netif.c revision 1.15
1 /* $NetBSD: netif.c,v 1.15 2000/03/30 12:19:48 augustss 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/cdefs.h> 37 #include <sys/mount.h> 38 #ifdef _STANDALONE 39 #include <lib/libkern/libkern.h> 40 #else 41 #include <string.h> 42 #endif 43 44 #include <netinet/in.h> 45 #include <netinet/in_systm.h> 46 47 #include "stand.h" 48 #include "net.h" 49 #include "netif.h" 50 51 struct iodesc sockets[SOPEN_MAX]; 52 #ifdef NETIF_DEBUG 53 int netif_debug = 0; 54 #endif 55 56 /* 57 * netif_init: 58 * 59 * initialize the generic network interface layer 60 */ 61 62 void 63 netif_init() 64 { 65 struct netif_driver *drv; 66 int d, i; 67 68 #ifdef NETIF_DEBUG 69 if (netif_debug) 70 printf("netif_init: called\n"); 71 #endif 72 for (d = 0; d < n_netif_drivers; d++) { 73 drv = netif_drivers[d]; 74 for (i = 0; i < drv->netif_nifs; i++) 75 drv->netif_ifs[i].dif_used = 0; 76 } 77 } 78 79 int netif_match __P((struct netif *, void *)); 80 81 int 82 netif_match(nif, machdep_hint) 83 struct netif *nif; 84 void *machdep_hint; 85 { 86 struct netif_driver *drv = nif->nif_driver; 87 88 #if 0 89 if (netif_debug) 90 printf("%s%d: netif_match (%d)\n", drv->netif_bname, 91 nif->nif_unit, nif->nif_sel); 92 #endif 93 return drv->netif_match(nif, machdep_hint); 94 } 95 96 struct netif * 97 netif_select(machdep_hint) 98 void *machdep_hint; 99 { 100 int d, u, unit_done, s; 101 struct netif_driver *drv; 102 struct netif cur_if; 103 static struct netif best_if; 104 int best_val; 105 int val; 106 107 best_val = 0; 108 best_if.nif_driver = NULL; 109 110 #ifdef NETIF_DEBUG 111 if (netif_debug) 112 printf("netif_select: %d interfaces\n", n_netif_drivers); 113 #endif 114 115 for (d = 0; d < n_netif_drivers; d++) { 116 cur_if.nif_driver = netif_drivers[d]; 117 drv = cur_if.nif_driver; 118 119 for (u = 0; u < drv->netif_nifs; u++) { 120 cur_if.nif_unit = u; 121 unit_done = 0; 122 123 #ifdef NETIF_DEBUG 124 if (netif_debug) 125 printf("\t%s%d:", drv->netif_bname, 126 cur_if.nif_unit); 127 #endif 128 129 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 130 cur_if.nif_sel = s; 131 132 if (drv->netif_ifs[u].dif_used & (1 << s)) { 133 #ifdef NETIF_DEBUG 134 if (netif_debug) 135 printf(" [%d used]", s); 136 #endif 137 continue; 138 } 139 140 val = netif_match(&cur_if, machdep_hint); 141 #ifdef NETIF_DEBUG 142 if (netif_debug) 143 printf(" [%d -> %d]", s, val); 144 #endif 145 if (val > best_val) { 146 best_val = val; 147 best_if = cur_if; 148 } 149 } 150 #ifdef NETIF_DEBUG 151 if (netif_debug) 152 printf("\n"); 153 #endif 154 } 155 } 156 157 if (best_if.nif_driver == NULL) 158 return NULL; 159 160 best_if.nif_driver-> 161 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); 162 163 #ifdef NETIF_DEBUG 164 if (netif_debug) 165 printf("netif_select: %s%d(%d) wins\n", 166 best_if.nif_driver->netif_bname, 167 best_if.nif_unit, best_if.nif_sel); 168 #endif 169 return &best_if; 170 } 171 172 int 173 netif_probe(nif, machdep_hint) 174 struct netif *nif; 175 void *machdep_hint; 176 { 177 struct netif_driver *drv = nif->nif_driver; 178 179 #ifdef NETIF_DEBUG 180 if (netif_debug) 181 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 182 #endif 183 return drv->netif_probe(nif, machdep_hint); 184 } 185 186 void 187 netif_attach(nif, desc, machdep_hint) 188 struct netif *nif; 189 struct iodesc *desc; 190 void *machdep_hint; 191 { 192 struct netif_driver *drv = nif->nif_driver; 193 194 #ifdef NETIF_DEBUG 195 if (netif_debug) 196 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit); 