1 /* $NetBSD: netif.c,v 1.28 2025/11/28 14:46:32 nia 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. The name of the Author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/cdefs.h> 33 #include <sys/mount.h> 34 #ifdef _STANDALONE 35 #include <lib/libkern/libkern.h> 36 #else 37 #include <string.h> 38 #endif 39 40 #include <netinet/in.h> 41 #include <netinet/in_systm.h> 42 43 #include "stand.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("%s: called\n", __func__); 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 int netif_match(struct netif *, void *); 75 76 int 77 netif_match(struct netif *nif, void *machdep_hint) 78 { 79 struct netif_driver *drv = nif->nif_driver; 80 81 #if 0 82 if (netif_debug) 83 printf("%s%d: %s (%d)\n", drv->netif_bname, 84 nif->nif_unit, __func__, nif->nif_sel); 85 #endif 86 return drv->netif_match(nif, machdep_hint); 87 } 88 89 struct netif * 90 netif_select(void *machdep_hint) 91 { 92 int d, u, s; 93 struct netif_driver *drv; 94 struct netif cur_if; 95 static struct netif best_if; 96 int best_val; 97 int val; 98 99 best_val = 0; 100 best_if.nif_driver = NULL; 101 102 #ifdef NETIF_DEBUG 103 if (netif_debug) 104 printf("%s: %d interfaces\n", __func__, n_netif_drivers); 105 #endif 106 107 for (d = 0; d < n_netif_drivers; d++) { 108 cur_if.nif_driver = netif_drivers[d]; 109 drv = cur_if.nif_driver; 110 111 for (u = 0; u < drv->netif_nifs; u++) { 112 cur_if.nif_unit = u; 113 114 #ifdef NETIF_DEBUG 115 if (netif_debug) 116 printf("\t%s%d:", drv->netif_bname, 117 cur_if.nif_unit); 118 #endif 119 120 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 121 cur_if.nif_sel = s; 122 123 if (drv->netif_ifs[u].dif_used & (1 << s)) { 124 #ifdef NETIF_DEBUG 125 if (netif_debug) 126 printf(" [%d used]", s); 127 #endif 128 continue; 129 } 130 131 val = netif_match(&cur_if, machdep_hint); 132 #ifdef NETIF_DEBUG 133 if (netif_debug) 134 printf(" [%d -> %d]", s, val); 135 #endif 136 if (val > best_val) { 137 best_val = val; 138 best_if = cur_if; 139 } 140 } 141 #ifdef NETIF_DEBUG 142 if (netif_debug) 143 printf("\n"); 144 #endif 145 } 146 } 147 148 if (best_if.nif_driver == NULL) 149 return NULL; 150 151 best_if.nif_driver-> 152 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); 153 154 #ifdef NETIF_DEBUG 155 if (netif_debug) 156 printf("%s: %s%d(%d) wins\n", __func__, 157 best_if.nif_driver->netif_bname, 158 best_if.nif_unit, best_if.nif_sel); 159 #endif 160 return &best_if; 161 } 162 163 int 164 netif_probe(struct netif *nif, void *machdep_hint) 165 { 166 struct netif_driver *drv = nif->nif_driver; 167 168 #ifdef NETIF_DEBUG 169 if (netif_debug) 170 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 171 #endif 172 return drv->netif_probe(nif, machdep_hint); 173 } 174 175 void 176 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint) 177 { 178 struct netif_driver *drv = nif->nif_driver; 179 180 #ifdef NETIF_DEBUG 181 if (netif_debug) 182 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 183 #endif 184 desc->io_netif = nif; 185 #ifdef PARANOID 186 if (drv->netif_init == NULL) 187 panic("%s%d: no netif_init support", drv->netif_bname, 188 nif->nif_unit); 189 #endif 190 drv->netif_init(desc, machdep_hint); 191 (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0, 192 sizeof(struct netif_stats)); 193 } 194 195 void 196 netif_detach(struct netif *nif) 197 { 198 struct netif_driver *drv = nif->nif_driver; 199 200 #ifdef NETIF_DEBUG 201 if (netif_debug) 202 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 203 #endif 204 #ifdef PARANOID 205 if (drv->netif_end == NULL) 206 panic("%s%d: no netif_end support", drv->netif_bname, 207 nif->nif_unit); 208 #endif 209 drv->netif_end(nif); 210 } 211 212 ssize_t 213 netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo) 214 { 215 struct netif *nif = desc->io_netif; 216 struct netif_driver *drv = nif->nif_driver; 217 ssize_t rv; 218 219 #ifdef NETIF_DEBUG 220 if (netif_debug) 221 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 222 #endif 223 #ifdef PARANOID 224 if (drv->netif_get == NULL) 225 panic("%s%d: no %s support", drv->netif_bname, 226 nif->nif_unit, __func__); 227 #endif 228 rv = drv->netif_get(desc, pkt, len, timo); 229 #ifdef NETIF_DEBUG 230 if (netif_debug) 231 printf("%s%d: %s returning %zd\n", drv->netif_bname, 232 nif->nif_unit, __func__, rv); 233 #endif 234 return rv; 235 } 236 237 ssize_t 238 netif_put(struct iodesc *desc, void *pkt, size_t len) 239 { 240 struct netif *nif = desc->io_netif; 241 struct netif_driver *drv = nif->nif_driver; 242 ssize_t rv; 243 244 #ifdef NETIF_DEBUG 245 if (netif_debug) 246 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 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: %s returning %zd\n", drv->netif_bname, 257 nif->nif_unit, __func__, rv); 258 #endif 259 return rv; 260 } 261 262 struct iodesc * 263 socktodesc(int sock) 264 { 265 #if !defined(LIBSA_NO_FD_CHECKING) 266 if (sock >= SOPEN_MAX) { 267 errno = EBADF; 268 return NULL; 269 } 270 #endif 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 == (struct netif *)0) 284 goto fnd; 285 errno = EMFILE; 286 return -1; 287 288 fnd: 289 (void)memset(s, 0, sizeof(*s)); 290 netif_init(); 291 nif = netif_select(machdep_hint); 292 if (!nif) { 293 errno = ENXIO; 294 return -1; 295 } 296 if (netif_probe(nif, machdep_hint)) { 297 printf("%s: couldn't probe %s%d\n", __func__, 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 !defined(LIBSA_NO_FD_CHECKING) 311 if (sock >= SOPEN_MAX) { 312 errno = EBADF; 313 return -1; 314 } 315 #endif 316 netif_detach(sockets[sock].io_netif); 317 sockets[sock].io_netif = (struct netif *)0; 318 319 return 0; 320 } 321
Indexes created Tue Sep 15 00:24:42 UTC 2026