Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_source.c
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1 /* 2 * ng_source.c 3 */ 4 5 /*- 6 * Copyright (c) 2005 Gleb Smirnoff <glebius@FreeBSD.org> 7 * Copyright 2002 Sandvine Inc. 8 * All rights reserved. 9 * 10 * Subject to the following obligations and disclaimer of warranty, use and 11 * redistribution of this software, in source or object code forms, with or 12 * without modifications are expressly permitted by Sandvine Inc.; provided, 13 * however, that: 14 * 1. Any and all reproductions of the source or object code must include the 15 * copyright notice above and the following disclaimer of warranties; and 16 * 2. No rights are granted, in any manner or form, to use Sandvine Inc. 17 * trademarks, including the mark "SANDVINE" on advertising, endorsements, 18 * or otherwise except as such appears in the above copyright notice or in 19 * the software. 20 * 21 * THIS SOFTWARE IS BEING PROVIDED BY SANDVINE "AS IS", AND TO THE MAXIMUM 22 * EXTENT PERMITTED BY LAW, SANDVINE MAKES NO REPRESENTATIONS OR WARRANTIES, 23 * EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, 24 * ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 25 * PURPOSE, OR NON-INFRINGEMENT. SANDVINE DOES NOT WARRANT, GUARANTEE, OR 26 * MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE 27 * USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY 28 * OR OTHERWISE. IN NO EVENT SHALL SANDVINE 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 SANDVINE IS ADVISED OF THE POSSIBILITY OF SUCH 36 * DAMAGE. 37 * 38 * Author: Dave Chapeskie <dchapeskie@sandvine.com> 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD: releng/6.0/sys/netgraph/ng_source.c 144674 2005-04-05 17:22:05Z glebius $"); 43 44 /* 45 * This node is used for high speed packet geneneration. It queues 46 * all data recieved on its 'input' hook and when told to start via 47 * a control message it sends the packets out its 'output' hook. In 48 * this way this node can be preloaded with a packet stream which it 49 * can then send continuously as fast as possible. 50 * 51 * Currently it just copies the mbufs as required. It could do various 52 * tricks to try and avoid this. Probably the best performance would 53 * be achieved by modifying the appropriate drivers to be told to 54 * self-re-enqueue packets (e.g. the if_bge driver could reuse the same 55 * transmit descriptors) under control of this node; perhaps via some 56 * flag in the mbuf or some such. The node could peek at an appropriate 57 * ifnet flag to see if such support is available for the connected 58 * interface. 59 */ 60 61 #include <sys/param.h> 62 #include <sys/systm.h> 63 #include <sys/errno.h> 64 #include <sys/kernel.h> 65 #include <sys/malloc.h> 66 #include <sys/mbuf.h> 67 #include <sys/socket.h> 68 #include <sys/syslog.h> 69 #include <net/if.h> 70 #include <net/if_var.h> 71 #include <netgraph/ng_message.h> 72 #include <netgraph/netgraph.h> 73 #include <netgraph/ng_parse.h> 74 #include <netgraph/ng_ether.h> 75 #include <netgraph/ng_source.h> 76 77 #define NG_SOURCE_INTR_TICKS 1 78 #define NG_SOURCE_DRIVER_IFQ_MAXLEN (4*1024) 79 80 /* Per node info */ 81 struct privdata { 82 node_p node; 83 hook_p input; 84 hook_p output; 85 struct ng_source_stats stats; 86 struct ifqueue snd_queue; /* packets to send */ 87 struct ifnet *output_ifp; 88 struct callout intr_ch; 89 uint64_t packets; /* packets to send */ 90 