nexmon – Rev 1
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/* $OpenBSD: print-cnfp.c,v 1.2 1998/06/25 20:26:59 mickey Exp $ */
/*
* Copyright (c) 1998 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Michael Shalayeff.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Cisco NetFlow protocol
*
* See
*
* http://www.cisco.com/c/en/us/td/docs/net_mgmt/netflow_collection_engine/3-6/user/guide/format.html#wp1005892
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "tcp.h"
#include "ipproto.h"
struct nfhdr_v1 {
uint16_t version; /* version number */
uint16_t count; /* # of records */
uint32_t msys_uptime;
uint32_t utc_sec;
uint32_t utc_nsec;
};
struct nfrec_v1 {
struct in_addr src_ina;
struct in_addr dst_ina;
struct in_addr nhop_ina;
uint16_t input; /* SNMP index of input interface */
uint16_t output; /* SNMP index of output interface */
uint32_t packets; /* packets in the flow */
uint32_t octets; /* layer 3 octets in the packets of the flow */
uint32_t start_time; /* sys_uptime value at start of flow */
uint32_t last_time; /* sys_uptime value when last packet of flow was received */
uint16_t srcport; /* TCP/UDP source port or equivalent */
uint16_t dstport; /* TCP/UDP source port or equivalent */
uint16_t pad1; /* pad */
uint8_t proto; /* IP protocol type */
uint8_t tos; /* IP type of service */
uint8_t tcp_flags; /* cumulative OR of TCP flags */
uint8_t pad[3]; /* padding */
uint32_t reserved; /* unused */
};
struct nfhdr_v5 {
uint16_t version; /* version number */
uint16_t count; /* # of records */
uint32_t msys_uptime;
uint32_t utc_sec;
uint32_t utc_nsec;
uint32_t sequence; /* flow sequence number */
uint8_t engine_type; /* type of flow-switching engine */
uint8_t engine_id; /* slot number of the flow-switching engine */
uint16_t sampling_interval; /* sampling mode and interval */
};
struct nfrec_v5 {
struct in_addr src_ina;
struct in_addr dst_ina;
struct in_addr nhop_ina;
uint16_t input; /* SNMP index of input interface */
uint16_t output; /* SNMP index of output interface */
uint32_t packets; /* packets in the flow */
uint32_t octets; /* layer 3 octets in the packets of the flow */
uint32_t start_time; /* sys_uptime value at start of flow */
uint32_t last_time; /* sys_uptime value when last packet of flow was received */
uint16_t srcport; /* TCP/UDP source port or equivalent */
uint16_t dstport; /* TCP/UDP source port or equivalent */
uint8_t pad1; /* pad */
uint8_t tcp_flags; /* cumulative OR of TCP flags */
uint8_t proto; /* IP protocol type */
uint8_t tos; /* IP type of service */
uint16_t src_as; /* AS number of the source */
uint16_t dst_as; /* AS number of the destination */
uint8_t src_mask; /* source address mask bits */
uint8_t dst_mask; /* destination address prefix mask bits */
uint16_t pad2;
struct in_addr peer_nexthop; /* v6: IP address of the nexthop within the peer (FIB)*/
};
struct nfhdr_v6 {
uint16_t version; /* version number */
uint16_t count; /* # of records */
uint32_t msys_uptime;
uint32_t utc_sec;
uint32_t utc_nsec;
uint32_t sequence; /* v5 flow sequence number */
uint32_t reserved; /* v5 only */
};
struct nfrec_v6 {
struct in_addr src_ina;
struct in_addr dst_ina;
struct in_addr nhop_ina;
uint16_t input; /* SNMP index of input interface */
uint16_t output; /* SNMP index of output interface */
uint32_t packets; /* packets in the flow */
uint32_t octets; /* layer 3 octets in the packets of the flow */
uint32_t start_time; /* sys_uptime value at start of flow */
uint32_t last_time; /* sys_uptime value when last packet of flow was received */
uint16_t srcport; /* TCP/UDP source port or equivalent */
uint16_t dstport; /* TCP/UDP source port or equivalent */
uint8_t pad1; /* pad */
uint8_t tcp_flags; /* cumulative OR of TCP flags */
uint8_t proto; /* IP protocol type */
uint8_t tos; /* IP type of service */
uint16_t src_as; /* AS number of the source */
uint16_t dst_as; /* AS number of the destination */
uint8_t src_mask; /* source address mask bits */
uint8_t dst_mask; /* destination address prefix mask bits */
uint16_t flags;
struct in_addr peer_nexthop; /* v6: IP address of the nexthop within the peer (FIB)*/
};
static void
cnfp_v1_print(netdissect_options *ndo, const u_char *cp)
{
register const struct nfhdr_v1 *nh;
register const struct nfrec_v1 *nr;
struct protoent *pent;
int nrecs, ver;
#if 0
time_t t;
#endif
nh = (const struct nfhdr_v1 *)cp;
ND_TCHECK(*nh);
ver = EXTRACT_16BITS(&nh->version);
nrecs = EXTRACT_32BITS(&nh->count);
#if 0
/*
* This is seconds since the UN*X epoch, and is followed by
* nanoseconds. XXX - format it, rather than just dumping the
* raw seconds-since-the-Epoch.
