ng_iface.c revision 324176
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: stable/10/sys/netgraph/ng_iface.c 324176 2017-10-01 19:40:29Z eugen $ 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/lock.h> 65#include <sys/malloc.h> 66#include <sys/mbuf.h> 67#include <sys/errno.h> 68#include <sys/proc.h> 69#include <sys/random.h> 70#include <sys/rmlock.h> 71#include <sys/sockio.h> 72#include <sys/socket.h> 73#include <sys/syslog.h> 74#include <sys/libkern.h> 75 76#include <net/if.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#include <netgraph/ng_cisco.h> 90 91#ifdef NG_SEPARATE_MALLOC 92static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node"); 93#else 94#define M_NETGRAPH_IFACE M_NETGRAPH 95#endif 96 97/* This struct describes one address family */ 98struct iffam { 99 sa_family_t family; /* Address family */ 100 const char *hookname; /* Name for hook */ 101}; 102typedef const struct iffam *iffam_p; 103 104/* List of address families supported by our interface */ 105const static struct iffam gFamilies[] = { 106 { AF_INET, NG_IFACE_HOOK_INET }, 107 { AF_INET6, NG_IFACE_HOOK_INET6 }, 108 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 109 { AF_IPX, NG_IFACE_HOOK_IPX }, 110 { AF_ATM, NG_IFACE_HOOK_ATM }, 111 { AF_NATM, NG_IFACE_HOOK_NATM }, 112}; 113#define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 114 115/* Node private data */ 116struct ng_iface_private { 117 struct ifnet *ifp; /* Our interface */ 118 int unit; /* Interface unit number */ 119 node_p node; /* Our netgraph node */ 120 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 121 struct rmlock lock; /* Protect private data changes */ 122}; 123typedef struct ng_iface_private *priv_p; 124 125#define PRIV_RLOCK(priv, t) rm_rlock(&priv->lock, t) 126#define PRIV_RUNLOCK(priv, t) rm_runlock(&priv->lock, t) 127#define PRIV_WLOCK(priv) rm_wlock(&priv->lock) 128#define PRIV_WUNLOCK(priv) rm_wunlock(&priv->lock) 129 130/* Interface methods */ 131static void ng_iface_start(struct ifnet *ifp); 132static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 133static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 134 const struct sockaddr *dst, struct route *ro); 135static void ng_iface_bpftap(struct ifnet *ifp, 136 struct mbuf *m, sa_family_t family); 137static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 138 sa_family_t sa); 139#ifdef DEBUG 140static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 141#endif 142 143/* Netgraph methods */ 144static int ng_iface_mod_event(module_t, int, void *); 145static ng_constructor_t ng_iface_constructor; 146static ng_rcvmsg_t ng_iface_rcvmsg; 147static ng_shutdown_t ng_iface_shutdown; 148static ng_newhook_t ng_iface_newhook; 149static ng_rcvdata_t ng_iface_rcvdata; 150static ng_disconnect_t ng_iface_disconnect; 151 152/* Helper stuff */ 153static iffam_p get_iffam_from_af(sa_family_t family); 154static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 155static iffam_p get_iffam_from_name(const char *name); 156static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 157 158/* Parse type for struct ng_cisco_ipaddr */ 159static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 160 = NG_CISCO_IPADDR_TYPE_INFO; 161static const struct ng_parse_type ng_cisco_ipaddr_type = { 162 &ng_parse_struct_type, 163 &ng_cisco_ipaddr_type_fields 164}; 165 166/* List of commands and how to convert arguments to/from ASCII */ 167static const struct ng_cmdlist