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   1 /*      $OpenBSD: print-cnfp.c,v 1.2 1998/06/25 20:26:59 mickey Exp $   */
   2
   3 /*
   4  * Copyright (c) 1998 Michael Shalayeff
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Michael Shalayeff.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /* \summary: Cisco NetFlow protocol printer */
  34
  35 /*
  36  * Cisco NetFlow protocol
  37  *
  38  * See
  39  *
  40  *    https://www.cisco.com/c/en/us/td/docs/net_mgmt/netflow_collection_engine/3-6/user/guide/format.html#wp1005892
  41  */
  42
  43 #ifdef HAVE_CONFIG_H
  44 #include <config.h>
  45 #endif
  46
  47 #include "netdissect-stdinc.h"
  48
  49 #include <stdio.h>
  50 #include <string.h>
  51
  52 #include "netdissect.h"
  53 #include "addrtoname.h"
  54 #include "extract.h"
  55
  56 #include "tcp.h"
  57 #include "ipproto.h"
  58
  59 struct nfhdr_v1 {
  60         nd_uint16_t     version;        /* version number */
  61         nd_uint16_t     count;          /* # of records */
  62         nd_uint32_t     msys_uptime;
  63         nd_uint32_t     utc_sec;
  64         nd_uint32_t     utc_nsec;
  65 };
  66
  67 struct nfrec_v1 {
  68         nd_ipv4         src_ina;
  69         nd_ipv4         dst_ina;
  70         nd_ipv4         nhop_ina;
  71         nd_uint16_t     input;          /* SNMP index of input interface */
  72         nd_uint16_t     output;         /* SNMP index of output interface */
  73         nd_uint32_t     packets;        /* packets in the flow */
  74         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
  75         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
  76         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
  77         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
  78         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
  79         nd_byte         pad1[2];        /* pad */
  80         nd_uint8_t      proto;          /* IP protocol type */
  81         nd_uint8_t      tos;            /* IP type of service */
  82         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
  83         nd_byte         pad[3];         /* padding */
  84         nd_uint32_t     reserved;       /* unused */
  85 };
  86
  87 struct nfhdr_v5 {
  88         nd_uint16_t     version;        /* version number */
  89         nd_uint16_t     count;          /* # of records */
  90         nd_uint32_t     msys_uptime;
  91         nd_uint32_t     utc_sec;
  92         nd_uint32_t     utc_nsec;
  93         nd_uint32_t     sequence;       /* flow sequence number */
  94         nd_uint8_t      engine_type;    /* type of flow-switching engine */
  95         nd_uint8_t      engine_id;      /* slot number of the flow-switching engine */
  96         nd_uint16_t     sampling_interval; /* sampling mode and interval */
  97 };
  98
  99 struct nfrec_v5 {
 100         nd_ipv4         src_ina;
 101         nd_ipv4         dst_ina;
 102         nd_ipv4         nhop_ina;
 103         nd_uint16_t     input;          /* SNMP index of input interface */
 104         nd_uint16_t     output;         /* SNMP index of output interface */
 105         nd_uint32_t     packets;        /* packets in the flow */
 106         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
 107         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
 108         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
 109         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
 110         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
 111         nd_byte         pad1;           /* pad */
 112         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
 113         nd_uint8_t      proto;          /* IP protocol type */
 114         nd_uint8_t      tos;            /* IP type of service */
 115         nd_uint16_t     src_as;         /* AS number of the source */
 116         nd_uint16_t     dst_as;         /* AS number of the destination */
 117         nd_uint8_t      src_mask;       /* source address mask bits */
 118         nd_uint8_t      dst_mask;       /* destination address prefix mask bits */
 119         nd_byte         pad2[2];
 120         nd_ipv4         peer_nexthop;   /* v6: IP address of the nexthop within the peer (FIB)*/
 121 };
 122
 123 struct nfhdr_v6 {
 124         nd_uint16_t     version;        /* version number */
 125         nd_uint16_t     count;          /* # of records */
 126         nd_uint32_t     msys_uptime;
 127         nd_uint32_t     utc_sec;
 128         nd_uint32_t     utc_nsec;
 129         nd_uint32_t     sequence;       /* v5 flow sequence number */
 130         nd_uint32_t     reserved;       /* v5 only */
 131 };
 132
 133 struct nfrec_v6 {
 134         nd_ipv4         src_ina;
 135         nd_ipv4         dst_ina;
 136         nd_ipv4         nhop_ina;
 137         nd_uint16_t     input;          /* SNMP index of input interface */
 138         nd_uint16_t     output;         /* SNMP index of output interface */
 139         nd_uint32_t     packets;        /* packets in the flow */
 140         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
 141         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
 142         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
