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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)autoconf.c    7.1 (Berkeley) 5/9/91
   37  * $FreeBSD: releng/5.0/sys/nfsclient/nfs_diskless.c 103770 2002-09-22 00:59:02Z jake $
   38  */
   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 <nfs/rpcv2.h>
   54 #include <nfs/nfsproto.h>
   55 #include <nfsclient/nfs.h>
   56 #include <nfsclient/nfsdiskless.h>
   57 
   58 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
   59 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
   60 static int decode_nfshandle(char *ev, u_char *fh);
   61 
   62 /*
   63  * Populate the essential fields in the nfsv3_diskless structure.
   64  *
   65  * The loader is expected to export the following environment variables:
   66  *
   67  * boot.netif.ip                IP address on boot interface
   68  * boot.netif.netmask           netmask on boot interface
   69  * boot.netif.gateway           default gateway (optional)
   70  * boot.netif.hwaddr            hardware address of boot interface
   71  * boot.nfsroot.server          IP address of root filesystem server
   72  * boot.nfsroot.path            path of the root filesystem on server
   73  * boot.nfsroot.nfshandle       NFS handle for root filesystem on server
   74  */
   75 void
   76 nfs_setup_diskless(void)
   77 {
   78         struct nfs_diskless *nd = &nfs_diskless;
   79         struct ifnet *ifp;
   80         struct ifaddr *ifa;
   81         struct sockaddr_dl *sdl, ourdl;
   82         struct sockaddr_in myaddr, netmask;
   83         char *cp;
   84 
   85         if (nfs_diskless_valid)
   86                 return;
   87         /* set up interface */
   88         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
   89                 return;
   90         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
   91                 printf("nfs_diskless: no netmask\n");
   92                 return;
   93         }
   94         bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
   95         bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
   96         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
   97                 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
   98         bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
   99 
  100         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  101                 printf("nfs_diskless: no hardware address\n");
  102                 return;
  103         }
  104         ifa = NULL;
  105         TAILQ_FOREACH(ifp, &ifnet, if_link) {
  106                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  107                         if ((ifa->ifa_addr->sa_family == AF_LINK) &&
  108                             (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
  109                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  110                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  111                                     !bcmp(sdl->sdl_data + sdl->sdl_nlen,
  112                                           ourdl.sdl_data + ourdl.sdl_nlen, 
  113                                           sdl->sdl_alen))
  114                                     goto match_done;
  115                         }
  116                 }
  117         }
  118         printf("nfs_diskless: no interface\n");
  119         return; /* no matching interface */
  120 match_done:
  121         sprintf(nd->myif.ifra_name, "%s%d", ifp->if_name, ifp->if_unit);
  122         
  123         /* set up gateway */
  124         inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  125 
  126         /* XXX set up swap? */
  127 
  128         /* set up root mount */
  129         nd->root_args.rsize = 8192;             /* XXX tunable? */
  130         nd->root_args.wsize = 8192;
  131         nd->root_args.sotype = SOCK_DGRAM;
  132         nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
  133         if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
  134                 printf("nfs_diskless: no server\n");
  135                 return;
  136         }
  137         nd->root_saddr.sin_port = htons(NFS_PORT);
  138         if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
  139                 printf("nfs_diskless: no NFS handle\n");
  140                 return;
  141         }
  142         if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  143                 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  144                 freeenv(cp);
  145         }
  146 
  147         nfs_diskless_valid = 1;
  148 }
  149 
  150 static int
  151 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  152 {
  153         u_int32_t a[4];
  154         char *cp;
  155         int count;
  156 
  157         bzero(sa, sizeof(*sa));
  158         sa->sin_len = sizeof(*sa);
  159         sa->sin_family = AF_INET;
  160 
  161         if ((cp = getenv(ev)) == NULL)
  162                 return (1);
  163         count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
  164         freeenv(cp);
  165         if (count != 4)
  166                 return (1);
  167         sa->sin_addr.s_addr =
  168             htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
  169         return (0);
  170 }
  171 
  172 static int
  173 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  174 {
  175         char *cp;
  176         u_int32_t a[6];
  177         int count;
  178 
  179         bzero(sa, sizeof(*sa));
  180         sa->sdl_len = sizeof(*sa);
  181         sa->sdl_family = AF_LINK;
  182         sa->sdl_type = IFT_ETHER;
  183         sa->sdl_alen = ETHER_ADDR_LEN;
  184         if ((cp = getenv(ev)) == NULL)
  185                 return (1);
  186         count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
  187             &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
  188         freeenv(cp);
  189         if (count != 6)
  190                 return (1);
  191         sa->sdl_data[0] = a[0];
  192         sa->sdl_data[1] = a[1];
  193         sa->sdl_data[2] = a[2];
  194         sa->sdl_data[3] = a[3];
  195         sa->sdl_data[4] = a[4];
  196         sa->sdl_data[5] = a[5];
  197         return (0);
  198 }
  199 
  200 static int
  201 decode_nfshandle(char *ev, u_char *fh) 
  202 {
  203         u_char *cp, *ep;
  204         int len, val;
  205 
  206         ep = cp = getenv(ev);
  207         if (cp == NULL)
  208                 return (0);
  209         if ((strlen(cp) < 2) || (*cp != 'X')) {
  210                 freeenv(ep);
  211                 return (0);
  212         }
  213         len = 0;
  214         cp++;
  215         for (;;) {
  216                 if (*cp == 'X') {
  217                         freeenv(ep);
  218                         return (len);
  219                 }
  220                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
  221                         freeenv(ep);
  222                         return (0);
  223                 }
  224                 *(fh++) = val;
  225                 len++;
  226                 cp += 2;
  227                 if (len > NFSX_V2FH) {
  228                     freeenv(ep);
  229                     return (0);
  230                 }
  231         }
  232 }

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