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: releng/8.3/sys/nfs/nfs_diskless.c 222056 2011-05-18 14:02:33Z ru $");
   37 
   38 #include "opt_bootp.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/jail.h>
   43 #include <sys/kernel.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mount.h>
   46 #include <sys/socket.h>
   47 
   48 #include <net/if.h>
   49 #include <net/if_dl.h>
   50 #include <net/if_types.h>
   51 #include <net/if_var.h>
   52 #include <net/ethernet.h>
   53 #include <net/vnet.h>
   54 
   55 #include <netinet/in.h>
   56 #include <nfs/nfsproto.h>
   57 #include <nfsclient/nfs.h>
   58 #include <nfs/nfsdiskless.h>
   59 
   60 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
   61 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
   62 static int decode_nfshandle(char *ev, u_char *fh, int maxfh);
   63 
   64 /*
   65  * This structure must be filled in by a primary bootstrap or bootstrap
   66  * server for a diskless/dataless machine. It is initialized below just
   67  * to ensure that it is allocated to initialized data (.data not .bss).
   68  */
   69 struct nfs_diskless     nfs_diskless = { { { 0 } } };
   70 struct nfsv3_diskless   nfsv3_diskless = { { { 0 } } };
   71 int                     nfs_diskless_valid = 0;
   72 
   73 /*
   74  * Validate/sanity check a rsize/wsize parameter.
   75  */
   76 static int
   77 checkrwsize(unsigned long v, const char *name)
   78 {
   79         /*
   80          * 32K is used as an upper bound because most servers
   81          * limit block size to satisfy IPv4's limit of
   82          * 64K/reassembled packet.  The lower bound is pretty
   83          * much arbitrary.
   84          */
   85         if (!(4 <= v && v <= 32*1024)) {
   86                 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
   87                 return 0;
   88         } else
   89                 return 1;
   90 }
   91 
   92 /*
   93  * Parse mount options and apply them to the supplied
   94  * nfs_diskless state.  Used also by bootp/dhcp support.
   95  */
   96 void
   97 nfs_parse_options(const char *envopts, struct nfs_args *nd)
   98 {
   99         char *opts, *o, *otmp;
  100         unsigned long v;
  101 
  102         opts = strdup(envopts, M_TEMP);
  103         otmp = opts;
  104         while ((o = strsep(&otmp, ":;, ")) != NULL) {
  105                 if (*o == '\0')
  106                         ; /* Skip empty options. */
  107                 else if (strcmp(o, "soft") == 0)
  108                         nd->flags |= NFSMNT_SOFT;
  109                 else if (strcmp(o, "intr") == 0)
  110                         nd->flags |= NFSMNT_INT;
  111                 else if (strcmp(o, "conn") == 0)
  112                         nd->flags |= NFSMNT_NOCONN;
  113                 else if (strcmp(o, "nolockd") == 0)
  114                         nd->flags |= NFSMNT_NOLOCKD;
  115                 else if (strcmp(o, "nocto") == 0)
  116                         nd->flags |= NFSMNT_NOCTO;
  117                 else if (strcmp(o, "nfsv2") == 0)
  118                         nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
  119                 else if (strcmp(o, "nfsv3") == 0) {
  120                         nd->flags &= ~NFSMNT_NFSV4;
  121                         nd->flags |= NFSMNT_NFSV3;
  122                 } else if (strcmp(o, "tcp") == 0)
  123                         nd->sotype = SOCK_STREAM;
  124                 else if (strcmp(o, "udp") == 0)
  125                         nd->sotype = SOCK_DGRAM;
  126                 else if (strncmp(o, "rsize=", 6) == 0) {
  127                         v = strtoul(o+6, NULL, 10);
  128                         if (checkrwsize(v, "rsize")) {
  129                                 nd->rsize = (int) v;
  130                                 nd->flags |= NFSMNT_RSIZE;
  131                         }
  132                 } else if (strncmp(o, "wsize=", 6) == 0) {
  133                         v = strtoul(o+6, NULL, 10);
  134                         if (checkrwsize(v, "wsize")) {
  135                                 nd->wsize = (int) v;
  136                                 nd->flags |= NFSMNT_WSIZE;
  137                         }
  138                 } else
  139                         printf("%s: skipping unknown option \"%s\"\n",
  140                             __func__, o);
  141         }
  142         free(opts, M_TEMP);
  143 }
  144 
  145 /*
  146  * Populate the essential fields in the nfsv3_diskless structure.