 143         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
 144         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
 145         nd_byte         pad1;           /* pad */
 146         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
 147         nd_uint8_t      proto;          /* IP protocol type */
 148         nd_uint8_t      tos;            /* IP type of service */
 149         nd_uint16_t     src_as;         /* AS number of the source */
 150         nd_uint16_t     dst_as;         /* AS number of the destination */
 151         nd_uint8_t      src_mask;       /* source address mask bits */
 152         nd_uint8_t      dst_mask;       /* destination address prefix mask bits */
 153         nd_uint16_t     flags;
 154         nd_ipv4         peer_nexthop;   /* v6: IP address of the nexthop within the peer (FIB)*/
 155 };
 156
 157 static void
 158 cnfp_v1_print(netdissect_options *ndo, const u_char *cp)
 159 {
 160         const struct nfhdr_v1 *nh;
 161         const struct nfrec_v1 *nr;
 162         const char *p_name;
 163         uint8_t proto;
 164         u_int nrecs, ver;
 165 #if 0
 166         time_t t;
 167 #endif
 168
 169         nh = (const struct nfhdr_v1 *)cp;
 170         ND_TCHECK_SIZE(nh);
 171
 172         ver = GET_BE_U_2(nh->version);
 173         nrecs = GET_BE_U_4(nh->count);
 174 #if 0
 175         /*
 176          * This is seconds since the UN*X epoch, and is followed by
 177          * nanoseconds.  XXX - format it, rather than just dumping the
 178          * raw seconds-since-the-Epoch.
 179          */
 180         t = GET_BE_U_4(nh->utc_sec);
 181 #endif
 182
 183         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 184                GET_BE_U_4(nh->msys_uptime)/1000,
 185                GET_BE_U_4(nh->msys_uptime)%1000,
 186                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 187
 188         nr = (const struct nfrec_v1 *)&nh[1];
 189
 190         ND_PRINT("%2u recs", nrecs);
 191
 192         for (; nrecs != 0; nr++, nrecs--) {
 193                 char buf[20];
 194                 char asbuf[20];
 195
 196                 /*
 197                  * Make sure we have the entire record.
 198                  */
 199                 ND_TCHECK_SIZE(nr);
 200                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 201                        GET_BE_U_4(nr->start_time)/1000,
 202                        GET_BE_U_4(nr->start_time)%1000,
 203                        GET_BE_U_4(nr->last_time)/1000,
 204                        GET_BE_U_4(nr->last_time)%1000);
 205
 206                 asbuf[0] = buf[0] = '\0';
 207                 ND_PRINT("\n    %s%s%s:%u ",
 208                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 209                         buf, asbuf,
 210                         GET_BE_U_2(nr->srcport));
 211
 212                 ND_PRINT("> %s%s%s:%u ",
 213                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 214                         buf, asbuf,
 215                         GET_BE_U_2(nr->dstport));
 216
 217                 ND_PRINT(">> %s\n    ",
 218                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 219
 220                 proto = GET_U_1(nr->proto);
 221                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 222                         ND_PRINT("%s ", p_name);
 223                 else
 224                         ND_PRINT("%u ", proto);
 225
 226                 /* tcp flags for tcp only */
 227                 if (proto == IPPROTO_TCP) {
 228                         u_int flags;
 229                         flags = GET_U_1(nr->tcp_flags);
 230                         ND_PRINT("%s%s%s%s%s%s%s",
 231                                 flags & TH_FIN  ? "F" : "",
 232                                 flags & TH_SYN  ? "S" : "",
 233                                 flags & TH_RST  ? "R" : "",
 234                                 flags & TH_PUSH ? "P" : "",
 235                                 flags & TH_ACK  ? "A" : "",
 236                                 flags & TH_URG  ? "U" : "",
 237                                 flags           ? " " : "");
 238                 }
 239
 240                 buf[0]='\0';
 241                 ND_PRINT("tos %u, %u (%u octets) %s",
 242                        GET_U_1(nr->tos),
 243                        GET_BE_U_4(nr->packets),
 244                        GET_BE_U_4(nr->octets), buf);
 245         }
 246         return;
 247
 248 trunc:
 249         nd_print_trunc(ndo);
 250         return;
 251 }
 252
 253 static void
 254 cnfp_v5_print(netdissect_options *ndo, const u_char *cp)
 255 {
 256         const struct nfhdr_v5 *nh;
 257         const struct nfrec_v5 *nr;
 258         const char *p_name;
 259         uint8_t proto;
 260         u_int nrecs, ver;
 261 #if 0
 262         time_t t;
 263 #endif
 264
 265         nh = (const struct nfhdr_v5 *)cp;
 266         ND_TCHECK_SIZE(nh);
 267
 268         ver = GET_BE_U_2(nh->version);
 269         nrecs = GET_BE_U_4(nh->count);
 270 #if 0
 271         /*
 272          * This is seconds since the UN*X epoch, and is followed by
 273          * nanoseconds.  XXX - format it, rather than just dumping the
 274          * raw seconds-since-the-Epoch.
