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 #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
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 time_t timeout_at;
176
177 if (nfs_diskless_valid != 0)
178 return;
179
180 /* get handle size. If this succeeds, it's an NFSv3 setup. */
181 if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) {
182 cnt = sscanf(cp, "%d", &len);
183 freeenv(cp);
184 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
185 printf("nfs_diskless: bad NFS handle len\n");
186 return;
187 }
188 nd3->root_fhsize = len;
189 is_nfsv3 = 1;
190 } else
191 is_nfsv3 = 0;
192 /* set up interface */
193 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
194 return;
195 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
196 printf("nfs_diskless: no netmask\n");
197 return;
198 }
199 if (is_nfsv3 != 0) {
200 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
201 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
202 ((struct sockaddr_in *)
203 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
204 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
205 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
206 } else {
207 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
208 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
209 ((struct sockaddr_in *)
210 &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
211 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
212 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
213 }
214
215 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
216 printf("nfs_diskless: no hardware address\n");
217 return;
218 }
219 ifa = NULL;
220 timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS;
221 retry:
222 CURVNET_SET(TD_TO_VNET(curthread));
223 IFNET_RLOCK();
224 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
225 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
226 if (ifa->ifa_addr->sa_family == AF_LINK) {
227 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
228 if ((sdl->sdl_type == ourdl.sdl_type) &&
229 (sdl->sdl_alen == ourdl.sdl_alen) &&
230 !bcmp(LLADDR(sdl),
231 LLADDR(&ourdl),
232 sdl->sdl_alen)) {
233 IFNET_RUNLOCK();
234 CURVNET_RESTORE();
235 goto match_done;
236 }
237 }
238 }
239 }
240 IFNET_RUNLOCK();
241 CURVNET_RESTORE();
242 if (time_uptime < timeout_at) {
243 pause("nfssdl", hz / 5);
244 goto retry;
245 }
246 printf("nfs_diskless: no interface\n");
247 return; /* no matching interface */
248 match_done:
249 kern_setenv("boot.netif.name", ifp->if_xname);
250 if (is_nfsv3 != 0) {
251 strlcpy(nd3->myif.ifra_name, ifp->if_xname,
252 sizeof(nd3->myif.ifra_name));
253
254 /* set up gateway */
255 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
256
257 /* set up root mount */
258 nd3->root_args.rsize = 32768; /* XXX tunable? */
259 nd3->root_args.wsize = 32768;
260 nd3->root_args.sotype = SOCK_STREAM;
261 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
262 NFSMNT_RSIZE | NFSMNT_RESVPORT);
263 if (inaddr_to_sockaddr("boot.nfsroot.server",
264 &nd3->root_saddr)) {
265 printf("nfs_diskless: no server\n");
266 return;
267 }
268 nd3->root_saddr.sin_port = htons(NFS_PORT);
269 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
270 &nd3->root_fh[0], NFSX_V3FHMAX);
271 if (fhlen == 0) {
272 printf("nfs_diskless: no NFS handle\n");
273 return;
274 }
275 if (fhlen != nd3->root_fhsize) {
276 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
277 return;
278 }
279 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
280 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
281 freeenv(cp);
282 }
283 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
284 nfs_parse_options(cp, &nd3->root_args);
285 freeenv(cp);
