ng_iface.c revision 215317
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 215317 2010-11-14 20:38:11Z dim $ 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/proc.h> 68#include <sys/random.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_types.h> 76#include <net/bpf.h> 77#include <net/netisr.h> 78#include <net/route.h> 79#include <net/vnet.h> 80 81#include <netinet/in.h> 82 83#include <netgraph/ng_message.h> 84#include <netgraph/netgraph.h> 85#include <netgraph/ng_parse.h> 86#include <netgraph/ng_iface.h> 87#include <netgraph/ng_cisco.h> 88 89#ifdef NG_SEPARATE_MALLOC 90MALLOC_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 */ 96struct iffam { 97 sa_family_t family; /* Address family */ 98 const char *hookname; /* Name for hook */ 99}; 100typedef const struct iffam *iffam_p; 101 102/* List of address families supported by our interface */ 103const static struct iffam gFamilies[] = { 104 { AF_INET, NG_IFACE_HOOK_INET }, 105 { AF_INET6, NG_IFACE_HOOK_INET6 }, 106 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 107 { AF_IPX, NG_IFACE_HOOK_IPX }, 108 { AF_ATM, NG_IFACE_HOOK_ATM }, 109 { AF_NATM, NG_IFACE_HOOK_NATM }, 110}; 111#define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 112 113/* Node private data */ 114struct ng_iface_private { 115 struct ifnet *ifp; /* Our interface */ 116 int unit; /* Interface unit number */ 117 node_p node; /* Our netgraph node */ 118 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 119}; 120typedef struct ng_iface_private *priv_p; 121 122/* Interface methods */ 123static void ng_iface_start(struct ifnet *ifp); 124static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 125static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 126 struct sockaddr *dst, struct route *ro); 127static void ng_iface_bpftap(struct ifnet *ifp, 128 struct mbuf *m, sa_family_t family); 129static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 130 sa_family_t sa); 131#ifdef DEBUG 132static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 133#endif 134 135/* Netgraph methods */ 136static int ng_iface_mod_event(module_t, int, void *); 137static ng_constructor_t ng_iface_constructor; 138static ng_rcvmsg_t ng_iface_rcvmsg; 139static ng_shutdown_t ng_iface_shutdown; 140static ng_newhook_t ng_iface_newhook; 141static ng_rcvdata_t ng_iface_rcvdata; 142static ng_disconnect_t ng_iface_disconnect; 143 144/* Helper stuff */ 145static iffam_p get_iffam_from_af(sa_family_t family); 146static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 147static iffam_p get_iffam_from_name(const char *name); 148static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 149 150/* Parse type for struct ng_cisco_ipaddr */ 151static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 152 = NG_CISCO_IPADDR_TYPE_INFO; 153static const struct ng_parse_type ng_cisco_ipaddr_type = { 154 &ng_parse_struct_type, 155 &ng_cisco_ipaddr_type_fields 156}; 157 158/* List of commands and how to convert arguments to/from ASCII */ 159static const struct ng_cmdlist ng_iface_cmds[] = { 160 { 161 NGM_IFACE_COOKIE, 162 NGM_IFACE_GET_IFNAME, 163 "getifname", 164 NULL, 165 &ng_parse_string_type 166 }, 167 { 168 NGM_IFACE_COOKIE, 169 NGM_IFACE_POINT2POINT, 170 "point2point", 171 NULL, 172 NULL 173 }, 174 { 175 NGM_IFACE_COOKIE, 176 NGM_IFACE_BROADCAST, 177 "broadcast", 178 NULL, 179 NULL 180 }, 181 { 182 NGM_CISCO_COOKIE, 183 NGM_CISCO_GET_IPADDR, 184 "getipaddr", 185 NULL, 186 &ng_cisco_ipaddr_type 187 }, 188 { 189 NGM_IFACE_COOKIE, 190 NGM_IFACE_GET_IFINDEX, 191 "getifindex", 192 NULL, 193 &ng_parse_uint32_type 194 }, 195 { 0 } 196}; 197 198/* Node type descriptor */ 199static struct ng_type typestruct = { 200 .version = NG_ABI_VERSION, 201 .name = NG_IFACE_NODE_TYPE, 202 .mod_event = ng_iface_mod_event, 203 .constructor = ng_iface_constructor, 204 .rcvmsg = ng_iface_rcvmsg, 205 .shutdown = ng_iface_shutdown, 206 .newhook = ng_iface_newhook, 207 .rcvdata = ng_iface_rcvdata, 208 .disconnect = ng_iface_disconnect, 