ng_one2many.c

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    1 
    2 /*
    3  * ng_one2many.c
    4  *
    5  * Copyright (c) 2000 Whistle Communications, Inc.
    6  * All rights reserved.
    7  * 
    8  * Subject to the following obligations and disclaimer of warranty, use and
    9  * redistribution of this software, in source or object code forms, with or
   10  * without modifications are expressly permitted by Whistle Communications;
   11  * provided, however, that:
   12  * 1. Any and all reproductions of the source or object code must include the
   13  *    copyright notice above and the following disclaimer of warranties; and
   14  * 2. No rights are granted, in any manner or form, to use Whistle
   15  *    Communications, Inc. trademarks, including the mark "WHISTLE
   16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   17  *    such appears in the above copyright notice or in the software.
   18  * 
   19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   35  * OF SUCH DAMAGE.
   36  *
   37  * Author: Archie Cobbs <archie@freebsd.org>
   38  *
   39  * $FreeBSD: releng/5.3/sys/netgraph/ng_one2many.c 136588 2004-10-16 08:43:07Z cvs2svn $
   40  */
   41 
   42 /*
   43  * ng_one2many(4) netgraph node type
   44  *
   45  * Packets received on the "one" hook are sent out each of the
   46  * "many" hooks accoring to an algorithm. Packets received on any
   47  * "many" hook are always delivered to the "one" hook.
   48  */
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/kernel.h>
   53 #include <sys/malloc.h>
   54 #include <sys/ctype.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/errno.h>
   57 
   58 #include <netgraph/ng_message.h>
   59 #include <netgraph/netgraph.h>
   60 #include <netgraph/ng_parse.h>
   61 #include <netgraph/ng_one2many.h>
   62 
   63 /* Per-link private data */
   64 struct ng_one2many_link {
   65         hook_p                          hook;   /* netgraph hook */
   66         struct ng_one2many_link_stats   stats;  /* link stats */
   67 };
   68 
   69 /* Per-node private data */
   70 struct ng_one2many_private {
   71         struct ng_one2many_config       conf;           /* node configuration */
   72         struct ng_one2many_link         one;            /* "one" hook */
   73         struct ng_one2many_link         many[NG_ONE2MANY_MAX_LINKS];
   74         u_int16_t                       nextMany;       /* next round-robin */
   75         u_int16_t                       numActiveMany;  /* # active "many" */
   76         u_int16_t                       activeMany[NG_ONE2MANY_MAX_LINKS];
   77 };
   78 typedef struct ng_one2many_private *priv_p;
   79 
   80 /* Netgraph node methods */
   81 static ng_constructor_t ng_one2many_constructor;
   82 static ng_rcvmsg_t      ng_one2many_rcvmsg;
   83 static ng_shutdown_t    ng_one2many_shutdown;
   84 static ng_newhook_t     ng_one2many_newhook;
   85 static ng_rcvdata_t     ng_one2many_rcvdata;
   86 static ng_disconnect_t  ng_one2many_disconnect;
   87 
   88 /* Other functions */
   89 static void             ng_one2many_update_many(priv_p priv);
   90 
   91 /* Store each hook's link number in the private field */
   92 #define LINK_NUM(hook)          (*(int16_t *)(&(hook)->private))
   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         MALLOC(priv, priv_p, 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         NG_NODE_SET_PRIVATE(node, priv);
  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 < 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                                 break;
  280                         default:
  281                                 error = EINVAL;
  282                                 break;
  283                         }
  284                         switch (conf->failAlg) {
  285                         case NG_ONE2MANY_FAIL_MANUAL:
  286                                 break;
  287                         default:
  288                                 error = EINVAL;
  289                                 break;
  290                         }
  291                         if (error != 0)
  292                                 break;
  293 
  294                         /* Normalized many link enabled bits */ 
  295                         for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++)
  296                                 conf->enabledLinks[i] = !!conf->enabledLinks[i];
  297 
  298                         /* Copy config and reset */
  299                         bcopy(conf, &priv->conf, sizeof(*conf));
  300                         ng_one2many_update_many(priv);
  301                         break;
  302                     }
  303                 case NGM_ONE2MANY_GET_CONFIG:
  304                     {
  305                         struct ng_one2many_config *conf;
  306 
  307                         NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
  308                         if (resp == NULL) {
  309                                 error = ENOMEM;
