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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 #include <config.h>
  44
  45 #include "netdissect-stdinc.h"
  46
  47 #include <stdio.h>
  48
  49 #include "netdissect.h"
  50 #include "addrtoname.h"
  51 #include "extract.h"
  52
  53 #include "tcp.h"
  54 #include "ipproto.h"
  55
  56 struct nfhdr_v1 {
  57         nd_uint16_t     version;        /* version number */
  58         nd_uint16_t     count;          /* # of records */
  59         nd_uint32_t     msys_uptime;
  60         nd_uint32_t     utc_sec;
  61         nd_uint32_t     utc_nsec;
  62 };
  63
  64 struct nfrec_v1 {
  65         nd_ipv4         src_ina;
  66         nd_ipv4         dst_ina;
  67         nd_ipv4         nhop_ina;
  68         nd_uint16_t     input;          /* SNMP index of input interface */
  69         nd_uint16_t     output;         /* SNMP index of output interface */
  70         nd_uint32_t     packets;        /* packets in the flow */
  71         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
  72         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
  73         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
  74         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
  75         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
  76         nd_byte         pad1[2];        /* pad */
  77         nd_uint8_t      proto;          /* IP protocol type */
  78         nd_uint8_t      tos;            /* IP type of service */
  79         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
  80         nd_byte         pad[3];         /* padding */
  81         nd_uint32_t     reserved;       /* unused */
  82 };
  83
  84 struct nfhdr_v5 {
  85         nd_uint16_t     version;        /* version number */
  86         nd_uint16_t     count;          /* # of records */
  87         nd_uint32_t     msys_uptime;
  88         nd_uint32_t     utc_sec;
  89         nd_uint32_t     utc_nsec;
  90         nd_uint32_t     sequence;       /* flow sequence number */
  91         nd_uint8_t      engine_type;    /* type of flow-switching engine */
  92         nd_uint8_t      engine_id;      /* slot number of the flow-switching engine */
  93         nd_uint16_t     sampling_interval; /* sampling mode and interval */
  94 };
  95
  96 struct nfrec_v5 {
  97         nd_ipv4         src_ina;
  98         nd_ipv4         dst_ina;
  99         nd_ipv4         nhop_ina;
 100         nd_uint16_t     input;          /* SNMP index of input interface */
 101         nd_uint16_t     output;         /* SNMP index of output interface */
 102         nd_uint32_t     packets;        /* packets in the flow */
 103         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
 104         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
 105         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
 106         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
 107         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
 108         nd_byte         pad1;           /* pad */
 109         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
 110         nd_uint8_t      proto;          /* IP protocol type */
 111         nd_uint8_t      tos;            /* IP type of service */
 112         nd_uint16_t     src_as;         /* AS number of the source */
 113         nd_uint16_t     dst_as;         /* AS number of the destination */
 114         nd_uint8_t      src_mask;       /* source address mask bits */
 115         nd_uint8_t      dst_mask;       /* destination address prefix mask bits */
 116         nd_byte         pad2[2];
 117         nd_ipv4         peer_nexthop;   /* v6: IP address of the nexthop within the peer (FIB)*/
 118 };
 119
 120 struct nfhdr_v6 {
 121         nd_uint16_t     version;        /* version number */
 122         nd_uint16_t     count;          /* # of records */
 123         nd_uint32_t     msys_uptime;
 124         nd_uint32_t     utc_sec;
 125         nd_uint32_t     utc_nsec;
 126         nd_uint32_t     sequence;       /* v5 flow sequence number */
 127         nd_uint32_t     reserved;       /* v5 only */
 128 };
 129
 130 struct nfrec_v6 {
 131         nd_ipv4         src_ina;
 132         nd_ipv4         dst_ina;
 133         nd_ipv4         nhop_ina;
 134         nd_uint16_t     input;          /* SNMP index of input interface */
 135         nd_uint16_t     output;         /* SNMP index of output interface */
 136         nd_uint32_t     packets;        /* packets in the flow */
 137         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
 138         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
 139         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
 140         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
 141         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
 142         nd_byte         pad1;           /* pad */
 143         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