ng_iface_cmds[] = { 168 { 169 NGM_IFACE_COOKIE, 170 NGM_IFACE_GET_IFNAME, 171 "getifname", 172 NULL, 173 &ng_parse_string_type 174 }, 175 { 176 NGM_IFACE_COOKIE, 177 NGM_IFACE_POINT2POINT, 178 "point2point", 179 NULL, 180 NULL 181 }, 182 { 183 NGM_IFACE_COOKIE, 184 NGM_IFACE_BROADCAST, 185 "broadcast", 186 NULL, 187 NULL 188 }, 189 { 190 NGM_CISCO_COOKIE, 191 NGM_CISCO_GET_IPADDR, 192 "getipaddr", 193 NULL, 194 &ng_cisco_ipaddr_type 195 }, 196 { 197 NGM_IFACE_COOKIE, 198 NGM_IFACE_GET_IFINDEX, 199 "getifindex", 200 NULL, 201 &ng_parse_uint32_type 202 }, 203 { 0 } 204}; 205 206/* Node type descriptor */ 207static struct ng_type typestruct = { 208 .version = NG_ABI_VERSION, 209 .name = NG_IFACE_NODE_TYPE, 210 .mod_event = ng_iface_mod_event, 211 .constructor = ng_iface_constructor, 212 .rcvmsg = ng_iface_rcvmsg, 213 .shutdown = ng_iface_shutdown, 214 .newhook = ng_iface_newhook, 215 .rcvdata = ng_iface_rcvdata, 216 .disconnect = ng_iface_disconnect, 217 .cmdlist = ng_iface_cmds, 218}; 219NETGRAPH_INIT(iface, &typestruct); 220 221static VNET_DEFINE(struct unrhdr *, ng_iface_unit); 222#define V_ng_iface_unit VNET(ng_iface_unit) 223 224/************************************************************************ 225 HELPER STUFF 226 ************************************************************************/ 227 228/* 229 * Get the family descriptor from the family ID 230 */ 231static __inline iffam_p 232get_iffam_from_af(sa_family_t family) 233{ 234 iffam_p iffam; 235 int k; 236 237 for (k = 0; k < NUM_FAMILIES; k++) { 238 iffam = &gFamilies[k]; 239 if (iffam->family == family) 240 return (iffam); 241 } 242 return (NULL); 243} 244 245/* 246 * Get the family descriptor from the hook 247 */ 248static __inline iffam_p 249get_iffam_from_hook(priv_p priv, hook_p hook) 250{ 251 int k; 252 253 for (k = 0; k < NUM_FAMILIES; k++) 254 if (priv->hooks[k] == hook) 255 return (&gFamilies[k]); 256 return (NULL); 257} 258 259/* 260 * Get the hook from the iffam descriptor 261 */ 262 263static __inline hook_p * 264get_hook_from_iffam(priv_p priv, iffam_p iffam) 265{ 266 return (&priv->hooks[iffam - gFamilies]); 267} 268 269/* 270 * Get the iffam descriptor from the name 271 */ 272static __inline iffam_p 273get_iffam_from_name(const char *name) 274{ 275 iffam_p iffam; 276 int k; 277 278 for (k = 0; k < NUM_FAMILIES; k++) { 279 iffam = &gFamilies[k]; 280 if (!strcmp(iffam->hookname, name)) 281 return (iffam); 282 } 283 return (NULL); 284} 285 286/************************************************************************ 287 INTERFACE STUFF 288 ************************************************************************/ 289 290/* 291 * Process an ioctl for the virtual interface 292 */ 293static int 294ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 295{ 296 struct ifreq *const ifr = (struct ifreq *) data; 297 int error = 0; 298 299#ifdef DEBUG 300 ng_iface_print_ioctl(ifp, command, data); 301#endif 302 switch (command) { 303 304 /* These two are mostly handled at a higher layer */ 305 case SIOCSIFADDR: 306 ifp->if_flags |= IFF_UP; 307 ifp->if_drv_flags |= IFF_DRV_RUNNING; 308 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 309 break; 310 case SIOCGIFADDR: 311 break; 312 313 /* Set flags */ 314 case SIOCSIFFLAGS: 315 /* 316 * If the interface is marked up and stopped, then start it. 317 * If it is marked down and running, then stop it. 318 */ 319 if (ifr->ifr_flags & IFF_UP) { 320 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 