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 <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

#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


// 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 is_ethertap;                                        // Flag: Ethernet device is ethertap
static bool udp_tunnel;                                         // Flag: UDP tunnelling active, fd is the socket descriptor

// 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;
        }
}


/*
 *  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;

        // Is it Ethertap?
        is_ethertap = (strncmp(name, "tap", 3) == 0);

        // Open sheep_net or ethertap device
        char dev_name[16];
        if (is_ethertap)
                sprintf(dev_name, "/dev/%s", name);
        else
                strcpy(dev_name, "/dev/sheep_net");
        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 defined(__linux__)
        // Attach sheep_net to selected Ethernet card
        if (!is_ethertap && 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 (is_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;
        }

        // 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 (ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
                D(bug("WARNING: Couldn't enable multicast address\n"));
                if (is_ethertap)
                        return noErr;
                else
                        return eMultiErr;
        } else
                return noErr;
}


/*
 *  Delete multicast address
 */

int16 ether_del_multicast(uint32 pb)
{
        if (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 (is_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
        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, is_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 (is_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:	1.8
Committed:	2004-01-12T15:29:25Z (20 years, 4 months ago) by cebix
Branch:	MAIN
CVS Tags:	nigel-build-16, nigel-build-15
Changes since 1.7:	+1 -1 lines
Log Message:	Happy New Year! :)
#	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			#include <netinet/in.h>
27	cebix	1.1	#include <pthread.h>
28			#include <semaphore.h>
29			#include <errno.h>
30			#include <stdio.h>
31	cebix	1.3	#include <map>
32	cebix	1.2
33	cebix	1.5	#if defined(__FreeBSD__) \|\| defined(sgi)
34	cebix	1.1	#include <net/if.h>
35			#endif
36
37			#include "cpu_emulation.h"
38			#include "main.h"
39			#include "macos_util.h"
40			#include "prefs.h"
41			#include "user_strings.h"
42			#include "ether.h"
43			#include "ether_defs.h"
44
45	cebix	1.3	#ifndef NO_STD_NAMESPACE
46			using std::map;
47			#endif
48
49	cebix	1.1	#define DEBUG 0
50			#include "debug.h"
51
52			#define MONITOR 0
53
54
55			// Global variables
56			static int fd = -1; // fd of sheep_net device
57			static pthread_t ether_thread; // Packet reception thread
58			static pthread_attr_t ether_thread_attr; // Packet reception thread attributes
59			static bool thread_active = false; // Flag: Packet reception thread installed
60			static sem_t int_ack; // Interrupt acknowledge semaphore
61			static bool is_ethertap; // Flag: Ethernet device is ethertap
62	cebix	1.2	static bool udp_tunnel; // Flag: UDP tunnelling active, fd is the socket descriptor
63	cebix	1.1
64	cebix	1.3	// Attached network protocols, maps protocol type to MacOS handler address
65			static map<uint16, uint32> net_protocols;
66
67	cebix	1.1	// Prototypes
68			static void receive_func(void arg);
69
70
71			/*
72	cebix	1.2	* Start packet reception thread
73			*/
74
75			static bool start_thread(void)
76			{
77			if (sem_init(&int_ack, 0, 0) < 0) {
78			printf("WARNING: Cannot init semaphore");
79			return false;
80			}
81
82	cebix	1.7	Set_pthread_attr(&ether_thread_attr, 1);
83	cebix	1.2	thread_active = (pthread_create(&ether_thread, &ether_thread_attr, receive_func, NULL) == 0);
84			if (!thread_active) {
85			printf("WARNING: Cannot start Ethernet thread");
86			return false;
87			}
88
89			return true;
90			}
91
92
93			/*
94			* Stop packet reception thread
95			*/
96
