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nprobe.c
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nprobe.c
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/*
* nProbe - a Netflow v5/v9/IPFIX probe for IPv4/v6
*
* Copyright (C) 2002-11 Luca Deri <[email protected]>
*
* 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.
*/
/* ************************************************************************
History:
1.0 [06/02] Initial release
1.3 [07/02] First public release
************************************************************************ */
#include "nprobe.h"
#define BLANK_SPACES " "
/* #define NETFLOW_DEBUG */
/* #define HASH_DEBUG */
/* #define TIME_PROTECTION */
#define MAX_SAMPLE_RATE ((u_short)-1)
/* *************************************** */
/*
#define OPTION_TEMPLATE "%SYSTEM_ID %SAMPLING_INTERVAL %SAMPLING_ALGORITHM %TOTAL_BYTES_EXP %TOTAL_PKTS_EXP %TOTAL_FLOWS_EXP %FLOW_ACTIVE_TIMEOUT %FLOW_INACTIVE_TIMEOUT"
*/
#define V9_OPTION_TEMPLATE "%TOTAL_FLOWS_EXP %TOTAL_PKTS_EXP"
/* IMPORTANT: when you modify it please also change exportBucketToNetflowV5 */
#define DEFAULT_V9_IPV4_TEMPLATE "%IPV4_SRC_ADDR %IPV4_DST_ADDR %IPV4_NEXT_HOP %INPUT_SNMP %OUTPUT_SNMP %IN_PKTS %IN_BYTES %FIRST_SWITCHED " \
"%LAST_SWITCHED %L4_SRC_PORT %L4_DST_PORT %TCP_FLAGS %PROTOCOL %SRC_TOS %SRC_AS %DST_AS %IPV4_SRC_MASK %IPV4_DST_MASK"
#define DEFAULT_V9_OPTION_TEMPLATE_ID (DEFAULT_TEMPLATE_ID+1)
#define TEMPLATE_PACKETS_DELTA 10
/* *********** Globals ******************* */
#ifdef HAVE_PF_RING
#include "pro/pf_ring.c"
#endif
/* ****************************************************** */
/* Forward */
static void checkExportQueuedFlows(int forceExport);
static void printStats(int force);
static void shutdown_nprobe(void);
static pthread_t *packetProcessThread;
static int parseOptions(int argc, char* argv[], u_int8_t reparse_options);
static void compileTemplates(u_int8_t reloadTemplate);
static int argc_;
static char **argv_;
#ifdef HAVE_OPTRESET
extern int optreset; /* defined by BSD, but not others */
#endif
static const struct option long_options[] = {
{ "all-collectors", required_argument, NULL, 'a' },
{ "as-list", required_argument, NULL, 'A' },
{ "verbose", required_argument, NULL, 'b' },
{ "count-delay", required_argument, NULL, 'B' },
{ "local-hosts-only", no_argument, NULL, 'c' },
{ "flow-lock", required_argument, NULL, 'C' },
{ "idle-timeout", required_argument, NULL, 'd' },
{ "dump-format", required_argument, NULL, 'D' },
{ "flow-delay", required_argument, NULL, 'e' },
{ "netflow-engine", required_argument, NULL, 'E' },
{ "bpf-filter", required_argument, NULL, 'f' },
{ "dump-frequency", required_argument, NULL, 'F' },
{ "pid-file", required_argument, NULL, 'g' },
#ifndef WIN32
{ "daemon-mode", no_argument, NULL, 'G' },
#endif
{ "help", no_argument, NULL, 'h' },
{ "interface", required_argument, NULL, 'i' },
{ "syslog", required_argument, NULL, 'I' },
{ "queue-timeout", required_argument, NULL, 'l' },
{ "local-networks", required_argument, NULL, 'L' },
{ "min-num-flows", required_argument, NULL, 'm' },
{ "max-num-flows", required_argument, NULL, 'M' },
{ "collector", required_argument, NULL, 'n' },
{ "rebuild-hash", no_argument, NULL, 'N' },
{ "flows-intra-templ", required_argument, NULL, 'o' },
{ "num-threads", required_argument, NULL, 'O' },
{ "aggregation", required_argument, NULL, 'p' },
{ "dump-path", required_argument, NULL, 'P' },
#ifdef IP_HDRINCL
{ "sender-address", required_argument, NULL, 'q' },
#endif
{ "out-iface-idx", required_argument, NULL, 'Q' },
{ "local-traffic-direction", no_argument, NULL, 'r' },
{ "payload-length", required_argument, NULL, 'R' },