321 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 322 ifp->if_drv_flags |= IFF_DRV_RUNNING; 323 } 324 } else { 325 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 326 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 327 IFF_DRV_OACTIVE); 328 } 329 break; 330 331 /* Set the interface MTU */ 332 case SIOCSIFMTU: 333 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 334 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 335 error = EINVAL; 336 else 337 ifp->if_mtu = ifr->ifr_mtu; 338 break; 339 340 /* Stuff that's not supported */ 341 case SIOCADDMULTI: 342 case SIOCDELMULTI: 343 error = 0; 344 break; 345 case SIOCSIFPHYS: 346 error = EOPNOTSUPP; 347 break; 348 349 default: 350 error = EINVAL; 351 break; 352 } 353 return (error); 354} 355 356/* 357 * This routine is called to deliver a packet out the interface. 358 * We simply look at the address family and relay the packet to 359 * the corresponding hook, if it exists and is connected. 360 */ 361 362static int 363ng_iface_output(struct ifnet *ifp, struct mbuf *m, 364 const struct sockaddr *dst, struct route *ro) 365{ 366 struct m_tag *mtag; 367 uint32_t af; 368 int error; 369 370 /* Check interface flags */ 371 if (!((ifp->if_flags & IFF_UP) && 372 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 373 m_freem(m); 374 return (ENETDOWN); 375 } 376 377 /* Protect from deadly infinite recursion. */ 378 mtag = NULL; 379 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 380 if (*(struct ifnet **)(mtag + 1) == ifp) { 381 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 382 m_freem(m); 383 return (EDEADLK); 384 } 385 } 386 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 387 M_NOWAIT); 388 if (mtag == NULL) { 389 m_freem(m); 390 return (ENOMEM); 391 } 392 *(struct ifnet **)(mtag + 1) = ifp; 393 m_tag_prepend(m, mtag); 394 395 /* BPF writes need to be handled specially. */ 396 if (dst->sa_family == AF_UNSPEC) 397 bcopy(dst->sa_data, &af, sizeof(af)); 398 else 399 af = dst->sa_family; 400 401 /* Berkeley packet filter */ 402 ng_iface_bpftap(ifp, m, af); 403 404 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 405 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 406 if (m == NULL) { 407 IFQ_LOCK(&ifp->if_snd); 408 IFQ_INC_DROPS(&ifp->if_snd); 409 IFQ_UNLOCK(&ifp->if_snd); 410 ifp->if_oerrors++; 411 return (ENOBUFS); 412 } 413 *(sa_family_t *)m->m_data = af; 414 error = (ifp->if_transmit)(ifp, m); 415 } else 416 error = ng_iface_send(ifp, m, af); 417 418 return (error); 419} 420 421/* 422 * Start method is used only when ALTQ is enabled. 423 */ 424static void 425ng_iface_start(struct ifnet *ifp) 426{ 427 struct mbuf *m; 428 sa_family_t sa; 429 430 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 431 432 for(;;) { 433 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 434 if (m == NULL) 435 break; 436 sa = *mtod(m, sa_family_t *); 437 m_adj(m, sizeof(sa_family_t)); 438 ng_iface_send(ifp, m, sa); 439 } 440} 441 442/* 443 * Flash a packet by the BPF (requires prepending 4 byte AF header) 444 * Note the phoney mbuf; this is OK because BPF treats it read-only. 445 */ 446static void 447ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 448{ 449 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 450 if (bpf_peers_present(ifp->if_bpf)) { 451 int32_t family4 = (int32_t)family; 452 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 453 } 454} 455 456/* 457 * This routine does actual delivery of the packet into the 458 * netgraph(4). It is called from ng_iface_start() and 459 * ng_iface_output(). 