ng_source.c revision 243882
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: head/sys/netgraph/ng_source.c 243882 2012-12-05 08:04:20Z 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#define mtod_off(m,off,t) ((t)(mtod((m),caddr_t)+(off))) 81 82/* Per node info */ 83struct 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}; 97typedef struct privdata *sc_p; 98 99/* Node flags */ 100#define NG_SOURCE_ACTIVE (NGF_TYPE1) 101 102/* Netgraph methods */ 103static ng_constructor_t ng_source_constructor; 104static ng_rcvmsg_t ng_source_rcvmsg; 105static ng_shutdown_t ng_source_rmnode; 106static ng_newhook_t ng_source_newhook; 107static ng_connect_t ng_source_connect; 108static ng_rcvdata_t ng_source_rcvdata; 109static ng_disconnect_t ng_source_disconnect; 110 111/* Other functions */ 112static void ng_source_intr(node_p, hook_p, void *, int); 113static void ng_source_clr_data (sc_p); 114static int ng_source_start (sc_p, uint64_t); 115static void ng_source_stop (sc_p); 116static int ng_source_send (sc_p, int, int *); 117static int ng_source_store_output_ifp(sc_p, char *); 118static void ng_source_packet_mod(sc_p, struct mbuf *, 119 int, int, caddr_t, int); 120static void ng_source_mod_counter(sc_p sc, 121 struct ng_source_embed_cnt_info *cnt, 122 struct mbuf *m, int increment); 123static int ng_source_dup_mod(sc_p, struct mbuf *, 124 struct mbuf **); 125 126/* Parse type for timeval */ 127static 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}; 132const 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 */ 138static const struct ng_parse_struct_field ng_source_stats_type_fields[] 139 = NG_SOURCE_STATS_TYPE_INFO; 140static 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 */ 146static const struct ng_parse_struct_field ng_source_embed_type_fields[] = 147 NG_SOURCE_EMBED_TYPE_INFO; 148static 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 */ 154static const struct ng_parse_struct_field ng_source_embed_cnt_type_fields[] = 155 NG_SOURCE_EMBED_CNT_TYPE_INFO; 156static 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 */ 162static 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 */ 251static 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}; 263NETGRAPH_INIT(source, &ng_source_typestruct); 264 265static int ng_source_set_autosrc(sc_p, uint32_t); 266 267/* 268 * Node constructor 269 */ 270static int 271ng_source_constructor(node_p node) 272{ 273 sc_p sc; 274 275 sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO); 276 277 NG_NODE_SET_PRIVATE(node, sc); 278 sc->node = node; 279 sc->snd_queue.ifq_maxlen = 2048; /* XXX not checked */ 280 ng_callout_init(&sc->intr_ch); 281 282 return (0); 283} 284 285/* 286 * Add a hook 287 */ 288static int 289ng_source_newhook(node_p node, hook_p hook, const char *name) 290{ 291 sc_p sc = NG_NODE_PRIVATE(node); 292 293 if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) { 294 sc->input = hook; 295 } else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) { 296 sc->output = hook; 297 sc->output_ifp = 0; 298 bzero(&sc->stats, sizeof(sc->stats)); 299 } else 300 return (EINVAL); 301 302 return (0); 303} 304 305/* 306 * Hook has been added 307 */ 308static int 309ng_source_connect(hook_p hook) 310{ 311 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 312 struct ng_mesg *msg; 313 int dummy_error = 0; 314 315 /* 316 * If this is "output" hook, then request information 317 * from our downstream. 