gvpe/src/connection.h

/*
    connection.h -- header for connection.C
    Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
 
    This file is part of GVPE.

    GVPE is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    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 gvpe; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef VPE_CONNECTION_H__
#define VPE_CONNECTION_H__

#include <openssl/hmac.h>

#include "global.h"
#include "conf.h"
#include "sockinfo.h"
#include "util.h"
#include "device.h"

struct vpn;

// called after HUP etc. to (re-)initialize global data structures
void connection_init ();

struct rsaid {
  u8 id[RSA_IDLEN]; // the challenge id
};

typedef rsaclear rsachallenge;      // challenge data;
typedef rsacrypt rsaencrdata;       // encrypted challenge
typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash

////////////////////////////////////////////////////////////////////////////////////////

struct crypto_ctx;

struct hmac_packet : net_packet
{
  u8 hmac[HMACLENGTH];          // each and every packet has a hmac field, but that is not (yet) checked everywhere

  void hmac_set (crypto_ctx * ctx);
  bool hmac_chk (crypto_ctx * ctx);

private:
  static unsigned char hmac_digest[EVP_MAX_MD_SIZE];

  void hmac_gen (crypto_ctx * ctx);
};

struct vpn_packet : hmac_packet
  {
    enum ptype
    {
      PT_RESET = 0,
      PT_DATA_UNCOMPRESSED,
      PT_DATA_COMPRESSED,
      PT_PING, PT_PONG, // wasting namespace space? ;)
      PT_AUTH_REQ,      // authentification request
      PT_AUTH_RES,      // authentification response
      PT_CONNECT_REQ,   // want other host to contact me
      PT_CONNECT_INFO,  // request connection to some node
      PT_MAX
    };

    u8 type;
    u8 srcdst, src1, dst1;

    void set_hdr (ptype type_, unsigned int dst);

    unsigned int src () const
    {
      return src1 | ((srcdst >> 4) << 8);
    }

    unsigned int dst () const
    {
      return dst1 | ((srcdst & 0xf) << 8);
    }

    ptype typ () const
    {
      return (ptype) type;
    }
  };

////////////////////////////////////////////////////////////////////////////////////////

// a very simple fifo pkt-queue
class pkt_queue
  {
    net_packet *queue[QUEUEDEPTH];
    int i, j;

  public:

    void put (net_packet *p);
    net_packet *get ();

    pkt_queue ();
    ~pkt_queue ();
  };

enum
  {
    FEATURE_COMPRESSION = 0x01,
    FEATURE_ROHC        = 0x02,
  };

struct connection
  {
    conf_node *conf;
    struct vpn *vpn;

    sockinfo si; // the current(!) destination ip to send packets to
    int retry_cnt;

    tstamp last_activity;       // time of last packet received

    u32 oseqno;
    sliding_window iseqno;

    u8 protocol;
    u8 features;

    pkt_queue data_queue, vpn_queue;

    crypto_ctx *octx, *ictx;

#if ENABLE_DNS
    struct dns_connection *dns;

    bool send_dnsv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);
    void dnsv4_reset_connection ();
#endif

    enum conf_node::connectmode connectmode;
    u8 prot_minor; // minor number of other side

    void reset_si ();
    const sockinfo &forward_si (const sockinfo &si) const;

    void shutdown ();
    void connection_established ();
    void reset_connection ();

    void establish_connection_cb (time_watcher &w); time_watcher establish_connection;
    void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing)
    void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe

    void send_connect_request (int id);
    void send_auth_request (const sockinfo &si, bool initiate);
    void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
    void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
    void send_reset (const sockinfo &dsi);
    void send_ping (const sockinfo &dsi, u8 pong = 0);
    void send_data_packet (tap_packet *pkt);

    void inject_data_packet (tap_packet *pkt, bool broadcast = false);
    void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding

    void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
    void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);

    void script_node ();
    const char *script_node_up ();
    const char *script_node_down ();

    void dump_status ();

    connection (struct vpn *vpn, conf_node *conf);
    ~connection ();
  };

