sys/netgraph/ng_iface.c

   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 VNET_DEFINE_STATIC(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         uint32_t af;
 348         int error;
 349
 350         /* Check interface flags */
 351         if (!((ifp->if_flags & IFF_UP) &&
 352             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 353                 m_freem(m);
 354                 return (ENETDOWN);
 355         }
 356
 357         /* Protect from deadly infinite recursion. */
 358         error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE, 1);
 359         if (error) {
 360                 m_freem(m);
 361                 return (error);
 362         }
 363
 364         /* BPF writes need to be handled specially. */
 365         if (dst->sa_family == AF_UNSPEC)
 366                 bcopy(dst->sa_data, &af, sizeof(af));
 367         else
 368                 af = dst->sa_family;
 369
 370         /* Berkeley packet filter */
 371         ng_iface_bpftap(ifp, m, af);
 372
 373         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 374                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 375                 if (m == NULL) {
 376                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
 377                         return (ENOBUFS);
 378                 }
 379                 *(sa_family_t *)m->m_data = af;
 380                 error = (ifp->if_transmit)(ifp, m);
 381         } else
 382                 error = ng_iface_send(ifp, m, af);
 383
 384         return (error);
 385 }
 386
 387 /*
 388  * Start method is used only when ALTQ is enabled.
 389  */
 390 static void
 391 ng_iface_start(struct ifnet *ifp)
 392 {
 393         struct mbuf *m;
 394         sa_family_t sa;
 395
 396         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 397
 398         for(;;) {
 399                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 400                 if (m == NULL)
 401                         break;
 402                 sa = *mtod(m, sa_family_t *);
 403                 m_adj(m, sizeof(sa_family_t));
 404                 ng_iface_send(ifp, m, sa);
 405         }
 406 }
 407
 408 /*
 409  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 410  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 411  */
 412 static void
 413 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 414 {
 415         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 416         if (bpf_peers_present(ifp->if_bpf)) {
 417                 int32_t family4 = (int32_t)family;
 418                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 419         }
 420 }
 421
 422 /*
 423  * This routine does actual delivery of the packet into the
 424  * netgraph(4). It is called from ng_iface_start() and
 425  * ng_iface_output().
 426  */
 427 static int
 428 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 429 {
 430         struct rm_priotracker priv_tracker;
 431         const priv_p priv = (priv_p) ifp->if_softc;
 432         const iffam_p iffam = get_iffam_from_af(sa);
 433         hook_p hook;
 434         int error;
 435         int len;
 436
 437         /* Check address family to determine hook (if known) */
 438         if (iffam == NULL) {
 439                 m_freem(m);
 440                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 441                 return (EAFNOSUPPORT);
 442         }
 443
 444         /* Copy length before the mbuf gets invalidated. */
 445         len = m->m_pkthdr.len;
 446
 447         PRIV_RLOCK(priv, &priv_tracker);
 448         hook = *get_hook_from_iffam(priv, iffam);
 449         if (hook == NULL) {
 450                 NG_FREE_M(m);
 451                 PRIV_RUNLOCK(priv, &priv_tracker);
 452                 return ENETDOWN;
 453         }
 454         NG_HOOK_REF(hook);
 455         PRIV_RUNLOCK(priv, &priv_tracker);
 456
 457         NG_OUTBOUND_THREAD_REF();
 458         NG_SEND_DATA_ONLY(error, hook, m);
 459         NG_OUTBOUND_THREAD_UNREF();
 460         NG_HOOK_UNREF(hook);
 461
 462         /* Update stats. */
 463         if (error == 0) {
 464                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
 465                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 466         }
 467
 468         return (error);
 469 }
 470
 471 #ifdef DEBUG
 472 /*
 473  * Display an ioctl to the virtual interface
 474  */
 475
 476 static void
 477 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 478 {
 479         char   *str;
 480
 481         switch (command & IOC_DIRMASK) {
 482         case IOC_VOID:
 483                 str = "IO";
 484                 break;
 485         case IOC_OUT:
 486                 str = "IOR";
 487                 break;
 488         case IOC_IN:
 489                 str = "IOW";
 490                 break;
 491         case IOC_INOUT:
 492                 str = "IORW";
 493                 break;
 494         default:
 495                 str = "IO??";
 496         }
 497         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 498                ifp->if_xname,
 499                str,
 500                IOCGROUP(command),
 501                command & 0xff,
 502                IOCPARM_LEN(command));
 503 }
 504 #endif /* DEBUG */
 505
 506 /************************************************************************
 507                         NETGRAPH NODE STUFF
 508  ************************************************************************/
 509
 510 /*
 511  * Constructor for a node
 512  */
 513 static int
 514 ng_iface_constructor(node_p node)
 515 {
 516         struct ifnet *ifp;
 517         priv_p priv;
 518
 519         /* Allocate node and interface private structures */
 520         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
 521         ifp = if_alloc(IFT_PROPVIRTUAL);
 522         if (ifp == NULL) {
