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 #include <net/if_var.h>         /* XXXGL: ipx? */
  55
  56 #include <netinet/in.h>
  57 #include <netinet/if_ether.h>
  58
  59 #include <netatalk/at.h>
  60
  61 #include <netipx/ipx.h>
  62 #include <netipx/ipx_if.h>
  63
  64 #include <netgraph/ng_message.h>
  65 #include <netgraph/netgraph.h>
  66 #include <netgraph/ng_parse.h>
  67 #include <netgraph/ng_cisco.h>
  68
  69 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
  70 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
  71 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
  72 #define CISCO_ADDR_REQ          0       /* Cisco address request */
  73 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
  74 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
  75
  76 #define KEEPALIVE_SECS          10
  77
  78 struct cisco_header {
  79         uint8_t  address;
  80         uint8_t  control;
  81         uint16_t protocol;
  82 } __packed;
  83
  84 #define CISCO_HEADER_LEN        sizeof (struct cisco_header)
  85
  86 struct cisco_packet {
  87         uint32_t type;
  88         uint32_t par1;
  89         uint32_t par2;
  90         uint16_t rel;
  91         uint16_t time0;
  92         uint16_t time1;
  93 } __packed;
  94
  95 #define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
  96
  97 struct protoent {
  98         hook_p  hook;           /* the hook for this proto */
  99         uint16_t af;            /* address family, -1 = downstream */
 100 };
 101
 102 struct cisco_priv {
 103         uint32_t local_seq;
 104         uint32_t remote_seq;
 105         uint32_t seqRetries;    /* how many times we've been here throwing out
 106                                  * the same sequence number without ack */
 107         node_p  node;
 108         struct callout handle;
 109         struct protoent downstream;
 110         struct protoent inet;           /* IP information */
 111         struct in_addr localip;
 112         struct in_addr localmask;
 113         struct protoent inet6;          /* IPv6 information */
 114         struct protoent atalk;          /* AppleTalk information */
 115         struct protoent ipx;            /* IPX information */
 116 };
 117 typedef struct cisco_priv *sc_p;
 118
 119 /* Netgraph methods */
 120 static ng_constructor_t         cisco_constructor;
 121 static ng_rcvmsg_t              cisco_rcvmsg;
 122 static ng_shutdown_t            cisco_shutdown;
 123 static ng_newhook_t             cisco_newhook;
 124 static ng_rcvdata_t             cisco_rcvdata;
 125 static ng_disconnect_t          cisco_disconnect;
 126
 127 /* Other functions */
 128 static int      cisco_input(sc_p sc, item_p item);
 129 static void     cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2);
 130 static int      cisco_send(sc_p sc, int type, long par1, long par2);
 131 static void     cisco_notify(sc_p sc, uint32_t cmd);
 132
 133 /* Parse type for struct ng_cisco_ipaddr */
 134 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
 135         = NG_CISCO_IPADDR_TYPE_INFO;
 136 static const struct ng_parse_type ng_cisco_ipaddr_type = {
 137         &ng_parse_struct_type,
 138         &ng_cisco_ipaddr_type_fields
 139 };
 140
 141 /* Parse type for struct ng_async_stat */
 142 static const struct ng_parse_struct_field ng_cisco_stats_type_fields[]
 143         = NG_CISCO_STATS_TYPE_INFO;
 144 static const struct ng_parse_type ng_cisco_stats_type = {
