sys/netgraph7/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: src/sys/netgraph/ng_iface.c,v 1.48 2008/01/31 08:51:48 mav Exp $
  41  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
  42  */
  43
  44 /*
  45  * This node is also a system networking interface. It has
  46  * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
  47  * are simply relayed between the interface and the hooks.
  48  *
  49  * Interfaces are named ng0, ng1, etc.  New nodes take the
  50  * first available interface name.
  51  *
  52  * This node also includes Berkeley packet filter support.
  53  */
  54
  55 #include "opt_atalk.h"
  56 #include "opt_inet.h"
  57 #include "opt_inet6.h"
  58 #include "opt_ipx.h"
  59
  60 #include <sys/param.h>
  61 #include <sys/systm.h>
  62 #include <sys/errno.h>
  63 #include <sys/kernel.h>
  64 #include <sys/malloc.h>
  65 #include <sys/mbuf.h>
  66 #include <sys/errno.h>
  67 #include <sys/random.h>
  68 #include <sys/sockio.h>
  69 #include <sys/socket.h>
  70 #include <sys/syslog.h>
  71 #include <sys/libkern.h>
  72
  73 #include <net/if.h>
  74 #include <net/if_types.h>
  75 #include <net/bpf.h>
  76 #include <net/netisr.h>
  77
  78 #include <netinet/in.h>
  79
  80 #include <netgraph/ng_message.h>
  81 #include <netgraph/netgraph.h>
  82 #include <netgraph/ng_parse.h>
  83 #include <netgraph/ng_iface.h>
  84 #include <netgraph/ng_cisco.h>
  85
  86 #ifdef NG_SEPARATE_MALLOC
  87 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
  88 #else
  89 #define M_NETGRAPH_IFACE M_NETGRAPH
  90 #endif
  91
  92 /* This struct describes one address family */
  93 struct iffam {
  94         sa_family_t     family;         /* Address family */
  95         const char      *hookname;      /* Name for hook */
  96 };
  97 typedef const struct iffam *iffam_p;
  98
  99 /* List of address families supported by our interface */
 100 const static struct iffam gFamilies[] = {
 101         { AF_INET,      NG_IFACE_HOOK_INET      },
 102         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 103         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
 104         { AF_IPX,       NG_IFACE_HOOK_IPX       },
 105         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 106         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 107 };
 108 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
 109
 110 /* Node private data */
 111 struct ng_iface_private {
 112         struct  ifnet *ifp;             /* Our interface */
 113         int     unit;                   /* Interface unit number */
 114         node_p  node;                   /* Our netgraph node */
 115         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 116 };
 117 typedef struct ng_iface_private *priv_p;
 118
 119 /* Interface methods */
 120 static void     ng_iface_start(struct ifnet *ifp);
 121 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 122 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 123                         struct sockaddr *dst, struct rtentry *rt0);
 124 static void     ng_iface_bpftap(struct ifnet *ifp,
 125                         struct mbuf *m, sa_family_t family);
 126 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 127                         sa_family_t sa);
 128 #ifdef DEBUG
 129 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 130 #endif
 131
 132 /* Netgraph methods */
 133 static int              ng_iface_mod_event(module_t, int, void *);
 134 static ng_constructor_t ng_iface_constructor;
 135 static ng_rcvmsg_t      ng_iface_rcvmsg;
 136 static ng_shutdown_t    ng_iface_shutdown;
 137 static ng_newhook_t     ng_iface_newhook;
 138 static ng_rcvdata_t     ng_iface_rcvdata;
 139 static ng_disconnect_t  ng_iface_disconnect;
 140
 141 /* Helper stuff */
 142 static iffam_p  get_iffam_from_af(sa_family_t family);
 143 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 144 static iffam_p  get_iffam_from_name(const char *name);
 145 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 146
 147 /* Parse type for struct ng_cisco_ipaddr */
 148 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 149         = NG_CISCO_IPADDR_TYPE_INFO;
 150 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 151         &ng_parse_struct_type,
 152         &ng_cisco_ipaddr_type_fields
 153 };
 154
 155 /* List of commands and how to convert arguments to/from ASCII */
 156 static const struct ng_cmdlist ng_iface_cmds[] = {
 157         {
 158           NGM_IFACE_COOKIE,
 159           NGM_IFACE_GET_IFNAME,
 160           "getifname",
 161           NULL,
 162           &ng_parse_string_type
 163         },
 164         {
 165           NGM_IFACE_COOKIE,
 166           NGM_IFACE_POINT2POINT,
 167           "point2point",
 168           NULL,
 169           NULL
 170         },
 171         {
 172           NGM_IFACE_COOKIE,
 173           NGM_IFACE_BROADCAST,
 174           "broadcast",
 175           NULL,
 176           NULL
 177         },
 178         {
 179           NGM_CISCO_COOKIE,
