src/include/net.h

#ifndef NET_H
#define NET_H

/*
 *  Copyright (C) 2004-2007  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 1.17 2006/12/30 13:31:01 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;


/*  Default emulated "simple" IPv4 network, if nothing else is specified:  */
#define NET_DEFAULT_IPV4_MASK           "10.0.0.0"
#define NET_DEFAULT_IPV4_LEN            8


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

/*
 *  NOTE: These are already defined in <net/ethernet.h> on e.g. FreeBSD,
 *        but they are missing in some systems (at least in Linux).
 */
#define ETHERTYPE_SPRITE                0x0500
#define ETHERTYPE_IP                    0x0800
#define ETHERTYPE_ARP                   0x0806
#define ETHERTYPE_REVARP                0x8035
#define ETHERTYPE_IPV6                  0x86DD

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

/*  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_misc.c:  */
void net_debugaddr(void *addr, int type);
void net_generate_unique_mac(struct machine *, unsigned char *macbuf);
void send_udp(struct in_addr *addrp, int portnr, unsigned char *packet,
        size_t len);

/*  net_ip.c:  */
void net_ip_checksum(unsigned char *ip_header, int chksumoffset, int len);
void net_ip_tcp_checksum(unsigned char *tcp_header, int chksumoffset,
        int tcp_len, unsigned char *srcaddr, unsigned char *dstaddr,
        int udpflag);
void net_ip_tcp_connectionreply(struct net *net, void *extra,
        int con_id, int connecting, unsigned char *data, int datalen, int rst);
void net_ip_broadcast(struct net *net, void *extra,
        unsigned char *packet, int len);
void net_ip(struct net *net, void *extra, unsigned char *packet, int len);
void net_udp_rx_avail(struct net *net, void *extra);
void net_tcp_rx_avail(struct net *net, void *extra);

/*  net.c:  */
struct ethernet_packet_link *net_allocate_ethernet_packet_link(
        struct net *net, void *extra, size_t len);
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,
        const char *ipv4addr, int netipv4len, char **remote, int n_remote,
        int local_port, const char *settings_prefix);

/*  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

#define NET_ADDR_IPV4           1
#define NET_ADDR_IPV6           2
#define NET_ADDR_ETHERNET       3

