sys/netgraph7/atm/ng_atm.c

   1 /*-
   2  * Copyright (c) 2001-2003
   3  *      Fraunhofer Institute for Open Communication Systems (FhG Fokus).
   4  *      All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * Author: Hartmut Brandt <harti@freebsd.org>
  28  *
  29  * $FreeBSD: src/sys/netgraph/atm/ng_atm.c,v 1.15 2005/08/10 06:25:40 obrien Exp $
  30  */
  31
  32 /*
  33  * Netgraph module to connect NATM interfaces to netgraph.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/errno.h>
  41 #include <sys/syslog.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44 #include <sys/sbuf.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_types.h>
  49 #include <net/if_arp.h>
  50 #include <net/if_var.h>
  51 #include <net/if_media.h>
  52 #include <net/if_atm.h>
  53
  54 #include "ng_message.h"
  55 #include "netgraph.h"
  56 #include "ng_parse.h"
  57 #include "atm/ng_atm.h"
  58
  59 /*
  60  * Hooks in the NATM code
  61  */
  62 extern void     (*ng_atm_attach_p)(struct ifnet *);
  63 extern void     (*ng_atm_detach_p)(struct ifnet *);
  64 extern int      (*ng_atm_output_p)(struct ifnet *, struct mbuf **);
  65 extern void     (*ng_atm_input_p)(struct ifnet *, struct mbuf **,
  66                     struct atm_pseudohdr *, void *);
  67 extern void     (*ng_atm_input_orphan_p)(struct ifnet *, struct mbuf *,
  68                     struct atm_pseudohdr *, void *);
  69 extern void     (*ng_atm_event_p)(struct ifnet *, uint32_t, void *);
  70
  71 /*
  72  * Sysctl stuff.
  73  */
  74 SYSCTL_NODE(_net_graph, OID_AUTO, atm, CTLFLAG_RW, 0, "atm related stuff");
  75
  76 #ifdef NGATM_DEBUG
  77 static int allow_shutdown;
  78
  79 SYSCTL_INT(_net_graph_atm, OID_AUTO, allow_shutdown, CTLFLAG_RW,
  80     &allow_shutdown, 0, "allow ng_atm nodes to shutdown");
  81 #endif
  82
  83 /*
  84  * Hook private data
  85  */
  86 struct ngvcc {
  87         uint16_t        vpi;    /* VPI of this hook */
  88         uint16_t        vci;    /* VCI of this hook, 0 if none */
  89         uint32_t        flags;  /* private flags */
  90         hook_p          hook;   /* the connected hook */
  91
  92         LIST_ENTRY(ngvcc) link;
  93 };
  94 #define VCC_OPEN        0x0001  /* open */
  95
  96 /*
  97  * Node private data
  98  */
  99 struct priv {
 100         struct ifnet    *ifp;           /* the ATM interface */
 101         hook_p          input;          /* raw input hook */
 102         hook_p          orphans;        /* packets to nowhere */
 103         hook_p          output;         /* catch output packets */
 104         hook_p          manage;         /* has also entry in vccs */
 105         uint64_t        in_packets;
 106         uint64_t        in_errors;
 107         uint64_t        out_packets;
 108         uint64_t        out_errors;
 109
 110         LIST_HEAD(, ngvcc) vccs;
 111 };
 112
 113 /*
 114  * Parse ifstate state
 115  */
 116 static const struct ng_parse_struct_field ng_atm_if_change_info[] =
 117     NGM_ATM_IF_CHANGE_INFO;
 118 static const struct ng_parse_type ng_atm_if_change_type = {
 119         &ng_parse_struct_type,
 120         &ng_atm_if_change_info
 121 };
 122
 123 /*
 124  * Parse vcc state change
 125  */
 126 static const struct ng_parse_struct_field ng_atm_vcc_change_info[] =
 127     NGM_ATM_VCC_CHANGE_INFO;
 128 static const struct ng_parse_type ng_atm_vcc_change_type = {
 129         &ng_parse_struct_type,
 130         &ng_atm_vcc_change_info
 131 };
 132
 133 /*
 134  * Parse acr change
 135  */
 136 static const struct ng_parse_struct_field ng_atm_acr_change_info[] =
 137     NGM_ATM_ACR_CHANGE_INFO;
 138 static const struct ng_parse_type ng_atm_acr_change_type = {
 139         &ng_parse_struct_type,
 140         &ng_atm_acr_change_info
 141 };
 142
 143 /*
 144  * Parse the configuration structure ng_atm_config
 145  */
 146 static const struct ng_parse_struct_field ng_atm_config_type_info[] =
 147     NGM_ATM_CONFIG_INFO;
 148
 149 static const struct ng_parse_type ng_atm_config_type = {
 150         &ng_parse_struct_type,
 151         &ng_atm_config_type_info
 152 };
 153
 154 /*
 155  * Parse a single vcc structure and a variable array of these ng_atm_vccs
 156  */
 157 static const struct ng_parse_struct_field ng_atm_tparam_type_info[] =
 158     NGM_ATM_TPARAM_INFO;
 159 static const struct ng_parse_type ng_atm_tparam_type = {
 160         &ng_parse_struct_type,
 161         &ng_atm_tparam_type_info
 162 };
 163 static const struct ng_parse_struct_field ng_atm_vcc_type_info[] =
 164     NGM_ATM_VCC_INFO;
 165 static const struct ng_parse_type ng_atm_vcc_type = {
 166         &ng_parse_struct_type,
 167         &ng_atm_vcc_type_info
 168 };
 169
 170
 171 static int
 172 ng_atm_vccarray_getlen(const struct ng_parse_type *type,
 173         const u_char *start, const u_char *buf)
 174 {
 175         const struct atmio_vcctable *vp;
 176
 177         vp = (const struct atmio_vcctable *)
 178             (buf - offsetof(struct atmio_vcctable, vccs));
 179
 180         return (vp->count);
 181 }
 182 static const struct ng_parse_array_info ng_atm_vccarray_info =
 183     NGM_ATM_VCCARRAY_INFO;
 184 static const struct ng_parse_type ng_atm_vccarray_type = {
 185         &ng_parse_array_type,
 186         &ng_atm_vccarray_info
