ng_iface.c revision 184205
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: head/sys/netgraph/ng_iface.c 184205 2008-10-23 15:53:51Z des $ 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, IPX, 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_atalk.h" 56#include "opt_inet.h" 57#include "opt_inet6.h" 58#include "opt_ipx.h" 59 60#include <sys/param.h> 61#include <sys/systm.h> 62#include <sys/errno.h> 63#include <sys/kernel.h> 64#include <sys/malloc.h> 65#include <sys/mbuf.h> 66#include <sys/errno.h> 67#include <sys/random.h> 68#include <sys/sockio.h> 69#include <sys/socket.h> 70#include <sys/syslog.h> 71#include <sys/libkern.h> 72#include <sys/vimage.h> 73 74#include <net/if.h> 75#include <net/if_types.h> 76#include <net/bpf.h> 77#include <net/netisr.h> 78 79#include <netinet/in.h> 80 81#include <netgraph/ng_message.h> 82#include <netgraph/netgraph.h> 83#include <netgraph/ng_parse.h> 84#include <netgraph/ng_iface.h> 85#include <netgraph/ng_cisco.h> 86 87#ifdef NG_SEPARATE_MALLOC 88MALLOC_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 */ 94struct iffam { 95 sa_family_t family; /* Address family */ 96 const char *hookname; /* Name for hook */ 97}; 98typedef const struct iffam *iffam_p; 99 100/* List of address families supported by our interface */ 101const static struct iffam gFamilies[] = { 102 { AF_INET, NG_IFACE_HOOK_INET }, 103 { AF_INET6, NG_IFACE_HOOK_INET6 }, 104 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 105 { AF_IPX, NG_IFACE_HOOK_IPX }, 106 { AF_ATM, NG_IFACE_HOOK_ATM }, 107 { AF_NATM, NG_IFACE_HOOK_NATM }, 108}; 109#define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 110 111/* Node private data */ 112struct 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}; 118typedef struct ng_iface_private *priv_p; 119 120/* Interface methods */ 121static void ng_iface_start(struct ifnet *ifp); 122static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 123static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 124 struct sockaddr *dst, struct rtentry *rt0); 125static void ng_iface_bpftap(struct ifnet *ifp, 126 struct mbuf *m, sa_family_t family); 127static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 128 sa_family_t sa); 129#ifdef DEBUG 130static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 131#endif 132 133/* Netgraph methods */ 134static int ng_iface_mod_event(module_t, int, void *); 135static ng_constructor_t ng_iface_constructor; 136static ng_rcvmsg_t ng_iface_rcvmsg; 137static ng_shutdown_t ng_iface_shutdown; 138static ng_newhook_t ng_iface_newhook; 139static ng_rcvdata_t ng_iface_rcvdata; 140static ng_disconnect_t ng_iface_disconnect; 141 142/* Helper stuff */ 143static iffam_p get_iffam_from_af(sa_family_t family); 144static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 145static iffam_p get_iffam_from_name(const char *name); 146static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 147 148/* Parse type for struct ng_cisco_ipaddr */ 149static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 150 = NG_CISCO_IPADDR_TYPE_INFO; 151static const struct ng_parse_type ng_cisco_ipaddr_type = { 152 &ng_parse_struct_type, 153 &ng_cisco_ipaddr_type_fields 154}; 155 156/* List of commands and how to convert arguments to/from ASCII */ 157static const struct ng_cmdlist ng_iface_cmds[] = { 158 { 159 NGM_IFACE_COOKIE, 160 NGM_IFACE_GET_IFNAME, 161 "getifname", 162 NULL, 163 &ng_parse_string_type 164 }, 165 { 166 NGM_IFACE_COOKIE, 167 NGM_IFACE_POINT2POINT, 168 "point2point", 169 NULL, 170 NULL 171 }, 172 { 173 NGM_IFACE_COOKIE, 174 NGM_IFACE_BROADCAST, 175 "broadcast", 176 NULL, 177 NULL 178 }, 179 { 180 NGM_CISCO_COOKIE, 181 NGM_CISCO_GET_IPADDR, 182 "getipaddr", 183 NULL, 184 &ng_cisco_ipaddr_type 185 }, 186 { 187 NGM_IFACE_COOKIE, 188 NGM_IFACE_GET_IFINDEX, 189 "getifindex", 190 NULL, 191 &ng_parse_uint32_type 192 }, 193 { 0 } 194}; 195 196/* Node type descriptor */ 197static struct ng_type typestruct = { 198 .version = NG_ABI_VERSION, 199 .name = NG_IFACE_NODE_TYPE, 200 .mod_event = ng_iface_mod_event, 201 .constructor = ng_iface_constructor, 202 .rcvmsg = ng_iface_rcvmsg, 203 .shutdown = ng_iface_shutdown, 204 .newhook = ng_iface_newhook, 205 .rcvdata = ng_iface_rcvdata, 206 .disconnect = ng_iface_disconnect, 207 .cmdlist = ng_iface_cmds, 208}; 209NETGRAPH_INIT(iface, &typestruct); 210 211static struct unrhdr *ng_iface_unit; 212 213/************************************************************************ 214 HELPER STUFF 215 ************************************************************************/ 216 217/* 218 * Get the family descriptor from the family ID 219 */ 220static __inline iffam_p 221get_iffam_from_af(sa_family_t family) 222{ 223 iffam_p iffam; 224 int k; 225 226 for (k = 0; k < NUM_FAMILIES; k++) { 227 iffam = &gFamilies[k]; 228 if (iffam->family == family) 229 return (iffam); 230 } 231 return (NULL); 232} 233 234/* 235 * Get the family descriptor from the hook 236 */ 237static __inline iffam_p 238get_iffam_from_hook(priv_p priv, hook_p hook) 239{ 240 int k; 241 242 for (k = 0; k < NUM_FAMILIES; k++) 243 if (priv->hooks[k] == hook) 244 return (&gFamilies[k]); 245 return (NULL); 246} 247 248/* 249 * Get the hook from the iffam descriptor 250 */ 251 252static __inline hook_p * 253get_hook_from_iffam(priv_p priv, iffam_p iffam) 254{ 255 return (&priv->hooks[iffam - gFamilies]); 256} 257 258/* 259 * Get the iffam descriptor from the name 260 */ 261static __inline iffam_p 262get_iffam_from_name(const char *name) 263{ 264 iffam_p iffam; 265 int k; 266 267 for (k = 0; k < NUM_FAMILIES; k++) { 268 iffam = &gFamilies[k]; 269 if (!strcmp(iffam->hookname, name)) 270 return (iffam); 271 } 272 return (NULL); 273} 274 275/************************************************************************ 276 INTERFACE STUFF 277 ************************************************************************/ 278 279/* 280 * Process an ioctl for the virtual interface 281 */ 282static int 283ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 284{ 285 struct ifreq *const ifr = (struct ifreq *) data; 286 int s, error = 0; 287 288#ifdef DEBUG 289 ng_iface_print_ioctl(ifp, command, data); 290#endif 291 s = splimp(); 292 switch (command) { 293 294 /* These two are mostly handled at a higher layer */ 295 case SIOCSIFADDR: 296 ifp->if_flags |= IFF_UP; 297 ifp->if_drv_flags |= IFF_DRV_RUNNING; 298 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 299 break; 300 case SIOCGIFADDR: 301 break; 302 303 /* Set flags */ 304 case SIOCSIFFLAGS: 305 /* 306 * If the interface is marked up and stopped, then start it. 307 * If it is marked down and running, then stop it. 308 */ 309 if (ifr->ifr_flags & IFF_UP) { 310 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 311 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 312 ifp->if_drv_flags |= IFF_DRV_RUNNING; 313 } 314 } else { 315 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 316 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 317 IFF_DRV_OACTIVE); 318 } 319 break; 320 321 /* Set the interface MTU */ 322 case SIOCSIFMTU: 323 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 324 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 325 error = EINVAL; 326 else 327 ifp->if_mtu = ifr->ifr_mtu; 328 break; 329 330 /* Stuff that's not supported */ 331 case SIOCADDMULTI: 332 case SIOCDELMULTI: 333 error = 0; 334 break; 335 case SIOCSIFPHYS: 336 error = EOPNOTSUPP; 337 break; 338 339 default: 340 error = EINVAL; 341 break; 342 } 343 (void) splx(s); 344 return (error); 345} 346 347/* 348 * This routine is called to deliver a packet out the interface. 