netif.c revision 346476 
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__FBSDID("$FreeBSD: stable/11/stand/libsa/netif.c 346476 2019-04-21 03:36:05Z kevans $");
36
37#include <sys/param.h>
38#include <sys/types.h>
39#include <sys/cdefs.h>
40#include <sys/mount.h>
41#include <string.h>
42
43#include <netinet/in.h>
44#include <netinet/in_systm.h>
45
46#include "stand.h"
47#include "net.h"
48#include "netif.h"
49
50struct iodesc sockets[SOPEN_MAX];
51#ifdef NETIF_DEBUG
52int netif_debug = 0;
53#endif
54
55/*
56 * netif_init:
57 *
58 * initialize the generic network interface layer
59 */
60
61void
62netif_init(void)
63{
64	struct netif_driver *drv;
65	int d, i;
66
67#ifdef NETIF_DEBUG
68	if (netif_debug)
69		printf("netif_init: called\n");
70#endif
71	for (d = 0; netif_drivers[d]; d++) {
72		drv = netif_drivers[d];
73		for (i = 0; i < drv->netif_nifs; i++)
74			drv->netif_ifs[i].dif_used = 0;
75	}
76}
77
78int
79netif_match(struct netif *nif, void *machdep_hint)
80{
81	struct netif_driver *drv = nif->nif_driver;
82
83#if NETIF_DEBUG
84	if (netif_debug)
85		printf("%s%d: netif_match (%d)\n", drv->netif_bname,
86		    nif->nif_unit, nif->nif_sel);
87#endif
88	return drv->netif_match(nif, machdep_hint);
89}
90
91struct netif *
92netif_select(void *machdep_hint)
93{
94	int d, u, unit_done, s;
95	struct netif_driver *drv;
96	struct netif cur_if;
97	static struct netif best_if;
98	int best_val;
99	int val;
100
101	best_val = 0;
102	best_if.nif_driver = NULL;
103
104	for (d = 0; netif_drivers[d] != NULL; d++) {
105		cur_if.nif_driver = netif_drivers[d];
106		drv = cur_if.nif_driver;
107
108		for (u = 0; u < drv->netif_nifs; u++) {
109			cur_if.nif_unit = u;
110			unit_done = 0;
111
112#ifdef NETIF_DEBUG
113			if (netif_debug)
114				printf("\t%s%d:", drv->netif_bname,
115				    cur_if.nif_unit);
116#endif
117
118			for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
119				cur_if.nif_sel = s;
120
121				if (drv->netif_ifs[u].dif_used & (1 << s)) {
122#ifdef NETIF_DEBUG
123					if (netif_debug)
124						printf(" [%d used]", s);
125#endif
126					continue;
127				}
128
129				val = netif_match(&cur_if, machdep_hint);
130#ifdef NETIF_DEBUG
131				if (netif_debug)
132					printf(" [%d -> %d]", s, val);
133#endif
134				if (val > best_val) {
135					best_val = val;
136					best_if = cur_if;
137				}
138			}
139#ifdef NETIF_DEBUG
140			if (netif_debug)
141				printf("\n");
142#endif
143		}
144	}
145
146	if (best_if.nif_driver == NULL)
147		return NULL;
148
149	best_if.nif_driver->
150	    netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
151
152#ifdef NETIF_DEBUG
153	if (netif_debug)
154		printf("netif_select: %s%d(%d) wins\n",
155			best_if.nif_driver->netif_bname,
156			best_if.nif_unit, best_if.nif_sel);
157#endif
158	return &best_if;
159}
160
161int
162netif_probe(struct netif *nif, void *machdep_hint)
163{
164	struct netif_driver *drv = nif->nif_driver;
165
166#ifdef NETIF_DEBUG
167	if (netif_debug)
168		printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
169#endif
170	return drv->netif_probe(nif, machdep_hint);
171}
172
173void
174netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
175{
176	struct netif_driver *drv = nif->nif_driver;
177
178#ifdef NETIF_DEBUG
179	if (netif_debug)
