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  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
  40  */
  41
  42 /*
  43  * This node is also a system networking interface. It has
  44  * a hook for each protocol (IP, AppleTalk, etc). Packets
  45  * are simply relayed between the interface and the hooks.
  46  *
  47  * Interfaces are named ng0, ng1, etc.  New nodes take the
  48  * first available interface name.
  49  *
  50  * This node also includes Berkeley packet filter support.
  51  */
  52
  53 #include "opt_inet.h"
  54 #include "opt_inet6.h"
  55
  56 #include <sys/param.h>
  57 #include <sys/systm.h>
  58 #include <sys/errno.h>
  59 #include <sys/kernel.h>
  60 #include <sys/lock.h>
  61 #include <sys/malloc.h>
  62 #include <sys/mbuf.h>
  63 #include <sys/errno.h>
  64 #include <sys/proc.h>
  65 #include <sys/random.h>
  66 #include <sys/rmlock.h>
  67 #include <sys/sockio.h>
  68 #include <sys/socket.h>
  69 #include <sys/sysctl.h>
  70 #include <sys/syslog.h>
  71 #include <sys/libkern.h>
  72
  73 #include <net/if.h>
  74 #include <net/if_var.h>
  75 #include <net/if_private.h>
  76 #include <net/if_types.h>
  77 #include <net/bpf.h>
  78 #include <net/netisr.h>
  79 #include <net/route.h>
  80 #include <net/vnet.h>
  81
  82 #include <netinet/in.h>
  83
  84 #include <netgraph/ng_message.h>
  85 #include <netgraph/netgraph.h>
  86 #include <netgraph/ng_parse.h>
  87 #include <netgraph/ng_iface.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 static SYSCTL_NODE(_net_graph, OID_AUTO, iface, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  96     "Point to point netgraph interface");
  97 VNET_DEFINE_STATIC(int, ng_iface_max_nest) = 2;
  98 #define V_ng_iface_max_nest     VNET(ng_iface_max_nest)
  99 SYSCTL_INT(_net_graph_iface, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
 100     &VNET_NAME(ng_iface_max_nest), 0, "Max nested tunnels");
 101
 102 /* This struct describes one address family */
 103 struct iffam {
 104         sa_family_t     family;         /* Address family */
 105         const char      *hookname;      /* Name for hook */
 106 };
 107 typedef const struct iffam *iffam_p;
 108
 109 /* List of address families supported by our interface */
 110 const static struct iffam gFamilies[] = {
 111         { AF_INET,      NG_IFACE_HOOK_INET      },
 112         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 113 };
 114 #define NUM_FAMILIES            nitems(gFamilies)
 115
 116 /* Node private data */
 117 struct ng_iface_private {
 118         struct  ifnet *ifp;             /* Our interface */
 119         int     unit;                   /* Interface unit number */
 120         node_p  node;                   /* Our netgraph node */
 121         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 122         struct rmlock   lock;           /* Protect private data changes */
 123 };
 124 typedef struct ng_iface_private *priv_p;
 125
 126 #define PRIV_RLOCK(priv, t)     rm_rlock(&priv->lock, t)
 127 #define PRIV_RUNLOCK(priv, t)   rm_runlock(&priv->lock, t)
 128 #define PRIV_WLOCK(priv)        rm_wlock(&priv->lock)
 129 #define PRIV_WUNLOCK(priv)      rm_wunlock(&priv->lock)
 130
 131 /* Interface methods */
 132 static void     ng_iface_start(struct ifnet *ifp);
 133 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 134 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 135                         const struct sockaddr *dst, struct route *ro);
 136 static void     ng_iface_bpftap(struct ifnet *ifp,
 137                         struct mbuf *m, sa_family_t family);
 138 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 139                         sa_family_t sa);
 140 #ifdef DEBUG
 141 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 142 #endif
 143
 144 /* Netgraph methods */
 145 static int              ng_iface_mod_event(module_t, int, void *);
 146 static ng_constructor_t ng_iface_constructor;
 147 static ng_rcvmsg_t      ng_iface_rcvmsg;
 148 static ng_shutdown_t    ng_iface_shutdown;
 149 static ng_newhook_t     ng_iface_newhook;
 150 static ng_rcvdata_t     ng_iface_rcvdata;
 151 static ng_disconnect_t  ng_iface_disconnect;
 152
 153 /* Helper stuff */
