Generic PPP control protocol support

Implement a generic protocol that can be shared by both the LCP and the
NCP implementation.

Makefile.am

@@ -57,7 +57,8 @@ gatchat_sources = gatchat/gatchat.h gatchat/gatchat.c \
 				gatchat/gat.h \
 				gatchat/gatserver.h gatchat/gatserver.c \
 				gatchat/gatppp.c gatchat/gatppp.h \
-				gatchat/ppp.c gatchat/ppp.h
+				gatchat/ppp.c gatchat/ppp.h gatchat/ppp_cp.h \
+				gatchat/ppp_cp.c
 
 udev_files = plugins/ofono.rules
 

gatchat/ppp.h

@@ -18,6 +18,8 @@
  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */
+#include "ppp_cp.h"
+
 #define DEFAULT_MRU	1500
 #define BUFFERSZ	DEFAULT_MRU*2
 #define DEFAULT_ACCM	0x00000000

gatchat/ppp_cp.h

@@ -0,0 +1,139 @@
+/*
+ *
+ *  PPP library with GLib integration
+ *
+ *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+struct pppcp_data;
+
+enum pppcp_code {
+	CONFIGURE_REQUEST = 1,
+	CONFIGURE_ACK,
+	CONFIGURE_NAK,
+	CONFIGURE_REJECT,
+	TERMINATE_REQUEST,
+	TERMINATE_ACK,
+	CODE_REJECT,
+	PROTOCOL_REJECT,
+	ECHO_REQUEST,
+	ECHO_REPLY,
+	DISCARD_REQUEST
+};
+
+enum pppcp_event_type {
+	UP,
+	DOWN,
+	OPEN,
+	CLOSE,
+	TO_PLUS,
+	TO_MINUS,
+	RCR_PLUS,
+	RCR_MINUS,
+	RCA,
+	RCN,
+	RTR,
+	RTA,
+	RUC,
+	RXJ_PLUS,
+	RXJ_MINUS,
+	RXR,
+};
+
+enum pppcp_state {
+	INITIAL,
+	STARTING,
+	CLOSED,
+	STOPPED,
+	CLOSING,
+	STOPPING,
+	REQSENT,
+	ACKRCVD,
+	ACKSENT,
+	OPENED,
+};
+
+/* option format */
+struct ppp_option {
+	guint8 type;
+	guint8 length;
+	guint8 data[0];
+};
+
+enum option_rval {
+	OPTION_ACCEPT,
+	OPTION_REJECT,
+	OPTION_NAK,
+	OPTION_ERR,
+};
+
+struct pppcp_action {
+	void (*this_layer_up)(struct pppcp_data *data);
+	void (*this_layer_down)(struct pppcp_data *data);
+	void (*this_layer_started)(struct pppcp_data *data);
+	void (*this_layer_finished)(struct pppcp_data *data);
+	enum option_rval (*option_scan)(struct ppp_option *option,
+						gpointer user_data);
+	void (*option_process)(gpointer option, gpointer user_data);
+};
+
+struct pppcp_packet {
+	guint8 code;
+	guint8 identifier;
+	guint16 length;
+	guint8 data[0];
+} __attribute__((packed));
+
+struct pppcp_data {
+	enum pppcp_state state;
+	guint restart_timer;
+	guint restart_counter;
+	guint restart_interval;
+	guint max_terminate;
+	guint max_configure;
+	guint max_failure;
+	guint32 magic_number;
+	GQueue *event_queue;
+	GList *config_options;
+	GList *acceptable_options;
+	GList *unacceptable_options;
+	GList *rejected_options;
+	GList *applied_options;
+	GAtPPP *ppp;
+	guint8 identifier;  /* don't think I need this now */
+	guint8 config_identifier;
+	guint8 terminate_identifier;
+	guint8 reject_identifier;
+	struct pppcp_action *action;
+	guint16 valid_codes;
+	guint8 (*packet_ops[11])(struct pppcp_data *data,
+					struct pppcp_packet *packet);
+	void (*event_ops[16])(struct pppcp_data *data, guint8 *packet,
+				guint length);
+	gpointer priv;
+	guint16 proto;
+};
+
+struct pppcp_data *pppcp_new(GAtPPP *ppp, guint16 proto, gpointer priv);
+void pppcp_free(struct pppcp_data *data);
+void pppcp_add_config_option(struct pppcp_data *data,
+				struct ppp_option *option);
+void pppcp_set_valid_codes(struct pppcp_data *data, guint16 codes);
+void pppcp_generate_event(struct pppcp_data *data,
+				enum pppcp_event_type event_type,
+				gpointer event_data, guint data_len);
+void pppcp_process_packet(gpointer priv, guint8 *new_packet);