 187 };
 188
 189
 190 static const struct ng_parse_struct_field ng_atm_vcctable_type_info[] =
 191     NGM_ATM_VCCTABLE_INFO;
 192
 193 static const struct ng_parse_type ng_atm_vcctable_type = {
 194         &ng_parse_struct_type,
 195         &ng_atm_vcctable_type_info
 196 };
 197
 198 /*
 199  * Parse CPCS INIT structure ng_atm_cpcs_init
 200  */
 201 static const struct ng_parse_struct_field ng_atm_cpcs_init_type_info[] =
 202     NGM_ATM_CPCS_INIT_INFO;
 203
 204 static const struct ng_parse_type ng_atm_cpcs_init_type = {
 205         &ng_parse_struct_type,
 206         &ng_atm_cpcs_init_type_info
 207 };
 208
 209 /*
 210  * Parse CPCS TERM structure ng_atm_cpcs_term
 211  */
 212 static const struct ng_parse_struct_field ng_atm_cpcs_term_type_info[] =
 213     NGM_ATM_CPCS_TERM_INFO;
 214
 215 static const struct ng_parse_type ng_atm_cpcs_term_type = {
 216         &ng_parse_struct_type,
 217         &ng_atm_cpcs_term_type_info
 218 };
 219
 220 /*
 221  * Parse statistic struct
 222  */
 223 static const struct ng_parse_struct_field ng_atm_stats_type_info[] =
 224     NGM_ATM_STATS_INFO;
 225
 226 static const struct ng_parse_type ng_atm_stats_type = {
 227         &ng_parse_struct_type,
 228         &ng_atm_stats_type_info
 229 };
 230
 231 static const struct ng_cmdlist ng_atm_cmdlist[] = {
 232         {
 233           NGM_ATM_COOKIE,
 234           NGM_ATM_GET_IFNAME,
 235           "getifname",
 236           NULL,
 237           &ng_parse_string_type
 238         },
 239         {
 240           NGM_ATM_COOKIE,
 241           NGM_ATM_GET_CONFIG,
 242           "getconfig",
 243           NULL,
 244           &ng_atm_config_type
 245         },
 246         {
 247           NGM_ATM_COOKIE,
 248           NGM_ATM_GET_VCCS,
 249           "getvccs",
 250           NULL,
 251           &ng_atm_vcctable_type
 252         },
 253         {
 254           NGM_ATM_COOKIE,
 255           NGM_ATM_CPCS_INIT,
 256           "cpcsinit",
 257           &ng_atm_cpcs_init_type,
 258           NULL
 259         },
 260         {
 261           NGM_ATM_COOKIE,
 262           NGM_ATM_CPCS_TERM,
 263           "cpcsterm",
 264           &ng_atm_cpcs_term_type,
 265           NULL
 266         },
 267         {
 268           NGM_ATM_COOKIE,
 269           NGM_ATM_GET_VCC,
 270           "getvcc",
 271           &ng_parse_hookbuf_type,
 272           &ng_atm_vcc_type
 273         },
 274         {
 275           NGM_ATM_COOKIE,
 276           NGM_ATM_GET_VCCID,
 277           "getvccid",
 278           &ng_atm_vcc_type,
 279           &ng_atm_vcc_type
 280         },
 281         {
 282           NGM_ATM_COOKIE,
 283           NGM_ATM_GET_STATS,
 284           "getstats",
 285           NULL,
 286           &ng_atm_stats_type
 287         },
 288
 289         /* events */
 290         {
 291           NGM_ATM_COOKIE,
 292           NGM_ATM_IF_CHANGE,
 293           "if_change",
 294           &ng_atm_if_change_type,
 295           &ng_atm_if_change_type,
 296         },
 297         {
 298           NGM_ATM_COOKIE,
 299           NGM_ATM_VCC_CHANGE,
 300           "vcc_change",
 301           &ng_atm_vcc_change_type,
 302           &ng_atm_vcc_change_type,
 303         },
 304         {
 305           NGM_ATM_COOKIE,
 306           NGM_ATM_ACR_CHANGE,
 307           "acr_change",
 308           &ng_atm_acr_change_type,
 309           &ng_atm_acr_change_type,
 310         },
 311         { 0 }
 312 };
 313
 314 static int ng_atm_mod_event(module_t, int, void *);
 315
 316 static ng_constructor_t ng_atm_constructor;
 317 static ng_shutdown_t    ng_atm_shutdown;
 318 static ng_rcvmsg_t      ng_atm_rcvmsg;
 319 static ng_newhook_t     ng_atm_newhook;
 320 static ng_connect_t     ng_atm_connect;
 321 static ng_disconnect_t  ng_atm_disconnect;
 322 static ng_rcvdata_t     ng_atm_rcvdata;
 323 static ng_rcvdata_t     ng_atm_rcvdrop;
 324
 325 static struct ng_type ng_atm_typestruct = {
 326         .version =      NG_ABI_VERSION,
 327         .name =         NG_ATM_NODE_TYPE,
 328         .mod_event =    ng_atm_mod_event,
 329         .constructor =  ng_atm_constructor,
 330         .rcvmsg =       ng_atm_rcvmsg,
 331         .shutdown =     ng_atm_shutdown,
 332         .newhook =      ng_atm_newhook,
 333         .connect =      ng_atm_connect,
 334         .rcvdata =      ng_atm_rcvdata,
 335         .disconnect =   ng_atm_disconnect,
 336         .cmdlist =      ng_atm_cmdlist,
 337 };
 338 NETGRAPH_INIT(atm, &ng_atm_typestruct);
 339
 340 static const struct {
 341         u_int   media;
 342         const char *name;
 343 } atmmedia[] = IFM_SUBTYPE_ATM_DESCRIPTIONS;
 344
 345
 346 #define IFP2NG(IFP)     ((node_p)((struct ifatm *)(IFP)->if_softc)->ngpriv)
 347 #define IFP2NG_SET(IFP, val)    (((struct ifatm *)(IFP)->if_softc)->ngpriv = (val))
 348
 349 #define IFFLAGS "\020\001UP\002BROADCAST\003DEBUG\004LOOPBACK" \
 350                  "\005POINTOPOINT\006SMART\007RUNNING\010NOARP" \
 351                  "\011PROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX" \
 352                  "\015LINK0\016LINK1\017LINK2\020MULTICAST"
 353
 354
 355 /************************************************************/
 356 /*
 357  * INPUT
 358  */
 359 /*
 360  * A packet is received from an interface.
