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 * $FreeBSD$ 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 according 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_WAITOK | M_ZERO); 191 priv->conf.xmitAlg = NG_ONE2MANY_XMIT_ROUNDROBIN; 192 priv->conf.failAlg = NG_ONE2MANY_FAIL_MANUAL; 193 194 /* cross reference */ 195 NG_NODE_SET_PRIVATE(node, priv); 196 priv->node = node; 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] == '0' && cp[1] != '\0')) 221 return (EINVAL); 222 i = strtoul(cp, &eptr, 10); 223 if (*eptr != '\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 case NG_ONE2MANY_XMIT_FAILOVER: 280 break; 281 default: 282 error = EINVAL; 283 break; 284 } 285 switch (conf->failAlg) { 286 case NG_ONE2MANY_FAIL_MANUAL: 287 case NG_ONE2MANY_FAIL_NOTIFY: 288 break; 289 default: 290 error = EINVAL; 291 break; 292 } 293 if (error != 0) 294 break; 295 296 /* Normalized many link enabled bits */ 297 for (i = 0; i < NG_ONE2MANY_MAX_LINKS; i++) 298 conf->enabledLinks[i] = !!conf->enabledLinks[i]; 299 300 /* Copy config and reset */ 301 bcopy(conf, &priv->conf, sizeof(*conf)); 302 ng_one2many_update_many(priv); 303 break; 304 } 305 case NGM_ONE2MANY_GET_CONFIG: 306 { 307 struct ng_one2many_config *conf; 308 309 NG_MKRESPONSE(resp, msg, sizeof(*conf), M_NOWAIT); 310 if (resp == NULL) { 311 error = ENOMEM; 312 break; 313 } 314 conf = (struct ng_one2many_config *)resp->data; 315 bcopy(&priv->conf, conf, sizeof(priv->conf)); 316 break; 317 } 318 case NGM_ONE2MANY_GET_STATS: 319 case NGM_ONE2MANY_CLR_STATS: 320 case NGM_ONE2MANY_GETCLR_STATS: 321 { 322 struct ng_one2many_link *link; 323 int linkNum; 324 325 /* Get link */ 326 if (msg->header.arglen != sizeof(int32_t)) { 327 error = EINVAL; 328 break; 329 } 330 linkNum = *((int32_t *)msg->data); 331 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) 332 link = &priv->one; 333 else if (linkNum >= 0 334 && linkNum < NG_ONE2MANY_MAX_LINKS) { 335 link = &priv->many[linkNum]; 336 } else { 337 error = EINVAL; 338 break; 339 } 340 341 /* Get/clear stats */ 342 if (msg->header.cmd != NGM_ONE2MANY_CLR_STATS) { 343 NG_MKRESPONSE(resp, msg, 344 sizeof(link->stats), M_NOWAIT); 345 if (resp == NULL) { 346 error = ENOMEM; 347 break; 348 } 349 bcopy(&link->stats, 350 resp->data, sizeof(link->stats)); 351 } 352 if (msg->header.cmd != NGM_ONE2MANY_GET_STATS) 353 bzero(&link->stats, sizeof(link->stats)); 354 break; 355 } 356 default: 357 error = EINVAL; 358 break; 359 } 360 break; 361 /* 362 * One of our downstreams notifies us of link change. If we are 363 * configured to listen to these message, then we remove/add 364 * this hook from array of active hooks. 