dev_net.c revision 301056 
1/*	$NetBSD: dev_net.c,v 1.23 2008/04/28 20:24:06 martin 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#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/sys/boot/common/dev_net.c 301056 2016-05-31 17:01:54Z ian $");
34
35/*-
36 * This module implements a "raw device" interface suitable for
37 * use by the stand-alone I/O library NFS code.  This interface
38 * does not support any "block" access, and exists only for the
39 * purpose of initializing the network interface, getting boot
40 * parameters, and performing the NFS mount.
41 *
42 * At open time, this does:
43 *
44 * find interface      - netif_open()
45 * RARP for IP address - rarp_getipaddress()
46 * RPC/bootparams      - callrpc(d, RPC_BOOTPARAMS, ...)
47 * RPC/mountd          - nfs_mount(sock, ip, path)
48 *
49 * the root file handle from mountd is saved in a global
50 * for use by the NFS open code (NFS/lookup).
51 */
52
53#include <machine/stdarg.h>
54#include <sys/param.h>
55#include <sys/socket.h>
56#include <net/if.h>
57#include <netinet/in.h>
58#include <netinet/in_systm.h>
59
60#include <stand.h>
61#include <string.h>
62#include <net.h>
63#include <netif.h>
64#include <bootp.h>
65#include <bootparam.h>
66
67#include "dev_net.h"
68#include "bootstrap.h"
69
70#ifdef	NETIF_DEBUG
71int debug = 0;
72#endif
73
74static char *netdev_name;
75static int netdev_sock = -1;
76static int netdev_opens;
77
78static int	net_init(void);
79static int	net_open(struct open_file *, ...);
80static int	net_close(struct open_file *);
81static void	net_cleanup(void);
82static int	net_strategy();
83static void	net_print(int);
84
85static int net_getparams(int sock);
86
87struct devsw netdev = {
88	"net",
89	DEVT_NET,
90	net_init,
91	net_strategy,
92	net_open,
93	net_close,
94	noioctl,
95	net_print,
96	net_cleanup
97};
98
99static int
100net_init(void)
101{
102
103	return (0);
104}
105
106/*
107 * Called by devopen after it sets f->f_dev to our devsw entry.
108 * This opens the low-level device and sets f->f_devdata.
109 * This is declared with variable arguments...
110 */
111static int
112net_open(struct open_file *f, ...)
113{
114	char temp[FNAME_SIZE];
115	struct iodesc *d;
116	va_list args;
117	char *devname;		/* Device part of file name (or NULL). */
118	int error = 0;
119
120	va_start(args, f);
121	devname = va_arg(args, char*);
122	va_end(args);
123
124#ifdef	NETIF_OPEN_CLOSE_ONCE
125	/* Before opening another interface, close the previous one first. */
126	if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
127		net_cleanup();
128#endif
129
130	/* On first open, do netif open, mount, etc. */
131	if (netdev_opens == 0) {
132		/* Find network interface. */
133		if (netdev_sock < 0) {
134			netdev_sock = netif_open(devname);
135			if (netdev_sock < 0) {
136				printf("net_open: netif_open() failed\n");
137				return (ENXIO);
138			}
139			netdev_name = strdup(devname);
140#ifdef	NETIF_DEBUG
141			if (debug)
142				printf("net_open: netif_open() succeeded\n");
143#endif
144		}
145		/*
146		 * If network params were not set by netif_open(), try to get
147		 * them via bootp, rarp, etc.
148		 */
149		if (rootip.s_addr == 0) {
150			/* Get root IP address, and path, etc. */
151			error = net_getparams(netdev_sock);
152			if (error) {
153				/* getparams makes its own noise */
154				free(netdev_name);
155				netif_close(netdev_sock);
156				netdev_sock = -1;
157				return (error);
158			}
159		}
160		/*
161		 * Set the variables required by the kernel's nfs_diskless
162		 * mechanism.  This is the minimum set of variables required to
163		 * mount a root filesystem without needing to obtain additional
164		 * info from bootp or other sources.
165		 */
166		d = socktodesc(netdev_sock);
167		sprintf(temp, "%6D", d->myea, ":");
168		setenv("boot.netif.hwaddr", temp, 1);
169		setenv("boot.netif.ip", inet_ntoa(myip), 1);
170		setenv("boot.netif.netmask", intoa(netmask), 1);
171		setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
172		setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
173		setenv("boot.nfsroot.path", rootpath, 1);
174		if (intf_mtu != 0) {
175			char mtu[16];
176			sprintf(mtu, "%u", intf_mtu);
177			setenv("boot.netif.mtu", mtu, 1);
178		}
179
180	}
181	netdev_opens++;
182	f->f_devdata = &netdev_sock;
183	return (error);
184}
185
186static int
187net_close(struct open_file *f)
188{
189
190#ifdef	NETIF_DEBUG
191	if (debug)
192		printf("net_close: opens=%d\n", netdev_opens);
193#endif
194
195	f->f_devdata = NULL;
196
197#ifndef	NETIF_OPEN_CLOSE_ONCE
198	/* Extra close call? */
199	if (netdev_opens <= 0)
200		return (0);
201	netdev_opens--;
202	/* Not last close? */
203	if (netdev_opens > 0)
204		return (0);
205	/* On last close, do netif close, etc. */
206#ifdef	NETIF_DEBUG
207	if (debug)
208		printf("net_close: calling net_cleanup()\n");
209#endif
210	net_cleanup();
211#endif
212	return (0);
213}
214
215static void
216net_cleanup(void)
217{
218
219	if (netdev_sock >= 0) {
220#ifdef	NETIF_DEBUG
221		if (debug)
222			printf("net_cleanup: calling netif_close()\n");
223#endif
224		rootip.s_addr = 0;
225		free(netdev_name);
226		netif_close(netdev_sock);
227		netdev_sock = -1;
228	}
229}
230
231static int
232net_strategy()
233{
234
235	return (EIO);
236}
237
238#define SUPPORT_BOOTP
239
240/*
241 * Get info for NFS boot: our IP address, our hostname,
242 * server IP address, and our root path on the server.
