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engine.c
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/*
* nProbe - a Netflow v5/v9/IPFIX probe for IPv4/v6
*
* Copyright (C) 2002-14 Luca Deri <deri@ntop.org>
*
* http://www.ntop.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "nprobe.h"
// #define ACCURATE_HASH 1
/* ****************************************************** */
void freenDPI(FlowHashBucket *myBucket) {
if(myBucket->core.l7.proto.ndpi.flow) {
free(myBucket->core.l7.proto.ndpi.flow);
myBucket->core.l7.proto.ndpi.flow = NULL;
}
if(myBucket->core.l7.proto.ndpi.src) {
free(myBucket->core.l7.proto.ndpi.src);
myBucket->core.l7.proto.ndpi.src = NULL;
}
if(myBucket->core.l7.proto.ndpi.dst) {
free(myBucket->core.l7.proto.ndpi.dst);
myBucket->core.l7.proto.ndpi.dst = NULL;
}
}
/* ****************************************************** */
void allocateFlowHash(int thread_id) {
u_int mallocSize = sizeof(FlowHashBucket*)*readOnlyGlobals.flowHashSize;
readWriteGlobals->theFlowHash[thread_id] = (FlowHashBucket**)calloc(1, mallocSize);
if(readWriteGlobals->theFlowHash[thread_id] == NULL) {
traceEvent(TRACE_ERROR, "Not enough memory");
exit(-1);
}
readWriteGlobals->expireFlowListHead[thread_id] = NULL, readWriteGlobals->expireFlowListTail[thread_id] = NULL;
readWriteGlobals->idleFlowListHead[thread_id] = NULL, readWriteGlobals->idleFlowListTail[thread_id] = NULL;
}
/* ****************************** */
/*
* A faster replacement for inet_ntoa().
*/
char* _intoaV4(unsigned int addr, char* buf, u_short bufLen) {
char *cp, *retStr;
int n;
cp = &buf[bufLen];
*--cp = '\0';
n = 4;
do {
u_int byte;
byte = addr & 0xff;
*--cp = byte % 10 + '0';
byte /= 10;
if(byte > 0) {
*--cp = byte % 10 + '0';
byte /= 10;
if(byte > 0)
*--cp = byte + '0';
}
*--cp = '.';
addr >>= 8;
} while (--n > 0);
/* Convert the string to lowercase */
retStr = (char*)(cp+1);
return(retStr);
}
/* ****************************** */
char* _intoa(IpAddress addr, char* buf, u_short bufLen) {
if((addr.ipVersion == 4) || (addr.ipVersion == 0 /* Misconfigured */))
return(_intoaV4(addr.ipType.ipv4, buf, bufLen));
else {
char *ret;
#if 0
ret = (char*)inet_ntop(AF_INET6, &addr.ipType.ipv6, &buf[1], bufLen-2);
#else
ret = (char*)inet_ntop(AF_INET6, &addr.ipType.ipv6, buf, bufLen);
#endif
if(ret == NULL) {
traceEvent(TRACE_WARNING, "Internal error (buffer too short)");
buf[0] = '\0';
}
#if 0
else {
int len = strlen(ret);
buf[0] = '[';
buf[len+1] = ']';
buf[len+2] = '\0';
}
#endif
return(buf);
}
}
/* ****************************************************** */
char* formatTraffic(float numBits, int bits, char *buf) {
char unit;
if(bits)
unit = 'b';
else
unit = 'B';
if(numBits < 1024) {
snprintf(buf, 32, "%lu %c", (unsigned long)numBits, unit);
} else if(numBits < 1048576) {
snprintf(buf, 32, "%.2f K%c", (float)(numBits)/1024, unit);
} else {
float tmpMBits = ((float)numBits)/1048576;
if(tmpMBits < 1024) {
snprintf(buf, 32, "%.2f M%c", tmpMBits, unit);
} else {
tmpMBits /= 1024;
if(tmpMBits < 1024) {
snprintf(buf, 32, "%.2f G%c", tmpMBits, unit);
} else {
snprintf(buf, 32, "%.2f T%c", (float)(tmpMBits)/1024, unit);
}
}
}
return(buf);
}
/* ****************************************************** */
char* formatPackets(float numPkts, char *buf) {
if(numPkts < 1000) {
snprintf(buf, 32, "%.2f", numPkts);
} else if(numPkts < 1000000) {
snprintf(buf, 32, "%.2f K", numPkts/1000);
} else {
numPkts /= 1000000;
snprintf(buf, 32, "%.2f M", numPkts);
}
return(buf);
}
/* ******************************************************** */
/*
We need to create a key that is more reliable than the hash value
that can easily lead to false positives
*/
u_int64_t getLRUCacheKey(FlowHashBucket *bkt) {
u_int64_t key =
(bkt->core.tuple.flow_hash /* << 32 */)
+ (bkt->core.tuple.key.k.ipKey.proto << 24)
+ (bkt->core.tuple.key.vlanId << 16)
+ (bkt->core.tuple.key.k.ipKey.sport * bkt->core.tuple.key.k.ipKey.dport);
return(key);
}
