lib/libstand/netif.c

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