1 /* $NetBSD: nfs_diskless.c,v 1.1.1.1 2013/09/30 07:19:32 dholland 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 221436 2011-05-04 13:27:45Z ru "); */
38 __RCSID("$NetBSD: nfs_diskless.c,v 1.1.1.1 2013/09/30 07:19:32 dholland Exp $");
39
40 #include "opt_bootp.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/jail.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/socket.h>
49
50 #include <net/if.h>
51 #include <net/if_dl.h>
52 #include <net/if_types.h>
53 #include <net/if_var.h>
54 #include <net/ethernet.h>
55 #include <net/vnet.h>
56
57 #include <netinet/in.h>
58 #include <nfs/nfsproto.h>
59 #include <nfsclient/nfs.h>
60 #include <nfs/nfsdiskless.h>
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
checkrwsize(unsigned long v,const char * name)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
nfs_parse_options(const char * envopts,struct nfs_args * nd)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.nfsroot.server IP address of root filesystem server
158 * boot.nfsroot.path path of the root filesystem on server
159 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
160 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only)
161 * boot.nfsroot.options NFS options for the root filesystem
162 */
163 void
nfs_setup_diskless(void)164 nfs_setup_diskless(void)
165 {
166 struct nfs_diskless *nd = &nfs_diskless;
167 struct nfsv3_diskless *nd3 = &nfsv3_diskless;
168 struct ifnet *ifp;
169 struct ifaddr *ifa;
170 struct sockaddr_dl *sdl, ourdl;
171 struct sockaddr_in myaddr, netmask;
172 char *cp;
173 int cnt, fhlen, is_nfsv3;
174 uint32_t len;
175
176 if (nfs_diskless_valid != 0)
177 return;
178
179 /* get handle size. If this succeeds, it's an NFSv3 setup. */
180 if ((cp = getenv("boot.nfsroot.nfshandlelen")) != NULL) {
181 cnt = sscanf(cp, "%d", &len);
182 freeenv(cp);
183 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
184 printf("nfs_diskless: bad NFS handle len\n");
185 return;
186 }
187 nd3->root_fhsize = len;
188 is_nfsv3 = 1;
189 } else
190 is_nfsv3 = 0;
191 /* set up interface */
192 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
193 return;
194 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
195 printf("nfs_diskless: no netmask\n");
196 return;
197 }
198 if (is_nfsv3 != 0) {
199 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
200 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
201 ((struct sockaddr_in *)
202 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
203 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
204 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
205 } else {
206 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
207 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
208 ((struct sockaddr_in *)
209 &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
210 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
211 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
212 }
213
214 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
215 printf("nfs_diskless: no hardware address\n");
216 return;
217 }
218 ifa = NULL;
219 CURVNET_SET(TD_TO_VNET(curthread));
220 IFNET_RLOCK();
221 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
222 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
223 if (ifa->ifa_addr->sa_family == AF_LINK) {
224 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
225 if ((sdl->sdl_type == ourdl.sdl_type) &&
226 (sdl->sdl_alen == ourdl.sdl_alen) &&
227 !bcmp(LLADDR(sdl),
228 LLADDR(&ourdl),
229 sdl->sdl_alen)) {
230 IFNET_RUNLOCK();
231 CURVNET_RESTORE();
232 goto match_done;
233 }
234 }
235 }
236 }
237 IFNET_RUNLOCK();
238 CURVNET_RESTORE();
239 printf("nfs_diskless: no interface\n");
240 return; /* no matching interface */
241 match_done:
242 setenv("boot.netif.name", ifp->if_xname);
243 if (is_nfsv3 != 0) {
244 strlcpy(nd3->myif.ifra_name, ifp->if_xname,
245 sizeof(nd3->myif.ifra_name));
246
247 /* set up gateway */
248 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
249
250 /* set up root mount */
251 nd3->root_args.rsize = 32768; /* XXX tunable? */
252 nd3->root_args.wsize = 32768;
253 nd3->root_args.sotype = SOCK_STREAM;
254 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
255 NFSMNT_RSIZE | NFSMNT_RESVPORT);
256 if (inaddr_to_sockaddr("boot.nfsroot.server",
257 &nd3->root_saddr)) {
258 printf("nfs_diskless: no server\n");
