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 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 /* 45 * This node is used for high speed packet geneneration. It queues 46 * all data received 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 #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 mbufq 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 #ifdef __i386__ 129 { "tv_sec", &ng_parse_int32_type }, 130 #else 131 { "tv_sec", &ng_parse_int64_type }, 132 #endif 133 #ifdef __LP64__ 134 { "tv_usec", &ng_parse_int64_type }, 135 #else 136 { "tv_usec", &ng_parse_int32_type }, 137 #endif 138 { NULL } 139 }; 140 const struct ng_parse_type ng_source_timeval_type = { 141 &ng_parse_struct_type, 142 &ng_source_timeval_type_fields 143 }; 144 145 /* Parse type for struct ng_source_stats */ 146 static const struct ng_parse_struct_field ng_source_stats_type_fields[] 147 = NG_SOURCE_STATS_TYPE_INFO; 148 static const struct ng_parse_type ng_source_stats_type = { 149 &ng_parse_struct_type, 150 &ng_source_stats_type_fields 151 }; 152 153 /* Parse type for struct ng_source_embed_info */ 154 static const struct ng_parse_struct_field ng_source_embed_type_fields[] = 155 NG_SOURCE_EMBED_TYPE_INFO; 156 static const struct ng_parse_type ng_source_embed_type = { 157 &ng_parse_struct_type, 158 &ng_source_embed_type_fields 159 }; 160 161 /* Parse type for struct ng_source_embed_cnt_info */ 162 static const struct ng_parse_struct_field ng_source_embed_cnt_type_fields[] = 163 NG_SOURCE_EMBED_CNT_TYPE_INFO; 164 static const struct ng_parse_type ng_source_embed_cnt_type = { 165 &ng_parse_struct_type, 166 &ng_source_embed_cnt_type_fields 167 }; 168 169 /* List of commands and how to convert arguments to/from ASCII */ 170 static const struct ng_cmdlist ng_source_cmds[] = { 171 { 172 NGM_SOURCE_COOKIE, 173 NGM_SOURCE_GET_STATS, 174 "getstats", 175 NULL, 176 &ng_source_stats_type 177 }, 178 { 179 NGM_SOURCE_COOKIE, 180 NGM_SOURCE_CLR_STATS, 181 "clrstats", 182 NULL, 183 NULL 184 }, 185 { 186 NGM_SOURCE_COOKIE, 187 NGM_SOURCE_GETCLR_STATS, 188 "getclrstats", 189 NULL, 190 &ng_source_stats_type 191 }, 192 { 193 NGM_SOURCE_COOKIE, 194 NGM_SOURCE_START, 195 "start", 196 &ng_parse_uint64_type, 197 NULL 198 }, 199 { 200 NGM_SOURCE_COOKIE, 201 NGM_SOURCE_STOP, 202 "stop", 203 NULL, 204 NULL 205 }, 206 { 207 NGM_SOURCE_COOKIE, 208 NGM_SOURCE_CLR_DATA, 209 "clrdata", 210 NULL, 211 NULL 212 }, 213 { 214 NGM_SOURCE_COOKIE, 215 NGM_SOURCE_SETIFACE, 216 "setiface", 217 &ng_parse_string_type, 218 NULL 219 }, 220 { 221 NGM_SOURCE_COOKIE, 222 NGM_SOURCE_SETPPS, 223 "setpps", 224 &ng_parse_uint32_type, 225 NULL 226 }, 227 { 228 NGM_SOURCE_COOKIE, 229 NGM_SOURCE_SET_TIMESTAMP, 230 "settimestamp", 231 &ng_source_embed_type, 232 NULL 233 }, 234 { 235 NGM_SOURCE_COOKIE, 236 NGM_SOURCE_GET_TIMESTAMP, 237 "gettimestamp", 238 NULL, 239 &ng_source_embed_type 240 }, 241 { 242 NGM_SOURCE_COOKIE, 243 NGM_SOURCE_SET_COUNTER, 244 "setcounter", 245 &ng_source_embed_cnt_type, 246 NULL 247 }, 248 { 249 NGM_SOURCE_COOKIE, 250 NGM_SOURCE_GET_COUNTER, 251 "getcounter", 252 &ng_parse_uint8_type, 253 &ng_source_embed_cnt_type 254 }, 255 { 0 } 256 }; 257 258 /* Netgraph type descriptor */ 259 static struct ng_type ng_source_typestruct = { 260 .version = NG_ABI_VERSION, 