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, 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
  58 #include <sys/param.h>
  59 #include <sys/systm.h>
  60 #include <sys/errno.h>
  61 #include <sys/kernel.h>
  62 #include <sys/lock.h>
  63 #include <sys/malloc.h>
  64 #include <sys/mbuf.h>
  65 #include <sys/errno.h>
  66 #include <sys/proc.h>
  67 #include <sys/random.h>
  68 #include <sys/rmlock.h>
  69 #include <sys/sockio.h>
  70 #include <sys/socket.h>
  71 #include <sys/sysctl.h>
  72 #include <sys/syslog.h>
  73 #include <sys/libkern.h>
  74
  75 #include <net/if.h>
  76 #include <net/if_var.h>
  77 #include <net/if_types.h>
  78 #include <net/bpf.h>
  79 #include <net/netisr.h>
  80 #include <net/route.h>
  81 #include <net/vnet.h>
  82
  83 #include <netinet/in.h>
  84
  85 #include <netgraph/ng_message.h>
  86 #include <netgraph/netgraph.h>
  87 #include <netgraph/ng_parse.h>
  88 #include <netgraph/ng_iface.h>
  89
  90 #ifdef NG_SEPARATE_MALLOC
  91 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node");
  92 #else
  93 #define M_NETGRAPH_IFACE M_NETGRAPH
  94 #endif
  95
  96 static SYSCTL_NODE(_net_graph, OID_AUTO, iface, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  97     "Point to point netgraph interface");
  98 VNET_DEFINE_STATIC(int, ng_iface_max_nest) = 2;
  99 #define V_ng_iface_max_nest     VNET(ng_iface_max_nest)
 100 SYSCTL_INT(_net_graph_iface, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
 101     &VNET_NAME(ng_iface_max_nest), 0, "Max nested tunnels");
 102
 103 /* This struct describes one address family */
 104 struct iffam {
 105         sa_family_t     family;         /* Address family */
 106         const char      *hookname;      /* Name for hook */
 107 };
 108 typedef const struct iffam *iffam_p;
 109
 110 /* List of address families supported by our interface */
 111 const static struct iffam gFamilies[] = {
 112         { AF_INET,      NG_IFACE_HOOK_INET      },
 113         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 114 };
 115 #define NUM_FAMILIES            nitems(gFamilies)
 116
 117 /* Node private data */
 118 struct ng_iface_private {
 119         struct  ifnet *ifp;             /* Our interface */
 120         int     unit;                   /* Interface unit number */
 121         node_p  node;                   /* Our netgraph node */
 122         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 123         struct rmlock   lock;           /* Protect private data changes */
 124 };
 125 typedef struct ng_iface_private *priv_p;
 126
 127 #define PRIV_RLOCK(priv, t)     rm_rlock(&priv->lock, t)
 128 #define PRIV_RUNLOCK(priv, t)   rm_runlock(&priv->lock, t)
 129 #define PRIV_WLOCK(priv)        rm_wlock(&priv->lock)
 130 #define PRIV_WUNLOCK(priv)      rm_wunlock(&priv->lock)
 131
 132 /* Interface methods */
 133 static void     ng_iface_start(struct ifnet *ifp);
 134 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 135 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 136                         const struct sockaddr *dst, struct route *ro);
 137 static void     ng_iface_bpftap(struct ifnet *ifp,
 138                         struct mbuf *m, sa_family_t family);
 139 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 140                         sa_family_t sa);
 141 #ifdef DEBUG
 142 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 143 #endif
 144
 145 /* Netgraph methods */
 146 static int              ng_iface_mod_event(module_t, int, void *);
 147 static ng_constructor_t ng_iface_constructor;
 148 static ng_rcvmsg_t      ng_iface_rcvmsg;
 149 static ng_shutdown_t    ng_iface_shutdown;
 150 static ng_newhook_t     ng_iface_newhook;
