317 lines
7.3 KiB
C
317 lines
7.3 KiB
C
/* $NetBSD: netif.c,v 1.10 1997/09/06 13:57:14 drochner Exp $ */
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/*
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* Copyright (c) 1993 Adam Glass
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Adam Glass.
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* 4. The name of the Author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/cdefs.h>
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#include <sys/mount.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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struct iodesc sockets[SOPEN_MAX];
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#ifdef NETIF_DEBUG
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int netif_debug = 0;
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#endif
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/*
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* netif_init:
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*
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* initialize the generic network interface layer
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*/
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void
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netif_init(void)
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{
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struct netif_driver *drv;
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int d, i;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("netif_init: called\n");
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#endif
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for (d = 0; netif_drivers[d]; d++) {
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drv = netif_drivers[d];
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for (i = 0; i < drv->netif_nifs; i++)
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drv->netif_ifs[i].dif_used = 0;
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}
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}
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int
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netif_match(struct netif *nif, void *machdep_hint)
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{
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struct netif_driver *drv = nif->nif_driver;
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#if NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_match (%d)\n", drv->netif_bname,
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nif->nif_unit, nif->nif_sel);
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#endif
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return drv->netif_match(nif, machdep_hint);
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}
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struct netif *
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netif_select(void *machdep_hint)
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{
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int d, u, unit_done, s;
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struct netif_driver *drv;
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struct netif cur_if;
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static struct netif best_if;
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int best_val;
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int val;
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best_val = 0;
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best_if.nif_driver = NULL;
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for (d = 0; netif_drivers[d] != NULL; d++) {
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cur_if.nif_driver = netif_drivers[d];
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drv = cur_if.nif_driver;
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for (u = 0; u < drv->netif_nifs; u++) {
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cur_if.nif_unit = u;
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unit_done = 0;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("\t%s%d:", drv->netif_bname,
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cur_if.nif_unit);
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#endif
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for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
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cur_if.nif_sel = s;
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if (drv->netif_ifs[u].dif_used & (1 << s)) {
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf(" [%d used]", s);
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#endif
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continue;
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}
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val = netif_match(&cur_if, machdep_hint);
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf(" [%d -> %d]", s, val);
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#endif
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if (val > best_val) {
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best_val = val;
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best_if = cur_if;
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}
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}
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("\n");
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#endif
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}
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}
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if (best_if.nif_driver == NULL)
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return NULL;
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best_if.nif_driver->
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netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("netif_select: %s%d(%d) wins\n",
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best_if.nif_driver->netif_bname,
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best_if.nif_unit, best_if.nif_sel);
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#endif
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return &best_if;
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}
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int
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netif_probe(struct netif *nif, void *machdep_hint)
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{
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struct netif_driver *drv = nif->nif_driver;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
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#endif
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return drv->netif_probe(nif, machdep_hint);
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}
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void
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netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
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{
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struct netif_driver *drv = nif->nif_driver;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
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#endif
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desc->io_netif = nif;
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#ifdef PARANOID
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if (drv->netif_init == NULL)
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panic("%s%d: no netif_init support", drv->netif_bname,
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nif->nif_unit);
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#endif
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drv->netif_init(desc, machdep_hint);
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bzero(drv->netif_ifs[nif->nif_unit].dif_stats,
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sizeof(struct netif_stats));
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}
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void
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netif_detach(struct netif *nif)
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{
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struct netif_driver *drv = nif->nif_driver;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
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#endif
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#ifdef PARANOID
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if (drv->netif_end == NULL)
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panic("%s%d: no netif_end support", drv->netif_bname,
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nif->nif_unit);
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#endif
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drv->netif_end(nif);
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}
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ssize_t
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netif_get(struct iodesc *desc, void **pkt, time_t timo)
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{
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#ifdef NETIF_DEBUG
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struct netif *nif = desc->io_netif;
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#endif
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struct netif_driver *drv = desc->io_netif->nif_driver;
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ssize_t rv;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
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#endif
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#ifdef PARANOID
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if (drv->netif_get == NULL)
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panic("%s%d: no netif_get support", drv->netif_bname,
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nif->nif_unit);
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#endif
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rv = drv->netif_get(desc, pkt, timo);
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_get returning %d\n", drv->netif_bname,
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nif->nif_unit, (int)rv);
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#endif
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return (rv);
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}
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ssize_t
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netif_put(struct iodesc *desc, void *pkt, size_t len)
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{
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#ifdef NETIF_DEBUG
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struct netif *nif = desc->io_netif;
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#endif
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struct netif_driver *drv = desc->io_netif->nif_driver;
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ssize_t rv;
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
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#endif
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#ifdef PARANOID
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if (drv->netif_put == NULL)
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panic("%s%d: no netif_put support", drv->netif_bname,
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nif->nif_unit);
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#endif
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rv = drv->netif_put(desc, pkt, len);
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#ifdef NETIF_DEBUG
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if (netif_debug)
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printf("%s%d: netif_put returning %d\n", drv->netif_bname,
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nif->nif_unit, (int)rv);
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#endif
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return (rv);
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}
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struct iodesc *
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socktodesc(int sock)
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{
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if (sock >= SOPEN_MAX) {
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errno = EBADF;
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return (NULL);
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}
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return (&sockets[sock]);
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}
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int
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netif_open(void *machdep_hint)
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{
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int fd;
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struct iodesc *s;
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struct netif *nif;
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/* find a free socket */
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for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
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if (s->io_netif == (struct netif *)0)
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goto fnd;
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errno = EMFILE;
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return (-1);
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fnd:
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bzero(s, sizeof(*s));
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netif_init();
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nif = netif_select(machdep_hint);
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if (!nif)
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panic("netboot: no interfaces left untried");
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if (netif_probe(nif, machdep_hint)) {
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printf("netboot: couldn't probe %s%d\n",
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nif->nif_driver->netif_bname, nif->nif_unit);
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errno = EINVAL;
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return (-1);
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}
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netif_attach(nif, s, machdep_hint);
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return (fd);
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}
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int
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netif_close(int sock)
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{
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if (sock >= SOPEN_MAX) {
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errno = EBADF;
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return (-1);
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}
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netif_detach(sockets[sock].io_netif);
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sockets[sock].io_netif = (struct netif *)0;
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return (0);
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}
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