lib/libstand/netif.c

   1 /*      $NetBSD: netif.c,v 1.10 1997/09/06 13:57:14 drochner Exp $      */
   2 /* $DragonFly: src/lib/libstand/netif.c,v 1.3 2005/12/11 02:27:26 swildner Exp $                                                        */
   3
   4 /*
   5  * Copyright (c) 1993 Adam Glass
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Adam Glass.
  19  * 4. The name of the Author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/cdefs.h>
  38 #include <sys/mount.h>
  39 #include <string.h>
  40
  41 #include <netinet/in.h>
  42 #include <netinet/in_systm.h>
  43
  44 #include "stand.h"
  45 #include "net.h"
  46 #include "netif.h"
  47
  48 struct iodesc sockets[SOPEN_MAX];
  49 #ifdef NETIF_DEBUG
  50 int netif_debug = 0;
  51 #endif
  52
  53 /*
  54  * netif_init:
  55  *
  56  * initialize the generic network interface layer
  57  */
  58
  59 void
  60 netif_init(void)
  61 {
  62         struct netif_driver *drv;
  63         int d, i;
  64
  65 #ifdef NETIF_DEBUG
  66         if (netif_debug)
  67                 printf("netif_init: called\n");
  68 #endif
  69         for (d = 0; netif_drivers[d]; d++) {
  70                 drv = netif_drivers[d];
  71                 for (i = 0; i < drv->netif_nifs; i++)
  72                         drv->netif_ifs[i].dif_used = 0;
  73         }
  74 }
  75
  76 int
  77 netif_match(struct netif *nif, void *machdep_hint)
  78 {
  79         struct netif_driver *drv = nif->nif_driver;
  80
  81 #if 0
  82         if (netif_debug)
  83                 printf("%s%d: netif_match (%d)\n", drv->netif_bname,
  84                     nif->nif_unit, nif->nif_sel);
  85 #endif
  86         return drv->netif_match(nif, machdep_hint);
  87 }
  88
  89 struct netif *
  90 netif_select(void *machdep_hint)
  91 {
  92         int d, u, unit_done, s;
  93         struct netif_driver *drv;
  94         struct netif cur_if;
  95         static struct netif best_if;
  96         int best_val;
  97         int val;
  98
  99         best_val = 0;
 100         best_if.nif_driver = NULL;
 101
 102         for (d = 0; netif_drivers[d] != NULL; d++) {
 103                 cur_if.nif_driver = netif_drivers[d];
 104                 drv = cur_if.nif_driver;
 105
 106                 for (u = 0; u < drv->netif_nifs; u++) {
 107                         cur_if.nif_unit = u;
 108                         unit_done = 0;
 109
 110 #ifdef NETIF_DEBUG
 111                         if (netif_debug)
 112                                 printf("\t%s%d:", drv->netif_bname,
 113                                     cur_if.nif_unit);
 114 #endif
 115
 116                         for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
 117                                 cur_if.nif_sel = s;
 118
 119                                 if (drv->netif_ifs[u].dif_used & (1 << s)) {
 120 #ifdef NETIF_DEBUG
 121                                         if (netif_debug)
 122                                                 printf(" [%d used]", s);
 123 #endif
 124                                         continue;
 125                                 }
 126
 127                                 val = netif_match(&cur_if, machdep_hint);
 128 #ifdef NETIF_DEBUG
 129                                 if (netif_debug)
 130                                         printf(" [%d -> %d]", s, val);
 131 #endif
 132                                 if (val > best_val) {
 133                                         best_val = val;
 134                                         best_if = cur_if;
 135                                 }
 136                         }
 137 #ifdef NETIF_DEBUG
 138                         if (netif_debug)
 139                                 printf("\n");
 140 #endif
 141                 }
 142         }
 143
 144         if (best_if.nif_driver == NULL)
 145                 return NULL;
 146
 147         best_if.nif_driver->
 148             netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
 149
 150 #ifdef NETIF_DEBUG
 151         if (netif_debug)
 152                 printf("netif_select: %s%d(%d) wins\n",
 153                         best_if.nif_driver->netif_bname,
 154                         best_if.nif_unit, best_if.nif_sel);
 155 #endif
 156         return &best_if;
 157 }
 158
 159 int
 160 netif_probe(struct netif *nif, void *machdep_hint)
 161 {
 162         struct netif_driver *drv = nif->nif_driver;
 163
 164 #ifdef NETIF_DEBUG
 165         if (netif_debug)
 166                 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
