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 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         struct m_tag *mtag;
 357         uint32_t af;
 358         int error;
 359
 360         /* Check interface flags */
 361         if (!((ifp->if_flags & IFF_UP) &&
 362             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 363                 m_freem(m);
 364                 return (ENETDOWN);
 365         }
 366
 367         /* Protect from deadly infinite recursion. */
 368         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, NULL))) {
 369                 if (*(struct ifnet **)(mtag + 1) == ifp) {
 370                         log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname);
 371                         m_freem(m);
 372                         return (EDEADLK);
 373                 }
 374         }
 375         mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *),
 376             M_NOWAIT);
 377         if (mtag == NULL) {
 378                 m_freem(m);
 379                 return (ENOMEM);
 380         }
 381         *(struct ifnet **)(mtag + 1) = ifp;
 382         m_tag_prepend(m, mtag);
 383
 384         /* BPF writes need to be handled specially. */
 385         if (dst->sa_family == AF_UNSPEC) {
 386                 bcopy(dst->sa_data, &af, sizeof(af));
 387                 dst->sa_family = af;
 388         }
 389
 390         /* Berkeley packet filter */
 391         ng_iface_bpftap(ifp, m, dst->sa_family);
 392
 393         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 394                 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT);
 395                 if (m == NULL) {
 396                         IFQ_LOCK(&ifp->if_snd);
 397                         IFQ_INC_DROPS(&ifp->if_snd);
 398                         IFQ_UNLOCK(&ifp->if_snd);
 399                         ifp->if_oerrors++;
 400                         return (ENOBUFS);
 401                 }
 402                 *(sa_family_t *)m->m_data = dst->sa_family;
 403                 IFQ_HANDOFF(ifp, m, error);
 404         } else
 405                 error = ng_iface_send(ifp, m, dst->sa_family);
 406
 407         return (error);
 408 }
 409
 410 /*
 411  * Start method is used only when ALTQ is enabled.
 412  */
 413 static void
 414 ng_iface_start(struct ifnet *ifp)
 415 {
 416         struct mbuf *m;
 417         sa_family_t sa;
 418
 419         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 420
 421         for(;;) {
 422                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 423                 if (m == NULL)
 424                         break;
 425                 sa = *mtod(m, sa_family_t *);
 426                 m_adj(m, sizeof(sa_family_t));
 427                 ng_iface_send(ifp, m, sa);
 428         }
 429 }
 430
 431 /*
 432  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 433  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 434  */
 435 static void
 436 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 437 {
 438         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 439         if (bpf_peers_present(ifp->if_bpf)) {
 440                 int32_t family4 = (int32_t)family;
 441                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 442         }
 443 }
 444
 445 /*
 446  * This routine does actual delivery of the packet into the
 447  * netgraph(4). It is called from ng_iface_start() and
 448  * ng_iface_output().
 449  */
 450 static int
 451 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 452 {
 453         const priv_p priv = (priv_p) ifp->if_softc;
 454         const iffam_p iffam = get_iffam_from_af(sa);
 455         int error;
 456         int len;
 457
 458         /* Check address family to determine hook (if known) */
 459         if (iffam == NULL) {
 460                 m_freem(m);
 461                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 462                 return (EAFNOSUPPORT);
 463         }
 464
 465         /* Copy length before the mbuf gets invalidated. */
 466         len = m->m_pkthdr.len;
 467
 468         /* Send packet. If hook is not connected,
 469            mbuf will get freed. */
 470         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 471
 472         /* Update stats. */
 473         if (error == 0) {
 474                 ifp->if_obytes += len;
 475                 ifp->if_opackets++;
 476         }
 477
 478         return (error);
 479 }
 480
 481 #ifdef DEBUG
 482 /*
 483  * Display an ioctl to the virtual interface
 484  */
 485
 486 static void
 487 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 488 {
 489         char   *str;
 490
 491         switch (command & IOC_DIRMASK) {
 492         case IOC_VOID:
 493                 str = "IO";
 494                 break;
 495         case IOC_OUT:
 496                 str = "IOR";
 497                 break;
 498         case IOC_IN:
 499                 str = "IOW";
 500                 break;
 501         case IOC_INOUT:
 502                 str = "IORW";
 503                 break;
 504         default:
 505                 str = "IO??";
 506         }
 507         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 508                ifp->if_xname,
 509                str,
 510                IOCGROUP(command),
 511                command & 0xff,
 512                IOCPARM_LEN(command));
 513 }
 514 #endif /* DEBUG */
 515
 516 /************************************************************************
 517                         NETGRAPH NODE STUFF
 518  ************************************************************************/
 519
 520 /*
 521  * Constructor for a node
 522  */
 523 static int
 524 ng_iface_constructor(node_p node)
 525 {
 526         struct ifnet *ifp;
 527         priv_p priv;
 528
 529         /* Allocate node and interface private structures */
 530         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
 531         if (priv == NULL)
 532                 return (ENOMEM);
 533         ifp = if_alloc(IFT_PROPVIRTUAL);
 534         if (ifp == NULL) {
 535                 FREE(priv, M_NETGRAPH_IFACE);
 536                 return (ENOMEM);
 537         }
 538
 539         /* Link them together */
 540         ifp->if_softc = priv;
 541         priv->ifp = ifp;
 542
 543         /* Get an interface unit number */
 544         priv->unit = alloc_unr(ng_iface_unit);
 545
 546         /* Link together node and private info */
 547         NG_NODE_SET_PRIVATE(node, priv);
 548         priv->node = node;
 549
 550         /* Initialize interface structure */
 551         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 552         ifp->if_output = ng_iface_output;
