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/sysctl.h>
  72 #include <sys/syslog.h>
  73 #include <sys/libkern.h>
  74
  75 #include <net/if.h>
  76 #include <net/if_var.h>
  77 #include <net/if_private.h>
  78 #include <net/if_types.h>
  79 #include <net/bpf.h>
  80 #include <net/netisr.h>
  81 #include <net/route.h>
  82 #include <net/vnet.h>
  83
  84 #include <netinet/in.h>
  85
  86 #include <netgraph/ng_message.h>
  87 #include <netgraph/netgraph.h>
  88 #include <netgraph/ng_parse.h>
  89 #include <netgraph/ng_iface.h>
  90
  91 #ifdef NG_SEPARATE_MALLOC
  92 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
  93 #else
  94 #define M_NETGRAPH_IFACE M_NETGRAPH
  95 #endif
  96
  97 static SYSCTL_NODE(_net_graph, OID_AUTO, iface, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  98     "Point to point netgraph interface");
  99 VNET_DEFINE_STATIC(int, ng_iface_max_nest) = 2;
 100 #define V_ng_iface_max_nest     VNET(ng_iface_max_nest)
 101 SYSCTL_INT(_net_graph_iface, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
 102     &VNET_NAME(ng_iface_max_nest), 0, "Max nested tunnels");
 103
 104 /* This struct describes one address family */
 105 struct iffam {
 106         sa_family_t     family;         /* Address family */
 107         const char      *hookname;      /* Name for hook */
 108 };
 109 typedef const struct iffam *iffam_p;
 110
 111 /* List of address families supported by our interface */
 112 const static struct iffam gFamilies[] = {
 113         { AF_INET,      NG_IFACE_HOOK_INET      },
 114         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 115 };
 116 #define NUM_FAMILIES            nitems(gFamilies)
 117
 118 /* Node private data */
 119 struct ng_iface_private {
 120         struct  ifnet *ifp;             /* Our interface */
 121         int     unit;                   /* Interface unit number */
 122         node_p  node;                   /* Our netgraph node */
 123         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 124         struct rmlock   lock;           /* Protect private data changes */
 125 };
 126 typedef struct ng_iface_private *priv_p;
 127
 128 #define PRIV_RLOCK(priv, t)     rm_rlock(&priv->lock, t)
 129 #define PRIV_RUNLOCK(priv, t)   rm_runlock(&priv->lock, t)
 130 #define PRIV_WLOCK(priv)        rm_wlock(&priv->lock)
 131 #define PRIV_WUNLOCK(priv)      rm_wunlock(&priv->lock)
 132
 133 /* Interface methods */
 134 static void     ng_iface_start(struct ifnet *ifp);
 135 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 136 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 137                         const struct sockaddr *dst, struct route *ro);
 138 static void     ng_iface_bpftap(struct ifnet *ifp,
 139                         struct mbuf *m, sa_family_t family);
 140 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 141                         sa_family_t sa);
 142 #ifdef DEBUG
 143 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 144 #endif
 145
 146 /* Netgraph methods */
 147 static int              ng_iface_mod_event(module_t, int, void *);
 148 static ng_constructor_t ng_iface_constructor;
 149 static ng_rcvmsg_t      ng_iface_rcvmsg;
 150 static ng_shutdown_t    ng_iface_shutdown;
 151 static ng_newhook_t     ng_iface_newhook;
 152 static ng_rcvdata_t     ng_iface_rcvdata;
 153 static ng_disconnect_t  ng_iface_disconnect;
 154
 155 /* Helper stuff */
 156 static iffam_p  get_iffam_from_af(sa_family_t family);
 157 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 158 static iffam_p  get_iffam_from_name(const char *name);
 159 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 160
 161 /* List of commands and how to convert arguments to/from ASCII */
 162 static const struct ng_cmdlist ng_iface_cmds[] = {
 163         {
 164           NGM_IFACE_COOKIE,
 165           NGM_IFACE_GET_IFNAME,
 166           "getifname",
 167           NULL,
 168           &ng_parse_string_type
 169         },
 170         {
 171           NGM_IFACE_COOKIE,
 172           NGM_IFACE_POINT2POINT,