 144         nd_uint8_t      proto;          /* IP protocol type */
 145         nd_uint8_t      tos;            /* IP type of service */
 146         nd_uint16_t     src_as;         /* AS number of the source */
 147         nd_uint16_t     dst_as;         /* AS number of the destination */
 148         nd_uint8_t      src_mask;       /* source address mask bits */
 149         nd_uint8_t      dst_mask;       /* destination address prefix mask bits */
 150         nd_uint16_t     flags;
 151         nd_ipv4         peer_nexthop;   /* v6: IP address of the nexthop within the peer (FIB)*/
 152 };
 153
 154 static void
 155 cnfp_v1_print(netdissect_options *ndo, const u_char *cp)
 156 {
 157         const struct nfhdr_v1 *nh;
 158         const struct nfrec_v1 *nr;
 159         const char *p_name;
 160         uint8_t proto;
 161         u_int nrecs, ver;
 162 #if 0
 163         time_t t;
 164 #endif
 165
 166         nh = (const struct nfhdr_v1 *)cp;
 167         ND_TCHECK_SIZE(nh);
 168
 169         ver = GET_BE_U_2(nh->version);
 170         nrecs = GET_BE_U_4(nh->count);
 171 #if 0
 172         /*
 173          * This is seconds since the UN*X epoch, and is followed by
 174          * nanoseconds.  XXX - format it, rather than just dumping the
 175          * raw seconds-since-the-Epoch.
 176          */
 177         t = GET_BE_U_4(nh->utc_sec);
 178 #endif
 179
 180         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 181                GET_BE_U_4(nh->msys_uptime)/1000,
 182                GET_BE_U_4(nh->msys_uptime)%1000,
 183                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 184
 185         nr = (const struct nfrec_v1 *)&nh[1];
 186
 187         ND_PRINT("%2u recs", nrecs);
 188
 189         for (; nrecs != 0; nr++, nrecs--) {
 190                 char buf[20];
 191                 char asbuf[20];
 192
 193                 /*
 194                  * Make sure we have the entire record.
 195                  */
 196                 ND_TCHECK_SIZE(nr);
 197                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 198                        GET_BE_U_4(nr->start_time)/1000,
 199                        GET_BE_U_4(nr->start_time)%1000,
 200                        GET_BE_U_4(nr->last_time)/1000,
 201                        GET_BE_U_4(nr->last_time)%1000);
 202
 203                 asbuf[0] = buf[0] = '\0';
 204                 ND_PRINT("\n    %s%s%s:%u ",
 205                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 206                         buf, asbuf,
 207                         GET_BE_U_2(nr->srcport));
 208
 209                 ND_PRINT("> %s%s%s:%u ",
 210                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 211                         buf, asbuf,
 212                         GET_BE_U_2(nr->dstport));
 213
 214                 ND_PRINT(">> %s\n    ",
 215                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 216
 217                 proto = GET_U_1(nr->proto);
 218                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 219                         ND_PRINT("%s ", p_name);
 220                 else
 221                         ND_PRINT("%u ", proto);
 222
 223                 /* tcp flags for tcp only */
 224                 if (proto == IPPROTO_TCP) {
 225                         u_int flags;
 226                         flags = GET_U_1(nr->tcp_flags);
 227                         ND_PRINT("%s%s%s%s%s%s%s",
 228                                 flags & TH_FIN  ? "F" : "",
 229                                 flags & TH_SYN  ? "S" : "",
 230                                 flags & TH_RST  ? "R" : "",
 231                                 flags & TH_PUSH ? "P" : "",
 232                                 flags & TH_ACK  ? "A" : "",
 233                                 flags & TH_URG  ? "U" : "",
 234                                 flags           ? " " : "");
 235                 }
 236
 237                 buf[0]='\0';
 238                 ND_PRINT("tos %u, %u (%u octets) %s",
 239                        GET_U_1(nr->tos),
 240                        GET_BE_U_4(nr->packets),
 241                        GET_BE_U_4(nr->octets), buf);
 242         }
 243         return;
 244
 245 trunc:
 246         nd_print_trunc(ndo);
 247 }
 248
 249 static void
 250 cnfp_v5_print(netdissect_options *ndo, const u_char *cp)
 251 {
 252         const struct nfhdr_v5 *nh;
 253         const struct nfrec_v5 *nr;
 254         const char *p_name;
 255         uint8_t proto;
 256         u_int nrecs, ver;
 257 #if 0
 258         time_t t;
 259 #endif
 260
 261         nh = (const struct nfhdr_v5 *)cp;
 262         ND_TCHECK_SIZE(nh);
 263
 264         ver = GET_BE_U_2(nh->version);
 265         nrecs = GET_BE_U_4(nh->count);
 266 #if 0
 267         /*
 268          * This is seconds since the UN*X epoch, and is followed by
 269          * nanoseconds.  XXX - format it, rather than just dumping the
 270          * raw seconds-since-the-Epoch.