209 .cmdlist = ng_iface_cmds, 210}; 211NETGRAPH_INIT(iface, &typestruct); 212 213STATIC_VNET_DEFINE(struct unrhdr *, ng_iface_unit); 214#define V_ng_iface_unit VNET(ng_iface_unit) 215 216/************************************************************************ 217 HELPER STUFF 218 ************************************************************************/ 219 220/* 221 * Get the family descriptor from the family ID 222 */ 223static __inline iffam_p 224get_iffam_from_af(sa_family_t family) 225{ 226 iffam_p iffam; 227 int k; 228 229 for (k = 0; k < NUM_FAMILIES; k++) { 230 iffam = &gFamilies[k]; 231 if (iffam->family == family) 232 return (iffam); 233 } 234 return (NULL); 235} 236 237/* 238 * Get the family descriptor from the hook 239 */ 240static __inline iffam_p 241get_iffam_from_hook(priv_p priv, hook_p hook) 242{ 243 int k; 244 245 for (k = 0; k < NUM_FAMILIES; k++) 246 if (priv->hooks[k] == hook) 247 return (&gFamilies[k]); 248 return (NULL); 249} 250 251/* 252 * Get the hook from the iffam descriptor 253 */ 254 255static __inline hook_p * 256get_hook_from_iffam(priv_p priv, iffam_p iffam) 257{ 258 return (&priv->hooks[iffam - gFamilies]); 259} 260 261/* 262 * Get the iffam descriptor from the name 263 */ 264static __inline iffam_p 265get_iffam_from_name(const char *name) 266{ 267 iffam_p iffam; 268 int k; 269 270 for (k = 0; k < NUM_FAMILIES; k++) { 271 iffam = &gFamilies[k]; 272 if (!strcmp(iffam->hookname, name)) 273 return (iffam); 274 } 275 return (NULL); 276} 277 278/************************************************************************ 279 INTERFACE STUFF 280 ************************************************************************/ 281 282/* 283 * Process an ioctl for the virtual interface 284 */ 285static int 286ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 287{ 288 struct ifreq *const ifr = (struct ifreq *) data; 289 int s, error = 0; 290 291#ifdef DEBUG 292 ng_iface_print_ioctl(ifp, command, data); 293#endif 294 s = splimp(); 295 switch (command) { 296 297 /* These two are mostly handled at a higher layer */ 298 case SIOCSIFADDR: 299 ifp->if_flags |= IFF_UP; 300 ifp->if_drv_flags |= IFF_DRV_RUNNING; 301 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 302 break; 303 case SIOCGIFADDR: 304 break; 305 306 /* Set flags */ 307 case SIOCSIFFLAGS: 308 /* 309 * If the interface is marked up and stopped, then start it. 310 * If it is marked down and running, then stop it. 311 */ 312 if (ifr->ifr_flags & IFF_UP) { 313 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 314 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 315 ifp->if_drv_flags |= IFF_DRV_RUNNING; 316 } 317 } else { 318 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 319 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 320 IFF_DRV_OACTIVE); 321 } 322 break; 323 324 /* Set the interface MTU */ 325 case SIOCSIFMTU: 326 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 327 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 328 error = EINVAL; 329 else 330 ifp->if_mtu = ifr->ifr_mtu; 331 break; 332 333 /* Stuff that's not supported */ 334 case SIOCADDMULTI: 335 case SIOCDELMULTI: 336 error = 0; 337 break; 338 case SIOCSIFPHYS: 339 error = EOPNOTSUPP; 340 break; 341 342 default: 343 error = EINVAL; 344 break; 345 } 346 (void) splx(s); 347 return (error); 348} 349 350/* 351 * This routine is called to deliver a packet out the interface. 352 * We simply look at the address family and relay the packet to 353 * the corresponding hook, if it exists and is connected. 354 */ 355 356static int 357ng_iface_output(struct ifnet *ifp, struct mbuf *m, 358 struct sockaddr *dst, struct route *ro) 359{ 360 struct m_tag *mtag; 361 uint32_t af; 362 int error; 363 364 /* Check interface flags */ 365 if (!