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: src/sys/nfsclient/nfs_diskless.c,v 1.22 2008/10/02 15:37:58 zec Exp $");
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 #include <sys/vimage.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 <netinet/in.h>
54 #include <rpc/rpcclnt.h>
55 #include <nfs/rpcv2.h>
56 #include <nfs/nfsproto.h>
57 #include <nfsclient/nfs.h>
58 #include <nfsclient/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);
63
64 /*
65 * Validate/sanity check a rsize/wsize parameter.
66 */
67 static int
68 checkrwsize(unsigned long v, const char *name)
69 {
70 /*
71 * 32K is used as an upper bound because most servers
72 * limit block size to satisfy IPv4's limit of
73 * 64K/reassembled packet. The lower bound is pretty
74 * much arbitrary.
75 */
76 if (!(4 <= v && v <= 32*1024)) {
77 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
78 return 0;
79 } else
80 return 1;
81 }
82
83 /*
84 * Parse mount options and apply them to the supplied
85 * nfs_diskless state. Used also by bootp/dhcp support.
86 */
87 void
88 nfs_parse_options(const char *envopts, struct nfs_args *nd)
89 {
90 char *opts, *o, *otmp;
91 unsigned long v;
92
93 opts = strdup(envopts, M_TEMP);
94 otmp = opts;
95 while ((o = strsep(&otmp, ":;, ")) != NULL) {
96 if (*o == '\0')
97 ; /* Skip empty options. */
98 else if (strcmp(o, "soft") == 0)
99 nd->flags |= NFSMNT_SOFT;
100 else if (strcmp(o, "intr") == 0)
101 nd->flags |= NFSMNT_INT;
102 else if (strcmp(o, "conn") == 0)
103 nd->flags |= NFSMNT_NOCONN;
104 else if (strcmp(o, "nolockd") == 0)
105 nd->flags |= NFSMNT_NOLOCKD;
106 else if (strcmp(o, "nfsv2") == 0)
107 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
108 else if (strcmp(o, "nfsv3") == 0) {
109 nd->flags &= ~NFSMNT_NFSV4;
110 nd->flags |= NFSMNT_NFSV3;
111 } else if (strcmp(o, "tcp") == 0)
112 nd->sotype = SOCK_STREAM;
113 else if (strcmp(o, "udp") == 0)
114 nd->sotype = SOCK_DGRAM;
115 else if (strncmp(o, "rsize=", 6) == 0) {
116 v = strtoul(o+6, NULL, 10);
117 if (checkrwsize(v, "rsize")) {
118 nd->rsize = (int) v;
119 nd->flags |= NFSMNT_RSIZE;
120 }
121 } else if (strncmp(o, "wsize=", 6) == 0) {
122 v = strtoul(o+6, NULL, 10);
123 if (checkrwsize(v, "wsize")) {
124 nd->wsize = (int) v;
125 nd->flags |= NFSMNT_WSIZE;
126 }
127 } else
128 printf("%s: skipping unknown option \"%s\"\n",
129 __func__, o);
130 }
131 free(opts, M_TEMP);
132 }
133
134 /*
135 * Populate the essential fields in the nfsv3_diskless structure.