318 */ 319 if (hook == sc->output) { 320 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME, 321 0, M_NOWAIT); 322 if (msg == NULL) 323 return (ENOBUFS); 324 325 /* 326 * Our hook and peer hook have HK_INVALID flag set, 327 * so we can't use NG_SEND_MSG_HOOK() macro here. 328 */ 329 NG_SEND_MSG_ID(dummy_error, sc->node, msg, 330 NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node)); 331 } 332 333 return (0); 334} 335 336/* 337 * Receive a control message 338 */ 339static int 340ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook) 341{ 342 sc_p sc = NG_NODE_PRIVATE(node); 343 struct ng_mesg *msg, *resp = NULL; 344 int error = 0; 345 346 NGI_GET_MSG(item, msg); 347 348 switch (msg->header.typecookie) { 349 case NGM_SOURCE_COOKIE: 350 if (msg->header.flags & NGF_RESP) { 351 error = EINVAL; 352 break; 353 } 354 switch (msg->header.cmd) { 355 case NGM_SOURCE_GET_STATS: 356 case NGM_SOURCE_CLR_STATS: 357 case NGM_SOURCE_GETCLR_STATS: 358 { 359 struct ng_source_stats *stats; 360 361 if (msg->header.cmd != NGM_SOURCE_CLR_STATS) { 362 NG_MKRESPONSE(resp, msg, 363 sizeof(*stats), M_NOWAIT); 364 if (resp == NULL) { 365 error = ENOMEM; 366 goto done; 367 } 368 sc->stats.queueOctets = sc->queueOctets; 369 sc->stats.queueFrames = sc->snd_queue.ifq_len; 370 if ((sc->node->nd_flags & NG_SOURCE_ACTIVE) 371 && !timevalisset(&sc->stats.endTime)) { 372 getmicrotime(&sc->stats.elapsedTime); 373 timevalsub(&sc->stats.elapsedTime, 374 &sc->stats.startTime); 375 } 376 stats = (struct ng_source_stats *)resp->data; 377 bcopy(&sc->stats, stats, sizeof(* stats)); 378 } 379 if (msg->header.cmd != NGM_SOURCE_GET_STATS) 380 bzero(&sc->stats, sizeof(sc->stats)); 381 } 382 break; 383 case NGM_SOURCE_START: 384 { 385 uint64_t packets; 386 387 if (msg->header.arglen != sizeof(uint64_t)) { 388 error = EINVAL; 389 break; 390 } 391 392 packets = *(uint64_t *)msg->data; 393 394 error = ng_source_start(sc, packets); 395 396 break; 397 } 398 case NGM_SOURCE_STOP: 399 ng_source_stop(sc); 400 break; 401 case NGM_SOURCE_CLR_DATA: 402 ng_source_clr_data(sc); 403 break; 404 case NGM_SOURCE_SETIFACE: 405 { 406 char *ifname = (char *)msg->data; 407 408 if (msg->header.arglen < 2) { 409 error = EINVAL; 410 break; 411 } 412 413 ng_source_store_output_ifp(sc, ifname); 414 break; 415 } 416 case NGM_SOURCE_SETPPS: 417 { 418 uint32_t pps; 419 420 if (msg->header.arglen != sizeof(uint32_t)) { 421 error = EINVAL; 422 break; 423 } 424 425 pps = *(uint32_t *)msg->data; 426 427 sc->stats.maxPps = pps; 428 429 break; 430 } 431 case NGM_SOURCE_SET_TIMESTAMP: 432 { 433 struct ng_source_embed_info *embed; 434 435 if (msg->header.arglen != sizeof(*embed)) { 436 error = EINVAL; 437 goto done; 438 } 439 embed = (struct ng_source_embed_info *)msg->data; 440 bcopy(embed, &sc->embed_timestamp, sizeof(*embed)); 441 442 break; 443 } 444 case NGM_SOURCE_GET_TIMESTAMP: 445 { 446 struct ng_source_embed_info *embed; 447 448 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_NOWAIT); 449 if (resp == NULL) { 450 error = ENOMEM; 451 goto done; 452 } 453 embed = (struct ng_source_embed_info *)resp->data; 454 bcopy(&sc->embed_timestamp, embed, sizeof(*embed)); 455 456 break; 457 } 458 case NGM_SOURCE_SET_COUNTER: 459 { 460 struct ng_source_embed_cnt_info *embed; 461 462 if (msg->header.arglen != sizeof(*embed)) { 463 error = EINVAL; 464 goto done; 465 } 466 embed = (struct ng_source_embed_cnt_info *)msg->data; 467 if (embed->index >= NG_SOURCE_COUNTERS || 468 !