uint32_t queueOctets; 91 }; 92 typedef struct privdata *sc_p; 93 94 /* Node flags */ 95 #define NG_SOURCE_ACTIVE (NGF_TYPE1) 96 97 /* Netgraph methods */ 98 static ng_constructor_t ng_source_constructor; 99 static ng_rcvmsg_t ng_source_rcvmsg; 100 static ng_shutdown_t ng_source_rmnode; 101 static ng_newhook_t ng_source_newhook; 102 static ng_connect_t ng_source_connect; 103 static ng_rcvdata_t ng_source_rcvdata; 104 static ng_disconnect_t ng_source_disconnect; 105 106 /* Other functions */ 107 static void ng_source_intr(node_p, hook_p, void *, int); 108 static void ng_source_clr_data (sc_p); 109 static int ng_source_start (sc_p, uint64_t); 110 static void ng_source_stop (sc_p); 111 static int ng_source_send (sc_p, int, int *); 112 static int ng_source_store_output_ifp(sc_p, char *); 113 114 /* Parse type for timeval */ 115 static const struct ng_parse_struct_field ng_source_timeval_type_fields[] = { 116 { "tv_sec", &ng_parse_int32_type }, 117 { "tv_usec", &ng_parse_int32_type }, 118 { NULL } 119 }; 120 const struct ng_parse_type ng_source_timeval_type = { 121 &ng_parse_struct_type, 122 &ng_source_timeval_type_fields 123 }; 124 125 /* Parse type for struct ng_source_stats */ 126 static const struct ng_parse_struct_field ng_source_stats_type_fields[] 127 = NG_SOURCE_STATS_TYPE_INFO; 128 static const struct ng_parse_type ng_source_stats_type = { 129 &ng_parse_struct_type, 130 &ng_source_stats_type_fields 131 }; 132 133 /* List of commands and how to convert arguments to/from ASCII */ 134 static const struct ng_cmdlist ng_source_cmds[] = { 135 { 136 NGM_SOURCE_COOKIE, 137 NGM_SOURCE_GET_STATS, 138 "getstats", 139 NULL, 140 &ng_source_stats_type 141 }, 142 { 143 NGM_SOURCE_COOKIE, 144 NGM_SOURCE_CLR_STATS, 145 "clrstats", 146 NULL, 147 NULL 148 }, 149 { 150 NGM_SOURCE_COOKIE, 151 NGM_SOURCE_GETCLR_STATS, 152 "getclrstats", 153 NULL, 154 &ng_source_stats_type 155 }, 156 { 157 NGM_SOURCE_COOKIE, 158 NGM_SOURCE_START, 159 "start", 160 &ng_parse_uint64_type, 161 NULL 162 }, 163 { 164 NGM_SOURCE_COOKIE, 165 NGM_SOURCE_STOP, 166 "stop", 167 NULL, 168 NULL 169 }, 170 { 171 NGM_SOURCE_COOKIE, 172 NGM_SOURCE_CLR_DATA, 173 "clrdata", 174 NULL, 175 NULL 176 }, 177 { 178 NGM_SOURCE_COOKIE, 179 NGM_SOURCE_SETIFACE, 180 "setiface", 181 &ng_parse_string_type, 182 NULL 183 }, 184 { 0 } 185 }; 186 187 /* Netgraph type descriptor */ 188 static struct ng_type ng_source_typestruct = { 189 .version = NG_ABI_VERSION, 190 .name = NG_SOURCE_NODE_TYPE, 191 .constructor = ng_source_constructor, 192 .rcvmsg = ng_source_rcvmsg, 193 .shutdown = ng_source_rmnode, 194 .newhook = ng_source_newhook, 195 .connect = ng_source_connect, 196 .rcvdata = ng_source_rcvdata, 197 .disconnect = ng_source_disconnect, 198 .cmdlist = ng_source_cmds, 199 }; 200 NETGRAPH_INIT(source, &ng_source_typestruct); 201 202 static int ng_source_set_autosrc(sc_p, uint32_t); 203 204 /* 205 * Node constructor 206 */ 207 static int 208 ng_source_constructor(node_p node) 209 { 210 sc_p sc; 211 212 sc = malloc(sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO); 213 if (sc == NULL) 214 return (ENOMEM); 215 216 NG_NODE_SET_PRIVATE(node, sc); 217 sc->node = node; 218 sc->snd_queue.ifq_maxlen = 2048; /* XXX not checked */ 219 ng_callout_init(&sc->intr_ch); 220 221 return (0); 222 } 223 224 /* 225 * Add a hook 226 */ 227 static int 228 ng_source_newhook(node_p node, hook_p hook, const char *name) 229 { 230 sc_p sc = NG_NODE_PRIVATE(node); 231 232 