Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netgraph/ng_iface.c
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1 /* 2 * ng_iface.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Archie Cobbs <archie@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 42 */ 43 44 /* 45 * This node is also a system networking interface. It has 46 * a hook for each protocol (IP, AppleTalk, etc). Packets 47 * are simply relayed between the interface and the hooks. 48 * 49 * Interfaces are named ng0, ng1, etc. New nodes take the 50 * first available interface name. 51 * 52 * This node also includes Berkeley packet filter support. 53 */ 54 55 #include "opt_inet.h" 56 #include "opt_inet6.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/errno.h> 61 #include <sys/kernel.h> 62 #include <sys/lock.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/errno.h> 66 #include <sys/proc.h> 67 #include <sys/random.h> 68 #include <sys/rmlock.h> 69 #include <sys/sockio.h> 70 #include <sys/socket.h> 71 #include <sys/sysctl.h> 72 #include <sys/syslog.h> 73 #include <sys/libkern.h> 74 75 #include <net/if.h> 76 #include <net/if_var.h> 77 #include <net/if_types.h> 78 #include <net/bpf.h> 79 #include <net/netisr.h> 80 #include <net/route.h> 81 #include <net/vnet.h> 82 83 #include <netinet/in.h> 84 85 #include <netgraph/ng_message.h> 86 #include <netgraph/netgraph.h> 87 #include <netgraph/ng_parse.h> 88 #include <netgraph/ng_iface.h> 89 90 #ifdef NG_SEPARATE_MALLOC 91 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node"); 92 #else 93 #define M_NETGRAPH_IFACE M_NETGRAPH 94 #endif 95 96 static SYSCTL_NODE(_net_graph, OID_AUTO, iface, CTLFLAG_RW, 0, 97 "Point to point netgraph interface"); 98 VNET_DEFINE_STATIC(int, ng_iface_max_nest) = 2; 99 #define V_ng_iface_max_nest VNET(ng_iface_max_nest) 100 SYSCTL_INT(_net_graph_iface, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW, 101 &VNET_NAME(ng_iface_max_nest), 0, "Max nested tunnels"); 102 103 /* This struct describes one address family */ 104 struct iffam { 105 sa_family_t family; /* Address family */ 106 const char *hookname; /* Name for hook */ 107 }; 108 typedef const struct iffam *iffam_p; 109 110 /* List of address families supported by our interface */ 111 const static struct iffam gFamilies[] = { 112 { AF_INET, NG_IFACE_HOOK_INET }, 113 { AF_INET6, NG_IFACE_HOOK_INET6 }, 114 }; 115 #define NUM_FAMILIES nitems(gFamilies) 116 117 /* Node private data */ 118 struct ng_iface_private { 119 struct ifnet *ifp; /* Our interface */ 120 int unit; /* Interface unit number */ 121 node_p node; /* Our netgraph node */ 122 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 123 struct rmlock lock; /* Protect private data changes */ 124 }; 125 typedef struct ng_iface_private *priv_p; 126 127 #define PRIV_RLOCK(priv, t) rm_rlock(&priv->lock, t) 128 #define PRIV_RUNLOCK(priv, t) rm_runlock(&priv->lock, t) 129 #define PRIV_WLOCK(priv) rm_wlock(&priv->lock) 130 #define PRIV_WUNLOCK(priv) rm_wunlock(&priv->lock) 131 132 /* Interface methods */ 133 static void ng_iface_start(struct ifnet *ifp); 134 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 135 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 136 const struct sockaddr *dst, struct route *ro); 137 static void ng_iface_bpftap(struct ifnet *ifp, 138 struct mbuf *m, sa_family_t family); 139 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 140 sa_family_t sa); 141 #ifdef DEBUG 142 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 143 #endif 144 145 /* Netgraph methods */ 146 static int ng_iface_mod_event(module_t, int, void *); 147 static ng_constructor_t ng_iface_constructor; 148 static ng_rcvmsg_t ng_iface_rcvmsg; 149 static ng_shutdown_t ng_iface_shutdown; 150 static ng_newhook_t ng_iface_newhook; 151 static ng_rcvdata_t ng_iface_rcvdata; 152 static ng_disconnect_t ng_iface_disconnect; 153 154 /* Helper stuff */ 155 static iffam_p get_iffam_from_af(sa_family_t family); 156 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 157 static iffam_p get_iffam_from_name(const char *name); 158 