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 /*
    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/5.0/sys/netgraph/ng_one2many.c 106665 2002-11-08 21:13:18Z jhb $
   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         NG_ABI_VERSION,
  166         NG_ONE2MANY_NODE_TYPE,
  167         NULL,
  168         ng_one2many_constructor,
  169         ng_one2many_rcvmsg,
  170         ng_one2many_shutdown,
  171         ng_one2many_newhook,
  172         NULL,
  173         NULL,
  174         ng_one2many_rcvdata,
  175         ng_one2many_disconnect,
  176         ng_one2many_cmdlist,
  177 };
  178 NETGRAPH_INIT(one2many, &ng_one2many_typestruct);
  179 
  180 /******************************************************************
  181                     NETGRAPH NODE METHODS
  182 ******************************************************************/
  183 
  184 /*
  185  * Node constructor
  186  */
  187 static int
  188 ng_one2many_constructor(node_p node)
  189 {
  190         priv_p priv;
  191 
  192         /* Allocate and initialize private info */
  193         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  194         if (priv == NULL)
  195                 return (ENOMEM);
  196         priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN;
  197         priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL;
  198 
  199         NG_NODE_SET_PRIVATE(node, priv);
  200 
  201         /* Done */
  202         return (0);
  203 }
  204 
  205 /*
  206  * Method for attaching a new hook
  207  */
  208 static  int
  209 ng_one2many_newhook(node_p node, hook_p hook, const char *name)
  210 {
  211         const priv_p priv = NG_NODE_PRIVATE(node);
  212         struct ng_one2many_link *link;
  213         int linkNum;
  214         u_long i;
  215 
  216         /* Which hook? */
  217         if (strncmp(name, NG_ONE2MANY_HOOK_MANY_PREFIX,
  218             strlen(NG_ONE2MANY_HOOK_MANY_PREFIX)) == 0) {
  219                 const char *cp;
  220                 char *eptr;
  221 
  222                 cp = name + strlen(NG_ONE2MANY_HOOK_MANY_PREFIX);
  223                 if (!isdigit(*cp) || (cp[0] == '' && cp[1] != '\0'))
  224                         return (EINVAL);
  225                 i = strtoul(cp, &eptr, 10);
  226                 if (*eptr != '\0' || i < 0 || i >= NG_ONE2MANY_MAX_LINKS)
  227                         return (EINVAL);
  228                 linkNum = (int)i;
  229                 link = &priv->many[linkNum];
  230         } else if (strcmp(name, NG_ONE2MANY_HOOK_ONE) == 0) {
  231                 linkNum = NG_ONE2MANY_ONE_LINKNUM;
  232                 link = &priv->one;
  233         } else
  234                 return (EINVAL);
  235 
  236         /* Is hook already connected? (should never happen) */
  237         if (link->hook != NULL)
  238                 return (EISCONN);
  239 
  240         /* Setup private info for this link */
  241         NG_HOOK_SET_PRIVATE(hook, (void *)(intptr_t)linkNum);
  242         link->hook = hook;
  243         bzero(&link->stats, sizeof(link->stats));
  244         if (linkNum != NG_ONE2MANY_ONE_LINKNUM) {
  245                 priv->conf.enabledLinks[linkNum] = 1;   /* auto-enable link */
  246                 ng_one2many_update_many(priv);
  247         }
  248 
  249         /* Done */
  250         return (0);
  251 }
  252 
  253 /*
  254  * Receive a control message
  255  */
  256 static int
  257 ng_one2many_rcvmsg(node_p node, item_p item, hook_p lasthook)
  258 {
  259         const priv_p priv = NG_NODE_PRIVATE(node);
  260         struct ng_mesg *resp = NULL;
  261         int error = 0;
  262         struct ng_mesg *msg;
  263 
  264         NGI_GET_MSG(item, msg);
  265         switch (msg->header.typecookie) {
  266         case NGM_ONE2MANY_COOKIE:
  267                 switch (msg->header.cmd) {
  268                 case NGM_ONE2MANY_SET_CONFIG:
  269                     {
  270                         struct ng_one2many_config *conf;
  271                         int i;
  272 
  273                         /* Check that new configuration is valid */
  274                         if (msg->header.arglen != sizeof(*conf)) {
  275                                 error = EINVAL;
  276                                 break;
  277                         }
  278                         conf = (struct ng_one2many_config *)msg->data;
  279                         switch (conf->xmitAlg) {
  280                         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  281                         case NG_ONE2MANY_XMIT_ALL:
  282                                 break;
  283                         default:
  284                                 error = EINVAL;
  285                                 break;
  286                         }
  287                         switch (conf->failAlg) {
  288                         case NG_ONE2MANY_FAIL_MANUAL:
  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         default:
  363                 error = EINVAL;
  364                 break;
  365         }
  366 
  367         /* Done */
  368         NG_RESPOND_MSG(error, node, item, resp);
  369         NG_FREE_MSG(msg);
  370         return (error);
  371 }
  372 
  373 /*
  374  * Receive data on a hook
  375  */
  376 static int
  377 ng_one2many_rcvdata(hook_p hook, item_p item)
  378 {
  379         const node_p node = NG_HOOK_NODE(hook);
  380         const priv_p priv = NG_NODE_PRIVATE(node);
  381         struct ng_one2many_link *src;
  382         struct ng_one2many_link *dst = NULL;
  383         int error = 0;
  384         int linkNum;
  385         int i;
  386         struct mbuf *m;
  387         meta_p meta;
  388 
  389         m = NGI_M(item); /* just peaking, mbuf still owned by item */
  390         /* Get link number */
  391         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  392         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  393             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  394             ("%s: linkNum=%d", __func__, linkNum));
  395 
  396         /* Figure out source link */
  397         src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
  398             &priv->one : &priv->many[linkNum];
  399         KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum));
  400 
  401         /* Update receive stats */
  402         src->stats.recvPackets++;
  403         src->stats.recvOctets += m->m_pkthdr.len;
  404 
  405         /* Figure out destination link */
