The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_cisco.c

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    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: src/sys/netgraph/ng_cisco.c,v 1.23.2.3 2005/05/16 12:43:36 glebius Exp $
   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         u_char  address;
   79         u_char  control;
   80         u_short protocol;
   81 };
   82 
   83 #define CISCO_HEADER_LEN        sizeof (struct cisco_header)
   84 
   85 struct cisco_packet {
   86         u_long  type;
   87         u_long  par1;
   88         u_long  par2;
   89         u_short rel;
   90         u_short time0;
   91         u_short time1;
   92 };
   93 
   94 #define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
   95 
   96 struct protoent {
   97         hook_p  hook;           /* the hook for this proto */
   98         u_short af;             /* address family, -1 = downstream */
   99 };
  100 
  101 struct cisco_priv {
  102         u_long  local_seq;
  103         u_long  remote_seq;
  104         u_long  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         MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO);
  197         if (sc == NULL)
  198                 return (ENOMEM);
  199 
  200         ng_callout_init(&sc->handle);
  201         NG_NODE_SET_PRIVATE(node, sc);
  202         sc->node = node;
  203 
  204         /* Initialise the varous protocol hook holders */
  205         sc->downstream.af = 0xffff;
  206         sc->inet.af = AF_INET;
  207         sc->inet6.af = AF_INET6;
  208         sc->atalk.af = AF_APPLETALK;
  209         sc->ipx.af = AF_IPX;
  210         return (0);
  211 }
  212 
  213 /*
  214  * Check new hook
  215  */
  216 static int
  217 cisco_newhook(node_p node, hook_p hook, const char *name)
  218 {
  219         const sc_p sc = NG_NODE_PRIVATE(node);
  220 
  221         if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
  222                 sc->downstream.hook = hook;
  223                 NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
  224 
  225                 /* Start keepalives */
  226                 ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
  227                     &cisco_keepalive, (void *)sc, 0);
  228         } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
  229                 sc->inet.hook = hook;
  230                 NG_HOOK_SET_PRIVATE(hook, &sc->inet);
  231         } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
  232                 sc->atalk.hook = hook;
  233                 NG_HOOK_SET_PRIVATE(hook, &sc->atalk);
  234         } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
  235                 sc->ipx.hook = hook;
  236                 NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
  237         } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
  238                 NG_HOOK_SET_PRIVATE(hook, NULL);        /* unimplemented */
  239         } else
  240                 return (EINVAL);
  241         return 0;
  242 }
  243 
  244 /*
  245  * Receive control message.
  246  */
  247 static int
  248 cisco_rcvmsg(node_p node, item_p item, hook_p lasthook)
  249 {
  250         struct ng_mesg *msg;
  251         const sc_p sc = NG_NODE_PRIVATE(node);
  252         struct ng_mesg *resp = NULL;
  253         int error = 0;
  254 
  255         NGI_GET_MSG(item, msg);
  256         switch (msg->header.typecookie) {
  257         case NGM_GENERIC_COOKIE:
  258                 switch (msg->header.cmd) {
  259                 case NGM_TEXT_STATUS:
  260                     {
  261                         char *arg;
  262                         int pos;
  263 
  264                         NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
  265                         if (resp == NULL) {
  266                                 error = ENOMEM;
  267                                 break;
  268                         }
  269                         arg = (char *) resp->data;
  270                         pos = sprintf(arg,
  271                           "keepalive period: %d sec; ", KEEPALIVE_SECS);
  272                         pos += sprintf(arg + pos,
  273                           "unacknowledged keepalives: %ld", sc->seqRetries);
  274                         resp->header.arglen = pos + 1;
  275                         break;
  276                     }
  277                 default:
  278                         error = EINVAL;
  279                         break;
  280                 }
  281                 break;
  282         case NGM_CISCO_COOKIE:
  283                 switch (msg->header.cmd) {
  284                 case NGM_CISCO_GET_IPADDR:      /* could be a late reply! */
  285                         if ((msg->header.flags & NGF_RESP) == 0) {
  286                                 struct in_addr *ips;
  287 
  288                                 NG_MKRESPONSE(resp, msg,
  289                                     2 * sizeof(*ips), M_NOWAIT);
