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, 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         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 115         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 116 };
 117 #define NUM_FAMILIES            nitems(gFamilies)
 118
 119 /* Node private data */
 120 struct ng_iface_private {
 121         struct  ifnet *ifp;             /* Our interface */
 122         int     unit;                   /* Interface unit number */
 123         node_p  node;                   /* Our netgraph node */
 124         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 125         struct rmlock   lock;           /* Protect private data changes */
 126 };
 127 typedef struct ng_iface_private *priv_p;
 128
 129 #define PRIV_RLOCK(priv, t)     rm_rlock(&priv->lock, t)
 130 #define PRIV_RUNLOCK(priv, t)   rm_runlock(&priv->lock, t)
 131 #define PRIV_WLOCK(priv)        rm_wlock(&priv->lock)
 132 #define PRIV_WUNLOCK(priv)      rm_wunlock(&priv->lock)
 133
 134 /* Interface methods */
 135 static void     ng_iface_start(struct ifnet *ifp);
 136 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 137 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 138                         const struct sockaddr *dst, struct route *ro);
 139 static void     ng_iface_bpftap(struct ifnet *ifp,
 140                         struct mbuf *m, sa_family_t family);
 141 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 142                         sa_family_t sa);
 143 #ifdef DEBUG
 144 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 145 #endif
 146
 147 /* Netgraph methods */
 148 static int              ng_iface_mod_event(module_t, int, void *);
 149 static ng_constructor_t ng_iface_constructor;
 150 static ng_rcvmsg_t      ng_iface_rcvmsg;
 151 static ng_shutdown_t    ng_iface_shutdown;
 152 static ng_newhook_t     ng_iface_newhook;
 153 static ng_rcvdata_t     ng_iface_rcvdata;
 154 static ng_disconnect_t  ng_iface_disconnect;
 155
 156 /* Helper stuff */
 157 static iffam_p  get_iffam_from_af(sa_family_t family);
 158 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 159 static iffam_p  get_iffam_from_name(const char *name);
 160 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 161
 162 /* List of commands and how to convert arguments to/from ASCII */
 163 static const struct ng_cmdlist ng_iface_cmds[] = {
 164         {
 165           NGM_IFACE_COOKIE,
 166           NGM_IFACE_GET_IFNAME,
 167           "getifname",
 168           NULL,
 169           &ng_parse_string_type
 170         },
 171         {
 172           NGM_IFACE_COOKIE,
 173           NGM_IFACE_POINT2POINT,
 174           "point2point",
 175           NULL,
 176           NULL
 177         },
 178         {
 179           NGM_IFACE_COOKIE,
 180           NGM_IFACE_BROADCAST,
 181           "broadcast",
 182           NULL,
 183           NULL
 184         },
 185         {
 186           NGM_IFACE_COOKIE,
 187           NGM_IFACE_GET_IFINDEX,
 188           "getifindex",
 189           NULL,
 190           &ng_parse_uint32_type
 191         },
 192         { 0 }
 193 };
 194
 195 /* Node type descriptor */
 196 static struct ng_type typestruct = {
 197         .version =      NG_ABI_VERSION,
 198         .name =         NG_IFACE_NODE_TYPE,
 199         .mod_event =    ng_iface_mod_event,
 200         .constructor =  ng_iface_constructor,
 201         .rcvmsg =       ng_iface_rcvmsg,
 202         .shutdown =     ng_iface_shutdown,
 203         .newhook =      ng_iface_newhook,
 204         .rcvdata =      ng_iface_rcvdata,
 205         .disconnect =   ng_iface_disconnect,
 206         .cmdlist =      ng_iface_cmds,
 207 };
 208 NETGRAPH_INIT(iface, &typestruct);
 209
 210 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit);
 211 #define V_ng_iface_unit                 VNET(ng_iface_unit)
 212
 213 /************************************************************************
 214                         HELPER STUFF
 215  ************************************************************************/
 216
 217 /*
 218  * Get the family descriptor from the family ID
 219  */
 220 static __inline iffam_p
 221 get_iffam_from_af(sa_family_t family)
 222 {
 223         iffam_p iffam;
 224         int k;
 225
 226         for (k = 0; k < NUM_FAMILIES; k++) {
 227                 iffam = &gFamilies[k];
 228                 if (iffam->family == family)
 229                         return (iffam);
 230         }
 231         return (NULL);
 232 }
 233
 234 /*
 235  * Get the family descriptor from the hook
 236  */
 237 static __inline iffam_p
 238 get_iffam_from_hook(priv_p priv, hook_p hook)
 239 {
 240         int k;
 241
 242         for (k = 0; k < NUM_FAMILIES; k++)
 243                 if (priv->hooks[k] == hook)
 244                         return (&gFamilies[k]);
 245         return (NULL);
 246 }
 247
 248 /*
 249  * Get the hook from the iffam descriptor
 250  */
 251
 252 static __inline hook_p *
 253 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 254 {
 255         return (&priv->hooks[iffam - gFamilies]);
 256 }
 257
 258 /*
 259  * Get the iffam descriptor from the name
 260  */
 261 static __inline iffam_p
 262 get_iffam_from_name(const char *name)
 263 {
 264         iffam_p iffam;
 265         int k;
 266
 267         for (k = 0; k < NUM_FAMILIES; k++) {
 268                 iffam = &gFamilies[k];
 269                 if (!strcmp(iffam->hookname, name))
 270                         return (iffam);
 271         }
 272         return (NULL);
 273 }
 274
 275 /************************************************************************
