Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_eiface.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * 3 * Copyright (c) 1999-2001, Vitaly V Belekhov 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/netgraph/ng_eiface.c,v 1.17.2.3 2005/05/27 12:04:13 glebius Exp $ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/errno.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/errno.h> 38 #include <sys/sockio.h> 39 #include <sys/socket.h> 40 #include <sys/syslog.h> 41 42 #include <net/if.h> 43 #include <net/if_dl.h> 44 #include <net/if_types.h> 45 #include <net/netisr.h> 46 47 #include <netgraph/ng_message.h> 48 #include <netgraph/netgraph.h> 49 #include <netgraph/ng_parse.h> 50 #include <netgraph/ng_eiface.h> 51 52 #include <net/bpf.h> 53 #include <net/ethernet.h> 54 #include <net/if_arp.h> 55 56 static const struct ng_cmdlist ng_eiface_cmdlist[] = { 57 { 58 NGM_EIFACE_COOKIE, 59 NGM_EIFACE_GET_IFNAME, 60 "getifname", 61 NULL, 62 &ng_parse_string_type 63 }, 64 { 65 NGM_EIFACE_COOKIE, 66 NGM_EIFACE_SET, 67 "set", 68 &ng_parse_enaddr_type, 69 NULL 70 }, 71 { 0 } 72 }; 73 74 /* Node private data */ 75 struct ng_eiface_private { 76 struct arpcom arpcom; /* per-interface network data */ 77 #define sc_ifp arpcom.ac_if 78 int unit; /* Interface unit number */ 79 node_p node; /* Our netgraph node */ 80 hook_p ether; /* Hook for ethernet stream */ 81 }; 82 typedef struct ng_eiface_private *priv_p; 83 84 /* Interface methods */ 85 static void ng_eiface_init(void *xsc); 86 static void ng_eiface_start(struct ifnet *ifp); 87 static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 88 #ifdef DEBUG 89 static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 90 #endif 91 92 /* Netgraph methods */ 93 static int ng_eiface_mod_event(module_t, int, void *); 94 static ng_constructor_t ng_eiface_constructor; 95 static ng_rcvmsg_t ng_eiface_rcvmsg; 96 static ng_shutdown_t ng_eiface_rmnode; 97 static ng_newhook_t ng_eiface_newhook; 98 static ng_rcvdata_t ng_eiface_rcvdata; 99 static ng_disconnect_t ng_eiface_disconnect; 100 101 /* Node type descriptor */ 102 static struct ng_type typestruct = { 103 .version = NG_ABI_VERSION, 104 .name = NG_EIFACE_NODE_TYPE, 105 .mod_event = ng_eiface_mod_event, 106 .constructor = ng_eiface_constructor, 107 .rcvmsg = ng_eiface_rcvmsg, 108 .shutdown = ng_eiface_rmnode, 109 .newhook = ng_eiface_newhook, 110 .rcvdata = ng_eiface_rcvdata, 111 .disconnect = ng_eiface_disconnect, 112 .cmdlist = ng_eiface_cmdlist 113 }; 114 NETGRAPH_INIT(eiface, &typestruct); 115 116 static struct unrhdr *ng_eiface_unit; 117 118 /************************************************************************ 119 INTERFACE STUFF 120 ************************************************************************/ 121 122 /* 123 * Process an ioctl for the virtual interface 124 */ 125 static int 126 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 127 { 128 struct ifreq *const ifr = (struct ifreq *)data; 129 int s, error = 0; 130 131 #ifdef DEBUG 132 ng_eiface_print_ioctl(ifp, command, data); 133 #endif 134 s = splimp(); 135 switch (command) { 136 137 /* These two are mostly handled at a higher layer */ 138 case SIOCSIFADDR: 139 error = ether_ioctl(ifp, command, data); 140 break; 141 case SIOCGIFADDR: 142 break; 143 144 /* Set flags */ 145 case SIOCSIFFLAGS: 146 /* 147 * If the interface is marked up and stopped, then start it. 148 * If it is marked down and running, then stop it. 149 */ 150 if (ifr->ifr_flags & IFF_UP) { 151 if (!