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         struct m_tag *mtag;
 360         uint32_t af;
 361         int error;
 362
 363         /* Check interface flags */
 364         if (!((ifp->if_flags & IFF_UP) &&
 365             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 366                 m_freem(m);
 367                 return (ENETDOWN);
 368         }
 369
 370         /* Protect from deadly infinite recursion. */
 371         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, NULL))) {
 372                 if (*(struct ifnet **)(mtag + 1) == ifp) {
 373                         log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
 374                         m_freem(m);
 375                         return (EDEADLK);
 376                 }
 377         }
 378         mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
 379             M_NOWAIT);
 380         if (mtag == NULL) {
 381                 m_freem(m);
 382                 return (ENOMEM);
 383         }
 384         *(struct ifnet **)(mtag + 1) = ifp;
 385         m_tag_prepend(m, mtag);
 386
 387         /* BPF writes need to be handled specially. */
 388         if (dst->sa_family == AF_UNSPEC) {
 389                 bcopy(dst->sa_data, &af, sizeof(af));
 390                 dst->sa_family = af;
 391         }
 392
 393         /* Berkeley packet filter */
 394         ng_iface_bpftap(ifp, m, dst->sa_family);
 395
 396         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 397                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
 398                 if (m == NULL) {
 399                         IFQ_LOCK(&ifp->if_snd);
 400                         IFQ_INC_DROPS(&ifp->if_snd);
 401                         IFQ_UNLOCK(&ifp->if_snd);
 402                         ifp->if_oerrors++;
 403                         return (ENOBUFS);
 404                 }
 405                 *(sa_family_t *)m->m_data = dst->sa_family;
 406                 error = (ifp->if_transmit)(ifp, m);
 407         } else
 408                 error = ng_iface_send(ifp, m, dst->sa_family);
 409
 410         return (error);
 411 }
 412
 413 /*
 414  * Start method is used only when ALTQ is enabled.
 415  */
 416 static void
 417 ng_iface_start(struct ifnet *ifp)
 418 {
 419         struct mbuf *m;
 420         sa_family_t sa;
 421
 422         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 423
 424         for(;;) {
 425                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 426                 if (m == NULL)
 427                         break;
 428                 sa = *mtod(m, sa_family_t *);
 429                 m_adj(m, sizeof(sa_family_t));
 430                 ng_iface_send(ifp, m, sa);
 431         }
 432 }
 433
 434 /*
 435  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 436  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 437  */
 438 static void
 439 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 440 {
 441         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 442         if (bpf_peers_present(ifp->if_bpf)) {
 443                 int32_t family4 = (int32_t)family;
 444                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 445         }
 446 }
 447
 448 /*
 449  * This routine does actual delivery of the packet into the
 450  * netgraph(4). It is called from ng_iface_start() and
 451  * ng_iface_output().
 452  */
 453 static int
 454 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 455 {
 456         const priv_p priv = (priv_p) ifp->if_softc;
 457         const iffam_p iffam = get_iffam_from_af(sa);
 458         int error;
 459         int len;
 460
 461         /* Check address family to determine hook (if known) */
 462         if (iffam == NULL) {
 463                 m_freem(m);
 464                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 465                 return (EAFNOSUPPORT);
 466         }
 467
 468         /* Copy length before the mbuf gets invalidated. */
 469         len = m->m_pkthdr.len;
 470
 471         /* Send packet. If hook is not connected,
 472            mbuf will get freed. */
 473         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 474
 475         /* Update stats. */
 476         if (error == 0) {
 477                 ifp->if_obytes += len;
 478                 ifp->if_opackets++;
 479         }
 480
 481         return (error);
 482 }
 483
 484 #ifdef DEBUG
 485 /*
 486  * Display an ioctl to the virtual interface
 487  */
 488
 489 static void
 490 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 491 {
 492         char   *str;
 493
 494         switch (command & IOC_DIRMASK) {
 495         case IOC_VOID:
 496                 str = "IO";
 497                 break;
 498         case IOC_OUT:
 499                 str = "IOR";
 500                 break;
 501         case IOC_IN:
 502                 str = "IOW";
 503                 break;
 504         case IOC_INOUT:
 505                 str = "IORW";
 506                 break;
 507         default:
 508                 str = "IO??";
 509         }
 510         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 511                ifp->if_xname,
 512                str,
 513                IOCGROUP(command),
 514                command & 0xff,
 515                IOCPARM_LEN(command));
 516 }
 517 #endif /* DEBUG */
 518
 519 /************************************************************************
 520                         NETGRAPH NODE STUFF
 521  ************************************************************************/
 522
 523 /*
 524  * Constructor for a node
 525  */
 526 static int
 527 ng_iface_constructor(node_p node)
 528 {
 529         INIT_VNET_NETGRAPH(curvnet);
 530         struct ifnet *ifp;
 531         priv_p priv;
 532
 533         /* Allocate node and interface private structures */
 534         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
 535         if (priv == NULL)
 536                 return (ENOMEM);
 537         ifp = if_alloc(IFT_PROPVIRTUAL);
 538         if (ifp == NULL) {
 539                 free(priv, M_NETGRAPH_IFACE);
 540                 return (ENOMEM);
 541         }
 542
 543         /* Link them together */
 544         ifp->if_softc = priv;
 545         priv->ifp = ifp;
 546
 547         /* Get an interface unit number */
 548         priv->unit = alloc_unr(V_ng_iface_unit);
 549
 550         /* Link together node and private info */
 551         NG_NODE_SET_PRIVATE(node, priv);
 552         priv->node = node;
 553
 554         /* Initialize interface structure */
 555         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 556         ifp->if_output = ng_iface_output;
 557         ifp->if_start = ng_iface_start;