  147  *
  148  * The loader is expected to export the following environment variables:
  149  *
  150  * boot.netif.name              name of boot interface
  151  * boot.netif.ip                IP address on boot interface
  152  * boot.netif.netmask           netmask on boot interface
  153  * boot.netif.gateway           default gateway (optional)
  154  * boot.netif.hwaddr            hardware address of boot interface
  155  * boot.nfsroot.server          IP address of root filesystem server
  156  * boot.nfsroot.path            path of the root filesystem on server
  157  * boot.nfsroot.nfshandle       NFS handle for root filesystem on server
  158  * boot.nfsroot.nfshandlelen    and length of this handle (for NFSv3 only)
  159  * boot.nfsroot.options         NFS options for the root filesystem
  160  */
  161 void
  162 nfs_setup_diskless(void)
  163 {
  164         struct nfs_diskless *nd = &nfs_diskless;
  165         struct nfsv3_diskless *nd3 = &nfsv3_diskless;
  166         struct ifnet *ifp;
  167         struct ifaddr *ifa;
  168         struct sockaddr_dl *sdl, ourdl;
  169         struct sockaddr_in myaddr, netmask;
  170         char *cp;
  171         int cnt, fhlen, is_nfsv3;
  172         uint32_t len;
  173 
  174         if (nfs_diskless_valid != 0)
  175                 return;
  176 
  177         /* get handle size. If this succeeds, it's an NFSv3 setup. */
  178         if ((cp = getenv("boot.nfsroot.nfshandlelen")) != NULL) {
  179                 cnt = sscanf(cp, "%d", &len);
  180                 freeenv(cp);
  181                 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
  182                         printf("nfs_diskless: bad NFS handle len\n");
  183                         return;
  184                 }
  185                 nd3->root_fhsize = len;
  186                 is_nfsv3 = 1;
  187         } else
  188                 is_nfsv3 = 0;
  189         /* set up interface */
  190         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
  191                 return;
  192         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
  193                 printf("nfs_diskless: no netmask\n");
  194                 return;
  195         }
  196         if (is_nfsv3 != 0) {
  197                 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
  198                 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
  199                 ((struct sockaddr_in *) 
  200                    &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
  201                     myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  202                 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
  203         } else {
  204                 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
  205                 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
  206                 ((struct sockaddr_in *) 
  207                    &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
  208                     myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  209                 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
  210         }
  211 
  212         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  213                 printf("nfs_diskless: no hardware address\n");
  214                 return;
  215         }
  216         ifa = NULL;
  217         CURVNET_SET(TD_TO_VNET(curthread));
  218         IFNET_RLOCK();
  219         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  220                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  221                         if (ifa->ifa_addr->sa_family == AF_LINK) {
  222                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  223                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  224                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  225                                     !bcmp(LLADDR(sdl),
  226                                           LLADDR(&ourdl),
  227                                           sdl->sdl_alen)) {
  228                                     IFNET_RUNLOCK();
  229                                     CURVNET_RESTORE();
  230                                     goto match_done;
  231                                 }
  232                         }
  233                 }
  234         }
  235         IFNET_RUNLOCK();
  236         CURVNET_RESTORE();
  237         printf("nfs_diskless: no interface\n");
  238         return; /* no matching interface */
  239 match_done:
  240         setenv("boot.netif.name", ifp->if_xname);
  241         if (is_nfsv3 != 0) {
  242                 strlcpy(nd3->myif.ifra_name, ifp->if_xname,
  243                     sizeof(nd3->myif.ifra_name));
  244         
  245                 /* set up gateway */
  246                 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
  247 
  248                 /* set up root mount */
  249                 nd3->root_args.rsize = 32768;           /* XXX tunable? */
  250                 nd3->root_args.wsize = 32768;
  251                 nd3->root_args.sotype = SOCK_STREAM;
  252                 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
  253                     NFSMNT_RSIZE | NFSMNT_RESVPORT);
  254                 if (inaddr_to_sockaddr("boot.nfsroot.server",
  255                     &nd3->root_saddr)) {
  256                         printf("nfs_diskless: no server\n");
  257                         return;
  258                 }
  259                 nd3->root_saddr.sin_port = htons(NFS_PORT);
  260                 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
  261                     &nd3->root_fh[0], NFSX_V3FHMAX);
  262                 if (fhlen == 0) {
  263                         printf("nfs_diskless: no NFS handle\n");
  264                         return;
  265                 }
  266                 if (fhlen != nd3->root_fhsize) {
  267                         printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
  268                         return;
  269                 }