 361  * If we have an input hook, prepend the pseudoheader to the data and
 362  * deliver it out to that hook. If not, look whether it is destined for
 363  * use. If so locate the appropriate hook, deliver the packet without the
 364  * header and we are done. If it is not for us, leave it alone.
 365  */
 366 static void
 367 ng_atm_input(struct ifnet *ifp, struct mbuf **mp,
 368         struct atm_pseudohdr *ah, void *rxhand)
 369 {
 370         node_p node = IFP2NG(ifp);
 371         struct priv *priv;
 372         const struct ngvcc *vcc;
 373         int error;
 374
 375         if (node == NULL)
 376                 return;
 377         priv = NG_NODE_PRIVATE(node);
 378         if (priv->input != NULL) {
 379                 /*
 380                  * Prepend the atm_pseudoheader.
 381                  */
 382                 M_PREPEND(*mp, sizeof(*ah), MB_DONTWAIT);
 383                 if (*mp == NULL)
 384                         return;
 385                 memcpy(mtod(*mp, struct atm_pseudohdr *), ah, sizeof(*ah));
 386                 NG_SEND_DATA_ONLY(error, priv->input, *mp);
 387                 if (error == 0) {
 388                         priv->in_packets++;
 389                         *mp = NULL;
 390                 } else {
 391 #ifdef NGATM_DEBUG
 392                         printf("%s: error=%d\n", __func__, error);
 393 #endif
 394                         priv->in_errors++;
 395                 }
 396                 return;
 397         }
 398         if ((ATM_PH_FLAGS(ah) & ATMIO_FLAG_NG) == 0)
 399                 return;
 400
 401         vcc = (struct ngvcc *)rxhand;
 402
 403         NG_SEND_DATA_ONLY(error, vcc->hook, *mp);
 404         if (error == 0) {
 405                 priv->in_packets++;
 406                 *mp = NULL;
 407         } else {
 408 #ifdef NGATM_DEBUG
 409                 printf("%s: error=%d\n", __func__, error);
 410 #endif
 411                 priv->in_errors++;
 412         }
 413 }
 414
 415 /*
 416  * ATM packet is about to be output. The atm_pseudohdr is already prepended.
 417  * If the hook is set, reroute the packet to the hook.
 418  */
 419 static int
 420 ng_atm_output(struct ifnet *ifp, struct mbuf **mp)
 421 {
 422         const node_p node = IFP2NG(ifp);
 423         const struct priv *priv;
 424         int error = 0;
 425
 426         if (node == NULL)
 427                 return (0);
 428         priv = NG_NODE_PRIVATE(node);
 429         if (priv->output) {
 430                 NG_SEND_DATA_ONLY(error, priv->output, *mp);
 431                 *mp = NULL;
 432         }
 433
 434         return (error);
 435 }
 436
 437 /*
 438  * Well, this doesn't make much sense for ATM.
 439  */
 440 static void
 441 ng_atm_input_orphans(struct ifnet *ifp, struct mbuf *m,
 442         struct atm_pseudohdr *ah, void *rxhand)
 443 {
 444         node_p node = IFP2NG(ifp);
 445         struct priv *priv;
 446         int error;
 447
 448         if (node == NULL) {
 449                 m_freem(m);
 450                 return;
 451         }
 452         priv = NG_NODE_PRIVATE(node);
 453         if (priv->orphans == NULL) {
 454                 m_freem(m);
 455                 return;
 456         }
 457         /*
 458          * Prepend the atm_pseudoheader.
 459          */
 460         M_PREPEND(m, sizeof(*ah), MB_DONTWAIT);
 461         if (m == NULL)
 462                 return;
 463         memcpy(mtod(m, struct atm_pseudohdr *), ah, sizeof(*ah));
 464         NG_SEND_DATA_ONLY(error, priv->orphans, m);
 465         if (error == 0)
 466                 priv->in_packets++;
 467         else {
 468                 priv->in_errors++;
 469 #ifdef NGATM_DEBUG
 470                 printf("%s: error=%d\n", __func__, error);
 471 #endif
 472         }
 473 }
 474
 475 /************************************************************/
 476 /*
 477  * OUTPUT
 478  */
 479 static int
 480 ng_atm_rcvdata(hook_p hook, item_p item)
 481 {
 482         node_p node = NG_HOOK_NODE(hook);
 483         struct priv *priv = NG_NODE_PRIVATE(node);
 484         const struct ngvcc *vcc = NG_HOOK_PRIVATE(hook);
 485         struct mbuf *m;
 486         struct atm_pseudohdr *aph;
 487         int error;
 488
 489         if (vcc->vci == 0) {
 490                 NG_FREE_ITEM(item);
 491                 return (ENOTCONN);
 492         }
 493
 494         NGI_GET_M(item, m);
 495         NG_FREE_ITEM(item);
 496
 497         /*
 498          * Prepend pseudo-hdr. Drivers don't care about the flags.
 499          */
 500         M_PREPEND(m, sizeof(*aph), MB_DONTWAIT);
 501         if (m == NULL) {
 502                 NG_FREE_M(m);
 503                 return (ENOMEM);
 504         }
 505         aph = mtod(m, struct atm_pseudohdr *);
 506         ATM_PH_VPI(aph) = vcc->vpi;
 507         ATM_PH_SETVCI(aph, vcc->vci);
 508         ATM_PH_FLAGS(aph) = 0;
 509
 510         if ((error = atm_output(priv->ifp, m, NULL, NULL)) == 0)
 511                 priv->out_packets++;
 512         else
 513                 priv->out_errors++;
 514         return (error);
 515 }
 516
 517 static int
 518 ng_atm_rcvdrop(hook_p hook, item_p item)
 519 {
 520         NG_FREE_ITEM(item);
 521         return (0);
 522 }
 523
 524
 525 /************************************************************
 526  *
 527  * Event from driver.