((ifp->if_flags & IFF_UP) && 366 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 367 m_freem(m); 368 return (ENETDOWN); 369 } 370 371 /* Protect from deadly infinite recursion. */ 372 mtag = NULL; 373 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 374 if (*(struct ifnet **)(mtag + 1) == ifp) { 375 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 376 m_freem(m); 377 return (EDEADLK); 378 } 379 } 380 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 381 M_NOWAIT); 382 if (mtag == NULL) { 383 m_freem(m); 384 return (ENOMEM); 385 } 386 *(struct ifnet **)(mtag + 1) = ifp; 387 m_tag_prepend(m, mtag); 388 389 /* BPF writes need to be handled specially. */ 390 if (dst->sa_family == AF_UNSPEC) { 391 bcopy(dst->sa_data, &af, sizeof(af)); 392 dst->sa_family = af; 393 } 394 395 /* Berkeley packet filter */ 396 ng_iface_bpftap(ifp, m, dst->sa_family); 397 398 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 399 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT); 400 if (m == NULL) { 401 IFQ_LOCK(&ifp->if_snd); 402 IFQ_INC_DROPS(&ifp->if_snd); 403 IFQ_UNLOCK(&ifp->if_snd); 404 ifp->if_oerrors++; 405 return (ENOBUFS); 406 } 407 *(sa_family_t *)m->m_data = dst->sa_family; 408 error = (ifp->if_transmit)(ifp, m); 409 } else 410 error = ng_iface_send(ifp, m, dst->sa_family); 411 412 return (error); 413} 414 415/* 416 * Start method is used only when ALTQ is enabled. 417 */ 418static void 419ng_iface_start(struct ifnet *ifp) 420{ 421 struct mbuf *m; 422 sa_family_t sa; 423 424 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 425 426 for(;;) { 427 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 428 if (m == NULL) 429 break; 430 sa = *mtod(m, sa_family_t *); 431 m_adj(m, sizeof(sa_family_t)); 432 ng_iface_send(ifp, m, sa); 433 } 434} 435 436/* 437 * Flash a packet by the BPF (requires prepending 4 byte AF header) 438 * Note the phoney mbuf; this is OK because BPF treats it read-only. 439 */ 440static void 441ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 442{ 443 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 444 if (bpf_peers_present(ifp->if_bpf)) { 445 int32_t family4 = (int32_t)family; 446 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 447 } 448} 449 450/* 451 * This routine does actual delivery of the packet into the 452 * netgraph(4). It is called from ng_iface_start() and 453 * ng_iface_output(). 454 */ 455static int 456ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 457{ 458 const priv_p priv = (priv_p) ifp->if_softc; 459 const iffam_p iffam = get_iffam_from_af(sa); 460 int error; 461 int len; 462 463 /* Check address family to determine hook (if known) */ 464 if (iffam == NULL) { 465 m_freem(m); 466 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 467 return (EAFNOSUPPORT); 468 } 469 470 /* Copy length before the mbuf gets invalidated. */ 471 len = m->m_pkthdr.len; 472 473 /* Send packet. If hook is not connected, mbuf will get freed. */ 474 NG_OUTBOUND_THREAD_REF(); 475 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 476 NG_OUTBOUND_THREAD_UNREF(); 477 478 /* Update stats. */ 479 if (error == 0) { 480 ifp->if_obytes += len; 481 ifp->if_opackets++; 482 } 483 484 return (error); 485} 486 487#ifdef DEBUG 488/* 489 * Display an ioctl to the virtual interface 490 */ 491 492static void 493ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 494{ 495 char *str; 496 497 switch (command & IOC_DIRMASK) { 498 case IOC_VOID: 499 str = "IO"; 500 break; 501 case IOC_OUT: 502 str = "IOR"; 503 break; 504 case IOC_IN: 505 str = "IOW"; 506 break; 507 case IOC_INOUT: 508 str = "IORW"; 509 break; 510 default: 511 str = "IO??"; 512 } 513 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 514 ifp->if_xname, 515 str, 516 IOCGROUP(command), 517 command & 0xff, 518 IOCPARM_LEN(command)); 519} 520#endif /* DEBUG */ 521 522/************************************************************************ 523 NETGRAPH NODE STUFF 524 ************************************************************************/ 525 526/* 527 * Constructor for a node 528 */ 529static int 530ng_iface_constructor(node_p node) 531{ 532 struct ifnet *ifp; 533 priv_p priv; 534 535 /* Allocate node and interface private structures */ 536 