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/11.2/sys/nfs/nfs_diskless.c 331722 2018-03-29 02:50:57Z eadler $");
   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 #define NFS_IFACE_TIMEOUT_SECS  10 /* Timeout for interface to appear. */
   61 
   62 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
   63 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
   64 static int decode_nfshandle(char *ev, u_char *fh, int maxfh);
   65 
   66 /*
   67  * This structure must be filled in by a primary bootstrap or bootstrap
   68  * server for a diskless/dataless machine. It is initialized below just
   69  * to ensure that it is allocated to initialized data (.data not .bss).
   70  */
   71 struct nfs_diskless     nfs_diskless = { { { 0 } } };
   72 struct nfsv3_diskless   nfsv3_diskless = { { { 0 } } };
   73 int                     nfs_diskless_valid = 0;
   74 
   75 /*
   76  * Validate/sanity check a rsize/wsize parameter.
   77  */
   78 static int
   79 checkrwsize(unsigned long v, const char *name)
   80 {
   81         /*
   82          * 32K is used as an upper bound because most servers
   83          * limit block size to satisfy IPv4's limit of
   84          * 64K/reassembled packet.  The lower bound is pretty
   85          * much arbitrary.
   86          */
   87         if (!(4 <= v && v <= 32*1024)) {
   88                 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
   89                 return 0;
   90         } else
   91                 return 1;
   92 }
   93 
   94 /*
   95  * Parse mount options and apply them to the supplied
   96  * nfs_diskless state.  Used also by bootp/dhcp support.
   97  */
   98 void
   99 nfs_parse_options(const char *envopts, struct nfs_args *nd)
  100 {
  101         char *opts, *o, *otmp;
  102         unsigned long v;
  103 
  104         opts = strdup(envopts, M_TEMP);
  105         otmp = opts;
  106         while ((o = strsep(&otmp, ":;, ")) != NULL) {
  107                 if (*o == '\0')
  108                         ; /* Skip empty options. */
  109                 else if (strcmp(o, "soft") == 0)
  110                         nd->flags |= NFSMNT_SOFT;
  111                 else if (strcmp(o, "intr") == 0)
  112                         nd->flags |= NFSMNT_INT;
  113                 else if (strcmp(o, "conn") == 0)
  114                         nd->flags |= NFSMNT_NOCONN;
  115                 else if (strcmp(o, "nolockd") == 0)
  116                         nd->flags |= NFSMNT_NOLOCKD;
  117                 else if (strcmp(o, "nocto") == 0)
  118                         nd->flags |= NFSMNT_NOCTO;
  119                 else if (strcmp(o, "nfsv2") == 0)
  120                         nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
  121                 else if (strcmp(o, "nfsv3") == 0) {
  122                         nd->flags &= ~NFSMNT_NFSV4;
  123                         nd->flags |= NFSMNT_NFSV3;
  124                 } else if (strcmp(o, "tcp") == 0)
  125                         nd->sotype = SOCK_STREAM;
  126                 else if (strcmp(o, "udp") == 0)
  127                         nd->sotype = SOCK_DGRAM;
  128                 else if (strncmp(o, "rsize=", 6) == 0) {
  129                         v = strtoul(o+6, NULL, 10);
  130                         if (checkrwsize(v, "rsize")) {
  131                                 nd->rsize = (int) v;
  132                                 nd->flags |= NFSMNT_RSIZE;
  133                         }
  134                 } else if (strncmp(o, "wsize=", 6) == 0) {
  135                         v = strtoul(o+6, NULL, 10);
  136                         if (checkrwsize(v, "wsize")) {
  137                                 nd->wsize = (int) v;
  138                                 nd->flags |= NFSMNT_WSIZE;
  139                         }
  140                 } else
  141                         printf("%s: skipping unknown option \"%s\"\n",
  142                             __func__, o);
  143         }
  144         free(opts, M_TEMP);
  145 }
  146 
  147 /*
  148  * Populate the essential fields in the nfsv3_diskless structure.