97			static void stop_thread(void)
98			{
99			if (thread_active) {
100			pthread_cancel(ether_thread);
101			pthread_join(ether_thread, NULL);
102			sem_destroy(&int_ack);
103			thread_active = false;
104			}
105			}
106
107
108			/*
109	cebix	1.1	* Initialization
110			*/
111
112	cebix	1.2	bool ether_init(void)
113	cebix	1.1	{
114			int nonblock = 1;
115			char str[256];
116
117			// Do nothing if no Ethernet device specified
118			const char *name = PrefsFindString("ether");
119			if (name == NULL)
120	cebix	1.2	return false;
121	cebix	1.1
122			// Is it Ethertap?
123			is_ethertap = (strncmp(name, "tap", 3) == 0);
124
125			// Open sheep_net or ethertap device
126			char dev_name[16];
127			if (is_ethertap)
128			sprintf(dev_name, "/dev/%s", name);
129			else
130			strcpy(dev_name, "/dev/sheep_net");
131			fd = open(dev_name, O_RDWR);
132			if (fd < 0) {
133			sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno));
134			WarningAlert(str);
135			goto open_error;
136			}
137
138			#if defined(__linux__)
139			// Attach sheep_net to selected Ethernet card
140			if (!is_ethertap && ioctl(fd, SIOCSIFLINK, name) < 0) {
141			sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
142			WarningAlert(str);
143			goto open_error;
144			}
145			#endif
146
147			// Set nonblocking I/O
148			ioctl(fd, FIONBIO, &nonblock);
149
150			// Get Ethernet address
151			if (is_ethertap) {
152			pid_t p = getpid(); // If configured for multicast, ethertap requires that the lower 32 bit of the Ethernet address are our PID
153			ether_addr[0] = 0xfe;
154			ether_addr[1] = 0xfd;
155			ether_addr[2] = p >> 24;
156			ether_addr[3] = p >> 16;
157			ether_addr[4] = p >> 8;
158			ether_addr[5] = p;
159			} else
160			ioctl(fd, SIOCGIFADDR, ether_addr);
161			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]));
162
163			// Start packet reception thread
164	cebix	1.2	if (!start_thread())
165	cebix	1.1	goto open_error;
166
167			// Everything OK
168	cebix	1.2	return true;
169	cebix	1.1
170			open_error:
171	cebix	1.2	stop_thread();
172
173	cebix	1.1	if (fd > 0) {
174			close(fd);
175			fd = -1;
176			}
177	cebix	1.2	return false;
178	cebix	1.1	}
179
180
181			/*
182			* Deinitialization
183			*/
184
185	cebix	1.2	void ether_exit(void)
186	cebix	1.1	{
187			// Stop reception thread
188			if (thread_active) {
189			pthread_cancel(ether_thread);
190			pthread_join(ether_thread, NULL);
191			sem_destroy(&int_ack);
192			thread_active = false;
193			}
194
195			// Close sheep_net device
196			if (fd > 0)
197			close(fd);
198			}
199
200
201			/*
202			* Reset
203			*/
204
205	cebix	1.3	void ether_reset(void)
206	cebix	1.1	{
207	cebix	1.3	net_protocols.clear();
208	cebix	1.1	}
209
210
211			/*
212			* Add multicast address
213			*/
214
215			int16 ether_add_multicast(uint32 pb)
216			{
217			if (ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
218			D(bug("WARNING: Couldn't enable multicast address\n"));
219			if (is_ethertap)
220			return noErr;
221			else
222			return eMultiErr;
223			} else
224			return noErr;
225			}
226
227
228			/*
229			* Delete multicast address
230			*/
231
232			int16 ether_del_multicast(uint32 pb)
233			{
234			if (ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
235			D(bug("WARNING: Couldn't disable multicast address\n"));
236			return eMultiErr;
237			} else
238			return noErr;
239			}
240
241
242			/*
243			* Attach protocol handler
244			*/
245
246			int16 ether_attach_ph(uint16 type, uint32 handler)
247			{
248	cebix	1.3	if (net_protocols.find(type) != net_protocols.end())
249	cebix	1.1	return lapProtErr;
250	cebix	1.3	net_protocols[type] = handler;
251			return noErr;
252	cebix	1.1	}
253
254
255			/*
256			* Detach protocol handler
257			*/
258
259			int16 ether_detach_ph(uint16 type)
260			{
261	cebix	1.3	if (net_protocols.erase(type) == 0)
262	cebix	1.1	return lapProtErr;
263	cebix	1.3	return noErr;
264	cebix	1.1	}
265
266
267			/*
268			* Transmit raw ethernet packet
269			*/
270
271			int16 ether_write(uint32 wds)
272			{
273			// Copy packet to buffer
274			uint8 packet[1516], *p = packet;
275			int len = 0;
276			#if defined(__linux__)
277			if (is_ethertap) {
