1 /* 2 * Copyright (c) 1995 Gordon Ross, Adam Glass 3 * Copyright (c) 1992 Regents of the University of California. 4 * All rights reserved. 5 * 6 * This software was developed by the Computer Systems Engineering group 7 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 8 * contributed to Berkeley. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Lawrence Berkeley Laboratory and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * nfs/krpc_subr.c 39 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $ 40 * $FreeBSD: src/sys/nfs/bootp_subr.c,v 1.20.2.9 2003/04/24 16:51:08 ambrisko Exp $ 41 * $DragonFly: src/sys/vfs/nfs/nfs_mountrpc.c,v 1.2 2006/12/23 00:41:29 swildner Exp $ 42 */ 43 /* 44 * Procedures used by NFS_ROOT and BOOTP to do an NFS mount rpc to obtain 45 * the nfs root file handle for a NFS-based root mount point. This module 46 * is not used by normal operating code because the 'mount' command has a 47 * far more sophisticated implementation. 48 */ 49 #include "opt_bootp.h" 50 #include "opt_nfsroot.h" 51 52 #if defined(BOOTP) || defined(NFS_ROOT) 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/kernel.h> 57 #include <sys/sockio.h> 58 #include <sys/proc.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/mbuf.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/sysctl.h> 65 #include <sys/uio.h> 66 67 #include <net/if.h> 68 #include <net/route.h> 69 70 #include <netinet/in.h> 71 #include <net/if_types.h> 72 #include <net/if_dl.h> 73 74 #include "rpcv2.h" 75 #include "nfsproto.h" 76 #include "nfs.h" 77 #include "nfsdiskless.h" 78 #include "krpc.h" 79 #include "xdr_subs.h" 80 #include "nfsmountrpc.h" 81 82 /* 83 * What is the longest we will wait before re-sending a request? 84 * Note this is also the frequency of "RPC timeout" messages. 85 * The re-send loop count sup linearly to this maximum, so the 86 * first complaint will happen after (1+2+3+4+5)=15 seconds. 87 */ 88 89 static int getdec(char **ptr); 90 static char *substr(char *a,char *b); 91 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 92 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 93 94 void 95 mountopts(struct nfs_args *args, char *p) 96 { 97 char *tmp; 98 99 args->version = NFS_ARGSVERSION; 100 args->rsize = 8192; 101 args->wsize = 8192; 102 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 103 args->sotype = SOCK_DGRAM; 104 if (p == NULL) 105 return; 106 if ((tmp = (char *)substr(p, "rsize="))) 107 args->rsize = getdec(&tmp); 108 if ((tmp = (char *)substr(p, "wsize="))) 109 args->wsize = getdec(&tmp); 110 if ((tmp = (char *)substr(p, "intr"))) 111 args->flags |= NFSMNT_INT; 112 if ((tmp = (char *)substr(p, "soft"))) 113 args->flags |= NFSMNT_SOFT; 114 if ((tmp = (char *)substr(p, "noconn"))) 115 args->flags |= NFSMNT_NOCONN; 116 if ((tmp = (char *)substr(p, "tcp"))) 117 args->sotype = SOCK_STREAM; 118 } 119 120 /* 121 * RPC: mountd/mount 122 * Given a server pathname, get an NFS file handle. 