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 | CTLFLAG_MPSAFE, 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 /* These two are mostly handled at a higher layer */ 291 case SIOCSIFADDR: 292 ifp->if_flags |= IFF_UP; 293 ifp->if_drv_flags |= IFF_DRV_RUNNING; 294 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 295 break; 296 case SIOCGIFADDR: 297 break; 298 299 /* Set flags */ 300 case SIOCSIFFLAGS: 301 /* 302 * If the interface is marked up and stopped, then start it. 303 * If it is marked down and running, then stop it. 304 */ 305 if (ifr->ifr_flags & IFF_UP) { 306 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 307 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 308 ifp->if_drv_flags |= IFF_DRV_RUNNING; 309 } 310 } else { 311 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 312 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 313 IFF_DRV_OACTIVE); 314 } 315 break; 316 317 /* Set the interface MTU */ 318 case SIOCSIFMTU: 319 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 320 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 321 error = EINVAL; 322 else 323 ifp->if_mtu = ifr->ifr_mtu; 324 break; 325 326 /* Stuff that's not supported */ 327 case SIOCADDMULTI: 328 case SIOCDELMULTI: 329 error = 0; 330 break; 331 case SIOCSIFPHYS: 332 error = EOPNOTSUPP; 333 break; 334 335 default: 336 error = EINVAL; 337 break; 338 } 339 return (error); 340 } 341 342 /* 343 * This routine is called to deliver a packet out the interface. 344 * We simply look at the address family and relay the packet to 345 * the corresponding hook, if it exists and is connected. 346 */ 347 348 static int 349 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 350 const struct sockaddr *dst, struct route *ro) 351 { 352 uint32_t af; 353 int error; 354 355 /* Check interface flags */ 356 if (!((ifp->if_flags & IFF_UP) && 357 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 358 m_freem(m); 359 return (ENETDOWN); 360 } 361 362 /* Protect from deadly infinite recursion. */ 363 error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE, 364 V_ng_iface_max_nest); 365 if (error) { 366 m_freem(m); 367 return (error); 368 } 369 370 /* BPF writes need to be handled specially. */ 371 if (dst->sa_family == AF_UNSPEC) 372 bcopy(dst->sa_data, &af, sizeof(af)); 373 else 374 af = RO_GET_FAMILY(ro, dst); 375 376 /* Berkeley packet filter */ 377 ng_iface_bpftap(ifp, m, af); 378 379 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 380 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 381 if (m == NULL) { 382 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 383 return (ENOBUFS); 384 } 385 *(sa_family_t *)m->m_data = af; 386 error = (ifp->if_transmit)(ifp, m); 387 } else 388 error = ng_iface_send(ifp, m, af); 389 390 return (error); 391 } 392 393 /* 394 * Start method is used only when ALTQ is enabled. 395 */ 396 static void 397 ng_iface_start(struct ifnet *ifp) 398 { 399 struct mbuf *m; 400 sa_family_t sa; 401 402 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 403 404 for(;;) { 405 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 406 if (m == NULL) 407 break; 408 sa = *mtod(m, sa_family_t *); 409 m_adj(m, sizeof(sa_family_t)); 410 ng_iface_send(ifp, m, sa); 411 } 412 } 413 414 /* 415 * Flash a packet by the BPF (requires prepending 4 byte AF header) 416 * Note the phoney mbuf; this is OK because BPF treats it read-only. 417 */ 418 static void 419 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 420 { 421 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 422 if (bpf_peers_present(ifp->if_bpf)) { 423 int32_t family4 = (int32_t)family; 424 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 425 } 426 } 427 428 /* 429 * This routine does actual delivery of the packet into the 430 * netgraph(4). It is called from ng_iface_start() and 431 * ng_iface_output(). 