net.c revision 1.8 
1/*	$NetBSD: net.c,v 1.8 2006/07/13 20:03:34 uwe 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 <sys/param.h>
52#include <sys/socket.h>
53#include <net/if.h>
54#include <netinet/in.h>
55#include <netinet/in_systm.h>
56
57#include <lib/libsa/stand.h>
58#include <lib/libsa/net.h>
59#include <lib/libsa/netif.h>
60#include <lib/libsa/bootparam.h>
61#include <lib/libsa/bootp.h>
62#include <lib/libsa/nfs.h>
63
64#include <lib/libkern/libkern.h>
65
66#include <sparc/stand/common/promdev.h>
67
68char		rootpath[FNAME_SIZE];
69
70int	netdev_sock = -1;
71static	int open_count;
72
73static int net_mountroot_bootparams(void);
74static int net_mountroot_bootp(void);
75
76/*
77 * Called by devopen after it sets f->f_dev to our devsw entry.
78 * This opens the low-level device and sets f->f_devdata.
79 */
80int
81net_open(struct promdata *pd)
82{
83	int error = 0;
84
85	/* On first open, do netif open, mount, etc. */
86	if (open_count == 0) {
87		/* Find network interface. */
88		if ((netdev_sock = netif_open(pd)) < 0) {
89			error = errno;
90			goto bad;
91		}
92		if ((error = net_mountroot()) != 0)
93			goto bad;
94	}
95	open_count++;
96bad:
97	return (error);
98}
99
100int
101net_close(struct promdata *pd)
102{
103	/* On last close, do netif close, etc. */
104	if (open_count <= 0)
105		return (0);
106
107	if (--open_count == 0)
108		return (netif_close(netdev_sock));
109
110	return (0);
111}
112
113int
114net_mountroot_bootparams(void)
115{
116	printf("Trying BOOTPARAMS protocol... ");
117
118	/* Get our IP address.  (rarp.c) */
119	if (rarp_getipaddress(netdev_sock) == -1)
120		return (errno);
121
122	printf("ip address: %s", inet_ntoa(myip));
123
124	/* Get our hostname, server IP address. */
125	if (bp_whoami(netdev_sock))
126		return (errno);
127
128	printf(", hostname: %s\n", hostname);
129
130	/* Get the root pathname. */
131	if (bp_getfile(netdev_sock, "root", &rootip, rootpath))
132		return (errno);
133
134	return (0);
135}
136
137int
138net_mountroot_bootp(void)
139{
140	printf("Trying BOOTP protocol... ");
141
142	bootp(netdev_sock);
143
144	if (myip.s_addr == 0)
145		return(ENOENT);
146
147	printf("ip address: %s", inet_ntoa(myip));
148
149	if (hostname[0])
150		printf(", hostname: %s", hostname);
151	if (netmask)
152		printf(", netmask: %s", intoa(netmask));
153	if (gateip.s_addr)
154		printf(", gateway: %s", inet_ntoa(gateip));
155	printf("\n");
156
157	return (0);
158}
159
160int
161net_mountroot(void)
162{
163	int error;
164
165#ifdef DEBUG
166	printf("net_mountroot\n");
167#endif
168
169	/*
170	 * Get info for NFS boot: our IP address, our hostname,
171	 * server IP address, and our root path on the server.
172	 * There are two ways to do this:  The old, Sun way,
173	 * and the more modern, BOOTP way. (RFC951, RFC1048)
174	 */
175
176	/* Try BOOTP first */
177	error = net_mountroot_bootp();
178	/* Historically, we've used BOOTPARAMS, so try that next */
179	if (error != 0)
180		error = net_mountroot_bootparams();
181	if (error != 0)
182		return (error);
183
184	printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);
185
186	/* Get the NFS file handle (mount). */
187	if (nfs_mount(netdev_sock, rootip, rootpath) != 0)
188		return (errno);
189
190	return (0);
191}
192