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/6.0/sys/nfsclient/nfs_diskless.c 145572 2005-04-26 20:47:59Z des $");
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 /*
64 * Populate the essential fields in the nfsv3_diskless structure.
65 *
66 * The loader is expected to export the following environment variables:
67 *
68 * boot.netif.name name of boot interface
69 * boot.netif.ip IP address on boot interface
70 * boot.netif.netmask netmask on boot interface
71 * boot.netif.gateway default gateway (optional)
72 * boot.netif.hwaddr hardware address of boot interface
73 * boot.nfsroot.server IP address of root filesystem server
74 * boot.nfsroot.path path of the root filesystem on server
75 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
76 */
77 void
78 nfs_setup_diskless(void)
79 {
80 struct nfs_diskless *nd = &nfs_diskless;
81 struct ifnet *ifp;
82 struct ifaddr *ifa;
83 struct sockaddr_dl *sdl, ourdl;
84 struct sockaddr_in myaddr, netmask;
85 char *cp;
86
87 if (nfs_diskless_valid)
88 return;
89 /* set up interface */
90 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
91 return;
92 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
93 printf("nfs_diskless: no netmask\n");
94 return;
95 }
96 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
97 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
98 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
99 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
100 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
101
102 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
103 printf("nfs_diskless: no hardware address\n");
104 return;
105 }
106 ifa = NULL;
107 IFNET_RLOCK();
108 TAILQ_FOREACH(ifp, &ifnet, if_link) {
109 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
110 if ((ifa->ifa_addr->sa_family == AF_LINK) &&
111 (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
112 if ((sdl->sdl_type == ourdl.sdl_type) &&
113 (sdl->sdl_alen == ourdl.sdl_alen) &&
114 !bcmp(sdl->sdl_data + sdl->sdl_nlen,
115 ourdl.sdl_data + ourdl.sdl_nlen,
116 sdl->sdl_alen)) {
117 IFNET_RUNLOCK();
118 goto match_done;
119 }
120 }
121 }
122 }
123 IFNET_RUNLOCK();
124 printf("nfs_diskless: no interface\n");
125 return; /* no matching interface */
126 match_done:
127 setenv("boot.netif.name", ifp->if_xname);
128 strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
129
130 /* set up gateway */
131 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
132
133 /* set up root mount */
134 nd->root_args.rsize = 8192; /* XXX tunable? */
135 nd->root_args.wsize = 8192;
136 nd->root_args.sotype = SOCK_DGRAM;
137 nd->root_args.flags = (NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
138 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
139 printf("nfs_diskless: no server\n");
140 return;
141 }
142 nd->root_saddr.sin_port = htons(NFS_PORT);
143 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
144 printf("nfs_diskless: no NFS handle\n");
145 return;
146 }
147 if ((cp = getenv("boot.nfsroot.path")) != NULL) {
148 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
149 freeenv(cp);
150 }
151
152 nfs_diskless_valid = 1;
153 }
154
155 static int
156 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
157 {
158 u_int32_t a[4];
159 char *cp;
160 int count;
161
162 bzero(sa, sizeof(*sa));
163 sa->sin_len = sizeof(*sa);
164 sa->sin_family = AF_INET;
165
166 if ((cp = getenv(ev)) == NULL)
167 return (1);
168 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
169 freeenv(cp);
170 if (count != 4)
171 return (1);
172 sa->sin_addr.s_addr =
173 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
174 return (0);
175 }
176
177 static int
178 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
179 {
180 char *cp;
181 u_int32_t a[6];
182 int count;
183
184 bzero(sa, sizeof(*sa));
185 sa->sdl_len = sizeof(*sa);
186 sa->sdl_family = AF_LINK;
187 sa->sdl_type = IFT_ETHER;
188 sa->sdl_alen = ETHER_ADDR_LEN;
189 if ((cp = getenv(ev)) == NULL)
190 return (1);
191 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
192 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
193 freeenv(cp);
194 if (count != 6)
195 return (1);
196 sa->sdl_data[0] = a[0];
197 sa->sdl_data[1] = a[1];
198 sa->sdl_data[2] = a[2];
199 sa->sdl_data[3] = a[3];
200 sa->sdl_data[4] = a[4];
201 sa->sdl_data[5] = a[5];
202 return (0);
203 }
204
205 static int
206 decode_nfshandle(char *ev, u_char *fh)
207 {
208 u_char *cp, *ep;
209 int len, val;
210
211 ep = cp = getenv(ev);
212 if (cp == NULL)
213 return (0);
214 if ((strlen(cp) < 2) || (*cp != 'X')) {
215 freeenv(ep);
216 return (0);
217 }
218 len = 0;
219 cp++;
220 for (;;) {
221 if (*cp == 'X') {
222 freeenv(ep);
223 return (len);
224 }
225 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
226 freeenv(ep);
227 return (0);
228 }
229 *(fh++) = val;
230 len++;
231 cp += 2;
232 if (len > NFSX_V2FH) {
233 freeenv(ep);
234 return (0);
235 }
236 }
237 }
238
239 #if !defined(BOOTP_NFSROOT)
240 static void
241 nfs_rootconf(void)
242 {
243
244 nfs_setup_diskless();
245 if (nfs_diskless_valid)
246 rootdevnames[0] = "nfs:";
247 }
248
249 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL)
250 #endif
251
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