sys/netgraph7/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: src/sys/netgraph/ng_iface.c,v 1.48 2008/01/31 08:51:48 mav Exp $
  41  * $DragonFly: src/sys/netgraph7/ng_iface.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
  42  * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
  43  */
  44
  45 /*
  46  * This node is also a system networking interface. It has
  47  * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
  48  * are simply relayed between the interface and the hooks.
  49  *
  50  * Interfaces are named ng0, ng1, etc.  New nodes take the
  51  * first available interface name.
  52  *
  53  * This node also includes Berkeley packet filter support.
  54  */
  55
  56 #include "opt_atalk.h"
  57 #include "opt_inet.h"
  58 #include "opt_inet6.h"
  59 #include "opt_ipx.h"
  60
  61 #include <sys/param.h>
  62 #include <sys/systm.h>
  63 #include <sys/errno.h>
  64 #include <sys/kernel.h>
  65 #include <sys/malloc.h>
  66 #include <sys/mbuf.h>
  67 #include <sys/errno.h>
  68 #include <sys/random.h>
  69 #include <sys/sockio.h>
  70 #include <sys/socket.h>
  71 #include <sys/syslog.h>
  72 #include <sys/libkern.h>
  73
  74 #include <net/if.h>
  75 #include <net/if_types.h>
  76 #include <net/bpf.h>
  77 #include <net/netisr.h>
  78
  79 #include <netinet/in.h>
  80
  81 #include "ng_message.h"
  82 #include "netgraph.h"
  83 #include "ng_parse.h"
  84 #include "ng_iface.h"
  85 #include "ng_cisco.h"
  86
  87 #ifdef NG_SEPARATE_MALLOC
  88 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
  89 #else
  90 #define M_NETGRAPH_IFACE M_NETGRAPH
  91 #endif
  92
  93 /* This struct describes one address family */
  94 struct iffam {
  95         sa_family_t     family;         /* Address family */
  96         const char      *hookname;      /* Name for hook */
  97 };
  98 typedef const struct iffam *iffam_p;
  99
 100 /* List of address families supported by our interface */
 101 const static struct iffam gFamilies[] = {
 102         { AF_INET,      NG_IFACE_HOOK_INET      },
 103         { AF_INET6,     NG_IFACE_HOOK_INET6     },
 104         { AF_APPLETALK, NG_IFACE_HOOK_ATALK     },
 105         { AF_IPX,       NG_IFACE_HOOK_IPX       },
 106         { AF_ATM,       NG_IFACE_HOOK_ATM       },
 107         { AF_NATM,      NG_IFACE_HOOK_NATM      },
 108 };
 109 #define NUM_FAMILIES            (sizeof(gFamilies) / sizeof(*gFamilies))
 110
 111 /* Node private data */
 112 struct ng_iface_private {
 113         struct  ifnet *ifp;             /* Our interface */
 114         int     unit;                   /* Interface unit number */
 115         node_p  node;                   /* Our netgraph node */
 116         hook_p  hooks[NUM_FAMILIES];    /* Hook for each address family */
 117 };
 118 typedef struct ng_iface_private *priv_p;
 119
 120 /* Interface methods */
 121 static void     ng_iface_start(struct ifnet *ifp);
 122 static int      ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
 123 static int      ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
 124                         struct sockaddr *dst, struct rtentry *rt0);
 125 static void     ng_iface_bpftap(struct ifnet *ifp,
 126                         struct mbuf *m, sa_family_t family);
 127 static int      ng_iface_send(struct ifnet *ifp, struct mbuf *m,
 128                         sa_family_t sa);
 129 #ifdef DEBUG
 130 static void     ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
 131 #endif
 132
 133 /* Netgraph methods */
