416 lines
9 KiB
C
416 lines
9 KiB
C
/* this file contains the interface of the network software with rest of
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minix. Furthermore it contains the main loop of the network task.
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Copyright 1995 Philip Homburg
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The valid messages and their parameters are:
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from FS:
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__________________________________________________________________
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| m_type | DEVICE | PROC_NR | COUNT | POSITION | ADDRESS |
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|_______________|___________|_________|_______|__________|_________|
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| | | | | | |
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| DEV_OPEN | minor dev | proc nr | mode | | |
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|_______________|___________|_________|_______|__________|_________|
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| | | | | | |
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| DEV_CLOSE | minor dev | proc nr | | | |
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|_______________|___________|_________|_______|__________|_________|
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| | | | | | |
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| DEV_IOCTL_S | minor dev | proc nr | | NWIO.. | address |
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|_______________|___________|_________|_______|__________|_________|
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| | | | | | |
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| DEV_READ_S | minor dev | proc nr | count | | address |
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|_______________|___________|_________|_______|__________|_________|
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| | | | | | |
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| DEV_WRITE_S | minor dev | proc nr | count | | address |
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|_______________|___________|_________|_______|__________|_________|
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| | | | | | |
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| CANCEL | minor dev | proc nr | | | |
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|_______________|___________|_________|_______|__________|_________|
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from DL_ETH:
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(not documented here)
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*/
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#include "inet.h"
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#define _MINIX_SOURCE 1
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/svrctl.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/chardriver.h>
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#include <minix/rs.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include "mq.h"
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#include "qp.h"
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#include "proto.h"
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#include "generic/type.h"
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#include "generic/arp.h"
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#include "generic/assert.h"
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#include "generic/buf.h"
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#include "generic/clock.h"
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#include "generic/eth.h"
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#include "generic/event.h"
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#include "generic/ip.h"
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#include "generic/psip.h"
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#include "generic/rand256.h"
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#include "generic/sr.h"
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#include "generic/tcp.h"
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#include "generic/udp.h"
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THIS_FILE
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#define RANDOM_DEV_NAME "/dev/random"
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endpoint_t this_proc; /* Process number of this server. */
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/* Killing Solaris */
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int killer_inet= 0;
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#ifdef BUF_CONSISTENCY_CHECK
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extern int inet_buf_debug;
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#endif
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#if HZ_DYNAMIC
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u32_t system_hz;
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#endif
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static void nw_conf(void);
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static void nw_init(void);
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static void ds_event(void);
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/* SEF functions and variables. */
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static void sef_local_startup(void);
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static int sef_cb_init_fresh(int type, sef_init_info_t *info);
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int main(int argc, char *argv[])
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{
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mq_t *mq;
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int ipc_status;
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int r;
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endpoint_t source;
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int m_type;
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/* SEF local startup. */
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sef_local_startup();
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while (TRUE)
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{
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#ifdef BUF_CONSISTENCY_CHECK
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if (inet_buf_debug)
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{
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static int buf_debug_count= 0;
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if (++buf_debug_count >= inet_buf_debug)
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{
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buf_debug_count= 0;
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if (!bf_consistency_check())
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break;
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}
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}
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#endif
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if (ev_head)
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{
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ev_process();
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continue;
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}
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if (clck_call_expire)
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{
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clck_expire_timers();
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continue;
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}
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mq= mq_get();
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if (!mq)
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ip_panic(("out of messages"));
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r= sef_receive_status(ANY, &mq->mq_mess, &ipc_status);
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if (r<0)
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{
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ip_panic(("unable to receive: %d", r));
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}
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reset_time();
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source= mq->mq_mess.m_source;
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m_type= mq->mq_mess.m_type;
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if (source == VFS_PROC_NR)
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{
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sr_rec(mq);
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}
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else if (is_ipc_notify(ipc_status))
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{
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if (source == CLOCK)
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{
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clck_tick(&mq->mq_mess);
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mq_free(mq);
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}
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else if (source == PM_PROC_NR)
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{
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/* signaled */
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/* probably SIGTERM */
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mq_free(mq);
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}
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else if (source == DS_PROC_NR)
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{
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/* DS notifies us of an event. */
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ds_event();
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mq_free(mq);
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}
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else
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{
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printf("inet: got unexpected notify from %d\n",
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mq->mq_mess.m_source);
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mq_free(mq);
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}
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}
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else if (m_type == DL_CONF_REPLY || m_type == DL_TASK_REPLY ||
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m_type == DL_STAT_REPLY)
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{
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eth_rec(&mq->mq_mess);
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mq_free(mq);
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}
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else
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{
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printf("inet: got bad message type 0x%x from %d\n",
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mq->mq_mess.m_type, mq->mq_mess.m_source);
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mq_free(mq);
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}
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}
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ip_panic(("task is not allowed to terminate"));
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return 1;
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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static void sef_local_startup()
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{
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/* Register init callbacks. */
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sef_setcb_init_fresh(sef_cb_init_fresh);
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sef_setcb_init_restart(sef_cb_init_fresh);
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/* No live update support for now. */
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/* Let SEF perform startup. */
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sef_startup();
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}
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/*===========================================================================*
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* sef_cb_init_fresh *
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*===========================================================================*/
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static int sef_cb_init_fresh(int type, sef_init_info_t *info)
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{
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/* Initialize the inet server. */
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int r;
