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/*
* Copyright 2002 Damien Miller <djm@mindrot.org> 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"
/*
* This is the Cisco Netflow(tm) version 5 packet format
* Based on:
* http://www.cisco.com/en/US/products/sw/netmgtsw/ps1964/products_implementation_design_guide09186a00800d6a11.html
*/
struct NF5_HEADER {
u_int16_t version, flows;
u_int32_t uptime_ms, time_sec, time_nanosec, flow_sequence;
u_int8_t engine_type, engine_id;
u_int16_t sampling_interval;
};
struct NF5_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_int8_t pad1;
u_int8_t tcp_flags, protocol, tos;
u_int16_t src_as, dest_as;
u_int8_t src_mask, dst_mask;
u_int16_t pad2;
};
#define NF5_MAXFLOWS 30
#define NF5_MAXPACKET_SIZE (sizeof(struct NF5_HEADER) + \
(NF5_MAXFLOWS * sizeof(struct NF5_FLOW)))
/*
* Given an array of expired flows, send netflow v5 report packets
* Returns number of packets sent or -1 on error
*/
int
send_netflow_v5(struct FLOW **flows, int num_flows, int nfsock, u_int16_t ifidx,
u_int64_t *flows_exported, struct timeval *system_boot_time,
int verbose_flag, struct OPTION *option)
{
struct timeval now;
u_int32_t uptime_ms;
u_int8_t packet[NF5_MAXPACKET_SIZE]; /* Maximum allowed packet size (24 flows) */
struct NF5_HEADER *hdr = NULL;
struct NF5_FLOW *flw = NULL;
int i, j, offset, num_packets, err;
socklen_t errsz;
gettimeofday(&now, NULL);
uptime_ms = timeval_sub_ms(&now, system_boot_time);
hdr = (struct NF5_HEADER *)packet;
for (num_packets = offset = j = i = 0; i < num_flows; i++) {
if (j >= NF5_MAXFLOWS - 1) {
if (verbose_flag)
logit(LOG_DEBUG, "Sending flow packet len = %d", offset);
hdr->flows = htons(hdr->flows);
errsz = sizeof(err);
getsockopt(nfsock, SOL_SOCKET, SO_ERROR,
&err, &errsz); /* Clear ICMP errors */
if (send(nfsock, packet, (size_t)offset, 0) == -1)
return (-1);
*flows_exported += j;
j = 0;
num_packets++;
}
if (j == 0) {
memset(&packet, '\0', sizeof(packet));
hdr->version = htons(5);
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);
hdr->flow_sequence = htonl(*flows_exported);
if (option->sample > 0) {
hdr->sampling_interval =
htons(0x01 << 14 | option->sample & 0x3FFF);
}
/* Other fields are left zero */
offset = sizeof(*hdr);
}
flw = (struct NF5_FLOW *)(packet + offset);
flw->if_index_in = flw->if_index_out = htons(ifidx);
/* NetFlow v.5 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->tcp_flags = flows[i]->tcp_flags[0];
flw->protocol = flows[i]->protocol;
offset += sizeof(*flw);
j++;
hdr->flows++;
}
flw = (struct NF5_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->tcp_flags = flows[i]->tcp_flags[1];
flw->protocol = flows[i]->protocol;
offset += sizeof(*flw);
j++;
hdr->flows++;
}
}
/* Send any leftovers */
if (j != 0) {
if (verbose_flag)
logit(LOG_DEBUG, "Sending v5 flow packet len = %d",
offset);
hdr->flows = htons(hdr->flows);
errsz = sizeof(err);
getsockopt(nfsock, SOL_SOCKET, SO_ERROR,
&err, &errsz); /* Clear ICMP errors */
if (send(nfsock, packet, (size_t)offset, 0) == -1)
return (-1);
num_packets++;
}
*flows_exported += j;
return (num_packets);
}
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