1 /* $NetBSD: netif.c,v 1.27 2023/09/14 03:08:31 rin 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/param.h>
35 #include <sys/cdefs.h>
36 #include <sys/mount.h>
37 #ifdef _STANDALONE
38 #include <lib/libkern/libkern.h>
39 #else
40 #include <string.h>
41 #endif
42
43 #include <netinet/in.h>
44 #include <netinet/in_systm.h>
45
46 #include "stand.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("%s: called\n", __func__);
69 #endif
70 for (d = 0; d < n_netif_drivers; 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 *, void *);
78
79 int
netif_match(struct netif * nif,void * machdep_hint)80 netif_match(struct netif *nif, void *machdep_hint)
81 {
82 struct netif_driver *drv = nif->nif_driver;
83
84 #if 0
85 if (netif_debug)
86 printf("%s%d: %s (%d)\n", drv->netif_bname,
87 nif->nif_unit, __func__, nif->nif_sel);
88 #endif
89 return drv->netif_match(nif, machdep_hint);
90 }
91
92 struct netif *
netif_select(void * machdep_hint)93 netif_select(void *machdep_hint)
94 {
95 int d, u, s;
96 struct netif_driver *drv;
97 struct netif cur_if;
98 static struct netif best_if;
99 int best_val;
100 int val;
101
102 best_val = 0;
103 best_if.nif_driver = NULL;
104
105 #ifdef NETIF_DEBUG
106 if (netif_debug)
107 printf("%s: %d interfaces\n", __func__, n_netif_drivers);
108 #endif
109
110 for (d = 0; d < n_netif_drivers; d++) {
111 cur_if.nif_driver = netif_drivers[d];
112 drv = cur_if.nif_driver;
113
114 for (u = 0; u < drv->netif_nifs; u++) {
115 cur_if.nif_unit = u;
116
117 #ifdef NETIF_DEBUG
118 if (netif_debug)
119 printf("\t%s%d:", drv->netif_bname,
120 cur_if.nif_unit);
121 #endif
122
123 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
124 cur_if.nif_sel = s;
125
126 if (drv->netif_ifs[u].dif_used & (1 << s)) {
127 #ifdef NETIF_DEBUG
128 if (netif_debug)
129 printf(" [%d used]", s);
130 #endif
131 continue;
132 }
133
134 val = netif_match(&cur_if, machdep_hint);
135 #ifdef NETIF_DEBUG
136 if (netif_debug)
137 printf(" [%d -> %d]", s, val);
138 #endif
139 if (val > best_val) {
140 best_val = val;
141 best_if = cur_if;
142 }
143 }
144 #ifdef NETIF_DEBUG
145 if (netif_debug)
146 printf("\n");
147 #endif
148 }
149 }
150
151 if (best_if.nif_driver == NULL)
152 return NULL;
153
154 best_if.nif_driver->
155 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
156
157 #ifdef NETIF_DEBUG
158 if (netif_debug)
159 printf("%s: %s%d(%d) wins\n", __func__,
160 best_if.nif_driver->netif_bname,
161 best_if.nif_unit, best_if.nif_sel);
162 #endif
163 return &best_if;
164 }
165
166 int
netif_probe(struct netif * nif,void * machdep_hint)167 netif_probe(struct netif *nif, void *machdep_hint)
168 {
169 struct netif_driver *drv = nif->nif_driver;
170
171 #ifdef NETIF_DEBUG
172 if (netif_debug)
173 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__);
174 #endif
175 return drv->netif_probe(nif, machdep_hint);
176 }
177
178 void
netif_attach(struct netif * nif,struct iodesc * desc,void * machdep_hint)179 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
180 {
181 struct netif_driver *drv = nif->nif_driver;
182
183 #ifdef NETIF_DEBUG
184 if (netif_debug)
185 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__);
186 #endif
187 desc->io_netif = nif;
188 #ifdef PARANOID
189 if (drv->netif_init == NULL)
190 panic("%s%d: no netif_init support", drv->netif_bname,