 271          */
 272         t = GET_BE_U_4(nh->utc_sec);
 273 #endif
 274
 275         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 276                GET_BE_U_4(nh->msys_uptime)/1000,
 277                GET_BE_U_4(nh->msys_uptime)%1000,
 278                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 279
 280         ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
 281         nr = (const struct nfrec_v5 *)&nh[1];
 282
 283         ND_PRINT("%2u recs", nrecs);
 284
 285         for (; nrecs != 0; nr++, nrecs--) {
 286                 char buf[20];
 287                 char asbuf[20];
 288
 289                 /*
 290                  * Make sure we have the entire record.
 291                  */
 292                 ND_TCHECK_SIZE(nr);
 293                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 294                        GET_BE_U_4(nr->start_time)/1000,
 295                        GET_BE_U_4(nr->start_time)%1000,
 296                        GET_BE_U_4(nr->last_time)/1000,
 297                        GET_BE_U_4(nr->last_time)%1000);
 298
 299                 asbuf[0] = buf[0] = '\0';
 300                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->src_mask));
 301                 snprintf(asbuf, sizeof(asbuf), ":%u",
 302                         GET_BE_U_2(nr->src_as));
 303                 ND_PRINT("\n    %s%s%s:%u ",
 304                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 305                         buf, asbuf,
 306                         GET_BE_U_2(nr->srcport));
 307
 308                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->dst_mask));
 309                 snprintf(asbuf, sizeof(asbuf), ":%u",
 310                          GET_BE_U_2(nr->dst_as));
 311                 ND_PRINT("> %s%s%s:%u ",
 312                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 313                         buf, asbuf,
 314                         GET_BE_U_2(nr->dstport));
 315
 316                 ND_PRINT(">> %s\n    ",
 317                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 318
 319                 proto = GET_U_1(nr->proto);
 320                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 321                         ND_PRINT("%s ", p_name);
 322                 else
 323                         ND_PRINT("%u ", proto);
 324
 325                 /* tcp flags for tcp only */
 326                 if (proto == IPPROTO_TCP) {
 327                         u_int flags;
 328                         flags = GET_U_1(nr->tcp_flags);
 329                         ND_PRINT("%s%s%s%s%s%s%s",
 330                                 flags & TH_FIN  ? "F" : "",
 331                                 flags & TH_SYN  ? "S" : "",
 332                                 flags & TH_RST  ? "R" : "",
 333                                 flags & TH_PUSH ? "P" : "",
 334                                 flags & TH_ACK  ? "A" : "",
 335                                 flags & TH_URG  ? "U" : "",
 336                                 flags           ? " " : "");
 337                 }
 338
 339                 buf[0]='\0';
 340                 ND_PRINT("tos %u, %u (%u octets) %s",
 341                        GET_U_1(nr->tos),
 342                        GET_BE_U_4(nr->packets),
 343                        GET_BE_U_4(nr->octets), buf);
 344         }
 345         return;
 346
 347 trunc:
 348         nd_print_trunc(ndo);
 349 }
 350
 351 static void
 352 cnfp_v6_print(netdissect_options *ndo, const u_char *cp)
 353 {
 354         const struct nfhdr_v6 *nh;
 355         const struct nfrec_v6 *nr;
 356         const char *p_name;
 357         uint8_t proto;
 358         u_int nrecs, ver;
 359 #if 0
 360         time_t t;
 361 #endif
 362
 363         nh = (const struct nfhdr_v6 *)cp;
 364         ND_TCHECK_SIZE(nh);
 365
 366         ver = GET_BE_U_2(nh->version);
 367         nrecs = GET_BE_U_4(nh->count);
 368 #if 0
 369         /*
 370          * This is seconds since the UN*X epoch, and is followed by
 371          * nanoseconds.  XXX - format it, rather than just dumping the
 372          * raw seconds-since-the-Epoch.
