1 /* $NetBSD: dev_net.c,v 1.27 2019/03/31 20:08:45 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Gordon W. Ross.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * This module implements a "raw device" interface suitable for
34 * use by the stand-alone I/O library NFS code. This interface
35 * does not support any "block" access, and exists only for the
36 * purpose of initializing the network interface, getting boot
37 * parameters, and performing the NFS mount.
38 *
39 * At open time, this does:
40 *
41 * find interface - netif_open()
42 * RARP for IP address - rarp_getipaddress()
43 * RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...)
44 * RPC/mountd - nfs_mount(sock, ip, path)
45 *
46 * the root file handle from mountd is saved in a global
47 * for use by the NFS open code (NFS/lookup).
48 */
49
50 #include <sys/param.h>
51 #include <sys/socket.h>
52 #include <net/if.h>
53 #include <netinet/in.h>
54 #include <netinet/in_systm.h>
55
56 #include <lib/libkern/libkern.h>
57
58 #include "stand.h"
59 #include "net.h"
60 #include "netif.h"
61 #include "nfs.h"
62 #include "bootparam.h"
63 #include "dev_net.h"
64 #ifdef SUPPORT_BOOTP
65 #include "bootp.h"
66 #endif
67
68 extern int nfs_root_node[]; /* XXX - get from nfs_mount() */
69
70 static int netdev_sock = -1;
71 static int netdev_opens;
72
73 static int net_getparams(int);
74
75 /*
76 * Called by devopen after it sets f->f_dev to our devsw entry.
77 * This opens the low-level device and sets f->f_devdata.
78 * This is declared with variable arguments...
79 */
80 int
net_open(struct open_file * f,...)81 net_open(struct open_file *f, ...)
82 {
83 va_list ap;
84 char *devname; /* Device part of file name (or NULL). */
85 int error = 0;
86
87 va_start(ap, f);
88 devname = va_arg(ap, char *);
89 va_end(ap);
90
91 #ifdef NETIF_DEBUG
92 if (debug)
93 printf("%s\n", devname);
94 #endif
95
96 /* On first open, do netif open, mount, etc. */
97 if (netdev_opens == 0) {
98 /* Find network interface. */
99 if (netdev_sock < 0) {
100 netdev_sock = netif_open(devname);
101 if (netdev_sock < 0) {
102 printf("netif_open() failed\n");
103 return ENXIO;
104 }
105 #ifdef NETIF_DEBUG
106 if (debug)
107 printf("netif_open() succeeded\n");
108 #endif
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 printf("NFS mount error=%d\n", errno);
121 rootip.s_addr = 0;
122 fail:
123 netif_close(netdev_sock);
124 netdev_sock = -1;
125 return error;
126 }
127 #ifdef NETIF_DEBUG
128 if (debug)
129 printf("NFS mount succeeded\n");
130 #endif
131 }
132 }
133 netdev_opens++;
134 f->f_devdata = nfs_root_node;
135 return error;
136 }
137
138 int
net_close(struct open_file * f)139 net_close(struct open_file *f)
140 {
141
142 #ifdef NETIF_DEBUG
143 if (debug)
144 printf("net_close: opens=%d\n", netdev_opens);
145 #endif
146
147 /* On last close, do netif close, etc. */
148 f->f_devdata = NULL;
149 /* Extra close call? */
150 if (netdev_opens <= 0)
151 return 0;
152 netdev_opens--;
153 /* Not last close? */
154 if (netdev_opens > 0)
155 return 0;
156 rootip.s_addr = 0;
157 if (netdev_sock >= 0) {
158 #ifdef NETIF_DEBUG
159 if (debug)
160 printf("%s: calling netif_close()\n", __func__);
161 #endif
162 netif_close(netdev_sock);
163 netdev_sock = -1;
164 }
165 return 0;
166 }
167
168 int
net_ioctl(struct open_file * f,u_long cmd,void * data)169 net_ioctl(struct open_file *f, u_long cmd, void *data)
170 {
171
172 return EIO;
173 }
174
175 int
net_strategy(void * devdata,int rw,daddr_t blk,size_t size,void * buf,size_t * rsize)176 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
177 size_t *rsize)
178 {
179
180 return EIO;
181 }
182
183
184 /*
185 * Get info for NFS boot: our IP address, our hostname,
186 * server IP address, and our root path on the server.
187 * There are two ways to do this: The old, Sun way,
188 * and the more modern, BOOTP way. (RFC951, RFC1048)
189 *
190 * The default is to use the Sun bootparams RPC
191 * (because that is what the kernel will do).
192 * MD code can make try_bootp initialied data,
193 * which will override this common definition.
194 */
195 #ifdef SUPPORT_BOOTP
196 int try_bootp;
197 #endif
198
199 static int
net_getparams(int sock)200 net_getparams(int sock)
201 {
202 char buf[MAXHOSTNAMELEN];
203 n_long smask;
204
205 #ifdef SUPPORT_BOOTP
206 /*
207 * Try to get boot info using BOOTP. If we succeed, then
208 * the server IP address, gateway, and root path will all
209 * be initialized. If any remain uninitialized, we will
210 * use RARP and RPC/bootparam (the Sun way) to get them.
211 */
212 if (try_bootp)
213 bootp(sock);
214 if (myip.s_addr != 0)
215 return 0;
216 #ifdef NETIF_DEBUG
217 if (debug)
218 printf("BOOTP failed, trying RARP/RPC...\n");
219 #endif
220 #endif
221
222 /*
223 * Use RARP to get our IP address. This also sets our
224 * netmask to the "natural" default for our address.
225 */
226 if (rarp_getipaddress(sock)) {
227 printf("RARP failed\n");
228 return EIO;
229 }
230 #ifdef NETIF_DEBUG
231 if (debug)
232 printf("client addr: %s\n", inet_ntoa(myip));
233 #endif
234
235 /* Get our hostname, server IP address, gateway. */
236 if (bp_whoami(sock)) {
237 printf("bootparam/whoami RPC failed\n");
238 return EIO;
239 }
240 #ifdef NETIF_DEBUG
241 if (debug)
242 printf("client name: %s\n", hostname);
243 #endif
244
245 /*
246 * Ignore the gateway from whoami (unreliable).
247 * Use the "gateway" parameter instead.
248 */
249 smask = 0;
250 gateip.s_addr = 0;
251 if (bp_getfile(sock, "gateway", &gateip, buf)) {
252 printf("%s: gateway bootparam missing\n", __func__);
253 } else {
254 /* Got it! Parse the netmask. */
255 smask = inet_addr(buf);
256 }
257 if (smask) {
258 netmask = smask;
259 #ifdef NETIF_DEBUG
260 if (debug)
261 printf("subnet mask: %s\n", intoa(netmask));
262 #endif
263 }
264 #ifdef NETIF_DEBUG
265 if (debug)
266 if (gateip.s_addr)
267 printf("net gateway: %s\n", inet_ntoa(gateip));
268 #endif
269
270 /* Get the root server and pathname. */
271 if (bp_getfile(sock, "root", &rootip, rootpath)) {
272 printf("bootparam/getfile RPC failed\n");
273 return EIO;
274 }
275
276 #ifdef NETIF_DEBUG
277 if (debug) {
278 printf("server addr: %s\n", inet_ntoa(rootip));
279 printf("server path: %s\n", rootpath);
280 }
281 #endif
282
283 return 0;
284 }
285