 134 static int              ng_iface_mod_event(module_t, int, void *);
 135 static ng_constructor_t ng_iface_constructor;
 136 static ng_rcvmsg_t      ng_iface_rcvmsg;
 137 static ng_shutdown_t    ng_iface_shutdown;
 138 static ng_newhook_t     ng_iface_newhook;
 139 static ng_rcvdata_t     ng_iface_rcvdata;
 140 static ng_disconnect_t  ng_iface_disconnect;
 141
 142 /* Helper stuff */
 143 static iffam_p  get_iffam_from_af(sa_family_t family);
 144 static iffam_p  get_iffam_from_hook(priv_p priv, hook_p hook);
 145 static iffam_p  get_iffam_from_name(const char *name);
 146 static hook_p  *get_hook_from_iffam(priv_p priv, iffam_p iffam);
 147
 148 /* Parse type for struct ng_cisco_ipaddr */
 149 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 150         = NG_CISCO_IPADDR_TYPE_INFO;
 151 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 152         &ng_parse_struct_type,
 153         &ng_cisco_ipaddr_type_fields
 154 };
 155
 156 /* List of commands and how to convert arguments to/from ASCII */
 157 static const struct ng_cmdlist ng_iface_cmds[] = {
 158         {
 159           NGM_IFACE_COOKIE,
 160           NGM_IFACE_GET_IFNAME,
 161           "getifname",
 162           NULL,
 163           &ng_parse_string_type
 164         },
 165         {
 166           NGM_IFACE_COOKIE,
 167           NGM_IFACE_POINT2POINT,
 168           "point2point",
 169           NULL,
 170           NULL
 171         },
 172         {
 173           NGM_IFACE_COOKIE,
 174           NGM_IFACE_BROADCAST,
 175           "broadcast",
 176           NULL,
 177           NULL
 178         },
 179         {
 180           NGM_CISCO_COOKIE,
 181           NGM_CISCO_GET_IPADDR,
 182           "getipaddr",
 183           NULL,
 184           &ng_cisco_ipaddr_type
 185         },
 186         {
 187           NGM_IFACE_COOKIE,
 188           NGM_IFACE_GET_IFINDEX,
 189           "getifindex",
 190           NULL,
 191           &ng_parse_uint32_type
 192         },
 193         { 0 }
 194 };
 195
 196 /* Node type descriptor */
 197 static struct ng_type typestruct = {
 198         .version =      NG_ABI_VERSION,
 199         .name =         NG_IFACE_NODE_TYPE,
 200         .mod_event =    ng_iface_mod_event,
 201         .constructor =  ng_iface_constructor,
 202         .rcvmsg =       ng_iface_rcvmsg,
 203         .shutdown =     ng_iface_shutdown,
 204         .newhook =      ng_iface_newhook,
 205         .rcvdata =      ng_iface_rcvdata,
 206         .disconnect =   ng_iface_disconnect,
 207         .cmdlist =      ng_iface_cmds,
 208 };
 209 NETGRAPH_INIT(iface, &typestruct);
 210
 211 static struct unrhdr    *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 s, error = 0;
 287
 288 #ifdef DEBUG
 289         ng_iface_print_ioctl(ifp, command, data);
 290 #endif
 291         s = splimp();
 292         switch (command) {
 293
 294         /* These two are mostly handled at a higher layer */
 295         case SIOCSIFADDR:
 296                 ifp->if_flags |= IFF_UP;
 297                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 298                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 299                 break;
 300         case SIOCGIFADDR:
 301                 break;
 302
 303         /* Set flags */
 304         case SIOCSIFFLAGS:
 305                 /*
 306                  * If the interface is marked up and stopped, then start it.
 307                  * If it is marked down and running, then stop it.
