src/include/net.h

#ifndef NET_H
#define NET_H

/*
 *  Copyright (C) 2004-2005  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *
 *
 *  $Id: net.h,v 1.13 2005/11/24 12:32:11 debug Exp $
 *
 *  Emulated network support.  (See net.c for more info.)
 */

#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

struct emul;
struct ethernet_packet_link;
struct remote_net;


/*****************************************************************************/

/*  NOTE: udp_connection and tcp_connection are actually for
          internal use only.  */
struct udp_connection {
        int             in_use;
        int64_t         last_used_timestamp;

        /*  Inside:  */
        unsigned char   ethernet_address[6];
        unsigned char   inside_ip_address[4];
        int             inside_udp_port;

        /*  TODO: Fragment support for outgoing packets!  */
        int             fake_ns;

        /*  Outside:  */
        int             udp_id;
        int             socket;
        unsigned char   outside_ip_address[4];
        int             outside_udp_port;
};

struct tcp_connection {
        int             in_use;
        int64_t         last_used_timestamp;

        /*  Inside:  */
        unsigned char   ethernet_address[6];
        unsigned char   inside_ip_address[4];
        int             inside_tcp_port;
        uint32_t        inside_timestamp;

        /*  TODO:  tx and rx buffers?  */
        unsigned char   *incoming_buf;
        int             incoming_buf_rounds;
        int             incoming_buf_len;
        uint32_t        incoming_buf_seqnr;

        uint32_t        inside_seqnr;
        uint32_t        inside_acknr;
        uint32_t        outside_seqnr;
        uint32_t        outside_acknr;

        /*  Outside:  */
        int             state;
        int             tcp_id;
        int             socket;
        unsigned char   outside_ip_address[4];
        int             outside_tcp_port;
        uint32_t        outside_timestamp;
};

/*****************************************************************************/


#define MAX_TCP_CONNECTIONS     100
#define MAX_UDP_CONNECTIONS     100

struct net {
        /*  The emul struct which this net belong to:  */
        struct emul     *emul;

        /*  The network's addresses:  */
        struct in_addr  netmask_ipv4;
        int             netmask_ipv4_len;

        /*  NICs connected to this network:  */
        int             n_nics;
        void            **nic_extra;    /*  one void * per NIC  */

        /*  The "special machine":  */
        unsigned char   gateway_ipv4_addr[4];
        unsigned char   gateway_ethernet_addr[6];

        /*  Read from /etc/resolv.conf:  */
        char            *domain_name;
        int             nameserver_known;
        struct in_addr  nameserver_ipv4;

        int64_t         timestamp;

        struct ethernet_packet_link *first_ethernet_packet;
        struct ethernet_packet_link *last_ethernet_packet;

        struct udp_connection udp_connections[MAX_UDP_CONNECTIONS];
        struct tcp_connection tcp_connections[MAX_TCP_CONNECTIONS];

        /*  Distributed network:  */
        int             local_port;
        int             local_port_socket;
        struct remote_net *remote_nets;
};

/*  net.c:  */
void net_generate_unique_mac(struct machine *, unsigned char *macbuf);
int net_ethernet_rx_avail(struct net *net, void *extra);
int net_ethernet_rx(struct net *net, void *extra,
        unsigned char **packetp, int *lenp);
void net_ethernet_tx(struct net *net, void *extra,
        unsigned char *packet, int len);
void net_dumpinfo(struct net *net);
void net_add_nic(struct net *net, void *extra, unsigned char *macaddr);
struct net *net_init(struct emul *emul, int init_flags,
        char *ipv4addr, int netipv4len, char **remote, int n_remote,
        int local_port);

/*  Flag used to signify that this net should have a gateway:  */
#define NET_INIT_FLAG_GATEWAY           1


/*
 *  This is for internal use in src/net.c:
 */
struct ethernet_packet_link {
        struct ethernet_packet_link *prev;
        struct ethernet_packet_link *next;

        void            *extra;
        unsigned char   *data;
        int             len;
};

struct remote_net {
        struct remote_net *next;

        char            *name;
        struct in_addr  ipv4_addr;
        int             portnr;
};

#define TCP_OUTSIDE_TRYINGTOCONNECT     1
#define TCP_OUTSIDE_CONNECTED           2
#define TCP_OUTSIDE_DISCONNECTED        3
#define TCP_OUTSIDE_DISCONNECTED2       4

