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/syslog.h> 72 #include <sys/libkern.h> 73 74 #include <net/if.h> 75 #include <net/if_var.h> 76 #include <net/if_types.h> 77 #include <net/bpf.h> 78 #include <net/netisr.h> 79 #include <net/route.h> 80 #include <net/vnet.h> 81 82 #include <netinet/in.h> 83 84 #include <netgraph/ng_message.h> 85 #include <netgraph/netgraph.h> 86 #include <netgraph/ng_parse.h> 87 #include <netgraph/ng_iface.h> 88 89 #ifdef NG_SEPARATE_MALLOC 90 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node"); 91 #else 92 #define M_NETGRAPH_IFACE M_NETGRAPH 93 #endif 94 95 /* This struct describes one address family */ 96 struct iffam { 97 sa_family_t family; /* Address family */ 98 const char *hookname; /* Name for hook */ 99 }; 100 typedef const struct iffam *iffam_p; 101 102 /* List of address families supported by our interface */ 103 const static struct iffam gFamilies[] = { 104 { AF_INET, NG_IFACE_HOOK_INET }, 105 { AF_INET6, NG_IFACE_HOOK_INET6 }, 106 { AF_ATM, NG_IFACE_HOOK_ATM }, 107 { AF_NATM, NG_IFACE_HOOK_NATM }, 108 }; 109 #define NUM_FAMILIES nitems(gFamilies) 110 111 /* Node private data */ 112 struct ng_iface_private { 113 struct ifnet *ifp; /* Our interface */ 114 int unit; /* Interface unit number */ 115 node_p node; /* Our netgraph node */ 116 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 117 struct rmlock lock; /* Protect private data changes */ 118 }; 119 typedef struct ng_iface_private *priv_p; 120 121 #define PRIV_RLOCK(priv, t) rm_rlock(&priv->lock, t) 122 #define PRIV_RUNLOCK(priv, t) rm_runlock(&priv->lock, t) 123 #define PRIV_WLOCK(priv) rm_wlock(&priv->lock) 124 #define PRIV_WUNLOCK(priv) rm_wunlock(&priv->lock) 125 126 /* Interface methods */ 127 static void ng_iface_start(struct ifnet *ifp); 128 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 129 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 130 const struct sockaddr *dst, struct route *ro); 131 static void ng_iface_bpftap(struct ifnet *ifp, 132 struct mbuf *m, sa_family_t family); 133 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 134 sa_family_t sa); 135 #ifdef DEBUG 136 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 137 #endif 138 139 /* Netgraph methods */ 140 static int ng_iface_mod_event(module_t, int, void *); 141 static ng_constructor_t ng_iface_constructor; 142 static ng_rcvmsg_t ng_iface_rcvmsg; 143 static ng_shutdown_t ng_iface_shutdown; 144 static ng_newhook_t ng_iface_newhook; 145 static ng_rcvdata_t ng_iface_rcvdata; 146 static ng_disconnect_t ng_iface_disconnect; 147 148 /* Helper stuff */ 149 static iffam_p get_iffam_from_af(sa_family_t family); 150 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 151 static iffam_p get_iffam_from_name(const char *name); 152 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 153 154 /* List of commands and how to convert arguments to/from ASCII */ 155 static const struct ng_cmdlist ng_iface_cmds[] = { 156 { 157 NGM_IFACE_COOKIE, 158 NGM_IFACE_GET_IFNAME, 159 "getifname", 160 NULL, 161 &ng_parse_string_type 162 }, 163 { 164 NGM_IFACE_COOKIE, 165 NGM_IFACE_POINT2POINT, 166 "point2point", 167 NULL, 168 NULL 169 }, 170 { 171 NGM_IFACE_COOKIE, 172 NGM_IFACE_BROADCAST, 173 "broadcast", 174 NULL, 175 NULL 176 }, 177 { 178 NGM_IFACE_COOKIE, 179 NGM_IFACE_GET_IFINDEX, 180 "getifindex", 181 NULL, 182 &ng_parse_uint32_type 183 }, 184 { 0 } 185 }; 186 187 /* Node type descriptor */ 188 static struct ng_type typestruct = { 189 .version = NG_ABI_VERSION, 190 .name = NG_IFACE_NODE_TYPE, 191 .mod_event = ng_iface_mod_event, 192 .constructor = ng_iface_constructor, 193 .rcvmsg = ng_iface_rcvmsg, 194 .shutdown = ng_iface_shutdown, 195 .newhook = ng_iface_newhook, 196 .rcvdata = ng_iface_rcvdata, 197 .disconnect = ng_iface_disconnect, 198 .cmdlist = ng_iface_cmds, 199 }; 200 NETGRAPH_INIT(iface, &typestruct); 