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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: releng/11.0/sys/netgraph/ng_iface.c 302054 2016-06-21 13:48:49Z bz $ 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/malloc.h> 63 #include <sys/mbuf.h> 64 #include <sys/errno.h> 65 #include <sys/proc.h> 66 #include <sys/random.h> 67 #include <sys/sockio.h> 68 #include <sys/socket.h> 69 #include <sys/syslog.h> 70 #include <sys/libkern.h> 71 72 #include <net/if.h> 73 #include <net/if_var.h> 74 #include <net/if_types.h> 75 #include <net/bpf.h> 76 #include <net/netisr.h> 77 #include <net/route.h> 78 #include <net/vnet.h> 79 80 #include <netinet/in.h> 81 82 #include <netgraph/ng_message.h> 83 #include <netgraph/netgraph.h> 84 #include <netgraph/ng_parse.h> 85 #include <netgraph/ng_iface.h> 86 87 #ifdef NG_SEPARATE_MALLOC 88 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node"); 89 #else 90 #define M_NETGRAPH_IFACE M_NETGRAPH 91 #endif 92 93 /* This struct describes one address family */ 94 struct iffam { 95 sa_family_t family; /* Address family */ 96 const char *hookname; /* Name for hook */ 97 }; 98 typedef const struct iffam *iffam_p; 99 100 /* List of address families supported by our interface */ 101 const static struct iffam gFamilies[] = { 102 { AF_INET, NG_IFACE_HOOK_INET }, 103 { AF_INET6, NG_IFACE_HOOK_INET6 }, 104 { AF_ATM, NG_IFACE_HOOK_ATM }, 105 { AF_NATM, NG_IFACE_HOOK_NATM }, 106 }; 107 #define NUM_FAMILIES nitems(gFamilies) 108 109 /* Node private data */ 110 struct ng_iface_private { 111 struct ifnet *ifp; /* Our interface */ 112 int unit; /* Interface unit number */ 113 node_p node; /* Our netgraph node */ 114 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 115 }; 116 typedef struct ng_iface_private *priv_p; 117 118 /* Interface methods */ 119 static void ng_iface_start(struct ifnet *ifp); 120 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 121 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 122 const struct sockaddr *dst, struct route *ro); 123 static void ng_iface_bpftap(struct ifnet *ifp, 124 struct mbuf *m, sa_family_t family); 125 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 126 sa_family_t sa); 127 #ifdef DEBUG 128 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 129 #endif 130 131 /* Netgraph methods */ 132 static int ng_iface_mod_event(module_t, int, void *); 133 static ng_constructor_t ng_iface_constructor; 134 static ng_rcvmsg_t ng_iface_rcvmsg; 135 static ng_shutdown_t ng_iface_shutdown; 136 static ng_newhook_t ng_iface_newhook; 137 static ng_rcvdata_t ng_iface_rcvdata; 138 static ng_disconnect_t ng_iface_disconnect; 139 140 /* Helper stuff */ 141 static iffam_p get_iffam_from_af(sa_family_t family); 142 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 143 static iffam_p get_iffam_from_name(const char *name); 144 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 145 146 /* List of commands and how to convert arguments to/from ASCII */ 147 static const struct ng_cmdlist ng_iface_cmds[] = { 148 { 149 NGM_IFACE_COOKIE, 150 NGM_IFACE_GET_IFNAME, 151 "getifname", 152 NULL, 153 &ng_parse_string_type 154 }, 155 { 156 NGM_IFACE_COOKIE, 157 NGM_IFACE_POINT2POINT, 158 "point2point", 159 NULL, 160 NULL 161 }, 162 { 163 NGM_IFACE_COOKIE, 164 NGM_IFACE_BROADCAST, 165 "broadcast", 166 NULL, 167 NULL 168 }, 169 { 170 NGM_IFACE_COOKIE, 171 NGM_IFACE_GET_IFINDEX, 172 "getifindex", 173 NULL, 174 &ng_parse_uint32_type 175 }, 176 { 0 } 177 }; 178 179 /* Node type descriptor */ 180 static struct ng_type typestruct = { 181 .version = NG_ABI_VERSION, 182 .name = NG_IFACE_NODE_TYPE, 183 .mod_event = ng_iface_mod_event, 184 .constructor = ng_iface_constructor, 185 .rcvmsg = ng_iface_rcvmsg, 186 .shutdown = ng_iface_shutdown, 187 .newhook = ng_iface_newhook, 188 .rcvdata = ng_iface_rcvdata, 189 .disconnect = ng_iface_disconnect, 190 .cmdlist = ng_iface_cmds, 191 }; 192 NETGRAPH_INIT(iface, &typestruct); 193 194 static VNET_DEFINE(struct unrhdr *, ng_iface_unit); 195 #define V_ng_iface_unit VNET(ng_iface_unit) 196 197 /************************************************************************ 198 HELPER STUFF 199 ************************************************************************/ 200 201 /* 202 * Get the family descriptor from the family ID 203 */ 204 static __inline iffam_p 205 get_iffam_from_af(sa_family_t family) 206 { 207 iffam_p iffam; 208 int k; 209 210 for (k = 0; k < NUM_FAMILIES; k++) { 211 iffam = &gFamilies[k]; 212 if (iffam->family == family) 213 return (iffam); 214 } 215 return (NULL); 216 } 217 218 /* 219 * Get the family descriptor from the hook 220 */ 221 static __inline iffam_p 222 get_iffam_from_hook(priv_p priv, hook_p hook) 223 { 224 int k; 225 226 for (k = 0; k < NUM_FAMILIES; k++) 227 if (priv->hooks[k] == hook) 228 return (&gFamilies[k]); 229 return (NULL); 230 } 231 232 /* 233 * Get the hook from the iffam descriptor 234 */ 235 236 static __inline hook_p * 237 get_hook_from_iffam(priv_p priv, iffam_p iffam) 238 { 239 return (&priv->hooks[iffam - gFamilies]); 240 } 241 242 /* 243 * Get the iffam descriptor from the name 244 */ 245 static __inline iffam_p 246 get_iffam_from_name(const char *name) 247 { 248 iffam_p iffam; 249 int k; 250 251 for (k = 0; k < NUM_FAMILIES; k++) { 252 iffam = &gFamilies[k]; 253 if (!strcmp(iffam->hookname, name)) 254 return (iffam); 255 } 256 return (NULL); 257 } 258 259 /************************************************************************ 260 INTERFACE STUFF 261 ************************************************************************/ 262 263 /* 264 * Process an ioctl for the virtual interface 265 */ 266 static int 267 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 268 { 269 struct ifreq *const ifr = (struct ifreq *) data; 270 int error = 0; 271 272 #ifdef DEBUG 273 ng_iface_print_ioctl(ifp, command, data); 274 #endif 275 switch (command) { 276 277 /* These two are mostly handled at a higher layer */ 278 case SIOCSIFADDR: 279 ifp->if_flags |= IFF_UP; 280 ifp->if_drv_flags |= IFF_DRV_RUNNING; 281 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 282 break; 283 case SIOCGIFADDR: 284 break; 285 286 /* Set flags */ 287 case SIOCSIFFLAGS: 288 /* 289 * If the interface is marked up and stopped, then start it. 290 * If it is marked down and running, then stop it. 291 */ 292 if (ifr->ifr_flags & IFF_UP) { 293 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 294 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 295 ifp->if_drv_flags |= IFF_DRV_RUNNING; 296 } 297 } else { 298 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 299 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 300 IFF_DRV_OACTIVE); 301 } 302 break; 303 304 /* Set the interface MTU */ 305 case SIOCSIFMTU: 306 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 307 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 308 error = EINVAL; 309 else 310 ifp->if_mtu = ifr->ifr_mtu; 311 break; 312 313 /* Stuff that's not supported */ 314 case SIOCADDMULTI: 315 case SIOCDELMULTI: 316 error = 0; 317 break; 318 case SIOCSIFPHYS: 319 error = EOPNOTSUPP; 320 break; 321 322 default: 323 error = EINVAL; 324 break; 325 } 326 return (error); 327 } 328 329 /* 330 * This routine is called to deliver a packet out the interface. 331 * We simply look at the address family and relay the packet to 332 * the corresponding hook, if it exists and is connected. 333 */ 334 335 static int 336 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 337 const struct sockaddr *dst, struct route *ro) 338 { 339 struct m_tag *mtag; 340 uint32_t af; 341 int error; 342 343 /* Check interface flags */ 344 if (!