 523                 free(priv, M_NETGRAPH_IFACE);
 524                 return (ENOMEM);
 525         }
 526
 527         rm_init(&priv->lock, "ng_iface private rmlock");
 528
 529         /* Link them together */
 530         ifp->if_softc = priv;
 531         priv->ifp = ifp;
 532
 533         /* Get an interface unit number */
 534         priv->unit = alloc_unr(V_ng_iface_unit);
 535
 536         /* Link together node and private info */
 537         NG_NODE_SET_PRIVATE(node, priv);
 538         priv->node = node;
 539
 540         /* Initialize interface structure */
 541         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 542         ifp->if_output = ng_iface_output;
 543         ifp->if_start = ng_iface_start;
 544         ifp->if_ioctl = ng_iface_ioctl;
 545         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 546         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 547         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 548         ifp->if_addrlen = 0;                    /* XXX */
 549         ifp->if_hdrlen = 0;                     /* XXX */
 550         ifp->if_baudrate = 64000;               /* XXX */
 551         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 552         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 553         IFQ_SET_READY(&ifp->if_snd);
 554
 555         /* Give this node the same name as the interface (if possible) */
 556         if (ng_name_node(node, ifp->if_xname) != 0)
 557                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 558                     ifp->if_xname);
 559
 560         /* Attach the interface */
 561         if_attach(ifp);
 562         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 563
 564         /* Done */
 565         return (0);
 566 }
 567
 568 /*
 569  * Give our ok for a hook to be added
 570  */
 571 static int
 572 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 573 {
 574         const iffam_p iffam = get_iffam_from_name(name);
 575         const priv_p priv = NG_NODE_PRIVATE(node);
 576         hook_p *hookptr;
 577
 578         if (iffam == NULL)
 579                 return (EPFNOSUPPORT);
 580         PRIV_WLOCK(priv);
 581         hookptr = get_hook_from_iffam(priv, iffam);
 582         if (*hookptr != NULL) {
 583                 PRIV_WUNLOCK(priv);
 584                 return (EISCONN);
 585         }
 586         *hookptr = hook;
 587         NG_HOOK_HI_STACK(hook);
 588         NG_HOOK_SET_TO_INBOUND(hook);
 589         PRIV_WUNLOCK(priv);
 590         return (0);
 591 }
 592
 593 /*
 594  * Receive a control message
 595  */
 596 static int
 597 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 598 {
 599         const priv_p priv = NG_NODE_PRIVATE(node);
 600         struct ifnet *const ifp = priv->ifp;
 601         struct ng_mesg *resp = NULL;
 602         int error = 0;
 603         struct ng_mesg *msg;
 604
 605         NGI_GET_MSG(item, msg);
 606         switch (msg->header.typecookie) {
 607         case NGM_IFACE_COOKIE:
 608                 switch (msg->header.cmd) {
 609                 case NGM_IFACE_GET_IFNAME:
 610                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 611                         if (resp == NULL) {
 612                                 error = ENOMEM;
 613                                 break;
 614                         }
 615                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 616                         break;
 617
 618                 case NGM_IFACE_POINT2POINT:
 619                 case NGM_IFACE_BROADCAST:
 620                     {
 621
 622                         /* Deny request if interface is UP */
 623                         if ((ifp->if_flags & IFF_UP) != 0)
 624                                 return (EBUSY);
 625
 626                         /* Change flags */
 627                         switch (msg->header.cmd) {
 628                         case NGM_IFACE_POINT2POINT:
 629                                 ifp->if_flags |= IFF_POINTOPOINT;
 630                                 ifp->if_flags &= ~IFF_BROADCAST;
 631                                 break;
 632                         case NGM_IFACE_BROADCAST:
 633                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 634                                 ifp->if_flags |= IFF_BROADCAST;
 635                                 break;
 636                         }
 637                         break;
 638                     }
 639
 640                 case NGM_IFACE_GET_IFINDEX:
 641                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 642                         if (resp == NULL) {
 643                                 error = ENOMEM;
 644                                 break;
 645                         }
 646                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 647                         break;
 648
 649                 default:
 650                         error = EINVAL;
 651                         break;
 652                 }
 653                 break;
 654         case NGM_FLOW_COOKIE:
 655                 switch (msg->header.cmd) {
 656                 case NGM_LINK_IS_UP:
 657                         if_link_state_change(ifp, LINK_STATE_UP);
 658                         break;
 659                 case NGM_LINK_IS_DOWN:
 660                         if_link_state_change(ifp, LINK_STATE_DOWN);
 661                         break;
 662                 default:
 663                         break;
 664                 }
 665                 break;
 666         default:
 667                 error = EINVAL;
 668                 break;
 669         }
 670         NG_RESPOND_MSG(error, node, item, resp);
 671         NG_FREE_MSG(msg);
 672         return (error);
 673 }
 674
 675 /*
 676  * Recive data from a hook. Pass the packet to the correct input routine.