(embed->width == 1 || embed->width == 2 || 469 embed->width == 4)) { 470 error = EINVAL; 471 goto done; 472 } 473 bcopy(embed, &sc->embed_counter[embed->index], 474 sizeof(*embed)); 475 476 break; 477 } 478 case NGM_SOURCE_GET_COUNTER: 479 { 480 uint8_t index = *(uint8_t *)msg->data; 481 struct ng_source_embed_cnt_info *embed; 482 483 if (index >= NG_SOURCE_COUNTERS) { 484 error = EINVAL; 485 goto done; 486 } 487 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_NOWAIT); 488 if (resp == NULL) { 489 error = ENOMEM; 490 goto done; 491 } 492 embed = (struct ng_source_embed_cnt_info *)resp->data; 493 bcopy(&sc->embed_counter[index], embed, sizeof(*embed)); 494 495 break; 496 } 497 default: 498 error = EINVAL; 499 break; 500 } 501 break; 502 case NGM_ETHER_COOKIE: 503 if (!(msg->header.flags & NGF_RESP)) { 504 error = EINVAL; 505 break; 506 } 507 switch (msg->header.cmd) { 508 case NGM_ETHER_GET_IFNAME: 509 { 510 char *ifname = (char *)msg->data; 511 512 if (msg->header.arglen < 2) { 513 error = EINVAL; 514 break; 515 } 516 517 if (ng_source_store_output_ifp(sc, ifname) == 0) 518 ng_source_set_autosrc(sc, 0); 519 break; 520 } 521 default: 522 error = EINVAL; 523 } 524 break; 525 default: 526 error = EINVAL; 527 break; 528 } 529 530done: 531 /* Take care of synchronous response, if any. */ 532 NG_RESPOND_MSG(error, node, item, resp); 533 /* Free the message and return. */ 534 NG_FREE_MSG(msg); 535 return (error); 536} 537 538/* 539 * Receive data on a hook 540 * 541 * If data comes in the input hook, enqueue it on the send queue. 542 * If data comes in the output hook, discard it. 543 */ 544static int 545ng_source_rcvdata(hook_p hook, item_p item) 546{ 547 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 548 struct mbuf *m; 549 int error = 0; 550 551 NGI_GET_M(item, m); 552 NG_FREE_ITEM(item); 553 554 /* Which hook? */ 555 if (hook == sc->output) { 556 /* discard */ 557 NG_FREE_M(m); 558 return (error); 559 } 560 KASSERT(hook == sc->input, ("%s: no hook!", __func__)); 561 562 /* Enqueue packet. */ 563 /* XXX should we check IF_QFULL() ? */ 564 _IF_ENQUEUE(&sc->snd_queue, m); 565 sc->queueOctets += m->m_pkthdr.len; 566 sc->last_packet = m; 567 568 return (0); 569} 570 571/* 572 * Shutdown processing 573 */ 574static int 575ng_source_rmnode(node_p node) 576{ 577 sc_p sc = NG_NODE_PRIVATE(node); 578 579 ng_source_stop(sc); 580 ng_source_clr_data(sc); 581 NG_NODE_SET_PRIVATE(node, NULL); 582 NG_NODE_UNREF(node); 583 free(sc, M_NETGRAPH); 584 585 return (0); 586} 587 588/* 589 * Hook disconnection 590 */ 591static int 592ng_source_disconnect(hook_p hook) 593{ 594 sc_p sc; 595 596 sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 597 KASSERT(sc != NULL, ("%s: null node private", __func__)); 598 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output) 599 ng_rmnode_self(NG_HOOK_NODE(hook)); 600 return (0); 601} 602 603/* 604 * Set sc->output_ifp to point to the struct ifnet of the interface 605 * reached via our output hook. 606 */ 607static int 608ng_source_store_output_ifp(sc_p sc, char *ifname) 609{ 610 struct ifnet *ifp; 611 612 ifp = ifunit(ifname); 613 614 if (ifp == NULL) { 615 printf("%s: can't find interface %s\n", __func__, ifname); 616 return (EINVAL); 617 } 618 sc->output_ifp = ifp; 619 620#if 1 621 /* XXX mucking with a drivers ifqueue size is ugly but we need it 622 * to queue a lot of packets to get close to line rate on a gigabit 623 * interface with small packets. 