*/
t = EXTRACT_32BITS(&nh->utc_sec);
#endif
ND_PRINT((ndo, "NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
EXTRACT_32BITS(&nh->msys_uptime)/1000,
EXTRACT_32BITS(&nh->msys_uptime)%1000,
EXTRACT_32BITS(&nh->utc_sec), EXTRACT_32BITS(&nh->utc_nsec)));
nr = (const struct nfrec_v1 *)&nh[1];
ND_PRINT((ndo, "%2u recs", nrecs));
for (; nrecs != 0; nr++, nrecs--) {
char buf[20];
char asbuf[20];
/*
* Make sure we have the entire record.
*/
ND_TCHECK(*nr);
ND_PRINT((ndo, "\n started %u.%03u, last %u.%03u",
EXTRACT_32BITS(&nr->start_time)/1000,
EXTRACT_32BITS(&nr->start_time)%1000,
EXTRACT_32BITS(&nr->last_time)/1000,
EXTRACT_32BITS(&nr->last_time)%1000));
asbuf[0] = buf[0] = '\0';
ND_PRINT((ndo, "\n %s%s%s:%u ", intoa(nr->src_ina.s_addr), buf, asbuf,
EXTRACT_16BITS(&nr->srcport)));
ND_PRINT((ndo, "> %s%s%s:%u ", intoa(nr->dst_ina.s_addr), buf, asbuf,
EXTRACT_16BITS(&nr->dstport)));
ND_PRINT((ndo, ">> %s\n ", intoa(nr->nhop_ina.s_addr)));
pent = getprotobynumber(nr->proto);
if (!pent || ndo->ndo_nflag)
ND_PRINT((ndo, "%u ", nr->proto));
else
ND_PRINT((ndo, "%s ", pent->p_name));
/* tcp flags for tcp only */
if (pent && pent->p_proto == IPPROTO_TCP) {
int flags;
flags = nr->tcp_flags;
ND_PRINT((ndo, "%s%s%s%s%s%s%s",
flags & TH_FIN ? "F" : "",
flags & TH_SYN ? "S" : "",
flags & TH_RST ? "R" : "",
flags & TH_PUSH ? "P" : "",
flags & TH_ACK ? "A" : "",
flags & TH_URG ? "U" : "",
flags ? " " : ""));
}
buf[0]='\0';
ND_PRINT((ndo, "tos %u, %u (%u octets) %s",
nr->tos,
EXTRACT_32BITS(&nr->packets),
EXTRACT_32BITS(&nr->octets), buf));
}
return;
trunc:
ND_PRINT((ndo, "[|cnfp]"));
return;
}
static void
cnfp_v5_print(netdissect_options *ndo, const u_char *cp)
{
register const struct nfhdr_v5 *nh;
register const struct nfrec_v5 *nr;
struct protoent *pent;
int nrecs, ver;
#if 0
time_t t;
#endif
nh = (const struct nfhdr_v5 *)cp;
ND_TCHECK(*nh);
ver = EXTRACT_16BITS(&nh->version);
nrecs = EXTRACT_32BITS(&nh->count);
#if 0
/*
* This is seconds since the UN*X epoch, and is followed by
* nanoseconds. XXX - format it, rather than just dumping the
* raw seconds-since-the-Epoch.
