source: rtems/cpukit/libnetworking/rtems/rtems_glue.c @ 02aaec7

/*
 *  $Id$
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#define RTEMS_FAST_MUTEX

#ifdef RTEMS_FAST_MUTEX
#define __RTEMS_VIOLATE_KERNEL_VISIBILITY__ 1
#endif

#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>

#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/error.h>
#include <rtems/rtems_bsdnet.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/socketvar.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <vm/vm.h>
#include <arpa/inet.h>

#include <net/netisr.h>
#include <net/route.h>

/*
 * Sysctl init all.
 */
void sysctl_register_all(void *arg);

/*
 * Memory allocation
 */
static uint32_t nmbuf       = (64L * 1024L) / MSIZE;
       uint32_t nmbclusters = (128L * 1024L) / MCLBYTES;

/*
 * Network task synchronization
 */
static rtems_id networkSemaphore;
#ifdef RTEMS_FAST_MUTEX
Semaphore_Control   *the_networkSemaphore;
#endif
static rtems_id networkDaemonTid;
static uint32_t   networkDaemonPriority;
static void networkDaemon (void *task_argument);

/*
 * Network timing
 */
int                     rtems_bsdnet_ticks_per_second;
int                     rtems_bsdnet_microseconds_per_tick;

/*
 * Callout processing
 */
static rtems_interval   ticksWhenCalloutsLastChecked;
struct callout *callfree = NULL;
struct callout calltodo;

/*
 * FreeBSD variables
 */
int nfs_diskless_valid;

/*
 * BOOTP values
 */
struct in_addr rtems_bsdnet_log_host_address = {0};
struct in_addr rtems_bsdnet_bootp_server_address = {0};
char *rtems_bsdnet_bootp_boot_file_name = 0;
char *rtems_bsdnet_bootp_server_name = 0;
char *rtems_bsdnet_domain_name = 0;
char *rtems_bsdnet_bootp_cmdline = 0;
static struct in_addr _rtems_bsdnet_nameserver[sizeof rtems_bsdnet_config.name_server /
                        sizeof rtems_bsdnet_config.name_server[0]];
struct in_addr *rtems_bsdnet_nameserver = _rtems_bsdnet_nameserver;
int rtems_bsdnet_nameserver_count = 0;
static struct in_addr _rtems_bsdnet_ntpserver[sizeof rtems_bsdnet_config.ntp_server /
                        sizeof rtems_bsdnet_config.ntp_server[0]];
struct in_addr *rtems_bsdnet_ntpserver = _rtems_bsdnet_ntpserver;
int rtems_bsdnet_ntpserver_count = 0;
int32_t rtems_bsdnet_timeoffset = 0;

/*
 * Perform FreeBSD memory allocation.
 * FIXME: This should be modified to keep memory allocation statistics.
 */
#undef malloc
#undef free
extern void *malloc (size_t);
extern void free (void *);
void *
rtems_bsdnet_malloc (size_t size, int type, int flags)
{
        void *p;
        int try = 0;

        for (;;) {
                p = malloc (size);
                if (p || (flags & M_NOWAIT))
                        return p;
                rtems_bsdnet_semaphore_release ();
                if (++try >= 30) {
                        rtems_bsdnet_malloc_starvation();
                        try = 0;
                }
        rtems_task_wake_after (rtems_bsdnet_ticks_per_second);
                rtems_bsdnet_semaphore_obtain ();
        }
}

/*
 * Free FreeBSD memory
 * FIXME: This should be modified to keep memory allocation statistics.
 */
void
rtems_bsdnet_free (void *addr, int type)
{
        free (addr);
}

/*
 * Externs for BSD data we have to access during initialization
 */
extern struct domain routedomain;
extern struct domain inetdomain;

/*
 * Do the initializations required by the BSD code
 */
static int
bsd_init (void)
{
        int i;
        char *p;

        /*
         * Set up mbuf cluster data strutures
         */
        p = rtems_bsdnet_malloc_mbuf ((nmbclusters*MCLBYTES)+MCLBYTES-1, MBUF_MALLOC_NMBCLUSTERS);
        if (p == NULL) {
                printf ("Can't get network cluster memory.\n");
                return -1;
        }
        p = (char *)(((intptr_t)p + (MCLBYTES-1)) & ~(MCLBYTES-1));
        mbutl = (struct mbuf *)p;
        for (i = 0; i < nmbclusters; i++) {
                ((union mcluster *)p)->mcl_next = mclfree;
                mclfree = (union mcluster *)p;
                p += MCLBYTES;
                mbstat.m_clfree++;
        }
        mbstat.m_clusters = nmbclusters;
        mclrefcnt = rtems_bsdnet_malloc_mbuf (nmbclusters, MBUF_MALLOC_MCLREFCNT);
        if (mclrefcnt == NULL) {
                printf ("Can't get mbuf cluster reference counts memory.\n");
                return -1;
        }
        memset (mclrefcnt, '\0', nmbclusters);