/* ******************************************************** */
void setnDPIProto(FlowHashBucket *bkt, u_int16_t proto_id) {
if(proto_id != NDPI_PROTOCOL_UNKNOWN) {
bkt->core.l7.proto.ndpi.ndpi_proto = proto_id,
bkt->core.l7.proto_type = NDPI_PROTO_TYPE,
bkt->core.l7.proto.ndpi.detection_completed = 1;
if(!readOnlyGlobals.enableL7BridgePlugin)
freenDPI(bkt);
}
}
/* ******************************************************** */
#define MAX_PKTS 7
void setPayload(FlowHashBucket *bkt,
const struct pcap_pkthdr *h, u_char *p,
u_int16_t ip_offset, u_char *payload,
int payloadLen, FlowDirection direction) {
if(bkt->core.l7.proto.ndpi.detection_completed
|| (!readOnlyGlobals.enable_l7_protocol_discovery)
|| (bkt->core.l7.proto_type != NO_PROTO_TYPE)
|| (bkt->core.l7.proto.ndpi.ndpi_proto != NDPI_PROTOCOL_UNKNOWN))
return;
/* Initial bytes only please */
if((bkt->core.tuple.flowCounters.pktSent < MAX_PKTS)
&& (bkt->core.tuple.flowCounters.pktRcvd < MAX_PKTS)) {
u_int16_t ndpi_proto;
if(!bkt->core.l7.proto.ndpi.searched_port_based_protocol) {
ndpi_proto = ndpi_find_port_based_protocol(readOnlyGlobals.l7.l7handler,
bkt->core.tuple.key.k.ipKey.proto,
bkt->core.tuple.key.k.ipKey.src.ipType.ipv4,
bkt->core.tuple.key.k.ipKey.sport,
bkt->core.tuple.key.k.ipKey.dst.ipType.ipv4,
bkt->core.tuple.key.k.ipKey.dport);
setnDPIProto(bkt, ndpi_proto);
bkt->core.l7.proto.ndpi.searched_port_based_protocol = 1;
}
if((bkt->core.l7.proto.ndpi.ndpi_proto == NDPI_PROTOCOL_UNKNOWN)
&& bkt->core.l7.proto.ndpi.flow) {
u_int64_t when = ((u_int64_t) h->ts.tv_sec) * 1000 /* detection_tick_resolution */
+ h->ts.tv_usec / 1000 /* (1000000 / detection_tick_resolution) */;
/* traceEvent(TRACE_NORMAL, "[caplen=%u/len=%u][ip_offset=%u][payloadLen=%u][diff=%d]",
h->caplen, h->len, ip_offset, payloadLen, h->caplen-ip_offset);
*/
ndpi_proto = ndpi_detection_process_packet(readOnlyGlobals.l7.l7handler,
bkt->core.l7.proto.ndpi.flow,
(u_int8_t *)&p[ip_offset],
h->caplen-ip_offset, when,
bkt->core.l7.proto.ndpi.src,
bkt->core.l7.proto.ndpi.dst);
setnDPIProto(bkt, ndpi_proto);
}
} else {
bkt->core.l7.proto.ndpi.detection_completed = 1, bkt->core.l7.proto_type = NDPI_PROTO_TYPE;
freenDPI(bkt);
}
}
/* ************************************************* */
static void updateApplLatency(u_short proto, FlowHashBucket *bkt,
FlowDirection direction, struct timeval *stamp) {
if((!readOnlyGlobals.enableLatencyStats)
|| (bkt->ext == NULL)
|| (bkt->ext->extensions == NULL)
)
return;
if(!applLatencyComputed(bkt->ext)) {
/*
src ---------> dst -+
| Application
| Latency
<-------- -+
NOTE:
1. Application latency is calculated as the time passed since the first
packet sent the first packet on the opposite direction is received.
2. Application latency is calculated only on the first packet
*/
if(direction == src2dst_direction) {
/* src->dst */
if(bkt->ext->extensions->src2dstApplLatency.tv_sec == 0)
bkt->ext->extensions->src2dstApplLatency.tv_sec = stamp->tv_sec, bkt->ext->extensions->src2dstApplLatency.tv_usec = stamp->tv_usec;
if(bkt->ext->extensions->dst2srcApplLatency.tv_sec != 0) {
bkt->ext->extensions->dst2srcApplLatency.tv_sec = bkt->ext->extensions->src2dstApplLatency.tv_sec-bkt->ext->extensions->dst2srcApplLatency.tv_sec;
if((bkt->ext->extensions->src2dstApplLatency.tv_usec-bkt->ext->extensions->dst2srcApplLatency.tv_usec) < 0) {
bkt->ext->extensions->dst2srcApplLatency.tv_usec = 1000000 + bkt->ext->extensions->src2dstApplLatency.tv_usec - bkt->ext->extensions->dst2srcApplLatency.tv_usec;
if(bkt->ext->extensions->dst2srcApplLatency.tv_usec > 1000000) bkt->ext->extensions->dst2srcApplLatency.tv_usec = 1000000;
bkt->ext->extensions->dst2srcApplLatency.tv_sec--;
} else
bkt->ext->extensions->dst2srcApplLatency.tv_usec = bkt->ext->extensions->src2dstApplLatency.tv_usec-bkt->ext->extensions->dst2srcApplLatency.tv_usec;
bkt->ext->extensions->src2dstApplLatency.tv_sec = 0, bkt->ext->extensions->src2dstApplLatency.tv_usec = 0;