 180           NGM_CISCO_GET_IPADDR,
 181           "getipaddr",
 182           NULL,
 183           &ng_cisco_ipaddr_type
 184         },
 185         {
 186           NGM_IFACE_COOKIE,
 187           NGM_IFACE_GET_IFINDEX,
 188           "getifindex",
 189           NULL,
 190           &ng_parse_uint32_type
 191         },
 192         { 0 }
 193 };
 194
 195 /* Node type descriptor */
 196 static struct ng_type typestruct = {
 197         .version =      NG_ABI_VERSION,
 198         .name =         NG_IFACE_NODE_TYPE,
 199         .mod_event =    ng_iface_mod_event,
 200         .constructor =  ng_iface_constructor,
 201         .rcvmsg =       ng_iface_rcvmsg,
 202         .shutdown =     ng_iface_shutdown,
 203         .newhook =      ng_iface_newhook,
 204         .rcvdata =      ng_iface_rcvdata,
 205         .disconnect =   ng_iface_disconnect,
 206         .cmdlist =      ng_iface_cmds,
 207 };
 208 NETGRAPH_INIT(iface, &typestruct);
 209
 210 static struct unrhdr    *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 s, error = 0;
 286
 287 #ifdef DEBUG
 288         ng_iface_print_ioctl(ifp, command, data);
 289 #endif
 290         s = splimp();
 291         switch (command) {
 292
 293         /* These two are mostly handled at a higher layer */
 294         case SIOCSIFADDR:
 295                 ifp->if_flags |= IFF_UP;
 296                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 297                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 298                 break;
 299         case SIOCGIFADDR:
 300                 break;
 301
 302         /* Set flags */
 303         case SIOCSIFFLAGS:
 304                 /*
 305                  * If the interface is marked up and stopped, then start it.
 306                  * If it is marked down and running, then stop it.
 307                  */
 308                 if (ifr->ifr_flags & IFF_UP) {
 309                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 310                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 311                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 312                         }
 313                 } else {
 314                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 315                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 316                                     IFF_DRV_OACTIVE);
 317                 }
 318                 break;
 319
 320         /* Set the interface MTU */
 321         case SIOCSIFMTU:
 322                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 323                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 324                         error = EINVAL;
 325                 else
 326                         ifp->if_mtu = ifr->ifr_mtu;
 327                 break;
 328
 329         /* Stuff that's not supported */
 330         case SIOCADDMULTI:
 331         case SIOCDELMULTI:
 332                 error = 0;
 333                 break;
 334         case SIOCSIFPHYS:
 335                 error = EOPNOTSUPP;
 336                 break;
 337
 338         default:
 339                 error = EINVAL;
 340                 break;
 341         }
 342         (void) splx(s);
 343         return (error);
 344 }
 345
 346 /*
 347  * This routine is called to deliver a packet out the interface.
 348  * We simply look at the address family and relay the packet to
 349  * the corresponding hook, if it exists and is connected.
 350  */
 351
 352 static int
 353 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 354                 struct sockaddr *dst, struct rtentry *rt0)
 355 {
 356         uint32_t af;
 357         int error;
 358
 359         /* Check interface flags */
 360         if (!((ifp->if_flags & IFF_UP) &&
 361             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 362                 m_freem(m);
 363                 return (ENETDOWN);
 364         }
 365
 366         /* BPF writes need to be handled specially. */
 367         if (dst->sa_family == AF_UNSPEC) {
 368                 bcopy(dst->sa_data, &af, sizeof(af));
 369                 dst->sa_family = af;
 370         }
 371
 372         /* Berkeley packet filter */
 373         ng_iface_bpftap(ifp, m, dst->sa_family);
 374
 375         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 376                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
 377                 if (m == NULL) {
 378                         IFQ_LOCK(&ifp->if_snd);
 379                         IFQ_INC_DROPS(&ifp->if_snd);
 380                         IFQ_UNLOCK(&ifp->if_snd);
 381                         ifp->if_oerrors++;
 382                         return (ENOBUFS);
 383                 }
 384                 *(sa_family_t *)m->m_data = dst->sa_family;
 385                 IFQ_HANDOFF(ifp, m, error);
 386         } else
 387                 error = ng_iface_send(ifp, m, dst->sa_family);
 388
 389         return (error);
 390 }
 391
 392 /*
 393  * Start method is used only when ALTQ is enabled.
