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/*
* Copyright 2019 Hitoshi Irino <irino@sfc.wide.ad.jp> 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 "ipfix.h"
#include "psamp.h"
#include <pcap.h>
#define PSAMP_SOFTFLOWD_TEMPLATE_ID 3072
#define PSAMP_SOFTFLOWD_TEMPLATE_NRECORDS 4
#define PSAMP_DATALINKFRAME_SIZE IPFIX_SOFTFLOWD_MAX_PACKET_SIZE - \
sizeof(struct IPFIX_HEADER) - sizeof(struct IPFIX_SET_HEADER) - 8 - 8 -2
const struct IPFIX_FIELD_SPECIFIER field_psamp[] = {
{PSAMP_selectionSequenceId, 8},
{PSAMP_observationTimeMicroseconds, 8},
{PSAMP_sectionExportedOctets, 2},
{PSAMP_dataLinkFrameSection, PSAMP_DATALINKFRAME_SIZE}
};
struct PSAMP_SOFTFLOWD_TEMPLATE {
struct IPFIX_TEMPLATE_SET_HEADER h;
struct IPFIX_FIELD_SPECIFIER r[PSAMP_SOFTFLOWD_TEMPLATE_NRECORDS];
} __packed;
struct PSAMP_SOFTFLOWD_TEMPLATE template;
static int psamp_pkts_until_template = -1;
static void
psamp_init_template (struct PSAMP_SOFTFLOWD_TEMPLATE *template_p) {
u_int index = 0;
memset (template_p, 0, sizeof (*template_p));
template_p->h.c.set_id = htons (IPFIX_TEMPLATE_SET_ID);
template_p->h.c.length = htons (sizeof (struct PSAMP_SOFTFLOWD_TEMPLATE));
template_p->h.r.template_id = htons (PSAMP_SOFTFLOWD_TEMPLATE_ID);
template_p->h.r.count = htons (PSAMP_SOFTFLOWD_TEMPLATE_NRECORDS);
ipfix_init_fields (template_p->r, &index, field_psamp,
PSAMP_SOFTFLOWD_TEMPLATE_NRECORDS);
}
int
send_psamp (const u_char * pkt, int caplen, struct timeval tv,
struct NETFLOW_TARGET *target, uint64_t total_packets) {
u_char packet[IPFIX_SOFTFLOWD_MAX_PACKET_SIZE];
struct IPFIX_HEADER *ipfix = (struct IPFIX_HEADER *) packet;
struct IPFIX_SET_HEADER *dh;
u_int64_t *sequenceId;
struct ntp_time_t *ntptime;
u_int16_t *exportedOctets;
int offset = sizeof (struct IPFIX_HEADER);
int copysize =
caplen < PSAMP_DATALINKFRAME_SIZE ? caplen : PSAMP_DATALINKFRAME_SIZE;
ipfix->version = htons (NF_VERSION_IPFIX); // PSAMP uses IPFIX
ipfix->export_time = htonl (tv.tv_sec);
ipfix->sequence = htonl ((u_int32_t) (total_packets & 0x00000000ffffffff));
ipfix->od_id = 0;
if (psamp_pkts_until_template == -1) {
psamp_init_template (&template);
psamp_pkts_until_template = 0;
memcpy (&packet[offset], &template, sizeof (template));
ipfix->length = htons (offset + sizeof (template));
if (send_multi_destinations
(target->num_destinations, target->destinations, 0, packet,
offset + sizeof (template)) < 0)
return (-1);
}
dh = (struct IPFIX_SET_HEADER *) &packet[offset];
dh->set_id = htons (PSAMP_SOFTFLOWD_TEMPLATE_ID);
dh->length =
htons (IPFIX_SOFTFLOWD_MAX_PACKET_SIZE - sizeof (struct IPFIX_HEADER));
offset += sizeof (struct IPFIX_SET_HEADER);
sequenceId = (u_int64_t *) & packet[offset];
*sequenceId = htobe64 (total_packets);
offset += sizeof (u_int64_t);
ntptime = (struct ntp_time_t *) &packet[offset];
conv_unix_to_ntp (tv, ntptime);
ntptime->second = htonl (ntptime->second);
ntptime->fraction = htonl (ntptime->fraction);
offset += sizeof (struct ntp_time_t);
exportedOctets = (u_int16_t *) & packet[offset];
*exportedOctets = htons (copysize);
offset += sizeof (u_int16_t);
memset (&packet[offset], 0, IPFIX_SOFTFLOWD_MAX_PACKET_SIZE - offset);
memcpy (&packet[offset], pkt, copysize);
ipfix->length = htons (IPFIX_SOFTFLOWD_MAX_PACKET_SIZE);
if (send_multi_destinations (target->num_destinations, target->destinations,
target->is_loadbalance,
packet, IPFIX_SOFTFLOWD_MAX_PACKET_SIZE) < 0)
return (-1);
return 1;
}
// This function only process softflowd orignate psamp data record.
int
recv_psamp (int rsock, struct CB_CTXT *cb_ctxt) {
char buf[IPFIX_SOFTFLOWD_MAX_PACKET_SIZE];
struct IPFIX_HEADER *ipfix = (struct IPFIX_HEADER *) buf;
struct ntp_time_t ntptime;
struct pcap_pkthdr pkthdr;
int recvsize = 0;
int offset = 0;
memset (buf, 0, sizeof (buf));
recvsize = recv (rsock, buf, sizeof (buf), 0);
if (recvsize < 0) {
perror ("recv");
return -1;
} else if (recvsize <
(sizeof (struct IPFIX_HEADER) +
sizeof (struct IPFIX_SET_HEADER) + sizeof (uint64_t) +
sizeof (struct ntp_time_t) + sizeof (uint16_t))) {
logit (LOG_DEBUG, "recv_psamp: recvsize: %d is shorter than needed size",
recvsize);
return -1;
}
offset = sizeof (struct IPFIX_HEADER);
struct IPFIX_SET_HEADER *sh = (struct IPFIX_SET_HEADER *) &buf[offset];
offset += sizeof (struct IPFIX_SET_HEADER);
if (ntohs (ipfix->version) != NF_VERSION_IPFIX)
return -1;
if (ntohs (sh->set_id) != PSAMP_SOFTFLOWD_TEMPLATE_ID)
return 0; // This function only process softflowd orignate psamp data record.
// disrgard selectionSequenceId
offset += sizeof (uint64_t);
// observationTimeMicroseconds
ntptime = *((struct ntp_time_t *) &buf[offset]);
offset += sizeof (struct ntp_time_t);
ntptime.second = ntohl (ntptime.second);
ntptime.fraction = ntohl (ntptime.fraction);
conv_ntp_to_unix (ntptime, &pkthdr.ts);
//sectionExportedOctets
pkthdr.caplen = pkthdr.len = ntohs (*((uint16_t *) & buf[offset]));
offset += sizeof (uint16_t);
pkthdr.caplen =
pkthdr.caplen <
sizeof (buf) - offset ? pkthdr.caplen : sizeof (buf) - offset;
flow_cb ((u_char *) cb_ctxt, &pkthdr, (const u_char *) &buf[offset]);
return 1;
}
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