NPROBE_FD_SET(FLAG_APPL_LATENCY_COMPUTED, &(bkt->ext->flags));
}
} else {
/* dst -> src */
if(bkt->ext->extensions->dst2srcApplLatency.tv_sec == 0)
bkt->ext->extensions->dst2srcApplLatency.tv_sec = stamp->tv_sec, bkt->ext->extensions->dst2srcApplLatency.tv_usec = stamp->tv_usec;
if(bkt->ext->extensions->src2dstApplLatency.tv_sec != 0) {
bkt->ext->extensions->src2dstApplLatency.tv_sec = bkt->ext->extensions->dst2srcApplLatency.tv_sec-bkt->ext->extensions->src2dstApplLatency.tv_sec;
if((bkt->ext->extensions->dst2srcApplLatency.tv_usec-bkt->ext->extensions->src2dstApplLatency.tv_usec) < 0) {
bkt->ext->extensions->src2dstApplLatency.tv_usec = 1000000 + bkt->ext->extensions->dst2srcApplLatency.tv_usec - bkt->ext->extensions->src2dstApplLatency.tv_usec;
if(bkt->ext->extensions->src2dstApplLatency.tv_usec > 1000000) bkt->ext->extensions->src2dstApplLatency.tv_usec = 1000000;
bkt->ext->extensions->src2dstApplLatency.tv_sec--;
} else
bkt->ext->extensions->src2dstApplLatency.tv_usec = bkt->ext->extensions->dst2srcApplLatency.tv_usec-bkt->ext->extensions->src2dstApplLatency.tv_usec;
bkt->ext->extensions->dst2srcApplLatency.tv_sec = 0, bkt->ext->extensions->dst2srcApplLatency.tv_usec = 0;
NPROBE_FD_SET(FLAG_APPL_LATENCY_COMPUTED, &(bkt->ext->flags));
}
}
#if 0
if(applLatencyComputed(bkt)) {
char buf[64], buf1[64];
if(bkt->ext->extensions->src2dstApplLatency.tv_sec || bkt->ext->extensions->src2dstApplLatency.tv_usec)
printf("[Appl: %.2f ms (%s->%s)]", (float)(bkt->ext->extensions->src2dstApplLatency.tv_sec*1000
+(float)bkt->ext->extensions->src2dstApplLatency.tv_usec/1000),
_intoa(bkt->src, buf, sizeof(buf)), _intoa(bkt->dst, buf1, sizeof(buf1)));
else
printf("[Appl: %.2f ms (%s->%s)]", (float)(bkt->ext->extensions->dst2srcApplLatency.tv_sec*1000
+(float)bkt->ext->extensions->dst2srcApplLatency.tv_usec/1000),
_intoa(bkt->dst, buf, sizeof(buf)), _intoa(bkt->src, buf1, sizeof(buf1)));
}
#endif
}
}
/* ****************************************************** */
static void updatePktLenStats(FlowHashBucket *bkt, FlowDirection direction,
struct timeval *when,
u_int pkt_len, u_int8_t ttl_val, u_int numPkts) {
if(pkt_len > bkt->ext->flowCounters.pktSize.longest)
bkt->ext->flowCounters.pktSize.longest = pkt_len;
if((bkt->ext->flowCounters.pktSize.shortest == 0)
|| (pkt_len < bkt->ext->flowCounters.pktSize.shortest))
bkt->ext->flowCounters.pktSize.shortest = pkt_len;
if(bkt->ext->extensions && readOnlyGlobals.enablePacketStats) {
EtherStats *eth = (direction == src2dst_direction) ? &bkt->ext->extensions->etherstats.src2dst : &bkt->ext->extensions->etherstats.dst2src;
TTLStats *ttl = (direction == src2dst_direction) ? &bkt->ext->extensions->ttlstats.src2dst : &bkt->ext->extensions->ttlstats.dst2src;
struct timeval delta;
/*
The value of numPkts must be 1, but in case of fragmented packets it can be more than one. In this
case stats are not too precise as more packets are collapsed into one however we believe it is
precise enough for our calculations belo
*/
if(pkt_len <= 128) eth->num_pkts_up_to_128_bytes += numPkts;
else if(pkt_len <= 256) eth->num_pkts_128_to_256_bytes += numPkts;
else if(pkt_len <= 512) eth->num_pkts_256_to_512_bytes += numPkts;
else if(pkt_len <= 1024) eth->num_pkts_512_to_1024_bytes += numPkts;
else if(pkt_len <= 1514) eth->num_pkts_1024_to_1514_bytes += numPkts;
else eth->num_pkts_over_1514_bytes += numPkts;
if(ttl_val == 1) ttl->num_pkts_eq_1 += numPkts;
else if(ttl_val <= 5) ttl->num_pkts_2_5 += numPkts;
else if(ttl_val <= 32) ttl->num_pkts_5_32 += numPkts;
else if(ttl_val <= 64) ttl->num_pkts_32_64 += numPkts;
else if(ttl_val <= 96) ttl->num_pkts_64_96 += numPkts;
else if(ttl_val <= 128) ttl->num_pkts_96_128 += numPkts;
else if(ttl_val <= 160) ttl->num_pkts_128_160 += numPkts;
else if(ttl_val <= 192) ttl->num_pkts_160_192 += numPkts;
else if(ttl_val <= 224) ttl->num_pkts_192_224 += numPkts;
else ttl->num_pkts_224_255 += numPkts;
if(direction == src2dst_direction) {
