dev_net.c revision 1.4 
1/* $NetBSD: dev_net.c,v 1.4 2009/03/14 15:36:13 dsl 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(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];
90char hostname[FNAME_SIZE];
91
92/*
93 * Local things...
94 */
95static int netdev_sock = -1;
96static int netdev_opens;
97
98int net_getparams(int);
99
100/*
101 * Called by devopen after it sets f->f_dev to our devsw entry.
102 * This opens the low-level device and sets f->f_devdata.
103 * This is declared with variable arguments...
104 */
105int
106net_open(struct open_file *f, ...)
107{
108	va_list ap;
109	char *devname;		/* Device part of file name (or NULL). */
110	int error = 0;
111
112	va_start(ap, f);
113	devname = va_arg(ap, char*);
114	va_end(ap);
115
116#ifdef	NETIF_DEBUG
117	if (debug)
118		printf("net_open: %s\n", devname);
119#endif
120
121	/* On first open, do netif open, mount, etc. */
122	if (netdev_opens == 0) {
123		/* Find network interface. */
124		if (netdev_sock < 0) {
125			netdev_sock = netif_open(devname);
126			if (netdev_sock < 0) {
127				printf("net_open: netif_open() failed\n");
128				return (ENXIO);
129			}
130			if (debug)
131				printf("net_open: netif_open() succeeded\n");
132		}
133		if (rootip.s_addr == 0) {
134			/* Get root IP address, and path, etc. */
135			error = net_getparams(netdev_sock);
136			if (error) {
137				/* getparams makes its own noise */
138				goto fail;
139			}
140			/* Get the NFS file handle (mountd). */
141			error = nfs_mount(netdev_sock, rootip, rootpath);
142			if (error) {
143				error = errno;
144				printf("net_open: NFS mount error=%d\n", error);
145				rootip.s_addr = 0;
146			fail:
147				netif_close(netdev_sock);
148				netdev_sock = -1;
149				return (error);
150			}
151			if (debug)
152				printf("net_open: NFS mount succeeded\n");
153		}
154	}
155	netdev_opens++;
156	f->f_devdata = nfs_root_node;
157	return (error);
158}
159
160int
161net_close(struct open_file *f)
162{
163
164#ifdef	NETIF_DEBUG
165	if (debug)
166		printf("net_close: opens=%d\n", netdev_opens);
167#endif
168
169	/* On last close, do netif close, etc. */
170	f->f_devdata = NULL;
171	/* Extra close call? */
172	if (netdev_opens <= 0)
173		return (0);
174	netdev_opens--;
175	/* Not last close? */
176	if (netdev_opens > 0)
177		return(0);
178	rootip.s_addr = 0;
179	if (netdev_sock >= 0) {
180		if (debug)
181			printf("net_close: calling netif_close()\n");
182		netif_close(netdev_sock);
183		netdev_sock = -1;
184	}
185	return (0);
186}
187
188int
189net_ioctl(struct open_file *a, u_long b, void *c)
190{
191	return EIO;
192}
193
194int
195net_strategy(void *a, int b, daddr_t c, size_t d, void *e, size_t *f)
196{
197	return EIO;
198}
199
200int
201net_getparams(int sock)
202{
203	/*
204	 * Get info for NFS boot: our IP address, our hostname,
205	 * server IP address, and our root path on the server.
206	 * There are two ways to do this:  The old, Sun way,
207	 * and the more modern, BOOTP way. (RFC951, RFC1048)
208	 */
209
210#ifdef	SUN_BOOTPARAMS
211	/* Get our IP address.  (rarp.c) */
212	if (rarp_getipaddress(sock)) {
213		printf("net_open: RARP failed\n");
214		return (EIO);
215	}
216#else	/* BOOTPARAMS */
217	/*
218	 * Get boot info using BOOTP. (RFC951, RFC1048)
219	 * This also gets the server IP address, gateway,
220	 * root path, etc.
221	 */
222	bootp(sock);
223	if (myip.s_addr == 0) {
224		printf("net_open: BOOTP failed\n");
225		return (EIO);
226	}
227#endif	/* BOOTPARAMS */
228
229	printf("boot: client addr: %s\n", inet_ntoa(myip));
230
231#ifdef	SUN_BOOTPARAMS
232	/* Get our hostname, server IP address, gateway. */
233	if (bp_whoami(sock)) {
234		printf("net_open: bootparam/whoami RPC failed\n");
235		return (EIO);
236	}
237#endif	/* BOOTPARAMS */
238
239	printf("boot: client name: %s\n", hostname);
240	if (gateip.s_addr) {
241		printf("boot: subnet mask: %s\n", intoa(netmask));
242		printf("boot: net gateway: %s\n", inet_ntoa(gateip));
243	}
244
245#ifdef	SUN_BOOTPARAMS
246	/* Get the root pathname. */
247	if (bp_getfile(sock, "root", &rootip, rootpath)) {
248		printf("net_open: bootparam/getfile RPC failed\n");
249		return (EIO);
250	}
251#endif	/* BOOTPARAMS */
252
253	printf("boot: server addr: %s\n", inet_ntoa(rootip));
254	printf("boot: server path: %s\n", rootpath);
255
256	return (0);
257}
258