sys/netgraph/ng_cisco.c

   1 /*
   2  * ng_cisco.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: Julian Elischer <julian@freebsd.org>
  39  *
  40  * $FreeBSD$
  41  * $Whistle: ng_cisco.c,v 1.25 1999/11/01 09:24:51 julian Exp $
  42  */
  43
  44 #include <sys/param.h>
  45 #include <sys/systm.h>
  46 #include <sys/errno.h>
  47 #include <sys/kernel.h>
  48 #include <sys/socket.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/syslog.h>
  52
  53 #include <net/if.h>
  54
  55 #include <netinet/in.h>
  56 #include <netinet/if_ether.h>
  57
  58 #include <netatalk/at.h>
  59
  60 #include <netipx/ipx.h>
  61 #include <netipx/ipx_if.h>
  62
  63 #include <netgraph/ng_message.h>
  64 #include <netgraph/netgraph.h>
  65 #include <netgraph/ng_parse.h>
  66 #include <netgraph/ng_cisco.h>
  67
  68 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
  69 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
  70 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
  71 #define CISCO_ADDR_REQ          0       /* Cisco address request */
  72 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
  73 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
  74
  75 #define KEEPALIVE_SECS          10
  76
  77 struct cisco_header {
  78         uint8_t  address;
  79         uint8_t  control;
  80         uint16_t protocol;
  81 } __packed;
  82
  83 #define CISCO_HEADER_LEN        sizeof (struct cisco_header)
  84
  85 struct cisco_packet {
  86         uint32_t type;
  87         uint32_t par1;
  88         uint32_t par2;
  89         uint16_t rel;
  90         uint16_t time0;
  91         uint16_t time1;
  92 } __packed;
  93
  94 #define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
  95
  96 struct protoent {
  97         hook_p  hook;           /* the hook for this proto */
  98         uint16_t af;            /* address family, -1 = downstream */
  99 };
 100
 101 struct cisco_priv {
 102         uint32_t local_seq;
 103         uint32_t remote_seq;
 104         uint32_t seqRetries;    /* how many times we've been here throwing out
 105                                  * the same sequence number without ack */
 106         node_p  node;
 107         struct callout handle;
 108         struct protoent downstream;
 109         struct protoent inet;           /* IP information */
 110         struct in_addr localip;
 111         struct in_addr localmask;
 112         struct protoent inet6;          /* IPv6 information */
 113         struct protoent atalk;          /* AppleTalk information */
 114         struct protoent ipx;            /* IPX information */
 115 };
 116 typedef struct cisco_priv *sc_p;
 117
 118 /* Netgraph methods */
 119 static ng_constructor_t         cisco_constructor;
 120 static ng_rcvmsg_t              cisco_rcvmsg;
 121 static ng_shutdown_t            cisco_shutdown;
 122 static ng_newhook_t             cisco_newhook;
 123 static ng_rcvdata_t             cisco_rcvdata;
 124 static ng_disconnect_t          cisco_disconnect;
 125
 126 /* Other functions */
 127 static int      cisco_input(sc_p sc, item_p item);
 128 static void     cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2);
 129 static int      cisco_send(sc_p sc, int type, long par1, long par2);
 130 static void     cisco_notify(sc_p sc, uint32_t cmd);
 131
 132 /* Parse type for struct ng_cisco_ipaddr */
 133 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 134         = NG_CISCO_IPADDR_TYPE_INFO;
 135 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 136         &ng_parse_struct_type,
 137         &ng_cisco_ipaddr_type_fields
 138 };
 139
 140 /* Parse type for struct ng_async_stat */