*/
t = EXTRACT_32BITS(&nh->utc_sec);
#endif
ND_PRINT((ndo, "NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
EXTRACT_32BITS(&nh->msys_uptime)/1000,
EXTRACT_32BITS(&nh->msys_uptime)%1000,
EXTRACT_32BITS(&nh->utc_sec), EXTRACT_32BITS(&nh->utc_nsec)));
ND_PRINT((ndo, "#%u, ", EXTRACT_32BITS(&nh->sequence)));
nr = (const struct nfrec_v5 *)&nh[1];
ND_PRINT((ndo, "%2u recs", nrecs));
for (; nrecs != 0; nr++, nrecs--) {
char buf[20];
char asbuf[20];
/*
* Make sure we have the entire record.
*/
ND_TCHECK(*nr);
ND_PRINT((ndo, "\n started %u.%03u, last %u.%03u",
EXTRACT_32BITS(&nr->start_time)/1000,
EXTRACT_32BITS(&nr->start_time)%1000,
EXTRACT_32BITS(&nr->last_time)/1000,
EXTRACT_32BITS(&nr->last_time)%1000));
asbuf[0] = buf[0] = '\0';
snprintf(buf, sizeof(buf), "/%u", nr->src_mask);
snprintf(asbuf, sizeof(asbuf), ":%u",
EXTRACT_16BITS(&nr->src_as));
ND_PRINT((ndo, "\n %s%s%s:%u ", intoa(nr->src_ina.s_addr), buf, asbuf,
EXTRACT_16BITS(&nr->srcport)));
snprintf(buf, sizeof(buf), "/%d", nr->dst_mask);
snprintf(asbuf, sizeof(asbuf), ":%u",
EXTRACT_16BITS(&nr->dst_as));
ND_PRINT((ndo, "> %s%s%s:%u ", intoa(nr->dst_ina.s_addr), buf, asbuf,
EXTRACT_16BITS(&nr->dstport)));
ND_PRINT((ndo, ">> %s\n ", intoa(nr->nhop_ina.s_addr)));
pent = getprotobynumber(nr->proto);
if (!pent || ndo->ndo_nflag)
ND_PRINT((ndo, "%u ", nr->proto));
else
ND_PRINT((ndo, "%s ", pent->p_name));
/* tcp flags for tcp only */
if (pent && pent->p_proto == IPPROTO_TCP) {
int flags;
flags = nr->tcp_flags;
ND_PRINT((ndo, "%s%s%s%s%s%s%s",
flags & TH_FIN ? "F" : "",
flags & TH_SYN ? "S" : "",
flags & TH_RST ? "R" : "",
flags & TH_PUSH ? "P" : "",
flags & TH_ACK ? "A" : "",
flags & TH_URG ? "U" : "",
flags ? " " : ""));
}
buf[0]='\0';
ND_PRINT((ndo, "tos %u, %u (%u octets) %s",
nr->tos,
EXTRACT_32BITS(&nr->packets),
EXTRACT_32BITS(&nr->octets), buf));
}
return;
trunc:
ND_PRINT((ndo, "[|cnfp]"));
return;
}
static void
cnfp_v6_print(netdissect_options *ndo, const u_char *cp)
{
register const struct nfhdr_v6 *nh;
register const struct nfrec_v6 *nr;
struct protoent *pent;
int nrecs, ver;
#if 0
time_t t;
#endif
nh = (const struct nfhdr_v6 *)cp;
ND_TCHECK(*nh);
ver = EXTRACT_16BITS(&nh->version);
nrecs = EXTRACT_32BITS(&nh->count);
#if 0
/*
* This is seconds since the UN*X epoch, and is followed by
* nanoseconds. XXX - format it, rather than just dumping the
* raw seconds-since-the-Epoch.
