sys/netgraph7/ng_iface.c

   1 /*
   2  * ng_iface.c
   3  */
   4
   5 /*-
   6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   7  * All rights reserved.
   8  *
   9  * Subject to the following obligations and disclaimer of warranty, use and
  10  * redistribution of this software, in source or object code forms, with or
  11  * without modifications are expressly permitted by Whistle Communications;
  12  * provided, however, that:
  13  * 1. Any and all reproductions of the source or object code must include the
  14  *    copyright notice above and the following disclaimer of warranties; and
  15  * 2. No rights are granted, in any manner or form, to use Whistle
  16  *    Communications, Inc. trademarks, including the mark "WHISTLE
  17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  18  *    such appears in the above copyright notice or in the software.
  19  *
  20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  36  * OF SUCH DAMAGE.
  37  *
  38  * Author: Archie Cobbs <archie@freebsd.org>
  39  *
  40  * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.48 2008/01/31 08:51:48 mav Exp $
  41  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
  42  */
  43
  44 /*
  45  * This node is also a system networking interface. It has
  46  * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
  47  * are simply relayed between the interface and the hooks.
  48  *
  49  * Interfaces are named ng0, ng1, etc.  New nodes take the
  50  * first available interface name.
  51  *
  52  * This node also includes Berkeley packet filter support.
  53  */
  54
  55 #include "opt_inet.h"
  56 #include "opt_inet6.h"
  57 #include "opt_ipx.h"
  58
  59 #include <sys/param.h>
  60 #include <sys/systm.h>
  61 #include <sys/errno.h>
  62 #include <sys/kernel.h>
  63 #include <sys/malloc.h>
  64 #include <sys/mbuf.h>
  65 #include <sys/errno.h>
  66 #include <sys/random.h>
  67 #include <sys/sockio.h>
  68 #include <sys/socket.h>
  69 #include <sys/syslog.h>
  70 #include <sys/libkern.h>
  71
  72 #include <net/if.h>
  73 #include <net/if_types.h>
  74 #include <net/bpf.h>
  75 #include <net/netisr.h>
  76
  77 #include <netinet/in.h>
  78
  79 #include "ng_message.h"
  80 #include "netgraph.h"
  81 #include "ng_parse.h"
  82 #include "ng_iface.h"
  83 #include "ng_cisco.h"
  84
  85 #ifdef NG_SEPARATE_MALLOC
  86 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
  87 #else
  88 #define M_NETGRAPH_IFACE M_NETGRAPH
  89 #endif
  90
  91 /* This struct describes one address family */
  92 struct iffam {
  93         sa_family_t     family;         /* Address family */
  94         const char      *hookname;      /* Name for hook */
  95 };
  96 typedef const struct iffam *iffam_p;
  97
  98 /* List of address families supported by our interface */
  99 const static struct iffam gFamilies[] = {
 100         { AF_INET,      NG_IFACE_HOOK_INET      },
 101         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 102         { AF_IPX,       NG_IFACE_HOOK_IPX       },
 103         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 104         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 105 };
 106 #define NUM_FAMILIES            NELEM(gFamilies)
 107
 108 /* Node private data */
 109 struct ng_iface_private {
 110         struct  ifnet *ifp;             /* Our interface */
 111         int     unit;                   /* Interface unit number */
 112         node_p  node;                   /* Our netgraph node */
 113         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 114 };
 115 typedef struct ng_iface_private *priv_p;
 116
 117 /* Interface methods */
 118 static void     ng_iface_start(struct ifnet *ifp);
 119 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 120 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 121                         struct sockaddr *dst, struct rtentry *rt0);
 122 static void     ng_iface_bpftap(struct ifnet *ifp,
 123                         struct mbuf *m, sa_family_t family);
 124 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 125                         sa_family_t sa);
 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         uint32_t af;
 355         int error;
 356
 357         /* Check interface flags */
 358         if (!((ifp->if_flags & IFF_UP) &&
 359             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 360                 m_freem(m);
 361                 return (ENETDOWN);
 362         }
 363
 364         /* BPF writes need to be handled specially. */
 365         if (dst->sa_family == AF_UNSPEC) {
 366                 bcopy(dst->sa_data, &af, sizeof(af));
 367                 dst->sa_family = af;
 368         }
 369
 370         /* Berkeley packet filter */
 371         ng_iface_bpftap(ifp, m, dst->sa_family);
 372
 373         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 374                 M_PREPEND(m, sizeof(sa_family_t), MB_DONTWAIT);
 375                 if (m == NULL) {
 376                         IFQ_LOCK(&ifp->if_snd);
 377                         IFQ_INC_DROPS(&ifp->if_snd);
 378                         IFQ_UNLOCK(&ifp->if_snd);
 379                         ifp->if_oerrors++;
 380                         return (ENOBUFS);
 381                 }
 382                 *(sa_family_t *)m->m_data = dst->sa_family;
 383                 IFQ_HANDOFF(ifp, m, error);
 384         } else
 385                 error = ng_iface_send(ifp, m, dst->sa_family);
 386
 387         return (error);
 388 }
 389
 390 /*
 391  * Start method is used only when ALTQ is enabled.
