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: releng/8.2/sys/nfsclient/nfs_diskless.c 212716 2010-09-16 01:02:53Z rmacklem $");
37
38 #include "opt_bootp.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/mount.h>
45 #include <sys/socket.h>
46
47 #include <net/if.h>
48 #include <net/if_dl.h>
49 #include <net/if_types.h>
50 #include <net/if_var.h>
51 #include <net/ethernet.h>
52 #include <net/vnet.h>
53
54 #include <netinet/in.h>
55 #include <nfs/nfsproto.h>
56 #include <nfsclient/nfs.h>
57 #include <nfsclient/nfsdiskless.h>
58
59 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
60 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
61 static int decode_nfshandle(char *ev, u_char *fh, int maxfh);
62
63 /*
64 * Validate/sanity check a rsize/wsize parameter.
65 */
66 static int
67 checkrwsize(unsigned long v, const char *name)
68 {
69 /*
70 * 32K is used as an upper bound because most servers
71 * limit block size to satisfy IPv4's limit of
72 * 64K/reassembled packet. The lower bound is pretty
73 * much arbitrary.
74 */
75 if (!(4 <= v && v <= 32*1024)) {
76 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
77 return 0;
78 } else
79 return 1;
80 }
81
82 /*
83 * Parse mount options and apply them to the supplied
84 * nfs_diskless state. Used also by bootp/dhcp support.
85 */
86 void
87 nfs_parse_options(const char *envopts, struct nfs_args *nd)
88 {
89 char *opts, *o, *otmp;
90 unsigned long v;
91
92 opts = strdup(envopts, M_TEMP);
93 otmp = opts;
94 while ((o = strsep(&otmp, ":;, ")) != NULL) {
95 if (*o == '\0')
96 ; /* Skip empty options. */
97 else if (strcmp(o, "soft") == 0)
98 nd->flags |= NFSMNT_SOFT;
99 else if (strcmp(o, "intr") == 0)
100 nd->flags |= NFSMNT_INT;
101 else if (strcmp(o, "conn") == 0)
102 nd->flags |= NFSMNT_NOCONN;
103 else if (strcmp(o, "nolockd") == 0)
104 nd->flags |= NFSMNT_NOLOCKD;
105 else if (strcmp(o, "nfsv2") == 0)
106 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
107 else if (strcmp(o, "nfsv3") == 0) {
108 nd->flags &= ~NFSMNT_NFSV4;
109 nd->flags |= NFSMNT_NFSV3;
110 } else if (strcmp(o, "tcp") == 0)
111 nd->sotype = SOCK_STREAM;
112 else if (strcmp(o, "udp") == 0)
113 nd->sotype = SOCK_DGRAM;
114 else if (strncmp(o, "rsize=", 6) == 0) {
115 v = strtoul(o+6, NULL, 10);
116 if (checkrwsize(v, "rsize")) {
117 nd->rsize = (int) v;
118 nd->flags |= NFSMNT_RSIZE;
119 }
120 } else if (strncmp(o, "wsize=", 6) == 0) {
121 v = strtoul(o+6, NULL, 10);
122 if (checkrwsize(v, "wsize")) {
123 nd->wsize = (int) v;
124 nd->flags |= NFSMNT_WSIZE;
125 }
126 } else
127 printf("%s: skipping unknown option \"%s\"\n",
128 __func__, o);
129 }
130 free(opts, M_TEMP);
131 }
132
133 /*
134 * Populate the essential fields in the nfsv3_diskless structure.