  406         if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
  407                 if (priv->numActiveMany == 0) {
  408                         NG_FREE_ITEM(item);
  409                         return (ENOTCONN);
  410                 }
  411                 switch(priv->conf.xmitAlg) {
  412                 case NG_ONE2MANY_XMIT_ROUNDROBIN:
  413                         dst = &priv->many[priv->activeMany[priv->nextMany]];
  414                         priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
  415                         break;
  416                 case NG_ONE2MANY_XMIT_ALL:
  417                         meta = NGI_META(item); /* peek.. */
  418                         /* no need to copy data for the 1st one */
  419                         dst = &priv->many[priv->activeMany[0]];
  420 
  421                         /* make copies of data and send for all links
  422                          * except the first one, which we'll do last 
  423                          */
  424                         for (i = 1; i < priv->numActiveMany; i++) {
  425                                 meta_p meta2 = NULL;
  426                                 struct mbuf *m2;
  427                                 struct ng_one2many_link *mdst;
  428 
  429                                 mdst = &priv->many[priv->activeMany[i]];
  430                                 m2 = m_dup(m, M_NOWAIT);        /* XXX m_copypacket() */
  431                                 if (m2 == NULL) {
  432                                         mdst->stats.memoryFailures++;
  433                                         NG_FREE_ITEM(item);
  434                                         NG_FREE_M(m);
  435                                         return (ENOBUFS);
  436                                 }
  437                                 if (meta != NULL
  438                                     && (meta2 = ng_copy_meta(meta)) == NULL) {
  439                                         mdst->stats.memoryFailures++;
  440                                         m_freem(m2);
  441                                         NG_FREE_ITEM(item);
  442                                         NG_FREE_M(m);
  443                                         return (ENOMEM);
  444                                 }
  445                                 /* Update transmit stats */
  446                                 mdst->stats.xmitPackets++;
  447                                 mdst->stats.xmitOctets += m->m_pkthdr.len;
  448                                 NG_SEND_DATA(error, mdst->hook, m2, meta2);
  449                         }
  450                         break;
  451 #ifdef INVARIANTS
  452                 default:
  453                         panic("%s: invalid xmitAlg", __func__);
  454 #endif
  455                 }
  456         } else {
  457                 dst = &priv->one;
  458         }
  459 
  460         /* Update transmit stats */
  461         dst->stats.xmitPackets++;
  462         dst->stats.xmitOctets += m->m_pkthdr.len;
  463 
  464         /* Deliver packet */
  465         NG_FWD_ITEM_HOOK(error, item, dst->hook);
  466         return (error);
  467 }
  468 
  469 /*
  470  * Shutdown node
  471  */
  472 static int
  473 ng_one2many_shutdown(node_p node)
  474 {
  475         const priv_p priv = NG_NODE_PRIVATE(node);
  476 
  477         KASSERT(priv->numActiveMany == 0,
  478             ("%s: numActiveMany=%d", __func__, priv->numActiveMany));
  479         FREE(priv, M_NETGRAPH);
  480         NG_NODE_SET_PRIVATE(node, NULL);
  481         NG_NODE_UNREF(node);
  482         return (0);
  483 }
  484 
  485 /*
  486  * Hook disconnection.
  487  */
  488 static int
  489 ng_one2many_disconnect(hook_p hook)
  490 {
  491         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  492         int linkNum;
  493 
  494         /* Get link number */
  495         linkNum = (intptr_t)NG_HOOK_PRIVATE(hook);
  496         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  497             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  498             ("%s: linkNum=%d", __func__, linkNum));
  499 
  500         /* Nuke the link */
  501         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  502                 priv->one.hook = NULL;
  503         else {
  504                 priv->many[linkNum].hook = NULL;
  505                 priv->conf.enabledLinks[linkNum] = 0;
  506                 ng_one2many_update_many(priv);
  507         }
  508 
  509         /* If no hooks left, go away */
  510         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  511         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
  512                 ng_rmnode_self(NG_HOOK_NODE(hook));
  513         return (0);
  514 }
  515 
  516 /******************************************************************
  517                         OTHER FUNCTIONS
  518 ******************************************************************/
  519 
  520 /*
  521  * Update internal state after the addition or removal of a "many" link
  522  */
  523 static void
  524 ng_one2many_update_many(priv_p priv)
  525 {
  526         int linkNum;
  527 
  528         /* Update list of which "many" links are up */
  529         priv->numActiveMany = 0;
  530         for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
  531                 switch (priv->conf.failAlg) {
  532                 case NG_ONE2MANY_FAIL_MANUAL:
  533                         if (priv->many[linkNum].hook != NULL
  534                             && priv->conf.enabledLinks[linkNum]) {
  535                                 priv->activeMany[priv->numActiveMany] = linkNum;
  536                                 priv->numActiveMany++;
  537                         }
  538                         break;
  539 #ifdef INVARIANTS
  540                 default:
  541                         panic("%s: invalid failAlg", __func__);
  542 #endif
  543                 }
  544         }
  545 
  546         /* Update transmit algorithm state */
  547         switch (priv->conf.xmitAlg) {
  548         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  549                 if (priv->numActiveMany > 0)
  550                         priv->nextMany %= priv->numActiveMany;
  551                 break;
  552         case NG_ONE2MANY_XMIT_ALL:
  553                 break;
  554 #ifdef INVARIANTS
  555         default:
  556                 panic("%s: invalid xmitAlg", __func__);
  557 #endif
  558         }
  559 }
  560 
  561 

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