 553         ifp->if_start = ng_iface_start;
 554         ifp->if_ioctl = ng_iface_ioctl;
 555         ifp->if_watchdog = NULL;
 556         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 557         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 558         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 559         ifp->if_addrlen = 0;                    /* XXX */
 560         ifp->if_hdrlen = 0;                     /* XXX */
 561         ifp->if_baudrate = 64000;               /* XXX */
 562         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
 563         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
 564         IFQ_SET_READY(&ifp->if_snd);
 565
 566         /* Give this node the same name as the interface (if possible) */
 567         if (ng_name_node(node, ifp->if_xname) != 0)
 568                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 569                     ifp->if_xname);
 570
 571         /* Attach the interface */
 572         if_attach(ifp);
 573         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 574
 575         /* Done */
 576         return (0);
 577 }
 578
 579 /*
 580  * Give our ok for a hook to be added
 581  */
 582 static int
 583 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 584 {
 585         const iffam_p iffam = get_iffam_from_name(name);
 586         hook_p *hookptr;
 587
 588         if (iffam == NULL)
 589                 return (EPFNOSUPPORT);
 590         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 591         if (*hookptr != NULL)
 592                 return (EISCONN);
 593         *hookptr = hook;
 594         NG_HOOK_HI_STACK(hook);
 595         return (0);
 596 }
 597
 598 /*
 599  * Receive a control message
 600  */
 601 static int
 602 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 603 {
 604         const priv_p priv = NG_NODE_PRIVATE(node);
 605         struct ifnet *const ifp = priv->ifp;
 606         struct ng_mesg *resp = NULL;
 607         int error = 0;
 608         struct ng_mesg *msg;
 609
 610         NGI_GET_MSG(item, msg);
 611         switch (msg->header.typecookie) {
 612         case NGM_IFACE_COOKIE:
 613                 switch (msg->header.cmd) {
 614                 case NGM_IFACE_GET_IFNAME:
 615                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 616                         if (resp == NULL) {
 617                                 error = ENOMEM;
 618                                 break;
 619                         }
 620                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 621                         break;
 622
 623                 case NGM_IFACE_POINT2POINT:
 624                 case NGM_IFACE_BROADCAST:
 625                     {
 626
 627                         /* Deny request if interface is UP */
 628                         if ((ifp->if_flags & IFF_UP) != 0)
 629                                 return (EBUSY);
 630
 631                         /* Change flags */
 632                         switch (msg->header.cmd) {
 633                         case NGM_IFACE_POINT2POINT:
 634                                 ifp->if_flags |= IFF_POINTOPOINT;
 635                                 ifp->if_flags &= ~IFF_BROADCAST;
 636                                 break;
 637                         case NGM_IFACE_BROADCAST:
 638                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 639                                 ifp->if_flags |= IFF_BROADCAST;
 640                                 break;
 641                         }
 642                         break;
 643                     }
 644
 645                 case NGM_IFACE_GET_IFINDEX:
 646                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 647                         if (resp == NULL) {
 648                                 error = ENOMEM;
 649                                 break;
 650                         }
 651                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 652                         break;
 653
 654                 default:
 655                         error = EINVAL;
 656                         break;
 657                 }
 658                 break;
 659         case NGM_CISCO_COOKIE:
 660                 switch (msg->header.cmd) {
 661                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 662                     {
 663                         struct ifaddr *ifa;
 664
 665                         /* Return the first configured IP address */
 666                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 667                                 struct ng_cisco_ipaddr *ips;
 668
 669                                 if (ifa->ifa_addr->sa_family != AF_INET)
 670                                         continue;
 671                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 672                                 if (resp == NULL) {
 673                                         error = ENOMEM;
 674                                         break;
 675                                 }
 676                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 677                                 ips->ipaddr = ((struct sockaddr_in *)
 678                                                 ifa->ifa_addr)->sin_addr;
 679                                 ips->netmask = ((struct sockaddr_in *)
 680                                                 ifa->ifa_netmask)->sin_addr;
 681                                 break;
 682                         }
 683
 684                         /* No IP addresses on this interface? */
 685                         if (ifa == NULL)
 686                                 error = EADDRNOTAVAIL;
 687                         break;
 688                     }
 689                 default:
 690                         error = EINVAL;
 691                         break;
 692                 }
 693                 break;
 694         case NGM_FLOW_COOKIE:
 695                 switch (msg->header.cmd) {
 696                 case NGM_LINK_IS_UP:
 697                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 698                         break;
 699                 case NGM_LINK_IS_DOWN:
 700                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 701                         break;
 702                 default:
 703                         break;
 704                 }
 705                 break;
 706         default:
 707                 error = EINVAL;
 708                 break;
 709         }
 710         NG_RESPOND_MSG(error, node, item, resp);
 711         NG_FREE_MSG(msg);
 712         return (error);
 713 }
 714
 715 /*
 716  * Recive data from a hook. Pass the packet to the correct input routine.
