lib/sflow_receiver.c

   1 /* Copyright (c) 2002-2009 InMon Corp. Licensed under the terms of either the
   2  *   Sun Industry Standards Source License 1.1, that is available at:
   3  *    http://host-sflow.sourceforge.net/sissl.html
   4  * or the InMon sFlow License, that is available at:
   5  *    http://www.inmon.com/technology/sflowlicense.txt
   6  */
   7
   8 #ifndef __CHECKER__            /* Don't run sparse on anything in this file. */
   9
  10 #include <assert.h>
  11 #include "sflow_api.h"
  12
  13 static void resetSampleCollector(SFLReceiver *receiver);
  14 static void sendSample(SFLReceiver *receiver);
  15 static void sflError(SFLReceiver *receiver, char *errm);
  16 inline static void putNet32(SFLReceiver *receiver, u_int32_t val);
  17 inline static void putAddress(SFLReceiver *receiver, SFLAddress *addr);
  18 #ifdef SFLOW_DO_SOCKET
  19 static void initSocket(SFLReceiver *receiver);
  20 #endif
  21
  22 /*_________________--------------------------__________________
  23   _________________    sfl_receiver_init     __________________
  24   -----------------__________________________------------------
  25 */
  26
  27 void sfl_receiver_init(SFLReceiver *receiver, SFLAgent *agent)
  28 {
  29     /* first clear everything */
  30     memset(receiver, 0, sizeof(*receiver));
  31
  32     /* now copy in the parameters */
  33     receiver->agent = agent;
  34
  35     /* set defaults */
  36     receiver->sFlowRcvrMaximumDatagramSize = SFL_DEFAULT_DATAGRAM_SIZE;
  37     receiver->sFlowRcvrPort = SFL_DEFAULT_COLLECTOR_PORT;
  38
  39 #ifdef SFLOW_DO_SOCKET
  40     /* initialize the socket address */
  41     initSocket(receiver);
  42 #endif
  43
  44     /* preset some of the header fields */
  45     receiver->sampleCollector.datap = receiver->sampleCollector.data;
  46     putNet32(receiver, SFLDATAGRAM_VERSION5);
  47     putAddress(receiver, &agent->myIP);
  48     putNet32(receiver, agent->subId);
  49
  50     /* prepare to receive the first sample */
  51     resetSampleCollector(receiver);
  52 }
  53
  54 /*_________________---------------------------__________________
  55   _________________      reset                __________________
  56   -----------------___________________________------------------
  57
  58   called on timeout, or when owner string is cleared
  59 */
  60
  61 static void reset(SFLReceiver *receiver) {
  62     // ask agent to tell samplers and pollers to stop sending samples
  63     sfl_agent_resetReceiver(receiver->agent, receiver);
  64     // reinitialize
  65     sfl_receiver_init(receiver, receiver->agent);
  66 }
  67
  68 #ifdef SFLOW_DO_SOCKET
  69 /*_________________---------------------------__________________
  70   _________________      initSocket           __________________
  71   -----------------___________________________------------------
  72 */
  73
  74 static void initSocket(SFLReceiver *receiver) {
  75     if(receiver->sFlowRcvrAddress.type == SFLADDRESSTYPE_IP_V6) {
  76         struct sockaddr_in6 *sa6 = &receiver->receiver6;
  77         sa6->sin6_port = htons((u_int16_t)receiver->sFlowRcvrPort);
  78         sa6->sin6_family = AF_INET6;
  79         sa6->sin6_addr = receiver->sFlowRcvrAddress.address.ip_v6;
  80     }
  81     else {
  82         struct sockaddr_in *sa4 = &receiver->receiver4;
  83         sa4->sin_port = htons((u_int16_t)receiver->sFlowRcvrPort);
  84         sa4->sin_family = AF_INET;
  85         sa4->sin_addr = receiver->sFlowRcvrAddress.address.ip_v4;
  86     }
  87 }
  88 #endif
  89
  90 /*_________________----------------------------------------_____________
  91   _________________          MIB Vars                      _____________
  92   -----------------________________________________________-------------
  93 */
  94
  95 char * sfl_receiver_get_sFlowRcvrOwner(SFLReceiver *receiver) {
  96     return receiver->sFlowRcvrOwner;
  97 }
  98 void sfl_receiver_set_sFlowRcvrOwner(SFLReceiver *receiver, char *sFlowRcvrOwner) {
  99     receiver->sFlowRcvrOwner = sFlowRcvrOwner;
 100     if(sFlowRcvrOwner == NULL || sFlowRcvrOwner[0] == '\0') {
 101         // reset condition! owner string was cleared
 102         reset(receiver);
 103     }
 104 }
 105 time_t sfl_receiver_get_sFlowRcvrTimeout(SFLReceiver *receiver) {
 106     return receiver->sFlowRcvrTimeout;
 107 }
 108 void sfl_receiver_set_sFlowRcvrTimeout(SFLReceiver *receiver, time_t sFlowRcvrTimeout) {