 145         &ng_parse_struct_type,
 146         &ng_cisco_stats_type_fields
 147 };
 148
 149 /* List of commands and how to convert arguments to/from ASCII */
 150 static const struct ng_cmdlist ng_cisco_cmdlist[] = {
 151         {
 152           NGM_CISCO_COOKIE,
 153           NGM_CISCO_SET_IPADDR,
 154           "setipaddr",
 155           &ng_cisco_ipaddr_type,
 156           NULL
 157         },
 158         {
 159           NGM_CISCO_COOKIE,
 160           NGM_CISCO_GET_IPADDR,
 161           "getipaddr",
 162           NULL,
 163           &ng_cisco_ipaddr_type
 164         },
 165         {
 166           NGM_CISCO_COOKIE,
 167           NGM_CISCO_GET_STATUS,
 168           "getstats",
 169           NULL,
 170           &ng_cisco_stats_type
 171         },
 172         { 0 }
 173 };
 174
 175 /* Node type */
 176 static struct ng_type typestruct = {
 177         .version =      NG_ABI_VERSION,
 178         .name =         NG_CISCO_NODE_TYPE,
 179         .constructor =  cisco_constructor,
 180         .rcvmsg =       cisco_rcvmsg,
 181         .shutdown =     cisco_shutdown,
 182         .newhook =      cisco_newhook,
 183         .rcvdata =      cisco_rcvdata,
 184         .disconnect =   cisco_disconnect,
 185         .cmdlist =      ng_cisco_cmdlist,
 186 };
 187 NETGRAPH_INIT(cisco, &typestruct);
 188
 189 /*
 190  * Node constructor
 191  */
 192 static int
 193 cisco_constructor(node_p node)
 194 {
 195         sc_p sc;
 196
 197         sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO);
 198
 199         ng_callout_init(&sc->handle);
 200         NG_NODE_SET_PRIVATE(node, sc);
 201         sc->node = node;
 202
 203         /* Initialise the varous protocol hook holders */
 204         sc->downstream.af = 0xffff;
 205         sc->inet.af = AF_INET;
 206         sc->inet6.af = AF_INET6;
 207         sc->atalk.af = AF_APPLETALK;
 208         sc->ipx.af = AF_IPX;
 209         return (0);
 210 }
 211
 212 /*
 213  * Check new hook
 214  */
 215 static int
 216 cisco_newhook(node_p node, hook_p hook, const char *name)
 217 {
 218         const sc_p sc = NG_NODE_PRIVATE(node);
 219
 220         if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
 221                 sc->downstream.hook = hook;
 222                 NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
 223
 224                 /* Start keepalives */
 225                 ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
 226                     &cisco_keepalive, (void *)sc, 0);
 227         } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
 228                 sc->inet.hook = hook;
 229                 NG_HOOK_SET_PRIVATE(hook, &sc->inet);
 230         } else if (strcmp(name, NG_CISCO_HOOK_INET6) == 0) {
 231                 sc->inet6.hook = hook;
 232                 NG_HOOK_SET_PRIVATE(hook, &sc->inet6);
 233         } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
 234                 sc->atalk.hook = hook;
 235                 NG_HOOK_SET_PRIVATE(hook, &sc->atalk);
 236         } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
 237                 sc->ipx.hook = hook;
 238                 NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
 239         } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
 240                 NG_HOOK_SET_PRIVATE(hook, NULL);        /* unimplemented */
 241         } else
 242                 return (EINVAL);
 243         return 0;
 244 }
 245
 246 /*
 247  * Receive control message.