624 * XXX we should restore the original value at stop or disconnect 625 */ 626 if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) { 627 printf("ng_source: changing ifq_maxlen from %d to %d\n", 628 ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN); 629 ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN; 630 } 631#endif 632 return (0); 633} 634 635/* 636 * Set the attached ethernet node's ethernet source address override flag. 637 */ 638static int 639ng_source_set_autosrc(sc_p sc, uint32_t flag) 640{ 641 struct ng_mesg *msg; 642 int error = 0; 643 644 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC, 645 sizeof (uint32_t), M_NOWAIT); 646 if (msg == NULL) 647 return(ENOBUFS); 648 649 *(uint32_t *)msg->data = flag; 650 NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0); 651 return (error); 652} 653 654/* 655 * Clear out the data we've queued 656 */ 657static void 658ng_source_clr_data (sc_p sc) 659{ 660 struct mbuf *m; 661 662 for (;;) { 663 _IF_DEQUEUE(&sc->snd_queue, m); 664 if (m == NULL) 665 break; 666 NG_FREE_M(m); 667 } 668 sc->queueOctets = 0; 669 sc->last_packet = NULL; 670} 671 672/* 673 * Start sending queued data out the output hook 674 */ 675static int 676ng_source_start(sc_p sc, uint64_t packets) 677{ 678 if (sc->output_ifp == NULL) { 679 printf("ng_source: start without iface configured\n"); 680 return (ENXIO); 681 } 682 683 if (sc->node->nd_flags & NG_SOURCE_ACTIVE) 684 return (EBUSY); 685 686 sc->node->nd_flags |= NG_SOURCE_ACTIVE; 687 688 sc->packets = packets; 689 timevalclear(&sc->stats.elapsedTime); 690 timevalclear(&sc->stats.endTime); 691 getmicrotime(&sc->stats.startTime); 692 getmicrotime(&sc->stats.lastTime); 693 ng_callout(&sc->intr_ch, sc->node, NULL, 0, 694 ng_source_intr, sc, 0); 695 696 return (0); 697} 698 699/* 700 * Stop sending queued data out the output hook 701 */ 702static void 703ng_source_stop(sc_p sc) 704{ 705 ng_uncallout(&sc->intr_ch, sc->node); 706 sc->node->nd_flags &= ~NG_SOURCE_ACTIVE; 707 getmicrotime(&sc->stats.endTime); 708 sc->stats.elapsedTime = sc->stats.endTime; 709 timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime); 710} 711 712/* 713 * While active called every NG_SOURCE_INTR_TICKS ticks. 714 * Sends as many packets as the interface connected to our 715 * output hook is able to enqueue. 716 */ 717static void 718ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2) 719{ 720 sc_p sc = (sc_p)arg1; 721 struct ifqueue *ifq; 722 int packets; 723 724 KASSERT(sc != NULL, ("%s: null node private", __func__)); 725 726 if (sc->packets == 0 || sc->output == NULL 727 || (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) { 728 ng_source_stop(sc); 729 return; 730 } 731 732 if (sc->output_ifp != NULL) { 733 ifq = (struct ifqueue *)&sc->output_ifp->if_snd; 734 packets = ifq->ifq_maxlen - ifq->ifq_len; 735 } else 736 packets = sc->snd_queue.ifq_len; 737 738 if (sc->stats.maxPps != 0) { 739 struct timeval now, elapsed; 740 uint64_t usec; 741 int maxpkt; 742 743 getmicrotime(&now); 744 elapsed = now; 745 timevalsub(&elapsed, &sc->stats.lastTime); 746 usec = elapsed.tv_sec * 1000000 + elapsed.tv_usec; 747 maxpkt = (uint64_t)sc->stats.maxPps * usec / 1000000; 748 sc->stats.lastTime = now; 749 if (packets > maxpkt) 750 packets = maxpkt; 751 } 752 753 ng_source_send(sc, packets, NULL); 754 if (sc->packets == 0) 755 ng_source_stop(sc); 756 else 757 ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS, 758 ng_source_intr, sc, 0); 759} 760 761/* 762 * Send packets out our output hook. 763 */ 764static int 765ng_source_send(sc_p sc, int tosend, int *sent_p) 766{ 767 struct mbuf *m, *m2; 768 int sent; 769 int error = 0; 770 771 KASSERT(tosend >= 0, ("%s: negative tosend param", __func__)); 772 KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE, 773 ("%s: inactive node", __func__)); 774 775 if ((uint64_t)tosend > sc->packets) 776 tosend = sc->packets; 777 778 /* Go through the queue sending packets one by one. */ 