src/Unix/ether_unix.cpp

/*
 *  ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
 *
 *  Basilisk II (C) 1997-2005 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

// XXX: slirp works on 64-bit platforms, sometimes
#define HAVE_SLIRP 1
#include "libslirp.h"

#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,
        NET_IF_SLIRP
};

// 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
static pthread_t slirp_thread;                          // Slirp reception thread
static bool slirp_thread_active = false;        // Flag: Slirp reception threadinstalled
static int slirp_output_fd = -1;                        // fd of slirp output pipe

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

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

#ifdef HAVE_SLIRP
        if (net_if_type == NET_IF_SLIRP) {
                slirp_thread_active = (pthread_create(&slirp_thread, NULL, slirp_receive_func, NULL) == 0);
                if (!slirp_thread_active) {
                        printf("WARNING: Cannot start slirp reception thread\n");
                        return false;
                }
        }
#endif

        return true;
}


/*
 *  Stop packet reception thread
 */

static void stop_thread(void)
{
#ifdef HAVE_SLIRP
        if (slirp_thread_active) {
                pthread_cancel(slirp_thread);
                pthread_join(slirp_thread, NULL);
                slirp_thread_active = false;
        }
#endif

        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
#ifdef HAVE_SLIRP
        else if (strcmp(name, "slirp") == 0)
                net_if_type = NET_IF_SLIRP;
#endif
        else
                net_if_type = NET_IF_SHEEPNET;

#ifdef HAVE_SLIRP
        // Initialize slirp library
        if (net_if_type == NET_IF_SLIRP) {
                slirp_init();

                // Open slirp output pipe
                int fds[2];
                if (pipe(fds) < 0)
                        return false;
                fd = fds[0];
                slirp_output_fd = fds[1];
        }
#endif

        // 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;
        }
        if (net_if_type != NET_IF_SLIRP) {
                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;
#ifdef HAVE_SLIRP
        } else if (net_if_type == NET_IF_SLIRP) {
                ether_addr[0] = 0x52;
                ether_addr[1] = 0x54;
                ether_addr[2] = 0x00;
                ether_addr[3] = 0x12;
                ether_addr[4] = 0x34;
                ether_addr[5] = 0x56;
#endif
        } 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;
        }
        if (slirp_output_fd >= 0) {
                close(slirp_output_fd);
                slirp_output_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);

        // Close slirp output buffer
        if (slirp_output_fd > 0)
                close(slirp_output_fd);
}


/*
 *  Reset
 */

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


/*
 *  Add multicast address
 */

int16 ether_add_multicast(uint32 pb)
{
        switch (net_if_type) {
        case NET_IF_ETHERTAP:
        case NET_IF_SHEEPNET:
                if (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;
                }
        default:
                return noErr;
        }
}


/*
 *  Delete multicast address
 */

int16 ether_del_multicast(uint32 pb)
{
        switch (net_if_type) {
        case NET_IF_ETHERTAP:
        case NET_IF_SHEEPNET:
                if (ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
                        D(bug("WARNING: Couldn't disable multicast address\n"));
                        return eMultiErr;
                }
        default:
                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
#ifdef HAVE_SLIRP
        if (net_if_type == NET_IF_SLIRP) {
                slirp_input(packet, len);
                return noErr;
        } else
#endif
        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;
}


/*
 *  SLIRP output buffer glue
 */

#ifdef HAVE_SLIRP
int slirp_can_output(void)
{
        return 1;
}

void slirp_output(const uint8 *packet, int len)
{
        write(slirp_output_fd, packet, len);
}

void *slirp_receive_func(void *arg)
{
        for (;;) {
                // Wait for packets to arrive
                fd_set rfds, wfds, xfds;
                int nfds;
                struct timeval tv;

                nfds = -1;
                FD_ZERO(&rfds);
                FD_ZERO(&wfds);
                FD_ZERO(&xfds);
                slirp_select_fill(&nfds, &rfds, &wfds, &xfds);
                tv.tv_sec = 0;
                tv.tv_usec = 16667;
                if (select(nfds + 1, &rfds, &wfds, &xfds, &tv) >= 0)
                        slirp_select_poll(&rfds, &wfds, &xfds);
        }
        return NULL;
}
#else
int slirp_can_output(void)
{
        return 0;
}

void slirp_output(const uint8 *packet, int len)
{
}
#endif


/*
 *  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
        EthernetPacket ether_packet;
        uint32 packet = ether_packet.addr();
        ssize_t length;
        for (;;) {

                if (udp_tunnel) {

                        // Read packet from socket
                        struct sockaddr_in from;
                        socklen_t from_len = sizeof(from);
                        length = recvfrom(fd, Mac2HostAddr(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, Mac2HostAddr(packet), net_if_type == NET_IF_ETHERTAP ? 1516 : 1514);
#else
                        length = read(fd, Mac2HostAddr(packet), 1514);
#endif
                        if (length < 14)
                                break;