if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) { 233 sc->input = hook; 234 } else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) { 235 sc->output = hook; 236 sc->output_ifp = 0; 237 bzero(&sc->stats, sizeof(sc->stats)); 238 } else 239 return (EINVAL); 240 241 return (0); 242 } 243 244 /* 245 * Hook has been added 246 */ 247 static int 248 ng_source_connect(hook_p hook) 249 { 250 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 251 struct ng_mesg *msg; 252 int dummy_error = 0; 253 254 /* 255 * If this is "output" hook, then request information 256 * from our downstream. 257 */ 258 if (hook == sc->output) { 259 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME, 260 0, M_NOWAIT); 261 if (msg == NULL) 262 return (ENOBUFS); 263 264 /* 265 * Our hook and peer hook have HK_INVALID flag set, 266 * so we can't use NG_SEND_MSG_HOOK() macro here. 267 */ 268 NG_SEND_MSG_ID(dummy_error, sc->node, msg, 269 NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node)); 270 } 271 272 return (0); 273 } 274 275 /* 276 * Receive a control message 277 */ 278 static int 279 ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook) 280 { 281 sc_p sc = NG_NODE_PRIVATE(node); 282 struct ng_mesg *msg, *resp = NULL; 283 int error = 0; 284 285 NGI_GET_MSG(item, msg); 286 287 switch (msg->header.typecookie) { 288 case NGM_SOURCE_COOKIE: 289 if (msg->header.flags & NGF_RESP) { 290 error = EINVAL; 291 break; 292 } 293 switch (msg->header.cmd) { 294 case NGM_SOURCE_GET_STATS: 295 case NGM_SOURCE_CLR_STATS: 296 case NGM_SOURCE_GETCLR_STATS: 297 { 298 struct ng_source_stats *stats; 299 300 if (msg->header.cmd != NGM_SOURCE_CLR_STATS) { 301 NG_MKRESPONSE(resp, msg, 302 sizeof(*stats), M_NOWAIT); 303 if (resp == NULL) { 304 error = ENOMEM; 305 goto done; 306 } 307 sc->stats.queueOctets = sc->queueOctets; 308 sc->stats.queueFrames = sc->snd_queue.ifq_len; 309 if ((sc->node->nd_flags & NG_SOURCE_ACTIVE) 310 && !timevalisset(&sc->stats.endTime)) { 311 getmicrotime(&sc->stats.elapsedTime); 312 timevalsub(&sc->stats.elapsedTime, 313 &sc->stats.startTime); 314 } 315 stats = (struct ng_source_stats *)resp->data; 316 bcopy(&sc->stats, stats, sizeof(* stats)); 317 } 318 if (msg->header.cmd != NGM_SOURCE_GET_STATS) 319 bzero(&sc->stats, sizeof(sc->stats)); 320 } 321 break; 322 case NGM_SOURCE_START: 323 { 324 uint64_t packets; 325 326 if (msg->header.arglen != sizeof(uint64_t)) { 327 error = EINVAL; 328 break; 329 } 330 331 packets = *(uint64_t *)msg->data; 332 333 error = ng_source_start(sc, packets); 334 335 break; 336 } 337 case NGM_SOURCE_STOP: 338 ng_source_stop(sc); 339 break; 340 case NGM_SOURCE_CLR_DATA: 341 ng_source_clr_data(sc); 342 break; 343 case NGM_SOURCE_SETIFACE: 344 { 345 char *ifname = (char *)msg->data; 346 347 if (msg->header.arglen < 2) { 348 error = EINVAL; 349 break; 350 } 351 352 ng_source_store_output_ifp(sc, ifname); 353 break; 354 } 355 default: 356 error = EINVAL; 357 break; 358 } 359 break; 360 case NGM_ETHER_COOKIE: 361 if (!(msg->header.flags & NGF_RESP)) { 362 error = EINVAL; 363 break; 364 } 365 switch (msg->header.cmd) { 366 case NGM_ETHER_GET_IFNAME: 367 { 368 char *ifname = (char *)msg->data; 369 370 if (msg->header.arglen < 2) { 371 error = EINVAL; 372 break; 373 } 374 375 if (ng_source_store_output_ifp(sc, ifname) == 0) 376 ng_source_set_autosrc(sc, 0); 377 break; 378 } 379 default: 380 error = EINVAL; 381 } 382 break; 383 default: 384 error = EINVAL; 385 break; 386 } 387 388 done: 389 /* Take care of synchronous response, if any. */ 390 NG_RESPOND_MSG(error, node, item, resp); 391 /* Free the message and return. */ 392 NG_FREE_MSG(msg); 393 return (error); 394 } 395 396 /* 397 * Receive data on a hook 398 * 399 * If data comes in the input hook, enqueue it on the send queue. 