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  */
  42
  43 /*-
  44  * This module implements a "raw device" interface suitable for
  45  * use by the stand-alone I/O library NFS code.  This interface
  46  * does not support any "block" access, and exists only for the
  47  * purpose of initializing the network interface, getting boot
  48  * parameters, and performing the NFS mount.
  49  *
  50  * At open time, this does:
  51  *
  52  * find interface      - netif_open()
  53  * RARP for IP address - rarp_getipaddress()
  54  * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
  55  * RPC/mountd          - nfs_mount(sock, ip, path)
  56  *
  57  * the root file handle from mountd is saved in a global
  58  * for use by the NFS open code (NFS/lookup).
  59  */
  60
  61 #include <machine/stdarg.h>
  62 #include <sys/param.h>
  63 #include <sys/socket.h>
  64 #include <net/if.h>
  65 #include <netinet/in.h>
  66 #include <netinet/in_systm.h>
  67
  68 #include <stand.h>
  69 #include <string.h>
  70 #include <net.h>
  71 #include <netif.h>
  72 #include <bootp.h>
  73 #include <bootparam.h>
  74
  75 #include "dev_net.h"
  76 #include "bootstrap.h"
  77
  78 int debug = 0;
  79
  80 static int netdev_sock = -1;
  81 static int netdev_opens;
  82
  83 static int      net_init(void);
  84 static int      net_open(struct open_file *, ...);
  85 static int      net_close(struct open_file *);
  86 static int      net_strategy(void *, int, daddr_t, size_t, char *, size_t *);
  87 static void     net_print(int);
  88
  89 static int net_getparams(int sock);
  90
  91 struct devsw netdev = {
  92     "net",
  93     DEVT_NET,
  94     net_init,
  95     net_strategy,
  96     net_open,
  97     net_close,
  98     noioctl,
  99     net_print
 100 };
 101
 102 int
 103 net_init(void)
 104 {
 105     return 0;
 106 }
 107
 108 /*
 109  * Called by devopen after it sets f->f_dev to our devsw entry.
 110  * This opens the low-level device and sets f->f_devdata.
 111  * This is declared with variable arguments...
 112  */
 113 int
 114 net_open(struct open_file *f, ...)
 115 {
 116     va_list args;
 117     char *devname;              /* Device part of file name (or NULL). */
 118     int error = 0;
 119
 120     va_start(args, f);
 121     devname = va_arg(args, char*);
 122     va_end(args);
 123
 124     /* On first open, do netif open, mount, etc. */
 125     if (netdev_opens == 0) {
 126         /* Find network interface. */
 127         if (netdev_sock < 0) {
 128             netdev_sock = netif_open(devname);
 129             if (netdev_sock < 0) {
 130                 printf("net_open: netif_open() failed\n");
 131                 return (ENXIO);
 132             }
 133             if (debug)
 134                 printf("net_open: netif_open() succeeded\n");
 135         }
 136         if (rootip.s_addr == 0) {
 137             /* Get root IP address, and path, etc. */
 138             error = net_getparams(netdev_sock);
 139             if (error) {
 140                                 /* getparams makes its own noise */
 141                 netif_close(netdev_sock);
 142                 netdev_sock = -1;
 143                 return (error);
 144             }
 145         }
 146         netdev_opens++;
 147     }
 148     netdev_opens++;
 149     devreplace(f, &netdev_sock);
 150     return (error);
 151 }
 152
 153 int
 154 net_close(struct open_file *f)
 155 {
 156
 157 #ifdef  NETIF_DEBUG
 158     if (debug)
 159         printf("net_close: opens=%d\n", netdev_opens);
 160 #endif
 161
 162     /* On last close, do netif close, etc. */
 163     f->f_devdata = NULL;
 164     /* Extra close call? */
 165     if (netdev_opens <= 0)
 166         return (0);
 167     netdev_opens--;
 168     /* Not last close? */
 169     if (netdev_opens > 0)
 170         return(0);
 171     rootip.s_addr = 0;
 172     if (netdev_sock >= 0) {
 173         if (debug)
 174             printf("net_close: calling netif_close()\n");
 175         netif_close(netdev_sock);
 176         netdev_sock = -1;
 177     }
 178     return (0);
 179 }
 180
 181 int
 182 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
 183     size_t *rsize)
 184 {
 185     return EIO;
 186 }
 187
 188 #define SUPPORT_BOOTP
 189
 190 /*
 191  * Get info for NFS boot: our IP address, our hostname,
 192  * server IP address, and our root path on the server.