 109     receiver->sFlowRcvrTimeout =sFlowRcvrTimeout;
 110 }
 111 u_int32_t sfl_receiver_get_sFlowRcvrMaximumDatagramSize(SFLReceiver *receiver) {
 112     return receiver->sFlowRcvrMaximumDatagramSize;
 113 }
 114 void sfl_receiver_set_sFlowRcvrMaximumDatagramSize(SFLReceiver *receiver, u_int32_t sFlowRcvrMaximumDatagramSize) {
 115     u_int32_t mdz = sFlowRcvrMaximumDatagramSize;
 116     if(mdz < SFL_MIN_DATAGRAM_SIZE) mdz = SFL_MIN_DATAGRAM_SIZE;
 117     receiver->sFlowRcvrMaximumDatagramSize = mdz;
 118 }
 119 SFLAddress *sfl_receiver_get_sFlowRcvrAddress(SFLReceiver *receiver) {
 120     return &receiver->sFlowRcvrAddress;
 121 }
 122 void sfl_receiver_set_sFlowRcvrAddress(SFLReceiver *receiver, SFLAddress *sFlowRcvrAddress) {
 123     if(sFlowRcvrAddress) receiver->sFlowRcvrAddress = *sFlowRcvrAddress; // structure copy
 124 #ifdef SFLOW_DO_SOCKET
 125     initSocket(receiver);
 126 #endif
 127 }
 128 u_int32_t sfl_receiver_get_sFlowRcvrPort(SFLReceiver *receiver) {
 129     return receiver->sFlowRcvrPort;
 130 }
 131 void sfl_receiver_set_sFlowRcvrPort(SFLReceiver *receiver, u_int32_t sFlowRcvrPort) {
 132     receiver->sFlowRcvrPort = sFlowRcvrPort;
 133     // update the socket structure
 134 #ifdef SFLOW_DO_SOCKET
 135     initSocket(receiver);
 136 #endif
 137 }
 138
 139 /*_________________---------------------------__________________
 140   _________________   sfl_receiver_tick       __________________
 141   -----------------___________________________------------------
 142 */
 143
 144 void sfl_receiver_tick(SFLReceiver *receiver, time_t now)
 145 {
 146     // if there are any samples to send, flush them now
 147     if(receiver->sampleCollector.numSamples > 0) sendSample(receiver);
 148     // check the timeout
 149     if(receiver->sFlowRcvrTimeout && (u_int32_t)receiver->sFlowRcvrTimeout != 0xFFFFFFFF) {
 150         // count down one tick and reset if we reach 0
 151         if(--receiver->sFlowRcvrTimeout == 0) reset(receiver);
 152     }
 153 }
 154
 155 /*_________________-----------------------------__________________
 156   _________________   receiver write utilities  __________________
 157   -----------------_____________________________------------------
 158 */
 159
 160 inline static void put32(SFLReceiver *receiver, u_int32_t val)
 161 {
 162     *receiver->sampleCollector.datap++ = val;
 163 }
 164
 165 inline static void putNet32(SFLReceiver *receiver, u_int32_t val)
 166 {
 167     *receiver->sampleCollector.datap++ = htonl(val);
 168 }
 169
 170 inline static void putNet32_run(SFLReceiver *receiver, void *obj, size_t quads)
 171 {
 172     u_int32_t *from = (u_int32_t *)obj;
 173     while(quads--) putNet32(receiver, *from++);
 174 }
 175
 176 inline static void putNet64(SFLReceiver *receiver, u_int64_t val64)
 177 {
 178     u_int32_t *firstQuadPtr = receiver->sampleCollector.datap;
 179     // first copy the bytes in
 180     memcpy((u_char *)firstQuadPtr, &val64, 8);
 181     if(htonl(1) != 1) {
 182         // swap the bytes, and reverse the quads too
 183         u_int32_t tmp = *receiver->sampleCollector.datap++;
 184         *firstQuadPtr = htonl(*receiver->sampleCollector.datap);
 185         *receiver->sampleCollector.datap++ = htonl(tmp);
 186     }
 187     else receiver->sampleCollector.datap += 2;
 188 }
 189
 190 inline static void put128(SFLReceiver *receiver, u_char *val)
 191 {
 192     memcpy(receiver->sampleCollector.datap, val, 16);
 193     receiver->sampleCollector.datap += 4;
 194 }
 195
 196 inline static void putString(SFLReceiver *receiver, SFLString *s)
 197 {
 198     putNet32(receiver, s->len);
 199     memcpy(receiver->sampleCollector.datap, s->str, s->len);
 200     receiver->sampleCollector.datap += (s->len + 3) / 4; /* pad to 4-byte boundary */
 201     if ((s->len % 4) != 0){
 202         u_int8_t padding = 4 - (s->len % 4);
 203         memset(((u_int8_t*)receiver->sampleCollector.datap)-padding, 0, padding);
 204     }
 205 }
 206
 207 inline static u_int32_t stringEncodingLength(SFLString *s) {
 208     // answer in bytes,  so remember to mulitply by 4 after rounding up to nearest 4-byte boundary
 209     return 4 + (((s->len + 3) / 4) * 4);
 210 }
 211
 212 inline static void putAddress(SFLReceiver *receiver, SFLAddress *addr)
 213 {
 214     // encode unspecified addresses as IPV4:0.0.0.0 - or should we flag this as an error?