(ifp->if_flags & IFF_RUNNING)) { 152 ifp->if_flags &= ~(IFF_OACTIVE); 153 ifp->if_flags |= IFF_RUNNING; 154 } 155 } else { 156 if (ifp->if_flags & IFF_RUNNING) 157 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 158 } 159 break; 160 161 /* Set the interface MTU */ 162 case SIOCSIFMTU: 163 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX || 164 ifr->ifr_mtu < NG_EIFACE_MTU_MIN) 165 error = EINVAL; 166 else 167 ifp->if_mtu = ifr->ifr_mtu; 168 break; 169 170 /* Stuff that's not supported */ 171 case SIOCADDMULTI: 172 case SIOCDELMULTI: 173 error = 0; 174 break; 175 case SIOCSIFPHYS: 176 error = EOPNOTSUPP; 177 break; 178 179 default: 180 error = EINVAL; 181 break; 182 } 183 splx(s); 184 return (error); 185 } 186 187 static void 188 ng_eiface_init(void *xsc) 189 { 190 priv_p sc = xsc; 191 struct ifnet *ifp = &sc->sc_ifp; 192 int s; 193 194 s = splimp(); 195 196 ifp->if_flags |= IFF_RUNNING; 197 ifp->if_flags &= ~IFF_OACTIVE; 198 199 splx(s); 200 } 201 202 /* 203 * We simply relay the packet to the "ether" hook, if it is connected. 204 * We have been through the netgraph locking and are guaranteed to 205 * be the only code running in this node at this time. 206 */ 207 static void 208 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2) 209 { 210 struct ifnet *ifp = arg1; 211 const priv_p priv = (priv_p)ifp->if_softc; 212 int len, error = 0; 213 struct mbuf *m; 214 215 /* Check interface flags */ 216 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 217 return; 218 219 /* Don't do anything if output is active */ 220 if (ifp->if_flags & IFF_OACTIVE) 221 return; 222 223 ifp->if_flags |= IFF_OACTIVE; 224 225 /* 226 * Grab a packet to transmit. 227 */ 228 IF_DEQUEUE(&ifp->if_snd, m); 229 230 /* If there's nothing to send, return. */ 231 if (m == NULL) { 232 ifp->if_flags &= ~IFF_OACTIVE; 233 return; 234 } 235 236 /* 237 * Berkeley packet filter. 238 * Pass packet to bpf if there is a listener. 239 * XXX is this safe? locking? 240 */ 241 BPF_MTAP(ifp, m); 242 243 /* Copy length before the mbuf gets invalidated */ 244 len = m->m_pkthdr.len; 245 246 /* 247 * Send packet; if hook is not connected, mbuf will get 248 * freed. 249 */ 250 NG_SEND_DATA_ONLY(error, priv->ether, m); 251 252 /* Update stats */ 253 if (error == 0) { 254 ifp->if_obytes += len; 255 ifp->if_opackets++; 256 } 257 258 ifp->if_flags &= ~IFF_OACTIVE; 259 260 return; 261 } 262 263 /* 264 * This routine is called to deliver a packet out the interface. 265 * We simply queue the netgraph version to be called when netgraph locking 266 * allows it to happen. 267 * Until we know what the rest of the networking code is doing for 268 * locking, we don't know how we will interact with it. 269 * Take comfort from the fact that the ifnet struct is part of our 270 * private info and can't go away while we are queued. 271 * [Though we don't know it is still there now....] 272 * it is possible we don't gain anything from this because 273 * we would like to get the mbuf and queue it as data 274 * somehow, but we can't and if we did would we solve anything? 