  290                                 if (!resp) {
  291                                         error = ENOMEM;
  292                                         break;
  293                                 }
  294                                 ips = (struct in_addr *) resp->data;
  295                                 ips[0] = sc->localip;
  296                                 ips[1] = sc->localmask;
  297                                 break;
  298                         }
  299                         /* FALLTHROUGH */       /* ...if it's a reply */
  300                 case NGM_CISCO_SET_IPADDR:
  301                     {
  302                         struct in_addr *const ips = (struct in_addr *)msg->data;
  303 
  304                         if (msg->header.arglen < 2 * sizeof(*ips)) {
  305                                 error = EINVAL;
  306                                 break;
  307                         }
  308                         sc->localip = ips[0];
  309                         sc->localmask = ips[1];
  310                         break;
  311                     }
  312                 case NGM_CISCO_GET_STATUS:
  313                     {
  314                         struct ng_cisco_stats *stat;
  315 
  316                         NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
  317                         if (!resp) {
  318                                 error = ENOMEM;
  319                                 break;
  320                         }
  321                         stat = (struct ng_cisco_stats *)resp->data;
  322                         stat->seqRetries = sc->seqRetries;
  323                         stat->keepAlivePeriod = KEEPALIVE_SECS;
  324                         break;
  325                     }
  326                 default:
  327                         error = EINVAL;
  328                         break;
  329                 }
  330                 break;
  331         default:
  332                 error = EINVAL;
  333                 break;
  334         }
  335         NG_RESPOND_MSG(error, node, item, resp);
  336         NG_FREE_MSG(msg);
  337         return (error);
  338 }
  339 
  340 /*
  341  * Receive data
  342  */
  343 static int
  344 cisco_rcvdata(hook_p hook, item_p item)
  345 {
  346         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  347         struct protoent *pep;
  348         struct cisco_header *h;
  349         struct mbuf *m;
  350         int error = 0;
  351 
  352         if ((pep = NG_HOOK_PRIVATE(hook)) == NULL)
  353                 goto out;
  354 
  355         /* If it came from our downlink, deal with it separately */
  356         if (pep->af == 0xffff)
  357                 return (cisco_input(sc, item));
  358 
  359         /* OK so it came from a protocol, heading out. Prepend general data
  360            packet header. For now, IP,IPX only  */
  361         m = NGI_M(item); /* still associated with item */
  362         M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
  363         if (!m) {
  364                 error = ENOBUFS;
  365                 goto out;
  366         }
  367         h = mtod(m, struct cisco_header *);
  368         h->address = CISCO_UNICAST;
  369         h->control = 0;
  370 
  371         switch (pep->af) {
  372         case AF_INET:           /* Internet Protocol */
  373                 h->protocol = htons(ETHERTYPE_IP);
  374                 break;
  375         case AF_INET6:
  376                 h->protocol = htons(ETHERTYPE_IPV6);
  377                 break;
  378         case AF_APPLETALK:      /* AppleTalk Protocol */
  379                 h->protocol = htons(ETHERTYPE_AT);
  380                 break;
  381         case AF_IPX:            /* Novell IPX Protocol */
  382                 h->protocol = htons(ETHERTYPE_IPX);
  383                 break;
  384         default:
  385                 error = EAFNOSUPPORT;
  386                 goto out;
  387         }
  388 
  389         /* Send it */
  390         NG_FWD_NEW_DATA(error, item,  sc->downstream.hook, m);
  391         return (error);
  392 
  393 out:
  394         NG_FREE_ITEM(item);
  395         return (error);
  396 }
  397 
  398 /*
  399  * Shutdown node
  400  */
  401 static int
  402 cisco_shutdown(node_p node)
  403 {
  404         const sc_p sc = NG_NODE_PRIVATE(node);
  405 
  406         NG_NODE_SET_PRIVATE(node, NULL);
  407         NG_NODE_UNREF(sc->node);
  408         FREE(sc, M_NETGRAPH);
  409         return (0);
  410 }
  411 
  412 /*
  413  * Disconnection of a hook
  414  *
  415  * For this type, removal of the last link destroys the node
  416  */
  417 static int
  418 cisco_disconnect(hook_p hook)
  419 {
  420         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  421         struct protoent *pep;
  422 
  423         /* Check it's not the debug hook */
  424         if ((pep = NG_HOOK_PRIVATE(hook))) {
  425                 pep->hook = NULL;