278			*p++ = 0; // Linux ethertap discards the first 2 bytes
279			*p++ = 0;
280			len += 2;
281			}
282			#endif
283	cebix	1.2	len += ether_wds_to_buffer(wds, p);
284	cebix	1.1
285			#if MONITOR
286			bug("Sending Ethernet packet:\n");
287			for (int i=0; i<len; i++) {
288			bug("%02x ", packet[i]);
289			}
290			bug("\n");
291			#endif
292
293			// Transmit packet
294			if (write(fd, packet, len) < 0) {
295			D(bug("WARNING: Couldn't transmit packet\n"));
296			return excessCollsns;
297			} else
298			return noErr;
299			}
300
301
302			/*
303	cebix	1.2	* Start UDP packet reception thread
304			*/
305
306			bool ether_start_udp_thread(int socket_fd)
307			{
308			fd = socket_fd;
309			udp_tunnel = true;
310			return start_thread();
311			}
312
313
314			/*
315			* Stop UDP packet reception thread
316			*/
317
318			void ether_stop_udp_thread(void)
319			{
320			stop_thread();
321			fd = -1;
322			}
323
324
325			/*
326	cebix	1.1	* Packet reception thread
327			*/
328
329			static void receive_func(void arg)
330			{
331			for (;;) {
332
333			// Wait for packets to arrive
334			struct pollfd pf = {fd, POLLIN, 0};
335			int res = poll(&pf, 1, -1);
336			if (res <= 0)
337			break;
338
339			// Trigger Ethernet interrupt
340			D(bug(" packet received, triggering Ethernet interrupt\n"));
341			SetInterruptFlag(INTFLAG_ETHER);
342			TriggerInterrupt();
343
344			// Wait for interrupt acknowledge by EtherInterrupt()
345			sem_wait(&int_ack);
346			}
347			return NULL;
348			}
349
350
351			/*
352			* Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
353			*/
354
355			void EtherInterrupt(void)
356			{
357			D(bug("EtherIRQ\n"));
358
359			// Call protocol handler for received packets
360			uint8 packet[1516];
361	cebix	1.2	ssize_t length;
362	cebix	1.1	for (;;) {
363
364	cebix	1.2	if (udp_tunnel) {
365
366			// Read packet from socket
367			struct sockaddr_in from;
368			socklen_t from_len = sizeof(from);
369			length = recvfrom(fd, packet, 1514, 0, (struct sockaddr *)&from, &from_len);
370			if (length < 14)
371			break;
372			ether_udp_read(packet, length, &from);
373
374			} else {
375
376			// Read packet from sheep_net device
377	cebix	1.1	#if defined(__linux__)
378	cebix	1.2	length = read(fd, packet, is_ethertap ? 1516 : 1514);
379	cebix	1.1	#else
380	cebix	1.2	length = read(fd, packet, 1514);
381	cebix	1.1	#endif
382	cebix	1.2	if (length < 14)
383			break;
384	cebix	1.1
385			#if MONITOR
386	cebix	1.2	bug("Receiving Ethernet packet:\n");
387			for (int i=0; i<length; i++) {
388			bug("%02x ", packet[i]);
389			}
390			bug("\n");
391	cebix	1.1	#endif
392
393	cebix	1.2	// Pointer to packet data (Ethernet header)
394			uint8 *p = packet;
395	cebix	1.1	#if defined(__linux__)
396	cebix	1.2	if (is_ethertap) {
397			p += 2; // Linux ethertap has two random bytes before the packet
398			length -= 2;
399			}
400	cebix	1.1	#endif
401
402	cebix	1.2	// Get packet type
403			uint16 type = (p[12] << 8) \| p[13];
404	cebix	1.1
405	cebix	1.2	// Look for protocol
406	cebix	1.3	uint16 search_type = (type <= 1500 ? 0 : type);
407			if (net_protocols.find(search_type) == net_protocols.end())
408	cebix	1.2	continue;
409	cebix	1.3	uint32 handler = net_protocols[search_type];
410	cebix	1.2
411			// No default handler
412	cebix	1.3	if (handler == 0)
413	cebix	1.2	continue;
414
415			// Copy header to RHA
416			Host2Mac_memcpy(ether_data + ed_RHA, p, 14);
417			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)));
418
419			// Call protocol handler
420			M68kRegisters r;
421			r.d[0] = type; // Packet type
422			r.d[1] = length - 14; // Remaining packet length (without header, for ReadPacket)
423			r.a[0] = (uint32)p + 14; // Pointer to packet (host address, for ReadPacket)
424			r.a[3] = ether_data + ed_RHA + 14; // Pointer behind header in RHA
425			r.a[4] = ether_data + ed_ReadPacket; // Pointer to ReadPacket/ReadRest routines
426	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]));
427			Execute68k(handler, &r);
428	cebix	1.2	}
429	cebix	1.1	}
430
431			// Acknowledge interrupt to reception thread
432			D(bug(" EtherIRQ done\n"));
433			sem_post(&int_ack);
434			}