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 * $FreeBSD: src/sys/netgraph/ng_source.c,v 1.30 2007/03/02 14:36:19 emaste Exp $ 41 * $DragonFly: src/sys/netgraph7/ng_source.c,v 1.2 2008/06/26 23:05:35 dillon Exp $ 42 */ 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 "ng_message.h" 72 #include "netgraph.h" 73 #include "ng_parse.h" 74 #include "ng_ether.h" 75 #include "ng_source.h" 76 77 #define NG_SOURCE_INTR_TICKS 1 78 #define NG_SOURCE_DRIVER_IFQ_MAXLEN (4*1024) 79 80 #define mtod_off(m,off,t) ((t)(mtod((m),caddr_t)+(off))) 81 82 /* Per node info */ 83 struct privdata { 84 node_p node; 85 hook_p input; 86 hook_p output; 87 struct ng_source_stats stats; 88 struct ifqueue snd_queue; /* packets to send */ 89 struct mbuf *last_packet; /* last pkt in queue */ 90 struct ifnet *output_ifp; 91 struct callout intr_ch; 92 uint64_t packets; /* packets to send */ 93 uint32_t queueOctets; 94 struct ng_source_embed_info embed_timestamp; 95 struct ng_source_embed_cnt_info embed_counter[NG_SOURCE_COUNTERS]; 96 }; 97 typedef struct privdata *sc_p; 98 99 /* Node flags */ 100 #define NG_SOURCE_ACTIVE (NGF_TYPE1) 101 102 /* Netgraph methods */ 103 static ng_constructor_t ng_source_constructor; 104 static ng_rcvmsg_t ng_source_rcvmsg; 105 static ng_shutdown_t ng_source_rmnode; 106 static ng_newhook_t ng_source_newhook; 107 static ng_connect_t ng_source_connect; 108 static ng_rcvdata_t ng_source_rcvdata; 109 static ng_disconnect_t ng_source_disconnect; 110 111 /* Other functions */ 112 static void ng_source_intr(node_p, hook_p, void *, int); 113 static void ng_source_clr_data (sc_p); 114 static int ng_source_start (sc_p, uint64_t); 115 static void ng_source_stop (sc_p); 116 static int ng_source_send (sc_p, int, int *); 117 static int ng_source_store_output_ifp(sc_p, char *); 118 static void ng_source_packet_mod(sc_p, struct mbuf *, 119 int, int, caddr_t, int); 120 static void ng_source_mod_counter(sc_p sc, 121 struct ng_source_embed_cnt_info *cnt, 122 struct mbuf *m, int increment); 123 static int ng_source_dup_mod(sc_p, struct mbuf *, 124 struct mbuf **); 125 126 /* Parse type for timeval */ 127 static const struct ng_parse_struct_field ng_source_timeval_type_fields[] = { 128 { "tv_sec", &ng_parse_int32_type }, 129 { "tv_usec", &ng_parse_int32_type }, 130 { NULL } 131 }; 132 const struct ng_parse_type ng_source_timeval_type = { 133 &ng_parse_struct_type, 134 &ng_source_timeval_type_fields 135 }; 136 137 /* Parse type for struct ng_source_stats */ 138 static const struct ng_parse_struct_field ng_source_stats_type_fields[] 139 = NG_SOURCE_STATS_TYPE_INFO; 140 static const struct ng_parse_type ng_source_stats_type = { 141 &ng_parse_struct_type, 142 &ng_source_stats_type_fields 143 }; 144 145 /* Parse type for struct ng_source_embed_info */ 146 static const struct ng_parse_struct_field ng_source_embed_type_fields[] = 147 NG_SOURCE_EMBED_TYPE_INFO; 148 static const struct ng_parse_type ng_source_embed_type = { 149 &ng_parse_struct_type, 150 &ng_source_embed_type_fields 151 }; 152 153 /* Parse type for struct ng_source_embed_cnt_info */ 154 static const struct ng_parse_struct_field ng_source_embed_cnt_type_fields[] = 155 NG_SOURCE_EMBED_CNT_TYPE_INFO; 156 static const struct ng_parse_type ng_source_embed_cnt_type = { 157 &ng_parse_struct_type, 158 &ng_source_embed_cnt_type_fields 159 }; 160 161 /* List of commands and how to convert arguments to/from ASCII */ 162 static const struct ng_cmdlist ng_source_cmds[] = { 163 { 164 NGM_SOURCE_COOKIE, 165 NGM_SOURCE_GET_STATS, 166 "getstats", 167 NULL, 168 &ng_source_stats_type 169 }, 170 { 171 NGM_SOURCE_COOKIE, 172 NGM_SOURCE_CLR_STATS, 173 "clrstats", 174 NULL, 175 NULL 176 }, 177 { 178 NGM_SOURCE_COOKIE, 179 NGM_SOURCE_GETCLR_STATS, 180 "getclrstats", 181 NULL, 182 &ng_source_stats_type 183 }, 184 { 185 NGM_SOURCE_COOKIE, 186 NGM_SOURCE_START, 187 "start", 188 &ng_parse_uint64_type, 189 NULL 190 }, 191 { 192 NGM_SOURCE_COOKIE, 193 NGM_SOURCE_STOP, 194 "stop", 195 NULL, 196 NULL 197 }, 198 { 199 NGM_SOURCE_COOKIE, 200 NGM_SOURCE_CLR_DATA, 201 "clrdata", 202 NULL, 203 NULL 204 }, 205 { 206 NGM_SOURCE_COOKIE, 207 NGM_SOURCE_SETIFACE, 208 "setiface", 209 &ng_parse_string_type, 210 NULL 211 }, 212 { 213 NGM_SOURCE_COOKIE, 214 NGM_SOURCE_SETPPS, 215 "setpps", 216 &ng_parse_uint32_type, 217 NULL 218 }, 219 { 220 NGM_SOURCE_COOKIE, 221 NGM_SOURCE_SET_TIMESTAMP, 222 "settimestamp", 223 &ng_source_embed_type, 224 NULL 225 }, 226 { 227 NGM_SOURCE_COOKIE, 228 NGM_SOURCE_GET_TIMESTAMP, 229 "gettimestamp", 230 NULL, 231 &ng_source_embed_type 232 }, 233 { 234 NGM_SOURCE_COOKIE, 235 NGM_SOURCE_SET_COUNTER, 236 "setcounter", 237 &ng_source_embed_cnt_type, 238 NULL 239 }, 240 { 241 NGM_SOURCE_COOKIE, 242 NGM_SOURCE_GET_COUNTER, 243 "getcounter", 244 &ng_parse_uint8_type, 245 &ng_source_embed_cnt_type 246 }, 247 { 0 } 248 }; 249 250 /* Netgraph type descriptor */ 251 static struct ng_type ng_source_typestruct = { 252 .version = NG_ABI_VERSION, 253 .name = NG_SOURCE_NODE_TYPE, 254 .constructor = ng_source_constructor, 255 .rcvmsg = ng_source_rcvmsg, 256 .shutdown = ng_source_rmnode, 257 .newhook = ng_source_newhook, 258 .connect = ng_source_connect, 259 .rcvdata = ng_source_rcvdata, 260 .disconnect = ng_source_disconnect, 261 .cmdlist = ng_source_cmds, 262 }; 263 NETGRAPH_INIT(source, &ng_source_typestruct); 264 265 static int ng_source_set_autosrc(sc_p, uint32_t); 266 267 /* 268 * Node constructor 269 */ 270 static int 271 ng_source_constructor(node_p node) 272 { 273 sc_p sc; 274 275 sc = kmalloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_NULLOK | M_ZERO); 276 if (sc == NULL) 277 return (ENOMEM); 278 279 NG_NODE_SET_PRIVATE(node, sc); 280 sc->node = node; 281 sc->snd_queue.ifq_maxlen = 2048; /* XXX not checked */ 282 ng_callout_init(&sc->intr_ch); 283 284 return (0); 285 } 286 287 /* 288 * Add a hook 289 */ 290 static int 291 ng_source_newhook(node_p node, hook_p hook, const char *name) 292 { 293 sc_p sc = NG_NODE_PRIVATE(node); 294 295 if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) { 296 sc->input = hook; 297 } else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) { 298 sc->output = hook; 299 sc->output_ifp = 0; 300 bzero(&sc->stats, sizeof(sc->stats)); 301 } else 302 return (EINVAL); 303 304 return (0); 305 } 306 307 /* 308 * Hook has been added 309 */ 310 static int 311 ng_source_connect(hook_p hook) 312 { 313 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 314 struct ng_mesg *msg; 315 int dummy_error = 0; 316 317 /* 318 * If this is "output" hook, then request information 319 * from our downstream. 320 */ 321 if (hook == sc->output) { 322 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME, 323 0, M_WAITOK | M_NULLOK); 324 if (msg == NULL) 325 return (ENOBUFS); 326 327 /* 328 * Our hook and peer hook have HK_INVALID flag set, 329 * so we can't use NG_SEND_MSG_HOOK() macro here. 330 */ 331 NG_SEND_MSG_ID(dummy_error, sc->node, msg, 332 NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node)); 333 } 334 335 return (0); 336 } 337 338 /* 339 * Receive a control message 340 */ 341 static int 342 ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook) 343 { 344 sc_p sc = NG_NODE_PRIVATE(node); 345 struct ng_mesg *msg, *resp = NULL; 346 int error = 0; 347 348 NGI_GET_MSG(item, msg); 349 350 switch (msg->header.typecookie) { 351 case NGM_SOURCE_COOKIE: 352 if (msg->header.flags & NGF_RESP) { 353 error = EINVAL; 354 break; 355 } 356 switch (msg->header.cmd) { 357 case NGM_SOURCE_GET_STATS: 358 case NGM_SOURCE_CLR_STATS: 359 case NGM_SOURCE_GETCLR_STATS: 360 { 361 struct ng_source_stats *stats; 362 363 if (msg->header.cmd != NGM_SOURCE_CLR_STATS) { 364 NG_MKRESPONSE(resp, msg, 365 sizeof(*stats), M_WAITOK | M_NULLOK); 366 if (resp == NULL) { 367 error = ENOMEM; 368 goto done; 369 } 370 sc->stats.queueOctets = sc->queueOctets; 371 sc->stats.queueFrames = sc->snd_queue.ifq_len; 372 if ((sc->node->nd_flags & NG_SOURCE_ACTIVE) 373 && !timevalisset(&sc->stats.endTime)) { 374 getmicrotime(&sc->stats.elapsedTime); 375 timevalsub(&sc->stats.elapsedTime, 376 &sc->stats.startTime); 377 } 378 stats = (struct ng_source_stats *)resp->data; 379 bcopy(&sc->stats, stats, sizeof(* stats)); 380 } 381 if (msg->header.cmd != NGM_SOURCE_GET_STATS) 382 bzero(&sc->stats, sizeof(sc->stats)); 383 } 384 break; 385 case NGM_SOURCE_START: 386 { 387 uint64_t packets; 388 389 if (msg->header.arglen != sizeof(uint64_t)) { 390 error = EINVAL; 391 break; 392 } 393 394 packets = *(uint64_t *)msg->data; 395 396 error = ng_source_start(sc, packets); 397 398 break; 399 } 400 case NGM_SOURCE_STOP: 401 ng_source_stop(sc); 402 break; 403 case NGM_SOURCE_CLR_DATA: 404 ng_source_clr_data(sc); 405 break; 406 case NGM_SOURCE_SETIFACE: 407 { 408 char *ifname = (char *)msg->data; 409 410 if (msg->header.arglen < 2) { 411 error = EINVAL; 412 break; 413 } 414 415 ng_source_store_output_ifp(sc, ifname); 416 break; 417 } 418 case NGM_SOURCE_SETPPS: 419 { 420 uint32_t pps; 421 422 if (msg->header.arglen != sizeof(uint32_t)) { 423 error = EINVAL; 424 break; 425 } 426 427 pps = *(uint32_t *)msg->data; 428 429 sc->stats.maxPps = pps; 430 431 break; 432 } 433 case NGM_SOURCE_SET_TIMESTAMP: 434 { 435 struct ng_source_embed_info *embed; 436 437 if (msg->header.arglen != sizeof(*embed)) { 438 error = EINVAL; 439 goto done; 440 } 441 embed = (struct ng_source_embed_info *)msg->data; 442 bcopy(embed, &sc->embed_timestamp, sizeof(*embed)); 443 444 break; 445 } 446 case NGM_SOURCE_GET_TIMESTAMP: 447 { 448 struct ng_source_embed_info *embed; 449 450 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_WAITOK); 451 if (resp == NULL) { 452 error = ENOMEM; 453 goto done; 454 } 455 embed = (struct ng_source_embed_info *)resp->data; 456 bcopy(&sc->embed_timestamp, embed, sizeof(*embed)); 457 458 break; 459 } 460 case NGM_SOURCE_SET_COUNTER: 461 { 462 struct ng_source_embed_cnt_info *embed; 463 464 if (msg->header.arglen != sizeof(*embed)) { 465 error = EINVAL; 466 goto done; 467 } 468 embed = (struct ng_source_embed_cnt_info *)msg->data; 469 if (embed->index >= NG_SOURCE_COUNTERS || 470 !(embed->width == 1 || embed->width == 2 || 471 embed->width == 4)) { 472 error = EINVAL; 473 goto done; 474 } 475 bcopy(embed, &sc->embed_counter[embed->index], 476 sizeof(*embed)); 477 478 break; 479 } 480 case NGM_SOURCE_GET_COUNTER: 481 { 482 uint8_t index = *(uint8_t *)msg->data; 483 struct ng_source_embed_cnt_info *embed; 484 485 if (index >= NG_SOURCE_COUNTERS) { 486 error = EINVAL; 487 goto done; 488 } 489 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_WAITOK); 490 if (resp == NULL) { 491 error = ENOMEM; 492 goto done; 493 } 494 embed = (struct ng_source_embed_cnt_info *)resp->data; 495 bcopy(&sc->embed_counter[index], embed, sizeof(*embed)); 496 497 break; 498 } 499 default: 500 error = EINVAL; 501 break; 502 } 503 break; 504 case NGM_ETHER_COOKIE: 505 if (!(msg->header.flags & NGF_RESP)) { 506 error = EINVAL; 507 break; 508 } 509 switch (msg->header.cmd) { 510 case NGM_ETHER_GET_IFNAME: 511 { 512 char *ifname = (char *)msg->data; 513 514 if (msg->header.arglen < 2) { 515 error = EINVAL; 516 break; 517 } 518 519 if (ng_source_store_output_ifp(sc, ifname) == 0) 520 ng_source_set_autosrc(sc, 0); 521 break; 522 } 523 default: 524 error = EINVAL; 525 } 526 break; 527 default: 528 error = EINVAL; 529 break; 530 } 531 532 done: 533 /* Take care of synchronous response, if any. */ 534 NG_RESPOND_MSG(error, node, item, resp); 535 /* Free the message and return. */ 536 NG_FREE_MSG(msg); 537 return (error); 538 } 539 540 /* 541 * Receive data on a hook 542 * 543 * If data comes in the input hook, enqueue it on the send queue. 544 * If data comes in the output hook, discard it. 545 */ 546 static int 547 ng_source_rcvdata(hook_p hook, item_p item) 548 { 549 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 550 struct mbuf *m; 551 int error = 0; 552 553 NGI_GET_M(item, m); 554 NG_FREE_ITEM(item); 555 556 /* Which hook? */ 557 if (hook == sc->output) { 558 /* discard */ 559 NG_FREE_M(m); 560 return (error); 561 } 562 KASSERT(hook == sc->input, ("%s: no hook!", __func__)); 563 564 /* Enqueue packet. */ 565 /* XXX