sys/netgraph/iface/ng_iface.c

   1
   2 /*
   3  * ng_iface.c
   4  *
   5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   6  * All rights reserved.
   7  *
   8  * Subject to the following obligations and disclaimer of warranty, use and
   9  * redistribution of this software, in source or object code forms, with or
  10  * without modifications are expressly permitted by Whistle Communications;
  11  * provided, however, that:
  12  * 1. Any and all reproductions of the source or object code must include the
  13  *    copyright notice above and the following disclaimer of warranties; and
  14  * 2. No rights are granted, in any manner or form, to use Whistle
  15  *    Communications, Inc. trademarks, including the mark "WHISTLE
  16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  17  *    such appears in the above copyright notice or in the software.
  18  *
  19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  35  * OF SUCH DAMAGE.
  36  *
  37  * Author: Archie Cobbs <archie@freebsd.org>
  38  *
  39  * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.7.2.5 2002/07/02 23:44:02 archie Exp $
  40  * $DragonFly: src/sys/netgraph/iface/ng_iface.c,v 1.13 2006/12/22 23:44:57 swildner Exp $
  41  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
  42  */
  43
  44 /*
  45  * This node is also a system networking interface. It has
  46  * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
  47  * are simply relayed between the interface and the hooks.
  48  *
  49  * Interfaces are named ng0, ng1, etc.  New nodes take the
  50  * first available interface name.
  51  *
  52  * This node also includes Berkeley packet filter support.
  53  */
  54
  55 #include "opt_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/sockio.h>
  68 #include <sys/socket.h>
  69 #include <sys/syslog.h>
  70 #include <sys/libkern.h>
  71 #include <sys/thread2.h>
  72
  73 #include <net/if.h>
  74 #include <net/if_types.h>
  75 #include <net/netisr.h>
  76 #include <net/bpf.h>
  77
  78 #include <netinet/in.h>
  79
  80 #include <netgraph/ng_message.h>
  81 #include <netgraph/netgraph.h>
  82 #include <netgraph/ng_parse.h>
  83 #include "ng_iface.h"
  84 #include <netgraph/cisco/ng_cisco.h>
  85
  86 /* This struct describes one address family */
  87 struct iffam {
  88         sa_family_t     family;         /* Address family */
  89         const char      *hookname;      /* Name for hook */
  90 };
  91 typedef const struct iffam *iffam_p;
  92
  93 /* List of address families supported by our interface */
  94 const static struct iffam gFamilies[] = {
  95         { AF_INET,      NG_IFACE_HOOK_INET      },
  96         { AF_INET6,     NG_IFACE_HOOK_INET6     },
  97         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
  98         { AF_IPX,       NG_IFACE_HOOK_IPX       },
  99         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 100         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 101         { AF_NS,        NG_IFACE_HOOK_NS        },
 102 };
 103 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
 104
 105 /* Node private data */
 106 struct ng_iface_private {
 107         struct  ifnet *ifp;             /* Our interface */
 108         int     unit;                   /* Interface unit number */
 109         node_p  node;                   /* Our netgraph node */
 110         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 111 };
 112 typedef struct ng_iface_private *priv_p;
 113
 114 /* Interface methods */
 115 static void     ng_iface_start(struct ifnet *ifp);
 116 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
 117                         struct ucred *cr);
 118 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 119                         struct sockaddr *dst, struct rtentry *rt0);
 120 static void     ng_iface_bpftap(struct ifnet *ifp,
 121                         struct mbuf *m, sa_family_t family);
 122 #ifdef DEBUG
 123 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 124 #endif
 125
 126 /* Netgraph methods */
 127 static ng_constructor_t ng_iface_constructor;
 128 static ng_rcvmsg_t      ng_iface_rcvmsg;
 129 static ng_shutdown_t    ng_iface_rmnode;
 130 static ng_newhook_t     ng_iface_newhook;
 131 static ng_rcvdata_t     ng_iface_rcvdata;
 132 static ng_disconnect_t  ng_iface_disconnect;
