gvpe/src/connection.h

/*
    connection.h -- header for connection.C
 
    This program 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 this program; 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 <netinet/ip.h> // for tos etc.

#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 u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
typedef u8 rsaencrdata[RSA_KEYLEN]; // 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
  {
    tap_packet *queue[QUEUEDEPTH];
    int i, j;

  public:

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

    pkt_queue ();
    ~pkt_queue ();
  };

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;

    pkt_queue queue;

    crypto_ctx *octx, *ictx;

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

    void reset_dstaddr ();

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

    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, bool broadcast = false);
    void inject_data_packet (tap_packet *pkt, bool broadcast = false);
    void connect_request (int id);

    void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
    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_);
    ~connection ();
  };

#endif

Revision:	1.3
Committed:	Wed Apr 2 05:15:00 2003 UTC (21 years, 1 month ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+2 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			connection.h -- header for connection.C
3
4			This program is free software; you can redistribute it and/or modify
5			it under the terms of the GNU General Public License as published by
6			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
8
9			This program is distributed in the hope that it will be useful,
10			but WITHOUT ANY WARRANTY; without even the implied warranty of
11			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12			GNU General Public License for more details.
13
14			You should have received a copy of the GNU General Public License
15			along with this program; if not, write to the Free Software
16			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17			*/
18
19			#ifndef VPE_CONNECTION_H__
20			#define VPE_CONNECTION_H__
21
22			#include <netinet/ip.h> // for tos etc.
23
24			#include <openssl/hmac.h>
25
26			#include "global.h"
27			#include "conf.h"
28			#include "sockinfo.h"
29			#include "util.h"
30			#include "device.h"
31
32			struct vpn;
33
34			// called after HUP etc. to (re-)initialize global data structures
35			void connection_init ();
36
37			struct rsaid {
38			u8 id[RSA_IDLEN]; // the challenge id
39			};
40
41			typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
42			typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
43			typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
44
45			////////////////////////////////////////////////////////////////////////////////////////
46
47			struct crypto_ctx;
48
49			struct hmac_packet:net_packet
50			{
51			u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
52
53			void hmac_set (crypto_ctx * ctx);
54			bool hmac_chk (crypto_ctx * ctx);
55
56			private:
57			static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
58
59			void hmac_gen (crypto_ctx * ctx);
60			};
61
62			struct vpn_packet : hmac_packet
63			{
64			enum ptype
65			{
66			PT_RESET = 0,
67			PT_DATA_UNCOMPRESSED,
68			PT_DATA_COMPRESSED,
69			PT_PING, PT_PONG, // wasting namespace space? ;)
70			PT_AUTH_REQ, // authentification request
71			PT_AUTH_RES, // authentification response
72			PT_CONNECT_REQ, // want other host to contact me
73			PT_CONNECT_INFO, // request connection to some node
74			PT_MAX
75			};
76
77			u8 type;
78			u8 srcdst, src1, dst1;
79
80			void set_hdr (ptype type, unsigned int dst);
81
82			unsigned int src () const
83			{
84			return src1 \| ((srcdst >> 4) << 8);
85			}
86
87			unsigned int dst () const
88			{
89			return dst1 \| ((srcdst & 0xf) << 8);
90			}
91
92			ptype typ () const
93			{
94			return (ptype) type;
95			}
96			};
97
98			////////////////////////////////////////////////////////////////////////////////////////
99
100			// a very simple fifo pkt-queue
101			class pkt_queue
102			{
103			tap_packet *queue[QUEUEDEPTH];
104			int i, j;
105
106			public:
107
108			void put (tap_packet *p);
109			tap_packet *get ();
110
111			pkt_queue ();
112			~pkt_queue ();
113			};
114
115			struct connection
116			{
117			conf_node *conf;
118			struct vpn *vpn;
119
120			sockinfo si; // the current(!) destination ip to send packets to
121			int retry_cnt;
122
123			tstamp last_activity; // time of last packet received
124
125			u32 oseqno;
126			sliding_window iseqno;
127
128			u8 protocol;
129
130			pkt_queue queue;
131
132			crypto_ctx octx, ictx;
133
134			enum conf_node::connectmode connectmode;
135			u8 prot_minor; // minor number of other side
136
137			void reset_dstaddr ();
138
139			void shutdown ();
140			void reset_connection ();
141			void establish_connection_cb (tstamp &ts); time_watcher establish_connection;
142			void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing)
143			void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe
144
145			void send_auth_request (const sockinfo &si, bool initiate);
146			void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
147			void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
148			void send_reset (const sockinfo &dsi);
149			void send_ping (const sockinfo &dsi, u8 pong = 0);
150			void send_data_packet (tap_packet *pkt, bool broadcast = false);
151			void inject_data_packet (tap_packet *pkt, bool broadcast = false);
152			void connect_request (int id);
153
154			void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
155			void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
156
157			void script_node ();
158	pcg	1.3	const char *script_node_up ();
159			const char *script_node_down ();
160	pcg	1.1
161			void dump_status ();
162
163			connection(struct vpn *vpn_);
164			~connection ();
165			};
166
167			#endif
168