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	dpavlin	4	#ifndef NET_H
2			#define NET_H
3
4			/*
5	dpavlin	34	* Copyright (C) 2004-2007 Anders Gavare. All rights reserved.
6	dpavlin	4	*
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	34	* $Id: net.h,v 1.17 2006/12/30 13:31:01 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	dpavlin	32	/* 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	dpavlin	4	/*****************************************************************************/
51
52	dpavlin	32	/*
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	dpavlin	4	/* 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	dpavlin	20	#define MAX_TCP_CONNECTIONS 100
119			#define MAX_UDP_CONNECTIONS 100
120	dpavlin	4
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	dpavlin	10
150			/* Distributed network: */
151			int local_port;
152			int local_port_socket;
153			struct remote_net *remote_nets;
154	dpavlin	4	};
155
156	dpavlin	32	/* 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	dpavlin	4	/* net.c: */
176	dpavlin	32	struct ethernet_packet_link *net_allocate_ethernet_packet_link(
177			struct net net, void extra, size_t len);
178	dpavlin	4	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	dpavlin	32	const char ipv4addr, int netipv4len, char *remote, int n_remote,
187			int local_port, const char *settings_prefix);
188	dpavlin	4
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	dpavlin	10	struct remote_net {
206			struct remote_net *next;
207	dpavlin	4
208	dpavlin	10	char *name;
209			struct in_addr ipv4_addr;
210			int portnr;
211			};
212
213	dpavlin	4	#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	dpavlin	32	#define NET_ADDR_IPV4 1
221			#define NET_ADDR_IPV6 2
222			#define NET_ADDR_ETHERNET 3
223
224	dpavlin	4	#endif /* NET_H */