FreeBSD/Linux Kernel Cross Reference
sys/boot/common/dev_net.c

     /*      
      * $NetBSD: dev_net.c,v 1.12 1997/12/10 20:38:37 gwr Exp $
      */
     
     /*-
      * Copyright (c) 1997 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
     * by Gordon W. Ross.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*-
     * This module implements a "raw device" interface suitable for
     * use by the stand-alone I/O library NFS code.  This interface
     * does not support any "block" access, and exists only for the
     * purpose of initializing the network interface, getting boot
     * parameters, and performing the NFS mount.
     *
     * At open time, this does:
     *
     * find interface      - netif_open()
     * RARP for IP address - rarp_getipaddress()
     * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
     * RPC/mountd          - nfs_mount(sock, ip, path)
     *
     * the root file handle from mountd is saved in a global
     * for use by the NFS open code (NFS/lookup).
     */
    
    #include <machine/stdarg.h>
    #include <sys/param.h>
    #include <sys/socket.h>
    #include <net/if.h>
    #include <netinet/in.h>
    #include <netinet/in_systm.h>
    
    #include <stand.h>
    #include <string.h>
    #include <net.h>
    #include <netif.h>
    #include <bootp.h>
    #include <bootparam.h>
    
    #include "dev_net.h"
    #include "bootstrap.h"
    
    int debug = 0;
    
    static int netdev_sock = -1;
    static int netdev_opens;
    
    static int      net_init(void);
    static int      net_open(struct open_file *, ...);
    static int      net_close(struct open_file *);
    static int      net_strategy();
    static void     net_print(int);
    
    static int net_getparams(int sock);
    
    struct devsw netdev = {
        "net", 
        DEVT_NET, 
        net_init,
        net_strategy, 
        net_open, 
        net_close, 
        noioctl,
       net_print
   };
   
   int
   net_init(void)
   {
       return 0;
   }
   
   /*
    * Called by devopen after it sets f->f_dev to our devsw entry.
    * This opens the low-level device and sets f->f_devdata.
    * This is declared with variable arguments...
    */
   int
   net_open(struct open_file *f, ...)
   {
       va_list args;
       char *devname;              /* Device part of file name (or NULL). */
       int error = 0;
   
       va_start(args, f);
       devname = va_arg(args, char*);
       va_end(args);
   
       /* On first open, do netif open, mount, etc. */
       if (netdev_opens == 0) {
           /* Find network interface. */
           if (netdev_sock < 0) {
               netdev_sock = netif_open(devname);
               if (netdev_sock < 0) {
                   printf("net_open: netif_open() failed\n");
                   return (ENXIO);
               }
               if (debug)
                   printf("net_open: netif_open() succeeded\n");
           }
           if (rootip.s_addr == 0) {
               /* Get root IP address, and path, etc. */
               error = net_getparams(netdev_sock);
               if (error) {
                                   /* getparams makes its own noise */
                   netif_close(netdev_sock);
                   netdev_sock = -1;
                   return (error);
               }
           }
           netdev_opens++;
       }
       netdev_opens++;
       f->f_devdata = &netdev_sock;
       return (error);
   }
   
   int
   net_close(f)
       struct open_file *f;
   {
   
   #ifdef  NETIF_DEBUG
       if (debug)
           printf("net_close: opens=%d\n", netdev_opens);
   #endif
   
