,
+	    struct ip *, struct vjcompress *, int));
+int	 vj_uncompress_tcp __P((u_char **, int, u_int, struct vjcompress *));
+int	 vj_uncompress_tcp_core __P((u_char *, int, int, u_int,
+	    struct vjcompress *, u_char **, u_int *));
+
+#endif /* _NET_PPPCOMPRESS_H_ */