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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/8.2/sys/nfsclient/nfs_diskless.c 212716 2010-09-16 01:02:53Z rmacklem $");
   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 #include <sys/socket.h>
   46 
   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 <net/vnet.h>
   53 
   54 #include <netinet/in.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, int maxfh);
   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.nfshandlelen    and length of this handle (for NFSv3 only)
  147  * boot.nfsroot.options         NFS options for the root filesystem
  148  */
  149 void
  150 nfs_setup_diskless(void)
  151 {
  152         struct nfs_diskless *nd = &nfs_diskless;
  153         struct nfsv3_diskless *nd3 = &nfsv3_diskless;
  154         struct ifnet *ifp;
  155         struct ifaddr *ifa;
  156         struct sockaddr_dl *sdl, ourdl;
  157         struct sockaddr_in myaddr, netmask;
  158         char *cp;
  159         int cnt, fhlen, is_nfsv3;
  160         uint32_t len;
  161 
  162         if (nfs_diskless_valid != 0)
  163                 return;
  164 
  165         /* get handle size. If this succeeds, it's an NFSv3 setup. */
  166         if ((cp = getenv("boot.nfsroot.nfshandlelen")) != NULL) {
  167                 cnt = sscanf(cp, "%d", &len);
  168                 freeenv(cp);
  169                 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
  170                         printf("nfs_diskless: bad NFS handle len\n");
  171                         return;
  172                 }
  173                 nd3->root_fhsize = len;
  174                 is_nfsv3 = 1;
  175         } else
  176                 is_nfsv3 = 0;
  177         /* set up interface */
  178         if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
  179                 return;
  180         if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
  181                 printf("nfs_diskless: no netmask\n");
  182                 return;
  183         }
  184         if (is_nfsv3 != 0) {
  185                 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
  186                 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
  187                 ((struct sockaddr_in *) 
  188                    &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
  189                     myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  190                 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
  191         } else {
  192                 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
  193                 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
  194                 ((struct sockaddr_in *) 
  195                    &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
  196                     myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
  197                 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
  198         }
  199 
  200         if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
  201                 printf("nfs_diskless: no hardware address\n");
  202                 return;
  203         }
  204         ifa = NULL;
  205         IFNET_RLOCK();
  206         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  207                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  208                         if (ifa->ifa_addr->sa_family == AF_LINK) {
  209                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  210                                 if ((sdl->sdl_type == ourdl.sdl_type) &&
  211                                     (sdl->sdl_alen == ourdl.sdl_alen) &&
  212                                     !bcmp(LLADDR(sdl),
  213                                           LLADDR(&ourdl),
  214                                           sdl->sdl_alen)) {
  215                                     IFNET_RUNLOCK();
  216                                     goto match_done;
  217                                 }
  218                         }
  219                 }
  220         }
  221         IFNET_RUNLOCK();
  222         printf("nfs_diskless: no interface\n");
  223         return; /* no matching interface */
  224 match_done:
  225         setenv("boot.netif.name", ifp->if_xname);
  226         if (is_nfsv3 != 0) {
  227                 strlcpy(nd3->myif.ifra_name, ifp->if_xname,
  228                     sizeof(nd3->myif.ifra_name));
  229         
  230                 /* set up gateway */
  231                 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
  232 
  233                 /* set up root mount */
  234                 nd3->root_args.rsize = 32768;           /* XXX tunable? */
  235                 nd3->root_args.wsize = 32768;
  236                 nd3->root_args.sotype = SOCK_STREAM;
  237                 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
  238                     NFSMNT_RSIZE | NFSMNT_RESVPORT);
  239                 if (inaddr_to_sockaddr("boot.nfsroot.server",
  240                     &nd3->root_saddr)) {
  241                         printf("nfs_diskless: no server\n");
  242                         return;
  243                 }
  244                 nd3->root_saddr.sin_port = htons(NFS_PORT);
  245                 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
  246                     &nd3->root_fh[0], NFSX_V3FHMAX);
  247                 if (fhlen == 0) {
  248                         printf("nfs_diskless: no NFS handle\n");
  249                         return;
  250                 }
  251                 if (fhlen != nd3->root_fhsize) {
  252                         printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
  253                         return;
  254                 }
  255                 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  256                         strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