 154 static iffam_p  get_iffam_from_af(sa_family_t family);
 155 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 156 static iffam_p  get_iffam_from_name(const char *name);
 157 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 158
 159 /* List of commands and how to convert arguments to/from ASCII */
 160 static const struct ng_cmdlist ng_iface_cmds[] = {
 161         {
 162           NGM_IFACE_COOKIE,
 163           NGM_IFACE_GET_IFNAME,
 164           "getifname",
 165           NULL,
 166           &ng_parse_string_type
 167         },
 168         {
 169           NGM_IFACE_COOKIE,
 170           NGM_IFACE_POINT2POINT,
 171           "point2point",
 172           NULL,
 173           NULL
 174         },
 175         {
 176           NGM_IFACE_COOKIE,
 177           NGM_IFACE_BROADCAST,
 178           "broadcast",
 179           NULL,
 180           NULL
 181         },
 182         {
 183           NGM_IFACE_COOKIE,
 184           NGM_IFACE_GET_IFINDEX,
 185           "getifindex",
 186           NULL,
 187           &ng_parse_uint32_type
 188         },
 189         { 0 }
 190 };
 191
 192 /* Node type descriptor */
 193 static struct ng_type typestruct = {
 194         .version =      NG_ABI_VERSION,
 195         .name =         NG_IFACE_NODE_TYPE,
 196         .mod_event =    ng_iface_mod_event,
 197         .constructor =  ng_iface_constructor,
 198         .rcvmsg =       ng_iface_rcvmsg,
 199         .shutdown =     ng_iface_shutdown,
 200         .newhook =      ng_iface_newhook,
 201         .rcvdata =      ng_iface_rcvdata,
 202         .disconnect =   ng_iface_disconnect,
 203         .cmdlist =      ng_iface_cmds,
 204 };
 205 NETGRAPH_INIT(iface, &typestruct);
 206
 207 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit);
 208 #define V_ng_iface_unit                 VNET(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 error = 0;
 284
 285 #ifdef DEBUG
 286         ng_iface_print_ioctl(ifp, command, data);
 287 #endif
 288         switch (command) {
 289         /* These two are mostly handled at a higher layer */
 290         case SIOCSIFADDR:
 291                 ifp->if_flags |= IFF_UP;
 292                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 293                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 294                 break;
 295         case SIOCGIFADDR:
 296                 break;
 297
 298         /* Set flags */
 299         case SIOCSIFFLAGS:
 300                 /*
 301                  * If the interface is marked up and stopped, then start it.
 302                  * If it is marked down and running, then stop it.
 303                  */
 304                 if (ifr->ifr_flags & IFF_UP) {
 305                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 306                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 307                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 308                         }
 309                 } else {
 310                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 311                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 312                                     IFF_DRV_OACTIVE);
 313                 }
 314                 break;
 315
 316         /* Set the interface MTU */
 317         case SIOCSIFMTU:
 318                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 319                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 320                         error = EINVAL;
 321                 else
 322                         ifp->if_mtu = ifr->ifr_mtu;
 323                 break;
 324
 325         /* Stuff that's not supported */
 326         case SIOCADDMULTI:
 327         case SIOCDELMULTI:
 328                 error = 0;
 329                 break;
 330         case SIOCSIFPHYS:
 331                 error = EOPNOTSUPP;
 332                 break;
 333
 334         default:
 335                 error = EINVAL;
 336                 break;
 337         }
 338         return (error);
 339 }
 340
 341 /*
 342  * This routine is called to deliver a packet out the interface.
 343  * We simply look at the address family and relay the packet to
 344  * the corresponding hook, if it exists and is connected.