 677  */
 678 static int
 679 ng_iface_rcvdata(hook_p hook, item_p item)
 680 {
 681         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 682         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 683         struct ifnet *const ifp = priv->ifp;
 684         struct mbuf *m;
 685         int isr;
 686
 687         NGI_GET_M(item, m);
 688         NG_FREE_ITEM(item);
 689         /* Sanity checks */
 690         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 691         M_ASSERTPKTHDR(m);
 692         if ((ifp->if_flags & IFF_UP) == 0) {
 693                 NG_FREE_M(m);
 694                 return (ENETDOWN);
 695         }
 696
 697         /* Update interface stats */
 698         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 699         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 700
 701         /* Note receiving interface */
 702         m->m_pkthdr.rcvif = ifp;
 703
 704         /* Berkeley packet filter */
 705         ng_iface_bpftap(ifp, m, iffam->family);
 706
 707         /* Send packet */
 708         switch (iffam->family) {
 709 #ifdef INET
 710         case AF_INET:
 711                 isr = NETISR_IP;
 712                 break;
 713 #endif
 714 #ifdef INET6
 715         case AF_INET6:
 716                 isr = NETISR_IPV6;
 717                 break;
 718 #endif
 719         default:
 720                 m_freem(m);
 721                 return (EAFNOSUPPORT);
 722         }
 723         random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG);
 724         M_SETFIB(m, ifp->if_fib);
 725         netisr_dispatch(isr, m);
 726         return (0);
 727 }
 728
 729 /*
 730  * Shutdown and remove the node and its associated interface.
 731  */
 732 static int
 733 ng_iface_shutdown(node_p node)
 734 {
 735         const priv_p priv = NG_NODE_PRIVATE(node);
 736
 737         /*
 738          * The ifnet may be in a different vnet than the netgraph node,
 739          * hence we have to change the current vnet context here.
 740          */
 741         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 742         bpfdetach(priv->ifp);
 743         if_detach(priv->ifp);
 744         if_free(priv->ifp);
 745         CURVNET_RESTORE();
 746         priv->ifp = NULL;
 747         free_unr(V_ng_iface_unit, priv->unit);
 748         rm_destroy(&priv->lock);
 749         free(priv, M_NETGRAPH_IFACE);
 750         NG_NODE_SET_PRIVATE(node, NULL);
 751         NG_NODE_UNREF(node);
 752         return (0);
 753 }
 754
 755 /*
 756  * Hook disconnection. Note that we do *not* shutdown when all
 757  * hooks have been disconnected.
 758  */
 759 static int
 760 ng_iface_disconnect(hook_p hook)
 761 {
 762         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 763         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 764
 765         if (iffam == NULL)
 766                 panic("%s", __func__);
 767         PRIV_WLOCK(priv);
 768         *get_hook_from_iffam(priv, iffam) = NULL;
 769         PRIV_WUNLOCK(priv);
 770         return (0);
 771 }
 772
 773 /*
 774  * Handle loading and unloading for this node type.
 775  */
 776 static int
 777 ng_iface_mod_event(module_t mod, int event, void *data)
 778 {
 779         int error = 0;
 780
 781         switch (event) {
 782         case MOD_LOAD:
 783         case MOD_UNLOAD:
 784                 break;
 785         default:
 786                 error = EOPNOTSUPP;
 787                 break;
 788         }
 789         return (error);
 790 }
 791
 792 static void
 793 vnet_ng_iface_init(const void *unused)
 794 {
 795
 796         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 797 }
 798 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
 799     vnet_ng_iface_init, NULL);
 800
 801 static void
 802 vnet_ng_iface_uninit(const void *unused)
 803 {
 804
 805         delete_unrhdr(V_ng_iface_unit);
 806 }
 807 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
 808     vnet_ng_iface_uninit, NULL);