365 */ 366 case NGM_FLOW_COOKIE: 367 { 368 int linkNum; 369 370 if (priv->conf.failAlg != NG_ONE2MANY_FAIL_NOTIFY) 371 break; 372 373 if (lasthook == NULL) 374 break; 375 376 linkNum = (intptr_t)NG_HOOK_PRIVATE(lasthook); 377 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) 378 break; 379 380 KASSERT((linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS), 381 ("%s: linkNum=%d", __func__, linkNum)); 382 383 switch (msg->header.cmd) { 384 case NGM_LINK_IS_UP: 385 priv->conf.enabledLinks[linkNum] = 1; 386 ng_one2many_update_many(priv); 387 break; 388 case NGM_LINK_IS_DOWN: 389 priv->conf.enabledLinks[linkNum] = 0; 390 ng_one2many_update_many(priv); 391 break; 392 default: 393 break; 394 } 395 break; 396 } 397 default: 398 error = EINVAL; 399 break; 400 } 401 402 /* Done */ 403 NG_RESPOND_MSG(error, node, item, resp); 404 NG_FREE_MSG(msg); 405 return (error); 406 } 407 408 /* 409 * Receive data on a hook 410 */ 411 static int 412 ng_one2many_rcvdata(hook_p hook, item_p item) 413 { 414 const node_p node = NG_HOOK_NODE(hook); 415 const priv_p priv = NG_NODE_PRIVATE(node); 416 struct ng_one2many_link *src; 417 struct ng_one2many_link *dst = NULL; 418 int error = 0; 419 int linkNum; 420 int i; 421 struct mbuf *m; 422 423 m = NGI_M(item); /* just peaking, mbuf still owned by item */ 424 /* Get link number */ 425 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook); 426 KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM 427 || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS), 428 ("%s: linkNum=%d", __func__, linkNum)); 429 430 /* Figure out source link */ 431 src = (linkNum == NG_ONE2MANY_ONE_LINKNUM) ? 432 &priv->one : &priv->many[linkNum]; 433 KASSERT(src->hook != NULL, ("%s: no src%d", __func__, linkNum)); 434 435 /* Update receive stats */ 436 src->stats.recvPackets++; 437 src->stats.recvOctets += m->m_pkthdr.len; 438 439 /* Figure out destination link */ 440 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) { 441 if (priv->numActiveMany == 0) { 442 NG_FREE_ITEM(item); 443 return (ENOTCONN); 444 } 445 switch(priv->conf.xmitAlg) { 446 case NG_ONE2MANY_XMIT_ROUNDROBIN: 447 dst = &priv->many[priv->activeMany[priv->nextMany]]; 448 priv->nextMany = (priv->nextMany + 1) % priv->numActiveMany; 449 break; 450 case NG_ONE2MANY_XMIT_ALL: 451 /* no need to copy data for the 1st one */ 452 dst = &priv->many[priv->activeMany[0]]; 453 454 /* make modifiable copies of data and send for all 455 * links except the first one, which we'll do last 456 */ 457 for (i = 1; i < priv->numActiveMany; i++) { 458 struct mbuf *m2; 459 struct ng_one2many_link *mdst; 460 461 mdst = &priv->many[priv->activeMany[i]]; 462 m2 = m_dup(m, M_NOWAIT); 463 if (m2 == NULL) { 464 mdst->stats.memoryFailures++; 465 NG_FREE_ITEM(item); 466 NG_FREE_M(m); 467 return (ENOBUFS); 468 } 469 /* Update transmit stats */ 470 mdst->stats.xmitPackets++; 471 mdst->stats.xmitOctets += m->m_pkthdr.len; 472 NG_SEND_DATA_ONLY(error, mdst->hook, m2); 473 } 474 break; 475 case NG_ONE2MANY_XMIT_FAILOVER: 476 dst = &priv->many[priv->activeMany[0]]; 477 break; 478 #ifdef INVARIANTS 479 default: 480 panic("%s: invalid xmitAlg", __func__); 481 #endif 482 } 483 } else { 484 dst = &priv->one; 485 } 486 487 /* Update transmit stats */ 488 dst->stats.xmitPackets++; 489 dst->stats.xmitOctets += m->m_pkthdr.len; 490 491 /* Deliver packet */ 492 NG_FWD_ITEM_HOOK(error, item, dst->hook); 493 return (error); 494 } 495 496 /* 497 * Shutdown node 498 */ 499 static int 500 ng_one2many_shutdown(node_p node) 501 { 502 const priv_p priv = NG_NODE_PRIVATE(node); 503 504 KASSERT(priv->numActiveMany == 0, 505 ("%s: numActiveMany=%d", __func__, priv->numActiveMany)); 506 free(priv, M_NETGRAPH); 507 NG_NODE_SET_PRIVATE(node, NULL); 508 NG_NODE_UNREF(node); 509 return (0); 510 } 511 512 /* 513 * Hook disconnection. 