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/11.2/sys/netgraph/ng_cisco.c 263152 2014-03-14 06:29:43Z 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 <netgraph/ng_message.h>
   59 #include <netgraph/netgraph.h>
   60 #include <netgraph/ng_parse.h>
   61 #include <netgraph/ng_cisco.h>
   62 
   63 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
   64 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
   65 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
   66 #define CISCO_ADDR_REQ          0       /* Cisco address request */
   67 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
   68 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
   69 
   70 #define KEEPALIVE_SECS          10
   71 
   72 struct cisco_header {
   73         uint8_t  address;
   74         uint8_t  control;
   75         uint16_t protocol;
   76 } __packed;
   77 
   78 #define CISCO_HEADER_LEN        sizeof (struct cisco_header)
   79 
   80 struct cisco_packet {
   81         uint32_t type;
   82         uint32_t par1;
   83         uint32_t par2;
   84         uint16_t rel;
   85         uint16_t time0;
   86         uint16_t time1;
   87 } __packed;
   88 
   89 #define CISCO_PACKET_LEN (sizeof(struct cisco_packet))
   90 
   91 struct protoent {
   92         hook_p  hook;           /* the hook for this proto */
   93         uint16_t af;            /* address family, -1 = downstream */
   94 };
   95 
   96 struct cisco_priv {
   97         uint32_t local_seq;
   98         uint32_t remote_seq;
   99         uint32_t seqRetries;    /* how many times we've been here throwing out
  100                                  * the same sequence number without ack */
  101         node_p  node;
  102         struct callout handle;
  103         struct protoent downstream;
  104         struct protoent inet;           /* IP information */
  105         struct in_addr localip;
  106         struct in_addr localmask;
  107         struct protoent inet6;          /* IPv6 information */
  108         struct protoent atalk;          /* AppleTalk information */
  109         struct protoent ipx;            /* IPX information */
  110 };
  111 typedef struct cisco_priv *sc_p;
  112 
  113 /* Netgraph methods */
  114 static ng_constructor_t         cisco_constructor;
  115 static ng_rcvmsg_t              cisco_rcvmsg;
  116 static ng_shutdown_t            cisco_shutdown;
  117 static ng_newhook_t             cisco_newhook;
  118 static ng_rcvdata_t             cisco_rcvdata;
  119 static ng_disconnect_t          cisco_disconnect;
  120 
  121 /* Other functions */
  122 static int      cisco_input(sc_p sc, item_p item);
  123 static void     cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2);
  124 static int      cisco_send(sc_p sc, int type, long par1, long par2);
  125 static void     cisco_notify(sc_p sc, uint32_t cmd);
  126 
  127 /* Parse type for struct ng_cisco_ipaddr */
  128 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
  129         = NG_CISCO_IPADDR_TYPE_INFO;
  130 static const struct ng_parse_type ng_cisco_ipaddr_type = {
  131         &ng_parse_struct_type,
  132         &ng_cisco_ipaddr_type_fields
  133 };
  134 
  135 /* Parse type for struct ng_async_stat */
  136 static const struct ng_parse_struct_field ng_cisco_stats_type_fields[]
  137         = NG_CISCO_STATS_TYPE_INFO;
  138 static const struct ng_parse_type ng_cisco_stats_type = {
  139         &ng_parse_struct_type,
  140         &ng_cisco_stats_type_fields
  141 };
  142 
  143 /* List of commands and how to convert arguments to/from ASCII */
  144 static const struct ng_cmdlist ng_cisco_cmdlist[] = {
  145         {
  146           NGM_CISCO_COOKIE,
  147           NGM_CISCO_SET_IPADDR,
  148           "setipaddr",
  149           &ng_cisco_ipaddr_type,
  150           NULL
  151         },
  152         {
  153           NGM_CISCO_COOKIE,
  154           NGM_CISCO_GET_IPADDR,
  155           "getipaddr",
  156           NULL,
  157           &ng_cisco_ipaddr_type
  158         },
  159         {
  160           NGM_CISCO_COOKIE,
  161           NGM_CISCO_GET_STATUS,
  162           "getstats",
  163           NULL,
  164           &ng_cisco_stats_type
  165         },
  166         { 0 }
  167 };
  168 
  169 /* Node type */
  170 static struct ng_type typestruct = {
  171         .version =      NG_ABI_VERSION,
  172         .name =         NG_CISCO_NODE_TYPE,
  173         .constructor =  cisco_constructor,
  174         .rcvmsg =       cisco_rcvmsg,
  175         .shutdown =     cisco_shutdown,
  176         .newhook =      cisco_newhook,
  177         .rcvdata =      cisco_rcvdata,
  178         .disconnect =   cisco_disconnect,
  179         .cmdlist =      ng_cisco_cmdlist,
