src/Unix/ether_unix.cpp

/*
 *  ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
 *
 *  Basilisk II (C) 1997-2004 Christian Bauer
 *
 *  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
 */

#include "sysdeps.h"

#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <pthread.h>
#include <semaphore.h>
#include <errno.h>
#include <stdio.h>
#include <map>

#if defined(__FreeBSD__) || defined(sgi)
#include <net/if.h>
#endif

#if defined(HAVE_LINUX_IF_H) && defined(HAVE_LINUX_IF_TUN_H)
#include <linux/if.h>
#include <linux/if_tun.h>
#endif

#if defined(HAVE_NET_IF_H) && defined(HAVE_NET_IF_TUN_H)
#include <net/if.h>
#include <net/if_tun.h>
#endif

#include "cpu_emulation.h"
#include "main.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "ether.h"
#include "ether_defs.h"

#ifndef NO_STD_NAMESPACE
using std::map;
#endif

#define DEBUG 0
#include "debug.h"

#define MONITOR 0


// Ethernet device types
enum {
        NET_IF_SHEEPNET,
        NET_IF_ETHERTAP,
        NET_IF_TUNTAP,
};

// Constants
static const char ETHERCONFIG_FILE_NAME[] = DATADIR "/tunconfig";

// Global variables
static int fd = -1;                                                     // fd of sheep_net device
static pthread_t ether_thread;                          // Packet reception thread
static pthread_attr_t ether_thread_attr;        // Packet reception thread attributes
static bool thread_active = false;                      // Flag: Packet reception thread installed
static sem_t int_ack;                                           // Interrupt acknowledge semaphore
static bool udp_tunnel;                                         // Flag: UDP tunnelling active, fd is the socket descriptor
static int net_if_type = -1;                            // Ethernet device type
static char *net_if_name = NULL;                        // TUN/TAP device name
static const char *net_if_script = NULL;        // Network config script

// Attached network protocols, maps protocol type to MacOS handler address
static map<uint16, uint32> net_protocols;

// Prototypes
static void *receive_func(void *arg);


/*
 *  Start packet reception thread
 */

static bool start_thread(void)
{
        if (sem_init(&int_ack, 0, 0) < 0) {
                printf("WARNING: Cannot init semaphore");
                return false;
        }

        Set_pthread_attr(&ether_thread_attr, 1);
        thread_active = (pthread_create(&ether_thread, &ether_thread_attr, receive_func, NULL) == 0);
        if (!thread_active) {
                printf("WARNING: Cannot start Ethernet thread");
                return false;
        }

        return true;
}


/*
 *  Stop packet reception thread
 */

static void stop_thread(void)
{
        if (thread_active) {
                pthread_cancel(ether_thread);
                pthread_join(ether_thread, NULL);
                sem_destroy(&int_ack);
                thread_active = false;
        }
}


/*
 *  Execute network script up|down
 */

static bool execute_network_script(const char *action)
{
        if (net_if_script == NULL || net_if_name == NULL)
                return false;

        int pid = fork();
        if (pid >= 0) {
                if (pid == 0) {
                        char *args[4];
                        args[0] = (char *)net_if_script;
                        args[1] = net_if_name;
                        args[2] = (char *)action;
                        args[3] = NULL;
                        execv(net_if_script, args);
                        exit(1);
                }
                int status;
                while (waitpid(pid, &status, 0) != pid);
                return WIFEXITED(status) && WEXITSTATUS(status) == 0;
        }

        return false;
}


/*
 *  Initialization
 */

bool ether_init(void)
{
        int nonblock = 1;
        char str[256];

        // Do nothing if no Ethernet device specified
        const char *name = PrefsFindString("ether");
        if (name == NULL)
                return false;

        // Determine Ethernet device type
        net_if_type = -1;
        if (strncmp(name, "tap", 3) == 0)
                net_if_type = NET_IF_ETHERTAP;
#if ENABLE_TUNTAP
        else if (strcmp(name, "tun") == 0)
                net_if_type = NET_IF_TUNTAP;
#endif
        else
                net_if_type = NET_IF_SHEEPNET;