 173           "point2point",
 174           NULL,
 175           NULL
 176         },
 177         {
 178           NGM_IFACE_COOKIE,
 179           NGM_IFACE_BROADCAST,
 180           "broadcast",
 181           NULL,
 182           NULL
 183         },
 184         {
 185           NGM_IFACE_COOKIE,
 186           NGM_IFACE_GET_IFINDEX,
 187           "getifindex",
 188           NULL,
 189           &ng_parse_uint32_type
 190         },
 191         { 0 }
 192 };
 193
 194 /* Node type descriptor */
 195 static struct ng_type typestruct = {
 196         .version =      NG_ABI_VERSION,
 197         .name =         NG_IFACE_NODE_TYPE,
 198         .mod_event =    ng_iface_mod_event,
 199         .constructor =  ng_iface_constructor,
 200         .rcvmsg =       ng_iface_rcvmsg,
 201         .shutdown =     ng_iface_shutdown,
 202         .newhook =      ng_iface_newhook,
 203         .rcvdata =      ng_iface_rcvdata,
 204         .disconnect =   ng_iface_disconnect,
 205         .cmdlist =      ng_iface_cmds,
 206 };
 207 NETGRAPH_INIT(iface, &typestruct);
 208
 209 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit);
 210 #define V_ng_iface_unit                 VNET(ng_iface_unit)
 211
 212 /************************************************************************
 213                         HELPER STUFF
 214  ************************************************************************/
 215
 216 /*
 217  * Get the family descriptor from the family ID
 218  */
 219 static __inline iffam_p
 220 get_iffam_from_af(sa_family_t family)
 221 {
 222         iffam_p iffam;
 223         int k;
 224
 225         for (k = 0; k < NUM_FAMILIES; k++) {
 226                 iffam = &gFamilies[k];
 227                 if (iffam->family == family)
 228                         return (iffam);
 229         }
 230         return (NULL);
 231 }
 232
 233 /*
 234  * Get the family descriptor from the hook
 235  */
 236 static __inline iffam_p
 237 get_iffam_from_hook(priv_p priv, hook_p hook)
 238 {
 239         int k;
 240
 241         for (k = 0; k < NUM_FAMILIES; k++)
 242                 if (priv->hooks[k] == hook)
 243                         return (&gFamilies[k]);
 244         return (NULL);
 245 }
 246
 247 /*
 248  * Get the hook from the iffam descriptor
 249  */
 250
 251 static __inline hook_p *
 252 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 253 {
 254         return (&priv->hooks[iffam - gFamilies]);
 255 }
 256
 257 /*
 258  * Get the iffam descriptor from the name
 259  */
 260 static __inline iffam_p
 261 get_iffam_from_name(const char *name)
 262 {
 263         iffam_p iffam;
 264         int k;
 265
 266         for (k = 0; k < NUM_FAMILIES; k++) {
 267                 iffam = &gFamilies[k];
 268                 if (!strcmp(iffam->hookname, name))
 269                         return (iffam);
 270         }
 271         return (NULL);
 272 }
 273
 274 /************************************************************************
 275                         INTERFACE STUFF
 276  ************************************************************************/
 277
 278 /*
 279  * Process an ioctl for the virtual interface
 280  */
 281 static int
 282 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 283 {
 284         struct ifreq *const ifr = (struct ifreq *) data;
 285         int error = 0;
 286
 287 #ifdef DEBUG
 288         ng_iface_print_ioctl(ifp, command, data);
 289 #endif
 290         switch (command) {
 291         /* These two are mostly handled at a higher layer */
 292         case SIOCSIFADDR:
 293                 ifp->if_flags |= IFF_UP;
 294                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 295                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 296                 break;
 297         case SIOCGIFADDR:
 298                 break;
 299
 300         /* Set flags */
 301         case SIOCSIFFLAGS:
 302                 /*
 303                  * If the interface is marked up and stopped, then start it.