  270                 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  271                         strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
  272                         freeenv(cp);
  273                 }
  274                 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
  275                         nfs_parse_options(cp, &nd3->root_args);
  276                         freeenv(cp);
  277                 }
  278         
  279                 nfs_diskless_valid = 3;
  280         } else {
  281                 strlcpy(nd->myif.ifra_name, ifp->if_xname,
  282                     sizeof(nd->myif.ifra_name));
  283         
  284                 /* set up gateway */
  285                 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  286 
  287                 /* set up root mount */
  288                 nd->root_args.rsize = 8192;             /* XXX tunable? */
  289                 nd->root_args.wsize = 8192;
  290                 nd->root_args.sotype = SOCK_STREAM;
  291                 nd->root_args.flags = (NFSMNT_WSIZE |
  292                     NFSMNT_RSIZE | NFSMNT_RESVPORT);
  293                 if (inaddr_to_sockaddr("boot.nfsroot.server",
  294                     &nd->root_saddr)) {
  295                         printf("nfs_diskless: no server\n");
  296                         return;
  297                 }
  298                 nd->root_saddr.sin_port = htons(NFS_PORT);
  299                 if (decode_nfshandle("boot.nfsroot.nfshandle",
  300                     &nd->root_fh[0], NFSX_V2FH) == 0) {
  301                         printf("nfs_diskless: no NFS handle\n");
  302                         return;
  303                 }
  304                 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  305                         strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  306                         freeenv(cp);
  307                 }
  308                 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
  309                         struct nfs_args args;
  310         
  311                         /*
  312                          * XXX yech, convert between old and current
  313                          * arg format
  314                          */
  315                         args.flags = nd->root_args.flags;
  316                         args.sotype = nd->root_args.sotype;
  317                         args.rsize = nd->root_args.rsize;
  318                         args.wsize = nd->root_args.wsize;
  319                         nfs_parse_options(cp, &args);
  320                         nd->root_args.flags = args.flags;
  321                         nd->root_args.sotype = args.sotype;
  322                         nd->root_args.rsize = args.rsize;
  323                         nd->root_args.wsize = args.wsize;
  324                         freeenv(cp);
  325                 }
  326         
  327                 nfs_diskless_valid = 1;
  328         }
  329 }
  330 
  331 static int
  332 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  333 {
  334         u_int32_t a[4];
  335         char *cp;
  336         int count;
  337 
  338         bzero(sa, sizeof(*sa));
  339         sa->sin_len = sizeof(*sa);
  340         sa->sin_family = AF_INET;
  341 
  342         if ((cp = getenv(ev)) == NULL)
  343                 return (1);
  344         count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
  345         freeenv(cp);
  346         if (count != 4)
  347                 return (1);
  348         sa->sin_addr.s_addr =
  349             htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
  350         return (0);
  351 }
  352 
  353 static int
  354 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  355 {
  356         char *cp;
  357         u_int32_t a[6];
  358         int count;
  359 
  360         bzero(sa, sizeof(*sa));
  361         sa->sdl_len = sizeof(*sa);
  362         sa->sdl_family = AF_LINK;
  363         sa->sdl_type = IFT_ETHER;
  364         sa->sdl_alen = ETHER_ADDR_LEN;
  365         if ((cp = getenv(ev)) == NULL)
  366                 return (1);
  367         count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
  368             &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
  369         freeenv(cp);
  370         if (count != 6)
  371                 return (1);
  372         sa->sdl_data[0] = a[0];
  373         sa->sdl_data[1] = a[1];
  374         sa->sdl_data[2] = a[2];
  375         sa->sdl_data[3] = a[3];
  376         sa->sdl_data[4] = a[4];
  377         sa->sdl_data[5] = a[5];
  378         return (0);
  379 }
  380 
  381 static int
  382 decode_nfshandle(char *ev, u_char *fh, int maxfh) 
  383 {
  384         u_char *cp, *ep;
  385         int len, val;
  386 
  387         ep = cp = getenv(ev);
  388         if (cp == NULL)
  389                 return (0);
  390         if ((strlen(cp) < 2) || (*cp != 'X')) {
  391                 freeenv(ep);
  392                 return (0);
  393         }
  394         len = 0;
  395         cp++;
  396         for (;;) {
  397                 if (*cp == 'X') {
  398                         freeenv(ep);
  399                         return (len);
  400                 }
  401                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
  402                         freeenv(ep);
  403                         return (0);
  404                 }
  405                 *(fh++) = val;
  406                 len++;
  407                 cp += 2;
  408                 if (len > maxfh) {
  409                     freeenv(ep);
  410                     return (0);
  411                 }
  412         }
  413 }
  414 
  415 #if !defined(BOOTP_NFSROOT)
  416 static void
  417 nfs_rootconf(void)
  418 {
  419 
  420         nfs_setup_diskless();
  421         if (nfs_diskless_valid)
  422                 rootdevnames[0] = "nfs:";
  423 }
  424 
  425 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
  426 #endif
  427
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FreeBSD/Linux Kernel Cross Reference sys/nfs/nfs_diskless.c

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