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 537 if (priv == NULL) 538 return (ENOMEM); 539 ifp = if_alloc(IFT_PROPVIRTUAL); 540 if (ifp == NULL) { 541 free(priv, M_NETGRAPH_IFACE); 542 return (ENOMEM); 543 } 544 545 /* Link them together */ 546 ifp->if_softc = priv; 547 priv->ifp = ifp; 548 549 /* Get an interface unit number */ 550 priv->unit = alloc_unr(V_ng_iface_unit); 551 552 /* Link together node and private info */ 553 NG_NODE_SET_PRIVATE(node, priv); 554 priv->node = node; 555 556 /* Initialize interface structure */ 557 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 558 ifp->if_output = ng_iface_output; 559 ifp->if_start = ng_iface_start; 560 ifp->if_ioctl = ng_iface_ioctl; 561 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 562 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 563 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 564 ifp->if_addrlen = 0; /* XXX */ 565 ifp->if_hdrlen = 0; /* XXX */ 566 ifp->if_baudrate = 64000; /* XXX */ 567 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 568 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 569 IFQ_SET_READY(&ifp->if_snd); 570 571 /* Give this node the same name as the interface (if possible) */ 572 if (ng_name_node(node, ifp->if_xname) != 0) 573 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 574 ifp->if_xname); 575 576 /* Attach the interface */ 577 if_attach(ifp); 578 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 579 580 /* Done */ 581 return (0); 582} 583 584/* 585 * Give our ok for a hook to be added 586 */ 587static int 588ng_iface_newhook(node_p node, hook_p hook, const char *name) 589{ 590 const iffam_p iffam = get_iffam_from_name(name); 591 hook_p *hookptr; 592 593 if (iffam == NULL) 594 return (EPFNOSUPPORT); 595 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 596 if (*hookptr != NULL) 597 return (EISCONN); 598 *hookptr = hook; 599 NG_HOOK_HI_STACK(hook); 600 NG_HOOK_SET_TO_INBOUND(hook); 601 return (0); 602} 603 604/* 605 * Receive a control message 606 */ 607static int 608ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 609{ 610 const priv_p priv = NG_NODE_PRIVATE(node); 611 struct ifnet *const ifp = priv->ifp; 612 struct ng_mesg *resp = NULL; 613 int error = 0; 614 struct ng_mesg *msg; 615 616 NGI_GET_MSG(item, msg); 617 switch (msg->header.typecookie) { 618 case NGM_IFACE_COOKIE: 619 switch (msg->header.cmd) { 620 case NGM_IFACE_GET_IFNAME: 621 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 622 if (resp == NULL) { 623 error = ENOMEM; 624 break; 625 } 626 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 627 break; 628 629 case NGM_IFACE_POINT2POINT: 630 case NGM_IFACE_BROADCAST: 631 { 632 633 /* Deny request if interface is UP */ 634 if ((ifp->if_flags & IFF_UP) != 0) 635 return (EBUSY); 636 637 /* Change flags */ 638 switch (msg->header.cmd) { 639 case NGM_IFACE_POINT2POINT: 640 ifp->if_flags |= IFF_POINTOPOINT; 641 ifp->if_flags &= ~IFF_BROADCAST; 642 break; 643 case NGM_IFACE_BROADCAST: 644 ifp->if_flags &= ~IFF_POINTOPOINT; 645 ifp->if_flags |= IFF_BROADCAST; 646 break; 647 } 648 break; 649 } 650 651 case NGM_IFACE_GET_IFINDEX: 652 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 653 if (resp == NULL) { 654 error = ENOMEM; 655 break; 656 } 657 *((uint32_t *)resp->data) = priv->ifp->if_index; 658 break; 659 660 default: 661 error = EINVAL; 662 break; 663 } 664 break; 665 case NGM_CISCO_COOKIE: 666 switch (msg->header.cmd) { 667 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 668 { 669 struct ifaddr *ifa; 670 671 /* Return the first configured IP address */ 672 if_addr_rlock(ifp); 673 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 674 struct ng_cisco_ipaddr *ips; 675 676 if (ifa->ifa_addr->sa_family != AF_INET) 677 continue; 678 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 679 if (resp == NULL) { 680 error = ENOMEM; 681 break; 682 } 683 ips = (struct ng_cisco_ipaddr *)resp->data; 684 ips->ipaddr = ((struct sockaddr_in *) 685 ifa->ifa_addr)->sin_addr; 