 304                  * If it is marked down and running, then stop it.
 305                  */
 306                 if (ifr->ifr_flags & IFF_UP) {
 307                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 308                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 309                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 310                         }
 311                 } else {
 312                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 313                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 314                                     IFF_DRV_OACTIVE);
 315                 }
 316                 break;
 317
 318         /* Set the interface MTU */
 319         case SIOCSIFMTU:
 320                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 321                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 322                         error = EINVAL;
 323                 else
 324                         ifp->if_mtu = ifr->ifr_mtu;
 325                 break;
 326
 327         /* Stuff that's not supported */
 328         case SIOCADDMULTI:
 329         case SIOCDELMULTI:
 330                 error = 0;
 331                 break;
 332         case SIOCSIFPHYS:
 333                 error = EOPNOTSUPP;
 334                 break;
 335
 336         default:
 337                 error = EINVAL;
 338                 break;
 339         }
 340         return (error);
 341 }
 342
 343 /*
 344  * This routine is called to deliver a packet out the interface.
 345  * We simply look at the address family and relay the packet to
 346  * the corresponding hook, if it exists and is connected.
 347  */
 348
 349 static int
 350 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 351         const struct sockaddr *dst, struct route *ro)
 352 {
 353         uint32_t af;
 354         int error;
 355
 356         /* Check interface flags */
 357         if (!((ifp->if_flags & IFF_UP) &&
 358             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 359                 m_freem(m);
 360                 return (ENETDOWN);
 361         }
 362
 363         /* Protect from deadly infinite recursion. */
 364         error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE,
 365             V_ng_iface_max_nest);
 366         if (error) {
 367                 m_freem(m);
 368                 return (error);
 369         }
 370
 371         /* BPF writes need to be handled specially. */
 372         if (dst->sa_family == AF_UNSPEC)
 373                 bcopy(dst->sa_data, &af, sizeof(af));
 374         else
 375                 af = RO_GET_FAMILY(ro, dst);
 376
 377         /* Berkeley packet filter */
 378         ng_iface_bpftap(ifp, m, af);
 379
 380         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 381                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 382                 if (m == NULL) {
 383                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
 384                         return (ENOBUFS);
 385                 }
 386                 *(sa_family_t *)m->m_data = af;
 387                 error = (ifp->if_transmit)(ifp, m);
 388         } else
 389                 error = ng_iface_send(ifp, m, af);
 390
 391         return (error);
 392 }
 393
 394 /*
 395  * Start method is used only when ALTQ is enabled.
 396  */
 397 static void
 398 ng_iface_start(struct ifnet *ifp)
 399 {
 400         struct mbuf *m;
 401         sa_family_t sa;
 402
 403         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 404
 405         for(;;) {
 406                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 407                 if (m == NULL)
 408                         break;
 409                 sa = *mtod(m, sa_family_t *);
 410                 m_adj(m, sizeof(sa_family_t));
 411                 ng_iface_send(ifp, m, sa);
 412         }
 413 }
 414
 415 /*
 416  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 417  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 418  */
 419 static void
 420 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 421 {
 422         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 423         if (bpf_peers_present(ifp->if_bpf)) {
 424                 int32_t family4 = (int32_t)family;
 425                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 426         }
 427 }
 428
 429 /*
 430  * This routine does actual delivery of the packet into the
 431  * netgraph(4). It is called from ng_iface_start() and
 432  * ng_iface_output().