 141 static const struct ng_parse_struct_field ng_cisco_stats_type_fields[]
 142         = NG_CISCO_STATS_TYPE_INFO;
 143 static const struct ng_parse_type ng_cisco_stats_type = {
 144         &ng_parse_struct_type,
 145         &ng_cisco_stats_type_fields
 146 };
 147
 148 /* List of commands and how to convert arguments to/from ASCII */
 149 static const struct ng_cmdlist ng_cisco_cmdlist[] = {
 150         {
 151           NGM_CISCO_COOKIE,
 152           NGM_CISCO_SET_IPADDR,
 153           "setipaddr",
 154           &ng_cisco_ipaddr_type,
 155           NULL
 156         },
 157         {
 158           NGM_CISCO_COOKIE,
 159           NGM_CISCO_GET_IPADDR,
 160           "getipaddr",
 161           NULL,
 162           &ng_cisco_ipaddr_type
 163         },
 164         {
 165           NGM_CISCO_COOKIE,
 166           NGM_CISCO_GET_STATUS,
 167           "getstats",
 168           NULL,
 169           &ng_cisco_stats_type
 170         },
 171         { 0 }
 172 };
 173
 174 /* Node type */
 175 static struct ng_type typestruct = {
 176         .version =      NG_ABI_VERSION,
 177         .name =         NG_CISCO_NODE_TYPE,
 178         .constructor =  cisco_constructor,
 179         .rcvmsg =       cisco_rcvmsg,
 180         .shutdown =     cisco_shutdown,
 181         .newhook =      cisco_newhook,
 182         .rcvdata =      cisco_rcvdata,
 183         .disconnect =   cisco_disconnect,
 184         .cmdlist =      ng_cisco_cmdlist,
 185 };
 186 NETGRAPH_INIT(cisco, &typestruct);
 187
 188 /*
 189  * Node constructor
 190  */
 191 static int
 192 cisco_constructor(node_p node)
 193 {
 194         sc_p sc;
 195
 196         sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO);
 197
 198         ng_callout_init(&sc->handle);
 199         NG_NODE_SET_PRIVATE(node, sc);
 200         sc->node = node;
 201
 202         /* Initialise the varous protocol hook holders */
 203         sc->downstream.af = 0xffff;
 204         sc->inet.af = AF_INET;
 205         sc->inet6.af = AF_INET6;
 206         sc->atalk.af = AF_APPLETALK;
 207         sc->ipx.af = AF_IPX;
 208         return (0);
 209 }
 210
 211 /*
 212  * Check new hook
 213  */
 214 static int
 215 cisco_newhook(node_p node, hook_p hook, const char *name)
 216 {
 217         const sc_p sc = NG_NODE_PRIVATE(node);
 218
 219         if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
 220                 sc->downstream.hook = hook;
 221                 NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
 222
 223                 /* Start keepalives */
 224                 ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
 225                     &cisco_keepalive, (void *)sc, 0);
 226         } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
 227                 sc->inet.hook = hook;
 228                 NG_HOOK_SET_PRIVATE(hook, &sc->inet);
 229         } else if (strcmp(name, NG_CISCO_HOOK_INET6) == 0) {
 230                 sc->inet6.hook = hook;
 231                 NG_HOOK_SET_PRIVATE(hook, &sc->inet6);
 232         } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
 233                 sc->atalk.hook = hook;
 234                 NG_HOOK_SET_PRIVATE(hook, &sc->atalk);
 235         } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
 236                 sc->ipx.hook = hook;
 237                 NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
 238         } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
 239                 NG_HOOK_SET_PRIVATE(hook, NULL);        /* unimplemented */
 240         } else
 241                 return (EINVAL);
 242         return 0;
 243 }
 244
 245 /*
 246  * Receive control message.
