sys/lib/libsa/netif.c

   1 /*      $NetBSD: netif.c,v 1.23 2009/01/12 11:32:45 tsutsui 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/cdefs.h>
  36 #include <sys/mount.h>
  37 #ifdef _STANDALONE
  38 #include <lib/libkern/libkern.h>
  39 #else
  40 #include <string.h>
  41 #endif
  42
  43 #include <netinet/in.h>
  44 #include <netinet/in_systm.h>
  45
  46 #include "stand.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; d < n_netif_drivers; 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     netif_match(struct netif *, void *);
  78
  79 int
  80 netif_match(struct netif *nif, void *machdep_hint)
  81 {
  82         struct netif_driver *drv = nif->nif_driver;
  83
  84 #if 0
  85         if (netif_debug)
  86                 printf("%s%d: netif_match (%d)\n", drv->netif_bname,
  87                     nif->nif_unit, nif->nif_sel);
  88 #endif
  89         return drv->netif_match(nif, machdep_hint);
  90 }
  91
  92 struct netif *
  93 netif_select(void *machdep_hint)
  94 {
  95         int d, u, unit_done, s;
  96         struct netif_driver *drv;
  97         struct netif cur_if;
  98         static struct netif best_if;
  99         int best_val;
 100         int val;
 101
 102         best_val = 0;
 103         best_if.nif_driver = NULL;
 104
 105 #ifdef NETIF_DEBUG
 106         if (netif_debug)
 107                 printf("netif_select: %d interfaces\n", n_netif_drivers);
 108 #endif
 109
 110         for (d = 0; d < n_netif_drivers; d++) {
 111                 cur_if.nif_driver = netif_drivers[d];
 112                 drv = cur_if.nif_driver;
 113
 114                 for (u = 0; u < drv->netif_nifs; u++) {
 115                         cur_if.nif_unit = u;
 116                         unit_done = 0;
 117
 118 #ifdef NETIF_DEBUG
 119                         if (netif_debug)
 120                                 printf("\t%s%d:", drv->netif_bname,
 121                                     cur_if.nif_unit);
 122 #endif
 123
 124                         for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
 125                                 cur_if.nif_sel = s;
 126
 127                                 if (drv->netif_ifs[u].dif_used & (1 << s)) {
 128 #ifdef NETIF_DEBUG
 129                                         if (netif_debug)
 130                                                 printf(" [%d used]", s);
 131 #endif
 132                                         continue;
 133                                 }
 134
 135                                 val = netif_match(&cur_if, machdep_hint);
 136 #ifdef NETIF_DEBUG
 137                                 if (netif_debug)
 138                                         printf(" [%d -> %d]", s, val);
 139 #endif
 140                                 if (val > best_val) {
 141                                         best_val = val;
 142                                         best_if = cur_if;
 143                                 }
 144                         }
 145 #ifdef NETIF_DEBUG
 146                         if (netif_debug)
 147                                 printf("\n");
 148 #endif
 149                 }
 150         }
 151
 152         if (best_if.nif_driver == NULL)
 153                 return NULL;
 154
 155         best_if.nif_driver->
 156             netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
 157
 158 #ifdef NETIF_DEBUG
 159         if (netif_debug)
 160                 printf("netif_select: %s%d(%d) wins\n",
 161                         best_if.nif_driver->netif_bname,
 162                         best_if.nif_unit, best_if.nif_sel);
 163 #endif
 164         return &best_if;
 165 }
 166
 167 int
 168 netif_probe(struct netif *nif, void *machdep_hint)
 169 {
 170         struct netif_driver *drv = nif->nif_driver;
 171
 172 #ifdef NETIF_DEBUG
 173         if (netif_debug)
 174                 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
 175 #endif
 176         return drv->netif_probe(nif, machdep_hint);
 177 }
 178
 179 void
 180 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
 181 {
 182         struct netif_driver *drv = nif->nif_driver;
 183
 184 #ifdef NETIF_DEBUG
 185         if (netif_debug)
 186                 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