if(bkt->core.tuple.flowTimers.lastSeenSent.tv_sec == 0) {
// diff = 0;
} else {
timeval_diff(&bkt->core.tuple.flowTimers.lastSeenSent, when, &delta, 0);
// diff = toMs(&delta);
}
} else {
if(bkt->core.tuple.flowTimers.lastSeenRcvd.tv_sec == 0) {
// diff = 0;
} else {
timeval_diff(&bkt->core.tuple.flowTimers.lastSeenRcvd, when, &delta, 0);
// diff = toMs(&delta);
}
}
}
}
/* ****************************************************** */
static void updateTTL(FlowHashBucket *bkt, FlowDirection direction, u_int8_t ttl) {
if(direction == src2dst_direction) {
if(ttl > 0) {
if(bkt->ext->src2dstMinTTL == 0)
bkt->ext->src2dstMinTTL = ttl;
else
bkt->ext->src2dstMinTTL = min(bkt->ext->src2dstMinTTL, ttl);
}
bkt->ext->src2dstMaxTTL = max(bkt->ext->src2dstMaxTTL, ttl);
} else {
if(ttl > 0) {
if(bkt->ext->dst2srcMinTTL == 0)
bkt->ext->dst2srcMinTTL = ttl;
else
bkt->ext->dst2srcMinTTL = min(bkt->ext->dst2srcMinTTL, ttl);
}
bkt->ext->dst2srcMaxTTL = max(bkt->ext->dst2srcMaxTTL, ttl);
}
}
/* ****************************************************** */
static void updateTos(FlowHashBucket *bkt, FlowDirection direction, u_int8_t tos) {
if(direction == src2dst_direction)
bkt->ext->src2dstTos |= tos;
else
bkt->ext->dst2srcTos |= tos;
}
/* ****************************************************** */
void timeval_diff(struct timeval *begin, struct timeval *end,
struct timeval *result, u_short divide_by_two) {
if(end->tv_sec >= begin->tv_sec) {
result->tv_sec = end->tv_sec-begin->tv_sec;
if((end->tv_usec - begin->tv_usec) < 0) {
result->tv_usec = 1000000 + end->tv_usec - begin->tv_usec;
if(result->tv_usec > 1000000) begin->tv_usec = 1000000;
result->tv_sec--;
} else
result->tv_usec = end->tv_usec-begin->tv_usec;
if(divide_by_two)
result->tv_sec /= 2, result->tv_usec /= 2;
} else
result->tv_sec = 0, result->tv_usec = 0;
}
/* ****************************************************** */
static char* print_flags(u_int8_t flags, char *buf, u_int buf_len) {
snprintf(buf, buf_len, "%s%s%s%s%s",
(flags & TH_SYN) ? " SYN" : "",
(flags & TH_ACK) ? " ACK" : "",
(flags & TH_FIN) ? " FIN" : "",
(flags & TH_RST) ? " RST" : "",
(flags & TH_PUSH) ? " PUSH" : "");
if(buf[0] == ' ')
return(&buf[1]);
else
return(buf);
}
/* ****************************************************** */
static u_int32_t getNextTcpSeq(u_int8_t tcpFlags,
u_int32_t tcpSeqNum,
u_int32_t payloadLen) {
return(tcpSeqNum + ((tcpFlags & TH_SYN) ? 1 : 0) + payloadLen);
}
/* ****************************************************** */
static u_int8_t updateTcpSeq(struct timeval *when,
FlowHashBucket *bkt, FlowDirection direction,
u_int8_t tcpFlags, u_int32_t tcpSeqNum,
u_int32_t tcpAckNum, u_int32_t payloadLen,
u_int16_t tcpWin,
const struct pcap_pkthdr *h, u_char *p, u_int32_t len) {
u_int32_t nextSeqNum;
u_int8_t retransmitted_pkt = 0;
u_int8_t update_last_seqnum = 1;
if(!readOnlyGlobals.enableTcpSeqStats) return(0);
if(bkt->ext->extensions == NULL) return(0);
// if(unlikely(readOnlyGlobals.enable_debug)) traceEvent(TRACE_ERROR, "updateTcpSeq(seqNum=%u, ackNum=%u)", tcpSeqNum, tcpAckNum);
/* Not always nProbe gets the TCP sequence number */
if(tcpSeqNum == 0) return(0);
nextSeqNum = getNextTcpSeq(tcpFlags, tcpSeqNum, payloadLen);
if(bkt->ext->lastPktDirection != direction) {
double msLatency, lastLatency;
/*
In case we're in the middle of a connection, the network delay
is the miminum (yet > 0) that we have observed so far. This is
because some communications might be triggered based on some events
and thus we need to take as latency the minimum of observed event
latency
*/
if(direction == src2dst_direction) {
if((bkt->ext->extensions->tcpseq.src2dst.next == tcpSeqNum)
&& (bkt->ext->extensions->tcpseq.dst2src.next == tcpAckNum)
&& (bkt->ext->extensions->synTime.tv_sec == 0)
&& ((bkt->ext->extensions->clientNwLatency.tv_sec == 0) && (bkt->ext->extensions->clientNwLatency.tv_usec == 0))) {
/* This is what we waited for */
msLatency = toMs(when) - toMs(&bkt->core.tuple.flowTimers.lastSeenRcvd);
