1 /* $NetBSD: netif.c,v 1.10 1997/09/06 13:57:14 drochner Exp $ */
2
3 /*
4 * Copyright (c) 1993 Adam Glass
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 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Adam Glass.
18 * 4. The name of the Author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35
36 #include <sys/param.h>
37 #include <sys/types.h>
38 #include <sys/cdefs.h>
39 #include <sys/mount.h>
40 #include <string.h>
41
42 #include <netinet/in.h>
43 #include <netinet/in_systm.h>
44
45 #include "stand.h"
46 #include "net.h"
47 #include "netif.h"
48
49 struct iodesc sockets[SOPEN_MAX];
50 #ifdef NETIF_DEBUG
51 int netif_debug = 0;
52 #endif
53
54 /*
55 * netif_init:
56 *
57 * initialize the generic network interface layer
58 */
59
60 void
netif_init(void)61 netif_init(void)
62 {
63 struct netif_driver *drv;
64 int d, i;
65
66 #ifdef NETIF_DEBUG
67 if (netif_debug)
68 printf("netif_init: called\n");
69 #endif
70 for (d = 0; netif_drivers[d]; d++) {
71 drv = netif_drivers[d];
72 for (i = 0; i < drv->netif_nifs; i++)
73 drv->netif_ifs[i].dif_used = 0;
74 }
75 }
76
77 int
netif_match(struct netif * nif,void * machdep_hint)78 netif_match(struct netif *nif, void *machdep_hint)
79 {
80 struct netif_driver *drv = nif->nif_driver;
81
82 #if NETIF_DEBUG
83 if (netif_debug)
84 printf("%s%d: netif_match (%d)\n", drv->netif_bname,
85 nif->nif_unit, nif->nif_sel);
86 #endif
87 return drv->netif_match(nif, machdep_hint);
88 }
89
90 struct netif *
netif_select(void * machdep_hint)91 netif_select(void *machdep_hint)
92 {
93 int d, u, unit_done, s;
94 struct netif_driver *drv;
95 struct netif cur_if;
96 static struct netif best_if;
97 int best_val;
98 int val;
99
100 best_val = 0;
101 best_if.nif_driver = NULL;
102
103 for (d = 0; netif_drivers[d] != NULL; d++) {
104 cur_if.nif_driver = netif_drivers[d];
105 drv = cur_if.nif_driver;
106
107 for (u = 0; u < drv->netif_nifs; u++) {
108 cur_if.nif_unit = u;
109 unit_done = 0;
110
111 #ifdef NETIF_DEBUG
112 if (netif_debug)
113 printf("\t%s%d:", drv->netif_bname,
114 cur_if.nif_unit);
115 #endif
116
117 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
118 cur_if.nif_sel = s;
119
120 if (drv->netif_ifs[u].dif_used & (1 << s)) {
121 #ifdef NETIF_DEBUG
122 if (netif_debug)
123 printf(" [%d used]", s);
124 #endif
125 continue;
126 }
127
128 val = netif_match(&cur_if, machdep_hint);
129 #ifdef NETIF_DEBUG
130 if (netif_debug)
131 printf(" [%d -> %d]", s, val);
132 #endif
133 if (val > best_val) {
134 best_val = val;
135 best_if = cur_if;
136 }
137 }
138 #ifdef NETIF_DEBUG
139 if (netif_debug)
140 printf("\n");
141 #endif
142 }
143 }
144
145 if (best_if.nif_driver == NULL)
146 return NULL;
147
148 best_if.nif_driver->
149 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
150
151 #ifdef NETIF_DEBUG
152 if (netif_debug)
153 printf("netif_select: %s%d(%d) wins\n",
154 best_if.nif_driver->netif_bname,
155 best_if.nif_unit, best_if.nif_sel);
156 #endif
157 return &best_if;
158 }
159
160 int
netif_probe(struct netif * nif,void * machdep_hint)161 netif_probe(struct netif *nif, void *machdep_hint)
162 {
163 struct netif_driver *drv = nif->nif_driver;
164
165 #ifdef NETIF_DEBUG
166 if (netif_debug)
167 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
168 #endif
169 return drv->netif_probe(nif, machdep_hint);
170 }
171
172 void
netif_attach(struct netif * nif,struct iodesc * desc,void * machdep_hint)173 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
174 {
175 struct netif_driver *drv = nif->nif_driver;
176