 433  */
 434 static int
 435 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 436 {
 437         struct rm_priotracker priv_tracker;
 438         const priv_p priv = (priv_p) ifp->if_softc;
 439         const iffam_p iffam = get_iffam_from_af(sa);
 440         hook_p hook;
 441         int error;
 442         int len;
 443
 444         /* Check address family to determine hook (if known) */
 445         if (iffam == NULL) {
 446                 m_freem(m);
 447                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 448                 return (EAFNOSUPPORT);
 449         }
 450
 451         /* Copy length before the mbuf gets invalidated. */
 452         len = m->m_pkthdr.len;
 453
 454         PRIV_RLOCK(priv, &priv_tracker);
 455         hook = *get_hook_from_iffam(priv, iffam);
 456         if (hook == NULL) {
 457                 NG_FREE_M(m);
 458                 PRIV_RUNLOCK(priv, &priv_tracker);
 459                 return ENETDOWN;
 460         }
 461         NG_HOOK_REF(hook);
 462         PRIV_RUNLOCK(priv, &priv_tracker);
 463
 464         NG_OUTBOUND_THREAD_REF();
 465         NG_SEND_DATA_ONLY(error, hook, m);
 466         NG_OUTBOUND_THREAD_UNREF();
 467         NG_HOOK_UNREF(hook);
 468
 469         /* Update stats. */
 470         if (error == 0) {
 471                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
 472                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 473         }
 474
 475         return (error);
 476 }
 477
 478 #ifdef DEBUG
 479 /*
 480  * Display an ioctl to the virtual interface
 481  */
 482
 483 static void
 484 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 485 {
 486         char   *str;
 487
 488         switch (command & IOC_DIRMASK) {
 489         case IOC_VOID:
 490                 str = "IO";
 491                 break;
 492         case IOC_OUT:
 493                 str = "IOR";
 494                 break;
 495         case IOC_IN:
 496                 str = "IOW";
 497                 break;
 498         case IOC_INOUT:
 499                 str = "IORW";
 500                 break;
 501         default:
 502                 str = "IO??";
 503         }
 504         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 505                ifp->if_xname,
 506                str,
 507                IOCGROUP(command),
 508                command & 0xff,
 509                IOCPARM_LEN(command));
 510 }
 511 #endif /* DEBUG */
 512
 513 /************************************************************************
 514                         NETGRAPH NODE STUFF
 515  ************************************************************************/
 516
 517 /*
 518  * Constructor for a node
 519  */
 520 static int
 521 ng_iface_constructor(node_p node)
 522 {
 523         struct ifnet *ifp;
 524         priv_p priv;
 525
 526         /* Allocate node and interface private structures */
 527         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
 528         ifp = if_alloc(IFT_PROPVIRTUAL);
 529         if (ifp == NULL) {
 530                 free(priv, M_NETGRAPH_IFACE);
 531                 return (ENOMEM);
 532         }
 533
 534         rm_init(&priv->lock, "ng_iface private rmlock");
 535
 536         /* Link them together */
 537         ifp->if_softc = priv;
 538         priv->ifp = ifp;
 539
 540         /* Get an interface unit number */
 541         priv->unit = alloc_unr(V_ng_iface_unit);
 542
 543         /* Link together node and private info */
 544         NG_NODE_SET_PRIVATE(node, priv);
 545         priv->node = node;
 546
 547         /* Initialize interface structure */
 548         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 549         ifp->if_output = ng_iface_output;
 550         ifp->if_start = ng_iface_start;
 551         ifp->if_ioctl = ng_iface_ioctl;
 552         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 553         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 554         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 555         ifp->if_addrlen = 0;                    /* XXX */
 556         ifp->if_hdrlen = 0;                     /* XXX */
 557         ifp->if_baudrate = 64000;               /* XXX */
 558         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 559         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 560         IFQ_SET_READY(&ifp->if_snd);
 561
 562         /* Give this node the same name as the interface (if possible) */