        /*
         * Set up mbuf data structures
         */

        p = rtems_bsdnet_malloc_mbuf(nmbuf * MSIZE + MSIZE - 1,MBUF_MALLOC_MBUF);
        p = (char *)(((uintptr_t)p + MSIZE - 1) & ~(MSIZE - 1));
        if (p == NULL) {
                printf ("Can't get network memory.\n");
                return -1;
        }
        for (i = 0; i < nmbuf; i++) {
                ((struct mbuf *)p)->m_next = mmbfree;
                mmbfree = (struct mbuf *)p;
                p += MSIZE;
        }
        mbstat.m_mbufs = nmbuf;
        mbstat.m_mtypes[MT_FREE] = nmbuf;

        /*
         * Set up domains
         */
        {

        routedomain.dom_next = domains;
        domains = &routedomain;
        inetdomain.dom_next = domains;
        domains = &inetdomain;
        domaininit (NULL);
        }

  /*
   * Setup the sysctl, normally done by a SYSINIT call.
   */
  sysctl_register_all(0);

        /*
         * Set up interfaces
         */
        ifinit (NULL);
        return 0;
}

/*
 * RTEMS Specific Helper Routines
 */
extern void rtems_set_udp_buffer_sizes( u_long, u_long );
extern void rtems_set_tcp_buffer_sizes( u_long, u_long );
extern void rtems_set_sb_efficiency( u_long );

/*
 * Initialize and start network operations
 */
static int
rtems_bsdnet_initialize (void)
{
        rtems_status_code sc;

        /*
         * Set the priority of all network tasks
         */
        if (rtems_bsdnet_config.network_task_priority == 0)
                networkDaemonPriority = 100;
        else
                networkDaemonPriority = rtems_bsdnet_config.network_task_priority;

        /*
         * Set the memory allocation limits
         */
        if (rtems_bsdnet_config.mbuf_bytecount)
                nmbuf = rtems_bsdnet_config.mbuf_bytecount / MSIZE;
        if (rtems_bsdnet_config.mbuf_cluster_bytecount)
                nmbclusters = rtems_bsdnet_config.mbuf_cluster_bytecount / MCLBYTES;

        rtems_set_udp_buffer_sizes(
          rtems_bsdnet_config.udp_tx_buf_size,
          rtems_bsdnet_config.udp_rx_buf_size
        );

        rtems_set_tcp_buffer_sizes(
          rtems_bsdnet_config.tcp_tx_buf_size,
          rtems_bsdnet_config.tcp_rx_buf_size
        );

        rtems_set_sb_efficiency( rtems_bsdnet_config.sb_efficiency );

        /*
         * Create the task-synchronization semaphore
         */
        sc = rtems_semaphore_create (rtems_build_name('B', 'S', 'D', 'n'),
                                        0,
                                        RTEMS_PRIORITY |
                                                RTEMS_BINARY_SEMAPHORE |
                                                RTEMS_INHERIT_PRIORITY |
                                                RTEMS_NO_PRIORITY_CEILING |
                                                RTEMS_LOCAL,
                                        0,
                                        &networkSemaphore);
        if (sc != RTEMS_SUCCESSFUL) {
                printf ("Can't create network seamphore: `%s'\n", rtems_status_text (sc));
                return -1;
        }
#ifdef RTEMS_FAST_MUTEX
        {
        Objects_Locations location;
        the_networkSemaphore = _Semaphore_Get( networkSemaphore, &location );
        _Thread_Enable_dispatch();
        }
#endif

        /*
         * Compute clock tick conversion factors
         */
        rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &rtems_bsdnet_ticks_per_second);
        if (rtems_bsdnet_ticks_per_second <= 0)
                rtems_bsdnet_ticks_per_second = 1;
        rtems_bsdnet_microseconds_per_tick = 1000000 / rtems_bsdnet_ticks_per_second;

        /*
         * Ensure that `seconds' is greater than 0
         */
    while (rtems_bsdnet_seconds_since_boot() == 0)
        rtems_task_wake_after(1);