 308                  */
 309                 if (ifr->ifr_flags & IFF_UP) {
 310                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 311                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 312                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 313                         }
 314                 } else {
 315                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 316                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 317                                     IFF_DRV_OACTIVE);
 318                 }
 319                 break;
 320
 321         /* Set the interface MTU */
 322         case SIOCSIFMTU:
 323                 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
 324                     || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
 325                         error = EINVAL;
 326                 else
 327                         ifp->if_mtu = ifr->ifr_mtu;
 328                 break;
 329
 330         /* Stuff that's not supported */
 331         case SIOCADDMULTI:
 332         case SIOCDELMULTI:
 333                 error = 0;
 334                 break;
 335         case SIOCSIFPHYS:
 336                 error = EOPNOTSUPP;
 337                 break;
 338
 339         default:
 340                 error = EINVAL;
 341                 break;
 342         }
 343         (void) splx(s);
 344         return (error);
 345 }
 346
 347 /*
 348  * This routine is called to deliver a packet out the interface.
 349  * We simply look at the address family and relay the packet to
 350  * the corresponding hook, if it exists and is connected.
 351  */
 352
 353 static int
 354 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
 355                 struct sockaddr *dst, struct rtentry *rt0)
 356 {
 357         uint32_t af;
 358         int error;
 359
 360         /* Check interface flags */
 361         if (!((ifp->if_flags & IFF_UP) &&
 362             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 363                 m_freem(m);
 364                 return (ENETDOWN);
 365         }
 366
 367         /* BPF writes need to be handled specially. */
 368         if (dst->sa_family == AF_UNSPEC) {
 369                 bcopy(dst->sa_data, &af, sizeof(af));
 370                 dst->sa_family = af;
 371         }
 372
 373         /* Berkeley packet filter */
 374         ng_iface_bpftap(ifp, m, dst->sa_family);
 375
 376         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 377                 M_PREPEND(m, sizeof(sa_family_t), MB_DONTWAIT);
 378                 if (m == NULL) {
 379                         IFQ_LOCK(&ifp->if_snd);
 380                         IFQ_INC_DROPS(&ifp->if_snd);
 381                         IFQ_UNLOCK(&ifp->if_snd);
 382                         ifp->if_oerrors++;
 383                         return (ENOBUFS);
 384                 }
 385                 *(sa_family_t *)m->m_data = dst->sa_family;
 386                 IFQ_HANDOFF(ifp, m, error);
 387         } else
 388                 error = ng_iface_send(ifp, m, dst->sa_family);
 389
 390         return (error);
 391 }
 392
 393 /*
 394  * Start method is used only when ALTQ is enabled.
 395  */
 396 static void
 397 ng_iface_start(struct ifnet *ifp)
 398 {
 399         struct mbuf *m;
 400         sa_family_t sa;
 401
 402         KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__));
 403
 404         for(;;) {
 405                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
 406                 if (m == NULL)
 407                         break;
 408                 sa = *mtod(m, sa_family_t *);
 409                 m_adj(m, sizeof(sa_family_t));
 410                 ng_iface_send(ifp, m, sa);
 411         }
 412 }
 413
 414 /*
 415  * Flash a packet by the BPF (requires prepending 4 byte AF header)
 416  * Note the phoney mbuf; this is OK because BPF treats it read-only.
 417  */
 418 static void
 419 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
 420 {
 421         KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
 422         if (bpf_peers_present(ifp->if_bpf)) {
 423                 int32_t family4 = (int32_t)family;
 424                 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m);
 425         }
 426 }
 427
 428 /*
 429  * This routine does actual delivery of the packet into the
 430  * netgraph(4). It is called from ng_iface_start() and
 431  * ng_iface_output().