        // Open sheep_net or ethertap or TUN/TAP device
        char dev_name[16];
        switch (net_if_type) {
        case NET_IF_ETHERTAP:
                sprintf(dev_name, "/dev/%s", name);
                break;
        case NET_IF_TUNTAP:
                strcpy(dev_name, "/dev/net/tun");
                break;
        case NET_IF_SHEEPNET:
                strcpy(dev_name, "/dev/sheep_net");
                break;
        }
        fd = open(dev_name, O_RDWR);
        if (fd < 0) {
                sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno));
                WarningAlert(str);
                goto open_error;
        }

#if ENABLE_TUNTAP
        // Open TUN/TAP interface
        if (net_if_type == NET_IF_TUNTAP) {
                struct ifreq ifr;
                memset(&ifr, 0, sizeof(ifr));
                ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
                strcpy(ifr.ifr_name, "tun%d");
                if (ioctl(fd, TUNSETIFF, (void *) &ifr) != 0) {
                        sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
                        WarningAlert(str);
                        goto open_error;
                }

                // Get network config script file path
                net_if_script = PrefsFindString("etherconfig");
                if (net_if_script == NULL)
                        net_if_script = ETHERCONFIG_FILE_NAME;

                // Start network script up
                if (net_if_script == NULL) {
                        sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script not found");
                        WarningAlert(str);
                        goto open_error;
                }
                net_if_name = strdup(ifr.ifr_name);
                if (!execute_network_script("up")) {
                        sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script execute error");
                        WarningAlert(str);
                        goto open_error;
                }
                D(bug("Connected to host network interface: %s\n", net_if_name));
        }
#endif

#if defined(__linux__)
        // Attach sheep_net to selected Ethernet card
        if (net_if_type == NET_IF_SHEEPNET && ioctl(fd, SIOCSIFLINK, name) < 0) {
                sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
                WarningAlert(str);
                goto open_error;
        }
#endif

        // Set nonblocking I/O
        ioctl(fd, FIONBIO, &nonblock);

        // Get Ethernet address
        if (net_if_type == NET_IF_ETHERTAP) {
                pid_t p = getpid();     // If configured for multicast, ethertap requires that the lower 32 bit of the Ethernet address are our PID
                ether_addr[0] = 0xfe;
                ether_addr[1] = 0xfd;
                ether_addr[2] = p >> 24;
                ether_addr[3] = p >> 16;
                ether_addr[4] = p >> 8;
                ether_addr[5] = p;
        } else
                ioctl(fd, SIOCGIFADDR, ether_addr);
        D(bug("Ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));

        // Start packet reception thread
        if (!start_thread())
                goto open_error;

        // Everything OK
        return true;

open_error:
        stop_thread();

        if (fd > 0) {
                close(fd);
                fd = -1;
        }
        return false;
}


/*
 *  Deinitialization
 */

void ether_exit(void)
{
        // Stop reception thread
        if (thread_active) {
                pthread_cancel(ether_thread);
                pthread_join(ether_thread, NULL);
                sem_destroy(&int_ack);
                thread_active = false;
        }

        // Shut down TUN/TAP interface
        if (net_if_type == NET_IF_TUNTAP)
                execute_network_script("down");

        // Free TUN/TAP device name
        if (net_if_name)
                free(net_if_name);

        // Close sheep_net device
        if (fd > 0)
                close(fd);
}


/*
 *  Reset
 */

void ether_reset(void)
{
        net_protocols.clear();
}


/*
 *  Add multicast address
 */

int16 ether_add_multicast(uint32 pb)
{
        if (net_if_type != NET_IF_TUNTAP && ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
                D(bug("WARNING: Couldn't enable multicast address\n"));
                if (net_if_type == NET_IF_ETHERTAP)
                        return noErr;
                else
                        return eMultiErr;
        } else
                return noErr;
}