 187 #endif
 188         desc->io_netif = nif;
 189 #ifdef PARANOID
 190         if (drv->netif_init == NULL)
 191                 panic("%s%d: no netif_init support", drv->netif_bname,
 192                     nif->nif_unit);
 193 #endif
 194         drv->netif_init(desc, machdep_hint);
 195         (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0,
 196             sizeof(struct netif_stats));
 197 }
 198
 199 void
 200 netif_detach(struct netif *nif)
 201 {
 202         struct netif_driver *drv = nif->nif_driver;
 203
 204 #ifdef NETIF_DEBUG
 205         if (netif_debug)
 206                 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
 207 #endif
 208 #ifdef PARANOID
 209         if (drv->netif_end == NULL)
 210                 panic("%s%d: no netif_end support", drv->netif_bname,
 211                     nif->nif_unit);
 212 #endif
 213         drv->netif_end(nif);
 214 }
 215
 216 ssize_t
 217 netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo)
 218 {
 219         struct netif *nif = desc->io_netif;
 220         struct netif_driver *drv = nif->nif_driver;
 221         ssize_t rv;
 222
 223 #ifdef NETIF_DEBUG
 224         if (netif_debug)
 225                 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
 226 #endif
 227 #ifdef PARANOID
 228         if (drv->netif_get == NULL)
 229                 panic("%s%d: no netif_get support", drv->netif_bname,
 230                     nif->nif_unit);
 231 #endif
 232         rv = drv->netif_get(desc, pkt, len, timo);
 233 #ifdef NETIF_DEBUG
 234         if (netif_debug)
 235                 printf("%s%d: netif_get returning %d\n", drv->netif_bname,
 236                     nif->nif_unit, (int)rv);
 237 #endif
 238         return rv;
 239 }
 240
 241 ssize_t
 242 netif_put(struct iodesc *desc, void *pkt, size_t len)
 243 {
 244         struct netif *nif = desc->io_netif;
 245         struct netif_driver *drv = nif->nif_driver;
 246         ssize_t rv;
 247
 248 #ifdef NETIF_DEBUG
 249         if (netif_debug)
 250                 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
 251 #endif
 252 #ifdef PARANOID
 253         if (drv->netif_put == NULL)
 254                 panic("%s%d: no netif_put support", drv->netif_bname,
 255                     nif->nif_unit);
 256 #endif
 257         rv = drv->netif_put(desc, pkt, len);
 258 #ifdef NETIF_DEBUG
 259         if (netif_debug)
 260                 printf("%s%d: netif_put returning %d\n", drv->netif_bname,
 261                     nif->nif_unit, (int)rv);
 262 #endif
 263         return rv;
 264 }
 265
 266 struct iodesc *
 267 socktodesc(int sock)
 268 {
 269 #if !defined(LIBSA_NO_FD_CHECKING)
 270         if (sock >= SOPEN_MAX) {
 271                 errno = EBADF;
 272                 return NULL;
 273         }
 274 #endif
 275         return &sockets[sock];
 276 }
 277
 278 int
 279 netif_open(void *machdep_hint)
 280 {
 281         int fd;
 282         struct iodesc *s;
 283         struct netif *nif;
 284
 285         /* find a free socket */
 286         for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
 287                 if (s->io_netif == (struct netif *)0)
 288                         goto fnd;
 289         errno = EMFILE;
 290         return -1;
 291
 292 fnd:
 293         (void)memset(s, 0, sizeof(*s));
 294         netif_init();
 295         nif = netif_select(machdep_hint);
 296         if (!nif)
 297                 panic("netboot: no interfaces left untried");
 298         if (netif_probe(nif, machdep_hint)) {
 299                 printf("netboot: couldn't probe %s%d\n",
 300                     nif->nif_driver->netif_bname, nif->nif_unit);
 301                 errno = EINVAL;
 302                 return -1;
 303         }
 304         netif_attach(nif, s, machdep_hint);
 305
 306         return fd;
 307 }
 308
 309 int
 310 netif_close(int sock)
 311 {
 312 #if !defined(LIBSA_NO_FD_CHECKING)
 313         if (sock >= SOPEN_MAX) {
 314                 errno = EBADF;
 315                 return -1;
 316         }
 317 #endif
 318         netif_detach(sockets[sock].io_netif);
 319         sockets[sock].io_netif = (struct netif *)0;
 320
 321         return 0;
 322 }