 528  */
 529 static void
 530 ng_atm_event_func(node_p node, hook_p hook, void *arg, int event)
 531 {
 532         const struct priv *priv = NG_NODE_PRIVATE(node);
 533         struct ngvcc *vcc;
 534         struct ng_mesg *mesg;
 535         int error;
 536
 537         switch (event) {
 538
 539           case ATMEV_FLOW_CONTROL:
 540             {
 541                 struct atmev_flow_control *ev = arg;
 542
 543                 /* find the connection */
 544                 LIST_FOREACH(vcc, &priv->vccs, link)
 545                         if (vcc->vci == ev->vci && vcc->vpi == ev->vpi)
 546                                 break;
 547                 if (vcc == NULL)
 548                         break;
 549
 550                 /* convert into a flow control message */
 551                 NG_MKMESSAGE(mesg, NGM_FLOW_COOKIE,
 552                     ev->busy ? NGM_HIGH_WATER_PASSED : NGM_LOW_WATER_PASSED,
 553                     sizeof(struct ngm_queue_state), M_WAITOK | M_NULLOK);
 554                 if (mesg == NULL)
 555                         break;
 556
 557                 /* XXX have to figure out how to get that info */
 558
 559                 NG_SEND_MSG_HOOK(error, node, mesg, vcc->hook, 0);
 560                 break;
 561             }
 562
 563           case ATMEV_VCC_CHANGED:
 564             {
 565                 struct atmev_vcc_changed *ev = arg;
 566                 struct ngm_atm_vcc_change *chg;
 567
 568                 if (priv->manage == NULL)
 569                         break;
 570                 NG_MKMESSAGE(mesg, NGM_ATM_COOKIE, NGM_ATM_VCC_CHANGE,
 571                     sizeof(struct ngm_atm_vcc_change), M_WAITOK | M_NULLOK);
 572                 if (mesg == NULL)
 573                         break;
 574                 chg = (struct ngm_atm_vcc_change *)mesg->data;
 575                 chg->vci = ev->vci;
 576                 chg->vpi = ev->vpi;
 577                 chg->state = (ev->up != 0);
 578                 chg->node = NG_NODE_ID(node);
 579                 NG_SEND_MSG_HOOK(error, node, mesg, priv->manage, 0);
 580                 break;
 581             }
 582
 583           case ATMEV_IFSTATE_CHANGED:
 584             {
 585                 struct atmev_ifstate_changed *ev = arg;
 586                 struct ngm_atm_if_change *chg;
 587
 588                 if (priv->manage == NULL)
 589                         break;
 590                 NG_MKMESSAGE(mesg, NGM_ATM_COOKIE, NGM_ATM_IF_CHANGE,
 591                     sizeof(struct ngm_atm_if_change), M_WAITOK | M_NULLOK);
 592                 if (mesg == NULL)
 593                         break;
 594                 chg = (struct ngm_atm_if_change *)mesg->data;
 595                 chg->carrier = (ev->carrier != 0);
 596                 chg->running = (ev->running != 0);
 597                 chg->node = NG_NODE_ID(node);
 598                 NG_SEND_MSG_HOOK(error, node, mesg, priv->manage, 0);
 599                 break;
 600             }
 601
 602           case ATMEV_ACR_CHANGED:
 603             {
 604                 struct atmev_acr_changed *ev = arg;
 605                 struct ngm_atm_acr_change *acr;
 606
 607                 /* find the connection */
 608                 LIST_FOREACH(vcc, &priv->vccs, link)
 609                         if (vcc->vci == ev->vci && vcc->vpi == ev->vpi)
 610                                 break;
 611                 if (vcc == NULL)
 612                         break;
 613
 614                 /* convert into a flow control message */
 615                 NG_MKMESSAGE(mesg, NGM_ATM_COOKIE, NGM_ATM_ACR_CHANGE,
 616                     sizeof(struct ngm_atm_acr_change), M_WAITOK | M_NULLOK);
 617                 if (mesg == NULL)
 618                         break;
 619                 acr = (struct ngm_atm_acr_change *)mesg->data;
 620                 acr->node = NG_NODE_ID(node);
 621                 acr->vci = ev->vci;
 622                 acr->vpi = ev->vpi;
 623                 acr->acr = ev->acr;
 624
 625                 NG_SEND_MSG_HOOK(error, node, mesg, vcc->hook, 0);
 626                 break;
 627             }
 628         }
 629 }
 630
 631 /*
 632  * Use send_fn to get the right lock
 633  */
 634 static void
 635 ng_atm_event(struct ifnet *ifp, uint32_t event, void *arg)
 636 {
 637         const node_p node = IFP2NG(ifp);
 638
 639         if (node != NULL)
 640                 /* may happen during attach/detach */
 641                 (void)ng_send_fn(node, NULL, ng_atm_event_func, arg, event);
 642 }
 643
 644 /************************************************************
 645  *
 646  * CPCS
 647  */
 648 /*
 649  * Open a channel for the user
 650  */
 651 static int
 652 ng_atm_cpcs_init(node_p node, const struct ngm_atm_cpcs_init *arg)
 653 {
 654         struct priv *priv = NG_NODE_PRIVATE(node);
 655         struct ngvcc *vcc;
 656         struct atmio_openvcc data;
 657         int err;
 658
 659         if(priv->ifp->if_ioctl == NULL)
 660                 return (ENXIO);
 661
 662         LIST_FOREACH(vcc, &priv->vccs, link)
 663                 if (strcmp(arg->name, NG_HOOK_NAME(vcc->hook)) == 0)
 664                         break;
 665         if (vcc == NULL)
 666                 return (ENOTCONN);
 667         if (vcc->flags & VCC_OPEN)
 668                 return (EISCONN);
 669
 670         /*
 671          * Check user arguments and construct ioctl argument
 672          */
 673         memset(&data, 0, sizeof(data));
 674
 675         data.rxhand = vcc;
 676
 677         switch (data.param.aal = arg->aal) {
 678
 679           case ATMIO_AAL_34:
 680           case ATMIO_AAL_5:
 681           case ATMIO_AAL_0:
 682           case ATMIO_AAL_RAW:
 683                 break;
 684
 685           default:
 686                 return (EINVAL);
 687         }
 688
 689         if (arg->vpi > 0xff)
 690                 return (EINVAL);
 691         data.param.vpi = arg->vpi;
 692
 693         /* allow 0.0 as catch all receive channel */
 694         if (arg->vci == 0 && (arg->vpi != 0 || !(arg->flags & ATMIO_FLAG_NOTX)))
 695                 return (EINVAL);
 696         data.param.vci = arg->vci;
 697
 698         data.param.tparam.pcr = arg->pcr;
 699
 700         if (arg->mcr > arg->pcr)
 701                 return (EINVAL);
 702         data.param.tparam.mcr = arg->mcr;
 703
 704         if (!(arg->flags & ATMIO_FLAG_NOTX)) {
 705                 if (arg->tmtu == 0)
 706                         data.param.tmtu = priv->ifp->if_mtu;
 707                 else {
 708                         data.param.tmtu = arg->tmtu;
 709                 }
 710         }
 711         if (!(arg->flags & ATMIO_FLAG_NORX)) {
