1 /*
2 * Copyright (c) 1997 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Gordon W. Ross.
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 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
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 <machine/stdarg.h>
51 #include <sys/param.h>
52 #include <sys/socket.h>
53 #include <net/if.h>
54 #include <netinet/in.h>
55 #include <netinet/in_systm.h>
56
57 #include <stand.h>
58 #include <stddef.h>
59 #include <string.h>
60 #include <net.h>
61 #include <netif.h>
62 #include <bootp.h>
63 #include <bootparam.h>
64
65 #include "dev_net.h"
66 #include "bootstrap.h"
67
68 #ifdef NETIF_DEBUG
69 int debug = 0;
70 #endif
71
72 static char *netdev_name;
73 static int netdev_sock = -1;
74 static int netdev_opens;
75
76 static int net_init(void);
77 static int net_open(struct open_file *, ...);
78 static int net_close(struct open_file *);
79 static void net_cleanup(void);
80 static int net_strategy(void *, int, daddr_t, size_t, char *, size_t *);
81 static int net_print(int);
82
83 static int net_getparams(int sock);
84
85 struct devsw netdev = {
86 "net",
87 DEVT_NET,
88 net_init,
89 net_strategy,
90 net_open,
91 net_close,
92 noioctl,
93 net_print,
94 net_cleanup
95 };
96
97 static struct uri_scheme {
98 const char *scheme;
99 int proto;
100 } uri_schemes[] = {
101 { "tftp:/", NET_TFTP },
102 { "nfs:/", NET_NFS },
103 };
104
105 static int
net_init(void)106 net_init(void)
107 {
108
109 return (0);
110 }
111
112 /*
113 * Called by devopen after it sets f->f_dev to our devsw entry.
114 * This opens the low-level device and sets f->f_devdata.
115 * This is declared with variable arguments...
116 */
117 static int
net_open(struct open_file * f,...)118 net_open(struct open_file *f, ...)
119 {
120 struct iodesc *d;
121 va_list args;
122 char *devname; /* Device part of file name (or NULL). */
123 int error = 0;
124
125 va_start(args, f);
126 devname = va_arg(args, char *);
127 va_end(args);
128
129 /* Before opening another interface, close the previous one first. */
130 if (netdev_sock >= 0 && strcmp(devname, netdev_name) != 0)
131 net_cleanup();
132
133 /* On first open, do netif open, mount, etc. */
134 if (netdev_opens == 0) {
135 /* Find network interface. */
136 if (netdev_sock < 0) {
137 netdev_sock = netif_open(devname);
138 if (netdev_sock < 0) {
139 printf("net_open: netif_open() failed\n");
140 return (ENXIO);
141 }
142 netdev_name = strdup(devname);
143 #ifdef NETIF_DEBUG
144 if (debug)
145 printf("net_open: netif_open() succeeded\n");
146 #endif
147 }
148 /*
149 * If network params were not set by netif_open(), try to get
150 * them via bootp, rarp, etc.
151 */
152 if (rootip.s_addr == 0) {
153 /* Get root IP address, and path, etc. */
154 error = net_getparams(netdev_sock);
155 if (error) {
156 /* getparams makes its own noise */
157 free(netdev_name);
158 netif_close(netdev_sock);
159 netdev_sock = -1;
160 return (error);
161 }
162 }
163 /*
164 * Set the variables required by the kernel's nfs_diskless
165 * mechanism. This is the minimum set of variables required to
166 * mount a root filesystem without needing to obtain additional
167 * info from bootp or other sources.
