The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/nfs/krpc_subr.c

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    1 /*      $NetBSD: krpc_subr.c,v 1.37 2009/03/15 17:20:09 cegger Exp $    */
    2 
    3 /*
    4  * Copyright (c) 1995 Gordon Ross, Adam Glass
    5  * Copyright (c) 1992 Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * This software was developed by the Computer Systems Engineering group
    9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   10  * contributed to Berkeley.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by the University of
   23  *      California, Lawrence Berkeley Laboratory and its contributors.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  * partially based on:
   41  *      libnetboot/rpc.c
   42  *               @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp  (LBL)
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __KERNEL_RCSID(0, "$NetBSD: krpc_subr.c,v 1.37 2009/03/15 17:20:09 cegger Exp $");
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/ioctl.h>
   51 #include <sys/proc.h>
   52 #include <sys/mount.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/reboot.h>
   55 #include <sys/socket.h>
   56 #include <sys/socketvar.h>
   57 
   58 #include <netinet/in.h>
   59 
   60 #include <nfs/rpcv2.h>
   61 #include <nfs/krpc.h>
   62 #include <nfs/xdr_subs.h>
   63 #include <nfs/nfsproto.h> /* XXX NFSX_V3FHMAX for next */
   64 #include <nfs/nfs.h>
   65 #include <nfs/nfsmount.h>
   66 #include <nfs/nfsdiskless.h> /* XXX decl nfs_boot_sendrecv */
   67 
   68 /*
   69  * Kernel support for Sun RPC
   70  *
   71  * Used currently for bootstrapping in nfs diskless configurations.
   72  */
   73 
   74 /*
   75  * Generic RPC headers
   76  */
   77 
   78 struct auth_info {
   79         u_int32_t       authtype;       /* auth type */
   80         u_int32_t       authlen;        /* auth length */
   81 };
   82 
   83 struct auth_unix {
   84         int32_t   ua_time;
   85         int32_t   ua_hostname;  /* null */
   86         int32_t   ua_uid;
   87         int32_t   ua_gid;
   88         int32_t   ua_gidlist;   /* null */
   89 };
   90 
   91 struct rpc_call {
   92         u_int32_t       rp_xid;         /* request transaction id */
   93         int32_t         rp_direction;   /* call direction (0) */
   94         u_int32_t       rp_rpcvers;     /* rpc version (2) */
   95         u_int32_t       rp_prog;        /* program */
   96         u_int32_t       rp_vers;        /* version */
   97         u_int32_t       rp_proc;        /* procedure */
   98         struct  auth_info rpc_auth;
   99         struct  auth_unix rpc_unix;
  100         struct  auth_info rpc_verf;
  101 };
  102 
  103 struct rpc_reply {
  104         u_int32_t rp_xid;               /* request transaction id */
  105         int32_t  rp_direction;          /* call direction (1) */
  106         int32_t  rp_astatus;            /* accept status (0: accepted) */
  107         union {
  108                 /* rejected */
  109                 struct {
  110                         u_int32_t rej_stat;
  111                         u_int32_t rej_val1;
  112                         u_int32_t rej_val2;
  113                 } rpu_rej;
  114                 /* accepted */
  115                 struct {
  116                         struct auth_info rok_auth;
  117                         u_int32_t       rok_status;
  118                 } rpu_rok;
  119         } rp_u;
  120 };
  121 #define rp_rstat  rp_u.rpu_rej.rej_stat
  122 #define rp_auth   rp_u.rpu_rok.rok_auth
  123 #define rp_status rp_u.rpu_rok.rok_status
  124 
  125 #define MIN_REPLY_HDR 16        /* xid, dir, astat, errno */
  126 
  127 static int krpccheck(struct mbuf*, void*);
  128 
  129 /*
  130  * Call portmap to lookup a port number for a particular rpc program
  131  * Returns non-zero error on failure.