 392  */
 393 static void
 394 ng_iface_start(struct ifnet *ifp)
 395 {
 396         struct mbuf *m;
 397         sa_family_t sa;
 398
 399         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 400
 401         for(;;) {
 402                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 403                 if (m == NULL)
 404                         break;
 405                 sa = *mtod(m, sa_family_t *);
 406                 m_adj(m, sizeof(sa_family_t));
 407                 ng_iface_send(ifp, m, sa);
 408         }
 409 }
 410
 411 /*
 412  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 413  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 414  */
 415 static void
 416 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 417 {
 418         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 419         if (bpf_peers_present(ifp->if_bpf)) {
 420                 int32_t family4 = (int32_t)family;
 421                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 422         }
 423 }
 424
 425 /*
 426  * This routine does actual delivery of the packet into the
 427  * netgraph(4). It is called from ng_iface_start() and
 428  * ng_iface_output().
 429  */
 430 static int
 431 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 432 {
 433         const priv_p priv = (priv_p) ifp->if_softc;
 434         const iffam_p iffam = get_iffam_from_af(sa);
 435         int error;
 436         int len;
 437
 438         /* Check address family to determine hook (if known) */
 439         if (iffam == NULL) {
 440                 m_freem(m);
 441                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 442                 return (EAFNOSUPPORT);
 443         }
 444
 445         /* Copy length before the mbuf gets invalidated. */
 446         len = m->m_pkthdr.len;
 447
 448         /* Send packet. If hook is not connected,
 449            mbuf will get freed. */
 450         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 451
 452         /* Update stats. */
 453         if (error == 0) {
 454                 ifp->if_obytes += len;
 455                 ifp->if_opackets++;
 456         }
 457
 458         return (error);
 459 }
 460
 461 #ifdef DEBUG
 462 /*
 463  * Display an ioctl to the virtual interface
 464  */
 465
 466 static void
 467 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 468 {
 469         char   *str;
 470
 471         switch (command & IOC_DIRMASK) {
 472         case IOC_VOID:
 473                 str = "IO";
 474                 break;
 475         case IOC_OUT:
 476                 str = "IOR";
 477                 break;
 478         case IOC_IN:
 479                 str = "IOW";
 480                 break;
 481         case IOC_INOUT:
 482                 str = "IORW";
 483                 break;
 484         default:
 485                 str = "IO??";
 486         }
 487         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 488                ifp->if_xname,
 489                str,
 490                IOCGROUP(command),
 491                command & 0xff,
 492                IOCPARM_LEN(command));
 493 }
 494 #endif /* DEBUG */
 495
 496 /************************************************************************
 497                         NETGRAPH NODE STUFF
 498  ************************************************************************/
 499
 500 /*
 501  * Constructor for a node
 502  */
 503 static int
 504 ng_iface_constructor(node_p node)
 505 {
 506         struct ifnet *ifp;
 507         priv_p priv;
 508
 509         /* Allocate node and interface private structures */
 510         priv = kmalloc(sizeof(*priv), M_NETGRAPH_IFACE,
 511                        M_WAITOK | M_NULLOK | M_ZERO);
 512         if (priv == NULL)
 513                 return (ENOMEM);
 514         ifp = if_alloc(IFT_PROPVIRTUAL);
 515         if (ifp == NULL) {
 516                 kfree(priv, M_NETGRAPH_IFACE);
 517                 return (ENOMEM);
 518         }
 519
 520         /* Link them together */
 521         ifp->if_softc = priv;
 522         priv->ifp = ifp;
 523
 524         /* Get an interface unit number */
 525         priv->unit = alloc_unr(ng_iface_unit);
 526
 527         /* Link together node and private info */
 528         NG_NODE_SET_PRIVATE(node, priv);
 529         priv->node = node;
 530
 531         /* Initialize interface structure */
 532         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 533         ifp->if_output = ng_iface_output;
 534         ifp->if_start = ng_iface_start;
 535         ifp->if_ioctl = ng_iface_ioctl;
 536         ifp->if_watchdog = NULL;
 537         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 538         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 539         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 540         ifp->if_addrlen = 0;                    /* XXX */
 541         ifp->if_hdrlen = 0;                     /* XXX */
 542         ifp->if_baudrate = 64000;               /* XXX */
 543         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
 544         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
 545         IFQ_SET_READY(&ifp->if_snd);
 546
 547         /* Give this node the same name as the interface (if possible) */
 548         if (ng_name_node(node, ifp->if_xname) != 0)
 549                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 550                     ifp->if_xname);
 551
 552         /* Attach the interface */
 553         if_attach(ifp);
 554         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 555
 556         /* Done */
 557         return (0);
 558 }