 432  */
 433 static int
 434 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa)
 435 {
 436         const priv_p priv = (priv_p) ifp->if_softc;
 437         const iffam_p iffam = get_iffam_from_af(sa);
 438         int error;
 439         int len;
 440
 441         /* Check address family to determine hook (if known) */
 442         if (iffam == NULL) {
 443                 m_freem(m);
 444                 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa);
 445                 return (EAFNOSUPPORT);
 446         }
 447
 448         /* Copy length before the mbuf gets invalidated. */
 449         len = m->m_pkthdr.len;
 450
 451         /* Send packet. If hook is not connected,
 452            mbuf will get freed. */
 453         NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m);
 454
 455         /* Update stats. */
 456         if (error == 0) {
 457                 ifp->if_obytes += len;
 458                 ifp->if_opackets++;
 459         }
 460
 461         return (error);
 462 }
 463
 464 #ifdef DEBUG
 465 /*
 466  * Display an ioctl to the virtual interface
 467  */
 468
 469 static void
 470 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 471 {
 472         char   *str;
 473
 474         switch (command & IOC_DIRMASK) {
 475         case IOC_VOID:
 476                 str = "IO";
 477                 break;
 478         case IOC_OUT:
 479                 str = "IOR";
 480                 break;
 481         case IOC_IN:
 482                 str = "IOW";
 483                 break;
 484         case IOC_INOUT:
 485                 str = "IORW";
 486                 break;
 487         default:
 488                 str = "IO??";
 489         }
 490         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 491                ifp->if_xname,
 492                str,
 493                IOCGROUP(command),
 494                command & 0xff,
 495                IOCPARM_LEN(command));
 496 }
 497 #endif /* DEBUG */
 498
 499 /************************************************************************
 500                         NETGRAPH NODE STUFF
 501  ************************************************************************/
 502
 503 /*
 504  * Constructor for a node
 505  */
 506 static int
 507 ng_iface_constructor(node_p node)
 508 {
 509         struct ifnet *ifp;
 510         priv_p priv;
 511
 512         /* Allocate node and interface private structures */
 513         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_NULLOK | M_ZERO);
 514         if (priv == NULL)
 515                 return (ENOMEM);
 516         ifp = if_alloc(IFT_PROPVIRTUAL);
 517         if (ifp == NULL) {
 518                 FREE(priv, M_NETGRAPH_IFACE);
 519                 return (ENOMEM);
 520         }
 521
 522         /* Link them together */
 523         ifp->if_softc = priv;
 524         priv->ifp = ifp;
 525
 526         /* Get an interface unit number */
 527         priv->unit = alloc_unr(ng_iface_unit);
 528
 529         /* Link together node and private info */
 530         NG_NODE_SET_PRIVATE(node, priv);
 531         priv->node = node;
 532
 533         /* Initialize interface structure */
 534         if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit);
 535         ifp->if_output = ng_iface_output;
 536         ifp->if_start = ng_iface_start;
 537         ifp->if_ioctl = ng_iface_ioctl;
 538         ifp->if_watchdog = NULL;
 539         ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
 540         ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
 541         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 542         ifp->if_addrlen = 0;                    /* XXX */
 543         ifp->if_hdrlen = 0;                     /* XXX */
 544         ifp->if_baudrate = 64000;               /* XXX */
 545         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
 546         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
 547         IFQ_SET_READY(&ifp->if_snd);
 548
 549         /* Give this node the same name as the interface (if possible) */
 550         if (ng_name_node(node, ifp->if_xname) != 0)
 551                 log(LOG_WARNING, "%s: can't acquire netgraph name\n",
 552                     ifp->if_xname);
 553
 554         /* Attach the interface */
 555         if_attach(ifp);
 556         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
 557
 558         /* Done */
 559         return (0);
 560 }
 561
 562 /*
 563  * Give our ok for a hook to be added
 564  */
 565 static int
 566 ng_iface_newhook(node_p node, hook_p hook, const char *name)
 567 {
 568         const iffam_p iffam = get_iffam_from_name(name);
 569         hook_p *hookptr;
 570
 571         if (iffam == NULL)
 572                 return (EPFNOSUPPORT);
 573         hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
 574         if (*hookptr != NULL)
 575                 return (EISCONN);
 576         *hookptr = hook;
 577         NG_HOOK_HI_STACK(hook);
 578         return (0);
 579 }
 580
 581 /*
 582  * Receive a control message
 583  */
 584 static int