 247  */
 248 static int
 249 cisco_rcvmsg(node_p node, item_p item, hook_p lasthook)
 250 {
 251         struct ng_mesg *msg;
 252         const sc_p sc = NG_NODE_PRIVATE(node);
 253         struct ng_mesg *resp = NULL;
 254         int error = 0;
 255
 256         NGI_GET_MSG(item, msg);
 257         switch (msg->header.typecookie) {
 258         case NGM_GENERIC_COOKIE:
 259                 switch (msg->header.cmd) {
 260                 case NGM_TEXT_STATUS:
 261                     {
 262                         char *arg;
 263                         int pos;
 264
 265                         NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
 266                         if (resp == NULL) {
 267                                 error = ENOMEM;
 268                                 break;
 269                         }
 270                         arg = (char *) resp->data;
 271                         pos = sprintf(arg,
 272                           "keepalive period: %d sec; ", KEEPALIVE_SECS);
 273                         pos += sprintf(arg + pos,
 274                           "unacknowledged keepalives: %d", sc->seqRetries);
 275                         resp->header.arglen = pos + 1;
 276                         break;
 277                     }
 278                 default:
 279                         error = EINVAL;
 280                         break;
 281                 }
 282                 break;
 283         case NGM_CISCO_COOKIE:
 284                 switch (msg->header.cmd) {
 285                 case NGM_CISCO_GET_IPADDR:      /* could be a late reply! */
 286                         if ((msg->header.flags & NGF_RESP) == 0) {
 287                                 struct in_addr *ips;
 288
 289                                 NG_MKRESPONSE(resp, msg,
 290                                     2 * sizeof(*ips), M_NOWAIT);
 291                                 if (!resp) {
 292                                         error = ENOMEM;
 293                                         break;
 294                                 }
 295                                 ips = (struct in_addr *) resp->data;
 296                                 ips[0] = sc->localip;
 297                                 ips[1] = sc->localmask;
 298                                 break;
 299                         }
 300                         /* FALLTHROUGH */       /* ...if it's a reply */
 301                 case NGM_CISCO_SET_IPADDR:
 302                     {
 303                         struct in_addr *const ips = (struct in_addr *)msg->data;
 304
 305                         if (msg->header.arglen < 2 * sizeof(*ips)) {
 306                                 error = EINVAL;
 307                                 break;
 308                         }
 309                         sc->localip = ips[0];
 310                         sc->localmask = ips[1];
 311                         break;
 312                     }
 313                 case NGM_CISCO_GET_STATUS:
 314                     {
 315                         struct ng_cisco_stats *stat;
 316
 317                         NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
 318                         if (!resp) {
 319                                 error = ENOMEM;
 320                                 break;
 321                         }
 322                         stat = (struct ng_cisco_stats *)resp->data;
 323                         stat->seqRetries = sc->seqRetries;
 324                         stat->keepAlivePeriod = KEEPALIVE_SECS;
 325                         break;
 326                     }
 327                 default:
 328                         error = EINVAL;
 329                         break;
 330                 }
 331                 break;
 332         default:
 333                 error = EINVAL;
 334                 break;
 335         }
 336         NG_RESPOND_MSG(error, node, item, resp);
 337         NG_FREE_MSG(msg);
 338         return (error);
 339 }
 340
 341 /*
 342  * Receive data
 343  */
 344 static int
 345 cisco_rcvdata(hook_p hook, item_p item)
 346 {
 347         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 348         struct protoent *pep;
 349         struct cisco_header *h;
 350         struct mbuf *m;
 351         int error = 0;
 352
 353         if ((pep = NG_HOOK_PRIVATE(hook)) == NULL)
 354                 goto out;
 355
 356         /* If it came from our downlink, deal with it separately */
 357         if (pep->af == 0xffff)
 358                 return (cisco_input(sc, item));
 359
 360         /* OK so it came from a protocol, heading out. Prepend general data
 361            packet header. For now, IP,IPX only  */
 362         NGI_GET_M(item, m);
 363         M_PREPEND(m, CISCO_HEADER_LEN, M_NOWAIT);
 364         if (!m) {
 365                 error = ENOBUFS;
 366                 goto out;
 367         }
 368         NGI_M(item) = m;
 369         h = mtod(m, struct cisco_header *);
 370         h->address = CISCO_UNICAST;
 371         h->control = 0;
 372
 373         switch (pep->af) {
 374         case AF_INET:           /* Internet Protocol */
 375                 h->protocol = htons(ETHERTYPE_IP);
 376                 break;
 377         case AF_INET6:
 378                 h->protocol = htons(ETHERTYPE_IPV6);
 379                 break;
 380         case AF_APPLETALK:      /* AppleTalk Protocol */
 381                 h->protocol = htons(ETHERTYPE_AT);
 382                 break;
 383         case AF_IPX:            /* Novell IPX Protocol */
 384                 h->protocol = htons(ETHERTYPE_IPX);
 385                 break;
 386         default:
 387                 error = EAFNOSUPPORT;
 388                 goto out;
 389         }
 390
 391         /* Send it */
