The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
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: stable/4/sys/netgraph/ng_one2many.c 99312 2002-07-02 23:44:03Z archie $
   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 in round-robin fashion. 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_rmnode;
   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_VERSION,
  166         NG_ONE2MANY_NODE_TYPE,
  167         NULL,
  168         ng_one2many_constructor,
  169         ng_one2many_rcvmsg,
  170         ng_one2many_rmnode,
  171         ng_one2many_newhook,
  172         NULL,
  173         NULL,
  174         ng_one2many_rcvdata,
  175         ng_one2many_rcvdata,
  176         ng_one2many_disconnect,
  177         ng_one2many_cmdlist,
  178 };
  179 NETGRAPH_INIT(one2many, &ng_one2many_typestruct);
  180 
  181 /******************************************************************
  182                     NETGRAPH NODE METHODS
  183 ******************************************************************/
  184 
  185 /*
  186  * Node constructor
  187  */
  188 static int
  189 ng_one2many_constructor(node_p *nodep)
  190 {
  191         priv_p priv;
  192         int error;
  193 
  194         /* Allocate and initialize private info */
  195         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  196         if (priv == NULL)
  197                 return (ENOMEM);
  198         priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN;
  199         priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL;
  200 
  201         /* Call superclass constructor */
  202         if ((error = ng_make_node_common(&ng_one2many_typestruct, nodep))) {
  203                 FREE(priv, M_NETGRAPH);
  204                 return (error);
  205         }
  206         (*nodep)->private = priv;
  207 
  208         /* Done */
  209         return (0);
  210 }
  211 
  212 /*
  213  * Method for attaching a new hook
  214  */
  215 static  int
  216 ng_one2many_newhook(node_p node, hook_p hook, const char *name)
  217 {
  218         const priv_p priv = node->private;
  219         struct ng_one2many_link *link;
  220         int linkNum;
  221         u_long i;
  222 
  223         /* Which hook? */
  224         if (strncmp(name, NG_ONE2MANY_HOOK_MANY_PREFIX,
  225             strlen(NG_ONE2MANY_HOOK_MANY_PREFIX)) == 0) {
  226                 const char *cp;
  227                 char *eptr;
  228 
  229                 cp = name + strlen(NG_ONE2MANY_HOOK_MANY_PREFIX);
  230                 if (!isdigit(*cp) || (cp[0] == '' && cp[1] != '\0'))
  231                         return (EINVAL);
  232                 i = strtoul(cp, &eptr, 10);
  233                 if (*eptr != '\0' || i < 0 || i >= NG_ONE2MANY_MAX_LINKS)
  234                         return (EINVAL);
  235                 linkNum = (int)i;
  236                 link = &priv->many[linkNum];
  237         } else if (strcmp(name, NG_ONE2MANY_HOOK_ONE) == 0) {
  238                 linkNum = NG_ONE2MANY_ONE_LINKNUM;
  239                 link = &priv->one;
  240         } else
  241                 return (EINVAL);
  242 
  243         /* Is hook already connected? (should never happen) */
  244         if (link->hook != NULL)
  245                 return (EISCONN);
  246 
  247         /* Setup private info for this link */
  248         LINK_NUM(hook) = linkNum;
  249         link->hook = hook;
  250         bzero(&link->stats, sizeof(link->stats));
  251         if (linkNum != NG_ONE2MANY_ONE_LINKNUM) {
  252                 priv->conf.enabledLinks[linkNum] = 1;   /* auto-enable link */
  253                 ng_one2many_update_many(priv);
  254         }
  255 
  256         /* Done */
  257         return (0);
  258 }
  259 
  260 /*
  261  * Receive a control message
  262  */
  263 static int
  264 ng_one2many_rcvmsg(node_p node, struct ng_mesg *msg,
  265         const char *retaddr, struct ng_mesg **rptr)
  266 {
  267         const priv_p priv = node->private;
  268         struct ng_mesg *resp = NULL;
  269         int error = 0;
  270 
  271         switch (msg->header.typecookie) {
  272         case NGM_ONE2MANY_COOKIE:
  273                 switch (msg->header.cmd) {
  274                 case NGM_ONE2MANY_SET_CONFIG:
  275                     {
  276                         struct ng_one2many_config *conf;
  277                         int i;
  278 
  279                         /* Check that new configuration is valid */
  280                         if (msg->header.arglen != sizeof(*conf)) {
  281                                 error = EINVAL;
  282                                 break;
  283                         }
  284                         conf = (struct ng_one2many_config *)msg->data;
  285                         switch (conf->xmitAlg) {
  286                         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  287                                 break;
  288                         default:
  289                                 error = EINVAL;
  290                                 break;
  291                         }
  292                         switch (conf->failAlg) {
  293                         case NG_ONE2MANY_FAIL_MANUAL:
  294                                 break;
  295                         default:
  296                                 error = EINVAL;
  297                                 break;
  298                         }
  299                         if (error != 0)
  300                                 break;
  301 
  302                         /* Normalized many link enabled bits */ 
  303                         for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++)
  304                                 conf->enabledLinks[i] = !!conf->enabledLinks[i];
  305 
  306                         /* Copy config and reset */
  307                         bcopy(conf, &priv->conf, sizeof(*conf));
  308                         ng_one2many_update_many(priv);
  309                         break;
  310                     }
  311                 case NGM_ONE2MANY_GET_CONFIG:
  312                     {
  313                         struct ng_one2many_config *conf;
  314 
  315                         NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT);
  316                         if (resp == NULL) {
  317                                 error = ENOMEM;
  318                                 break;
  319                         }
  320                         conf = (struct ng_one2many_config *)resp->data;
  321                         bcopy(&priv->conf, conf, sizeof(priv->conf));
  322                         break;
  323                     }
  324                 case NGM_ONE2MANY_GET_STATS:
  325                 case NGM_ONE2MANY_CLR_STATS:
  326                 case NGM_ONE2MANY_GETCLR_STATS:
  327                     {
  328                         struct ng_one2many_link *link;
  329                         int linkNum;
  330 
  331                         /* Get link */
  332                         if (msg->header.arglen != sizeof(int32_t)) {
  333                                 error = EINVAL;
  334                                 break;
  335                         }
  336                         linkNum = *((int32_t *)msg->data);
  337                         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  338                                 link = &priv->one;
  339                         else if (linkNum == 0
  340                             && linkNum < NG_ONE2MANY_MAX_LINKS) {
  341                                 link = &priv->many[linkNum];
  342                         } else {
  343                                 error = EINVAL;
  344                                 break;
  345                         }
  346 
  347                         /* Get/clear stats */
  348                         if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) {
  349                                 NG_MKRESPONSE(resp, msg,
  350                                     sizeof(link->stats), M_NOWAIT);
  351                                 if (resp == NULL) {
  352                                         error = ENOMEM;
  353                                         break;
  354                                 }
  355                                 bcopy(&link->stats,
  356                                     resp->data, sizeof(link->stats));
  357                         }
  358                         if (msg->header.cmd != NGM_ONE2MANY_GET_STATS)
  359                                 bzero(&link->stats, sizeof(link->stats));
  360                         break;
  361                     }
  362                 default:
  363                         error = EINVAL;
  364                         break;
  365                 }
  366                 break;
  367         default:
  368                 error = EINVAL;
  369                 break;
  370         }
  371 
  372         /* Done */
  373         if (rptr)
  374                 *rptr = resp;
  375         else if (resp != NULL)
  376                 FREE(resp, M_NETGRAPH);
  377         FREE(msg, M_NETGRAPH);
  378         return (error);
  379 }
  380 
  381 /*
  382  * Receive data on a hook
  383  */
  384 static int
  385 ng_one2many_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  386 {
  387         const node_p node = hook->node;
  388         const priv_p priv = node->private;
  389         struct ng_one2many_link *src;
  390         struct ng_one2many_link *dst;
  391         int error = 0;
  392         int linkNum;
  393 
  394         /* Get link number */
  395         linkNum = LINK_NUM(hook);
  396         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  397             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  398             ("%s: linkNum=%d", __FUNCTION__, linkNum));
  399 
  400         /* Figure out source link */
  401         src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ?
