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("$FreeBSD$"); 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 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa); 61 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa); 62 static int decode_nfshandle(char *ev, u_char *fh, int maxfh); 63 64 /* 65 * This structure must be filled in by a primary bootstrap or bootstrap 66 * server for a diskless/dataless machine. It is initialized below just 67 * to ensure that it is allocated to initialized data (.data not .bss). 68 */ 69 struct nfs_diskless nfs_diskless = { { { 0 } } }; 70 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 71 int nfs_diskless_valid = 0; 72 73 /* 74 * Validate/sanity check a rsize/wsize parameter. 75 */ 76 static int 77 checkrwsize(unsigned long v, const char *name) 78 { 79 /* 80 * 32K is used as an upper bound because most servers 81 * limit block size to satisfy IPv4's limit of 82 * 64K/reassembled packet. The lower bound is pretty 83 * much arbitrary. 84 */ 85 if (!(4 <= v && v <= 32*1024)) { 86 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v); 87 return 0; 88 } else 89 return 1; 90 } 91 92 /* 93 * Parse mount options and apply them to the supplied 94 * nfs_diskless state. Used also by bootp/dhcp support. 95 */ 96 void 97 nfs_parse_options(const char *envopts, struct nfs_args *nd) 98 { 99 char *opts, *o, *otmp; 100 unsigned long v; 101 102 opts = strdup(envopts, M_TEMP); 103 otmp = opts; 104 while ((o = strsep(&otmp, ":;, ")) != NULL) { 105 if (*o == '\0') 106 ; /* Skip empty options. */ 107 else if (strcmp(o, "soft") == 0) 108 nd->flags |= NFSMNT_SOFT; 109 else if (strcmp(o, "intr") == 0) 110 nd->flags |= NFSMNT_INT; 111 else if (strcmp(o, "conn") == 0) 112 nd->flags |= NFSMNT_NOCONN; 113 else if (strcmp(o, "nolockd") == 0) 114 nd->flags |= NFSMNT_NOLOCKD; 115 else if (strcmp(o, "nocto") == 0) 116 nd->flags |= NFSMNT_NOCTO; 117 else if (strcmp(o, "nfsv2") == 0) 118 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4); 119 else if (strcmp(o, "nfsv3") == 0) { 120 nd->flags &= ~NFSMNT_NFSV4; 121 nd->flags |= NFSMNT_NFSV3; 122 } else if (strcmp(o, "tcp") == 0) 123 nd->sotype = SOCK_STREAM; 124 else if (strcmp(o, "udp") == 0) 125 nd->sotype = SOCK_DGRAM; 126 else if (strncmp(o, "rsize=", 6) == 0) { 127 v = strtoul(o+6, NULL, 10); 128 if (checkrwsize(v, "rsize")) { 129 nd->rsize = (int) v; 130 nd->flags |= NFSMNT_RSIZE; 131 } 132 } else if (strncmp(o, "wsize=", 6) == 0) { 133 v = strtoul(o+6, NULL, 10); 134 if (checkrwsize(v, "wsize")) { 135 nd->wsize = (int) v; 136 nd->flags |= NFSMNT_WSIZE; 137 } 138 } else 139 printf("%s: skipping unknown option \"%s\"\n", 140 __func__, o); 141 } 142 free(opts, M_TEMP); 143 } 144 145 /* 146 * Populate the essential fields in the nfsv3_diskless structure. 147 * 148 * The loader is expected to export the following environment variables: 149 * 150 * boot.netif.name name of boot interface 151 * boot.netif.ip IP address on boot interface 152 * boot.netif.netmask netmask on boot interface 153 * boot.netif.gateway default gateway (optional) 154 * boot.netif.hwaddr hardware address of boot interface 155 * boot.nfsroot.server IP address of root filesystem server 156 * boot.nfsroot.path path of the root filesystem on server 157 * boot.nfsroot.nfshandle NFS handle for root filesystem on server 158 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only) 159 * boot.nfsroot.options NFS options for the root filesystem 160 */ 161 void 162 nfs_setup_diskless(void) 163 { 164 struct nfs_diskless *nd = &nfs_diskless; 165 struct nfsv3_diskless *nd3 = &nfsv3_diskless; 166 struct ifnet *ifp; 167 struct ifaddr *ifa; 168 struct sockaddr_dl *sdl, ourdl; 169 struct sockaddr_in myaddr, netmask; 170 char *cp; 171 int cnt, fhlen, is_nfsv3; 172 uint32_t len; 173 174 if (nfs_diskless_valid != 0) 175 return; 176 177 /* get handle size. If this succeeds, it's an NFSv3 setup. */ 178 if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) { 179 cnt = sscanf(cp, "%d", &len); 180 freeenv(cp); 181 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) { 182 printf("nfs_diskless: bad NFS handle len\n"); 183 return; 184 } 185 nd3->root_fhsize = len; 186 is_nfsv3 = 1; 187 } else 188 is_nfsv3 = 0; 189 /* set up interface */ 190 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) 191 return; 192 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { 193 printf("nfs_diskless: no netmask\n"); 194 return; 195 } 196 if (is_nfsv3 != 0) { 197 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr)); 198 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr)); 199 ((struct sockaddr_in *) 200 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr = 201 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 202 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask)); 203 } else { 204 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); 205 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); 206 ((struct sockaddr_in *) 207 &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 208 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 209 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); 210 } 211 212 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { 213 printf("nfs_diskless: no hardware address\n"); 214 return; 215 } 216 ifa = NULL; 217 CURVNET_SET(TD_TO_VNET(curthread)); 218 IFNET_RLOCK(); 219 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 220 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 221 if (ifa->ifa_addr->sa_family == AF_LINK) { 222 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 223 if ((sdl->sdl_type == ourdl.sdl_type) && 224 (sdl->sdl_alen == ourdl.sdl_alen) && 225 !bcmp(LLADDR(sdl), 226 LLADDR(&ourdl), 227 sdl->sdl_alen)) { 228 IFNET_RUNLOCK(); 229 CURVNET_RESTORE(); 230 goto match_done; 231 } 232 } 233 } 234 } 235 IFNET_RUNLOCK(); 236 CURVNET_RESTORE(); 237 printf("nfs_diskless: no interface\n"); 238 return; /* no matching interface */ 239 match_done: 240 kern_setenv("boot.netif.name", ifp->if_xname); 241 if (is_nfsv3 != 0) { 242 strlcpy(nd3->myif.ifra_name, ifp->if_xname, 243 sizeof(nd3->myif.ifra_name)); 244 245 /* set up gateway */ 246 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway); 247 248 /* set up root mount */ 249 nd3->root_args.rsize = 32768; /* XXX tunable? */ 250 nd3->root_args.wsize = 32768; 251 nd3->root_args.sotype = SOCK_STREAM; 252 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | 253 NFSMNT_RSIZE | NFSMNT_RESVPORT); 254 if (inaddr_to_sockaddr("boot.nfsroot.server", 255 &nd3->root_saddr)) { 256 printf("nfs_diskless: no server\n"); 257 return; 258 } 259 nd3->root_saddr.sin_port = htons(NFS_PORT); 260 fhlen = decode_nfshandle("boot.nfsroot.nfshandle", 261 &nd3->root_fh[0], NFSX_V3FHMAX); 262 if (fhlen == 0) { 263 printf("nfs_diskless: no NFS handle\n"); 264 return; 265 } 266 if (fhlen != nd3->root_fhsize) { 267 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen); 268 return; 269 } 270 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 271 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1); 272 freeenv(cp); 273 } 274 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 275 nfs_parse_options(cp, &nd3->root_args); 