sys/lib/libsa/netif.c

   1 /*      $NetBSD: netif.c,v 1.25 2013/10/20 17:16:57 christos 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, 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
 117 #ifdef NETIF_DEBUG
 118                         if (netif_debug)
 119                                 printf("\t%s%d:", drv->netif_bname,
 120                                     cur_if.nif_unit);
 121 #endif
 122
 123                         for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) {
 124                                 cur_if.nif_sel = s;
 125
 126                                 if (drv->netif_ifs[u].dif_used & (1 << s)) {
 127 #ifdef NETIF_DEBUG
 128                                         if (netif_debug)
 129                                                 printf(" [%d used]", s);
 130 #endif
 131                                         continue;
 132                                 }
 133
 134                                 val = netif_match(&cur_if, machdep_hint);
 135 #ifdef NETIF_DEBUG
 136                                 if (netif_debug)
 137                                         printf(" [%d -> %d]", s, val);
 138 #endif
 139                                 if (val > best_val) {
 140                                         best_val = val;
 141                                         best_if = cur_if;
 142                                 }
 143                         }
 144 #ifdef NETIF_DEBUG
 145                         if (netif_debug)
 146                                 printf("\n");
 147 #endif
 148                 }
 149         }
 150
 151         if (best_if.nif_driver == NULL)
 152                 return NULL;
 153
 154         best_if.nif_driver->
 155             netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel);
 156
 157 #ifdef NETIF_DEBUG
 158         if (netif_debug)
 159                 printf("netif_select: %s%d(%d) wins\n",
 160                         best_if.nif_driver->netif_bname,
 161                         best_if.nif_unit, best_if.nif_sel);
 162 #endif
 163         return &best_if;
 164 }
 165
 166 int
 167 netif_probe(struct netif *nif, void *machdep_hint)
 168 {
 169         struct netif_driver *drv = nif->nif_driver;
 170
 171 #ifdef NETIF_DEBUG
 172         if (netif_debug)
 173                 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit);
 174 #endif
 175         return drv->netif_probe(nif, machdep_hint);
 176 }
 177
 178 void
 179 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint)
 180 {
 181         struct netif_driver *drv = nif->nif_driver;
 182
 183 #ifdef NETIF_DEBUG
 184         if (netif_debug)
 185                 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit);
 186 #endif
 187         desc->io_netif = nif;
 188 #ifdef PARANOID
 189         if (drv->netif_init == NULL)
 190                 panic("%s%d: no netif_init support", drv->netif_bname,
 191                     nif->nif_unit);
 192 #endif
 193         drv->netif_init(desc, machdep_hint);
 194         (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0,
 195             sizeof(struct netif_stats));
 196 }
 197
 198 void
 199 netif_detach(struct netif *nif)
 200 {
 201         struct netif_driver *drv = nif->nif_driver;
 202
 203 #ifdef NETIF_DEBUG
 204         if (netif_debug)
 205                 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit);
 206 #endif
 207 #ifdef PARANOID
 208         if (drv->netif_end == NULL)
 209                 panic("%s%d: no netif_end support", drv->netif_bname,
 210                     nif->nif_unit);
 211 #endif
 212         drv->netif_end(nif);
 213 }
 214
 215 ssize_t
 216 netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo)
 217 {
 218         struct netif *nif = desc->io_netif;
 219         struct netif_driver *drv = nif->nif_driver;
 220         ssize_t rv;
 221
 222 #ifdef NETIF_DEBUG
 223         if (netif_debug)
 224                 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit);
 225 #endif
 226 #ifdef PARANOID
 227         if (drv->netif_get == NULL)
 228                 panic("%s%d: no netif_get support", drv->netif_bname,
 229                     nif->nif_unit);
 230 #endif
 231         rv = drv->netif_get(desc, pkt, len, timo);
 232 #ifdef NETIF_DEBUG
 233         if (netif_debug)
 234                 printf("%s%d: netif_get returning %d\n", drv->netif_bname,
 235                     nif->nif_unit, (int)rv);
 236 #endif
 237         return rv;
 238 }
 239
 240 ssize_t
 241 netif_put(struct iodesc *desc, void *pkt, size_t len)
 242 {
 243         struct netif *nif = desc->io_netif;
 244         struct netif_driver *drv = nif->nif_driver;
 245         ssize_t rv;
 246
 247 #ifdef NETIF_DEBUG
 248         if (netif_debug)
 249                 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit);
 250 #endif
 251 #ifdef PARANOID
 252         if (drv->netif_put == NULL)
 253                 panic("%s%d: no netif_put support", drv->netif_bname,
 254                     nif->nif_unit);
 255 #endif
 256         rv = drv->netif_put(desc, pkt, len);
 257 #ifdef NETIF_DEBUG
 258         if (netif_debug)
 259                 printf("%s%d: netif_put returning %d\n", drv->netif_bname,
 260                     nif->nif_unit, (int)rv);
 261 #endif
 262         return rv;
 263 }
 264
 265 struct iodesc *
 266 socktodesc(int sock)
 267 {
 268 #if !defined(LIBSA_NO_FD_CHECKING)
 269         if (sock >= SOPEN_MAX) {
 270                 errno = EBADF;
 271                 return NULL;
 272         }
 273 #endif
 274         return &sockets[sock];
 275 }
 276
 277 int
 278 netif_open(void *machdep_hint)
 279 {
 280         int fd;
 281         struct iodesc *s;
 282         struct netif *nif;
 283
 284         /* find a free socket */
 285         for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++)
 286                 if (s->io_netif == (struct netif *)0)
 287                         goto fnd;
 288         errno = EMFILE;
 289         return -1;
 290
 291 fnd:
 292         (void)memset(s, 0, sizeof(*s));
 293         netif_init();
 294         nif = netif_select(machdep_hint);
 295         if (!nif)
 296                 panic("netboot: no interfaces left untried");
 297         if (netif_probe(nif, machdep_hint)) {
 298                 printf("netboot: couldn't probe %s%d\n",
 299                     nif->nif_driver->netif_bname, nif->nif_unit);
 300                 errno = EINVAL;
 301                 return -1;
 302         }
 303         netif_attach(nif, s, machdep_hint);
 304
 305         return fd;
 306 }
 307
 308 int
 309 netif_close(int sock)
 310 {
 311 #if !defined(LIBSA_NO_FD_CHECKING)
 312         if (sock >= SOPEN_MAX) {
 313                 errno = EBADF;
 314                 return -1;
 315         }
 316 #endif
 317         netif_detach(sockets[sock].io_netif);
 318         sockets[sock].io_netif = (struct netif *)0;
 319
 320         return 0;
 321 }