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/8.1/sys/nfsclient/nfs_diskless.c 199583 2009-11-20 15:27:52Z jhb $");
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);
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.options NFS options for the root filesystem
147 */
148 void
149 nfs_setup_diskless(void)
150 {
151 struct nfs_diskless *nd = &nfs_diskless;
152 struct ifnet *ifp;
153 struct ifaddr *ifa;
154 struct sockaddr_dl *sdl, ourdl;
155 struct sockaddr_in myaddr, netmask;
156 char *cp;
157
158 if (nfs_diskless_valid)
159 return;
160 /* set up interface */
161 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
162 return;
163 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
164 printf("nfs_diskless: no netmask\n");
165 return;
166 }
167 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
168 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
169 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
170 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
171 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
172
173 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
174 printf("nfs_diskless: no hardware address\n");
175 return;
176 }
177 ifa = NULL;
178 IFNET_RLOCK();
179 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
180 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
181 if (ifa->ifa_addr->sa_family == AF_LINK) {
182 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
183 if ((sdl->sdl_type == ourdl.sdl_type) &&
184 (sdl->sdl_alen == ourdl.sdl_alen) &&
185 !bcmp(LLADDR(sdl),
186 LLADDR(&ourdl),
187 sdl->sdl_alen)) {
188 IFNET_RUNLOCK();
189 goto match_done;
190 }
191 }
192 }
193 }
194 IFNET_RUNLOCK();
195 printf("nfs_diskless: no interface\n");
196 return; /* no matching interface */
197 match_done:
198 setenv("boot.netif.name", ifp->if_xname);
199 strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
200
201 /* set up gateway */
202 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
203
204 /* set up root mount */
205 nd->root_args.rsize = 8192; /* XXX tunable? */
206 nd->root_args.wsize = 8192;
207 nd->root_args.sotype = SOCK_STREAM;
208 nd->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
209 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
210 printf("nfs_diskless: no server\n");
211 return;
212 }
213 nd->root_saddr.sin_port = htons(NFS_PORT);
214 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
215 printf("nfs_diskless: no NFS handle\n");
216 return;
217 }
218 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
219 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
220 freeenv(cp);
221 }
222 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
223 struct nfs_args args;
224
225 /* XXX yech, convert between old and current arg format */
226 args.flags = nd->root_args.flags;
227 args.sotype = nd->root_args.sotype;
228 args.rsize = nd->root_args.rsize;
229 args.wsize = nd->root_args.wsize;
230 nfs_parse_options(cp, &args);
231 nd->root_args.flags = args.flags;
232 nd->root_args.sotype = args.sotype;
233 nd->root_args.rsize = args.rsize;
234 nd->root_args.wsize = args.wsize;
235 freeenv(cp);
236 }
237
238 nfs_diskless_valid = 1;
239 }
240
241 static int
242 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
243 {
244 u_int32_t a[4];
245 char *cp;
246 int count;
247
248 bzero(sa, sizeof(*sa));
249 sa->sin_len = sizeof(*sa);
250 sa->sin_family = AF_INET;
251
252 if ((cp = getenv(ev)) == NULL)
253 return (1);
254 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
255 freeenv(cp);
256 if (count != 4)
257 return (1);
258 sa->sin_addr.s_addr =
259 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
260 return (0);
261 }
262
263 static int
264 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
265 {
266 char *cp;
267 u_int32_t a[6];
268 int count;
269
270 bzero(sa, sizeof(*sa));
271 sa->sdl_len = sizeof(*sa);
272 sa->sdl_family = AF_LINK;
273 sa->sdl_type = IFT_ETHER;
274 sa->sdl_alen = ETHER_ADDR_LEN;
275 if ((cp = getenv(ev)) == NULL)
276 return (1);
277 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
278 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
279 freeenv(cp);
280 if (count != 6)
281 return (1);
282 sa->sdl_data[0] = a[0];
283 sa->sdl_data[1] = a[1];
284 sa->sdl_data[2] = a[2];
285 sa->sdl_data[3] = a[3];
286 sa->sdl_data[4] = a[4];
287 sa->sdl_data[5] = a[5];
288 return (0);
289 }
290
291 static int
292 decode_nfshandle(char *ev, u_char *fh)
293 {
294 u_char *cp, *ep;
295 int len, val;
296
297 ep = cp = getenv(ev);
298 if (cp == NULL)
299 return (0);
300 if ((strlen(cp) < 2) || (*cp != 'X')) {
301 freeenv(ep);
302 return (0);
303 }
304 len = 0;
305 cp++;
306 for (;;) {
307 if (*cp == 'X') {
308 freeenv(ep);
309 return (len);
310 }
311 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
312 freeenv(ep);
313 return (0);
314 }
315 *(fh++) = val;
316 len++;
317 cp += 2;
318 if (len > NFSX_V2FH) {
319 freeenv(ep);
320 return (0);
321 }
322 }
323 }
324
325 #if !defined(BOOTP_NFSROOT)
326 static void
327 nfs_rootconf(void)
328 {
329
330 nfs_setup_diskless();
331 if (nfs_diskless_valid)
332 rootdevnames[0] = "nfs:";
333 }
334
335 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
336 #endif
337
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