The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/nfs_diskless.c

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)autoconf.c    7.1 (Berkeley) 5/9/91
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: src/sys/nfsclient/nfs_diskless.c,v 1.8.2.1 2005/01/24 13:50:04 brian Exp $");
   37 
   38 #include "opt_bootp.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mount.h>
   45 
   46 #include <sys/socket.h>
   47 #include <net/if.h>
   48 #include <net/if_dl.h>
   49 #include <net/if_types.h>
   50 #include <net/if_var.h>
   51 #include <net/ethernet.h>
   52 #include <netinet/in.h>
   53 #include <rpc/rpcclnt.h>
   54 #include <nfs/rpcv2.h>
   55 #include <nfs/nfsproto.h>
   56 #include <nfsclient/nfs.h>
   57 #include <nfsclient/nfsdiskless.h>
   58 
   59 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
   60 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
   61 static int decode_nfshandle(char *ev, u_char *fh);
   62 
   63 /*
   64  * Populate the essential fields in the nfsv3_diskless structure.
   65  *
   66  * The loader is expected to export the following environment variables:
   67  *
   68  * boot.netif.ip                IP address on boot interface
   69  * boot.netif.netmask           netmask on boot interface
   70  * boot.netif.gateway           default gateway (optional)
   71  * boot.netif.hwaddr            hardware address of boot interface
   72  * boot.nfsroot.server          IP address of root filesystem server
   73  * boot.nfsroot.path            path of the root filesystem on server
   74  * boot.nfsroot.nfshandle       NFS handle for root filesystem on server
   75  */
   76 void
   77 nfs_setup_diskless(void)
   78 {
   79         struct nfs_diskless *nd = &nfs_diskless;
   80         struct ifnet *ifp;
   81         struct ifaddr *ifa;
   82         struct sockaddr_dl *sdl, ourdl;
   83         struct sockaddr_in myaddr, netmask;
   84         char *cp;
   85 
   86         if (nfs_diskless_valid)
   87                 return;
   88         /* set up interface */
   89         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
   90                 return;
   91         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
   92                 printf("nfs_diskless: no netmask\n");
   93                 return;
   94         }
   95         bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
   96         bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
   97         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
   98                 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
   99         bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
  100 
  101         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  102                 printf("nfs_diskless: no hardware address\n");
  103                 return;
  104         }
  105         ifa = NULL;
  106         IFNET_RLOCK();
  107         TAILQ_FOREACH(ifp, &ifnet, if_link) {
  108                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  109                         if ((ifa->ifa_addr->sa_family == AF_LINK) &&
  110                             (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
  111                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  112                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  113                                     !bcmp(sdl->sdl_data + sdl->sdl_nlen,
  114                                           ourdl.sdl_data + ourdl.sdl_nlen, 
  115                                           sdl->sdl_alen)) {
  116                                     IFNET_RUNLOCK();
  117                                     goto match_done;
  118                                 }
  119                         }
  120                 }
  121         }
  122         IFNET_RUNLOCK();
  123         printf("nfs_diskless: no interface\n");
  124         return; /* no matching interface */
  125 match_done:
  126         strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
  127         
  128         /* set up gateway */
  129         inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  130 
  131         /* set up root mount */
  132         nd->root_args.rsize = 8192;             /* XXX tunable? */
  133         nd->root_args.wsize = 8192;
  134         nd->root_args.sotype = SOCK_DGRAM;
  135         nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
  136         if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
  137                 printf("nfs_diskless: no server\n");
  138                 return;
  139         }
  140         nd->root_saddr.sin_port = htons(NFS_PORT);
  141         if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
  142                 printf("nfs_diskless: no NFS handle\n");
  143                 return;
  144         }
  145         if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  146                 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  147                 freeenv(cp);
  148         }
  149 
  150         nfs_diskless_valid = 1;
  151 }
  152 
  153 static int
  154 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  155 {
  156         u_int32_t a[4];
  157         char *cp;
  158         int count;
  159 
  160         bzero(sa, sizeof(*sa));
  161         sa->sin_len = sizeof(*sa);
  162         sa->sin_family = AF_INET;
  163 
  164         if ((cp = getenv(ev)) == NULL)
  165                 return (1);
  166         count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
  167         freeenv(cp);
  168         if (count != 4)
  169                 return (1);
  170         sa->sin_addr.s_addr =
  171             htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
  172         return (0);
  173 }
  174 
  175 static int
  176 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  177 {
  178         char *cp;
  179         u_int32_t a[6];
  180         int count;
  181 
  182         bzero(sa, sizeof(*sa));
  183         sa->sdl_len = sizeof(*sa);
  184         sa->sdl_family = AF_LINK;
  185         sa->sdl_type = IFT_ETHER;
  186         sa->sdl_alen = ETHER_ADDR_LEN;
  187         if ((cp = getenv(ev)) == NULL)
  188                 return (1);
  189         count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
  190             &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
  191         freeenv(cp);
  192         if (count != 6)
  193                 return (1);
  194         sa->sdl_data[0] = a[0];
  195         sa->sdl_data[1] = a[1];
  196         sa->sdl_data[2] = a[2];
  197         sa->sdl_data[3] = a[3];
  198         sa->sdl_data[4] = a[4];
  199         sa->sdl_data[5] = a[5];
  200         return (0);
  201 }
  202 
  203 static int
  204 decode_nfshandle(char *ev, u_char *fh) 
  205 {
  206         u_char *cp, *ep;
  207         int len, val;
  208 
  209         ep = cp = getenv(ev);
  210         if (cp == NULL)
  211                 return (0);
  212         if ((strlen(cp) < 2) || (*cp != 'X')) {
  213                 freeenv(ep);
  214                 return (0);
  215         }
  216         len = 0;
  217         cp++;
  218         for (;;) {
  219                 if (*cp == 'X') {
  220                         freeenv(ep);
  221                         return (len);
  222                 }
  223                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
  224                         freeenv(ep);
  225                         return (0);
  226                 }
  227                 *(fh++) = val;
  228                 len++;
  229                 cp += 2;
  230                 if (len > NFSX_V2FH) {
  231                     freeenv(ep);
  232                     return (0);
  233                 }
  234         }
  235 }
  236 
  237 #if !defined(BOOTP_NFSROOT)
  238 static void
  239 nfs_rootconf(void)
  240 {
  241 
  242         nfs_setup_diskless();
  243         if (nfs_diskless_valid)
  244                 rootdevnames[0] = "nfs:";
  245 }
  246 
  247 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL)
  248 #endif
  249 

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