ng_source.c revision 218909
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 218909 2011-02-21 09:01:34Z brucec $"); 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 <net/vnet.h> 72#include <netgraph/ng_message.h> 73#include <netgraph/netgraph.h> 74#include <netgraph/ng_parse.h> 75#include <netgraph/ng_ether.h> 76#include <netgraph/ng_source.h> 77 78#define NG_SOURCE_INTR_TICKS 1 79#define NG_SOURCE_DRIVER_IFQ_MAXLEN (4*1024) 80 81#define mtod_off(m,off,t) ((t)(mtod((m),caddr_t)+(off))) 82 83/* Per node info */ 84struct privdata { 85 node_p node; 86 hook_p input; 87 hook_p output; 88 struct ng_source_stats stats; 89 struct ifqueue snd_queue; /* packets to send */ 90 struct mbuf *last_packet; /* last pkt in queue */ 91 struct ifnet *output_ifp; 92 struct callout intr_ch; 93 uint64_t packets; /* packets to send */ 94 uint32_t queueOctets; 95 struct ng_source_embed_info embed_timestamp; 96 struct ng_source_embed_cnt_info embed_counter[NG_SOURCE_COUNTERS]; 97}; 98typedef struct privdata *sc_p; 99 100/* Node flags */ 101#define NG_SOURCE_ACTIVE (NGF_TYPE1) 102 103/* Netgraph methods */ 104static ng_constructor_t ng_source_constructor; 105static ng_rcvmsg_t ng_source_rcvmsg; 106static ng_shutdown_t ng_source_rmnode; 107static ng_newhook_t ng_source_newhook; 108static ng_connect_t ng_source_connect; 109static ng_rcvdata_t ng_source_rcvdata; 110static ng_disconnect_t ng_source_disconnect; 111 112/* Other functions */ 113static void ng_source_intr(node_p, hook_p, void *, int); 114static void ng_source_clr_data (sc_p); 115static int ng_source_start (sc_p, uint64_t); 116static void ng_source_stop (sc_p); 117static int ng_source_send (sc_p, int, int *); 118static int ng_source_store_output_ifp(sc_p, char *); 119static void ng_source_packet_mod(sc_p, struct mbuf *, 120 int, int, caddr_t, int); 121static void ng_source_mod_counter(sc_p sc, 122 struct ng_source_embed_cnt_info *cnt, 123 struct mbuf *m, int increment); 124static int ng_source_dup_mod(sc_p, struct mbuf *, 125 struct mbuf **); 126 127/* Parse type for timeval */ 128static const struct ng_parse_struct_field ng_source_timeval_type_fields[] = { 129 { "tv_sec", &ng_parse_int32_type }, 130 { "tv_usec", &ng_parse_int32_type }, 131 { NULL } 132}; 133const struct ng_parse_type ng_source_timeval_type = { 134 &ng_parse_struct_type, 135 &ng_source_timeval_type_fields 136}; 137 138/* Parse type for struct ng_source_stats */ 139static const struct ng_parse_struct_field ng_source_stats_type_fields[] 140 = NG_SOURCE_STATS_TYPE_INFO; 141static const struct ng_parse_type ng_source_stats_type = { 142 &ng_parse_struct_type, 143 &ng_source_stats_type_fields 144}; 145 146/* Parse type for struct ng_source_embed_info */ 147static const struct ng_parse_struct_field ng_source_embed_type_fields[] = 148 NG_SOURCE_EMBED_TYPE_INFO; 149static const struct ng_parse_type ng_source_embed_type = { 150 &ng_parse_struct_type, 151 &ng_source_embed_type_fields 152}; 153 154/* Parse type for struct ng_source_embed_cnt_info */ 155static const struct ng_parse_struct_field ng_source_embed_cnt_type_fields[] = 156 NG_SOURCE_EMBED_CNT_TYPE_INFO; 157static const struct ng_parse_type ng_source_embed_cnt_type = { 158 &ng_parse_struct_type, 159 &ng_source_embed_cnt_type_fields 160}; 161 162/* List of commands and how to convert arguments to/from ASCII */ 163static const struct ng_cmdlist ng_source_cmds[] = { 164 { 165 NGM_SOURCE_COOKIE, 166 NGM_SOURCE_GET_STATS, 167 "getstats", 168 NULL, 169 &ng_source_stats_type 170 }, 171 { 172 NGM_SOURCE_COOKIE, 173 NGM_SOURCE_CLR_STATS, 174 "clrstats", 175 NULL, 176 NULL 177 }, 178 { 179 NGM_SOURCE_COOKIE, 180 NGM_SOURCE_GETCLR_STATS, 181 "getclrstats", 182 NULL, 183 &ng_source_stats_type 184 }, 185 { 186 NGM_SOURCE_COOKIE, 187 NGM_SOURCE_START, 188 "start", 189 &ng_parse_uint64_type, 190 NULL 191 }, 192 { 193 NGM_SOURCE_COOKIE, 194 NGM_SOURCE_STOP, 195 "stop", 196 NULL, 197 NULL 198 }, 199 { 200 NGM_SOURCE_COOKIE, 201 NGM_SOURCE_CLR_DATA, 202 "clrdata", 203 NULL, 204 NULL 205 }, 206 { 207 NGM_SOURCE_COOKIE, 208 NGM_SOURCE_SETIFACE, 209 "setiface", 210 &ng_parse_string_type, 211 NULL 212 }, 213 { 214 NGM_SOURCE_COOKIE, 215 NGM_SOURCE_SETPPS, 216 "setpps", 217 &ng_parse_uint32_type, 218 NULL 219 }, 220 { 221 NGM_SOURCE_COOKIE, 222 NGM_SOURCE_SET_TIMESTAMP, 223 "settimestamp", 224 &ng_source_embed_type, 225 NULL 226 }, 227 { 228 NGM_SOURCE_COOKIE, 229 NGM_SOURCE_GET_TIMESTAMP, 230 "gettimestamp", 231 NULL, 232 &ng_source_embed_type 233 }, 234 { 235 NGM_SOURCE_COOKIE, 236 NGM_SOURCE_SET_COUNTER, 237 "setcounter", 238 &ng_source_embed_cnt_type, 239 NULL 240 }, 241 { 242 NGM_SOURCE_COOKIE, 243 NGM_SOURCE_GET_COUNTER, 244 "getcounter", 245 &ng_parse_uint8_type, 246 &ng_source_embed_cnt_type 247 }, 248 { 0 } 249}; 250 251/* Netgraph type descriptor */ 252static struct ng_type ng_source_typestruct = { 253 .version = NG_ABI_VERSION, 254 .name = NG_SOURCE_NODE_TYPE, 255 .constructor = ng_source_constructor, 256 .rcvmsg = ng_source_rcvmsg, 257 .shutdown = ng_source_rmnode, 258 .newhook = ng_source_newhook, 259 .connect = ng_source_connect, 260 .rcvdata = ng_source_rcvdata, 261 .disconnect = ng_source_disconnect, 262 .cmdlist = ng_source_cmds, 263}; 264NETGRAPH_INIT(source, &ng_source_typestruct); 265 266static int ng_source_set_autosrc(sc_p, uint32_t); 267 268/* 269 * Node constructor 270 */ 271static int 272ng_source_constructor(node_p node) 273{ 274 sc_p sc; 275 276 sc = malloc(sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO); 277 if (sc == NULL) 278 return (ENOMEM); 279 280 NG_NODE_SET_PRIVATE(node, sc); 281 sc->node = node; 282 sc->snd_queue.ifq_maxlen = 2048; /* XXX not checked */ 283 ng_callout_init(&sc->intr_ch); 284 285 return (0); 286} 287 288/* 289 * Add a hook 290 */ 291static int 292ng_source_newhook(node_p node, hook_p hook, const char *name) 293{ 294 sc_p sc = NG_NODE_PRIVATE(node); 295 296 if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) { 297 sc->input = hook; 298 } else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) { 