 392         NG_FWD_NEW_DATA(error, item,  sc->downstream.hook, m);
 393         return (error);
 394
 395 out:
 396         NG_FREE_ITEM(item);
 397         return (error);
 398 }
 399
 400 /*
 401  * Shutdown node
 402  */
 403 static int
 404 cisco_shutdown(node_p node)
 405 {
 406         const sc_p sc = NG_NODE_PRIVATE(node);
 407
 408         NG_NODE_SET_PRIVATE(node, NULL);
 409         NG_NODE_UNREF(sc->node);
 410         free(sc, M_NETGRAPH);
 411         return (0);
 412 }
 413
 414 /*
 415  * Disconnection of a hook
 416  *
 417  * For this type, removal of the last link destroys the node
 418  */
 419 static int
 420 cisco_disconnect(hook_p hook)
 421 {
 422         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 423         struct protoent *pep;
 424
 425         /* Check it's not the debug hook */
 426         if ((pep = NG_HOOK_PRIVATE(hook))) {
 427                 pep->hook = NULL;
 428                 if (pep->af == 0xffff)
 429                         /* If it is the downstream hook, stop the timers */
 430                         ng_uncallout(&sc->handle, NG_HOOK_NODE(hook));
 431         }
 432
 433         /* If no more hooks, remove the node */
 434         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
 435         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
 436                 ng_rmnode_self(NG_HOOK_NODE(hook));
 437         return (0);
 438 }
 439
 440 /*
 441  * Receive data
 442  */
 443 static int
 444 cisco_input(sc_p sc, item_p item)
 445 {
 446         const struct cisco_header *h;
 447         struct cisco_header hdrbuf;
 448         struct protoent *pep;
 449         struct mbuf *m;
 450         int error = 0;
 451
 452         /* Get data */
 453         m = NGI_M(item);
 454
 455         /* Sanity check header length */
 456         if (m->m_pkthdr.len < sizeof(*h)) {
 457                 error = EINVAL;
 458                 goto drop;
 459         }
 460
 461         /* Get cisco header */
 462         if (m->m_len >= sizeof(*h))                     /* the common case */
 463                 h = mtod(m, const struct cisco_header *);
 464         else {
 465                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
 466                 h = &hdrbuf;
 467         }
 468         m_adj(m, sizeof(*h));
 469
 470         /* Check header address */
 471         switch (h->address) {
 472         default:                /* Invalid Cisco packet. */
 473                 goto drop;
 474         case CISCO_UNICAST:
 475         case CISCO_MULTICAST:
 476                 /* Don't check the control field here (RFC 1547). */
 477                 switch (ntohs(h->protocol)) {
 478                 default:
 479                         goto drop;
 480                 case CISCO_KEEPALIVE:
 481                     {
 482                         const struct cisco_packet *p;
 483                         struct cisco_packet pktbuf;
 484
 485                         /* Sanity check packet length */
 486                         if (m->m_pkthdr.len < sizeof(*p)) {
 487                                 error = EINVAL;
 488                                 goto drop;
 489                         }
 490
 491                         /* Get cisco packet */
 492                         if (m->m_len >= sizeof(*p))     /* the common case */
 493                                 p = mtod(m, const struct cisco_packet *);
 494                         else {
 495                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
 496                                 p = &pktbuf;
 497                         }
 498
 499                         /* Check packet type */
 500                         switch (ntohl(p->type)) {
 501                         default:
 502                                 log(LOG_WARNING,
 503                                     "cisco: unknown cisco packet type: 0x%lx\n",
 504                                        (long)ntohl(p->type));
 505                                 break;
 506                         case CISCO_ADDR_REPLY:
 507                                 /* Reply on address request, ignore */
 508                                 break;
 509                         case CISCO_KEEPALIVE_REQ:
 510                                 sc->remote_seq = ntohl(p->par1);
 511                                 if (sc->local_seq == ntohl(p->par2)) {
 512                                         sc->local_seq++;
 513                                         if (sc->seqRetries > 1)
 514                                                 cisco_notify(sc, NGM_LINK_IS_UP);
 515                                         sc->seqRetries = 0;
 516                                 }
 517                                 break;
 518                         case CISCO_ADDR_REQ:
 519                             {
 520                                 struct ng_mesg *msg;
 521                                 int dummy_error = 0;
 522
 523                                 /* Ask inet peer for IP address information */
 524                                 if (sc->inet.hook == NULL)
 525                                         goto nomsg;
 526                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
 527                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
 528                                 if (msg == NULL)
 529                                         goto nomsg;
 530                                 NG_SEND_MSG_HOOK(dummy_error,
 531                                     sc->node, msg, sc->inet.hook, 0);
 532                 /*
 533                  * XXX Now maybe we should set a flag telling
 534                  * our receiver to send this message when the response comes in
 535                  * instead of now when the data may be bad.