261 .name = NG_SOURCE_NODE_TYPE, 262 .constructor = ng_source_constructor, 263 .rcvmsg = ng_source_rcvmsg, 264 .shutdown = ng_source_rmnode, 265 .newhook = ng_source_newhook, 266 .connect = ng_source_connect, 267 .rcvdata = ng_source_rcvdata, 268 .disconnect = ng_source_disconnect, 269 .cmdlist = ng_source_cmds, 270 }; 271 NETGRAPH_INIT(source, &ng_source_typestruct); 272 273 static int ng_source_set_autosrc(sc_p, uint32_t); 274 275 /* 276 * Node constructor 277 */ 278 static int 279 ng_source_constructor(node_p node) 280 { 281 sc_p sc; 282 283 sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO); 284 285 NG_NODE_SET_PRIVATE(node, sc); 286 sc->node = node; 287 mbufq_init(&sc->snd_queue, 2048); 288 ng_callout_init(&sc->intr_ch); 289 290 return (0); 291 } 292 293 /* 294 * Add a hook 295 */ 296 static int 297 ng_source_newhook(node_p node, hook_p hook, const char *name) 298 { 299 sc_p sc = NG_NODE_PRIVATE(node); 300 301 if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) { 302 sc->input = hook; 303 } else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) { 304 sc->output = hook; 305 sc->output_ifp = NULL; 306 bzero(&sc->stats, sizeof(sc->stats)); 307 } else 308 return (EINVAL); 309 310 return (0); 311 } 312 313 /* 314 * Hook has been added 315 */ 316 static int 317 ng_source_connect(hook_p hook) 318 { 319 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 320 struct ng_mesg *msg; 321 int dummy_error = 0; 322 323 /* 324 * If this is "output" hook, then request information 325 * from our downstream. 326 */ 327 if (hook == sc->output) { 328 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME, 329 0, M_NOWAIT); 330 if (msg == NULL) 331 return (ENOBUFS); 332 333 /* 334 * Our hook and peer hook have HK_INVALID flag set, 335 * so we can't use NG_SEND_MSG_HOOK() macro here. 336 */ 337 NG_SEND_MSG_ID(dummy_error, sc->node, msg, 338 NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node)); 339 } 340 341 return (0); 342 } 343 344 /* 345 * Receive a control message 346 */ 347 static int 348 ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook) 349 { 350 sc_p sc = NG_NODE_PRIVATE(node); 351 struct ng_mesg *msg, *resp = NULL; 352 int error = 0; 353 354 NGI_GET_MSG(item, msg); 355 356 switch (msg->header.typecookie) { 357 case NGM_SOURCE_COOKIE: 358 if (msg->header.flags & NGF_RESP) { 359 error = EINVAL; 360 break; 361 } 362 switch (msg->header.cmd) { 363 case NGM_SOURCE_GET_STATS: 364 case NGM_SOURCE_CLR_STATS: 365 case NGM_SOURCE_GETCLR_STATS: 366 { 367 struct ng_source_stats *stats; 368 369 if (msg->header.cmd != NGM_SOURCE_CLR_STATS) { 370 NG_MKRESPONSE(resp, msg, 371 sizeof(*stats), M_NOWAIT); 372 if (resp == NULL) { 373 error = ENOMEM; 374 goto done; 375 } 376 sc->stats.queueOctets = sc->queueOctets; 377 sc->stats.queueFrames = mbufq_len(&sc->snd_queue); 378 if ((sc->node->nd_flags & NG_SOURCE_ACTIVE) 379 && !timevalisset(&sc->stats.endTime)) { 380 getmicrotime(&sc->stats.elapsedTime); 381 timevalsub(&sc->stats.elapsedTime, 382 &sc->stats.startTime); 383 } 384 stats = (struct ng_source_stats *)resp->data; 385 bcopy(&sc->stats, stats, sizeof(* stats)); 386 } 387 if (msg->header.cmd != NGM_SOURCE_GET_STATS) 388 bzero(&sc->stats, sizeof(sc->stats)); 389 } 390 break; 391 case NGM_SOURCE_START: 392 { 393 