135 *
136 * The loader is expected to export the following environment variables:
137 *
138 * boot.netif.name name of boot interface
139 * boot.netif.ip IP address on boot interface
140 * boot.netif.netmask netmask on boot interface
141 * boot.netif.gateway default gateway (optional)
142 * boot.netif.hwaddr hardware address of boot interface
143 * boot.nfsroot.server IP address of root filesystem server
144 * boot.nfsroot.path path of the root filesystem on server
145 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
146 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only)
147 * boot.nfsroot.options NFS options for the root filesystem
148 */
149 void
150 nfs_setup_diskless(void)
151 {
152 struct nfs_diskless *nd = &nfs_diskless;
153 struct nfsv3_diskless *nd3 = &nfsv3_diskless;
154 struct ifnet *ifp;
155 struct ifaddr *ifa;
156 struct sockaddr_dl *sdl, ourdl;
157 struct sockaddr_in myaddr, netmask;
158 char *cp;
159 int cnt, fhlen, is_nfsv3;
160 uint32_t len;
161
162 if (nfs_diskless_valid != 0)
163 return;
164
165 /* get handle size. If this succeeds, it's an NFSv3 setup. */
166 if ((cp = getenv("boot.nfsroot.nfshandlelen")) != NULL) {
167 cnt = sscanf(cp, "%d", &len);
168 freeenv(cp);
169 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
170 printf("nfs_diskless: bad NFS handle len\n");
171 return;
172 }
173 nd3->root_fhsize = len;
174 is_nfsv3 = 1;
175 } else
176 is_nfsv3 = 0;
177 /* set up interface */
178 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
179 return;
180 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
181 printf("nfs_diskless: no netmask\n");
182 return;
183 }
184 if (is_nfsv3 != 0) {
185 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
186 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
187 ((struct sockaddr_in *)
188 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
189 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
190 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
191 } else {
192 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
193 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
194 ((struct sockaddr_in *)
195 &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
196 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
197 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
198 }
199
200 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
201 printf("nfs_diskless: no hardware address\n");
202 return;
203 }
204 ifa = NULL;
205 IFNET_RLOCK();
206 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
207 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
208 if (ifa->ifa_addr->sa_family == AF_LINK) {
209 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
210 if ((sdl->sdl_type == ourdl.sdl_type) &&
211 (sdl->sdl_alen == ourdl.sdl_alen) &&
212 !bcmp(LLADDR(sdl),
213 LLADDR(&ourdl),
214 sdl->sdl_alen)) {
215 IFNET_RUNLOCK();
216 goto match_done;
217 }
218 }
219 }
220 }
221 IFNET_RUNLOCK();
222 printf("nfs_diskless: no interface\n");
223 return; /* no matching interface */
224 match_done:
225 setenv("boot.netif.name", ifp->if_xname);
226 if (is_nfsv3 != 0) {
227 strlcpy(nd3->myif.ifra_name, ifp->if_xname,
228 sizeof(nd3->myif.ifra_name));
229
230 /* set up gateway */
231 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
232
233 /* set up root mount */
234 nd3->root_args.rsize = 32768; /* XXX tunable? */
235 nd3->root_args.wsize = 32768;
236 nd3->root_args.sotype = SOCK_STREAM;
237 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
238 NFSMNT_RSIZE | NFSMNT_RESVPORT);
239 if (inaddr_to_sockaddr("boot.nfsroot.server",
240 &nd3->root_saddr)) {
241 printf("nfs_diskless: no server\n");
242 return;
243 }
244 nd3->root_saddr.sin_port = htons(NFS_PORT);
245 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
246 &nd3->root_fh[0], NFSX_V3FHMAX);
247 if (fhlen == 0) {
248 printf("nfs_diskless: no NFS handle\n");
249 return;
250 }
251 if (fhlen != nd3->root_fhsize) {