 151 static ng_rcvdata_t     ng_iface_rcvdata;
 152 static ng_disconnect_t  ng_iface_disconnect;
 153
 154 /* Helper stuff */
 155 static iffam_p  get_iffam_from_af(sa_family_t family);
 156 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 157 static iffam_p  get_iffam_from_name(const char *name);
 158 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 159
 160 /* List of commands and how to convert arguments to/from ASCII */
 161 static const struct ng_cmdlist ng_iface_cmds[] = {
 162         {
 163           NGM_IFACE_COOKIE,
 164           NGM_IFACE_GET_IFNAME,
 165           "getifname",
 166           NULL,
 167           &ng_parse_string_type
 168         },
 169         {
 170           NGM_IFACE_COOKIE,
 171           NGM_IFACE_POINT2POINT,
 172           "point2point",
 173           NULL,
 174           NULL
 175         },
 176         {
 177           NGM_IFACE_COOKIE,
 178           NGM_IFACE_BROADCAST,
 179           "broadcast",
 180           NULL,
 181           NULL
 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 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit);
 209 #define V_ng_iface_unit                 VNET(ng_iface_unit)
 210
 211 /************************************************************************
 212                         HELPER STUFF
 213  ************************************************************************/
 214
 215 /*
 216  * Get the family descriptor from the family ID
 217  */
 218 static __inline iffam_p
 219 get_iffam_from_af(sa_family_t family)
 220 {
 221         iffam_p iffam;
 222         int k;
 223
 224         for (k = 0; k < NUM_FAMILIES; k++) {
 225                 iffam = &gFamilies[k];
 226                 if (iffam->family == family)
 227                         return (iffam);
 228         }
 229         return (NULL);
 230 }
 231
 232 /*
 233  * Get the family descriptor from the hook
 234  */
 235 static __inline iffam_p
 236 get_iffam_from_hook(priv_p priv, hook_p hook)
 237 {
 238         int k;
 239
 240         for (k = 0; k < NUM_FAMILIES; k++)
 241                 if (priv->hooks[k] == hook)
 242                         return (&gFamilies[k]);
 243         return (NULL);
 244 }
 245
 246 /*
 247  * Get the hook from the iffam descriptor
 248  */
 249
 250 static __inline hook_p *
 251 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 252 {
 253         return (&priv->hooks[iffam - gFamilies]);
 254 }
 255
 256 /*
 257  * Get the iffam descriptor from the name
 258  */
 259 static __inline iffam_p
 260 get_iffam_from_name(const char *name)
 261 {
 262         iffam_p iffam;
 263         int k;
 264
 265         for (k = 0; k < NUM_FAMILIES; k++) {
 266                 iffam = &gFamilies[k];
 267                 if (!strcmp(iffam->hookname, name))
 268                         return (iffam);
 269         }
 270         return (NULL);
 271 }
 272
 273 /************************************************************************
 274                         INTERFACE STUFF
 275  ************************************************************************/
 276
 277 /*
 278  * Process an ioctl for the virtual interface
 279  */
 280 static int
 281 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 282 {
 283         struct ifreq *const ifr = (struct ifreq *) data;
 284         int error = 0;
 285
 286 #ifdef DEBUG
 287         ng_iface_print_ioctl(ifp, command, data);
 288 #endif
 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         return (error);
 341 }
 342
 343 /*
 344  * This routine is called to deliver a packet out the interface.
 345  * We simply look at the address family and relay the packet to
 346  * the corresponding hook, if it exists and is connected.