201 202 static VNET_DEFINE(struct unrhdr *, ng_iface_unit); 203 #define V_ng_iface_unit VNET(ng_iface_unit) 204 205 /************************************************************************ 206 HELPER STUFF 207 ************************************************************************/ 208 209 /* 210 * Get the family descriptor from the family ID 211 */ 212 static __inline iffam_p 213 get_iffam_from_af(sa_family_t family) 214 { 215 iffam_p iffam; 216 int k; 217 218 for (k = 0; k < NUM_FAMILIES; k++) { 219 iffam = &gFamilies[k]; 220 if (iffam->family == family) 221 return (iffam); 222 } 223 return (NULL); 224 } 225 226 /* 227 * Get the family descriptor from the hook 228 */ 229 static __inline iffam_p 230 get_iffam_from_hook(priv_p priv, hook_p hook) 231 { 232 int k; 233 234 for (k = 0; k < NUM_FAMILIES; k++) 235 if (priv->hooks[k] == hook) 236 return (&gFamilies[k]); 237 return (NULL); 238 } 239 240 /* 241 * Get the hook from the iffam descriptor 242 */ 243 244 static __inline hook_p * 245 get_hook_from_iffam(priv_p priv, iffam_p iffam) 246 { 247 return (&priv->hooks[iffam - gFamilies]); 248 } 249 250 /* 251 * Get the iffam descriptor from the name 252 */ 253 static __inline iffam_p 254 get_iffam_from_name(const char *name) 255 { 256 iffam_p iffam; 257 int k; 258 259 for (k = 0; k < NUM_FAMILIES; k++) { 260 iffam = &gFamilies[k]; 261 if (!strcmp(iffam->hookname, name)) 262 return (iffam); 263 } 264 return (NULL); 265 } 266 267 /************************************************************************ 268 INTERFACE STUFF 269 ************************************************************************/ 270 271 /* 272 * Process an ioctl for the virtual interface 273 */ 274 static int 275 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 276 { 277 struct ifreq *const ifr = (struct ifreq *) data; 278 int error = 0; 279 280 #ifdef DEBUG 281 ng_iface_print_ioctl(ifp, command, data); 282 #endif 283 switch (command) { 284 285 /* These two are mostly handled at a higher layer */ 286 case SIOCSIFADDR: 287 ifp->if_flags |= IFF_UP; 288 ifp->if_drv_flags |= IFF_DRV_RUNNING; 289 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 290 break; 291 case SIOCGIFADDR: 292 break; 293 294 /* Set flags */ 295 case SIOCSIFFLAGS: 296 /* 297 * If the interface is marked up and stopped, then start it. 298 * If it is marked down and running, then stop it. 299 */ 300 if (ifr->ifr_flags & IFF_UP) { 301 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 302 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 303 ifp->if_drv_flags |= IFF_DRV_RUNNING; 304 } 305 } else { 306 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 307 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 308 IFF_DRV_OACTIVE); 309 } 310 break; 311 312 /* Set the interface MTU */ 313 case SIOCSIFMTU: 314 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 315 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 316 error = EINVAL; 317 else 318 ifp->if_mtu = ifr->ifr_mtu; 319 break; 320 321 /* Stuff that's not supported */ 322 case SIOCADDMULTI: 323 case SIOCDELMULTI: 324 error = 0; 325 break; 326 case SIOCSIFPHYS: 327 error = EOPNOTSUPP; 328 break; 329 330 default: 331 error = EINVAL; 332 break; 333 } 334 return (error); 335 } 336 337 /* 338 * This routine is called to deliver a packet out the interface. 339 * We simply look at the address family and relay the packet to 340 * the corresponding hook, if it exists and is connected. 341 */ 342 343 static int 344 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 345 const struct sockaddr *dst, struct route *ro) 346 { 347 struct m_tag *mtag; 348 uint32_t af; 349 int error; 350 351 /* Check interface flags */ 352 if (!