 563         if (ng_name_node(node, ifp->if_xname) != 0)
 564                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 565                     ifp->if_xname);
 566
 567         /* Attach the interface */
 568         if_attach(ifp);
 569         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 570
 571         /* Done */
 572         return (0);
 573 }
 574
 575 /*
 576  * Give our ok for a hook to be added
 577  */
 578 static int
 579 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 580 {
 581         const iffam_p iffam = get_iffam_from_name(name);
 582         const priv_p priv = NG_NODE_PRIVATE(node);
 583         hook_p *hookptr;
 584
 585         if (iffam == NULL)
 586                 return (EPFNOSUPPORT);
 587         PRIV_WLOCK(priv);
 588         hookptr = get_hook_from_iffam(priv, iffam);
 589         if (*hookptr != NULL) {
 590                 PRIV_WUNLOCK(priv);
 591                 return (EISCONN);
 592         }
 593         *hookptr = hook;
 594         NG_HOOK_HI_STACK(hook);
 595         NG_HOOK_SET_TO_INBOUND(hook);
 596         PRIV_WUNLOCK(priv);
 597         return (0);
 598 }
 599
 600 /*
 601  * Receive a control message
 602  */
 603 static int
 604 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 605 {
 606         const priv_p priv = NG_NODE_PRIVATE(node);
 607         struct ifnet *const ifp = priv->ifp;
 608         struct ng_mesg *resp = NULL;
 609         int error = 0;
 610         struct ng_mesg *msg;
 611
 612         NGI_GET_MSG(item, msg);
 613         switch (msg->header.typecookie) {
 614         case NGM_IFACE_COOKIE:
 615                 switch (msg->header.cmd) {
 616                 case NGM_IFACE_GET_IFNAME:
 617                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 618                         if (resp == NULL) {
 619                                 error = ENOMEM;
 620                                 break;
 621                         }
 622                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 623                         break;
 624
 625                 case NGM_IFACE_POINT2POINT:
 626                 case NGM_IFACE_BROADCAST:
 627                     {
 628                         /* Deny request if interface is UP */
 629                         if ((ifp->if_flags & IFF_UP) != 0)
 630                                 return (EBUSY);
 631
 632                         /* Change flags */
 633                         switch (msg->header.cmd) {
 634                         case NGM_IFACE_POINT2POINT:
 635                                 ifp->if_flags |= IFF_POINTOPOINT;
 636                                 ifp->if_flags &= ~IFF_BROADCAST;
 637                                 break;
 638                         case NGM_IFACE_BROADCAST:
 639                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 640                                 ifp->if_flags |= IFF_BROADCAST;
 641                                 break;
 642                         }
 643                         break;
 644                     }
 645
 646                 case NGM_IFACE_GET_IFINDEX:
 647                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 648                         if (resp == NULL) {
 649                                 error = ENOMEM;
 650                                 break;
 651                         }
 652                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 653                         break;
 654
 655                 default:
 656                         error = EINVAL;
 657                         break;
 658                 }
 659                 break;
 660         case NGM_FLOW_COOKIE:
 661                 switch (msg->header.cmd) {
 662                 case NGM_LINK_IS_UP:
 663                         if_link_state_change(ifp, LINK_STATE_UP);
 664                         break;
 665                 case NGM_LINK_IS_DOWN:
 666                         if_link_state_change(ifp, LINK_STATE_DOWN);
 667                         break;
 668                 default:
 669                         break;
 670                 }
 671                 break;
 672         default:
 673                 error = EINVAL;
 674                 break;
 675         }
 676         NG_RESPOND_MSG(error, node, item, resp);
 677         NG_FREE_MSG(msg);
 678         return (error);
 679 }
 680
 681 /*
 682  * Recive data from a hook. Pass the packet to the correct input routine.
