1 /* $NetBSD: nfs_diskless.c,v 1.2 2016/12/13 22:41:46 pgoyette Exp $ */ 2 /*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91 34 */ 35 36 #include <sys/cdefs.h> 37 /* __FBSDID("FreeBSD: head/sys/nfs/nfs_diskless.c 297086 2016-03-20 21:48:26Z ian "); */ 38 __RCSID("$NetBSD: nfs_diskless.c,v 1.2 2016/12/13 22:41:46 pgoyette Exp $"); 39 40 #ifdef _KERNEL_OPT 41 #include "opt_newnfs.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/socket.h> 51 52 #include <net/if.h> 53 #include <net/if_dl.h> 54 #include <net/if_types.h> 55 56 #include <net/if_var.h> 57 #include <net/ethernet.h> 58 #include <net/vnet.h> 59 60 #include <netinet/in.h> 61 62 #include <fs/nfs/common/nfsproto.h> 63 #include <fs/nfs/client/nfs.h> 64 #include <fs/nfs/common/nfsdiskless.h> 65 66 #define NFS_IFACE_TIMEOUT_SECS 10 /* Timeout for interface to appear. */ 67 68 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa); 69 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa); 70 static int decode_nfshandle(char *ev, u_char *fh, int maxfh); 71 72 /* 73 * This structure must be filled in by a primary bootstrap or bootstrap 74 * server for a diskless/dataless machine. It is initialized below just 75 * to ensure that it is allocated to initialized data (.data not .bss). 76 */ 77 struct nfs_diskless nfs_diskless = { { { 0 } } }; 78 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 79 int nfs_diskless_valid = 0; 80 81 /* 82 * Validate/sanity check a rsize/wsize parameter. 83 */ 84 static int 85 checkrwsize(unsigned long v, const char *name) 86 { 87 /* 88 * 32K is used as an upper bound because most servers 89 * limit block size to satisfy IPv4's limit of 90 * 64K/reassembled packet. The lower bound is pretty 91 * much arbitrary. 92 */ 93 if (!(4 <= v && v <= 32*1024)) { 94 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v); 95 return 0; 96 } else 97 return 1; 98 } 99 100 /* 101 * Parse mount options and apply them to the supplied 102 * nfs_diskless state. Used also by bootp/dhcp support. 103 */ 104 void 105 nfs_parse_options(const char *envopts, struct nfs_args *nd) 106 { 107 char *opts, *o, *otmp; 108 unsigned long v; 109 110 opts = strdup(envopts, M_TEMP); 111 otmp = opts; 112 while ((o = strsep(&otmp, ":;, ")) != NULL) { 113 if (*o == '\0') 114 ; /* Skip empty options. */ 115 else if (strcmp(o, "soft") == 0) 116 nd->flags |= NFSMNT_SOFT; 117 else if (strcmp(o, "intr") == 0) 118 nd->flags |= NFSMNT_INT; 119 else if (strcmp(o, "conn") == 0) 120 nd->flags |= NFSMNT_NOCONN; 121 else if (strcmp(o, "nolockd") == 0) 122 nd->flags |= NFSMNT_NOLOCKD; 123 else if (strcmp(o, "nocto") == 0) 124 nd->flags |= NFSMNT_NOCTO; 125 else if (strcmp(o, "nfsv2") == 0) 126 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4); 127 else if (strcmp(o, "nfsv3") == 0) { 128 nd->flags &= ~NFSMNT_NFSV4; 129 nd->flags |= NFSMNT_NFSV3; 130 } else if (strcmp(o, "tcp") == 0) 131 nd->sotype = SOCK_STREAM; 132 else if (strcmp(o, "udp") == 0) 133 nd->sotype = SOCK_DGRAM; 134 else if (strncmp(o, "rsize=", 6) == 0) { 135 v = strtoul(o+6, NULL, 10); 136 if (checkrwsize(v, "rsize")) { 137 nd->rsize = (int) v; 138 nd->flags |= NFSMNT_RSIZE; 139 } 140 } else if (strncmp(o, "wsize=", 6) == 0) { 141 v = strtoul(o+6, NULL, 10); 142 if (checkrwsize(v, "wsize")) { 143 nd->wsize = (int) v; 144 nd->flags |= NFSMNT_WSIZE; 145 } 146 } else 147 printf("%s: skipping unknown option \"%s\"\n", 148 __func__, o); 149 } 150 free(opts, M_TEMP); 151 } 152 153 /* 154 * Populate the essential fields in the nfsv3_diskless structure. 