 345  */
 346
 347 static int
 348 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 349         const struct sockaddr *dst, struct route *ro)
 350 {
 351         uint32_t af;
 352         int error;
 353
 354         /* Check interface flags */
 355         if (!((ifp->if_flags & IFF_UP) &&
 356             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 357                 m_freem(m);
 358                 return (ENETDOWN);
 359         }
 360
 361         /* Protect from deadly infinite recursion. */
 362         error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE,
 363             V_ng_iface_max_nest);
 364         if (error) {
 365                 m_freem(m);
 366                 return (error);
 367         }
 368
 369         /* BPF writes need to be handled specially. */
 370         if (dst->sa_family == AF_UNSPEC)
 371                 bcopy(dst->sa_data, &af, sizeof(af));
 372         else
 373                 af = RO_GET_FAMILY(ro, dst);
 374
 375         /* Berkeley packet filter */
 376         ng_iface_bpftap(ifp, m, af);
 377
 378         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 379                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 380                 if (m == NULL) {
 381                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
 382                         return (ENOBUFS);
 383                 }
 384                 *(sa_family_t *)m->m_data = af;
 385                 error = (ifp->if_transmit)(ifp, m);
 386         } else
 387                 error = ng_iface_send(ifp, m, af);
 388
 389         return (error);
 390 }
 391
 392 /*
 393  * Start method is used only when ALTQ is enabled.
 394  */
 395 static void
 396 ng_iface_start(struct ifnet *ifp)
 397 {
 398         struct mbuf *m;
 399         sa_family_t sa;
 400
 401         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 402
 403         for(;;) {
 404                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 405                 if (m == NULL)
 406                         break;
 407                 sa = *mtod(m, sa_family_t *);
 408                 m_adj(m, sizeof(sa_family_t));
 409                 ng_iface_send(ifp, m, sa);
 410         }
 411 }
 412
 413 /*
 414  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 415  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 416  */
 417 static void
 418 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 419 {
 420         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 421         if (bpf_peers_present(ifp->if_bpf)) {
 422                 int32_t family4 = (int32_t)family;
 423                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 424         }
 425 }
 426
 427 /*
 428  * This routine does actual delivery of the packet into the
 429  * netgraph(4). It is called from ng_iface_start() and
 430  * ng_iface_output().
 431  */
 432 static int
 433 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 434 {
 435         struct rm_priotracker priv_tracker;
 436         const priv_p priv = (priv_p) ifp->if_softc;
 437         const iffam_p iffam = get_iffam_from_af(sa);
 438         hook_p hook;
 439         int error;
 440         int len;
 441
 442         /* Check address family to determine hook (if known) */
 443         if (iffam == NULL) {
 444                 m_freem(m);
 445                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 446                 return (EAFNOSUPPORT);
 447         }
 448
 449         /* Copy length before the mbuf gets invalidated. */
 450         len = m->m_pkthdr.len;
 451
 452         PRIV_RLOCK(priv, &priv_tracker);
 453         hook = *get_hook_from_iffam(priv, iffam);
 454         if (hook == NULL) {
 455                 NG_FREE_M(m);
 456                 PRIV_RUNLOCK(priv, &priv_tracker);
 457                 return ENETDOWN;
 458         }
 459         NG_HOOK_REF(hook);
 460         PRIV_RUNLOCK(priv, &priv_tracker);
 461
 462         NG_OUTBOUND_THREAD_REF();
 463         NG_SEND_DATA_ONLY(error, hook, m);
 464         NG_OUTBOUND_THREAD_UNREF();
 465         NG_HOOK_UNREF(hook);
 466
 467         /* Update stats. */
 468         if (error == 0) {
 469                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
 470                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 471         }
 472
 473         return (error);
 474 }
 475
 476 #ifdef DEBUG
 477 /*
 478  * Display an ioctl to the virtual interface
 479  */
 480
 481 static void
 482 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 483 {
 484         char   *str;
 485
 486         switch (command & IOC_DIRMASK) {
 487         case IOC_VOID:
 488                 str = "IO";
 489                 break;
 490         case IOC_OUT:
 491                 str = "IOR";
 492                 break;
 493         case IOC_IN:
 494                 str = "IOW";
 495                 break;
 496         case IOC_INOUT:
 497                 str = "IORW";
 498                 break;
 499         default:
 500                 str = "IO??";
 501         }
 502         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 503                ifp->if_xname,
 504                str,
 505                IOCGROUP(command),
 506                command & 0xff,
 507                IOCPARM_LEN(command));
 508 }
 509 #endif /* DEBUG */
 510
 511 /************************************************************************