#endif

Revision:	1.20
Committed:	Fri Mar 4 09:36:45 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+1 -0 lines
Log Message:	* empty log message *
#	Content
1	/*
2	connection.h -- header for connection.C
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4
5	This file is part of GVPE.
6
7	GVPE is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 2 of the License, or
10	(at your option) any later version.
11
12	This program is distributed in the hope that it will be useful,
13	but WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	GNU General Public License for more details.
16
17	You should have received a copy of the GNU General Public License
18	along with gvpe; if not, write to the Free Software
19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20	*/
21
22	#ifndef VPE_CONNECTION_H__
23	#define VPE_CONNECTION_H__
24
25	#include <openssl/hmac.h>
26
27	#include "global.h"
28	#include "conf.h"
29	#include "sockinfo.h"
30	#include "util.h"
31	#include "device.h"
32
33	struct vpn;
34
35	// called after HUP etc. to (re-)initialize global data structures
36	void connection_init ();
37
38	struct rsaid {
39	u8 id[RSA_IDLEN]; // the challenge id
40	};
41
42	typedef rsaclear rsachallenge; // challenge data;
43	typedef rsacrypt rsaencrdata; // encrypted challenge
44	typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
45
46	////////////////////////////////////////////////////////////////////////////////////////
47
48	struct crypto_ctx;
49
50	struct hmac_packet : net_packet
51	{
52	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
53
54	void hmac_set (crypto_ctx * ctx);
55	bool hmac_chk (crypto_ctx * ctx);
56
57	private:
58	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
59
60	void hmac_gen (crypto_ctx * ctx);
61	};
62
63	struct vpn_packet : hmac_packet
64	{
65	enum ptype
66	{
67	PT_RESET = 0,
68	PT_DATA_UNCOMPRESSED,
69	PT_DATA_COMPRESSED,
70	PT_PING, PT_PONG, // wasting namespace space? ;)
71	PT_AUTH_REQ, // authentification request
72	PT_AUTH_RES, // authentification response
73	PT_CONNECT_REQ, // want other host to contact me
74	PT_CONNECT_INFO, // request connection to some node
75	PT_MAX
76	};
77
78	u8 type;
79	u8 srcdst, src1, dst1;
80
81	void set_hdr (ptype type_, unsigned int dst);
82
83	unsigned int src () const
84	{
85	return src1 \| ((srcdst >> 4) << 8);
86	}
87
88	unsigned int dst () const
89	{
90	return dst1 \| ((srcdst & 0xf) << 8);
91	}
92
93	ptype typ () const
94	{
95	return (ptype) type;
96	}
97	};
98
99	////////////////////////////////////////////////////////////////////////////////////////
100
101	// a very simple fifo pkt-queue
102	class pkt_queue
103	{
104	net_packet *queue[QUEUEDEPTH];
105	int i, j;
106
107	public:
108
109	void put (net_packet *p);
110	net_packet *get ();
111
112	pkt_queue ();
113	~pkt_queue ();
114	};
115
116	enum
117	{
118	FEATURE_COMPRESSION = 0x01,
119	FEATURE_ROHC = 0x02,
120	};
121
122	struct connection
123	{
124	conf_node *conf;
125	struct vpn *vpn;
126
127	sockinfo si; // the current(!) destination ip to send packets to
128	int retry_cnt;
129
130	tstamp last_activity; // time of last packet received
131
132	u32 oseqno;
133	sliding_window iseqno;
134
135	u8 protocol;
136	u8 features;
137
138	pkt_queue data_queue, vpn_queue;
139
140	crypto_ctx octx, ictx;
141
142	#if ENABLE_DNS
143	struct dns_connection *dns;
144
145	bool send_dnsv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);
146	void dnsv4_reset_connection ();
147	#endif
148
149	enum conf_node::connectmode connectmode;
150	u8 prot_minor; // minor number of other side
151
152	void reset_si ();
153	const sockinfo &forward_si (const sockinfo &si) const;
154
155	void shutdown ();
156	void connection_established ();
157	void reset_connection ();
158
159	void establish_connection_cb (time_watcher &w); time_watcher establish_connection;
160	void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing)
161	void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe
162
163	void send_connect_request (int id);
164	void send_auth_request (const sockinfo &si, bool initiate);
165	void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
166	void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
167	void send_reset (const sockinfo &dsi);
168	void send_ping (const sockinfo &dsi, u8 pong = 0);
169	void send_data_packet (tap_packet *pkt);
170
171	void inject_data_packet (tap_packet *pkt, bool broadcast = false);
172	void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding
173
174	void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
175	void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
176
177	void script_node ();
178	const char *script_node_up ();
179	const char *script_node_down ();
180
181	void dump_status ();
182
183	connection (struct vpn vpn, conf_node conf);
184	~connection ();
185	};
186
187	#endif
188