        /*
         * Set up BSD-style sockets
         */
        if (bsd_init () < 0)
                return -1;

        /*
         * Start network daemon
         */
        networkDaemonTid = rtems_bsdnet_newproc ("ntwk", 4096, networkDaemon, NULL);

        /*
         * Let other network tasks begin
         */
        rtems_bsdnet_semaphore_release ();
        return 0;
}

/*
 * Obtain network mutex
 */
void
rtems_bsdnet_semaphore_obtain (void)
{
#ifdef RTEMS_FAST_MUTEX
        ISR_Level level;
        _ISR_Disable (level);
        _CORE_mutex_Seize (
                &the_networkSemaphore->Core_control.mutex,
                networkSemaphore,
                1,              /* wait */
                0,              /* forever */
                level
                );
        if (_Thread_Executing->Wait.return_code)
                rtems_panic ("rtems-net: can't obtain network sema: %d\n",
                 _Thread_Executing->Wait.return_code);
#else
        rtems_status_code sc;

        sc = rtems_semaphore_obtain (networkSemaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("rtems-net: can't obtain network semaphore: `%s'\n",
                 rtems_status_text (sc));
#endif
}

/*
 * Release network mutex
 */
void
rtems_bsdnet_semaphore_release (void)
{
#ifdef RTEMS_FAST_MUTEX
        int i;

        _Thread_Disable_dispatch();
        i = _CORE_mutex_Surrender (
                &the_networkSemaphore->Core_control.mutex,
                networkSemaphore,
                NULL
                );
        _Thread_Enable_dispatch();
        if (i)
                rtems_panic ("rtems-net: can't release network sema: %i\n");
#else
        rtems_status_code sc;

        sc = rtems_semaphore_release (networkSemaphore);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("rtems-net: can't release network semaphore: `%s'\n",
                 rtems_status_text (sc));
#endif
}

/*
 * Wait for something to happen to a socket buffer
 */
int
sbwait(sb)
        struct sockbuf *sb;
{
        rtems_event_set events;
        rtems_id tid;
        rtems_status_code sc;

        /*
         * Soak up any pending events.
         * The sleep/wakeup synchronization in the FreeBSD
         * kernel has no memory.
         */
        rtems_event_receive (SBWAIT_EVENT, RTEMS_EVENT_ANY | RTEMS_NO_WAIT, RTEMS_NO_TIMEOUT, &events);

        /*
         * Set this task as the target of the wakeup operation.
         */
        rtems_task_ident (RTEMS_SELF, 0, &tid);
        sb->sb_sel.si_pid = tid;

        /*
         * Show that socket is waiting
         */
        sb->sb_flags |= SB_WAIT;

        /*
         * Release the network semaphore.
         */
        rtems_bsdnet_semaphore_release ();

        /*
         * Wait for the wakeup event.
         */
        sc = rtems_event_receive (SBWAIT_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, sb->sb_timeo, &events);

        /*
         * Reobtain the network semaphore.
         */
        rtems_bsdnet_semaphore_obtain ();

        /*
         * Return the status of the wait.
         */
        switch (sc) {
        case RTEMS_SUCCESSFUL:  return 0;
        case RTEMS_TIMEOUT:     return EWOULDBLOCK;
        default:                return ENXIO;
        }
}


/*
 * Wake up the task waiting on a socket buffer.
 */
void
sowakeup(so, sb)
        register struct socket *so;
        register struct sockbuf *sb;
{
        if (sb->sb_flags & SB_WAIT) {
                sb->sb_flags &= ~SB_WAIT;
                rtems_event_send (sb->sb_sel.si_pid, SBWAIT_EVENT);
        }
        if (sb->sb_wakeup) {
                (*sb->sb_wakeup) (so, sb->sb_wakeuparg);
        }
}

/*
 * For now, a socket can be used by only one task at a time.
 */
int
sb_lock(sb)
        register struct sockbuf *sb;
{
        rtems_panic ("Socket buffer is already in use.");
        return 0;
}
void
wakeup (void *p)
{
        rtems_panic ("Wakeup called");
}

/*
 * Wait for a connection/disconnection event.
 */
int
soconnsleep (struct socket *so)
{
        rtems_event_set events;
        rtems_id tid;
        rtems_status_code sc;

        /*
         * Soak up any pending events.
         * The sleep/wakeup synchronization in the FreeBSD
         * kernel has no memory.
         */
        rtems_event_receive (SOSLEEP_EVENT, RTEMS_EVENT_ANY | RTEMS_NO_WAIT, RTEMS_NO_TIMEOUT, &events);