  180 };
  181 NETGRAPH_INIT(cisco, &typestruct);
  182 
  183 /*
  184  * Node constructor
  185  */
  186 static int
  187 cisco_constructor(node_p node)
  188 {
  189         sc_p sc;
  190 
  191         sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO);
  192 
  193         ng_callout_init(&sc->handle);
  194         NG_NODE_SET_PRIVATE(node, sc);
  195         sc->node = node;
  196 
  197         /* Initialise the varous protocol hook holders */
  198         sc->downstream.af = 0xffff;
  199         sc->inet.af = AF_INET;
  200         sc->inet6.af = AF_INET6;
  201         sc->atalk.af = AF_APPLETALK;
  202         sc->ipx.af = AF_IPX;
  203         return (0);
  204 }
  205 
  206 /*
  207  * Check new hook
  208  */
  209 static int
  210 cisco_newhook(node_p node, hook_p hook, const char *name)
  211 {
  212         const sc_p sc = NG_NODE_PRIVATE(node);
  213 
  214         if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) {
  215                 sc->downstream.hook = hook;
  216                 NG_HOOK_SET_PRIVATE(hook, &sc->downstream);
  217 
  218                 /* Start keepalives */
  219                 ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
  220                     &cisco_keepalive, (void *)sc, 0);
  221         } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) {
  222                 sc->inet.hook = hook;
  223                 NG_HOOK_SET_PRIVATE(hook, &sc->inet);
  224         } else if (strcmp(name, NG_CISCO_HOOK_INET6) == 0) {
  225                 sc->inet6.hook = hook;
  226                 NG_HOOK_SET_PRIVATE(hook, &sc->inet6);
  227         } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) {
  228                 sc->atalk.hook = hook;
  229                 NG_HOOK_SET_PRIVATE(hook, &sc->atalk);
  230         } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) {
  231                 sc->ipx.hook = hook;
  232                 NG_HOOK_SET_PRIVATE(hook, &sc->ipx);
  233         } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) {
  234                 NG_HOOK_SET_PRIVATE(hook, NULL);        /* unimplemented */
  235         } else
  236                 return (EINVAL);
  237         return 0;
  238 }
  239 
  240 /*
  241  * Receive control message.
  242  */
  243 static int
  244 cisco_rcvmsg(node_p node, item_p item, hook_p lasthook)
  245 {
  246         struct ng_mesg *msg;
  247         const sc_p sc = NG_NODE_PRIVATE(node);
  248         struct ng_mesg *resp = NULL;
  249         int error = 0;
  250 
  251         NGI_GET_MSG(item, msg);
  252         switch (msg->header.typecookie) {
  253         case NGM_GENERIC_COOKIE:
  254                 switch (msg->header.cmd) {
  255                 case NGM_TEXT_STATUS:
  256                     {
  257                         char *arg;
  258                         int pos;
  259 
  260                         NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
  261                         if (resp == NULL) {
  262                                 error = ENOMEM;
  263                                 break;
  264                         }
  265                         arg = (char *) resp->data;
  266                         pos = sprintf(arg,
  267                           "keepalive period: %d sec; ", KEEPALIVE_SECS);
  268                         pos += sprintf(arg + pos,
  269                           "unacknowledged keepalives: %d", sc->seqRetries);
  270                         resp->header.arglen = pos + 1;
  271                         break;
  272                     }
  273                 default:
  274                         error = EINVAL;
  275                         break;
  276                 }
  277                 break;
  278         case NGM_CISCO_COOKIE:
  279                 switch (msg->header.cmd) {
  280                 case NGM_CISCO_GET_IPADDR:      /* could be a late reply! */
  281                         if ((msg->header.flags & NGF_RESP) == 0) {
  282                                 struct in_addr *ips;
  283 
  284                                 NG_MKRESPONSE(resp, msg,
  285                                     2 * sizeof(*ips), M_NOWAIT);
  286                                 if (!resp) {
  287                                         error = ENOMEM;
  288                                         break;
  289                                 }
  290                                 ips = (struct in_addr *) resp->data;
  291                                 ips[0] = sc->localip;
  292                                 ips[1] = sc->localmask;
  293                                 break;
  294                         }
  295                         /* FALLTHROUGH */       /* ...if it's a reply */