/*
 *  Delete multicast address
 */

int16 ether_del_multicast(uint32 pb)
{
        if (net_if_type != NET_IF_TUNTAP && ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
                D(bug("WARNING: Couldn't disable multicast address\n"));
                return eMultiErr;
        } else
                return noErr;
}


/*
 *  Attach protocol handler
 */

int16 ether_attach_ph(uint16 type, uint32 handler)
{
        if (net_protocols.find(type) != net_protocols.end())
                return lapProtErr;
        net_protocols[type] = handler;
        return noErr;
}


/*
 *  Detach protocol handler
 */

int16 ether_detach_ph(uint16 type)
{
        if (net_protocols.erase(type) == 0)
                return lapProtErr;
        return noErr;
}


/*
 *  Transmit raw ethernet packet
 */

int16 ether_write(uint32 wds)
{
        // Copy packet to buffer
        uint8 packet[1516], *p = packet;
        int len = 0;
#if defined(__linux__)
        if (net_if_type == NET_IF_ETHERTAP) {
                *p++ = 0;       // Linux ethertap discards the first 2 bytes
                *p++ = 0;
                len += 2;
        }
#endif
        len += ether_wds_to_buffer(wds, p);

#if MONITOR
        bug("Sending Ethernet packet:\n");
        for (int i=0; i<len; i++) {
                bug("%02x ", packet[i]);
        }
        bug("\n");
#endif

        // Transmit packet
        if (write(fd, packet, len) < 0) {
                D(bug("WARNING: Couldn't transmit packet\n"));
                return excessCollsns;
        } else
                return noErr;
}


/*
 *  Start UDP packet reception thread
 */

bool ether_start_udp_thread(int socket_fd)
{
        fd = socket_fd;
        udp_tunnel = true;
        return start_thread();
}


/*
 *  Stop UDP packet reception thread
 */

void ether_stop_udp_thread(void)
{
        stop_thread();
        fd = -1;
}


/*
 *  Packet reception thread
 */

static void *receive_func(void *arg)
{
        for (;;) {

                // Wait for packets to arrive
                struct pollfd pf = {fd, POLLIN, 0};
                int res = poll(&pf, 1, -1);
                if (res <= 0)
                        break;

                // Trigger Ethernet interrupt
                D(bug(" packet received, triggering Ethernet interrupt\n"));
                SetInterruptFlag(INTFLAG_ETHER);
                TriggerInterrupt();

                // Wait for interrupt acknowledge by EtherInterrupt()
                sem_wait(&int_ack);
        }
        return NULL;
}


/*
 *  Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
 */

void EtherInterrupt(void)
{
        D(bug("EtherIRQ\n"));

        // Call protocol handler for received packets
        // NOTE: "static" so that packet[] has a 32-bit address (.data section, not stack)
        static uint8 packet[1516];
        ssize_t length;
        for (;;) {

                if (udp_tunnel) {

                        // Read packet from socket
                        struct sockaddr_in from;
                        socklen_t from_len = sizeof(from);
                        length = recvfrom(fd, packet, 1514, 0, (struct sockaddr *)&from, &from_len);
                        if (length < 14)
                                break;
                        ether_udp_read(packet, length, &from);

                } else {

                        // Read packet from sheep_net device
#if defined(__linux__)
                        length = read(fd, packet, net_if_type == NET_IF_ETHERTAP ? 1516 : 1514);
#else
                        length = read(fd, packet, 1514);
#endif
                        if (length < 14)
                                break;

#if MONITOR
                        bug("Receiving Ethernet packet:\n");
                        for (int i=0; i<length; i++) {
                                bug("%02x ", packet[i]);
                        }
                        bug("\n");
#endif

                        // Pointer to packet data (Ethernet header)
                        uint8 *p = packet;
#if defined(__linux__)
                        if (net_if_type == NET_IF_ETHERTAP) {
                                p += 2;                 // Linux ethertap has two random bytes before the packet
                                length -= 2;
                        }
#endif

                        // Get packet type
                        uint16 type = (p[12] << 8) | p[13];