#if MONITOR
                        bug("Receiving Ethernet packet:\n");
                        for (int i=0; i<length; i++) {
                                bug("%02x ", ReadMacInt8(packet + i));
                        }
                        bug("\n");
#endif

                        // Pointer to packet data (Ethernet header)
                        uint32 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 = ReadMacInt16(p + 12);

                        // 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
                        Mac2Mac_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] = p + 14;                                                                // Pointer to packet (Mac 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:	1.16
Committed:	2005-05-13T14:02:36Z (19 years, 4 months ago) by gbeauche
Branch:	MAIN
Changes since 1.15:	+2 -4 lines
Log Message:	Some 64-bit fixes to bootp, icmp, udp (cu-seeme). However, it can happen that on certain occasions, it doesn't work. Some timing problem?
#	User	Rev	Content
1	cebix	1.1	/*
2			* ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
3			*
4	gbeauche	1.13	* Basilisk II (C) 1997-2005 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	gbeauche	1.16	// XXX: slirp works on 64-bit platforms, sometimes
49	gbeauche	1.15	#define HAVE_SLIRP 1
50	gbeauche	1.16	#include "libslirp.h"
51	gbeauche	1.15
52	cebix	1.1	#include "cpu_emulation.h"
53			#include "main.h"
54			#include "macos_util.h"
55			#include "prefs.h"
56			#include "user_strings.h"
57			#include "ether.h"
58			#include "ether_defs.h"
59
60	cebix	1.3	#ifndef NO_STD_NAMESPACE
61			using std::map;
62			#endif
63
64	cebix	1.1	#define DEBUG 0
65			#include "debug.h"
66
67			#define MONITOR 0
68
69
70	gbeauche	1.9	// Ethernet device types
71			enum {
72			NET_IF_SHEEPNET,
73			NET_IF_ETHERTAP,
74			NET_IF_TUNTAP,
75	gbeauche	1.15	NET_IF_SLIRP
76	gbeauche	1.9	};
77
78			// Constants
79			static const char ETHERCONFIG_FILE_NAME[] = DATADIR "/tunconfig";
80
81	cebix	1.1	// Global variables
82			static int fd = -1; // fd of sheep_net device
83			static pthread_t ether_thread; // Packet reception thread
84			static pthread_attr_t ether_thread_attr; // Packet reception thread attributes
85			static bool thread_active = false; // Flag: Packet reception thread installed
86			static sem_t int_ack; // Interrupt acknowledge semaphore
87	cebix	1.2	static bool udp_tunnel; // Flag: UDP tunnelling active, fd is the socket descriptor
88	gbeauche	1.9	static int net_if_type = -1; // Ethernet device type
89	gbeauche	1.10	static char *net_if_name = NULL; // TUN/TAP device name
90	gbeauche	1.9	static const char *net_if_script = NULL; // Network config script
91	gbeauche	1.15	static pthread_t slirp_thread; // Slirp reception thread
92			static bool slirp_thread_active = false; // Flag: Slirp reception threadinstalled
93			static int slirp_output_fd = -1; // fd of slirp output pipe
94	cebix	1.1
95	cebix	1.3	// Attached network protocols, maps protocol type to MacOS handler address
96			static map<uint16, uint32> net_protocols;
97
98	cebix	1.1	// Prototypes
99			static void receive_func(void arg);
100	gbeauche	1.15	static void slirp_receive_func(void arg);
101	cebix	1.1
102
103			/*
104	cebix	1.2	* Start packet reception thread
105			*/
106
107			static bool start_thread(void)
108			{
109			if (sem_init(&int_ack, 0, 0) < 0) {
110			printf("WARNING: Cannot init semaphore");
111			return false;
112			}
113
114	cebix	1.7	Set_pthread_attr(&ether_thread_attr, 1);
115	cebix	1.2	thread_active = (pthread_create(&ether_thread, &ether_thread_attr, receive_func, NULL) == 0);
