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 /*-
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 <sys/stdarg.h>
53
54 #include <net/if.h>
55 #include <netinet/in.h>
56 #include <netinet/in_systm.h>
57
58 #include <stand.h>
59 #include <stddef.h>
60 #include <string.h>
61 #include <net.h>
62 #include <netif.h>
63 #include <bootp.h>
64 #include <bootparam.h>
65
66 #include "dev_net.h"
67 #include "bootstrap.h"
68
69 #ifdef NETIF_DEBUG
70 int debug = 0;
71 #endif
72
73 static char *netdev_name;
74 static int netdev_sock = -1;
75 static int netdev_opens;
76
77 static int net_init(void);
78 static int net_open(struct open_file *, ...);
79 static int net_close(struct open_file *);
80 static void net_cleanup(void);
81 static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *);
82 static int net_print(int);
83
84 static int net_getparams(int sock);
85
86 struct devsw netdev = {
87 .dv_name = "net",
88 .dv_type = DEVT_NET,
89 .dv_init = net_init,
90 .dv_strategy = net_strategy,
91 .dv_open = net_open,
92 .dv_close = net_close,
93 .dv_ioctl = noioctl,
94 .dv_print = net_print,
95 .dv_cleanup = net_cleanup,
96 };
97
98 static struct uri_scheme {
99 const char *scheme;
100 int proto;
101 } uri_schemes[] = {
102 { "tftp:/", NET_TFTP },
103 { "nfs:/", NET_NFS },
104 };
105
106 static int
net_init(void)107 net_init(void)
108 {
109
110 return (0);
111 }
112
113 /*
114 * Called by devopen after it sets f->f_dev to our devsw entry.
115 * This opens the low-level device and sets dev->d_opendata.
116 * This is declared with variable arguments...
117 */
118 static int
net_open(struct open_file * f,...)119 net_open(struct open_file *f, ...)
120 {
121 struct iodesc *d;
122 va_list args;
123 struct devdesc *dev;
124 const char *devname; /* Device part of file name (or NULL). */
125 int error = 0;
126
127 va_start(args, f);
128 dev = va_arg(args, struct devdesc *);
129 va_end(args);
130
131 devname = dev->d_dev->dv_name;
132 /* Before opening another interface, close the previous one first. */
133 if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
134 net_cleanup();
135
136 /* On first open, do netif open, mount, etc. */
137 if (netdev_opens == 0) {
138 /* Find network interface. */
139 if (netdev_sock < 0) {
140 netdev_sock = netif_open(dev);
141 if (netdev_sock < 0) {
142 printf("%s: netif_open() failed\n", __func__);
143 return (ENXIO);
144 }
145 netdev_name = strdup(devname);
146 #ifdef NETIF_DEBUG
147 if (debug)
148 printf("%s: netif_open() succeeded\n",
149 __func__);
150 #endif
151 }
152 /*
153 * If network params were not set by netif_open(), try to get
154 * them via bootp, rarp, etc.
155 */
156 if (rootip.s_addr == 0) {
157 /* Get root IP address, and path, etc. */
158 error = net_getparams(netdev_sock);
159 if (error) {
160 /* getparams makes its own noise */
161 free(netdev_name);
162 netif_close(netdev_sock);
163 netdev_sock = -1;
164 return (error);
165 }
166 }
167 /*
168 * Set the variables required by the kernel's nfs_diskless
169 * mechanism. This is the minimum set of variables required to
170 * mount a root filesystem without needing to obtain additional
171 * info from bootp or other sources.
172 */
173 d = socktodesc(netdev_sock);
174 setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1);
175 setenv("boot.netif.ip", inet_ntoa(myip), 1);
176 setenv("boot.netif.netmask", intoa(netmask), 1);
177 setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
178 setenv("boot.netif.server", inet_ntoa(rootip), 1);
179 if (netproto == NET_TFTP) {
180 setenv("boot.tftproot.server", inet_ntoa(rootip), 1);
181 setenv("boot.tftproot.path", rootpath, 1);
182 } else if (netproto == NET_NFS) {
183 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
184 setenv("boot.nfsroot.path", rootpath, 1);
185 }
186 if (intf_mtu != 0) {
187 char mtu[16];
188 snprintf(mtu, sizeof(mtu), "%u", intf_mtu);
189 setenv("boot.netif.mtu", mtu, 1);
190 }
191
192 }
193 netdev_opens++;
194 dev->d_opendata = &netdev_sock;
195 return (error);
196 }
197
198 static int
net_close(struct open_file * f)199 net_close(struct open_file *f)
200 {
201 struct devdesc *dev;
202
203 #ifdef NETIF_DEBUG
204 if (debug)
205 printf("%s: opens=%d\n", __func__, netdev_opens);
206 #endif
207
208 dev = f->f_devdata;
209 dev->d_opendata = NULL;
210
211 return (0);
212 }
213
214 static void
net_cleanup(void)215 net_cleanup(void)
216 {
217
218 if (netdev_sock >= 0) {