 193  * There are two ways to do this:  The old, Sun way,
 194  * and the more modern, BOOTP way. (RFC951, RFC1048)
 195  *
 196  * The default is to use the Sun bootparams RPC
 197  * (because that is what the kernel will do).
 198  * MD code can make try_bootp initialied data,
 199  * which will override this common definition.
 200  */
 201 #ifdef  SUPPORT_BOOTP
 202 int try_bootp = 1;
 203 #endif
 204
 205 extern n_long ip_convertaddr(char *p);
 206
 207 static int
 208 net_getparams(int sock)
 209 {
 210     char buf[MAXHOSTNAMELEN];
 211     char temp[FNAME_SIZE];
 212     struct iodesc *d;
 213     int i;
 214     n_long smask;
 215
 216 #ifdef  SUPPORT_BOOTP
 217     /*
 218      * Try to get boot info using BOOTP.  If we succeed, then
 219      * the server IP address, gateway, and root path will all
 220      * be initialized.  If any remain uninitialized, we will
 221      * use RARP and RPC/bootparam (the Sun way) to get them.
 222      */
 223     if (try_bootp)
 224         bootp(sock, BOOTP_NONE);
 225     if (myip.s_addr != 0)
 226         goto exit;
 227     if (debug)
 228         printf("net_open: BOOTP failed, trying RARP/RPC...\n");
 229 #endif
 230
 231     /*
 232      * Use RARP to get our IP address.  This also sets our
 233      * netmask to the "natural" default for our address.
 234      */
 235     if (rarp_getipaddress(sock)) {
 236         printf("net_open: RARP failed\n");
 237         return (EIO);
 238     }
 239     printf("net_open: client addr: %s\n", inet_ntoa(myip));
 240
 241     /* Get our hostname, server IP address, gateway. */
 242     if (bp_whoami(sock)) {
 243         printf("net_open: bootparam/whoami RPC failed\n");
 244         return (EIO);
 245     }
 246     printf("net_open: client name: %s\n", hostname);
 247
 248     /*
 249      * Ignore the gateway from whoami (unreliable).
 250      * Use the "gateway" parameter instead.
 251      */
 252     smask = 0;
 253     gateip.s_addr = 0;
 254     if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
 255         /* Got it!  Parse the netmask. */
 256         smask = ip_convertaddr(buf);
 257     }
 258     if (smask) {
 259         netmask = smask;
 260         printf("net_open: subnet mask: %s\n", intoa(netmask));
 261     }
 262     if (gateip.s_addr)
 263         printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
 264
 265     /* Get the root server and pathname. */
 266     if (bp_getfile(sock, "root", &rootip, rootpath)) {
 267         printf("net_open: bootparam/getfile RPC failed\n");
 268         return (EIO);
 269     }
 270  exit:
 271     /*
 272      * If present, strip the server's address off of the rootpath
 273      * before passing it along.  This allows us to be compatible with
 274      * the kernel's diskless (BOOTP_NFSROOT) booting conventions
 275      */
 276     for (i = 0; i < FNAME_SIZE && rootpath[i] != '\0'; i++)
 277             if (rootpath[i] == ':')
 278                     break;
 279     if (i && i != FNAME_SIZE && rootpath[i] == ':') {
 280             rootpath[i++] = '\0';
 281             if (inet_addr(&rootpath[0]) != INADDR_NONE)
 282                     rootip.s_addr = inet_addr(&rootpath[0]);
 283             bcopy(&rootpath[i], &temp[0], strlen(&rootpath[i])+1);
 284             bcopy(&temp[0], &rootpath[0], strlen(&rootpath[i])+1);
 285     }
 286     printf("net_open: server addr: %s\n", inet_ntoa(rootip));
 287     printf("net_open: server path: %s\n", rootpath);
 288
 289     d = socktodesc(sock);
 290     setenv("boot.netif.ip", inet_ntoa(myip), 1);
 291     setenv("boot.netif.netmask", intoa(netmask), 1);
 292     setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
 293     setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1);
 294     setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
 295     setenv("boot.nfsroot.path", rootpath, 1);
 296
 297     return (0);
 298 }
 299
 300 static void
 301 net_print(int verbose)
 302 {
 303     return;
 304 }