  132  */
  133 int
  134 krpc_portmap(struct sockaddr_in *sin, u_int prog, u_int vers, u_int proto, u_int16_t *portp, struct lwp *l)
  135         /* sin:          server address */
  136         /* prog, vers, proto:    host order */
  137         /* portp:        network order */
  138 {
  139         struct sdata {
  140                 u_int32_t prog;         /* call program */
  141                 u_int32_t vers;         /* call version */
  142                 u_int32_t proto;        /* call protocol */
  143                 u_int32_t port;         /* call port (unused) */
  144         } *sdata;
  145         struct rdata {
  146                 u_int16_t pad;
  147                 u_int16_t port;
  148         } *rdata;
  149         struct mbuf *m;
  150         int error;
  151 
  152         /* The portmapper port is fixed. */
  153         if (prog == PMAPPROG) {
  154                 *portp = htons(PMAPPORT);
  155                 return 0;
  156         }
  157 
  158         m = m_get(M_WAIT, MT_DATA);
  159         sdata = mtod(m, struct sdata *);
  160         m->m_len = sizeof(*sdata);
  161 
  162         /* Do the RPC to get it. */
  163         sdata->prog = txdr_unsigned(prog);
  164         sdata->vers = txdr_unsigned(vers);
  165         sdata->proto = txdr_unsigned(proto);
  166         sdata->port = 0;
  167 
  168         sin->sin_port = htons(PMAPPORT);
  169         error = krpc_call(sin, PMAPPROG, PMAPVERS,
  170                                           PMAPPROC_GETPORT, &m, NULL, l);
  171         if (error)
  172                 return error;
  173 
  174         if (m->m_len < sizeof(*rdata)) {
  175                 m = m_pullup(m, sizeof(*rdata));
  176                 if (m == NULL)
  177                         return ENOBUFS;
  178         }
  179         rdata = mtod(m, struct rdata *);
  180         *portp = rdata->port;
  181 
  182         m_freem(m);
  183         return 0;
  184 }
  185 
  186 static int krpccheck(struct mbuf *m, void *context)
  187 {
  188         struct rpc_reply *reply;
  189 
  190         /* Does the reply contain at least a header? */
  191         if (m->m_pkthdr.len < MIN_REPLY_HDR)
  192                 return(-1);
  193         if (m->m_len < sizeof(struct rpc_reply)) {
  194                 m = m_pullup(m, sizeof(struct rpc_reply));
  195                 if (m == NULL)
  196                         return(-1);
  197         }
  198         reply = mtod(m, struct rpc_reply *);
  199 
  200         /* Is it the right reply? */
  201         if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
  202                 return(-1);
  203 
  204         if (reply->rp_xid != txdr_unsigned(*(u_int32_t*)context))
  205                 return(-1);
  206 
  207         return(0);
  208 }
  209 
  210 /*
  211  * Do a remote procedure call (RPC) and wait for its reply.
  212  * If from_p is non-null, then we are doing broadcast, and
  213  * the address from whence the response came is saved there.
  214  */
  215 int
  216 krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func, struct mbuf **data, struct mbuf **from_p, struct lwp *l)
  217         /* data:         input/output */
  218         /* from_p:       output */
  219 {
  220         struct socket *so;
  221         struct sockaddr_in *sin;
  222         struct mbuf *m, *nam, *mhead, *from;
  223         struct rpc_call *call;
  224         struct rpc_reply *reply;
  225         int error, len;
  226         static u_int32_t xid = ~0xFF;
  227         u_int16_t tport;
  228 
  229         /*
  230          * Validate address family.
  231          * Sorry, this is INET specific...
  232          */
  233         if (sa->sin_family != AF_INET)
  234                 return (EAFNOSUPPORT);
  235 
  236         /* Free at end if not null. */
  237         nam = mhead = NULL;
  238         from = NULL;
  239 
  240         /*
  241          * Create socket and set its receive timeout.
  242          */
  243         if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, l, NULL)))
  244                 goto out;
  245 
  246         if ((error = nfs_boot_setrecvtimo(so)))
  247                 goto out;
  248 
  249         /*
  250          * Enable broadcast if necessary.
  251          */
  252         if (from_p) {
  253                 if ((error = nfs_boot_enbroadcast(so)))
  254                         goto out;
  255         }
  256 
  257         /*
  258          * Bind the local endpoint to a reserved port,
  259          * because some NFS servers refuse requests from
  260          * non-reserved (non-privileged) ports.
  261          */
  262         tport = IPPORT_RESERVED;
  263         do {
  264                 tport--;
  265                 error = nfs_boot_sobind_ipport(so, tport, l);
  266         } while (error == EADDRINUSE &&
  267                          tport > IPPORT_RESERVED / 2);
  268         if (error) {
  269                 printf("bind failed\n");
  270                 goto out;
  271         }
  272 
  273         /*
  274          * Setup socket address for the server.