 275          */
 276         t = GET_BE_U_4(nh->utc_sec);
 277 #endif
 278
 279         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 280                GET_BE_U_4(nh->msys_uptime)/1000,
 281                GET_BE_U_4(nh->msys_uptime)%1000,
 282                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 283
 284         ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
 285         nr = (const struct nfrec_v5 *)&nh[1];
 286
 287         ND_PRINT("%2u recs", nrecs);
 288
 289         for (; nrecs != 0; nr++, nrecs--) {
 290                 char buf[20];
 291                 char asbuf[20];
 292
 293                 /*
 294                  * Make sure we have the entire record.
 295                  */
 296                 ND_TCHECK_SIZE(nr);
 297                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 298                        GET_BE_U_4(nr->start_time)/1000,
 299                        GET_BE_U_4(nr->start_time)%1000,
 300                        GET_BE_U_4(nr->last_time)/1000,
 301                        GET_BE_U_4(nr->last_time)%1000);
 302
 303                 asbuf[0] = buf[0] = '\0';
 304                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->src_mask));
 305                 snprintf(asbuf, sizeof(asbuf), ":%u",
 306                         GET_BE_U_2(nr->src_as));
 307                 ND_PRINT("\n    %s%s%s:%u ",
 308                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 309                         buf, asbuf,
 310                         GET_BE_U_2(nr->srcport));
 311
 312                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->dst_mask));
 313                 snprintf(asbuf, sizeof(asbuf), ":%u",
 314                          GET_BE_U_2(nr->dst_as));
 315                 ND_PRINT("> %s%s%s:%u ",
 316                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 317                         buf, asbuf,
 318                         GET_BE_U_2(nr->dstport));
 319
 320                 ND_PRINT(">> %s\n    ",
 321                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 322
 323                 proto = GET_U_1(nr->proto);
 324                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 325                         ND_PRINT("%s ", p_name);
 326                 else
 327                         ND_PRINT("%u ", proto);
 328
 329                 /* tcp flags for tcp only */
 330                 if (proto == IPPROTO_TCP) {
 331                         u_int flags;
 332                         flags = GET_U_1(nr->tcp_flags);
 333                         ND_PRINT("%s%s%s%s%s%s%s",
 334                                 flags & TH_FIN  ? "F" : "",
 335                                 flags & TH_SYN  ? "S" : "",
 336                                 flags & TH_RST  ? "R" : "",
 337                                 flags & TH_PUSH ? "P" : "",
 338                                 flags & TH_ACK  ? "A" : "",
 339                                 flags & TH_URG  ? "U" : "",
 340                                 flags           ? " " : "");
 341                 }
 342
 343                 buf[0]='\0';
 344                 ND_PRINT("tos %u, %u (%u octets) %s",
 345                        GET_U_1(nr->tos),
 346                        GET_BE_U_4(nr->packets),
 347                        GET_BE_U_4(nr->octets), buf);
 348         }
 349         return;
 350
 351 trunc:
 352         nd_print_trunc(ndo);
 353         return;
 354 }
 355
 356 static void
 357 cnfp_v6_print(netdissect_options *ndo, const u_char *cp)
 358 {
 359         const struct nfhdr_v6 *nh;
 360         const struct nfrec_v6 *nr;
 361         const char *p_name;
 362         uint8_t proto;
 363         u_int nrecs, ver;
 364 #if 0
 365         time_t t;
 366 #endif
 367
 368         nh = (const struct nfhdr_v6 *)cp;
 369         ND_TCHECK_SIZE(nh);
 370
 371         ver = GET_BE_U_2(nh->version);
 372         nrecs = GET_BE_U_4(nh->count);
 373 #if 0
 374         /*
 375          * This is seconds since the UN*X epoch, and is followed by
 376          * nanoseconds.  XXX - format it, rather than just dumping the
 377          * raw seconds-since-the-Epoch.