 394  */
 395 static void
 396 ng_iface_start(struct ifnet *ifp)
 397 {
 398         struct mbuf *m;
 399         sa_family_t sa;
 400
 401         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 402
 403         for(;;) {
 404                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 405                 if (m == NULL)
 406                         break;
 407                 sa = *mtod(m, sa_family_t *);
 408                 m_adj(m, sizeof(sa_family_t));
 409                 ng_iface_send(ifp, m, sa);
 410         }
 411 }
 412
 413 /*
 414  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 415  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 416  */
 417 static void
 418 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 419 {
 420         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 421         if (bpf_peers_present(ifp->if_bpf)) {
 422                 int32_t family4 = (int32_t)family;
 423                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 424         }
 425 }
 426
 427 /*
 428  * This routine does actual delivery of the packet into the
 429  * netgraph(4). It is called from ng_iface_start() and
 430  * ng_iface_output().
 431  */
 432 static int
 433 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 434 {
 435         const priv_p priv = (priv_p) ifp->if_softc;
 436         const iffam_p iffam = get_iffam_from_af(sa);
 437         int error;
 438         int len;
 439
 440         /* Check address family to determine hook (if known) */
 441         if (iffam == NULL) {
 442                 m_freem(m);
 443                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 444                 return (EAFNOSUPPORT);
 445         }
 446
 447         /* Copy length before the mbuf gets invalidated. */
 448         len = m->m_pkthdr.len;
 449
 450         /* Send packet. If hook is not connected,
 451            mbuf will get freed. */
 452         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 453
 454         /* Update stats. */
 455         if (error == 0) {
 456                 ifp->if_obytes += len;
 457                 ifp->if_opackets++;
 458         }
 459
 460         return (error);
 461 }
 462
 463 #ifdef DEBUG
 464 /*
 465  * Display an ioctl to the virtual interface
 466  */
 467
 468 static void
 469 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 470 {
 471         char   *str;
 472
 473         switch (command & IOC_DIRMASK) {
 474         case IOC_VOID:
 475                 str = "IO";
 476                 break;
 477         case IOC_OUT:
 478                 str = "IOR";
 479                 break;
 480         case IOC_IN:
 481                 str = "IOW";
 482                 break;
 483         case IOC_INOUT:
 484                 str = "IORW";
 485                 break;
 486         default:
 487                 str = "IO??";
 488         }
 489         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 490                ifp->if_xname,
 491                str,
 492                IOCGROUP(command),
 493                command & 0xff,
 494                IOCPARM_LEN(command));
 495 }
 496 #endif /* DEBUG */
 497
 498 /************************************************************************
 499                         NETGRAPH NODE STUFF
 500  ************************************************************************/
 501
 502 /*
 503  * Constructor for a node
 504  */
 505 static int
 506 ng_iface_constructor(node_p node)
 507 {
 508         struct ifnet *ifp;
 509         priv_p priv;
 510
 511         /* Allocate node and interface private structures */
 512         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
 513         if (priv == NULL)
 514                 return (ENOMEM);
 515         ifp = if_alloc(IFT_PROPVIRTUAL);
 516         if (ifp == NULL) {
 517                 FREE(priv, M_NETGRAPH_IFACE);
 518                 return (ENOMEM);
 519         }
 520
 521         /* Link them together */
 522         ifp->if_softc = priv;
 523         priv->ifp = ifp;
 524
 525         /* Get an interface unit number */
 526         priv->unit = alloc_unr(ng_iface_unit);
 527
 528         /* Link together node and private info */
 529         NG_NODE_SET_PRIVATE(node, priv);
 530         priv->node = node;
 531
 532         /* Initialize interface structure */
 533         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 534         ifp->if_output = ng_iface_output;
 535         ifp->if_start = ng_iface_start;
 536         ifp->if_ioctl = ng_iface_ioctl;
 537         ifp->if_watchdog = NULL;
 538         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 539         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 540         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 541         ifp->if_addrlen = 0;                    /* XXX */
 542         ifp->if_hdrlen = 0;                     /* XXX */
 543         ifp->if_baudrate = 64000;               /* XXX */
 544         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
 545         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
 546         IFQ_SET_READY(&ifp->if_snd);
 547
 548         /* Give this node the same name as the interface (if possible) */
 549         if (ng_name_node(node, ifp->if_xname) != 0)
 550                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 551                     ifp->if_xname);
 552
 553         /* Attach the interface */
 554         if_attach(ifp);
 555         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 556
 557         /* Done */
 558         return (0);
 559 }
 560
