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, ...)
116 char *devname; /* Device part of file name (or NULL). */
120 devname = va_arg(args, char*);
123 #ifdef NETIF_OPEN_CLOSE_ONCE
124 /* Before opening another interface, close the previous one first. */
125 if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
129 /* On first open, do netif open, mount, etc. */
130 if (netdev_opens == 0) {
131 /* Find network interface. */
132 if (netdev_sock < 0) {
133 netdev_sock = netif_open(devname);
134 if (netdev_sock < 0) {
135 printf("net_open: netif_open() failed\n");
138 netdev_name = strdup(devname);
141 printf("net_open: netif_open() succeeded\n");
145 * If network params were not set by netif_open(), try to get
146 * them via bootp, rarp, etc.
148 if (rootip.s_addr == 0) {
149 /* Get root IP address, and path, etc. */
150 error = net_getparams(netdev_sock);
152 /* getparams makes its own noise */
154 netif_close(netdev_sock);
160 * Set the variables required by the kernel's nfs_diskless
161 * mechanism. This is the minimum set of variables required to
162 * mount a root filesystem without needing to obtain additional
163 * info from bootp or other sources.
165 d = socktodesc(netdev_sock);
166 setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1);
167 setenv("boot.netif.ip", inet_ntoa(myip), 1);
168 setenv("boot.netif.netmask", intoa(netmask), 1);
169 setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
170 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
171 setenv("boot.nfsroot.path", rootpath, 1);
174 sprintf(mtu, "%u", intf_mtu);
175 setenv("boot.netif.mtu", mtu, 1);
180 f->f_devdata = &netdev_sock;
185 net_close(struct open_file *f)
190 printf("net_close: opens=%d\n", netdev_opens);
195 #ifndef NETIF_OPEN_CLOSE_ONCE
196 /* Extra close call? */
197 if (netdev_opens <= 0)
200 /* Not last close? */
201 if (netdev_opens > 0)
203 /* On last close, do netif close, etc. */
206 printf("net_close: calling net_cleanup()\n");
217 if (netdev_sock >= 0) {
220 printf("net_cleanup: calling netif_close()\n");
224 netif_close(netdev_sock);
236 #define SUPPORT_BOOTP
239 * Get info for NFS boot: our IP address, our hostname,
240 * server IP address, and our root path on the server.
241 * There are two ways to do this: The old, Sun way,
242 * and the more modern, BOOTP way. (RFC951, RFC1048)
244 * The default is to use the Sun bootparams RPC
245 * (because that is what the kernel will do).
246 * MD code can make try_bootp initialied data,
247 * which will override this common definition.
253 extern n_long ip_convertaddr(char *p);
256 net_getparams(int sock)
258 char buf[MAXHOSTNAMELEN];
259 n_long rootaddr, smask;
263 * Try to get boot info using BOOTP. If we succeed, then
264 * the server IP address, gateway, and root path will all
265 * be initialized. If any remain uninitialized, we will
266 * use RARP and RPC/bootparam (the Sun way) to get them.
269 bootp(sock, BOOTP_NONE);
270 if (myip.s_addr != 0)
274 printf("net_open: BOOTP failed, trying RARP/RPC...\n");
279 * Use RARP to get our IP address. This also sets our
280 * netmask to the "natural" default for our address.
282 if (rarp_getipaddress(sock)) {
283 printf("net_open: RARP failed\n");
286 printf("net_open: client addr: %s\n", inet_ntoa(myip));
288 /* Get our hostname, server IP address, gateway. */
289 if (bp_whoami(sock)) {
290 printf("net_open: bootparam/whoami RPC failed\n");
295 printf("net_open: client name: %s\n", hostname);
299 * Ignore the gateway from whoami (unreliable).
300 * Use the "gateway" parameter instead.
304 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
305 /* Got it! Parse the netmask. */
306 smask = ip_convertaddr(buf);
312 printf("net_open: subnet mask: %s\n", intoa(netmask));
316 if (gateip.s_addr && debug)
317 printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
320 /* Get the root server and pathname. */
321 if (bp_getfile(sock, "root", &rootip, rootpath)) {
322 printf("net_open: bootparam/getfile RPC failed\n");
326 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
327 rootip.s_addr = rootaddr;
331 printf("net_open: server addr: %s\n", inet_ntoa(rootip));
332 printf("net_open: server path: %s\n", rootpath);
340 net_print(int verbose)
342 struct netif_driver *drv;
346 for (d = 0; netif_drivers[d]; d++) {
347 drv = netif_drivers[d];
348 for (i = 0; i < drv->netif_nifs; i++) {
349 printf("\t%s%d:", "net", cnt++);
351 printf(" (%s%d)", drv->netif_bname,
352 drv->netif_ifs[i].dif_unit);
359 * Strip the server's address off of the rootpath if present and return it in
360 * network byte order, leaving just the pathname part in the global rootpath.
366 n_long addr = INADDR_NONE;
368 for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
369 if (rootpath[i] == ':')
371 if (i && i != FNAME_SIZE && rootpath[i] == ':') {
372 rootpath[i++] = '\0';
373 addr = inet_addr(&rootpath[0]);
374 bcopy(&rootpath[i], rootpath, strlen(&rootpath[i])+1);