dev_net.c revision 1.1 
1/* $NetBSD: dev_net.c,v 1.1 2002/11/09 06:20:41 cgd Exp $ */
2
3/*
4 * Copyright (c) 1995 Gordon W. Ross
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 * 4. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed by Gordon W. Ross
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * This module implements a "raw device" interface suitable for
35 * use by the stand-alone I/O library NFS code.  This interface
36 * does not support any "block" access, and exists only for the
37 * purpose of initializing the network interface, getting boot
38 * parameters, and performing the NFS mount.
39 *
40 * At open time, this does:
41 *
42 * find interface      - netif_open()
43 * RARP for IP address - rarp_getipaddress()
44 * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
45 * RPC/mountd          - nfs_mount(sock, ip, path)
46 *
47 * the root file handle from mountd is saved in a global
48 * for use by the NFS open code (NFS/lookup).
49 */
50
51#include <machine/stdarg.h>
52#include <sys/param.h>
53#include <sys/socket.h>
54#include <net/if.h>
55#include <netinet/in.h>
56#include <netinet/in_systm.h>
57
58#include <lib/libsa/stand.h>
59#include <lib/libsa/net.h>
60#include <lib/libsa/netif.h>
61#include <lib/libsa/bootparam.h>
62#include <lib/libsa/nfs.h>
63
64#include <lib/libkern/libkern.h>
65
66#include <lib/libsa/dev_net.h>
67
68#ifndef SUN_BOOTPARAMS
69void bootp      __P((int));
70#endif
71
72extern int debug;
73extern int nfs_root_node[];	/* XXX - get from nfs_mount() */
74
75/*
76 * Various globals needed by the network code:
77 */
78
79#if 0
80/* for arp.c, rarp.c */
81u_char bcea[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
82#endif
83
84struct	in_addr myip;		/* my ip address */
85struct	in_addr rootip;		/* root ip address */
86struct	in_addr gateip;		/* swap ip address */
87n_long	netmask;		/* subnet or net mask */
88
89char rootpath[FNAME_SIZE];
90
91int hostnamelen;
92char hostname[FNAME_SIZE];
93
94int domainnamelen;
95char domainname[FNAME_SIZE];
96
97/*
98 * Local things...
99 */
100static int netdev_sock = -1;
101static int netdev_opens;
102
103int net_getparams __P((int));
104
105/*
106 * Called by devopen after it sets f->f_dev to our devsw entry.
107 * This opens the low-level device and sets f->f_devdata.
108 * This is declared with variable arguments...
109 */
110int
111net_open(struct open_file *f, ...)
112{
113	va_list ap;
114	char *devname;		/* Device part of file name (or NULL). */
115	int error = 0;
116
117	va_start(ap, f);
118	devname = va_arg(ap, char*);
119	va_end(ap);
120
121#ifdef	NETIF_DEBUG
122	if (debug)
123		printf("net_open: %s\n", devname);
124#endif
125
126	/* On first open, do netif open, mount, etc. */
127	if (netdev_opens == 0) {
128		/* Find network interface. */
129		if (netdev_sock < 0) {
130			netdev_sock = netif_open(devname);
131			if (netdev_sock < 0) {
132				printf("net_open: netif_open() failed\n");
133				return (ENXIO);
134			}
135			if (debug)
136				printf("net_open: netif_open() succeeded\n");
137		}
138		if (rootip.s_addr == 0) {
139			/* Get root IP address, and path, etc. */
140			error = net_getparams(netdev_sock);
141			if (error) {
142				/* getparams makes its own noise */
143				goto fail;
144			}
145			/* Get the NFS file handle (mountd). */
146			error = nfs_mount(netdev_sock, rootip, rootpath);
147			if (error) {
148				error = errno;
149				printf("net_open: NFS mount error=%d\n", error);
150				rootip.s_addr = 0;
151			fail:
152				netif_close(netdev_sock);
153				netdev_sock = -1;
154				return (error);
155			}
156			if (debug)
157				printf("net_open: NFS mount succeeded\n");
158		}
159	}
160	netdev_opens++;
161	f->f_devdata = nfs_root_node;
162	return (error);
163}
164
165int
166net_close(f)
167	struct open_file *f;
168{
169
170#ifdef	NETIF_DEBUG
171	if (debug)
172		printf("net_close: opens=%d\n", netdev_opens);
173#endif
174
175	/* On last close, do netif close, etc. */
176	f->f_devdata = NULL;
177	/* Extra close call? */
178	if (netdev_opens <= 0)
179		return (0);
180	netdev_opens--;
181	/* Not last close? */
182	if (netdev_opens > 0)
183		return(0);
184	rootip.s_addr = 0;
185	if (netdev_sock >= 0) {
186		if (debug)
187			printf("net_close: calling netif_close()\n");
188		netif_close(netdev_sock);
189		netdev_sock = -1;
190	}
191	return (0);
192}
193
194int
195net_ioctl(struct open_file *a, u_long b, void *c)
196{
197	return EIO;
198}
199
200int
201net_strategy(void *a, int b, daddr_t c, size_t d, void *e, size_t *f)
202{
203	return EIO;
204}
205
206int
207net_getparams(sock)
208	int sock;
209{
210	/*
211	 * Get info for NFS boot: our IP address, our hostname,
212	 * server IP address, and our root path on the server.
213	 * There are two ways to do this:  The old, Sun way,
214	 * and the more modern, BOOTP way. (RFC951, RFC1048)
215	 */
216
217#ifdef	SUN_BOOTPARAMS
218	/* Get our IP address.  (rarp.c) */
219	if (rarp_getipaddress(sock)) {
220		printf("net_open: RARP failed\n");
221		return (EIO);
222	}
223#else	/* BOOTPARAMS */
224	/*
225	 * Get boot info using BOOTP. (RFC951, RFC1048)
226	 * This also gets the server IP address, gateway,
227	 * root path, etc.
228	 */
229	bootp(sock);
230	if (myip.s_addr == 0) {
231		printf("net_open: BOOTP failed\n");
232		return (EIO);
233	}
234#endif	/* BOOTPARAMS */
235
236	printf("boot: client addr: %s\n", inet_ntoa(myip));
237
238#ifdef	SUN_BOOTPARAMS
239	/* Get our hostname, server IP address, gateway. */
240	if (bp_whoami(sock)) {
241		printf("net_open: bootparam/whoami RPC failed\n");
242		return (EIO);
243	}
244#endif	/* BOOTPARAMS */
245
246	printf("boot: client name: %s\n", hostname);
247	if (gateip.s_addr) {
248		printf("boot: subnet mask: %s\n", intoa(netmask));
249		printf("boot: net gateway: %s\n", inet_ntoa(gateip));
250	}
251
252#ifdef	SUN_BOOTPARAMS
253	/* Get the root pathname. */
254	if (bp_getfile(sock, "root", &rootip, rootpath)) {
255		printf("net_open: bootparam/getfile RPC failed\n");
256		return (EIO);
257	}
258#endif	/* BOOTPARAMS */
259
260	printf("boot: server addr: %s\n", inet_ntoa(rootip));
261	printf("boot: server path: %s\n", rootpath);
262
263	return (0);
264}
265