  402             &priv->one : &priv->many[linkNum];
  403         KASSERT(src->hook != NULL, ("%s: no src%d", __FUNCTION__, linkNum));
  404 
  405         /* Update receive stats */
  406         src->stats.recvPackets++;
  407         src->stats.recvOctets += m->m_pkthdr.len;
  408 
  409         /* Figure out destination link */
  410         if (linkNum == NG_ONE2MANY_ONE_LINKNUM) {
  411                 if (priv->numActiveMany == 0) {
  412                         NG_FREE_DATA(m, meta);
  413                         return (ENOTCONN);
  414                 }
  415                 dst = &priv->many[priv->activeMany[priv->nextMany]];
  416                 priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany;
  417         } else
  418                 dst = &priv->one;
  419 
  420         /* Update transmit stats */
  421         dst->stats.xmitPackets++;
  422         dst->stats.xmitOctets += m->m_pkthdr.len;
  423 
  424         /* Deliver packet */
  425         NG_SEND_DATA(error, dst->hook, m, meta);
  426         return (error);
  427 }
  428 
  429 /*
  430  * Shutdown node
  431  */
  432 static int
  433 ng_one2many_rmnode(node_p node)
  434 {
  435         const priv_p priv = node->private;
  436 
  437         ng_unname(node);
  438         ng_cutlinks(node);
  439         KASSERT(priv->numActiveMany == 0,
  440             ("%s: numActiveMany=%d", __FUNCTION__, priv->numActiveMany));
  441         FREE(priv, M_NETGRAPH);
  442         node->private = NULL;
  443         ng_unref(node);
  444         return (0);
  445 }
  446 
  447 /*
  448  * Hook disconnection.
  449  */
  450 static int
  451 ng_one2many_disconnect(hook_p hook)
  452 {
  453         const priv_p priv = hook->node->private;
  454         int linkNum;
  455 
  456         /* Get link number */
  457         linkNum = LINK_NUM(hook);
  458         KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM
  459             || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS),
  460             ("%s: linkNum=%d", __FUNCTION__, linkNum));
  461 
  462         /* Nuke the link */
  463         if (linkNum == NG_ONE2MANY_ONE_LINKNUM)
  464                 priv->one.hook = NULL;
  465         else {
  466                 priv->many[linkNum].hook = NULL;
  467                 priv->conf.enabledLinks[linkNum] = 0;
  468                 ng_one2many_update_many(priv);
  469         }
  470 
  471         /* If no hooks left, go away */
  472         if (hook->node->numhooks == 0)
  473                 ng_rmnode(hook->node);
  474         return (0);
  475 }
  476 
  477 /******************************************************************
  478                         OTHER FUNCTIONS
  479 ******************************************************************/
  480 
  481 /*
  482  * Update internal state after the addition or removal of a "many" link
  483  */
  484 static void
  485 ng_one2many_update_many(priv_p priv)
  486 {
  487         int linkNum;
  488 
  489         /* Update list of which "many" links are up */
  490         priv->numActiveMany = 0;
  491         for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) {
  492                 switch (priv->conf.failAlg) {
  493                 case NG_ONE2MANY_FAIL_MANUAL:
  494                         if (priv->many[linkNum].hook != NULL
  495                             && priv->conf.enabledLinks[linkNum]) {
  496                                 priv->activeMany[priv->numActiveMany] = linkNum;
  497                                 priv->numActiveMany++;
  498                         }
  499                         break;
  500 #ifdef INVARIANTS
  501                 default:
  502                         panic("%s: invalid failAlg", __FUNCTION__);
  503 #endif
  504                 }
  505         }
  506 
  507         /* Update transmit algorithm state */
  508         switch (priv->conf.xmitAlg) {
  509         case NG_ONE2MANY_XMIT_ROUNDROBIN:
  510                 if (priv->numActiveMany > 0)
  511                         priv->nextMany %= priv->numActiveMany;
  512                 break;
  513 #ifdef INVARIANTS
  514         default:
  515                 panic("%s: invalid xmitAlg", __FUNCTION__);
  516 #endif
  517         }
  518 }
  519 
  520 

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