 559
 560 /*
 561  * Give our ok for a hook to be added
 562  */
 563 static int
 564 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 565 {
 566         const iffam_p iffam = get_iffam_from_name(name);
 567         hook_p *hookptr;
 568
 569         if (iffam == NULL)
 570                 return (EPFNOSUPPORT);
 571         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 572         if (*hookptr != NULL)
 573                 return (EISCONN);
 574         *hookptr = hook;
 575         NG_HOOK_HI_STACK(hook);
 576         return (0);
 577 }
 578
 579 /*
 580  * Receive a control message
 581  */
 582 static int
 583 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 584 {
 585         const priv_p priv = NG_NODE_PRIVATE(node);
 586         struct ifnet *const ifp = priv->ifp;
 587         struct ng_mesg *resp = NULL;
 588         int error = 0;
 589         struct ng_mesg *msg;
 590
 591         NGI_GET_MSG(item, msg);
 592         switch (msg->header.typecookie) {
 593         case NGM_IFACE_COOKIE:
 594                 switch (msg->header.cmd) {
 595                 case NGM_IFACE_GET_IFNAME:
 596                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
 597                         if (resp == NULL) {
 598                                 error = ENOMEM;
 599                                 break;
 600                         }
 601                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 602                         break;
 603
 604                 case NGM_IFACE_POINT2POINT:
 605                 case NGM_IFACE_BROADCAST:
 606                     {
 607
 608                         /* Deny request if interface is UP */
 609                         if ((ifp->if_flags & IFF_UP) != 0)
 610                                 return (EBUSY);
 611
 612                         /* Change flags */
 613                         switch (msg->header.cmd) {
 614                         case NGM_IFACE_POINT2POINT:
 615                                 ifp->if_flags |= IFF_POINTOPOINT;
 616                                 ifp->if_flags &= ~IFF_BROADCAST;
 617                                 break;
 618                         case NGM_IFACE_BROADCAST:
 619                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 620                                 ifp->if_flags |= IFF_BROADCAST;
 621                                 break;
 622                         }
 623                         break;
 624                     }
 625
 626                 case NGM_IFACE_GET_IFINDEX:
 627                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_WAITOK | M_NULLOK);
 628                         if (resp == NULL) {
 629                                 error = ENOMEM;
 630                                 break;
 631                         }
 632                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 633                         break;
 634
 635                 default:
 636                         error = EINVAL;
 637                         break;
 638                 }
 639                 break;
 640         case NGM_CISCO_COOKIE:
 641                 switch (msg->header.cmd) {
 642                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 643                     {
 644                         struct ifaddr *ifa;
 645
 646                         /* Return the first configured IP address */
 647                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 648                                 struct ng_cisco_ipaddr *ips;
 649
 650                                 if (ifa->ifa_addr->sa_family != AF_INET)
 651                                         continue;
 652                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_WAITOK | M_NULLOK);
 653                                 if (resp == NULL) {
 654                                         error = ENOMEM;
 655                                         break;
 656                                 }
 657                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 658                                 ips->ipaddr = ((struct sockaddr_in *)
 659                                                 ifa->ifa_addr)->sin_addr;
 660                                 ips->netmask = ((struct sockaddr_in *)
 661                                                 ifa->ifa_netmask)->sin_addr;
 662                                 break;
 663                         }
 664
 665                         /* No IP addresses on this interface? */
 666                         if (ifa == NULL)
 667                                 error = EADDRNOTAVAIL;
 668                         break;
 669                     }
 670                 default:
 671                         error = EINVAL;
 672                         break;
 673                 }
 674                 break;
 675         case NGM_FLOW_COOKIE:
 676                 switch (msg->header.cmd) {
 677                 case NGM_LINK_IS_UP:
 678                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 679                         break;
 680                 case NGM_LINK_IS_DOWN:
 681                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 682                         break;
 683                 default:
 684                         break;
 685                 }
 686                 break;
 687         default:
 688                 error = EINVAL;
 689                 break;
 690         }
 691         NG_RESPOND_MSG(error, node, item, resp);
 692         NG_FREE_MSG(msg);
 693         return (error);
 694 }
 695
 696 /*
 697  * Recive data from a hook. Pass the packet to the correct input routine.