        /*
         * Set this task as the target of the wakeup operation.
         */
        if (so->so_pgid)
                rtems_panic ("Another task is already sleeping on that socket");
        rtems_task_ident (RTEMS_SELF, 0, &tid);
        so->so_pgid = tid;

        /*
         * Wait for the wakeup event.
         */
        sc = rtems_bsdnet_event_receive (SOSLEEP_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, so->so_rcv.sb_timeo, &events);

        /*
         * Relinquish ownership of the socket.
         */
        so->so_pgid = 0;

        switch (sc) {
        case RTEMS_SUCCESSFUL:  return 0;
        case RTEMS_TIMEOUT:     return EWOULDBLOCK;
        default:                return ENXIO;
        }
}

/*
 * Wake up a task waiting for a connection/disconnection to complete.
 */
void
soconnwakeup (struct socket *so)
{
        if (so->so_pgid)
                rtems_event_send (so->so_pgid, SOSLEEP_EVENT);
}

/*
 * Send an event to the network daemon.
 * This corresponds to sending a software interrupt in the BSD kernel.
 */
void
rtems_bsdnet_schednetisr (int n)
{
        rtems_event_send (networkDaemonTid, 1 << n);
}

/*
 * The network daemon
 * This provides a context to run BSD software interrupts
 */
static void
networkDaemon (void *task_argument)
{
        rtems_status_code sc;
        rtems_event_set events;
        rtems_interval now;
        int ticksPassed;
        uint32_t   timeout;
        struct callout *c;

        for (;;) {
                c = calltodo.c_next;
                if (c)
                        timeout = c->c_time;
                else
                        timeout = RTEMS_NO_TIMEOUT;

                sc = rtems_bsdnet_event_receive (NETISR_EVENTS,
                                                RTEMS_EVENT_ANY | RTEMS_WAIT,
                                                timeout,
                                                &events);
                if ( sc == RTEMS_SUCCESSFUL ) {
                        if (events & NETISR_IP_EVENT)
                                ipintr ();
                        if (events & NETISR_ARP_EVENT)
                                arpintr ();
                }

                rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
                ticksPassed = now - ticksWhenCalloutsLastChecked;
                if (ticksPassed != 0) {
                        ticksWhenCalloutsLastChecked = now;

                        c = calltodo.c_next;
                        if (c) {
                                c->c_time -= ticksPassed;
                                while ((c = calltodo.c_next) != NULL && c->c_time <= 0) {
                                        void *arg;
                                        void (*func) (void *);

                                        func = c->c_func;
                                        arg = c->c_arg;
                                        calltodo.c_next = c->c_next;
                                        c->c_next = callfree;
                                        callfree = c;
                                        (*func)(arg);
                                }
                        }
                }
        }
}

/*
 * Structure passed to task-start stub
 */
struct newtask {
        void (*entry)(void *);
        void *arg;
};

/*
 * Task-start stub
 */
static void
taskEntry (rtems_task_argument arg)
{
        struct newtask t;

        /*
         * Pick up task information and free
         * the memory allocated to pass the
         * information to this task.
         */
        t = *(struct newtask *)arg;
        free ((struct newtask *)arg);

        /*
         * Enter the competition for the network semaphore
         */
        rtems_bsdnet_semaphore_obtain ();

        /*
         * Enter the task
         */
        (*t.entry)(t.arg);
        rtems_panic ("Network task returned!\n");
}

/*
 * Start a network task
 */
rtems_id
rtems_bsdnet_newproc (char *name, int stacksize, void(*entry)(void *), void *arg)
{
        struct newtask *t;
        char nm[4];
        rtems_id tid;
        rtems_status_code sc;

        strncpy (nm, name, 4);
        sc = rtems_task_create (rtems_build_name(nm[0], nm[1], nm[2], nm[3]),
                networkDaemonPriority,
                stacksize,
                RTEMS_PREEMPT|RTEMS_NO_TIMESLICE|RTEMS_NO_ASR|RTEMS_INTERRUPT_LEVEL(0),
                RTEMS_NO_FLOATING_POINT|RTEMS_LOCAL,
                &tid);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("Can't create network daemon `%s': `%s'\n", name, rtems_status_text (sc));

        /*
         * Set up task arguments
         */
        t = malloc (sizeof *t);
        t->entry = entry;
        t->arg = arg;

