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 #include <sys/vimage.h>
  73
  74 #include <net/if.h>
  75 #include <net/if_types.h>
  76 #include <net/bpf.h>
  77 #include <net/netisr.h>
  78
  79 #include <netinet/in.h>
  80
  81 #include <netgraph/ng_message.h>
  82 #include <netgraph/netgraph.h>
  83 #include <netgraph/ng_parse.h>
  84 #include <netgraph/ng_iface.h>
  85 #include <netgraph/ng_cisco.h>
  86
  87 #ifdef NG_SEPARATE_MALLOC
  88 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
  89 #else
  90 #define M_NETGRAPH_IFACE M_NETGRAPH
  91 #endif
  92
  93 /* This struct describes one address family */
  94 struct iffam {
  95         sa_family_t     family;         /* Address family */
  96         const char      *hookname;      /* Name for hook */
  97 };
  98 typedef const struct iffam *iffam_p;
  99
 100 /* List of address families supported by our interface */
 101 const static struct iffam gFamilies[] = {
 102         { AF_INET,      NG_IFACE_HOOK_INET      },
 103         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 104         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
 105         { AF_IPX,       NG_IFACE_HOOK_IPX       },
 106         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 107         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 108 };
 109 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*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 };
 118 typedef struct ng_iface_private *priv_p;
 119
 120 /* Interface methods */
 121 static void     ng_iface_start(struct ifnet *ifp);
 122 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 123 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 124                         struct sockaddr *dst, struct rtentry *rt0);
 125 static void     ng_iface_bpftap(struct ifnet *ifp,
 126                         struct mbuf *m, sa_family_t family);
 127 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 128                         sa_family_t sa);
 129 #ifdef DEBUG
 130 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 131 #endif
 132
 133 /* Netgraph methods */
 134 static int              ng_iface_mod_event(module_t, int, void *);
 135 static ng_constructor_t ng_iface_constructor;
 136 static ng_rcvmsg_t      ng_iface_rcvmsg;
 137 static ng_shutdown_t    ng_iface_shutdown;
 138 static ng_newhook_t     ng_iface_newhook;
 139 static ng_rcvdata_t     ng_iface_rcvdata;
 140 static ng_disconnect_t  ng_iface_disconnect;
 141
 142 /* Helper stuff */
 143 static iffam_p  get_iffam_from_af(sa_family_t family);
 144 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 145 static iffam_p  get_iffam_from_name(const char *name);
 146 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 147
 148 /* Parse type for struct ng_cisco_ipaddr */
 149 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 150         = NG_CISCO_IPADDR_TYPE_INFO;
 151 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 152         &ng_parse_struct_type,
 153         &ng_cisco_ipaddr_type_fields
 154 };
 155
 156 /* List of commands and how to convert arguments to/from ASCII */
 157 static const struct ng_cmdlist ng_iface_cmds[] = {
 158         {
 159           NGM_IFACE_COOKIE,
 160           NGM_IFACE_GET_IFNAME,
 161           "getifname",
 162           NULL,
 163           &ng_parse_string_type
 164         },
 165         {
 166           NGM_IFACE_COOKIE,
 167           NGM_IFACE_POINT2POINT,
 168           "point2point",
 169           NULL,
 170           NULL
 171         },
 172         {
 173           NGM_IFACE_COOKIE,
 174           NGM_IFACE_BROADCAST,
 175           "broadcast",
 176           NULL,
 177           NULL
 178         },
 179         {
 180           NGM_CISCO_COOKIE,
 181           NGM_CISCO_GET_IPADDR,
 182           "getipaddr",
 183           NULL,
 184           &ng_cisco_ipaddr_type
 185         },
 186         {
 187           NGM_IFACE_COOKIE,
 188           NGM_IFACE_GET_IFINDEX,
 189           "getifindex",
 190           NULL,
 191           &ng_parse_uint32_type
 192         },
 193         { 0 }
 194 };
 195
 196 /* Node type descriptor */
 197 static struct ng_type typestruct = {
 198         .version =      NG_ABI_VERSION,
 199         .name =         NG_IFACE_NODE_TYPE,
 200         .mod_event =    ng_iface_mod_event,
 201         .constructor =  ng_iface_constructor,
 202         .rcvmsg =       ng_iface_rcvmsg,
 203         .shutdown =     ng_iface_shutdown,
 204         .newhook =      ng_iface_newhook,
 205         .rcvdata =      ng_iface_rcvdata,
 206         .disconnect =   ng_iface_disconnect,
 207         .cmdlist =      ng_iface_cmds,
 208 };