  149  *
  150  * The loader is expected to export the following environment variables:
  151  *
  152  * boot.netif.name              name of boot interface
  153  * boot.netif.ip                IP address on boot interface
  154  * boot.netif.netmask           netmask on boot interface
  155  * boot.netif.gateway           default gateway (optional)
  156  * boot.netif.hwaddr            hardware address of boot interface
  157  * boot.netif.mtu               interface mtu from bootp/dhcp (optional)
  158  * boot.nfsroot.server          IP address of root filesystem server
  159  * boot.nfsroot.path            path of the root filesystem on server
  160  * boot.nfsroot.nfshandle       NFS handle for root filesystem on server
  161  * boot.nfsroot.nfshandlelen    and length of this handle (for NFSv3 only)
  162  * boot.nfsroot.options         NFS options for the root filesystem
  163  */
  164 void
  165 nfs_setup_diskless(void)
  166 {
  167         struct nfs_diskless *nd = &nfs_diskless;
  168         struct nfsv3_diskless *nd3 = &nfsv3_diskless;
  169         struct ifnet *ifp;
  170         struct ifaddr *ifa;
  171         struct sockaddr_dl *sdl, ourdl;
  172         struct sockaddr_in myaddr, netmask;
  173         char *cp;
  174         int cnt, fhlen, is_nfsv3;
  175         uint32_t len;
  176         time_t timeout_at;
  177 
  178         if (nfs_diskless_valid != 0)
  179                 return;
  180 
  181         /* get handle size. If this succeeds, it's an NFSv3 setup. */
  182         if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) {
  183                 cnt = sscanf(cp, "%d", &len);
  184                 freeenv(cp);
  185                 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
  186                         printf("nfs_diskless: bad NFS handle len\n");
  187                         return;
  188                 }
  189                 nd3->root_fhsize = len;
  190                 is_nfsv3 = 1;
  191         } else
  192                 is_nfsv3 = 0;
  193         /* set up interface */
  194         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
  195                 return;
  196         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
  197                 printf("nfs_diskless: no netmask\n");
  198                 return;
  199         }
  200         if (is_nfsv3 != 0) {
  201                 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
  202                 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
  203                 ((struct sockaddr_in *) 
  204                    &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
  205                     myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  206                 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
  207         } else {
  208                 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
  209                 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
  210                 ((struct sockaddr_in *) 
  211                    &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
  212                     myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  213                 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
  214         }
  215 
  216         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  217                 printf("nfs_diskless: no hardware address\n");
  218                 return;
  219         }
  220         ifa = NULL;
  221         timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS;
  222 retry:
  223         CURVNET_SET(TD_TO_VNET(curthread));
  224         IFNET_RLOCK();
  225         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  226                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  227                         if (ifa->ifa_addr->sa_family == AF_LINK) {
  228                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  229                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  230                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  231                                     !bcmp(LLADDR(sdl),
  232                                           LLADDR(&ourdl),
  233                                           sdl->sdl_alen)) {
  234                                     IFNET_RUNLOCK();
  235                                     CURVNET_RESTORE();
  236                                     goto match_done;
  237                                 }
  238                         }
  239                 }
  240         }
  241         IFNET_RUNLOCK();
  242         CURVNET_RESTORE();
  243         if (time_uptime < timeout_at) {
  244                 pause("nfssdl", hz / 5);
  245                 goto retry;
  246         }
  247         printf("nfs_diskless: no interface\n");
  248         return; /* no matching interface */
  249 match_done:
  250         kern_setenv("boot.netif.name", ifp->if_xname);
  251         if (is_nfsv3 != 0) {
  252                 strlcpy(nd3->myif.ifra_name, ifp->if_xname,
  253                     sizeof(nd3->myif.ifra_name));
  254         
  255                 /* set up gateway */
  256                 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
  257 
  258                 /* set up root mount */
  259                 nd3->root_args.rsize = 32768;           /* XXX tunable? */
  260                 nd3->root_args.wsize = 32768;
  261                 nd3->root_args.sotype = SOCK_STREAM;
  262                 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
  263                     NFSMNT_RSIZE | NFSMNT_RESVPORT);
  264                 if (inaddr_to_sockaddr("boot.nfsroot.server",
  265                     &nd3->root_saddr)) {
  266                         printf("nfs_diskless: no server\n");
  267                         return;
  268                 }
  269                 nd3->root_saddr.sin_port = htons(NFS_PORT);
  270                 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
  271                     &nd3->root_fh[0], NFSX_V3FHMAX);
  272                 if (fhlen == 0) {
  273                         printf("nfs_diskless: no NFS handle\n");
  274                         return;
  275                 }
  276                 if (fhlen != nd3->root_fhsize) {