 698  */
 699 static int
 700 ng_iface_rcvdata(hook_p hook, item_p item)
 701 {
 702         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 703         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 704         struct ifnet *const ifp = priv->ifp;
 705         struct mbuf *m;
 706         int isr;
 707
 708         NGI_GET_M(item, m);
 709         NG_FREE_ITEM(item);
 710         /* Sanity checks */
 711         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 712         M_ASSERTPKTHDR(m);
 713         if ((ifp->if_flags & IFF_UP) == 0) {
 714                 NG_FREE_M(m);
 715                 return (ENETDOWN);
 716         }
 717
 718         /* Update interface stats */
 719         ifp->if_ipackets++;
 720         ifp->if_ibytes += m->m_pkthdr.len;
 721
 722         /* Note receiving interface */
 723         m->m_pkthdr.rcvif = ifp;
 724
 725         /* Berkeley packet filter */
 726         ng_iface_bpftap(ifp, m, iffam->family);
 727
 728         /* Send packet */
 729         switch (iffam->family) {
 730 #ifdef INET
 731         case AF_INET:
 732                 isr = NETISR_IP;
 733                 break;
 734 #endif
 735 #ifdef INET6
 736         case AF_INET6:
 737                 isr = NETISR_IPV6;
 738                 break;
 739 #endif
 740 #ifdef IPX
 741         case AF_IPX:
 742                 isr = NETISR_IPX;
 743                 break;
 744 #endif
 745         default:
 746                 m_freem(m);
 747                 return (EAFNOSUPPORT);
 748         }
 749         /* First chunk of an mbuf contains good junk */
 750         if (harvest.point_to_point)
 751                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 752         netisr_queue(isr, m);
 753         return (0);
 754 }
 755
 756 /*
 757  * Shutdown and remove the node and its associated interface.
 758  */
 759 static int
 760 ng_iface_shutdown(node_p node)
 761 {
 762         const priv_p priv = NG_NODE_PRIVATE(node);
 763
 764         bpfdetach(priv->ifp);
 765         if_detach(priv->ifp);
 766         if_free(priv->ifp);
 767         priv->ifp = NULL;
 768         free_unr(ng_iface_unit, priv->unit);
 769         kfree(priv, M_NETGRAPH_IFACE);
 770         NG_NODE_SET_PRIVATE(node, NULL);
 771         NG_NODE_UNREF(node);
 772         return (0);
 773 }
 774
 775 /*
 776  * Hook disconnection. Note that we do *not* shutdown when all
 777  * hooks have been disconnected.
 778  */
 779 static int
 780 ng_iface_disconnect(hook_p hook)
 781 {
 782         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 783         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 784
 785         if (iffam == NULL)
 786                 panic(__func__);
 787         *get_hook_from_iffam(priv, iffam) = NULL;
 788         return (0);
 789 }
 790
 791 /*
 792  * Handle loading and unloading for this node type.
 793  */
 794 static int
 795 ng_iface_mod_event(module_t mod, int event, void *data)
 796 {
 797         int error = 0;
 798
 799         switch (event) {
 800         case MOD_LOAD:
 801                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 802                 break;
 803         case MOD_UNLOAD:
 804                 delete_unrhdr(ng_iface_unit);
 805                 break;
 806         default:
 807                 error = EOPNOTSUPP;
 808                 break;
 809         }
 810         return (error);
 811 }