400 * If data comes in the output hook, discard it. 401 */ 402 static int 403 ng_source_rcvdata(hook_p hook, item_p item) 404 { 405 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 406 struct mbuf *m; 407 int error = 0; 408 409 NGI_GET_M(item, m); 410 NG_FREE_ITEM(item); 411 412 /* Which hook? */ 413 if (hook == sc->output) { 414 /* discard */ 415 NG_FREE_M(m); 416 return (error); 417 } 418 KASSERT(hook == sc->input, ("%s: no hook!", __func__)); 419 420 /* Enqueue packet. */ 421 /* XXX should we check IF_QFULL() ? */ 422 _IF_ENQUEUE(&sc->snd_queue, m); 423 sc->queueOctets += m->m_pkthdr.len; 424 425 return (0); 426 } 427 428 /* 429 * Shutdown processing 430 */ 431 static int 432 ng_source_rmnode(node_p node) 433 { 434 sc_p sc = NG_NODE_PRIVATE(node); 435 436 ng_source_stop(sc); 437 ng_source_clr_data(sc); 438 NG_NODE_SET_PRIVATE(node, NULL); 439 NG_NODE_UNREF(node); 440 free(sc, M_NETGRAPH); 441 442 return (0); 443 } 444 445 /* 446 * Hook disconnection 447 */ 448 static int 449 ng_source_disconnect(hook_p hook) 450 { 451 sc_p sc; 452 453 sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 454 KASSERT(sc != NULL, ("%s: null node private", __func__)); 455 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output) 456 ng_rmnode_self(NG_HOOK_NODE(hook)); 457 return (0); 458 } 459 460 /* 461 * Set sc->output_ifp to point to the the struct ifnet of the interface 462 * reached via our output hook. 463 */ 464 static int 465 ng_source_store_output_ifp(sc_p sc, char *ifname) 466 { 467 struct ifnet *ifp; 468 int s; 469 470 ifp = ifunit(ifname); 471 472 if (ifp == NULL) { 473 printf("%s: can't find interface %d\n", __func__, if_index); 474 return (EINVAL); 475 } 476 sc->output_ifp = ifp; 477 478 #if 1 479 /* XXX mucking with a drivers ifqueue size is ugly but we need it 480 * to queue a lot of packets to get close to line rate on a gigabit 481 * interface with small packets. 482 * XXX we should restore the original value at stop or disconnect 483 */ 484 s = splimp(); /* XXX is this required? */ 485 if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) { 486 printf("ng_source: changing ifq_maxlen from %d to %d\n", 487 ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN); 488 ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN; 489 } 490 splx(s); 491 #endif 492 return (0); 493 } 494 495 /* 496 * Set the attached ethernet node's ethernet source address override flag. 497 */ 498 static int 499 ng_source_set_autosrc(sc_p sc, uint32_t flag) 500 { 501 struct ng_mesg *msg; 502 int error = 0; 503 504 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC, 505 sizeof (uint32_t), M_NOWAIT); 506 if (msg == NULL) 507 return(ENOBUFS); 508 509 *(uint32_t *)msg->data = flag; 510 NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0); 511 return (error); 512 } 513 514 /* 515 * Clear out the data we've queued 516 */ 517 static void 518 ng_source_clr_data (sc_p sc) 519 { 520 struct mbuf *m; 521 522 for (;;) { 523 _IF_DEQUEUE(&sc->snd_queue, m); 524 if (m == NULL) 525 break; 526 NG_FREE_M(m); 527 } 528 sc->queueOctets = 0; 529 } 530 531 /* 532 * Start sending queued data out