686 ips->netmask = ((struct sockaddr_in *) 687 ifa->ifa_netmask)->sin_addr; 688 break; 689 } 690 if_addr_runlock(ifp); 691 692 /* No IP addresses on this interface? */ 693 if (ifa == NULL) 694 error = EADDRNOTAVAIL; 695 break; 696 } 697 default: 698 error = EINVAL; 699 break; 700 } 701 break; 702 case NGM_FLOW_COOKIE: 703 switch (msg->header.cmd) { 704 case NGM_LINK_IS_UP: 705 ifp->if_drv_flags |= IFF_DRV_RUNNING; 706 break; 707 case NGM_LINK_IS_DOWN: 708 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 709 break; 710 default: 711 break; 712 } 713 break; 714 default: 715 error = EINVAL; 716 break; 717 } 718 NG_RESPOND_MSG(error, node, item, resp); 719 NG_FREE_MSG(msg); 720 return (error); 721} 722 723/* 724 * Recive data from a hook. Pass the packet to the correct input routine. 725 */ 726static int 727ng_iface_rcvdata(hook_p hook, item_p item) 728{ 729 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 730 const iffam_p iffam = get_iffam_from_hook(priv, hook); 731 struct ifnet *const ifp = priv->ifp; 732 struct mbuf *m; 733 int isr; 734 735 NGI_GET_M(item, m); 736 NG_FREE_ITEM(item); 737 /* Sanity checks */ 738 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 739 M_ASSERTPKTHDR(m); 740 if ((ifp->if_flags & IFF_UP) == 0) { 741 NG_FREE_M(m); 742 return (ENETDOWN); 743 } 744 745 /* Update interface stats */ 746 ifp->if_ipackets++; 747 ifp->if_ibytes += m->m_pkthdr.len; 748 749 /* Note receiving interface */ 750 m->m_pkthdr.rcvif = ifp; 751 752 /* Berkeley packet filter */ 753 ng_iface_bpftap(ifp, m, iffam->family); 754 755 /* Send packet */ 756 switch (iffam->family) { 757#ifdef INET 758 case AF_INET: 759 isr = NETISR_IP; 760 break; 761#endif 762#ifdef INET6 763 case AF_INET6: 764 isr = NETISR_IPV6; 765 break; 766#endif 767#ifdef IPX 768 case AF_IPX: 769 isr = NETISR_IPX; 770 break; 771#endif 772#ifdef NETATALK 773 case AF_APPLETALK: 774 isr = NETISR_ATALK2; 775 break; 776#endif 777 default: 778 m_freem(m); 779 return (EAFNOSUPPORT); 780 } 781 /* First chunk of an mbuf contains good junk */ 782 if (harvest.point_to_point) 783 random_harvest(m, 16, 3, 0, RANDOM_NET); 784 netisr_dispatch(isr, m); 785 return (0); 786} 787 788/* 789 * Shutdown and remove the node and its associated interface. 790 */ 791static int 792ng_iface_shutdown(node_p node) 793{ 794 const priv_p priv = NG_NODE_PRIVATE(node); 795 796 /* 797 * The ifnet may be in a different vnet than the netgraph node, 798 * hence we have to change the current vnet context here. 799 */ 800 CURVNET_SET_QUIET(priv->ifp->if_vnet); 801 bpfdetach(priv->ifp); 802 if_detach(priv->ifp); 803 if_free(priv->ifp); 804 CURVNET_RESTORE(); 805 priv->ifp = NULL; 806 free_unr(V_ng_iface_unit, priv->unit); 807 free(priv, M_NETGRAPH_IFACE); 808 NG_NODE_SET_PRIVATE(node, NULL); 809 NG_NODE_UNREF(node); 810 return (0); 811} 812 813/* 814 * Hook disconnection. Note that we do *not* shutdown when all 815 * hooks have been disconnected. 816 */ 817static int 818ng_iface_disconnect(hook_p hook) 819{ 820 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 821 const iffam_p iffam = get_iffam_from_hook(priv, hook); 822 823 if (iffam == NULL) 824 panic("%s", __func__); 825 *get_hook_from_iffam(priv, iffam) = NULL; 826 return (0); 827} 828 829/* 830 * Handle loading and unloading for this node type. 831 */ 832static int 833ng_iface_mod_event(module_t mod, int event, void *data) 834{ 835 int error = 0; 836 837 switch (event) { 838 case MOD_LOAD: 839 case MOD_UNLOAD: 840 break; 841 default: 842 error = EOPNOTSUPP; 843 break; 844 } 845 return (error); 846} 847 848static void 849vnet_ng_iface_init(const void *unused) 850{ 851 852 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 853} 854VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 855 vnet_ng_iface_init, NULL); 856 857static void 858vnet_ng_iface_uninit(const void *unused) 859{ 860 861 delete_unrhdr(V_ng_iface_unit); 862} 863VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 864 vnet_ng_iface_uninit, NULL); 865