460 */ 461static int 462ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 463{ 464 struct rm_priotracker priv_tracker; 465 const priv_p priv = (priv_p) ifp->if_softc; 466 const iffam_p iffam = get_iffam_from_af(sa); 467 hook_p hook; 468 int error; 469 int len; 470 471 /* Check address family to determine hook (if known) */ 472 if (iffam == NULL) { 473 m_freem(m); 474 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 475 return (EAFNOSUPPORT); 476 } 477 478 /* Copy length before the mbuf gets invalidated. */ 479 len = m->m_pkthdr.len; 480 481 PRIV_RLOCK(priv, &priv_tracker); 482 hook = *get_hook_from_iffam(priv, iffam); 483 if (hook == NULL) { 484 NG_FREE_M(m); 485 PRIV_RUNLOCK(priv, &priv_tracker); 486 return ENETDOWN; 487 } 488 NG_HOOK_REF(hook); 489 PRIV_RUNLOCK(priv, &priv_tracker); 490 491 NG_OUTBOUND_THREAD_REF(); 492 NG_SEND_DATA_ONLY(error, hook, m); 493 NG_OUTBOUND_THREAD_UNREF(); 494 NG_HOOK_UNREF(hook); 495 496 /* Update stats. */ 497 if (error == 0) { 498 ifp->if_obytes += len; 499 ifp->if_opackets++; 500 } 501 502 return (error); 503} 504 505#ifdef DEBUG 506/* 507 * Display an ioctl to the virtual interface 508 */ 509 510static void 511ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 512{ 513 char *str; 514 515 switch (command & IOC_DIRMASK) { 516 case IOC_VOID: 517 str = "IO"; 518 break; 519 case IOC_OUT: 520 str = "IOR"; 521 break; 522 case IOC_IN: 523 str = "IOW"; 524 break; 525 case IOC_INOUT: 526 str = "IORW"; 527 break; 528 default: 529 str = "IO??"; 530 } 531 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 532 ifp->if_xname, 533 str, 534 IOCGROUP(command), 535 command & 0xff, 536 IOCPARM_LEN(command)); 537} 538#endif /* DEBUG */ 539 540/************************************************************************ 541 NETGRAPH NODE STUFF 542 ************************************************************************/ 543 544/* 545 * Constructor for a node 546 */ 547static int 548ng_iface_constructor(node_p node) 549{ 550 struct ifnet *ifp; 551 priv_p priv; 552 553 /* Allocate node and interface private structures */ 554 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 555 ifp = if_alloc(IFT_PROPVIRTUAL); 556 if (ifp == NULL) { 557 free(priv, M_NETGRAPH_IFACE); 558 return (ENOMEM); 559 } 560 561 rm_init(&priv->lock, "ng_iface private rmlock"); 562 563 /* Link them together */ 564 ifp->if_softc = priv; 565 priv->ifp = ifp; 566 567 /* Get an interface unit number */ 568 priv->unit = alloc_unr(V_ng_iface_unit); 569 570 /* Link together node and private info */ 571 NG_NODE_SET_PRIVATE(node, priv); 572 priv->node = node; 573 574 /* Initialize interface structure */ 575 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 576 ifp->if_output = ng_iface_output; 577 ifp->if_start = ng_iface_start; 578 ifp->if_ioctl = ng_iface_ioctl; 579 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 580 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 581 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 582 ifp->if_addrlen = 0; /* XXX */ 583 ifp->if_hdrlen = 0; /* XXX */ 584 ifp->if_baudrate = 64000; /* XXX */ 585 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 586 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 587 IFQ_SET_READY(&ifp->if_snd); 588 589 /* Give this node the same name as the interface (if possible) */ 590 if (ng_name_node(node, ifp->if_xname) != 