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, 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 #ifdef DEBUG
 127 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 128 #endif
 129
 130 /* Netgraph methods */
 131 static int              ng_iface_mod_event(module_t, int, void *);
 132 static ng_constructor_t ng_iface_constructor;
 133 static ng_rcvmsg_t      ng_iface_rcvmsg;
 134 static ng_shutdown_t    ng_iface_shutdown;
 135 static ng_newhook_t     ng_iface_newhook;
 136 static ng_rcvdata_t     ng_iface_rcvdata;
 137 static ng_disconnect_t  ng_iface_disconnect;
 138
 139 /* Helper stuff */
 140 static iffam_p  get_iffam_from_af(sa_family_t family);
 141 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 142 static iffam_p  get_iffam_from_name(const char *name);
 143 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 144
 145 /* Parse type for struct ng_cisco_ipaddr */
 146 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 147         = NG_CISCO_IPADDR_TYPE_INFO;
 148 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 149         &ng_parse_struct_type,
 150         &ng_cisco_ipaddr_type_fields
 151 };
 152
 153 /* List of commands and how to convert arguments to/from ASCII */
 154 static const struct ng_cmdlist ng_iface_cmds[] = {
 155         {
 156           NGM_IFACE_COOKIE,
 157           NGM_IFACE_GET_IFNAME,
 158           "getifname",
 159           NULL,
 160           &ng_parse_string_type
 161         },
 162         {
 163           NGM_IFACE_COOKIE,
 164           NGM_IFACE_POINT2POINT,
 165           "point2point",
 166           NULL,
 167           NULL
 168         },
 169         {
 170           NGM_IFACE_COOKIE,
 171           NGM_IFACE_BROADCAST,
 172           "broadcast",
 173           NULL,
 174           NULL
 175         },
 176         {
 177           NGM_CISCO_COOKIE,
 178           NGM_CISCO_GET_IPADDR,
 179           "getipaddr",
 180           NULL,
 181           &ng_cisco_ipaddr_type
 182         },
 183         {
 184           NGM_IFACE_COOKIE,
 185           NGM_IFACE_GET_IFINDEX,
 186           "getifindex",
 187           NULL,
 188           &ng_parse_uint32_type
 189         },
 190         { 0 }
 191 };
 192
 193 /* Node type descriptor */
 194 static struct ng_type typestruct = {
 195         .version =      NG_ABI_VERSION,
 196         .name =         NG_IFACE_NODE_TYPE,
 197         .mod_event =    ng_iface_mod_event,
 198         .constructor =  ng_iface_constructor,
 199         .rcvmsg =       ng_iface_rcvmsg,
 200         .shutdown =     ng_iface_shutdown,
 201         .newhook =      ng_iface_newhook,
 202         .rcvdata =      ng_iface_rcvdata,
 203         .disconnect =   ng_iface_disconnect,
 204         .cmdlist =      ng_iface_cmds,
 205 };
 206 NETGRAPH_INIT(iface, &typestruct);
 207
 208 static struct unrhdr    *ng_iface_unit;
 209
 210 /************************************************************************
 211                         HELPER STUFF
 212  ************************************************************************/
 213
 214 /*
 215  * Get the family descriptor from the family ID
 216  */
 217 static __inline iffam_p
 218 get_iffam_from_af(sa_family_t family)
 219 {
 220         iffam_p iffam;
 221         int k;
 222
 223         for (k = 0; k < NUM_FAMILIES; k++) {
 224                 iffam = &gFamilies[k];
 225                 if (iffam->family == family)
 226                         return (iffam);
 227         }
 228         return (NULL);
 229 }
 230
 231 /*
 232  * Get the family descriptor from the hook
 233  */
 234 static __inline iffam_p
 235 get_iffam_from_hook(priv_p priv, hook_p hook)
 236 {
 237         int k;
 238
 239         for (k = 0; k < NUM_FAMILIES; k++)
 240                 if (priv->hooks[k] == hook)
 241                         return (&gFamilies[k]);
 242         return (NULL);
 243 }
 244
 245 /*
 246  * Get the hook from the iffam descriptor
 247  */
 248
 249 static __inline hook_p *
 250 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 251 {
 252         return (&priv->hooks[iffam - gFamilies]);
 253 }
 254
 255 /*
 256  * Get the iffam descriptor from the name
 257  */
 258 static __inline iffam_p
 259 get_iffam_from_name(const char *name)
 260 {
 261         iffam_p iffam;
 262         int k;
 263
 264         for (k = 0; k < NUM_FAMILIES; k++) {
 265                 iffam = &gFamilies[k];
 266                 if (!strcmp(iffam->hookname, name))
 267                         return (iffam);
 268         }
 269         return (NULL);
 270 }
 271
 272 /************************************************************************
 273                         INTERFACE STUFF
 274  ************************************************************************/
 275
 276 /*
 277  * Process an ioctl for the virtual interface
 278  */
 279 static int
 280 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 281 {
 282         struct ifreq *const ifr = (struct ifreq *) data;
 283         int s, error = 0;
 284
 285 #ifdef DEBUG
 286         ng_iface_print_ioctl(ifp, command, data);
 287 #endif
 288         s = splimp();
 289         switch (command) {
 290
 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         (void) splx(s);
 341         return (error);
 342 }
 343
 344 /*
 345  * This routine is called to deliver a packet out the interface.