 133
 134 /* Helper stuff */
 135 static iffam_p  get_iffam_from_af(sa_family_t family);
 136 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 137 static iffam_p  get_iffam_from_name(const char *name);
 138 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 139
 140 /* Parse type for struct ng_iface_ifname */
 141 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = {
 142         NG_IFACE_IFACE_NAME_MAX + 1
 143 };
 144 static const struct ng_parse_type ng_iface_ifname_type = {
 145         &ng_parse_fixedstring_type,
 146         &ng_iface_ifname_info
 147 };
 148
 149 /* Parse type for struct ng_cisco_ipaddr */
 150 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 151         = NG_CISCO_IPADDR_TYPE_INFO;
 152 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 153         &ng_parse_struct_type,
 154         &ng_cisco_ipaddr_type_fields
 155 };
 156
 157 /* List of commands and how to convert arguments to/from ASCII */
 158 static const struct ng_cmdlist ng_iface_cmds[] = {
 159         {
 160           NGM_IFACE_COOKIE,
 161           NGM_IFACE_GET_IFNAME,
 162           "getifname",
 163           NULL,
 164           &ng_iface_ifname_type
 165         },
 166         {
 167           NGM_IFACE_COOKIE,
 168           NGM_IFACE_POINT2POINT,
 169           "point2point",
 170           NULL,
 171           NULL
 172         },
 173         {
 174           NGM_IFACE_COOKIE,
 175           NGM_IFACE_BROADCAST,
 176           "broadcast",
 177           NULL,
 178           NULL
 179         },
 180         {
 181           NGM_CISCO_COOKIE,
 182           NGM_CISCO_GET_IPADDR,
 183           "getipaddr",
 184           NULL,
 185           &ng_cisco_ipaddr_type
 186         },
 187         { 0 }
 188 };
 189
 190 /* Node type descriptor */
 191 static struct ng_type typestruct = {
 192         NG_VERSION,
 193         NG_IFACE_NODE_TYPE,
 194         NULL,
 195         ng_iface_constructor,
 196         ng_iface_rcvmsg,
 197         ng_iface_rmnode,
 198         ng_iface_newhook,
 199         NULL,
 200         NULL,
 201         ng_iface_rcvdata,
 202         ng_iface_rcvdata,
 203         ng_iface_disconnect,
 204         ng_iface_cmds
 205 };
 206 NETGRAPH_INIT(iface, &typestruct);
 207
 208 /* We keep a bitmap indicating which unit numbers are free.
 209    One means the unit number is free, zero means it's taken. */
 210 static int      *ng_iface_units = NULL;
 211 static int      ng_iface_units_len = 0;
 212
 213 #define UNITS_BITSPERWORD       (sizeof(*ng_iface_units) * NBBY)
 214
 215 /************************************************************************
 216                         HELPER STUFF
 217  ************************************************************************/
 218
 219 /*
 220  * Get the family descriptor from the family ID
 221  */
 222 static __inline__ iffam_p
 223 get_iffam_from_af(sa_family_t family)
 224 {
 225         iffam_p iffam;
 226         int k;
 227
 228         for (k = 0; k < NUM_FAMILIES; k++) {
 229                 iffam = &gFamilies[k];
 230                 if (iffam->family == family)
 231                         return (iffam);
 232         }
 233         return (NULL);
 234 }
 235
 236 /*
 237  * Get the family descriptor from the hook
 238  */
 239 static __inline__ iffam_p
 240 get_iffam_from_hook(priv_p priv, hook_p hook)
 241 {
 242         int k;
 243
 244         for (k = 0; k < NUM_FAMILIES; k++)
 245                 if (priv->hooks[k] == hook)
 246                         return (&gFamilies[k]);
 247         return (NULL);
 248 }
 249
 250 /*
 251  * Get the hook from the iffam descriptor
 252  */
 253
 254 static __inline__ hook_p *
 255 get_hook_from_iffam(priv_p priv, iffam_p iffam)
 256 {
 257         return (&priv->hooks[iffam - gFamilies]);
 258 }
 259
 260 /*
 261  * Get the iffam descriptor from the name
 262  */
 263 static __inline__ iffam_p
 264 get_iffam_from_name(const char *name)
 265 {
 266         iffam_p iffam;
 267         int k;
 268
 269         for (k = 0; k < NUM_FAMILIES; k++) {
 270                 iffam = &gFamilies[k];
 271                 if (!strcmp(iffam->hookname, name))
 272                         return (iffam);
 273         }
 274         return (NULL);
 275 }
 276
 277 /*
 278  * Find the first free unit number for a new interface.
