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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
  51 #include "netdissect.h"
  52 #include "addrtoname.h"
  53 #include "extract.h"
  54
  55 #include "tcp.h"
  56 #include "ipproto.h"
  57
  58 struct nfhdr_v1 {
  59         nd_uint16_t     version;        /* version number */
  60         nd_uint16_t     count;          /* # of records */
  61         nd_uint32_t     msys_uptime;
  62         nd_uint32_t     utc_sec;
  63         nd_uint32_t     utc_nsec;
  64 };
  65
  66 struct nfrec_v1 {
  67         nd_ipv4         src_ina;
  68         nd_ipv4         dst_ina;
  69         nd_ipv4         nhop_ina;
  70         nd_uint16_t     input;          /* SNMP index of input interface */
  71         nd_uint16_t     output;         /* SNMP index of output interface */
  72         nd_uint32_t     packets;        /* packets in the flow */
  73         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
  74         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
  75         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
  76         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
  77         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
  78         nd_byte         pad1[2];        /* pad */
  79         nd_uint8_t      proto;          /* IP protocol type */
  80         nd_uint8_t      tos;            /* IP type of service */
  81         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
  82         nd_byte         pad[3];         /* padding */
  83         nd_uint32_t     reserved;       /* unused */
  84 };
  85
  86 struct nfhdr_v5 {
  87         nd_uint16_t     version;        /* version number */
  88         nd_uint16_t     count;          /* # of records */
  89         nd_uint32_t     msys_uptime;
  90         nd_uint32_t     utc_sec;
  91         nd_uint32_t     utc_nsec;
  92         nd_uint32_t     sequence;       /* flow sequence number */
  93         nd_uint8_t      engine_type;    /* type of flow-switching engine */
  94         nd_uint8_t      engine_id;      /* slot number of the flow-switching engine */
  95         nd_uint16_t     sampling_interval; /* sampling mode and interval */
  96 };
  97
  98 struct nfrec_v5 {
  99         nd_ipv4         src_ina;
 100         nd_ipv4         dst_ina;
 101         nd_ipv4         nhop_ina;
 102         nd_uint16_t     input;          /* SNMP index of input interface */
 103         nd_uint16_t     output;         /* SNMP index of output interface */
 104         nd_uint32_t     packets;        /* packets in the flow */
 105         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
 106         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
 107         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
 108         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
 109         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
 110         nd_byte         pad1;           /* pad */
 111         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
 112         nd_uint8_t      proto;          /* IP protocol type */
 113         nd_uint8_t      tos;            /* IP type of service */
 114         nd_uint16_t     src_as;         /* AS number of the source */
 115         nd_uint16_t     dst_as;         /* AS number of the destination */
 116         nd_uint8_t      src_mask;       /* source address mask bits */
 117         nd_uint8_t      dst_mask;       /* destination address prefix mask bits */
 118         nd_byte         pad2[2];
 119         nd_ipv4         peer_nexthop;   /* v6: IP address of the nexthop within the peer (FIB)*/
 120 };
 121
 122 struct nfhdr_v6 {
 123         nd_uint16_t     version;        /* version number */
 124         nd_uint16_t     count;          /* # of records */
 125         nd_uint32_t     msys_uptime;
 126         nd_uint32_t     utc_sec;
 127         nd_uint32_t     utc_nsec;
 128         nd_uint32_t     sequence;       /* v5 flow sequence number */
 129         nd_uint32_t     reserved;       /* v5 only */
 130 };
 131
 132 struct nfrec_v6 {
 133         nd_ipv4         src_ina;
 134         nd_ipv4         dst_ina;
 135         nd_ipv4         nhop_ina;
 136         nd_uint16_t     input;          /* SNMP index of input interface */
 137         nd_uint16_t     output;         /* SNMP index of output interface */
 138         nd_uint32_t     packets;        /* packets in the flow */
 139         nd_uint32_t     octets;         /* layer 3 octets in the packets of the flow */
 140         nd_uint32_t     start_time;     /* sys_uptime value at start of flow */
 141         nd_uint32_t     last_time;      /* sys_uptime value when last packet of flow was received */
 142         nd_uint16_t     srcport;        /* TCP/UDP source port or equivalent */