 683  */
 684 static int
 685 ng_iface_rcvdata(hook_p hook, item_p item)
 686 {
 687         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 688         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 689         struct ifnet *const ifp = priv->ifp;
 690         struct epoch_tracker et;
 691         struct mbuf *m;
 692         int isr;
 693
 694         NGI_GET_M(item, m);
 695         NG_FREE_ITEM(item);
 696         /* Sanity checks */
 697         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 698         M_ASSERTPKTHDR(m);
 699         if ((ifp->if_flags & IFF_UP) == 0) {
 700                 NG_FREE_M(m);
 701                 return (ENETDOWN);
 702         }
 703
 704         /* Update interface stats */
 705         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 706         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 707
 708         /* Note receiving interface */
 709         m->m_pkthdr.rcvif = ifp;
 710
 711         /* Berkeley packet filter */
 712         ng_iface_bpftap(ifp, m, iffam->family);
 713
 714         /* Send packet */
 715         switch (iffam->family) {
 716 #ifdef INET
 717         case AF_INET:
 718                 isr = NETISR_IP;
 719                 break;
 720 #endif
 721 #ifdef INET6
 722         case AF_INET6:
 723                 isr = NETISR_IPV6;
 724                 break;
 725 #endif
 726         default:
 727                 m_freem(m);
 728                 return (EAFNOSUPPORT);
 729         }
 730         random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG);
 731         M_SETFIB(m, ifp->if_fib);
 732         CURVNET_SET(ifp->if_vnet);
 733         NET_EPOCH_ENTER(et);
 734         netisr_dispatch(isr, m);
 735         NET_EPOCH_EXIT(et);
 736         CURVNET_RESTORE();
 737         return (0);
 738 }
 739
 740 /*
 741  * Shutdown and remove the node and its associated interface.
 742  */
 743 static int
 744 ng_iface_shutdown(node_p node)
 745 {
 746         const priv_p priv = NG_NODE_PRIVATE(node);
 747
 748         /*
 749          * The ifnet may be in a different vnet than the netgraph node,
 750          * hence we have to change the current vnet context here.
 751          */
 752         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 753         bpfdetach(priv->ifp);
 754         if_detach(priv->ifp);
 755         if_free(priv->ifp);
 756         CURVNET_RESTORE();
 757         priv->ifp = NULL;
 758         free_unr(V_ng_iface_unit, priv->unit);
 759         rm_destroy(&priv->lock);
 760         free(priv, M_NETGRAPH_IFACE);
 761         NG_NODE_SET_PRIVATE(node, NULL);
 762         NG_NODE_UNREF(node);
 763         return (0);
 764 }
 765
 766 /*
 767  * Hook disconnection. Note that we do *not* shutdown when all
 768  * hooks have been disconnected.
 769  */
 770 static int
 771 ng_iface_disconnect(hook_p hook)
 772 {
 773         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 774         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 775
 776         if (iffam == NULL)
 777                 panic("%s", __func__);
 778         PRIV_WLOCK(priv);
 779         *get_hook_from_iffam(priv, iffam) = NULL;
 780         PRIV_WUNLOCK(priv);
 781         return (0);
 782 }
 783
 784 /*
 785  * Handle loading and unloading for this node type.
 786  */
 787 static int
 788 ng_iface_mod_event(module_t mod, int event, void *data)
 789 {
 790         int error = 0;
 791
 792         switch (event) {
 793         case MOD_LOAD:
 794         case MOD_UNLOAD:
 795                 break;
 796         default:
 797                 error = EOPNOTSUPP;
 798                 break;
 799         }
 800         return (error);
 801 }
 802
 803 static void
 804 vnet_ng_iface_init(const void *unused)
 805 {
 806
 807         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 808 }
 809 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
 810     vnet_ng_iface_init, NULL);
 811
 812 static void
 813 vnet_ng_iface_uninit(const void *unused)
 814 {
 815
 816         delete_unrhdr(V_ng_iface_unit);
 817 }
 818 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
 819     vnet_ng_iface_uninit, NULL);