 279  * Increase the size of the unit bitmap as necessary.
 280  */
 281 static __inline__ int
 282 ng_iface_get_unit(int *unit)
 283 {
 284         int index, bit;
 285
 286         for (index = 0; index < ng_iface_units_len
 287             && ng_iface_units[index] == 0; index++);
 288         if (index == ng_iface_units_len) {              /* extend array */
 289                 int i, *newarray, newlen;
 290
 291                 newlen = (2 * ng_iface_units_len) + 4;
 292                 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units),
 293                     M_NETGRAPH, M_NOWAIT);
 294                 if (newarray == NULL)
 295                         return (ENOMEM);
 296                 bcopy(ng_iface_units, newarray,
 297                     ng_iface_units_len * sizeof(*ng_iface_units));
 298                 for (i = ng_iface_units_len; i < newlen; i++)
 299                         newarray[i] = ~0;
 300                 if (ng_iface_units != NULL)
 301                         FREE(ng_iface_units, M_NETGRAPH);
 302                 ng_iface_units = newarray;
 303                 ng_iface_units_len = newlen;
 304         }
 305         bit = ffs(ng_iface_units[index]) - 1;
 306         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
 307             ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit));
 308         ng_iface_units[index] &= ~(1 << bit);
 309         *unit = (index * UNITS_BITSPERWORD) + bit;
 310         return (0);
 311 }
 312
 313 /*
 314  * Free a no longer needed unit number.
 315  */
 316 static __inline__ void
 317 ng_iface_free_unit(int unit)
 318 {
 319         int index, bit;
 320
 321         index = unit / UNITS_BITSPERWORD;
 322         bit = unit % UNITS_BITSPERWORD;
 323         KASSERT(index < ng_iface_units_len,
 324             ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len));
 325         KASSERT((ng_iface_units[index] & (1 << bit)) == 0,
 326             ("%s: unit=%d is free", __func__, unit));
 327         ng_iface_units[index] |= (1 << bit);
 328         /*
 329          * XXX We could think about reducing the size of ng_iface_units[]
 330          * XXX here if the last portion is all ones
 331          */
 332 }
 333
 334 /************************************************************************
 335                         INTERFACE STUFF
 336  ************************************************************************/
 337
 338 /*
 339  * Process an ioctl for the virtual interface
 340  */
 341 static int
 342 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data,
 343     struct ucred *cr)
 344 {
 345         struct ifreq *const ifr = (struct ifreq *) data;
 346         int error = 0;
 347
 348 #ifdef DEBUG
 349         ng_iface_print_ioctl(ifp, command, data);
 350 #endif
 351         crit_enter();
 352         switch (command) {
 353
 354         /* These two are mostly handled at a higher layer */
 355         case SIOCSIFADDR:
 356                 ifp->if_flags |= (IFF_UP | IFF_RUNNING);
 357                 ifp->if_flags &= ~(IFF_OACTIVE);
 358                 break;
 359         case SIOCGIFADDR:
 360                 break;
 361
 362         /* Set flags */
 363         case SIOCSIFFLAGS:
 364                 /*
 365                  * If the interface is marked up and stopped, then start it.
 366                  * If it is marked down and running, then stop it.