 248  */
 249 static int
 250 cisco_rcvmsg(node_p node, item_p item, hook_p lasthook)
 251 {
 252         struct ng_mesg *msg;
 253         const sc_p sc = NG_NODE_PRIVATE(node);
 254         struct ng_mesg *resp = NULL;
 255         int error = 0;
 256
 257         NGI_GET_MSG(item, msg);
 258         switch (msg->header.typecookie) {
 259         case NGM_GENERIC_COOKIE:
 260                 switch (msg->header.cmd) {
 261                 case NGM_TEXT_STATUS:
 262                     {
 263                         char *arg;
 264                         int pos;
 265
 266                         NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
 267                         if (resp == NULL) {
 268                                 error = ENOMEM;
 269                                 break;
 270                         }
 271                         arg = (char *) resp->data;
 272                         pos = sprintf(arg,
 273                           "keepalive period: %d sec; ", KEEPALIVE_SECS);
 274                         pos += sprintf(arg + pos,
 275                           "unacknowledged keepalives: %d", sc->seqRetries);
 276                         resp->header.arglen = pos + 1;
 277                         break;
 278                     }
 279                 default:
 280                         error = EINVAL;
 281                         break;
 282                 }
 283                 break;
 284         case NGM_CISCO_COOKIE:
 285                 switch (msg->header.cmd) {
 286                 case NGM_CISCO_GET_IPADDR:      /* could be a late reply! */
 287                         if ((msg->header.flags & NGF_RESP) == 0) {
 288                                 struct in_addr *ips;
 289
 290                                 NG_MKRESPONSE(resp, msg,
 291                                     2 * sizeof(*ips), M_NOWAIT);
 292                                 if (!resp) {
 293                                         error = ENOMEM;
 294                                         break;
 295                                 }
 296                                 ips = (struct in_addr *) resp->data;
 297                                 ips[0] = sc->localip;
 298                                 ips[1] = sc->localmask;
 299                                 break;
 300                         }
 301                         /* FALLTHROUGH */       /* ...if it's a reply */
 302                 case NGM_CISCO_SET_IPADDR:
 303                     {
 304                         struct in_addr *const ips = (struct in_addr *)msg->data;
 305
 306                         if (msg->header.arglen < 2 * sizeof(*ips)) {
 307                                 error = EINVAL;
 308                                 break;
 309                         }
 310                         sc->localip = ips[0];
 311                         sc->localmask = ips[1];
 312                         break;
 313                     }
 314                 case NGM_CISCO_GET_STATUS:
 315                     {
 316                         struct ng_cisco_stats *stat;
 317
 318                         NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
 319                         if (!resp) {
 320                                 error = ENOMEM;
 321                                 break;
 322                         }
 323                         stat = (struct ng_cisco_stats *)resp->data;
 324                         stat->seqRetries = sc->seqRetries;
 325                         stat->keepAlivePeriod = KEEPALIVE_SECS;
 326                         break;
 327                     }
 328                 default:
 329                         error = EINVAL;
 330                         break;
 331                 }
 332                 break;
 333         default:
 334                 error = EINVAL;
 335                 break;
 336         }
 337         NG_RESPOND_MSG(error, node, item, resp);
 338         NG_FREE_MSG(msg);
 339         return (error);
 340 }
 341
 342 /*
 343  * Receive data
 344  */
 345 static int
 346 cisco_rcvdata(hook_p hook, item_p item)
 347 {
 348         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 349         struct protoent *pep;
 350         struct cisco_header *h;
 351         struct mbuf *m;
 352         int error = 0;
 353
 354         if ((pep = NG_HOOK_PRIVATE(hook)) == NULL)
 355                 goto out;
 356
 357         /* If it came from our downlink, deal with it separately */
 358         if (pep->af == 0xffff)
 359                 return (cisco_input(sc, item));
 360
 361         /* OK so it came from a protocol, heading out. Prepend general data
 362            packet header. For now, IP,IPX only  */
 363         NGI_GET_M(item, m);
 364         M_PREPEND(m, CISCO_HEADER_LEN, M_NOWAIT);
 365         if (!m) {
 366                 error = ENOBUFS;
 367                 goto out;
 368         }
 369         NGI_M(item) = m;
 370         h = mtod(m, struct cisco_header *);
 371         h->address = CISCO_UNICAST;
 372         h->control = 0;
 373
 374         switch (pep->af) {
 375         case AF_INET:           /* Internet Protocol */
 376                 h->protocol = htons(ETHERTYPE_IP);
 377                 break;
 378         case AF_INET6:
 379                 h->protocol = htons(ETHERTYPE_IPV6);
 380                 break;
 381         case AF_APPLETALK:      /* AppleTalk Protocol */
 382                 h->protocol = htons(ETHERTYPE_AT);
 383                 break;
 384         case AF_IPX:            /* Novell IPX Protocol */
 385                 h->protocol = htons(ETHERTYPE_IPX);
 386                 break;
 387         default:
 388                 error = EAFNOSUPPORT;
 389                 goto out;
 390         }
 391
 392         /* Send it */