  277                         printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
  278                         return;
  279                 }
  280                 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
  281                         strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
  282                         freeenv(cp);
  283                 }
  284                 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
  285                         nfs_parse_options(cp, &nd3->root_args);
  286                         freeenv(cp);
  287                 }
  288         
  289                 nfs_diskless_valid = 3;
  290         } else {
  291                 strlcpy(nd->myif.ifra_name, ifp->if_xname,
  292                     sizeof(nd->myif.ifra_name));
  293         
  294                 /* set up gateway */
  295                 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  296 
  297                 /* set up root mount */
  298                 nd->root_args.rsize = 8192;             /* XXX tunable? */
  299                 nd->root_args.wsize = 8192;
  300                 nd->root_args.sotype = SOCK_STREAM;
  301                 nd->root_args.flags = (NFSMNT_WSIZE |
  302                     NFSMNT_RSIZE | NFSMNT_RESVPORT);
  303                 if (inaddr_to_sockaddr("boot.nfsroot.server",
  304                     &nd->root_saddr)) {
  305                         printf("nfs_diskless: no server\n");
  306                         return;
  307                 }
  308                 nd->root_saddr.sin_port = htons(NFS_PORT);
  309                 if (decode_nfshandle("boot.nfsroot.nfshandle",
  310                     &nd->root_fh[0], NFSX_V2FH) == 0) {
  311                         printf("nfs_diskless: no NFS handle\n");
  312                         return;
  313                 }
  314                 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
  315                         strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  316                         freeenv(cp);
  317                 }
  318                 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
  319                         struct nfs_args args;
  320         
  321                         /*
  322                          * XXX yech, convert between old and current
  323                          * arg format
  324                          */
  325                         args.flags = nd->root_args.flags;
  326                         args.sotype = nd->root_args.sotype;
  327                         args.rsize = nd->root_args.rsize;
  328                         args.wsize = nd->root_args.wsize;
  329                         nfs_parse_options(cp, &args);
  330                         nd->root_args.flags = args.flags;
  331                         nd->root_args.sotype = args.sotype;
  332                         nd->root_args.rsize = args.rsize;
  333                         nd->root_args.wsize = args.wsize;
  334                         freeenv(cp);
  335                 }
  336         
  337                 nfs_diskless_valid = 1;
  338         }
  339 }
  340 
  341 static int
  342 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  343 {
  344         u_int32_t a[4];
  345         char *cp;
  346         int count;
  347 
  348         bzero(sa, sizeof(*sa));
  349         sa->sin_len = sizeof(*sa);
  350         sa->sin_family = AF_INET;
  351 
  352         if ((cp = kern_getenv(ev)) == NULL)
  353                 return (1);
  354         count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
  355         freeenv(cp);
  356         if (count != 4)
  357                 return (1);
  358         sa->sin_addr.s_addr =
  359             htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
  360         return (0);
  361 }
  362 
  363 static int
  364 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  365 {
  366         char *cp;
  367         u_int32_t a[6];
  368         int count;
  369 
  370         bzero(sa, sizeof(*sa));
  371         sa->sdl_len = sizeof(*sa);
  372         sa->sdl_family = AF_LINK;
  373         sa->sdl_type = IFT_ETHER;
  374         sa->sdl_alen = ETHER_ADDR_LEN;
  375         if ((cp = kern_getenv(ev)) == NULL)
  376                 return (1);
  377         count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
  378             &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
  379         freeenv(cp);
  380         if (count != 6)
  381                 return (1);
  382         sa->sdl_data[0] = a[0];
  383         sa->sdl_data[1] = a[1];
  384         sa->sdl_data[2] = a[2];
  385         sa->sdl_data[3] = a[3];
  386         sa->sdl_data[4] = a[4];
  387         sa->sdl_data[5] = a[5];
  388         return (0);
  389 }
  390 
  391 static int
  392 decode_nfshandle(char *ev, u_char *fh, int maxfh) 
  393 {
  394         u_char *cp, *ep;
  395         int len, val;
  396 
  397         ep = cp = kern_getenv(ev);
  398         if (cp == NULL)
  399                 return (0);
  400         if ((strlen(cp) < 2) || (*cp != 'X')) {
  401                 freeenv(ep);
  402                 return (0);
  403         }
  404         len = 0;
  405         cp++;
  406         for (;;) {
  407                 if (*cp == 'X') {
  408                         freeenv(ep);
  409                         return (len);
  410                 }
  411                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
  412                         freeenv(ep);
  413                         return (0);
  414                 }
  415                 *(fh++) = val;
  416                 len++;
  417                 cp += 2;
  418                 if (len > maxfh) {
  419                     freeenv(ep);
  420                     return (0);
  421                 }
  422         }
  423 }
  424 
  425 #if !defined(BOOTP_NFSROOT)
  426 static void
  427 nfs_rootconf(void)
  428 {
  429 
  430         nfs_setup_diskless();
  431         if (nfs_diskless_valid)
  432                 rootdevnames[0] = "nfs:";
  433 }
  434 
  435 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
  436 #endif
  437
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FreeBSD/Linux Kernel Cross Reference sys/nfs/nfs_diskless.c

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