1 /* $OpenBSD: netif.c,v 1.7 2003/06/01 17:00:33 deraadt Exp $ */ 2 /* $NetBSD: netif.c,v 1.7 1996/10/13 02:29:03 christos 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 40 #include <netinet/in.h> 41 #include <netinet/in_systm.h> 42 43 #include "stand.h" 44 #include "net.h" 45 #include "netif.h" 46 47 struct iodesc sockets[SOPEN_MAX]; 48 #ifdef NETIF_DEBUG 49 int netif_debug = 0; 50 #endif 51 52 /* 53 * netif_init: 54 * 55 * initialize the generic network interface layer 56 */ 57 58 void 59 netif_init() 60 { 61 struct netif_driver *drv; 62 int d, i; 63 64 #ifdef NETIF_DEBUG 65 if (netif_debug) 66 printf("netif_init: called\n"); 67 #endif 68 for (d = 0; d < n_netif_drivers; d++) { 69 drv = netif_drivers[d]; 70 for (i = 0; i < drv->netif_nifs; i++) 71 drv->netif_ifs[i].dif_used = 0; 72 } 73 } 74 75 int 76 netif_match(nif, machdep_hint) 77 struct netif *nif; 78 void *machdep_hint; 79 { 80 struct netif_driver *drv = nif->nif_driver; 81 82 #if 0 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(machdep_hint) 92 void *machdep_hint; 93 { 94 int d, u, unit_done, s; 95 struct netif_driver *drv; 96 struct netif cur_if; 97 static struct netif best_if; 98 int best_val; 99 int val; 100 101 best_val = 0; 102 best_if.nif_driver = NULL; 103 104 #ifdef NETIF_DEBUG 105 if (netif_debug) 106 printf("netif_select: %d interfaces\n", n_netif_drivers); 107 #endif 108 109 for (d = 0; d < n_netif_drivers; d++) { 110 cur_if.nif_driver = netif_drivers[d]; 111 drv = cur_if.nif_driver; 112 113 for (u = 0; u < drv->netif_nifs; u++) { 114 cur_if.nif_unit = u; 115 unit_done = 0; 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(nif, machdep_hint) 168 struct netif *nif; 169 void *machdep_hint; 170 { 171 struct netif_driver *drv = nif->nif_driver; 172 173 #ifdef NETIF_DEBUG 174 if (netif_debug) 175 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 176 #endif 177 return drv->netif_probe(nif, machdep_hint); 178 } 179 180 void 181 netif_attach(nif, desc, machdep_hint) 182 struct netif *nif; 183 struct iodesc *desc; 184 void *machdep_hint; 185 { 186 struct netif_driver *drv = nif->nif_driver; 187 188 #ifdef NETIF_DEBUG 189 if (netif_debug) 190 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit); 191 #endif 192 desc->io_netif = nif; 193 #ifdef PARANOID 194 if (drv->netif_init == NULL) 195 panic("%s%d: no netif_init support", drv->netif_bname, 196 nif->nif_unit); 197 #endif 198 drv->netif_init(desc, machdep_hint); 199 bzero(drv->netif_ifs[nif->nif_unit].dif_stats, 200 sizeof(struct netif_stats)); 201 } 202 203 void 204 netif_detach(nif) 205 struct netif *nif; 206 { 207 struct netif_driver *drv = nif->nif_driver; 208 209 #ifdef NETIF_DEBUG 210 if (netif_debug) 211 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 212 #endif 213 #ifdef PARANOID 214 if (drv->netif_end == NULL) 215 panic("%s%d: no netif_end support", drv->netif_bname, 216 nif->nif_unit); 217 #endif 218 drv->netif_end(nif); 219 } 220 221 ssize_t 222 netif_get(desc, pkt, len, timo) 223 struct iodesc *desc; 224 void *pkt; 225 size_t len; 226 time_t timo; 227 { 228 #ifdef NETIF_DEBUG 229 struct netif *nif = desc->io_netif; 230 #endif 231 struct netif_driver *drv = desc->io_netif->nif_driver; 232 ssize_t rv; 233 234 #ifdef NETIF_DEBUG 235 if (netif_debug) 236 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 237 #endif 238 #ifdef PARANOID 239 if (drv->netif_get == NULL) 240 panic("%s%d: no netif_get support", drv->netif_bname, 241 nif->nif_unit); 242 #endif 243 rv = drv->netif_get(desc, pkt, len, timo); 244 #ifdef NETIF_DEBUG 245 if (netif_debug) 246 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 247 nif->nif_unit, rv); 248 #endif 249 return rv; 250 } 251 252 ssize_t 253 netif_put(desc, pkt, len) 254 struct iodesc *desc; 255 void *pkt; 256 size_t len; 257 { 258 #ifdef NETIF_DEBUG 259 struct netif *nif = desc->io_netif; 260 #endif 261 struct netif_driver *drv = desc->io_netif->nif_driver; 262 ssize_t rv; 263 264 #ifdef NETIF_DEBUG 265 if (netif_debug) 266 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit); 267 #endif 268 #ifdef PARANOID 269 if (drv->netif_put == NULL) 270 panic("%s%d: no netif_put support", drv->netif_bname, 271 nif->nif_unit); 272 #endif 273 rv = drv->netif_put(desc, pkt, len); 274 #ifdef NETIF_DEBUG 275 if (netif_debug) 276 printf("%s%d: netif_put returning %d\n", drv->netif_bname, 277 nif->nif_unit, rv); 278 #endif 279 return rv; 280 } 281 282 struct iodesc * 283 socktodesc(sock) 284 int sock; 285 { 286 if (sock >= SOPEN_MAX) { 287 errno = EBADF; 288 return (NULL); 289 } 290 return (&sockets[sock]); 291 } 292 293 int 294 netif_open(machdep_hint) 295 void *machdep_hint; 296 { 297 int fd; 298 register struct iodesc *s; 299 struct netif *nif; 300 301 /* find a free socket */ 302 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 303 if (s->io_netif == (struct netif *)0) 304 goto fnd; 305 errno = EMFILE; 306 return (-1); 307 308 fnd: 309 bzero(s, sizeof(*s)); 310 netif_init(); 311 nif = netif_select(machdep_hint); 312 if (!nif) 313 panic("netboot: no interfaces left untried"); 314 if (netif_probe(nif, machdep_hint)) { 315 printf("netboot: couldn't probe %s%d\n", 316 nif->nif_driver->netif_bname, nif->nif_unit); 317 errno = EINVAL; 318 return(-1); 319 } 320 netif_attach(nif, s, machdep_hint); 321 322 return(fd); 323 } 324 325 int 326 netif_close(sock) 327 int sock; 328 { 329 if (sock >= SOPEN_MAX) { 330 errno = EBADF; 331 return(-1); 332 } 333 netif_detach(sockets[sock].io_netif); 334 sockets[sock].io_netif = (struct netif *)0; 335 336 return(0); 337 } 338