0) 591 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 592 ifp->if_xname); 593 594 /* Attach the interface */ 595 if_attach(ifp); 596 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 597 598 /* Done */ 599 return (0); 600} 601 602/* 603 * Give our ok for a hook to be added 604 */ 605static int 606ng_iface_newhook(node_p node, hook_p hook, const char *name) 607{ 608 const iffam_p iffam = get_iffam_from_name(name); 609 const priv_p priv = NG_NODE_PRIVATE(node); 610 hook_p *hookptr; 611 612 if (iffam == NULL) 613 return (EPFNOSUPPORT); 614 PRIV_WLOCK(priv); 615 hookptr = get_hook_from_iffam(priv, iffam); 616 if (*hookptr != NULL) { 617 PRIV_WUNLOCK(priv); 618 return (EISCONN); 619 } 620 *hookptr = hook; 621 NG_HOOK_HI_STACK(hook); 622 NG_HOOK_SET_TO_INBOUND(hook); 623 PRIV_WUNLOCK(priv); 624 return (0); 625} 626 627/* 628 * Receive a control message 629 */ 630static int 631ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 632{ 633 const priv_p priv = NG_NODE_PRIVATE(node); 634 struct ifnet *const ifp = priv->ifp; 635 struct ng_mesg *resp = NULL; 636 int error = 0; 637 struct ng_mesg *msg; 638 639 NGI_GET_MSG(item, msg); 640 switch (msg->header.typecookie) { 641 case NGM_IFACE_COOKIE: 642 switch (msg->header.cmd) { 643 case NGM_IFACE_GET_IFNAME: 644 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 645 if (resp == NULL) { 646 error = ENOMEM; 647 break; 648 } 649 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 650 break; 651 652 case NGM_IFACE_POINT2POINT: 653 case NGM_IFACE_BROADCAST: 654 { 655 656 /* Deny request if interface is UP */ 657 if ((ifp->if_flags & IFF_UP) != 0) 658 return (EBUSY); 659 660 /* Change flags */ 661 switch (msg->header.cmd) { 662 case NGM_IFACE_POINT2POINT: 663 ifp->if_flags |= IFF_POINTOPOINT; 664 ifp->if_flags &= ~IFF_BROADCAST; 665 break; 666 case NGM_IFACE_BROADCAST: 667 ifp->if_flags &= ~IFF_POINTOPOINT; 668 ifp->if_flags |= IFF_BROADCAST; 669 break; 670 } 671 break; 672 } 673 674 case NGM_IFACE_GET_IFINDEX: 675 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 676 if (resp == NULL) { 677 error = ENOMEM; 678 break; 679 } 680 *((uint32_t *)resp->data) = priv->ifp->if_index; 681 break; 682 683 default: 684 error = EINVAL; 685 break; 686 } 687 break; 688 case NGM_CISCO_COOKIE: 689 switch (msg->header.cmd) { 690 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 691 { 692 struct ifaddr *ifa; 693 694 /* Return the first configured IP address */ 695 if_addr_rlock(ifp); 696 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 697 struct ng_cisco_ipaddr *ips; 698 699 if (ifa->ifa_addr->sa_family != AF_INET) 700 continue; 701 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 702 if (resp == NULL) { 703 error = ENOMEM; 704 break; 705 } 706 ips = (struct ng_cisco_ipaddr *)resp->data; 707 ips->ipaddr = ((struct sockaddr_in *) 708 ifa->ifa_addr)->sin_addr; 709 ips->netmask = ((struct sockaddr_in *) 710 ifa->ifa_netmask)->sin_addr; 711 break; 712 } 713 if_addr_runlock(ifp); 714 715 /* No IP addresses on this interface? */ 716 if (ifa == NULL) 717 error = EADDRNOTAVAIL; 718 break; 719 } 720 default: 721 error = EINVAL; 722 break; 723 } 724 break; 725 case NGM_FLOW_COOKIE: 726 switch (msg->header.cmd) { 727 case NGM_LINK_IS_UP: 728 ifp->if_drv_flags |= IFF_DRV_RUNNING; 729 break; 730 case NGM_LINK_IS_DOWN: 731 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 732 break; 733 default: 734 break; 735 } 736 break; 737 default: 738 error = EINVAL; 739 break; 740 } 741 NG_RESPOND_MSG(error, node, item, resp); 742 NG_FREE_MSG(msg); 743 return (error); 744} 745 746/* 747 * Recive data from a hook. Pass the packet to the correct input routine. 