        /*
         * Start the task
         */
        sc = rtems_task_start (tid, taskEntry, (rtems_task_argument)t);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("Can't start network daemon `%s': `%s'\n", name, rtems_status_text (sc));

        /*
         * Let our caller know the i.d. of the new task
         */
        return tid;
}

rtems_status_code rtems_bsdnet_event_receive (
  rtems_event_set  event_in,
  rtems_option     option_set,
  rtems_interval   ticks,
  rtems_event_set *event_out)
{
        rtems_status_code sc;

        rtems_bsdnet_semaphore_release ();
        sc = rtems_event_receive (event_in, option_set, ticks, event_out);
        rtems_bsdnet_semaphore_obtain ();
        return sc;
}

/*
 * Return time since startup
 */
void
microtime (struct timeval *t)
{
        rtems_interval now;

        rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
        t->tv_sec = now / rtems_bsdnet_ticks_per_second;
        t->tv_usec = (now % rtems_bsdnet_ticks_per_second) * rtems_bsdnet_microseconds_per_tick;
}

unsigned long
rtems_bsdnet_seconds_since_boot (void)
{
        rtems_interval now;

        rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
        return now / rtems_bsdnet_ticks_per_second;
}

/*
 * Fake random number generator
 */
unsigned long
rtems_bsdnet_random (void)
{
        rtems_interval now;

        rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
        return (now * 99991);
}

/*
 * Callout list processing
 */
void
rtems_bsdnet_timeout(void (*ftn)(void *), void *arg, int ticks)
{
        register struct callout *new, *p, *t;

        if (ticks <= 0)
                ticks = 1;

        /* Fill in the next free callout structure. */
        if (callfree == NULL) {
                callfree = malloc (sizeof *callfree);
                if (callfree == NULL)
                        rtems_panic ("No memory for timeout table entry");
                callfree->c_next = NULL;
        }

        new = callfree;
        callfree = new->c_next;
        new->c_arg = arg;
        new->c_func = ftn;

        /*
         * The time for each event is stored as a difference from the time
         * of the previous event on the queue.  Walk the queue, correcting
         * the ticks argument for queue entries passed.  Correct the ticks
         * value for the queue entry immediately after the insertion point
         * as well.  Watch out for negative c_time values; these represent
         * overdue events.
         */
        for (p = &calltodo;
            (t = p->c_next) != NULL && ticks > t->c_time; p = t)
                if (t->c_time > 0)
                        ticks -= t->c_time;
        new->c_time = ticks;
        if (t != NULL)
                t->c_time -= ticks;

        /* Insert the new entry into the queue. */
        p->c_next = new;
        new->c_next = t;
}

/*
 * Ticks till specified time
 * XXX: This version worries only about seconds, but that's good
 * enough for the way the network code uses this routine.
 */
int
hzto(struct timeval *tv)
{
        long diff = tv->tv_sec - rtems_bsdnet_seconds_since_boot();

        if (diff <= 0)
                return 1;
        return diff * rtems_bsdnet_ticks_per_second;
}

/*
 * Kernel debugging
 */
int rtems_bsdnet_log_priority;
void
rtems_bsdnet_log (int priority, const char *fmt, ...)
{
        va_list args;

        if (priority & rtems_bsdnet_log_priority) {
                va_start (args, fmt);
                vprintf (fmt, args);
                va_end (args);
        }
}

/*
 * IP header checksum routine for processors which don't have an inline version
 */
u_int
in_cksum_hdr (const void *ip)
{
        uint32_t   sum;
        const uint16_t   *sp;
        int i;

        sum = 0;
        sp = (uint16_t   *)ip;
        for (i = 0 ; i < 10 ; i++)
                sum += *sp++;
        while (sum > 0xFFFF)
                sum = (sum & 0xffff) + (sum >> 16);
        return ~sum & 0xFFFF;
}

/*
 * Manipulate routing tables
 */
int rtems_bsdnet_rtrequest (
    int req,
    struct sockaddr *dst,
    struct sockaddr *gateway,
    struct sockaddr *netmask,
    int flags,
    struct rtentry **net_nrt)
{
        int error;

        rtems_bsdnet_semaphore_obtain ();
        error = rtrequest (req, dst, gateway, netmask, flags, net_nrt);
        rtems_bsdnet_semaphore_release ();
        if (error) {
                errno = error;
                return -1;
        }
        return 0;
}

static int
rtems_bsdnet_setup (void)
{
        struct rtems_bsdnet_ifconfig *ifp;
        short flags;
        struct sockaddr_in address;
        struct sockaddr_in netmask;
        struct sockaddr_in broadcast;
        struct sockaddr_in gateway;
        int i;
        int any_if_configured = 0;

