The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netgraph/ng_one2many.c

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    1 /*
    2  * ng_one2many.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 2000 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: Archie Cobbs <archie@freebsd.org>
   39  *
   40  * $FreeBSD: releng/12.0/sys/netgraph/ng_one2many.c 298813 2016-04-29 21:25:05Z pfg $
   41  */
   42 
   43 /*
   44  * ng_one2many(4) netgraph node type
   45  *
   46  * Packets received on the "one" hook are sent out each of the
   47  * "many" hooks according to an algorithm. Packets received on any
   48  * "many" hook are always delivered to the "one" hook.
   49  */
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/kernel.h>
   54 #include <sys/malloc.h>
   55 #include <sys/ctype.h>
   56 #include <sys/mbuf.h>
   57 #include <sys/errno.h>
   58 
   59 #include <netgraph/ng_message.h>
   60 #include <netgraph/netgraph.h>
   61 #include <netgraph/ng_parse.h>
   62 #include <netgraph/ng_one2many.h>
   63 
   64 /* Per-link private data */
   65 struct ng_one2many_link {
   66         hook_p                          hook;   /* netgraph hook */
   67         struct ng_one2many_link_stats   stats;  /* link stats */
   68 };
   69 
   70 /* Per-node private data */
   71 struct ng_one2many_private {
   72         node_p                          node;           /* link to node */
   73         struct ng_one2many_config       conf;           /* node configuration */
   74         struct ng_one2many_link         one;            /* "one" hook */
   75         struct ng_one2many_link         many[NG_ONE2MANY_MAX_LINKS];
   76         u_int16_t                       nextMany;       /* next round-robin */
   77         u_int16_t                       numActiveMany;  /* # active "many" */
   78         u_int16_t                       activeMany[NG_ONE2MANY_MAX_LINKS];
   79 };
   80 typedef struct ng_one2many_private *priv_p;
   81 
   82 /* Netgraph node methods */
   83 static ng_constructor_t ng_one2many_constructor;
   84 static ng_rcvmsg_t      ng_one2many_rcvmsg;
   85 static ng_shutdown_t    ng_one2many_shutdown;
   86 static ng_newhook_t     ng_one2many_newhook;
   87 static ng_rcvdata_t     ng_one2many_rcvdata;
   88 static ng_disconnect_t  ng_one2many_disconnect;
   89 
   90 /* Other functions */
   91 static void             ng_one2many_update_many(priv_p priv);
   92 static void             ng_one2many_notify(priv_p priv, uint32_t cmd);
   93 
   94 /******************************************************************
   95                     NETGRAPH PARSE TYPES
   96 ******************************************************************/
   97 
   98 /* Parse type for struct ng_one2many_config */
   99 static const struct ng_parse_fixedarray_info
  100     ng_one2many_enableLinks_array_type_info = {
  101         &ng_parse_uint8_type,
  102         NG_ONE2MANY_MAX_LINKS
  103 };
  104 static const struct ng_parse_type ng_one2many_enableLinks_array_type = {
  105         &ng_parse_fixedarray_type,
  106         &ng_one2many_enableLinks_array_type_info,
  107 };
  108 static const struct ng_parse_struct_field ng_one2many_config_type_fields[]
  109         = NG_ONE2MANY_CONFIG_TYPE_INFO(&ng_one2many_enableLinks_array_type);
  110 static const struct ng_parse_type ng_one2many_config_type = {
  111         &ng_parse_struct_type,
  112         &ng_one2many_config_type_fields
  113 };
  114 
  115 /* Parse type for struct ng_one2many_link_stats */
  116 static const struct ng_parse_struct_field ng_one2many_link_stats_type_fields[]
  117         = NG_ONE2MANY_LINK_STATS_TYPE_INFO;
  118 static const struct ng_parse_type ng_one2many_link_stats_type = {
  119         &ng_parse_struct_type,
  120         &ng_one2many_link_stats_type_fields
  121 };
  122 
  123 /* List of commands and how to convert arguments to/from ASCII */
  124 static const struct ng_cmdlist ng_one2many_cmdlist[] = {
  125         {
  126           NGM_ONE2MANY_COOKIE,
  127           NGM_ONE2MANY_SET_CONFIG,
  128           "setconfig",
  129           &ng_one2many_config_type,
  130           NULL
  131         },
  132         {
  133           NGM_ONE2MANY_COOKIE,
  134           NGM_ONE2MANY_GET_CONFIG,
  135           "getconfig",
  136           NULL,
  137           &ng_one2many_config_type
  138         },
  139         {
  140           NGM_ONE2MANY_COOKIE,
  141           NGM_ONE2MANY_GET_STATS,
  142           "getstats",
  143           &ng_parse_int32_type,
  144           &ng_one2many_link_stats_type
  145         },
  146         {
  147           NGM_ONE2MANY_COOKIE,