 209 NETGRAPH_INIT(iface, &typestruct);
 210
 211 #ifdef VIMAGE_GLOBALS
 212 static struct unrhdr    *ng_iface_unit;
 213 #endif
 214
 215 /************************************************************************
 216                         HELPER STUFF
 217  ************************************************************************/
 218
 219 /*
 220  * Get the family descriptor from the family ID
 221  */
 222 static __inline iffam_p
 223 get_iffam_from_af(sa_family_t family)
 224 {
 225         iffam_p iffam;
 226         int k;
 227
 228         for (k = 0; k < NUM_FAMILIES; k++) {
 229                 iffam = &gFamilies[k];
 230                 if (iffam->family == family)
 231                         return (iffam);
 232         }
 233         return (NULL);
 234 }
 235
 236 /*
 237  * Get the family descriptor from the hook
 238  */
 239 static __inline iffam_p
 240 get_iffam_from_hook(priv_p priv, hook_p hook)
 241 {
 242         int k;
 243
 244         for (k = 0; k < NUM_FAMILIES; k++)
 245                 if (priv->hooks[k] == hook)
 246                         return (&gFamilies[k]);
 247         return (NULL);
 248 }
 249
 250 /*
 251  * Get the hook from the iffam descriptor
 252  */
 253
 254 static __inline hook_p *
 255 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 256 {
 257         return (&priv->hooks[iffam - gFamilies]);
 258 }
 259
 260 /*
 261  * Get the iffam descriptor from the name
 262  */
 263 static __inline iffam_p
 264 get_iffam_from_name(const char *name)
 265 {
 266         iffam_p iffam;
 267         int k;
 268
 269         for (k = 0; k < NUM_FAMILIES; k++) {
 270                 iffam = &gFamilies[k];
 271                 if (!strcmp(iffam->hookname, name))
 272                         return (iffam);
 273         }
 274         return (NULL);
 275 }
 276
 277 /************************************************************************
 278                         INTERFACE STUFF
 279  ************************************************************************/
 280
 281 /*
 282  * Process an ioctl for the virtual interface
 283  */
 284 static int
 285 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 286 {
 287         struct ifreq *const ifr = (struct ifreq *) data;
 288         int s, error = 0;
 289
 290 #ifdef DEBUG
 291         ng_iface_print_ioctl(ifp, command, data);
 292 #endif
 293         s = splimp();
 294         switch (command) {
 295
 296         /* These two are mostly handled at a higher layer */
 297         case SIOCSIFADDR:
 298                 ifp->if_flags |= IFF_UP;
 299                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 300                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 301                 break;
 302         case SIOCGIFADDR:
 303                 break;
 304
 305         /* Set flags */
 306         case SIOCSIFFLAGS:
 307                 /*
 308                  * If the interface is marked up and stopped, then start it.
 309                  * If it is marked down and running, then stop it.
 310                  */
 311                 if (ifr->ifr_flags & IFF_UP) {
 312                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 313                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 314                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 315                         }
 316                 } else {
 317                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 318                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 319                                     IFF_DRV_OACTIVE);
 320                 }
 321                 break;
 322
 323         /* Set the interface MTU */
 324         case SIOCSIFMTU:
 325                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 326                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 327                         error = EINVAL;
 328                 else
 329                         ifp->if_mtu = ifr->ifr_mtu;
 330                 break;
 331
 332         /* Stuff that's not supported */
 333         case SIOCADDMULTI:
 334         case SIOCDELMULTI:
 335                 error = 0;
 336                 break;
 337         case SIOCSIFPHYS:
 338                 error = EOPNOTSUPP;
 339                 break;
 340
 341         default:
 342                 error = EINVAL;
 343                 break;
 344         }
 345         (void) splx(s);
 346         return (error);
 347 }
 348
 349 /*
 350  * This routine is called to deliver a packet out the interface.
 351  * We simply look at the address family and relay the packet to
 352  * the corresponding hook, if it exists and is connected.
