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 * 3. 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("$FreeBSD$"); 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 437 438