432 */ 433 static int 434 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 435 { 436 struct rm_priotracker priv_tracker; 437 const priv_p priv = (priv_p) ifp->if_softc; 438 const iffam_p iffam = get_iffam_from_af(sa); 439 hook_p hook; 440 int error; 441 int len; 442 443 /* Check address family to determine hook (if known) */ 444 if (iffam == NULL) { 445 m_freem(m); 446 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 447 return (EAFNOSUPPORT); 448 } 449 450 /* Copy length before the mbuf gets invalidated. */ 451 len = m->m_pkthdr.len; 452 453 PRIV_RLOCK(priv, &priv_tracker); 454 hook = *get_hook_from_iffam(priv, iffam); 455 if (hook == NULL) { 456 NG_FREE_M(m); 457 PRIV_RUNLOCK(priv, &priv_tracker); 458 return ENETDOWN; 459 } 460 NG_HOOK_REF(hook); 461 PRIV_RUNLOCK(priv, &priv_tracker); 462 463 NG_OUTBOUND_THREAD_REF(); 464 NG_SEND_DATA_ONLY(error, hook, m); 465 NG_OUTBOUND_THREAD_UNREF(); 466 NG_HOOK_UNREF(hook); 467 468 /* Update stats. */ 469 if (error == 0) { 470 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 471 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 472 } 473 474 return (error); 475 } 476 477 #ifdef DEBUG 478 /* 479 * Display an ioctl to the virtual interface 480 */ 481 482 static void 483 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 484 { 485 char *str; 486 487 switch (command & IOC_DIRMASK) { 488 case IOC_VOID: 489 str = "IO"; 490 break; 491 case IOC_OUT: 492 str = "IOR"; 493 break; 494 case IOC_IN: 495 str = "IOW"; 496 break; 497 case IOC_INOUT: 498 str = "IORW"; 499 break; 500 default: 501 str = "IO??"; 502 } 503 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 504 ifp->if_xname, 505 str, 506 IOCGROUP(command), 507 command & 0xff, 508 IOCPARM_LEN(command)); 509 } 510 #endif /* DEBUG */ 511 512 /************************************************************************ 513 NETGRAPH NODE STUFF 514 ************************************************************************/ 515 516 /* 517 * Constructor for a node 518 */ 519 static int 520 ng_iface_constructor(node_p node) 521 { 522 struct ifnet *ifp; 523 priv_p priv; 524 525 /* Allocate node and interface private structures */ 526 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 527 ifp = if_alloc(IFT_PROPVIRTUAL); 528 if (ifp == NULL) { 529 free(priv, M_NETGRAPH_IFACE); 530 return (ENOMEM); 531 } 532 533 rm_init(&priv->lock, "ng_iface private rmlock"); 534 535 /* Link them together */ 536 ifp->if_softc = priv; 537 priv->ifp = ifp; 538 539 /* Get an interface unit number */ 540 priv->unit = alloc_unr(V_ng_iface_unit); 541 542 /* Link together node and private info */ 543 NG_NODE_SET_PRIVATE(node, priv); 544 priv->node = node; 545 546 /* Initialize interface structure */ 547 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 548 ifp->if_output = ng_iface_output; 549 ifp->if_start = ng_iface_start; 550 ifp->if_ioctl = ng_iface_ioctl; 551 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 552 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 553 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 554 ifp->if_addrlen = 0; /* XXX */ 555 ifp->if_hdrlen = 0; /* XXX */ 556 ifp->if_baudrate = 64000; /* XXX */ 557 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 558 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 559 IFQ_SET_READY(&ifp->if_snd); 560 561 /* Give this node the same name as the interface (if possible) */ 562 if (ng_name_node(node, ifp->if_xname) != 0) 563 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 564 ifp->if_xname); 565 566 /* Attach the interface */ 567 if_attach(ifp); 568 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 569 570 /* Done */ 571 return (0); 572 } 573 574 /* 575 * Give our ok for a hook to be added 576 */ 577 static int 578 ng_iface_newhook(node_p node, hook_p hook, const char *name) 579 { 580 const iffam_p iffam = get_iffam_from_name(name); 581 const priv_p priv = NG_NODE_PRIVATE(node); 582 hook_p *hookptr; 583 584 if (iffam == NULL) 585 return (EPFNOSUPPORT); 586 PRIV_WLOCK(priv); 587 hookptr = get_hook_from_iffam(priv, iffam); 588 if (*hookptr != NULL) { 589 PRIV_WUNLOCK(priv); 590 return (EISCONN); 591 } 592 *hookptr = hook; 593 NG_HOOK_HI_STACK(hook); 594 NG_HOOK_SET_TO_INBOUND(hook); 595 PRIV_WUNLOCK(priv); 596 return (0); 597 } 598 599 /* 600 * Receive a control message 601 */ 602 static int 603 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 604 { 605 const priv_p priv = NG_NODE_PRIVATE(node); 606 struct ifnet *const ifp = priv->ifp; 607 struct ng_mesg *resp = NULL; 608 int error = 0; 609 struct ng_mesg *msg; 610 611 NGI_GET_MSG(item, msg); 612 switch (msg->header.typecookie) { 613 case NGM_IFACE_COOKIE: 614 switch (msg->header.cmd) { 615 case NGM_IFACE_GET_IFNAME: 616 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 617 if (resp == NULL) { 618 error = ENOMEM; 619 break; 620 } 621 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 622 break; 623 624 case NGM_IFACE_POINT2POINT: 625 case NGM_IFACE_BROADCAST: 626 { 627 /* Deny request if interface is UP */ 628 if ((ifp->if_flags & IFF_UP) != 0) 629 return (EBUSY); 630 631 /* Change flags */ 632 switch (msg->header.cmd) { 633 case NGM_IFACE_POINT2POINT: 634 ifp->if_flags |= IFF_POINTOPOINT; 635 ifp->if_flags &= ~IFF_BROADCAST; 636 break; 637 case NGM_IFACE_BROADCAST: 638 ifp->if_flags &= ~IFF_POINTOPOINT; 639 ifp->if_flags |= IFF_BROADCAST; 640 break; 641 } 642 break; 643 } 644 645 case NGM_IFACE_GET_IFINDEX: 646 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 647 if (resp == NULL) { 648 error = ENOMEM; 649 break; 650 } 651 *((uint32_t *)resp->data) = priv->ifp->if_index; 652 break; 653 654 default: 655 error = EINVAL; 656 break; 657 } 658 break; 659 case NGM_FLOW_COOKIE: 660 switch (msg->header.cmd) { 661 case NGM_LINK_IS_UP: 662 if_link_state_change(ifp, LINK_STATE_UP); 663 break; 664 case NGM_LINK_IS_DOWN: 665 if_link_state_change(ifp, LINK_STATE_DOWN); 666 break; 667 default: 668 break; 669 } 670 break; 671 default: 672 error = EINVAL; 673 break; 674 } 675 NG_RESPOND_MSG(error, node, item, resp); 676 NG_FREE_MSG(msg); 677 return (error); 678 } 679 680 /* 681 * Recive data from a hook. Pass the packet to the correct input routine. 682 */ 683 static int 684 ng_iface_rcvdata(hook_p hook, item_p item) 685 { 686 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 687 const iffam_p iffam = get_iffam_from_hook(priv, hook); 688 struct ifnet *const ifp = priv->ifp; 689 struct epoch_tracker et; 690 struct mbuf *m; 691 int isr; 692 693 NGI_GET_M(item, m); 694 NG_FREE_ITEM(item); 695 /* Sanity checks */ 696 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 697 M_ASSERTPKTHDR(m); 698 if ((ifp->if_flags & IFF_UP) == 0) { 699 NG_FREE_M(m); 700 return (ENETDOWN); 701 } 702 703 /* Update interface stats */ 704 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 705 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 706 707 /* Note receiving interface */ 708 m->m_pkthdr.rcvif = ifp; 709 710 /* Berkeley packet filter */ 711 ng_iface_bpftap(ifp, m, iffam->family); 712 713 /* Send packet */ 714 switch (iffam->family) { 715 #ifdef INET 716 case AF_INET: 717 isr = NETISR_IP; 718 break; 719 #endif 720 #ifdef INET6 721 case AF_INET6: 722 isr = NETISR_IPV6; 723 break; 724 #endif 725 default: 726 m_freem(m); 727 return (EAFNOSUPPORT); 728 } 729 random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG); 730 M_SETFIB(m, ifp->if_fib); 731 CURVNET_SET(ifp->if_vnet); 732 NET_EPOCH_ENTER(et); 733 netisr_dispatch(isr, m); 734 NET_EPOCH_EXIT(et); 735 CURVNET_RESTORE(); 736 return (0); 737 } 738 739 /* 740 * Shutdown and remove the node and its associated interface. 741 */ 742 static int 743 ng_iface_shutdown(node_p node) 744 { 745 const priv_p priv = NG_NODE_PRIVATE(node); 746 747 /* 748 * The ifnet may be in a different vnet than the netgraph node, 749 * hence we have to change the current vnet context here. 750 */ 751 CURVNET_SET_QUIET(priv->ifp->if_vnet); 752 bpfdetach(priv->ifp); 753 if_detach(priv->ifp); 754 if_free(priv->ifp); 755 CURVNET_RESTORE(); 756 priv->ifp = NULL; 757 free_unr(V_ng_iface_unit, priv->unit); 758 rm_destroy(&priv->lock); 759 free(priv, M_NETGRAPH_IFACE); 760 NG_NODE_SET_PRIVATE(node, NULL); 761 NG_NODE_UNREF(node); 762 return (0); 763 } 764 765 /* 766 * Hook disconnection. Note that we do *not* shutdown when all 767 * hooks have been disconnected. 768 */ 769 static int 770 ng_iface_disconnect(hook_p hook) 771 { 772 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 773 const iffam_p iffam = get_iffam_from_hook(priv, hook); 774 775 if (iffam == NULL) 776 panic("%s", __func__); 777 PRIV_WLOCK(priv); 778 *get_hook_from_iffam(priv, iffam) = NULL; 779 PRIV_WUNLOCK(priv); 780 return (0); 781 } 782 783 /* 784 * Handle loading and unloading for this node type. 785 */ 786 static int 787 ng_iface_mod_event(module_t mod, int event, void *data) 788 { 789 int error = 0; 790 791 switch (event) { 792 case MOD_LOAD: 793 case MOD_UNLOAD: 794 break; 795 default: 796 error = EOPNOTSUPP; 797 break; 798 } 799 return (error); 800 } 801 802 static void 803 vnet_ng_iface_init(const void *unused) 804 { 805 806 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 807 } 808 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 809 vnet_ng_iface_init, NULL); 810 811 static void 812 vnet_ng_iface_uninit(const void *unused) 813 { 814 815 delete_unrhdr(V_ng_iface_unit); 816 } 817 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, 818 vnet_ng_iface_uninit, NULL);
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