177 #ifdef NETIF_DEBUG
178 if (netif_debug)
179 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
180 #endif
181 desc->io_netif = nif;
182 #ifdef PARANOID
183 if (drv->netif_init == NULL)
184 panic("%s%d: no netif_init support\n", drv->netif_bname,
185 nif->nif_unit);
186 #endif
187 drv->netif_init(desc, machdep_hint);
188 bzero(drv->netif_ifs[nif->nif_unit].dif_stats,
189 sizeof(struct netif_stats));
190 }
191
192 void
netif_detach(struct netif * nif)193 netif_detach(struct netif *nif)
194 {
195 struct netif_driver *drv = nif->nif_driver;
196
197 #ifdef NETIF_DEBUG
198 if (netif_debug)
199 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
200 #endif
201 #ifdef PARANOID
202 if (drv->netif_end == NULL)
203 panic("%s%d: no netif_end support\n", drv->netif_bname,
204 nif->nif_unit);
205 #endif
206 drv->netif_end(nif);
207 }
208
209 ssize_t
netif_get(struct iodesc * desc,void ** pkt,time_t timo)210 netif_get(struct iodesc *desc, void **pkt, time_t timo)
211 {
212 #ifdef NETIF_DEBUG
213 struct netif *nif = desc->io_netif;
214 #endif
215 struct netif_driver *drv = desc->io_netif->nif_driver;
216 ssize_t rv;
217
218 #ifdef NETIF_DEBUG
219 if (netif_debug)
220 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
221 #endif
222 #ifdef PARANOID
223 if (drv->netif_get == NULL)
224 panic("%s%d: no netif_get support\n", drv->netif_bname,
225 nif->nif_unit);
226 #endif
227 rv = drv->netif_get(desc, pkt, timo);
228 #ifdef NETIF_DEBUG
229 if (netif_debug)
230 printf("%s%d: netif_get returning %d\n", drv->netif_bname,
231 nif->nif_unit, (int)rv);
232 #endif
233 return (rv);
234 }
235
236 ssize_t
netif_put(struct iodesc * desc,void * pkt,size_t len)237 netif_put(struct iodesc *desc, void *pkt, size_t len)
238 {
239 #ifdef NETIF_DEBUG
240 struct netif *nif = desc->io_netif;
241 #endif
242 struct netif_driver *drv = desc->io_netif->nif_driver;
243 ssize_t rv;
244
245 #ifdef NETIF_DEBUG
246 if (netif_debug)
247 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
248 #endif
249 #ifdef PARANOID
250 if (drv->netif_put == NULL)
251 panic("%s%d: no netif_put support\n", drv->netif_bname,
252 nif->nif_unit);
253 #endif
254 rv = drv->netif_put(desc, pkt, len);
255 #ifdef NETIF_DEBUG
256 if (netif_debug)
257 printf("%s%d: netif_put returning %d\n", drv->netif_bname,
258 nif->nif_unit, (int)rv);
259 #endif
260 return (rv);
261 }
262
263 struct iodesc *
socktodesc(int sock)264 socktodesc(int sock)
265 {
266 if (sock >= SOPEN_MAX) {
267 errno = EBADF;
268 return (NULL);
269 }
270 return (&sockets[sock]);
271 }
272
273 int
netif_open(void * machdep_hint)274 netif_open(void *machdep_hint)
275 {
276 int fd;
277 struct iodesc *s;
278 struct netif *nif;
279
280 /* find a free socket */
281 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
282 if (s->io_netif == (struct netif *)0)
283 goto fnd;
284 errno = EMFILE;
285 return (-1);
286
287 fnd:
288 bzero(s, sizeof(*s));
289 netif_init();
290 nif = netif_select(machdep_hint);
291 if (!nif)
292 panic("netboot: no interfaces left untried");
293 if (netif_probe(nif, machdep_hint)) {
294 printf("netboot: couldn't probe %s%d\n",
295 nif->nif_driver->netif_bname, nif->nif_unit);
296 errno = EINVAL;
297 return (-1);
298 }
299 netif_attach(nif, s, machdep_hint);
300
301 return (fd);
302 }
303
304 int
netif_close(int sock)305 netif_close(int sock)
306 {
307 if (sock >= SOPEN_MAX) {
308 errno = EBADF;
309 return (-1);
310 }
311 netif_detach(sockets[sock].io_netif);
312 sockets[sock].io_netif = (struct netif *)0;
313
314 return (0);
315 }
316