sys/netgraph7/ng_source.c

   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 }