 143         nd_uint16_t     dstport;        /* TCP/UDP source port or equivalent */
 144         nd_byte         pad1;           /* pad */
 145         nd_uint8_t      tcp_flags;      /* cumulative OR of TCP flags */
 146         nd_uint8_t      proto;          /* IP protocol type */
 147         nd_uint8_t      tos;            /* IP type of service */
 148         nd_uint16_t     src_as;         /* AS number of the source */
 149         nd_uint16_t     dst_as;         /* AS number of the destination */
 150         nd_uint8_t      src_mask;       /* source address mask bits */
 151         nd_uint8_t      dst_mask;       /* destination address prefix mask bits */
 152         nd_uint16_t     flags;
 153         nd_ipv4         peer_nexthop;   /* v6: IP address of the nexthop within the peer (FIB)*/
 154 };
 155
 156 static void
 157 cnfp_v1_print(netdissect_options *ndo, const u_char *cp)
 158 {
 159         const struct nfhdr_v1 *nh;
 160         const struct nfrec_v1 *nr;
 161         const char *p_name;
 162         uint8_t proto;
 163         u_int nrecs, ver;
 164 #if 0
 165         time_t t;
 166 #endif
 167
 168         nh = (const struct nfhdr_v1 *)cp;
 169         ND_TCHECK_SIZE(nh);
 170
 171         ver = GET_BE_U_2(nh->version);
 172         nrecs = GET_BE_U_4(nh->count);
 173 #if 0
 174         /*
 175          * This is seconds since the UN*X epoch, and is followed by
 176          * nanoseconds.  XXX - format it, rather than just dumping the
 177          * raw seconds-since-the-Epoch.
 178          */
 179         t = GET_BE_U_4(nh->utc_sec);
 180 #endif
 181
 182         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 183                GET_BE_U_4(nh->msys_uptime)/1000,
 184                GET_BE_U_4(nh->msys_uptime)%1000,
 185                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 186
 187         nr = (const struct nfrec_v1 *)&nh[1];
 188
 189         ND_PRINT("%2u recs", nrecs);
 190
 191         for (; nrecs != 0; nr++, nrecs--) {
 192                 char buf[20];
 193                 char asbuf[20];
 194
 195                 /*
 196                  * Make sure we have the entire record.
 197                  */
 198                 ND_TCHECK_SIZE(nr);
 199                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 200                        GET_BE_U_4(nr->start_time)/1000,
 201                        GET_BE_U_4(nr->start_time)%1000,
 202                        GET_BE_U_4(nr->last_time)/1000,
 203                        GET_BE_U_4(nr->last_time)%1000);
 204
 205                 asbuf[0] = buf[0] = '\0';
 206                 ND_PRINT("\n    %s%s%s:%u ",
 207                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 208                         buf, asbuf,
 209                         GET_BE_U_2(nr->srcport));
 210
 211                 ND_PRINT("> %s%s%s:%u ",
 212                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 213                         buf, asbuf,
 214                         GET_BE_U_2(nr->dstport));
 215
 216                 ND_PRINT(">> %s\n    ",
 217                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 218
 219                 proto = GET_U_1(nr->proto);
 220                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 221                         ND_PRINT("%s ", p_name);
 222                 else
 223                         ND_PRINT("%u ", proto);
 224
 225                 /* tcp flags for tcp only */
 226                 if (proto == IPPROTO_TCP) {
 227                         u_int flags;
 228                         flags = GET_U_1(nr->tcp_flags);
 229                         if (flags)
 230                                 ND_PRINT("%s ", bittok2str_nosep(tcp_flag_values, "", flags));
 231                 }
 232
 233                 buf[0]='\0';
 234                 ND_PRINT("tos %u, %u (%u octets) %s",
 235                        GET_U_1(nr->tos),
 236                        GET_BE_U_4(nr->packets),
 237                        GET_BE_U_4(nr->octets), buf);
 238         }
 239         return;
 240
 241 trunc:
 242         nd_print_trunc(ndo);
 243 }
 244
 245 static void
 246 cnfp_v5_print(netdissect_options *ndo, const u_char *cp)
 247 {
 248         const struct nfhdr_v5 *nh;
 249         const struct nfrec_v5 *nr;
 250         const char *p_name;
 251         uint8_t proto;
 252         u_int nrecs, ver;
 253 #if 0
 254         time_t t;
 255 #endif
 256
 257         nh = (const struct nfhdr_v5 *)cp;
 258         ND_TCHECK_SIZE(nh);
 259
 260         ver = GET_BE_U_2(nh->version);
 261         nrecs = GET_BE_U_4(nh->count);
 262 #if 0
 263         /*
 264          * This is seconds since the UN*X epoch, and is followed by
 265          * nanoseconds.  XXX - format it, rather than just dumping the
 266          * raw seconds-since-the-Epoch.