((ifp->if_flags & IFF_UP) && 345 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 346 m_freem(m); 347 return (ENETDOWN); 348 } 349 350 /* Protect from deadly infinite recursion. */ 351 mtag = NULL; 352 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 353 if (*(struct ifnet **)(mtag + 1) == ifp) { 354 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 355 m_freem(m); 356 return (EDEADLK); 357 } 358 } 359 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 360 M_NOWAIT); 361 if (mtag == NULL) { 362 m_freem(m); 363 return (ENOMEM); 364 } 365 *(struct ifnet **)(mtag + 1) = ifp; 366 m_tag_prepend(m, mtag); 367 368 /* BPF writes need to be handled specially. */ 369 if (dst->sa_family == AF_UNSPEC) 370 bcopy(dst->sa_data, &af, sizeof(af)); 371 else 372 af = dst->sa_family; 373 374 /* Berkeley packet filter */ 375 ng_iface_bpftap(ifp, m, af); 376 377 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 378 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 379 if (m == NULL) { 380 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 381 return (ENOBUFS); 382 } 383 *(sa_family_t *)m->m_data = af; 384 error = (ifp->if_transmit)(ifp, m); 385 } else 386 error = ng_iface_send(ifp, m, af); 387 388 return (error); 389 } 390 391 /* 392 * Start method is used only when ALTQ is enabled. 393 */ 394 static void 395 ng_iface_start(struct ifnet *ifp) 396 { 397 struct mbuf *m; 398 sa_family_t sa; 399 400 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 401 402 for(;;) { 403 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 404 if (m == NULL) 405 break; 406 sa = *mtod(m, sa_family_t *); 407 m_adj(m, sizeof(sa_family_t)); 408 ng_iface_send(ifp, m, sa); 409 } 410 } 411 412 /* 413 * Flash a packet by the BPF (requires prepending 4 byte AF header) 414 * Note the phoney mbuf; this is OK because BPF treats it read-only. 415 */ 416 static void 417 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 418 { 419 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 420 if (bpf_peers_present(ifp->if_bpf)) { 421 int32_t family4 = (int32_t)family; 422 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 423 } 424 } 425 426 /* 427 * This routine does actual delivery of the packet into the 428 * netgraph(4). It is called from ng_iface_start() and 429 * ng_iface_output(). 430 */ 431 static int 432 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 433 { 434 const priv_p priv = (priv_p) ifp->if_softc; 435 const iffam_p iffam = get_iffam_from_af(sa); 436 int error; 437 int len; 438 439 /* Check address family to determine hook (if known) */ 440 if (iffam == NULL) { 441 m_freem(m); 442 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 443 return (EAFNOSUPPORT); 444 } 445 446 /* Copy length before the mbuf gets invalidated. */ 447 len = m->m_pkthdr.len; 448 449 /* Send packet. If hook is not connected, mbuf will get freed. */ 450 NG_OUTBOUND_THREAD_REF(); 451 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 452 NG_OUTBOUND_THREAD_UNREF(); 453 454 /* Update stats. */ 455 if (error == 0) { 456 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 457 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 458 } 459 460 return (error); 461 } 462 463 #ifdef DEBUG 464 /* 465 * Display an ioctl to the virtual interface 466 */ 467 468 static void 469 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 470 { 471 char *str; 472 473 switch (command & IOC_DIRMASK) { 474 case IOC_VOID: 475 str = "IO"; 476 break; 477 case IOC_OUT: 478 str = "IOR"; 479 break; 480 case IOC_IN: 481 str = "IOW"; 482 break; 483 case IOC_INOUT: 484 str = "IORW"; 485 break; 486 default: 487 str = "IO??"; 488 } 489 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 