minix/servers/inet/inet.c
David van Moolenbroek 9ba65d2ea8 This patch switches the MINIX3 ethernet driver stack from a port-based
model to an instance-based model. Each ethernet driver instance is now
responsible for exactly one network interface card. The port field in
/etc/inet.conf now acts as an instance field instead.

This patch also updates the data link protocol. This update:
- eliminates the concept of ports entirely;
- eliminates DL_GETNAME entirely;
- standardizes on using m_source for IPC and DL_ENDPT for safecopies;
- removes error codes from TASK/STAT replies, as they were unused;
- removes a number of other old or unused fields;
- names and renames a few other fields.

All ethernet drivers have been changed to:
- conform to the new protocol, and exactly that;
- take on an instance number based on a given "instance" argument;
- skip that number of PCI devices in probe iterations;
- use config tables and environment variables based on that number;
- no longer be limited to a predefined maximum of cards in any way;
- get rid of any leftover non-safecopy support and other ancient junk;
- have a correct banner protocol figure, or none at all.

Other changes:
* Inet.conf is now taken to be line-based, and supports #-comments.
  No existing installations are expected to be affected by this.
* A new, select-based asynchio library replaces the old one.
  Kindly contributed by Kees J. Bot.
* Inet now supports use of select() on IP devices.
  Combined, the last two changes together speed up dhcpd
  considerably in the presence of multiple interfaces.
* A small bug has been fixed in nonamed.
2010-05-17 22:22:53 +00:00

407 lines
8.9 KiB
C

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