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
72 static int netdev_sock = -1;
73 static int open_count;
74
75 static 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 */
81 int
net_open(struct of_dev * op)82 net_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++;
99 bad:
100 if (netdev_sock >= 0 && open_count == 0) {
101 netif_of_close(netdev_sock);
102 netdev_sock = -1;
103 }
104 return error;
105 }
106
107 int
net_close(struct of_dev * op)108 net_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
121 static int
net_mountroot(void)122 net_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