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/param.h> 35 #include <sys/types.h> 36 #include <sys/mount.h> 37 #include <string.h> 38 39 #include <netinet/in.h> 40 #include <netinet/in_systm.h> 41 42 #include "stand.h" 43 #include "net.h" 44 #include "netif.h" 45 46 struct iodesc sockets[SOPEN_MAX]; 47 #ifdef NETIF_DEBUG 48 int netif_debug = 0; 49 #endif 50 51 /* 52 * netif_init: 53 * 54 * initialize the generic network interface layer 55 */ 56 57 void 58 netif_init(void) 59 { 60 struct netif_driver *drv; 61 int d, i; 62 63 #ifdef NETIF_DEBUG 64 if (netif_debug) 65 printf("netif_init: called\n"); 66 #endif 67 for (d = 0; netif_drivers[d]; d++) { 68 drv = netif_drivers[d]; 69 for (i = 0; i < drv->netif_nifs; i++) 70 drv->netif_ifs[i].dif_used = 0; 71 } 72 } 73 74 int 75 netif_match(struct netif *nif, void *machdep_hint) 76 { 77 struct netif_driver *drv = nif->nif_driver; 78 79 #if 0 80 if (netif_debug) 81 printf("%s%d: netif_match (%d)\n", drv->netif_bname, 82 nif->nif_unit, nif->nif_sel); 83 #endif 84 return drv->netif_match(nif, machdep_hint); 85 } 86 87 struct netif * 88 netif_select(void *machdep_hint) 89 { 90 int d, u, s; 91 struct netif_driver *drv; 92 struct netif cur_if; 93 static struct netif best_if; 94 int best_val; 95 int val; 96 97 best_val = 0; 98 best_if.nif_driver = NULL; 99 100 for (d = 0; netif_drivers[d] != NULL; d++) { 101 cur_if.nif_driver = netif_drivers[d]; 102 drv = cur_if.nif_driver; 103 104 for (u = 0; u < drv->netif_nifs; u++) { 105 cur_if.nif_unit = u; 106 107 #ifdef NETIF_DEBUG 108 if (netif_debug) 109 printf("\t%s%d:", drv->netif_bname, 110 cur_if.nif_unit); 111 #endif 112 113 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 114 cur_if.nif_sel = s; 115 116 if (drv->netif_ifs[u].dif_used & (1 << s)) { 117 #ifdef NETIF_DEBUG 118 if (netif_debug) 119 printf(" [%d used]", s); 120 #endif 121 continue; 122 } 123 124 val = netif_match(&cur_if, machdep_hint); 125 #ifdef NETIF_DEBUG 126 if (netif_debug) 127 printf(" [%d -> %d]", s, val); 128 #endif 129 if (val > best_val) { 130 best_val = val; 131 best_if = cur_if; 132 } 133 } 134 #ifdef NETIF_DEBUG 135 if (netif_debug) 136 printf("\n"); 137 #endif 138 } 139 } 140 141 if (best_if.nif_driver == NULL) 142 return NULL; 143 144 best_if.nif_driver-> 145 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); 146 147 #ifdef NETIF_DEBUG 148 if (netif_debug) 149 printf("netif_select: %s%d(%d) wins\n", 150 best_if.nif_driver->netif_bname, 151 best_if.nif_unit, best_if.nif_sel); 152 #endif 153 return &best_if; 154 } 155 156 int 157 netif_probe(struct netif *nif, void *machdep_hint) 158 { 159 struct netif_driver *drv = nif->nif_driver; 160 161 #ifdef NETIF_DEBUG 162 if (netif_debug) 163 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 164 #endif 165 return drv->netif_probe(nif, machdep_hint); 166 } 167 168 void 169 netif_attach(struct netif *nif, struct iodesc *desc, 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_attach\n", drv->netif_bname, nif->nif_unit); 176 #endif 177 desc->io_netif = nif; 178 #ifdef PARANOID 179 if (drv->netif_init == NULL) 180 