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: stable/9/sys/netgraph/ng_cisco.c 231752 2012-02-15 10:08:13Z fjoe $
   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         m = NGI_M(item); /* still associated with item */
  363         M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT);
  364         if (!m) {
  365                 error = ENOBUFS;
  366                 goto out;
  367         }
  368         h = mtod(m, struct cisco_header *);
  369         h->address = CISCO_UNICAST;
  370         h->control = 0;
  371 
  372         switch (pep->af) {
  373         case AF_INET:           /* Internet Protocol */
  374                 h->protocol = htons(ETHERTYPE_IP);
  375                 break;
  376         case AF_INET6:
  377                 h->protocol = htons(ETHERTYPE_IPV6);
  378                 break;
  379         case AF_APPLETALK:      /* AppleTalk Protocol */
  380                 h->protocol = htons(ETHERTYPE_AT);
  381                 break;
  382         case AF_IPX:            /* Novell IPX Protocol */
  383                 h->protocol = htons(ETHERTYPE_IPX);
  384                 break;
  385         default:
  386                 error = EAFNOSUPPORT;
  387                 goto out;
  388         }
  389 
  390         /* Send it */
  391         NG_FWD_NEW_DATA(error, item,  sc->downstream.hook, m);
  392         return (error);
  393 
  394 out:
  395         NG_FREE_ITEM(item);
  396         return (error);
  397 }
  398 
  399 /*
  400  * Shutdown node
  401  */
  402 static int
  403 cisco_shutdown(node_p node)
  404 {
  405         const sc_p sc = NG_NODE_PRIVATE(node);
  406 
  407         NG_NODE_SET_PRIVATE(node, NULL);
  408         NG_NODE_UNREF(sc->node);
  409         free(sc, M_NETGRAPH);
  410         return (0);
  411 }
  412 
  413 /*
  414  * Disconnection of a hook
  415  *
  416  * For this type, removal of the last link destroys the node
  417  */
  418 static int
  419 cisco_disconnect(hook_p hook)
  420 {
  421         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  422         struct protoent *pep;
  423 
  424         /* Check it's not the debug hook */
  425         if ((pep = NG_HOOK_PRIVATE(hook))) {
  426                 pep->hook = NULL;
  427                 if (pep->af == 0xffff)
  428                         /* If it is the downstream hook, stop the timers */
  429                         ng_uncallout(&sc->handle, NG_HOOK_NODE(hook));
  430         }
  431 
  432         /* If no more hooks, remove the node */
  433         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  434         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  435                 ng_rmnode_self(NG_HOOK_NODE(hook));
  436         return (0);
  437 }
  438 
  439 /*
  440  * Receive data
  441  */
  442 static int
  443 cisco_input(sc_p sc, item_p item)
  444 {
  445         const struct cisco_header *h;
  446         struct cisco_header hdrbuf;
  447         struct protoent *pep;
  448         struct mbuf *m;
  449         int error = 0;
  450 
  451         /* Get data */
  452         m = NGI_M(item);
  453 
  454         /* Sanity check header length */
  455         if (m->m_pkthdr.len < sizeof(*h)) {
  456                 error = EINVAL;
  457                 goto drop;
  458         }
  459 
  460         /* Get cisco header */
  461         if (m->m_len >= sizeof(*h))                     /* the common case */
  462                 h = mtod(m, const struct cisco_header *);
  463         else {
  464                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
  465                 h = &hdrbuf;
  466         }
  467         m_adj(m, sizeof(*h));
  468 
  469         /* Check header address */
  470         switch (h->address) {
  471         default:                /* Invalid Cisco packet. */
  472                 goto drop;
  473         case CISCO_UNICAST:
  474         case CISCO_MULTICAST:
  475                 /* Don't check the control field here (RFC 1547). */
  476                 switch (ntohs(h->protocol)) {
  477                 default:
  478                         goto drop;
  479                 case CISCO_KEEPALIVE:
  480                     {
  481                         const struct cisco_packet *p;
  482                         struct cisco_packet pktbuf;
  483 
  484                         /* Sanity check packet length */
  485                         if (m->m_pkthdr.len < sizeof(*p)) {
  486                                 error = EINVAL;
  487                                 goto drop;
  488                         }
  489 
  490                         /* Get cisco packet */
  491                         if (m->m_len >= sizeof(*p))     /* the common case */
  492                                 p = mtod(m, const struct cisco_packet *);
  493                         else {
  494                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
  495                                 p = &pktbuf;
  496                         }
  497 
  498                         /* Check packet type */
  499                         switch (ntohl(p->type)) {
  500                         default:
  501                                 log(LOG_WARNING,
  502                                     "cisco: unknown cisco packet type: 0x%lx\n",
  503                                        (long)ntohl(p->type));
  504                                 break;
  505                         case CISCO_ADDR_REPLY:
  506                                 /* Reply on address request, ignore */
  507                                 break;
  508                         case CISCO_KEEPALIVE_REQ:
  509                                 sc->remote_seq = ntohl(p->par1);
  510                                 if (sc->local_seq == ntohl(p->par2)) {
  511                                         sc->local_seq++;
  512                                         if (sc->seqRetries > 1)
  513                                                 cisco_notify(sc, NGM_LINK_IS_UP);
  514                                         sc->seqRetries = 0;
  515                                 }
  516                                 break;
  517                         case CISCO_ADDR_REQ:
  518                             {
  519                                 struct ng_mesg *msg;
  520                                 int dummy_error = 0;
  521 
  522                                 /* Ask inet peer for IP address information */
  523                                 if (sc->inet.hook == NULL)
  524                                         goto nomsg;
  525                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
  526                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
  527                                 if (msg == NULL)
  528                                         goto nomsg;
  529                                 NG_SEND_MSG_HOOK(dummy_error,
  530                                     sc->node, msg, sc->inet.hook, 0);
  531                 /*
  532                  * XXX Now maybe we should set a flag telling
  533                  * our receiver to send this message when the response comes in
  534                  * instead of now when the data may be bad.