 353  */
 354
 355 static int
 356 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 357                 struct sockaddr *dst, struct rtentry *rt0)
 358 {
 359         uint32_t af;
 360         int error;
 361
 362         /* Check interface flags */
 363         if (!((ifp->if_flags & IFF_UP) &&
 364             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 365                 m_freem(m);
 366                 return (ENETDOWN);
 367         }
 368
 369         /* BPF writes need to be handled specially. */
 370         if (dst->sa_family == AF_UNSPEC) {
 371                 bcopy(dst->sa_data, &af, sizeof(af));
 372                 dst->sa_family = af;
 373         }
 374
 375         /* Berkeley packet filter */
 376         ng_iface_bpftap(ifp, m, dst->sa_family);
 377
 378         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 379                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
 380                 if (m == NULL) {
 381                         IFQ_LOCK(&ifp->if_snd);
 382                         IFQ_INC_DROPS(&ifp->if_snd);
 383                         IFQ_UNLOCK(&ifp->if_snd);
 384                         ifp->if_oerrors++;
 385                         return (ENOBUFS);
 386                 }
 387                 *(sa_family_t *)m->m_data = dst->sa_family;
 388                 error = (ifp->if_transmit)(ifp, m);
 389         } else
 390                 error = ng_iface_send(ifp, m, dst->sa_family);
 391
 392         return (error);
 393 }
 394
 395 /*
 396  * Start method is used only when ALTQ is enabled.
 397  */
 398 static void
 399 ng_iface_start(struct ifnet *ifp)
 400 {
 401         struct mbuf *m;
 402         sa_family_t sa;
 403
 404         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 405
 406         for(;;) {
 407                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 408                 if (m == NULL)
 409                         break;
 410                 sa = *mtod(m, sa_family_t *);
 411                 m_adj(m, sizeof(sa_family_t));
 412                 ng_iface_send(ifp, m, sa);
 413         }
 414 }
 415
 416 /*
 417  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 418  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 419  */
 420 static void
 421 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 422 {
 423         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 424         if (bpf_peers_present(ifp->if_bpf)) {
 425                 int32_t family4 = (int32_t)family;
 426                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 427         }
 428 }
 429
 430 /*
 431  * This routine does actual delivery of the packet into the
 432  * netgraph(4). It is called from ng_iface_start() and
 433  * ng_iface_output().
 434  */
 435 static int
 436 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 437 {
 438         const priv_p priv = (priv_p) ifp->if_softc;
 439         const iffam_p iffam = get_iffam_from_af(sa);
 440         int error;
 441         int len;
 442
 443         /* Check address family to determine hook (if known) */
 444         if (iffam == NULL) {
 445                 m_freem(m);
 446                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 447                 return (EAFNOSUPPORT);
 448         }
 449
 450         /* Copy length before the mbuf gets invalidated. */
 451         len = m->m_pkthdr.len;
 452
 453         /* Send packet. If hook is not connected,
 454            mbuf will get freed. */
 455         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 456
 457         /* Update stats. */
 458         if (error == 0) {
 459                 ifp->if_obytes += len;
 460                 ifp->if_opackets++;
 461         }
 462
 463         return (error);
 464 }
 465
 466 #ifdef DEBUG
 467 /*
 468  * Display an ioctl to the virtual interface
 469  */
 470
 471 static void
 472 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 473 {
 474         char   *str;
 475
 476         switch (command & IOC_DIRMASK) {
 477         case IOC_VOID:
 478                 str = "IO";
 479                 break;
 480         case IOC_OUT:
 481                 str = "IOR";
 482                 break;
 483         case IOC_IN:
 484                 str = "IOW";
 485                 break;
 486         case IOC_INOUT:
 487                 str = "IORW";
 488                 break;
 489         default:
 490                 str = "IO??";
 491         }
 492         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 493                ifp->if_xname,
 494                str,
 495                IOCGROUP(command),
 496                command & 0xff,
 497                IOCPARM_LEN(command));
 498 }
 499 #endif /* DEBUG */
 500
 501 /************************************************************************
 502                         NETGRAPH NODE STUFF
 503  ************************************************************************/
 504
 505 /*
 506  * Constructor for a node
 507  */
 508 static int
 509 ng_iface_constructor(node_p node)
 510 {
 511         INIT_VNET_NETGRAPH(curvnet);
 512         struct ifnet *ifp;
 513         priv_p priv;
 514
 515         /* Allocate node and interface private structures */
 516         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
 517         if (priv == NULL)
 518                 return (ENOMEM);
 519         ifp = if_alloc(IFT_PROPVIRTUAL);
 520         if (ifp == NULL) {
 521                 free(priv, M_NETGRAPH_IFACE);
 522                 return (ENOMEM);
 523         }
 524
 525         /* Link them together */
 526         ifp->if_softc = priv;
 527         priv->ifp = ifp;
 528
 529         /* Get an interface unit number */
 530         priv->unit = alloc_unr(V_ng_iface_unit);
 531
 532         /* Link together node and private info */
 533         NG_NODE_SET_PRIVATE(node, priv);
 534         priv->node = node;
 535
 536         /* Initialize interface structure */
 537         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 538         ifp->if_output = ng_iface_output;
 539         ifp->if_start = ng_iface_start;
 540         ifp->if_ioctl = ng_iface_ioctl;
 541         ifp->if_watchdog = NULL;
 542         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 543         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 544         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 545         ifp->if_addrlen = 0;                    /* XXX */
