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/proc.h>
  68 #include <sys/random.h>
  69 #include <sys/sockio.h>
  70 #include <sys/socket.h>
  71 #include <sys/syslog.h>
  72 #include <sys/libkern.h>
  73
  74 #include <net/if.h>
  75 #include <net/if_types.h>
  76 #include <net/bpf.h>
  77 #include <net/netisr.h>
  78 #include <net/route.h>
  79 #include <net/vnet.h>
  80
  81 #include <netinet/in.h>
  82
  83 #include <netgraph/ng_message.h>
  84 #include <netgraph/netgraph.h>
  85 #include <netgraph/ng_parse.h>
  86 #include <netgraph/ng_iface.h>
  87 #include <netgraph/ng_cisco.h>
  88
  89 #ifdef NG_SEPARATE_MALLOC
  90 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
  91 #else
  92 #define M_NETGRAPH_IFACE M_NETGRAPH
  93 #endif
  94
  95 /* This struct describes one address family */
  96 struct iffam {
  97         sa_family_t     family;         /* Address family */
  98         const char      *hookname;      /* Name for hook */
  99 };
 100 typedef const struct iffam *iffam_p;
 101
 102 /* List of address families supported by our interface */
 103 const static struct iffam gFamilies[] = {
 104         { AF_INET,      NG_IFACE_HOOK_INET      },
 105         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 106         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
 107         { AF_IPX,       NG_IFACE_HOOK_IPX       },
 108         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 109         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 110 };
 111 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
 112
 113 /* Node private data */
 114 struct ng_iface_private {
 115         struct  ifnet *ifp;             /* Our interface */
 116         int     unit;                   /* Interface unit number */
 117         node_p  node;                   /* Our netgraph node */
 118         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 119 };
 120 typedef struct ng_iface_private *priv_p;
 121
 122 /* Interface methods */
 123 static void     ng_iface_start(struct ifnet *ifp);
 124 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 125 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 126                         const struct sockaddr *dst, struct route *ro);
 127 static void     ng_iface_bpftap(struct ifnet *ifp,
 128                         struct mbuf *m, sa_family_t family);
 129 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 130                         sa_family_t sa);
 131 #ifdef DEBUG
 132 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 133 #endif
 134
 135 /* Netgraph methods */
 136 static int              ng_iface_mod_event(module_t, int, void *);
 137 static ng_constructor_t ng_iface_constructor;
 138 static ng_rcvmsg_t      ng_iface_rcvmsg;
 139 static ng_shutdown_t    ng_iface_shutdown;
 140 static ng_newhook_t     ng_iface_newhook;
 141 static ng_rcvdata_t     ng_iface_rcvdata;
 142 static ng_disconnect_t  ng_iface_disconnect;
 143
 144 /* Helper stuff */
 145 static iffam_p  get_iffam_from_af(sa_family_t family);
 146 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 147 static iffam_p  get_iffam_from_name(const char *name);
 148 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 149
 150 /* Parse type for struct ng_cisco_ipaddr */
 151 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 152         = NG_CISCO_IPADDR_TYPE_INFO;
 153 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 154         &ng_parse_struct_type,
 155         &ng_cisco_ipaddr_type_fields
 156 };
 157
 158 /* List of commands and how to convert arguments to/from ASCII */
 159 static const struct ng_cmdlist ng_iface_cmds[] = {
 160         {
 161           NGM_IFACE_COOKIE,
 162           NGM_IFACE_GET_IFNAME,
 163           "getifname",
 164           NULL,
 165           &ng_parse_string_type
 166         },
 167         {
 168           NGM_IFACE_COOKIE,
 169           NGM_IFACE_POINT2POINT,