 558         ifp->if_ioctl = ng_iface_ioctl;
 559         ifp->if_watchdog = NULL;
 560         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 561         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 562         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 563         ifp->if_addrlen = 0;                    /* XXX */
 564         ifp->if_hdrlen = 0;                     /* XXX */
 565         ifp->if_baudrate = 64000;               /* XXX */
 566         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
 567         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
 568         IFQ_SET_READY(&ifp->if_snd);
 569
 570         /* Give this node the same name as the interface (if possible) */
 571         if (ng_name_node(node, ifp->if_xname) != 0)
 572                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 573                     ifp->if_xname);
 574
 575         /* Attach the interface */
 576         if_attach(ifp);
 577         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 578
 579         /* Done */
 580         return (0);
 581 }
 582
 583 /*
 584  * Give our ok for a hook to be added
 585  */
 586 static int
 587 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 588 {
 589         const iffam_p iffam = get_iffam_from_name(name);
 590         hook_p *hookptr;
 591
 592         if (iffam == NULL)
 593                 return (EPFNOSUPPORT);
 594         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 595         if (*hookptr != NULL)
 596                 return (EISCONN);
 597         *hookptr = hook;
 598         NG_HOOK_HI_STACK(hook);
 599         return (0);
 600 }
 601
 602 /*
 603  * Receive a control message
 604  */
 605 static int
 606 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 607 {
 608         const priv_p priv = NG_NODE_PRIVATE(node);
 609         struct ifnet *const ifp = priv->ifp;
 610         struct ng_mesg *resp = NULL;
 611         int error = 0;
 612         struct ng_mesg *msg;
 613
 614         NGI_GET_MSG(item, msg);
 615         switch (msg->header.typecookie) {
 616         case NGM_IFACE_COOKIE:
 617                 switch (msg->header.cmd) {
 618                 case NGM_IFACE_GET_IFNAME:
 619                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 620                         if (resp == NULL) {
 621                                 error = ENOMEM;
 622                                 break;
 623                         }
 624                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 625                         break;
 626
 627                 case NGM_IFACE_POINT2POINT:
 628                 case NGM_IFACE_BROADCAST:
 629                     {
 630
 631                         /* Deny request if interface is UP */
 632                         if ((ifp->if_flags & IFF_UP) != 0)
 633                                 return (EBUSY);
 634
 635                         /* Change flags */
 636                         switch (msg->header.cmd) {
 637                         case NGM_IFACE_POINT2POINT:
 638                                 ifp->if_flags |= IFF_POINTOPOINT;
 639                                 ifp->if_flags &= ~IFF_BROADCAST;
 640                                 break;
 641                         case NGM_IFACE_BROADCAST:
 642                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 643                                 ifp->if_flags |= IFF_BROADCAST;
 644                                 break;
 645                         }
 646                         break;
 647                     }
 648
 649                 case NGM_IFACE_GET_IFINDEX:
 650                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 651                         if (resp == NULL) {
 652                                 error = ENOMEM;
 653                                 break;
 654                         }
 655                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 656                         break;
 657
 658                 default:
 659                         error = EINVAL;
 660                         break;
 661                 }
 662                 break;
 663         case NGM_CISCO_COOKIE:
 664                 switch (msg->header.cmd) {
 665                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 666                     {
 667                         struct ifaddr *ifa;
 668
 669                         /* Return the first configured IP address */
 670                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 671                                 struct ng_cisco_ipaddr *ips;
 672
 673                                 if (ifa->ifa_addr->sa_family != AF_INET)
 674                                         continue;
 675                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 676                                 if (resp == NULL) {
 677                                         error = ENOMEM;
 678                                         break;
 679                                 }
 680                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 681                                 ips->ipaddr = ((struct sockaddr_in *)
 682                                                 ifa->ifa_addr)->sin_addr;
 683                                 ips->netmask = ((struct sockaddr_in *)
 684                                                 ifa->ifa_netmask)->sin_addr;
 685                                 break;
 686                         }
 687
 688                         /* No IP addresses on this interface? */
 689                         if (ifa == NULL)
 690                                 error = EADDRNOTAVAIL;
 691                         break;
 692                     }
 693                 default:
 694                         error = EINVAL;
 695                         break;
 696                 }
 697                 break;
 698         case NGM_FLOW_COOKIE:
 699                 switch (msg->header.cmd) {
 700                 case NGM_LINK_IS_UP:
 701                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 702                         break;
 703                 case NGM_LINK_IS_DOWN:
 704                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 705                         break;
 706                 default:
 707                         break;
 708                 }
 709                 break;
 710         default:
 711                 error = EINVAL;
 712                 break;
 713         }
 714         NG_RESPOND_MSG(error, node, item, resp);
 715         NG_FREE_MSG(msg);
 716         return (error);
 717 }
 718
 719 /*
 720  * Recive data from a hook. Pass the packet to the correct input routine.