  310                                 break;
  311                         }
  312                         conf = (struct ng_one2many_config *)resp->data;
  313                         bcopy(&priv->conf, conf, sizeof(priv->conf));
  314                         break;
  315                     }
  316                 case NGM_ONE2MANY_GET_STATS:
  317                 case NGM_ONE2MANY_CLR_STATS:
  318                 case NGM_ONE2MANY_GETCLR_STATS:
  319                     {
  320                         struct ng_one2many_link *link;
  321                         int linkNum;
  322 
  323                         /* Get link */
  324                         if (msg->header.arglen != sizeof(int32_t)) {
  325                                 error = EINVAL;
  326                                 break;
  327                         }
  328                         linkNum = *((int32_t *)msg->data);
  329                         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  330                                 link = &priv->one;
  331                         else if (linkNum == 0
  332                             && linkNum < NG_ONE2MANY_MAX_LINKS) {
  333                                 link = &priv->many[linkNum];
  334                         } else {
  335                                 error = EINVAL;
  336                                 break;
  337                         }
  338 
  339                         /* Get/clear stats */
  340                         if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) {
  341                                 NG_MKRESPONSE(resp, msg,
  342                                     sizeof(link->stats), M_NOWAIT);
  343                                 if (resp == NULL) {
  344                                         error = ENOMEM;
  345                                         break;
  346                                 }
  347                                 bcopy(&link->stats,
  348                                     resp->data, sizeof(link->stats));
  349                         }
  350                         if (msg->header.cmd != NGM_ONE2MANY_GET_STATS)
  351                                 bzero(&link->stats, sizeof(link->stats));
  352                         break;
  353                     }
  354                 default:
  355                         error = EINVAL;
  356                         break;
  357                 }
  358                 break;
  359         default:
  360                 error = EINVAL;
  361                 break;
  362         }
  363 
  364         /* Done */
  365         NG_RESPOND_MSG(error, node, item, resp);
  366         NG_FREE_MSG(msg);
  367         return (error);
  368 }
  369 
  370 /*
  371  * Receive data on a hook
  372  */
  373 static int
  374 ng_one2many_rcvdata(hook_p hook, item_p item)
  375 {
  376         const node_p node = NG_HOOK_NODE(hook);
  377         const priv_p priv = NG_NODE_PRIVATE(node);
  378         struct ng_one2many_link *src;
  379         struct ng_one2many_link *dst = NULL;
  380         int error = 0;
  381         int linkNum;
  382         int i;
  383         struct mbuf *m;
  384 
  385         m = NGI_M(item); /* just peaking, mbuf still owned by item */
  386         /* Get link number */
  387         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  388         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  389             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  390             ("%s: linkNum=%d", __func__, linkNum));
  391 
  392         /* Figure out source link */
  393         src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
  394             &priv->one : &priv->many[linkNum];
  395         KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum));
  396 
  397         /* Update receive stats */
  398         src->stats.recvPackets++;
  399         src->stats.recvOctets += m->m_pkthdr.len;
  400 
  401         /* Figure out destination link */
  402         if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
  403                 if (priv->numActiveMany == 0) {
  404                         NG_FREE_ITEM(item);
  405                         return (ENOTCONN);
  406                 }
  407                 switch(priv->conf.xmitAlg) {
  408                 case NG_ONE2MANY_XMIT_ROUNDROBIN:
  409                         dst = &priv->many[priv->activeMany[priv->nextMany]];
  410                         priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
  411                         break;
  412                 case NG_ONE2MANY_XMIT_ALL:
  413                         /* no need to copy data for the 1st one */
  414                         dst = &priv->many[priv->activeMany[0]];
  415 
  416                         /* make copies of data and send for all links
  417                          * except the first one, which we'll do last 
  418                          */
  419                         for (i = 1; i < priv->numActiveMany; i++) {
  420                                 struct mbuf *m2;
