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, "nfsv2") == 0) 116 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4); 117 else if (strcmp(o, "nfsv3") == 0) { 118 nd->flags &= ~NFSMNT_NFSV4; 119 nd->flags |= NFSMNT_NFSV3; 120 } else if (strcmp(o, "tcp") == 0) 121 nd->sotype = SOCK_STREAM; 122 else if (strcmp(o, "udp") == 0) 123 nd->sotype = SOCK_DGRAM; 124 else if (strncmp(o, "rsize=", 6) == 0) { 125 v = strtoul(o+6, NULL, 10); 126 if (checkrwsize(v, "rsize")) { 127 nd->rsize = (int) v; 128 nd->flags |= NFSMNT_RSIZE; 129 } 130 } else if (strncmp(o, "wsize=", 6) == 0) { 131 v = strtoul(o+6, NULL, 10); 132 if (checkrwsize(v, "wsize")) { 133 nd->wsize = (int) v; 134 nd->flags |= NFSMNT_WSIZE; 135 } 136 } else 137 printf("%s: skipping unknown option \"%s\"\n", 138 __func__, o); 139 } 140 free(opts, M_TEMP); 141 } 142 143 /* 144 * Populate the essential fields in the nfsv3_diskless structure. 145 * 146 * The loader is expected to export the following environment variables: 147 * 148 * boot.netif.name name of boot interface 149 * boot.netif.ip IP address on boot interface 150 * boot.netif.netmask netmask on boot interface 151 * boot.netif.gateway default gateway (optional) 152 * boot.netif.hwaddr hardware address of boot interface 153 * boot.nfsroot.server IP address of root filesystem server 154 * boot.nfsroot.path path of the root filesystem on server 155 * boot.nfsroot.nfshandle NFS handle for root filesystem on server 156 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only) 157 * boot.nfsroot.options NFS options for the root filesystem 158 */ 159 void 160 nfs_setup_diskless(void) 161 { 162 struct nfs_diskless *nd = &nfs_diskless; 163 struct nfsv3_diskless *nd3 = &nfsv3_diskless; 164 struct ifnet *ifp; 165 struct ifaddr *ifa; 166 struct sockaddr_dl *sdl, ourdl; 167 struct sockaddr_in myaddr, netmask; 168 char *cp; 169 int cnt, fhlen, is_nfsv3; 170 uint32_t len; 171 172 if (nfs_diskless_valid != 0) 173 return; 174 175 /* get handle size. If this succeeds, it's an NFSv3 setup. */ 176 if ((cp = getenv("boot.nfsroot.nfshandlelen")) != NULL) { 177 cnt = sscanf(cp, "%d", &len); 178 freeenv(cp); 179 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) { 180 printf("nfs_diskless: bad NFS handle len\n"); 181 return; 182 } 183 nd3->root_fhsize = len; 184 is_nfsv3 = 1; 185 } else 186 is_nfsv3 = 0; 187 /* set up interface */ 188 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr)) 189 return; 190 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) { 191 printf("nfs_diskless: no netmask\n"); 192 return; 193 } 194 if (is_nfsv3 != 0) { 195 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr)); 196 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr)); 197 ((struct sockaddr_in *) 198 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr = 199 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 200 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask)); 201 } else { 202 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr)); 203 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr)); 204 ((struct sockaddr_in *) 205 &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 206 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr; 207 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask)); 208 } 209 210 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) { 211 printf("nfs_diskless: no hardware address\n"); 212 return; 213 } 214 ifa = NULL; 215 CURVNET_SET(TD_TO_VNET(curthread)); 216 IFNET_RLOCK(); 217 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 218 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 219 if (ifa->ifa_addr->sa_family == AF_LINK) { 220 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 221 if ((sdl->sdl_type == ourdl.sdl_type) && 222 (sdl->sdl_alen == ourdl.sdl_alen) && 223 !bcmp(LLADDR(sdl), 224 LLADDR(&ourdl), 225 sdl->sdl_alen)) { 226 IFNET_RUNLOCK(); 227 CURVNET_RESTORE(); 228 goto match_done; 229 } 230 } 231 } 232 } 233 IFNET_RUNLOCK(); 234 CURVNET_RESTORE(); 235 printf("nfs_diskless: no interface\n"); 236 return; /* no matching interface */ 237 match_done: 238 setenv("boot.netif.name", ifp->if_xname); 239 if (is_nfsv3 != 0) { 240 strlcpy(nd3->myif.ifra_name, ifp->if_xname, 241 sizeof(nd3->myif.ifra_name)); 242 243 /* set up gateway */ 244 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway); 245 246 /* set up root mount */ 247 nd3->root_args.rsize = 32768; /* XXX tunable? */ 248 