 215     if(addr->type == 0) {
 216         putNet32(receiver, SFLADDRESSTYPE_IP_V4);
 217         put32(receiver, 0);
 218     }
 219     else {
 220         putNet32(receiver, addr->type);
 221         if(addr->type == SFLADDRESSTYPE_IP_V4) put32(receiver, addr->address.ip_v4.addr);
 222         else put128(receiver, addr->address.ip_v6.addr);
 223     }
 224 }
 225
 226 inline static u_int32_t addressEncodingLength(SFLAddress *addr) {
 227     return (addr->type == SFLADDRESSTYPE_IP_V6) ? 20 : 8;  // type + address (unspecified == IPV4)
 228 }
 229
 230 inline static void putMACAddress(SFLReceiver *receiver, u_int8_t *mac)
 231 {
 232     memcpy(receiver->sampleCollector.datap, mac, 6);
 233     receiver->sampleCollector.datap += 2;
 234 }
 235
 236 inline static void putSwitch(SFLReceiver *receiver, SFLExtended_switch *sw)
 237 {
 238     putNet32(receiver, sw->src_vlan);
 239     putNet32(receiver, sw->src_priority);
 240     putNet32(receiver, sw->dst_vlan);
 241     putNet32(receiver, sw->dst_priority);
 242 }
 243
 244 inline static void putRouter(SFLReceiver *receiver, SFLExtended_router *router)
 245 {
 246     putAddress(receiver, &router->nexthop);
 247     putNet32(receiver, router->src_mask);
 248     putNet32(receiver, router->dst_mask);
 249 }
 250
 251 inline static u_int32_t routerEncodingLength(SFLExtended_router *router) {
 252     return addressEncodingLength(&router->nexthop) + 8;
 253 }
 254
 255 inline static void putGateway(SFLReceiver *receiver, SFLExtended_gateway *gw)
 256 {
 257     putAddress(receiver, &gw->nexthop);
 258     putNet32(receiver, gw->as);
 259     putNet32(receiver, gw->src_as);
 260     putNet32(receiver, gw->src_peer_as);
 261     putNet32(receiver, gw->dst_as_path_segments);
 262     {
 263         u_int32_t seg = 0;
 264         for(; seg < gw->dst_as_path_segments; seg++) {
 265             putNet32(receiver, gw->dst_as_path[seg].type);
 266             putNet32(receiver, gw->dst_as_path[seg].length);
 267             putNet32_run(receiver, gw->dst_as_path[seg].as.seq, gw->dst_as_path[seg].length);
 268         }
 269     }
 270     putNet32(receiver, gw->communities_length);
 271     putNet32_run(receiver, gw->communities, gw->communities_length);
 272     putNet32(receiver, gw->localpref);
 273 }
 274
 275 inline static u_int32_t gatewayEncodingLength(SFLExtended_gateway *gw) {
 276     u_int32_t elemSiz = addressEncodingLength(&gw->nexthop);
 277     u_int32_t seg = 0;
 278     elemSiz += 16; // as, src_as, src_peer_as, dst_as_path_segments
 279     for(; seg < gw->dst_as_path_segments; seg++) {
 280         elemSiz += 8; // type, length
 281         elemSiz += 4 * gw->dst_as_path[seg].length; // set/seq bytes
 282     }
 283     elemSiz += 4; // communities_length
 284     elemSiz += 4 * gw->communities_length; // communities
 285     elemSiz += 4; // localpref
 286     return elemSiz;
 287 }
 288
 289 inline static void putUser(SFLReceiver *receiver, SFLExtended_user *user)
 290 {
 291     putNet32(receiver, user->src_charset);
 292     putString(receiver, &user->src_user);
 293     putNet32(receiver, user->dst_charset);
 294     putString(receiver, &user->dst_user);
 295 }
 296
 297 inline static u_int32_t userEncodingLength(SFLExtended_user *user) {
 298     return 4
 299         + stringEncodingLength(&user->src_user)
 300         + 4
 301         + stringEncodingLength(&user->dst_user);
 302 }
 303
 304 inline static void putUrl(SFLReceiver *receiver, SFLExtended_url *url)
 305 {
 306     putNet32(receiver, url->direction);
 307     putString(receiver, &url->url);
 308     putString(receiver, &url->host);
 309 }
 310
 311 inline static u_int32_t urlEncodingLength(SFLExtended_url *url) {
 312     return 4
 313         + stringEncodingLength(&url->url)
 314         + stringEncodingLength(&url->host);
 315 }
 316
 317 inline static void putLabelStack(SFLReceiver *receiver, SFLLabelStack *labelStack)
 318 {
 319     putNet32(receiver, labelStack->depth);
 320     putNet32_run(receiver, labelStack->stack, labelStack->depth);
 321 }
 322
 323 inline static u_int32_t labelStackEncodingLength(SFLLabelStack *labelStack) {
 324     return 4 + (4 * labelStack->depth);
 325 }
 326
 327 inline static void putMpls(SFLReceiver *receiver, SFLExtended_mpls *mpls)
 328 {
 329     putAddress(receiver, &mpls->nextHop);
 330     putLabelStack(receiver, &mpls->in_stack);
 331     putLabelStack(receiver, &mpls->out_stack);
 332 }
 333
 334 inline static u_int32_t mplsEncodingLength(SFLExtended_mpls *mpls) {
 335     return addressEncodingLength(&mpls->nextHop)
 336         + labelStackEncodingLength(&mpls->in_stack)
 337         + labelStackEncodingLength(&mpls->out_stack);
 338 }
 339
 340 inline static void putNat(SFLReceiver *receiver, SFLExtended_nat *nat)
 341 {
 342     putAddress(receiver, &nat->src);
 343     putAddress(receiver, &nat->dst);
 344 }
 345
 346 inline static u_int32_t natEncodingLength(SFLExtended_nat *nat) {
 347     return addressEncodingLength(&nat->src)
 348         + addressEncodingLength(&nat->dst);
