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, unit_done, 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 unit_done = 0; 110 111 #ifdef NETIF_DEBUG 112 if (netif_debug) 113 printf("\t%s%d:", drv->netif_bname, 114 cur_if.nif_unit); 115 #endif 116 117 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 118 cur_if.nif_sel = s; 119 120 if (drv->netif_ifs[u].dif_used & (1 << s)) { 121 #ifdef NETIF_DEBUG 122 if (netif_debug) 123 printf(" [%d used]", s); 124 #endif 125 continue; 126 } 127 128 val = netif_match(&cur_if, machdep_hint); 129 #ifdef NETIF_DEBUG 130 if (netif_debug) 131 printf(" [%d -> %d]", s, val); 132 #endif 133 if (val > best_val) { 134 best_val = val; 135 best_if = cur_if; 136 } 137 } 138 #ifdef NETIF_DEBUG 139 if (netif_debug) 140 printf("\n"); 141 #endif 142 } 143 } 144 145 if (best_if.nif_driver == NULL) 146 return NULL; 147 148 best_if.nif_driver-> 149 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); 150 151 #ifdef NETIF_DEBUG 152 if (netif_debug) 153 printf("netif_select: %s%d(%d) wins\n", 154 best_if.nif_driver->netif_bname, 155 best_if.nif_unit, best_if.nif_sel); 156 #endif 157 return &best_if; 158 } 159 160 int 161 netif_probe(struct netif *nif, void *machdep_hint) 162 { 163 struct netif_driver *drv = nif->nif_driver; 164 165 #ifdef NETIF_DEBUG 166 if (netif_debug) 167 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 168 #endif 169 return drv->netif_probe(nif, machdep_hint); 170 } 171 172 void 173 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint) 174 { 175 struct netif_driver *drv = nif->nif_driver; 176 177 #ifdef NETIF_DEBUG 178 if (netif_debug) 179 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit); 180 #endif 181 desc->io_netif = nif; 182 #ifdef PARANOID 183 if (drv->netif_init == NULL) 184 panic("%s%d: no netif_init support\n", drv->netif_bname, 185 nif->nif_unit); 186 #endif 187 drv->netif_init(desc, machdep_hint); 188 bzero(drv->netif_ifs[nif->nif_unit].dif_stats, 189 sizeof(struct netif_stats)); 190 } 191 192 void 193 netif_detach(struct netif *nif) 194 { 195 struct netif_driver *drv = nif->nif_driver; 196 197 #ifdef NETIF_DEBUG 198 if (netif_debug) 199 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 200 #endif 201 #ifdef PARANOID 202 if (drv->netif_end == NULL) 203 panic("%s%d: no netif_end support\n", drv->netif_bname, 204 nif->nif_unit); 205 #endif 206 drv->netif_end(nif); 207 } 208 209 ssize_t 210 netif_get(struct iodesc *desc, void **pkt, time_t timo) 211 { 212 #ifdef NETIF_DEBUG 213 struct netif *nif = desc->io_netif; 214 #endif 215 struct netif_driver *drv = desc->io_netif->nif_driver; 216 ssize_t rv; 217 218 #ifdef NETIF_DEBUG 219 if (netif_debug) 220 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 221 #endif 222 #ifdef PARANOID 223 if (drv->netif_get == NULL) 224 panic("%s%d: no netif_get support\n", drv->netif_bname, 225 nif->nif_unit); 226 #endif 227 rv = drv->netif_get(desc, pkt, timo); 228 #ifdef NETIF_DEBUG 229 if (netif_debug) 230 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 231 nif->nif_unit, (int)rv); 232 #endif 233 return (rv); 234 } 235 236 ssize_t 237 netif_put(struct iodesc *desc, void *pkt, size_t len) 238 { 239 #ifdef NETIF_DEBUG 240 struct netif *nif = desc->io_netif; 241 #endif 242 struct netif_driver *drv = desc->io_netif->nif_driver; 243 ssize_t rv; 244 245 #ifdef NETIF_DEBUG 246 if (netif_debug) 247 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit); 248 #endif 249 #ifdef PARANOID 250 if (drv->netif_put == NULL) 251 panic("%s%d: no netif_put support\n", drv->netif_bname, 252 nif->nif_unit); 253 #endif 254 rv = drv->netif_put(desc, pkt, len); 255 #ifdef NETIF_DEBUG 256 if (netif_debug) 257 printf("%s%d: netif_put returning %d\n", drv->netif_bname, 258 nif->nif_unit, (int)rv); 259 #endif 260 return (rv); 261 } 262 263 struct iodesc * 264 socktodesc(int sock) 265 { 266 if (sock >= SOPEN_MAX) { 267 errno = EBADF; 268 return (NULL); 269 } 270 return (&sockets[sock]); 271 } 272 273 int 274 netif_open(void *machdep_hint) 275 { 276 int fd; 277 struct iodesc *s; 278 struct netif *nif; 279 280 /* find a free socket */ 281 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 282 if (s->io_netif == (struct netif *)0) 283 goto fnd; 284 errno = EMFILE; 285 return (-1); 286 287 fnd: 288 bzero(s, sizeof(*s)); 289 netif_init(); 290 nif = netif_select(machdep_hint); 291 if (!nif) 292 panic("netboot: no interfaces left untried"); 293 if (netif_probe(nif, machdep_hint)) { 294 printf("netboot: couldn't probe %s%d\n", 295 nif->nif_driver->netif_bname, nif->nif_unit); 296 errno = EINVAL; 297 return (-1); 298 } 299 netif_attach(nif, s, machdep_hint); 300 301 return (fd); 302 } 303 304 int 305 netif_close(int sock) 306 { 307 if (sock >= SOPEN_MAX) { 308 errno = EBADF; 309 return (-1); 310 } 311 netif_detach(sockets[sock].io_netif); 312 sockets[sock].io_netif = (struct netif *)0; 313 314 return (0); 315 } 316