gvpe/src/protocol.h

/*
    protocol.h -- header for protocol.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_PROTOCOL_H__
#define VPE_PROTOCOL_H__

#include <netinet/in.h>
#include <netinet/ip.h> // for tos etc.

#include <openssl/evp.h>
#include <openssl/rsa.h>

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

/* Protocol version. Different major versions are incompatible,
 * different minor versions probably are compatible ;)
 */

#define PROTOCOL_MAJOR 0
#define PROTOCOL_MINOR 0

struct vpn;
struct vpn_packet;

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;

// 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 (int);
    const char *script_node_down (int);

    void dump_status ();

    connection(struct vpn *vpn_);
    ~connection ();
  };

struct vpn
  {
    int udpv4_fd;
    int ipv4_fd;

    int events;

    enum {
      EVENT_RECONNECT = 1,
      EVENT_SHUTDOWN  = 2,
    };

    void event_cb (tstamp &ts); time_watcher event;

    tap_device *tap;

    typedef vector<connection *> conns_vector;
    conns_vector conns;

    connection *find_router ();

    void reconnect_all ();
    void shutdown_all ();
    void connect_request (int id);

    void tap_ev (short revents); io_watcher tap_ev_watcher;
    void ipv4_ev (short revents); io_watcher ipv4_ev_watcher;
    void udpv4_ev (short revents); io_watcher udpv4_ev_watcher;

    void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);

    void send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
    void send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);

    vpn ();
    ~vpn ();

    int setup ();

    void dump_status ();

    const char *script_if_up (int);
  };

#endif

Revision:	1.12
Committed:	Fri Mar 28 16:21:09 2003 UTC (21 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.11:	+1 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	protocol.h -- header for protocol.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_PROTOCOL_H__
20	#define VPE_PROTOCOL_H__
21
22	#include <netinet/in.h>
23	#include <netinet/ip.h> // for tos etc.
24
25	#include <openssl/evp.h>
26	#include <openssl/rsa.h>
27
28	#include "conf.h"
29	#include "iom.h"
30	#include "util.h"
31	#include "sockinfo.h"
32	#include "device.h"
33
34	/* Protocol version. Different major versions are incompatible,
35	* different minor versions probably are compatible ;)
36	*/
37
38	#define PROTOCOL_MAJOR 0
39	#define PROTOCOL_MINOR 0
40
41	struct vpn;
42	struct vpn_packet;
43
44	struct rsaid {
45	u8 id[RSA_IDLEN]; // the challenge id
46	};
47
48	typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
49	typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
50	typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
51
52	struct crypto_ctx;
53
54	// a very simple fifo pkt-queue
55	class pkt_queue
56	{
57	tap_packet *queue[QUEUEDEPTH];
58	int i, j;
59
60	public:
61
62	void put (tap_packet *p);
63	tap_packet *get ();
64
65	pkt_queue ();
66	~pkt_queue ();
67	};
68
69	struct connection
70	{
71	conf_node *conf;
72	struct vpn *vpn;
73
74	sockinfo si; // the current(!) destination ip to send packets to
75	int retry_cnt;
76
77	tstamp last_activity; // time of last packet received
78
79	u32 oseqno;
80	sliding_window iseqno;
81
82	u8 protocol;
83
84	pkt_queue queue;
85
86	crypto_ctx octx, ictx;
87
88	enum conf_node::connectmode connectmode;
89	u8 prot_minor; // minor number of other side
90
91	void reset_dstaddr ();
92
93	void shutdown ();
94	void reset_connection ();
95	void establish_connection_cb (tstamp &ts); time_watcher establish_connection;
96	void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing)
97	void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe
98
99	void send_auth_request (const sockinfo &si, bool initiate);
100	void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
101	void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
102	void send_reset (const sockinfo &dsi);
103	void send_ping (const sockinfo &dsi, u8 pong = 0);
104	void send_data_packet (tap_packet *pkt, bool broadcast = false);
105	void inject_data_packet (tap_packet *pkt, bool broadcast = false);
106	void connect_request (int id);
107
108	void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
109	void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
110
111	void script_node ();
112	const char *script_node_up (int);
113	const char *script_node_down (int);
114
115	void dump_status ();
116
117	connection(struct vpn *vpn_);
118	~connection ();
119	};
120
121	struct vpn
122	{
123	int udpv4_fd;
124	int ipv4_fd;
125
126	int events;
127
128	enum {
129	EVENT_RECONNECT = 1,
130	EVENT_SHUTDOWN = 2,
131	};
132
133	void event_cb (tstamp &ts); time_watcher event;
134
135	tap_device *tap;
136
137	typedef vector<connection *> conns_vector;
138	conns_vector conns;
139
140	connection *find_router ();
141
142	void reconnect_all ();
143	void shutdown_all ();
144	void connect_request (int id);
145
146	void tap_ev (short revents); io_watcher tap_ev_watcher;
147	void ipv4_ev (short revents); io_watcher ipv4_ev_watcher;
148	void udpv4_ev (short revents); io_watcher udpv4_ev_watcher;
149
150	void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
151
152	void send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
153	void send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
154
155	vpn ();
156	~vpn ();
157
158	int setup ();
159
160	void dump_status ();
161
162	const char *script_if_up (int);
163	};
164
165	#endif
166