 267          */
 268         t = GET_BE_U_4(nh->utc_sec);
 269 #endif
 270
 271         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 272                GET_BE_U_4(nh->msys_uptime)/1000,
 273                GET_BE_U_4(nh->msys_uptime)%1000,
 274                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 275
 276         ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
 277         nr = (const struct nfrec_v5 *)&nh[1];
 278
 279         ND_PRINT("%2u recs", nrecs);
 280
 281         for (; nrecs != 0; nr++, nrecs--) {
 282                 char buf[20];
 283                 char asbuf[20];
 284
 285                 /*
 286                  * Make sure we have the entire record.
 287                  */
 288                 ND_TCHECK_SIZE(nr);
 289                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 290                        GET_BE_U_4(nr->start_time)/1000,
 291                        GET_BE_U_4(nr->start_time)%1000,
 292                        GET_BE_U_4(nr->last_time)/1000,
 293                        GET_BE_U_4(nr->last_time)%1000);
 294
 295                 asbuf[0] = buf[0] = '\0';
 296                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->src_mask));
 297                 snprintf(asbuf, sizeof(asbuf), ":%u",
 298                         GET_BE_U_2(nr->src_as));
 299                 ND_PRINT("\n    %s%s%s:%u ",
 300                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 301                         buf, asbuf,
 302                         GET_BE_U_2(nr->srcport));
 303
 304                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->dst_mask));
 305                 snprintf(asbuf, sizeof(asbuf), ":%u",
 306                          GET_BE_U_2(nr->dst_as));
 307                 ND_PRINT("> %s%s%s:%u ",
 308                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 309                         buf, asbuf,
 310                         GET_BE_U_2(nr->dstport));
 311
 312                 ND_PRINT(">> %s\n    ",
 313                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 314
 315                 proto = GET_U_1(nr->proto);
 316                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 317                         ND_PRINT("%s ", p_name);
 318                 else
 319                         ND_PRINT("%u ", proto);
 320
 321                 /* tcp flags for tcp only */
 322                 if (proto == IPPROTO_TCP) {
 323                         u_int flags;
 324                         flags = GET_U_1(nr->tcp_flags);
 325                         if (flags)
 326                                 ND_PRINT("%s ", bittok2str_nosep(tcp_flag_values, "", flags));
 327                 }
 328
 329                 buf[0]='\0';
 330                 ND_PRINT("tos %u, %u (%u octets) %s",
 331                        GET_U_1(nr->tos),
 332                        GET_BE_U_4(nr->packets),
 333                        GET_BE_U_4(nr->octets), buf);
 334         }
 335         return;
 336
 337 trunc:
 338         nd_print_trunc(ndo);
 339 }
 340
 341 static void
 342 cnfp_v6_print(netdissect_options *ndo, const u_char *cp)
 343 {
 344         const struct nfhdr_v6 *nh;
 345         const struct nfrec_v6 *nr;
 346         const char *p_name;
 347         uint8_t proto;
 348         u_int nrecs, ver;
 349 #if 0
 350         time_t t;
 351 #endif
 352
 353         nh = (const struct nfhdr_v6 *)cp;
 354         ND_TCHECK_SIZE(nh);
 355
 356         ver = GET_BE_U_2(nh->version);
 357         nrecs = GET_BE_U_4(nh->count);
 358 #if 0
 359         /*
 360          * This is seconds since the UN*X epoch, and is followed by
 361          * nanoseconds.  XXX - format it, rather than just dumping the
 362          * raw seconds-since-the-Epoch.