 561 /*
 562  * Give our ok for a hook to be added
 563  */
 564 static int
 565 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 566 {
 567         const iffam_p iffam = get_iffam_from_name(name);
 568         hook_p *hookptr;
 569
 570         if (iffam == NULL)
 571                 return (EPFNOSUPPORT);
 572         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 573         if (*hookptr != NULL)
 574                 return (EISCONN);
 575         *hookptr = hook;
 576         NG_HOOK_HI_STACK(hook);
 577         return (0);
 578 }
 579
 580 /*
 581  * Receive a control message
 582  */
 583 static int
 584 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 585 {
 586         const priv_p priv = NG_NODE_PRIVATE(node);
 587         struct ifnet *const ifp = priv->ifp;
 588         struct ng_mesg *resp = NULL;
 589         int error = 0;
 590         struct ng_mesg *msg;
 591
 592         NGI_GET_MSG(item, msg);
 593         switch (msg->header.typecookie) {
 594         case NGM_IFACE_COOKIE:
 595                 switch (msg->header.cmd) {
 596                 case NGM_IFACE_GET_IFNAME:
 597                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 598                         if (resp == NULL) {
 599                                 error = ENOMEM;
 600                                 break;
 601                         }
 602                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 603                         break;
 604
 605                 case NGM_IFACE_POINT2POINT:
 606                 case NGM_IFACE_BROADCAST:
 607                     {
 608
 609                         /* Deny request if interface is UP */
 610                         if ((ifp->if_flags & IFF_UP) != 0)
 611                                 return (EBUSY);
 612
 613                         /* Change flags */
 614                         switch (msg->header.cmd) {
 615                         case NGM_IFACE_POINT2POINT:
 616                                 ifp->if_flags |= IFF_POINTOPOINT;
 617                                 ifp->if_flags &= ~IFF_BROADCAST;
 618                                 break;
 619                         case NGM_IFACE_BROADCAST:
 620                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 621                                 ifp->if_flags |= IFF_BROADCAST;
 622                                 break;
 623                         }
 624                         break;
 625                     }
 626
 627                 case NGM_IFACE_GET_IFINDEX:
 628                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 629                         if (resp == NULL) {
 630                                 error = ENOMEM;
 631                                 break;
 632                         }
 633                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 634                         break;
 635
 636                 default:
 637                         error = EINVAL;
 638                         break;
 639                 }
 640                 break;
 641         case NGM_CISCO_COOKIE:
 642                 switch (msg->header.cmd) {
 643                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 644                     {
 645                         struct ifaddr *ifa;
 646
 647                         /* Return the first configured IP address */
 648                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 649                                 struct ng_cisco_ipaddr *ips;
 650
 651                                 if (ifa->ifa_addr->sa_family != AF_INET)
 652                                         continue;
 653                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 654                                 if (resp == NULL) {
 655                                         error = ENOMEM;
 656                                         break;
 657                                 }
 658                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 659                                 ips->ipaddr = ((struct sockaddr_in *)
 660                                                 ifa->ifa_addr)->sin_addr;
 661                                 ips->netmask = ((struct sockaddr_in *)
 662                                                 ifa->ifa_netmask)->sin_addr;
 663                                 break;
 664                         }
 665
 666                         /* No IP addresses on this interface? */
 667                         if (ifa == NULL)
 668                                 error = EADDRNOTAVAIL;
 669                         break;
 670                     }
 671                 default:
 672                         error = EINVAL;
 673                         break;
 674                 }
 675                 break;
 676         case NGM_FLOW_COOKIE:
 677                 switch (msg->header.cmd) {
 678                 case NGM_LINK_IS_UP:
 679                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 680                         break;
 681                 case NGM_LINK_IS_DOWN:
 682                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 683                         break;
 684                 default:
 685                         break;
 686                 }
 687                 break;
 688         default:
 689                 error = EINVAL;
 690                 break;
 691         }
 692         NG_RESPOND_MSG(error, node, item, resp);
 693         NG_FREE_MSG(msg);
 694         return (error);
 695 }
 696
 697 /*
 698  * Recive data from a hook. Pass the packet to the correct input routine.