#endif  /*  NET_H  */
1	#ifndef NET_H
2	#define NET_H
3
4	/*
5	* Copyright (C) 2004-2007 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	* $Id: net.h,v 1.17 2006/12/30 13:31:01 debug Exp $
32	*
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	struct remote_net;
43
44
45	/* Default emulated "simple" IPv4 network, if nothing else is specified: */
46	#define NET_DEFAULT_IPV4_MASK "10.0.0.0"
47	#define NET_DEFAULT_IPV4_LEN 8
48
49
50	/*****************************************************************************/
51
52	/*
53	* NOTE: These are already defined in <net/ethernet.h> on e.g. FreeBSD,
54	* but they are missing in some systems (at least in Linux).
55	*/
56	#define ETHERTYPE_SPRITE 0x0500
57	#define ETHERTYPE_IP 0x0800
58	#define ETHERTYPE_ARP 0x0806
59	#define ETHERTYPE_REVARP 0x8035
60	#define ETHERTYPE_IPV6 0x86DD
61
62	/*****************************************************************************/
63
64	/* NOTE: udp_connection and tcp_connection are actually for
65	internal use only. */
66	struct udp_connection {
67	int in_use;
68	int64_t last_used_timestamp;
69
70	/* Inside: */
71	unsigned char ethernet_address[6];
72	unsigned char inside_ip_address[4];
73	int inside_udp_port;
74
75	/* TODO: Fragment support for outgoing packets! */
76	int fake_ns;
77
78	/* Outside: */
79	int udp_id;
80	int socket;
81	unsigned char outside_ip_address[4];
82	int outside_udp_port;
83	};
84
85	struct tcp_connection {
86	int in_use;
87	int64_t last_used_timestamp;
88
89	/* Inside: */
90	unsigned char ethernet_address[6];
91	unsigned char inside_ip_address[4];
92	int inside_tcp_port;
93	uint32_t inside_timestamp;
94
95	/* TODO: tx and rx buffers? */
96	unsigned char *incoming_buf;
97	int incoming_buf_rounds;
98	int incoming_buf_len;
99	uint32_t incoming_buf_seqnr;
100
101	uint32_t inside_seqnr;
102	uint32_t inside_acknr;
103	uint32_t outside_seqnr;
104	uint32_t outside_acknr;
105
106	/* Outside: */
107	int state;
108	int tcp_id;
109	int socket;
110	unsigned char outside_ip_address[4];
111	int outside_tcp_port;
112	uint32_t outside_timestamp;
113	};
114
115	/*****************************************************************************/
116
117
118	#define MAX_TCP_CONNECTIONS 100
119	#define MAX_UDP_CONNECTIONS 100
120
121	struct net {
122	/* The emul struct which this net belong to: */
123	struct emul *emul;
124
125	/* The network's addresses: */
126	struct in_addr netmask_ipv4;
127	int netmask_ipv4_len;
128
129	/* NICs connected to this network: */
130	int n_nics;
131	void *nic_extra; / one void * per NIC */
132
133	/* The "special machine": */
134	unsigned char gateway_ipv4_addr[4];
135	unsigned char gateway_ethernet_addr[6];
136
137	/* Read from /etc/resolv.conf: */
138	char *domain_name;
139	int nameserver_known;
140	struct in_addr nameserver_ipv4;
141
142	int64_t timestamp;
143
144	struct ethernet_packet_link *first_ethernet_packet;
145	struct ethernet_packet_link *last_ethernet_packet;
146
147	struct udp_connection udp_connections[MAX_UDP_CONNECTIONS];
148	struct tcp_connection tcp_connections[MAX_TCP_CONNECTIONS];
149
150	/* Distributed network: */
151	int local_port;
152	int local_port_socket;
153	struct remote_net *remote_nets;
154	};
155
156	/* net_misc.c: */
157	void net_debugaddr(void *addr, int type);
158	void net_generate_unique_mac(struct machine , unsigned char macbuf);
159	void send_udp(struct in_addr addrp, int portnr, unsigned char packet,
160	size_t len);
161
162	/* net_ip.c: */
163	void net_ip_checksum(unsigned char *ip_header, int chksumoffset, int len);
164	void net_ip_tcp_checksum(unsigned char *tcp_header, int chksumoffset,
165	int tcp_len, unsigned char srcaddr, unsigned char dstaddr,
166	int udpflag);
167	void net_ip_tcp_connectionreply(struct net net, void extra,
168	int con_id, int connecting, unsigned char *data, int datalen, int rst);
169	void net_ip_broadcast(struct net net, void extra,
170	unsigned char *packet, int len);
171	void net_ip(struct net net, void extra, unsigned char *packet, int len);
172	void net_udp_rx_avail(struct net net, void extra);
173	void net_tcp_rx_avail(struct net net, void extra);
174
175	/* net.c: */
176	struct ethernet_packet_link *net_allocate_ethernet_packet_link(
177	struct net net, void extra, size_t len);
178	int net_ethernet_rx_avail(struct net net, void extra);
179	int net_ethernet_rx(struct net net, void extra,
180	unsigned char *packetp, int lenp);
181	void net_ethernet_tx(struct net net, void extra,
182	unsigned char *packet, int len);
183	void net_dumpinfo(struct net *net);
184	void net_add_nic(struct net net, void extra, unsigned char *macaddr);
185	struct net net_init(struct emul emul, int init_flags,
186	const char ipv4addr, int netipv4len, char *remote, int n_remote,
187	int local_port, const char *settings_prefix);
188
189	/* Flag used to signify that this net should have a gateway: */
190	#define NET_INIT_FLAG_GATEWAY 1
191
192
193	/*
194	* This is for internal use in src/net.c:
195	*/
196	struct ethernet_packet_link {
197	struct ethernet_packet_link *prev;
198	struct ethernet_packet_link *next;
199
200	void *extra;
201	unsigned char *data;
202	int len;
203	};
204
205	struct remote_net {
206	struct remote_net *next;
207
208	char *name;
209	struct in_addr ipv4_addr;
210	int portnr;
211	};
212
213	#define TCP_OUTSIDE_TRYINGTOCONNECT 1
214	#define TCP_OUTSIDE_CONNECTED 2
215	#define TCP_OUTSIDE_DISCONNECTED 3
216	#define TCP_OUTSIDE_DISCONNECTED2 4
217
218	#define TCP_INCOMING_BUF_LEN 2000
219
220	#define NET_ADDR_IPV4 1
221	#define NET_ADDR_IPV6 2
222	#define NET_ADDR_ETHERNET 3
223
224	#endif /* NET_H */