 536                  */
 537                 nomsg:
 538                                 /* Send reply to peer device */
 539                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
 540                                             ntohl(sc->localip.s_addr),
 541                                             ntohl(sc->localmask.s_addr));
 542                                 break;
 543                             }
 544                         }
 545                         goto drop;
 546                     }
 547                 case ETHERTYPE_IP:
 548                         pep = &sc->inet;
 549                         break;
 550                 case ETHERTYPE_IPV6:
 551                         pep = &sc->inet6;
 552                         break;
 553                 case ETHERTYPE_AT:
 554                         pep = &sc->atalk;
 555                         break;
 556                 case ETHERTYPE_IPX:
 557                         pep = &sc->ipx;
 558                         break;
 559                 }
 560                 break;
 561         }
 562
 563         /* Drop if payload is empty */
 564         if (m->m_pkthdr.len == 0) {
 565                 error = EINVAL;
 566                 goto drop;
 567         }
 568
 569         /* Send it on */
 570         if (pep->hook == NULL)
 571                 goto drop;
 572         NG_FWD_NEW_DATA(error, item, pep->hook, m);
 573         return (error);
 574
 575 drop:
 576         NG_FREE_ITEM(item);
 577         return (error);
 578 }
 579
 580
 581 /*
 582  * Send keepalive packets, every 10 seconds.
 583  */
 584 static void
 585 cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2)
 586 {
 587         const sc_p sc = arg1;
 588
 589         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
 590         if (sc->seqRetries++ > 1)
 591                 cisco_notify(sc, NGM_LINK_IS_DOWN);
 592         ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
 593             &cisco_keepalive, (void *)sc, 0);
 594 }
 595
 596 /*
 597  * Send Cisco keepalive packet.
 598  */
 599 static int
 600 cisco_send(sc_p sc, int type, long par1, long par2)
 601 {
 602         struct cisco_header *h;
 603         struct cisco_packet *ch;
 604         struct mbuf *m;
 605         struct timeval time;
 606         uint32_t t;
 607         int     error = 0;
 608
 609         getmicrouptime(&time);
 610
 611         MGETHDR(m, M_NOWAIT, MT_DATA);
 612         if (!m)
 613                 return (ENOBUFS);
 614
 615         t = time.tv_sec * 1000 + time.tv_usec / 1000;
 616         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
 617         m->m_pkthdr.rcvif = 0;
 618
 619         h = mtod(m, struct cisco_header *);
 620         h->address = CISCO_MULTICAST;
 621         h->control = 0;
 622         h->protocol = htons(CISCO_KEEPALIVE);
 623
 624         ch = (struct cisco_packet *) (h + 1);
 625         ch->type = htonl(type);
 626         ch->par1 = htonl(par1);
 627         ch->par2 = htonl(par2);
 628         ch->rel = -1;
 629         ch->time0 = htons((uint16_t) (t >> 16));
 630         ch->time1 = htons((uint16_t) t);
 631
 632         NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
 633         return (error);
 634 }
 635
 636 /*
 637  * Send linkstate to upstream node.
 638  */
 639 static void
 640 cisco_notify(sc_p sc, uint32_t cmd)
 641 {
 642         struct ng_mesg *msg;
 643         int dummy_error = 0;
 644
 645         if (sc->inet.hook == NULL) /* nothing to notify */
 646                 return;
 647
 648         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
 649         if (msg != NULL)
 650                 NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0);
 651 }