 346  * We simply look at the address family and relay the packet to
 347  * the corresponding hook, if it exists and is connected.
 348  */
 349
 350 static int
 351 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 352                 struct sockaddr *dst, struct rtentry *rt0)
 353 {
 354         const priv_p priv = (priv_p) ifp->if_softc;
 355         const iffam_p iffam = get_iffam_from_af(dst->sa_family);
 356         int len, error = 0;
 357         u_int32_t af;
 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         /* Check address family to determine hook (if known) */
 376         if (iffam == NULL) {
 377                 m_freem(m);
 378                 log(LOG_WARNING, "%s: can't handle af%d\n",
 379                        ifp->if_xname, (int)dst->sa_family);
 380                 return (EAFNOSUPPORT);
 381         }
 382
 383         /* Copy length before the mbuf gets invalidated */
 384         len = m->m_pkthdr.len;
 385
 386         /* Send packet; if hook is not connected, mbuf will get freed. */
 387         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 388
 389         /* Update stats */
 390         if (error == 0) {
 391                 ifp->if_obytes += len;
 392                 ifp->if_opackets++;
 393         }
 394         return (error);
 395 }
 396
 397 /*
 398  * This routine should never be called
 399  */
 400
 401 static void
 402 ng_iface_start(struct ifnet *ifp)
 403 {
 404         if_printf(ifp, "%s called?", __func__);
 405 }
 406
 407 /*
 408  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 409  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 410  */
 411 static void
 412 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 413 {
 414         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 415         if (ifp->if_bpf != NULL) {
 416                 int32_t family4 = (int32_t)family;
 417                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 418         }
 419 }
 420
 421 #ifdef DEBUG
 422 /*
 423  * Display an ioctl to the virtual interface
 424  */
 425
 426 static void
 427 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 428 {
 429         char   *str;
 430
 431         switch (command & IOC_DIRMASK) {
 432         case IOC_VOID:
 433                 str = "IO";
 434                 break;
 435         case IOC_OUT:
 436                 str = "IOR";
 437                 break;
 438         case IOC_IN:
 439                 str = "IOW";
 440                 break;
 441         case IOC_INOUT:
 442                 str = "IORW";
 443                 break;
 444         default:
 445                 str = "IO??";
 446         }
 447         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 448                ifp->if_xname,
 449                str,
 450                IOCGROUP(command),
 451                command & 0xff,
 452                IOCPARM_LEN(command));
 453 }
 454 #endif /* DEBUG */
 455
 456 /************************************************************************
 457                         NETGRAPH NODE STUFF
 458  ************************************************************************/
 459
 460 /*
 461  * Constructor for a node
 462  */
 463 static int
 464 ng_iface_constructor(node_p node)
 465 {
 466         struct ifnet *ifp;
 467         priv_p priv;
 468
 469         /* Allocate node and interface private structures */
 470         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
 471         if (priv == NULL)
 472                 return (ENOMEM);
 473         ifp = if_alloc(IFT_PROPVIRTUAL);
 474         if (ifp == NULL) {
 475                 FREE(priv, M_NETGRAPH_IFACE);
 476                 return (ENOMEM);
 477         }
 478
 479         /* Link them together */
 480         ifp->if_softc = priv;
 481         priv->ifp = ifp;
 482
 483         /* Get an interface unit number */
 484         priv->unit = alloc_unr(ng_iface_unit);
 485
 486         /* Link together node and private info */
 487         NG_NODE_SET_PRIVATE(node, priv);
 488         priv->node = node;
 489
 490         /* Initialize interface structure */
 491         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 492         ifp->if_output = ng_iface_output;
 493         ifp->if_start = ng_iface_start;
 494         ifp->if_ioctl = ng_iface_ioctl;
 495         ifp->if_watchdog = NULL;
 496         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 497         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 498         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 499         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 500         ifp->if_addrlen = 0;                    /* XXX */
 501         ifp->if_hdrlen = 0;                     /* XXX */
 502         ifp->if_baudrate = 64000;               /* XXX */
 503
 504         /* Give this node the same name as the interface (if possible) */
 505         if (ng_name_node(node, ifp->if_xname) != 0)
 506                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 507                     ifp->if_xname);
 508
 509         /* Attach the interface */
 510         if_attach(ifp);
 511         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 512
 513         /* Done */
 514         return (0);
 515 }
 516
 517 /*
 518  * Give our ok for a hook to be added
 519  */
 520 static int
 521 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 522 {
