sys/boot/common/dev_net.c

   1 /*
   2  * $NetBSD: dev_net.c,v 1.12 1997/12/10 20:38:37 gwr Exp $
   3  */
   4
   5 /*-
   6  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   7  * All rights reserved.
   8  *
   9  * This code is derived from software contributed to The NetBSD Foundation
  10  * by Gordon W. Ross.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *        This product includes software developed by the NetBSD
  23  *        Foundation, Inc. and its contributors.
  24  * 4. Neither the name of The NetBSD Foundation nor the names of its
  25  *    contributors may be used to endorse or promote products derived
  26  *    from this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  29  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  31  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  34  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  35  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  36  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  37  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38  * POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * $FreeBSD: src/sys/boot/common/dev_net.c,v 1.13 2003/11/03 19:45:05 iedowse Exp $
  41  * $DragonFly: src/sys/boot/common/dev_net.c,v 1.4 2003/11/10 06:08:31 dillon Exp $
  42  */
  43
  44 /*-
  45  * This module implements a "raw device" interface suitable for
  46  * use by the stand-alone I/O library NFS code.  This interface
  47  * does not support any "block" access, and exists only for the
  48  * purpose of initializing the network interface, getting boot
  49  * parameters, and performing the NFS mount.
  50  *
  51  * At open time, this does:
  52  *
  53  * find interface      - netif_open()
  54  * RARP for IP address - rarp_getipaddress()
  55  * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
  56  * RPC/mountd          - nfs_mount(sock, ip, path)
  57  *
  58  * the root file handle from mountd is saved in a global
  59  * for use by the NFS open code (NFS/lookup).
  60  */
  61
  62 #include <machine/stdarg.h>
  63 #include <sys/param.h>
  64 #include <sys/socket.h>
  65 #include <net/if.h>
  66 #include <netinet/in.h>
  67 #include <netinet/in_systm.h>
  68
  69 #include <stand.h>
  70 #include <string.h>
  71 #include <net.h>
  72 #include <netif.h>
  73 #include <bootp.h>
  74 #include <bootparam.h>
  75
  76 #include "dev_net.h"
  77 #include "bootstrap.h"
  78
  79 int debug = 0;
  80
  81 static int netdev_sock = -1;
  82 static int netdev_opens;
  83
  84 static int      net_init(void);
  85 static int      net_open(struct open_file *, ...);
  86 static int      net_close(struct open_file *);
  87 static int      net_strategy();
  88 static void     net_print(int);
  89
  90 static int net_getparams(int sock);
  91
  92 struct devsw netdev = {
  93     "net",
  94     DEVT_NET,
  95     net_init,
  96     net_strategy,
  97     net_open,
  98     net_close,
  99     noioctl,
 100     net_print
 101 };
 102
 103 int
 104 net_init(void)
 105 {
 106     return 0;
 107 }
 108
 109 /*
 110  * Called by devopen after it sets f->f_dev to our devsw entry.
 111  * This opens the low-level device and sets f->f_devdata.
 112  * This is declared with variable arguments...
 113  */
 114 int
 115 net_open(struct open_file *f, ...)
 116 {
 117     va_list args;
 118     char *devname;              /* Device part of file name (or NULL). */
 119     int error = 0;
 120
 121     va_start(args, f);
 122     devname = va_arg(args, char*);
 123     va_end(args);
 124
 125     /* On first open, do netif open, mount, etc. */
 126     if (netdev_opens == 0) {
 127         /* Find network interface. */
 128         if (netdev_sock < 0) {
 129             netdev_sock = netif_open(devname);
 130             if (netdev_sock < 0) {
 131                 printf("net_open: netif_open() failed\n");
 132                 return (ENXIO);
 133             }
 134             if (debug)
 135                 printf("net_open: netif_open() succeeded\n");
 136         }
 137         if (rootip.s_addr == 0) {
 138             /* Get root IP address, and path, etc. */
 139             error = net_getparams(netdev_sock);
 140             if (error) {
 141                                 /* getparams makes its own noise */
 142                 netif_close(netdev_sock);
 143                 netdev_sock = -1;
 144                 return (error);
 145             }
 146         }
 147         netdev_opens++;
 148     }
 149     netdev_opens++;
 150     f->f_devdata = &netdev_sock;
 151     return (error);
 152 }
 153
 154 int
 155 net_close(f)
 156     struct open_file *f;
 157 {
 158
 159 #ifdef  NETIF_DEBUG
 160     if (debug)
 161         printf("net_close: opens=%d\n", netdev_opens);
 162 #endif
 163
 164     /* On last close, do netif close, etc. */
 165     f->f_devdata = NULL;
 166     /* Extra close call? */
 167     if (netdev_opens <= 0)
 168         return (0);
 169     netdev_opens--;
 170     /* Not last close? */
 171     if (netdev_opens > 0)
 172         return(0);
 173     rootip.s_addr = 0;
 174     if (netdev_sock >= 0) {
 175         if (debug)
 176             printf("net_close: calling netif_close()\n");
 177         netif_close(netdev_sock);
 178         netdev_sock = -1;
 179     }
 180     return (0);
 181 }
 182
 183 int
 184 net_strategy()
 185 {
 186     return EIO;
 187 }
 188
 189 #define SUPPORT_BOOTP
 190
 191 /*
 192  * Get info for NFS boot: our IP address, our hostname,
 193  * server IP address, and our root path on the server.