259 return;
260 }
261 nd3->root_saddr.sin_port = htons(NFS_PORT);
262 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
263 &nd3->root_fh[0], NFSX_V3FHMAX);
264 if (fhlen == 0) {
265 printf("nfs_diskless: no NFS handle\n");
266 return;
267 }
268 if (fhlen != nd3->root_fhsize) {
269 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
270 return;
271 }
272 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
273 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
274 freeenv(cp);
275 }
276 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
277 nfs_parse_options(cp, &nd3->root_args);
278 freeenv(cp);
279 }
280
281 nfs_diskless_valid = 3;
282 } else {
283 strlcpy(nd->myif.ifra_name, ifp->if_xname,
284 sizeof(nd->myif.ifra_name));
285
286 /* set up gateway */
287 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
288
289 /* set up root mount */
290 nd->root_args.rsize = 8192; /* XXX tunable? */
291 nd->root_args.wsize = 8192;
292 nd->root_args.sotype = SOCK_STREAM;
293 nd->root_args.flags = (NFSMNT_WSIZE |
294 NFSMNT_RSIZE | NFSMNT_RESVPORT);
295 if (inaddr_to_sockaddr("boot.nfsroot.server",
296 &nd->root_saddr)) {
297 printf("nfs_diskless: no server\n");
298 return;
299 }
300 nd->root_saddr.sin_port = htons(NFS_PORT);
301 if (decode_nfshandle("boot.nfsroot.nfshandle",
302 &nd->root_fh[0], NFSX_V2FH) == 0) {
303 printf("nfs_diskless: no NFS handle\n");
304 return;
305 }
306 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
307 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
308 freeenv(cp);
309 }
310 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
311 struct nfs_args args;
312
313 /*
314 * XXX yech, convert between old and current
315 * arg format
316 */
317 args.flags = nd->root_args.flags;
318 args.sotype = nd->root_args.sotype;
319 args.rsize = nd->root_args.rsize;
320 args.wsize = nd->root_args.wsize;
321 nfs_parse_options(cp, &args);
322 nd->root_args.flags = args.flags;
323 nd->root_args.sotype = args.sotype;
324 nd->root_args.rsize = args.rsize;
325 nd->root_args.wsize = args.wsize;
326 freeenv(cp);
327 }
328
329 nfs_diskless_valid = 1;
330 }
331 }
332
333 static int
inaddr_to_sockaddr(char * ev,struct sockaddr_in * sa)334 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
335 {
336 u_int32_t a[4];
337 char *cp;
338 int count;
339
340 bzero(sa, sizeof(*sa));
341 sa->sin_len = sizeof(*sa);
342 sa->sin_family = AF_INET;
343
344 if ((cp = getenv(ev)) == NULL)
345 return (1);
346 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
347 freeenv(cp);
348 if (count != 4)
349 return (1);
350 sa->sin_addr.s_addr =
351 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
352 return (0);
353 }
354
355 static int
hwaddr_to_sockaddr(char * ev,struct sockaddr_dl * sa)356 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
357 {
358 char *cp;
359 u_int32_t a[6];
360 int count;
361
362 bzero(sa, sizeof(*sa));
363 sa->sdl_len = sizeof(*sa);
364 sa->sdl_family = AF_LINK;
365 sa->sdl_type = IFT_ETHER;
366 sa->sdl_alen = ETHER_ADDR_LEN;
367 if ((cp = getenv(ev)) == NULL)
368 return (1);
369 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
370 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
371 freeenv(cp);
372 if (count != 6)
373 return (1);
374 sa->sdl_data[0] = a[0];
375 sa->sdl_data[1] = a[1];
376 sa->sdl_data[2] = a[2];
377 sa->sdl_data[3] = a[3];
378 sa->sdl_data[4] = a[4];
379 sa->sdl_data[5] = a[5];
380 return (0);
381 }
382
383 static int
decode_nfshandle(char * ev,u_char * fh,int maxfh)384 decode_nfshandle(char *ev, u_char *fh, int maxfh)
385 {
386 u_char *cp, *ep;
387 int len, val;
388
389 ep = cp = getenv(ev);
390 if (cp == NULL)
391 return (0);
392 if ((strlen(cp) < 2) || (*cp != 'X')) {
393 freeenv(ep);
394 return (0);
395 }
396 len = 0;
397 cp++;
398 for (;;) {
399 if (*cp == 'X') {
400 freeenv(ep);
401 return (len);
402 }
403 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
404 freeenv(ep);
405 return (0);
406 }
407 *(fh++) = val;
408 len++;
409 cp += 2;
410 if (len > maxfh) {
411 freeenv(ep);
412 return (0);
413 }
414 }
415 }
416
417 #if !defined(BOOTP_NFSROOT)
418 static void
nfs_rootconf(void)419 nfs_rootconf(void)
420 {
421
422 nfs_setup_diskless();
423 if (nfs_diskless_valid)
424 rootdevnames[0] = "nfs:";
425 }
426
427 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
428 #endif
429
430