116			if (!thread_active) {
117			printf("WARNING: Cannot start Ethernet thread");
118			return false;
119			}
120
121	gbeauche	1.15	#ifdef HAVE_SLIRP
122			if (net_if_type == NET_IF_SLIRP) {
123			slirp_thread_active = (pthread_create(&slirp_thread, NULL, slirp_receive_func, NULL) == 0);
124			if (!slirp_thread_active) {
125			printf("WARNING: Cannot start slirp reception thread\n");
126			return false;
127			}
128			}
129			#endif
130
131	cebix	1.2	return true;
132			}
133
134
135			/*
136			* Stop packet reception thread
137			*/
138
139			static void stop_thread(void)
140			{
141	gbeauche	1.15	#ifdef HAVE_SLIRP
142			if (slirp_thread_active) {
143			pthread_cancel(slirp_thread);
144			pthread_join(slirp_thread, NULL);
145			slirp_thread_active = false;
146			}
147			#endif
148
149	cebix	1.2	if (thread_active) {
150			pthread_cancel(ether_thread);
151			pthread_join(ether_thread, NULL);
152			sem_destroy(&int_ack);
153			thread_active = false;
154			}
155			}
156
157
158			/*
159	gbeauche	1.9	* Execute network script up\|down
160			*/
161
162			static bool execute_network_script(const char *action)
163			{
164			if (net_if_script == NULL \|\| net_if_name == NULL)
165			return false;
166
167			int pid = fork();
168			if (pid >= 0) {
169			if (pid == 0) {
170			char *args[4];
171			args[0] = (char *)net_if_script;
172	gbeauche	1.10	args[1] = net_if_name;
173	gbeauche	1.9	args[2] = (char *)action;
174			args[3] = NULL;
175			execv(net_if_script, args);
176			exit(1);
177			}
178			int status;
179			while (waitpid(pid, &status, 0) != pid);
180			return WIFEXITED(status) && WEXITSTATUS(status) == 0;
181			}
182
183			return false;
184			}
185
186
187			/*
188	cebix	1.1	* Initialization
189			*/
190
191	cebix	1.2	bool ether_init(void)
192	cebix	1.1	{
193			int nonblock = 1;
194			char str[256];
195
196			// Do nothing if no Ethernet device specified
197			const char *name = PrefsFindString("ether");
198			if (name == NULL)
199	cebix	1.2	return false;
200	cebix	1.1
201	gbeauche	1.9	// Determine Ethernet device type
202			net_if_type = -1;
203			if (strncmp(name, "tap", 3) == 0)
204			net_if_type = NET_IF_ETHERTAP;
205			#if ENABLE_TUNTAP
206			else if (strcmp(name, "tun") == 0)
207			net_if_type = NET_IF_TUNTAP;
208			#endif
209	gbeauche	1.15	#ifdef HAVE_SLIRP
210			else if (strcmp(name, "slirp") == 0)
211			net_if_type = NET_IF_SLIRP;
212			#endif
213	gbeauche	1.9	else
214			net_if_type = NET_IF_SHEEPNET;
215	cebix	1.1
216	gbeauche	1.15	#ifdef HAVE_SLIRP
217			// Initialize slirp library
218			if (net_if_type == NET_IF_SLIRP) {
219			slirp_init();
220
221			// Open slirp output pipe
222			int fds[2];
223			if (pipe(fds) < 0)
224			return false;
225			fd = fds[0];
226			slirp_output_fd = fds[1];
227			}
228			#endif
229
230	gbeauche	1.11	// Open sheep_net or ethertap or TUN/TAP device
231	cebix	1.1	char dev_name[16];
232	gbeauche	1.9	switch (net_if_type) {
233			case NET_IF_ETHERTAP:
234	cebix	1.1	sprintf(dev_name, "/dev/%s", name);
235	gbeauche	1.9	break;
236			case NET_IF_TUNTAP:
237	gbeauche	1.11	strcpy(dev_name, "/dev/net/tun");
238	gbeauche	1.9	break;
239			case NET_IF_SHEEPNET:
240	cebix	1.1	strcpy(dev_name, "/dev/sheep_net");
241	gbeauche	1.9	break;
242			}
243	gbeauche	1.15	if (net_if_type != NET_IF_SLIRP) {
244			fd = open(dev_name, O_RDWR);
245			if (fd < 0) {
246			sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno));
247			WarningAlert(str);
248			goto open_error;
249			}
250	cebix	1.1	}
251
252	gbeauche	1.9	#if ENABLE_TUNTAP
253			// Open TUN/TAP interface
254			if (net_if_type == NET_IF_TUNTAP) {
255			struct ifreq ifr;