155 * 156 * The loader is expected to export the following environment variables: 157 * 158 * boot.netif.name name of boot interface 159 * boot.netif.ip IP address on boot interface 160 * boot.netif.netmask netmask on boot interface 161 * boot.netif.gateway default gateway (optional) 162 * boot.netif.hwaddr hardware address of boot interface 163 * boot.netif.mtu interface mtu from bootp/dhcp (optional) 164 * boot.nfsroot.server IP address of root filesystem server 165 * boot.nfsroot.path path of the root filesystem on server 166 * boot.nfsroot.nfshandle NFS handle for root filesystem on server 167 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only) 168 * boot.nfsroot.options NFS options for the root filesystem 169 */ 170 void 171 nfs_setup_diskless(void) 172 { 173 struct nfs_diskless *nd = &nfs_diskless; 174 struct nfsv3_diskless *nd3 = &nfsv3_diskless; 175 struct ifnet *ifp; 176 struct ifaddr *ifa; 177 struct sockaddr_dl *sdl, ourdl; 178 struct sockaddr_in myaddr, netmask; 179 char *cp; 180 int cnt, fhlen, is_nfsv3; 181 uint32_t len; 182 time_t timeout_at; 183 184 if (nfs_diskless_valid != 0) 185 return; 186 187 /* get handle size. If this succeeds, it's an NFSv3 setup. */ 188 if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) { 189 cnt = sscanf(cp, "%d", &len); 190 freeenv(cp); 191 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) { 192 printf("nfs_diskless: bad NFS handle len\n"); 193 return; 194 } 195 nd3->root_fhsize = len; 196 is_nfsv3 = 1; 197 } else 198 is_nfsv3 = 0; 199 /* set up interface */ 200 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) 201 return; 202 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { 203 printf("nfs_diskless: no netmask\n"); 204 return; 205 } 206 if (is_nfsv3 != 0) { 207 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr)); 208 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr)); 209 ((struct sockaddr_in *) 210 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr = 211 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 212 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask)); 213 } else { 214 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); 215 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); 216 ((struct sockaddr_in *) 217 &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 218 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 219 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); 220 } 221 222 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { 223 printf("nfs_diskless: no hardware address\n"); 224 return; 225 } 226 ifa = NULL; 227 timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS; 228 retry: 229 CURVNET_SET(TD_TO_VNET(curthread)); 230 IFNET_RLOCK(); 231 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 232 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 233 if (ifa->ifa_addr->sa_family == AF_LINK) { 234 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 235 if ((sdl->sdl_type == ourdl.sdl_type) && 236 (sdl->sdl_alen == ourdl.sdl_alen) && 237 !bcmp(LLADDR(sdl), 238 LLADDR(&ourdl), 239 sdl->sdl_alen)) { 240 IFNET_RUNLOCK(); 241 CURVNET_RESTORE(); 242 goto match_done; 243 } 244 } 245 } 246 } 247 IFNET_RUNLOCK(); 248 CURVNET_RESTORE(); 249 if (time_uptime < timeout_at) { 250 pause("nfssdl", hz / 5); 251 goto retry; 252 } 253 printf("nfs_diskless: no interface\n"); 254 return; /* no matching interface */ 255 match_done: 256 kern_setenv("boot.netif.name", ifp->if_xname); 257 if (is_nfsv3 != 0) { 258 strlcpy(nd3->myif.ifra_name, ifp->if_xname, 259 sizeof(nd3->myif.ifra_name)); 260 261 /* set up gateway */ 262 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway); 263 264 /* set up root mount */ 265 nd3->root_args.rsize = 32768; /* XXX tunable? */ 266 nd3->root_args.wsize = 32768; 267 nd3->root_args.sotype = SOCK_STREAM; 268 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | 269 NFSMNT_RSIZE | NFSMNT_RESVPORT); 270 if (inaddr_to_sockaddr("boot.nfsroot.server", 271 &nd3->root_saddr)) { 272 printf("nfs_diskless: no server\n"); 273 return; 274 } 275 nd3->root_saddr.sin_port = htons(NFS_PORT); 276 fhlen = decode_nfshandle("boot.nfsroot.nfshandle", 277 &nd3->root_fh[0], NFSX_V3FHMAX); 278 if (fhlen == 0) { 279 printf("nfs_diskless: no NFS handle\n"); 280 return; 281 } 282 if (fhlen != nd3->root_fhsize) { 283 