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/8.1/sys/netgraph/ng_one2many.c 199583 2009-11-20 15:27:52Z jhb $
   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 accoring 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_NOWAIT | M_ZERO);
  191         if (priv == NULL)
  192                 return (ENOMEM);
  193         priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN;
  194         priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL;
  195 
  196         /* cross reference */
  197         NG_NODE_SET_PRIVATE(node, priv);
  198         priv->node = node;
  199 
  200         /* Done */
  201         return (0);
  202 }
  203 
  204 /*
  205  * Method for attaching a new hook
  206  */
  207 static  int
  208 ng_one2many_newhook(node_p node, hook_p hook, const char *name)
  209 {
  210         const priv_p priv = NG_NODE_PRIVATE(node);
  211         struct ng_one2many_link *link;
  212         int linkNum;
  213         u_long i;
  214 
  215         /* Which hook? */
  216         if (strncmp(name, NG_ONE2MANY_HOOK_MANY_PREFIX,
  217             strlen(NG_ONE2MANY_HOOK_MANY_PREFIX)) == 0) {
  218                 const char *cp;
  219                 char *eptr;
  220 
  221                 cp = name + strlen(NG_ONE2MANY_HOOK_MANY_PREFIX);
  222                 if (!isdigit(*cp) || (cp[0] == '' && cp[1] != '\0'))
  223                         return (EINVAL);
  224                 i = strtoul(cp, &eptr, 10);
  225                 if (*eptr != '\0' || i < 0 || i >= NG_ONE2MANY_MAX_LINKS)
  226                         return (EINVAL);
  227                 linkNum = (int)i;
  228                 link = &priv->many[linkNum];
  229         } else if (strcmp(name, NG_ONE2MANY_HOOK_ONE) == 0) {
  230                 linkNum = NG_ONE2MANY_ONE_LINKNUM;
  231                 link = &priv->one;
  232         } else
  233                 return (EINVAL);
  234 
  235         /* Is hook already connected? (should never happen) */
  236         if (link->hook != NULL)
  237                 return (EISCONN);
  238 
  239         /* Setup private info for this link */
  240         NG_HOOK_SET_PRIVATE(hook, (void *)(intptr_t)linkNum);
  241         link->hook = hook;
  242         bzero(&link->stats, sizeof(link->stats));
  243         if (linkNum != NG_ONE2MANY_ONE_LINKNUM) {
  244                 priv->conf.enabledLinks[linkNum] = 1;   /* auto-enable link */
  245                 ng_one2many_update_many(priv);
  246         }
  247 
  248         /* Done */
  249         return (0);
  250 }
  251 
  252 /*
  253  * Receive a control message
  254  */
  255 static int
  256 ng_one2many_rcvmsg(node_p node, item_p item, hook_p lasthook)
  257 {
  258         const priv_p priv = NG_NODE_PRIVATE(node);
  259         struct ng_mesg *resp = NULL;
  260         int error = 0;
  261         struct ng_mesg *msg;
  262 
  263         NGI_GET_MSG(item, msg);
  264         switch (msg->header.typecookie) {
  265         case NGM_ONE2MANY_COOKIE:
  266                 switch (msg->header.cmd) {
  267                 case NGM_ONE2MANY_SET_CONFIG:
  268                     {
  269                         struct ng_one2many_config *conf;
  270                         int i;
  271 
  272                         /* Check that new configuration is valid */
  273                         if (msg->header.arglen != sizeof(*conf)) {
  274                                 error = EINVAL;
  275                                 break;
  276                         }
  277                         conf = (struct ng_one2many_config *)msg->data;
  278                         switch (conf->xmitAlg) {
  279                         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  280                         case NG_ONE2MANY_XMIT_ALL:
  281                                 break;
  282                         default:
  283                                 error = EINVAL;
  284                                 break;
  285                         }
  286                         switch (conf->failAlg) {
  287                         case NG_ONE2MANY_FAIL_MANUAL:
  288                         case NG_ONE2MANY_FAIL_NOTIFY:
  289                                 break;
  290                         default:
  291                                 error = EINVAL;
  292                                 break;
  293                         }
  294                         if (error != 0)
  295                                 break;
  296 
  297                         /* Normalized many link enabled bits */ 
  298                         for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++)
  299                                 conf->enabledLinks[i] = !!conf->enabledLinks[i];
  300 
  301                         /* Copy config and reset */
  302                         bcopy(conf, &priv->conf, sizeof(*conf));
  303                         ng_one2many_update_many(priv);
  304                         break;
  305                     }
  306                 case NGM_ONE2MANY_GET_CONFIG:
  307                     {
  308                         struct ng_one2many_config *conf;
  309 
  310                         NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
  311                         if (resp == NULL) {
  312                                 error = ENOMEM;
  313                                 break;
  314                         }
  315                         conf = (struct ng_one2many_config *)resp->data;
  316                         bcopy(&priv->conf, conf, sizeof(priv->conf));
  317                         break;
  318                     }
  319                 case NGM_ONE2MANY_GET_STATS:
  320                 case NGM_ONE2MANY_CLR_STATS:
  321                 case NGM_ONE2MANY_GETCLR_STATS:
  322                     {
  323                         struct ng_one2many_link *link;
  324                         int linkNum;