nd3->root_args.wsize = 32768; 249 nd3->root_args.sotype = SOCK_STREAM; 250 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | 251 NFSMNT_RSIZE | NFSMNT_RESVPORT); 252 if (inaddr_to_sockaddr("boot.nfsroot.server", 253 &nd3->root_saddr)) { 254 printf("nfs_diskless: no server\n"); 255 return; 256 } 257 nd3->root_saddr.sin_port = htons(NFS_PORT); 258 fhlen = decode_nfshandle("boot.nfsroot.nfshandle", 259 &nd3->root_fh[0], NFSX_V3FHMAX); 260 if (fhlen == 0) { 261 printf("nfs_diskless: no NFS handle\n"); 262 return; 263 } 264 if (fhlen != nd3->root_fhsize) { 265 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen); 266 return; 267 } 268 if ((cp = getenv("boot.nfsroot.path")) != NULL) { 269 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1); 270 freeenv(cp); 271 } 272 if ((cp = getenv("boot.nfsroot.options")) != NULL) { 273 nfs_parse_options(cp, &nd3->root_args); 274 freeenv(cp); 275 } 276 277 nfs_diskless_valid = 3; 278 } else { 279 strlcpy(nd->myif.ifra_name, ifp->if_xname, 280 sizeof(nd->myif.ifra_name)); 281 282 /* set up gateway */ 283 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway); 284 285 /* set up root mount */ 286 nd->root_args.rsize = 8192; /* XXX tunable? */ 287 nd->root_args.wsize = 8192; 288 nd->root_args.sotype = SOCK_STREAM; 289 nd->root_args.flags = (NFSMNT_WSIZE | 290 NFSMNT_RSIZE | NFSMNT_RESVPORT); 291 if (inaddr_to_sockaddr("boot.nfsroot.server", 292 &nd->root_saddr)) { 293 printf("nfs_diskless: no server\n"); 294 return; 295 } 296 nd->root_saddr.sin_port = htons(NFS_PORT); 297 if (decode_nfshandle("boot.nfsroot.nfshandle", 298 &nd->root_fh[0], NFSX_V2FH) == 0) { 299 printf("nfs_diskless: no NFS handle\n"); 300 return; 301 } 302 if ((cp = getenv("boot.nfsroot.path")) != NULL) { 303 strncpy(nd->root_hostnam, cp, MNAMELEN - 1); 304 freeenv(cp); 305 } 306 if ((cp = getenv("boot.nfsroot.options")) != NULL) { 307 struct nfs_args args; 308 309 /* 310 * XXX yech, convert between old and current 311 * arg format 312 */ 313 args.flags = nd->root_args.flags; 314 args.sotype = nd->root_args.sotype; 315 args.rsize = nd->root_args.rsize; 316 args.wsize = nd->root_args.wsize; 317 nfs_parse_options(cp, &args); 318 nd->root_args.flags = args.flags; 319 nd->root_args.sotype = args.sotype; 320 nd->root_args.rsize = args.rsize; 321 nd->root_args.wsize = args.wsize; 322 freeenv(cp); 323 } 324 325 nfs_diskless_valid = 1; 326 } 327 } 328 329 static int 330 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa) 331 { 332 u_int32_t a[4]; 333 char *cp; 334 int count; 335 336 bzero(sa, sizeof(*sa)); 337 sa->sin_len = sizeof(*sa); 338 sa->sin_family = AF_INET; 339 340 if ((cp = getenv(ev)) == NULL) 341 return (1); 342 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]); 343 freeenv(cp); 344 if (count != 4) 345 return (1); 346 sa->sin_addr.s_addr = 347 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]); 348 return (0); 349 } 350 351 static int 352 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa) 353 { 354 char *cp; 355 u_int32_t a[6]; 356 int count; 357 358 bzero(sa, sizeof(*sa)); 359 sa->sdl_len = sizeof(*sa); 360 sa->sdl_family = AF_LINK; 361 sa->sdl_type = IFT_ETHER; 362 sa->sdl_alen = ETHER_ADDR_LEN; 363 if ((cp = getenv(ev)) == NULL) 364 return (1); 365 count = sscanf(cp, "%x:%x:%x:%x:%x:%x", 366 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]); 367 freeenv(cp); 368 if (count != 6) 369 return (1); 370 sa->sdl_data[0] = a[0]; 371 sa->sdl_data[1] = a[1]; 372 sa->sdl_data[2] = a[2]; 373 sa->sdl_data[3] = a[3]; 374 sa->sdl_data[4] = a[4]; 375 sa->sdl_data[5] = a[5]; 376 return (0); 377 } 378 379 static int 380 decode_nfshandle(char *ev, u_char *fh, int maxfh) 381 { 382 u_char *cp, *ep; 383 int len, val; 384 385 ep = cp = getenv(ev); 386 if (cp == NULL) 387 return (0); 388 if ((strlen(cp) < 2) || (*cp != 'X')) { 389 freeenv(ep); 390 return (0); 391 } 392 len = 0; 393 cp++; 394 for (;;) { 395 if (*cp == 'X') { 396 freeenv(ep); 397 return (len); 398 } 399 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) { 400 freeenv(ep); 401 return (0); 402 } 403 *(fh++) = val; 404 len++; 405 cp += 2; 406 if (len > maxfh) { 407 freeenv(ep); 408 return (0); 409 } 410 } 411 } 412 413 #if !defined(BOOTP_NFSROOT) 414 static void 415 nfs_rootconf(void) 416 { 417 418 nfs_setup_diskless(); 419 if (nfs_diskless_valid) 420 rootdevnames[0] = "nfs:"; 421 } 422 423 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL); 424 #endif 425 426