 378          */
 379         t = GET_BE_U_4(nh->utc_sec);
 380 #endif
 381
 382         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 383                GET_BE_U_4(nh->msys_uptime)/1000,
 384                GET_BE_U_4(nh->msys_uptime)%1000,
 385                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 386
 387         ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
 388         nr = (const struct nfrec_v6 *)&nh[1];
 389
 390         ND_PRINT("%2u recs", nrecs);
 391
 392         for (; nrecs != 0; nr++, nrecs--) {
 393                 char buf[20];
 394                 char asbuf[20];
 395
 396                 /*
 397                  * Make sure we have the entire record.
 398                  */
 399                 ND_TCHECK_SIZE(nr);
 400                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 401                        GET_BE_U_4(nr->start_time)/1000,
 402                        GET_BE_U_4(nr->start_time)%1000,
 403                        GET_BE_U_4(nr->last_time)/1000,
 404                        GET_BE_U_4(nr->last_time)%1000);
 405
 406                 asbuf[0] = buf[0] = '\0';
 407                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->src_mask));
 408                 snprintf(asbuf, sizeof(asbuf), ":%u",
 409                         GET_BE_U_2(nr->src_as));
 410                 ND_PRINT("\n    %s%s%s:%u ",
 411                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 412                         buf, asbuf,
 413                         GET_BE_U_2(nr->srcport));
 414
 415                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->dst_mask));
 416                 snprintf(asbuf, sizeof(asbuf), ":%u",
 417                          GET_BE_U_2(nr->dst_as));
 418                 ND_PRINT("> %s%s%s:%u ",
 419                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 420                         buf, asbuf,
 421                         GET_BE_U_2(nr->dstport));
 422
 423                 ND_PRINT(">> %s\n    ",
 424                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 425
 426                 proto = GET_U_1(nr->proto);
 427                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 428                         ND_PRINT("%s ", p_name);
 429                 else
 430                         ND_PRINT("%u ", proto);
 431
 432                 /* tcp flags for tcp only */
 433                 if (proto == IPPROTO_TCP) {
 434                         u_int flags;
 435                         flags = GET_U_1(nr->tcp_flags);
 436                         ND_PRINT("%s%s%s%s%s%s%s",
 437                                 flags & TH_FIN  ? "F" : "",
 438                                 flags & TH_SYN  ? "S" : "",
 439                                 flags & TH_RST  ? "R" : "",
 440                                 flags & TH_PUSH ? "P" : "",
 441                                 flags & TH_ACK  ? "A" : "",
 442                                 flags & TH_URG  ? "U" : "",
 443                                 flags           ? " " : "");
 444                 }
 445
 446                 buf[0]='\0';
 447                 snprintf(buf, sizeof(buf), "(%u<>%u encaps)",
 448                          (GET_BE_U_2(nr->flags) >> 8) & 0xff,
 449                          (GET_BE_U_2(nr->flags)) & 0xff);
 450                 ND_PRINT("tos %u, %u (%u octets) %s",
 451                        GET_U_1(nr->tos),
 452                        GET_BE_U_4(nr->packets),
 453                        GET_BE_U_4(nr->octets), buf);
 454         }
 455         return;
 456
 457 trunc:
 458         nd_print_trunc(ndo);
 459         return;
 460 }
 461
 462 void
 463 cnfp_print(netdissect_options *ndo, const u_char *cp)
 464 {
 465         int ver;
 466
 467         /*
 468          * First 2 bytes are the version number.
 469          */
 470         ndo->ndo_protocol = "cnfp";
 471         ver = GET_BE_U_2(cp);
 472         switch (ver) {
 473
 474         case 1:
 475                 cnfp_v1_print(ndo, cp);
 476                 break;
 477
 478         case 5:
 479                 cnfp_v5_print(ndo, cp);
 480                 break;
 481
 482         case 6:
 483                 cnfp_v6_print(ndo, cp);
 484                 break;
 485
 486         default:
 487                 ND_PRINT("NetFlow v%x", ver);
 488                 break;
 489         }
 490 }