*/
t = EXTRACT_32BITS(&nh->utc_sec);
#endif
ND_PRINT((ndo, "NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
EXTRACT_32BITS(&nh->msys_uptime)/1000,
EXTRACT_32BITS(&nh->msys_uptime)%1000,
EXTRACT_32BITS(&nh->utc_sec), EXTRACT_32BITS(&nh->utc_nsec)));
ND_PRINT((ndo, "#%u, ", EXTRACT_32BITS(&nh->sequence)));
nr = (const struct nfrec_v6 *)&nh[1];
ND_PRINT((ndo, "%2u recs", nrecs));
for (; nrecs != 0; nr++, nrecs--) {
char buf[20];
char asbuf[20];
/*
* Make sure we have the entire record.
*/
ND_TCHECK(*nr);
ND_PRINT((ndo, "\n started %u.%03u, last %u.%03u",
EXTRACT_32BITS(&nr->start_time)/1000,
EXTRACT_32BITS(&nr->start_time)%1000,
EXTRACT_32BITS(&nr->last_time)/1000,
EXTRACT_32BITS(&nr->last_time)%1000));
asbuf[0] = buf[0] = '\0';
snprintf(buf, sizeof(buf), "/%u", nr->src_mask);
snprintf(asbuf, sizeof(asbuf), ":%u",
EXTRACT_16BITS(&nr->src_as));
ND_PRINT((ndo, "\n %s%s%s:%u ", intoa(nr->src_ina.s_addr), buf, asbuf,
EXTRACT_16BITS(&nr->srcport)));
snprintf(buf, sizeof(buf), "/%d", nr->dst_mask);
snprintf(asbuf, sizeof(asbuf), ":%u",
EXTRACT_16BITS(&nr->dst_as));
ND_PRINT((ndo, "> %s%s%s:%u ", intoa(nr->dst_ina.s_addr), buf, asbuf,
EXTRACT_16BITS(&nr->dstport)));
ND_PRINT((ndo, ">> %s\n ", intoa(nr->nhop_ina.s_addr)));
pent = getprotobynumber(nr->proto);
if (!pent || ndo->ndo_nflag)
ND_PRINT((ndo, "%u ", nr->proto));
else
ND_PRINT((ndo, "%s ", pent->p_name));
/* tcp flags for tcp only */
if (pent && pent->p_proto == IPPROTO_TCP) {
int flags;
flags = nr->tcp_flags;
ND_PRINT((ndo, "%s%s%s%s%s%s%s",
flags & TH_FIN ? "F" : "",
flags & TH_SYN ? "S" : "",
flags & TH_RST ? "R" : "",
flags & TH_PUSH ? "P" : "",
flags & TH_ACK ? "A" : "",
flags & TH_URG ? "U" : "",
flags ? " " : ""));
}
buf[0]='\0';
snprintf(buf, sizeof(buf), "(%u<>%u encaps)",
(EXTRACT_16BITS(&nr->flags) >> 8) & 0xff,
(EXTRACT_16BITS(&nr->flags)) & 0xff);
ND_PRINT((ndo, "tos %u, %u (%u octets) %s",
nr->tos,
EXTRACT_32BITS(&nr->packets),
EXTRACT_32BITS(&nr->octets), buf));
}
return;
trunc:
ND_PRINT((ndo, "[|cnfp]"));
return;
}
void
cnfp_print(netdissect_options *ndo, const u_char *cp)
{
int ver;
/*
* First 2 bytes are the version number.
*/
ND_TCHECK2(*cp, 2);
ver = EXTRACT_16BITS(cp);
switch (ver) {
case 1:
cnfp_v1_print(ndo, cp);
break;
case 5:
cnfp_v5_print(ndo, cp);
break;
case 6:
cnfp_v6_print(ndo, cp);
break;
default:
ND_PRINT((ndo, "NetFlow v%x", ver));
break;
}
return;
trunc:
ND_PRINT((ndo, "[|cnfp]"));
return;
}