  325 
  326                         /* Get link */
  327                         if (msg->header.arglen != sizeof(int32_t)) {
  328                                 error = EINVAL;
  329                                 break;
  330                         }
  331                         linkNum = *((int32_t *)msg->data);
  332                         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  333                                 link = &priv->one;
  334                         else if (linkNum >= 0
  335                             && linkNum < NG_ONE2MANY_MAX_LINKS) {
  336                                 link = &priv->many[linkNum];
  337                         } else {
  338                                 error = EINVAL;
  339                                 break;
  340                         }
  341 
  342                         /* Get/clear stats */
  343                         if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) {
  344                                 NG_MKRESPONSE(resp, msg,
  345                                     sizeof(link->stats), M_NOWAIT);
  346                                 if (resp == NULL) {
  347                                         error = ENOMEM;
  348                                         break;
  349                                 }
  350                                 bcopy(&link->stats,
  351                                     resp->data, sizeof(link->stats));
  352                         }
  353                         if (msg->header.cmd != NGM_ONE2MANY_GET_STATS)
  354                                 bzero(&link->stats, sizeof(link->stats));
  355                         break;
  356                     }
  357                 default:
  358                         error = EINVAL;
  359                         break;
  360                 }
  361                 break;
  362         /*
  363          * One of our downstreams notifies us of link change. If we are
  364          * configured to listen to these message, then we remove/add
  365          * this hook from array of active hooks.
  366          */
  367         case NGM_FLOW_COOKIE:
  368             {
  369                 int linkNum;
  370 
  371                 if (priv->conf.failAlg != NG_ONE2MANY_FAIL_NOTIFY)
  372                         break;
  373 
  374                 if (lasthook == NULL)
  375                         break;
  376 
  377                 linkNum = (intptr_t)NG_HOOK_PRIVATE(lasthook);
  378                 if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  379                         break;
  380 
  381                 KASSERT((linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  382                     ("%s: linkNum=%d", __func__, linkNum));
  383 
  384                 switch (msg->header.cmd) {
  385                 case NGM_LINK_IS_UP:
  386                         priv->conf.enabledLinks[linkNum] = 1;
  387                         ng_one2many_update_many(priv);
  388                         break;
  389                 case NGM_LINK_IS_DOWN:
  390                         priv->conf.enabledLinks[linkNum] = 0;
  391                         ng_one2many_update_many(priv);
  392                         break;
  393                 default:
  394                         break;
  395                 }
  396                 break;
  397             }
  398         default:
  399                 error = EINVAL;
  400                 break;
  401         }
  402 
  403         /* Done */
  404         NG_RESPOND_MSG(error, node, item, resp);
  405         NG_FREE_MSG(msg);
  406         return (error);
  407 }
  408 
  409 /*
  410  * Receive data on a hook
  411  */
  412 static int
  413 ng_one2many_rcvdata(hook_p hook, item_p item)
  414 {
  415         const node_p node = NG_HOOK_NODE(hook);
  416         const priv_p priv = NG_NODE_PRIVATE(node);
  417         struct ng_one2many_link *src;
  418         struct ng_one2many_link *dst = NULL;
  419         int error = 0;
  420         int linkNum;
  421         int i;
  422         struct mbuf *m;
  423 
  424         m = NGI_M(item); /* just peaking, mbuf still owned by item */
  425         /* Get link number */
  426         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  427         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  428             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  429             ("%s: linkNum=%d", __func__, linkNum));
  430 
  431         /* Figure out source link */
  432         src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
  433             &priv->one : &priv->many[linkNum];
  434         KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum));
  435 
  436         /* Update receive stats */
  437         src->stats.recvPackets++;
  438         src->stats.recvOctets += m->m_pkthdr.len;
  439 
  440         /* Figure out destination link */
  441         if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
  442                 if (priv->numActiveMany == 0) {
  443                         NG_FREE_ITEM(item);
  444                         return (ENOTCONN);
  445                 }
  446                 switch(priv->conf.xmitAlg) {
  447                 case NG_ONE2MANY_XMIT_ROUNDROBIN:
  448                         dst = &priv->many[priv->activeMany[priv->nextMany]];
  449                         priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
  450                         break;
  451                 case NG_ONE2MANY_XMIT_ALL:
  452                         /* no need to copy data for the 1st one */
  453                         dst = &priv->many[priv->activeMany[0]];
  454 
  455                         /* make copies of data and send for all links
  456                          * except the first one, which we'll do last 
  457                          */
  458                         for (i = 1; i < priv->numActiveMany; i++) {
