1 /* $OpenBSD: netif.c,v 1.9 2012/12/05 23:20:23 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/mount.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; d < n_netif_drivers; 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 static 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, unit_done, 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 #ifdef NETIF_DEBUG 101 if (netif_debug) 102 printf("netif_select: %d interfaces\n", n_netif_drivers); 103 #endif 104 105 for (d = 0; d < n_netif_drivers; d++) { 106 cur_if.nif_driver = netif_drivers[d]; 107 drv = cur_if.nif_driver; 108 109 for (u = 0; u < drv->netif_nifs; u++) { 110 cur_if.nif_unit = u; 111 unit_done = 0; 112 113 #ifdef NETIF_DEBUG 114 if (netif_debug) 115 printf("\t%s%d:", drv->netif_bname, 116 cur_if.nif_unit); 117 #endif 118 119 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 120 cur_if.nif_sel = s; 121 122 if (drv->netif_ifs[u].dif_used & (1 << s)) { 123 #ifdef NETIF_DEBUG 124 if (netif_debug) 125 printf(" [%d used]", s); 126 #endif 127 continue; 128 } 129 130 val = netif_match(&cur_if, machdep_hint); 131 #ifdef NETIF_DEBUG 132 if (netif_debug) 133 printf(" [%d -> %d]", s, val); 134 #endif 135 if (val > best_val) { 136 best_val = val; 137 best_if = cur_if; 138 } 139 } 140 #ifdef NETIF_DEBUG 141 if (netif_debug) 142 printf("\n"); 143 #endif 144 } 145 } 146 147 if (best_if.nif_driver == NULL) 148 return NULL; 149 150 best_if.nif_driver->netif_ifs[best_if.nif_unit].dif_used |= 151 (1 << best_if.nif_sel); 152 153 #ifdef NETIF_DEBUG 154 if (netif_debug) 155 printf("netif_select: %s%d(%d) wins\n", 156 best_if.nif_driver->netif_bname, 157 best_if.nif_unit, best_if.nif_sel); 158 #endif 159 return &best_if; 160 } 161 162 int 163 netif_probe(struct netif *nif, void *machdep_hint) 164 { 165 struct netif_driver *drv = nif->nif_driver; 166 167 #ifdef NETIF_DEBUG 168 if (netif_debug) 169 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 170 #endif 171 return drv->netif_probe(nif, machdep_hint); 172 } 173 174 void 175 netif_attach(struct netif *nif, struct iodesc *desc, 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_attach\n", drv->netif_bname, nif->nif_unit); 182 #endif 183 desc->io_netif = nif; 184 #ifdef PARANOID 185 if (drv->netif_init == NULL) 186 panic("%s%d: no netif_init support", drv->netif_bname, 187 nif->nif_unit); 188 #endif 189 drv->netif_init(desc, machdep_hint); 190 bzero(drv->netif_ifs[nif->nif_unit].dif_stats, 191 sizeof(struct netif_stats)); 192 } 193 194 void 195 netif_detach(struct netif *nif) 196 { 197 struct netif_driver *drv = nif->nif_driver; 198 199 #ifdef NETIF_DEBUG 200 if (netif_debug) 201 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 202 #endif 203 #ifdef PARANOID 204 if (drv->netif_end == NULL) 205 panic("%s%d: no netif_end support", drv->netif_bname, 206 nif->nif_unit); 207 #endif 208 drv->netif_end(nif); 209 } 210 211 ssize_t 212 netif_get(struct iodesc *desc, void *pkt, size_t len, time_t timo) 213 { 214 #ifdef NETIF_DEBUG 215 struct netif *nif = desc->io_netif; 216 #endif 217 struct netif_driver *drv = desc->io_netif->nif_driver; 218 ssize_t rv; 219 220 #ifdef NETIF_DEBUG 221 if (netif_debug) 222 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 223 #endif 224 #ifdef PARANOID 225 if (drv->netif_get == NULL) 226 panic("%s%d: no netif_get support", drv->netif_bname, 227 nif->nif_unit); 228 #endif 229 rv = drv->netif_get(desc, pkt, len, timo); 230 #ifdef NETIF_DEBUG 231 if (netif_debug) 232 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 233 nif->nif_unit, rv); 234 #endif 235 return rv; 236 } 237 238 ssize_t 239 netif_put(struct iodesc *desc, void *pkt, size_t len) 240 { 241 #ifdef NETIF_DEBUG 242 struct netif *nif = desc->io_netif; 243 #endif 244 struct netif_driver *drv = desc->io_netif->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, rv); 261 #endif 262 return rv; 263 } 264 265 struct iodesc * 266 socktodesc(sock) 267 int sock; 268 { 269 if (sock >= SOPEN_MAX) { 270 errno = EBADF; 271 return (NULL); 272 } 273 return (&sockets[sock]); 274 } 275 276 int 277 netif_open(void *machdep_hint) 278 { 279 int fd; 280 struct iodesc *s; 281 struct netif *nif; 282 283 /* find a free socket */ 284 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 285 if (s->io_netif == (struct netif *)0) 286 goto fnd; 287 errno = EMFILE; 288 return (-1); 289 290 fnd: 291 bzero(s, sizeof(*s)); 292 netif_init(); 293 nif = netif_select(machdep_hint); 294 if (!nif) 295 panic("netboot: no interfaces left untried"); 296 if (netif_probe(nif, machdep_hint)) { 297 printf("netboot: couldn't probe %s%d\n", 298 nif->nif_driver->netif_bname, nif->nif_unit); 299 errno = EINVAL; 300 return(-1); 301 } 302 netif_attach(nif, s, machdep_hint); 303 304 return(fd); 305 } 306 307 int 308 netif_close(int sock) 309 { 310 if (sock >= SOPEN_MAX) { 311 errno = EBADF; 312 return(-1); 313 } 314 netif_detach(sockets[sock].io_netif); 315 sockets[sock].io_netif = (struct netif *)0; 316 317 return(0); 318 } 319