514 */ 515 static int 516 ng_one2many_disconnect(hook_p hook) 517 { 518 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 519 int linkNum; 520 521 /* Get link number */ 522 linkNum = (intptr_t)NG_HOOK_PRIVATE(hook); 523 KASSERT(linkNum == NG_ONE2MANY_ONE_LINKNUM 524 || (linkNum >= 0 && linkNum < NG_ONE2MANY_MAX_LINKS), 525 ("%s: linkNum=%d", __func__, linkNum)); 526 527 /* Nuke the link */ 528 if (linkNum == NG_ONE2MANY_ONE_LINKNUM) 529 priv->one.hook = NULL; 530 else { 531 priv->many[linkNum].hook = NULL; 532 priv->conf.enabledLinks[linkNum] = 0; 533 ng_one2many_update_many(priv); 534 } 535 536 /* If no hooks left, go away */ 537 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 538 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 539 ng_rmnode_self(NG_HOOK_NODE(hook)); 540 return (0); 541 } 542 543 /****************************************************************** 544 OTHER FUNCTIONS 545 ******************************************************************/ 546 547 /* 548 * Update internal state after the addition or removal of a "many" link 549 */ 550 static void 551 ng_one2many_update_many(priv_p priv) 552 { 553 uint16_t saveActive = priv->numActiveMany; 554 int linkNum; 555 556 /* Update list of which "many" links are up */ 557 priv->numActiveMany = 0; 558 for (linkNum = 0; linkNum < NG_ONE2MANY_MAX_LINKS; linkNum++) { 559 switch (priv->conf.failAlg) { 560 case NG_ONE2MANY_FAIL_MANUAL: 561 case NG_ONE2MANY_FAIL_NOTIFY: 562 if (priv->many[linkNum].hook != NULL 563 && priv->conf.enabledLinks[linkNum]) { 564 priv->activeMany[priv->numActiveMany] = linkNum; 565 priv->numActiveMany++; 566 } 567 break; 568 #ifdef INVARIANTS 569 default: 570 panic("%s: invalid failAlg", __func__); 571 #endif 572 } 573 } 574 575 if (priv->numActiveMany == 0 && saveActive > 0) 576 ng_one2many_notify(priv, NGM_LINK_IS_DOWN); 577 578 if (saveActive == 0 && priv->numActiveMany > 0) 579 ng_one2many_notify(priv, NGM_LINK_IS_UP); 580 581 /* Update transmit algorithm state */ 582 switch (priv->conf.xmitAlg) { 583 case NG_ONE2MANY_XMIT_ROUNDROBIN: 584 if (priv->numActiveMany > 0) 585 priv->nextMany %= priv->numActiveMany; 586 break; 587 case NG_ONE2MANY_XMIT_ALL: 588 case NG_ONE2MANY_XMIT_FAILOVER: 589 break; 590 #ifdef INVARIANTS 591 default: 592 panic("%s: invalid xmitAlg", __func__); 593 #endif 594 } 595 } 596 597 /* 598 * Notify upstream if we are out of links, or we have at least one link. 599 */ 600 static void 601 ng_one2many_notify(priv_p priv, uint32_t cmd) 602 { 603 struct ng_mesg *msg; 604 int dummy_error = 0; 605 606 if (priv->one.hook == NULL) 607 return; 608 609 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 610 if (msg != NULL) 611 NG_SEND_MSG_HOOK(dummy_error, priv->node, msg, priv->one.hook, 0); 612 } 613