256			memset(&ifr, 0, sizeof(ifr));
257			ifr.ifr_flags = IFF_TAP \| IFF_NO_PI;
258			strcpy(ifr.ifr_name, "tun%d");
259			if (ioctl(fd, TUNSETIFF, (void *) &ifr) != 0) {
260			sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
261			WarningAlert(str);
262			goto open_error;
263			}
264
265			// Get network config script file path
266			net_if_script = PrefsFindString("etherconfig");
267			if (net_if_script == NULL)
268			net_if_script = ETHERCONFIG_FILE_NAME;
269
270			// Start network script up
271			if (net_if_script == NULL) {
272			sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script not found");
273			WarningAlert(str);
274			goto open_error;
275			}
276	gbeauche	1.10	net_if_name = strdup(ifr.ifr_name);
277	gbeauche	1.9	if (!execute_network_script("up")) {
278			sprintf(str, GetString(STR_TUN_TAP_CONFIG_WARN), "script execute error");
279			WarningAlert(str);
280			goto open_error;
281			}
282			D(bug("Connected to host network interface: %s\n", net_if_name));
283			}
284			#endif
285
286	cebix	1.1	#if defined(__linux__)
287			// Attach sheep_net to selected Ethernet card
288	gbeauche	1.9	if (net_if_type == NET_IF_SHEEPNET && ioctl(fd, SIOCSIFLINK, name) < 0) {
289	cebix	1.1	sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno));
290			WarningAlert(str);
291			goto open_error;
292			}
293			#endif
294
295			// Set nonblocking I/O
296			ioctl(fd, FIONBIO, &nonblock);
297
298			// Get Ethernet address
299	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
300	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
301			ether_addr[0] = 0xfe;
302			ether_addr[1] = 0xfd;
303			ether_addr[2] = p >> 24;
304			ether_addr[3] = p >> 16;
305			ether_addr[4] = p >> 8;
306			ether_addr[5] = p;
307	gbeauche	1.15	#ifdef HAVE_SLIRP
308			} else if (net_if_type == NET_IF_SLIRP) {
309			ether_addr[0] = 0x52;
310			ether_addr[1] = 0x54;
311			ether_addr[2] = 0x00;
312			ether_addr[3] = 0x12;
313			ether_addr[4] = 0x34;
314			ether_addr[5] = 0x56;
315			#endif
316	cebix	1.1	} else
317			ioctl(fd, SIOCGIFADDR, ether_addr);
318			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]));
319
320			// Start packet reception thread
321	cebix	1.2	if (!start_thread())
322	cebix	1.1	goto open_error;
323
324			// Everything OK
325	cebix	1.2	return true;
326	cebix	1.1
327			open_error:
328	cebix	1.2	stop_thread();
329
330	cebix	1.1	if (fd > 0) {
331			close(fd);
332			fd = -1;
333			}
334	gbeauche	1.15	if (slirp_output_fd >= 0) {
335			close(slirp_output_fd);
336			slirp_output_fd = -1;
337			}
338	cebix	1.2	return false;
339	cebix	1.1	}
340
341
342			/*
343			* Deinitialization
344			*/
345
346	cebix	1.2	void ether_exit(void)
347	cebix	1.1	{
348			// Stop reception thread
349			if (thread_active) {
350			pthread_cancel(ether_thread);
351			pthread_join(ether_thread, NULL);
352			sem_destroy(&int_ack);
353			thread_active = false;
354			}
355
356	gbeauche	1.10	// Shut down TUN/TAP interface
357			if (net_if_type == NET_IF_TUNTAP)
358			execute_network_script("down");
359
360			// Free TUN/TAP device name
361			if (net_if_name)
362			free(net_if_name);
363
364	cebix	1.1	// Close sheep_net device
365			if (fd > 0)
366			close(fd);
367	gbeauche	1.15
368			// Close slirp output buffer
369			if (slirp_output_fd > 0)
370			close(slirp_output_fd);
371	cebix	1.1	}
372
373
374			/*
375			* Reset
376			*/
377
378	cebix	1.3	void ether_reset(void)
379	cebix	1.1	{
380	cebix	1.3	net_protocols.clear();
381	cebix	1.1	}
382
383
384			/*
385			* Add multicast address
386			*/
387
388			int16 ether_add_multicast(uint32 pb)
389			{
390	gbeauche	1.15	switch (net_if_type) {