180		printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
181#endif
182	desc->io_netif = nif;
183#ifdef PARANOID
184	if (drv->netif_init == NULL)
185		panic("%s%d: no netif_init support", drv->netif_bname,
186		    nif->nif_unit);
187#endif
188	drv->netif_init(desc, machdep_hint);
189	bzero(drv->netif_ifs[nif->nif_unit].dif_stats,
190	    sizeof(struct netif_stats));
191}
192
193void
194netif_detach(struct netif *nif)
195{
196	struct netif_driver *drv = nif->nif_driver;
197
198#ifdef NETIF_DEBUG
199	if (netif_debug)
200		printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
201#endif
202#ifdef PARANOID
203	if (drv->netif_end == NULL)
204		panic("%s%d: no netif_end support", drv->netif_bname,
205		    nif->nif_unit);
206#endif
207	drv->netif_end(nif);
208}
209
210ssize_t
211netif_get(struct iodesc *desc, void **pkt, time_t timo)
212{
213#ifdef NETIF_DEBUG
214	struct netif *nif = desc->io_netif;
215#endif
216	struct netif_driver *drv = desc->io_netif->nif_driver;
217	ssize_t rv;
218
219#ifdef NETIF_DEBUG
220	if (netif_debug)
221		printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
222#endif
223#ifdef PARANOID
224	if (drv->netif_get == NULL)
225		panic("%s%d: no netif_get support", drv->netif_bname,
226		    nif->nif_unit);
227#endif
228	rv = drv->netif_get(desc, pkt, timo);
229#ifdef NETIF_DEBUG
230	if (netif_debug)
231		printf("%s%d: netif_get returning %d\n", drv->netif_bname,
232		    nif->nif_unit, (int)rv);
233#endif
234	return (rv);
235}
236
237ssize_t
238netif_put(struct iodesc *desc, void *pkt, size_t len)
239{
240#ifdef NETIF_DEBUG
241	struct netif *nif = desc->io_netif;
242#endif
243	struct netif_driver *drv = desc->io_netif->nif_driver;
244	ssize_t rv;
245
246#ifdef NETIF_DEBUG
247	if (netif_debug)
248		printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
249#endif
250#ifdef PARANOID
251	if (drv->netif_put == NULL)
252		panic("%s%d: no netif_put support", drv->netif_bname,
253		    nif->nif_unit);
254#endif
255	rv = drv->netif_put(desc, pkt, len);
256#ifdef NETIF_DEBUG
257	if (netif_debug)
258		printf("%s%d: netif_put returning %d\n", drv->netif_bname,
259		    nif->nif_unit, (int)rv);
260#endif
261	return (rv);
262}
263
264struct iodesc *
265socktodesc(int sock)
266{
267	if (sock >= SOPEN_MAX) {
268		errno = EBADF;
269		return (NULL);
270	}
271	return (&sockets[sock]);
272}
273
274int
275netif_open(void *machdep_hint)
276{
277	int fd;
278	struct iodesc *s;
279	struct netif *nif;
280
281	/* find a free socket */
282	for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
283		if (s->io_netif == (struct netif *)0)
284			goto fnd;
285	errno = EMFILE;
286	return (-1);
287
288fnd:
289	bzero(s, sizeof(*s));
290	netif_init();
291	nif = netif_select(machdep_hint);
292	if (!nif)
293		panic("netboot: no interfaces left untried");
294	if (netif_probe(nif, machdep_hint)) {
295		printf("netboot: couldn't probe %s%d\n",
296		    nif->nif_driver->netif_bname, nif->nif_unit);
297		errno = EINVAL;
298		return (-1);
299	}
300	netif_attach(nif, s, machdep_hint);
301
302	return (fd);
303}
304
305int
306netif_close(int sock)
307{
308	if (sock >= SOPEN_MAX) {
309		errno = EBADF;
310		return (-1);
311	}
312	netif_detach(sockets[sock].io_netif);
313	sockets[sock].io_netif = (struct netif *)0;
314
315	return (0);
316}
317