        /*
         * Set local parameters
         */
        if (rtems_bsdnet_config.hostname)
                sethostname (rtems_bsdnet_config.hostname,
                                        strlen (rtems_bsdnet_config.hostname));
        if (rtems_bsdnet_config.domainname)
                rtems_bsdnet_domain_name =
                                        strdup (rtems_bsdnet_config.domainname);
        if (rtems_bsdnet_config.log_host)
                rtems_bsdnet_log_host_address.s_addr =
                                inet_addr (rtems_bsdnet_config.log_host);
        for (i = 0 ; i < sizeof rtems_bsdnet_config.name_server /
                        sizeof rtems_bsdnet_config.name_server[0] ; i++) {
                if (!rtems_bsdnet_config.name_server[i])
                        break;
                rtems_bsdnet_nameserver[rtems_bsdnet_nameserver_count++].s_addr
                        = inet_addr (rtems_bsdnet_config.name_server[i]);
        }
        for (i = 0 ; i < sizeof rtems_bsdnet_config.ntp_server /
                        sizeof rtems_bsdnet_config.ntp_server[0] ; i++) {
                if (!rtems_bsdnet_config.ntp_server[i])
                        break;
                rtems_bsdnet_ntpserver[rtems_bsdnet_ntpserver_count++].s_addr
                        = inet_addr (rtems_bsdnet_config.ntp_server[i]);
        }

        /*
         * Configure interfaces
         */
        for (ifp = rtems_bsdnet_config.ifconfig ; ifp ; ifp = ifp->next) {
                if (ifp->ip_address == NULL)
                        continue;

                /*
                 * Bring interface up
                 */
                flags = IFF_UP;
                if (rtems_bsdnet_ifconfig (ifp->name, SIOCSIFFLAGS, &flags) < 0) {
                        printf ("Can't bring %s up: %s\n", ifp->name, strerror (errno));
                        continue;
                }

                /*
                 * Set interface netmask
                 */
                memset (&netmask, '\0', sizeof netmask);
                netmask.sin_len = sizeof netmask;
                netmask.sin_family = AF_INET;
                netmask.sin_addr.s_addr = inet_addr (ifp->ip_netmask);
                if (rtems_bsdnet_ifconfig (ifp->name, SIOCSIFNETMASK, &netmask) < 0) {
                        printf ("Can't set %s netmask: %s\n", ifp->name, strerror (errno));
                        continue;
                }

                /*
                 * Set interface address
                 */
                memset (&address, '\0', sizeof address);
                address.sin_len = sizeof address;
                address.sin_family = AF_INET;
                address.sin_addr.s_addr = inet_addr (ifp->ip_address);
                if (rtems_bsdnet_ifconfig (ifp->name, SIOCSIFADDR, &address) < 0) {
                        printf ("Can't set %s address: %s\n", ifp->name, strerror (errno));
                        continue;
                }

                /*
                 * Set interface broadcast address if the interface has the
                 * broadcast flag set.
                 */
                if (rtems_bsdnet_ifconfig (ifp->name, SIOCGIFFLAGS, &flags) < 0) {
                        printf ("Can't read %s flags: %s\n", ifp->name, strerror (errno));
                        continue;
                }

                any_if_configured = 1;

                if (flags & IFF_BROADCAST) {
                        memset (&broadcast, '\0', sizeof broadcast);
                        broadcast.sin_len = sizeof broadcast;
                        broadcast.sin_family = AF_INET;
                        broadcast.sin_addr.s_addr =
                                        address.sin_addr.s_addr | ~netmask.sin_addr.s_addr;
                        if (rtems_bsdnet_ifconfig (ifp->name, SIOCSIFBRDADDR, &broadcast) < 0) {
                                struct in_addr  in_addr;
                                char                    buf[20];
                                in_addr.s_addr = broadcast.sin_addr.s_addr;
                                if (!inet_ntop(AF_INET, &in_addr, buf, sizeof(buf)))
                                                strcpy(buf,"?.?.?.?");
                                printf ("Can't set %s broadcast address %s: %s\n",
                                        ifp->name, buf, strerror (errno));
                        }
                }
        }