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen); 284 return; 285 } 286 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 287 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1); 288 freeenv(cp); 289 } 290 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 291 nfs_parse_options(cp, &nd3->root_args); 292 freeenv(cp); 293 } 294 295 nfs_diskless_valid = 3; 296 } else { 297 strlcpy(nd->myif.ifra_name, ifp->if_xname, 298 sizeof(nd->myif.ifra_name)); 299 300 /* set up gateway */ 301 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); 302 303 /* set up root mount */ 304 nd->root_args.rsize = 8192; /* XXX tunable? */ 305 nd->root_args.wsize = 8192; 306 nd->root_args.sotype = SOCK_STREAM; 307 nd->root_args.flags = (NFSMNT_WSIZE | 308 NFSMNT_RSIZE | NFSMNT_RESVPORT); 309 if (inaddr_to_sockaddr("boot.nfsroot.server", 310 &nd->root_saddr)) { 311 printf("nfs_diskless: no server\n"); 312 return; 313 } 314 nd->root_saddr.sin_port = htons(NFS_PORT); 315 if (decode_nfshandle("boot.nfsroot.nfshandle", 316 &nd->root_fh[0], NFSX_V2FH) == 0) { 317 printf("nfs_diskless: no NFS handle\n"); 318 return; 319 } 320 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 321 strncpy(nd->root_hostnam, cp, MNAMELEN - 1); 322 freeenv(cp); 323 } 324 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 325 struct nfs_args args; 326 327 /* 328 * XXX yech, convert between old and current 329 * arg format 330 */ 331 args.flags = nd->root_args.flags; 332 args.sotype = nd->root_args.sotype; 333 args.rsize = nd->root_args.rsize; 334 args.wsize = nd->root_args.wsize; 335 nfs_parse_options(cp, &args); 336 nd->root_args.flags = args.flags; 337 nd->root_args.sotype = args.sotype; 338 nd->root_args.rsize = args.rsize; 339 nd->root_args.wsize = args.wsize; 340 freeenv(cp); 341 } 342 343 nfs_diskless_valid = 1; 344 } 345 } 346 347 static int 348 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) 349 { 350 u_int32_t a[4]; 351 char *cp; 352 int count; 353 354 bzero(sa, sizeof(*sa)); 355 sa->sin_len = sizeof(*sa); 356 sa->sin_family = AF_INET; 357 358 if ((cp = kern_getenv(ev)) == NULL) 359 return (1); 360 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]); 361 freeenv(cp); 362 if (count != 4) 363 return (1); 364 sa->sin_addr.s_addr = 365 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]); 366 return (0); 367 } 368 369 static int 370 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) 371 { 372 char *cp; 373 u_int32_t a[6]; 374 int count; 375 376 bzero(sa, sizeof(*sa)); 377 sa->sdl_len = sizeof(*sa); 378 sa->sdl_family = AF_LINK; 379 sa->sdl_type = IFT_ETHER; 380 sa->sdl_alen = ETHER_ADDR_LEN; 381 if ((cp = kern_getenv(ev)) == NULL) 382 return (1); 383 count = sscanf(cp, "%x:%x:%x:%x:%x:%x", 384 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]); 385 freeenv(cp); 386 if (count != 6) 387 return (1); 388 sa->sdl_data[0] = a[0]; 389 sa->sdl_data[1] = a[1]; 390 sa->sdl_data[2] = a[2]; 391 sa->sdl_data[3] = a[3]; 392 sa->sdl_data[4] = a[4]; 393 sa->sdl_data[5] = a[5]; 394 return (0); 395 } 396 397 static int 398 decode_nfshandle(char *ev, u_char *fh, int maxfh) 399 { 400 u_char *cp, *ep; 401 int len, val; 402 403 ep = cp = kern_getenv(ev); 404 if (cp == NULL) 405 return (0); 406 if ((strlen(cp) < 2) || (*cp != 'X')) { 407 freeenv(ep); 408 return (0); 409 } 410 len = 0; 411 cp++; 412 for (;;) { 413 if (*cp == 'X') { 414 freeenv(ep); 415 return (len); 416 } 417 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) { 418 freeenv(ep); 419 return (0); 420 } 421 *(fh++) = val; 422 len++; 423 cp += 2; 424 if (len > maxfh) { 425 freeenv(ep); 426 return (0); 427 } 428 } 429 } 430 431 #if !defined(NEW_NFS_BOOT_BOOTP) 432 static void 433 nfs_rootconf(void) 434 { 435 436 nfs_setup_diskless(); 437 if (nfs_diskless_valid) 438 rootdevnames[0] = "nfs:"; 439 } 440 441 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL); 442 #endif 443 444
Indexes created Sat Sep 20 22:09:52 GMT 2025