lastLatency = toMs(&bkt->ext->extensions->clientNwLatency);
if((msLatency < lastLatency) || (lastLatency == 0)) {
timeval_diff(&bkt->core.tuple.flowTimers.lastSeenRcvd, when, &bkt->ext->extensions->clientNwLatency, 1);
if(0)
traceEvent(TRACE_NORMAL, "Recomputed client latency [Client: %.2f ms]",
(float)(bkt->ext->extensions->clientNwLatency.tv_sec*1000+(float)bkt->ext->extensions->clientNwLatency.tv_usec/1000));
}
}
} else {
if((bkt->ext->extensions->tcpseq.dst2src.next == tcpSeqNum)
&& (bkt->ext->extensions->tcpseq.src2dst.next == tcpAckNum)
&& ((bkt->ext->extensions->serverNwLatency.tv_sec == 0) && (bkt->ext->extensions->serverNwLatency.tv_usec == 0))) {
/* This is what we waited for */
msLatency = toMs(when) - toMs(&bkt->core.tuple.flowTimers.lastSeenSent);
lastLatency = toMs(&bkt->ext->extensions->serverNwLatency);
if((msLatency < lastLatency) || (lastLatency == 0)) {
timeval_diff(&bkt->core.tuple.flowTimers.lastSeenSent, when, &bkt->ext->extensions->serverNwLatency, 1);
if(0)
traceEvent(TRACE_NORMAL, "Recomputed server latency [Server: %.2f ms]",
(float)(bkt->ext->extensions->serverNwLatency.tv_sec*1000+(float)bkt->ext->extensions->serverNwLatency.tv_usec/1000));
}
}
}
}
#if 0
if(unlikely(readOnlyGlobals.enable_debug))
traceEvent(TRACE_ERROR, "[%s] [payload_len=%u][%s][received=%u][expected=%u][next=%u][ack=%u][ooo=%u][retransmitted=%u][latency=%.2f ms]",
(direction == src2dst_direction) ? "src->dst" : "dst->src",
payloadLen, print_flags(tcpFlags, buf, sizeof(buf)), tcpSeqNum,
(direction == src2dst_direction) ? bkt->ext->extensions->tcpseq.src2dst.next : bkt->ext->extensions->tcpseq.dst2src.next,
nextSeqNum, tcpAckNum,
(direction == src2dst_direction) ? bkt->ext->protoCounters.tcp.sentOOOrder :
bkt->ext->protoCounters.tcp.rcvdOOOrder,
(direction == src2dst_direction) ? bkt->ext->protoCounters.tcp.pktSentRetransmitted :
bkt->ext->protoCounters.tcp.pktRcvdRetransmitted,
(direction == src2dst_direction) ? toMs(&bkt->ext->extensions->clientNwLatency) : toMs(&bkt->ext->extensions->serverNwLatency));
#endif
if(direction == src2dst_direction) {
/* src -> dst */
if(bkt->ext->extensions->tcpseq.src2dst.next > 0) {
if(bkt->ext->extensions->tcpseq.src2dst.next != tcpSeqNum) {
if(bkt->ext->extensions->tcpseq.src2dst.last == tcpSeqNum) {
bkt->ext->protoCounters.tcp.pktSentRetransmitted++, retransmitted_pkt = 1;
bkt->ext->protoCounters.tcp.bytesSentRetransmitted += len;
if(unlikely(readOnlyGlobals.enable_debug))
traceEvent(TRACE_WARNING, "Found retransmitted packet src->dst [seq: %u][last: %u][next: %u][win: %u]",
tcpSeqNum, bkt->ext->extensions->tcpseq.src2dst.last,
bkt->ext->extensions->tcpseq.src2dst.next, tcpWin);
} else if(bkt->ext->extensions->tcpseq.src2dst.last > (tcpSeqNum-1)) {
bkt->ext->protoCounters.tcp.sentOOOrder++;
update_last_seqnum = 0;
if(unlikely(readOnlyGlobals.enable_debug)) {
traceEvent(TRACE_WARNING, "Found OoOrder packet src->dst [seq: %u][expected: %u]",
tcpSeqNum, bkt->ext->extensions->tcpseq.src2dst.next);
dump_bad_packet(h, p);
}
}
}
}
bkt->ext->extensions->tcpseq.src2dst.next = nextSeqNum;
if(update_last_seqnum) bkt->ext->extensions->tcpseq.src2dst.last = tcpSeqNum;
} else {
/* dst -> src */
if(bkt->ext->extensions->tcpseq.dst2src.next > 0) {
if(bkt->ext->extensions->tcpseq.dst2src.next != tcpSeqNum) {
if(bkt->ext->extensions->tcpseq.dst2src.last == tcpSeqNum) {
bkt->ext->protoCounters.tcp.pktRcvdRetransmitted++, retransmitted_pkt = 1;
bkt->ext->protoCounters.tcp.bytesRcvdRetransmitted += len;
// 01/Sep/2012 21:30:05 [engine.c:496] WARNING: Found retransmitted packet dst->src [seq: 1114407503][last: 1114410423][next: 1114413343][win: 63352]
if(unlikely(readOnlyGlobals.enable_debug))
traceEvent(TRACE_WARNING, "Found retransmitted packet dst->src [seq: %u][last: %u][next: %u][win: %u]",
tcpSeqNum, bkt->ext->extensions->tcpseq.dst2src.last,
bkt->ext->extensions->tcpseq.dst2src.next, tcpWin);
