2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include "opt_bootp.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/socket.h>
51 #include <net/if_dl.h>
52 #include <net/if_types.h>
53 #include <net/if_var.h>
54 #include <net/ethernet.h>
57 #include <netinet/in.h>
58 #include <nfs/nfsproto.h>
59 #include <nfsclient/nfs.h>
60 #include <nfs/nfsdiskless.h>
62 #define NFS_IFACE_TIMEOUT_SECS 10 /* Timeout for interface to appear. */
64 static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
65 static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
66 static int decode_nfshandle(char *ev, u_char *fh, int maxfh);
69 * This structure must be filled in by a primary bootstrap or bootstrap
70 * server for a diskless/dataless machine. It is initialized below just
71 * to ensure that it is allocated to initialized data (.data not .bss).
73 struct nfs_diskless nfs_diskless = { { { 0 } } };
74 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
75 int nfs_diskless_valid = 0;
78 * Validate/sanity check a rsize/wsize parameter.
81 checkrwsize(unsigned long v, const char *name)
84 * 32K is used as an upper bound because most servers
85 * limit block size to satisfy IPv4's limit of
86 * 64K/reassembled packet. The lower bound is pretty
89 if (!(4 <= v && v <= 32*1024)) {
90 printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
97 * Parse mount options and apply them to the supplied
98 * nfs_diskless state. Used also by bootp/dhcp support.
101 nfs_parse_options(const char *envopts, struct nfs_args *nd)
103 char *opts, *o, *otmp;
106 opts = strdup(envopts, M_TEMP);
108 while ((o = strsep(&otmp, ":;, ")) != NULL) {
110 ; /* Skip empty options. */
111 else if (strcmp(o, "soft") == 0)
112 nd->flags |= NFSMNT_SOFT;
113 else if (strcmp(o, "intr") == 0)
114 nd->flags |= NFSMNT_INT;
115 else if (strcmp(o, "conn") == 0)
116 nd->flags |= NFSMNT_NOCONN;
117 else if (strcmp(o, "nolockd") == 0)
118 nd->flags |= NFSMNT_NOLOCKD;
119 else if (strcmp(o, "nocto") == 0)
120 nd->flags |= NFSMNT_NOCTO;
121 else if (strcmp(o, "nfsv2") == 0)
122 nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
123 else if (strcmp(o, "nfsv3") == 0) {
124 nd->flags &= ~NFSMNT_NFSV4;
125 nd->flags |= NFSMNT_NFSV3;
126 } else if (strcmp(o, "tcp") == 0)
127 nd->sotype = SOCK_STREAM;
128 else if (strcmp(o, "udp") == 0)
129 nd->sotype = SOCK_DGRAM;
130 else if (strncmp(o, "rsize=", 6) == 0) {
131 v = strtoul(o+6, NULL, 10);
132 if (checkrwsize(v, "rsize")) {
134 nd->flags |= NFSMNT_RSIZE;
136 } else if (strncmp(o, "wsize=", 6) == 0) {
137 v = strtoul(o+6, NULL, 10);
138 if (checkrwsize(v, "wsize")) {
140 nd->flags |= NFSMNT_WSIZE;
143 printf("%s: skipping unknown option \"%s\"\n",
150 nfs_setup_diskless_ifa_cb(void *arg, struct sockaddr_dl *sdl, u_int count)
152 struct sockaddr_dl *ourdl = arg;
154 if ((sdl->sdl_type == ourdl->sdl_type) &&
155 (sdl->sdl_alen == ourdl->sdl_alen) &&
156 !bcmp(LLADDR(sdl), LLADDR(ourdl), sdl->sdl_alen))
163 * Populate the essential fields in the nfsv3_diskless structure.
165 * The loader is expected to export the following environment variables:
167 * boot.netif.name name of boot interface
168 * boot.netif.ip IP address on boot interface
169 * boot.netif.netmask netmask on boot interface
170 * boot.netif.gateway default gateway (optional)
171 * boot.netif.hwaddr hardware address of boot interface
172 * boot.netif.mtu interface mtu from bootp/dhcp (optional)
173 * boot.nfsroot.server IP address of root filesystem server
174 * boot.nfsroot.path path of the root filesystem on server
175 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
176 * boot.nfsroot.nfshandlelen and length of this handle (for NFSv3 only)
177 * boot.nfsroot.options NFS options for the root filesystem
180 nfs_setup_diskless(void)
182 struct epoch_tracker et;
184 struct nfs_diskless *nd = &nfs_diskless;
185 struct nfsv3_diskless *nd3 = &nfsv3_diskless;
187 struct sockaddr_dl ourdl;
188 struct sockaddr_in myaddr, netmask;
190 int cnt, fhlen, is_nfsv3;
195 if (nfs_diskless_valid != 0)
198 /* get handle size. If this succeeds, it's an NFSv3 setup. */
199 if ((cp = kern_getenv("boot.nfsroot.nfshandlelen")) != NULL) {
200 cnt = sscanf(cp, "%d", &len);
202 if (cnt != 1 || len == 0 || len > NFSX_V3FHMAX) {
203 printf("nfs_diskless: bad NFS handle len\n");
206 nd3->root_fhsize = len;
210 /* set up interface */
211 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
213 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
214 printf("nfs_diskless: no netmask\n");
218 bcopy(&myaddr, &nd3->myif.ifra_addr, sizeof(myaddr));
219 bcopy(&myaddr, &nd3->myif.ifra_broadaddr, sizeof(myaddr));
