Now available: 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/8.4/sys/netgraph/ng_one2many.c 219660 2011-03-15 07:15:04Z ae $ 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 case NG_ONE2MANY_XMIT_FAILOVER: 282 break; 283 default: 284 error = EINVAL; 285 break; 286 } 287 switch (conf->failAlg) { 288 case NG_ONE2MANY_FAIL_MANUAL: 289 case NG_ONE2MANY_FAIL_NOTIFY: 290 break; 291 default: 292 error = EINVAL; 293 break; 294 } 295 if (error != 0) 296 break; 297 298 /* Normalized many link enabled bits */ 299 for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++) 300 conf->enabledLinks[i] = !!conf->enabledLinks[i]; 301 302 /* Copy config and reset */ 303 bcopy(conf, &priv->conf, sizeof(*conf)); 304 ng_one2many_update_many(priv); 305 break; 306 } 307 case NGM_ONE2MANY_GET_CONFIG: 308 { 309 struct ng_one2many_config *conf; 310 311 NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT); 312 if (resp == NULL) { 313 error = ENOMEM; 314 break; 315 } 316 conf = (struct ng_one2many_config *)resp->data; 317 bcopy(&priv->conf, conf, sizeof(priv->conf)); 318 break; 319 } 320 case NGM_ONE2MANY_GET_STATS: 321 case NGM_ONE2MANY_CLR_STATS: 322 case NGM_ONE2MANY_GETCLR_STATS: 323 { 324 struct ng_one2many_link *link; 325 int linkNum; 326 327 /* Get link */ 328 if (msg->header.arglen != sizeof(int32_t)) { 329 error = EINVAL; 330 break; 331 } 332 linkNum = *((int32_t *)msg->data); 333 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) 334 link = &priv->one; 335 else if (linkNum >= 0 336 && linkNum < NG_ONE2MANY_MAX_LINKS) { 337 link = &priv->many[linkNum]; 338 } else { 339 error = EINVAL; 340 break; 341 } 342 343 /* Get/clear stats */ 344 if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) { 345 NG_MKRESPONSE(resp, msg, 346 sizeof(link->stats), M_NOWAIT); 347 if (resp == NULL) { 348 error = ENOMEM; 349 break; 350 } 351 bcopy(&link->stats, 352 resp->data, sizeof(link->stats)); 353 } 354 if (msg->header.cmd != NGM_ONE2MANY_GET_STATS) 355 bzero(&link->stats, sizeof(link->stats)); 356 break; 357 } 358 default: 359 error = EINVAL; 360 break; 361 } 362 break; 363 /* 364 * One of our downstreams notifies us of link change. If we are 365 * configured to listen to these message, then we remove/add 366 * this hook from array of active hooks. 367 */ 368 case NGM_FLOW_COOKIE: 369 { 370 int linkNum; 371 372 if (priv->conf.failAlg != NG_ONE2MANY_FAIL_NOTIFY) 373 break; 374 375 if (lasthook == NULL) 376 break; 377 378 linkNum = (intptr_t)NG_HOOK_PRIVATE(lasthook); 379 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) 380 break; 381 382 KASSERT((linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS), 383 ("%s: linkNum=%d", __func__, linkNum)); 384 385 switch (msg->header.cmd) { 386 case NGM_LINK_IS_UP: 387 priv->conf.enabledLinks[linkNum] = 1; 388 ng_one2many_update_many(priv); 389 break; 390 case NGM_LINK_IS_DOWN: 391 priv->conf.enabledLinks[linkNum] = 0; 392 ng_one2many_update_many(priv); 393 break; 394 default: 395 break; 396 } 397 break; 398 } 399 default: 400 error = EINVAL; 401 break; 402 } 403 404 /* Done */ 405 NG_RESPOND_MSG(error, node, item, resp); 406 NG_FREE_MSG(msg); 407 return (error); 408 } 409 410 /* 411 * Receive data on a hook 412 */ 413 static int 414 ng_one2many_rcvdata(hook_p hook, item_p item) 415 { 416 const node_p node = NG_HOOK_NODE(hook); 417 const priv_p priv = NG_NODE_PRIVATE(node); 418 struct ng_one2many_link *src; 419 struct ng_one2many_link *dst = NULL; 420 int error = 0; 421 int linkNum; 422 int i; 423 struct mbuf *m; 424 425 m = NGI_M(item); /* just peaking, mbuf still owned by item */ 426 /* Get link number */ 427 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook); 428 KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM 429 || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS), 430 ("%s: linkNum=%d", __func__, linkNum)); 431 432 /* Figure out source link */ 433 src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ? 