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- /*
- * ether_unix.cpp - Ethernet device driver, Unix specific stuff (Linux and FreeBSD)
- *
- * Basilisk II (C) 1997-2001 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 <pthread.h>
- #include <semaphore.h>
- #include <errno.h>
- #include <stdio.h>
-
- #if defined(__FreeBSD__)
- #include <sys/socket.h>
- #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"
-
- #define DEBUG 0
- #include "debug.h"
-
- #define MONITOR 0
-
-
- // List of attached protocols
- struct NetProtocol {
- NetProtocol *next;
- uint16 type;
- uint32 handler;
- };
-
- static NetProtocol *prot_list = NULL;
-
-
- // 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
-
- // Prototypes
- static void *receive_func(void *arg);
-
-
- /*
- * Find protocol in list
- */
-
- static NetProtocol *find_protocol(uint16 type)
- {
- // All 802.2 types are the same
- if (type <= 1500)
- type = 0;
-
- // Search list (we could use hashing here but there are usually only three
- // handlers installed: 0x0000 for AppleTalk and 0x0800/0x0806 for TCP/IP)
- NetProtocol *p = prot_list;
- while (p) {
- if (p->type == type)
- return p;
- p = p->next;
- }
- return NULL;
- }
-
-
- /*
- * Remove all protocols
- */
-
- static void remove_all_protocols(void)
- {
- NetProtocol *p = prot_list;
- while (p) {
- NetProtocol *next = p->next;
- delete p;
- p = next;
- }
- prot_list = NULL;
- }
-
-
- /*
- * Initialization
- */
-
- void EtherInit(void)
- {
- int nonblock = 1;
- char str[256];
-
- // Do nothing if no Ethernet device specified
- const char *name = PrefsFindString("ether");
- if (name == NULL)
- return;
-
- // 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 (sem_init(&int_ack, 0, 0) < 0) {
- printf("WARNING: Cannot init semaphore");
- goto open_error;
- }
- pthread_attr_init(ðer_thread_attr);
- #if defined(_POSIX_THREAD_PRIORITY_SCHEDULING)
- if (geteuid() == 0) {
- pthread_attr_setinheritsched(ðer_thread_attr, PTHREAD_EXPLICIT_SCHED);
- pthread_attr_setschedpolicy(ðer_thread_attr, SCHED_FIFO);
- struct sched_param fifo_param;
- fifo_param.sched_priority = (sched_get_priority_min(SCHED_FIFO) + sched_get_priority_max(SCHED_FIFO)) / 2 + 1;
- pthread_attr_setschedparam(ðer_thread_attr, &fifo_param);
- }
- #endif
- thread_active = (pthread_create(ðer_thread, ðer_thread_attr, receive_func, NULL) == 0);
- if (!thread_active) {
- printf("WARNING: Cannot start Ethernet thread");
- goto open_error;
- }
-
- // Everything OK
- net_open = true;
- return;
-
- open_error:
- if (thread_active) {
- pthread_cancel(ether_thread);
- pthread_join(ether_thread, NULL);
- sem_destroy(&int_ack);
- thread_active = false;
- }
- if (fd > 0) {
- close(fd);
- fd = -1;
- }
- }
-
-
- /*
- * Deinitialization
- */
-
- void EtherExit(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);
-
- // Remove all protocols
- remove_all_protocols();
- }
-
-
- /*
- * Reset
- */
-
- void EtherReset(void)
- {
- remove_all_protocols();
- }
-
-
- /*
- * 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)
- {
- // Already attached?
- NetProtocol *p = find_protocol(type);
- if (p != NULL)
- return lapProtErr;
- else {
- // No, create and attach
- p = new NetProtocol;
- p->next = prot_list;
- p->type = type;
- p->handler = handler;
- prot_list = p;
- return noErr;
- }
- }
-
-
- /*
- * Detach protocol handler
- */
-
- int16 ether_detach_ph(uint16 type)
- {
- NetProtocol *p = find_protocol(type);
- if (p != NULL) {
- NetProtocol *q = prot_list;
- if (p == q) {
- prot_list = p->next;
- delete p;
- return noErr;
- }
- while (q) {
- if (q->next == p) {
- q->next = p->next;
- delete p;
- return noErr;
- }
- q = q->next;
- }
- return lapProtErr;
- } else
- return lapProtErr;
- }
-
-
- /*
- * Transmit raw ethernet packet
- */
-
- int16 ether_write(uint32 wds)
- {
- // Set source address
- uint32 hdr = ReadMacInt32(wds + 2);
- Host2Mac_memcpy(hdr + 6, ether_addr, 6);
-
- // 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
- for (;;) {
- int w = ReadMacInt16(wds);
- if (w == 0)
- break;
- Mac2Host_memcpy(p, ReadMacInt32(wds + 2), w);
- len += w;
- p += w;
- wds += 6;
- }
-
- #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;
- }
-
-
- /*
- * 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];
- for (;;) {
-
- // Read packet from sheep_net device
- #if defined(__linux__)
- ssize_t length = read(fd, packet, is_ethertap ? 1516 : 1514);
- #else
- ssize_t 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 = ntohs(*(uint16 *)(p + 12));
-
- // Look for protocol
- NetProtocol *prot = find_protocol(type);
- if (prot == NULL)
- continue;
-
- // No default handler
- if (prot->handler == 0)
- continue;
-
- // Copy header to RHA
- Host2Mac_memcpy(ether_data + ed_RHA, p, 14);
- D(bug(" header %08lx%04lx %08lx%04lx %04lx\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 %08lx, type %08lx, length %08lx, data %08lx, rha %08lx, read_packet %08lx\n", prot->handler, r.d[0], r.d[1], r.a[0], r.a[3], r.a[4]));
- Execute68k(prot->handler, &r);
- }
-
- // Acknowledge interrupt to reception thread
- D(bug(" EtherIRQ done\n"));
- sem_post(&int_ack);
- }
-