} else if(bkt->ext->extensions->tcpseq.dst2src.last > (tcpSeqNum-1)) {
bkt->ext->protoCounters.tcp.rcvdOOOrder++;
update_last_seqnum = 0;
if(unlikely(readOnlyGlobals.enable_debug)) {
traceEvent(TRACE_WARNING, "Found OoOrder packet dst->src [seq: %u][expected: %u]",
tcpSeqNum, bkt->ext->extensions->tcpseq.dst2src.next);
dump_bad_packet(h, p);
}
}
}
}
bkt->ext->extensions->tcpseq.dst2src.next = nextSeqNum;
if(update_last_seqnum) bkt->ext->extensions->tcpseq.dst2src.last = tcpSeqNum;
}
return(retransmitted_pkt);
}
/* ****************************************************** */
/*
Client nProbe Server
-> SYN synTime
<- SYN|ACK synAckTime
-> ACK ackTime
serverNwLatency = (synAckTime - synTime) / 2
clientNwLatency = (ackTime - synAckTime) / 2
*/
static void updateTcpFlags(FlowHashBucket *bkt, FlowDirection direction,
struct timeval *stamp, u_int8_t flags,
u_int16_t tcpMaxSegmentSize, u_int8_t tcpWinScale) {
#if 0
char buf[32];
traceEvent(TRACE_NORMAL, "updateTcpFlags() [%s][direction: %s]",
print_flags(flags, buf, sizeof(buf)),
direction == src2dst_direction ? "src->dst" : "dst->src");
#endif
if(unlikely(bkt->ext->beginInitiator == unknown_direction)) {
if(flags == TH_SYN)
bkt->ext->beginInitiator = direction;
else if(flags == (TH_SYN|TH_ACK))
bkt->ext->beginInitiator = (direction == src2dst_direction) ? dst2src_direction : src2dst_direction;
}
/* This is a termination */
if(((flags & TH_FIN) == TH_FIN) || ((flags & TH_RST) == TH_RST)) {
/* Check if this is the first FIN/RST */
if(((bkt->ext->protoCounters.tcp.src2dstTcpFlags & (TH_FIN|TH_RST)) == 0)
&& ((bkt->ext->protoCounters.tcp.dst2srcTcpFlags & (TH_FIN|TH_RST)) == 0))
bkt->ext->terminationInitiator = direction;
}
if(bkt->ext->extensions == NULL) return;
if(flags == TH_SYN) {
bkt->ext->protoCounters.tcp.tcpMaxSegmentSize = tcpMaxSegmentSize,
bkt->ext->protoCounters.tcp.tcpWinScale = tcpWinScale;
}
if(!nwLatencyComputed(bkt->ext)) {
if((flags == TH_SYN) && (bkt->ext->extensions->synTime.tv_sec == 0 /* No retransmission */)) {
bkt->ext->extensions->synTime.tv_sec = stamp->tv_sec,
bkt->ext->extensions->synTime.tv_usec = stamp->tv_usec;
} else if((flags == (TH_SYN | TH_ACK)) && (bkt->ext->extensions->synAckTime.tv_sec == 0 /* No retransmission */)) {
if(bkt->ext->extensions->synTime.tv_sec != 0) {
bkt->ext->extensions->synAckTime.tv_sec = stamp->tv_sec,
bkt->ext->extensions->synAckTime.tv_usec = stamp->tv_usec;
timeval_diff(&bkt->ext->extensions->synTime, stamp, &bkt->ext->extensions->serverNwLatency, 1);
}
} else if(flags == TH_ACK) {
if(bkt->ext->extensions->synTime.tv_sec == 0) {
/* We missed the SYN flag */
NPROBE_FD_SET(FLAG_NW_LATENCY_COMPUTED, &(bkt->ext->flags));
NPROBE_FD_SET(FLAG_APPL_LATENCY_COMPUTED, &(bkt->ext->flags)); /* We cannot calculate it as we have
missed the 3-way handshake */
return;
}
if(((direction == src2dst_direction) && (bkt->ext->protoCounters.tcp.src2dstTcpFlags != TH_SYN))
|| ((direction == dst2src_direction) && (bkt->ext->protoCounters.tcp.dst2srcTcpFlags != TH_SYN)))
return; /* Wrong flags */
if(bkt->ext->extensions->synAckTime.tv_sec > 0) {
timeval_diff(&bkt->ext->extensions->synAckTime, stamp, &bkt->ext->extensions->clientNwLatency, 1);
NPROBE_FD_SET(FLAG_NW_LATENCY_COMPUTED, &(bkt->ext->flags));
updateApplLatency(IPPROTO_TCP, bkt, direction, stamp);
#if 0
if(unlikely(readOnlyGlobals.enable_debug))
traceEvent(TRACE_NORMAL, "[Client: %.2f ms][Server: %.2f ms]\n",
(float)(bkt->ext->extensions->clientNwLatency.tv_sec*1000+(float)bkt->ext->extensions->clientNwLatency.tv_usec/1000),
(float)(bkt->ext->extensions->serverNwLatency.tv_sec*1000+(float)bkt->ext->extensions->serverNwLatency.tv_usec/1000));
#endif
}
}
} else {
/* Nw latency computed */
if(!applLatencyComputed(bkt->ext)) {
/*
src ---------> dst -+
| Application
| Latency
<-------- -+
NOTE:
1. Application latency is calculated as the time passed since the first
packet sent after the 3-way handshake until the first packet on
the opposite direction is received.