 276                         INTERFACE STUFF
 277  ************************************************************************/
 278
 279 /*
 280  * Process an ioctl for the virtual interface
 281  */
 282 static int
 283 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 284 {
 285         struct ifreq *const ifr = (struct ifreq *) data;
 286         int error = 0;
 287
 288 #ifdef DEBUG
 289         ng_iface_print_ioctl(ifp, command, data);
 290 #endif
 291         switch (command) {
 292
 293         /* These two are mostly handled at a higher layer */
 294         case SIOCSIFADDR:
 295                 ifp->if_flags |= IFF_UP;
 296                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 297                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 298                 break;
 299         case SIOCGIFADDR:
 300                 break;
 301
 302         /* Set flags */
 303         case SIOCSIFFLAGS:
 304                 /*
 305                  * If the interface is marked up and stopped, then start it.
 306                  * If it is marked down and running, then stop it.
 307                  */
 308                 if (ifr->ifr_flags & IFF_UP) {
 309                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 310                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 311                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 312                         }
 313                 } else {
 314                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 315                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 316                                     IFF_DRV_OACTIVE);
 317                 }
 318                 break;
 319
 320         /* Set the interface MTU */
 321         case SIOCSIFMTU:
 322                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 323                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 324                         error = EINVAL;
 325                 else
 326                         ifp->if_mtu = ifr->ifr_mtu;
 327                 break;
 328
 329         /* Stuff that's not supported */
 330         case SIOCADDMULTI:
 331         case SIOCDELMULTI:
 332                 error = 0;
 333                 break;
 334         case SIOCSIFPHYS:
 335                 error = EOPNOTSUPP;
 336                 break;
 337
 338         default:
 339                 error = EINVAL;
 340                 break;
 341         }
 342         return (error);
 343 }
 344
 345 /*
 346  * This routine is called to deliver a packet out the interface.
 347  * We simply look at the address family and relay the packet to
 348  * the corresponding hook, if it exists and is connected.
 349  */
 350
 351 static int
 352 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 353         const struct sockaddr *dst, struct route *ro)
 354 {
 355         uint32_t af;
 356         int error;
 357
 358         /* Check interface flags */
 359         if (!((ifp->if_flags & IFF_UP) &&
 360             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 361                 m_freem(m);
 362                 return (ENETDOWN);
 363         }
 364
 365         /* Protect from deadly infinite recursion. */
 366         error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE,
 367             V_ng_iface_max_nest);
 368         if (error) {
 369                 m_freem(m);
 370                 return (error);
 371         }
 372
 373         /* BPF writes need to be handled specially. */
 374         if (dst->sa_family == AF_UNSPEC)
 375                 bcopy(dst->sa_data, &af, sizeof(af));
 376         else
 377                 af = dst->sa_family;
 378
 379         /* Berkeley packet filter */
 380         ng_iface_bpftap(ifp, m, af);
 381
 382         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 383                 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT);
 384                 if (m == NULL) {
 385                         if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
 386                         return (ENOBUFS);
 387                 }
 388                 *(sa_family_t *)m->m_data = af;
 389                 error = (ifp->if_transmit)(ifp, m);
 390         } else
 391                 error = ng_iface_send(ifp, m, af);
 392
 393         return (error);
 394 }
 395
 396 /*
 397  * Start method is used only when ALTQ is enabled.
 398  */
 399 static void
 400 ng_iface_start(struct ifnet *ifp)
 401 {
 402         struct mbuf *m;
 403         sa_family_t sa;
 404
 405         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 406
 407         for(;;) {
 408                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 409                 if (m == NULL)
 410                         break;
 411                 sa = *mtod(m, sa_family_t *);
 412                 m_adj(m, sizeof(sa_family_t));
 413                 ng_iface_send(ifp, m, sa);
 414         }
 415 }
 416
 417 /*
 418  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 419  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 420  */
 421 static void
 422 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 423 {
 424         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 425         if (bpf_peers_present(ifp->if_bpf)) {
 426                 int32_t family4 = (int32_t)family;
 427                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 428         }
 429 }
 430
 431 /*
 432  * This routine does actual delivery of the packet into the
 433  * netgraph(4). It is called from ng_iface_start() and
 434  * ng_iface_output().