 585 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 586 {
 587         const priv_p priv = NG_NODE_PRIVATE(node);
 588         struct ifnet *const ifp = priv->ifp;
 589         struct ng_mesg *resp = NULL;
 590         int error = 0;
 591         struct ng_mesg *msg;
 592
 593         NGI_GET_MSG(item, msg);
 594         switch (msg->header.typecookie) {
 595         case NGM_IFACE_COOKIE:
 596                 switch (msg->header.cmd) {
 597                 case NGM_IFACE_GET_IFNAME:
 598                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
 599                         if (resp == NULL) {
 600                                 error = ENOMEM;
 601                                 break;
 602                         }
 603                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 604                         break;
 605
 606                 case NGM_IFACE_POINT2POINT:
 607                 case NGM_IFACE_BROADCAST:
 608                     {
 609
 610                         /* Deny request if interface is UP */
 611                         if ((ifp->if_flags & IFF_UP) != 0)
 612                                 return (EBUSY);
 613
 614                         /* Change flags */
 615                         switch (msg->header.cmd) {
 616                         case NGM_IFACE_POINT2POINT:
 617                                 ifp->if_flags |= IFF_POINTOPOINT;
 618                                 ifp->if_flags &= ~IFF_BROADCAST;
 619                                 break;
 620                         case NGM_IFACE_BROADCAST:
 621                                 ifp->if_flags &= ~IFF_POINTOPOINT;
 622                                 ifp->if_flags |= IFF_BROADCAST;
 623                                 break;
 624                         }
 625                         break;
 626                     }
 627
 628                 case NGM_IFACE_GET_IFINDEX:
 629                         NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_WAITOK | M_NULLOK);
 630                         if (resp == NULL) {
 631                                 error = ENOMEM;
 632                                 break;
 633                         }
 634                         *((uint32_t *)resp->data) = priv->ifp->if_index;
 635                         break;
 636
 637                 default:
 638                         error = EINVAL;
 639                         break;
 640                 }
 641                 break;
 642         case NGM_CISCO_COOKIE:
 643                 switch (msg->header.cmd) {
 644                 case NGM_CISCO_GET_IPADDR:      /* we understand this too */
 645                     {
 646                         struct ifaddr *ifa;
 647
 648                         /* Return the first configured IP address */
 649                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 650                                 struct ng_cisco_ipaddr *ips;
 651
 652                                 if (ifa->ifa_addr->sa_family != AF_INET)
 653                                         continue;
 654                                 NG_MKRESPONSE(resp, msg, sizeof(ips), M_WAITOK | M_NULLOK);
 655                                 if (resp == NULL) {
 656                                         error = ENOMEM;
 657                                         break;
 658                                 }
 659                                 ips = (struct ng_cisco_ipaddr *)resp->data;
 660                                 ips->ipaddr = ((struct sockaddr_in *)
 661                                                 ifa->ifa_addr)->sin_addr;
 662                                 ips->netmask = ((struct sockaddr_in *)
 663                                                 ifa->ifa_netmask)->sin_addr;
 664                                 break;
 665                         }
 666
 667                         /* No IP addresses on this interface? */
 668                         if (ifa == NULL)
 669                                 error = EADDRNOTAVAIL;
 670                         break;
 671                     }
 672                 default:
 673                         error = EINVAL;
 674                         break;
 675                 }
 676                 break;
 677         case NGM_FLOW_COOKIE:
 678                 switch (msg->header.cmd) {
 679                 case NGM_LINK_IS_UP:
 680                         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 681                         break;
 682                 case NGM_LINK_IS_DOWN:
 683                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 684                         break;
 685                 default:
 686                         break;
 687                 }
 688                 break;
 689         default:
 690                 error = EINVAL;
 691                 break;
 692         }
 693         NG_RESPOND_MSG(error, node, item, resp);
 694         NG_FREE_MSG(msg);
 695         return (error);
 696 }
 697
 698 /*
 699  * Recive data from a hook. Pass the packet to the correct input routine.