 523         const iffam_p iffam = get_iffam_from_name(name);
 524         hook_p *hookptr;
 525
 526         if (iffam == NULL)
 527                 return (EPFNOSUPPORT);
 528         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 529         if (*hookptr != NULL)
 530                 return (EISCONN);
 531         *hookptr = hook;
 532         return (0);
 533 }
 534
 535 /*
 536  * Receive a control message
 537  */
 538 static int
 539 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 540 {
 541         const priv_p priv = NG_NODE_PRIVATE(node);
 542         struct ifnet *const ifp = priv->ifp;
 543         struct ng_mesg *resp = NULL;
 544         int error = 0;
 545         struct ng_mesg *msg;
 546
 547         NGI_GET_MSG(item, msg);
 548         switch (msg->header.typecookie) {
 549         case NGM_IFACE_COOKIE:
 550                 switch (msg->header.cmd) {
 551                 case NGM_IFACE_GET_IFNAME:
 552                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 553                         if (resp == NULL) {
 554                                 error = ENOMEM;
 555                                 break;
 556                         }
 557                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 558                         break;
 559
 560                 case NGM_IFACE_POINT2POINT:
 561                 case NGM_IFACE_BROADCAST:
 562                     {
 563
 564                         /* Deny request if interface is UP */
 565                         if ((ifp->if_flags & IFF_UP) != 0)
 566                                 return (EBUSY);
 567
 568                         /* Change flags */
 569                         switch (msg->header.cmd) {
 570                         case NGM_IFACE_POINT2POINT:
 571                                 ifp->if_flags |= IFF_POINTOPOINT;
 572                                 ifp->if_flags &= ~IFF_BROADCAST;
 573                                 break;
 574                         case NGM_IFACE_BROADCAST:
 575                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 576                                 ifp->if_flags |= IFF_BROADCAST;
 577                                 break;
 578                         }
 579                         break;
 580                     }
 581
 582                 case NGM_IFACE_GET_IFINDEX:
 583                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 584                         if (resp == NULL) {
 585                                 error = ENOMEM;
 586                                 break;
 587                         }
 588                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 589                         break;
 590
 591                 default:
 592                         error = EINVAL;
 593                         break;
 594                 }
 595                 break;
 596         case NGM_CISCO_COOKIE:
 597                 switch (msg->header.cmd) {
 598                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 599                     {
 600                         struct ifaddr *ifa;
 601
 602                         /* Return the first configured IP address */
 603                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 604                                 struct ng_cisco_ipaddr *ips;
 605
 606                                 if (ifa->ifa_addr->sa_family != AF_INET)
 607                                         continue;
 608                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 609                                 if (resp == NULL) {
 610                                         error = ENOMEM;
 611                                         break;
 612                                 }
 613                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 614                                 ips->ipaddr = ((struct sockaddr_in *)
 615                                                 ifa->ifa_addr)->sin_addr;
 616                                 ips->netmask = ((struct sockaddr_in *)
 617                                                 ifa->ifa_netmask)->sin_addr;
 618                                 break;
 619                         }
 620
 621                         /* No IP addresses on this interface? */
 622                         if (ifa == NULL)
 623                                 error = EADDRNOTAVAIL;
 624                         break;
 625                     }
 626                 default:
 627                         error = EINVAL;
 628                         break;
 629                 }
 630                 break;
 631         case NGM_FLOW_COOKIE:
 632                 switch (msg->header.cmd) {
 633                 case NGM_LINK_IS_UP:
 634                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 635                         break;
 636                 case NGM_LINK_IS_DOWN:
 637                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 638                         break;
 639                 default:
 640                         break;
 641                 }
 642                 break;
 643         default:
 644                 error = EINVAL;
 645                 break;
 646         }
 647         NG_RESPOND_MSG(error, node, item, resp);
 648         NG_FREE_MSG(msg);
 649         return (error);
 650 }
 651
 652 /*
 653  * Recive data from a hook. Pass the packet to the correct input routine.