        /*
         * Set default route
         */
        if (rtems_bsdnet_config.gateway && any_if_configured) {
                address.sin_addr.s_addr = INADDR_ANY;
                netmask.sin_addr.s_addr = INADDR_ANY;
                memset (&gateway, '\0', sizeof gateway);
                gateway.sin_len = sizeof gateway;
                gateway.sin_family = AF_INET;
                gateway.sin_addr.s_addr = inet_addr (rtems_bsdnet_config.gateway);
                if (rtems_bsdnet_rtrequest (
                                RTM_ADD,
                                (struct sockaddr *)&address,
                                (struct sockaddr *)&gateway,
                                (struct sockaddr *)&netmask,
                                (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL) < 0) {
                        printf ("Can't set default route: %s\n", strerror (errno));
                        return -1;
                }
        }
        return 0;
}

/*
 * Initialize the network
 */
int
rtems_bsdnet_initialize_network (void)
{
        struct rtems_bsdnet_ifconfig *ifp;

        /*
         * Start network tasks.
         * Initialize BSD network data structures.
         */
        if (rtems_bsdnet_initialize () < 0)
                return -1;

        /*
         * Attach interfaces
         */
        for (ifp = rtems_bsdnet_config.ifconfig ; ifp ; ifp = ifp->next) {
                rtems_bsdnet_attach (ifp);
        }

        /*
         * Bring up the network
         */
        if (rtems_bsdnet_setup () < 0)
                return -1;
        if (rtems_bsdnet_config.bootp)
                (*rtems_bsdnet_config.bootp)();
        return 0;
}

/*
 * Attach a network interface.
 */
void rtems_bsdnet_attach (struct rtems_bsdnet_ifconfig *ifp)
{
        if (ifp) {
                rtems_bsdnet_semaphore_obtain ();
                (ifp->attach)(ifp, 1);
                rtems_bsdnet_semaphore_release ();
        }
}

/*
 * Detach a network interface.
 */
void rtems_bsdnet_detach (struct rtems_bsdnet_ifconfig *ifp)
{
        if (ifp) {
                rtems_bsdnet_semaphore_obtain ();
                (ifp->attach)(ifp, 0);
                rtems_bsdnet_semaphore_release ();
        }
}

/*
 * Interface Configuration.
 */
int rtems_bsdnet_ifconfig (const char *ifname, uint32_t   cmd, void *param)
{
        int s, r = 0;
        struct ifreq ifreq;

        /*
         * Configure interfaces
         */
        s = socket (AF_INET, SOCK_DGRAM, 0);
        if (s < 0)
                return -1;

        strncpy (ifreq.ifr_name, ifname, IFNAMSIZ);

        rtems_bsdnet_semaphore_obtain ();

        switch (cmd) {
                case SIOCSIFADDR:
                case SIOCSIFNETMASK:
                        memcpy (&ifreq.ifr_addr, param, sizeof (struct sockaddr));
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case OSIOCGIFADDR:
                case SIOCGIFADDR:
                case OSIOCGIFNETMASK:
                case SIOCGIFNETMASK:
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        memcpy (param, &ifreq.ifr_addr, sizeof (struct sockaddr));
                        break;

                case SIOCGIFFLAGS:
                case SIOCSIFFLAGS:
                        if ((r = ioctl (s, SIOCGIFFLAGS, &ifreq)) < 0)
                                break;
                        if (cmd == SIOCGIFFLAGS) {
                                *((short*) param) = ifreq.ifr_flags;
                                break;
                        }
                        ifreq.ifr_flags |= *((short*) param);
                        if ( (*((short*) param) & IFF_UP ) == 0 ) {
                            /* set the interface down */
                            ifreq.ifr_flags &= ~(IFF_UP);
                        }
                        r = ioctl (s, SIOCSIFFLAGS, &ifreq);
                        break;

                case SIOCSIFDSTADDR:
                        memcpy (&ifreq.ifr_dstaddr, param, sizeof (struct sockaddr));
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case OSIOCGIFDSTADDR:
                case SIOCGIFDSTADDR:
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        memcpy (param, &ifreq.ifr_dstaddr, sizeof (struct sockaddr));
                        break;

                case SIOCSIFBRDADDR:
                        memcpy (&ifreq.ifr_broadaddr, param, sizeof (struct sockaddr));
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case OSIOCGIFBRDADDR:
                case SIOCGIFBRDADDR:
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        memcpy (param, &ifreq.ifr_broadaddr, sizeof (struct sockaddr));
                        break;

