source: rtems/c/src/libnetworking/rtems/rtems_glue.c @ cca4400

/*
 *  $Id$
 */

#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>

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

/*
 * Socket buffering parameters
 */
unsigned long sb_efficiency = 8;

/*
 * Network task synchronization
 */
static rtems_id networkSemaphore;
static rtems_id networkDaemonTid;
static rtems_unsigned32 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;
static struct callout *callfree, calltodo;

/*
 * FreeBSD variables
 */
int nfs_diskless_valid;

/*
 * BOOTP values
 */
struct in_addr rtems_bsdnet_log_host_address;
struct in_addr rtems_bsdnet_bootp_server_address;
char *rtems_bsdnet_bootp_boot_file_name;
char *rtems_bsdnet_bootp_server_name;
char *rtems_bsdnet_domain_name;
struct in_addr rtems_bsdnet_nameserver[sizeof rtems_bsdnet_config.name_server /
                        sizeof rtems_bsdnet_config.name_server[0]];
int rtems_bsdnet_nameserver_count;

extern rtems_libio_handler_t rtems_bsdnet_io_handler;

/*
 * 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 (unsigned long size, int type, int flags)
{
        void *p;

        for (;;) {
                p = malloc (size);
                if (p)
                        return p;
                if (flags & M_NOWAIT)
                        return p;
                /*
                 * FIXME: This should be redone as:
                 * static volatile int rtems_bsdnet_need_memory;
                 *     
                 *      rtems_bsdnet_need_memory = 1;
                 *      message_queue_receive
                 *
                 * Then in rtems_bsdnet_freee:
                 *      free (....);
                 *      if (rtems_bsdnet_need_memory)
                 *              rtems_bsdnet_need_memory = 0;
                 *              message_queue_broadcast
                 */
                rtems_task_wake_after (rtems_bsdnet_ticks_per_second);
        }
}

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

/*
 * Do the initializations required by the BSD code
 * FIXME: Maybe we should use a different memory allocation scheme that
 * would let us share space between mbufs and mbuf clusters.
 * For now, we'll just take the easy way out!
 */
static void
bsd_init ()
{
        /*
         * Set up mbuf data strutures
         * Cluster allocation *must* come first -- see comment on kmem_malloc().
         */
        m_clalloc (nmbclusters, M_DONTWAIT);
        mclrefcnt = malloc (nmbclusters);
        if (mclrefcnt == NULL)
                rtems_panic ("No memory for mbuf cluster reference counts.");
        memset (mclrefcnt, '\0', nmbclusters);
        m_mballoc (nmbuf, M_DONTWAIT);
        mbstat.m_mtypes[MT_FREE] = nmbuf;


        /*
         * Set up domains
         */
        {
        extern struct domain routedomain;
        extern struct domain inetdomain;

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

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

/*
 * Initialize and start network operations
 */
static void
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;

        /*
         * Create the task-synchronization semaphore
         */
        sc = rtems_semaphore_create (rtems_build_name('B', 'S', 'D', 'n'),
                                        0,
                                        RTEMS_FIFO |
                                                RTEMS_BINARY_SEMAPHORE |
                                                RTEMS_NO_INHERIT_PRIORITY |
                                                RTEMS_NO_PRIORITY_CEILING |
                                                RTEMS_LOCAL,
                                        0,
                                        &networkSemaphore);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("Can't create network seamphore: `%s'\n", rtems_status_text (sc));

        /*
         * 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
         */
        rtems_task_wake_after (rtems_bsdnet_ticks_per_second);

        /*
         * Set up BSD-style sockets
         */
        bsd_init ();

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

        /*
         * Register as an external I/O handler
         */
        rtems_register_libio_handler (LIBIO_FLAGS_HANDLER_SOCK,
                                                &rtems_bsdnet_io_handler);

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

rtems_id TaskWithSemaphore;
/*
 * Obtain network mutex
 */
void
rtems_bsdnet_semaphore_obtain (void)
{
        rtems_status_code sc;

        sc = rtems_semaphore_obtain (networkSemaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
rtems_task_ident (RTEMS_SELF, 0, &TaskWithSemaphore);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("Can't obtain network semaphore: `%s'\n", rtems_status_text (sc));
}

/*
 * Release network mutex
 */
void
rtems_bsdnet_semaphore_release (void)
{
        rtems_status_code sc;

TaskWithSemaphore = 0;
        sc = rtems_semaphore_release (networkSemaphore);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_panic ("Can't release network semaphore: `%s'\n", rtems_status_text (sc));
                                                                                }

/*
 * 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;