123 * Also, sets sin->sin_port to the NFS service port. 124 */ 125 int 126 md_mount(struct sockaddr_in *mdsin, /* mountd server address */ 127 char *path, 128 u_char *fhp, 129 int *fhsizep, 130 struct nfs_args *args, 131 struct thread *td) 132 { 133 struct mbuf *m; 134 int error; 135 int authunixok; 136 int authcount; 137 int authver; 138 139 #ifdef BOOTP_NFSV3 140 /* First try NFS v3 */ 141 /* Get port number for MOUNTD. */ 142 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 143 &mdsin->sin_port, td); 144 if (error == 0) { 145 m = xdr_string_encode(path, strlen(path)); 146 147 /* Do RPC to mountd. */ 148 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 149 RPCMNT_MOUNT, &m, NULL, td); 150 } 151 if (error == 0) { 152 args->flags |= NFSMNT_NFSV3; 153 } else { 154 #endif 155 /* Fallback to NFS v2 */ 156 157 /* Get port number for MOUNTD. */ 158 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 159 &mdsin->sin_port, td); 160 if (error != 0) 161 return error; 162 163 m = xdr_string_encode(path, strlen(path)); 164 165 /* Do RPC to mountd. */ 166 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 167 RPCMNT_MOUNT, &m, NULL, td); 168 if (error != 0) 169 return error; /* message already freed */ 170 171 #ifdef BOOTP_NFSV3 172 } 173 #endif 174 175 if (xdr_int_decode(&m, &error) != 0 || error != 0) 176 goto bad; 177 178 if ((args->flags & NFSMNT_NFSV3) != 0) { 179 if (xdr_int_decode(&m, fhsizep) != 0 || 180 *fhsizep > NFSX_V3FHMAX || 181 *fhsizep <= 0) 182 goto bad; 183 } else 184 *fhsizep = NFSX_V2FH; 185 186 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 187 goto bad; 188 189 if (args->flags & NFSMNT_NFSV3) { 190 if (xdr_int_decode(&m, &authcount) != 0) 191 goto bad; 192 authunixok = 0; 193 if (authcount < 0 || authcount > 100) 194 goto bad; 195 while (authcount > 0) { 196 if (xdr_int_decode(&m, &authver) != 0) 197 goto bad; 198 if (authver == RPCAUTH_UNIX) 199 authunixok = 1; 200 authcount--; 201 } 202 if (authunixok == 0) 203 goto bad; 204 } 205 206 /* Set port number for NFS use. */ 207 error = krpc_portmap(mdsin, NFS_PROG, 208 (args->flags & 209 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 210 &mdsin->sin_port, td); 211 212 goto out; 213 214 bad: 215 error = EBADRPC; 216 217 out: 218 m_freem(m); 219 return error; 220 } 221 222 int 223 md_lookup_swap(struct sockaddr_in *mdsin, /* mountd server address */ 224 char *path, 225 u_char *fhp, 226 int *fhsizep, 227 struct nfs_args *args, 228 struct thread *td) 229 { 230 struct mbuf *m; 231 int error; 232 int size = -1; 233 int attribs_present; 234 int status; 235 union { 236 u_int32_t v2[17]; 237 u_int32_t v3[21]; 238 } fattribs; 239 240 m = m_get(MB_WAIT,MT_DATA); 241 if (m == NULL) 242 return ENOBUFS; 243 244 if ((args->flags & NFSMNT_NFSV3) != 0) { 245 *mtod(m, u_int32_t *) = txdr_unsigned(*fhsizep); 246 bcopy(fhp, mtod(m, u_char *) + sizeof(u_int32_t), *fhsizep); 247 m->m_len = *fhsizep + sizeof(u_int32_t); 248 } else { 249 bcopy(fhp, mtod(m, u_char *), NFSX_V2FH); 250 m->m_len = NFSX_V2FH; 251 } 252 253 m->m_next = xdr_string_encode(path, strlen(path)); 254 if (m->m_next == NULL) { 255 error = ENOBUFS; 256 goto out; 257 } 258 259 /* Do RPC to nfsd. */ 260 if ((args->flags & NFSMNT_NFSV3) != 0) 261 error = krpc_call(mdsin, NFS_PROG, NFS_VER3, 262 NFSPROC_LOOKUP, &m, NULL, td); 263 else 264 error = krpc_call(mdsin, NFS_PROG, NFS_VER2, 265 NFSV2PROC_LOOKUP, &m, NULL, td); 266 if (error != 0) 267 return error; /* message already freed */ 268 269 if (xdr_int_decode(&m, &status) != 