 712                 if (arg->rmtu == 0)
 713                         data.param.rmtu = priv->ifp->if_mtu;
 714                 else {
 715                         data.param.rmtu = arg->rmtu;
 716                 }
 717         }
 718
 719         switch (data.param.traffic = arg->traffic) {
 720
 721           case ATMIO_TRAFFIC_UBR:
 722           case ATMIO_TRAFFIC_CBR:
 723                 break;
 724
 725           case ATMIO_TRAFFIC_VBR:
 726                 if (arg->scr > arg->pcr)
 727                         return (EINVAL);
 728                 data.param.tparam.scr = arg->scr;
 729
 730                 if (arg->mbs > (1 << 24))
 731                         return (EINVAL);
 732                 data.param.tparam.mbs = arg->mbs;
 733                 break;
 734
 735           case ATMIO_TRAFFIC_ABR:
 736                 if (arg->icr > arg->pcr || arg->icr < arg->mcr)
 737                         return (EINVAL);
 738                 data.param.tparam.icr = arg->icr;
 739
 740                 if (arg->tbe == 0 || arg->tbe > (1 << 24))
 741                         return (EINVAL);
 742                 data.param.tparam.tbe = arg->tbe;
 743
 744                 if (arg->nrm > 0x7)
 745                         return (EINVAL);
 746                 data.param.tparam.nrm = arg->nrm;
 747
 748                 if (arg->trm > 0x7)
 749                         return (EINVAL);
 750                 data.param.tparam.trm = arg->trm;
 751
 752                 if (arg->adtf > 0x3ff)
 753                         return (EINVAL);
 754                 data.param.tparam.adtf = arg->adtf;
 755
 756                 if (arg->rif > 0xf)
 757                         return (EINVAL);
 758                 data.param.tparam.rif = arg->rif;
 759
 760                 if (arg->rdf > 0xf)
 761                         return (EINVAL);
 762                 data.param.tparam.rdf = arg->rdf;
 763
 764                 if (arg->cdf > 0x7)
 765                         return (EINVAL);
 766                 data.param.tparam.cdf = arg->cdf;
 767
 768                 break;
 769
 770           default:
 771                 return (EINVAL);
 772         }
 773
 774         if ((arg->flags & ATMIO_FLAG_NORX) && (arg->flags & ATMIO_FLAG_NOTX))
 775                 return (EINVAL);
 776
 777         data.param.flags = arg->flags & ~(ATM_PH_AAL5 | ATM_PH_LLCSNAP);
 778         data.param.flags |= ATMIO_FLAG_NG;
 779
 780         err = (*priv->ifp->if_ioctl)(priv->ifp, SIOCATMOPENVCC, (caddr_t)&data);
 781
 782         if (err == 0) {
 783                 vcc->vci = data.param.vci;
 784                 vcc->vpi = data.param.vpi;
 785                 vcc->flags = VCC_OPEN;
 786         }
 787
 788         return (err);
 789 }
 790
 791 /*
 792  * Issue the close command to the driver
 793  */
 794 static int
 795 cpcs_term(const struct priv *priv, u_int vpi, u_int vci)
 796 {
 797         struct atmio_closevcc data;
 798
 799         if (priv->ifp->if_ioctl == NULL)
 800                 return ENXIO;
 801
 802         data.vpi = vpi;
 803         data.vci = vci;
 804
 805         return ((*priv->ifp->if_ioctl)(priv->ifp,
 806             SIOCATMCLOSEVCC, (caddr_t)&data));
 807 }
 808
 809
 810 /*
 811  * Close a channel by request of the user
 812  */
 813 static int
 814 ng_atm_cpcs_term(node_p node, const struct ngm_atm_cpcs_term *arg)
 815 {
 816         struct priv *priv = NG_NODE_PRIVATE(node);
 817         struct ngvcc *vcc;
 818         int error;
 819
 820         LIST_FOREACH(vcc, &priv->vccs, link)
 821                 if(strcmp(arg->name, NG_HOOK_NAME(vcc->hook)) == 0)
 822                         break;
 823         if (vcc == NULL)
 824                 return (ENOTCONN);
 825         if (!(vcc->flags & VCC_OPEN))
 826                 return (ENOTCONN);
 827
 828         error = cpcs_term(priv, vcc->vpi, vcc->vci);
 829
 830         vcc->vci = 0;
 831         vcc->vpi = 0;
 832         vcc->flags = 0;
 833
 834         return (error);
 835 }
 836
 837 /************************************************************/
 838 /*
 839  * CONTROL MESSAGES
 840  */
 841
 842 /*
 843  * Produce a textual description of the current status
 844  */
 845 static int
 846 text_status(node_p node, char *arg, u_int len)
 847 {
 848         const struct priv *priv = NG_NODE_PRIVATE(node);
 849         const struct ifatm_mib *mib;
 850         struct sbuf sbuf;
 851         u_int i;
 852
 853         static const struct {
 854                 const char      *name;
 855                 const char      *vendor;
 856         } devices[] = {
 857                 ATM_DEVICE_NAMES
 858         };
 859
 860         mib = (const struct ifatm_mib *)(priv->ifp->if_linkmib);
 861
 862         sbuf_new(&sbuf, arg, len, SBUF_FIXEDLEN);
 863         sbuf_printf(&sbuf, "interface: %s\n", priv->ifp->if_xname);
 864
 865         if (mib->device >= NELEM(devices))
 866                 sbuf_printf(&sbuf, "device=unknown\nvendor=unknown\n");
 867         else
 868                 sbuf_printf(&sbuf, "device=%s\nvendor=%s\n",
 869                     devices[mib->device].name, devices[mib->device].vendor);
 870
 871         for (i = 0; atmmedia[i].name; i++)
 872                 if(mib->media == atmmedia[i].media) {
 873                         sbuf_printf(&sbuf, "media=%s\n", atmmedia[i].name);
 874                         break;
 875                 }
 876         if(atmmedia[i].name == NULL)
 877                 sbuf_printf(&sbuf, "media=unknown\n");
 878
 879         sbuf_printf(&sbuf, "serial=%u esi=%s hardware=%u software=%u\n",
 880             mib->serial, ether_sprintf(mib->esi), mib->hw_version, mib->sw_version);
 881         sbuf_printf(&sbuf, "pcr=%u vpi_bits=%u vci_bits=%u max_vpcs=%u "
 882             "max_vccs=%u\n", mib->pcr, mib->vpi_bits, mib->vci_bits,
 883             mib->max_vpcs, mib->max_vccs);
 884         sbuf_printf(&sbuf, "ifflags=%b\n", priv->ifp->if_flags, IFFLAGS);
 885
 886         sbuf_finish(&sbuf);
 887
 888         return (sbuf_len(&sbuf));
 889 }
 890
 891 /*
 892  * Get control message
 893  */
 894 static int
 895 ng_atm_rcvmsg(node_p node, item_p item, hook_p lasthook)
 896 {
 897         const struct priv *priv = NG_NODE_PRIVATE(node);
 898         struct ng_mesg *resp = NULL;
 899         struct ng_mesg *msg;
 900         struct ifatm_mib *mib = (struct ifatm_mib *)(priv->ifp->if_linkmib);
 901         int error = 0;
 902
 903         NGI_GET_MSG(item, msg);
 904
 905         switch (msg->header.typecookie) {
 906
 907           case NGM_GENERIC_COOKIE:
 908                 switch (msg->header.cmd) {
 909
 910                   case NGM_TEXT_STATUS:
 911                         NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_WAITOK | M_NULLOK);
