sys/netgraph/one2many/ng_one2many.c

   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: src/sys/netgraph/ng_one2many.c,v 1.1.2.2 2002/07/02 23:44:02 archie Exp $
  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 "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         priv = kmalloc(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                 kfree(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] == '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                 kfree(resp, M_NETGRAPH);
 377         kfree(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", __func__, 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", __func__, 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", __func__, priv->numActiveMany));
 441         kfree(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", __func__, 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", __func__);
 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", __func__);
 516 #endif
 517         }
 518 }
 519
 520