  421                                 struct ng_one2many_link *mdst;
  422 
  423                                 mdst = &priv->many[priv->activeMany[i]];
  424                                 m2 = m_dup(m, M_DONTWAIT);        /* XXX m_copypacket() */
  425                                 if (m2 == NULL) {
  426                                         mdst->stats.memoryFailures++;
  427                                         NG_FREE_ITEM(item);
  428                                         NG_FREE_M(m);
  429                                         return (ENOBUFS);
  430                                 }
  431                                 /* Update transmit stats */
  432                                 mdst->stats.xmitPackets++;
  433                                 mdst->stats.xmitOctets += m->m_pkthdr.len;
  434                                 NG_SEND_DATA_ONLY(error, mdst->hook, m2);
  435                         }
  436                         break;
  437 #ifdef INVARIANTS
  438                 default:
  439                         panic("%s: invalid xmitAlg", __func__);
  440 #endif
  441                 }
  442         } else {
  443                 dst = &priv->one;
  444         }
  445 
  446         /* Update transmit stats */
  447         dst->stats.xmitPackets++;
  448         dst->stats.xmitOctets += m->m_pkthdr.len;
  449 
  450         /* Deliver packet */
  451         NG_FWD_ITEM_HOOK(error, item, dst->hook);
  452         return (error);
  453 }
  454 
  455 /*
  456  * Shutdown node
  457  */
  458 static int
  459 ng_one2many_shutdown(node_p node)
  460 {
  461         const priv_p priv = NG_NODE_PRIVATE(node);
  462 
  463         KASSERT(priv->numActiveMany == 0,
  464             ("%s: numActiveMany=%d", __func__, priv->numActiveMany));
  465         FREE(priv, M_NETGRAPH);
  466         NG_NODE_SET_PRIVATE(node, NULL);
  467         NG_NODE_UNREF(node);
  468         return (0);
  469 }
  470 
  471 /*
  472  * Hook disconnection.
  473  */
  474 static int
  475 ng_one2many_disconnect(hook_p hook)
  476 {
  477         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  478         int linkNum;
  479 
  480         /* Get link number */
  481         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  482         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  483             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  484             ("%s: linkNum=%d", __func__, linkNum));
  485 
  486         /* Nuke the link */
  487         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  488                 priv->one.hook = NULL;
  489         else {
  490                 priv->many[linkNum].hook = NULL;
  491                 priv->conf.enabledLinks[linkNum] = 0;
  492                 ng_one2many_update_many(priv);
  493         }
  494 
  495         /* If no hooks left, go away */
  496         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  497         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  498                 ng_rmnode_self(NG_HOOK_NODE(hook));
  499         return (0);
  500 }
  501 
  502 /******************************************************************
  503                         OTHER FUNCTIONS
  504 ******************************************************************/
  505 
  506 /*
  507  * Update internal state after the addition or removal of a "many" link
  508  */
  509 static void
  510 ng_one2many_update_many(priv_p priv)
  511 {
  512         int linkNum;
  513 
  514         /* Update list of which "many" links are up */
  515         priv->numActiveMany = 0;
  516         for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
  517                 switch (priv->conf.failAlg) {
  518                 case NG_ONE2MANY_FAIL_MANUAL:
  519                         if (priv->many[linkNum].hook != NULL
  520                             && priv->conf.enabledLinks[linkNum]) {
  521                                 priv->activeMany[priv->numActiveMany] = linkNum;
  522                                 priv->numActiveMany++;
  523                         }
  524                         break;
  525 #ifdef INVARIANTS
  526                 default:
  527                         panic("%s: invalid failAlg", __func__);
  528 #endif
  529                 }
  530         }
  531 
  532         /* Update transmit algorithm state */
  533         switch (priv->conf.xmitAlg) {
  534         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  535                 if (priv->numActiveMany > 0)
  536                         priv->nextMany %= priv->numActiveMany;
  537                 break;
  538         case NG_ONE2MANY_XMIT_ALL:
  539                 break;
  540 #ifdef INVARIANTS
  541         default:
  542                 panic("%s: invalid xmitAlg", __func__);
  543 #endif
  544         }
  545 }
  546 
  547
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FreeBSD/Linux Kernel Cross Reference sys/netgraph/ng_one2many.c

FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_one2many.c