 349 }
 350
 351 inline static void putMplsTunnel(SFLReceiver *receiver, SFLExtended_mpls_tunnel *tunnel)
 352 {
 353     putString(receiver, &tunnel->tunnel_lsp_name);
 354     putNet32(receiver, tunnel->tunnel_id);
 355     putNet32(receiver, tunnel->tunnel_cos);
 356 }
 357
 358 inline static u_int32_t mplsTunnelEncodingLength(SFLExtended_mpls_tunnel *tunnel) {
 359     return stringEncodingLength(&tunnel->tunnel_lsp_name) + 8;
 360 }
 361
 362 inline static void putMplsVc(SFLReceiver *receiver, SFLExtended_mpls_vc *vc)
 363 {
 364     putString(receiver, &vc->vc_instance_name);
 365     putNet32(receiver, vc->vll_vc_id);
 366     putNet32(receiver, vc->vc_label_cos);
 367 }
 368
 369 inline static u_int32_t mplsVcEncodingLength(SFLExtended_mpls_vc *vc) {
 370     return stringEncodingLength( &vc->vc_instance_name) + 8;
 371 }
 372
 373 inline static void putMplsFtn(SFLReceiver *receiver, SFLExtended_mpls_FTN *ftn)
 374 {
 375     putString(receiver, &ftn->mplsFTNDescr);
 376     putNet32(receiver, ftn->mplsFTNMask);
 377 }
 378
 379 inline static u_int32_t mplsFtnEncodingLength(SFLExtended_mpls_FTN *ftn) {
 380     return stringEncodingLength( &ftn->mplsFTNDescr) + 4;
 381 }
 382
 383 inline static void putMplsLdpFec(SFLReceiver *receiver, SFLExtended_mpls_LDP_FEC *ldpfec)
 384 {
 385     putNet32(receiver, ldpfec->mplsFecAddrPrefixLength);
 386 }
 387
 388 inline static u_int32_t mplsLdpFecEncodingLength(SFLExtended_mpls_LDP_FEC *ldpfec) {
 389     return 4;
 390 }
 391
 392 inline static void putVlanTunnel(SFLReceiver *receiver, SFLExtended_vlan_tunnel *vlanTunnel)
 393 {
 394     putLabelStack(receiver, &vlanTunnel->stack);
 395 }
 396
 397 inline static u_int32_t vlanTunnelEncodingLength(SFLExtended_vlan_tunnel *vlanTunnel) {
 398     return labelStackEncodingLength(&vlanTunnel->stack);
 399 }
 400
 401
 402 inline static void putGenericCounters(SFLReceiver *receiver, SFLIf_counters *counters)
 403 {
 404     putNet32(receiver, counters->ifIndex);
 405     putNet32(receiver, counters->ifType);
 406     putNet64(receiver, counters->ifSpeed);
 407     putNet32(receiver, counters->ifDirection);
 408     putNet32(receiver, counters->ifStatus);
 409     putNet64(receiver, counters->ifInOctets);
 410     putNet32(receiver, counters->ifInUcastPkts);
 411     putNet32(receiver, counters->ifInMulticastPkts);
 412     putNet32(receiver, counters->ifInBroadcastPkts);
 413     putNet32(receiver, counters->ifInDiscards);
 414     putNet32(receiver, counters->ifInErrors);
 415     putNet32(receiver, counters->ifInUnknownProtos);
 416     putNet64(receiver, counters->ifOutOctets);
 417     putNet32(receiver, counters->ifOutUcastPkts);
 418     putNet32(receiver, counters->ifOutMulticastPkts);
 419     putNet32(receiver, counters->ifOutBroadcastPkts);
 420     putNet32(receiver, counters->ifOutDiscards);
 421     putNet32(receiver, counters->ifOutErrors);
 422     putNet32(receiver, counters->ifPromiscuousMode);
 423 }
 424
 425
 426 /*_________________-----------------------------__________________
 427   _________________      computeFlowSampleSize  __________________
 428   -----------------_____________________________------------------
 429 */
 430
 431 static int computeFlowSampleSize(SFLReceiver *receiver, SFL_FLOW_SAMPLE_TYPE *fs)
 432 {
 433     SFLFlow_sample_element *elem = fs->elements;
 434 #ifdef SFL_USE_32BIT_INDEX
 435     u_int siz = 52; /* tag, length, sequence_number, ds_class, ds_index, sampling_rate,
 436                        sample_pool, drops, inputFormat, input, outputFormat, output, number of elements */
 437 #else
 438     u_int siz = 40; /* tag, length, sequence_number, source_id, sampling_rate,
 439                        sample_pool, drops, input, output, number of elements */
 440 #endif
 441
 442     fs->num_elements = 0; /* we're going to count them again even if this was set by the client */
 443     for(; elem != NULL; elem = elem->nxt) {
 444         u_int elemSiz = 0;
 445         fs->num_elements++;
 446         siz += 8; /* tag, length */
 447         switch(elem->tag) {
 448         case SFLFLOW_HEADER:
 449             elemSiz = 16; /* header_protocol, frame_length, stripped, header_length */
 450             elemSiz += ((elem->flowType.header.header_length + 3) / 4) * 4; /* header, rounded up to nearest 4 bytes */
 451             break;
 452         case SFLFLOW_ETHERNET: elemSiz = sizeof(SFLSampled_ethernet); break;
 453         case SFLFLOW_IPV4: elemSiz = sizeof(SFLSampled_ipv4); break;
 454         case SFLFLOW_IPV6: elemSiz = sizeof(SFLSampled_ipv6); break;
 455         case SFLFLOW_EX_SWITCH: elemSiz = sizeof(SFLExtended_switch); break;
 456         case SFLFLOW_EX_ROUTER: elemSiz = routerEncodingLength(&elem->flowType.router); break;
 457         case SFLFLOW_EX_GATEWAY: elemSiz = gatewayEncodingLength(&elem->flowType.gateway); break;
 458         case SFLFLOW_EX_USER: elemSiz = userEncodingLength(&elem->flowType.user); break;
 459         case SFLFLOW_EX_URL: elemSiz = urlEncodingLength(&elem->flowType.url); break;
