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: releng/10.0/sys/netgraph/ng_cisco.c 243882 2012-12-05 08:04:20Z glebius $
   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 }

Cache object: f5399fed2cb5847bf05c0d21c598a6ef


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