299 sc->output = hook; 300 sc->output_ifp = 0; 301 bzero(&sc->stats, sizeof(sc->stats)); 302 } else 303 return (EINVAL); 304 305 return (0); 306} 307 308/* 309 * Hook has been added 310 */ 311static int 312ng_source_connect(hook_p hook) 313{ 314 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 315 struct ng_mesg *msg; 316 int dummy_error = 0; 317 318 /* 319 * If this is "output" hook, then request information 320 * from our downstream. 321 */ 322 if (hook == sc->output) { 323 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME, 324 0, M_NOWAIT); 325 if (msg == NULL) 326 return (ENOBUFS); 327 328 /* 329 * Our hook and peer hook have HK_INVALID flag set, 330 * so we can't use NG_SEND_MSG_HOOK() macro here. 331 */ 332 NG_SEND_MSG_ID(dummy_error, sc->node, msg, 333 NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node)); 334 } 335 336 return (0); 337} 338 339/* 340 * Receive a control message 341 */ 342static int 343ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook) 344{ 345 sc_p sc = NG_NODE_PRIVATE(node); 346 struct ng_mesg *msg, *resp = NULL; 347 int error = 0; 348 349 NGI_GET_MSG(item, msg); 350 351 switch (msg->header.typecookie) { 352 case NGM_SOURCE_COOKIE: 353 if (msg->header.flags & NGF_RESP) { 354 error = EINVAL; 355 break; 356 } 357 switch (msg->header.cmd) { 358 case NGM_SOURCE_GET_STATS: 359 case NGM_SOURCE_CLR_STATS: 360 case NGM_SOURCE_GETCLR_STATS: 361 { 362 struct ng_source_stats *stats; 363 364 if (msg->header.cmd != NGM_SOURCE_CLR_STATS) { 365 NG_MKRESPONSE(resp, msg, 366 sizeof(*stats), M_NOWAIT); 367 if (resp == NULL) { 368 error = ENOMEM; 369 goto done; 370 } 371 sc->stats.queueOctets = sc->queueOctets; 372 sc->stats.queueFrames = sc->snd_queue.ifq_len; 373 if ((sc->node->nd_flags & NG_SOURCE_ACTIVE) 374 && !timevalisset(&sc->stats.endTime)) { 375 getmicrotime(&sc->stats.elapsedTime); 376 timevalsub(&sc->stats.elapsedTime, 377 &sc->stats.startTime); 378 } 379 stats = (struct ng_source_stats *)resp->data; 380 bcopy(&sc->stats, stats, sizeof(* stats)); 381 } 382 if (msg->header.cmd != NGM_SOURCE_GET_STATS) 383 bzero(&sc->stats, sizeof(sc->stats)); 384 } 385 break; 386 case NGM_SOURCE_START: 387 { 388 uint64_t packets; 389 390 if (msg->header.arglen != sizeof(uint64_t)) { 391 error = EINVAL; 392 break; 393 } 394 395 packets = *(uint64_t *)msg->data; 396 397 error = ng_source_start(sc, packets); 398 399 break; 400 } 401 case NGM_SOURCE_STOP: 402 ng_source_stop(sc); 403 break; 404 case NGM_SOURCE_CLR_DATA: 405 ng_source_clr_data(sc); 406 break; 407 case NGM_SOURCE_SETIFACE: 408 { 409 char *ifname = (char *)msg->data; 410 411 if (msg->header.arglen < 2) { 412 error = EINVAL; 413 break; 414 } 415 416 ng_source_store_output_ifp(sc, ifname); 417 break; 418 } 419 case NGM_SOURCE_SETPPS: 420 { 421 uint32_t pps; 422 423 if (msg->header.arglen != sizeof(uint32_t)) { 424 error = EINVAL; 425 break; 426 } 427 428 pps = *(uint32_t *)msg->data; 429 430 sc->stats.maxPps = pps; 431 432 break; 433 } 434 case