 170           "point2point",
 171           NULL,
 172           NULL
 173         },
 174         {
 175           NGM_IFACE_COOKIE,
 176           NGM_IFACE_BROADCAST,
 177           "broadcast",
 178           NULL,
 179           NULL
 180         },
 181         {
 182           NGM_CISCO_COOKIE,
 183           NGM_CISCO_GET_IPADDR,
 184           "getipaddr",
 185           NULL,
 186           &ng_cisco_ipaddr_type
 187         },
 188         {
 189           NGM_IFACE_COOKIE,
 190           NGM_IFACE_GET_IFINDEX,
 191           "getifindex",
 192           NULL,
 193           &ng_parse_uint32_type
 194         },
 195         { 0 }
 196 };
 197
 198 /* Node type descriptor */
 199 static struct ng_type typestruct = {
 200         .version =      NG_ABI_VERSION,
 201         .name =         NG_IFACE_NODE_TYPE,
 202         .mod_event =    ng_iface_mod_event,
 203         .constructor =  ng_iface_constructor,
 204         .rcvmsg =       ng_iface_rcvmsg,
 205         .shutdown =     ng_iface_shutdown,
 206         .newhook =      ng_iface_newhook,
 207         .rcvdata =      ng_iface_rcvdata,
 208         .disconnect =   ng_iface_disconnect,
 209         .cmdlist =      ng_iface_cmds,
 210 };
 211 NETGRAPH_INIT(iface, &typestruct);
 212
 213 static VNET_DEFINE(struct unrhdr *, ng_iface_unit);
 214 #define V_ng_iface_unit                 VNET(ng_iface_unit)
 215
 216 /************************************************************************
 217                         HELPER STUFF
 218  ************************************************************************/
 219
 220 /*
 221  * Get the family descriptor from the family ID
 222  */
 223 static __inline iffam_p
 224 get_iffam_from_af(sa_family_t family)
 225 {
 226         iffam_p iffam;
 227         int k;
 228
 229         for (k = 0; k < NUM_FAMILIES; k++) {
 230                 iffam = &gFamilies[k];
 231                 if (iffam->family == family)
 232                         return (iffam);
 233         }
 234         return (NULL);
 235 }
 236
 237 /*
 238  * Get the family descriptor from the hook
 239  */
 240 static __inline iffam_p
 241 get_iffam_from_hook(priv_p priv, hook_p hook)
 242 {
 243         int k;
 244
 245         for (k = 0; k < NUM_FAMILIES; k++)
 246                 if (priv->hooks[k] == hook)
 247                         return (&gFamilies[k]);
 248         return (NULL);
 249 }
 250
 251 /*
 252  * Get the hook from the iffam descriptor
 253  */
 254
 255 static __inline hook_p *
 256 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 257 {
 258         return (&priv->hooks[iffam - gFamilies]);
 259 }
 260
 261 /*
 262  * Get the iffam descriptor from the name
 263  */
 264 static __inline iffam_p
 265 get_iffam_from_name(const char *name)
 266 {
 267         iffam_p iffam;
 268         int k;
 269
 270         for (k = 0; k < NUM_FAMILIES; k++) {
 271                 iffam = &gFamilies[k];
 272                 if (!strcmp(iffam->hookname, name))
 273                         return (iffam);
 274         }
 275         return (NULL);
 276 }
 277
 278 /************************************************************************
 279                         INTERFACE STUFF
 280  ************************************************************************/
 281
 282 /*
 283  * Process an ioctl for the virtual interface
 284  */
 285 static int
 286 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 287 {
 288         struct ifreq *const ifr = (struct ifreq *) data;
 289         int error = 0;
 290
 291 #ifdef DEBUG
 292         ng_iface_print_ioctl(ifp, command, data);
 293 #endif
 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         return (error);
 346 }
 347
 348 /*
 349  * This routine is called to deliver a packet out the interface.
 350  * We simply look at the address family and relay the packet to
 351  * the corresponding hook, if it exists and is connected.