349 * We simply look at the address family and relay the packet to 350 * the corresponding hook, if it exists and is connected. 351 */ 352 353static int 354ng_iface_output(struct ifnet *ifp, struct mbuf *m, 355 struct sockaddr *dst, struct rtentry *rt0) 356{ 357 uint32_t af; 358 int error; 359 360 /* Check interface flags */ 361 if (!((ifp->if_flags & IFF_UP) && 362 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 363 m_freem(m); 364 return (ENETDOWN); 365 } 366 367 /* BPF writes need to be handled specially. */ 368 if (dst->sa_family == AF_UNSPEC) { 369 bcopy(dst->sa_data, &af, sizeof(af)); 370 dst->sa_family = af; 371 } 372 373 /* Berkeley packet filter */ 374 ng_iface_bpftap(ifp, m, dst->sa_family); 375 376 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 377 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT); 378 if (m == NULL) { 379 IFQ_LOCK(&ifp->if_snd); 380 IFQ_INC_DROPS(&ifp->if_snd); 381 IFQ_UNLOCK(&ifp->if_snd); 382 ifp->if_oerrors++; 383 return (ENOBUFS); 384 } 385 *(sa_family_t *)m->m_data = dst->sa_family; 386 IFQ_HANDOFF(ifp, m, error); 387 } else 388 error = ng_iface_send(ifp, m, dst->sa_family); 389 390 return (error); 391} 392 393/* 394 * Start method is used only when ALTQ is enabled. 395 */ 396static void 397ng_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 */ 418static void 419ng_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 */ 433static int 434ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 435{ 436 const priv_p priv = (priv_p) ifp->if_softc; 437 const iffam_p iffam = get_iffam_from_af(sa); 438 int error; 439 int len; 440 441 /* Check address family to determine hook (if known) */ 442 if (iffam == NULL) { 443 m_freem(m); 444 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 445 return (EAFNOSUPPORT); 446 } 447 448 /* Copy length before the mbuf gets invalidated. */ 449 len = m->m_pkthdr.len; 450 451 /* Send packet. If hook is not connected, 452 mbuf will get freed. */ 453 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 454 455 /* Update stats. */ 456 if (error == 0) { 457 ifp->if_obytes += len; 458 ifp->if_opackets++; 459 } 460 461 return (error); 462} 463 464#ifdef DEBUG 465/* 466 * Display an ioctl to the virtual interface 467 */ 468 469static void 470ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 471{ 472 char *str; 473 474 switch (command & IOC_DIRMASK) { 475 case IOC_VOID: 476 str = "IO"; 477 break; 478 case IOC_OUT: 479 str = "IOR"; 480 break; 481 case IOC_IN: 482 str = "IOW"; 483 break; 484 case IOC_INOUT: 485 str = "IORW"; 486 break; 487 default: 488 str = "IO??"; 489 } 490 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 491 ifp->if_xname, 492 str, 493 IOCGROUP(command), 494 command & 0xff, 495 IOCPARM_LEN(command)); 496} 497#endif /* DEBUG */ 498 499/************************************************************************ 500 NETGRAPH NODE STUFF 501 ************************************************************************/ 502 503/* 504 * Constructor for a node 505 */ 506static int 507ng_iface_constructor(node_p node) 508{ 509 INIT_VNET_NETGRAPH(curvnet); 510 struct ifnet *ifp; 511 priv_p priv; 512 513 /* Allocate node and interface private structures */ 514 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 515 if (priv == NULL) 516 return (ENOMEM); 517 ifp = if_alloc(IFT_PROPVIRTUAL); 518 if (ifp == NULL) { 519 free(priv, M_NETGRAPH_IFACE); 520 return (ENOMEM); 521 } 522 523 /* Link them together */ 524 