uint64_t packets; 394 395 if (msg->header.arglen != sizeof(uint64_t)) { 396 error = EINVAL; 397 break; 398 } 399 400 packets = *(uint64_t *)msg->data; 401 402 error = ng_source_start(sc, packets); 403 404 break; 405 } 406 case NGM_SOURCE_STOP: 407 ng_source_stop(sc); 408 break; 409 case NGM_SOURCE_CLR_DATA: 410 ng_source_clr_data(sc); 411 break; 412 case NGM_SOURCE_SETIFACE: 413 { 414 char *ifname = (char *)msg->data; 415 416 if (msg->header.arglen < 2) { 417 error = EINVAL; 418 break; 419 } 420 421 ng_source_store_output_ifp(sc, ifname); 422 break; 423 } 424 case NGM_SOURCE_SETPPS: 425 { 426 uint32_t pps; 427 428 if (msg->header.arglen != sizeof(uint32_t)) { 429 error = EINVAL; 430 break; 431 } 432 433 pps = *(uint32_t *)msg->data; 434 435 sc->stats.maxPps = pps; 436 437 break; 438 } 439 case NGM_SOURCE_SET_TIMESTAMP: 440 { 441 struct ng_source_embed_info *embed; 442 443 if (msg->header.arglen != sizeof(*embed)) { 444 error = EINVAL; 445 goto done; 446 } 447 embed = (struct ng_source_embed_info *)msg->data; 448 bcopy(embed, &sc->embed_timestamp, sizeof(*embed)); 449 450 break; 451 } 452 case NGM_SOURCE_GET_TIMESTAMP: 453 { 454 struct ng_source_embed_info *embed; 455 456 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_NOWAIT); 457 if (resp == NULL) { 458 error = ENOMEM; 459 goto done; 460 } 461 embed = (struct ng_source_embed_info *)resp->data; 462 bcopy(&sc->embed_timestamp, embed, sizeof(*embed)); 463 464 break; 465 } 466 case NGM_SOURCE_SET_COUNTER: 467 { 468 struct ng_source_embed_cnt_info *embed; 469 470 if (msg->header.arglen != sizeof(*embed)) { 471 error = EINVAL; 472 goto done; 473 } 474 embed = (struct ng_source_embed_cnt_info *)msg->data; 475 if (embed->index >= NG_SOURCE_COUNTERS || 476 !(embed->width == 1 || embed->width == 2 || 477 embed->width == 4)) { 478 error = EINVAL; 479 goto done; 480 } 481 bcopy(embed, &sc->embed_counter[embed->index], 482 sizeof(*embed)); 483 484 break; 485 } 486 case NGM_SOURCE_GET_COUNTER: 487 { 488 uint8_t index = *(uint8_t *)msg->data; 489 struct ng_source_embed_cnt_info *embed; 490 491 if (index >= NG_SOURCE_COUNTERS) { 492 error = EINVAL; 493 goto done; 494 } 495 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_NOWAIT); 496 if (resp == NULL) { 497 error = ENOMEM; 498 goto done; 499 } 500 embed = (struct ng_source_embed_cnt_info *)resp->data; 501 bcopy(&sc->embed_counter[index], embed, sizeof(*embed)); 502 503 break; 504 } 505 default: 506 error = EINVAL; 507 break; 508 } 509 break; 510 case NGM_ETHER_COOKIE: 511 if (!(msg->header.flags & NGF_RESP)) { 512 error = EINVAL; 513 break; 514 } 515 switch (msg->header.cmd) { 516 case NGM_ETHER_GET_IFNAME: 517 { 518 char *ifname = (char *)msg->data; 519 520 if (msg->header.arglen < 2) { 521 error = EINVAL; 522 break; 523 } 524 525 if (ng_source_store_output_ifp(sc, ifname) == 0) 526 ng_source_set_autosrc(sc, 0); 527 break; 528 } 529 default: 530 error = EINVAL; 531 } 532 break; 533 default: 534 error = EINVAL; 535 break; 536 } 537 538 done: 539 /* Take care of synchronous response, if any. */ 540 NG_RESPOND_MSG(error, node, item, resp); 541 /* Free the message and return. */ 542 NG_FREE_MSG(msg); 543 return (error); 544 } 545 546 /* 547 * Receive data on a hook 548 * 549 * If data comes in the input hook, enqueue it on the send queue. 