should we check IF_QFULL() ? */ 566 _IF_ENQUEUE(&sc->snd_queue, m); 567 sc->queueOctets += m->m_pkthdr.len; 568 sc->last_packet = m; 569 570 return (0); 571 } 572 573 /* 574 * Shutdown processing 575 */ 576 static int 577 ng_source_rmnode(node_p node) 578 { 579 sc_p sc = NG_NODE_PRIVATE(node); 580 581 ng_source_stop(sc); 582 ng_source_clr_data(sc); 583 NG_NODE_SET_PRIVATE(node, NULL); 584 NG_NODE_UNREF(node); 585 kfree(sc, M_NETGRAPH); 586 587 return (0); 588 } 589 590 /* 591 * Hook disconnection 592 */ 593 static int 594 ng_source_disconnect(hook_p hook) 595 { 596 sc_p sc; 597 598 sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 599 KASSERT(sc != NULL, ("%s: null node private", __func__)); 600 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output) 601 ng_rmnode_self(NG_HOOK_NODE(hook)); 602 return (0); 603 } 604 605 /* 606 * Set sc->output_ifp to point to the the struct ifnet of the interface 607 * reached via our output hook. 608 */ 609 static int 610 ng_source_store_output_ifp(sc_p sc, char *ifname) 611 { 612 struct ifnet *ifp; 613 int s; 614 615 ifp = ifunit(ifname); 616 617 if (ifp == NULL) { 618 printf("%s: can't find interface %d\n", __func__, if_index); 619 return (EINVAL); 620 } 621 sc->output_ifp = ifp; 622 623 #if 1 624 /* XXX mucking with a drivers ifqueue size is ugly but we need it 625 * to queue a lot of packets to get close to line rate on a gigabit 626 * interface with small packets. 627 * XXX we should restore the original value at stop or disconnect 628 */ 629 s = splimp(); /* XXX is this required? */ 630 if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) { 631 printf("ng_source: changing ifq_maxlen from %d to %d\n", 632 ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN); 633 ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN; 634 } 635 splx(s); 636 #endif 637 return (0); 638 } 639 640 /* 641 * Set the attached ethernet node's ethernet source address override flag. 642 */ 643 static int 644 ng_source_set_autosrc(sc_p sc, uint32_t flag) 645 { 646 struct ng_mesg *msg; 647 int error = 0; 648 649 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC, 650 sizeof (uint32_t), M_WAITOK | M_NULLOK); 651 if (msg == NULL) 652 return(ENOBUFS); 653 654 *(uint32_t *)msg->data = flag; 655 NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0); 656 return (error); 657 } 658 659 /* 660 * Clear out the data we've queued 661 */ 662 static void 663 ng_source_clr_data (sc_p sc) 664 { 665 struct mbuf *m; 666 667 for (;;) { 668 _IF_DEQUEUE(&sc->snd_queue, m); 669 if (m == NULL) 670 break; 671 NG_FREE_M(m); 672 } 673 sc->queueOctets = 0; 674 sc->last_packet = NULL; 675 } 676 677 /* 678 * Start sending queued data out the output hook 679 */ 680 static int 681 ng_source_start(sc_p sc, uint64_t packets) 682 { 683 if (sc->output_ifp == NULL) { 684 printf("ng_source: start without iface configured\n"); 685 return (ENXIO); 686 } 687 688 if (sc->node->nd_flags & NG_SOURCE_ACTIVE) 689 return (EBUSY); 690 691 sc->node->nd_flags |= NG_SOURCE_ACTIVE; 692 693 