#define TCP_INCOMING_BUF_LEN    2000

#endif  /*  NET_H  */
1	dpavlin	4	#ifndef NET_H
2			#define NET_H
3
4			/*
5			* Copyright (C) 2004-2005 Anders Gavare. All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions are met:
9			*
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			* 3. The name of the author may not be used to endorse or promote products
16			* derived from this software without specific prior written permission.
17			*
18			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28			* SUCH DAMAGE.
29			*
30			*
31	dpavlin	20	* $Id: net.h,v 1.13 2005/11/24 12:32:11 debug Exp $
32	dpavlin	4	*
33			* Emulated network support. (See net.c for more info.)
34			*/
35
36			#include <netinet/in.h>
37			#include <arpa/inet.h>
38			#include <netdb.h>
39
40			struct emul;
41			struct ethernet_packet_link;
42	dpavlin	10	struct remote_net;
43	dpavlin	4
44
45			/*****************************************************************************/
46
47			/* NOTE: udp_connection and tcp_connection are actually for
48			internal use only. */
49			struct udp_connection {
50			int in_use;
51			int64_t last_used_timestamp;
52
53			/* Inside: */
54			unsigned char ethernet_address[6];
55			unsigned char inside_ip_address[4];
56			int inside_udp_port;
57
58			/* TODO: Fragment support for outgoing packets! */
59			int fake_ns;
60
61			/* Outside: */
62			int udp_id;
63			int socket;
64			unsigned char outside_ip_address[4];
65			int outside_udp_port;
66			};
67
68			struct tcp_connection {
69			int in_use;
70			int64_t last_used_timestamp;
71
72			/* Inside: */
73			unsigned char ethernet_address[6];
74			unsigned char inside_ip_address[4];
75			int inside_tcp_port;
76			uint32_t inside_timestamp;
77
78			/* TODO: tx and rx buffers? */
79			unsigned char *incoming_buf;
80			int incoming_buf_rounds;
81			int incoming_buf_len;
82			uint32_t incoming_buf_seqnr;
83
84			uint32_t inside_seqnr;
85			uint32_t inside_acknr;
86			uint32_t outside_seqnr;
87			uint32_t outside_acknr;
88
89			/* Outside: */
90			int state;
91			int tcp_id;
92			int socket;
93			unsigned char outside_ip_address[4];
94			int outside_tcp_port;
95			uint32_t outside_timestamp;
96			};
97
98			/*****************************************************************************/
99
100
101	dpavlin	20	#define MAX_TCP_CONNECTIONS 100
102			#define MAX_UDP_CONNECTIONS 100
103	dpavlin	4
104			struct net {
105			/* The emul struct which this net belong to: */
106			struct emul *emul;
107
108			/* The network's addresses: */
109			struct in_addr netmask_ipv4;
110			int netmask_ipv4_len;
111
112			/* NICs connected to this network: */
113			int n_nics;
114			void *nic_extra; / one void * per NIC */
115
116			/* The "special machine": */
117			unsigned char gateway_ipv4_addr[4];
118			unsigned char gateway_ethernet_addr[6];
119
120			/* Read from /etc/resolv.conf: */
121			char *domain_name;
122			int nameserver_known;
123			struct in_addr nameserver_ipv4;
124
125			int64_t timestamp;
126
127			struct ethernet_packet_link *first_ethernet_packet;
128			struct ethernet_packet_link *last_ethernet_packet;
129
130			struct udp_connection udp_connections[MAX_UDP_CONNECTIONS];
131			struct tcp_connection tcp_connections[MAX_TCP_CONNECTIONS];
132	dpavlin	10
133			/* Distributed network: */
134			int local_port;
135			int local_port_socket;
136			struct remote_net *remote_nets;
137	dpavlin	4	};
138
139			/* net.c: */
140			void net_generate_unique_mac(struct machine , unsigned char macbuf);
141			int net_ethernet_rx_avail(struct net net, void extra);
142			int net_ethernet_rx(struct net net, void extra,
143			unsigned char *packetp, int lenp);
144			void net_ethernet_tx(struct net net, void extra,
145			unsigned char *packet, int len);
146			void net_dumpinfo(struct net *net);
147			void net_add_nic(struct net net, void extra, unsigned char *macaddr);
148			struct net net_init(struct emul emul, int init_flags,
149	dpavlin	10	char ipv4addr, int netipv4len, char *remote, int n_remote,
150			int local_port);
151	dpavlin	4
152			/* Flag used to signify that this net should have a gateway: */
153			#define NET_INIT_FLAG_GATEWAY 1
154
155
156			/*
157			* This is for internal use in src/net.c:
158			*/
159			struct ethernet_packet_link {
160			struct ethernet_packet_link *prev;
161			struct ethernet_packet_link *next;
162
163			void *extra;
164			unsigned char *data;
165			int len;
166			};
167
168	dpavlin	10	struct remote_net {
169			struct remote_net *next;
170	dpavlin	4
171	dpavlin	10	char *name;
172			struct in_addr ipv4_addr;
173			int portnr;
174			};
175
176	dpavlin	4	#define TCP_OUTSIDE_TRYINGTOCONNECT 1
177			#define TCP_OUTSIDE_CONNECTED 2
178			#define TCP_OUTSIDE_DISCONNECTED 3
179			#define TCP_OUTSIDE_DISCONNECTED2 4
180
181			#define TCP_INCOMING_BUF_LEN 2000
182
183			#endif /* NET_H */