391			case NET_IF_ETHERTAP:
392			case NET_IF_SHEEPNET:
393			if (ioctl(fd, SIOCADDMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
394			D(bug("WARNING: Couldn't enable multicast address\n"));
395			if (net_if_type == NET_IF_ETHERTAP)
396			return noErr;
397			else
398			return eMultiErr;
399			}
400			default:
401	cebix	1.1	return noErr;
402	gbeauche	1.15	}
403	cebix	1.1	}
404
405
406			/*
407			* Delete multicast address
408			*/
409
410			int16 ether_del_multicast(uint32 pb)
411			{
412	gbeauche	1.15	switch (net_if_type) {
413			case NET_IF_ETHERTAP:
414			case NET_IF_SHEEPNET:
415			if (ioctl(fd, SIOCDELMULTI, Mac2HostAddr(pb + eMultiAddr)) < 0) {
416			D(bug("WARNING: Couldn't disable multicast address\n"));
417			return eMultiErr;
418			}
419			default:
420	cebix	1.1	return noErr;
421	gbeauche	1.15	}
422	cebix	1.1	}
423
424
425			/*
426			* Attach protocol handler
427			*/
428
429			int16 ether_attach_ph(uint16 type, uint32 handler)
430			{
431	cebix	1.3	if (net_protocols.find(type) != net_protocols.end())
432	cebix	1.1	return lapProtErr;
433	cebix	1.3	net_protocols[type] = handler;
434			return noErr;
435	cebix	1.1	}
436
437
438			/*
439			* Detach protocol handler
440			*/
441
442			int16 ether_detach_ph(uint16 type)
443			{
444	cebix	1.3	if (net_protocols.erase(type) == 0)
445	cebix	1.1	return lapProtErr;
446	cebix	1.3	return noErr;
447	cebix	1.1	}
448
449
450			/*
451			* Transmit raw ethernet packet
452			*/
453
454			int16 ether_write(uint32 wds)
455			{
456			// Copy packet to buffer
457			uint8 packet[1516], *p = packet;
458			int len = 0;
459			#if defined(__linux__)
460	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
461	cebix	1.1	*p++ = 0; // Linux ethertap discards the first 2 bytes
462			*p++ = 0;
463			len += 2;
464			}
465			#endif
466	cebix	1.2	len += ether_wds_to_buffer(wds, p);
467	cebix	1.1
468			#if MONITOR
469			bug("Sending Ethernet packet:\n");
470			for (int i=0; i<len; i++) {
471			bug("%02x ", packet[i]);
472			}
473			bug("\n");
474			#endif
475
476			// Transmit packet
477	gbeauche	1.15	#ifdef HAVE_SLIRP
478			if (net_if_type == NET_IF_SLIRP) {
479			slirp_input(packet, len);
480			return noErr;
481			} else
482			#endif
483	cebix	1.1	if (write(fd, packet, len) < 0) {
484			D(bug("WARNING: Couldn't transmit packet\n"));
485			return excessCollsns;
486			} else
487			return noErr;
488			}
489
490
491			/*
492	cebix	1.2	* Start UDP packet reception thread
493			*/
494
495			bool ether_start_udp_thread(int socket_fd)
496			{
497			fd = socket_fd;
498			udp_tunnel = true;
499			return start_thread();
500			}
501
502
503			/*
504			* Stop UDP packet reception thread
505			*/
506
507			void ether_stop_udp_thread(void)
508			{
509			stop_thread();
510			fd = -1;
511			}
512
513
514			/*
515	gbeauche	1.15	* SLIRP output buffer glue
516			*/
517
518			#ifdef HAVE_SLIRP
519			int slirp_can_output(void)
520			{
521			return 1;
522			}
523
524			void slirp_output(const uint8 *packet, int len)
525			{
526			write(slirp_output_fd, packet, len);
527			}
528
529			void slirp_receive_func(void arg)
530			{
531			for (;;) {
532			// Wait for packets to arrive
533			fd_set rfds, wfds, xfds;
534			int nfds;
535			struct timeval tv;
536
537			nfds = -1;
538			FD_ZERO(&rfds);
539			FD_ZERO(&wfds);
540			FD_ZERO(&xfds);
541			slirp_select_fill(&nfds, &rfds, &wfds, &xfds);
542			tv.tv_sec = 0;
543			tv.tv_usec = 16667;
544			if (select(nfds + 1, &rfds, &wfds, &xfds, &tv) >= 0)
545			slirp_select_poll(&rfds, &wfds, &xfds);
546			}
547			return NULL;
548			}
549			#else
550			int slirp_can_output(void)
551			{
552			return 0;