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int timerand, fd;
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u8_t randbits[32];
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struct timeval tv;
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struct passwd *pw;
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#if DEBUG
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printf("Starting inet...\n");
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printf("%s\n", version);
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#endif
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#if HZ_DYNAMIC
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system_hz = sys_hz();
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#endif
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/* Read configuration. */
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nw_conf();
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/* Get a random number */
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timerand= 1;
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fd= open(RANDOM_DEV_NAME, O_RDONLY | O_NONBLOCK);
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if (fd != -1)
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{
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r= read(fd, randbits, sizeof(randbits));
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if (r == sizeof(randbits))
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timerand= 0;
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else
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{
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printf("inet: unable to read random data from %s: %s\n",
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RANDOM_DEV_NAME, r == -1 ? strerror(errno) :
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r == 0 ? "EOF" : "not enough data");
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}
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close(fd);
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}
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else
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{
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printf("inet: unable to open random device %s: %s\n",
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RANDOM_DEV_NAME, strerror(errno));
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}
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if (timerand)
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{
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printf("inet: using current time for random-number seed\n");
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r= gettimeofday(&tv, NULL);
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if (r == -1)
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{
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printf("sysutime failed: %s\n", strerror(errno));
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exit(1);
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}
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memcpy(randbits, &tv, sizeof(tv));
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}
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init_rand256(randbits);
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/* Our new identity as a server. */
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this_proc= info->endpoint;
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#ifdef BUF_CONSISTENCY_CHECK
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inet_buf_debug= (getenv("inetbufdebug") &&
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(strcmp(getenv("inetbufdebug"), "on") == 0));
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inet_buf_debug= 100;
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if (inet_buf_debug)
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{
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ip_warning(( "buffer consistency check enabled" ));
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}
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#endif
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if (getenv("killerinet"))
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{
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ip_warning(( "killer inet active" ));
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killer_inet= 1;
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}
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nw_init();
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/* Subscribe to driver events for network drivers. */
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r = ds_subscribe("drv\\.net\\..*", DSF_INITIAL | DSF_OVERWRITE);
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if(r != OK) {
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ip_panic(("inet: can't subscribe to driver events"));
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}
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/* Drop root privileges */
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if ((pw = getpwnam(SERVICE_LOGIN)) == NULL) {
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printf("inet: unable to retrieve uid of SERVICE_LOGIN, "
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"still running as root");
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} else if (setuid(pw->pw_uid) != 0) {
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ip_panic(("inet: unable to drop privileges"));
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}
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/* Announce we are up. INET announces its presence to VFS just like
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* any other character driver.
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*/
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chardriver_announce();
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return(OK);
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}
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static void nw_conf()
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{
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read_conf();
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eth_prep();
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arp_prep();
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psip_prep();
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ip_prep();
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tcp_prep();
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udp_prep();
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}
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static void nw_init()
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{
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mq_init();
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bf_init();
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clck_init();
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sr_init();
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qp_init();
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eth_init();
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arp_init();
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psip_init();
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ip_init();
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tcp_init();
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udp_init();
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}
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/*===========================================================================*
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* ds_event *
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*===========================================================================*/
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static void ds_event()
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{
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char key[DS_MAX_KEYLEN];
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char *driver_prefix = "drv.net.";
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char *label;
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u32_t value;
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int type;
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endpoint_t owner_endpoint;
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int r;
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int prefix_len;
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prefix_len = strlen(driver_prefix);
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/* We may get one notification for multiple updates from DS. Get events
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* and owners from DS, until DS tells us that there are no more.
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*/
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while ((r = ds_check(key, &type, &owner_endpoint)) == OK) {
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r = ds_retrieve_u32(key, &value);
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if(r != OK) {
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printf("inet: ds_event: ds_retrieve_u32 failed\n");
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return;
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}
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/* Only check for network driver up events. */
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if(strncmp(key, driver_prefix, prefix_len)
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|| value != DS_DRIVER_UP) {
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return;
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}
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/* The driver label comes after the prefix. */
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label = key + prefix_len;
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/* A driver is (re)started. */
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eth_check_driver(label, owner_endpoint);
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}
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if(r != ENOENT)
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printf("inet: ds_event: ds_check failed: %d\n", r);
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}
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void panic0(file, line)
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char *file;
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int line;
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{
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printf("panic at %s, %d: ", file, line);
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}
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void inet_panic()
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{
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printf("\ninet stacktrace: ");
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util_stacktrace();
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(panic)("aborted due to a panic");
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for(;;);
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}
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#if !NDEBUG
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void bad_assertion(file, line, what)
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char *file;
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int line;
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char *what;
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{
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panic0(file, line);
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printf("assertion \"%s\" failed", what);
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panic();
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}
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void bad_compare(file, line, lhs, what, rhs)
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char *file;
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int line;
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int lhs;
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char *what;
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int rhs;
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{
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panic0(file, line);
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printf("compare (%d) %s (%d) failed", lhs, what, rhs);
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panic();
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}
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#endif /* !NDEBUG */
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/*
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* $PchId: inet.c,v 1.23 2005/06/28 14:27:22 philip Exp $
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*/
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