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 159 160 /* List of commands and how to convert arguments to/from ASCII */ 161 static const struct ng_cmdlist ng_iface_cmds[] = { 162 { 163 NGM_IFACE_COOKIE, 164 NGM_IFACE_GET_IFNAME, 165 "getifname", 166 NULL, 167 &ng_parse_string_type 168 }, 169 { 170 NGM_IFACE_COOKIE, 171 NGM_IFACE_POINT2POINT, 172 "point2point", 173 NULL, 174 NULL 175 }, 176 { 177 NGM_IFACE_COOKIE, 178 NGM_IFACE_BROADCAST, 179 "broadcast", 180 NULL, 181 NULL 182 }, 183 { 184 NGM_IFACE_COOKIE, 185 NGM_IFACE_GET_IFINDEX, 186 "getifindex", 187 NULL, 188 &ng_parse_uint32_type 189 }, 190 { 0 } 191 }; 192 193 /* Node type descriptor */ 194 static struct ng_type typestruct = { 195 .version = NG_ABI_VERSION, 196 .name = NG_IFACE_NODE_TYPE, 197 .mod_event = ng_iface_mod_event, 198 .constructor = ng_iface_constructor, 199 .rcvmsg = ng_iface_rcvmsg, 200 .shutdown = ng_iface_shutdown, 201 .newhook = ng_iface_newhook, 202 .rcvdata = ng_iface_rcvdata, 203 .disconnect = ng_iface_disconnect, 204 .cmdlist = ng_iface_cmds, 205 }; 206 NETGRAPH_INIT(iface, &typestruct); 207 208 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit); 209 #define V_ng_iface_unit VNET(ng_iface_unit) 210 211 /************************************************************************ 212 HELPER STUFF 213 ************************************************************************/ 214 215 /* 216 * Get the family descriptor from the family ID 217 */ 218 static __inline iffam_p 219 get_iffam_from_af(sa_family_t family) 220 { 221 iffam_p iffam; 222 int k; 223 224 for (k = 0; k < NUM_FAMILIES; k++) { 225 iffam = &gFamilies[k]; 226 if (iffam->family == family) 227 return (iffam); 228 } 229 return (NULL); 230 } 231 232 /* 233 * Get the family descriptor from the hook 234 */ 235 static __inline iffam_p 236 get_iffam_from_hook(priv_p priv, hook_p hook) 237 { 238 int k; 239 240 for (k = 0; k < NUM_FAMILIES; k++) 241 if (priv->hooks[k] == hook) 242 return (&gFamilies[k]); 243 return (NULL); 244 } 245 246 /* 247 * Get the hook from the iffam descriptor 248 */ 249 250 static __inline hook_p * 251 get_hook_from_iffam(priv_p priv, iffam_p iffam) 252 { 253 return (&priv->hooks[iffam - gFamilies]); 254 } 255 256 /* 257 * Get the iffam descriptor from the name 258 */ 259 static __inline iffam_p 260 get_iffam_from_name(const char *name) 261 { 262 iffam_p iffam; 263 int k; 264 265 for (k = 0; k < NUM_FAMILIES; k++) { 266 iffam = &gFamilies[k]; 267 if (!strcmp(iffam->hookname, name)) 268 return (iffam); 269 } 270 return (NULL); 271 } 272 273 /************************************************************************ 274 INTERFACE STUFF 275 ************************************************************************/ 276 277 /* 278 * Process an ioctl for the virtual interface 279 */ 280 static int 281 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 282 { 283 struct ifreq *const ifr = (struct ifreq *) data; 284 int error = 0; 285 286 #ifdef DEBUG 287 ng_iface_print_ioctl(ifp, command, data); 288 #endif 289 switch (command) { 290 291 /* These two are mostly handled at a higher layer */ 292 case SIOCSIFADDR: 293 ifp->if_flags |= IFF_UP; 294 ifp->if_drv_flags |= IFF_DRV_RUNNING; 295 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 296 break; 297 case SIOCGIFADDR: 298 break; 299 300 /* Set flags */ 301 case SIOCSIFFLAGS: 302 /* 303 * If the interface is marked up and stopped, then start it. 304 * If it is marked down and running, then stop it. 305 */ 306 if (ifr->ifr_flags & IFF_UP) { 307 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 308 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 309 ifp->if_drv_flags |= IFF_DRV_RUNNING; 310 } 311 } else { 312 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 313 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 314 IFF_DRV_OACTIVE); 315 } 316 break; 317 318 /* Set the interface MTU */ 319 case SIOCSIFMTU: 320 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 321 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 322 error = EINVAL; 323 else 324 ifp->if_mtu = ifr->ifr_mtu; 325 break; 326 327 /* Stuff that's not supported */ 328 case SIOCADDMULTI: 329 case SIOCDELMULTI: 330 error = 0; 331 break; 332 case SIOCSIFPHYS: 333 error = EOPNOTSUPP; 334 break; 335 336 default: 337 error = EINVAL; 338 break; 339 } 340 return (error); 341 } 342 343 /* 344 * This routine is called to deliver a packet out the interface. 