191 nif->nif_unit);
192 #endif
193 drv->netif_init(desc, machdep_hint);
194 (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0,
195 sizeof(struct netif_stats));
196 }
197
198 void
netif_detach(struct netif * nif)199 netif_detach(struct netif *nif)
200 {
201 struct netif_driver *drv = nif->nif_driver;
202
203 #ifdef NETIF_DEBUG
204 if (netif_debug)
205 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__);
206 #endif
207 #ifdef PARANOID
208 if (drv->netif_end == NULL)
209 panic("%s%d: no netif_end support", drv->netif_bname,
210 nif->nif_unit);
211 #endif
212 drv->netif_end(nif);
213 }
214
215 ssize_t
netif_get(struct iodesc * desc,void * pkt,size_t len,saseconds_t timo)216 netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo)
217 {
218 struct netif *nif = desc->io_netif;
219 struct netif_driver *drv = nif->nif_driver;
220 ssize_t rv;
221
222 #ifdef NETIF_DEBUG
223 if (netif_debug)
224 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__);
225 #endif
226 #ifdef PARANOID
227 if (drv->netif_get == NULL)
228 panic("%s%d: no %s support", drv->netif_bname,
229 nif->nif_unit, __func__);
230 #endif
231 rv = drv->netif_get(desc, pkt, len, timo);
232 #ifdef NETIF_DEBUG
233 if (netif_debug)
234 printf("%s%d: %s returning %zd\n", drv->netif_bname,
235 nif->nif_unit, __func__, rv);
236 #endif
237 return rv;
238 }
239
240 ssize_t
netif_put(struct iodesc * desc,void * pkt,size_t len)241 netif_put(struct iodesc *desc, void *pkt, size_t len)
242 {
243 struct netif *nif = desc->io_netif;
244 struct netif_driver *drv = nif->nif_driver;
245 ssize_t rv;
246
247 #ifdef NETIF_DEBUG
248 if (netif_debug)
249 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__);
250 #endif
251 #ifdef PARANOID
252 if (drv->netif_put == NULL)
253 panic("%s%d: no netif_put support", drv->netif_bname,
254 nif->nif_unit);
255 #endif
256 rv = drv->netif_put(desc, pkt, len);
257 #ifdef NETIF_DEBUG
258 if (netif_debug)
259 printf("%s%d: %s returning %zd\n", drv->netif_bname,
260 nif->nif_unit, __func__, rv);
261 #endif
262 return rv;
263 }
264
265 struct iodesc *
socktodesc(int sock)266 socktodesc(int sock)
267 {
268 #if !defined(LIBSA_NO_FD_CHECKING)
269 if (sock >= SOPEN_MAX) {
270 errno = EBADF;
271 return NULL;
272 }
273 #endif
274 return &sockets[sock];
275 }
276
277 int
netif_open(void * machdep_hint)278 netif_open(void *machdep_hint)
279 {
280 int fd;
281 struct iodesc *s;
282 struct netif *nif;
283
284 /* find a free socket */
285 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
286 if (s->io_netif == (struct netif *)0)
287 goto fnd;
288 errno = EMFILE;
289 return -1;
290
291 fnd:
292 (void)memset(s, 0, sizeof(*s));
293 netif_init();
294 nif = netif_select(machdep_hint);
295 if (!nif) {
296 errno = ENXIO;
297 return -1;
298 }
299 if (netif_probe(nif, machdep_hint)) {
300 printf("%s: couldn't probe %s%d\n", __func__,
301 nif->nif_driver->netif_bname, nif->nif_unit);
302 errno = EINVAL;
303 return -1;
304 }
305 netif_attach(nif, s, machdep_hint);
306
307 return fd;
308 }
309
310 int
netif_close(int sock)311 netif_close(int sock)
312 {
313 #if !defined(LIBSA_NO_FD_CHECKING)
314 if (sock >= SOPEN_MAX) {
315 errno = EBADF;
316 return -1;
317 }
318 #endif
319 netif_detach(sockets[sock].io_netif);
320 sockets[sock].io_netif = (struct netif *)0;
321
322 return 0;
323 }
324