/* $NetBSD: netif.c,v 1.26.30.1 2024/06/21 11:05:16 martin Exp $ */ /* * Copyright (c) 1993 Adam Glass * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Adam Glass. * 4. The name of the Author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #ifdef _STANDALONE #include #else #include #endif #include #include #include "stand.h" #include "netif.h" struct iodesc sockets[SOPEN_MAX]; #ifdef NETIF_DEBUG int netif_debug = 0; #endif /* * netif_init: * * initialize the generic network interface layer */ void netif_init(void) { struct netif_driver *drv; int d, i; #ifdef NETIF_DEBUG if (netif_debug) printf("%s: called\n", __func__); #endif for (d = 0; d < n_netif_drivers; d++) { drv = netif_drivers[d]; for (i = 0; i < drv->netif_nifs; i++) drv->netif_ifs[i].dif_used = 0; } } int netif_match(struct netif *, void *); int netif_match(struct netif *nif, void *machdep_hint) { struct netif_driver *drv = nif->nif_driver; #if 0 if (netif_debug) printf("%s%d: %s (%d)\n", drv->netif_bname, nif->nif_unit, __func__, nif->nif_sel); #endif return drv->netif_match(nif, machdep_hint); } struct netif * netif_select(void *machdep_hint) { int d, u, s; struct netif_driver *drv; struct netif cur_if; static struct netif best_if; int best_val; int val; best_val = 0; best_if.nif_driver = NULL; #ifdef NETIF_DEBUG if (netif_debug) printf("%s: %d interfaces\n", __func__, n_netif_drivers); #endif for (d = 0; d < n_netif_drivers; d++) { cur_if.nif_driver = netif_drivers[d]; drv = cur_if.nif_driver; for (u = 0; u < drv->netif_nifs; u++) { cur_if.nif_unit = u; #ifdef NETIF_DEBUG if (netif_debug) printf("\t%s%d:", drv->netif_bname, cur_if.nif_unit); #endif for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { cur_if.nif_sel = s; if (drv->netif_ifs[u].dif_used & (1 << s)) { #ifdef NETIF_DEBUG if (netif_debug) printf(" [%d used]", s); #endif continue; } val = netif_match(&cur_if, machdep_hint); #ifdef NETIF_DEBUG if (netif_debug) printf(" [%d -> %d]", s, val); #endif if (val > best_val) { best_val = val; best_if = cur_if; } } #ifdef NETIF_DEBUG if (netif_debug) printf("\n"); #endif } } if (best_if.nif_driver == NULL) return NULL; best_if.nif_driver-> netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); #ifdef NETIF_DEBUG if (netif_debug) printf("%s: %s%d(%d) wins\n", __func__, best_if.nif_driver->netif_bname, best_if.nif_unit, best_if.nif_sel); #endif return &best_if; } int netif_probe(struct netif *nif, void *machdep_hint) { struct netif_driver *drv = nif->nif_driver; #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); #endif return drv->netif_probe(nif, machdep_hint); } void netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint) { struct netif_driver *drv = nif->nif_driver; #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); #endif desc->io_netif = nif; #ifdef PARANOID if (drv->netif_init == NULL) panic("%s%d: no netif_init support", drv->netif_bname, nif->nif_unit); #endif drv->netif_init(desc, machdep_hint); (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0, sizeof(struct netif_stats)); } void netif_detach(struct netif *nif) { struct netif_driver *drv = nif->nif_driver; #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); #endif #ifdef PARANOID if (drv->netif_end == NULL) panic("%s%d: no netif_end support", drv->netif_bname, nif->nif_unit); #endif drv->netif_end(nif); } ssize_t netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo) { struct netif *nif = desc->io_netif; struct netif_driver *drv = nif->nif_driver; ssize_t rv; #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); #endif #ifdef PARANOID if (drv->netif_get == NULL) panic("%s%d: no %s support", drv->netif_bname, nif->nif_unit, __func__); #endif rv = drv->netif_get(desc, pkt, len, timo); #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s returning %zd\n", drv->netif_bname, nif->nif_unit, __func__, rv); #endif return rv; } ssize_t netif_put(struct iodesc *desc, void *pkt, size_t len) { struct netif *nif = desc->io_netif; struct netif_driver *drv = nif->nif_driver; ssize_t rv; #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); #endif #ifdef PARANOID if (drv->netif_put == NULL) panic("%s%d: no netif_put support", drv->netif_bname, nif->nif_unit); #endif rv = drv->netif_put(desc, pkt, len); #ifdef NETIF_DEBUG if (netif_debug) printf("%s%d: %s returning %zd\n", drv->netif_bname, nif->nif_unit, __func__, rv); #endif return rv; } struct iodesc * socktodesc(int sock) { #if !defined(LIBSA_NO_FD_CHECKING) if (sock >= SOPEN_MAX) { errno = EBADF; return NULL; } #endif return &sockets[sock]; } int netif_open(void *machdep_hint) { int fd; struct iodesc *s; struct netif *nif; /* find a free socket */ for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) if (s->io_netif == (struct netif *)0) goto fnd; errno = EMFILE; return -1; fnd: (void)memset(s, 0, sizeof(*s)); netif_init(); nif = netif_select(machdep_hint); if (!nif) { errno = ENXIO; return -1; } if (netif_probe(nif, machdep_hint)) { printf("%s: couldn't probe %s%d\n", __func__, nif->nif_driver->netif_bname, nif->nif_unit); errno = EINVAL; return -1; } netif_attach(nif, s, machdep_hint); return fd; } int netif_close(int sock) { #if !defined(LIBSA_NO_FD_CHECKING) if (sock >= SOPEN_MAX) { errno = EBADF; return -1; } #endif netif_detach(sockets[sock].io_netif); sockets[sock].io_netif = (struct netif *)0; return 0; }