252 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
253 return;
254 }
255 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
256 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
257 freeenv(cp);
258 }
259 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
260 nfs_parse_options(cp, &nd3->root_args);
261 freeenv(cp);
262 }
263
264 nfs_diskless_valid = 3;
265 } else {
266 strlcpy(nd->myif.ifra_name, ifp->if_xname,
267 sizeof(nd->myif.ifra_name));
268
269 /* set up gateway */
270 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
271
272 /* set up root mount */
273 nd->root_args.rsize = 8192; /* XXX tunable? */
274 nd->root_args.wsize = 8192;
275 nd->root_args.sotype = SOCK_STREAM;
276 nd->root_args.flags = (NFSMNT_WSIZE |
277 NFSMNT_RSIZE | NFSMNT_RESVPORT);
278 if (inaddr_to_sockaddr("boot.nfsroot.server",
279 &nd->root_saddr)) {
280 printf("nfs_diskless: no server\n");
281 return;
282 }
283 nd->root_saddr.sin_port = htons(NFS_PORT);
284 if (decode_nfshandle("boot.nfsroot.nfshandle",
285 &nd->root_fh[0], NFSX_V2FH) == 0) {
286 printf("nfs_diskless: no NFS handle\n");
287 return;
288 }
289 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
290 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
291 freeenv(cp);
292 }
293 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
294 struct nfs_args args;
295
296 /*
297 * XXX yech, convert between old and current
298 * arg format
299 */
300 args.flags = nd->root_args.flags;
301 args.sotype = nd->root_args.sotype;
302 args.rsize = nd->root_args.rsize;
303 args.wsize = nd->root_args.wsize;
304 nfs_parse_options(cp, &args);
305 nd->root_args.flags = args.flags;
306 nd->root_args.sotype = args.sotype;
307 nd->root_args.rsize = args.rsize;
308 nd->root_args.wsize = args.wsize;
309 freeenv(cp);
310 }
311
312 nfs_diskless_valid = 1;
313 }
314 }
315
316 static int
317 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
318 {
319 u_int32_t a[4];
320 char *cp;
321 int count;
322
323 bzero(sa, sizeof(*sa));
324 sa->sin_len = sizeof(*sa);
325 sa->sin_family = AF_INET;
326
327 if ((cp = getenv(ev)) == NULL)
328 return (1);
329 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
330 freeenv(cp);
331 if (count != 4)
332 return (1);
333 sa->sin_addr.s_addr =
334 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
335 return (0);
336 }
337
338 static int
339 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
340 {
341 char *cp;
342 u_int32_t a[6];
343 int count;
344
345 bzero(sa, sizeof(*sa));
346 sa->sdl_len = sizeof(*sa);
347 sa->sdl_family = AF_LINK;
348 sa->sdl_type = IFT_ETHER;
349 sa->sdl_alen = ETHER_ADDR_LEN;
350 if ((cp = getenv(ev)) == NULL)
351 return (1);
352 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
353 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
354 freeenv(cp);
355 if (count != 6)
356 return (1);
357 sa->sdl_data[0] = a[0];
358 sa->sdl_data[1] = a[1];
359 sa->sdl_data[2] = a[2];
360 sa->sdl_data[3] = a[3];
361 sa->sdl_data[4] = a[4];
362 sa->sdl_data[5] = a[5];
363 return (0);
364 }
365
366 static int
367 decode_nfshandle(char *ev, u_char *fh, int maxfh)
368 {
369 u_char *cp, *ep;
370 int len, val;
371
372 ep = cp = getenv(ev);
373 if (cp == NULL)
374 return (0);
375 if ((strlen(cp) < 2) || (*cp != 'X')) {
376 freeenv(ep);
377 return (0);
378 }
379 len = 0;
380 cp++;
381 for (;;) {
382 if (*cp == 'X') {
383 freeenv(ep);
384 return (len);
385 }
386 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
387 freeenv(ep);
388 return (0);
389 }
390 *(fh++) = val;
391 len++;
392 cp += 2;
393 if (len > maxfh) {
394 freeenv(ep);
395 return (0);
396 }
397 }
398 }
399
400 #if !defined(BOOTP_NFSROOT)
401 static void
402 nfs_rootconf(void)
403 {
404
405 nfs_setup_diskless();
406 if (nfs_diskless_valid)
407 rootdevnames[0] = "nfs:";
408 }
409
410 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
411 #endif
412
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