779 for (sent = 0; error == 0 && sent < tosend; ++sent) { 780 _IF_DEQUEUE(&sc->snd_queue, m); 781 if (m == NULL) 782 break; 783 784 /* Duplicate and modify the packet. */ 785 error = ng_source_dup_mod(sc, m, &m2); 786 if (error) { 787 if (error == ENOBUFS) 788 _IF_PREPEND(&sc->snd_queue, m); 789 else 790 _IF_ENQUEUE(&sc->snd_queue, m); 791 break; 792 } 793 794 /* Re-enqueue the original packet for us. */ 795 _IF_ENQUEUE(&sc->snd_queue, m); 796 797 sc->stats.outFrames++; 798 sc->stats.outOctets += m2->m_pkthdr.len; 799 NG_SEND_DATA_ONLY(error, sc->output, m2); 800 if (error) 801 break; 802 } 803 804 sc->packets -= sent; 805 if (sent_p != NULL) 806 *sent_p = sent; 807 return (error); 808} 809 810/* 811 * Modify packet in 'm' by changing 'len' bytes starting at 'offset' 812 * to data in 'cp'. 813 * 814 * The packet data in 'm' must be in a contiguous buffer in a single mbuf. 815 */ 816static void 817ng_source_packet_mod(sc_p sc, struct mbuf *m, int offset, int len, caddr_t cp, 818 int flags) 819{ 820 if (len == 0) 821 return; 822 823 /* Can't modify beyond end of packet. */ 824 /* TODO: Pad packet for this case. */ 825 if (offset + len > m->m_len) 826 return; 827 828 bcopy(cp, mtod_off(m, offset, caddr_t), len); 829} 830 831static void 832ng_source_mod_counter(sc_p sc, struct ng_source_embed_cnt_info *cnt, 833 struct mbuf *m, int increment) 834{ 835 caddr_t cp; 836 uint32_t val; 837 838 val = htonl(cnt->next_val); 839 cp = (caddr_t)&val + sizeof(val) - cnt->width; 840 ng_source_packet_mod(sc, m, cnt->offset, cnt->width, cp, cnt->flags); 841 842 if (increment) { 843 cnt->next_val += increment; 844 845 if (increment > 0 && cnt->next_val > cnt->max_val) { 846 cnt->next_val = cnt->min_val - 1 + 847 (cnt->next_val - cnt->max_val); 848 if (cnt->next_val > cnt->max_val) 849 cnt->next_val = cnt->max_val; 850 } else if (increment < 0 && cnt->next_val < cnt->min_val) { 851 cnt->next_val = cnt->max_val + 1 + 852 (cnt->next_val - cnt->min_val); 853 if (cnt->next_val < cnt->min_val) 854 cnt->next_val = cnt->max_val; 855 } 856 } 857} 858 859static int 860ng_source_dup_mod(sc_p sc, struct mbuf *m0, struct mbuf **m_ptr) 861{ 862 struct mbuf *m; 863 struct ng_source_embed_cnt_info *cnt; 864 struct ng_source_embed_info *ts; 865 int modify; 866 int error = 0; 867 int i, increment; 868 869 /* Are we going to modify packets? */ 870 modify = sc->embed_timestamp.flags & NGM_SOURCE_EMBED_ENABLE; 871 for (i = 0; !modify && i < NG_SOURCE_COUNTERS; ++i) 872 modify = sc->embed_counter[i].flags & NGM_SOURCE_EMBED_ENABLE; 873 874 /* Duplicate the packet. */ 875 if (modify) 876 m = m_dup(m0, M_NOWAIT); 877 else 878 m = m_copypacket(m0, M_NOWAIT); 879 if (m == NULL) { 880 error = ENOBUFS; 881 goto done; 882 } 883 *m_ptr = m; 884 885 if (!modify) 886 goto done; 887 888 /* Modify the copied packet for sending. */ 889 KASSERT(M_WRITABLE(m), ("%s: packet not writable", __func__)); 890 891 for (i = 0; i < NG_SOURCE_COUNTERS; ++i) { 892 cnt = &sc->embed_counter[i]; 893 if (cnt->flags & NGM_SOURCE_EMBED_ENABLE) { 894 if ((cnt->flags & NGM_SOURCE_INC_CNT_PER_LIST) == 0 || 895 sc->last_packet == m0) 896 increment = cnt->increment; 897 else 898 increment = 0; 899 ng_source_mod_counter(sc, cnt, m, increment); 900 } 901 } 902 903 ts = &sc->embed_timestamp; 904 if (ts->flags & NGM_SOURCE_EMBED_ENABLE) { 905 struct timeval now; 906 getmicrotime(&now); 907 now.tv_sec = htonl(now.tv_sec); 908 now.tv_usec = htonl(now.tv_usec); 909 ng_source_packet_mod(sc, m, ts->offset, sizeof (now), 910 (caddr_t)&now, ts->flags); 911 } 912 913done: 914 return(error); 915} 916