  459                                 struct mbuf *m2;
  460                                 struct ng_one2many_link *mdst;
  461 
  462                                 mdst = &priv->many[priv->activeMany[i]];
  463                                 m2 = m_dup(m, M_DONTWAIT);        /* XXX m_copypacket() */
  464                                 if (m2 == NULL) {
  465                                         mdst->stats.memoryFailures++;
  466                                         NG_FREE_ITEM(item);
  467                                         NG_FREE_M(m);
  468                                         return (ENOBUFS);
  469                                 }
  470                                 /* Update transmit stats */
  471                                 mdst->stats.xmitPackets++;
  472                                 mdst->stats.xmitOctets += m->m_pkthdr.len;
  473                                 NG_SEND_DATA_ONLY(error, mdst->hook, m2);
  474                         }
  475                         break;
  476 #ifdef INVARIANTS
  477                 default:
  478                         panic("%s: invalid xmitAlg", __func__);
  479 #endif
  480                 }
  481         } else {
  482                 dst = &priv->one;
  483         }
  484 
  485         /* Update transmit stats */
  486         dst->stats.xmitPackets++;
  487         dst->stats.xmitOctets += m->m_pkthdr.len;
  488 
  489         /* Deliver packet */
  490         NG_FWD_ITEM_HOOK(error, item, dst->hook);
  491         return (error);
  492 }
  493 
  494 /*
  495  * Shutdown node
  496  */
  497 static int
  498 ng_one2many_shutdown(node_p node)
  499 {
  500         const priv_p priv = NG_NODE_PRIVATE(node);
  501 
  502         KASSERT(priv->numActiveMany == 0,
  503             ("%s: numActiveMany=%d", __func__, priv->numActiveMany));
  504         free(priv, M_NETGRAPH);
  505         NG_NODE_SET_PRIVATE(node, NULL);
  506         NG_NODE_UNREF(node);
  507         return (0);
  508 }
  509 
  510 /*
  511  * Hook disconnection.
  512  */
  513 static int
  514 ng_one2many_disconnect(hook_p hook)
  515 {
  516         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  517         int linkNum;
  518 
  519         /* Get link number */
  520         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  521         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  522             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  523             ("%s: linkNum=%d", __func__, linkNum));
  524 
  525         /* Nuke the link */
  526         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  527                 priv->one.hook = NULL;
  528         else {
  529                 priv->many[linkNum].hook = NULL;
  530                 priv->conf.enabledLinks[linkNum] = 0;
  531                 ng_one2many_update_many(priv);
  532         }
  533 
  534         /* If no hooks left, go away */
  535         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  536         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  537                 ng_rmnode_self(NG_HOOK_NODE(hook));
  538         return (0);
  539 }
  540 
  541 /******************************************************************
  542                         OTHER FUNCTIONS
  543 ******************************************************************/
  544 
  545 /*
  546  * Update internal state after the addition or removal of a "many" link
  547  */
  548 static void
  549 ng_one2many_update_many(priv_p priv)
  550 {
  551         uint16_t saveActive = priv->numActiveMany;
  552         int linkNum;
  553 
  554         /* Update list of which "many" links are up */
  555         priv->numActiveMany = 0;
  556         for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
  557                 switch (priv->conf.failAlg) {
  558                 case NG_ONE2MANY_FAIL_MANUAL:
  559                 case NG_ONE2MANY_FAIL_NOTIFY:
  560                         if (priv->many[linkNum].hook != NULL
  561                             && priv->conf.enabledLinks[linkNum]) {
  562                                 priv->activeMany[priv->numActiveMany] = linkNum;
  563                                 priv->numActiveMany++;
  564                         }
  565                         break;
  566 #ifdef INVARIANTS
  567                 default:
  568                         panic("%s: invalid failAlg", __func__);
  569 #endif
  570                 }
  571         }
  572 
  573         if (priv->numActiveMany == 0 && saveActive > 0)
  574                 ng_one2many_notify(priv, NGM_LINK_IS_DOWN);
  575 
  576         if (saveActive == 0 && priv->numActiveMany > 0)
  577                 ng_one2many_notify(priv, NGM_LINK_IS_UP);
  578 
  579         /* Update transmit algorithm state */
  580         switch (priv->conf.xmitAlg) {
  581         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  582                 if (priv->numActiveMany > 0)
  583                         priv->nextMany %= priv->numActiveMany;
  584                 break;
  585         case NG_ONE2MANY_XMIT_ALL:
  586                 break;
  587 #ifdef INVARIANTS
  588         default:
  589                 panic("%s: invalid xmitAlg", __func__);
  590 #endif
  591         }
  592 }
  593 
  594 /*
  595  * Notify upstream if we are out of links, or we have at least one link.
  596  */
  597 static void
  598 ng_one2many_notify(priv_p priv, uint32_t cmd)
  599 {
  600         struct ng_mesg *msg;
  601         int dummy_error = 0;
  602 
  603         if (priv->one.hook == NULL)
  604                 return;
  605 
  606         NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
  607         if (msg != NULL)
  608                 NG_SEND_MSG_HOOK(dummy_error, priv->node, msg, priv->one.hook, 0);
  609 }

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