  296                 case NGM_CISCO_SET_IPADDR:
  297                     {
  298                         struct in_addr *const ips = (struct in_addr *)msg->data;
  299 
  300                         if (msg->header.arglen < 2 * sizeof(*ips)) {
  301                                 error = EINVAL;
  302                                 break;
  303                         }
  304                         sc->localip = ips[0];
  305                         sc->localmask = ips[1];
  306                         break;
  307                     }
  308                 case NGM_CISCO_GET_STATUS:
  309                     {
  310                         struct ng_cisco_stats *stat;
  311 
  312                         NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
  313                         if (!resp) {
  314                                 error = ENOMEM;
  315                                 break;
  316                         }
  317                         stat = (struct ng_cisco_stats *)resp->data;
  318                         stat->seqRetries = sc->seqRetries;
  319                         stat->keepAlivePeriod = KEEPALIVE_SECS;
  320                         break;
  321                     }
  322                 default:
  323                         error = EINVAL;
  324                         break;
  325                 }
  326                 break;
  327         default:
  328                 error = EINVAL;
  329                 break;
  330         }
  331         NG_RESPOND_MSG(error, node, item, resp);
  332         NG_FREE_MSG(msg);
  333         return (error);
  334 }
  335 
  336 /*
  337  * Receive data
  338  */
  339 static int
  340 cisco_rcvdata(hook_p hook, item_p item)
  341 {
  342         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  343         struct protoent *pep;
  344         struct cisco_header *h;
  345         struct mbuf *m;
  346         int error = 0;
  347 
  348         if ((pep = NG_HOOK_PRIVATE(hook)) == NULL)
  349                 goto out;
  350 
  351         /* If it came from our downlink, deal with it separately */
  352         if (pep->af == 0xffff)
  353                 return (cisco_input(sc, item));
  354 
  355         /* OK so it came from a protocol, heading out. Prepend general data
  356            packet header. For now, IP,IPX only  */
  357         NGI_GET_M(item, m);
  358         M_PREPEND(m, CISCO_HEADER_LEN, M_NOWAIT);
  359         if (!m) {
  360                 error = ENOBUFS;
  361                 goto out;
  362         }
  363         NGI_M(item) = m;
  364         h = mtod(m, struct cisco_header *);
  365         h->address = CISCO_UNICAST;
  366         h->control = 0;
  367 
  368         switch (pep->af) {
  369         case AF_INET:           /* Internet Protocol */
  370                 h->protocol = htons(ETHERTYPE_IP);
  371                 break;
  372         case AF_INET6:
  373                 h->protocol = htons(ETHERTYPE_IPV6);
  374                 break;
  375         case AF_APPLETALK:      /* AppleTalk Protocol */
  376                 h->protocol = htons(ETHERTYPE_AT);
  377                 break;
  378         case AF_IPX:            /* Novell IPX Protocol */
  379                 h->protocol = htons(ETHERTYPE_IPX);
  380                 break;
  381         default:
  382                 error = EAFNOSUPPORT;
  383                 goto out;
  384         }
  385 
  386         /* Send it */
  387         NG_FWD_NEW_DATA(error, item,  sc->downstream.hook, m);
  388         return (error);
  389 
  390 out:
  391         NG_FREE_ITEM(item);
  392         return (error);
  393 }
  394 
  395 /*
  396  * Shutdown node
  397  */
  398 static int
  399 cisco_shutdown(node_p node)
  400 {
  401         const sc_p sc = NG_NODE_PRIVATE(node);
  402 
  403         NG_NODE_SET_PRIVATE(node, NULL);
  404         NG_NODE_UNREF(sc->node);
  405         free(sc, M_NETGRAPH);
  406         return (0);
  407 }
  408 
  409 /*
  410  * Disconnection of a hook
  411  *
  412  * For this type, removal of the last link destroys the node
  413  */
  414 static int
  415 cisco_disconnect(hook_p hook)
  416 {
  417         const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  418         struct protoent *pep;
  419 
  420         /* Check it's not the debug hook */
  421         if ((pep = NG_HOOK_PRIVATE(hook))) {
  422                 pep->hook = NULL;
  423                 if (pep->af == 0xffff)
  424                         /* If it is the downstream hook, stop the timers */
  425                         ng_uncallout(&sc->handle, NG_HOOK_NODE(hook));
  426         }
  427 
  428         /* If no more hooks, remove the node */