                        // Look for protocol
                        uint16 search_type = (type <= 1500 ? 0 : type);
                        if (net_protocols.find(search_type) == net_protocols.end())
                                continue;
                        uint32 handler = net_protocols[search_type];

                        // No default handler
                        if (handler == 0)
                                continue;

                        // Copy header to RHA
                        Host2Mac_memcpy(ether_data + ed_RHA, p, 14);
                        D(bug(" header %08x%04x %08x%04x %04x\n", ReadMacInt32(ether_data + ed_RHA), ReadMacInt16(ether_data + ed_RHA + 4), ReadMacInt32(ether_data + ed_RHA + 6), ReadMacInt16(ether_data + ed_RHA + 10), ReadMacInt16(ether_data + ed_RHA + 12)));

                        // Call protocol handler
                        M68kRegisters r;
                        r.d[0] = type;                                                                  // Packet type
                        r.d[1] = length - 14;                                                   // Remaining packet length (without header, for ReadPacket)
                        r.a[0] = (uint32)p + 14;                                                // Pointer to packet (host address, for ReadPacket)
                        r.a[3] = ether_data + ed_RHA + 14;                              // Pointer behind header in RHA
                        r.a[4] = ether_data + ed_ReadPacket;                    // Pointer to ReadPacket/ReadRest routines
                        D(bug(" calling protocol handler %08x, type %08x, length %08x, data %08x, rha %08x, read_packet %08x\n", handler, r.d[0], r.d[1], r.a[0], r.a[3], r.a[4]));
                        Execute68k(handler, &r);
                }
        }