 194  * There are two ways to do this:  The old, Sun way,
 195  * and the more modern, BOOTP way. (RFC951, RFC1048)
 196  *
 197  * The default is to use the Sun bootparams RPC
 198  * (because that is what the kernel will do).
 199  * MD code can make try_bootp initialied data,
 200  * which will override this common definition.
 201  */
 202 #ifdef  SUPPORT_BOOTP
 203 int try_bootp = 1;
 204 #endif
 205
 206 extern n_long ip_convertaddr(char *p);
 207
 208 static int
 209 net_getparams(sock)
 210     int sock;
 211 {
 212     char buf[MAXHOSTNAMELEN];
 213     char temp[FNAME_SIZE];
 214     struct iodesc *d;
 215     int i;
 216     n_long smask;
 217
 218 #ifdef  SUPPORT_BOOTP
 219     /*
 220      * Try to get boot info using BOOTP.  If we succeed, then
 221      * the server IP address, gateway, and root path will all
 222      * be initialized.  If any remain uninitialized, we will
 223      * use RARP and RPC/bootparam (the Sun way) to get them.
 224      */
 225     if (try_bootp)
 226         bootp(sock, BOOTP_NONE);
 227     if (myip.s_addr != 0)
 228         goto exit;
 229     if (debug)
 230         printf("net_open: BOOTP failed, trying RARP/RPC...\n");
 231 #endif
 232
 233     /*
 234      * Use RARP to get our IP address.  This also sets our
 235      * netmask to the "natural" default for our address.
 236      */
 237     if (rarp_getipaddress(sock)) {
 238         printf("net_open: RARP failed\n");
 239         return (EIO);
 240     }
 241     printf("net_open: client addr: %s\n", inet_ntoa(myip));
 242
 243     /* Get our hostname, server IP address, gateway. */
 244     if (bp_whoami(sock)) {
 245         printf("net_open: bootparam/whoami RPC failed\n");
 246         return (EIO);
 247     }
 248     printf("net_open: client name: %s\n", hostname);
 249
 250     /*
 251      * Ignore the gateway from whoami (unreliable).
 252      * Use the "gateway" parameter instead.
 253      */
 254     smask = 0;
 255     gateip.s_addr = 0;
 256     if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
 257         /* Got it!  Parse the netmask. */
 258         smask = ip_convertaddr(buf);
 259     }
 260     if (smask) {
 261         netmask = smask;
 262         printf("net_open: subnet mask: %s\n", intoa(netmask));
 263     }
 264     if (gateip.s_addr)
 265         printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
 266
 267     /* Get the root server and pathname. */
 268     if (bp_getfile(sock, "root", &rootip, rootpath)) {
 269         printf("net_open: bootparam/getfile RPC failed\n");
 270         return (EIO);
 271     }
 272  exit:
 273     /*
 274      * If present, strip the server's address off of the rootpath
 275      * before passing it along.  This allows us to be compatible with
 276      * the kernel's diskless (BOOTP_NFSROOT) booting conventions
 277      */
 278     for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
 279             if (rootpath[i] == ':')
 280                     break;
 281     if (i && i != FNAME_SIZE && rootpath[i] == ':') {
 282             rootpath[i++] = '\0';
 283             if (inet_addr(&rootpath[0]) != INADDR_NONE)
 284                     rootip.s_addr = inet_addr(&rootpath[0]);
 285             bcopy(&rootpath[i], &temp[0], strlen(&rootpath[i])+1);
 286             bcopy(&temp[0], &rootpath[0], strlen(&rootpath[i])+1);
 287     }
 288     printf("net_open: server addr: %s\n", inet_ntoa(rootip));
 289     printf("net_open: server path: %s\n", rootpath);
 290
 291     d = socktodesc(sock);
 292     sprintf(temp, "%6D", d->myea, ":");
 293     setenv("boot.netif.ip", inet_ntoa(myip), 1);
 294     setenv("boot.netif.netmask", intoa(netmask), 1);
 295     setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
 296     setenv("boot.netif.hwaddr", temp, 1);
 297     setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
 298     setenv("boot.nfsroot.path", rootpath, 1);
 299
 300     return (0);
 301 }
 302
 303 static void
 304 net_print(int verbose)
 305 {
 306     return;
 307 }