NGM_SOURCE_SET_TIMESTAMP: 435 { 436 struct ng_source_embed_info *embed; 437 438 if (msg->header.arglen != sizeof(*embed)) { 439 error = EINVAL; 440 goto done; 441 } 442 embed = (struct ng_source_embed_info *)msg->data; 443 bcopy(embed, &sc->embed_timestamp, sizeof(*embed)); 444 445 break; 446 } 447 case NGM_SOURCE_GET_TIMESTAMP: 448 { 449 struct ng_source_embed_info *embed; 450 451 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_DONTWAIT); 452 if (resp == NULL) { 453 error = ENOMEM; 454 goto done; 455 } 456 embed = (struct ng_source_embed_info *)resp->data; 457 bcopy(&sc->embed_timestamp, embed, sizeof(*embed)); 458 459 break; 460 } 461 case NGM_SOURCE_SET_COUNTER: 462 { 463 struct ng_source_embed_cnt_info *embed; 464 465 if (msg->header.arglen != sizeof(*embed)) { 466 error = EINVAL; 467 goto done; 468 } 469 embed = (struct ng_source_embed_cnt_info *)msg->data; 470 if (embed->index >= NG_SOURCE_COUNTERS || 471 !(embed->width == 1 || embed->width == 2 || 472 embed->width == 4)) { 473 error = EINVAL; 474 goto done; 475 } 476 bcopy(embed, &sc->embed_counter[embed->index], 477 sizeof(*embed)); 478 479 break; 480 } 481 case NGM_SOURCE_GET_COUNTER: 482 { 483 uint8_t index = *(uint8_t *)msg->data; 484 struct ng_source_embed_cnt_info *embed; 485 486 if (index >= NG_SOURCE_COUNTERS) { 487 error = EINVAL; 488 goto done; 489 } 490 NG_MKRESPONSE(resp, msg, sizeof(*embed), M_DONTWAIT); 491 if (resp == NULL) { 492 error = ENOMEM; 493 goto done; 494 } 495 embed = (struct ng_source_embed_cnt_info *)resp->data; 496 bcopy(&sc->embed_counter[index], embed, sizeof(*embed)); 497 498 break; 499 } 500 default: 501 error = EINVAL; 502 break; 503 } 504 break; 505 case NGM_ETHER_COOKIE: 506 if (!(msg->header.flags & NGF_RESP)) { 507 error = EINVAL; 508 break; 509 } 510 switch (msg->header.cmd) { 511 case NGM_ETHER_GET_IFNAME: 512 { 513 char *ifname = (char *)msg->data; 514 515 if (msg->header.arglen < 2) { 516 error = EINVAL; 517 break; 518 } 519 520 if (ng_source_store_output_ifp(sc, ifname) == 0) 521 ng_source_set_autosrc(sc, 0); 522 break; 523 } 524 default: 525 error = EINVAL; 526 } 527 break; 528 default: 529 error = EINVAL; 530 break; 531 } 532 533done: 534 /* Take care of synchronous response, if any. */ 535 NG_RESPOND_MSG(error, node, item, resp); 536 /* Free the message and return. */ 537 NG_FREE_MSG(msg); 538 return (error); 539} 540 541/* 542 * Receive data on a hook 543 * 544 * If data comes in the input hook, enqueue it on the send queue. 545 * If data comes in the output hook, discard it. 546 */ 547static int 548ng_source_rcvdata(hook_p hook, item_p item) 549{ 550 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 551 struct mbuf *m; 552 int error = 0; 553 554 NGI_GET_M(item, m); 555 NG_FREE_ITEM(item); 556 557 /* Which hook? */ 558 if (hook == sc->output) { 559 /* discard */ 560 NG_FREE_M(m); 561 return (error); 562 } 563 KASSERT(hook == sc->input, ("%s: no hook!", __func__)); 564 565 /* Enqueue packet. */ 566 /* XXX should we check