 912                         if(resp == NULL) {
 913                                 error = ENOMEM;
 914                                 break;
 915                         }
 916
 917                         resp->header.arglen = text_status(node,
 918                             (char *)resp->data, resp->header.arglen) + 1;
 919                         break;
 920
 921                   default:
 922                         error = EINVAL;
 923                         break;
 924                 }
 925                 break;
 926
 927           case NGM_ATM_COOKIE:
 928                 switch (msg->header.cmd) {
 929
 930                   case NGM_ATM_GET_IFNAME:
 931                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
 932                         if (resp == NULL) {
 933                                 error = ENOMEM;
 934                                 break;
 935                         }
 936                         strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
 937                         break;
 938
 939                   case NGM_ATM_GET_CONFIG:
 940                     {
 941                         struct ngm_atm_config *config;
 942
 943                         NG_MKRESPONSE(resp, msg, sizeof(*config), M_WAITOK | M_NULLOK);
 944                         if (resp == NULL) {
 945                                 error = ENOMEM;
 946                                 break;
 947                         }
 948                         config = (struct ngm_atm_config *)resp->data;
 949                         config->pcr = mib->pcr;
 950                         config->vpi_bits = mib->vpi_bits;
 951                         config->vci_bits = mib->vci_bits;
 952                         config->max_vpcs = mib->max_vpcs;
 953                         config->max_vccs = mib->max_vccs;
 954                         break;
 955                     }
 956
 957                   case NGM_ATM_GET_VCCS:
 958                     {
 959                         struct atmio_vcctable *vccs;
 960                         size_t len;
 961
 962                         if (priv->ifp->if_ioctl == NULL) {
 963                                 error = ENXIO;
 964                                 break;
 965                         }
 966                         error = (*priv->ifp->if_ioctl)(priv->ifp,
 967                             SIOCATMGETVCCS, (caddr_t)&vccs);
 968                         if (error)
 969                                 break;
 970
 971                         len = sizeof(*vccs) +
 972                             vccs->count * sizeof(vccs->vccs[0]);
 973                         NG_MKRESPONSE(resp, msg, len, M_WAITOK | M_NULLOK);
 974                         if (resp == NULL) {
 975                                 error = ENOMEM;
 976                                 kfree(vccs, M_DEVBUF);
 977                                 break;
 978                         }
 979
 980                         (void)memcpy(resp->data, vccs, len);
 981                         kfree(vccs, M_DEVBUF);
 982
 983                         break;
 984                     }
 985
 986                   case NGM_ATM_GET_VCC:
 987                     {
 988                         char hook[NG_HOOKSIZ];
 989                         struct atmio_vcctable *vccs;
 990                         struct ngvcc *vcc;
 991                         u_int i;
 992
 993                         if (priv->ifp->if_ioctl == NULL) {
 994                                 error = ENXIO;
 995                                 break;
 996                         }
 997                         if (msg->header.arglen != NG_HOOKSIZ) {
 998                                 error = EINVAL;
 999                                 break;
1000                         }
1001                         strncpy(hook, msg->data, NG_HOOKSIZ);
1002                         hook[NG_HOOKSIZ - 1] = '\0';
1003                         LIST_FOREACH(vcc, &priv->vccs, link)
1004                                 if (strcmp(NG_HOOK_NAME(vcc->hook), hook) == 0)
1005                                         break;
1006                         if (vcc == NULL) {
1007                                 error = ENOTCONN;
1008                                 break;
1009                         }
1010                         error = (*priv->ifp->if_ioctl)(priv->ifp,
1011                             SIOCATMGETVCCS, (caddr_t)&vccs);
1012                         if (error)
1013                                 break;
1014
1015                         for (i = 0; i < vccs->count; i++)
1016                                 if (vccs->vccs[i].vpi == vcc->vpi &&
1017                                     vccs->vccs[i].vci == vcc->vci)
1018                                         break;
1019                         if (i == vccs->count) {
1020                                 error = ENOTCONN;
1021                                 kfree(vccs, M_DEVBUF);
1022                                 break;
1023                         }
1024
1025                         NG_MKRESPONSE(resp, msg, sizeof(vccs->vccs[0]),
1026                             M_WAITOK | M_NULLOK);
1027                         if (resp == NULL) {
1028                                 error = ENOMEM;
1029                                 kfree(vccs, M_DEVBUF);
1030                                 break;
1031                         }
1032
1033                         *(struct atmio_vcc *)resp->data = vccs->vccs[i];
1034                         kfree(vccs, M_DEVBUF);
1035                         break;
1036                     }
1037
1038                   case NGM_ATM_GET_VCCID:
1039                     {
1040                         struct atmio_vcc *arg;
1041                         struct atmio_vcctable *vccs;
1042                         u_int i;
1043
1044                         if (priv->ifp->if_ioctl == NULL) {
1045                                 error = ENXIO;
1046                                 break;
1047                         }
1048                         if (msg->header.arglen != sizeof(*arg)) {
1049                                 error = EINVAL;
1050                                 break;
1051                         }
1052                         arg = (struct atmio_vcc *)msg->data;
1053
1054                         error = (*priv->ifp->if_ioctl)(priv->ifp,
1055                             SIOCATMGETVCCS, (caddr_t)&vccs);
1056                         if (error)
1057                                 break;
1058
1059                         for (i = 0; i < vccs->count; i++)
1060                                 if (vccs->vccs[i].vpi == arg->vpi &&