345 * We simply look at the address family and relay the packet to 346 * the corresponding hook, if it exists and is connected. 347 */ 348 349 static int 350 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 351 const struct sockaddr *dst, struct route *ro) 352 { 353 uint32_t af; 354 int error; 355 356 /* Check interface flags */ 357 if (!((ifp->if_flags & IFF_UP) && 358 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 359 m_freem(m); 360 return (ENETDOWN); 361 } 362 363 /* Protect from deadly infinite recursion. */ 364 error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE, 365 V_ng_iface_max_nest); 366 if (error) { 367 m_freem(m); 368 return (error); 369 } 370 371 /* BPF writes need to be handled specially. */ 372 if (dst->sa_family == AF_UNSPEC) 373 bcopy(dst->sa_data, &af, sizeof(af)); 374 else 375 af = dst->sa_family; 376 377 /* Berkeley packet filter */ 378 ng_iface_bpftap(ifp, m, af); 379 380 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 381 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 382 if (m == NULL) { 383 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 384 return (ENOBUFS); 385 } 386 *(sa_family_t *)m->m_data = af; 387 error = (ifp->if_transmit)(ifp, m); 388 } else 389 error = ng_iface_send(ifp, m, af); 390 391 return (error); 392 } 393 394 /* 395 * Start method is used only when ALTQ is enabled. 396 */ 397 static void 398 ng_iface_start(struct ifnet *ifp) 399 { 400 struct mbuf *m; 401 sa_family_t sa; 402 403 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 404 405 for(;;) { 406 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 407 if (m == NULL) 408 break; 409 sa = *mtod(m, sa_family_t *); 410 m_adj(m, sizeof(sa_family_t)); 411 ng_iface_send(ifp, m, sa); 412 } 413 } 414 415 /* 416 * Flash a packet by the BPF (requires prepending 4 byte AF header) 417 * Note the phoney mbuf; this is OK because BPF treats it read-only. 418 */ 419 static void 420 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 421 { 422 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 423 if (bpf_peers_present(ifp->if_bpf)) { 424 int32_t family4 = (int32_t)family; 425 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 426 } 427 } 428 429 /* 430 * This routine does actual delivery of the packet into the 431 * netgraph(4). It is called from ng_iface_start() and 432 * ng_iface_output(). 433 */ 434 static int 435 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 436 { 437 struct rm_priotracker priv_tracker; 438 const priv_p priv = (priv_p) ifp->if_softc; 439 const iffam_p iffam = get_iffam_from_af(sa); 440 hook_p hook; 441 int error; 442 int len; 443 444 /* Check address family to determine hook (if known) */ 445 if (iffam == NULL) { 446 m_freem(m); 447 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 448 return (EAFNOSUPPORT); 449 } 450 451 /* Copy length before the mbuf gets invalidated. */ 452 len = m->m_pkthdr.len; 453 454 PRIV_RLOCK(priv, &priv_tracker); 455 hook = *get_hook_from_iffam(priv, iffam); 456 if (hook == NULL) { 457 NG_FREE_M(m); 458 PRIV_RUNLOCK(priv, &priv_tracker); 459 return ENETDOWN; 460 } 461 NG_HOOK_REF(hook); 462 PRIV_RUNLOCK(priv, &priv_tracker); 463 464 NG_OUTBOUND_THREAD_REF(); 465 NG_SEND_DATA_ONLY(error, hook, m); 466 NG_OUTBOUND_THREAD_UNREF(); 467 NG_HOOK_UNREF(hook); 468 469 /* Update stats. */ 470 if (error == 0) { 471 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 472 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 473 } 474 475 return (error); 476 } 477 478 #ifdef DEBUG 479 /* 480 * Display an ioctl to the virtual interface 481 */ 482 483 static void 484 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 485 { 486 char *str; 487 488 switch (command & IOC_DIRMASK) { 