                case SIOCSIFMETRIC:
                        ifreq.ifr_metric = *((int*) param);
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case SIOCGIFMETRIC:
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        *((int*) param) = ifreq.ifr_metric;
                        break;

                case SIOCSIFMTU:
                        ifreq.ifr_mtu = *((int*) param);
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case SIOCGIFMTU:
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        *((int*) param) = ifreq.ifr_mtu;
                        break;

                case SIOCSIFPHYS:
                        ifreq.ifr_phys = *((int*) param);
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case SIOCGIFPHYS:
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        *((int*) param) = ifreq.ifr_phys;
                        break;

                case SIOCSIFMEDIA:
                        ifreq.ifr_media = *((int*) param);
                        r = ioctl (s, cmd, &ifreq);
                        break;

                case SIOCGIFMEDIA:
                        /* 'param' passes the phy index they want to
                         * look at...
                         */
                        ifreq.ifr_media = *((int*) param);
                        if ((r = ioctl (s, cmd, &ifreq)) < 0)
                                break;
                        *((int*) param) = ifreq.ifr_media;
                        break;

                case SIOCAIFADDR:
                case SIOCDIFADDR:
                        r = ioctl(s, cmd, (struct ifreq *) param);
                        break;

                default:
                        errno = EOPNOTSUPP;
                        r = -1;
                        break;
        }

        rtems_bsdnet_semaphore_release ();

        close (s);
        return r;
}

/*
 * Parse a network driver name into a name and a unit number
 */
int
rtems_bsdnet_parse_driver_name (const struct rtems_bsdnet_ifconfig *config, char **namep)
{
        const char *cp = config->name;
        char c;
        int unitNumber = 0;

        if (cp == NULL) {
                printf ("No network driver name.\n");
                return -1;
        }
        while ((c = *cp++) != '\0') {
                if ((c >= '0') && (c <= '9')) {
                        int len = cp - config->name;
                        if ((len < 2) || (len > 50))
                                break;
                        for (;;) {
                                unitNumber = (unitNumber * 10) + (c - '0');
                                c = *cp++;
                                if (c == '\0') {
                                        char *unitName = malloc (len);
                                        if (unitName == NULL) {
                                                printf ("No memory.\n");
                                                return -1;
                                        }
                                        strncpy (unitName, config->name, len - 1);
                                        unitName[len-1] = '\0';
                                        *namep = unitName;
                                        return unitNumber;
                                }
                                if ((c < '0') || (c > '9'))
                                        break;
                        }
                        break;
                }
        }
        printf ("Bad network driver name `%s'.\n", config->name);
        return -1;
}

/*
 * Handle requests for more network memory
 * XXX: Another possibility would be to use a semaphore here with
 *      a release in the mbuf free macro.  I have chosen this `polling'
 *      approach because:
 *      1) It is simpler.
 *      2) It adds no complexity to the free macro.
 *      3) Running out of mbufs should be a rare
 *         condition -- predeployment testing of
 *         an application should indicate the
 *         required mbuf pool size.
 * XXX: Should there be a panic if a task is stuck in the loop for
 *      more than a minute or so?
 */
int
m_mballoc (int nmb, int nowait)
{
        if (nowait)
                return 0;
        m_reclaim ();
        if (mmbfree == NULL) {
                int try = 0;
                int print_limit = 30 * rtems_bsdnet_ticks_per_second;

                mbstat.m_wait++;
                for (;;) {
                        rtems_bsdnet_semaphore_release ();
                        rtems_task_wake_after (1);
                        rtems_bsdnet_semaphore_obtain ();
                        if (mmbfree)
                                break;
                        if (++try >= print_limit) {
                                printf ("Still waiting for mbuf.\n");
                                try = 0;
                        }
                }
        }
        else {
                mbstat.m_drops++;
        }
        return 1;
}

int
m_clalloc(ncl, nowait)
{
        if (nowait)
                return 0;
        m_reclaim ();
        if (mclfree == NULL) {
                int try = 0;
                int print_limit = 30 * rtems_bsdnet_ticks_per_second;

                mbstat.m_wait++;
                for (;;) {
                        rtems_bsdnet_semaphore_release ();
                        rtems_task_wake_after (1);
                        rtems_bsdnet_semaphore_obtain ();
                        if (mclfree)
                                break;
                        if (++try >= print_limit) {
                                printf ("Still waiting for mbuf cluster.\n");
                                try = 0;
                        }
                }
        }
        else {
                mbstat.m_drops++;
        }
        return 1;
}