1 /* $NetBSD: netif.c,v 1.27 2023/09/14 03:08:31 rin 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/cdefs.h> 36 #include <sys/mount.h> 37 #ifdef _STANDALONE 38 #include <lib/libkern/libkern.h> 39 #else 40 #include <string.h> 41 #endif 42 43 #include <netinet/in.h> 44 #include <netinet/in_systm.h> 45 46 #include "stand.h" 47 #include "netif.h" 48 49 struct iodesc sockets[SOPEN_MAX]; 50 #ifdef NETIF_DEBUG 51 int netif_debug = 0; 52 #endif 53 54 /* 55 * netif_init: 56 * 57 * initialize the generic network interface layer 58 */ 59 60 void 61 netif_init(void) 62 { 63 struct netif_driver *drv; 64 int d, i; 65 66 #ifdef NETIF_DEBUG 67 if (netif_debug) 68 printf("%s: called\n", __func__); 69 #endif 70 for (d = 0; d < n_netif_drivers; d++) { 71 drv = netif_drivers[d]; 72 for (i = 0; i < drv->netif_nifs; i++) 73 drv->netif_ifs[i].dif_used = 0; 74 } 75 } 76 77 int netif_match(struct netif *, void *); 78 79 int 80 netif_match(struct netif *nif, void *machdep_hint) 81 { 82 struct netif_driver *drv = nif->nif_driver; 83 84 #if 0 85 if (netif_debug) 86 printf("%s%d: %s (%d)\n", drv->netif_bname, 87 nif->nif_unit, __func__, nif->nif_sel); 88 #endif 89 return drv->netif_match(nif, machdep_hint); 90 } 91 92 struct netif * 93 netif_select(void *machdep_hint) 94 { 95 int d, u, s; 96 struct netif_driver *drv; 97 struct netif cur_if; 98 static struct netif best_if; 99 int best_val; 100 int val; 101 102 best_val = 0; 103 best_if.nif_driver = NULL; 104 105 #ifdef NETIF_DEBUG 106 if (netif_debug) 107 printf("%s: %d interfaces\n", __func__, n_netif_drivers); 108 #endif 109 110 for (d = 0; d < n_netif_drivers; d++) { 111 cur_if.nif_driver = netif_drivers[d]; 112 drv = cur_if.nif_driver; 113 114 for (u = 0; u < drv->netif_nifs; u++) { 115 cur_if.nif_unit = u; 116 117 #ifdef NETIF_DEBUG 118 if (netif_debug) 119 printf("\t%s%d:", drv->netif_bname, 120 cur_if.nif_unit); 121 #endif 122 123 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 124 cur_if.nif_sel = s; 125 126 if (drv->netif_ifs[u].dif_used & (1 << s)) { 127 #ifdef NETIF_DEBUG 128 if (netif_debug) 129 printf(" [%d used]", s); 130 #endif 131 continue; 132 } 133 134 val = netif_match(&cur_if, machdep_hint); 135 #ifdef NETIF_DEBUG 136 if (netif_debug) 137 printf(" [%d -> %d]", s, val); 138 #endif 139 if (val > best_val) { 140 best_val = val; 141 best_if = cur_if; 142 } 143 } 144 #ifdef NETIF_DEBUG 145 if (netif_debug) 146 printf("\n"); 147 #endif 148 } 149 } 150 151 if (best_if.nif_driver == NULL) 152 return NULL; 153 154 best_if.nif_driver-> 155 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); 156 157 #ifdef NETIF_DEBUG 158 if (netif_debug) 159 printf("%s: %s%d(%d) wins\n", __func__, 160 best_if.nif_driver->netif_bname, 161 best_if.nif_unit, best_if.nif_sel); 162 #endif 163 return &best_if; 164 } 165 166 int 167 netif_probe(struct netif *nif, void *machdep_hint) 168 { 169 struct netif_driver *drv = nif->nif_driver; 170 171 #ifdef NETIF_DEBUG 172 if (netif_debug) 173 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 174 #endif 175 return drv->netif_probe(nif, machdep_hint); 176 } 177 178 void 179 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint) 180 { 181 struct netif_driver *drv = nif->nif_driver; 182 183 #ifdef NETIF_DEBUG 184 if (netif_debug) 185 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 186 #endif 187 desc->io_netif = nif; 188 #ifdef PARANOID 189 if (drv->netif_init == NULL) 190 panic("%s%d: no netif_init support", drv->netif_bname, 191 nif->nif_unit); 192 #endif 193 drv->netif_init(desc, machdep_hint); 194 (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0, 195 sizeof(struct netif_stats)); 196 } 197 198 void 199 netif_detach(struct netif *nif) 200 { 201 struct netif_driver *drv = nif->nif_driver; 202 203 #ifdef NETIF_DEBUG 204 if (netif_debug) 205 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 206 #endif 207 #ifdef PARANOID 208 if (drv->netif_end == NULL) 209 panic("%s%d: no netif_end support", drv->netif_bname, 210 nif->nif_unit); 211 #endif 212 drv->netif_end(nif); 213 } 214 215 ssize_t 216 netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo) 217 { 218 struct netif *nif = desc->io_netif; 219 struct netif_driver *drv = nif->nif_driver; 220 ssize_t rv; 221 222 #ifdef NETIF_DEBUG 223 if (netif_debug) 224 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 225 #endif 226 #ifdef PARANOID 227 if (drv->netif_get == NULL) 228 panic("%s%d: no %s support", drv->netif_bname, 229 nif->nif_unit, __func__); 230 #endif 231 rv = drv->netif_get(desc, pkt, len, timo); 232 #ifdef NETIF_DEBUG 233 if (netif_debug) 234 printf("%s%d: %s returning %zd\n", drv->netif_bname, 235 nif->nif_unit, __func__, rv); 236 #endif 237 return rv; 238 } 239 240 ssize_t 241 netif_put(struct iodesc *desc, void *pkt, size_t len) 242 { 243 struct netif *nif = desc->io_netif; 244 struct netif_driver *drv = nif->nif_driver; 245 ssize_t rv; 246 247 #ifdef NETIF_DEBUG 248 if (netif_debug) 249 printf("%s%d: %s\n", drv->netif_bname, nif->nif_unit, __func__); 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: %s returning %zd\n", drv->netif_bname, 260 nif->nif_unit, __func__, rv); 261 #endif 262 return rv; 263 } 264 265 struct iodesc * 266 socktodesc(int sock) 267 { 268 #if !defined(LIBSA_NO_FD_CHECKING) 269 if (sock >= SOPEN_MAX) { 270 errno = EBADF; 271 return NULL; 272 } 273 #endif 274 return &sockets[sock]; 275 } 276 277 int 278 netif_open(void *machdep_hint) 279 { 280 int fd; 281 struct iodesc *s; 282 struct netif *nif; 283 284 /* find a free socket */ 285 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 286 if (s->io_netif == (struct netif *)0) 287 goto fnd; 288 errno = EMFILE; 289 return -1; 290 291 fnd: 292 (void)memset(s, 0, sizeof(*s)); 293 netif_init(); 294 nif = netif_select(machdep_hint); 295 if (!nif) { 296 errno = ENXIO; 297 return -1; 298 } 299 if (netif_probe(nif, machdep_hint)) { 300 printf("%s: couldn't probe %s%d\n", __func__, 301 nif->nif_driver->netif_bname, nif->nif_unit); 302 errno = EINVAL; 303 return -1; 304 } 305 netif_attach(nif, s, machdep_hint); 306 307 return fd; 308 } 309 310 int 311 netif_close(int sock) 312 { 313 #if !defined(LIBSA_NO_FD_CHECKING) 314 if (sock >= SOPEN_MAX) { 315 errno = EBADF; 316 return -1; 317 } 318 #endif 319 netif_detach(sockets[sock].io_netif); 320 sockets[sock].io_netif = (struct netif *)0; 321 322 return 0; 323 } 324
Indexes created Sat Sep 20 22:09:52 GMT 2025