 546         ifp->if_hdrlen = 0;                     /* XXX */
 547         ifp->if_baudrate = 64000;               /* XXX */
 548         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
 549         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
 550         IFQ_SET_READY(&ifp->if_snd);
 551
 552         /* Give this node the same name as the interface (if possible) */
 553         if (ng_name_node(node, ifp->if_xname) != 0)
 554                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 555                     ifp->if_xname);
 556
 557         /* Attach the interface */
 558         if_attach(ifp);
 559         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 560
 561         /* Done */
 562         return (0);
 563 }
 564
 565 /*
 566  * Give our ok for a hook to be added
 567  */
 568 static int
 569 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 570 {
 571         const iffam_p iffam = get_iffam_from_name(name);
 572         hook_p *hookptr;
 573
 574         if (iffam == NULL)
 575                 return (EPFNOSUPPORT);
 576         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 577         if (*hookptr != NULL)
 578                 return (EISCONN);
 579         *hookptr = hook;
 580         NG_HOOK_HI_STACK(hook);
 581         return (0);
 582 }
 583
 584 /*
 585  * Receive a control message
 586  */
 587 static int
 588 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 589 {
 590         const priv_p priv = NG_NODE_PRIVATE(node);
 591         struct ifnet *const ifp = priv->ifp;
 592         struct ng_mesg *resp = NULL;
 593         int error = 0;
 594         struct ng_mesg *msg;
 595
 596         NGI_GET_MSG(item, msg);
 597         switch (msg->header.typecookie) {
 598         case NGM_IFACE_COOKIE:
 599                 switch (msg->header.cmd) {
 600                 case NGM_IFACE_GET_IFNAME:
 601                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 602                         if (resp == NULL) {
 603                                 error = ENOMEM;
 604                                 break;
 605                         }
 606                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 607                         break;
 608
 609                 case NGM_IFACE_POINT2POINT:
 610                 case NGM_IFACE_BROADCAST:
 611                     {
 612
 613                         /* Deny request if interface is UP */
 614                         if ((ifp->if_flags & IFF_UP) != 0)
 615                                 return (EBUSY);
 616
 617                         /* Change flags */
 618                         switch (msg->header.cmd) {
 619                         case NGM_IFACE_POINT2POINT:
 620                                 ifp->if_flags |= IFF_POINTOPOINT;
 621                                 ifp->if_flags &= ~IFF_BROADCAST;
 622                                 break;
 623                         case NGM_IFACE_BROADCAST:
 624                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 625                                 ifp->if_flags |= IFF_BROADCAST;
 626                                 break;
 627                         }
 628                         break;
 629                     }
 630
 631                 case NGM_IFACE_GET_IFINDEX:
 632                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 633                         if (resp == NULL) {
 634                                 error = ENOMEM;
 635                                 break;
 636                         }
 637                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 638                         break;
 639
 640                 default:
 641                         error = EINVAL;
 642                         break;
 643                 }
 644                 break;
 645         case NGM_CISCO_COOKIE:
 646                 switch (msg->header.cmd) {
 647                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 648                     {
 649                         struct ifaddr *ifa;
 650
 651                         /* Return the first configured IP address */
 652                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 653                                 struct ng_cisco_ipaddr *ips;
 654
 655                                 if (ifa->ifa_addr->sa_family != AF_INET)
 656                                         continue;
 657                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 658                                 if (resp == NULL) {
 659                                         error = ENOMEM;
 660                                         break;
 661                                 }
 662                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 663                                 ips->ipaddr = ((struct sockaddr_in *)
 664                                                 ifa->ifa_addr)->sin_addr;
 665                                 ips->netmask = ((struct sockaddr_in *)
 666                                                 ifa->ifa_netmask)->sin_addr;
 667                                 break;
 668                         }
 669
 670                         /* No IP addresses on this interface? */
 671                         if (ifa == NULL)
 672                                 error = EADDRNOTAVAIL;
 673                         break;
 674                     }
 675                 default:
 676                         error = EINVAL;
 677                         break;
 678                 }
 679                 break;
 680         case NGM_FLOW_COOKIE:
 681                 switch (msg->header.cmd) {
 682                 case NGM_LINK_IS_UP:
 683                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 684                         break;
 685                 case NGM_LINK_IS_DOWN:
 686                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 687                         break;
 688                 default:
 689                         break;
 690                 }
 691                 break;
 692         default:
 693                 error = EINVAL;
 694                 break;
 695         }
 696         NG_RESPOND_MSG(error, node, item, resp);
 697         NG_FREE_MSG(msg);
 698         return (error);
 699 }
 700
 701 /*
 702  * Recive data from a hook. Pass the packet to the correct input routine.