panic("%s%d: no netif_init support\n", drv->netif_bname, 181 nif->nif_unit); 182 #endif 183 drv->netif_init(desc, machdep_hint); 184 bzero(drv->netif_ifs[nif->nif_unit].dif_stats, 185 sizeof(struct netif_stats)); 186 } 187 188 void 189 netif_detach(struct netif *nif) 190 { 191 struct netif_driver *drv = nif->nif_driver; 192 193 #ifdef NETIF_DEBUG 194 if (netif_debug) 195 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 196 #endif 197 #ifdef PARANOID 198 if (drv->netif_end == NULL) 199 panic("%s%d: no netif_end support\n", drv->netif_bname, 200 nif->nif_unit); 201 #endif 202 drv->netif_end(nif); 203 } 204 205 ssize_t 206 netif_get(struct iodesc *desc, void *pkt, size_t len, time_t timo) 207 { 208 #ifdef NETIF_DEBUG 209 struct netif *nif = desc->io_netif; 210 #endif 211 struct netif_driver *drv = desc->io_netif->nif_driver; 212 ssize_t rv; 213 214 #ifdef NETIF_DEBUG 215 if (netif_debug) 216 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 217 #endif 218 #ifdef PARANOID 219 if (drv->netif_get == NULL) 220 panic("%s%d: no netif_get support\n", drv->netif_bname, 221 nif->nif_unit); 222 #endif 223 rv = drv->netif_get(desc, pkt, len, timo); 224 #ifdef NETIF_DEBUG 225 if (netif_debug) 226 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 227 nif->nif_unit, (int)rv); 228 #endif 229 return rv; 230 } 231 232 ssize_t 233 netif_put(struct iodesc *desc, void *pkt, size_t len) 234 { 235 #ifdef NETIF_DEBUG 236 struct netif *nif = desc->io_netif; 237 #endif 238 struct netif_driver *drv = desc->io_netif->nif_driver; 239 ssize_t rv; 240 241 #ifdef NETIF_DEBUG 242 if (netif_debug) 243 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit); 244 #endif 245 #ifdef PARANOID 246 if (drv->netif_put == NULL) 247 panic("%s%d: no netif_put support\n", drv->netif_bname, 248 nif->nif_unit); 249 #endif 250 rv = drv->netif_put(desc, pkt, len); 251 #ifdef NETIF_DEBUG 252 if (netif_debug) 253 printf("%s%d: netif_put returning %d\n", drv->netif_bname, 254 nif->nif_unit, (int)rv); 255 #endif 256 return rv; 257 } 258 259 struct iodesc * 260 socktodesc(int sock) 261 { 262 if (sock >= SOPEN_MAX) { 263 errno = EBADF; 264 return (NULL); 265 } 266 return (&sockets[sock]); 267 } 268 269 int 270 netif_open(void *machdep_hint) 271 { 272 int fd; 273 struct iodesc *s; 274 struct netif *nif; 275 276 /* find a free socket */ 277 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 278 if (s->io_netif == NULL) 279 goto fnd; 280 errno = EMFILE; 281 return (-1); 282 283 fnd: 284 bzero(s, sizeof(*s)); 285 netif_init(); 286 nif = netif_select(machdep_hint); 287 if (!nif) 288 panic("netboot: no interfaces left untried"); 289 if (netif_probe(nif, machdep_hint)) { 290 printf("netboot: couldn't probe %s%d\n", 291 nif->nif_driver->netif_bname, nif->nif_unit); 292 errno = EINVAL; 293 return(-1); 294 } 295 netif_attach(nif, s, machdep_hint); 296 297 return(fd); 298 } 299 300 int 301 netif_close(int sock) 302 { 303 if (sock >= SOPEN_MAX) { 304 errno = EBADF; 305 return(-1); 306 } 307 netif_detach(sockets[sock].io_netif); 308 sockets[sock].io_netif = NULL; 309 310 return(0); 311 } 312