sc->packets = packets; 694 timevalclear(&sc->stats.elapsedTime); 695 timevalclear(&sc->stats.endTime); 696 getmicrotime(&sc->stats.startTime); 697 getmicrotime(&sc->stats.lastTime); 698 ng_callout(&sc->intr_ch, sc->node, NULL, 0, 699 ng_source_intr, sc, 0); 700 701 return (0); 702 } 703 704 /* 705 * Stop sending queued data out the output hook 706 */ 707 static void 708 ng_source_stop(sc_p sc) 709 { 710 ng_uncallout(&sc->intr_ch, sc->node); 711 sc->node->nd_flags &= ~NG_SOURCE_ACTIVE; 712 getmicrotime(&sc->stats.endTime); 713 sc->stats.elapsedTime = sc->stats.endTime; 714 timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime); 715 } 716 717 /* 718 * While active called every NG_SOURCE_INTR_TICKS ticks. 719 * Sends as many packets as the interface connected to our 720 * output hook is able to enqueue. 721 */ 722 static void 723 ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2) 724 { 725 sc_p sc = (sc_p)arg1; 726 struct ifqueue *ifq; 727 int packets; 728 729 KASSERT(sc != NULL, ("%s: null node private", __func__)); 730 731 if (sc->packets == 0 || sc->output == NULL 732 || (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) { 733 ng_source_stop(sc); 734 return; 735 } 736 737 if (sc->output_ifp != NULL) { 738 ifq = (struct ifqueue *)&sc->output_ifp->if_snd; 739 packets = ifq->ifq_maxlen - ifq->ifq_len; 740 } else 741 packets = sc->snd_queue.ifq_len; 742 743 if (sc->stats.maxPps != 0) { 744 struct timeval now, elapsed; 745 uint64_t usec; 746 int maxpkt; 747 748 getmicrotime(&now); 749 elapsed = now; 750 timevalsub(&elapsed, &sc->stats.lastTime); 751 usec = elapsed.tv_sec * 1000000 + elapsed.tv_usec; 752 maxpkt = (uint64_t)sc->stats.maxPps * usec / 1000000; 753 sc->stats.lastTime = now; 754 if (packets > maxpkt) 755 packets = maxpkt; 756 } 757 758 ng_source_send(sc, packets, NULL); 759 if (sc->packets == 0) 760 ng_source_stop(sc); 761 else 762 ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS, 763 ng_source_intr, sc, 0); 764 } 765 766 /* 767 * Send packets out our output hook. 768 */ 769 static int 770 ng_source_send(sc_p sc, int tosend, int *sent_p) 771 { 772 struct mbuf *m, *m2; 773 int sent; 774 int error = 0; 775 776 KASSERT(tosend >= 0, ("%s: negative tosend param", __func__)); 777 KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE, 778 ("%s: inactive node", __func__)); 779 780 if ((uint64_t)tosend > sc->packets) 781 tosend = sc->packets; 782 783 /* Go through the queue sending packets one by one. */ 784 for (sent = 0; error == 0 && sent < tosend; ++sent) { 785 _IF_DEQUEUE(&sc->snd_queue, m); 786 if (m == NULL) 787 break; 788 789 /* Duplicate and modify the packet. */ 790 error = ng_source_dup_mod(sc, m, &m2); 791 if (error) { 792 if (error == ENOBUFS) 793 _IF_PREPEND(&sc->snd_queue, m); 794 else 795 _IF_ENQUEUE(&sc->snd_queue, m); 796 break; 797 } 798 799 /* Re-enqueue the original packet for us. */ 800 _IF_ENQUEUE(&sc->snd_queue, m); 801 802 sc->stats.outFrames++; 803 sc->stats.outOctets += m2->m_pkthdr.len; 804 NG_SEND_DATA_ONLY(error, sc->output, m2); 805 if (error) 806 break; 807 } 808 809 sc->packets -= sent; 810 if (sent_p != NULL) 811 *sent_p = sent; 812 return (error); 813 } 814 815 /* 816 * Modify packet in 'm' by changing 'len' bytes starting at 'offset' 817 * to data in 'cp'. 