the output hook 533 */ 534 static int 535 ng_source_start(sc_p sc, uint64_t packets) 536 { 537 if (sc->output_ifp == NULL) { 538 printf("ng_source: start without iface configured\n"); 539 return (ENXIO); 540 } 541 542 if (sc->node->nd_flags & NG_SOURCE_ACTIVE) 543 return (EBUSY); 544 545 sc->node->nd_flags |= NG_SOURCE_ACTIVE; 546 547 sc->packets = packets; 548 timevalclear(&sc->stats.elapsedTime); 549 timevalclear(&sc->stats.endTime); 550 getmicrotime(&sc->stats.startTime); 551 ng_callout(&sc->intr_ch, sc->node, NULL, 0, 552 ng_source_intr, sc, 0); 553 554 return (0); 555 } 556 557 /* 558 * Stop sending queued data out the output hook 559 */ 560 static void 561 ng_source_stop(sc_p sc) 562 { 563 ng_uncallout(&sc->intr_ch, sc->node); 564 sc->node->nd_flags &= ~NG_SOURCE_ACTIVE; 565 getmicrotime(&sc->stats.endTime); 566 sc->stats.elapsedTime = sc->stats.endTime; 567 timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime); 568 } 569 570 /* 571 * While active called every NG_SOURCE_INTR_TICKS ticks. 572 * Sends as many packets as the interface connected to our 573 * output hook is able to enqueue. 574 */ 575 static void 576 ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2) 577 { 578 sc_p sc = (sc_p)arg1; 579 struct ifqueue *ifq; 580 int packets; 581 582 KASSERT(sc != NULL, ("%s: null node private", __func__)); 583 584 if (sc->packets == 0 || sc->output == NULL 585 || (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) { 586 ng_source_stop(sc); 587 return; 588 } 589 590 if (sc->output_ifp != NULL) { 591 ifq = (struct ifqueue *)&sc->output_ifp->if_snd; 592 packets = ifq->ifq_maxlen - ifq->ifq_len; 593 } else 594 packets = sc->snd_queue.ifq_len; 595 596 ng_source_send(sc, packets, NULL); 597 if (sc->packets == 0) 598 ng_source_stop(sc); 599 else 600 ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS, 601 ng_source_intr, sc, 0); 602 } 603 604 /* 605 * Send packets out our output hook 606 */ 607 static int 608 ng_source_send (sc_p sc, int tosend, int *sent_p) 609 { 610 struct ifqueue tmp_queue; 611 struct mbuf *m, *m2; 612 int sent = 0; 613 int error = 0; 614 615 KASSERT(tosend >= 0, ("%s: negative tosend param", __func__)); 616 KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE, 617 ("%s: inactive node", __func__)); 618 619 if ((uint64_t)tosend > sc->packets) 620 tosend = sc->packets; 621 622 /* Copy the required number of packets to a temporary queue */ 623 bzero (&tmp_queue, sizeof (tmp_queue)); 624 for (sent = 0; error == 0 && sent < tosend; ++sent) { 625 _IF_DEQUEUE(&sc->snd_queue, m); 626 if (m == NULL) 627 break; 628 629 /* duplicate the packet */ 630 m2 = m_copypacket(m, M_DONTWAIT); 631 if (m2 == NULL) { 632 _IF_PREPEND(&sc->snd_queue, m); 633 error = ENOBUFS; 634 break; 635 } 636 637 /* Re-enqueue the original packet for us. */ 638 _IF_ENQUEUE(&sc->snd_queue, m); 639 640 /* Queue the copy for sending at splimp. */ 641 _IF_ENQUEUE(&tmp_queue, m2); 642 } 643 644 sent = 0; 645 for (;;) { 646 _IF_DEQUEUE(&tmp_queue, m2); 647 if (m2 == NULL) 648 break; 649 if (error == 0) { 650 ++sent; 651 sc->stats.outFrames++; 652 sc->stats.outOctets += m2->m_pkthdr.len; 653 NG_SEND_DATA_ONLY(error, sc->output, m2); 654 if (error) 655 log(LOG_DEBUG, "%s: error=%d", __func__, error); 656 } else { 657 NG_FREE_M(m2); 658 } 659 } 660 661 sc->packets -= sent; 662 if (sent_p != NULL) 663 *sent_p = sent; 664 return (error); 665 }
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