243 * There are two ways to do this:  The old, Sun way,
244 * and the more modern, BOOTP way. (RFC951, RFC1048)
245 *
246 * The default is to use the Sun bootparams RPC
247 * (because that is what the kernel will do).
248 * MD code can make try_bootp initialied data,
249 * which will override this common definition.
250 */
251#ifdef	SUPPORT_BOOTP
252int try_bootp = 1;
253#endif
254
255extern n_long ip_convertaddr(char *p);
256
257static int
258net_getparams(int sock)
259{
260	char buf[MAXHOSTNAMELEN];
261	n_long rootaddr, smask;
262
263#ifdef	SUPPORT_BOOTP
264	/*
265	 * Try to get boot info using BOOTP.  If we succeed, then
266	 * the server IP address, gateway, and root path will all
267	 * be initialized.  If any remain uninitialized, we will
268	 * use RARP and RPC/bootparam (the Sun way) to get them.
269	 */
270	if (try_bootp)
271		bootp(sock, BOOTP_NONE);
272	if (myip.s_addr != 0)
273		goto exit;
274#ifdef	NETIF_DEBUG
275	if (debug)
276		printf("net_open: BOOTP failed, trying RARP/RPC...\n");
277#endif
278#endif
279
280	/*
281	 * Use RARP to get our IP address.  This also sets our
282	 * netmask to the "natural" default for our address.
283	 */
284	if (rarp_getipaddress(sock)) {
285		printf("net_open: RARP failed\n");
286		return (EIO);
287	}
288	printf("net_open: client addr: %s\n", inet_ntoa(myip));
289
290	/* Get our hostname, server IP address, gateway. */
291	if (bp_whoami(sock)) {
292		printf("net_open: bootparam/whoami RPC failed\n");
293		return (EIO);
294	}
295#ifdef	NETIF_DEBUG
296	if (debug)
297		printf("net_open: client name: %s\n", hostname);
298#endif
299
300	/*
301	 * Ignore the gateway from whoami (unreliable).
302	 * Use the "gateway" parameter instead.
303	 */
304	smask = 0;
305	gateip.s_addr = 0;
306	if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
307		/* Got it!  Parse the netmask. */
308		smask = ip_convertaddr(buf);
309	}
310	if (smask) {
311		netmask = smask;
312#ifdef	NETIF_DEBUG
313		if (debug)
314			printf("net_open: subnet mask: %s\n", intoa(netmask));
315#endif
316	}
317#ifdef	NETIF_DEBUG
318	if (gateip.s_addr && debug)
319		printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
320#endif
321
322	/* Get the root server and pathname. */
323	if (bp_getfile(sock, "root", &rootip, rootpath)) {
324		printf("net_open: bootparam/getfile RPC failed\n");
325		return (EIO);
326	}
327exit:
328	if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
329		rootip.s_addr = rootaddr;
330
331#ifdef	NETIF_DEBUG
332	if (debug) {
333		printf("net_open: server addr: %s\n", inet_ntoa(rootip));
334		printf("net_open: server path: %s\n", rootpath);
335	}
336#endif
337
338	return (0);
339}
340
341static void
342net_print(int verbose)
343{
344	struct netif_driver *drv;
345	int i, d, cnt;
346
347	cnt = 0;
348	for (d = 0; netif_drivers[d]; d++) {
349		drv = netif_drivers[d];
350		for (i = 0; i < drv->netif_nifs; i++) {
351			printf("\t%s%d:", "net", cnt++);
352			if (verbose)
353				printf(" (%s%d)", drv->netif_bname,
354				    drv->netif_ifs[i].dif_unit);
355		}
356	}
357	printf("\n");
358}
359
360/*
361 * Strip the server's address off of the rootpath if present and return it in
362 * network byte order, leaving just the pathname part in the global rootpath.
363 */
364uint32_t
365net_parse_rootpath()
366{
367	int i;
368	n_long addr = INADDR_NONE;
369
370	for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++)
371		if (rootpath[i] == ':')
372			break;
373	if (i && i != FNAME_SIZE && rootpath[i] == ':') {
374		rootpath[i++] = '\0';
375		addr = inet_addr(&rootpath[0]);
376		bcopy(&rootpath[i], rootpath, strlen(&rootpath[i])+1);
377	}
378	return (addr);
379}
380