275 */ 276 static void 277 ng_eiface_start(struct ifnet *ifp) 278 { 279 280 const priv_p priv = (priv_p)ifp->if_softc; 281 282 ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0); 283 } 284 285 #ifdef DEBUG 286 /* 287 * Display an ioctl to the virtual interface 288 */ 289 290 static void 291 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 292 { 293 char *str; 294 295 switch (command & IOC_DIRMASK) { 296 case IOC_VOID: 297 str = "IO"; 298 break; 299 case IOC_OUT: 300 str = "IOR"; 301 break; 302 case IOC_IN: 303 str = "IOW"; 304 break; 305 case IOC_INOUT: 306 str = "IORW"; 307 break; 308 default: 309 str = "IO??"; 310 } 311 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 312 ifp->if_xname, 313 str, 314 IOCGROUP(command), 315 command & 0xff, 316 IOCPARM_LEN(command)); 317 } 318 #endif /* DEBUG */ 319 320 /************************************************************************ 321 NETGRAPH NODE STUFF 322 ************************************************************************/ 323 324 /* 325 * Constructor for a node 326 */ 327 static int 328 ng_eiface_constructor(node_p node) 329 { 330 struct ifnet *ifp; 331 priv_p priv; 332 333 /* Allocate node and interface private structures */ 334 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 335 if (priv == NULL) 336 return (ENOMEM); 337 338 ifp = &(priv->arpcom.ac_if); 339 340 /* Link them together */ 341 ifp->if_softc = priv; 342 343 /* Get an interface unit number */ 344 priv->unit = alloc_unr(ng_eiface_unit); 345 346 /* Link together node and private info */ 347 NG_NODE_SET_PRIVATE(node, priv); 348 priv->node = node; 349 350 /* Initialize interface structure */ 351 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit); 352 ifp->if_init = ng_eiface_init; 353 ifp->if_output = ether_output; 354 ifp->if_start = ng_eiface_start; 355 ifp->if_ioctl = ng_eiface_ioctl; 356 ifp->if_watchdog = NULL; 357 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 358 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST); 359 360 #if 0 361 /* Give this node name */ 362 bzero(ifname, sizeof(ifname)); 363 sprintf(ifname, "if%s", ifp->if_xname); 364 (void)ng_name_node(node, ifname); 365 #endif 366 367 /* Attach the interface */ 368 ether_ifattach(ifp, priv->arpcom.ac_enaddr); 369 370 /* Done */ 371 return (0); 372 } 373 374 /* 375 * Give our ok for a hook to be added 376 */ 377 static int 378 ng_eiface_newhook(node_p node, hook_p hook, const char *name) 379 { 380 priv_p priv = NG_NODE_PRIVATE(node); 381 382 if (strcmp(name, NG_EIFACE_HOOK_ETHER)) 383 return (EPFNOSUPPORT); 384 if (priv->ether != NULL) 385 return (EISCONN); 386 priv->ether = hook; 387 NG_HOOK_SET_PRIVATE(hook, &priv->ether); 388 389 return (0); 390 } 391 392 /* 393 * Receive a control message 394 */ 395 static int 396 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook) 397 { 398 const priv_p priv = NG_NODE_PRIVATE(node); 399 struct ifnet *const ifp = &priv->sc_ifp; 400 struct ng_mesg *resp = NULL; 401 int error = 0; 402 struct ng_mesg *msg; 403 404 NGI_GET_MSG(item, msg); 405 switch (msg->header.typecookie) { 406 case NGM_EIFACE_COOKIE: 407 switch (msg->header.cmd) { 408 409 case NGM_EIFACE_SET: 410 { 411 struct ether_addr *eaddr; 412 struct ifaddr *ifa; 413 struct sockaddr_dl *sdl; 414 415 if (msg->header.arglen != sizeof(struct ether_addr)) { 416 error = EINVAL; 417 break; 418 } 419 eaddr = (struct ether_addr *)(msg->data); 420 bcopy(eaddr, priv->arpcom.ac_enaddr, ETHER_ADDR_LEN); 421 422 /* And put it in the ifaddr list */ 423 TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) { 424 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 