 699  */
 700 static int
 701 ng_iface_rcvdata(hook_p hook, item_p item)
 702 {
 703         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 704         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 705         struct ifnet *const ifp = priv->ifp;
 706         struct mbuf *m;
 707         int isr;
 708
 709         NGI_GET_M(item, m);
 710         NG_FREE_ITEM(item);
 711         /* Sanity checks */
 712         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 713         M_ASSERTPKTHDR(m);
 714         if ((ifp->if_flags & IFF_UP) == 0) {
 715                 NG_FREE_M(m);
 716                 return (ENETDOWN);
 717         }
 718
 719         /* Update interface stats */
 720         ifp->if_ipackets++;
 721         ifp->if_ibytes += m->m_pkthdr.len;
 722
 723         /* Note receiving interface */
 724         m->m_pkthdr.rcvif = ifp;
 725
 726         /* Berkeley packet filter */
 727         ng_iface_bpftap(ifp, m, iffam->family);
 728
 729         /* Send packet */
 730         switch (iffam->family) {
 731 #ifdef INET
 732         case AF_INET:
 733                 isr = NETISR_IP;
 734                 break;
 735 #endif
 736 #ifdef INET6
 737         case AF_INET6:
 738                 isr = NETISR_IPV6;
 739                 break;
 740 #endif
 741 #ifdef IPX
 742         case AF_IPX:
 743                 isr = NETISR_IPX;
 744                 break;
 745 #endif
 746 #ifdef NETATALK
 747         case AF_APPLETALK:
 748                 isr = NETISR_ATALK2;
 749                 break;
 750 #endif
 751         default:
 752                 m_freem(m);
 753                 return (EAFNOSUPPORT);
 754         }
 755         /* First chunk of an mbuf contains good junk */
 756         if (harvest.point_to_point)
 757                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 758         netisr_dispatch(isr, m);
 759         return (0);
 760 }
 761
 762 /*
 763  * Shutdown and remove the node and its associated interface.
 764  */
 765 static int
 766 ng_iface_shutdown(node_p node)
 767 {
 768         const priv_p priv = NG_NODE_PRIVATE(node);
 769
 770         bpfdetach(priv->ifp);
 771         if_detach(priv->ifp);
 772         if_free(priv->ifp);
 773         priv->ifp = NULL;
 774         free_unr(ng_iface_unit, priv->unit);
 775         FREE(priv, M_NETGRAPH_IFACE);
 776         NG_NODE_SET_PRIVATE(node, NULL);
 777         NG_NODE_UNREF(node);
 778         return (0);
 779 }
 780
 781 /*
 782  * Hook disconnection. Note that we do *not* shutdown when all
 783  * hooks have been disconnected.
 784  */
 785 static int
 786 ng_iface_disconnect(hook_p hook)
 787 {
 788         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 789         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 790
 791         if (iffam == NULL)
 792                 panic(__func__);
 793         *get_hook_from_iffam(priv, iffam) = NULL;
 794         return (0);
 795 }
 796
 797 /*
 798  * Handle loading and unloading for this node type.
 799  */
 800 static int
 801 ng_iface_mod_event(module_t mod, int event, void *data)
 802 {
 803         int error = 0;
 804
 805         switch (event) {
 806         case MOD_LOAD:
 807                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 808                 break;
 809         case MOD_UNLOAD:
 810                 delete_unrhdr(ng_iface_unit);
 811                 break;
 812         default:
 813                 error = EOPNOTSUPP;
 814                 break;
 815         }
 816         return (error);
 817 }