  148           NGM_ONE2MANY_CLR_STATS,
  149           "clrstats",
  150           &ng_parse_int32_type,
  151           NULL,
  152         },
  153         {
  154           NGM_ONE2MANY_COOKIE,
  155           NGM_ONE2MANY_GETCLR_STATS,
  156           "getclrstats",
  157           &ng_parse_int32_type,
  158           &ng_one2many_link_stats_type
  159         },
  160         { 0 }
  161 };
  162 
  163 /* Node type descriptor */
  164 static struct ng_type ng_one2many_typestruct = {
  165         .version =      NG_ABI_VERSION,
  166         .name =         NG_ONE2MANY_NODE_TYPE,
  167         .constructor =  ng_one2many_constructor,
  168         .rcvmsg =       ng_one2many_rcvmsg,
  169         .shutdown =     ng_one2many_shutdown,
  170         .newhook =      ng_one2many_newhook,
  171         .rcvdata =      ng_one2many_rcvdata,
  172         .disconnect =   ng_one2many_disconnect,
  173         .cmdlist =      ng_one2many_cmdlist,
  174 };
  175 NETGRAPH_INIT(one2many, &ng_one2many_typestruct);
  176 
  177 /******************************************************************
  178                     NETGRAPH NODE METHODS
  179 ******************************************************************/
  180 
  181 /*
  182  * Node constructor
  183  */
  184 static int
  185 ng_one2many_constructor(node_p node)
  186 {
  187         priv_p priv;
  188 
  189         /* Allocate and initialize private info */
  190         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  191         priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN;
  192         priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL;
  193 
  194         /* cross reference */
  195         NG_NODE_SET_PRIVATE(node, priv);
  196         priv->node = node;
  197 
  198         /* Done */
  199         return (0);
  200 }
  201 
  202 /*
  203  * Method for attaching a new hook
  204  */
  205 static  int
  206 ng_one2many_newhook(node_p node, hook_p hook, const char *name)
  207 {
  208         const priv_p priv = NG_NODE_PRIVATE(node);
  209         struct ng_one2many_link *link;
  210         int linkNum;
  211         u_long i;
  212 
  213         /* Which hook? */
  214         if (strncmp(name, NG_ONE2MANY_HOOK_MANY_PREFIX,
  215             strlen(NG_ONE2MANY_HOOK_MANY_PREFIX)) == 0) {
  216                 const char *cp;
  217                 char *eptr;
  218 
  219                 cp = name + strlen(NG_ONE2MANY_HOOK_MANY_PREFIX);
  220                 if (!isdigit(*cp) || (cp[0] == '' && cp[1] != '\0'))
  221                         return (EINVAL);
  222                 i = strtoul(cp, &eptr, 10);
  223                 if (*eptr != '\0' || i >= NG_ONE2MANY_MAX_LINKS)
  224                         return (EINVAL);
  225                 linkNum = (int)i;
  226                 link = &priv->many[linkNum];
  227         } else if (strcmp(name, NG_ONE2MANY_HOOK_ONE) == 0) {
  228                 linkNum = NG_ONE2MANY_ONE_LINKNUM;
  229                 link = &priv->one;
  230         } else
  231                 return (EINVAL);
  232 
  233         /* Is hook already connected? (should never happen) */
  234         if (link->hook != NULL)
  235                 return (EISCONN);
  236 
  237         /* Setup private info for this link */
  238         NG_HOOK_SET_PRIVATE(hook, (void *)(intptr_t)linkNum);
  239         link->hook = hook;
  240         bzero(&link->stats, sizeof(link->stats));
  241         if (linkNum != NG_ONE2MANY_ONE_LINKNUM) {
  242                 priv->conf.enabledLinks[linkNum] = 1;   /* auto-enable link */
  243                 ng_one2many_update_many(priv);
  244         }
  245 
  246         /* Done */
  247         return (0);
  248 }
  249 
  250 /*
  251  * Receive a control message
  252  */
  253 static int
  254 ng_one2many_rcvmsg(node_p node, item_p item, hook_p lasthook)
  255 {
  256         const priv_p priv = NG_NODE_PRIVATE(node);
  257         struct ng_mesg *resp = NULL;
  258         int error = 0;
  259         struct ng_mesg *msg;
  260 
  261         NGI_GET_MSG(item, msg);
  262         switch (msg->header.typecookie) {
  263         case NGM_ONE2MANY_COOKIE:
  264                 switch (msg->header.cmd) {
  265                 case NGM_ONE2MANY_SET_CONFIG:
  266                     {
  267                         struct ng_one2many_config *conf;
  268                         int i;
  269 
  270                         /* Check that new configuration is valid */
  271                         if (msg->header.arglen != sizeof(*conf)) {
  272                                 error = EINVAL;