 721  */
 722 static int
 723 ng_iface_rcvdata(hook_p hook, item_p item)
 724 {
 725         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 726         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 727         struct ifnet *const ifp = priv->ifp;
 728         struct mbuf *m;
 729         int isr;
 730
 731         NGI_GET_M(item, m);
 732         NG_FREE_ITEM(item);
 733         /* Sanity checks */
 734         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 735         M_ASSERTPKTHDR(m);
 736         if ((ifp->if_flags & IFF_UP) == 0) {
 737                 NG_FREE_M(m);
 738                 return (ENETDOWN);
 739         }
 740
 741         /* Update interface stats */
 742         ifp->if_ipackets++;
 743         ifp->if_ibytes += m->m_pkthdr.len;
 744
 745         /* Note receiving interface */
 746         m->m_pkthdr.rcvif = ifp;
 747
 748         /* Berkeley packet filter */
 749         ng_iface_bpftap(ifp, m, iffam->family);
 750
 751         /* Send packet */
 752         switch (iffam->family) {
 753 #ifdef INET
 754         case AF_INET:
 755                 isr = NETISR_IP;
 756                 break;
 757 #endif
 758 #ifdef INET6
 759         case AF_INET6:
 760                 isr = NETISR_IPV6;
 761                 break;
 762 #endif
 763 #ifdef IPX
 764         case AF_IPX:
 765                 isr = NETISR_IPX;
 766                 break;
 767 #endif
 768 #ifdef NETATALK
 769         case AF_APPLETALK:
 770                 isr = NETISR_ATALK2;
 771                 break;
 772 #endif
 773         default:
 774                 m_freem(m);
 775                 return (EAFNOSUPPORT);
 776         }
 777         /* First chunk of an mbuf contains good junk */
 778         if (harvest.point_to_point)
 779                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 780         netisr_dispatch(isr, m);
 781         return (0);
 782 }
 783
 784 /*
 785  * Shutdown and remove the node and its associated interface.
 786  */
 787 static int
 788 ng_iface_shutdown(node_p node)
 789 {
 790         INIT_VNET_NETGRAPH(curvnet);
 791         const priv_p priv = NG_NODE_PRIVATE(node);
 792
 793         /*
 794          * The ifnet may be in a different vnet than the netgraph node,
 795          * hence we have to change the current vnet context here.
 796          */
 797         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 798         bpfdetach(priv->ifp);
 799         if_detach(priv->ifp);
 800         if_free(priv->ifp);
 801         CURVNET_RESTORE();
 802         priv->ifp = NULL;
 803         free_unr(V_ng_iface_unit, priv->unit);
 804         free(priv, M_NETGRAPH_IFACE);
 805         NG_NODE_SET_PRIVATE(node, NULL);
 806         NG_NODE_UNREF(node);
 807         return (0);
 808 }
 809
 810 /*
 811  * Hook disconnection. Note that we do *not* shutdown when all
 812  * hooks have been disconnected.
 813  */
 814 static int
 815 ng_iface_disconnect(hook_p hook)
 816 {
 817         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 818         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 819
 820         if (iffam == NULL)
 821                 panic(__func__);
 822         *get_hook_from_iffam(priv, iffam) = NULL;
 823         return (0);
 824 }
 825
 826 /*
 827  * Handle loading and unloading for this node type.
 828  */
 829 static int
 830 ng_iface_mod_event(module_t mod, int event, void *data)
 831 {
 832         int error = 0;
 833
 834         switch (event) {
 835         case MOD_LOAD:
 836                 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 837                 break;
 838         case MOD_UNLOAD:
 839                 delete_unrhdr(V_ng_iface_unit);
 840                 break;
 841         default:
 842                 error = EOPNOTSUPP;
 843                 break;
 844         }
 845         return (error);
 846 }