490 ifp->if_xname, 491 str, 492 IOCGROUP(command), 493 command & 0xff, 494 IOCPARM_LEN(command)); 495 } 496 #endif /* DEBUG */ 497 498 /************************************************************************ 499 NETGRAPH NODE STUFF 500 ************************************************************************/ 501 502 /* 503 * Constructor for a node 504 */ 505 static int 506 ng_iface_constructor(node_p node) 507 { 508 struct ifnet *ifp; 509 priv_p priv; 510 511 /* Allocate node and interface private structures */ 512 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 513 ifp = if_alloc(IFT_PROPVIRTUAL); 514 if (ifp == NULL) { 515 free(priv, M_NETGRAPH_IFACE); 516 return (ENOMEM); 517 } 518 519 /* Link them together */ 520 ifp->if_softc = priv; 521 priv->ifp = ifp; 522 523 /* Get an interface unit number */ 524 priv->unit = alloc_unr(V_ng_iface_unit); 525 526 /* Link together node and private info */ 527 NG_NODE_SET_PRIVATE(node, priv); 528 priv->node = node; 529 530 /* Initialize interface structure */ 531 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 532 ifp->if_output = ng_iface_output; 533 ifp->if_start = ng_iface_start; 534 ifp->if_ioctl = ng_iface_ioctl; 535 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 536 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 537 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 538 ifp->if_addrlen = 0; /* XXX */ 539 ifp->if_hdrlen = 0; /* XXX */ 540 ifp->if_baudrate = 64000; /* XXX */ 541 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 542 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 543 IFQ_SET_READY(&ifp->if_snd); 544 545 /* Give this node the same name as the interface (if possible) */ 546 if (ng_name_node(node, ifp->if_xname) != 0) 547 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 548 ifp->if_xname); 549 550 /* Attach the interface */ 551 if_attach(ifp); 552 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 553 554 /* Done */ 555 return (0); 556 } 557 558 /* 559 * Give our ok for a hook to be added 560 */ 561 static int 562 ng_iface_newhook(node_p node, hook_p hook, const char *name) 563 { 564 const iffam_p iffam = get_iffam_from_name(name); 565 hook_p *hookptr; 566 567 if (iffam == NULL) 568 return (EPFNOSUPPORT); 569 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 570 if (*hookptr != NULL) 571 return (EISCONN); 572 *hookptr = hook; 573 NG_HOOK_HI_STACK(hook); 574 NG_HOOK_SET_TO_INBOUND(hook); 575 return (0); 576 } 577 578 /* 579 * Receive a control message 580 */ 581 static int 582 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 583 { 584 const priv_p priv = NG_NODE_PRIVATE(node); 585 struct ifnet *const ifp = priv->ifp; 586 struct ng_mesg *resp = NULL; 587 int error = 0; 588 struct ng_mesg *msg; 589 590 NGI_GET_MSG(item, msg); 591 switch (msg->header.typecookie) { 592 case NGM_IFACE_COOKIE: 593 switch (msg->header.cmd) { 594 case NGM_IFACE_GET_IFNAME: 595 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 596 if (resp == NULL) { 597 error = ENOMEM; 598 break; 599 } 600 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 601 break; 602 603 case NGM_IFACE_POINT2POINT: 604 case NGM_IFACE_BROADCAST: 605 { 606 607 /* Deny request if interface is UP */ 608 if ((ifp->if_flags & IFF_UP) != 0) 609 return (EBUSY); 610 611 /* Change flags */ 612 switch (msg->header.cmd) { 613 case NGM_IFACE_POINT2POINT: 614 ifp->if_flags |= IFF_POINTOPOINT; 615 ifp->if_flags &= ~IFF_BROADCAST; 616 break; 617 case NGM_IFACE_BROADCAST: 618 ifp->if_flags &= ~IFF_POINTOPOINT; 619 ifp->if_flags |= IFF_BROADCAST; 620 break; 621 } 622 break; 623 } 624 625 case NGM_IFACE_GET_IFINDEX: 626 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 627 if (resp == NULL) { 628 error = ENOMEM; 629 break; 630 } 631 *((uint32_t *)resp->data) = priv->ifp->if_index; 632 break; 633 634 default: 635 error = EINVAL; 636 break; 637 } 638 break; 639 case NGM_FLOW_COOKIE: 640 switch (msg->header.cmd) { 641 case NGM_LINK_IS_UP: 642 if_link_state_change(ifp, LINK_STATE_UP); 643 break; 644 case NGM_LINK_IS_DOWN: 645 if_link_state_change(ifp, LINK_STATE_DOWN); 646 break; 647 default: 648 break; 649 } 650 break; 651 default: 652 error = EINVAL; 653 break; 654 } 655 NG_RESPOND_MSG(error, node, item, resp); 656 NG_FREE_MSG(msg); 657 return (error); 658 } 659 660 /* 661 * Recive data from a hook. Pass the packet to the correct input routine. 662 */ 663 static int 664 ng_iface_rcvdata(hook_p hook, item_p item) 665 { 666 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 667 const iffam_p iffam = get_iffam_from_hook(priv, hook); 668 struct ifnet *const ifp = priv->ifp; 669 struct mbuf *m; 670 int isr; 671 672 NGI_GET_M(item, m); 673 NG_FREE_ITEM(item); 674 /* Sanity checks */ 675 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 676 M_ASSERTPKTHDR(m); 677 if ((ifp->if_flags & IFF_UP) == 0) { 678 NG_FREE_M(m); 679 return (ENETDOWN); 680 } 681 682 /* Update interface stats */ 683 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 684 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 685 686 /* Note receiving interface */ 687 m->m_pkthdr.rcvif = ifp; 688 689 /* Berkeley packet filter */ 690 ng_iface_bpftap(ifp, m, iffam->family); 691 692 /* Send packet */ 693 switch (iffam->family) { 694 #ifdef INET 695 case AF_INET: 696 isr = NETISR_IP; 697 break; 698 #endif 699 #ifdef INET6 700 case AF_INET6: 701 isr = NETISR_IPV6; 702 break; 703 #endif 704 default: 705 m_freem(m); 706 return (EAFNOSUPPORT); 707 } 708 random_harvest_queue(m, sizeof(*m), 2, RANDOM_NET_NG); 709 M_SETFIB(m, ifp->if_fib); 710 netisr_dispatch(isr, m); 711 return (0); 712 } 713 714 /* 715 * Shutdown and remove the node and its associated interface. 716 */ 717 static int 718 ng_iface_shutdown(node_p node) 719 { 720 const priv_p priv = NG_NODE_PRIVATE(node); 721 722 /* 723 * The ifnet may be in a different vnet than the netgraph node, 724 * hence we have to change the current vnet context here. 725 */ 726 CURVNET_SET_QUIET(priv->ifp->if_vnet); 727 bpfdetach(priv->ifp); 728 if_detach(priv->ifp); 729 if_free(priv->ifp); 730 CURVNET_RESTORE(); 731 priv->ifp = NULL; 732 free_unr(V_ng_iface_unit, priv->unit); 733 free(priv, M_NETGRAPH_IFACE); 734 NG_NODE_SET_PRIVATE(node, NULL); 735 NG_NODE_UNREF(node); 736 return (0); 737 } 738 739 /* 740 * Hook disconnection. Note that we do *not* shutdown when all 741 * hooks have been disconnected. 742 */ 743 static int 744 ng_iface_disconnect(hook_p hook) 745 { 746 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 747 const iffam_p iffam = get_iffam_from_hook(priv, hook); 748 749 if (iffam == NULL) 750 panic("%s", __func__); 751 *get_hook_from_iffam(priv, iffam) = NULL; 752 return (0); 753 } 754 755 /* 756 * Handle loading and unloading for this node type. 757 */ 758 static int 759 ng_iface_mod_event(module_t mod, int event, void *data) 760 { 761 int error = 0; 762 763 switch (event) { 764 case MOD_LOAD: 765 case MOD_UNLOAD: 766 break; 767 default: 768 error = EOPNOTSUPP; 769 break; 770 } 771 return (error); 772 } 773 774 static void 775 vnet_ng_iface_init(const void *unused) 776 { 777 778 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 779 } 780 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 781 vnet_ng_iface_init, NULL); 782 783 static void 784 vnet_ng_iface_uninit(const void *unused) 785 { 786 787 delete_unrhdr(V_ng_iface_unit); 788 } 789 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, 790 vnet_ng_iface_uninit, NULL);
Cache object: 5d9d87f816577c72fdbe8d3c39ba96b3
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