        /*
         * 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;
{
        rtems_id tid;

        if ((tid = sb->sb_sel.si_pid) != 0) {
                sb->sb_sel.si_pid = 0;
                rtems_event_send (tid, SBWAIT_EVENT);
        }
}

/*
 * 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_event_set events;
        rtems_interval now;
        int ticksPassed;
        unsigned32 timeout;
        struct callout *c;

        for (;;) {
                c = calltodo.c_next;
                if (c)
                        timeout = c->c_time;
                else
                        timeout = RTEMS_NO_TIMEOUT;
                rtems_bsdnet_event_receive (NETISR_EVENTS,
                                                RTEMS_EVENT_ANY | RTEMS_WAIT,
                                                timeout,
                                                &events);
                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
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
 * FIXME: 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);
        }
}

/*
 * Hack alert: kmem_malloc `knows' that its
 * first invocation is to get mbuf clusters!
 */
int mb_map_full;
vm_map_t mb_map;
vm_offset_t
kmem_malloc (vm_map_t *map, vm_size_t size, boolean_t waitflag)
{
        void *p;
        
        /*
         * Can't get memory if we're already running.
         */
        if (networkDaemonTid) {
                if (waitflag == M_WAITOK)
                        rtems_panic (
"Network mbuf space can not be enlarged after rtems_bsdnet_initialize() has\n"
"returned.  Enlarge the initial mbuf/cluster size in rtems_bsdnet_config.");
                return 0;
        }

#define ROUNDSIZE 2048
        p = malloc (size+ROUNDSIZE);
        p = (void *)((unsigned long)p & ~(ROUNDSIZE-1));
        if ((p == NULL) && (waitflag == M_WAITOK))
                rtems_panic ("Can't get initial network memory!");
        if (mbutl == NULL)
                mbutl = p;
        return (vm_offset_t)p;
}

/*
 * IP header checksum routine for processors which don't have an inline version
 */
u_int
in_cksum_hdr (const void *ip)
{
        rtems_unsigned32 sum;
        const rtems_unsigned16 *sp;
        int i;

        sum = 0;
        sp = (rtems_unsigned16 *)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 void
rtems_bsdnet_setup (void)
{
        struct rtems_bsdnet_ifconfig *ifp;
        int s;
        struct ifreq ifreq;
        struct sockaddr_in address;
        struct sockaddr_in netmask;
        struct sockaddr_in broadcast;
        struct sockaddr_in gateway;
        int i;

        /*
         * 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]);
        }

        /*
         * Configure interfaces
         */
        s = socket (AF_INET, SOCK_DGRAM, 0);
        if (s < 0)
                rtems_panic ("Can't create initial socket: %s", strerror (errno));
        for (ifp = rtems_bsdnet_config.ifconfig ; ifp ; ifp = ifp->next) {
                if (ifp->ip_address == NULL)
                        continue;

                /*
                 * Get the interface flags
                 */
                strcpy (ifreq.ifr_name, ifp->name);
                if (ioctl (s, SIOCGIFFLAGS, &ifreq) < 0)
                        rtems_panic ("Can't get %s flags: %s", ifp->name, strerror (errno));

                /*
                 * Bring interface up
                 */
                ifreq.ifr_flags |= IFF_UP;
                if (ioctl (s, SIOCSIFFLAGS, &ifreq) < 0)
                        rtems_panic ("Can't bring %s up: %s", ifp->name, strerror (errno));

                /*
                 * 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);
                memcpy (&ifreq.ifr_addr, &netmask, sizeof netmask);
                if (ioctl (s, SIOCSIFNETMASK, &ifreq) < 0)
                        rtems_panic ("Can't set %s netmask: %s", ifp->name, strerror (errno));

                /*
                 * 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);
                memcpy (&ifreq.ifr_addr, &address, sizeof address);
                if (ioctl (s, SIOCSIFADDR, &ifreq) < 0)
                        rtems_panic ("Can't set %s address: %s", ifp->name, strerror (errno));

                /*
                 * Set interface broadcast address
                 */
                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;
                memcpy (&ifreq.ifr_broadaddr, &broadcast, sizeof broadcast);
                if (ioctl (s, SIOCSIFBRDADDR, &ifreq) < 0)
                        rtems_panic ("Can't set %s broadcast address: %s", ifp->name, strerror (errno));
        }

        /*
         * We're done with the dummy socket
         */
        close (s);

        /*
         * Set default route
         */
        if (rtems_bsdnet_config.gateway) {
                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)
                        rtems_panic ("Can't set default route: %s", strerror (errno));
        }
}

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

        /*
         * Start network tasks.
         * Initialize BSD network data structures.
         */
        rtems_bsdnet_initialize ();

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

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