1 /* $OpenBSD: netif.c,v 1.13 2021/10/25 15:59:46 patrick 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, 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; 109 110 #ifdef NETIF_DEBUG 111 if (netif_debug) 112 printf("\t%s%d:", drv->netif_bname, 113 cur_if.nif_unit); 114 #endif 115 116 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 117 cur_if.nif_sel = s; 118 119 if (drv->netif_ifs[u].dif_used & (1 << s)) { 120 #ifdef NETIF_DEBUG 121 if (netif_debug) 122 printf(" [%d used]", s); 123 #endif 124 continue; 125 } 126 127 val = netif_match(&cur_if, machdep_hint); 128 #ifdef NETIF_DEBUG 129 if (netif_debug) 130 printf(" [%d -> %d]", s, val); 131 #endif 132 if (val > best_val) { 133 best_val = val; 134 best_if = cur_if; 135 } 136 } 137 #ifdef NETIF_DEBUG 138 if (netif_debug) 139 printf("\n"); 140 #endif 141 } 142 } 143 144 if (best_if.nif_driver == NULL) 145 return NULL; 146 147 best_if.nif_driver->netif_ifs[best_if.nif_unit].dif_used |= 148 (1 << best_if.nif_sel); 149 150 #ifdef NETIF_DEBUG 151 if (netif_debug) 152 printf("netif_select: %s%d(%d) wins\n", 153 best_if.nif_driver->netif_bname, 154 best_if.nif_unit, best_if.nif_sel); 155 #endif 156 return &best_if; 157 } 158 159 int 160 netif_probe(struct netif *nif, void *machdep_hint) 161 { 162 struct netif_driver *drv = nif->nif_driver; 163 164 #ifdef NETIF_DEBUG 165 if (netif_debug) 166 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 167 #endif 168 return drv->netif_probe(nif, machdep_hint); 169 } 170 171 void 172 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint) 173 { 174 struct netif_driver *drv = nif->nif_driver; 175 176 #ifdef NETIF_DEBUG 177 if (netif_debug) 178 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit); 179 #endif 180 desc->io_netif = nif; 181 #ifdef PARANOID 182 if (drv->netif_init == NULL) 183 panic("%s%d: no netif_init support", drv->netif_bname, 184 nif->nif_unit); 185 #endif 186 drv->netif_init(desc, machdep_hint); 187 bzero(drv->netif_ifs[nif->nif_unit].dif_stats, 188 sizeof(struct netif_stats)); 189 } 190 191 void 192 netif_detach(struct netif *nif) 193 { 194 struct netif_driver *drv = nif->nif_driver; 195 196 #ifdef NETIF_DEBUG 197 if (netif_debug) 198 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 199 #endif 200 #ifdef PARANOID 201 if (drv->netif_end == NULL) 202 panic("%s%d: no netif_end support", drv->netif_bname, 203 nif->nif_unit); 204 #endif 205 drv->netif_end(nif); 206 } 207 208 ssize_t 209 netif_get(struct iodesc *desc, void *pkt, size_t len, time_t timo) 210 { 211 #ifdef NETIF_DEBUG 212 struct netif *nif = desc->io_netif; 213 #endif 214 struct netif_driver *drv = desc->io_netif->nif_driver; 215 ssize_t rv; 216 217 #ifdef NETIF_DEBUG 218 if (netif_debug) 219 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 220 #endif 221 #ifdef PARANOID 222 if (drv->netif_get == NULL) 223 panic("%s%d: no netif_get support", drv->netif_bname, 224 nif->nif_unit); 225 #endif 226 rv = drv->netif_get(desc, pkt, len, timo); 227 #ifdef NETIF_DEBUG 228 if (netif_debug) 229 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 230 nif->nif_unit, rv); 231 #endif 232 return rv; 233 } 234 235 ssize_t 236 netif_put(struct iodesc *desc, void *pkt, size_t len) 237 { 238 #ifdef NETIF_DEBUG 239 struct netif *nif = desc->io_netif; 240 #endif 241 struct netif_driver *drv = desc->io_netif->nif_driver; 242 ssize_t rv; 243 244 #ifdef NETIF_DEBUG 245 if (netif_debug) 246 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit); 247 #endif 248 #ifdef PARANOID 249 if (drv->netif_put == NULL) 250 panic("%s%d: no netif_put support", drv->netif_bname, 251 nif->nif_unit); 252 #endif 253 rv = drv->netif_put(desc, pkt, len); 254 #ifdef NETIF_DEBUG 255 if (netif_debug) 256 printf("%s%d: netif_put returning %d\n", drv->netif_bname, 257 nif->nif_unit, rv); 258 #endif 259 return rv; 260 } 261 262 struct iodesc * 263 socktodesc(sock) 264 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 == NULL) 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 = NULL; 313 314 return(0); 315 } 316