 512                         NETGRAPH NODE STUFF
 513  ************************************************************************/
 514
 515 /*
 516  * Constructor for a node
 517  */
 518 static int
 519 ng_iface_constructor(node_p node)
 520 {
 521         struct ifnet *ifp;
 522         priv_p priv;
 523
 524         /* Allocate node and interface private structures */
 525         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
 526         ifp = if_alloc(IFT_PROPVIRTUAL);
 527         if (ifp == NULL) {
 528                 free(priv, M_NETGRAPH_IFACE);
 529                 return (ENOMEM);
 530         }
 531
 532         rm_init(&priv->lock, "ng_iface private rmlock");
 533
 534         /* Link them together */
 535         ifp->if_softc = priv;
 536         priv->ifp = ifp;
 537
 538         /* Get an interface unit number */
 539         priv->unit = alloc_unr(V_ng_iface_unit);
 540
 541         /* Link together node and private info */
 542         NG_NODE_SET_PRIVATE(node, priv);
 543         priv->node = node;
 544
 545         /* Initialize interface structure */
 546         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 547         ifp->if_output = ng_iface_output;
 548         ifp->if_start = ng_iface_start;
 549         ifp->if_ioctl = ng_iface_ioctl;
 550         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 551         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 552         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 553         ifp->if_addrlen = 0;                    /* XXX */
 554         ifp->if_hdrlen = 0;                     /* XXX */
 555         ifp->if_baudrate = 64000;               /* XXX */
 556         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 557         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 558         IFQ_SET_READY(&ifp->if_snd);
 559
 560         /* Give this node the same name as the interface (if possible) */
 561         if (ng_name_node(node, ifp->if_xname) != 0)
 562                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 563                     ifp->if_xname);
 564
 565         /* Attach the interface */
 566         if_attach(ifp);
 567         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 568
 569         /* Done */
 570         return (0);
 571 }
 572
 573 /*
 574  * Give our ok for a hook to be added
 575  */
 576 static int
 577 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 578 {
 579         const iffam_p iffam = get_iffam_from_name(name);
 580         const priv_p priv = NG_NODE_PRIVATE(node);
 581         hook_p *hookptr;
 582
 583         if (iffam == NULL)
 584                 return (EPFNOSUPPORT);
 585         PRIV_WLOCK(priv);
 586         hookptr = get_hook_from_iffam(priv, iffam);
 587         if (*hookptr != NULL) {
 588                 PRIV_WUNLOCK(priv);
 589                 return (EISCONN);
 590         }
 591         *hookptr = hook;
 592         NG_HOOK_HI_STACK(hook);
 593         NG_HOOK_SET_TO_INBOUND(hook);
 594         PRIV_WUNLOCK(priv);
 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                         /* Deny request if interface is UP */
 627                         if ((ifp->if_flags & IFF_UP) != 0)
 628                                 return (EBUSY);
 629
 630                         /* Change flags */
 631                         switch (msg->header.cmd) {
 632                         case NGM_IFACE_POINT2POINT:
 633                                 ifp->if_flags |= IFF_POINTOPOINT;
 634                                 ifp->if_flags &= ~IFF_BROADCAST;
 635                                 break;
 636                         case NGM_IFACE_BROADCAST:
 637                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 638                                 ifp->if_flags |= IFF_BROADCAST;
 639                                 break;
 640                         }
 641                         break;
 642                     }
 643
 644                 case NGM_IFACE_GET_IFINDEX:
 645                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 646                         if (resp == NULL) {
 647                                 error = ENOMEM;
 648                                 break;
 649                         }
 650                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 651                         break;
 652
 653                 default:
 654                         error = EINVAL;
 655                         break;
 656                 }
 657                 break;
 658         case NGM_FLOW_COOKIE:
 659                 switch (msg->header.cmd) {
 660                 case NGM_LINK_IS_UP:
 661                         if_link_state_change(ifp, LINK_STATE_UP);
 662                         break;
 663                 case NGM_LINK_IS_DOWN:
 664                         if_link_state_change(ifp, LINK_STATE_DOWN);
 665                         break;
 666                 default:
 667                         break;
 668                 }
 669                 break;
 670         default:
 671                 error = EINVAL;
 672                 break;
 673         }
 674         NG_RESPOND_MSG(error, node, item, resp);
 675         NG_FREE_MSG(msg);
 676         return (error);
 677 }
 678
 679 /*
 680  * Recive data from a hook. Pass the packet to the correct input routine.