 367                  */
 368                 if (ifr->ifr_flags & IFF_UP) {
 369                         if (!(ifp->if_flags & IFF_RUNNING)) {
 370                                 ifp->if_flags &= ~(IFF_OACTIVE);
 371                                 ifp->if_flags |= IFF_RUNNING;
 372                         }
 373                 } else {
 374                         if (ifp->if_flags & IFF_RUNNING)
 375                                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
 376                 }
 377                 break;
 378
 379         /* Set the interface MTU */
 380         case SIOCSIFMTU:
 381                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 382                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 383                         error = EINVAL;
 384                 else
 385                         ifp->if_mtu = ifr->ifr_mtu;
 386                 break;
 387
 388         /* Stuff that's not supported */
 389         case SIOCADDMULTI:
 390         case SIOCDELMULTI:
 391                 error = 0;
 392                 break;
 393         case SIOCSIFPHYS:
 394                 error = EOPNOTSUPP;
 395                 break;
 396
 397         default:
 398                 error = EINVAL;
 399                 break;
 400         }
 401         crit_exit();
 402         return (error);
 403 }
 404
 405 /*
 406  * This routine is called to deliver a packet out the interface.
 407  * We simply look at the address family and relay the packet to
 408  * the corresponding hook, if it exists and is connected.
 409  */
 410
 411 static int
 412 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 413                 struct sockaddr *dst, struct rtentry *rt0)
 414 {
 415         const priv_p priv = (priv_p) ifp->if_softc;
 416         const iffam_p iffam = get_iffam_from_af(dst->sa_family);
 417         meta_p meta = NULL;
 418         int len, error = 0;
 419
 420         /* Check interface flags */
 421         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 422                 m_freem(m);
 423                 return (ENETDOWN);
 424         }
 425
 426         /* BPF writes need to be handled specially */
 427         if (dst->sa_family == AF_UNSPEC) {
 428                 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL)
 429                         return (ENOBUFS);
 430                 dst->sa_family = (sa_family_t)*mtod(m, int32_t *);
 431                 m->m_data += 4;
 432                 m->m_len -= 4;
 433                 m->m_pkthdr.len -= 4;
 434         }
 435
 436         /* Berkeley packet filter */
 437         ng_iface_bpftap(ifp, m, dst->sa_family);
 438
 439         /* Check address family to determine hook (if known) */
 440         if (iffam == NULL) {
 441                 m_freem(m);
 442                 log(LOG_WARNING, "%s: can't handle af%d\n",
 443                        ifp->if_xname, (int)dst->sa_family);
 444                 return (EAFNOSUPPORT);
 445         }
 446
 447         /* Copy length before the mbuf gets invalidated */
 448         len = m->m_pkthdr.len;
 449
 450         /* Send packet; if hook is not connected, mbuf will get freed. */
 451         NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta);
 452
 453         /* Update stats */
 454         if (error == 0) {
 455                 ifp->if_obytes += len;
 456                 ifp->if_opackets++;
 457         }
 458         return (error);
 459 }
 460
 461 /*
 462  * This routine should never be called
 463  */
 464
 465 static void
 466 ng_iface_start(struct ifnet *ifp)
 467 {
 468         kprintf("%s: %s called?", ifp->if_xname, __func__);
 469 }
 470
 471 /*
 472  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 473  */
 474 static void
 475 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 476 {
 477         int32_t family4 = (int32_t)family;
 478
 479         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 480
 481         if (ifp->if_bpf)
 482                 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4));
 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 *nodep)
 529 {
 530         char ifname[NG_IFACE_IFACE_NAME_MAX + 1];
 531         struct ifnet *ifp;
 532         node_p node;
 533         priv_p priv;
 534         int error = 0;
 535
 536         /* Allocate node and interface private structures */
 537         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
 538         if (priv == NULL)
 539                 return (ENOMEM);
 540         bzero(priv, sizeof(*priv));
 541         MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH, M_NOWAIT);
 542         if (ifp == NULL) {
 543                 FREE(priv, M_NETGRAPH);
 544                 return (ENOMEM);
 545         }
 546         bzero(ifp, sizeof(*ifp));
 547
 548         /* Link them together */
 549         ifp->if_softc = priv;
 550         priv->ifp = ifp;
 551
 552         /* Get an interface unit number */
 553         if ((error = ng_iface_get_unit(&priv->unit)) != 0) {
 554                 FREE(ifp, M_NETGRAPH);
 555                 FREE(priv, M_NETGRAPH);
 556                 return (error);
 557         }
 558
 559         /* Call generic node constructor */
 560         if ((error = ng_make_node_common(&typestruct, nodep)) != 0) {
 561                 ng_iface_free_unit(priv->unit);
 562                 FREE(ifp, M_NETGRAPH);
 563                 FREE(priv, M_NETGRAPH);
 564                 return (error);
 565         }
 566         node = *nodep;
 567
 568         /* Link together node and private info */
 569         node->private = priv;
 570         priv->node = node;
 571
 572         /* Initialize interface structure */
 573         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 574         ifp->if_output = ng_iface_output;
 575         ifp->if_start = ng_iface_start;
 576         ifp->if_ioctl = ng_iface_ioctl;
 577         ifp->if_watchdog = NULL;