550 * If data comes in the output hook, discard it. 551 */ 552 static int 553 ng_source_rcvdata(hook_p hook, item_p item) 554 { 555 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 556 struct mbuf *m; 557 int error = 0; 558 559 NGI_GET_M(item, m); 560 NG_FREE_ITEM(item); 561 562 /* Which hook? */ 563 if (hook == sc->output) { 564 /* discard */ 565 NG_FREE_M(m); 566 return (error); 567 } 568 KASSERT(hook == sc->input, ("%s: no hook!", __func__)); 569 570 /* Enqueue packet if the queue isn't full. */ 571 error = mbufq_enqueue(&sc->snd_queue, m); 572 if (error) { 573 NG_FREE_M(m); 574 return (error); 575 } 576 sc->queueOctets += m->m_pkthdr.len; 577 sc->last_packet = m; 578 579 return (0); 580 } 581 582 /* 583 * Shutdown processing 584 */ 585 static int 586 ng_source_rmnode(node_p node) 587 { 588 sc_p sc = NG_NODE_PRIVATE(node); 589 590 ng_source_stop(sc); 591 ng_source_clr_data(sc); 592 NG_NODE_SET_PRIVATE(node, NULL); 593 NG_NODE_UNREF(node); 594 free(sc, M_NETGRAPH); 595 596 return (0); 597 } 598 599 /* 600 * Hook disconnection 601 */ 602 static int 603 ng_source_disconnect(hook_p hook) 604 { 605 sc_p sc; 606 607 sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 608 KASSERT(sc != NULL, ("%s: null node private", __func__)); 609 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output) 610 ng_rmnode_self(NG_HOOK_NODE(hook)); 611 return (0); 612 } 613 614 /* 615 * Set sc->output_ifp to point to the struct ifnet of the interface 616 * reached via our output hook. 617 */ 618 static int 619 ng_source_store_output_ifp(sc_p sc, char *ifname) 620 { 621 struct ifnet *ifp; 622 623 ifp = ifunit(ifname); 624 625 if (ifp == NULL) { 626 printf("%s: can't find interface %s\n", __func__, ifname); 627 return (EINVAL); 628 } 629 sc->output_ifp = ifp; 630 631 #if 1 632 /* XXX mucking with a drivers ifqueue size is ugly but we need it 633 * to queue a lot of packets to get close to line rate on a gigabit 634 * interface with small packets. 635 * XXX we should restore the original value at stop or disconnect 636 */ 637 if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) { 638 printf("ng_source: changing ifq_maxlen from %d to %d\n", 639 ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN); 640 ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN; 641 } 642 #endif 643 return (0); 644 } 645 646 /* 647 * Set the attached ethernet node's ethernet source address override flag. 648 */ 649 static int 650 ng_source_set_autosrc(sc_p sc, uint32_t flag) 651 { 652 struct ng_mesg *msg; 653 int error = 0; 654 655 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC, 656 sizeof (uint32_t), M_NOWAIT); 657 if (msg == NULL) 658 return(ENOBUFS); 659 660 *(uint32_t *)msg->data = flag; 661 NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0); 662 return (error); 663 } 664 665 /* 666 * Clear out the data we've queued 667 */ 668 static void 669 ng_source_clr_data (sc_p sc) 670 { 671 struct mbuf *m; 672 673 for (;;) { 674 m = mbufq_dequeue(&sc->snd_queue); 675 if (m == NULL) 676 break; 677 NG_FREE_M(m); 678 } 679 sc->queueOctets = 0; 680 sc->last_packet = NULL; 681 } 682 683 /* 684 * Start sending queued data out the output hook 685 */ 686 static int 687 ng_source_start(sc_p sc, uint64_t packets) 688 { 689 if (sc->output_ifp == NULL && sc->stats.maxPps == 0) { 690 printf("ng_source: start without iface or pps configured\n"); 691 return (ENXIO); 692 } 693 694 if (sc->node->nd_flags & NG_SOURCE_ACTIVE) 695 return (EBUSY); 696 697 sc->node->nd_flags |= NG_SOURCE_ACTIVE; 698 699 sc->packets = packets; 700 timevalclear(&sc->stats.elapsedTime); 701 timevalclear(&sc->stats.endTime); 702 getmicrotime(&sc->stats.startTime); 703 getmicrotime(&sc->stats.lastTime); 704 ng_callout(&sc->intr_ch, sc->node, NULL, 0, 705 ng_source_intr, sc, 0); 706 707 return (0); 708 } 709 710 /* 711 * Stop sending queued data out the output hook 712 */ 713 static void 714 ng_source_stop(sc_p sc) 715 { 716 ng_uncallout(&sc->intr_ch, sc->node); 717 sc->node->nd_flags &= ~NG_SOURCE_ACTIVE; 718 getmicrotime(&sc->stats.endTime); 719 sc->stats.elapsedTime = sc->stats.endTime; 720 timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime); 721 } 722 723 /* 724 * While active called every NG_SOURCE_INTR_TICKS ticks. 725 * Sends as many packets as the interface connected to our 726 * output hook is able to enqueue. 727 */ 728 static void 729 ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2) 730 { 731 sc_p sc = (sc_p)arg1; 732 struct ifqueue *ifq; 733 int packets; 734 735 KASSERT(sc != NULL, ("%s: null node private", __func__)); 736 737 if (sc->packets == 0 || sc->output == NULL 738 || (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) { 739 ng_source_stop(sc); 740 return; 741 } 742 743 if (sc->output_ifp != NULL) { 744 ifq = (struct ifqueue *)&sc->output_ifp->if_snd; 745 packets = ifq->ifq_maxlen - ifq->ifq_len; 746 } else 747 packets = mbufq_len(&sc->snd_queue); 748 749 if (sc->stats.maxPps != 0) { 750 struct timeval now, elapsed; 751 uint64_t usec; 752 int maxpkt; 753 754 getmicrotime(&now); 755 elapsed = now; 756 timevalsub(&elapsed, &sc->stats.lastTime); 757 usec = elapsed.tv_sec * 1000000 + elapsed.tv_usec; 758 maxpkt = (uint64_t)sc->stats.maxPps * usec / 1000000; 759 sc->stats.lastTime = now; 760 if (packets > maxpkt) 761 packets = maxpkt; 762 } 763 764 ng_source_send(sc, packets, NULL); 765 if (sc->packets == 0) 766 ng_source_stop(sc); 767 else 768 ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS, 769 ng_source_intr, sc, 0); 770 } 771 772 /* 773 * Send packets out our output hook. 774 */ 775 static int 776 ng_source_send(sc_p sc, int tosend, int *sent_p) 777 { 778 struct mbuf *m, *m2; 779 int sent; 780 int error = 0; 781 782 KASSERT(tosend >= 0, ("%s: negative tosend param", __func__)); 783 KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE, 784 ("%s: inactive node", __func__)); 785 786 if ((uint64_t)tosend > sc->packets) 787 tosend = sc->packets; 788 789 /* Go through the queue sending packets one by one. */ 790 for (sent = 0; error == 0 && sent < tosend; ++sent) { 791 m = mbufq_dequeue(&sc->snd_queue); 792 if (m == NULL) 793 break; 794 795 /* Duplicate and modify the packet. */ 796 error = ng_source_dup_mod(sc, m, &m2); 797 if (error) { 798 if (error == ENOBUFS) 799 mbufq_prepend(&sc->snd_queue, m); 800 else 801 (void)mbufq_enqueue(&sc->snd_queue, m); 802 break; 803 } 804 805 /* 806 * Re-enqueue the original packet for us. The queue 807 * has a free slot, because we dequeued the packet 808 * above and this callout function runs under WRITER 809 * lock. 810 */ 811 error = mbufq_enqueue(&sc->snd_queue, m); 812 KASSERT(error == 0, ("%s: re-enqueue packet failed", __func__)); 813 814 sc->stats.outFrames++; 815 sc->stats.outOctets += m2->m_pkthdr.len; 816 NG_SEND_DATA_ONLY(error, sc->output, m2); 817 if (error) 818 break; 819 } 820 821 sc->packets -= sent; 822 if (sent_p != NULL) 823 *sent_p = sent; 824 return (error); 825 } 826 827 /* 828 * Modify packet in 'm' by changing 'len' bytes starting at 'offset' 829 * to data in 'cp'. 