553			}
554
555			void slirp_output(const uint8 *packet, int len)
556			{
557			}
558			#endif
559
560
561			/*
562	cebix	1.1	* Packet reception thread
563			*/
564
565			static void receive_func(void arg)
566			{
567			for (;;) {
568
569			// Wait for packets to arrive
570			struct pollfd pf = {fd, POLLIN, 0};
571			int res = poll(&pf, 1, -1);
572			if (res <= 0)
573			break;
574
575			// Trigger Ethernet interrupt
576			D(bug(" packet received, triggering Ethernet interrupt\n"));
577			SetInterruptFlag(INTFLAG_ETHER);
578			TriggerInterrupt();
579
580			// Wait for interrupt acknowledge by EtherInterrupt()
581			sem_wait(&int_ack);
582			}
583			return NULL;
584			}
585
586
587			/*
588			* Ethernet interrupt - activate deferred tasks to call IODone or protocol handlers
589			*/
590
591			void EtherInterrupt(void)
592			{
593			D(bug("EtherIRQ\n"));
594
595			// Call protocol handler for received packets
596	gbeauche	1.14	EthernetPacket ether_packet;
597			uint32 packet = ether_packet.addr();
598	cebix	1.2	ssize_t length;
599	cebix	1.1	for (;;) {
600
601	cebix	1.2	if (udp_tunnel) {
602
603			// Read packet from socket
604			struct sockaddr_in from;
605			socklen_t from_len = sizeof(from);
606	gbeauche	1.14	length = recvfrom(fd, Mac2HostAddr(packet), 1514, 0, (struct sockaddr *)&from, &from_len);
607	cebix	1.2	if (length < 14)
608			break;
609			ether_udp_read(packet, length, &from);
610
611			} else {
612
613			// Read packet from sheep_net device
614	cebix	1.1	#if defined(__linux__)
615	gbeauche	1.14	length = read(fd, Mac2HostAddr(packet), net_if_type == NET_IF_ETHERTAP ? 1516 : 1514);
616	cebix	1.1	#else
617	gbeauche	1.14	length = read(fd, Mac2HostAddr(packet), 1514);
618	cebix	1.1	#endif
619	cebix	1.2	if (length < 14)
620			break;
621	cebix	1.1
622			#if MONITOR
623	cebix	1.2	bug("Receiving Ethernet packet:\n");
624			for (int i=0; i<length; i++) {
625	gbeauche	1.14	bug("%02x ", ReadMacInt8(packet + i));
626	cebix	1.2	}
627			bug("\n");
628	cebix	1.1	#endif
629
630	cebix	1.2	// Pointer to packet data (Ethernet header)
631	gbeauche	1.14	uint32 p = packet;
632	cebix	1.1	#if defined(__linux__)
633	gbeauche	1.9	if (net_if_type == NET_IF_ETHERTAP) {
634	cebix	1.2	p += 2; // Linux ethertap has two random bytes before the packet
635			length -= 2;
636			}
637	cebix	1.1	#endif
638
639	cebix	1.2	// Get packet type
640	gbeauche	1.14	uint16 type = ReadMacInt16(p + 12);
641	cebix	1.1
642	cebix	1.2	// Look for protocol
643	cebix	1.3	uint16 search_type = (type <= 1500 ? 0 : type);
644			if (net_protocols.find(search_type) == net_protocols.end())
645	cebix	1.2	continue;
646	cebix	1.3	uint32 handler = net_protocols[search_type];
647	cebix	1.2
648			// No default handler
649	cebix	1.3	if (handler == 0)
650	cebix	1.2	continue;
651
652			// Copy header to RHA
653	gbeauche	1.14	Mac2Mac_memcpy(ether_data + ed_RHA, p, 14);
654	cebix	1.2	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)));
655
656			// Call protocol handler
657			M68kRegisters r;
658			r.d[0] = type; // Packet type
659			r.d[1] = length - 14; // Remaining packet length (without header, for ReadPacket)
660	gbeauche	1.14	r.a[0] = p + 14; // Pointer to packet (Mac address, for ReadPacket)
661	cebix	1.2	r.a[3] = ether_data + ed_RHA + 14; // Pointer behind header in RHA
662			r.a[4] = ether_data + ed_ReadPacket; // Pointer to ReadPacket/ReadRest routines
663	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]));
664			Execute68k(handler, &r);
665	cebix	1.2	}
666	cebix	1.1	}
667
668			// Acknowledge interrupt to reception thread
669			D(bug(" EtherIRQ done\n"));
670			sem_post(&int_ack);
671			}