  273                                 break;
  274                         }
  275                         conf = (struct ng_one2many_config *)msg->data;
  276                         switch (conf->xmitAlg) {
  277                         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  278                         case NG_ONE2MANY_XMIT_ALL:
  279                         case NG_ONE2MANY_XMIT_FAILOVER:
  280                                 break;
  281                         default:
  282                                 error = EINVAL;
  283                                 break;
  284                         }
  285                         switch (conf->failAlg) {
  286                         case NG_ONE2MANY_FAIL_MANUAL:
  287                         case NG_ONE2MANY_FAIL_NOTIFY:
  288                                 break;
  289                         default:
  290                                 error = EINVAL;
  291                                 break;
  292                         }
  293                         if (error != 0)
  294                                 break;
  295 
  296                         /* Normalized many link enabled bits */ 
  297                         for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++)
  298                                 conf->enabledLinks[i] = !!conf->enabledLinks[i];
  299 
  300                         /* Copy config and reset */
  301                         bcopy(conf, &priv->conf, sizeof(*conf));
  302                         ng_one2many_update_many(priv);
  303                         break;
  304                     }
  305                 case NGM_ONE2MANY_GET_CONFIG:
  306                     {
  307                         struct ng_one2many_config *conf;
  308 
  309                         NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
  310                         if (resp == NULL) {
  311                                 error = ENOMEM;
  312                                 break;
  313                         }
  314                         conf = (struct ng_one2many_config *)resp->data;
  315                         bcopy(&priv->conf, conf, sizeof(priv->conf));
  316                         break;
  317                     }
  318                 case NGM_ONE2MANY_GET_STATS:
  319                 case NGM_ONE2MANY_CLR_STATS:
  320                 case NGM_ONE2MANY_GETCLR_STATS:
  321                     {
  322                         struct ng_one2many_link *link;
  323                         int linkNum;
  324 
  325                         /* Get link */
  326                         if (msg->header.arglen != sizeof(int32_t)) {
  327                                 error = EINVAL;
  328                                 break;
  329                         }
  330                         linkNum = *((int32_t *)msg->data);
  331                         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  332                                 link = &priv->one;
  333                         else if (linkNum >= 0
  334                             && linkNum < NG_ONE2MANY_MAX_LINKS) {
  335                                 link = &priv->many[linkNum];
  336                         } else {
  337                                 error = EINVAL;
  338                                 break;
  339                         }
  340 
  341                         /* Get/clear stats */
  342                         if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) {
  343                                 NG_MKRESPONSE(resp, msg,
  344                                     sizeof(link->stats), M_NOWAIT);
  345                                 if (resp == NULL) {
  346                                         error = ENOMEM;
  347                                         break;
  348                                 }
  349                                 bcopy(&link->stats,
  350                                     resp->data, sizeof(link->stats));
  351                         }
  352                         if (msg->header.cmd != NGM_ONE2MANY_GET_STATS)
  353                                 bzero(&link->stats, sizeof(link->stats));
  354                         break;
  355                     }
  356                 default:
  357                         error = EINVAL;
  358                         break;
  359                 }
  360                 break;
  361         /*
  362          * One of our downstreams notifies us of link change. If we are
  363          * configured to listen to these message, then we remove/add
  364          * this hook from array of active hooks.