        // Acknowledge interrupt to reception thread
        D(bug(" EtherIRQ done\n"));
        sem_post(&int_ack);
}
Revision:	1.12
Committed:	2004-12-18T18:10:40Z (19 years, 11 months ago) by gbeauche
Branch:	MAIN
Changes since 1.11:	+2 -1 lines
Log Message:	Make EtherInterrupt/packet[] "static" so that it is allocated in the .data section, which is likely accessible under 32-bit address on 64-bit platforms
#	User	Rev	Content
1	cebix	1.1	/*
2			* ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
3			*
4	cebix	1.8	* Basilisk II (C) 1997-2004 Christian Bauer
5	cebix	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include "sysdeps.h"
22
23			#include <sys/ioctl.h>
24			#include <sys/poll.h>
25	cebix	1.3	#include <sys/socket.h>
26	gbeauche	1.9	#include <sys/wait.h>
27	cebix	1.3	#include <netinet/in.h>
28	cebix	1.1	#include <pthread.h>
29			#include <semaphore.h>
30			#include <errno.h>
31			#include <stdio.h>
32	cebix	1.3	#include <map>
33	cebix	1.2
34	cebix	1.5	#if defined(__FreeBSD__) \|\| defined(sgi)
35	cebix	1.1	#include <net/if.h>
36			#endif
37
38	gbeauche	1.9	#if defined(HAVE_LINUX_IF_H) && defined(HAVE_LINUX_IF_TUN_H)
39			#include <linux/if.h>
40			#include <linux/if_tun.h>
41			#endif
42
43			#if defined(HAVE_NET_IF_H) && defined(HAVE_NET_IF_TUN_H)
44			#include <net/if.h>
45			#include <net/if_tun.h>
46			#endif
47
48	cebix	1.1	#include "cpu_emulation.h"
49			#include "main.h"
50			#include "macos_util.h"
51			#include "prefs.h"
52			#include "user_strings.h"
53			#include "ether.h"
54			#include "ether_defs.h"
55
56	cebix	1.3	#ifndef NO_STD_NAMESPACE
57			using std::map;
58			#endif
59
60	cebix	1.1	#define DEBUG 0
61			#include "debug.h"
62
63			#define MONITOR 0
64
65
66	gbeauche	1.9	// Ethernet device types
67			enum {
68			NET_IF_SHEEPNET,
69			NET_IF_ETHERTAP,
70			NET_IF_TUNTAP,
71			};
72
73			// Constants
74			static const char ETHERCONFIG_FILE_NAME[] = DATADIR "/tunconfig";
75
76	cebix	1.1	// Global variables
77			static int fd = -1; // fd of sheep_net device
78			static pthread_t ether_thread; // Packet reception thread
79			static pthread_attr_t ether_thread_attr; // Packet reception thread attributes
80			static bool thread_active = false; // Flag: Packet reception thread installed
81			static sem_t int_ack; // Interrupt acknowledge semaphore
82	cebix	1.2	static bool udp_tunnel; // Flag: UDP tunnelling active, fd is the socket descriptor
83	gbeauche	1.9	static int net_if_type = -1; // Ethernet device type
84	gbeauche	1.10	static char *net_if_name = NULL; // TUN/TAP device name
85	gbeauche	1.9	static const char *net_if_script = NULL; // Network config script
86	cebix	1.1
87	cebix	1.3	// Attached network protocols, maps protocol type to MacOS handler address
88			static map<uint16, uint32> net_protocols;
89
90	cebix	1.1	// Prototypes
91			static void receive_func(void arg);
92
93
94			/*
95	cebix	1.2	* Start packet reception thread
96			*/
97
98			static bool start_thread(void)
99			{
100			if (sem_init(&int_ack, 0, 0) < 0) {
101			printf("WARNING: Cannot init semaphore");
102			return false;
103			}
104
105	cebix	1.7	Set_pthread_attr(&ether_thread_attr, 1);
106	cebix	1.2	thread_active = (pthread_create(&ether_thread, &ether_thread_attr, receive_func, NULL) == 0);
107			if (!thread_active) {
108			printf("WARNING: Cannot start Ethernet thread");
109			return false;
110			}
111
112			return true;
113			}
114
115
116			/*
117			* Stop packet reception thread
118			*/
119
120			static void stop_thread(void)
121			{
122			if (thread_active) {
123			pthread_cancel(ether_thread);
124			pthread_join(ether_thread, NULL);
125			sem_destroy(&int_ack);
126			thread_active = false;
127			}
128			}
129
130
131			/*
132	gbeauche	1.9	* Execute network script up\|down
133			*/
134