 167 #endif
 168         return drv->netif_probe(nif, machdep_hint);
 169 }
 170
 171 void
 172 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
 173 {
 174         struct netif_driver *drv = nif->nif_driver;
 175
 176 #ifdef NETIF_DEBUG
 177         if (netif_debug)
 178                 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
 179 #endif
 180         desc->io_netif = nif;
 181 #ifdef PARANOID
 182         if (drv->netif_init == NULL)
 183                 panic("%s%d: no netif_init support\n", drv->netif_bname,
 184                     nif->nif_unit);
 185 #endif
 186         drv->netif_init(desc, machdep_hint);
 187         bzero(drv->netif_ifs[nif->nif_unit].dif_stats,
 188             sizeof(struct netif_stats));
 189 }
 190
 191 void
 192 netif_detach(struct netif *nif)
 193 {
 194         struct netif_driver *drv = nif->nif_driver;
 195
 196 #ifdef NETIF_DEBUG
 197         if (netif_debug)
 198                 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
 199 #endif
 200 #ifdef PARANOID
 201         if (drv->netif_end == NULL)
 202                 panic("%s%d: no netif_end support\n", drv->netif_bname,
 203                     nif->nif_unit);
 204 #endif
 205         drv->netif_end(nif);
 206 }
 207
 208 ssize_t
 209 netif_get(struct iodesc *desc, void *pkt, size_t len, time_t timo)
 210 {
 211 #ifdef NETIF_DEBUG
 212         struct netif *nif = desc->io_netif;
 213 #endif
 214         struct netif_driver *drv = desc->io_netif->nif_driver;
 215         ssize_t rv;
 216
 217 #ifdef NETIF_DEBUG
 218         if (netif_debug)
 219                 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
 220 #endif
 221 #ifdef PARANOID
 222         if (drv->netif_get == NULL)
 223                 panic("%s%d: no netif_get support\n", drv->netif_bname,
 224                     nif->nif_unit);
 225 #endif
 226         rv = drv->netif_get(desc, pkt, len, timo);
 227 #ifdef NETIF_DEBUG
 228         if (netif_debug)
 229                 printf("%s%d: netif_get returning %d\n", drv->netif_bname,
 230                     nif->nif_unit, (int)rv);
 231 #endif
 232         return rv;
 233 }
 234
 235 ssize_t
 236 netif_put(struct iodesc *desc, void *pkt, size_t len)
 237 {
 238 #ifdef NETIF_DEBUG
 239         struct netif *nif = desc->io_netif;
 240 #endif
 241         struct netif_driver *drv = desc->io_netif->nif_driver;
 242         ssize_t rv;
 243
 244 #ifdef NETIF_DEBUG
 245         if (netif_debug)
 246                 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
 247 #endif
 248 #ifdef PARANOID
 249         if (drv->netif_put == NULL)
 250                 panic("%s%d: no netif_put support\n", drv->netif_bname,
 251                     nif->nif_unit);
 252 #endif
 253         rv = drv->netif_put(desc, pkt, len);
 254 #ifdef NETIF_DEBUG
 255         if (netif_debug)
 256                 printf("%s%d: netif_put returning %d\n", drv->netif_bname,
 257                     nif->nif_unit, (int)rv);
 258 #endif
 259         return rv;
 260 }
 261
 262 struct iodesc *
 263 socktodesc(int sock)
 264 {
 265         if (sock >= SOPEN_MAX) {
 266                 errno = EBADF;
 267                 return (NULL);
 268         }
 269         return (&sockets[sock]);
 270 }
 271
 272 int
 273 netif_open(void *machdep_hint)
 274 {
 275         int fd;
 276         struct iodesc *s;
 277         struct netif *nif;
 278
 279         /* find a free socket */
 280         for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
 281                 if (s->io_netif == (struct netif *)0)
 282                         goto fnd;
 283         errno = EMFILE;
 284         return (-1);
 285
 286 fnd:
 287         bzero(s, sizeof(*s));
 288         netif_init();
 289         nif = netif_select(machdep_hint);
 290         if (!nif)
 291                 panic("netboot: no interfaces left untried");
 292         if (netif_probe(nif, machdep_hint)) {
 293                 printf("netboot: couldn't probe %s%d\n",
 294                     nif->nif_driver->netif_bname, nif->nif_unit);
 295                 errno = EINVAL;
 296                 return(-1);
 297         }
 298         netif_attach(nif, s, machdep_hint);
 299
 300         return(fd);
 301 }
 302
 303 int
 304 netif_close(int sock)
 305 {
 306         if (sock >= SOPEN_MAX) {
 307                 errno = EBADF;
 308                 return(-1);
 309         }
 310         netif_detach(sockets[sock].io_netif);
 311         sockets[sock].io_netif = (struct netif *)0;
 312
 313         return(0);
 314 }