dev_net.c revision 1.5 
1/* $NetBSD: dev_net.c,v 1.5 2009/10/21 23:12:09 snj 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/*
29 * This module implements a "raw device" interface suitable for
30 * use by the stand-alone I/O library NFS code.  This interface
31 * does not support any "block" access, and exists only for the
32 * purpose of initializing the network interface, getting boot
33 * parameters, and performing the NFS mount.
34 *
35 * At open time, this does:
36 *
37 * find interface      - netif_open()
38 * RARP for IP address - rarp_getipaddress()
39 * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
40 * RPC/mountd          - nfs_mount(sock, ip, path)
41 *
42 * the root file handle from mountd is saved in a global
43 * for use by the NFS open code (NFS/lookup).
44 */
45
46#include <machine/stdarg.h>
47#include <sys/param.h>
48#include <sys/socket.h>
49#include <net/if.h>
50#include <netinet/in.h>
51#include <netinet/in_systm.h>
52
53#include <lib/libsa/stand.h>
54#include <lib/libsa/net.h>
55#include <lib/libsa/netif.h>
56#include <lib/libsa/bootparam.h>
57#include <lib/libsa/nfs.h>
58
59#include <lib/libkern/libkern.h>
60
61#include <lib/libsa/dev_net.h>
62
63#ifndef SUN_BOOTPARAMS
64void bootp(int);
65#endif
66
67extern int debug;
68extern int nfs_root_node[];	/* XXX - get from nfs_mount() */
69
70/*
71 * Various globals needed by the network code:
72 */
73
74#if 0
75/* for arp.c, rarp.c */
76u_char bcea[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
77#endif
78
79struct	in_addr myip;		/* my ip address */
80struct	in_addr rootip;		/* root ip address */
81struct	in_addr gateip;		/* swap ip address */
82n_long	netmask;		/* subnet or net mask */
83
84char rootpath[FNAME_SIZE];
85char hostname[FNAME_SIZE];
86
87/*
88 * Local things...
89 */
90static int netdev_sock = -1;
91static int netdev_opens;
92
93int net_getparams(int);
94
95/*
96 * Called by devopen after it sets f->f_dev to our devsw entry.
97 * This opens the low-level device and sets f->f_devdata.
98 * This is declared with variable arguments...
99 */
100int
101net_open(struct open_file *f, ...)
102{
103	va_list ap;
104	char *devname;		/* Device part of file name (or NULL). */
105	int error = 0;
106
107	va_start(ap, f);
108	devname = va_arg(ap, char*);
109	va_end(ap);
110
111#ifdef	NETIF_DEBUG
112	if (debug)
113		printf("net_open: %s\n", devname);
114#endif
115
116	/* On first open, do netif open, mount, etc. */
117	if (netdev_opens == 0) {
118		/* Find network interface. */
119		if (netdev_sock < 0) {
120			netdev_sock = netif_open(devname);
121			if (netdev_sock < 0) {
122				printf("net_open: netif_open() failed\n");
123				return (ENXIO);
124			}
125			if (debug)
126				printf("net_open: netif_open() succeeded\n");
127		}
128		if (rootip.s_addr == 0) {
129			/* Get root IP address, and path, etc. */
130			error = net_getparams(netdev_sock);
131			if (error) {
132				/* getparams makes its own noise */
133				goto fail;
134			}
135			/* Get the NFS file handle (mountd). */
136			error = nfs_mount(netdev_sock, rootip, rootpath);
137			if (error) {
138				error = errno;
139				printf("net_open: NFS mount error=%d\n", error);
140				rootip.s_addr = 0;
141			fail:
142				netif_close(netdev_sock);
143				netdev_sock = -1;
144				return (error);
145			}
146			if (debug)
147				printf("net_open: NFS mount succeeded\n");
148		}
149	}
150	netdev_opens++;
151	f->f_devdata = nfs_root_node;
152	return (error);
153}
154
155int
156net_close(struct open_file *f)
157{
158
159#ifdef	NETIF_DEBUG
160	if (debug)
161		printf("net_close: opens=%d\n", netdev_opens);
162#endif
163
164	/* On last close, do netif close, etc. */
165	f->f_devdata = NULL;
166	/* Extra close call? */
167	if (netdev_opens <= 0)
168		return (0);
169	netdev_opens--;
170	/* Not last close? */
171	if (netdev_opens > 0)
172		return(0);
173	rootip.s_addr = 0;
174	if (netdev_sock >= 0) {
175		if (debug)
176			printf("net_close: calling netif_close()\n");
177		netif_close(netdev_sock);
178		netdev_sock = -1;
179	}
180	return (0);
181}
182
183int
184net_ioctl(struct open_file *a, u_long b, void *c)
185{
186	return EIO;
187}
188
189int
190net_strategy(void *a, int b, daddr_t c, size_t d, void *e, size_t *f)
191{
192	return EIO;
193}
194
195int
196net_getparams(int sock)
197{
198	/*
199	 * Get info for NFS boot: our IP address, our hostname,
200	 * server IP address, and our root path on the server.
201	 * There are two ways to do this:  The old, Sun way,
202	 * and the more modern, BOOTP way. (RFC951, RFC1048)
203	 */
204
205#ifdef	SUN_BOOTPARAMS
206	/* Get our IP address.  (rarp.c) */
207	if (rarp_getipaddress(sock)) {
208		printf("net_open: RARP failed\n");
209		return (EIO);
210	}
211#else	/* BOOTPARAMS */
212	/*
213	 * Get boot info using BOOTP. (RFC951, RFC1048)
214	 * This also gets the server IP address, gateway,
215	 * root path, etc.
216	 */
217	bootp(sock);
218	if (myip.s_addr == 0) {
219		printf("net_open: BOOTP failed\n");
220		return (EIO);
221	}
222#endif	/* BOOTPARAMS */
223
224	printf("boot: client addr: %s\n", inet_ntoa(myip));
225
226#ifdef	SUN_BOOTPARAMS
227	/* Get our hostname, server IP address, gateway. */
228	if (bp_whoami(sock)) {
229		printf("net_open: bootparam/whoami RPC failed\n");
230		return (EIO);
231	}
232#endif	/* BOOTPARAMS */
233
234	printf("boot: client name: %s\n", hostname);
235	if (gateip.s_addr) {
236		printf("boot: subnet mask: %s\n", intoa(netmask));
237		printf("boot: net gateway: %s\n", inet_ntoa(gateip));
238	}
239
240#ifdef	SUN_BOOTPARAMS
241	/* Get the root pathname. */
242	if (bp_getfile(sock, "root", &rootip, rootpath)) {
243		printf("net_open: bootparam/getfile RPC failed\n");
244		return (EIO);
245	}
246#endif	/* BOOTPARAMS */
247
248	printf("boot: server addr: %s\n", inet_ntoa(rootip));
249	printf("boot: server path: %s\n", rootpath);
250
251	return (0);
252}
253