net.c revision 1.6 
1/*	$NetBSD: net.c,v 1.6 2018/09/30 14:02:06 tsutsui 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 <sys/param.h>
47#include <sys/socket.h>
48#include <net/if.h>
49#include <netinet/in.h>
50#include <netinet/in_systm.h>
51
52#include <lib/libsa/stand.h>
53#include <lib/libsa/net.h>
54#include <lib/libsa/bootparam.h>
55#include <lib/libsa/bootp.h>
56#include <lib/libsa/nfs.h>
57
58#include <lib/libkern/libkern.h>
59
60#include <promdev.h>
61
62#include "netif_news.h"
63
64char rootpath[FNAME_SIZE];
65
66int	netdev_sock = -1;
67static	int open_count;
68
69/*
70 * Called by devopen after it sets f->f_dev to our devsw entry.
71 * This opens the low-level device and sets f->f_devdata.
72 */
73int
74net_open(struct romdev *pd)
75{
76	int error = 0;
77
78	/* On first open, do netif open, mount, etc. */
79	if (open_count == 0) {
80		/* Find network interface. */
81		if ((netdev_sock = netif_news_open(pd)) < 0) {
82			error = errno;
83			goto bad;
84		}
85		if ((error = net_mountroot()) != 0)
86			goto bad;
87	}
88	open_count++;
89bad:
90	return error;
91}
92
93int
94net_close(struct romdev *pd)
95{
96	/* On last close, do netif close, etc. */
97	if (open_count <= 0)
98		return 0;
99
100	if (--open_count == 0)
101		netif_news_close(netdev_sock);
102
103	return 0;
104}
105
106int
107net_mountroot(void)
108{
109
110#ifdef DEBUG
111	printf("net_mountroot\n");
112#endif
113
114	/*
115	 * Get info for NFS boot: our IP address, our hostname,
116	 * server IP address, and our root path on the server.
117	 * There are two ways to do this:  The old, Sun way,
118	 * and the more modern, BOOTP way. (RFC951, RFC1048)
119	 */
120
121#ifdef	SUN_BOOTPARAMS
122	/* Get boot info using RARP and Sun bootparams. */
123
124	/* Get our IP address.  (rarp.c) */
125	if (rarp_getipaddress(netdev_sock) == -1)
126		return (errno);
127
128	printf("boot: client IP address: %s\n", inet_ntoa(myip));
129
130	/* Get our hostname, server IP address. */
131	if (bp_whoami(netdev_sock))
132		return (errno);
133
134	printf("boot: client name: %s\n", hostname);
135
136	/* Get the root pathname. */
137	if (bp_getfile(netdev_sock, "root", &rootip, rootpath))
138		return (errno);
139
140#else
141
142	/* Get boot info using BOOTP way. (RFC951, RFC1048) */
143	bootp(netdev_sock);
144
145	printf("Using IP address: %s\n", inet_ntoa(myip));
146
147	printf("myip: %s (%s)", hostname, inet_ntoa(myip));
148	if (gateip.s_addr)
149		printf(", gateip: %s", inet_ntoa(gateip));
150	if (netmask)
151		printf(", netmask: %s", intoa(netmask));
152	printf("\n");
153
154#endif
155
156	printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);
157
158	/* Get the NFS file handle (mount). */
159	if (nfs_mount(netdev_sock, rootip, rootpath) != 0)
160		return (errno);
161
162	return 0;
163}
164