ifp->if_softc = priv; 525 priv->ifp = ifp; 526 527 /* Get an interface unit number */ 528 priv->unit = alloc_unr(V_ng_iface_unit); 529 530 /* Link together node and private info */ 531 NG_NODE_SET_PRIVATE(node, priv); 532 priv->node = node; 533 534 /* Initialize interface structure */ 535 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 536 ifp->if_output = ng_iface_output; 537 ifp->if_start = ng_iface_start; 538 ifp->if_ioctl = ng_iface_ioctl; 539 ifp->if_watchdog = NULL; 540 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 541 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 542 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 543 ifp->if_addrlen = 0; /* XXX */ 544 ifp->if_hdrlen = 0; /* XXX */ 545 ifp->if_baudrate = 64000; /* XXX */ 546 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 547 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 548 IFQ_SET_READY(&ifp->if_snd); 549 550 /* Give this node the same name as the interface (if possible) */ 551 if (ng_name_node(node, ifp->if_xname) != 0) 552 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 553 ifp->if_xname); 554 555 /* Attach the interface */ 556 if_attach(ifp); 557 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 558 559 /* Done */ 560 return (0); 561} 562 563/* 564 * Give our ok for a hook to be added 565 */ 566static int 567ng_iface_newhook(node_p node, hook_p hook, const char *name) 568{ 569 const iffam_p iffam = get_iffam_from_name(name); 570 hook_p *hookptr; 571 572 if (iffam == NULL) 573 return (EPFNOSUPPORT); 574 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 575 if (*hookptr != NULL) 576 return (EISCONN); 577 *hookptr = hook; 578 NG_HOOK_HI_STACK(hook); 579 return (0); 580} 581 582/* 583 * Receive a control message 584 */ 585static int 586ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 587{ 588 const priv_p priv = NG_NODE_PRIVATE(node); 589 struct ifnet *const ifp = priv->ifp; 590 struct ng_mesg *resp = NULL; 591 int error = 0; 592 struct ng_mesg *msg; 593 594 NGI_GET_MSG(item, msg); 595 switch (msg->header.typecookie) { 596 case NGM_IFACE_COOKIE: 597 switch (msg->header.cmd) { 598 case NGM_IFACE_GET_IFNAME: 599 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 600 if (resp == NULL) { 601 error = ENOMEM; 602 break; 603 } 604 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 605 break; 606 607 case NGM_IFACE_POINT2POINT: 608 case NGM_IFACE_BROADCAST: 609 { 610 611 /* Deny request if interface is UP */ 612 if ((ifp->if_flags & IFF_UP) != 0) 613 return (EBUSY); 614 615 /* Change flags */ 616 switch (msg->header.cmd) { 617 case NGM_IFACE_POINT2POINT: 618 ifp->if_flags |= IFF_POINTOPOINT; 619 ifp->if_flags &= ~IFF_BROADCAST; 620 break; 621 case NGM_IFACE_BROADCAST: 622 ifp->if_flags &= ~IFF_POINTOPOINT; 623 ifp->if_flags |= IFF_BROADCAST; 624 break; 625 } 626 break; 627 } 628 629 case NGM_IFACE_GET_IFINDEX: 630 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 631 if (resp == NULL) { 632 error = ENOMEM; 633 break; 634 } 635 *((uint32_t *)resp->data) = priv->ifp->if_index; 636 break; 637 638 default: 639 error = EINVAL; 640 break; 641 } 642 break; 643 case NGM_CISCO_COOKIE: 644 switch (msg->header.cmd) { 645 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 646 { 647 struct ifaddr *ifa; 648 649 /* Return the first configured IP address */ 650 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 651 struct ng_cisco_ipaddr *ips; 652 653 if (ifa->ifa_addr->sa_family != AF_INET) 654 continue; 655 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 656 if (resp == NULL) { 657 error = ENOMEM; 658 break; 659 } 660 ips = (struct ng_cisco_ipaddr *)resp->data; 661 ips->ipaddr = ((struct sockaddr_in *) 662 