       /* On last close, do netif close, etc. */
       f->f_devdata = NULL;
       /* Extra close call? */
       if (netdev_opens <= 0)
           return (0);
       netdev_opens--;
       /* Not last close? */
       if (netdev_opens > 0)
           return(0);
       rootip.s_addr = 0;
       if (netdev_sock >= 0) {
           if (debug)
               printf("net_close: calling netif_close()\n");
           netif_close(netdev_sock);
           netdev_sock = -1;
       }
       return (0);
   }
   
   int
   net_strategy()
   {
       return EIO;
   }
   
   #define SUPPORT_BOOTP
   
   /*
    * Get info for NFS boot: our IP address, our hostname,
    * server IP address, and our root path on the server.
    * There are two ways to do this:  The old, Sun way,
    * and the more modern, BOOTP way. (RFC951, RFC1048)
    *
    * The default is to use the Sun bootparams RPC
    * (because that is what the kernel will do).
    * MD code can make try_bootp initialied data,
    * which will override this common definition.
    */
   #ifdef  SUPPORT_BOOTP
   int try_bootp = 1;
   #endif
   
   extern n_long ip_convertaddr(char *p);
   
   static int
   net_getparams(sock)
       int sock;
   {
       char buf[MAXHOSTNAMELEN];
       char temp[FNAME_SIZE];
       struct iodesc *d;
       int i;
       n_long smask;
   
   #ifdef  SUPPORT_BOOTP
       /*
        * Try to get boot info using BOOTP.  If we succeed, then
        * the server IP address, gateway, and root path will all
        * be initialized.  If any remain uninitialized, we will
        * use RARP and RPC/bootparam (the Sun way) to get them.
        */
       if (try_bootp)
           bootp(sock, BOOTP_NONE);
       if (myip.s_addr != 0)
           goto exit;
       if (debug)
           printf("net_open: BOOTP failed, trying RARP/RPC...\n");
   #endif
   
       /*
        * Use RARP to get our IP address.  This also sets our
        * netmask to the "natural" default for our address.
        */
       if (rarp_getipaddress(sock)) {
           printf("net_open: RARP failed\n");
           return (EIO);
       }
       printf("net_open: client addr: %s\n", inet_ntoa(myip));
   
       /* Get our hostname, server IP address, gateway. */
       if (bp_whoami(sock)) {
           printf("net_open: bootparam/whoami RPC failed\n");
           return (EIO);
       }
       printf("net_open: client name: %s\n", hostname);
   
       /*
        * Ignore the gateway from whoami (unreliable).
        * Use the "gateway" parameter instead.
        */
       smask = 0;
       gateip.s_addr = 0;
       if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
           /* Got it!  Parse the netmask. */
           smask = ip_convertaddr(buf);
       }
       if (smask) {
           netmask = smask;
           printf("net_open: subnet mask: %s\n", intoa(netmask));
       }
       if (gateip.s_addr)
           printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
   
       /* Get the root server and pathname. */
       if (bp_getfile(sock, "root", &rootip, rootpath)) {
           printf("net_open: bootparam/getfile RPC failed\n");
           return (EIO);
       }
    exit:
       /*  
        * If present, strip the server's address off of the rootpath
        * before passing it along.  This allows us to be compatible with
        * the kernel's diskless (BOOTP_NFSROOT) booting conventions
        */
       for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
               if (rootpath[i] == ':')
                       break;
       if (i && i != FNAME_SIZE && rootpath[i] == ':') {
               rootpath[i++] = '\0';
               if (inet_addr(&rootpath[0]) != INADDR_NONE)
                       rootip.s_addr = inet_addr(&rootpath[0]);
               bcopy(&rootpath[i], &temp[0], strlen(&rootpath[i])+1);
               bcopy(&temp[0], &rootpath[0], strlen(&rootpath[i])+1);          
       }
       printf("net_open: server addr: %s\n", inet_ntoa(rootip));
       printf("net_open: server path: %s\n", rootpath);        
   
       d = socktodesc(sock);
       sprintf(temp, "%6D", d->myea, ":");
       setenv("boot.netif.ip", inet_ntoa(myip), 1);
       setenv("boot.netif.netmask", intoa(netmask), 1);
       setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
       setenv("boot.netif.hwaddr", temp, 1);
       setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
       setenv("boot.nfsroot.path", rootpath, 1);
   
       return (0);
   }
   
   static void
   net_print(int verbose)
   {
       return;
   }

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