168 */
169 d = socktodesc(netdev_sock);
170 setenv("boot.netif.hwaddr", ether_sprintf(d->myea), 1);
171 setenv("boot.netif.ip", inet_ntoa(myip), 1);
172 setenv("boot.netif.netmask", intoa(netmask), 1);
173 setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
174 setenv("boot.netif.server", inet_ntoa(rootip), 1);
175 if (netproto == NET_TFTP) {
176 setenv("boot.tftproot.server", inet_ntoa(rootip), 1);
177 setenv("boot.tftproot.path", rootpath, 1);
178 } else {
179 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
180 setenv("boot.nfsroot.path", rootpath, 1);
181 }
182 if (intf_mtu != 0) {
183 char mtu[16];
184 snprintf(mtu, sizeof (mtu), "%u", intf_mtu);
185 setenv("boot.netif.mtu", mtu, 1);
186 }
187 }
188 netdev_opens++;
189 f->f_devdata = &netdev_sock;
190 return (error);
191 }
192
193 static int
net_close(struct open_file * f)194 net_close(struct open_file *f)
195 {
196
197 #ifdef NETIF_DEBUG
198 if (debug)
199 printf("net_close: opens=%d\n", netdev_opens);
200 #endif
201
202 f->f_devdata = NULL;
203
204 return (0);
205 }
206
207 static void
net_cleanup(void)208 net_cleanup(void)
209 {
210
211 if (netdev_sock >= 0) {
212 #ifdef NETIF_DEBUG
213 if (debug)
214 printf("net_cleanup: calling netif_close()\n");
215 #endif
216 rootip.s_addr = 0;
217 free(netdev_name);
218 netif_close(netdev_sock);
219 netdev_sock = -1;
220 }
221 }
222
223 static int
net_strategy(void * devdata,int rw,daddr_t blk,size_t size,char * buf,size_t * rsize)224 net_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
225 size_t *rsize)
226 {
227
228 return (EIO);
229 }
230
231 /*
232 * Get info for NFS boot: our IP address, our hostname,
233 * server IP address, and our root path on the server.
234 * There are two ways to do this: The old, Sun way,
235 * and the more modern, BOOTP/DHCP way. (RFC951, RFC1048)
236 */
237
238 extern n_long ip_convertaddr(char *p);
239
240 static int
net_getparams(int sock)241 net_getparams(int sock)
242 {
243 char buf[MAXHOSTNAMELEN];
244 n_long rootaddr, smask;
245
246 /*
247 * Try to get boot info using BOOTP/DHCP. If we succeed, then
248 * the server IP address, gateway, and root path will all
249 * be initialized. If any remain uninitialized, we will
250 * use RARP and RPC/bootparam (the Sun way) to get them.
251 */
252 bootp(sock);
253 if (myip.s_addr != 0)
254 goto exit;
255 #ifdef NETIF_DEBUG
256 if (debug)
257 printf("net_open: BOOTP failed, trying RARP/RPC...\n");
258 #endif
259
260 /*
261 * Use RARP to get our IP address. This also sets our
262 * netmask to the "natural" default for our address.
263 */
264 if (rarp_getipaddress(sock)) {
265 printf("net_open: RARP failed\n");
266 return (EIO);
267 }
268 printf("net_open: client addr: %s\n", inet_ntoa(myip));
269
270 /* Get our hostname, server IP address, gateway. */
271 if (bp_whoami(sock)) {
272 printf("net_open: bootparam/whoami RPC failed\n");
273 return (EIO);
274 }
275 #ifdef NETIF_DEBUG
276 if (debug)
277 printf("net_open: client name: %s\n", hostname);
278 #endif
279
280 /*
281 * Ignore the gateway from whoami (unreliable).
282 * Use the "gateway" parameter instead.