 347  */
 348
 349 static int
 350 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 351         const struct sockaddr *dst, struct route *ro)
 352 {
 353         uint32_t af;
 354         int error;
 355
 356         /* Check interface flags */
 357         if (!((ifp->if_flags & IFF_UP) &&
 358             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 359                 m_freem(m);
 360                 return (ENETDOWN);
 361         }
 362
 363         /* Protect from deadly infinite recursion. */
 364         error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE,
 365             V_ng_iface_max_nest);
 366         if (error) {
 367                 m_freem(m);
 368                 return (error);
 369         }
 370
 371         /* BPF writes need to be handled specially. */
 372         if (dst->sa_family == AF_UNSPEC)
 373                 bcopy(dst->sa_data, &af, sizeof(af));
 374         else
 375                 af = dst->sa_family;
 376
 377         /* Berkeley packet filter */
 378         ng_iface_bpftap(ifp, m, af);
 379
 380         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 381                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 382                 if (m == NULL) {
 383                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
 384                         return (ENOBUFS);
 385                 }
 386                 *(sa_family_t *)m->m_data = af;
 387                 error = (ifp->if_transmit)(ifp, m);
 388         } else
 389                 error = ng_iface_send(ifp, m, af);
 390
 391         return (error);
 392 }
 393
 394 /*
 395  * Start method is used only when ALTQ is enabled.
 396  */
 397 static void
 398 ng_iface_start(struct ifnet *ifp)
 399 {
 400         struct mbuf *m;
 401         sa_family_t sa;
 402
 403         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 404
 405         for(;;) {
 406                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 407                 if (m == NULL)
 408                         break;
 409                 sa = *mtod(m, sa_family_t *);
 410                 m_adj(m, sizeof(sa_family_t));
 411                 ng_iface_send(ifp, m, sa);
 412         }
 413 }
 414
 415 /*
 416  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 417  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 418  */
 419 static void
 420 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 421 {
 422         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 423         if (bpf_peers_present(ifp->if_bpf)) {
 424                 int32_t family4 = (int32_t)family;
 425                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 426         }
 427 }
 428
 429 /*
 430  * This routine does actual delivery of the packet into the
 431  * netgraph(4). It is called from ng_iface_start() and
 432  * ng_iface_output().
 433  */
 434 static int
 435 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 436 {
 437         struct rm_priotracker priv_tracker;
 438         const priv_p priv = (priv_p) ifp->if_softc;
 439         const iffam_p iffam = get_iffam_from_af(sa);
 440         hook_p hook;
 441         int error;
 442         int len;
 443
 444         /* Check address family to determine hook (if known) */
 445         if (iffam == NULL) {
 446                 m_freem(m);
 447                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 448                 return (EAFNOSUPPORT);
 449         }
 450
 451         /* Copy length before the mbuf gets invalidated. */
 452         len = m->m_pkthdr.len;
 453
 454         PRIV_RLOCK(priv, &priv_tracker);
 455         hook = *get_hook_from_iffam(priv, iffam);
 456         if (hook == NULL) {
 457                 NG_FREE_M(m);
 458                 PRIV_RUNLOCK(priv, &priv_tracker);
 459                 return ENETDOWN;
 460         }
 461         NG_HOOK_REF(hook);
 462         PRIV_RUNLOCK(priv, &priv_tracker);
 463
 464         NG_OUTBOUND_THREAD_REF();
 465         NG_SEND_DATA_ONLY(error, hook, m);
 466         NG_OUTBOUND_THREAD_UNREF();
 467         NG_HOOK_UNREF(hook);
 468
 469         /* Update stats. */
 470         if (error == 0) {
 471                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
 472                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 473         }
 474
 475         return (error);
 476 }
 477
 478 #ifdef DEBUG
 479 /*
 480  * Display an ioctl to the virtual interface
 481  */
 482
 483 static void
 484 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 485 {
 486         char   *str;
 487
 488         switch (command & IOC_DIRMASK) {
 489         case IOC_VOID:
 490                 str = "IO";
 491                 break;
 492         case IOC_OUT:
 493                 str = "IOR";
 494                 break;
 495         case IOC_IN:
 496                 str = "IOW";
 497                 break;
 498         case IOC_INOUT:
 499                 str = "IORW";
 500                 break;
 501         default:
 502                 str = "IO??";
 503         }
 504         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 505                ifp->if_xname,
 506                str,
 507                IOCGROUP(command),
 508                command & 0xff,
 509                IOCPARM_LEN(command));
 510 }
 511 #endif /* DEBUG */
 512
 513 /************************************************************************
 514                         NETGRAPH NODE STUFF
 515  ************************************************************************/
 516
 517 /*
 518  * Constructor for a node
 519  */
 520 static int
 521 ng_iface_constructor(node_p node)
 522 {
 523         struct ifnet *ifp;
 524         priv_p priv;
 525
 526         /* Allocate node and interface private structures */
 527         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
 528         ifp = if_alloc(IFT_PROPVIRTUAL);
 529         if (ifp == NULL) {
 530                 free(priv, M_NETGRAPH_IFACE);
 531                 return (ENOMEM);
 532         }
 533
 534         rm_init(&priv->lock, "ng_iface private rmlock");
 535
 536         /* Link them together */
 537         ifp->if_softc = priv;
 538         priv->ifp = ifp;
 539
 540         /* Get an interface unit number */
 541         priv->unit = alloc_unr(V_ng_iface_unit);
 542
 543         /* Link together node and private info */
 544         NG_NODE_SET_PRIVATE(node, priv);
 545         priv->node = node;
 546
 547         /* Initialize interface structure */
 548         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 549         ifp->if_output = ng_iface_output;
 550         ifp->if_start = ng_iface_start;
 551         ifp->if_ioctl = ng_iface_ioctl;
 552         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 553         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 554         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 555         ifp->if_addrlen = 0;                    /* XXX */
 556         ifp->if_hdrlen = 0;                     /* XXX */
 557         ifp->if_baudrate = 64000;               /* XXX */
 558         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 559         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 560         IFQ_SET_READY(&ifp->if_snd);
 561
 562         /* Give this node the same name as the interface (if possible) */
 563         if (ng_name_node(node, ifp->if_xname) != 0)
 564                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 565                     ifp->if_xname);
 566
 567         /* Attach the interface */
 568         if_attach(ifp);
 569         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 570
 571         /* Done */
 572         return (0);
 573 }
 574
 575 /*
 576  * Give our ok for a hook to be added
 577  */
 578 static int
 579 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 580 {
 581         const iffam_p iffam = get_iffam_from_name(name);
 582         const priv_p priv = NG_NODE_PRIVATE(node);
 583         hook_p *hookptr;
 584
 585         if (iffam == NULL)
 586                 return (EPFNOSUPPORT);
 587         PRIV_WLOCK(priv);
 588         hookptr = get_hook_from_iffam(priv, iffam);
 589         if (*hookptr != NULL) {
 590                 PRIV_WUNLOCK(priv);
 591                 return (EISCONN);
 592         }
 593         *hookptr = hook;
 594         NG_HOOK_HI_STACK(hook);
 595         NG_HOOK_SET_TO_INBOUND(hook);
 596         PRIV_WUNLOCK(priv);
 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_FLOW_COOKIE:
 662                 switch (msg->header.cmd) {
 663                 case NGM_LINK_IS_UP:
 664                         if_link_state_change(ifp, LINK_STATE_UP);
 665                         break;
 666                 case NGM_LINK_IS_DOWN:
 667                         if_link_state_change(ifp, LINK_STATE_DOWN);
 668                         break;
 669                 default:
 670                         break;
 671                 }
 672                 break;
 673         default:
 674                 error = EINVAL;
 675                 break;
 676         }
 677         NG_RESPOND_MSG(error, node, item, resp);
 678         NG_FREE_MSG(msg);
 679         return (error);
 680 }
 681
 682 /*
 683  * Recive data from a hook. Pass the packet to the correct input routine.