  429         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  430         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  431                 ng_rmnode_self(NG_HOOK_NODE(hook));
  432         return (0);
  433 }
  434 
  435 /*
  436  * Receive data
  437  */
  438 static int
  439 cisco_input(sc_p sc, item_p item)
  440 {
  441         const struct cisco_header *h;
  442         struct cisco_header hdrbuf;
  443         struct protoent *pep;
  444         struct mbuf *m;
  445         int error = 0;
  446 
  447         /* Get data */
  448         m = NGI_M(item);
  449 
  450         /* Sanity check header length */
  451         if (m->m_pkthdr.len < sizeof(*h)) {
  452                 error = EINVAL;
  453                 goto drop;
  454         }
  455 
  456         /* Get cisco header */
  457         if (m->m_len >= sizeof(*h))                     /* the common case */
  458                 h = mtod(m, const struct cisco_header *);
  459         else {
  460                 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf);
  461                 h = &hdrbuf;
  462         }
  463         m_adj(m, sizeof(*h));
  464 
  465         /* Check header address */
  466         switch (h->address) {
  467         default:                /* Invalid Cisco packet. */
  468                 goto drop;
  469         case CISCO_UNICAST:
  470         case CISCO_MULTICAST:
  471                 /* Don't check the control field here (RFC 1547). */
  472                 switch (ntohs(h->protocol)) {
  473                 default:
  474                         goto drop;
  475                 case CISCO_KEEPALIVE:
  476                     {
  477                         const struct cisco_packet *p;
  478                         struct cisco_packet pktbuf;
  479 
  480                         /* Sanity check packet length */
  481                         if (m->m_pkthdr.len < sizeof(*p)) {
  482                                 error = EINVAL;
  483                                 goto drop;
  484                         }
  485 
  486                         /* Get cisco packet */
  487                         if (m->m_len >= sizeof(*p))     /* the common case */
  488                                 p = mtod(m, const struct cisco_packet *);
  489                         else {
  490                                 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf);
  491                                 p = &pktbuf;
  492                         }
  493 
  494                         /* Check packet type */
  495                         switch (ntohl(p->type)) {
  496                         default:
  497                                 log(LOG_WARNING,
  498                                     "cisco: unknown cisco packet type: 0x%lx\n",
  499                                        (long)ntohl(p->type));
  500                                 break;
  501                         case CISCO_ADDR_REPLY:
  502                                 /* Reply on address request, ignore */
  503                                 break;
  504                         case CISCO_KEEPALIVE_REQ:
  505                                 sc->remote_seq = ntohl(p->par1);
  506                                 if (sc->local_seq == ntohl(p->par2)) {
  507                                         sc->local_seq++;
  508                                         if (sc->seqRetries > 1)
  509                                                 cisco_notify(sc, NGM_LINK_IS_UP);
  510                                         sc->seqRetries = 0;
  511                                 }
  512                                 break;
  513                         case CISCO_ADDR_REQ:
  514                             {
  515                                 struct ng_mesg *msg;
  516                                 int dummy_error = 0;
  517 
  518                                 /* Ask inet peer for IP address information */
  519                                 if (sc->inet.hook == NULL)
  520                                         goto nomsg;
  521                                 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE,
  522                                     NGM_CISCO_GET_IPADDR, 0, M_NOWAIT);
  523                                 if (msg == NULL)
  524                                         goto nomsg;
  525                                 NG_SEND_MSG_HOOK(dummy_error,
  526                                     sc->node, msg, sc->inet.hook, 0);
  527                 /*
  528                  * XXX Now maybe we should set a flag telling
  529                  * our receiver to send this message when the response comes in
  530                  * instead of now when the data may be bad.