 435  */
 436 static int
 437 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 438 {
 439         struct rm_priotracker priv_tracker;
 440         const priv_p priv = (priv_p) ifp->if_softc;
 441         const iffam_p iffam = get_iffam_from_af(sa);
 442         hook_p hook;
 443         int error;
 444         int len;
 445
 446         /* Check address family to determine hook (if known) */
 447         if (iffam == NULL) {
 448                 m_freem(m);
 449                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 450                 return (EAFNOSUPPORT);
 451         }
 452
 453         /* Copy length before the mbuf gets invalidated. */
 454         len = m->m_pkthdr.len;
 455
 456         PRIV_RLOCK(priv, &priv_tracker);
 457         hook = *get_hook_from_iffam(priv, iffam);
 458         if (hook == NULL) {
 459                 NG_FREE_M(m);
 460                 PRIV_RUNLOCK(priv, &priv_tracker);
 461                 return ENETDOWN;
 462         }
 463         NG_HOOK_REF(hook);
 464         PRIV_RUNLOCK(priv, &priv_tracker);
 465
 466         NG_OUTBOUND_THREAD_REF();
 467         NG_SEND_DATA_ONLY(error, hook, m);
 468         NG_OUTBOUND_THREAD_UNREF();
 469         NG_HOOK_UNREF(hook);
 470
 471         /* Update stats. */
 472         if (error == 0) {
 473                 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
 474                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 475         }
 476
 477         return (error);
 478 }
 479
 480 #ifdef DEBUG
 481 /*
 482  * Display an ioctl to the virtual interface
 483  */
 484
 485 static void
 486 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 487 {
 488         char   *str;
 489
 490         switch (command & IOC_DIRMASK) {
 491         case IOC_VOID:
 492                 str = "IO";
 493                 break;
 494         case IOC_OUT:
 495                 str = "IOR";
 496                 break;
 497         case IOC_IN:
 498                 str = "IOW";
 499                 break;
 500         case IOC_INOUT:
 501                 str = "IORW";
 502                 break;
 503         default:
 504                 str = "IO??";
 505         }
 506         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 507                ifp->if_xname,
 508                str,
 509                IOCGROUP(command),
 510                command & 0xff,
 511                IOCPARM_LEN(command));
 512 }
 513 #endif /* DEBUG */
 514
 515 /************************************************************************
 516                         NETGRAPH NODE STUFF
 517  ************************************************************************/
 518
 519 /*
 520  * Constructor for a node
 521  */
 522 static int
 523 ng_iface_constructor(node_p node)
 524 {
 525         struct ifnet *ifp;
 526         priv_p priv;
 527
 528         /* Allocate node and interface private structures */
 529         priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO);
 530         ifp = if_alloc(IFT_PROPVIRTUAL);
 531         if (ifp == NULL) {
 532                 free(priv, M_NETGRAPH_IFACE);
 533                 return (ENOMEM);
 534         }
 535
 536         rm_init(&priv->lock, "ng_iface private rmlock");
 537
 538         /* Link them together */
 539         ifp->if_softc = priv;
 540         priv->ifp = ifp;
 541
 542         /* Get an interface unit number */
 543         priv->unit = alloc_unr(V_ng_iface_unit);
 544
 545         /* Link together node and private info */
 546         NG_NODE_SET_PRIVATE(node, priv);
 547         priv->node = node;
 548
 549         /* Initialize interface structure */
 550         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 551         ifp->if_output = ng_iface_output;
 552         ifp->if_start = ng_iface_start;
 553         ifp->if_ioctl = ng_iface_ioctl;
 554         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 555         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 556         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 557         ifp->if_addrlen = 0;                    /* XXX */
 558         ifp->if_hdrlen = 0;                     /* XXX */
 559         ifp->if_baudrate = 64000;               /* XXX */
 560         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 561         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 562         IFQ_SET_READY(&ifp->if_snd);
 563
 564         /* Give this node the same name as the interface (if possible) */
 565         if (ng_name_node(node, ifp->if_xname) != 0)
 566                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 567                     ifp->if_xname);
 568
 569         /* Attach the interface */
 570         if_attach(ifp);
 571         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 572
 573         /* Done */
 574         return (0);
 575 }
 576
 577 /*
 578  * Give our ok for a hook to be added
 579  */
 580 static int
 581 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 582 {
 583         const iffam_p iffam = get_iffam_from_name(name);
 584         const priv_p priv = NG_NODE_PRIVATE(node);
 585         hook_p *hookptr;
 586
 587         if (iffam == NULL)
 588                 return (EPFNOSUPPORT);
 589         PRIV_WLOCK(priv);
 590         hookptr = get_hook_from_iffam(priv, iffam);