  365          */
  366         case NGM_FLOW_COOKIE:
  367             {
  368                 int linkNum;
  369 
  370                 if (priv->conf.failAlg != NG_ONE2MANY_FAIL_NOTIFY)
  371                         break;
  372 
  373                 if (lasthook == NULL)
  374                         break;
  375 
  376                 linkNum = (intptr_t)NG_HOOK_PRIVATE(lasthook);
  377                 if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  378                         break;
  379 
  380                 KASSERT((linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  381                     ("%s: linkNum=%d", __func__, linkNum));
  382 
  383                 switch (msg->header.cmd) {
  384                 case NGM_LINK_IS_UP:
  385                         priv->conf.enabledLinks[linkNum] = 1;
  386                         ng_one2many_update_many(priv);
  387                         break;
  388                 case NGM_LINK_IS_DOWN:
  389                         priv->conf.enabledLinks[linkNum] = 0;
  390                         ng_one2many_update_many(priv);
  391                         break;
  392                 default:
  393                         break;
  394                 }
  395                 break;
  396             }
  397         default:
  398                 error = EINVAL;
  399                 break;
  400         }
  401 
  402         /* Done */
  403         NG_RESPOND_MSG(error, node, item, resp);
  404         NG_FREE_MSG(msg);
  405         return (error);
  406 }
  407 
  408 /*
  409  * Receive data on a hook
  410  */
  411 static int
  412 ng_one2many_rcvdata(hook_p hook, item_p item)
  413 {
  414         const node_p node = NG_HOOK_NODE(hook);
  415         const priv_p priv = NG_NODE_PRIVATE(node);
  416         struct ng_one2many_link *src;
  417         struct ng_one2many_link *dst = NULL;
  418         int error = 0;
  419         int linkNum;
  420         int i;
  421         struct mbuf *m;
  422 
  423         m = NGI_M(item); /* just peaking, mbuf still owned by item */
  424         /* Get link number */
  425         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  426         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  427             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  428             ("%s: linkNum=%d", __func__, linkNum));
  429 
  430         /* Figure out source link */
  431         src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
  432             &priv->one : &priv->many[linkNum];
  433         KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum));
  434 
  435         /* Update receive stats */
  436         src->stats.recvPackets++;
  437         src->stats.recvOctets += m->m_pkthdr.len;
  438 
  439         /* Figure out destination link */
  440         if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
  441                 if (priv->numActiveMany == 0) {
  442                         NG_FREE_ITEM(item);
  443                         return (ENOTCONN);
  444                 }
  445                 switch(priv->conf.xmitAlg) {
  446                 case NG_ONE2MANY_XMIT_ROUNDROBIN:
  447                         dst = &priv->many[priv->activeMany[priv->nextMany]];
  448                         priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
  449                         break;
  450                 case NG_ONE2MANY_XMIT_ALL:
  451                         /* no need to copy data for the 1st one */
  452                         dst = &priv->many[priv->activeMany[0]];
  453 
  454                         /* make copies of data and send for all links
  455                          * except the first one, which we'll do last 
  456                          */
  457                         for (i = 1; i < priv->numActiveMany; i++) {
  458                                 struct mbuf *m2;
  459                                 struct ng_one2many_link *mdst;
  460 
  461                                 mdst = &priv->many[priv->activeMany[i]];
  462                                 m2 = m_dup(m, M_NOWAIT);        /* XXX m_copypacket() */
  463                                 if (m2 == NULL) {
  464                                         mdst->stats.memoryFailures++;
  465                                         NG_FREE_ITEM(item);
  466                                         NG_FREE_M(m);
  467                                         return (ENOBUFS);
  468                                 }
  469                                 /* Update transmit stats */
  470                                 mdst->stats.xmitPackets++;
  471                                 mdst->stats.xmitOctets += m->m_pkthdr.len;
  472                                 NG_SEND_DATA_ONLY(error, mdst->hook, m2);
  473                         }
  474                         break;
  475                 case NG_ONE2MANY_XMIT_FAILOVER:
  476                         dst = &priv->many[priv->activeMany[0]];
  477                         break;
  478 #ifdef INVARIANTS
  479                 default:
  480                         panic("%s: invalid xmitAlg", __func__);
  481 #endif
  482                 }
  483         } else {
  484                 dst = &priv->one;
  485         }
  486 
  487         /* Update transmit stats */
  488         dst->stats.xmitPackets++;
  489         dst->stats.xmitOctets += m->m_pkthdr.len;
  490 
  491         /* Deliver packet */
  492         NG_FWD_ITEM_HOOK(error, item, dst->hook);
  493         return (error);
  494 }
  495 
  496 /*
  497  * Shutdown node
  498  */
  499 static int
  500 ng_one2many_shutdown(node_p node)
  501 {
  502         const priv_p priv = NG_NODE_PRIVATE(node);
  503 
  504         KASSERT(priv->numActiveMany == 0,
  505             ("%s: numActiveMany=%d", __func__, priv->numActiveMany));
  506         free(priv, M_NETGRAPH);
  507         NG_NODE_SET_PRIVATE(node, NULL);
  508         NG_NODE_UNREF(node);
  509         return (0);
  510 }
  511 
  512 /*
  513  * Hook disconnection.