 717  */
 718 static int
 719 ng_iface_rcvdata(hook_p hook, item_p item)
 720 {
 721         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 722         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 723         struct ifnet *const ifp = priv->ifp;
 724         struct mbuf *m;
 725         int isr;
 726
 727         NGI_GET_M(item, m);
 728         NG_FREE_ITEM(item);
 729         /* Sanity checks */
 730         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 731         M_ASSERTPKTHDR(m);
 732         if ((ifp->if_flags & IFF_UP) == 0) {
 733                 NG_FREE_M(m);
 734                 return (ENETDOWN);
 735         }
 736
 737         /* Update interface stats */
 738         ifp->if_ipackets++;
 739         ifp->if_ibytes += m->m_pkthdr.len;
 740
 741         /* Note receiving interface */
 742         m->m_pkthdr.rcvif = ifp;
 743
 744         /* Berkeley packet filter */
 745         ng_iface_bpftap(ifp, m, iffam->family);
 746
 747         /* Send packet */
 748         switch (iffam->family) {
 749 #ifdef INET
 750         case AF_INET:
 751                 isr = NETISR_IP;
 752                 break;
 753 #endif
 754 #ifdef INET6
 755         case AF_INET6:
 756                 isr = NETISR_IPV6;
 757                 break;
 758 #endif
 759 #ifdef IPX
 760         case AF_IPX:
 761                 isr = NETISR_IPX;
 762                 break;
 763 #endif
 764 #ifdef NETATALK
 765         case AF_APPLETALK:
 766                 isr = NETISR_ATALK2;
 767                 break;
 768 #endif
 769         default:
 770                 m_freem(m);
 771                 return (EAFNOSUPPORT);
 772         }
 773         /* First chunk of an mbuf contains good junk */
 774         if (harvest.point_to_point)
 775                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 776         netisr_dispatch(isr, m);
 777         return (0);
 778 }
 779
 780 /*
 781  * Shutdown and remove the node and its associated interface.
 782  */
 783 static int
 784 ng_iface_shutdown(node_p node)
 785 {
 786         const priv_p priv = NG_NODE_PRIVATE(node);
 787
 788         bpfdetach(priv->ifp);
 789         if_detach(priv->ifp);
 790         if_free(priv->ifp);
 791         priv->ifp = NULL;
 792         free_unr(ng_iface_unit, priv->unit);
 793         FREE(priv, M_NETGRAPH_IFACE);
 794         NG_NODE_SET_PRIVATE(node, NULL);
 795         NG_NODE_UNREF(node);
 796         return (0);
 797 }
 798
 799 /*
 800  * Hook disconnection. Note that we do *not* shutdown when all
 801  * hooks have been disconnected.
 802  */
 803 static int
 804 ng_iface_disconnect(hook_p hook)
 805 {
 806         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 807         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 808
 809         if (iffam == NULL)
 810                 panic(__func__);
 811         *get_hook_from_iffam(priv, iffam) = NULL;
 812         return (0);
 813 }
 814
 815 /*
 816  * Handle loading and unloading for this node type.
 817  */
 818 static int
 819 ng_iface_mod_event(module_t mod, int event, void *data)
 820 {
 821         int error = 0;
 822
 823         switch (event) {
 824         case MOD_LOAD:
 825                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 826                 break;
 827         case MOD_UNLOAD:
 828                 delete_unrhdr(ng_iface_unit);
 829                 break;
 830         default:
 831                 error = EOPNOTSUPP;
 832                 break;
 833         }
 834         return (error);
 835 }