 460         case SFLFLOW_EX_MPLS: elemSiz = mplsEncodingLength(&elem->flowType.mpls); break;
 461         case SFLFLOW_EX_NAT: elemSiz = natEncodingLength(&elem->flowType.nat); break;
 462         case SFLFLOW_EX_MPLS_TUNNEL: elemSiz = mplsTunnelEncodingLength(&elem->flowType.mpls_tunnel); break;
 463         case SFLFLOW_EX_MPLS_VC: elemSiz = mplsVcEncodingLength(&elem->flowType.mpls_vc); break;
 464         case SFLFLOW_EX_MPLS_FTN: elemSiz = mplsFtnEncodingLength(&elem->flowType.mpls_ftn); break;
 465         case SFLFLOW_EX_MPLS_LDP_FEC: elemSiz = mplsLdpFecEncodingLength(&elem->flowType.mpls_ldp_fec); break;
 466         case SFLFLOW_EX_VLAN_TUNNEL: elemSiz = vlanTunnelEncodingLength(&elem->flowType.vlan_tunnel); break;
 467         default:
 468             sflError(receiver, "unexpected packet_data_tag");
 469             return -1;
 470             break;
 471         }
 472         // cache the element size, and accumulate it into the overall FlowSample size
 473         elem->length = elemSiz;
 474         siz += elemSiz;
 475     }
 476
 477     return siz;
 478 }
 479
 480 /*_________________-------------------------------__________________
 481   _________________ sfl_receiver_writeFlowSample  __________________
 482   -----------------_______________________________------------------
 483 */
 484
 485 int sfl_receiver_writeFlowSample(SFLReceiver *receiver, SFL_FLOW_SAMPLE_TYPE *fs)
 486 {
 487     int packedSize;
 488     if(fs == NULL) return -1;
 489     if((packedSize = computeFlowSampleSize(receiver, fs)) == -1) return -1;
 490
 491     // check in case this one sample alone is too big for the datagram
 492     // in fact - if it is even half as big then we should ditch it. Very
 493     // important to avoid overruning the packet buffer.
 494     if(packedSize > (int)(receiver->sFlowRcvrMaximumDatagramSize / 2)) {
 495         sflError(receiver, "flow sample too big for datagram");
 496         return -1;
 497     }
 498
 499     // if the sample pkt is full enough so that this sample might put
 500     // it over the limit, then we should send it now before going on.
 501     if((receiver->sampleCollector.pktlen + packedSize) >= receiver->sFlowRcvrMaximumDatagramSize)
 502         sendSample(receiver);
 503
 504     receiver->sampleCollector.numSamples++;
 505
 506 #ifdef SFL_USE_32BIT_INDEX
 507     putNet32(receiver, SFLFLOW_SAMPLE_EXPANDED);
 508 #else
 509     putNet32(receiver, SFLFLOW_SAMPLE);
 510 #endif
 511
 512     putNet32(receiver, packedSize - 8); // don't include tag and len
 513     putNet32(receiver, fs->sequence_number);
 514
 515 #ifdef SFL_USE_32BIT_INDEX
 516     putNet32(receiver, fs->ds_class);
 517     putNet32(receiver, fs->ds_index);
 518 #else
 519     putNet32(receiver, fs->source_id);
 520 #endif
 521
 522     putNet32(receiver, fs->sampling_rate);
 523     putNet32(receiver, fs->sample_pool);
 524     putNet32(receiver, fs->drops);
 525
 526 #ifdef SFL_USE_32BIT_INDEX
 527     putNet32(receiver, fs->inputFormat);
 528     putNet32(receiver, fs->input);
 529     putNet32(receiver, fs->outputFormat);
 530     putNet32(receiver, fs->output);
 531 #else
 532     putNet32(receiver, fs->input);
 533     putNet32(receiver, fs->output);
 534 #endif
 535
 536     putNet32(receiver, fs->num_elements);
 537
 538     {
 539         SFLFlow_sample_element *elem = fs->elements;
 540         for(; elem != NULL; elem = elem->nxt) {
 541
 542             putNet32(receiver, elem->tag);
 543             putNet32(receiver, elem->length); // length cached in computeFlowSampleSize()
 544
 545             switch(elem->tag) {
 546             case SFLFLOW_HEADER:
 547                 putNet32(receiver, elem->flowType.header.header_protocol);
 548                 putNet32(receiver, elem->flowType.header.frame_length);
 549                 putNet32(receiver, elem->flowType.header.stripped);
 550                 putNet32(receiver, elem->flowType.header.header_length);
 551                 /* the header */
 552                 memcpy(receiver->sampleCollector.datap, elem->flowType.header.header_bytes, elem->flowType.header.header_length);
 553                 /* round up to multiple of 4 to preserve alignment */
 554                 receiver->sampleCollector.datap += ((elem->flowType.header.header_length + 3) / 4);
 555                 break;
 556             case SFLFLOW_ETHERNET:
 557                 putNet32(receiver, elem->flowType.ethernet.eth_len);
 558                 putMACAddress(receiver, elem->flowType.ethernet.src_mac);
 559                 putMACAddress(receiver, elem->flowType.ethernet.dst_mac);
 560                 putNet32(receiver, elem->flowType.ethernet.eth_type);
 561                 break;
 562             case SFLFLOW_IPV4:
 563                 putNet32(receiver, elem->flowType.ipv4.length);
 564                 putNet32(receiver, elem->flowType.ipv4.protocol);
 565                 put32(receiver, elem->flowType.ipv4.src_ip.addr);