 352  */
 353
 354 static int
 355 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 356         const struct sockaddr *dst, struct route *ro)
 357 {
 358         struct m_tag *mtag;
 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         /* Protect from deadly infinite recursion. */
 370         mtag = NULL;
 371         while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) {
 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         else
 391                 af = dst->sa_family;
 392
 393         /* Berkeley packet filter */
 394         ng_iface_bpftap(ifp, m, af);
 395
 396         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 397                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 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 = af;
 406                 error = (ifp->if_transmit)(ifp, m);
 407         } else
 408                 error = ng_iface_send(ifp, m, af);
 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, mbuf will get freed. */
 472         NG_OUTBOUND_THREAD_REF();
 473         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 474         NG_OUTBOUND_THREAD_UNREF();
 475
 476         /* Update stats. */
 477         if (error == 0) {
 478                 ifp->if_obytes += len;
 479                 ifp->if_opackets++;
 480         }
 481
 482         return (error);
 483 }
 484
 485 #ifdef DEBUG
 486 /*
 487  * Display an ioctl to the virtual interface
 488  */
 489
 490 static void
 491 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 492 {
 493         char   *str;
 494
 495         switch (command & IOC_DIRMASK) {
 496         case IOC_VOID:
 497                 str = "IO";
 498                 break;
 499         case IOC_OUT:
 500                 str = "IOR";
 501                 break;
 502         case IOC_IN:
 503                 str = "IOW";
 504                 break;
 505         case IOC_INOUT:
 506                 str = "IORW";
 507                 break;
 508         default:
 509                 str = "IO??";
 510         }
 511         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 512                ifp->if_xname,
 513                str,
 514                IOCGROUP(command),
 515                command & 0xff,
 516                IOCPARM_LEN(command));
 517 }
 518 #endif /* DEBUG */
 519
 520 /************************************************************************
 521                         NETGRAPH NODE STUFF
 522  ************************************************************************/
 523
 524 /*
 525  * Constructor for a node
 526  */
 527 static int
 528 ng_iface_constructor(node_p node)
 529 {
 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_WAITOK | M_ZERO);
 535         ifp = if_alloc(IFT_PROPVIRTUAL);
 536         if (ifp == NULL) {
 537                 free(priv, M_NETGRAPH_IFACE);
 538                 return (ENOMEM);
 539         }
 540
 541         /* Link them together */
 542         ifp->if_softc = priv;
 543         priv->ifp = ifp;
 544
 545         /* Get an interface unit number */
 546         priv->unit = alloc_unr(V_ng_iface_unit);
 547
 548         /* Link together node and private info */
 549         NG_NODE_SET_PRIVATE(node, priv);
 550         priv->node = node;
 551
 552         /* Initialize interface structure */
 553         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 554         ifp->if_output = ng_iface_output;
 555         ifp->if_start = ng_iface_start;
 556         ifp->if_ioctl = ng_iface_ioctl;
 557         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 558         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 559         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 560         ifp->if_addrlen = 0;                    /* XXX */
 561         ifp->if_hdrlen = 0;                     /* XXX */
 562         ifp->if_baudrate = 64000;               /* XXX */
 563         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 564         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 565         IFQ_SET_READY(&ifp->if_snd);
 566
 567         /* Give this node the same name as the interface (if possible) */
 568         if (ng_name_node(node, ifp->if_xname) != 0)
 569                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 570                     ifp->if_xname);
 571
 572         /* Attach the interface */
 573         if_attach(ifp);
 574         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 575
 576         /* Done */
 577         return (0);
 578 }
 579
 580 /*
 581  * Give our ok for a hook to be added
 582  */
 583 static int
 584 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 585 {
 586         const iffam_p iffam = get_iffam_from_name(name);
 587         hook_p *hookptr;
 588
 589         if (iffam == NULL)
 590                 return (EPFNOSUPPORT);
 591         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 592         if (*hookptr != NULL)
 593                 return (EISCONN);
 594         *hookptr = hook;
 595         NG_HOOK_HI_STACK(hook);
 596         NG_HOOK_SET_TO_INBOUND(hook);
 597         return (0);
 598 }
 599
 600 /*
 601  * Receive a control message
 602  */
 603 static int
 604 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 605 {
 606         const priv_p priv = NG_NODE_PRIVATE(node);
 607         struct ifnet *const ifp = priv->ifp;
 608         struct ng_mesg *resp = NULL;
 609         int error = 0;
 610         struct ng_mesg *msg;
 611
 612         NGI_GET_MSG(item, msg);
 613         switch (msg->header.typecookie) {
 614         case NGM_IFACE_COOKIE:
 615                 switch (msg->header.cmd) {
 616                 case NGM_IFACE_GET_IFNAME:
 617                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 618                         if (resp == NULL) {
 619                                 error = ENOMEM;
 620                                 break;
 621                         }
 622                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 623                         break;
 624
 625                 case NGM_IFACE_POINT2POINT:
 626                 case NGM_IFACE_BROADCAST:
 627                     {
 628
 629                         /* Deny request if interface is UP */
 630                         if ((ifp->if_flags & IFF_UP) != 0)
 631                                 return (EBUSY);
 632
 633                         /* Change flags */
 634                         switch (msg->header.cmd) {
 635                         case NGM_IFACE_POINT2POINT:
 636                                 ifp->if_flags |= IFF_POINTOPOINT;
 637                                 ifp->if_flags &= ~IFF_BROADCAST;
 638                                 break;
 639                         case NGM_IFACE_BROADCAST:
 640                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 641                                 ifp->if_flags |= IFF_BROADCAST;
 642                                 break;
 643                         }
 644                         break;
 645                     }
 646
 647                 case NGM_IFACE_GET_IFINDEX:
 648                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 649                         if (resp == NULL) {
 650                                 error = ENOMEM;
 651                                 break;
 652                         }
 653                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 654                         break;
 655
 656                 default:
 657                         error = EINVAL;
 658                         break;
 659                 }
 660                 break;
 661         case NGM_CISCO_COOKIE:
 662                 switch (msg->header.cmd) {
 663                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 664                     {
 665                         struct ifaddr *ifa;
 666
 667                         /* Return the first configured IP address */
 668                         if_addr_rlock(ifp);
 669                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 670                                 struct ng_cisco_ipaddr *ips;
 671
 672                                 if (ifa->ifa_addr->sa_family != AF_INET)
 673                                         continue;
 674                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 675                                 if (resp == NULL) {
 676                                         error = ENOMEM;
 677                                         break;
 678                                 }
 679                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 680                                 ips->ipaddr = ((struct sockaddr_in *)
 681                                                 ifa->ifa_addr)->sin_addr;
 682                                 ips->netmask = ((struct sockaddr_in *)
 683                                                 ifa->ifa_netmask)->sin_addr;
 684                                 break;
 685                         }
 686                         if_addr_runlock(ifp);
 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         if (harvest.point_to_point)
 778                 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_NG);
 779         M_SETFIB(m, ifp->if_fib);
 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         const priv_p priv = NG_NODE_PRIVATE(node);
 791
 792         /*
 793          * The ifnet may be in a different vnet than the netgraph node,
 794          * hence we have to change the current vnet context here.
 795          */
 796         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 797         bpfdetach(priv->ifp);
 798         if_detach(priv->ifp);
 799         if_free(priv->ifp);
 800         CURVNET_RESTORE();
 801         priv->ifp = NULL;
 802         free_unr(V_ng_iface_unit, priv->unit);
 803         free(priv, M_NETGRAPH_IFACE);
 804         NG_NODE_SET_PRIVATE(node, NULL);
 805         NG_NODE_UNREF(node);
 806         return (0);
 807 }
 808
 809 /*
 810  * Hook disconnection. Note that we do *not* shutdown when all
 811  * hooks have been disconnected.
 812  */
 813 static int
 814 ng_iface_disconnect(hook_p hook)
 815 {
 816         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 817         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 818
 819         if (iffam == NULL)
 820                 panic("%s", __func__);
 821         *get_hook_from_iffam(priv, iffam) = NULL;
 822         return (0);
 823 }
 824
 825 /*
 826  * Handle loading and unloading for this node type.
 827  */
 828 static int
 829 ng_iface_mod_event(module_t mod, int event, void *data)
 830 {
 831         int error = 0;
 832
 833         switch (event) {
 834         case MOD_LOAD:
 835         case MOD_UNLOAD:
 836                 break;
 837         default:
 838                 error = EOPNOTSUPP;
 839                 break;
 840         }
 841         return (error);
 842 }
 843
 844 static void
 845 vnet_ng_iface_init(const void *unused)
 846 {
 847
 848         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 849 }
 850 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
 851     vnet_ng_iface_init, NULL);
 852
 853 static void
 854 vnet_ng_iface_uninit(const void *unused)
 855 {
 856
 857         delete_unrhdr(V_ng_iface_unit);
 858 }
 859 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
 860     vnet_ng_iface_uninit, NULL);