489 case IOC_VOID: 490 str = "IO"; 491 break; 492 case IOC_OUT: 493 str = "IOR"; 494 break; 495 case IOC_IN: 496 str = "IOW"; 497 break; 498 case IOC_INOUT: 499 str = "IORW"; 500 break; 501 default: 502 str = "IO??"; 503 } 504 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 505 ifp->if_xname, 506 str, 507 IOCGROUP(command), 508 command & 0xff, 509 IOCPARM_LEN(command)); 510 } 511 #endif /* DEBUG */ 512 513 /************************************************************************ 514 NETGRAPH NODE STUFF 515 ************************************************************************/ 516 517 /* 518 * Constructor for a node 519 */ 520 static int 521 ng_iface_constructor(node_p node) 522 { 523 struct ifnet *ifp; 524 priv_p priv; 525 526 /* Allocate node and interface private structures */ 527 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 528 ifp = if_alloc(IFT_PROPVIRTUAL); 529 if (ifp == NULL) { 530 free(priv, M_NETGRAPH_IFACE); 531 return (ENOMEM); 532 } 533 534 rm_init(&priv->lock, "ng_iface private rmlock"); 535 536 /* Link them together */ 537 ifp->if_softc = priv; 538 priv->ifp = ifp; 539 540 /* Get an interface unit number */ 541 priv->unit = alloc_unr(V_ng_iface_unit); 542 543 /* Link together node and private info */ 544 NG_NODE_SET_PRIVATE(node, priv); 545 priv->node = node; 546 547 /* Initialize interface structure */ 548 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 549 ifp->if_output = ng_iface_output; 550 ifp->if_start = ng_iface_start; 551 ifp->if_ioctl = ng_iface_ioctl; 552 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 553 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 554 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 555 ifp->if_addrlen = 0; /* XXX */ 556 ifp->if_hdrlen = 0; /* XXX */ 557 ifp->if_baudrate = 64000; /* XXX */ 558 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 559 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 560 IFQ_SET_READY(&ifp->if_snd); 561 562 /* Give this node the same name as the interface (if possible) */ 563 if (ng_name_node(node, ifp->if_xname) != 0) 564 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 565 ifp->if_xname); 566 567 /* Attach the interface */ 568 if_attach(ifp); 569 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 570 571 /* Done */ 572 return (0); 573 } 574 575 /* 576 * Give our ok for a hook to be added 577 */ 578 static int 579 ng_iface_newhook(node_p node, hook_p hook, const char *name) 580 { 581 const iffam_p iffam = get_iffam_from_name(name); 582 const priv_p priv = NG_NODE_PRIVATE(node); 583 hook_p *hookptr; 584 585 if (iffam == NULL) 586 return (EPFNOSUPPORT); 587 PRIV_WLOCK(priv); 588 hookptr = get_hook_from_iffam(priv, iffam); 589 if (*hookptr != NULL) { 590 PRIV_WUNLOCK(priv); 591 return (EISCONN); 592 } 593 *hookptr = hook; 594 NG_HOOK_HI_STACK(hook); 595 NG_HOOK_SET_TO_INBOUND(hook); 596 PRIV_WUNLOCK(priv); 597 return (0); 598 } 599 600 /* 601 * Receive a control message 602 */ 603 static int 604 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 605 { 606 const priv_p priv = NG_NODE_PRIVATE(node); 607 struct ifnet *const ifp = priv->ifp; 608 struct ng_mesg *resp = NULL; 609 int error = 0; 610 struct ng_mesg *msg; 611 612 NGI_GET_MSG(item, msg); 613 switch (msg->header.typecookie) { 614 case NGM_IFACE_COOKIE: 615 switch (msg->header.cmd) { 616 case NGM_IFACE_GET_IFNAME: 617 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 618 if (resp == NULL) { 619 error = ENOMEM; 620 break; 621 } 622 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 623 break; 624 625 case NGM_IFACE_POINT2POINT: 626 case NGM_IFACE_BROADCAST: 627 { 628 629 /* Deny request if interface is UP */ 630 if ((ifp->if_flags & IFF_UP) != 0) 631 return (EBUSY); 632 633 /* Change flags */ 634 switch (msg->header.cmd) { 635 case NGM_IFACE_POINT2POINT: 636 ifp->if_flags |= IFF_POINTOPOINT; 637 ifp->if_flags &= ~IFF_BROADCAST; 638 break; 639 case NGM_IFACE_BROADCAST: 640 ifp->if_flags &= ~IFF_POINTOPOINT; 641 ifp->if_flags |= IFF_BROADCAST; 642 break; 643 } 644 break; 645 } 646 647 case