276 freeenv(cp); 277 } 278 279 nfs_diskless_valid = 3; 280 } else { 281 strlcpy(nd->myif.ifra_name, ifp->if_xname, 282 sizeof(nd->myif.ifra_name)); 283 284 /* set up gateway */ 285 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); 286 287 /* set up root mount */ 288 nd->root_args.rsize = 8192; /* XXX tunable? */ 289 nd->root_args.wsize = 8192; 290 nd->root_args.sotype = SOCK_STREAM; 291 nd->root_args.flags = (NFSMNT_WSIZE | 292 NFSMNT_RSIZE | NFSMNT_RESVPORT); 293 if (inaddr_to_sockaddr("boot.nfsroot.server", 294 &nd->root_saddr)) { 295 printf("nfs_diskless: no server\n"); 296 return; 297 } 298 nd->root_saddr.sin_port = htons(NFS_PORT); 299 if (decode_nfshandle("boot.nfsroot.nfshandle", 300 &nd->root_fh[0], NFSX_V2FH) == 0) { 301 printf("nfs_diskless: no NFS handle\n"); 302 return; 303 } 304 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) { 305 strncpy(nd->root_hostnam, cp, MNAMELEN - 1); 306 freeenv(cp); 307 } 308 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) { 309 struct nfs_args args; 310 311 /* 312 * XXX yech, convert between old and current 313 * arg format 314 */ 315 args.flags = nd->root_args.flags; 316 args.sotype = nd->root_args.sotype; 317 args.rsize = nd->root_args.rsize; 318 args.wsize = nd->root_args.wsize; 319 nfs_parse_options(cp, &args); 320 nd->root_args.flags = args.flags; 321 nd->root_args.sotype = args.sotype; 322 nd->root_args.rsize = args.rsize; 323 nd->root_args.wsize = args.wsize; 324 freeenv(cp); 325 } 326 327 nfs_diskless_valid = 1; 328 } 329 } 330 331 static int 332 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) 333 { 334 u_int32_t a[4]; 335 char *cp; 336 int count; 337 338 bzero(sa, sizeof(*sa)); 339 sa->sin_len = sizeof(*sa); 340 sa->sin_family = AF_INET; 341 342 if ((cp = kern_getenv(ev)) == NULL) 343 return (1); 344 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]); 345 freeenv(cp); 346 if (count != 4) 347 return (1); 348 sa->sin_addr.s_addr = 349 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]); 350 return (0); 351 } 352 353 static int 354 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) 355 { 356 char *cp; 357 u_int32_t a[6]; 358 int count; 359 360 bzero(sa, sizeof(*sa)); 361 sa->sdl_len = sizeof(*sa); 362 sa->sdl_family = AF_LINK; 363 sa->sdl_type = IFT_ETHER; 364 sa->sdl_alen = ETHER_ADDR_LEN; 365 if ((cp = kern_getenv(ev)) == NULL) 366 return (1); 367 count = sscanf(cp, "%x:%x:%x:%x:%x:%x", 368 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]); 369 freeenv(cp); 370 if (count != 6) 371 return (1); 372 sa->sdl_data[0] = a[0]; 373 sa->sdl_data[1] = a[1]; 374 sa->sdl_data[2] = a[2]; 375 sa->sdl_data[3] = a[3]; 376 sa->sdl_data[4] = a[4]; 377 sa->sdl_data[5] = a[5]; 378 return (0); 379 } 380 381 static int 382 decode_nfshandle(char *ev, u_char *fh, int maxfh) 383 { 384 u_char *cp, *ep; 385 int len, val; 386 387 ep = cp = kern_getenv(ev); 388 if (cp == NULL) 389 return (0); 390 if ((strlen(cp) < 2) || (*cp != 'X')) { 391 freeenv(ep); 392 return (0); 393 } 394 len = 0; 395 cp++; 396 for (;;) { 397 if (*cp == 'X') { 398 freeenv(ep); 399 return (len); 400 } 401 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) { 402 freeenv(ep); 403 return (0); 404 } 405 *(fh++) = val; 406 len++; 407 cp += 2; 408 if (len > maxfh) { 409 freeenv(ep); 410 return (0); 411 } 412 } 413 } 414 415 #if !defined(BOOTP_NFSROOT) 416 static void 417 nfs_rootconf(void) 418 { 419 420 nfs_setup_diskless(); 421 if (nfs_diskless_valid) 422 rootdevnames[0] = "nfs:"; 423 } 424 425 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL); 426 #endif 427 428