  426                 if (pep->af == 0xffff)
  427                         /* If it is the downstream hook, stop the timers */
  428                         ng_uncallout(&sc->handle, NG_HOOK_NODE(hook));
  429         }
  430 
  431         /* If no more hooks, remove the node */
  432         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  433         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  434                 ng_rmnode_self(NG_HOOK_NODE(hook));
  435         return (0);
  436 }
  437 
  438 /*
  439  * Receive data
  440  */
  441 static int
  442 cisco_input(sc_p sc, item_p item)
  443 {
  444         const struct cisco_header *h;
  445         struct cisco_header hdrbuf;
  446         struct protoent *pep;
  447         struct mbuf *m;
  448         int error = 0;
  449 
  450         /* Get data */
  451         m = NGI_M(item);
  452 
  453         /* Sanity check header length */
  454         if (m->m_pkthdr.len < sizeof(*h)) {
  455                 error = EINVAL;
  456                 goto drop;
  457         }
  458 
  459         /* Get cisco header */
  460         if (m->m_len >= sizeof(*h))                     /* the common case */
  461                 h = mtod(m, const struct cisco_header *);
  462         else {
  463                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
  464                 h = &hdrbuf;
  465         }
  466         m_adj(m, sizeof(*h));
  467 
  468         /* Check header address */
  469         switch (h->address) {
  470         default:                /* Invalid Cisco packet. */
  471                 goto drop;
  472         case CISCO_UNICAST:
  473         case CISCO_MULTICAST:
  474                 /* Don't check the control field here (RFC 1547). */
  475                 switch (ntohs(h->protocol)) {
  476                 default:
  477                         goto drop;
  478                 case CISCO_KEEPALIVE:
  479                     {
  480                         const struct cisco_packet *p;
  481                         struct cisco_packet pktbuf;
  482 
  483                         /* Sanity check packet length */
  484                         if (m->m_pkthdr.len < sizeof(*p)) {
  485                                 error = EINVAL;
  486                                 goto drop;
  487                         }
  488 
  489                         /* Get cisco packet */
  490                         if (m->m_len >= sizeof(*p))     /* the common case */
  491                                 p = mtod(m, const struct cisco_packet *);
  492                         else {
  493                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
  494                                 p = &pktbuf;
  495                         }
  496 
  497                         /* Check packet type */
  498                         switch (ntohl(p->type)) {
  499                         default:
  500                                 log(LOG_WARNING,
  501                                     "cisco: unknown cisco packet type: 0x%lx\n",
  502                                        (long)ntohl(p->type));
  503                                 break;
  504                         case CISCO_ADDR_REPLY:
  505                                 /* Reply on address request, ignore */
  506                                 break;
  507                         case CISCO_KEEPALIVE_REQ:
  508                                 sc->remote_seq = ntohl(p->par1);
  509                                 if (sc->local_seq == ntohl(p->par2)) {
  510                                         sc->local_seq++;
  511                                         if (sc->seqRetries > 1)
  512                                                 cisco_notify(sc, NGM_LINK_IS_UP);
  513                                         sc->seqRetries = 0;
  514                                 }
  515                                 break;
  516                         case CISCO_ADDR_REQ:
  517                             {
  518                                 struct ng_mesg *msg;
  519                                 int dummy_error = 0;
  520 
  521                                 /* Ask inet peer for IP address information */
  522                                 if (sc->inet.hook == NULL)
  523                                         goto nomsg;
  524                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
  525                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
  526                                 if (msg == NULL)
  527                                         goto nomsg;
  528                                 NG_SEND_MSG_HOOK(dummy_error,
  529                                     sc->node, msg, sc->inet.hook, 0);
  530                 /*
  531                  * XXX Now maybe we should set a flag telling
  532                  * our receiver to send this message when the response comes in
  533                  * instead of now when the data may be bad.
