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netflow1.c
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netflow1.c
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/*
* Copyright 2002 Damien Miller <[email protected]> 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.
*
* 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.
*/
#include "common.h"
#include "log.h"
#include "treetype.h"
#include "softflowd.h"
#ifdef ENABLE_LEGACY
/*
* This is the Cisco Netflow(tm) version 1 packet format
* Based on:
* http://www.cisco.com/en/US/products/sw/netmgtsw/ps1964/products_implementation_design_guide09186a00800d6a11.html
*/
struct NF1_HEADER {
u_int16_t version, flows;
u_int32_t uptime_ms, time_sec, time_nanosec;
};
struct NF1_FLOW {
u_int32_t src_ip, dest_ip, nexthop_ip;
u_int16_t if_index_in, if_index_out;
u_int32_t flow_packets, flow_octets;
u_int32_t flow_start, flow_finish;
u_int16_t src_port, dest_port;
u_int16_t pad1;
u_int8_t protocol, tos, tcp_flags;
u_int8_t pad2, pad3, pad4;
u_int32_t reserved1;
#if 0
u_int8_t reserved2; /* XXX: no longer used */
#endif
};
/* Maximum of 24 flows per packet */
#define NF1_MAXFLOWS 24
#define NF1_MAXPACKET_SIZE (sizeof(struct NF1_HEADER) + \
(NF1_MAXFLOWS * sizeof(struct NF1_FLOW)))
/*
* Given an array of expired flows, send netflow v1 report packets
* Returns number of packets sent or -1 on error
*/
int
send_netflow_v1 (struct SENDPARAMETER sp) {
struct FLOW **flows = sp.flows;
int num_flows = sp.num_flows;
u_int16_t ifidx = sp.ifidx;
struct FLOWTRACKPARAMETERS *param = sp.param;
int verbose_flag = sp.verbose_flag;
struct timeval now;
u_int32_t uptime_ms;
u_int8_t packet[NF1_MAXPACKET_SIZE]; /* Maximum allowed packet size (24 flows) */
struct NF1_HEADER *hdr = NULL;
struct NF1_FLOW *flw = NULL;
int i, j, offset, num_packets;
struct timeval *system_boot_time = ¶m->system_boot_time;
u_int64_t *flows_exported = ¶m->flows_exported;
if (param->adjust_time)
now = param->last_packet_time;
else
gettimeofday (&now, NULL);
uptime_ms = timeval_sub_ms (&now, system_boot_time);
hdr = (struct NF1_HEADER *) packet;
for (num_packets = offset = j = i = 0; i < num_flows; i++) {
if (j >= NF1_MAXFLOWS - 1) {
if (verbose_flag)
logit (LOG_DEBUG, "Sending flow packet len = %d", offset);
param->records_sent += hdr->flows;
hdr->flows = htons (hdr->flows);
if (send_multi_destinations
(sp.target->num_destinations, sp.target->destinations,
sp.target->is_loadbalance, packet, offset) < 0)
return (-1);
*flows_exported += j;
j = 0;
num_packets++;
}
if (j == 0) {
memset (&packet, '\0', sizeof (packet));
hdr->version = htons (1);
hdr->flows = 0; /* Filled in as we go */
hdr->uptime_ms = htonl (uptime_ms);
hdr->time_sec = htonl (now.tv_sec);
hdr->time_nanosec = htonl (now.tv_usec * 1000);
offset = sizeof (*hdr);
}
flw = (struct NF1_FLOW *) (packet + offset);
flw->if_index_in = flw->if_index_out = htons (ifidx);
/* NetFlow v.1 doesn't do IPv6 */
if (flows[i]->af != AF_INET)
continue;
if (flows[i]->octets[0] > 0) {
flw->src_ip = flows[i]->addr[0].v4.s_addr;
flw->dest_ip = flows[i]->addr[1].v4.s_addr;
flw->src_port = flows[i]->port[0];
flw->dest_port = flows[i]->port[1];
flw->flow_packets = htonl (flows[i]->packets[0]);
flw->flow_octets = htonl (flows[i]->octets[0]);
flw->flow_start =
htonl (timeval_sub_ms (&flows[i]->flow_start, system_boot_time));
flw->flow_finish =
htonl (timeval_sub_ms (&flows[i]->flow_last, system_boot_time));
flw->protocol = flows[i]->protocol;
flw->tcp_flags = flows[i]->tcp_flags[0];
flw->tos = flows[i]->tos[0];
offset += sizeof (*flw);
j++;
hdr->flows++;
}
flw = (struct NF1_FLOW *) (packet + offset);
flw->if_index_in = flw->if_index_out = htons (ifidx);
if (flows[i]->octets[1] > 0) {
flw->src_ip = flows[i]->addr[1].v4.s_addr;
flw->dest_ip = flows[i]->addr[0].v4.s_addr;
flw->src_port = flows[i]->port[1];
flw->dest_port = flows[i]->port[0];
flw->flow_packets = htonl (flows[i]->packets[1]);
flw->flow_octets = htonl (flows[i]->octets[1]);
flw->flow_start =
htonl (timeval_sub_ms (&flows[i]->flow_start, system_boot_time));
flw->flow_finish =
htonl (timeval_sub_ms (&flows[i]->flow_last, system_boot_time));
flw->protocol = flows[i]->protocol;
flw->tcp_flags = flows[i]->tcp_flags[1];
flw->tos = flows[i]->tos[1];
offset += sizeof (*flw);
j++;
hdr->flows++;
}
}
/* Send any leftovers */
if (j != 0) {
if (verbose_flag)
logit (LOG_DEBUG, "Sending flow packet len = %d", offset);
param->records_sent += hdr->flows;
hdr->flows = htons (hdr->flows);
if (send_multi_destinations
(sp.target->num_destinations, sp.target->destinations,
sp.target->is_loadbalance, packet, offset) < 0)
return (-1);
num_packets++;
}
*flows_exported += j;
param->packets_sent += num_packets;
#ifdef ENABLE_PTHREAD
if (use_thread)
free (sp.flows);
#endif /* ENABLE_PTHREAD */
return (num_packets);
}
#endif /* ENABLE_LEGACY */