 578         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 579         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 580         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 581         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 582         ifp->if_addrlen = 0;                    /* XXX */
 583         ifp->if_hdrlen = 0;                     /* XXX */
 584         ifp->if_baudrate = 64000;               /* XXX */
 585         TAILQ_INIT(&ifp->if_addrhead);
 586
 587         /* Give this node the same name as the interface (if possible) */
 588         bzero(ifname, sizeof(ifname));
 589         strlcpy(ifname, ifp->if_xname, sizeof(ifname));
 590         if (ng_name_node(node, ifname) != 0)
 591                 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
 592
 593         /* Attach the interface */
 594         if_attach(ifp, NULL);
 595         bpfattach(ifp, DLT_NULL, sizeof(u_int));
 596
 597         /* Done */
 598         return (0);
 599 }
 600
 601 /*
 602  * Give our ok for a hook to be added
 603  */
 604 static int
 605 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 606 {
 607         const iffam_p iffam = get_iffam_from_name(name);
 608         hook_p *hookptr;
 609
 610         if (iffam == NULL)
 611                 return (EPFNOSUPPORT);
 612         hookptr = get_hook_from_iffam((priv_p) node->private, iffam);
 613         if (*hookptr != NULL)
 614                 return (EISCONN);
 615         *hookptr = hook;
 616         return (0);
 617 }
 618
 619 /*
 620  * Receive a control message
 621  */
 622 static int
 623 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg,
 624                 const char *retaddr, struct ng_mesg **rptr)
 625 {
 626         const priv_p priv = node->private;
 627         struct ifnet *const ifp = priv->ifp;
 628         struct ng_mesg *resp = NULL;
 629         int error = 0;
 630
 631         switch (msg->header.typecookie) {
 632         case NGM_IFACE_COOKIE:
 633                 switch (msg->header.cmd) {
 634                 case NGM_IFACE_GET_IFNAME:
 635                     {
 636                         struct ng_iface_ifname *arg;
 637
 638                         NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
 639                         if (resp == NULL) {
 640                                 error = ENOMEM;
 641                                 break;
 642                         }
 643                         arg = (struct ng_iface_ifname *)resp->data;
 644                         strlcpy(arg->ngif_name, ifp->if_xname,
 645                             sizeof(arg->ngif_name));
 646                         break;
 647                     }
 648
 649                 case NGM_IFACE_POINT2POINT:
 650                 case NGM_IFACE_BROADCAST:
 651                     {
 652
 653                         /* Deny request if interface is UP */
 654                         if ((ifp->if_flags & IFF_UP) != 0)
 655                                 return (EBUSY);
 656
 657                         /* Change flags */
 658                         switch (msg->header.cmd) {
 659                         case NGM_IFACE_POINT2POINT:
 660                                 ifp->if_flags |= IFF_POINTOPOINT;
 661                                 ifp->if_flags &= ~IFF_BROADCAST;
 662                                 break;
 663                         case NGM_IFACE_BROADCAST:
 664                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 665                                 ifp->if_flags |= IFF_BROADCAST;
 666                                 break;
 667                         }
 668                         break;
 669                     }
 670
 671                 default:
 672                         error = EINVAL;
 673                         break;
 674                 }
 675                 break;
 676         case NGM_CISCO_COOKIE:
 677                 switch (msg->header.cmd) {
 678                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 679                     {
 680                         struct ifaddr *ifa;
 681
 682                         /* Return the first configured IP address */
 683                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 684                                 struct ng_cisco_ipaddr *ips;
 685
 686                                 if (ifa->ifa_addr->sa_family != AF_INET)
 687                                         continue;
 688                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
 689                                 if (resp == NULL) {
 690                                         error = ENOMEM;
 691                                         break;
 692                                 }
 693                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 694                                 ips->ipaddr = ((struct sockaddr_in *)
 695                                                 ifa->ifa_addr)->sin_addr;
 696                                 ips->netmask = ((struct sockaddr_in *)
 697                                                 ifa->ifa_netmask)->sin_addr;
 698                                 break;
 699                         }
 700
 701                         /* No IP addresses on this interface? */
 702                         if (ifa == NULL)
 703                                 error = EADDRNOTAVAIL;
 704                         break;
 705                     }
 706                 default:
 707                         error = EINVAL;
 708                         break;
 709                 }
 710                 break;
 711         default:
 712                 error = EINVAL;
 713                 break;
 714         }
 715         if (rptr)
 716                 *rptr = resp;
 717         else if (resp)
 718                 FREE(resp, M_NETGRAPH);
 719         FREE(msg, M_NETGRAPH);
 720         return (error);
 721 }
 722
 723 /*
 724  * Recive data from a hook. Pass the packet to the correct input routine.