  534                  */
  535                 nomsg:
  536                                 /* Send reply to peer device */
  537                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
  538                                             ntohl(sc->localip.s_addr),
  539                                             ntohl(sc->localmask.s_addr));
  540                                 break;
  541                             }
  542                         }
  543                         goto drop;
  544                     }
  545                 case ETHERTYPE_IP:
  546                         pep = &sc->inet;
  547                         break;
  548                 case ETHERTYPE_IPV6:
  549                         pep = &sc->inet6;
  550                         break;
  551                 case ETHERTYPE_AT:
  552                         pep = &sc->atalk;
  553                         break;
  554                 case ETHERTYPE_IPX:
  555                         pep = &sc->ipx;
  556                         break;
  557                 }
  558                 break;
  559         }
  560 
  561         /* Drop if payload is empty */
  562         if (m->m_pkthdr.len == 0) {
  563                 error = EINVAL;
  564                 goto drop;
  565         }
  566 
  567         /* Send it on */
  568         if (pep->hook == NULL)
  569                 goto drop;
  570         NG_FWD_NEW_DATA(error, item, pep->hook, m);
  571         return (error);
  572 
  573 drop:
  574         NG_FREE_ITEM(item);
  575         return (error);
  576 }
  577 
  578 
  579 /*
  580  * Send keepalive packets, every 10 seconds.
  581  */
  582 static void
  583 cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2)
  584 {
  585         const sc_p sc = arg1;
  586 
  587         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
  588         if (sc->seqRetries++ > 1)
  589                 cisco_notify(sc, NGM_LINK_IS_DOWN);
  590         ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
  591             &cisco_keepalive, (void *)sc, 0);
  592 }
  593 
  594 /*
  595  * Send Cisco keepalive packet.
  596  */
  597 static int
  598 cisco_send(sc_p sc, int type, long par1, long par2)
  599 {
  600         struct cisco_header *h;
  601         struct cisco_packet *ch;
  602         struct mbuf *m;
  603         struct timeval time;
  604         u_long  t;
  605         int     error = 0;
  606 
  607         getmicrouptime(&time);
  608 
  609         MGETHDR(m, M_DONTWAIT, MT_DATA);
  610         if (!m)
  611                 return (ENOBUFS);
  612 
  613         t = time.tv_sec * 1000 + time.tv_usec / 1000;
  614         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
  615         m->m_pkthdr.rcvif = 0;
  616 
  617         h = mtod(m, struct cisco_header *);
  618         h->address = CISCO_MULTICAST;
  619         h->control = 0;
  620         h->protocol = htons(CISCO_KEEPALIVE);
  621 
  622         ch = (struct cisco_packet *) (h + 1);
  623         ch->type = htonl(type);
  624         ch->par1 = htonl(par1);
  625         ch->par2 = htonl(par2);
  626         ch->rel = -1;
  627         ch->time0 = htons((u_short) (t >> 16));
  628         ch->time1 = htons((u_short) t);
  629 
  630         NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
  631         return (error);
  632 }
  633 
  634 /*
  635  * Send linkstate to upstream node.
  636  */
  637 static void
  638 cisco_notify(sc_p sc, uint32_t cmd)
  639 {
  640         struct ng_mesg *msg;
  641         int dummy_error = 0;
  642 
  643         if (sc->inet.hook == NULL) /* nothing to notify */
  644                 return;
  645                 
  646         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  647         if (msg != NULL)
  648                 NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0);
  649 }

Cache object: 01d3f96c3f8344f7969b60d57caee9da


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