((ifp->if_flags & IFF_UP) && 353 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 354 m_freem(m); 355 return (ENETDOWN); 356 } 357 358 /* Protect from deadly infinite recursion. */ 359 mtag = NULL; 360 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 361 if (*(struct ifnet **)(mtag + 1) == ifp) { 362 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 363 m_freem(m); 364 return (EDEADLK); 365 } 366 } 367 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 368 M_NOWAIT); 369 if (mtag == NULL) { 370 m_freem(m); 371 return (ENOMEM); 372 } 373 *(struct ifnet **)(mtag + 1) = ifp; 374 m_tag_prepend(m, mtag); 375 376 /* BPF writes need to be handled specially. */ 377 if (dst->sa_family == AF_UNSPEC) 378 bcopy(dst->sa_data, &af, sizeof(af)); 379 else 380 af = dst->sa_family; 381 382 /* Berkeley packet filter */ 383 ng_iface_bpftap(ifp, m, af); 384 385 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 386 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 387 if (m == NULL) { 388 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 389 return (ENOBUFS); 390 } 391 *(sa_family_t *)m->m_data = af; 392 error = (ifp->if_transmit)(ifp, m); 393 } else 394 error = ng_iface_send(ifp, m, af); 395 396 return (error); 397 } 398 399 /* 400 * Start method is used only when ALTQ is enabled. 401 */ 402 static void 403 ng_iface_start(struct ifnet *ifp) 404 { 405 struct mbuf *m; 406 sa_family_t sa; 407 408 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 409 410 for(;;) { 411 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 412 if (m == NULL) 413 break; 414 sa = *mtod(m, sa_family_t *); 415 m_adj(m, sizeof(sa_family_t)); 416 ng_iface_send(ifp, m, sa); 417 } 418 } 419 420 /* 421 * Flash a packet by the BPF (requires prepending 4 byte AF header) 422 * Note the phoney mbuf; this is OK because BPF treats it read-only. 423 */ 424 static void 425 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 426 { 427 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 428 if (bpf_peers_present(ifp->if_bpf)) { 429 int32_t family4 = (int32_t)family; 430 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 431 } 432 } 433 434 /* 435 * This routine does actual delivery of the packet into the 436 * netgraph(4). It is called from ng_iface_start() and 437 * ng_iface_output(). 438 */ 439 static int 440 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 441 { 442 struct rm_priotracker priv_tracker; 443 const priv_p priv = (priv_p) ifp->if_softc; 444 const iffam_p iffam = get_iffam_from_af(sa); 445 hook_p hook; 446 int error; 447 int len; 448 449 /* Check address family to determine hook (if known) */ 450 if (iffam == NULL) { 451 m_freem(m); 452 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 453 return (EAFNOSUPPORT); 454 } 455 456 /* Copy length before the mbuf gets invalidated. */ 457 len = m->m_pkthdr.len; 458 459 PRIV_RLOCK(priv, &priv_tracker); 460 hook = *get_hook_from_iffam(priv, iffam); 461 if (hook == NULL) { 462 NG_FREE_M(m); 463 PRIV_RUNLOCK(priv, &priv_tracker); 464 return ENETDOWN; 465 } 466 NG_HOOK_REF(hook); 467 PRIV_RUNLOCK(priv, &priv_tracker); 468 469 NG_OUTBOUND_THREAD_REF(); 470 NG_SEND_DATA_ONLY(error, hook, m); 471 NG_OUTBOUND_THREAD_UNREF(); 472 NG_HOOK_UNREF(hook); 473 474 /* Update stats. */ 475 if (error == 0) { 476 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 477 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 478 } 479 480 return (error); 481 } 482 483 #ifdef DEBUG 484 /* 485 * Display an ioctl to the virtual interface 486 */ 487 488 static void 489 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 490 { 491 char *str; 492 493 switch (command & IOC_DIRMASK) { 494 case IOC_VOID: 495 str = "IO"; 496 break; 497 case IOC_OUT: 498 str = "IOR"; 499 break; 500 case IOC_IN: 501 str = "IOW"; 502 break; 503 case IOC_INOUT: 504 str = "IORW"; 505 break; 506 default: 507 str = "IO??"; 508 } 509 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 510 ifp->if_xname, 511 str, 512 IOCGROUP(command), 513 command & 0xff, 514 