748 */ 749static int 750ng_iface_rcvdata(hook_p hook, item_p item) 751{ 752 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 753 const iffam_p iffam = get_iffam_from_hook(priv, hook); 754 struct ifnet *const ifp = priv->ifp; 755 struct mbuf *m; 756 int isr; 757 758 NGI_GET_M(item, m); 759 NG_FREE_ITEM(item); 760 /* Sanity checks */ 761 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 762 M_ASSERTPKTHDR(m); 763 if ((ifp->if_flags & IFF_UP) == 0) { 764 NG_FREE_M(m); 765 return (ENETDOWN); 766 } 767 768 /* Update interface stats */ 769 ifp->if_ipackets++; 770 ifp->if_ibytes += m->m_pkthdr.len; 771 772 /* Note receiving interface */ 773 m->m_pkthdr.rcvif = ifp; 774 775 /* Berkeley packet filter */ 776 ng_iface_bpftap(ifp, m, iffam->family); 777 778 /* Send packet */ 779 switch (iffam->family) { 780#ifdef INET 781 case AF_INET: 782 isr = NETISR_IP; 783 break; 784#endif 785#ifdef INET6 786 case AF_INET6: 787 isr = NETISR_IPV6; 788 break; 789#endif 790#ifdef IPX 791 case AF_IPX: 792 isr = NETISR_IPX; 793 break; 794#endif 795#ifdef NETATALK 796 case AF_APPLETALK: 797 isr = NETISR_ATALK2; 798 break; 799#endif 800 default: 801 m_freem(m); 802 return (EAFNOSUPPORT); 803 } 804 if (harvest.point_to_point) 805 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_NG); 806 M_SETFIB(m, ifp->if_fib); 807 netisr_dispatch(isr, m); 808 return (0); 809} 810 811/* 812 * Shutdown and remove the node and its associated interface. 813 */ 814static int 815ng_iface_shutdown(node_p node) 816{ 817 const priv_p priv = NG_NODE_PRIVATE(node); 818 819 /* 820 * The ifnet may be in a different vnet than the netgraph node, 821 * hence we have to change the current vnet context here. 822 */ 823 CURVNET_SET_QUIET(priv->ifp->if_vnet); 824 bpfdetach(priv->ifp); 825 if_detach(priv->ifp); 826 if_free(priv->ifp); 827 CURVNET_RESTORE(); 828 priv->ifp = NULL; 829 free_unr(V_ng_iface_unit, priv->unit); 830 rm_destroy(&priv->lock); 831 free(priv, M_NETGRAPH_IFACE); 832 NG_NODE_SET_PRIVATE(node, NULL); 833 NG_NODE_UNREF(node); 834 return (0); 835} 836 837/* 838 * Hook disconnection. Note that we do *not* shutdown when all 839 * hooks have been disconnected. 840 */ 841static int 842ng_iface_disconnect(hook_p hook) 843{ 844 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 845 const iffam_p iffam = get_iffam_from_hook(priv, hook); 846 847 if (iffam == NULL) 848 panic("%s", __func__); 849 PRIV_WLOCK(priv); 850 *get_hook_from_iffam(priv, iffam) = NULL; 851 PRIV_WUNLOCK(priv); 852 return (0); 853} 854 855/* 856 * Handle loading and unloading for this node type. 857 */ 858static int 859ng_iface_mod_event(module_t mod, int event, void *data) 860{ 861 int error = 0; 862 863 switch (event) { 864 case MOD_LOAD: 865 case MOD_UNLOAD: 866 break; 867 default: 868 error = EOPNOTSUPP; 869 break; 870 } 871 return (error); 872} 873 874static void 875vnet_ng_iface_init(const void *unused) 876{ 877 878 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 879} 880VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 881 vnet_ng_iface_init, NULL); 882 883static void 884vnet_ng_iface_uninit(const void *unused) 885{ 886 887 delete_unrhdr(V_ng_iface_unit); 888} 889VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 890 vnet_ng_iface_uninit, NULL); 891