  257                         freeenv(cp);
  258                 }
  259                 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
  260                         nfs_parse_options(cp, &nd3->root_args);
  261                         freeenv(cp);
  262                 }
  263         
  264                 nfs_diskless_valid = 3;
  265         } else {
  266                 strlcpy(nd->myif.ifra_name, ifp->if_xname,
  267                     sizeof(nd->myif.ifra_name));
  268         
  269                 /* set up gateway */
  270                 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
  271 
  272                 /* set up root mount */
  273                 nd->root_args.rsize = 8192;             /* XXX tunable? */
  274                 nd->root_args.wsize = 8192;
  275                 nd->root_args.sotype = SOCK_STREAM;
  276                 nd->root_args.flags = (NFSMNT_WSIZE |
  277                     NFSMNT_RSIZE | NFSMNT_RESVPORT);
  278                 if (inaddr_to_sockaddr("boot.nfsroot.server",
  279                     &nd->root_saddr)) {
  280                         printf("nfs_diskless: no server\n");
  281                         return;
  282                 }
  283                 nd->root_saddr.sin_port = htons(NFS_PORT);
  284                 if (decode_nfshandle("boot.nfsroot.nfshandle",
  285                     &nd->root_fh[0], NFSX_V2FH) == 0) {
  286                         printf("nfs_diskless: no NFS handle\n");
  287                         return;
  288                 }
  289                 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
  290                         strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
  291                         freeenv(cp);
  292                 }
  293                 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
  294                         struct nfs_args args;
  295         
  296                         /*
  297                          * XXX yech, convert between old and current
  298                          * arg format
  299                          */
  300                         args.flags = nd->root_args.flags;
  301                         args.sotype = nd->root_args.sotype;
  302                         args.rsize = nd->root_args.rsize;
  303                         args.wsize = nd->root_args.wsize;
  304                         nfs_parse_options(cp, &args);
  305                         nd->root_args.flags = args.flags;
  306                         nd->root_args.sotype = args.sotype;
  307                         nd->root_args.rsize = args.rsize;
  308                         nd->root_args.wsize = args.wsize;
  309                         freeenv(cp);
  310                 }
  311         
  312                 nfs_diskless_valid = 1;
  313         }
  314 }
  315 
  316 static int
  317 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
  318 {
  319         u_int32_t a[4];
  320         char *cp;
  321         int count;
  322 
  323         bzero(sa, sizeof(*sa));
  324         sa->sin_len = sizeof(*sa);
  325         sa->sin_family = AF_INET;
  326 
  327         if ((cp = getenv(ev)) == NULL)
  328                 return (1);
  329         count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
  330         freeenv(cp);
  331         if (count != 4)
  332                 return (1);
  333         sa->sin_addr.s_addr =
  334             htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
  335         return (0);
  336 }
  337 
  338 static int
  339 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
  340 {
  341         char *cp;
  342         u_int32_t a[6];
  343         int count;
  344 
  345         bzero(sa, sizeof(*sa));
  346         sa->sdl_len = sizeof(*sa);
  347         sa->sdl_family = AF_LINK;
  348         sa->sdl_type = IFT_ETHER;
  349         sa->sdl_alen = ETHER_ADDR_LEN;
  350         if ((cp = getenv(ev)) == NULL)
  351                 return (1);
  352         count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
  353             &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
  354         freeenv(cp);
  355         if (count != 6)
  356                 return (1);
  357         sa->sdl_data[0] = a[0];
  358         sa->sdl_data[1] = a[1];
  359         sa->sdl_data[2] = a[2];
  360         sa->sdl_data[3] = a[3];
  361         sa->sdl_data[4] = a[4];
  362         sa->sdl_data[5] = a[5];
  363         return (0);
  364 }
  365 
  366 static int
  367 decode_nfshandle(char *ev, u_char *fh, int maxfh) 
  368 {
  369         u_char *cp, *ep;
  370         int len, val;
  371 
  372         ep = cp = getenv(ev);
  373         if (cp == NULL)
  374                 return (0);
  375         if ((strlen(cp) < 2) || (*cp != 'X')) {
  376                 freeenv(ep);
  377                 return (0);
  378         }
  379         len = 0;
  380         cp++;
  381         for (;;) {
  382                 if (*cp == 'X') {
  383                         freeenv(ep);
  384                         return (len);
  385                 }
  386                 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
  387                         freeenv(ep);
  388                         return (0);
  389                 }
  390                 *(fh++) = val;
  391                 len++;
  392                 cp += 2;
  393                 if (len > maxfh) {
  394                     freeenv(ep);
  395                     return (0);
  396                 }
  397         }
  398 }
  399 
  400 #if !defined(BOOTP_NFSROOT)
  401 static void
  402 nfs_rootconf(void)
  403 {
  404 
  405         nfs_setup_diskless();
  406         if (nfs_diskless_valid)
  407                 rootdevnames[0] = "nfs:";
  408 }
  409 
  410 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
  411 #endif
  412 

Cache object: 57444a0d83c9f94fa4292f76e442509c


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.