1/*	$NetBSD: net.c,v 1.10 2021/04/12 03:55:40 mrg Exp $	*/
2
3/*
4 * Copyright (C) 1995 Wolfgang Solfrank.
5 * Copyright (C) 1995 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/*
35 * This module implements a "raw device" interface suitable for
36 * use by the stand-alone I/O library NFS code.  This interface
37 * does not support any "block" access, and exists only for the
38 * purpose of initializing the network interface, getting boot
39 * parameters, and performing the NFS mount.
40 *
41 * At open time, this does:
42 *
43 * find interface	- netif_of_open()
44 * BOOTP		- bootp()
45 * RPC/mountd		- nfs_mount()
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 * Note: this is based in part on sys/arch/sparc/stand/net.c
51 */
52
53#include "net.h"
54
55#include <sys/param.h>
56#include <sys/socket.h>
57
58#include <net/if.h>
59#include <netinet/in.h>
60#include <netinet/in_systm.h>
61
62#include <lib/libsa/stand.h>
63#include <lib/libsa/bootp.h>
64#include <lib/libsa/net.h>
65#include <lib/libsa/nfs.h>
66
67#include <lib/libkern/libkern.h>
68
69#include "ofdev.h"
70#include "netif_of.h"
71
72static	int netdev_sock = -1;
73static	int open_count;
74
75static int net_mountroot(void);
76
77/*
78 * Called by devopen after it sets f->f_dev to our devsw entry.
79 * This opens the low-level device and sets f->f_devdata.
80 */
81int
82net_open(struct of_dev *op)
83{
84	int error = 0;
85
86	/*
87	 * On first open, do netif open, mount, etc.
88	 */
89	if (open_count == 0) {
90		/* Find network interface. */
91		if ((netdev_sock = netif_of_open(op)) < 0) {
92			error = errno;
93			goto bad;
94		}
95		if ((error = net_mountroot()) != 0)
96			goto bad;
97	}
98	open_count++;
99bad:
100	if (netdev_sock >= 0 && open_count == 0) {
101		netif_of_close(netdev_sock);
102		netdev_sock = -1;
103	}
104	return error;
105}
106
107int
108net_close(struct of_dev *op)
109{
110	/*
111	 * On last close, do netif close, etc.
112	 */
113	if (open_count > 0)
114		if (--open_count == 0) {
115			netif_of_close(netdev_sock);
116			netdev_sock = -1;
117		}
118	return 0;
119}
120
121static int
122net_mountroot(void)
123{
124
125#ifdef	DEBUG
126	printf("net_mountroot\n");
127#endif
128
129	/*
130	 * Get info for NFS boot: our IP address, out hostname,
131	 * server IP address, and our root path on the server.
132	 * We use BOOTP (RFC951, RFC1532) exclusively as mandated
133	 * by PowerPC Reference Platform Specification I.4.2
134	 */
135
136	bootp(netdev_sock);
137
138	if (myip.s_addr == 0)
139		return ETIMEDOUT;
140
141	printf("Using IP address: %s\n", inet_ntoa(myip));
142
143#ifdef	DEBUG
144	printf("myip: %s (%s)", hostname, inet_ntoa(myip));
145	if (gateip.s_addr)
146		printf(", gateip: %s", inet_ntoa(gateip));
147	if (netmask)
148		printf(", netmask: %s", intoa(netmask));
149	printf("\n");
150#endif
151	printf("root addr=%s path=%s\n", inet_ntoa(rootip), rootpath);
152
153	/*
154	 * Get the NFS file handle (mount).
155	 */
156	if (nfs_mount(netdev_sock, rootip, rootpath) < 0)
157		return errno;
158	return 0;
159}
160