286 }
287
288 nfs_diskless_valid = 3;
289 } else {
290 strlcpy(nd->myif.ifra_name, ifp->if_xname,
291 sizeof(nd->myif.ifra_name));
292
293 /* set up gateway */
294 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
295
296 /* set up root mount */
297 nd->root_args.rsize = 8192; /* XXX tunable? */
298 nd->root_args.wsize = 8192;
299 nd->root_args.sotype = SOCK_STREAM;
300 nd->root_args.flags = (NFSMNT_WSIZE |
301 NFSMNT_RSIZE | NFSMNT_RESVPORT);
302 if (inaddr_to_sockaddr("boot.nfsroot.server",
303 &nd->root_saddr)) {
304 printf("nfs_diskless: no server\n");
305 return;
306 }
307 nd->root_saddr.sin_port = htons(NFS_PORT);
308 if (decode_nfshandle("boot.nfsroot.nfshandle",
309 &nd->root_fh[0], NFSX_V2FH) == 0) {
310 printf("nfs_diskless: no NFS handle\n");
311 return;
312 }
313 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
314 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
315 freeenv(cp);
316 }
317 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
318 struct nfs_args args;
319
320 /*
321 * XXX yech, convert between old and current
322 * arg format
323 */
324 args.flags = nd->root_args.flags;
325 args.sotype = nd->root_args.sotype;
326 args.rsize = nd->root_args.rsize;
327 args.wsize = nd->root_args.wsize;
328 nfs_parse_options(cp, &args);
329 nd->root_args.flags = args.flags;
330 nd->root_args.sotype = args.sotype;
331 nd->root_args.rsize = args.rsize;
332 nd->root_args.wsize = args.wsize;
333 freeenv(cp);
334 }
335
336 nfs_diskless_valid = 1;
337 }
338 }
339
340 static int
inaddr_to_sockaddr(char * ev,struct sockaddr_in * sa)341 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
342 {
343 u_int32_t a[4];
344 char *cp;
345 int count;
346
347 bzero(sa, sizeof(*sa));
348 sa->sin_len = sizeof(*sa);
349 sa->sin_family = AF_INET;
350
351 if ((cp = kern_getenv(ev)) == NULL)
352 return (1);
353 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
354 freeenv(cp);
355 if (count != 4)
356 return (1);
357 sa->sin_addr.s_addr =
358 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
359 return (0);
360 }
361
362 static int
hwaddr_to_sockaddr(char * ev,struct sockaddr_dl * sa)363 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
364 {
365 char *cp;
366 u_int32_t a[6];
367 int count;
368
369 bzero(sa, sizeof(*sa));
370 sa->sdl_len = sizeof(*sa);
371 sa->sdl_family = AF_LINK;
372 sa->sdl_type = IFT_ETHER;
373 sa->sdl_alen = ETHER_ADDR_LEN;
374 if ((cp = kern_getenv(ev)) == NULL)
375 return (1);
376 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
377 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
378 freeenv(cp);
379 if (count != 6)
380 return (1);
381 sa->sdl_data[0] = a[0];
382 sa->sdl_data[1] = a[1];
383 sa->sdl_data[2] = a[2];
384 sa->sdl_data[3] = a[3];
385 sa->sdl_data[4] = a[4];
386 sa->sdl_data[5] = a[5];
387 return (0);
388 }
389
390 static int
decode_nfshandle(char * ev,u_char * fh,int maxfh)391 decode_nfshandle(char *ev, u_char *fh, int maxfh)
392 {
393 u_char *cp, *ep;
394 int len, val;
395
396 ep = cp = kern_getenv(ev);
397 if (cp == NULL)
398 return (0);
399 if ((strlen(cp) < 2) || (*cp != 'X')) {
400 freeenv(ep);
401 return (0);
402 }
403 len = 0;
404 cp++;
405 for (;;) {
406 if (*cp == 'X') {
407 freeenv(ep);
408 return (len);
409 }
410 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
411 freeenv(ep);
412 return (0);
413 }
414 *(fh++) = val;
415 len++;
416 cp += 2;
417 if (len > maxfh) {
418 freeenv(ep);
419 return (0);
420 }
421 }
422 }
423
424 #if !defined(BOOTP_NFSROOT)
425 static void
nfs_rootconf(void)426 nfs_rootconf(void)
427 {
428
429 nfs_setup_diskless();
430 if (nfs_diskless_valid)
431 rootdevnames[0] = "nfs:";
432 }
433
434 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
435 #endif
436
437