IF_QFULL() ? */ 567 _IF_ENQUEUE(&sc->snd_queue, m); 568 sc->queueOctets += m->m_pkthdr.len; 569 sc->last_packet = m; 570 571 return (0); 572} 573 574/* 575 * Shutdown processing 576 */ 577static int 578ng_source_rmnode(node_p node) 579{ 580 sc_p sc = NG_NODE_PRIVATE(node); 581 582 ng_source_stop(sc); 583 ng_source_clr_data(sc); 584 NG_NODE_SET_PRIVATE(node, NULL); 585 NG_NODE_UNREF(node); 586 free(sc, M_NETGRAPH); 587 588 return (0); 589} 590 591/* 592 * Hook disconnection 593 */ 594static int 595ng_source_disconnect(hook_p hook) 596{ 597 sc_p sc; 598 599 sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 600 KASSERT(sc != NULL, ("%s: null node private", __func__)); 601 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output) 602 ng_rmnode_self(NG_HOOK_NODE(hook)); 603 return (0); 604} 605 606/* 607 * Set sc->output_ifp to point to the struct ifnet of the interface 608 * reached via our output hook. 609 */ 610static int 611ng_source_store_output_ifp(sc_p sc, char *ifname) 612{ 613 struct ifnet *ifp; 614 int s; 615 616 ifp = ifunit(ifname); 617 618 if (ifp == NULL) { 619 printf("%s: can't find interface %s\n", __func__, ifname); 620 return (EINVAL); 621 } 622 sc->output_ifp = ifp; 623 624#if 1 625 /* XXX mucking with a drivers ifqueue size is ugly but we need it 626 * to queue a lot of packets to get close to line rate on a gigabit 627 * interface with small packets. 628 * XXX we should restore the original value at stop or disconnect 629 */ 630 s = splimp(); /* XXX is this required? */ 631 if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) { 632 printf("ng_source: changing ifq_maxlen from %d to %d\n", 633 ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN); 634 ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN; 635 } 636 splx(s); 637#endif 638 return (0); 639} 640 641/* 642 * Set the attached ethernet node's ethernet source address override flag. 643 */ 644static int 645ng_source_set_autosrc(sc_p sc, uint32_t flag) 646{ 647 struct ng_mesg *msg; 648 int error = 0; 649 650 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC, 651 sizeof (uint32_t), M_NOWAIT); 652 if (msg == NULL) 653 return(ENOBUFS); 654 655 *(uint32_t *)msg->data = flag; 656 NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0); 657 return (error); 658} 659 660/* 661 * Clear out the data we've queued 662 */ 663static void 664ng_source_clr_data (sc_p sc) 665{ 666 struct mbuf *m; 667 668 for (;;) { 669 _IF_DEQUEUE(&sc->snd_queue, m); 670 if (m == NULL) 671 break; 672 NG_FREE_M(m); 673 } 674 sc->queueOctets = 0; 675 sc->last_packet = NULL; 676} 677 678/* 679 * Start sending queued data out the output hook 680 */ 681static int 682ng_source_start(sc_p sc, uint64_t packets) 683{ 684 if (sc->output_ifp == NULL) { 685 printf("ng_source: start without iface configured\n"); 686 return (ENXIO); 687 } 688 689 if (sc->node->nd_flags & NG_SOURCE_ACTIVE) 690 return (EBUSY); 691 692 sc->node->nd_flags |= NG_SOURCE_ACTIVE; 693 694 sc->packets = packets; 695 