425 if (sdl->sdl_type == IFT_ETHER) { 426 bcopy((IFP2AC(ifp))->ac_enaddr, 427 LLADDR(sdl), ifp->if_addrlen); 428 break; 429 } 430 } 431 break; 432 } 433 434 case NGM_EIFACE_GET_IFNAME: 435 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 436 if (resp == NULL) { 437 error = ENOMEM; 438 break; 439 } 440 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 441 break; 442 443 case NGM_EIFACE_GET_IFADDRS: 444 { 445 struct ifaddr *ifa; 446 caddr_t ptr; 447 int buflen; 448 449 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len) 450 451 /* Determine size of response and allocate it */ 452 buflen = 0; 453 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 454 buflen += SA_SIZE(ifa->ifa_addr); 455 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT); 456 if (resp == NULL) { 457 error = ENOMEM; 458 break; 459 } 460 461 /* Add addresses */ 462 ptr = resp->data; 463 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 464 const int len = SA_SIZE(ifa->ifa_addr); 465 466 if (buflen < len) { 467 log(LOG_ERR, "%s: len changed?\n", 468 ifp->if_xname); 469 break; 470 } 471 bcopy(ifa->ifa_addr, ptr, len); 472 ptr += len; 473 buflen -= len; 474 } 475 break; 476 #undef SA_SIZE 477 } 478 479 default: 480 error = EINVAL; 481 break; 482 } /* end of inner switch() */ 483 break; 484 default: 485 error = EINVAL; 486 break; 487 } 488 NG_RESPOND_MSG(error, node, item, resp); 489 NG_FREE_MSG(msg); 490 return (error); 491 } 492 493 /* 494 * Receive data from a hook. Pass the packet to the ether_input routine. 495 */ 496 static int 497 ng_eiface_rcvdata(hook_p hook, item_p item) 498 { 499 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 500 struct ifnet *const ifp = &priv->sc_ifp; 501 struct mbuf *m; 502 503 NGI_GET_M(item, m); 504 NG_FREE_ITEM(item); 505 506 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != 507 (IFF_UP | IFF_RUNNING)) { 508 NG_FREE_M(m); 509 return (ENETDOWN); 510 } 511 512 if (m->m_len < ETHER_HDR_LEN) { 513 m = m_pullup(m, ETHER_HDR_LEN); 514 if (m == NULL) 515 return (EINVAL); 516 } 517 518 /* Note receiving interface */ 519 m->m_pkthdr.rcvif = ifp; 520 521 /* Update interface stats */ 522 ifp->if_ipackets++; 523 524 (*ifp->if_input)(ifp, m); 525 526 /* Done */ 527 return (0); 528 } 529 530 /* 531 * Shutdown processing. 532 */ 533 static int 534 ng_eiface_rmnode(node_p node) 535 { 536 const priv_p priv = NG_NODE_PRIVATE(node); 537 struct ifnet *const ifp = &priv->sc_ifp; 538 539 ether_ifdetach(ifp); 540 free_unr(ng_eiface_unit, priv->unit); 541 FREE(priv, M_NETGRAPH); 542 NG_NODE_SET_PRIVATE(node, NULL); 543 NG_NODE_UNREF(node); 544 return (0); 545 } 546 547 /* 548 * Hook disconnection 549 */ 550 static int 551 ng_eiface_disconnect(hook_p hook) 552 { 553 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 554 555 priv->ether = NULL; 556 return (0); 557 } 558 559 /* 560 * Handle loading and unloading for this node type. 561 */ 562 static int 563 ng_eiface_mod_event(module_t mod, int event, void *data) 564 { 565 int error = 0; 566 567 switch (event) { 568 case MOD_LOAD: 569 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL); 570 break; 571 case MOD_UNLOAD: 572 delete_unrhdr(ng_eiface_unit); 573 break; 574 default: 575 error = EOPNOTSUPP; 576 break; 577 } 578 return (error); 579 }
Cache object: 8a47488bc5836af9ce6ad00321f89a8c
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]