1 /* $NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin Exp $ */
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
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.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 * This module implements a "raw device" interface suitable for
37 * use by the stand-alone I/O library NFS code. This interface
38 * does not support any "block" access, and exists only for the
39 * purpose of initializing the network interface, getting boot
40 * parameters, and performing the NFS mount.
42 * At open time, this does:
44 * find interface - netif_open()
45 * RARP for IP address - rarp_getipaddress()
46 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...)
47 * RPC/mountd - nfs_mount(sock, ip, path)
49 * the root file handle from mountd is saved in a global
50 * for use by the NFS open code (NFS/lookup).
53 #include <machine/stdarg.h>
54 #include <sys/param.h>
55 #include <sys/socket.h>
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
65 #include <bootparam.h>
68 #include "bootstrap.h"
74 static char *netdev_name;
75 static int netdev_sock = -1;
76 static int netdev_opens;
78 static int net_init(void);
79 static int net_open(struct open_file *, ...);
80 static int net_close(struct open_file *);
81 static void net_cleanup(void);
82 static int net_strategy();
83 static void net_print(int);
85 static int net_getparams(int sock);
87 struct devsw netdev = {
107 * Called by devopen after it sets f->f_dev to our devsw entry.
108 * This opens the low-level device and sets f->f_devdata.
109 * This is declared with variable arguments...
112 net_open(struct open_file *f, ...)
114 char temp[FNAME_SIZE];
117 char *devname; /* Device part of file name (or NULL). */
121 devname = va_arg(args, char*);
124 #ifdef NETIF_OPEN_CLOSE_ONCE
125 /* Before opening another interface, close the previous one first. */
126 if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
130 /* On first open, do netif open, mount, etc. */
131 if (netdev_opens == 0) {
132 /* Find network interface. */
133 if (netdev_sock < 0) {
134 netdev_sock = netif_open(devname);
135 if (netdev_sock < 0) {
136 printf("net_open: netif_open() failed\n");
139 netdev_name = strdup(devname);
142 printf("net_open: netif_open() succeeded\n");
146 * If network params were not set by netif_open(), try to get
147 * them via bootp, rarp, etc.
149 if (rootip.s_addr == 0) {
150 /* Get root IP address, and path, etc. */
151 error = net_getparams(netdev_sock);
153 /* getparams makes its own noise */
155 netif_close(netdev_sock);
161 * Set the variables required by the kernel's nfs_diskless
162 * mechanism. This is the minimum set of variables required to
163 * mount a root filesystem without needing to obtain additional
164 * info from bootp or other sources.
166 d = socktodesc(netdev_sock);
167 sprintf(temp, "%6D", d->myea, ":");
168 setenv("boot.netif.hwaddr", temp, 1);
169 setenv("boot.netif.ip", inet_ntoa(myip), 1);
170 setenv("boot.netif.netmask", intoa(netmask), 1);
171 setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
172 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
173 setenv("boot.nfsroot.path", rootpath, 1);
176 f->f_devdata = &netdev_sock;
181 net_close(struct open_file *f)
186 printf("net_close: opens=%d\n", netdev_opens);
191 #ifndef NETIF_OPEN_CLOSE_ONCE
192 /* Extra close call? */
193 if (netdev_opens <= 0)
196 /* Not last close? */
197 if (netdev_opens > 0)
199 /* On last close, do netif close, etc. */
202 printf("net_close: calling net_cleanup()\n");
213 if (netdev_sock >= 0) {
216 printf("net_cleanup: calling netif_close()\n");
220 netif_close(netdev_sock);
232 #define SUPPORT_BOOTP
235 * Get info for NFS boot: our IP address, our hostname,
236 * server IP address, and our root path on the server.
237 * There are two ways to do this: The old, Sun way,
238 * and the more modern, BOOTP way. (RFC951, RFC1048)
240 * The default is to use the Sun bootparams RPC
241 * (because that is what the kernel will do).
242 * MD code can make try_bootp initialied data,
243 * which will override this common definition.
249 extern n_long ip_convertaddr(char *p);
252 net_getparams(int sock)
254 char buf[MAXHOSTNAMELEN];
255 n_long rootaddr, smask;
259 * Try to get boot info using BOOTP. If we succeed, then
260 * the server IP address, gateway, and root path will all
261 * be initialized. If any remain uninitialized, we will
262 * use RARP and RPC/bootparam (the Sun way) to get them.
265 bootp(sock, BOOTP_NONE);
266 if (myip.s_addr != 0)
270 printf("net_open: BOOTP failed, trying RARP/RPC...\n");
275 * Use RARP to get our IP address. This also sets our
276 * netmask to the "natural" default for our address.
278 if (rarp_getipaddress(sock)) {
279 printf("net_open: RARP failed\n");
282 printf("net_open: client addr: %s\n", inet_ntoa(myip));
284 /* Get our hostname, server IP address, gateway. */
285 if (bp_whoami(sock)) {
286 printf("net_open: bootparam/whoami RPC failed\n");
291 printf("net_open: client name: %s\n", hostname);
295 * Ignore the gateway from whoami (unreliable).
296 * Use the "gateway" parameter instead.
300 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
301 /* Got it! Parse the netmask. */
302 smask = ip_convertaddr(buf);
308 printf("net_open: subnet mask: %s\n", intoa(netmask));
312 if (gateip.s_addr && debug)
313 printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
316 /* Get the root server and pathname. */
317 if (bp_getfile(sock, "root", &rootip, rootpath)) {
318 printf("net_open: bootparam/getfile RPC failed\n");
322 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
323 rootip.s_addr = rootaddr;
327 printf("net_open: server addr: %s\n", inet_ntoa(rootip));
328 printf("net_open: server path: %s\n", rootpath);
336 net_print(int verbose)
338 struct netif_driver *drv;
342 for (d = 0; netif_drivers[d]; d++) {
343 drv = netif_drivers[d];
344 for (i = 0; i < drv->netif_nifs; i++) {
345 printf("\t%s%d:", "net", cnt++);
347 printf(" (%s%d)", drv->netif_bname,
348 drv->netif_ifs[i].dif_unit);
355 * Strip the server's address off of the rootpath if present and return it in
356 * network byte order, leaving just the pathname part in the global rootpath.
362 n_long addr = INADDR_NONE;
364 for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
365 if (rootpath[i] == ':')
367 if (i && i != FNAME_SIZE && rootpath[i] == ':') {
368 rootpath[i++] = '\0';
369 addr = inet_addr(&rootpath[0]);
370 bcopy(&rootpath[i], rootpath, strlen(&rootpath[i])+1);