usr/src/boot/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/cdefs.h>
  35
  36 #include <sys/param.h>
  37 #include <sys/types.h>
  38 #include <sys/cdefs.h>
  39 #include <sys/mount.h>
  40 #include <string.h>
  41
  42 #include <netinet/in.h>
  43 #include <netinet/in_systm.h>
  44
  45 #include "stand.h"
  46 #include "net.h"
  47 #include "netif.h"
  48
  49 struct iodesc sockets[SOPEN_MAX];
  50 #ifdef NETIF_DEBUG
  51 int netif_debug = 0;
  52 #endif
  53
  54 /*
  55  * netif_init:
  56  *
  57  * initialize the generic network interface layer
  58  */
  59
  60 void
  61 netif_init(void)
  62 {
  63         struct netif_driver *drv;
  64         int d, i;
  65
  66 #ifdef NETIF_DEBUG
  67         if (netif_debug)
  68                 printf("netif_init: called\n");
  69 #endif
  70         for (d = 0; netif_drivers[d]; d++) {
  71                 drv = netif_drivers[d];
  72                 for (i = 0; i < drv->netif_nifs; i++)
  73                         drv->netif_ifs[i].dif_used = 0;
  74         }
  75 }
  76
  77 int
  78 netif_match(struct netif *nif, void *machdep_hint)
  79 {
  80         struct netif_driver *drv = nif->nif_driver;
  81
  82 #if NETIF_DEBUG
  83         if (netif_debug)
  84                 printf("%s%d: netif_match (%d)\n", drv->netif_bname,
  85                     nif->nif_unit, nif->nif_sel);
  86 #endif
  87         return drv->netif_match(nif, machdep_hint);
  88 }
  89
  90 struct netif *
  91 netif_select(void *machdep_hint)
  92 {
  93         int d, u, s;
  94         struct netif_driver *drv;
  95         struct netif cur_if;
  96         static struct netif best_if;
  97         int best_val;
  98         int val;
  99
 100         best_val = 0;
 101         best_if.nif_driver = NULL;
 102
 103         for (d = 0; netif_drivers[d] != NULL; d++) {
 104                 cur_if.nif_driver = netif_drivers[d];
 105                 drv = cur_if.nif_driver;
 106
 107                 for (u = 0; u < drv->netif_nifs; u++) {
 108                         cur_if.nif_unit = u;
 109 #ifdef NETIF_DEBUG
 110                         if (netif_debug)
 111                                 printf("\t%s%d:", drv->netif_bname,
 112                                     cur_if.nif_unit);
 113 #endif
 114
 115                         for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
 116                                 cur_if.nif_sel = s;
 117
 118                                 if (drv->netif_ifs[u].dif_used & (1 << s)) {
 119 #ifdef NETIF_DEBUG
 120                                         if (netif_debug)
 121                                                 printf(" [%d used]", s);
 122 #endif
 123                                         continue;
 124                                 }
 125
 126                                 val = netif_match(&cur_if, machdep_hint);
 127 #ifdef NETIF_DEBUG
 128                                 if (netif_debug)
 129                                         printf(" [%d -> %d]", s, val);
 130 #endif
 131                                 if (val > best_val) {
 132                                         best_val = val;
 133                                         best_if = cur_if;
 134                                 }
 135                         }
 136 #ifdef NETIF_DEBUG
 137                         if (netif_debug)
 138                                 printf("\n");
 139 #endif
 140                 }
 141         }
 142
 143         if (best_if.nif_driver == NULL)
 144                 return NULL;
 145
 146         best_if.nif_driver->
 147             netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
 148
 149 #ifdef NETIF_DEBUG
 150         if (netif_debug)
 151                 printf("netif_select: %s%d(%d) wins\n",
 152                         best_if.nif_driver->netif_bname,
 153                         best_if.nif_unit, best_if.nif_sel);
 154 #endif
 155         return &best_if;
 156 }
 157
 158 int
 159 netif_probe(struct netif *nif, void *machdep_hint)
 160 {
 161         struct netif_driver *drv = nif->nif_driver;
 162
 163 #ifdef NETIF_DEBUG
 164         if (netif_debug)
 165                 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
 166 #endif
 167         return drv->netif_probe(nif, machdep_hint);
 168 }
 169
 170 void
 171 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
 172 {