2. Application latency is calculated only on the first packet
*/
updateApplLatency(IPPROTO_TCP, bkt, direction, stamp);
}
}
}
/* ****************************************************** */
/*
1 - equal
0 - different
*/
int cmpIpAddress(IpAddress *src, IpAddress *dst) {
if(src->ipVersion != dst->ipVersion) return(0);
if(src->ipVersion == 4) {
return(src->ipType.ipv4 == dst->ipType.ipv4 ? 1 : 0);
} else {
return(!memcmp(&src->ipType.ipv6, &dst->ipType.ipv6, sizeof(struct in6_addr)));
}
}
/* ****************************************************** */
u_int32_t get_flow_serial() {
if(unlikely(readOnlyGlobals.useLocks)) {
u_int32_t serial;
#ifdef HAVE_BUILTIN_ATOMIC
serial = __sync_add_and_fetch(&readWriteGlobals->flow_serial, 1);
#else
pthread_rwlock_wrlock(&readOnlyGlobals.ticksLock);
serial = readWriteGlobals->flow_serial;
readWriteGlobals->flow_serial++;
pthread_rwlock_unlock(&readOnlyGlobals.ticksLock);
#endif
return(serial);
} else
return(readWriteGlobals->flow_serial++);
}
/* ****************************************************** */
static FlowHashBucket* allocFlowBucket(u_int8_t proto, u_short thread_id,
u_short mutex_idx, u_short idx) {
FlowHashBucket *bkt;
ticks when;
static u_int8_t once = 0;
if(unlikely(readOnlyGlobals.tracePerformance)) when = getticks();
bkt = (FlowHashBucket*)calloc(1, sizeof(FlowHashBucket));
if(bkt == NULL)
goto bkt_failure;
if(unlikely(readOnlyGlobals.tracePerformance)) {
ticks diff = getticks() - when;
if(unlikely(readOnlyGlobals.useLocks)) pthread_rwlock_wrlock(&readOnlyGlobals.ticksLock);
readOnlyGlobals.bucketMallocTicks += diff, readOnlyGlobals.num_malloced_buckets++;
if(unlikely(readOnlyGlobals.useLocks)) pthread_rwlock_unlock(&readOnlyGlobals.ticksLock);
}
if(readOnlyGlobals.enable_l7_protocol_discovery) {
// printf("--->>> %u\n", readOnlyGlobals.l7.proto.ndpi.flow_struct_size+2*readOnlyGlobals.l7.proto.ndpi.proto_size);
if((bkt->core.l7.proto.ndpi.flow = calloc(1, readOnlyGlobals.l7.flow_struct_size)) == NULL)
goto bkt_failure;
bkt->core.l7.proto.ndpi.src = malloc(readOnlyGlobals.l7.proto_size);
bkt->core.l7.proto.ndpi.dst = malloc(readOnlyGlobals.l7.proto_size);
if((bkt->core.l7.proto.ndpi.src == NULL) || (bkt->core.l7.proto.ndpi.dst == NULL))
goto bkt_failure;
bkt->core.l7.proto.ndpi.ndpi_proto = NDPI_PROTOCOL_UNKNOWN;
}
bkt->ext = (FlowHashExtendedBucket*)calloc(1, sizeof(FlowHashExtendedBucket));
if(bkt->ext == NULL)
goto bkt_failure;
if(readOnlyGlobals.enableExtBucket) {
bkt->ext->extensions = (FlowHashBucketExtensions*)calloc(1, sizeof(FlowHashBucketExtensions));
if(bkt->ext->extensions == NULL)
goto bkt_failure;
}
if(bkt->ext)
bkt->ext->thread_id = thread_id;
#if 0
if(readWriteGlobals->exportBucketsLen < 16)
traceEvent(TRACE_NORMAL, "[+] bucketsAllocated=%u",
readWriteGlobals->bucketsAllocated);
#endif
bkt->core.tuple.flow_serial = 0;
if(proto == 1) readWriteGlobals->accumulateStats[thread_id].icmpFlows++;
else if(proto == 6) readWriteGlobals->accumulateStats[thread_id].tcpFlows++;
else if(proto == 17) readWriteGlobals->accumulateStats[thread_id].udpFlows++;
bkt->magic = MAGIC_NUMBER;
if(unlikely(readOnlyGlobals.tracePerformance)) {
ticks diff = getticks() - when;
if(unlikely(readOnlyGlobals.useLocks)) pthread_rwlock_wrlock(&readOnlyGlobals.ticksLock);
readOnlyGlobals.bucketAllocationTicks += diff, readOnlyGlobals.num_allocated_buckets++;
if(unlikely(readOnlyGlobals.useLocks)) pthread_rwlock_unlock(&readOnlyGlobals.ticksLock);
}
if(unlikely(readOnlyGlobals.useLocks))
pthread_rwlock_wrlock(&readWriteGlobals->expireListLock);
if(readWriteGlobals->expireFlowListHead[thread_id] == NULL) {
/* The only entry of the list */
readWriteGlobals->expireFlowListHead[thread_id] = readWriteGlobals->expireFlowListTail[thread_id] = bkt;
} else {
/* The list is already populated: append at the end */
readWriteGlobals->expireFlowListTail[thread_id]->core.max_duration.next = bkt;
bkt->core.max_duration.prev = readWriteGlobals->expireFlowListTail[thread_id];
readWriteGlobals->expireFlowListTail[thread_id] = bkt;
}
/* Append it to the idle flow list */
if(readWriteGlobals->idleFlowListHead[thread_id] == NULL) {
/* The only entry of the list */
readWriteGlobals->idleFlowListHead[thread_id] = readWriteGlobals->idleFlowListTail[thread_id] = bkt;
} else {
/* The list is already populated: append */