135			static bool execute_network_script(const char *action)
136			{
137			if (net_if_script == NULL \|\| net_if_name == NULL)
138			return false;
139
140			int pid = fork();
141			if (pid >= 0) {
142			if (pid == 0) {
143			char *args[4];
144			args[0] = (char *)net_if_script;
145	gbeauche	1.10	args[1] = net_if_name;
146	gbeauche	1.9	args[2] = (char *)action;
147			args[3] = NULL;
148			execv(net_if_script, args);
149			exit(1);
150			}
151			int status;
152			while (waitpid(pid, &status, 0) != pid);
153			return WIFEXITED(status) && WEXITSTATUS(status) == 0;
154			}
155
156			return false;
157			}
158
159
160			/*
161	cebix	1.1	* Initialization
162			*/
163
164	cebix	1.2	bool ether_init(void)
165	cebix	1.1	{
166			int nonblock = 1;
167			char str[256];
168
169			// Do nothing if no Ethernet device specified
170			const char *name = PrefsFindString("ether");
171			if (name == NULL)
172	cebix	1.2	return false;
173	cebix	1.1
174	gbeauche	1.9	// Determine Ethernet device type
175			net_if_type = -1;
176			if (strncmp(name, "tap", 3) == 0)
177			net_if_type = NET_IF_ETHERTAP;
178			#if ENABLE_TUNTAP
179			else if (strcmp(name, "tun") == 0)
180			net_if_type = NET_IF_TUNTAP;
181			#endif
182			else
183			net_if_type = NET_IF_SHEEPNET;
184	cebix	1.1
185	gbeauche	1.11	// Open sheep_net or ethertap or TUN/TAP device
186	cebix	1.1	char dev_name[16];
187	gbeauche	1.9	switch (net_if_type) {
188			case NET_IF_ETHERTAP:
189	cebix	1.1	sprintf(dev_name, "/dev/%s", name);
190	gbeauche	1.9	break;
191			case NET_IF_TUNTAP:
192	gbeauche	1.11	strcpy(dev_name, "/dev/net/tun");
193	gbeauche	1.9	break;
194			case NET_IF_SHEEPNET:
195	cebix	1.1	strcpy(dev_name, "/dev/sheep_net");
196	gbeauche	1.9	break;
197			}
198	cebix	1.1	fd = open(dev_name, O_RDWR);
199			if (fd < 0) {
200			sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno));
201			WarningAlert(str);
202			goto open_error;
203			}
204
205	gbeauche	1.9	#if ENABLE_TUNTAP
206			// Open TUN/TAP interface
207			if (net_if_type == NET_IF_TUNTAP) {
208			struct ifreq ifr;
209			memset(&ifr, 0, sizeof(ifr));
210			ifr.ifr_flags = IFF_TAP \| IFF_NO_PI;
211			strcpy(ifr.ifr_name, "tun%d");
212			if (ioctl(fd, TUNSETIFF, (void *) &ifr) != 0) {
213			sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
214			WarningAlert(str);
215			goto open_error;
216			}
217
218			// Get network config script file path
219			net_if_script = PrefsFindString("etherconfig");
220			if (net_if_script == NULL)
221			net_if_script = ETHERCONFIG_FILE_NAME;
222
223			// Start network script up
224			if (net_if_script == NULL) {
225			sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script not found");
226			WarningAlert(str);
227			goto open_error;
228			}
229	gbeauche	1.10	net_if_name = strdup(ifr.ifr_name);
230	gbeauche	1.9	if (!execute_network_script("up")) {
231			sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script execute error");
232			WarningAlert(str);
233			goto open_error;
234			}
235			D(bug("Connected to host network interface: %s\n", net_if_name));
236			}
237			#endif
238
239	cebix	1.1	#if defined(__linux__)
240			// Attach sheep_net to selected Ethernet card
241	gbeauche	1.9	if (net_if_type == NET_IF_SHEEPNET && ioctl(fd, SIOCSIFLINK, name) < 0) {
242	cebix	1.1	sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
243			WarningAlert(str);
244			goto open_error;
245			}
246			#endif
247
248			// Set nonblocking I/O
249			ioctl(fd, FIONBIO, &nonblock);
250
251			// Get Ethernet address
252	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
253	cebix	1.1	pid_t p = getpid(); // If configured for multicast, ethertap requires that the lower 32 bit of the Ethernet address are our PID
254			ether_addr[0] = 0xfe;
255			ether_addr[1] = 0xfd;
256			ether_addr[2] = p >> 24;