0) 270 goto bad; 271 if (status != 0) { 272 error = ENOENT; 273 goto out; 274 } 275 276 if ((args->flags & NFSMNT_NFSV3) != 0) { 277 if (xdr_int_decode(&m, fhsizep) != 0 || 278 *fhsizep > NFSX_V3FHMAX || 279 *fhsizep <= 0) 280 goto bad; 281 } else 282 *fhsizep = NFSX_V2FH; 283 284 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 285 goto bad; 286 287 if ((args->flags & NFSMNT_NFSV3) != 0) { 288 if (xdr_int_decode(&m, &attribs_present) != 0) 289 goto bad; 290 if (attribs_present != 0) { 291 if (xdr_opaque_decode(&m, (u_char *) &fattribs.v3, 292 sizeof(u_int32_t) * 21) != 0) 293 goto bad; 294 size = fxdr_unsigned(u_int32_t, fattribs.v3[6]); 295 } 296 } else { 297 if (xdr_opaque_decode(&m,(u_char *) &fattribs.v2, 298 sizeof(u_int32_t) * 17) != 0) 299 goto bad; 300 size = fxdr_unsigned(u_int32_t, fattribs.v2[5]); 301 } 302 303 if (nfsv3_diskless.swap_nblks == 0 && size != -1) { 304 nfsv3_diskless.swap_nblks = size / 1024; 305 kprintf("md_lookup_swap: Swap size is %d KB\n", 306 nfsv3_diskless.swap_nblks); 307 } 308 309 goto out; 310 311 bad: 312 error = EBADRPC; 313 314 out: 315 m_freem(m); 316 return error; 317 } 318 319 int 320 setfs(struct sockaddr_in *addr, char *path, char *p) 321 { 322 unsigned int ip; 323 int val; 324 325 ip = 0; 326 if (((val = getdec(&p)) < 0) || (val > 255)) 327 return 0; 328 ip = val << 24; 329 if (*p != '.') 330 return 0; 331 p++; 332 if (((val = getdec(&p)) < 0) || (val > 255)) 333 return 0; 334 ip |= (val << 16); 335 if (*p != '.') 336 return 0; 337 p++; 338 if (((val = getdec(&p)) < 0) || (val > 255)) 339 return 0; 340 ip |= (val << 8); 341 if (*p != '.') 342 return 0; 343 p++; 344 if (((val = getdec(&p)) < 0) || (val > 255)) 345 return 0; 346 ip |= val; 347 if (*p != ':') 348 return 0; 349 p++; 350 351 addr->sin_addr.s_addr = htonl(ip); 352 addr->sin_len = sizeof(struct sockaddr_in); 353 addr->sin_family = AF_INET; 354 355 strncpy(path, p, MNAMELEN - 1); 356 return 1; 357 } 358 359 static int 360 getdec(char **ptr) 361 { 362 char *p; 363 int ret; 364 365 p = *ptr; 366 ret = 0; 367 if ((*p < '0') || (*p > '9')) 368 return -1; 369 while ((*p >= '0') && (*p <= '9')) { 370 ret = ret * 10 + (*p - '0'); 371 p++; 372 } 373 *ptr = p; 374 return ret; 375 } 376 377 static char * 378 substr(char *a, char *b) 379 { 380 char *loc1; 381 char *loc2; 382 383 while (*a != '\0') { 384 loc1 = a; 385 loc2 = b; 386 while (*loc1 == *loc2++) { 387 if (*loc1 == '\0') 388 return 0; 389 loc1++; 390 if (*loc2 == '\0') 391 return loc1; 392 } 393 a++; 394 } 395 return 0; 396 } 397 398 static int 399 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 400 { 401 struct mbuf *m; 402 int alignedlen; 403 404 m = *mptr; 405 alignedlen = ( len + 3 ) & ~3; 406 407 if (m->m_len < alignedlen) { 408 m = m_pullup(m, alignedlen); 409 if (m == NULL) { 410 *mptr = NULL; 411 return EBADRPC; 412 } 413 } 414 bcopy(mtod(m, u_char *), buf, len); 415 m_adj(m, alignedlen); 416 *mptr = m; 417 return 0; 418 } 419 420 static int 421 xdr_int_decode(struct mbuf **mptr, int *iptr) 422 { 423 u_int32_t i; 424 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 425 return EBADRPC; 426 *iptr = fxdr_unsigned(u_int32_t, i); 427 return 0; 428 } 429 430 #endif /* BOOTP && NFS_ROOT */ 431 432