  275          */
  276         nam = m_get(M_WAIT, MT_SONAME);
  277         sin = mtod(nam, struct sockaddr_in *);
  278         memcpy((void *)sin, (void *)sa,
  279                   (nam->m_len = sa->sin_len));
  280 
  281         /*
  282          * Prepend RPC message header.
  283          */
  284         mhead = m_gethdr(M_WAIT, MT_DATA);
  285         mhead->m_next = *data;
  286         call = mtod(mhead, struct rpc_call *);
  287         mhead->m_len = sizeof(*call);
  288         memset((void *)call, 0, sizeof(*call));
  289         /* rpc_call part */
  290         xid++;
  291         call->rp_xid = txdr_unsigned(xid);
  292         /* call->rp_direction = 0; */
  293         call->rp_rpcvers = txdr_unsigned(2);
  294         call->rp_prog = txdr_unsigned(prog);
  295         call->rp_vers = txdr_unsigned(vers);
  296         call->rp_proc = txdr_unsigned(func);
  297         /* rpc_auth part (auth_unix as root) */
  298         call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
  299         call->rpc_auth.authlen  = txdr_unsigned(sizeof(struct auth_unix));
  300         /* rpc_verf part (auth_null) */
  301         call->rpc_verf.authtype = 0;
  302         call->rpc_verf.authlen  = 0;
  303 
  304         /*
  305          * Setup packet header
  306          */
  307         len = 0;
  308         m = mhead;
  309         while (m) {
  310                 len += m->m_len;
  311                 m = m->m_next;
  312         }
  313         mhead->m_pkthdr.len = len;
  314         mhead->m_pkthdr.rcvif = NULL;
  315 
  316         error = nfs_boot_sendrecv(so, nam, 0, mhead, krpccheck, &m, &from,
  317             &xid, l);
  318         if (error)
  319                 goto out;
  320 
  321         /* m_pullup() was done in krpccheck() */
  322         reply = mtod(m, struct rpc_reply *);
  323 
  324         /* Was RPC accepted? (authorization OK) */
  325         if (reply->rp_astatus != 0) {
  326                 /* Note: This is NOT an error code! */
  327                 error = fxdr_unsigned(u_int32_t, reply->rp_rstat);
  328                 switch (error) {
  329                     case RPC_MISMATCH:
  330                         /* .re_status = RPC_VERSMISMATCH; */
  331                         error = ERPCMISMATCH;
  332                         break;
  333                     case RPC_AUTHERR:
  334                         /* .re_status = RPC_AUTHERROR; */
  335                         error = EAUTH;
  336                         break;
  337                     default:
  338                         /* unexpected */
  339                         error = EBADRPC;
  340                         break;
  341                 }
  342                 goto out;
  343         }
  344 
  345         /* Did the call succeed? */
  346         if (reply->rp_status != 0) {
  347                 /* Note: This is NOT an error code! */
  348                 error = fxdr_unsigned(u_int32_t, reply->rp_status);
  349                 switch (error) {
  350                     case RPC_PROGUNAVAIL:
  351                         error = EPROGUNAVAIL;
  352                         break;
  353                     case RPC_PROGMISMATCH:
  354                         error = EPROGMISMATCH;
  355                         break;
  356                     case RPC_PROCUNAVAIL:
  357                         error = EPROCUNAVAIL;
  358                         break;
  359                     case RPC_GARBAGE:
  360                     default:
  361                         error = EBADRPC;
  362                 }
  363                 goto out;
  364         }
  365 
  366         /*
  367          * OK, we have received a good reply!
  368          * Get its length, then strip it off.
  369          */
  370         len = sizeof(*reply);
  371         if (reply->rp_auth.authtype != 0) {
  372                 len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
  373                 len = (len + 3) & ~3; /* XXX? */
  374         }
  375         m_adj(m, len);
  376 
  377         /* result */
  378         *data = m;
  379         if (from_p && error == 0) {
  380                 *from_p = from;
  381                 from = NULL;
  382         }
  383 
  384  out:
  385         if (nam) m_freem(nam);
  386         if (mhead) m_freem(mhead);
  387         if (from) m_freem(from);
  388         soclose(so);
  389         return error;
  390 }
  391 
  392 /*
  393  * eXternal Data Representation routines.
  394  * (but with non-standard args...)
  395  */
  396 
  397 /*
  398  * String representation for RPC.