257			ether_addr[3] = p >> 16;
258			ether_addr[4] = p >> 8;
259			ether_addr[5] = p;
260			} else
261			ioctl(fd, SIOCGIFADDR, ether_addr);
262			D(bug("Ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5]));
263
264			// Start packet reception thread
265	cebix	1.2	if (!start_thread())
266	cebix	1.1	goto open_error;
267
268			// Everything OK
269	cebix	1.2	return true;
270	cebix	1.1
271			open_error:
272	cebix	1.2	stop_thread();
273
274	cebix	1.1	if (fd > 0) {
275			close(fd);
276			fd = -1;
277			}
278	cebix	1.2	return false;
279	cebix	1.1	}
280
281
282			/*
283			* Deinitialization
284			*/
285
286	cebix	1.2	void ether_exit(void)
287	cebix	1.1	{
288			// Stop reception thread
289			if (thread_active) {
290			pthread_cancel(ether_thread);
291			pthread_join(ether_thread, NULL);
292			sem_destroy(&int_ack);
293			thread_active = false;
294			}
295
296	gbeauche	1.10	// Shut down TUN/TAP interface
297			if (net_if_type == NET_IF_TUNTAP)
298			execute_network_script("down");
299
300			// Free TUN/TAP device name
301			if (net_if_name)
302			free(net_if_name);
303
304	cebix	1.1	// Close sheep_net device
305			if (fd > 0)
306			close(fd);
307			}
308
309
310			/*
311			* Reset
312			*/
313
314	cebix	1.3	void ether_reset(void)
315	cebix	1.1	{
316	cebix	1.3	net_protocols.clear();
317	cebix	1.1	}
318
319
320			/*
321			* Add multicast address
322			*/
323
324			int16 ether_add_multicast(uint32 pb)
325			{
326	gbeauche	1.9	if (net_if_type != NET_IF_TUNTAP && ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
327	cebix	1.1	D(bug("WARNING: Couldn't enable multicast address\n"));
328	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP)
329	cebix	1.1	return noErr;
330			else
331			return eMultiErr;
332			} else
333			return noErr;
334			}
335
336
337			/*
338			* Delete multicast address
339			*/
340
341			int16 ether_del_multicast(uint32 pb)
342			{
343	gbeauche	1.9	if (net_if_type != NET_IF_TUNTAP && ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
344	cebix	1.1	D(bug("WARNING: Couldn't disable multicast address\n"));
345			return eMultiErr;
346			} else
347			return noErr;
348			}
349
350
351			/*
352			* Attach protocol handler
353			*/
354
355			int16 ether_attach_ph(uint16 type, uint32 handler)
356			{
357	cebix	1.3	if (net_protocols.find(type) != net_protocols.end())
358	cebix	1.1	return lapProtErr;
359	cebix	1.3	net_protocols[type] = handler;
360			return noErr;
361	cebix	1.1	}
362
363
364			/*
365			* Detach protocol handler
366			*/
367
368			int16 ether_detach_ph(uint16 type)
369			{
370	cebix	1.3	if (net_protocols.erase(type) == 0)
371	cebix	1.1	return lapProtErr;
372	cebix	1.3	return noErr;
373	cebix	1.1	}
374
375
376			/*
377			* Transmit raw ethernet packet
378			*/
379
380			int16 ether_write(uint32 wds)
381			{
382			// Copy packet to buffer
383			uint8 packet[1516], *p = packet;
384			int len = 0;
385			#if defined(__linux__)
386	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
387	cebix	1.1	*p++ = 0; // Linux ethertap discards the first 2 bytes
388			*p++ = 0;
389			len += 2;
390			}
391			#endif
392	cebix	1.2	len += ether_wds_to_buffer(wds, p);
393	cebix	1.1
394			#if MONITOR
395			bug("Sending Ethernet packet:\n");
396			for (int i=0; i<len; i++) {
397			bug("%02x ", packet[i]);
398			}
399			bug("\n");
400			#endif
401
402			// Transmit packet
403			if (write(fd, packet, len) < 0) {
404			D(bug("WARNING: Couldn't transmit packet\n"));
405			return excessCollsns;
406			} else
407			return noErr;
408			}
409
410
411			/*
412	cebix	1.2	* Start UDP packet reception thread
413			*/
414
415			bool ether_start_udp_thread(int socket_fd)
416			{
417			fd = socket_fd;
418			udp_tunnel = true;
419			return start_thread();
420			}
421
422
423			/*
424			* Stop UDP packet reception thread