1061                                     vccs->vccs[i].vci == arg->vci)
1062                                         break;
1063                         if (i == vccs->count) {
1064                                 error = ENOTCONN;
1065                                 kfree(vccs, M_DEVBUF);
1066                                 break;
1067                         }
1068
1069                         NG_MKRESPONSE(resp, msg, sizeof(vccs->vccs[0]),
1070                             M_WAITOK | M_NULLOK);
1071                         if (resp == NULL) {
1072                                 error = ENOMEM;
1073                                 kfree(vccs, M_DEVBUF);
1074                                 break;
1075                         }
1076
1077                         *(struct atmio_vcc *)resp->data = vccs->vccs[i];
1078                         kfree(vccs, M_DEVBUF);
1079                         break;
1080                     }
1081
1082                   case NGM_ATM_CPCS_INIT:
1083                         if (msg->header.arglen !=
1084                             sizeof(struct ngm_atm_cpcs_init)) {
1085                                 error = EINVAL;
1086                                 break;
1087                         }
1088                         error = ng_atm_cpcs_init(node,
1089                             (struct ngm_atm_cpcs_init *)msg->data);
1090                         break;
1091
1092                   case NGM_ATM_CPCS_TERM:
1093                         if (msg->header.arglen !=
1094                             sizeof(struct ngm_atm_cpcs_term)) {
1095                                 error = EINVAL;
1096                                 break;
1097                         }
1098                         error = ng_atm_cpcs_term(node,
1099                             (struct ngm_atm_cpcs_term *)msg->data);
1100                         break;
1101
1102                   case NGM_ATM_GET_STATS:
1103                     {
1104                         struct ngm_atm_stats *p;
1105
1106                         if (msg->header.arglen != 0) {
1107                                 error = EINVAL;
1108                                 break;
1109                         }
1110                         NG_MKRESPONSE(resp, msg, sizeof(*p), M_WAITOK | M_NULLOK);
1111                         if (resp == NULL) {
1112                                 error = ENOMEM;
1113                                 break;
1114                         }
1115                         p = (struct ngm_atm_stats *)resp->data;
1116                         p->in_packets = priv->in_packets;
1117                         p->out_packets = priv->out_packets;
1118                         p->in_errors = priv->in_errors;
1119                         p->out_errors = priv->out_errors;
1120
1121                         break;
1122                     }
1123
1124                   default:
1125                         error = EINVAL;
1126                         break;
1127                 }
1128                 break;
1129
1130           default:
1131                 error = EINVAL;
1132                 break;
1133         }
1134
1135         NG_RESPOND_MSG(error, node, item, resp);
1136         NG_FREE_MSG(msg);
1137         return (error);
1138 }
1139
1140 /************************************************************/
1141 /*
1142  * HOOK MANAGEMENT
1143  */
1144
1145 /*
1146  * A new hook is create that will be connected to the node.
1147  * Check, whether the name is one of the predefined ones.
1148  * If not, create a new entry into the vcc list.
1149  */
1150 static int
1151 ng_atm_newhook(node_p node, hook_p hook, const char *name)
1152 {
1153         struct priv *priv = NG_NODE_PRIVATE(node);
1154         struct ngvcc *vcc;
1155
1156         if (strcmp(name, "input") == 0) {
1157                 priv->input = hook;
1158                 NG_HOOK_SET_RCVDATA(hook, ng_atm_rcvdrop);
1159                 return (0);
1160         }
1161         if (strcmp(name, "output") == 0) {
1162                 priv->output = hook;
1163                 NG_HOOK_SET_RCVDATA(hook, ng_atm_rcvdrop);
1164                 return (0);
1165         }
1166         if (strcmp(name, "orphans") == 0) {
1167                 priv->orphans = hook;
1168                 NG_HOOK_SET_RCVDATA(hook, ng_atm_rcvdrop);
1169                 return (0);
1170         }
1171
1172         /*
1173          * Allocate a new entry
1174          */
1175         vcc = kmalloc(sizeof(*vcc), M_NETGRAPH, M_WAITOK | M_NULLOK | M_ZERO);
1176         if (vcc == NULL)
1177                 return (ENOMEM);
1178
1179         vcc->hook = hook;
1180         NG_HOOK_SET_PRIVATE(hook, vcc);
1181
1182         LIST_INSERT_HEAD(&priv->vccs, vcc, link);
1183
1184         if (strcmp(name, "manage") == 0)
1185                 priv->manage = hook;
1186
1187         return (0);
1188 }
1189
1190 /*
1191  * Connect. Set the peer to queuing.
1192  */
1193 static int
1194 ng_atm_connect(hook_p hook)
1195 {
1196         if (NG_HOOK_PRIVATE(hook) != NULL)
1197                 NG_HOOK_FORCE_QUEUE(NG_HOOK_PEER(hook));
1198
1199         return (0);
1200 }
1201
1202 /*
1203  * Disconnect a HOOK
1204  */
1205 static int
1206 ng_atm_disconnect(hook_p hook)
1207 {
1208         struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
1209         struct ngvcc *vcc = NG_HOOK_PRIVATE(hook);
1210
1211         if (vcc == NULL) {
1212                 if (hook == priv->output) {
1213                         priv->output = NULL;
1214                         return (0);
1215                 }
1216                 if (hook == priv->input) {
1217                         priv->input = NULL;
1218                         return (0);
1219                 }
1220                 if (hook == priv->orphans) {
1221                         priv->orphans = NULL;
1222                         return (0);
1223                 }
1224                 log(LOG_ERR, "ng_atm: bad hook '%s'", NG_HOOK_NAME(hook));
1225                 return (0);
1226         }
1227
1228         /* don't terminate if we are detaching from the interface */
1229         if ((vcc->flags & VCC_OPEN) && priv->ifp != NULL)
1230                 (void)cpcs_term(priv, vcc->vpi, vcc->vci);
1231
1232         NG_HOOK_SET_PRIVATE(hook, NULL);
1233
1234         LIST_REMOVE(vcc, link);
1235         kfree(vcc, M_NETGRAPH);
1236
1237         if (hook == priv->manage)
1238                 priv->manage = NULL;
1239
1240         return (0);
1241 }
1242
1243 /************************************************************/
1244 /*
1245  * NODE MANAGEMENT
1246  */
1247
1248 /*
1249  * ATM interface attached - create a node and name it like the interface.