timevalclear(&sc->stats.elapsedTime); 696 timevalclear(&sc->stats.endTime); 697 getmicrotime(&sc->stats.startTime); 698 getmicrotime(&sc->stats.lastTime); 699 ng_callout(&sc->intr_ch, sc->node, NULL, 0, 700 ng_source_intr, sc, 0); 701 702 return (0); 703} 704 705/* 706 * Stop sending queued data out the output hook 707 */ 708static void 709ng_source_stop(sc_p sc) 710{ 711 ng_uncallout(&sc->intr_ch, sc->node); 712 sc->node->nd_flags &= ~NG_SOURCE_ACTIVE; 713 getmicrotime(&sc->stats.endTime); 714 sc->stats.elapsedTime = sc->stats.endTime; 715 timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime); 716} 717 718/* 719 * While active called every NG_SOURCE_INTR_TICKS ticks. 720 * Sends as many packets as the interface connected to our 721 * output hook is able to enqueue. 722 */ 723static void 724ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2) 725{ 726 sc_p sc = (sc_p)arg1; 727 struct ifqueue *ifq; 728 int packets; 729 730 KASSERT(sc != NULL, ("%s: null node private", __func__)); 731 732 if (sc->packets == 0 || sc->output == NULL 733 || (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) { 734 ng_source_stop(sc); 735 return; 736 } 737 738 if (sc->output_ifp != NULL) { 739 ifq = (struct ifqueue *)&sc->output_ifp->if_snd; 740 packets = ifq->ifq_maxlen - ifq->ifq_len; 741 } else 742 packets = sc->snd_queue.ifq_len; 743 744 if (sc->stats.maxPps != 0) { 745 struct timeval now, elapsed; 746 uint64_t usec; 747 int maxpkt; 748 749 getmicrotime(&now); 750 elapsed = now; 751 timevalsub(&elapsed, &sc->stats.lastTime); 752 usec = elapsed.tv_sec * 1000000 + elapsed.tv_usec; 753 maxpkt = (uint64_t)sc->stats.maxPps * usec / 1000000; 754 sc->stats.lastTime = now; 755 if (packets > maxpkt) 756 packets = maxpkt; 757 } 758 759 ng_source_send(sc, packets, NULL); 760 if (sc->packets == 0) 761 ng_source_stop(sc); 762 else 763 ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS, 764 ng_source_intr, sc, 0); 765} 766 767/* 768 * Send packets out our output hook. 769 */ 770static int 771ng_source_send(sc_p sc, int tosend, int *sent_p) 772{ 773 struct mbuf *m, *m2; 774 int sent; 775 int error = 0; 776 777 KASSERT(tosend >= 0, ("%s: negative tosend param", __func__)); 778 KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE, 779 ("%s: inactive node", __func__)); 780 781 if ((uint64_t)tosend > sc->packets) 782 tosend = sc->packets; 783 784 /* Go through the queue sending packets one by one. */ 785 for (sent = 0; error == 0 && sent < tosend; ++sent) { 786 _IF_DEQUEUE(&sc->snd_queue, m); 787 if (m == NULL) 788 break; 789 790 /* Duplicate and modify the packet. */ 791 error = ng_source_dup_mod(sc, m, &m2); 792 if (error) { 793 if (error == ENOBUFS) 794 _IF_PREPEND(&sc->snd_queue, m); 795 else 796 _IF_ENQUEUE(&sc->snd_queue, m); 797 break; 798 } 799 800 /* Re-enqueue the original packet for us. */ 801 _IF_ENQUEUE(&sc->snd_queue, m); 802 803 sc->stats.outFrames++; 804 sc->stats.outOctets += m2->m_pkthdr.len; 805 NG_SEND_DATA_ONLY(error, sc->output, m2); 806 if (error) 807 break; 808 } 809 810 sc->packets -= sent; 811 if (sent_p != NULL) 812 *sent_p = sent; 813 return (error); 814} 815 816/* 817 * Modify packet in 'm' by changing 'len' bytes starting at 'offset' 818 * to data in 'cp'. 