 725  */
 726 static int
 727 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
 728 {
 729         const priv_p priv = hook->node->private;
 730         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 731         struct ifnet *const ifp = priv->ifp;
 732         int isr;
 733
 734         /* Sanity checks */
 735         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 736         KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
 737         if (m == NULL)
 738                 return (EINVAL);
 739         if ((ifp->if_flags & IFF_UP) == 0) {
 740                 NG_FREE_DATA(m, meta);
 741                 return (ENETDOWN);
 742         }
 743
 744         /* Update interface stats */
 745         ifp->if_ipackets++;
 746         ifp->if_ibytes += m->m_pkthdr.len;
 747
 748         /* Note receiving interface */
 749         m->m_pkthdr.rcvif = ifp;
 750
 751         /* Berkeley packet filter */
 752         ng_iface_bpftap(ifp, m, iffam->family);
 753
 754         /* Ignore any meta-data */
 755         NG_FREE_META(meta);
 756
 757         /* Send packet */
 758         switch (iffam->family) {
 759 #ifdef INET
 760         case AF_INET:
 761                 isr = NETISR_IP;
 762                 break;
 763 #endif
 764 #ifdef INET6
 765         case AF_INET6:
 766                 isr = NETISR_IPV6;
 767                 break;
 768 #endif
 769 #ifdef IPX
 770         case AF_IPX:
 771                 isr = NETISR_IPX;
 772                 break;
 773 #endif
 774 #ifdef NETATALK
 775         case AF_APPLETALK:
 776                 isr = NETISR_ATALK2;
 777                 break;
 778 #endif
 779         default:
 780                 m_freem(m);
 781                 return (EAFNOSUPPORT);
 782         }
 783         netisr_dispatch(isr, m);
 784         return (0);
 785 }
 786
 787 /*
 788  * Shutdown and remove the node and its associated interface.
 789  */
 790 static int
 791 ng_iface_rmnode(node_p node)
 792 {
 793         const priv_p priv = node->private;
 794
 795         ng_cutlinks(node);
 796         ng_unname(node);
 797         bpfdetach(priv->ifp);
 798         if_detach(priv->ifp);
 799         FREE(priv->ifp, M_NETGRAPH);
 800         priv->ifp = NULL;
 801         ng_iface_free_unit(priv->unit);
 802         FREE(priv, M_NETGRAPH);
 803         node->private = NULL;
 804         ng_unref(node);
 805         return (0);
 806 }
 807
 808 /*
 809  * Hook disconnection. Note that we do *not* shutdown when all
 810  * hooks have been disconnected.
 811  */
 812 static int
 813 ng_iface_disconnect(hook_p hook)
 814 {
 815         const priv_p priv = hook->node->private;
 816         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 817
 818         if (iffam == NULL)
 819                 panic(__func__);
 820         *get_hook_from_iffam(priv, iffam) = NULL;
 821         return (0);
 822 }
 823