IOCPARM_LEN(command)); 515 } 516 #endif /* DEBUG */ 517 518 /************************************************************************ 519 NETGRAPH NODE STUFF 520 ************************************************************************/ 521 522 /* 523 * Constructor for a node 524 */ 525 static int 526 ng_iface_constructor(node_p node) 527 { 528 struct ifnet *ifp; 529 priv_p priv; 530 531 /* Allocate node and interface private structures */ 532 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 533 ifp = if_alloc(IFT_PROPVIRTUAL); 534 if (ifp == NULL) { 535 free(priv, M_NETGRAPH_IFACE); 536 return (ENOMEM); 537 } 538 539 rm_init(&priv->lock, "ng_iface private rmlock"); 540 541 /* Link them together */ 542 ifp->if_softc = priv; 543 priv->ifp = ifp; 544 545 /* Get an interface unit number */ 546 priv->unit = alloc_unr(V_ng_iface_unit); 547 548 /* Link together node and private info */ 549 NG_NODE_SET_PRIVATE(node, priv); 550 priv->node = node; 551 552 /* Initialize interface structure */ 553 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 554 ifp->if_output = ng_iface_output; 555 ifp->if_start = ng_iface_start; 556 ifp->if_ioctl = ng_iface_ioctl; 557 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 558 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 559 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 560 ifp->if_addrlen = 0; /* XXX */ 561 ifp->if_hdrlen = 0; /* XXX */ 562 ifp->if_baudrate = 64000; /* XXX */ 563 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 564 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 565 IFQ_SET_READY(&ifp->if_snd); 566 567 /* Give this node the same name as the interface (if possible) */ 568 if (ng_name_node(node, ifp->if_xname) != 0) 569 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 570 ifp->if_xname); 571 572 /* Attach the interface */ 573 if_attach(ifp); 574 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 575 576 /* Done */ 577 return (0); 578 } 579 580 /* 581 * Give our ok for a hook to be added 582 */ 583 static int 584 ng_iface_newhook(node_p node, hook_p hook, const char *name) 585 { 586 const iffam_p iffam = get_iffam_from_name(name); 587 const priv_p priv = NG_NODE_PRIVATE(node); 588 hook_p *hookptr; 589 590 if (iffam == NULL) 591 return (EPFNOSUPPORT); 592 PRIV_WLOCK(priv); 593 hookptr = get_hook_from_iffam(priv, iffam); 594 if (*hookptr != NULL) { 595 PRIV_WUNLOCK(priv); 596 return (EISCONN); 597 } 598 *hookptr = hook; 599 NG_HOOK_HI_STACK(hook); 600 NG_HOOK_SET_TO_INBOUND(hook); 601 PRIV_WUNLOCK(priv); 602 return (0); 603 } 604 605 /* 606 * Receive a control message 607 */ 608 static int 609 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 610 { 611 const priv_p priv = NG_NODE_PRIVATE(node); 612 struct ifnet *const ifp = priv->ifp; 613 struct ng_mesg *resp = NULL; 614 int error = 0; 615 struct ng_mesg *msg; 616 617 NGI_GET_MSG(item, msg); 618 switch (msg->header.typecookie) { 619 case NGM_IFACE_COOKIE: 620 switch (msg->header.cmd) { 621 case NGM_IFACE_GET_IFNAME: 622 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 623 if (resp == NULL) { 624 error = ENOMEM; 625 break; 626 } 627 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 628 break; 629 630 case NGM_IFACE_POINT2POINT: 631 case NGM_IFACE_BROADCAST: 632 { 633 634 /* Deny request if interface is UP */ 635 if ((ifp->if_flags & IFF_UP) != 0) 636 return (EBUSY); 637 638 /* Change flags */ 639 switch (msg->header.cmd) { 640 case NGM_IFACE_POINT2POINT: 641 ifp->if_flags |= IFF_POINTOPOINT; 642 ifp->if_flags &= ~IFF_BROADCAST; 643 break; 644 case NGM_IFACE_BROADCAST: 645 ifp->if_flags &= ~IFF_POINTOPOINT; 646 ifp->if_flags |= IFF_BROADCAST; 647 break; 648 } 649 break; 650 } 651 652 case NGM_IFACE_GET_IFINDEX: 653 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 654 if (resp == NULL) { 655 error = ENOMEM; 656 break; 657 } 658 *((uint32_t *)resp->data) = priv->ifp->if_index; 659 break; 660 661 default: 662 error = EINVAL; 663 break; 664 } 665 break; 666 case NGM_FLOW_COOKIE: 667 switch (msg->header.cmd) { 668 case NGM_LINK_IS_UP: 669 if_link_state_change(ifp, LINK_STATE_UP); 670 break; 671 case NGM_LINK_IS_DOWN: 672 if_link_state_change(ifp, LINK_STATE_DOWN); 673 break; 674 default: 675 break; 676 } 677 break; 678 default: 679 error = EINVAL; 680 break; 681 } 682 NG_RESPOND_MSG(error, node, item, resp); 683 NG_FREE_MSG(msg); 684 return (error); 685 } 686 687 /* 688 * Recive data from a hook. Pass the packet to the correct input routine. 689 */ 690 static int 691 ng_iface_rcvdata(hook_p hook, item_p item) 692 { 693 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 694 const iffam_p iffam = get_iffam_from_hook(priv, hook); 695 struct ifnet *const ifp = priv->ifp; 696 struct mbuf *m; 697 int isr; 698 699 NGI_GET_M(item, m); 700 NG_FREE_ITEM(item); 701 /* Sanity checks */ 702 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 703 M_ASSERTPKTHDR(m); 704 if ((ifp->if_flags & IFF_UP) == 0) { 705 NG_FREE_M(m); 706 return (ENETDOWN); 707 } 708 709 /* Update interface stats */ 710 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 711 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 712 713 /* Note receiving interface */ 714 m->m_pkthdr.rcvif = ifp; 715 716 /* Berkeley packet filter */ 717 ng_iface_bpftap(ifp, m, iffam->family); 718 719 /* Send packet */ 720 switch (iffam->family) { 721 #ifdef INET 722 case AF_INET: 723 isr = NETISR_IP; 724 break; 725 #endif 726 #ifdef INET6 727 case AF_INET6: 728 isr = NETISR_IPV6; 729 break; 730 #endif 731 default: 732 m_freem(m); 733 return (EAFNOSUPPORT); 734 } 735 random_harvest_queue(m, sizeof(*m), 2, RANDOM_NET_NG); 736 M_SETFIB(m, ifp->if_fib); 737 netisr_dispatch(isr, m); 738 return (0); 739 } 740 741 /* 742 * Shutdown and remove the node and its associated interface. 743 */ 744 static int 745 ng_iface_shutdown(node_p node) 746 { 747 const priv_p priv = NG_NODE_PRIVATE(node); 748 749 /* 750 * The ifnet may be in a different vnet than the netgraph node, 751 * hence we have to change the current vnet context here. 752 */ 753 CURVNET_SET_QUIET(priv->ifp->if_vnet); 754 bpfdetach(priv->ifp); 755 if_detach(priv->ifp); 756 if_free(priv->ifp); 757 CURVNET_RESTORE(); 758 priv->ifp = NULL; 759 free_unr(V_ng_iface_unit, priv->unit); 760 rm_destroy(&priv->lock); 761 free(priv, M_NETGRAPH_IFACE); 762 NG_NODE_SET_PRIVATE(node, NULL); 763 NG_NODE_UNREF(node); 764 return (0); 765 } 766 767 /* 768 * Hook disconnection. Note that we do *not* shutdown when all 769 * hooks have been disconnected. 770 */ 771 static int 772 ng_iface_disconnect(hook_p hook) 773 { 774 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 775 const iffam_p iffam = get_iffam_from_hook(priv, hook); 776 777 if (iffam == NULL) 778 panic("%s", __func__); 779 PRIV_WLOCK(priv); 780 *get_hook_from_iffam(priv, iffam) = NULL; 781 PRIV_WUNLOCK(priv); 782 return (0); 783 } 784 785 /* 786 * Handle loading and unloading for this node type. 787 */ 788 static int 789 ng_iface_mod_event(module_t mod, int event, void *data) 790 { 791 int error = 0; 792 793 switch (event) { 794 case MOD_LOAD: 795 case MOD_UNLOAD: 796 break; 797 default: 798 error = EOPNOTSUPP; 799 break; 800 } 801 return (error); 802 } 803 804 static void 805 vnet_ng_iface_init(const void *unused) 806 { 807 808 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 809 } 810 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 811 vnet_ng_iface_init, NULL); 812 813 static void 814 vnet_ng_iface_uninit(const void *unused) 815 { 816 817 delete_unrhdr(V_ng_iface_unit); 818 } 819 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, 820 vnet_ng_iface_uninit, NULL);
Cache object: fc4402c088be4f8ffca281bd1fe43d97
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