  399  */
  400 struct xdr_string {
  401         u_int32_t len;          /* length without null or padding */
  402         char data[4];   /* data (longer, of course) */
  403     /* data is padded to a long-word boundary */
  404 };
  405 
  406 struct mbuf *
  407 xdr_string_encode(char *str, int len)
  408 {
  409         struct mbuf *m;
  410         struct xdr_string *xs;
  411         int dlen;       /* padded string length */
  412         int mlen;       /* message length */
  413 
  414         dlen = (len + 3) & ~3;
  415         mlen = dlen + 4;
  416 
  417         if (mlen > MCLBYTES)            /* If too big, we just can't do it. */
  418                 return (NULL);
  419 
  420         m = m_get(M_WAIT, MT_DATA);
  421         if (mlen > MLEN) {
  422                 m_clget(m, M_WAIT);
  423                 if ((m->m_flags & M_EXT) == 0) {
  424                         (void) m_free(m);       /* There can be only one. */
  425                         return (NULL);
  426                 }
  427         }
  428         xs = mtod(m, struct xdr_string *);
  429         m->m_len = mlen;
  430         xs->len = txdr_unsigned(len);
  431         memcpy(xs->data, str, len);
  432         return (m);
  433 }
  434 
  435 struct mbuf *
  436 xdr_string_decode(struct mbuf *m, char *str, int *len_p)
  437         /* len_p:                bufsize - 1 */
  438 {
  439         struct xdr_string *xs;
  440         int mlen;       /* message length */
  441         int slen;       /* string length */
  442 
  443         if (m->m_len < 4) {
  444                 m = m_pullup(m, 4);
  445                 if (m == NULL)
  446                         return (NULL);
  447         }
  448         xs = mtod(m, struct xdr_string *);
  449         slen = fxdr_unsigned(u_int32_t, xs->len);
  450         mlen = 4 + ((slen + 3) & ~3);
  451 
  452         if (slen > *len_p)
  453                 slen = *len_p;
  454         m_copydata(m, 4, slen, str);
  455         m_adj(m, mlen);
  456 
  457         str[slen] = '\0';
  458         *len_p = slen;
  459 
  460         return (m);
  461 }
  462 
  463 
  464 /*
  465  * Inet address in RPC messages
  466  * (Note, really four ints, NOT chars.  Blech.)
  467  */
  468 struct xdr_inaddr {
  469         u_int32_t atype;
  470         u_int32_t addr[4];
  471 };
  472 
  473 struct mbuf *
  474 xdr_inaddr_encode(struct in_addr *ia)
  475         /* ia:           already in network order */
  476 {
  477         struct mbuf *m;
  478         struct xdr_inaddr *xi;
  479         u_int8_t *cp;
  480         u_int32_t *ip;
  481 
  482         m = m_get(M_WAIT, MT_DATA);
  483         xi = mtod(m, struct xdr_inaddr *);
  484         m->m_len = sizeof(*xi);
  485         xi->atype = txdr_unsigned(1);
  486         ip = xi->addr;
  487         cp = (u_int8_t *)&ia->s_addr;
  488         *ip++ = txdr_unsigned(*cp++);
  489         *ip++ = txdr_unsigned(*cp++);
  490         *ip++ = txdr_unsigned(*cp++);
  491         *ip++ = txdr_unsigned(*cp++);
  492 
  493         return (m);
  494 }
  495 
  496 struct mbuf *
  497 xdr_inaddr_decode(struct mbuf *m, struct in_addr *ia)
  498         /* ia:           already in network order */
  499 {
  500         struct xdr_inaddr *xi;
  501         u_int8_t *cp;
  502         u_int32_t *ip;
  503 
  504         if (m->m_len < sizeof(*xi)) {
  505                 m = m_pullup(m, sizeof(*xi));
  506                 if (m == NULL)
  507                         return (NULL);
  508         }
  509         xi = mtod(m, struct xdr_inaddr *);
  510         if (xi->atype != txdr_unsigned(1)) {
  511                 ia->s_addr = INADDR_ANY;
  512                 goto out;
  513         }
  514         ip = xi->addr;
  515         cp = (u_int8_t *)&ia->s_addr;
  516         *cp++ = fxdr_unsigned(u_int8_t, *ip++);
  517         *cp++ = fxdr_unsigned(u_int8_t, *ip++);
  518         *cp++ = fxdr_unsigned(u_int8_t, *ip++);
  519         *cp++ = fxdr_unsigned(u_int8_t, *ip++);
  520 
  521 out:
  522         m_adj(m, sizeof(*xi));
  523         return (m);
  524 }

Cache object: a805af304c5a44614900e9932366e351


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