 566                 put32(receiver, elem->flowType.ipv4.dst_ip.addr);
 567                 putNet32(receiver, elem->flowType.ipv4.src_port);
 568                 putNet32(receiver, elem->flowType.ipv4.dst_port);
 569                 putNet32(receiver, elem->flowType.ipv4.tcp_flags);
 570                 putNet32(receiver, elem->flowType.ipv4.tos);
 571                 break;
 572             case SFLFLOW_IPV6:
 573                 putNet32(receiver, elem->flowType.ipv6.length);
 574                 putNet32(receiver, elem->flowType.ipv6.protocol);
 575                 put128(receiver, elem->flowType.ipv6.src_ip.addr);
 576                 put128(receiver, elem->flowType.ipv6.dst_ip.addr);
 577                 putNet32(receiver, elem->flowType.ipv6.src_port);
 578                 putNet32(receiver, elem->flowType.ipv6.dst_port);
 579                 putNet32(receiver, elem->flowType.ipv6.tcp_flags);
 580                 putNet32(receiver, elem->flowType.ipv6.priority);
 581                 break;
 582             case SFLFLOW_EX_SWITCH: putSwitch(receiver, &elem->flowType.sw); break;
 583             case SFLFLOW_EX_ROUTER: putRouter(receiver, &elem->flowType.router); break;
 584             case SFLFLOW_EX_GATEWAY: putGateway(receiver, &elem->flowType.gateway); break;
 585             case SFLFLOW_EX_USER: putUser(receiver, &elem->flowType.user); break;
 586             case SFLFLOW_EX_URL: putUrl(receiver, &elem->flowType.url); break;
 587             case SFLFLOW_EX_MPLS: putMpls(receiver, &elem->flowType.mpls); break;
 588             case SFLFLOW_EX_NAT: putNat(receiver, &elem->flowType.nat); break;
 589             case SFLFLOW_EX_MPLS_TUNNEL: putMplsTunnel(receiver, &elem->flowType.mpls_tunnel); break;
 590             case SFLFLOW_EX_MPLS_VC: putMplsVc(receiver, &elem->flowType.mpls_vc); break;
 591             case SFLFLOW_EX_MPLS_FTN: putMplsFtn(receiver, &elem->flowType.mpls_ftn); break;
 592             case SFLFLOW_EX_MPLS_LDP_FEC: putMplsLdpFec(receiver, &elem->flowType.mpls_ldp_fec); break;
 593             case SFLFLOW_EX_VLAN_TUNNEL: putVlanTunnel(receiver, &elem->flowType.vlan_tunnel); break;
 594             default:
 595                 sflError(receiver, "unexpected packet_data_tag");
 596                 return -1;
 597                 break;
 598             }
 599         }
 600     }
 601
 602     // sanity check
 603     assert(((u_char *)receiver->sampleCollector.datap
 604             - (u_char *)receiver->sampleCollector.data
 605             - receiver->sampleCollector.pktlen)  == (u_int32_t)packedSize);
 606
 607     // update the pktlen
 608     receiver->sampleCollector.pktlen = (u_char *)receiver->sampleCollector.datap - (u_char *)receiver->sampleCollector.data;
 609     return packedSize;
 610 }
 611
 612 /*_________________-----------------------------__________________
 613   _________________ computeCountersSampleSize   __________________
 614   -----------------_____________________________------------------
 615 */
 616
 617 static int computeCountersSampleSize(SFLReceiver *receiver, SFL_COUNTERS_SAMPLE_TYPE *cs)
 618 {
 619     SFLCounters_sample_element *elem = cs->elements;
 620 #ifdef SFL_USE_32BIT_INDEX
 621     u_int siz = 24; /* tag, length, sequence_number, ds_class, ds_index, number of elements */
 622 #else
 623     u_int siz = 20; /* tag, length, sequence_number, source_id, number of elements */
 624 #endif
 625
 626     cs->num_elements = 0; /* we're going to count them again even if this was set by the client */
 627     for(; elem != NULL; elem = elem->nxt) {
 628         u_int elemSiz = 0;
 629         cs->num_elements++;
 630         siz += 8; /* tag, length */
 631         switch(elem->tag) {
 632         case SFLCOUNTERS_GENERIC:  elemSiz = sizeof(elem->counterBlock.generic); break;
 633         case SFLCOUNTERS_ETHERNET: elemSiz = sizeof(elem->counterBlock.ethernet); break;
 634         case SFLCOUNTERS_TOKENRING: elemSiz = sizeof(elem->counterBlock.tokenring); break;
 635         case SFLCOUNTERS_VG: elemSiz = sizeof(elem->counterBlock.vg); break;
 636         case SFLCOUNTERS_VLAN: elemSiz = sizeof(elem->counterBlock.vlan); break;
 637         default:
 638             sflError(receiver, "unexpected counters_tag");
 639             return -1;
 640             break;
 641         }
 642         // cache the element size, and accumulate it into the overall FlowSample size
 643         elem->length = elemSiz;
 644         siz += elemSiz;
 645     }
 646     return siz;
 647 }
 648
 649 /*_________________----------------------------------__________________
 650   _________________ sfl_receiver_writeCountersSample __________________
 651   -----------------__________________________________------------------
 652 */
 653
 654 int sfl_receiver_writeCountersSample(SFLReceiver *receiver, SFL_COUNTERS_SAMPLE_TYPE *cs)
 655 {
 656     int packedSize;
 657     if(cs == NULL) return -1;
 658     // if the sample pkt is full enough so that this sample might put
 659     // it over the limit, then we should send it now.