NGM_IFACE_GET_IFINDEX: 648 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 649 if (resp == NULL) { 650 error = ENOMEM; 651 break; 652 } 653 *((uint32_t *)resp->data) = priv->ifp->if_index; 654 break; 655 656 default: 657 error = EINVAL; 658 break; 659 } 660 break; 661 case NGM_FLOW_COOKIE: 662 switch (msg->header.cmd) { 663 case NGM_LINK_IS_UP: 664 if_link_state_change(ifp, LINK_STATE_UP); 665 break; 666 case NGM_LINK_IS_DOWN: 667 if_link_state_change(ifp, LINK_STATE_DOWN); 668 break; 669 default: 670 break; 671 } 672 break; 673 default: 674 error = EINVAL; 675 break; 676 } 677 NG_RESPOND_MSG(error, node, item, resp); 678 NG_FREE_MSG(msg); 679 return (error); 680 } 681 682 /* 683 * Recive data from a hook. Pass the packet to the correct input routine. 684 */ 685 static int 686 ng_iface_rcvdata(hook_p hook, item_p item) 687 { 688 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 689 const iffam_p iffam = get_iffam_from_hook(priv, hook); 690 struct ifnet *const ifp = priv->ifp; 691 struct mbuf *m; 692 int isr; 693 694 NGI_GET_M(item, m); 695 NG_FREE_ITEM(item); 696 /* Sanity checks */ 697 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 698 M_ASSERTPKTHDR(m); 699 if ((ifp->if_flags & IFF_UP) == 0) { 700 NG_FREE_M(m); 701 return (ENETDOWN); 702 } 703 704 /* Update interface stats */ 705 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 706 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 707 708 /* Note receiving interface */ 709 m->m_pkthdr.rcvif = ifp; 710 711 /* Berkeley packet filter */ 712 ng_iface_bpftap(ifp, m, iffam->family); 713 714 /* Send packet */ 715 switch (iffam->family) { 716 #ifdef INET 717 case AF_INET: 718 isr = NETISR_IP; 719 break; 720 #endif 721 #ifdef INET6 722 case AF_INET6: 723 isr = NETISR_IPV6; 724 break; 725 #endif 726 default: 727 m_freem(m); 728 return (EAFNOSUPPORT); 729 } 730 random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG); 731 M_SETFIB(m, ifp->if_fib); 732 CURVNET_SET(ifp->if_vnet); 733 netisr_dispatch(isr, m); 734 CURVNET_RESTORE(); 735 return (0); 736 } 737 738 /* 739 * Shutdown and remove the node and its associated interface. 740 */ 741 static int 742 ng_iface_shutdown(node_p node) 743 { 744 const priv_p priv = NG_NODE_PRIVATE(node); 745 746 /* 747 * The ifnet may be in a different vnet than the netgraph node, 748 * hence we have to change the current vnet context here. 749 */ 750 CURVNET_SET_QUIET(priv->ifp->if_vnet); 751 bpfdetach(priv->ifp); 752 if_detach(priv->ifp); 753 if_free(priv->ifp); 754 CURVNET_RESTORE(); 755 priv->ifp = NULL; 756 free_unr(V_ng_iface_unit, priv->unit); 757 rm_destroy(&priv->lock); 758 free(priv, M_NETGRAPH_IFACE); 759 NG_NODE_SET_PRIVATE(node, NULL); 760 NG_NODE_UNREF(node); 761 return (0); 762 } 763 764 /* 765 * Hook disconnection. Note that we do *not* shutdown when all 766 * hooks have been disconnected. 767 */ 768 static int 769 ng_iface_disconnect(hook_p hook) 770 { 771 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 772 const iffam_p iffam = get_iffam_from_hook(priv, hook); 773 774 if (iffam == NULL) 775 panic("%s", __func__); 776 PRIV_WLOCK(priv); 777 *get_hook_from_iffam(priv, iffam) = NULL; 778 PRIV_WUNLOCK(priv); 779 return (0); 780 } 781 782 /* 783 * Handle loading and unloading for this node type. 784 */ 785 static int 786 ng_iface_mod_event(module_t mod, int event, void *data) 787 { 788 int error = 0; 789 790 switch (event) { 791 case MOD_LOAD: 792 case MOD_UNLOAD: 793 break; 794 default: 795 error = EOPNOTSUPP; 796 break; 797 } 798 return (error); 799 } 800 801 static void 802 vnet_ng_iface_init(const void *unused) 803 { 804 805 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 806 } 807 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 808 vnet_ng_iface_init, NULL); 809 810 static void 811 vnet_ng_iface_uninit(const void *unused) 812 { 813 814 delete_unrhdr(V_ng_iface_unit); 815 } 816 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, 817 vnet_ng_iface_uninit, NULL);
Cache object: e1f52736bbbd94464eb70750db0f70f0
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