net.c revision 1.11 
1/*	$NetBSD: net.c,v 1.11 2021/04/12 03:55:40 mrg 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/netif.h>
55#include <lib/libsa/bootparam.h>
56#include <lib/libsa/bootp.h>
57#include <lib/libsa/nfs.h>
58
59#include <lib/libkern/libkern.h>
60
61#include <sparc/stand/common/promdev.h>
62
63int	netdev_sock = -1;
64static	int open_count;
65
66static int net_mountroot_bootparams(void);
67static int net_mountroot_bootp(void);
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 promdata *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_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 promdata *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		return (netif_close(netdev_sock));
102
103	return (0);
104}
105
106int
107net_mountroot_bootparams(void)
108{
109	printf("Trying BOOTPARAMS protocol... ");
110
111	/* Get our IP address.  (rarp.c) */
112	if (rarp_getipaddress(netdev_sock) == -1)
113		return (errno);
114
115	printf("ip address: %s", inet_ntoa(myip));
116
117	/* Get our hostname, server IP address. */
118	if (bp_whoami(netdev_sock))
119		return (errno);
120
121	printf(", hostname: %s\n", hostname);
122
123	/* Get the root pathname. */
124	if (bp_getfile(netdev_sock, "root", &rootip, rootpath))
125		return (errno);
126
127	return (0);
128}
129
130int
131net_mountroot_bootp(void)
132{
133	printf("Trying BOOTP protocol... ");
134
135	bootp(netdev_sock);
136
137	if (myip.s_addr == 0)
138		return(ENOENT);
139
140	printf("ip address: %s", inet_ntoa(myip));
141
142	if (hostname[0])
143		printf(", hostname: %s", hostname);
144	if (netmask)
145		printf(", netmask: %s", intoa(netmask));
146	if (gateip.s_addr)
147		printf(", gateway: %s", inet_ntoa(gateip));
148	printf("\n");
149
150	return (0);
151}
152
153int
154net_mountroot(void)
155{
156	int error;
157
158#ifdef DEBUG
159	printf("net_mountroot\n");
160#endif
161
162	/*
163	 * Get info for NFS boot: our IP address, our hostname,
164	 * server IP address, and our root path on the server.
165	 * There are two ways to do this:  The old, Sun way,
166	 * and the more modern, BOOTP way. (RFC951, RFC1048)
167	 */
168
169	/* Try BOOTP first */
170	error = net_mountroot_bootp();
171	/* Historically, we've used BOOTPARAMS, so try that next */
172	if (error != 0)
173		error = net_mountroot_bootparams();
174	if (error != 0)
175		return (error);
176
177	printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);
178
179	/* Get the NFS file handle (mount). */
180	if (nfs_mount(netdev_sock, rootip, rootpath) != 0)
181		return (errno);
182
183	return (0);
184}
185