  531                  */
  532                 nomsg:
  533                                 /* Send reply to peer device */
  534                                 error = cisco_send(sc, CISCO_ADDR_REPLY,
  535                                             ntohl(sc->localip.s_addr),
  536                                             ntohl(sc->localmask.s_addr));
  537                                 break;
  538                             }
  539                         }
  540                         goto drop;
  541                     }
  542                 case ETHERTYPE_IP:
  543                         pep = &sc->inet;
  544                         break;
  545                 case ETHERTYPE_IPV6:
  546                         pep = &sc->inet6;
  547                         break;
  548                 case ETHERTYPE_AT:
  549                         pep = &sc->atalk;
  550                         break;
  551                 case ETHERTYPE_IPX:
  552                         pep = &sc->ipx;
  553                         break;
  554                 }
  555                 break;
  556         }
  557 
  558         /* Drop if payload is empty */
  559         if (m->m_pkthdr.len == 0) {
  560                 error = EINVAL;
  561                 goto drop;
  562         }
  563 
  564         /* Send it on */
  565         if (pep->hook == NULL)
  566                 goto drop;
  567         NG_FWD_NEW_DATA(error, item, pep->hook, m);
  568         return (error);
  569 
  570 drop:
  571         NG_FREE_ITEM(item);
  572         return (error);
  573 }
  574 
  575 
  576 /*
  577  * Send keepalive packets, every 10 seconds.
  578  */
  579 static void
  580 cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2)
  581 {
  582         const sc_p sc = arg1;
  583 
  584         cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq);
  585         if (sc->seqRetries++ > 1)
  586                 cisco_notify(sc, NGM_LINK_IS_DOWN);
  587         ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS),
  588             &cisco_keepalive, (void *)sc, 0);
  589 }
  590 
  591 /*
  592  * Send Cisco keepalive packet.
  593  */
  594 static int
  595 cisco_send(sc_p sc, int type, long par1, long par2)
  596 {
  597         struct cisco_header *h;
  598         struct cisco_packet *ch;
  599         struct mbuf *m;
  600         struct timeval time;
  601         uint32_t t;
  602         int     error = 0;
  603 
  604         getmicrouptime(&time);
  605 
  606         MGETHDR(m, M_NOWAIT, MT_DATA);
  607         if (!m)
  608                 return (ENOBUFS);
  609 
  610         t = time.tv_sec * 1000 + time.tv_usec / 1000;
  611         m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN;
  612         m->m_pkthdr.rcvif = 0;
  613 
  614         h = mtod(m, struct cisco_header *);
  615         h->address = CISCO_MULTICAST;
  616         h->control = 0;
  617         h->protocol = htons(CISCO_KEEPALIVE);
  618 
  619         ch = (struct cisco_packet *) (h + 1);
  620         ch->type = htonl(type);
  621         ch->par1 = htonl(par1);
  622         ch->par2 = htonl(par2);
  623         ch->rel = -1;
  624         ch->time0 = htons((uint16_t) (t >> 16));
  625         ch->time1 = htons((uint16_t) t);
  626 
  627         NG_SEND_DATA_ONLY(error, sc->downstream.hook, m);
  628         return (error);
  629 }
  630 
  631 /*
  632  * Send linkstate to upstream node.
  633  */
  634 static void
  635 cisco_notify(sc_p sc, uint32_t cmd)
  636 {
  637         struct ng_mesg *msg;
  638         int dummy_error = 0;
  639 
  640         if (sc->inet.hook == NULL) /* nothing to notify */
  641                 return;
  642                 
  643         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  644         if (msg != NULL)
  645                 NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0);
  646 }

Cache object: 7b5612d63ec3b8236a1e8009d17ff3af


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