1 /* $OpenBSD: netif.c,v 1.12 2017/09/08 05:36:53 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/mount.h> 37 38 #include <netinet/in.h> 39 40 #include "stand.h" 41 #include "net.h" 42 #include "netif.h" 43 44 struct iodesc sockets[SOPEN_MAX]; 45 #ifdef NETIF_DEBUG 46 int netif_debug = 0; 47 #endif 48 49 /* 50 * netif_init: 51 * 52 * initialize the generic network interface layer 53 */ 54 55 void 56 netif_init(void) 57 { 58 struct netif_driver *drv; 59 int d, i; 60 61 #ifdef NETIF_DEBUG 62 if (netif_debug) 63 printf("netif_init: called\n"); 64 #endif 65 for (d = 0; d < n_netif_drivers; d++) { 66 drv = netif_drivers[d]; 67 for (i = 0; i < drv->netif_nifs; i++) 68 drv->netif_ifs[i].dif_used = 0; 69 } 70 } 71 72 static int 73 netif_match(struct netif *nif, void *machdep_hint) 74 { 75 struct netif_driver *drv = nif->nif_driver; 76 77 #if 0 78 if (netif_debug) 79 printf("%s%d: netif_match (%d)\n", drv->netif_bname, 80 nif->nif_unit, nif->nif_sel); 81 #endif 82 return drv->netif_match(nif, machdep_hint); 83 } 84 85 struct netif * 86 netif_select(void *machdep_hint) 87 { 88 int d, u, unit_done, s; 89 struct netif_driver *drv; 90 struct netif cur_if; 91 static struct netif best_if; 92 int best_val; 93 int val; 94 95 best_val = 0; 96 best_if.nif_driver = NULL; 97 98 #ifdef NETIF_DEBUG 99 if (netif_debug) 100 printf("netif_select: %d interfaces\n", n_netif_drivers); 101 #endif 102 103 for (d = 0; d < n_netif_drivers; 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->netif_ifs[best_if.nif_unit].dif_used |= 149 (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", 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", 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, size_t len, 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", drv->netif_bname, 225 nif->nif_unit); 226 #endif 227 rv = drv->netif_get(desc, pkt, len, 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, 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", 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, rv); 259 #endif 260 return rv; 261 } 262 263 struct iodesc * 264 socktodesc(sock) 265 int sock; 266 { 267 if (sock >= SOPEN_MAX) { 268 errno = EBADF; 269 return (NULL); 270 } 271 return (&sockets[sock]); 272 } 273 274 int 275 netif_open(void *machdep_hint) 276 { 277 int fd; 278 struct iodesc *s; 279 struct netif *nif; 280 281 /* find a free socket */ 282 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 283 if (s->io_netif == NULL) 284 goto fnd; 285 errno = EMFILE; 286 return (-1); 287 288 fnd: 289 bzero(s, sizeof(*s)); 290 netif_init(); 291 nif = netif_select(machdep_hint); 292 if (!nif) 293 panic("netboot: no interfaces left untried"); 294 if (netif_probe(nif, machdep_hint)) { 295 printf("netboot: couldn't probe %s%d\n", 296 nif->nif_driver->netif_bname, nif->nif_unit); 297 errno = EINVAL; 298 return(-1); 299 } 300 netif_attach(nif, s, machdep_hint); 301 302 return(fd); 303 } 304 305 int 306 netif_close(int sock) 307 { 308 if (sock >= SOPEN_MAX) { 309 errno = EBADF; 310 return(-1); 311 } 312 netif_detach(sockets[sock].io_netif); 313 sockets[sock].io_netif = NULL; 314 315 return(0); 316 } 317