425			*/
426
427			void ether_stop_udp_thread(void)
428			{
429			stop_thread();
430			fd = -1;
431			}
432
433
434			/*
435	cebix	1.1	* Packet reception thread
436			*/
437
438			static void receive_func(void arg)
439			{
440			for (;;) {
441
442			// Wait for packets to arrive
443			struct pollfd pf = {fd, POLLIN, 0};
444			int res = poll(&pf, 1, -1);
445			if (res <= 0)
446			break;
447
448			// Trigger Ethernet interrupt
449			D(bug(" packet received, triggering Ethernet interrupt\n"));
450			SetInterruptFlag(INTFLAG_ETHER);
451			TriggerInterrupt();
452
453			// Wait for interrupt acknowledge by EtherInterrupt()
454			sem_wait(&int_ack);
455			}
456			return NULL;
457			}
458
459
460			/*
461			* Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
462			*/
463
464			void EtherInterrupt(void)
465			{
466			D(bug("EtherIRQ\n"));
467
468			// Call protocol handler for received packets
469	gbeauche	1.12	// NOTE: "static" so that packet[] has a 32-bit address (.data section, not stack)
470			static uint8 packet[1516];
471	cebix	1.2	ssize_t length;
472	cebix	1.1	for (;;) {
473
474	cebix	1.2	if (udp_tunnel) {
475
476			// Read packet from socket
477			struct sockaddr_in from;
478			socklen_t from_len = sizeof(from);
479			length = recvfrom(fd, packet, 1514, 0, (struct sockaddr *)&from, &from_len);
480			if (length < 14)
481			break;
482			ether_udp_read(packet, length, &from);
483
484			} else {
485
486			// Read packet from sheep_net device
487	cebix	1.1	#if defined(__linux__)
488	gbeauche	1.9	length = read(fd, packet, net_if_type == NET_IF_ETHERTAP ? 1516 : 1514);
489	cebix	1.1	#else
490	cebix	1.2	length = read(fd, packet, 1514);
491	cebix	1.1	#endif
492	cebix	1.2	if (length < 14)
493			break;
494	cebix	1.1
495			#if MONITOR
496	cebix	1.2	bug("Receiving Ethernet packet:\n");
497			for (int i=0; i<length; i++) {
498			bug("%02x ", packet[i]);
499			}
500			bug("\n");
501	cebix	1.1	#endif
502
503	cebix	1.2	// Pointer to packet data (Ethernet header)
504			uint8 *p = packet;
505	cebix	1.1	#if defined(__linux__)
506	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
507	cebix	1.2	p += 2; // Linux ethertap has two random bytes before the packet
508			length -= 2;
509			}
510	cebix	1.1	#endif
511
512	cebix	1.2	// Get packet type
513			uint16 type = (p[12] << 8) \| p[13];
514	cebix	1.1
515	cebix	1.2	// Look for protocol
516	cebix	1.3	uint16 search_type = (type <= 1500 ? 0 : type);
517			if (net_protocols.find(search_type) == net_protocols.end())
518	cebix	1.2	continue;
519	cebix	1.3	uint32 handler = net_protocols[search_type];
520	cebix	1.2
521			// No default handler
522	cebix	1.3	if (handler == 0)
523	cebix	1.2	continue;
524
525			// Copy header to RHA
526			Host2Mac_memcpy(ether_data + ed_RHA, p, 14);
527			D(bug(" header %08x%04x %08x%04x %04x\n", ReadMacInt32(ether_data + ed_RHA), ReadMacInt16(ether_data + ed_RHA + 4), ReadMacInt32(ether_data + ed_RHA + 6), ReadMacInt16(ether_data + ed_RHA + 10), ReadMacInt16(ether_data + ed_RHA + 12)));
528
529			// Call protocol handler
530			M68kRegisters r;
531			r.d[0] = type; // Packet type
532			r.d[1] = length - 14; // Remaining packet length (without header, for ReadPacket)
533			r.a[0] = (uint32)p + 14; // Pointer to packet (host address, for ReadPacket)
534			r.a[3] = ether_data + ed_RHA + 14; // Pointer behind header in RHA
535			r.a[4] = ether_data + ed_ReadPacket; // Pointer to ReadPacket/ReadRest routines
536	cebix	1.3	D(bug(" calling protocol handler %08x, type %08x, length %08x, data %08x, rha %08x, read_packet %08x\n", handler, r.d[0], r.d[1], r.a[0], r.a[3], r.a[4]));
537			Execute68k(handler, &r);
538	cebix	1.2	}
539	cebix	1.1	}
540
541			// Acknowledge interrupt to reception thread
542			D(bug(" EtherIRQ done\n"));
543			sem_post(&int_ack);
544			}