1 /* $NetBSD: netif.c,v 1.24 2009/01/17 14:00:36 tsutsui 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("netif_init: called\n"); 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: netif_match (%d)\n", drv->netif_bname, 87 nif->nif_unit, 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, unit_done, 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("netif_select: %d interfaces\n", 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 unit_done = 0; 117 118 #ifdef NETIF_DEBUG 119 if (netif_debug) 120 printf("\t%s%d:", drv->netif_bname, 121 cur_if.nif_unit); 122 #endif 123 124 for (s = 0; s < drv->netif_ifs[u].dif_nsel; s++) { 125 cur_if.nif_sel = s; 126 127 if (drv->netif_ifs[u].dif_used & (1 << s)) { 128 #ifdef NETIF_DEBUG 129 if (netif_debug) 130 printf(" [%d used]", s); 131 #endif 132 continue; 133 } 134 135 val = netif_match(&cur_if, machdep_hint); 136 #ifdef NETIF_DEBUG 137 if (netif_debug) 138 printf(" [%d -> %d]", s, val); 139 #endif 140 if (val > best_val) { 141 best_val = val; 142 best_if = cur_if; 143 } 144 } 145 #ifdef NETIF_DEBUG 146 if (netif_debug) 147 printf("\n"); 148 #endif 149 } 150 } 151 152 if (best_if.nif_driver == NULL) 153 return NULL; 154 155 best_if.nif_driver-> 156 netif_ifs[best_if.nif_unit].dif_used |= (1 << best_if.nif_sel); 157 158 #ifdef NETIF_DEBUG 159 if (netif_debug) 160 printf("netif_select: %s%d(%d) wins\n", 161 best_if.nif_driver->netif_bname, 162 best_if.nif_unit, best_if.nif_sel); 163 #endif 164 return &best_if; 165 } 166 167 int 168 netif_probe(struct netif *nif, void *machdep_hint) 169 { 170 struct netif_driver *drv = nif->nif_driver; 171 172 #ifdef NETIF_DEBUG 173 if (netif_debug) 174 printf("%s%d: netif_probe\n", drv->netif_bname, nif->nif_unit); 175 #endif 176 return drv->netif_probe(nif, machdep_hint); 177 } 178 179 void 180 netif_attach(struct netif *nif, struct iodesc *desc, void *machdep_hint) 181 { 182 struct netif_driver *drv = nif->nif_driver; 183 184 #ifdef NETIF_DEBUG 185 if (netif_debug) 186 printf("%s%d: netif_attach\n", drv->netif_bname, nif->nif_unit); 187 #endif 188 desc->io_netif = nif; 189 #ifdef PARANOID 190 if (drv->netif_init == NULL) 191 panic("%s%d: no netif_init support", drv->netif_bname, 192 nif->nif_unit); 193 #endif 194 drv->netif_init(desc, machdep_hint); 195 (void)memset(drv->netif_ifs[nif->nif_unit].dif_stats, 0, 196 sizeof(struct netif_stats)); 197 } 198 199 void 200 netif_detach(struct netif *nif) 201 { 202 struct netif_driver *drv = nif->nif_driver; 203 204 #ifdef NETIF_DEBUG 205 if (netif_debug) 206 printf("%s%d: netif_detach\n", drv->netif_bname, nif->nif_unit); 207 #endif 208 #ifdef PARANOID 209 if (drv->netif_end == NULL) 210 panic("%s%d: no netif_end support", drv->netif_bname, 211 nif->nif_unit); 212 #endif 213 drv->netif_end(nif); 214 } 215 216 ssize_t 217 netif_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timo) 218 { 219 struct netif *nif = desc->io_netif; 220 struct netif_driver *drv = nif->nif_driver; 221 ssize_t rv; 222 223 #ifdef NETIF_DEBUG 224 if (netif_debug) 225 printf("%s%d: netif_get\n", drv->netif_bname, nif->nif_unit); 226 #endif 227 #ifdef PARANOID 228 if (drv->netif_get == NULL) 229 panic("%s%d: no netif_get support", drv->netif_bname, 230 nif->nif_unit); 231 #endif 232 rv = drv->netif_get(desc, pkt, len, timo); 233 #ifdef NETIF_DEBUG 234 if (netif_debug) 235 printf("%s%d: netif_get returning %d\n", drv->netif_bname, 236 nif->nif_unit, (int)rv); 237 #endif 238 return rv; 239 } 240 241 ssize_t 242 netif_put(struct iodesc *desc, void *pkt, size_t len) 243 { 244 struct netif *nif = desc->io_netif; 245 struct netif_driver *drv = nif->nif_driver; 246 ssize_t rv; 247 248 #ifdef NETIF_DEBUG 249 if (netif_debug) 250 printf("%s%d: netif_put\n", drv->netif_bname, nif->nif_unit); 251 #endif 252 #ifdef PARANOID 253 if (drv->netif_put == NULL) 254 panic("%s%d: no netif_put support", drv->netif_bname, 255 nif->nif_unit); 256 #endif 257 rv = drv->netif_put(desc, pkt, len); 258 #ifdef NETIF_DEBUG 259 if (netif_debug) 260 printf("%s%d: netif_put returning %d\n", drv->netif_bname, 261 nif->nif_unit, (int)rv); 262 #endif 263 return rv; 264 } 265 266 struct iodesc * 267 socktodesc(int sock) 268 { 269 #if !defined(LIBSA_NO_FD_CHECKING) 270 if (sock >= SOPEN_MAX) { 271 errno = EBADF; 272 return NULL; 273 } 274 #endif 275 return &sockets[sock]; 276 } 277 278 int 279 netif_open(void *machdep_hint) 280 { 281 int fd; 282 struct iodesc *s; 283 struct netif *nif; 284 285 /* find a free socket */ 286 for (fd = 0, s = sockets; fd < SOPEN_MAX; fd++, s++) 287 if (s->io_netif == (struct netif *)0) 288 goto fnd; 289 errno = EMFILE; 290 return -1; 291 292 fnd: 293 (void)memset(s, 0, sizeof(*s)); 294 netif_init(); 295 nif = netif_select(machdep_hint); 296 if (!nif) 297 panic("netboot: no interfaces left untried"); 298 if (netif_probe(nif, machdep_hint)) { 299 printf("netboot: couldn't probe %s%d\n", 300 nif->nif_driver->netif_bname, nif->nif_unit); 301 errno = EINVAL; 302 return -1; 303 } 304 netif_attach(nif, s, machdep_hint); 305 306 return fd; 307 } 308 309 int 310 netif_close(int sock) 311 { 312 #if !defined(LIBSA_NO_FD_CHECKING) 313 if (sock >= SOPEN_MAX) { 314 errno = EBADF; 315 return -1; 316 } 317 #endif 318 netif_detach(sockets[sock].io_netif); 319 sockets[sock].io_netif = (struct netif *)0; 320 321 return 0; 322 } 323