 703  */
 704 static int
 705 ng_iface_rcvdata(hook_p hook, item_p item)
 706 {
 707         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 708         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 709         struct ifnet *const ifp = priv->ifp;
 710         struct mbuf *m;
 711         int isr;
 712
 713         NGI_GET_M(item, m);
 714         NG_FREE_ITEM(item);
 715         /* Sanity checks */
 716         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 717         M_ASSERTPKTHDR(m);
 718         if ((ifp->if_flags & IFF_UP) == 0) {
 719                 NG_FREE_M(m);
 720                 return (ENETDOWN);
 721         }
 722
 723         /* Update interface stats */
 724         ifp->if_ipackets++;
 725         ifp->if_ibytes += m->m_pkthdr.len;
 726
 727         /* Note receiving interface */
 728         m->m_pkthdr.rcvif = ifp;
 729
 730         /* Berkeley packet filter */
 731         ng_iface_bpftap(ifp, m, iffam->family);
 732
 733         /* Send packet */
 734         switch (iffam->family) {
 735 #ifdef INET
 736         case AF_INET:
 737                 isr = NETISR_IP;
 738                 break;
 739 #endif
 740 #ifdef INET6
 741         case AF_INET6:
 742                 isr = NETISR_IPV6;
 743                 break;
 744 #endif
 745 #ifdef IPX
 746         case AF_IPX:
 747                 isr = NETISR_IPX;
 748                 break;
 749 #endif
 750 #ifdef NETATALK
 751         case AF_APPLETALK:
 752                 isr = NETISR_ATALK2;
 753                 break;
 754 #endif
 755         default:
 756                 m_freem(m);
 757                 return (EAFNOSUPPORT);
 758         }
 759         /* First chunk of an mbuf contains good junk */
 760         if (harvest.point_to_point)
 761                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 762         netisr_dispatch(isr, m);
 763         return (0);
 764 }
 765
 766 /*
 767  * Shutdown and remove the node and its associated interface.
 768  */
 769 static int
 770 ng_iface_shutdown(node_p node)
 771 {
 772         INIT_VNET_NETGRAPH(curvnet);
 773         const priv_p priv = NG_NODE_PRIVATE(node);
 774
 775         /*
 776          * The ifnet may be in a different vnet than the netgraph node,
 777          * hence we have to change the current vnet context here.
 778          */
 779         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 780         bpfdetach(priv->ifp);
 781         if_detach(priv->ifp);
 782         if_free(priv->ifp);
 783         CURVNET_RESTORE();
 784         priv->ifp = NULL;
 785         free_unr(V_ng_iface_unit, priv->unit);
 786         free(priv, M_NETGRAPH_IFACE);
 787         NG_NODE_SET_PRIVATE(node, NULL);
 788         NG_NODE_UNREF(node);
 789         return (0);
 790 }
 791
 792 /*
 793  * Hook disconnection. Note that we do *not* shutdown when all
 794  * hooks have been disconnected.
 795  */
 796 static int
 797 ng_iface_disconnect(hook_p hook)
 798 {
 799         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 800         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 801
 802         if (iffam == NULL)
 803                 panic(__func__);
 804         *get_hook_from_iffam(priv, iffam) = NULL;
 805         return (0);
 806 }
 807
 808 /*
 809  * Handle loading and unloading for this node type.
 810  */
 811 static int
 812 ng_iface_mod_event(module_t mod, int event, void *data)
 813 {
 814         int error = 0;
 815
 816         switch (event) {
 817         case MOD_LOAD:
 818                 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 819                 break;
 820         case MOD_UNLOAD:
 821                 delete_unrhdr(V_ng_iface_unit);
 822                 break;
 823         default:
 824                 error = EOPNOTSUPP;
 825                 break;
 826         }
 827         return (error);
 828 }