 393         NG_FWD_NEW_DATA(error, item,  sc->downstream.hook, m);
 394         return (error);
 395
 396 out:
 397         NG_FREE_ITEM(item);
 398         return (error);
 399 }
 400
 401 /*
 402  * Shutdown node
 403  */
 404 static int
 405 cisco_shutdown(node_p node)
 406 {
 407         const sc_p sc = NG_NODE_PRIVATE(node);
 408
 409         NG_NODE_SET_PRIVATE(node, NULL);
 410         NG_NODE_UNREF(sc->node);
 411         free(sc, M_NETGRAPH);
 412         return (0);
 413 }
 414
 415 /*
 416  * Disconnection of a hook
 417  *
 418  * For this type, removal of the last link destroys the node
 419  */
 420 static int
 421 cisco_disconnect(hook_p hook)
 422 {
 423         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 424         struct protoent *pep;
 425
 426         /* Check it's not the debug hook */
 427         if ((pep = NG_HOOK_PRIVATE(hook))) {
 428                 pep->hook = NULL;
 429                 if (pep->af == 0xffff)
 430                         /* If it is the downstream hook, stop the timers */
 431                         ng_uncallout(&sc->handle, NG_HOOK_NODE(hook));
 432         }
 433
 434         /* If no more hooks, remove the node */
 435         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
 436         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
 437                 ng_rmnode_self(NG_HOOK_NODE(hook));
 438         return (0);
 439 }
 440
 441 /*
 442  * Receive data
 443  */
 444 static int
 445 cisco_input(sc_p sc, item_p item)
 446 {
 447         const struct cisco_header *h;
 448         struct cisco_header hdrbuf;
 449         struct protoent *pep;
 450         struct mbuf *m;
 451         int error = 0;
 452
 453         /* Get data */
 454         m = NGI_M(item);
 455
 456         /* Sanity check header length */
 457         if (m->m_pkthdr.len < sizeof(*h)) {
 458                 error = EINVAL;
 459                 goto drop;
 460         }
 461
 462         /* Get cisco header */
 463         if (m->m_len >= sizeof(*h))                     /* the common case */
 464                 h = mtod(m, const struct cisco_header *);
 465         else {
 466                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
 467                 h = &hdrbuf;
 468         }
 469         m_adj(m, sizeof(*h));
 470
 471         /* Check header address */
 472         switch (h->address) {
 473         default:                /* Invalid Cisco packet. */
 474                 goto drop;
 475         case CISCO_UNICAST:
 476         case CISCO_MULTICAST:
 477                 /* Don't check the control field here (RFC 1547). */
 478                 switch (ntohs(h->protocol)) {
 479                 default:
 480                         goto drop;
 481                 case CISCO_KEEPALIVE:
 482                     {
 483                         const struct cisco_packet *p;
 484                         struct cisco_packet pktbuf;
 485
 486                         /* Sanity check packet length */
 487                         if (m->m_pkthdr.len < sizeof(*p)) {
 488                                 error = EINVAL;
 489                                 goto drop;
 490                         }
 491
 492                         /* Get cisco packet */
 493                         if (m->m_len >= sizeof(*p))     /* the common case */
 494                                 p = mtod(m, const struct cisco_packet *);
 495                         else {
 496                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
 497                                 p = &pktbuf;
 498                         }
 499
 500                         /* Check packet type */
 501                         switch (ntohl(p->type)) {
 502                         default:
 503                                 log(LOG_WARNING,
 504                                     "cisco: unknown cisco packet type: 0x%lx\n",
 505                                        (long)ntohl(p->type));
 506                                 break;
 507                         case CISCO_ADDR_REPLY:
 508                                 /* Reply on address request, ignore */
 509                                 break;
 510                         case CISCO_KEEPALIVE_REQ:
 511                                 sc->remote_seq = ntohl(p->par1);
 512                                 if (sc->local_seq == ntohl(p->par2)) {
 513                                         sc->local_seq++;
 514                                         if (sc->seqRetries > 1)
 515                                                 cisco_notify(sc, NGM_LINK_IS_UP);
 516                                         sc->seqRetries = 0;
 517                                 }
 518                                 break;
 519                         case CISCO_ADDR_REQ:
 520                             {
 521                                 struct ng_mesg *msg;
 522                                 int dummy_error = 0;
 523
 524                                 /* Ask inet peer for IP address information */
 525                                 if (sc->inet.hook == NULL)
 526                                         goto nomsg;
 527                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
 528                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
 529                                 if (msg == NULL)
 530                                         goto nomsg;
 531                                 NG_SEND_MSG_HOOK(dummy_error,
 532                                     sc->node, msg, sc->inet.hook, 0);
 533                 /*
 534                  * XXX Now maybe we should set a flag telling
 535                  * our receiver to send this message when the response comes in
 536                  * instead of now when the data may be bad.