 591         if (*hookptr != NULL) {
 592                 PRIV_WUNLOCK(priv);
 593                 return (EISCONN);
 594         }
 595         *hookptr = hook;
 596         NG_HOOK_HI_STACK(hook);
 597         NG_HOOK_SET_TO_INBOUND(hook);
 598         PRIV_WUNLOCK(priv);
 599         return (0);
 600 }
 601
 602 /*
 603  * Receive a control message
 604  */
 605 static int
 606 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 607 {
 608         const priv_p priv = NG_NODE_PRIVATE(node);
 609         struct ifnet *const ifp = priv->ifp;
 610         struct ng_mesg *resp = NULL;
 611         int error = 0;
 612         struct ng_mesg *msg;
 613
 614         NGI_GET_MSG(item, msg);
 615         switch (msg->header.typecookie) {
 616         case NGM_IFACE_COOKIE:
 617                 switch (msg->header.cmd) {
 618                 case NGM_IFACE_GET_IFNAME:
 619                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
 620                         if (resp == NULL) {
 621                                 error = ENOMEM;
 622                                 break;
 623                         }
 624                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 625                         break;
 626
 627                 case NGM_IFACE_POINT2POINT:
 628                 case NGM_IFACE_BROADCAST:
 629                     {
 630
 631                         /* Deny request if interface is UP */
 632                         if ((ifp->if_flags & IFF_UP) != 0)
 633                                 return (EBUSY);
 634
 635                         /* Change flags */
 636                         switch (msg->header.cmd) {
 637                         case NGM_IFACE_POINT2POINT:
 638                                 ifp->if_flags |= IFF_POINTOPOINT;
 639                                 ifp->if_flags &= ~IFF_BROADCAST;
 640                                 break;
 641                         case NGM_IFACE_BROADCAST:
 642                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 643                                 ifp->if_flags |= IFF_BROADCAST;
 644                                 break;
 645                         }
 646                         break;
 647                     }
 648
 649                 case NGM_IFACE_GET_IFINDEX:
 650                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT);
 651                         if (resp == NULL) {
 652                                 error = ENOMEM;
 653                                 break;
 654                         }
 655                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 656                         break;
 657
 658                 default:
 659                         error = EINVAL;
 660                         break;
 661                 }
 662                 break;
 663         case NGM_FLOW_COOKIE:
 664                 switch (msg->header.cmd) {
 665                 case NGM_LINK_IS_UP:
 666                         if_link_state_change(ifp, LINK_STATE_UP);
 667                         break;
 668                 case NGM_LINK_IS_DOWN:
 669                         if_link_state_change(ifp, LINK_STATE_DOWN);
 670                         break;
 671                 default:
 672                         break;
 673                 }
 674                 break;
 675         default:
 676                 error = EINVAL;
 677                 break;
 678         }
 679         NG_RESPOND_MSG(error, node, item, resp);
 680         NG_FREE_MSG(msg);
 681         return (error);
 682 }
 683
 684 /*
 685  * Recive data from a hook. Pass the packet to the correct input routine.
 686  */
 687 static int
 688 ng_iface_rcvdata(hook_p hook, item_p item)
 689 {
 690         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 691         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 692         struct ifnet *const ifp = priv->ifp;
 693         struct mbuf *m;
 694         int isr;
 695
 696         NGI_GET_M(item, m);
 697         NG_FREE_ITEM(item);
 698         /* Sanity checks */
 699         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 700         M_ASSERTPKTHDR(m);
 701         if ((ifp->if_flags & IFF_UP) == 0) {
 702                 NG_FREE_M(m);
 703                 return (ENETDOWN);
 704         }
 705
 706         /* Update interface stats */
 707         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 708         if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
 709
 710         /* Note receiving interface */
 711         m->m_pkthdr.rcvif = ifp;
 712
 713         /* Berkeley packet filter */
 714         ng_iface_bpftap(ifp, m, iffam->family);
 715
 716         /* Send packet */
 717         switch (iffam->family) {
 718 #ifdef INET
 719         case AF_INET:
 720                 isr = NETISR_IP;
 721                 break;
 722 #endif
 723 #ifdef INET6
 724         case AF_INET6:
 725                 isr = NETISR_IPV6;
 726                 break;
 727 #endif
 728         default:
 729                 m_freem(m);
 730                 return (EAFNOSUPPORT);
 731         }
 732         random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG);
 733         M_SETFIB(m, ifp->if_fib);
 734         netisr_dispatch(isr, m);
 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);