  535                  */
  536                 nomsg:
  537                                 /* Send reply to peer device */
  538                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
  539                                             ntohl(sc->localip.s_addr),
  540                                             ntohl(sc->localmask.s_addr));
  541                                 break;
  542                             }
  543                         }
  544                         goto drop;
  545                     }
  546                 case ETHERTYPE_IP:
  547                         pep = &sc->inet;
  548                         break;
  549                 case ETHERTYPE_IPV6:
  550                         pep = &sc->inet6;
  551                         break;
  552                 case ETHERTYPE_AT:
  553                         pep = &sc->atalk;
  554                         break;
  555                 case ETHERTYPE_IPX:
  556                         pep = &sc->ipx;
  557                         break;
  558                 }
  559                 break;
  560         }
  561 
  562         /* Drop if payload is empty */
  563         if (m->m_pkthdr.len == 0) {
  564                 error = EINVAL;
  565                 goto drop;
  566         }
  567 
  568         /* Send it on */
  569         if (pep->hook == NULL)
  570                 goto drop;
  571         NG_FWD_NEW_DATA(error, item, pep->hook, m);
  572         return (error);
  573 
  574 drop:
  575         NG_FREE_ITEM(item);
  576         return (error);
  577 }
  578 
  579 
  580 /*
  581  * Send keepalive packets, every 10 seconds.
  582  */
  583 static void
  584 cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2)
  585 {
  586         const sc_p sc = arg1;
  587 
  588         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
  589         if (sc->seqRetries++ > 1)
  590                 cisco_notify(sc, NGM_LINK_IS_DOWN);
  591         ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
  592             &cisco_keepalive, (void *)sc, 0);
  593 }
  594 
  595 /*
  596  * Send Cisco keepalive packet.
  597  */
  598 static int
  599 cisco_send(sc_p sc, int type, long par1, long par2)
  600 {
  601         struct cisco_header *h;
  602         struct cisco_packet *ch;
  603         struct mbuf *m;
  604         struct timeval time;
  605         uint32_t t;
  606         int     error = 0;
  607 
  608         getmicrouptime(&time);
  609 
  610         MGETHDR(m, M_DONTWAIT, MT_DATA);
  611         if (!m)
  612                 return (ENOBUFS);
  613 
  614         t = time.tv_sec * 1000 + time.tv_usec / 1000;
  615         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
  616         m->m_pkthdr.rcvif = 0;
  617 
  618         h = mtod(m, struct cisco_header *);
  619         h->address = CISCO_MULTICAST;
  620         h->control = 0;
  621         h->protocol = htons(CISCO_KEEPALIVE);
  622 
  623         ch = (struct cisco_packet *) (h + 1);
  624         ch->type = htonl(type);
  625         ch->par1 = htonl(par1);
  626         ch->par2 = htonl(par2);
  627         ch->rel = -1;
  628         ch->time0 = htons((uint16_t) (t >> 16));
  629         ch->time1 = htons((uint16_t) t);
  630 
  631         NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
  632         return (error);
  633 }
  634 
  635 /*
  636  * Send linkstate to upstream node.
  637  */
  638 static void
  639 cisco_notify(sc_p sc, uint32_t cmd)
  640 {
  641         struct ng_mesg *msg;
  642         int dummy_error = 0;
  643 
  644         if (sc->inet.hook == NULL) /* nothing to notify */
  645                 return;
  646                 
  647         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  648         if (msg != NULL)
  649                 NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0);
  650 }

Cache object: e228058c970f54fb028673039f0ce90a


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