136 *
137 * The loader is expected to export the following environment variables:
138 *
139 * boot.netif.name name of boot interface
140 * boot.netif.ip IP address on boot interface
141 * boot.netif.netmask netmask on boot interface
142 * boot.netif.gateway default gateway (optional)
143 * boot.netif.hwaddr hardware address of boot interface
144 * boot.nfsroot.server IP address of root filesystem server
145 * boot.nfsroot.path path of the root filesystem on server
146 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
147 * boot.nfsroot.options NFS options for the root filesystem
148 */
149 void
150 nfs_setup_diskless(void)
151 {
152 INIT_VNET_NET(curvnet);
153 struct nfs_diskless *nd = &nfs_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
160 if (nfs_diskless_valid)
161 return;
162 /* set up interface */
163 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
164 return;
165 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
166 printf("nfs_diskless: no netmask\n");
167 return;
168 }
169 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
170 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
171 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
172 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
173 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
174
175 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
176 printf("nfs_diskless: no hardware address\n");
177 return;
178 }
179 ifa = NULL;
180 IFNET_RLOCK();
181 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
182 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
183 if (ifa->ifa_addr->sa_family == AF_LINK) {
184 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
185 if ((sdl->sdl_type == ourdl.sdl_type) &&
186 (sdl->sdl_alen == ourdl.sdl_alen) &&
187 !bcmp(LLADDR(sdl),
188 LLADDR(&ourdl),
189 sdl->sdl_alen)) {
190 IFNET_RUNLOCK();
191 goto match_done;
192 }
193 }
194 }
195 }
196 IFNET_RUNLOCK();
197 printf("nfs_diskless: no interface\n");
198 return; /* no matching interface */
199 match_done:
200 setenv("boot.netif.name", ifp->if_xname);
201 strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
202
203 /* set up gateway */
204 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
205
206 /* set up root mount */
207 nd->root_args.rsize = 8192; /* XXX tunable? */
208 nd->root_args.wsize = 8192;
209 nd->root_args.sotype = SOCK_STREAM;
210 nd->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
211 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
212 printf("nfs_diskless: no server\n");
213 return;
214 }
215 nd->root_saddr.sin_port = htons(NFS_PORT);
216 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
217 printf("nfs_diskless: no NFS handle\n");
218 return;
219 }
220 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
221 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
222 freeenv(cp);
223 }
224 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
225 struct nfs_args args;
226
227 /* XXX yech, convert between old and current arg format */
228 args.flags = nd->root_args.flags;
229 args.sotype = nd->root_args.sotype;
230 args.rsize = nd->root_args.rsize;
231 args.wsize = nd->root_args.wsize;
232 nfs_parse_options(cp, &args);
233 nd->root_args.flags = args.flags;
234 nd->root_args.sotype = args.sotype;
235 nd->root_args.rsize = args.rsize;
236 nd->root_args.wsize = args.wsize;
237 freeenv(cp);
238 }
239
240 nfs_diskless_valid = 1;
241 }
242
243 static int
244 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
245 {
246 u_int32_t a[4];
247 char *cp;
248 int count;
249
250 bzero(sa, sizeof(*sa));
251 sa->sin_len = sizeof(*sa);
252 sa->sin_family = AF_INET;
253
254 if ((cp = getenv(ev)) == NULL)
255 return (1);
256 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
257 freeenv(cp);
258 if (count != 4)
259 return (1);
260 sa->sin_addr.s_addr =
261 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
262 return (0);
263 }
264
265 static int
266 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
267 {
268 char *cp;
269 u_int32_t a[6];
270 int count;
271
272 bzero(sa, sizeof(*sa));
273 sa->sdl_len = sizeof(*sa);
274 sa->sdl_family = AF_LINK;
275 sa->sdl_type = IFT_ETHER;
276 sa->sdl_alen = ETHER_ADDR_LEN;
277 if ((cp = getenv(ev)) == NULL)
278 return (1);
279 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
280 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
281 freeenv(cp);
282 if (count != 6)
283 return (1);
284 sa->sdl_data[0] = a[0];
285 sa->sdl_data[1] = a[1];
286 sa->sdl_data[2] = a[2];
287 sa->sdl_data[3] = a[3];
288 sa->sdl_data[4] = a[4];
289 sa->sdl_data[5] = a[5];
290 return (0);
291 }
292
293 static int
294 decode_nfshandle(char *ev, u_char *fh)
295 {
296 u_char *cp, *ep;
297 int len, val;
298
299 ep = cp = getenv(ev);
300 if (cp == NULL)
301 return (0);
302 if ((strlen(cp) < 2) || (*cp != 'X')) {
303 freeenv(ep);
304 return (0);
305 }
306 len = 0;
307 cp++;
308 for (;;) {
309 if (*cp == 'X') {
310 freeenv(ep);
311 return (len);
312 }
313 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
314 freeenv(ep);
315 return (0);
316 }
317 *(fh++) = val;
318 len++;
319 cp += 2;
320 if (len > NFSX_V2FH) {
321 freeenv(ep);
322 return (0);
323 }
324 }
325 }
326
327 #if !defined(BOOTP_NFSROOT)
328 static void
329 nfs_rootconf(void)
330 {
331
332 nfs_setup_diskless();
333 if (nfs_diskless_valid)
334 rootdevnames[0] = "nfs:";
335 }
336
337 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
338 #endif
339
340
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