 654  */
 655 static int
 656 ng_iface_rcvdata(hook_p hook, item_p item)
 657 {
 658         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 659         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 660         struct ifnet *const ifp = priv->ifp;
 661         struct mbuf *m;
 662         int isr;
 663
 664         NGI_GET_M(item, m);
 665         NG_FREE_ITEM(item);
 666         /* Sanity checks */
 667         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 668         M_ASSERTPKTHDR(m);
 669         if ((ifp->if_flags & IFF_UP) == 0) {
 670                 NG_FREE_M(m);
 671                 return (ENETDOWN);
 672         }
 673
 674         /* Update interface stats */
 675         ifp->if_ipackets++;
 676         ifp->if_ibytes += m->m_pkthdr.len;
 677
 678         /* Note receiving interface */
 679         m->m_pkthdr.rcvif = ifp;
 680
 681         /* Berkeley packet filter */
 682         ng_iface_bpftap(ifp, m, iffam->family);
 683
 684         /* Send packet */
 685         switch (iffam->family) {
 686 #ifdef INET
 687         case AF_INET:
 688                 isr = NETISR_IP;
 689                 break;
 690 #endif
 691 #ifdef INET6
 692         case AF_INET6:
 693                 isr = NETISR_IPV6;
 694                 break;
 695 #endif
 696 #ifdef IPX
 697         case AF_IPX:
 698                 isr = NETISR_IPX;
 699                 break;
 700 #endif
 701 #ifdef NETATALK
 702         case AF_APPLETALK:
 703                 isr = NETISR_ATALK2;
 704                 break;
 705 #endif
 706         default:
 707                 m_freem(m);
 708                 return (EAFNOSUPPORT);
 709         }
 710         /* First chunk of an mbuf contains good junk */
 711         if (harvest.point_to_point)
 712                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 713         netisr_dispatch(isr, m);
 714         return (0);
 715 }
 716
 717 /*
 718  * Shutdown and remove the node and its associated interface.
 719  */
 720 static int
 721 ng_iface_shutdown(node_p node)
 722 {
 723         const priv_p priv = NG_NODE_PRIVATE(node);
 724
 725         bpfdetach(priv->ifp);
 726         if_detach(priv->ifp);
 727         if_free(priv->ifp);
 728         priv->ifp = NULL;
 729         free_unr(ng_iface_unit, priv->unit);
 730         FREE(priv, M_NETGRAPH_IFACE);
 731         NG_NODE_SET_PRIVATE(node, NULL);
 732         NG_NODE_UNREF(node);
 733         return (0);
 734 }
 735
 736 /*
 737  * Hook disconnection. Note that we do *not* shutdown when all
 738  * hooks have been disconnected.
 739  */
 740 static int
 741 ng_iface_disconnect(hook_p hook)
 742 {
 743         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 744         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 745
 746         if (iffam == NULL)
 747                 panic(__func__);
 748         *get_hook_from_iffam(priv, iffam) = NULL;
 749         return (0);
 750 }
 751
 752 /*
 753  * Handle loading and unloading for this node type.
 754  */
 755 static int
 756 ng_iface_mod_event(module_t mod, int event, void *data)
 757 {
 758         int error = 0;
 759
 760         switch (event) {
 761         case MOD_LOAD:
 762                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 763                 break;
 764         case MOD_UNLOAD:
 765                 delete_unrhdr(ng_iface_unit);
 766                 break;
 767         default:
 768                 error = EOPNOTSUPP;
 769                 break;
 770         }
 771         return (error);
 772 }