1 /* $NetBSD: dev_net.c,v 1.2 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/nfs.h>
57
58 #include <lib/libkern/libkern.h>
59
60 #include <lib/libsa/dev_net.h>
61
62 #ifndef SUN_BOOTPARAMS
63 void bootp(int);
64 #endif
65
66 extern int debug;
67 extern int nfs_root_node[]; /* XXX - get from nfs_mount() */
68
69 /*
70 * Local things...
71 */
72 static int netdev_sock = -1;
73 static int netdev_opens;
74
75 int net_getparams(int);
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 * This is declared with variable arguments...
81 */
82 int
net_open(struct open_file * f,...)83 net_open(struct open_file *f, ...)
84 {
85 va_list ap;
86 char *devname; /* Device part of file name (or NULL). */
87 int error = 0;
88
89 va_start(ap, f);
90 devname = va_arg(ap, char*);
91 va_end(ap);
92
93 #ifdef NETIF_DEBUG
94 if (debug)
95 printf("net_open: %s\n", devname);
96 #endif
97
98 /* On first open, do netif open, mount, etc. */
99 if (netdev_opens == 0) {
100 /* Find network interface. */
101 if (netdev_sock < 0) {
102 netdev_sock = netif_open(devname);
103 if (netdev_sock < 0) {
104 printf("net_open: netif_open() failed\n");
105 return (ENXIO);
106 }
107 if (debug)
108 printf("net_open: netif_open() succeeded\n");
109 }
110 if (rootip.s_addr == 0) {
111 /* Get root IP address, and path, etc. */
112 error = net_getparams(netdev_sock);
113 if (error) {
114 /* getparams makes its own noise */
115 goto fail;
116 }
117 /* Get the NFS file handle (mountd). */
118 error = nfs_mount(netdev_sock, rootip, rootpath);
119 if (error) {
120 error = errno;
121 printf("net_open: NFS mount error=%d\n", error);
122 rootip.s_addr = 0;
123 fail:
124 netif_close(netdev_sock);
125 netdev_sock = -1;
126 return (error);
127 }
128 if (debug)
129 printf("net_open: NFS mount succeeded\n");
130 }
131 }
132 netdev_opens++;
133 f->f_devdata = nfs_root_node;
134 return (error);
135 }
136
137 int
net_close(struct open_file * f)138 net_close(struct open_file *f)
139 {
140
141 #ifdef NETIF_DEBUG
142 if (debug)
143 printf("net_close: opens=%d\n", netdev_opens);
144 #endif
145
146 /* On last close, do netif close, etc. */
147 f->f_devdata = NULL;
148 /* Extra close call? */
149 if (netdev_opens <= 0)
150 return (0);
151 netdev_opens--;
152 /* Not last close? */
153 if (netdev_opens > 0)
154 return(0);
155 rootip.s_addr = 0;
156 if (netdev_sock >= 0) {
157 if (debug)
158 printf("net_close: calling netif_close()\n");
159 netif_close(netdev_sock);
160 netdev_sock = -1;
161 }
162 return (0);
163 }
164
165 int
net_ioctl(struct open_file * a,u_long b,void * c)166 net_ioctl(struct open_file *a, u_long b, void *c)
167 {
168 return EIO;
169 }
170
171 int
net_strategy(void * a,int b,daddr_t c,size_t d,void * e,size_t * f)172 net_strategy(void *a, int b, daddr_t c, size_t d, void *e, size_t *f)
173 {
174 return EIO;
175 }
176
177 int
net_getparams(int sock)178 net_getparams(int sock)
179 {
180 /*
181 * Get info for NFS boot: our IP address, our hostname,
182 * server IP address, and our root path on the server.
183 * There are two ways to do this: The old, Sun way,
184 * and the more modern, BOOTP way. (RFC951, RFC1048)
185 */
186
187 #ifdef SUN_BOOTPARAMS
188 /* Get our IP address. (rarp.c) */
189 if (rarp_getipaddress(sock)) {
190 printf("net_open: RARP failed\n");
191 return (EIO);
192 }
193 #else /* BOOTPARAMS */
194 /*
195 * Get boot info using BOOTP. (RFC951, RFC1048)
196 * This also gets the server IP address, gateway,
197 * root path, etc.
198 */
199 bootp(sock);
200 if (myip.s_addr == 0) {
201 printf("net_open: BOOTP failed\n");
202 return (EIO);
203 }
204 #endif /* BOOTPARAMS */
205
206 printf("boot: client addr: %s\n", inet_ntoa(myip));
207
208 #ifdef SUN_BOOTPARAMS
209 /* Get our hostname, server IP address, gateway. */
210 if (bp_whoami(sock)) {
211 printf("net_open: bootparam/whoami RPC failed\n");
212 return (EIO);
213 }
214 #endif /* BOOTPARAMS */
215
216 printf("boot: client name: %s\n", hostname);
217 if (gateip.s_addr) {
218 printf("boot: subnet mask: %s\n", intoa(netmask));
219 printf("boot: net gateway: %s\n", inet_ntoa(gateip));
220 }
221
222 #ifdef SUN_BOOTPARAMS
223 /* Get the root pathname. */
224 if (bp_getfile(sock, "root", &rootip, rootpath)) {
225 printf("net_open: bootparam/getfile RPC failed\n");
226 return (EIO);
227 }
228 #endif /* BOOTPARAMS */
229
230 printf("boot: server addr: %s\n", inet_ntoa(rootip));
231 printf("boot: server path: %s\n", rootpath);
232
233 return (0);
234 }
235