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. 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef GVPE_CONNECTION_H__
#define GVPE_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 node to contact me
    PT_CONNECT_INFO,    // request connection to some node
    PT_DATA_BRIDGED,  // uncompressed packet with foreign mac pot. larger than path mtu
    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
{
  int i, j;
  int max_queue;
  double max_ttl;

  struct pkt {
    ev_tstamp tstamp;
    net_packet *pkt;
  } *queue;

  void expire_cb (ev::timer &w, int revents); ev::timer expire;

public:

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

  bool empty ()
  {
    return i == j;
  }

  pkt_queue (double max_ttl, int max_queue);
  ~pkt_queue ();
};

enum
{
  FEATURE_COMPRESSION = 0x01,
  FEATURE_ROHC        = 0x02,
  FEATURE_BRIDGING    = 0x04,
};

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;

  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 (ev::timer &w, int revents); ev::timer establish_connection;
  void rekey_cb (ev::timer &w, int revents); ev::timer rekey; // next rekying (actually current reset + reestablishing)
  void keepalive_cb (ev::timer &w, int revents); ev::timer 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 recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
  void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);

  void script_init_env (const char *ext);
  void script_init_connect_env ();
  const char *script_node_up ();
  const char *script_node_down ();

  void dump_status ();

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

#endif

Revision:	1.30
Committed:	Thu Aug 7 16:34:21 2008 UTC (15 years, 9 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.29:	+15 -2 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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	*/
21
22	#ifndef GVPE_CONNECTION_H__
23	#define GVPE_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	{
40	u8 id[RSA_IDLEN]; // the challenge id
41	};
42
43	typedef rsaclear rsachallenge; // challenge data;
44	typedef rsacrypt rsaencrdata; // encrypted challenge
45	typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
46
47	////////////////////////////////////////////////////////////////////////////////////////
48
49	struct crypto_ctx;
50
51	struct hmac_packet : net_packet
52	{
53	u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
54
55	void hmac_set (crypto_ctx * ctx);
56	bool hmac_chk (crypto_ctx * ctx);
57
58	private:
59	static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
60
61	void hmac_gen (crypto_ctx * ctx);
62	};
63
64	struct vpn_packet : hmac_packet
65	{
66	enum ptype
67	{
68	PT_RESET = 0,
69	PT_DATA_UNCOMPRESSED,
70	PT_DATA_COMPRESSED,
71	PT_PING, PT_PONG, // wasting namespace space? ;)
72	PT_AUTH_REQ, // authentification request
73	PT_AUTH_RES, // authentification response
74	PT_CONNECT_REQ, // want other node to contact me
75	PT_CONNECT_INFO, // request connection to some node
76	PT_DATA_BRIDGED, // uncompressed packet with foreign mac pot. larger than path mtu
77	PT_MAX
78	};
79
80	u8 type;
81	u8 srcdst, src1, dst1;
82
83	void set_hdr (ptype type_, unsigned int dst);
84
85	unsigned int src () const
86	{
87	return src1 \| ((srcdst >> 4) << 8);
88	}
89
90	unsigned int dst () const
91	{
92	return dst1 \| ((srcdst & 0xf) << 8);
93	}
94
95	ptype typ () const
96	{
97	return (ptype) type;
98	}
99	};
100
101	////////////////////////////////////////////////////////////////////////////////////////
102
103	// a very simple fifo pkt-queue
104	class pkt_queue
105	{
106	int i, j;
107	int max_queue;
108	double max_ttl;
109
110	struct pkt {
111	ev_tstamp tstamp;
112	net_packet *pkt;
113	} *queue;
114
115	void expire_cb (ev::timer &w, int revents); ev::timer expire;
116
117	public:
118
119	void put (net_packet *p);
120	net_packet *get ();
121
122	bool empty ()
123	{
124	return i == j;
125	}
126
127	pkt_queue (double max_ttl, int max_queue);
128	~pkt_queue ();
129	};
130
131	enum
132	{
133	FEATURE_COMPRESSION = 0x01,
134	FEATURE_ROHC = 0x02,
135	FEATURE_BRIDGING = 0x04,
136	};
137
138	struct connection
139	{
140	conf_node *conf;
141	struct vpn *vpn;
142
143	sockinfo si; // the current(!) destination ip to send packets to
144	int retry_cnt;
145
146	tstamp last_activity; // time of last packet received
147
148	u32 oseqno;
149	sliding_window iseqno;
150
151	u8 protocol;
152	u8 features;
153
154	pkt_queue data_queue, vpn_queue;
155
156	crypto_ctx octx, ictx;
157
158	#if ENABLE_DNS
159	struct dns_connection *dns;
160
161	void dnsv4_reset_connection ();
162	#endif
163
164	enum conf_node::connectmode connectmode;
165	u8 prot_minor; // minor number of other side
166
167	void reset_si ();
168	const sockinfo &forward_si (const sockinfo &si) const;
169
170	void shutdown ();
171	void connection_established ();
172	void reset_connection ();
173
174	void establish_connection_cb (ev::timer &w, int revents); ev::timer establish_connection;
175	void rekey_cb (ev::timer &w, int revents); ev::timer rekey; // next rekying (actually current reset + reestablishing)
176	void keepalive_cb (ev::timer &w, int revents); ev::timer keepalive; // next keepalive probe
177
178	void send_connect_request (int id);
179	void send_auth_request (const sockinfo &si, bool initiate);
180	void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
181	void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
182	void send_reset (const sockinfo &dsi);
183	void send_ping (const sockinfo &dsi, u8 pong = 0);
184	void send_data_packet (tap_packet *pkt);
185
186	void inject_data_packet (tap_packet *pkt, bool broadcast = false);
187	void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding
188
189	void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
190	void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
191
192	void script_init_env (const char *ext);
193	void script_init_connect_env ();
194	const char *script_node_up ();
195	const char *script_node_down ();
196
197	void dump_status ();
198
199	connection (struct vpn vpn, conf_node conf);
200	~connection ();
201	};
202
203	#endif
204