818 * 819 * The packet data in 'm' must be in a contiguous buffer in a single mbuf. 820 */ 821 static void 822 ng_source_packet_mod(sc_p sc, struct mbuf *m, int offset, int len, caddr_t cp, 823 int flags) 824 { 825 if (len == 0) 826 return; 827 828 /* Can't modify beyond end of packet. */ 829 /* TODO: Pad packet for this case. */ 830 if (offset + len > m->m_len) 831 return; 832 833 bcopy(cp, mtod_off(m, offset, caddr_t), len); 834 } 835 836 static void 837 ng_source_mod_counter(sc_p sc, struct ng_source_embed_cnt_info *cnt, 838 struct mbuf *m, int increment) 839 { 840 caddr_t cp; 841 uint32_t val; 842 843 val = htonl(cnt->next_val); 844 cp = (caddr_t)&val + sizeof(val) - cnt->width; 845 ng_source_packet_mod(sc, m, cnt->offset, cnt->width, cp, cnt->flags); 846 847 if (increment) { 848 cnt->next_val += increment; 849 850 if (increment > 0 && cnt->next_val > cnt->max_val) { 851 cnt->next_val = cnt->min_val - 1 + 852 (cnt->next_val - cnt->max_val); 853 if (cnt->next_val > cnt->max_val) 854 cnt->next_val = cnt->max_val; 855 } else if (increment < 0 && cnt->next_val < cnt->min_val) { 856 cnt->next_val = cnt->max_val + 1 + 857 (cnt->next_val - cnt->min_val); 858 if (cnt->next_val < cnt->min_val) 859 cnt->next_val = cnt->max_val; 860 } 861 } 862 } 863 864 static int 865 ng_source_dup_mod(sc_p sc, struct mbuf *m0, struct mbuf **m_ptr) 866 { 867 struct mbuf *m; 868 struct ng_source_embed_cnt_info *cnt; 869 struct ng_source_embed_info *ts; 870 int modify; 871 int error = 0; 872 int i, increment; 873 874 /* Are we going to modify packets? */ 875 modify = sc->embed_timestamp.flags & NGM_SOURCE_EMBED_ENABLE; 876 for (i = 0; !modify && i < NG_SOURCE_COUNTERS; ++i) 877 modify = sc->embed_counter[i].flags & NGM_SOURCE_EMBED_ENABLE; 878 879 /* Duplicate the packet. */ 880 if (modify) 881 m = m_dup(m0, MB_DONTWAIT); 882 else 883 m = m_copypacket(m0, MB_DONTWAIT); 884 if (m == NULL) { 885 error = ENOBUFS; 886 goto done; 887 } 888 *m_ptr = m; 889 890 if (!modify) 891 goto done; 892 893 /* Modify the copied packet for sending. */ 894 KASSERT(M_WRITABLE(m), ("%s: packet not writable", __func__)); 895 896 for (i = 0; i < NG_SOURCE_COUNTERS; ++i) { 897 cnt = &sc->embed_counter[i]; 898 if (cnt->flags & NGM_SOURCE_EMBED_ENABLE) { 899 if ((cnt->flags & NGM_SOURCE_INC_CNT_PER_LIST) == 0 || 900 sc->last_packet == m0) 901 increment = cnt->increment; 902 else 903 increment = 0; 904 ng_source_mod_counter(sc, cnt, m, increment); 905 } 906 } 907 908 ts = &sc->embed_timestamp; 909 if (ts->flags & NGM_SOURCE_EMBED_ENABLE) { 910 struct timeval now; 911 getmicrotime(&now); 912 now.tv_sec = htonl(now.tv_sec); 913 now.tv_usec = htonl(now.tv_usec); 914 ng_source_packet_mod(sc, m, ts->offset, sizeof (now), 915 (caddr_t)&now, ts->flags); 916 } 917 918 done: 919 return(error); 920 } 921