283 */
284 smask = 0;
285 gateip.s_addr = 0;
286 if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
287 /* Got it! Parse the netmask. */
288 smask = ip_convertaddr(buf);
289 }
290 if (smask) {
291 netmask = smask;
292 #ifdef NETIF_DEBUG
293 if (debug)
294 printf("net_open: subnet mask: %s\n", intoa(netmask));
295 #endif
296 }
297 #ifdef NETIF_DEBUG
298 if (gateip.s_addr && debug)
299 printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
300 #endif
301
302 /* Get the root server and pathname. */
303 if (bp_getfile(sock, "root", &rootip, rootpath)) {
304 printf("net_open: bootparam/getfile RPC failed\n");
305 return (EIO);
306 }
307 exit:
308 if ((rootaddr = net_parse_rootpath()) != INADDR_NONE)
309 rootip.s_addr = rootaddr;
310
311 #ifdef NETIF_DEBUG
312 if (debug) {
313 printf("net_open: server addr: %s\n", inet_ntoa(rootip));
314 printf("net_open: server path: %s\n", rootpath);
315 }
316 #endif
317
318 return (0);
319 }
320
321 static int
net_print(int verbose)322 net_print(int verbose)
323 {
324 struct netif_driver *drv;
325 int i, d, cnt;
326 int ret = 0;
327
328 if (netif_drivers[0] == NULL)
329 return (ret);
330
331 printf("%s devices:", netdev.dv_name);
332 if ((ret = pager_output("\n")) != 0)
333 return (ret);
334
335 cnt = 0;
336 for (d = 0; netif_drivers[d]; d++) {
337 drv = netif_drivers[d];
338 for (i = 0; i < drv->netif_nifs; i++) {
339 printf("\t%s%d:", netdev.dv_name, cnt++);
340 if (verbose) {
341 printf(" (%s%d)", drv->netif_bname,
342 drv->netif_ifs[i].dif_unit);
343 }
344 if ((ret = pager_output("\n")) != 0)
345 return (ret);
346 }
347 }
348 return (ret);
349 }
350
351 /*
352 * Parses the rootpath if present
353 *
354 * The rootpath format can be in the form
355 * <scheme>://IPv4/path
356 * <scheme>:/path
357 *
358 * For compatibility with previous behaviour it also accepts as an NFS scheme
359 * IPv4:/path
360 * /path
361 *
362 * If an IPv4 address has been specified, it will be stripped out and passed
363 * out as the return value of this function in network byte order.
364 *
365 * If no global default scheme has been specified and no scheme has been
366 * specified, we will assume that this is an NFS URL.
367 *
368 * The pathname will be stored in the global variable rootpath.
369 */
370 uint32_t
net_parse_rootpath(void)371 net_parse_rootpath(void)
372 {
373 n_long addr = htonl(INADDR_NONE);
374 size_t i;
375 char ip[FNAME_SIZE];
376 char *ptr, *val;
377
378 netproto = NET_NONE;
379
380 for (i = 0; i < nitems(uri_schemes); i++) {
381 if (strncmp(rootpath, uri_schemes[i].scheme,
382 strlen(uri_schemes[i].scheme)) != 0)
383 continue;
384
385 netproto = uri_schemes[i].proto;
386 break;
387 }
388 ptr = rootpath;
389 /* Fallback for compatibility mode */
390 if (netproto == NET_NONE) {
391 netproto = NET_NFS;
392 (void) strsep(&ptr, ":");
393 if (ptr != NULL) {
394 addr = inet_addr(rootpath);
395 bcopy(ptr, rootpath, strlen(ptr) + 1);
396 }
397 } else {
398 ptr += strlen(uri_schemes[i].scheme);
399 if (*ptr == '/') {
400 /* we are in the form <scheme>://, we do expect an ip */
401 ptr++;
402 /*
403 * XXX when http will be there we will need to check for
404 * a port, but right now we do not need it yet.
405 * Also will need rework for IPv6.
406 */
407 val = strchr(ptr, '/');
408 if (val != NULL) {
409 snprintf(ip, sizeof (ip), "%.*s",
410 (int)((uintptr_t)val - (uintptr_t)ptr),
411 ptr);
412 addr = inet_addr(ip);
413 if (addr == htonl(INADDR_NONE)) {
414 printf("Bad IP address: %s\n", ip);
415 }
416 bcopy(val, rootpath, strlen(val) + 1);
417 }
418 } else {
419 ptr--;
420 bcopy(ptr, rootpath, strlen(ptr) + 1);
421 }
422 }
423
424 return (addr);
425 }
426