 363          */
 364         t = GET_BE_U_4(nh->utc_sec);
 365 #endif
 366
 367         ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
 368                GET_BE_U_4(nh->msys_uptime)/1000,
 369                GET_BE_U_4(nh->msys_uptime)%1000,
 370                GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
 371
 372         ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
 373         nr = (const struct nfrec_v6 *)&nh[1];
 374
 375         ND_PRINT("%2u recs", nrecs);
 376
 377         for (; nrecs != 0; nr++, nrecs--) {
 378                 char buf[20];
 379                 char asbuf[20];
 380
 381                 /*
 382                  * Make sure we have the entire record.
 383                  */
 384                 ND_TCHECK_SIZE(nr);
 385                 ND_PRINT("\n  started %u.%03u, last %u.%03u",
 386                        GET_BE_U_4(nr->start_time)/1000,
 387                        GET_BE_U_4(nr->start_time)%1000,
 388                        GET_BE_U_4(nr->last_time)/1000,
 389                        GET_BE_U_4(nr->last_time)%1000);
 390
 391                 asbuf[0] = buf[0] = '\0';
 392                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->src_mask));
 393                 snprintf(asbuf, sizeof(asbuf), ":%u",
 394                         GET_BE_U_2(nr->src_as));
 395                 ND_PRINT("\n    %s%s%s:%u ",
 396                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
 397                         buf, asbuf,
 398                         GET_BE_U_2(nr->srcport));
 399
 400                 snprintf(buf, sizeof(buf), "/%u", GET_U_1(nr->dst_mask));
 401                 snprintf(asbuf, sizeof(asbuf), ":%u",
 402                          GET_BE_U_2(nr->dst_as));
 403                 ND_PRINT("> %s%s%s:%u ",
 404                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
 405                         buf, asbuf,
 406                         GET_BE_U_2(nr->dstport));
 407
 408                 ND_PRINT(">> %s\n    ",
 409                         intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
 410
 411                 proto = GET_U_1(nr->proto);
 412                 if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
 413                         ND_PRINT("%s ", p_name);
 414                 else
 415                         ND_PRINT("%u ", proto);
 416
 417                 /* tcp flags for tcp only */
 418                 if (proto == IPPROTO_TCP) {
 419                         u_int flags;
 420                         flags = GET_U_1(nr->tcp_flags);
 421                         if (flags)
 422                                 ND_PRINT("%s ", bittok2str_nosep(tcp_flag_values, "", flags));
 423                 }
 424
 425                 buf[0]='\0';
 426                 snprintf(buf, sizeof(buf), "(%u<>%u encaps)",
 427                          (GET_BE_U_2(nr->flags) >> 8) & 0xff,
 428                          (GET_BE_U_2(nr->flags)) & 0xff);
 429                 ND_PRINT("tos %u, %u (%u octets) %s",
 430                        GET_U_1(nr->tos),
 431                        GET_BE_U_4(nr->packets),
 432                        GET_BE_U_4(nr->octets), buf);
 433         }
 434         return;
 435
 436 trunc:
 437         nd_print_trunc(ndo);
 438 }
 439
 440 void
 441 cnfp_print(netdissect_options *ndo, const u_char *cp)
 442 {
 443         int ver;
 444
 445         /*
 446          * First 2 bytes are the version number.
 447          */
 448         ndo->ndo_protocol = "cnfp";
 449         ver = GET_BE_U_2(cp);
 450         switch (ver) {
 451
 452         case 1:
 453                 cnfp_v1_print(ndo, cp);
 454                 break;
 455
 456         case 5:
 457                 cnfp_v5_print(ndo, cp);
 458                 break;
 459
 460         case 6:
 461                 cnfp_v6_print(ndo, cp);
 462                 break;
 463
 464         default:
 465                 ND_PRINT("NetFlow v%x", ver);
 466                 break;
 467         }
 468 }