readWriteGlobals->idleFlowListTail[thread_id]->core.no_traffic.next = bkt;
bkt->core.no_traffic.prev = readWriteGlobals->idleFlowListTail[thread_id];
readWriteGlobals->idleFlowListTail[thread_id] = bkt;
}
if(unlikely(readOnlyGlobals.useLocks))
pthread_rwlock_unlock(&readWriteGlobals->expireListLock);
if(unlikely(readOnlyGlobals.tracePerformance)) {
ticks diff = getticks() - when;
if(unlikely(readOnlyGlobals.useLocks)) pthread_rwlock_wrlock(&readOnlyGlobals.ticksLock);
readOnlyGlobals.bucketAllocationTicks += diff, readOnlyGlobals.num_allocated_buckets++;
if(unlikely(readOnlyGlobals.useLocks)) pthread_rwlock_unlock(&readOnlyGlobals.ticksLock);
}
incAtomic(&readWriteGlobals->bucketsAllocated, 1);
/* This is the return point in case of succefull allocation */
return(bkt);
bkt_failure:
if(!once) {
traceEvent(TRACE_ERROR, "NULL bkt (not enough memory?)");
once = 1;
}
purgeBucket(bkt);
return(NULL);
}
/* ****************************************************** */
static void updateHost(HostInfo *host, IpAddress *addr, u_int32_t ifHost, u_int16_t ifIdx) {
host->ifHost = ifHost, host->ifIdx = ifIdx;
}
/* ****************************************************** */
static u_int32_t hostHash(IpAddress *host) {
if(host->ipVersion == 4)
return(host->ipType.ipv4);
else
return(host->ipType.ipv6.s6_addr32[0]
+ host->ipType.ipv6.s6_addr32[1]
+ host->ipType.ipv6.s6_addr32[2]
+ host->ipType.ipv6.s6_addr32[3]);
}
/* ****************************************************** */
#ifdef ACCURATE_HASH
static void sortFlowIndex(struct flow_index *to_index) {
u_int32_t u32;
u_int32_t u16;
if(to_index->sport == to_index->dport) {
/* Sort on host */
if(to_index->srcHost <= to_index->dstHost)
return; /* Nothing to do */
else {
/* Just swap hosts */
u32 = to_index->srcHost;
to_index->srcHost = to_index->dstHost;
to_index->dstHost = u32;
}
} else if(to_index->sport < to_index->dport) {
return; /* Nothing to do */
} else /* to_index->sport > to_index->dport */ {
u32 = to_index->srcHost, u16 = to_index->sport;
to_index->srcHost = to_index->dstHost, to_index->sport = to_index->dport;
to_index->dstHost = u32, to_index->dport= u16;
}
}
/* ****************************************************** */
#if 1
/* http://burtleburtle.net/bob/hash/evahash.html */
/* The mixing step */
#define mix(a,b,c) \
{ \
a=a-b; a=a-c; a=a^(c>>13); \
b=b-c; b=b-a; b=b^(a<<8); \
c=c-a; c=c-b; c=c^(b>>13); \
a=a-b; a=a-c; a=a^(c>>12); \
b=b-c; b=b-a; b=b^(a<<16); \
c=c-a; c=c-b; c=c^(b>>5); \
a=a-b; a=a-c; a=a^(c>>3); \
b=b-c; b=b-a; b=b^(a<<10); \
c=c-a; c=c-b; c=c^(b>>15); \
}
#define mix64(a,b,c) \
{ \
a=a-b; a=a-c; a=a^(c>>43); \
b=b-c; b=b-a; b=b^(a<<9); \
c=c-a; c=c-b; c=c^(b>>8); \
a=a-b; a=a-c; a=a^(c>>38); \
b=b-c; b=b-a; b=b^(a<<23); \
c=c-a; c=c-b; c=c^(b>>5); \
a=a-b; a=a-c; a=a^(c>>35); \
b=b-c; b=b-a; b=b^(a<<49); \
c=c-a; c=c-b; c=c^(b>>11); \
a=a-b; a=a-c; a=a^(c>>12); \
b=b-c; b=b-a; b=b^(a<<18); \
c=c-a; c=c-b; c=c^(b>>22); \
}
/* The whole new hash function */
u_int32_t hashVal(const u_int8_t *k, /* the key */
u_int32_t length, /* the length of the key in bytes */
u_int32_t initval) /* the previous hash, or an arbitrary value */
{
u_int32_t a,b,c; /* the internal state */
u_int32_t len; /* how many key bytes still need mixing */
/* Set up the internal state */
len = length;
a = b = 0x9e3779b9; /* the golden ratio; an arbitrary value */
c = initval; /* variable initialization of internal state */
/*---------------------------------------- handle most of the key */
while (len >= 12)
{
a=a+(k[0]+((u_int32_t)k[1]<<8)+((u_int32_t)k[2]<<16) +((u_int32_t)k[3]<<24));
b=b+(k[4]+((u_int32_t)k[5]<<8)+((u_int32_t)k[6]<<16) +((u_int32_t)k[7]<<24));
c=c+(k[8]+((u_int32_t)k[9]<<8)+((u_int32_t)k[10]<<16)+((u_int32_t)k[11]<<24));
mix(a,b,c);
k = k+12; len = len-13;
}
/*------------------------------------- handle the last 11 bytes */
c = c+length;
switch(len) /* all the case statements fall through */
{
case 11: c=c+((u_int32_t)k[10]<<24);
case 10: c=c+((u_int32_t)k[9]<<16);
case 9 : c=c+((u_int32_t)k[8]<<8);
/* the first byte of c is reserved for the length */
case 8 : b=b+((u_int32_t)k[7]<<24);
case 7 : b=b+((u_int32_t)k[6]<<16);
case 6 : b=b+((u_int32_t)k[5]<<8);
case 5 : b=b+k[4];
case 4 : a=a+((u_int32_t)k[3]<<24);
case 3 : a=a+((u_int32_t)k[2]<<16);
case 2 : a=a+((u_int32_t)k[1]<<8);
case 1 : a=a+k[0];
/* case 0: nothing left to add */