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("$FreeBSD$");
   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  * Validate/sanity check a rsize/wsize parameter.
   65  */
   66 static int
   67 checkrwsize(unsigned long v, const char *name)
   68 {
   69         /*
   70          * 32K is used as an upper bound because most servers
   71          * limit block size to satisfy IPv4's limit of
   72          * 64K/reassembled packet.  The lower bound is pretty
   73          * much arbitrary.
   74          */
   75         if (!(4 <= v && v <= 32*1024)) {
   76                 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
   77                 return 0;
   78         } else
   79                 return 1;
   80 }
   81 
   82 /*
   83  * Parse mount options and apply them to the supplied
   84  * nfs_diskless state.  Used also by bootp/dhcp support.
   85  */
   86 void
   87 nfs_parse_options(const char *envopts, struct nfs_args *nd)
   88 {
   89         char *opts, *o, *otmp;
   90         unsigned long v;
   91 
   92         opts = strdup(envopts, M_TEMP);
   93         otmp = opts;
   94         while ((o = strsep(&otmp, ":;, ")) != NULL) {
   95                 if (*o == '\0')
   96                         ; /* Skip empty options. */
   97                 else if (strcmp(o, "soft") == 0)
   98                         nd->flags |= NFSMNT_SOFT;
   99                 else if (strcmp(o, "intr") == 0)
  100                         nd->flags |= NFSMNT_INT;
  101                 else if (strcmp(o, "conn") == 0)
  102                         nd->flags |= NFSMNT_NOCONN;
  103                 else if (strcmp(o, "nolockd") == 0)
  104                         nd->flags |= NFSMNT_NOLOCKD;
  105                 else if (strcmp(o, "nfsv2") == 0)
  106                         nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
  107                 else if (strcmp(o, "nfsv3") == 0) {
  108                         nd->flags &= ~NFSMNT_NFSV4;
  109                         nd->flags |= NFSMNT_NFSV3;
  110                 } else if (strcmp(o, "tcp") == 0)
  111                         nd->sotype = SOCK_STREAM;
  112                 else if (strcmp(o, "udp") == 0)
  113                         nd->sotype = SOCK_DGRAM;
  114                 else if (strncmp(o, "rsize=", 6) == 0) {
  115                         v = strtoul(o+6, NULL, 10);
  116                         if (checkrwsize(v, "rsize")) {
  117                                 nd->rsize = (int) v;
  118                                 nd->flags |= NFSMNT_RSIZE;
  119                         }
  120                 } else if (strncmp(o, "wsize=", 6) == 0) {
  121                         v = strtoul(o+6, NULL, 10);
  122                         if (checkrwsize(v, "wsize")) {
  123                                 nd->wsize = (int) v;
  124                                 nd->flags |= NFSMNT_WSIZE;
  125                         }
  126                 } else
  127                         printf("%s: skipping unknown option \"%s\"\n",
  128                             __func__, o);
  129         }
  130         free(opts, M_TEMP);
  131 }
  132 
  133 /*
  134  * Populate the essential fields in the nfsv3_diskless structure.
  135  *
  136  * The loader is expected to export the following environment variables:
  137  *
  138  * boot.netif.name              name of boot interface
  139  * boot.netif.ip                IP address on boot interface
  140  * boot.netif.netmask           netmask on boot interface
  141  * boot.netif.gateway           default gateway (optional)
  142  * boot.netif.hwaddr            hardware address of boot interface
  143  * boot.nfsroot.server          IP address of root filesystem server
  144  * boot.nfsroot.path            path of the root filesystem on server
  145  * boot.nfsroot.nfshandle       NFS handle for root filesystem on server
  146  * boot.nfsroot.options         NFS options for the root filesystem
  147  */
  148 void
  149 nfs_setup_diskless(void)
  150 {
  151         struct nfs_diskless *nd = &nfs_diskless;
  152         struct ifnet *ifp;
  153         struct ifaddr *ifa;
  154         struct sockaddr_dl *sdl, ourdl;
  155         struct sockaddr_in myaddr, netmask;
  156         char *cp;
  157 
  158         if (nfs_diskless_valid)
  159                 return;
  160         /* set up interface */
  161         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
  162                 return;
  163         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
  164                 printf("nfs_diskless: no netmask\n");
  165                 return;
  166         }
  167         bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
  168         bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
  169         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
  170                 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  171         bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
  172 
  173         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  174                 printf("nfs_diskless: no hardware address\n");
  175                 return;
  176         }
  177         ifa = NULL;
  178         IFNET_RLOCK();
  179         TAILQ_FOREACH(ifp, &ifnet, if_link) {
  180                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  181                         if (ifa->ifa_addr->sa_family == AF_LINK) {
  182                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  183                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  184                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  185                                     !bcmp(LLADDR(sdl),