 684  */
 685 static int
 686 ng_iface_rcvdata(hook_p hook, item_p item)
 687 {
 688         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 689         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 690         struct ifnet *const ifp = priv->ifp;
 691         struct epoch_tracker et;
 692         struct mbuf *m;
 693         int isr;
 694
 695         NGI_GET_M(item, m);
 696         NG_FREE_ITEM(item);
 697         /* Sanity checks */
 698         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 699         M_ASSERTPKTHDR(m);
 700         if ((ifp->if_flags & IFF_UP) == 0) {
 701                 NG_FREE_M(m);
 702                 return (ENETDOWN);
 703         }
 704
 705         /* Update interface stats */
 706         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 707         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 708
 709         /* Note receiving interface */
 710         m->m_pkthdr.rcvif = ifp;
 711
 712         /* Berkeley packet filter */
 713         ng_iface_bpftap(ifp, m, iffam->family);
 714
 715         /* Send packet */
 716         switch (iffam->family) {
 717 #ifdef INET
 718         case AF_INET:
 719                 isr = NETISR_IP;
 720                 break;
 721 #endif
 722 #ifdef INET6
 723         case AF_INET6:
 724                 isr = NETISR_IPV6;
 725                 break;
 726 #endif
 727         default:
 728                 m_freem(m);
 729                 return (EAFNOSUPPORT);
 730         }
 731         random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG);
 732         M_SETFIB(m, ifp->if_fib);
 733         CURVNET_SET(ifp->if_vnet);
 734         NET_EPOCH_ENTER(et);
 735         netisr_dispatch(isr, m);
 736         NET_EPOCH_EXIT(et);
 737         CURVNET_RESTORE();
 738         return (0);
 739 }
 740
 741 /*
 742  * Shutdown and remove the node and its associated interface.
 743  */
 744 static int
 745 ng_iface_shutdown(node_p node)
 746 {
 747         const priv_p priv = NG_NODE_PRIVATE(node);
 748
 749         /*
 750          * The ifnet may be in a different vnet than the netgraph node,
 751          * hence we have to change the current vnet context here.
 752          */
 753         CURVNET_SET_QUIET(priv->ifp->if_vnet);
 754         bpfdetach(priv->ifp);
 755         if_detach(priv->ifp);
 756         if_free(priv->ifp);
 757         CURVNET_RESTORE();
 758         priv->ifp = NULL;
 759         free_unr(V_ng_iface_unit, priv->unit);
 760         rm_destroy(&priv->lock);
 761         free(priv, M_NETGRAPH_IFACE);
 762         NG_NODE_SET_PRIVATE(node, NULL);
 763         NG_NODE_UNREF(node);
 764         return (0);
 765 }
 766
 767 /*
 768  * Hook disconnection. Note that we do *not* shutdown when all
 769  * hooks have been disconnected.
 770  */
 771 static int
 772 ng_iface_disconnect(hook_p hook)
 773 {
 774         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 775         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 776
 777         if (iffam == NULL)
 778                 panic("%s", __func__);
 779         PRIV_WLOCK(priv);
 780         *get_hook_from_iffam(priv, iffam) = NULL;
 781         PRIV_WUNLOCK(priv);
 782         return (0);
 783 }
 784
 785 /*
 786  * Handle loading and unloading for this node type.
 787  */
 788 static int
 789 ng_iface_mod_event(module_t mod, int event, void *data)
 790 {
 791         int error = 0;
 792
 793         switch (event) {
 794         case MOD_LOAD:
 795         case MOD_UNLOAD:
 796                 break;
 797         default:
 798                 error = EOPNOTSUPP;
 799                 break;
 800         }
 801         return (error);
 802 }
 803
 804 static void
 805 vnet_ng_iface_init(const void *unused)
 806 {
 807
 808         V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 809 }
 810 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
 811     vnet_ng_iface_init, NULL);
 812
 813 static void
 814 vnet_ng_iface_uninit(const void *unused)
 815 {
 816
 817         delete_unrhdr(V_ng_iface_unit);
 818 }
 819 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
 820     vnet_ng_iface_uninit, NULL);