{ "scan-cycle", required_argument, NULL, 's' },
{ "sample-rate", required_argument, NULL, 'S' },
{ "lifetime-timeout", required_argument, NULL, 't' },
{ "flow-templ", required_argument, NULL, 'T' },
{ "in-iface-idx", required_argument, NULL, 'u' },
{ "flow-templ-id", required_argument, NULL, 'U' },
{ "hash-size", required_argument, NULL, 'w' },
{ "no-ipv6", no_argument, NULL, 'W' },
{ "payload-policy", required_argument, NULL, 'x' },
{ "version", no_argument, NULL, 'v' },
{ "flow-version", required_argument, NULL, 'V' },
{ "min-flow-size", required_argument, NULL, 'z' },
#ifdef HAVE_MYSQL
{ "mysql", required_argument, NULL, '0' /* ignored */},
{ "mysql-skip-db-creation", no_argument, NULL, '0' /* ignored */},
#endif
{ "if-networks", required_argument, NULL, '1' },
{ "count", required_argument, NULL, '2' },
{ "collector-port", required_argument, NULL, '3' },
#ifdef linux
{ "cpu-affinity", required_argument, NULL, '4' },
#endif
{ "tunnel", no_argument, NULL, '5' },
/* Handled by the plugin */
{ "no-promisc", no_argument, NULL, '6' },
{ "smart-udp-frags", no_argument, NULL, '7' },
{ "ipsec-auth-data-len", required_argument, NULL, '8' },
{ "dump-stats", required_argument, NULL, '9' },
{ "black-list", required_argument, NULL, '!' },
{ "vlanid-as-iface-idx", no_argument, NULL, '@' },
{ "pcap-file-list", required_argument, NULL, '$' },
{ "csv-separator", required_argument, NULL, '^' },
{ "city-list", required_argument, NULL, ',' },
#ifdef HAVE_FASTBIT
{ "fastbit", required_argument, NULL, '[' },
{ "fastbit-rotation", required_argument, NULL, ']' },
{ "fastbit-template", required_argument, NULL, '(' },
#ifndef WIN32
{ "fastbit-index", required_argument, NULL, ')' },
#endif
{ "fastbit-exec", required_argument, NULL, '#' },
#endif
{ "dont-drop-privileges", no_argument, NULL, '\\' },
{ "bi-directional", no_argument, NULL, '{' },
{ "account-l2", no_argument, NULL, '}' },
{ "dump-metadata", required_argument, NULL, '=' },
{ "event-log", required_argument, NULL, '+' },
/*
Options for plugins. These options are not handled by the main
program but it's important to have them defined here otherwise we
get a warning from the probe
*/
{ "dont-hash-cookies", no_argument, NULL, 251 /* dummy */ },
{ "dont-nest-dump-dirs", no_argument, NULL, 251 /* dummy */ },
{ "max-http-log-lines", required_argument, NULL, 252 /* dummy */ },
{ "http-dump-dir", required_argument, NULL, 252 /* dummy */ },
{ "http-exec-cmd", required_argument, NULL, 252 /* dummy */ },
{ "max-mysql-log-lines", required_argument, NULL, 252 /* dummy */ },
{ "mysql-dump-dir", required_argument, NULL, 252 /* dummy */ },
{ "http-exec-cmd", required_argument, NULL, 252 /* dummy */ },
{ "dns-dump-dir", required_argument, NULL, 253 /* dummy */ },
{ "ntop-ng", required_argument, NULL, 254 /* dummy */ },
{ "bgp-port", required_argument, NULL, 255 /* dummy */ },
/* End of probe options */
{ NULL, no_argument, NULL, 0 }
};
/* ****************************************************** */
void printPcapStats(pcap_t *pcapPtr) {
struct pcap_stat pcapStat;
if(pcap_stats(pcapPtr, &pcapStat) >= 0) {
u_long rcvd_diff, drop_diff;
char msg[256];
/* Some pcap implementations resetthe stats at each call */
if(pcapStat.ps_recv >= readWriteGlobals->last_ps_recv) {
rcvd_diff = pcapStat.ps_recv-readWriteGlobals->last_ps_recv;
drop_diff = pcapStat.ps_drop-readWriteGlobals->last_ps_drop;
} else {
rcvd_diff = pcapStat.ps_recv, drop_diff = pcapStat.ps_drop;
}
snprintf(msg, sizeof(msg), "Packet stats: "
"%u/%u pkts rcvd/dropped [%.1f%%] [Last %lu/%lu pkts rcvd/dropped]",
pcapStat.ps_recv, pcapStat.ps_drop,
pcapStat.ps_recv > 0 ?
