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/5.3/sys/nfsclient/nfs_diskless.c 132808 2004-07-28 21:54:57Z phk $");
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/mount.h>
43
44 #include <sys/socket.h>
45 #include <net/if.h>
46 #include <net/if_dl.h>
47 #include <net/if_types.h>
48 #include <net/if_var.h>
49 #include <net/ethernet.h>
50 #include <netinet/in.h>
51 #include <rpc/rpcclnt.h>
52 #include <nfs/rpcv2.h>
53 #include <nfs/nfsproto.h>
54 #include <nfsclient/nfs.h>
55 #include <nfsclient/nfsdiskless.h>
56
57 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
58 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
59 static int decode_nfshandle(char *ev, u_char *fh);
60
61 /*
62 * Populate the essential fields in the nfsv3_diskless structure.
63 *
64 * The loader is expected to export the following environment variables:
65 *
66 * boot.netif.ip IP address on boot interface
67 * boot.netif.netmask netmask on boot interface
68 * boot.netif.gateway default gateway (optional)
69 * boot.netif.hwaddr hardware address of boot interface
70 * boot.nfsroot.server IP address of root filesystem server
71 * boot.nfsroot.path path of the root filesystem on server
72 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
73 */
74 void
75 nfs_setup_diskless(void)
76 {
77 struct nfs_diskless *nd = &nfs_diskless;
78 struct ifnet *ifp;
79 struct ifaddr *ifa;
80 struct sockaddr_dl *sdl, ourdl;
81 struct sockaddr_in myaddr, netmask;
82 char *cp;
83
84 if (nfs_diskless_valid)
85 return;
86 /* set up interface */
87 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
88 return;
89 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
90 printf("nfs_diskless: no netmask\n");
91 return;
92 }
93 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
94 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
95 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
96 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
97 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
98
99 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
100 printf("nfs_diskless: no hardware address\n");
101 return;
102 }
103 ifa = NULL;
104 IFNET_RLOCK();
105 TAILQ_FOREACH(ifp, &ifnet, if_link) {
106 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
107 if ((ifa->ifa_addr->sa_family == AF_LINK) &&
108 (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
109 if ((sdl->sdl_type == ourdl.sdl_type) &&
110 (sdl->sdl_alen == ourdl.sdl_alen) &&
111 !bcmp(sdl->sdl_data + sdl->sdl_nlen,
112 ourdl.sdl_data + ourdl.sdl_nlen,
113 sdl->sdl_alen)) {
114 IFNET_RUNLOCK();
115 goto match_done;
116 }
117 }
118 }
119 }
120 IFNET_RUNLOCK();
121 printf("nfs_diskless: no interface\n");
122 return; /* no matching interface */
123 match_done:
124 strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
125
126 /* set up gateway */
127 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
128
129 /* set up root mount */
130 nd->root_args.rsize = 8192; /* XXX tunable? */
131 nd->root_args.wsize = 8192;
132 nd->root_args.sotype = SOCK_DGRAM;
133 nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
134 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
135 printf("nfs_diskless: no server\n");
136 return;
137 }
138 nd->root_saddr.sin_port = htons(NFS_PORT);
139 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
140 printf("nfs_diskless: no NFS handle\n");
141 return;
142 }
143 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
144 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
145 freeenv(cp);
146 }
147
148 nfs_diskless_valid = 1;
149 }
150
151 static int
152 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
153 {
154 u_int32_t a[4];
155 char *cp;
156 int count;
157
158 bzero(sa, sizeof(*sa));
159 sa->sin_len = sizeof(*sa);
160 sa->sin_family = AF_INET;
161
162 if ((cp = getenv(ev)) == NULL)
163 return (1);
164 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
165 freeenv(cp);
166 if (count != 4)
167 return (1);
168 sa->sin_addr.s_addr =
169 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
170 return (0);
171 }
172
173 static int
174 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
175 {
176 char *cp;
177 u_int32_t a[6];
178 int count;
179
180 bzero(sa, sizeof(*sa));
181 sa->sdl_len = sizeof(*sa);
182 sa->sdl_family = AF_LINK;
183 sa->sdl_type = IFT_ETHER;
184 sa->sdl_alen = ETHER_ADDR_LEN;
185 if ((cp = getenv(ev)) == NULL)
186 return (1);
187 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
188 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
189 freeenv(cp);
190 if (count != 6)
191 return (1);
192 sa->sdl_data[0] = a[0];
193 sa->sdl_data[1] = a[1];
194 sa->sdl_data[2] = a[2];
195 sa->sdl_data[3] = a[3];
196 sa->sdl_data[4] = a[4];
197 sa->sdl_data[5] = a[5];
198 return (0);
199 }
200
201 static int
202 decode_nfshandle(char *ev, u_char *fh)
203 {
204 u_char *cp, *ep;
205 int len, val;
206
207 ep = cp = getenv(ev);
208 if (cp == NULL)
209 return (0);
210 if ((strlen(cp) < 2) || (*cp != 'X')) {
211 freeenv(ep);
212 return (0);
213 }
214 len = 0;
215 cp++;
216 for (;;) {
217 if (*cp == 'X') {
218 freeenv(ep);
219 return (len);
220 }
221 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
222 freeenv(ep);
223 return (0);
224 }
225 *(fh++) = val;
226 len++;
227 cp += 2;
228 if (len > NFSX_V2FH) {
229 freeenv(ep);
230 return (0);
231 }
232 }
233 }
234
235 #if !defined(BOOTP_NFSROOT)
236 static void
237 nfs_rootconf(void)
238 {
239
240 nfs_setup_diskless();
241 if (nfs_diskless_valid)
242 rootdevnames[0] = "nfs:";
243 }
244
245 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL)
246 #endif
247
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