 700  */
 701 static int
 702 ng_iface_rcvdata(hook_p hook, item_p item)
 703 {
 704         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 705         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 706         struct ifnet *const ifp = priv->ifp;
 707         struct mbuf *m;
 708         int isr;
 709
 710         NGI_GET_M(item, m);
 711         NG_FREE_ITEM(item);
 712         /* Sanity checks */
 713         KASSERT(iffam != NULL, ("%s: iffam", __func__));
 714         M_ASSERTPKTHDR(m);
 715         if ((ifp->if_flags & IFF_UP) == 0) {
 716                 NG_FREE_M(m);
 717                 return (ENETDOWN);
 718         }
 719
 720         /* Update interface stats */
 721         ifp->if_ipackets++;
 722         ifp->if_ibytes += m->m_pkthdr.len;
 723
 724         /* Note receiving interface */
 725         m->m_pkthdr.rcvif = ifp;
 726
 727         /* Berkeley packet filter */
 728         ng_iface_bpftap(ifp, m, iffam->family);
 729
 730         /* Send packet */
 731         switch (iffam->family) {
 732 #ifdef INET
 733         case AF_INET:
 734                 isr = NETISR_IP;
 735                 break;
 736 #endif
 737 #ifdef INET6
 738         case AF_INET6:
 739                 isr = NETISR_IPV6;
 740                 break;
 741 #endif
 742 #ifdef IPX
 743         case AF_IPX:
 744                 isr = NETISR_IPX;
 745                 break;
 746 #endif
 747 #ifdef NETATALK
 748         case AF_APPLETALK:
 749                 isr = NETISR_ATALK2;
 750                 break;
 751 #endif
 752         default:
 753                 m_freem(m);
 754                 return (EAFNOSUPPORT);
 755         }
 756         /* First chunk of an mbuf contains good junk */
 757         if (harvest.point_to_point)
 758                 random_harvest(m, 16, 3, 0, RANDOM_NET);
 759         netisr_dispatch(isr, m);
 760         return (0);
 761 }
 762
 763 /*
 764  * Shutdown and remove the node and its associated interface.
 765  */
 766 static int
 767 ng_iface_shutdown(node_p node)
 768 {
 769         const priv_p priv = NG_NODE_PRIVATE(node);
 770
 771         bpfdetach(priv->ifp);
 772         if_detach(priv->ifp);
 773         if_free(priv->ifp);
 774         priv->ifp = NULL;
 775         free_unr(ng_iface_unit, priv->unit);
 776         FREE(priv, M_NETGRAPH_IFACE);
 777         NG_NODE_SET_PRIVATE(node, NULL);
 778         NG_NODE_UNREF(node);
 779         return (0);
 780 }
 781
 782 /*
 783  * Hook disconnection. Note that we do *not* shutdown when all
 784  * hooks have been disconnected.
 785  */
 786 static int
 787 ng_iface_disconnect(hook_p hook)
 788 {
 789         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 790         const iffam_p iffam = get_iffam_from_hook(priv, hook);
 791
 792         if (iffam == NULL)
 793                 panic(__func__);
 794         *get_hook_from_iffam(priv, iffam) = NULL;
 795         return (0);
 796 }
 797
 798 /*
 799  * Handle loading and unloading for this node type.
 800  */
 801 static int
 802 ng_iface_mod_event(module_t mod, int event, void *data)
 803 {
 804         int error = 0;
 805
 806         switch (event) {
 807         case MOD_LOAD:
 808                 ng_iface_unit = new_unrhdr(0, 0xffff, NULL);
 809                 break;
 810         case MOD_UNLOAD:
 811                 delete_unrhdr(ng_iface_unit);
 812                 break;
 813         default:
 814                 error = EOPNOTSUPP;
 815                 break;
 816         }
 817         return (error);
 818 }