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/6.2/sys/nfsclient/nfs_diskless.c 156909 2006-03-20 15:45:14Z pjd $");
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
46 #include <sys/socket.h>
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 <netinet/in.h>
53 #include <rpc/rpcclnt.h>
54 #include <nfs/rpcv2.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 static void
64 nfs_parse_options(const char *envopts, struct nfs_diskless *nd)
65 {
66 char *opts, *o, *otmp;
67
68 opts = strdup(envopts, M_TEMP);
69 otmp = opts;
70 while ((o = strsep(&otmp, ":;, ")) != NULL) {
71 if (*o == '\0')
72 ; /* Skip empty options. */
73 else if (strcmp(o, "soft") == 0)
74 nd->root_args.flags |= NFSMNT_SOFT;
75 else if (strcmp(o, "intr") == 0)
76 nd->root_args.flags |= NFSMNT_INT;
77 else if (strcmp(o, "conn") == 0)
78 nd->root_args.flags |= NFSMNT_NOCONN;
79 else if (strcmp(o, "nolockd") == 0)
80 nd->root_args.flags |= NFSMNT_NOLOCKD;
81 else
82 printf("nfs_diskless: unknown option: %s\n", o);
83 }
84 free(opts, M_TEMP);
85 }
86
87 /*
88 * Populate the essential fields in the nfsv3_diskless structure.
89 *
90 * The loader is expected to export the following environment variables:
91 *
92 * boot.netif.name name of boot interface
93 * boot.netif.ip IP address on boot interface
94 * boot.netif.netmask netmask on boot interface
95 * boot.netif.gateway default gateway (optional)
96 * boot.netif.hwaddr hardware address of boot interface
97 * boot.nfsroot.server IP address of root filesystem server
98 * boot.nfsroot.path path of the root filesystem on server
99 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
100 * boot.nfsroot.options NFS options for the root filesystem
101 */
102 void
103 nfs_setup_diskless(void)
104 {
105 struct nfs_diskless *nd = &nfs_diskless;
106 struct ifnet *ifp;
107 struct ifaddr *ifa;
108 struct sockaddr_dl *sdl, ourdl;
109 struct sockaddr_in myaddr, netmask;
110 char *cp;
111
112 if (nfs_diskless_valid)
113 return;
114 /* set up interface */
115 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
116 return;
117 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
118 printf("nfs_diskless: no netmask\n");
119 return;
120 }
121 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
122 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
123 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
124 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
125 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
126
127 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
128 printf("nfs_diskless: no hardware address\n");
129 return;
130 }
131 ifa = NULL;
132 IFNET_RLOCK();
133 TAILQ_FOREACH(ifp, &ifnet, if_link) {
134 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
135 if ((ifa->ifa_addr->sa_family == AF_LINK) &&
136 (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
137 if ((sdl->sdl_type == ourdl.sdl_type) &&
138 (sdl->sdl_alen == ourdl.sdl_alen) &&
139 !bcmp(sdl->sdl_data + sdl->sdl_nlen,
140 ourdl.sdl_data + ourdl.sdl_nlen,
141 sdl->sdl_alen)) {
142 IFNET_RUNLOCK();
143 goto match_done;
144 }
145 }
146 }
147 }
148 IFNET_RUNLOCK();
149 printf("nfs_diskless: no interface\n");
150 return; /* no matching interface */
151 match_done:
152 setenv("boot.netif.name", ifp->if_xname);
153 strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
154
155 /* set up gateway */
156 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
157
158 /* set up root mount */
159 nd->root_args.rsize = 8192; /* XXX tunable? */
160 nd->root_args.wsize = 8192;
161 nd->root_args.sotype = SOCK_DGRAM;
162 nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
163 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
164 printf("nfs_diskless: no server\n");
165 return;
166 }
167 nd->root_saddr.sin_port = htons(NFS_PORT);
168 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
169 printf("nfs_diskless: no NFS handle\n");
170 return;
171 }
172 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
173 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
174 freeenv(cp);
175 }
176 if ((cp = getenv("boot.nfsroot.options")) != NULL) {
177 nfs_parse_options(cp, nd);
178 freeenv(cp);
179 }
180
181 nfs_diskless_valid = 1;
182 }
183
184 static int
185 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
186 {
187 u_int32_t a[4];
188 char *cp;
189 int count;
190
191 bzero(sa, sizeof(*sa));
192 sa->sin_len = sizeof(*sa);
193 sa->sin_family = AF_INET;
194
195 if ((cp = getenv(ev)) == NULL)
196 return (1);
197 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
198 freeenv(cp);
199 if (count != 4)
200 return (1);
201 sa->sin_addr.s_addr =
202 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
203 return (0);
204 }
205
206 static int
207 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
208 {
209 char *cp;
210 u_int32_t a[6];
211 int count;
212
213 bzero(sa, sizeof(*sa));
214 sa->sdl_len = sizeof(*sa);
215 sa->sdl_family = AF_LINK;
216 sa->sdl_type = IFT_ETHER;
217 sa->sdl_alen = ETHER_ADDR_LEN;
218 if ((cp = getenv(ev)) == NULL)
219 return (1);
220 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
221 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
222 freeenv(cp);
223 if (count != 6)
224 return (1);
225 sa->sdl_data[0] = a[0];
226 sa->sdl_data[1] = a[1];
227 sa->sdl_data[2] = a[2];
228 sa->sdl_data[3] = a[3];
229 sa->sdl_data[4] = a[4];
230 sa->sdl_data[5] = a[5];
231 return (0);
232 }
233
234 static int
235 decode_nfshandle(char *ev, u_char *fh)
236 {
237 u_char *cp, *ep;
238 int len, val;
239
240 ep = cp = getenv(ev);
241 if (cp == NULL)
242 return (0);
243 if ((strlen(cp) < 2) || (*cp != 'X')) {
244 freeenv(ep);
245 return (0);
246 }
247 len = 0;
248 cp++;
249 for (;;) {
250 if (*cp == 'X') {
251 freeenv(ep);
252 return (len);
253 }
254 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
255 freeenv(ep);
256 return (0);
257 }
258 *(fh++) = val;
259 len++;
260 cp += 2;
261 if (len > NFSX_V2FH) {
262 freeenv(ep);
263 return (0);
264 }
265 }
266 }
267
268 #if !defined(BOOTP_NFSROOT)
269 static void
270 nfs_rootconf(void)
271 {
272
273 nfs_setup_diskless();
274 if (nfs_diskless_valid)
275 rootdevnames[0] = "nfs:";
276 }
277
278 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL)
279 #endif
280
Cache object: 19843fca57d3ad7a0a0c9a20bb3e67c5
|