830 * 831 * The packet data in 'm' must be in a contiguous buffer in a single mbuf. 832 */ 833 static void 834 ng_source_packet_mod(sc_p sc, struct mbuf *m, int offset, int len, caddr_t cp, 835 int flags) 836 { 837 if (len == 0) 838 return; 839 840 /* Can't modify beyond end of packet. */ 841 /* TODO: Pad packet for this case. */ 842 if (offset + len > m->m_len) 843 return; 844 845 bcopy(cp, mtod_off(m, offset, caddr_t), len); 846 } 847 848 static void 849 ng_source_mod_counter(sc_p sc, struct ng_source_embed_cnt_info *cnt, 850 struct mbuf *m, int increment) 851 { 852 caddr_t cp; 853 uint32_t val; 854 855 val = htonl(cnt->next_val); 856 cp = (caddr_t)&val + sizeof(val) - cnt->width; 857 ng_source_packet_mod(sc, m, cnt->offset, cnt->width, cp, cnt->flags); 858 859 if (increment) { 860 cnt->next_val += increment; 861 862 if (increment > 0 && cnt->next_val > cnt->max_val) { 863 cnt->next_val = cnt->min_val - 1 + 864 (cnt->next_val - cnt->max_val); 865 if (cnt->next_val > cnt->max_val) 866 cnt->next_val = cnt->max_val; 867 } else if (increment < 0 && cnt->next_val < cnt->min_val) { 868 cnt->next_val = cnt->max_val + 1 + 869 (cnt->next_val - cnt->min_val); 870 if (cnt->next_val < cnt->min_val) 871 cnt->next_val = cnt->max_val; 872 } 873 } 874 } 875 876 static int 877 ng_source_dup_mod(sc_p sc, struct mbuf *m0, struct mbuf **m_ptr) 878 { 879 struct mbuf *m; 880 struct ng_source_embed_cnt_info *cnt; 881 struct ng_source_embed_info *ts; 882 int modify; 883 int error = 0; 884 int i, increment; 885 886 /* Are we going to modify packets? */ 887 modify = sc->embed_timestamp.flags & NGM_SOURCE_EMBED_ENABLE; 888 for (i = 0; !modify && i < NG_SOURCE_COUNTERS; ++i) 889 modify = sc->embed_counter[i].flags & NGM_SOURCE_EMBED_ENABLE; 890 891 /* Duplicate the packet. */ 892 if (modify) 893 m = m_dup(m0, M_NOWAIT); 894 else 895 m = m_copypacket(m0, M_NOWAIT); 896 if (m == NULL) { 897 error = ENOBUFS; 898 goto done; 899 } 900 *m_ptr = m; 901 902 if (!modify) 903 goto done; 904 905 /* Modify the copied packet for sending. */ 906 KASSERT(M_WRITABLE(m), ("%s: packet not writable", __func__)); 907 908 for (i = 0; i < NG_SOURCE_COUNTERS; ++i) { 909 cnt = &sc->embed_counter[i]; 910 if (cnt->flags & NGM_SOURCE_EMBED_ENABLE) { 911 if ((cnt->flags & NGM_SOURCE_INC_CNT_PER_LIST) == 0 || 912 sc->last_packet == m0) 913 increment = cnt->increment; 914 else 915 increment = 0; 916 ng_source_mod_counter(sc, cnt, m, increment); 917 } 918 } 919 920 ts = &sc->embed_timestamp; 921 if (ts->flags & NGM_SOURCE_EMBED_ENABLE) { 922 struct timeval now; 923 getmicrotime(&now); 924 now.tv_sec = htonl(now.tv_sec); 925 now.tv_usec = htonl(now.tv_usec); 926 ng_source_packet_mod(sc, m, ts->offset, sizeof (now), 927 (caddr_t)&now, ts->flags); 928 } 929 930 done: 931 return(error); 932 } 933