  186                                           LLADDR(&ourdl),
  187                                           sdl->sdl_alen)) {
  188                                     IFNET_RUNLOCK();
  189                                     goto match_done;
  190                                 }
  191                         }
  192                 }
  193         }
  194         IFNET_RUNLOCK();
  195         printf("nfs_diskless: no interface\n");
  196         return; /* no matching interface */
  197 match_done:
  198         setenv("boot.netif.name", ifp->if_xname);
  199         strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
  200         
  201         /* set up gateway */
  202         inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  203 
  204         /* set up root mount */
  205         nd->root_args.rsize = 8192;             /* XXX tunable? */
  206         nd->root_args.wsize = 8192;
  207         nd->root_args.sotype = SOCK_DGRAM;
  208         nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
  209         if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
  210                 printf("nfs_diskless: no server\n");
  211                 return;
  212         }
  213         nd->root_saddr.sin_port = htons(NFS_PORT);
  214         if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
  215                 printf("nfs_diskless: no NFS handle\n");
  216                 return;
  217         }
  218         if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  219                 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  220                 freeenv(cp);
  221         }
  222         if ((cp = getenv("boot.nfsroot.options")) != NULL) {
  223                 struct nfs_args args;
  224 
  225                 /* XXX yech, convert between old and current arg format */
  226                 args.flags = nd->root_args.flags;
  227                 args.sotype = nd->root_args.sotype;
  228                 args.rsize = nd->root_args.rsize;
  229                 args.wsize = nd->root_args.wsize;
  230                 nfs_parse_options(cp, &args);
  231                 nd->root_args.flags = args.flags;
  232                 nd->root_args.sotype = args.sotype;
  233                 nd->root_args.rsize = args.rsize;
  234                 nd->root_args.wsize = args.wsize;
  235                 freeenv(cp);
  236         }
  237 
  238         nfs_diskless_valid = 1;
  239 }
  240 
  241 static int
  242 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  243 {
  244         u_int32_t a[4];
  245         char *cp;
  246         int count;
  247 
  248         bzero(sa, sizeof(*sa));
  249         sa->sin_len = sizeof(*sa);
  250         sa->sin_family = AF_INET;
  251 
  252         if ((cp = getenv(ev)) == NULL)
  253                 return (1);
  254         count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
  255         freeenv(cp);
  256         if (count != 4)
  257                 return (1);
  258         sa->sin_addr.s_addr =
  259             htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
  260         return (0);
  261 }
  262 
  263 static int
  264 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  265 {
  266         char *cp;
  267         u_int32_t a[6];
  268         int count;
  269 
  270         bzero(sa, sizeof(*sa));
  271         sa->sdl_len = sizeof(*sa);
  272         sa->sdl_family = AF_LINK;
  273         sa->sdl_type = IFT_ETHER;
  274         sa->sdl_alen = ETHER_ADDR_LEN;
  275         if ((cp = getenv(ev)) == NULL)
  276                 return (1);
  277         count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
  278             &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
  279         freeenv(cp);
  280         if (count != 6)
  281                 return (1);
  282         sa->sdl_data[0] = a[0];
  283         sa->sdl_data[1] = a[1];
  284         sa->sdl_data[2] = a[2];
  285         sa->sdl_data[3] = a[3];
  286         sa->sdl_data[4] = a[4];
  287         sa->sdl_data[5] = a[5];
  288         return (0);
  289 }
  290 
  291 static int
  292 decode_nfshandle(char *ev, u_char *fh) 
  293 {
  294         u_char *cp, *ep;
  295         int len, val;
  296 
  297         ep = cp = getenv(ev);
  298         if (cp == NULL)
  299                 return (0);
  300         if ((strlen(cp) < 2) || (*cp != 'X')) {
  301                 freeenv(ep);
  302                 return (0);
  303         }
  304         len = 0;
  305         cp++;
  306         for (;;) {
  307                 if (*cp == 'X') {
  308                         freeenv(ep);
  309                         return (len);
  310                 }
  311                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
  312                         freeenv(ep);
  313                         return (0);
  314                 }
  315                 *(fh++) = val;
  316                 len++;
  317                 cp += 2;
  318                 if (len > NFSX_V2FH) {
  319                     freeenv(ep);
  320                     return (0);
  321                 }
  322         }
  323 }
  324 
  325 #if !defined(BOOTP_NFSROOT)
  326 static void
  327 nfs_rootconf(void)
  328 {
  329 
  330         nfs_setup_diskless();
  331         if (nfs_diskless_valid)
  332                 rootdevnames[0] = "nfs:";
  333 }
  334 
  335 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL)
  336 #endif
  337 

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