 537                  */
 538                 nomsg:
 539                                 /* Send reply to peer device */
 540                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
 541                                             ntohl(sc->localip.s_addr),
 542                                             ntohl(sc->localmask.s_addr));
 543                                 break;
 544                             }
 545                         }
 546                         goto drop;
 547                     }
 548                 case ETHERTYPE_IP:
 549                         pep = &sc->inet;
 550                         break;
 551                 case ETHERTYPE_IPV6:
 552                         pep = &sc->inet6;
 553                         break;
 554                 case ETHERTYPE_AT:
 555                         pep = &sc->atalk;
 556                         break;
 557                 case ETHERTYPE_IPX:
 558                         pep = &sc->ipx;
 559                         break;
 560                 }
 561                 break;
 562         }
 563
 564         /* Drop if payload is empty */
 565         if (m->m_pkthdr.len == 0) {
 566                 error = EINVAL;
 567                 goto drop;
 568         }
 569
 570         /* Send it on */
 571         if (pep->hook == NULL)
 572                 goto drop;
 573         NG_FWD_NEW_DATA(error, item, pep->hook, m);
 574         return (error);
 575
 576 drop:
 577         NG_FREE_ITEM(item);
 578         return (error);
 579 }
 580
 581
 582 /*
 583  * Send keepalive packets, every 10 seconds.
 584  */
 585 static void
 586 cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2)
 587 {
 588         const sc_p sc = arg1;
 589
 590         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
 591         if (sc->seqRetries++ > 1)
 592                 cisco_notify(sc, NGM_LINK_IS_DOWN);
 593         ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
 594             &cisco_keepalive, (void *)sc, 0);
 595 }
 596
 597 /*
 598  * Send Cisco keepalive packet.
 599  */
 600 static int
 601 cisco_send(sc_p sc, int type, long par1, long par2)
 602 {
 603         struct cisco_header *h;
 604         struct cisco_packet *ch;
 605         struct mbuf *m;
 606         struct timeval time;
 607         uint32_t t;
 608         int     error = 0;
 609
 610         getmicrouptime(&time);
 611
 612         MGETHDR(m, M_NOWAIT, MT_DATA);
 613         if (!m)
 614                 return (ENOBUFS);
 615
 616         t = time.tv_sec * 1000 + time.tv_usec / 1000;
 617         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
 618         m->m_pkthdr.rcvif = 0;
 619
 620         h = mtod(m, struct cisco_header *);
 621         h->address = CISCO_MULTICAST;
 622         h->control = 0;
 623         h->protocol = htons(CISCO_KEEPALIVE);
 624
 625         ch = (struct cisco_packet *) (h + 1);
 626         ch->type = htonl(type);
 627         ch->par1 = htonl(par1);
 628         ch->par2 = htonl(par2);
 629         ch->rel = -1;
 630         ch->time0 = htons((uint16_t) (t >> 16));
 631         ch->time1 = htons((uint16_t) t);
 632
 633         NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
 634         return (error);
 635 }
 636
 637 /*
 638  * Send linkstate to upstream node.
 639  */
 640 static void
 641 cisco_notify(sc_p sc, uint32_t cmd)
 642 {
 643         struct ng_mesg *msg;
 644         int dummy_error = 0;
 645
 646         if (sc->inet.hook == NULL) /* nothing to notify */
 647                 return;
 648
 649         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
 650         if (msg != NULL)
 651                 NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0);
 652 }