434 &priv->one : &priv->many[linkNum]; 435 KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum)); 436 437 /* Update receive stats */ 438 src->stats.recvPackets++; 439 src->stats.recvOctets += m->m_pkthdr.len; 440 441 /* Figure out destination link */ 442 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) { 443 if (priv->numActiveMany == 0) { 444 NG_FREE_ITEM(item); 445 return (ENOTCONN); 446 } 447 switch(priv->conf.xmitAlg) { 448 case NG_ONE2MANY_XMIT_ROUNDROBIN: 449 dst = &priv->many[priv->activeMany[priv->nextMany]]; 450 priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany; 451 break; 452 case NG_ONE2MANY_XMIT_ALL: 453 /* no need to copy data for the 1st one */ 454 dst = &priv->many[priv->activeMany[0]]; 455 456 /* make copies of data and send for all links 457 * except the first one, which we'll do last 458 */ 459 for (i = 1; i < priv->numActiveMany; i++) { 460 struct mbuf *m2; 461 struct ng_one2many_link *mdst; 462 463 mdst = &priv->many[priv->activeMany[i]]; 464 m2 = m_dup(m, M_DONTWAIT); /* XXX m_copypacket() */ 465 if (m2 == NULL) { 466 mdst->stats.memoryFailures++; 467 NG_FREE_ITEM(item); 468 NG_FREE_M(m); 469 return (ENOBUFS); 470 } 471 /* Update transmit stats */ 472 mdst->stats.xmitPackets++; 473 mdst->stats.xmitOctets += m->m_pkthdr.len; 474 NG_SEND_DATA_ONLY(error, mdst->hook, m2); 475 } 476 break; 477 case NG_ONE2MANY_XMIT_FAILOVER: 478 dst = &priv->many[priv->activeMany[0]]; 479 break; 480 #ifdef INVARIANTS 481 default: 482 panic("%s: invalid xmitAlg", __func__); 483 #endif 484 } 485 } else { 486 dst = &priv->one; 487 } 488 489 /* Update transmit stats */ 490 dst->stats.xmitPackets++; 491 dst->stats.xmitOctets += m->m_pkthdr.len; 492 493 /* Deliver packet */ 494 NG_FWD_ITEM_HOOK(error, item, dst->hook); 495 return (error); 496 } 497 498 /* 499 * Shutdown node 500 */ 501 static int 502 ng_one2many_shutdown(node_p node) 503 { 504 const priv_p priv = NG_NODE_PRIVATE(node); 505 506 KASSERT(priv->numActiveMany == 0, 507 ("%s: numActiveMany=%d", __func__, priv->numActiveMany)); 508 free(priv, M_NETGRAPH); 509 NG_NODE_SET_PRIVATE(node, NULL); 510 NG_NODE_UNREF(node); 511 return (0); 512 } 513 514 /* 515 * Hook disconnection. 516 */ 517 static int 518 ng_one2many_disconnect(hook_p hook) 519 { 520 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 521 int linkNum; 522 523 /* Get link number */ 524 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook); 525 KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM 526 || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS), 527 ("%s: linkNum=%d", __func__, linkNum)); 528 529 /* Nuke the link */ 530 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) 531 priv->one.hook = NULL; 532 else { 533 priv->many[linkNum].hook = NULL; 534 priv->conf.enabledLinks[linkNum] = 0; 535 ng_one2many_update_many(priv); 536 } 537 538 /* If no hooks left, go away */ 539 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 540 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 541 ng_rmnode_self(NG_HOOK_NODE(hook)); 542 return (0); 543 } 544 545 /****************************************************************** 546 OTHER FUNCTIONS 547 ******************************************************************/ 548 549 /* 550 * Update internal state after the addition or removal of a "many" link 551 */ 552 static void 553 ng_one2many_update_many(priv_p priv) 554 { 555 uint16_t saveActive = priv->numActiveMany; 556 int linkNum; 557 558 /* Update list of which "many" links are up */ 559 priv->numActiveMany = 0; 560 for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) { 561 switch (priv->conf.failAlg) { 562 case NG_ONE2MANY_FAIL_MANUAL: 563 case NG_ONE2MANY_FAIL_NOTIFY: 564 if (priv->many[linkNum].hook != NULL 565 && priv->conf.enabledLinks[linkNum]) { 566 priv->activeMany[priv->numActiveMany] = linkNum; 567 priv->numActiveMany++; 568 } 569 break; 570 #ifdef INVARIANTS 571 default: 572 panic("%s: invalid failAlg", __func__); 573 #endif 574 } 575 } 576 577 if (priv->numActiveMany == 0 && saveActive > 0) 578 ng_one2many_notify(priv, NGM_LINK_IS_DOWN); 579 580 if (saveActive == 0 && priv->numActiveMany > 0) 581 ng_one2many_notify(priv, NGM_LINK_IS_UP); 582 583 /* Update transmit algorithm state */ 584 switch (priv->conf.xmitAlg) { 585 case NG_ONE2MANY_XMIT_ROUNDROBIN: 586 if (priv->numActiveMany > 0) 587 priv->nextMany %= priv->numActiveMany; 588 break; 589 case NG_ONE2MANY_XMIT_ALL: 590 case NG_ONE2MANY_XMIT_FAILOVER: 591 break; 592 #ifdef INVARIANTS 593 default: 594 panic("%s: invalid xmitAlg", __func__); 595 #endif 596 } 597 } 598 599 /* 600 * Notify upstream if we are out of links, or we have at least one link. 601 */ 602 static void 603 ng_one2many_notify(priv_p priv, uint32_t cmd) 604 { 605 struct ng_mesg *msg; 606 int dummy_error = 0; 607 608 if (priv->one.hook == NULL) 609 return; 610 611 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 612 if (msg != NULL) 613 NG_SEND_MSG_HOOK(dummy_error, priv->node, msg, priv->one.hook, 0); 614 }
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