  514  */
  515 static int
  516 ng_one2many_disconnect(hook_p hook)
  517 {
  518         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  519         int linkNum;
  520 
  521         /* Get link number */
  522         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  523         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  524             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  525             ("%s: linkNum=%d", __func__, linkNum));
  526 
  527         /* Nuke the link */
  528         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  529                 priv->one.hook = NULL;
  530         else {
  531                 priv->many[linkNum].hook = NULL;
  532                 priv->conf.enabledLinks[linkNum] = 0;
  533                 ng_one2many_update_many(priv);
  534         }
  535 
  536         /* If no hooks left, go away */
  537         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  538         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  539                 ng_rmnode_self(NG_HOOK_NODE(hook));
  540         return (0);
  541 }
  542 
  543 /******************************************************************
  544                         OTHER FUNCTIONS
  545 ******************************************************************/
  546 
  547 /*
  548  * Update internal state after the addition or removal of a "many" link
  549  */
  550 static void
  551 ng_one2many_update_many(priv_p priv)
  552 {
  553         uint16_t saveActive = priv->numActiveMany;
  554         int linkNum;
  555 
  556         /* Update list of which "many" links are up */
  557         priv->numActiveMany = 0;
  558         for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
  559                 switch (priv->conf.failAlg) {
  560                 case NG_ONE2MANY_FAIL_MANUAL:
  561                 case NG_ONE2MANY_FAIL_NOTIFY:
  562                         if (priv->many[linkNum].hook != NULL
  563                             && priv->conf.enabledLinks[linkNum]) {
  564                                 priv->activeMany[priv->numActiveMany] = linkNum;
  565                                 priv->numActiveMany++;
  566                         }
  567                         break;
  568 #ifdef INVARIANTS
  569                 default:
  570                         panic("%s: invalid failAlg", __func__);
  571 #endif
  572                 }
  573         }
  574 
  575         if (priv->numActiveMany == 0 && saveActive > 0)
  576                 ng_one2many_notify(priv, NGM_LINK_IS_DOWN);
  577 
  578         if (saveActive == 0 && priv->numActiveMany > 0)
  579                 ng_one2many_notify(priv, NGM_LINK_IS_UP);
  580 
  581         /* Update transmit algorithm state */
  582         switch (priv->conf.xmitAlg) {
  583         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  584                 if (priv->numActiveMany > 0)
  585                         priv->nextMany %= priv->numActiveMany;
  586                 break;
  587         case NG_ONE2MANY_XMIT_ALL:
  588         case NG_ONE2MANY_XMIT_FAILOVER:
  589                 break;
  590 #ifdef INVARIANTS
  591         default:
  592                 panic("%s: invalid xmitAlg", __func__);
  593 #endif
  594         }
  595 }
  596 
  597 /*
  598  * Notify upstream if we are out of links, or we have at least one link.
  599  */
  600 static void
  601 ng_one2many_notify(priv_p priv, uint32_t cmd)
  602 {
  603         struct ng_mesg *msg;
  604         int dummy_error = 0;
  605 
  606         if (priv->one.hook == NULL)
  607                 return;
  608 
  609         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  610         if (msg != NULL)
  611                 NG_SEND_MSG_HOOK(dummy_error, priv->node, msg, priv->one.hook, 0);
  612 }

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