ifa->ifa_addr)->sin_addr; 663 ips->netmask = ((struct sockaddr_in *) 664 ifa->ifa_netmask)->sin_addr; 665 break; 666 } 667 668 /* No IP addresses on this interface? */ 669 if (ifa == NULL) 670 error = EADDRNOTAVAIL; 671 break; 672 } 673 default: 674 error = EINVAL; 675 break; 676 } 677 break; 678 case NGM_FLOW_COOKIE: 679 switch (msg->header.cmd) { 680 case NGM_LINK_IS_UP: 681 ifp->if_drv_flags |= IFF_DRV_RUNNING; 682 break; 683 case NGM_LINK_IS_DOWN: 684 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 685 break; 686 default: 687 break; 688 } 689 break; 690 default: 691 error = EINVAL; 692 break; 693 } 694 NG_RESPOND_MSG(error, node, item, resp); 695 NG_FREE_MSG(msg); 696 return (error); 697} 698 699/* 700 * Recive data from a hook. Pass the packet to the correct input routine. 701 */ 702static int 703ng_iface_rcvdata(hook_p hook, item_p item) 704{ 705 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 706 const iffam_p iffam = get_iffam_from_hook(priv, hook); 707 struct ifnet *const ifp = priv->ifp; 708 struct mbuf *m; 709 int isr; 710 711 NGI_GET_M(item, m); 712 NG_FREE_ITEM(item); 713 /* Sanity checks */ 714 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 715 M_ASSERTPKTHDR(m); 716 if ((ifp->if_flags & IFF_UP) == 0) { 717 NG_FREE_M(m); 718 return (ENETDOWN); 719 } 720 721 /* Update interface stats */ 722 ifp->if_ipackets++; 723 ifp->if_ibytes += m->m_pkthdr.len; 724 725 /* Note receiving interface */ 726 m->m_pkthdr.rcvif = ifp; 727 728 /* Berkeley packet filter */ 729 ng_iface_bpftap(ifp, m, iffam->family); 730 731 /* Send packet */ 732 switch (iffam->family) { 733#ifdef INET 734 case AF_INET: 735 isr = NETISR_IP; 736 break; 737#endif 738#ifdef INET6 739 case AF_INET6: 740 isr = NETISR_IPV6; 741 break; 742#endif 743#ifdef IPX 744 case AF_IPX: 745 isr = NETISR_IPX; 746 break; 747#endif 748#ifdef NETATALK 749 case AF_APPLETALK: 750 isr = NETISR_ATALK2; 751 break; 752#endif 753 default: 754 m_freem(m); 755 return (EAFNOSUPPORT); 756 } 757 /* First chunk of an mbuf contains good junk */ 758 if (harvest.point_to_point) 759 random_harvest(m, 16, 3, 0, RANDOM_NET); 760 netisr_dispatch(isr, m); 761 return (0); 762} 763 764/* 765 * Shutdown and remove the node and its associated interface. 766 */ 767static int 768ng_iface_shutdown(node_p node) 769{ 770 INIT_VNET_NETGRAPH(curvnet); 771 const priv_p priv = NG_NODE_PRIVATE(node); 772 773 /* 774 * The ifnet may be in a different vnet than the netgraph node, 775 * hence we have to change the current vnet context here. 776 */ 777 CURVNET_SET_QUIET(priv->ifp->if_vnet); 778 bpfdetach(priv->ifp); 779 if_detach(priv->ifp); 780 if_free(priv->ifp); 781 CURVNET_RESTORE(); 782 priv->ifp = NULL; 783 free_unr(V_ng_iface_unit, priv->unit); 784 free(priv, M_NETGRAPH_IFACE); 785 NG_NODE_SET_PRIVATE(node, NULL); 786 NG_NODE_UNREF(node); 787 return (0); 788} 789 790/* 791 * Hook disconnection. Note that we do *not* shutdown when all 792 * hooks have been disconnected. 793 */ 794static int 795ng_iface_disconnect(hook_p hook) 796{ 797 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 798 const iffam_p iffam = get_iffam_from_hook(priv, hook); 799 800 if (iffam == NULL) 801 panic(__func__); 802 *get_hook_from_iffam(priv, iffam) = NULL; 803 return (0); 804} 805 806/* 807 * Handle loading and unloading for this node type. 808 */ 809static int 810ng_iface_mod_event(module_t mod, int event, void *data) 811{ 812 int error = 0; 813 814 switch (event) { 815 case MOD_LOAD: 816 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 817 break; 818 case MOD_UNLOAD: 819 delete_unrhdr(V_ng_iface_unit); 820 break; 821 default: 822 error = EOPNOTSUPP; 823 break; 824 } 825 return (error); 826} 827