220 ((struct sockaddr_in *)
221 &nd3->myif.ifra_broadaddr)->sin_addr.s_addr =
222 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
223 bcopy(&netmask, &nd3->myif.ifra_mask, sizeof(netmask));
225 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
226 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
227 ((struct sockaddr_in *)
228 &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
229 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
230 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
233 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
234 printf("nfs_diskless: no hardware address\n");
237 timeout_at = time_uptime + NFS_IFACE_TIMEOUT_SECS;
239 CURVNET_SET(TD_TO_VNET(curthread));
242 for (ifp = if_iter_start(&iter); ifp != NULL; ifp = if_iter_next(&iter)) {
243 count = if_foreach_lladdr(ifp, nfs_setup_diskless_ifa_cb, &ourdl);
249 if_iter_finish(&iter);
256 if (time_uptime < timeout_at) {
257 pause("nfssdl", hz / 5);
260 printf("nfs_diskless: no interface\n");
261 return; /* no matching interface */
263 kern_setenv("boot.netif.name", if_name(ifp));
265 strlcpy(nd3->myif.ifra_name, if_name(ifp),
266 sizeof(nd3->myif.ifra_name));
269 inaddr_to_sockaddr("boot.netif.gateway", &nd3->mygateway);
271 /* set up root mount */
272 nd3->root_args.rsize = 32768; /* XXX tunable? */
273 nd3->root_args.wsize = 32768;
274 nd3->root_args.sotype = SOCK_STREAM;
275 nd3->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE |
276 NFSMNT_RSIZE | NFSMNT_RESVPORT);
277 if (inaddr_to_sockaddr("boot.nfsroot.server",
279 printf("nfs_diskless: no server\n");
282 nd3->root_saddr.sin_port = htons(NFS_PORT);
283 fhlen = decode_nfshandle("boot.nfsroot.nfshandle",
284 &nd3->root_fh[0], NFSX_V3FHMAX);
286 printf("nfs_diskless: no NFS handle\n");
289 if (fhlen != nd3->root_fhsize) {
290 printf("nfs_diskless: bad NFS handle len=%d\n", fhlen);
293 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
294 strncpy(nd3->root_hostnam, cp, MNAMELEN - 1);
297 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
298 nfs_parse_options(cp, &nd3->root_args);
302 nfs_diskless_valid = 3;
304 strlcpy(nd->myif.ifra_name, if_name(ifp),
305 sizeof(nd->myif.ifra_name));
308 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
310 /* set up root mount */
311 nd->root_args.rsize = 8192; /* XXX tunable? */
312 nd->root_args.wsize = 8192;
313 nd->root_args.sotype = SOCK_STREAM;
314 nd->root_args.flags = (NFSMNT_WSIZE |
315 NFSMNT_RSIZE | NFSMNT_RESVPORT);
316 if (inaddr_to_sockaddr("boot.nfsroot.server",
318 printf("nfs_diskless: no server\n");
321 nd->root_saddr.sin_port = htons(NFS_PORT);
322 if (decode_nfshandle("boot.nfsroot.nfshandle",
323 &nd->root_fh[0], NFSX_V2FH) == 0) {
324 printf("nfs_diskless: no NFS handle\n");
327 if ((cp = kern_getenv("boot.nfsroot.path")) != NULL) {
328 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
331 if ((cp = kern_getenv("boot.nfsroot.options")) != NULL) {
332 struct nfs_args args;
335 * XXX yech, convert between old and current
338 args.flags = nd->root_args.flags;
339 args.sotype = nd->root_args.sotype;
340 args.rsize = nd->root_args.rsize;
341 args.wsize = nd->root_args.wsize;
342 nfs_parse_options(cp, &args);
343 nd->root_args.flags = args.flags;
344 nd->root_args.sotype = args.sotype;
345 nd->root_args.rsize = args.rsize;
346 nd->root_args.wsize = args.wsize;
350 nfs_diskless_valid = 1;
355 inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
361 bzero(sa, sizeof(*sa));
362 sa->sin_len = sizeof(*sa);
363 sa->sin_family = AF_INET;
365 if ((cp = kern_getenv(ev)) == NULL)
367 count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
371 sa->sin_addr.s_addr =
372 htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
377 hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
383 bzero(sa, sizeof(*sa));
384 sa->sdl_len = sizeof(*sa);
385 sa->sdl_family = AF_LINK;
386 sa->sdl_type = IFT_ETHER;
387 sa->sdl_alen = ETHER_ADDR_LEN;
388 if ((cp = kern_getenv(ev)) == NULL)
390 count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
391 &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
395 sa->sdl_data[0] = a[0];
396 sa->sdl_data[1] = a[1];
397 sa->sdl_data[2] = a[2];
398 sa->sdl_data[3] = a[3];
399 sa->sdl_data[4] = a[4];
400 sa->sdl_data[5] = a[5];
405 decode_nfshandle(char *ev, u_char *fh, int maxfh)
410 ep = cp = kern_getenv(ev);
413 if ((strlen(cp) < 2) || (*cp != 'X')) {
424 if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
438 #if !defined(BOOTP_NFSROOT)
443 nfs_setup_diskless();
444 if (nfs_diskless_valid)
445 rootdevnames[0] = "nfs:";
448 SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);