1250  */
1251 static void
1252 ng_atm_attach(struct ifnet *ifp)
1253 {
1254         node_p node;
1255         struct priv *priv;
1256
1257         KASSERT(IFP2NG(ifp) == 0, ("%s: node alreay exists?", __func__));
1258
1259         if (ng_make_node_common(&ng_atm_typestruct, &node) != 0) {
1260                 log(LOG_ERR, "%s: can't create node for %s\n",
1261                     __func__, ifp->if_xname);
1262                 return;
1263         }
1264
1265         priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_NULLOK | M_ZERO);
1266         if (priv == NULL) {
1267                 log(LOG_ERR, "%s: can't allocate memory for %s\n",
1268                     __func__, ifp->if_xname);
1269                 NG_NODE_UNREF(node);
1270                 return;
1271         }
1272         NG_NODE_SET_PRIVATE(node, priv);
1273         priv->ifp = ifp;
1274         LIST_INIT(&priv->vccs);
1275         IFP2NG_SET(ifp, node);
1276
1277         if (ng_name_node(node, ifp->if_xname) != 0) {
1278                 log(LOG_WARNING, "%s: can't name node %s\n",
1279                     __func__, ifp->if_xname);
1280         }
1281 }
1282
1283 /*
1284  * ATM interface detached - destroy node.
1285  */
1286 static void
1287 ng_atm_detach(struct ifnet *ifp)
1288 {
1289         const node_p node = IFP2NG(ifp);
1290         struct priv *priv;
1291
1292         if(node == NULL)
1293                 return;
1294
1295         NG_NODE_REALLY_DIE(node);
1296
1297         priv = NG_NODE_PRIVATE(node);
1298         IFP2NG_SET(priv->ifp, NULL);
1299         priv->ifp = NULL;
1300
1301         ng_rmnode_self(node);
1302 }
1303
1304 /*
1305  * Shutdown the node. This is called from the shutdown message processing.
1306  */
1307 static int
1308 ng_atm_shutdown(node_p node)
1309 {
1310         struct priv *priv = NG_NODE_PRIVATE(node);
1311
1312         if (node->nd_flags & NGF_REALLY_DIE) {
1313                 /*
1314                  * We are called from unloading the ATM driver. Really,
1315                  * really need to shutdown this node. The ifp was
1316                  * already handled in the detach routine.
1317                  */
1318                 NG_NODE_SET_PRIVATE(node, NULL);
1319                 kfree(priv, M_NETGRAPH);
1320
1321                 NG_NODE_UNREF(node);
1322                 return (0);
1323         }
1324
1325 #ifdef NGATM_DEBUG
1326         if (!allow_shutdown)
1327                 NG_NODE_REVIVE(node);           /* we persist */
1328         else {
1329                 IFP2NG_SET(priv->ifp, NULL);
1330                 NG_NODE_SET_PRIVATE(node, NULL);
1331                 kfree(priv, M_NETGRAPH);
1332                 NG_NODE_UNREF(node);
1333         }
1334 #else
1335         /*
1336          * We are persistant - reinitialize
1337          */
1338         NG_NODE_REVIVE(node);
1339 #endif
1340         return (0);
1341 }
1342
1343 /*
1344  * Nodes are constructed only via interface attaches.
1345  */
1346 static int
1347 ng_atm_constructor(node_p nodep)
1348 {
1349         return (EINVAL);
1350 }
1351
1352 /************************************************************/
1353 /*
1354  * INITIALISATION
1355  */
1356 /*
1357  * Loading and unloading of node type
1358  *
1359  * The assignments to the globals for the hooks should be ok without
1360  * a special hook. The use pattern is generally: check that the pointer
1361  * is not NULL, call the function. In the attach case this is no problem.
1362  * In the detach case we can detach only when no ATM node exists. That
1363  * means that there is no ATM interface anymore. So we are sure that
1364  * we are not in the code path in if_atmsubr.c. To prevent someone
1365  * from adding an interface after we have started to unload the node, we
1366  * take the iflist lock so an if_attach will be blocked until we are done.
1367  * XXX: perhaps the function pointers should be 'volatile' for this to work
1368  * properly.
1369  */
1370 static int
1371 ng_atm_mod_event(module_t mod, int event, void *data)
1372 {
1373         struct ifnet *ifp;
1374         int error = 0;
1375
1376         switch (event) {
1377
1378           case MOD_LOAD:
1379                 /*
1380                  * Register function hooks
1381                  */
1382                 if (ng_atm_attach_p != NULL) {
1383                         error = EEXIST;
1384                         break;
1385                 }
1386                 IFNET_RLOCK();
1387
1388                 ng_atm_attach_p = ng_atm_attach;
1389                 ng_atm_detach_p = ng_atm_detach;
1390                 ng_atm_output_p = ng_atm_output;
1391                 ng_atm_input_p = ng_atm_input;
1392                 ng_atm_input_orphan_p = ng_atm_input_orphans;
1393                 ng_atm_event_p = ng_atm_event;
1394
1395                 /* Create nodes for existing ATM interfaces */
1396                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1397                         if (ifp->if_type == IFT_ATM)
1398                                 ng_atm_attach(ifp);
1399                 }
1400                 IFNET_RUNLOCK();
1401                 break;
1402
1403           case MOD_UNLOAD:
1404                 IFNET_RLOCK();
1405
1406                 ng_atm_attach_p = NULL;
1407                 ng_atm_detach_p = NULL;
1408                 ng_atm_output_p = NULL;
1409                 ng_atm_input_p = NULL;
1410                 ng_atm_input_orphan_p = NULL;
1411                 ng_atm_event_p = NULL;
1412
1413                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1414                         if (ifp->if_type == IFT_ATM)
1415                                 ng_atm_detach(ifp);
1416                 }
1417                 IFNET_RUNLOCK();
1418                 break;
1419
1420           default:
1421                 error = EOPNOTSUPP;
1422                 break;
1423         }
1424         return (error);
1425 }