819 * 820 * The packet data in 'm' must be in a contiguous buffer in a single mbuf. 821 */ 822static void 823ng_source_packet_mod(sc_p sc, struct mbuf *m, int offset, int len, caddr_t cp, 824 int flags) 825{ 826 if (len == 0) 827 return; 828 829 /* Can't modify beyond end of packet. */ 830 /* TODO: Pad packet for this case. */ 831 if (offset + len > m->m_len) 832 return; 833 834 bcopy(cp, mtod_off(m, offset, caddr_t), len); 835} 836 837static void 838ng_source_mod_counter(sc_p sc, struct ng_source_embed_cnt_info *cnt, 839 struct mbuf *m, int increment) 840{ 841 caddr_t cp; 842 uint32_t val; 843 844 val = htonl(cnt->next_val); 845 cp = (caddr_t)&val + sizeof(val) - cnt->width; 846 ng_source_packet_mod(sc, m, cnt->offset, cnt->width, cp, cnt->flags); 847 848 if (increment) { 849 cnt->next_val += increment; 850 851 if (increment > 0 && cnt->next_val > cnt->max_val) { 852 cnt->next_val = cnt->min_val - 1 + 853 (cnt->next_val - cnt->max_val); 854 if (cnt->next_val > cnt->max_val) 855 cnt->next_val = cnt->max_val; 856 } else if (increment < 0 && cnt->next_val < cnt->min_val) { 857 cnt->next_val = cnt->max_val + 1 + 858 (cnt->next_val - cnt->min_val); 859 if (cnt->next_val < cnt->min_val) 860 cnt->next_val = cnt->max_val; 861 } 862 } 863} 864 865static int 866ng_source_dup_mod(sc_p sc, struct mbuf *m0, struct mbuf **m_ptr) 867{ 868 struct mbuf *m; 869 struct ng_source_embed_cnt_info *cnt; 870 struct ng_source_embed_info *ts; 871 int modify; 872 int error = 0; 873 int i, increment; 874 875 /* Are we going to modify packets? */ 876 modify = sc->embed_timestamp.flags & NGM_SOURCE_EMBED_ENABLE; 877 for (i = 0; !modify && i < NG_SOURCE_COUNTERS; ++i) 878 modify = sc->embed_counter[i].flags & NGM_SOURCE_EMBED_ENABLE; 879 880 /* Duplicate the packet. */ 881 if (modify) 882 m = m_dup(m0, M_DONTWAIT); 883 else 884 m = m_copypacket(m0, M_DONTWAIT); 885 if (m == NULL) { 886 error = ENOBUFS; 887 goto done; 888 } 889 *m_ptr = m; 890 891 if (!modify) 892 goto done; 893 894 /* Modify the copied packet for sending. */ 895 KASSERT(M_WRITABLE(m), ("%s: packet not writable", __func__)); 896 897 for (i = 0; i < NG_SOURCE_COUNTERS; ++i) { 898 cnt = &sc->embed_counter[i]; 899 if (cnt->flags & NGM_SOURCE_EMBED_ENABLE) { 900 if ((cnt->flags & NGM_SOURCE_INC_CNT_PER_LIST) == 0 || 901 sc->last_packet == m0) 902 increment = cnt->increment; 903 else 904 increment = 0; 905 ng_source_mod_counter(sc, cnt, m, increment); 906 } 907 } 908 909 ts = &sc->embed_timestamp; 910 if (ts->flags & NGM_SOURCE_EMBED_ENABLE) { 911 struct timeval now; 912 getmicrotime(&now); 913 now.tv_sec = htonl(now.tv_sec); 914 now.tv_usec = htonl(now.tv_usec); 915 ng_source_packet_mod(sc, m, ts->offset, sizeof (now), 916 (caddr_t)&now, ts->flags); 917 } 918 919done: 920 return(error); 921} 922