 660     if((packedSize = computeCountersSampleSize(receiver, cs)) == -1) return -1;
 661
 662     // check in case this one sample alone is too big for the datagram
 663     // in fact - if it is even half as big then we should ditch it. Very
 664     // important to avoid overruning the packet buffer.
 665     if(packedSize > (int)(receiver->sFlowRcvrMaximumDatagramSize / 2)) {
 666         sflError(receiver, "counters sample too big for datagram");
 667         return -1;
 668     }
 669
 670     if((receiver->sampleCollector.pktlen + packedSize) >= receiver->sFlowRcvrMaximumDatagramSize)
 671         sendSample(receiver);
 672
 673     receiver->sampleCollector.numSamples++;
 674
 675 #ifdef SFL_USE_32BIT_INDEX
 676     putNet32(receiver, SFLCOUNTERS_SAMPLE_EXPANDED);
 677 #else
 678     putNet32(receiver, SFLCOUNTERS_SAMPLE);
 679 #endif
 680
 681     putNet32(receiver, packedSize - 8); // tag and length not included
 682     putNet32(receiver, cs->sequence_number);
 683
 684 #ifdef SFL_USE_32BIT_INDEX
 685     putNet32(receiver, cs->ds_class);
 686     putNet32(receiver, cs->ds_index);
 687 #else
 688     putNet32(receiver, cs->source_id);
 689 #endif
 690
 691     putNet32(receiver, cs->num_elements);
 692
 693     {
 694         SFLCounters_sample_element *elem = cs->elements;
 695         for(; elem != NULL; elem = elem->nxt) {
 696
 697             putNet32(receiver, elem->tag);
 698             putNet32(receiver, elem->length); // length cached in computeCountersSampleSize()
 699
 700             switch(elem->tag) {
 701             case SFLCOUNTERS_GENERIC:
 702                 putGenericCounters(receiver, &(elem->counterBlock.generic));
 703                 break;
 704             case SFLCOUNTERS_ETHERNET:
 705                 // all these counters are 32-bit
 706                 putNet32_run(receiver, &elem->counterBlock.ethernet, sizeof(elem->counterBlock.ethernet) / 4);
 707                 break;
 708             case SFLCOUNTERS_TOKENRING:
 709                 // all these counters are 32-bit
 710                 putNet32_run(receiver, &elem->counterBlock.tokenring, sizeof(elem->counterBlock.tokenring) / 4);
 711                 break;
 712             case SFLCOUNTERS_VG:
 713                 // mixed sizes
 714                 putNet32(receiver, elem->counterBlock.vg.dot12InHighPriorityFrames);
 715                 putNet64(receiver, elem->counterBlock.vg.dot12InHighPriorityOctets);
 716                 putNet32(receiver, elem->counterBlock.vg.dot12InNormPriorityFrames);
 717                 putNet64(receiver, elem->counterBlock.vg.dot12InNormPriorityOctets);
 718                 putNet32(receiver, elem->counterBlock.vg.dot12InIPMErrors);
 719                 putNet32(receiver, elem->counterBlock.vg.dot12InOversizeFrameErrors);
 720                 putNet32(receiver, elem->counterBlock.vg.dot12InDataErrors);
 721                 putNet32(receiver, elem->counterBlock.vg.dot12InNullAddressedFrames);
 722                 putNet32(receiver, elem->counterBlock.vg.dot12OutHighPriorityFrames);
 723                 putNet64(receiver, elem->counterBlock.vg.dot12OutHighPriorityOctets);
 724                 putNet32(receiver, elem->counterBlock.vg.dot12TransitionIntoTrainings);
 725                 putNet64(receiver, elem->counterBlock.vg.dot12HCInHighPriorityOctets);
 726                 putNet64(receiver, elem->counterBlock.vg.dot12HCInNormPriorityOctets);
 727                 putNet64(receiver, elem->counterBlock.vg.dot12HCOutHighPriorityOctets);
 728                 break;
 729             case SFLCOUNTERS_VLAN:
 730                 // mixed sizes
 731                 putNet32(receiver, elem->counterBlock.vlan.vlan_id);
 732                 putNet64(receiver, elem->counterBlock.vlan.octets);
 733                 putNet32(receiver, elem->counterBlock.vlan.ucastPkts);
 734                 putNet32(receiver, elem->counterBlock.vlan.multicastPkts);
 735                 putNet32(receiver, elem->counterBlock.vlan.broadcastPkts);
 736                 putNet32(receiver, elem->counterBlock.vlan.discards);
 737                 break;
 738             default:
 739                 sflError(receiver, "unexpected counters_tag");
 740                 return -1;
 741                 break;
 742             }
 743         }
 744     }
 745     // sanity check
 746     assert(((u_char *)receiver->sampleCollector.datap
 747             - (u_char *)receiver->sampleCollector.data
 748             - receiver->sampleCollector.pktlen)  == (u_int32_t)packedSize);
 749
 750     // update the pktlen
 751     receiver->sampleCollector.pktlen = (u_char *)receiver->sampleCollector.datap - (u_char *)receiver->sampleCollector.data;