 173         struct netif_driver *drv = nif->nif_driver;
 174
 175 #ifdef NETIF_DEBUG
 176         if (netif_debug)
 177                 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
 178 #endif
 179         desc->io_netif = nif;
 180 #ifdef PARANOID
 181         if (drv->netif_init == NULL)
 182                 panic("%s%d: no netif_init support\n", drv->netif_bname,
 183                     nif->nif_unit);
 184 #endif
 185         drv->netif_init(desc, machdep_hint);
 186         bzero(drv->netif_ifs[nif->nif_unit].dif_stats,
 187             sizeof(struct netif_stats));
 188 }
 189
 190 void
 191 netif_detach(struct netif *nif)
 192 {
 193         struct netif_driver *drv = nif->nif_driver;
 194
 195 #ifdef NETIF_DEBUG
 196         if (netif_debug)
 197                 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
 198 #endif
 199 #ifdef PARANOID
 200         if (drv->netif_end == NULL)
 201                 panic("%s%d: no netif_end support\n", drv->netif_bname,
 202                     nif->nif_unit);
 203 #endif
 204         drv->netif_end(nif);
 205 }
 206
 207 ssize_t
 208 netif_get(struct iodesc *desc, void **pkt, time_t timo)
 209 {
 210 #ifdef NETIF_DEBUG
 211         struct netif *nif = desc->io_netif;
 212 #endif
 213         struct netif_driver *drv = desc->io_netif->nif_driver;
 214         ssize_t rv;
 215
 216 #ifdef NETIF_DEBUG
 217         if (netif_debug)
 218                 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
 219 #endif
 220 #ifdef PARANOID
 221         if (drv->netif_get == NULL)
 222                 panic("%s%d: no netif_get support\n", drv->netif_bname,
 223                     nif->nif_unit);
 224 #endif
 225         rv = drv->netif_get(desc, pkt, timo);
 226 #ifdef NETIF_DEBUG
 227         if (netif_debug)
 228                 printf("%s%d: netif_get returning %d\n", drv->netif_bname,
 229                     nif->nif_unit, (int)rv);
 230 #endif
 231         return (rv);
 232 }
 233
 234 ssize_t
 235 netif_put(struct iodesc *desc, void *pkt, size_t len)
 236 {
 237 #ifdef NETIF_DEBUG
 238         struct netif *nif = desc->io_netif;
 239 #endif
 240         struct netif_driver *drv = desc->io_netif->nif_driver;
 241         ssize_t rv;
 242
 243 #ifdef NETIF_DEBUG
 244         if (netif_debug)
 245                 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
 246 #endif
 247 #ifdef PARANOID
 248         if (drv->netif_put == NULL)
 249                 panic("%s%d: no netif_put support\n", drv->netif_bname,
 250                     nif->nif_unit);
 251 #endif
 252         rv = drv->netif_put(desc, pkt, len);
 253 #ifdef NETIF_DEBUG
 254         if (netif_debug)
 255                 printf("%s%d: netif_put returning %d\n", drv->netif_bname,
 256                     nif->nif_unit, (int)rv);
 257 #endif
 258         return (rv);
 259 }
 260
 261 struct iodesc *
 262 socktodesc(int sock)
 263 {
 264         if (sock >= SOPEN_MAX) {
 265                 errno = EBADF;
 266                 return (NULL);
 267         }
 268         return (&sockets[sock]);
 269 }
 270
 271 int
 272 netif_open(void *machdep_hint)
 273 {
 274         int fd;
 275         struct iodesc *s;
 276         struct netif *nif;
 277
 278         /* find a free socket */
 279         for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
 280                 if (s->io_netif == (struct netif *)0)
 281                         goto fnd;
 282         errno = EMFILE;
 283         return (-1);
 284
 285 fnd:
 286         bzero(s, sizeof(*s));
 287         netif_init();
 288         nif = netif_select(machdep_hint);
 289         if (!nif)
 290                 panic("netboot: no interfaces left untried");
 291         if (netif_probe(nif, machdep_hint)) {
 292                 printf("netboot: couldn't probe %s%d\n",
 293                     nif->nif_driver->netif_bname, nif->nif_unit);
 294                 errno = EINVAL;
 295                 return (-1);
 296         }
 297         netif_attach(nif, s, machdep_hint);
 298
 299         return (fd);
 300 }
 301
 302 int
 303 netif_close(int sock)
 304 {
 305         if (sock >= SOPEN_MAX) {
 306                 errno = EBADF;
 307                 return (-1);
 308         }
 309         netif_detach(sockets[sock].io_netif);
 310         sockets[sock].io_netif = (struct netif *)0;
 311
 312         return (0);
 313 }