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