 681  */
 682 static int
 683 ng_iface_rcvdata(hook_p hook, item_p item)
 684 {
 685         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 686         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 687         struct ifnet *const ifp = priv->ifp;
 688         struct epoch_tracker et;
 689         struct mbuf *m;
 690         int isr;
 691
 692         NGI_GET_M(item, m);
 693         NG_FREE_ITEM(item);
 694         /* Sanity checks */
 695         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 696         M_ASSERTPKTHDR(m);
 697         if ((ifp->if_flags & IFF_UP) == 0) {
 698                 NG_FREE_M(m);
 699                 return (ENETDOWN);
 700         }
 701
 702         /* Update interface stats */
 703         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 704         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 705
 706         /* Note receiving interface */
 707         m->m_pkthdr.rcvif = ifp;
 708
 709         /* Berkeley packet filter */
 710         ng_iface_bpftap(ifp, m, iffam->family);
 711
 712         /* Send packet */
 713         switch (iffam->family) {
 714 #ifdef INET
 715         case AF_INET:
 716                 isr = NETISR_IP;
 717                 break;
 718 #endif
 719 #ifdef INET6
 720         case AF_INET6:
 721                 isr = NETISR_IPV6;
 722                 break;
 723 #endif
 724         default:
 725                 m_freem(m);
 726                 return (EAFNOSUPPORT);
 727         }
 728         random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG);
 729         M_SETFIB(m, ifp->if_fib);
 730         CURVNET_SET(ifp->if_vnet);
 731         NET_EPOCH_ENTER(et);
 732         netisr_dispatch(isr, m);
 733         NET_EPOCH_EXIT(et);
 734         CURVNET_RESTORE();
 735         return (0);
 736 }
 737
 738 /*
 739  * Shutdown and remove the node and its associated interface.
 740  */
 741 static int
 742 ng_iface_shutdown(node_p node)
 743 {
 744         const priv_p priv = NG_NODE_PRIVATE(node);
 745
 746         /*
 747          * The ifnet may be in a different vnet than the netgraph node,
 748          * hence we have to change the current vnet context here.
 749          */
 750         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 751         bpfdetach(priv->ifp);
 752         if_detach(priv->ifp);
 753         if_free(priv->ifp);
 754         CURVNET_RESTORE();
 755         priv->ifp = NULL;
 756         free_unr(V_ng_iface_unit, priv->unit);
 757         rm_destroy(&priv->lock);
 758         free(priv, M_NETGRAPH_IFACE);
 759         NG_NODE_SET_PRIVATE(node, NULL);
 760         NG_NODE_UNREF(node);
 761         return (0);
 762 }
 763
 764 /*
 765  * Hook disconnection. Note that we do *not* shutdown when all
 766  * hooks have been disconnected.
 767  */
 768 static int
 769 ng_iface_disconnect(hook_p hook)
 770 {
 771         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 772         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 773
 774         if (iffam == NULL)
 775                 panic("%s", __func__);
 776         PRIV_WLOCK(priv);
 777         *get_hook_from_iffam(priv, iffam) = NULL;
 778         PRIV_WUNLOCK(priv);
 779         return (0);
 780 }
 781
 782 /*
 783  * Handle loading and unloading for this node type.
 784  */
 785 static int
 786 ng_iface_mod_event(module_t mod, int event, void *data)
 787 {
 788         int error = 0;
 789
 790         switch (event) {
 791         case MOD_LOAD:
 792         case MOD_UNLOAD:
 793                 break;
 794         default:
 795                 error = EOPNOTSUPP;
 796                 break;
 797         }
 798         return (error);
 799 }
 800
 801 static void
 802 vnet_ng_iface_init(const void *unused)
 803 {
 804
 805         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 806 }
 807 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
 808     vnet_ng_iface_init, NULL);
 809
 810 static void
 811 vnet_ng_iface_uninit(const void *unused)
 812 {
 813
 814         delete_unrhdr(V_ng_iface_unit);
 815 }
 816 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
 817     vnet_ng_iface_uninit, NULL);