 752     return packedSize;
 753 }
 754
 755 /*_________________---------------------------------__________________
 756   _________________ sfl_receiver_samplePacketsSent  __________________
 757   -----------------_________________________________------------------
 758 */
 759
 760 u_int32_t sfl_receiver_samplePacketsSent(SFLReceiver *receiver)
 761 {
 762     return receiver->sampleCollector.packetSeqNo;
 763 }
 764
 765 /*_________________---------------------------__________________
 766   _________________     sendSample            __________________
 767   -----------------___________________________------------------
 768 */
 769
 770 static void sendSample(SFLReceiver *receiver)
 771 {
 772     /* construct and send out the sample, then reset for the next one... */
 773     /* first fill in the header with the latest values */
 774     /* version, agent_address and sub_agent_id were pre-set. */
 775     u_int32_t hdrIdx = (receiver->agent->myIP.type == SFLADDRESSTYPE_IP_V6) ? 7 : 4;
 776     receiver->sampleCollector.data[hdrIdx++] = htonl(++receiver->sampleCollector.packetSeqNo); /* seq no */
 777     receiver->sampleCollector.data[hdrIdx++] = htonl((receiver->agent->now - receiver->agent->bootTime) * 1000); /* uptime */
 778     receiver->sampleCollector.data[hdrIdx++] = htonl(receiver->sampleCollector.numSamples); /* num samples */
 779     /* send */
 780     if(receiver->agent->sendFn) (*receiver->agent->sendFn)(receiver->agent->magic,
 781                                                            receiver->agent,
 782                                                            receiver,
 783                                                            (u_char *)receiver->sampleCollector.data,
 784                                                            receiver->sampleCollector.pktlen);
 785     else {
 786 #ifdef SFLOW_DO_SOCKET
 787         /* send it myself */
 788         if (receiver->sFlowRcvrAddress.type == SFLADDRESSTYPE_IP_V6) {
 789             u_int32_t soclen = sizeof(struct sockaddr_in6);
 790             int result = sendto(receiver->agent->receiverSocket6,
 791                                 receiver->sampleCollector.data,
 792                                 receiver->sampleCollector.pktlen,
 793                                 0,
 794                                 (struct sockaddr *)&receiver->receiver6,
 795                                 soclen);
 796             if(result == -1 && errno != EINTR) sfl_agent_sysError(receiver->agent, "receiver", "IPv6 socket sendto error");
 797             if(result == 0) sfl_agent_error(receiver->agent, "receiver", "IPv6 socket sendto returned 0");
 798         }
 799         else {
 800             u_int32_t soclen = sizeof(struct sockaddr_in);
 801             int result = sendto(receiver->agent->receiverSocket4,
 802                                 receiver->sampleCollector.data,
 803                                 receiver->sampleCollector.pktlen,
 804                                 0,
 805                                 (struct sockaddr *)&receiver->receiver4,
 806                                 soclen);
 807             if(result == -1 && errno != EINTR) sfl_agent_sysError(receiver->agent, "receiver", "socket sendto error");
 808             if(result == 0) sfl_agent_error(receiver->agent, "receiver", "socket sendto returned 0");
 809         }
 810 #endif
 811     }
 812
 813     /* reset for the next time */
 814     resetSampleCollector(receiver);
 815 }
 816
 817 /*_________________---------------------------__________________
 818   _________________   resetSampleCollector    __________________
 819   -----------------___________________________------------------
 820 */
 821
 822 static void resetSampleCollector(SFLReceiver *receiver)
 823 {
 824     receiver->sampleCollector.pktlen = 0;
 825     receiver->sampleCollector.numSamples = 0;
 826     /* point the datap to just after the header */
 827     receiver->sampleCollector.datap = (receiver->agent->myIP.type == SFLADDRESSTYPE_IP_V6) ?
 828         (receiver->sampleCollector.data + 10) :  (receiver->sampleCollector.data + 7);
 829
 830     receiver->sampleCollector.pktlen = (u_char *)receiver->sampleCollector.datap - (u_char *)receiver->sampleCollector.data;
 831 }
 832
 833 /*_________________---------------------------__________________
 834   _________________         sflError          __________________
 835   -----------------___________________________------------------
 836 */
 837
 838 static void sflError(SFLReceiver *receiver, char *msg)
 839 {
 840     sfl_agent_error(receiver->agent, "receiver", msg);
 841     resetSampleCollector(receiver);
 842 }
 843
 844 #endif  /* !__CHECKER__ */