197 #endif 198 desc->io_netif = nif; 199 #ifdef PARANOID 200 if (drv->netif_init == NULL) 201 panic("%s%d: no netif_init support\n", drv->netif_bname, 202 nif->nif_unit); 203 #endif 204 drv->netif_init(desc, machdep_hint); 205 bzero(drv->netif_ifs[nif->nif_unit].dif_stats, 206 sizeof(struct netif_stats)); 207 } 208 209 void 210 netif_detach(nif) 211 struct netif *nif; 212 { 213 struct netif_driver *drv = nif->nif_driver; 214 215 #ifdef NETIF_DEBUG 216 if (netif_debug) 217 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 218 #endif 219 #ifdef PARANOID 220 if (drv->netif_end == NULL) 221 panic("%s%d: no netif_end support\n", drv->netif_bname, 222 nif->nif_unit); 223 #endif 224 drv->netif_end(nif); 225 } 226 227 ssize_t 228 netif_get(desc, pkt, len, timo) 229 struct iodesc *desc; 230 void *pkt; 231 size_t len; 232 time_t timo; 233 { 234 #ifdef NETIF_DEBUG 235 struct netif *nif = desc->io_netif; 236 #endif 237 struct netif_driver *drv = desc->io_netif->nif_driver; 238 ssize_t rv; 239 240 #ifdef NETIF_DEBUG 241 if (netif_debug) 242 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 243 #endif 244 #ifdef PARANOID 245 if (drv->netif_get == NULL) 246 panic("%s%d: no netif_get support\n", drv->netif_bname, 247 nif->nif_unit); 248 #endif 249 rv = drv->netif_get(desc, pkt, len, timo); 250 #ifdef NETIF_DEBUG 251 if (netif_debug) 252 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 253 nif->nif_unit, (int)rv); 254 #endif 255 return rv; 256 } 257 258 ssize_t 259 netif_put(desc, pkt, len) 260 struct iodesc *desc; 261 void *pkt; 262 size_t len; 263 { 264 #ifdef NETIF_DEBUG 265 struct netif *nif = desc->io_netif; 266 #endif 267 struct netif_driver *drv = desc->io_netif->nif_driver; 268 ssize_t rv; 269 270 #ifdef NETIF_DEBUG 271 if (netif_debug) 272 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit); 273 #endif 274 #ifdef PARANOID 275 if (drv->netif_put == NULL) 276 panic("%s%d: no netif_put support\n", drv->netif_bname, 277 nif->nif_unit); 278 #endif 279 rv = drv->netif_put(desc, pkt, len); 280 #ifdef NETIF_DEBUG 281 if (netif_debug) 282 printf("%s%d: netif_put returning %d\n", drv->netif_bname, 283 nif->nif_unit, (int)rv); 284 #endif 285 return rv; 286 } 287 288 struct iodesc * 289 socktodesc(sock) 290 int sock; 291 { 292 #if !defined(LIBSA_NO_FD_CHECKING) 293 if (sock >= SOPEN_MAX) { 294 errno = EBADF; 295 return (NULL); 296 } 297 #endif 298 return (&sockets[sock]); 299 } 300 301 int 302 netif_open(machdep_hint) 303 void *machdep_hint; 304 { 305 int fd; 306 struct iodesc *s; 307 struct netif *nif; 308 309 /* find a free socket */ 310 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 311 if (s->io_netif == (struct netif *)0) 312 goto fnd; 313 errno = EMFILE; 314 return (-1); 315 316 fnd: 317 bzero(s, sizeof(*s)); 318 netif_init(); 319 nif = netif_select(machdep_hint); 320 if (!nif) 321 panic("netboot: no interfaces left untried"); 322 if (netif_probe(nif, machdep_hint)) { 323 printf("netboot: couldn't probe %s%d\n", 324 nif->nif_driver->netif_bname, nif->nif_unit); 325 errno = EINVAL; 326 return(-1); 327 } 328 netif_attach(nif, s, machdep_hint); 329 330 return(fd); 331 } 332 333 int 334 netif_close(sock) 335 int sock; 336 { 337 #if !defined(LIBSA_NO_FD_CHECKING) 338 if (sock >= SOPEN_MAX) { 339 errno = EBADF; 340 return(-1); 341 } 342 #endif 343 netif_detach(sockets[sock].io_netif); 344 sockets[sock].io_netif = (struct netif *)0; 345 346 return(0); 347 } 348
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