219 #ifdef NETIF_DEBUG
220 if (debug)
221 printf("%s: calling netif_close()\n", __func__);
222 #endif
223 rootip.s_addr = 0;
224 free(netdev_name);
225 netif_close(netdev_sock);
226 netdev_sock = -1;
227 }
228 }
229
230 static int
net_strategy(void * devdata,int rw,daddr_t blk,size_t size,char * buf,size_t * rsize)231 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
232 size_t *rsize)
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
252 int try_bootp = 1;
253 #endif
254
255 extern n_long ip_convertaddr(char *p);
256
257 static int
net_getparams(int sock)258 net_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);
272 if (myip.s_addr != 0)
273 goto exit;
274 #ifdef NETIF_DEBUG
275 if (debug)
276 printf("%s: BOOTP failed, trying RARP/RPC...\n", __func__);
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("%s: RARP failed\n", __func__);
286 return (EIO);
287 }
288 printf("%s: client addr: %s\n", __func__, inet_ntoa(myip));
289
290 /* Get our hostname, server IP address, gateway. */
291 if (bp_whoami(sock)) {
292 printf("%s: bootparam/whoami RPC failed\n", __func__);
293 return (EIO);
294 }
295 #ifdef NETIF_DEBUG
296 if (debug)
297 printf("%s: client name: %s\n", __func__, 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("%s: subnet mask: %s\n", __func__,
315 intoa(netmask));
316 #endif
317 }
318 #ifdef NETIF_DEBUG
319 if (gateip.s_addr && debug)
320 printf("%s: net gateway: %s\n", __func__, inet_ntoa(gateip));
321 #endif
322
323 /* Get the root server and pathname. */
324 if (bp_getfile(sock, "root", &rootip, rootpath)) {
325 printf("%s: bootparam/getfile RPC failed\n", __func__);
326 return (EIO);
327 }
328 exit:
329 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
330 rootip.s_addr = rootaddr;
331
332 #ifdef NETIF_DEBUG
333 if (debug) {
334 printf("%s: server addr: %s\n", __func__, inet_ntoa(rootip));
335 printf("%s: server path: %s\n", __func__, rootpath);
336 }
337 #endif
338
339 return (0);
340 }
341
342 static int
net_print(int verbose)343 net_print(int verbose)
344 {
345 struct netif_driver *drv;
346 int i, d, cnt;
347 int ret = 0;
348
349 if (netif_drivers[0] == NULL)
350 return (ret);
351
352 printf("%s devices:", netdev.dv_name);
353 if ((ret = pager_output("\n")) != 0)
354 return (ret);
355
356 cnt = 0;
357 for (d = 0; netif_drivers[d]; d++) {
358 drv = netif_drivers[d];
359 for (i = 0; i < drv->netif_nifs; i++) {
360 printf("\t%s%d:", netdev.dv_name, cnt++);
361 if (verbose) {
362 printf(" (%s%d)", drv->netif_bname,
363 drv->netif_ifs[i].dif_unit);
364 }
365 if ((ret = pager_output("\n")) != 0)
366 return (ret);
367 }
368 }
369 return (ret);
370 }
371
372 /*
373 * Parses the rootpath if present
374 *
375 * The rootpath format can be in the form
376 * <scheme>://ip/path
377 * <scheme>:/path
378 *
379 * For compatibility with previous behaviour it also accepts as an NFS scheme
380 * ip:/path
381 * /path
382 *
383 * If an ip is set it returns it in network byte order.
384 * The default scheme defined in the global netproto, if not set it defaults to
385 * NFS.
386 * It leaves just the pathname in the global rootpath.
387 */
388 uint32_t
net_parse_rootpath(void)389 net_parse_rootpath(void)
390 {
391 n_long addr = htonl(INADDR_NONE);
392 size_t i;
393 char ip[FNAME_SIZE];
394 char *ptr, *val;
395
396 netproto = NET_NONE;
397
398 for (i = 0; i < nitems(uri_schemes); i++) {
399 if (strncmp(rootpath, uri_schemes[i].scheme,
400 strlen(uri_schemes[i].scheme)) != 0)
401 continue;
402
403 netproto = uri_schemes[i].proto;
404 break;
405 }
406 ptr = rootpath;
407 /* Fallback for compatibility mode */
408 if (netproto == NET_NONE) {
409 netproto = NET_NFS;
410 (void)strsep(&ptr, ":");
411 if (ptr != NULL) {
412 addr = inet_addr(rootpath);
413 bcopy(ptr, rootpath, strlen(ptr) + 1);
414 }
415 } else {
416 ptr += strlen(uri_schemes[i].scheme);
417 if (*ptr == '/') {
418 /* we are in the form <scheme>://, we do expect an ip */
419 ptr++;
420 /*
421 * XXX when http will be there we will need to check for
422 * a port, but right now we do not need it yet
423 */
424 val = strchr(ptr, '/');
425 if (val != NULL) {
426 snprintf(ip, sizeof(ip), "%.*s",
427 (int)((uintptr_t)val - (uintptr_t)ptr),
428 ptr);
429 addr = inet_addr(ip);
430 bcopy(val, rootpath, strlen(val) + 1);
431 }
432 } else {
433 ptr--;
434 bcopy(ptr, rootpath, strlen(ptr) + 1);
435 }
436 }
437
438 return (addr);
439 }
440