 373          */
 374         t = GET_BE_U_4(nh->utc_sec);
 375 #endif
 376
 377         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 378                GET_BE_U_4(nh->msys_uptime)/1000,
 379                GET_BE_U_4(nh->msys_uptime)%1000,
 380                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 381
 382         ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
 383         nr = (const struct nfrec_v6 *)&nh[1];
 384
 385         ND_PRINT("%2u recs", nrecs);
 386
 387         for (; nrecs != 0; nr++, nrecs--) {
 388                 char buf[20];
 389                 char asbuf[20];
 390
 391                 /*
 392                  * Make sure we have the entire record.
 393                  */
 394                 ND_TCHECK_SIZE(nr);
 395                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 396                        GET_BE_U_4(nr->start_time)/1000,
 397                        GET_BE_U_4(nr->start_time)%1000,
 398                        GET_BE_U_4(nr->last_time)/1000,
 399                        GET_BE_U_4(nr->last_time)%1000);
 400
 401                 asbuf[0] = buf[0] = '\0';
 402                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->src_mask));
 403                 snprintf(asbuf, sizeof(asbuf), ":%u",
 404                         GET_BE_U_2(nr->src_as));
 405                 ND_PRINT("\n    %s%s%s:%u ",
 406                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 407                         buf, asbuf,
 408                         GET_BE_U_2(nr->srcport));
 409
 410                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->dst_mask));
 411                 snprintf(asbuf, sizeof(asbuf), ":%u",
 412                          GET_BE_U_2(nr->dst_as));
 413                 ND_PRINT("> %s%s%s:%u ",
 414                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 415                         buf, asbuf,
 416                         GET_BE_U_2(nr->dstport));
 417
 418                 ND_PRINT(">> %s\n    ",
 419                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 420
 421                 proto = GET_U_1(nr->proto);
 422                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 423                         ND_PRINT("%s ", p_name);
 424                 else
 425                         ND_PRINT("%u ", proto);
 426
 427                 /* tcp flags for tcp only */
 428                 if (proto == IPPROTO_TCP) {
 429                         u_int flags;
 430                         flags = GET_U_1(nr->tcp_flags);
 431                         ND_PRINT("%s%s%s%s%s%s%s",
 432                                 flags & TH_FIN  ? "F" : "",
 433                                 flags & TH_SYN  ? "S" : "",
 434                                 flags & TH_RST  ? "R" : "",
 435                                 flags & TH_PUSH ? "P" : "",
 436                                 flags & TH_ACK  ? "A" : "",
 437                                 flags & TH_URG  ? "U" : "",
 438                                 flags           ? " " : "");
 439                 }
 440
 441                 buf[0]='\0';
 442                 snprintf(buf, sizeof(buf), "(%u<>%u encaps)",
 443                          (GET_BE_U_2(nr->flags) >> 8) & 0xff,
 444                          (GET_BE_U_2(nr->flags)) & 0xff);
 445                 ND_PRINT("tos %u, %u (%u octets) %s",
 446                        GET_U_1(nr->tos),
 447                        GET_BE_U_4(nr->packets),
 448                        GET_BE_U_4(nr->octets), buf);
 449         }
 450         return;
 451
 452 trunc:
 453         nd_print_trunc(ndo);
 454 }
 455
 456 void
 457 cnfp_print(netdissect_options *ndo, const u_char *cp)
 458 {
 459         int ver;
 460
 461         /*
 462          * First 2 bytes are the version number.
 463          */
 464         ndo->ndo_protocol = "cnfp";
 465         ver = GET_BE_U_2(cp);
 466         switch (ver) {
 467
 468         case 1:
 469                 cnfp_v1_print(ndo, cp);
 470                 break;
 471
 472         case 5:
 473                 cnfp_v5_print(ndo, cp);
 474                 break;
 475
 476         case 6:
 477                 cnfp_v6_print(ndo, cp);
 478                 break;
 479
 480         default:
 481                 ND_PRINT("NetFlow v%x", ver);
 482                 break;
 483         }
 484 }