(float)(pcapStat.ps_drop*100)/(float)pcapStat.ps_recv : 0,
rcvd_diff, drop_diff);
traceEvent(TRACE_INFO, "%s", msg);
if(drop_diff > 0) dumpLogEvent(packet_drop, severity_warning, msg);
readWriteGlobals->last_ps_recv = pcapStat.ps_recv, readWriteGlobals->last_ps_drop = pcapStat.ps_drop;
} else {
#ifdef DEBUG
traceEvent(TRACE_WARNING, "Unable to read pcap statistics: %s",
pcap_geterr(pcapPtr));
#endif
}
}
/* ****************************************************** */
#ifndef WIN32
void reloadCLI(int signo) {
traceEvent(TRACE_NORMAL, "Received signal %d: reloading CLI options", signo);
parseOptions(argc_, argv_, 1);
}
/* ****************************************************** */
void cleanup(int signo) {
static u_char statsPrinted = 0;
if(!nprobe_up) exit(0);
if(!statsPrinted) {
statsPrinted = 1;
if(readOnlyGlobals.pcapPtr != NULL) {
printPcapStats(readOnlyGlobals.pcapPtr);
}
}
shutdown_nprobe();
/* exit(0); */
}
#endif
/* ****************************************************** */
#ifndef WIN32
void brokenPipe(int signo) {
#ifdef DEBUG
traceEvent(TRACE_WARNING, "Broken pipe (socket %d closed) ?\n", currSock);
#endif
signal(SIGPIPE, brokenPipe);
}
#endif
/* ****************************************************** */
void decodePacket(struct pcap_pkthdr *h, const u_char *p,
u_int8_t sampledPacket,
u_short numPkts, int input_index, int output_index,
u_int32_t flow_sender_ip) {
struct eth_header ehdr;
u_int caplen = h->caplen, length = h->len, offset = 0;
u_short eth_type, off=0;
u_int8_t tcpFlags = 0, proto = 0;
u_int32_t tunnel_id = 0, tcpSeqNum = 0;
struct ip ip = { 0 };
#ifndef IPV4_ONLY
struct ip6_hdr ipv6;
struct ip6_ext ipv6ext;
#endif
struct tcphdr tp = { 0 };
struct udphdr up = { 0 };
struct icmp_hdr icmpPkt = { 0 };
u_int16_t payload_shift = 0;
int originalPayloadLen = 0, payloadLen = 0; /* Do not set it to unsigned */
IpAddress src = { 0 }, dst = { 0 };
IpAddress untunneled_src = { 0 }, untunneled_dst = { 0 };
u_int16_t untunneled_sport = 0, untunneled_dport = 0;
u_int8_t untunneled_proto = 0;
u_short numFragments = 0;
u_int ehshift = 0;
#ifdef DEBUG
traceEvent(TRACE_INFO, ".");
#endif
if(readWriteGlobals->stopPacketCapture) return;
if(readOnlyGlobals.initialSniffTime.tv_sec == 0) {
/* Set it with the first incoming packet */
memcpy(&readOnlyGlobals.initialSniffTime, &h->ts, sizeof(struct timeval));
}
readWriteGlobals->now = h->ts.tv_sec;
if(caplen >= sizeof(struct eth_header)) {
u_int plen, hlen = 0, ip_len = 0;
u_short sport, dport, numMplsLabels = 0, tcp_len;
u_char mplsLabels[MAX_NUM_MPLS_LABELS][MPLS_LABEL_LEN];
u_int32_t null_type;
struct ppp_header ppphdr;
if(readOnlyGlobals.numProcessThreads > 1) pthread_rwlock_wrlock(&readWriteGlobals->statsRwLock);
readWriteGlobals->accumulateStats.pkts++, readWriteGlobals->accumulateStats.bytes += length;
readWriteGlobals->currentPkts++, readWriteGlobals->currentBytes += length;
if(readOnlyGlobals.numProcessThreads > 1) pthread_rwlock_unlock(&readWriteGlobals->statsRwLock);
// traceEvent(TRACE_INFO, "Datalink: %d", datalink);
switch(readOnlyGlobals.datalink) {
case DLT_ANY: /* Linux 'any' device */
eth_type = DLT_ANY;
memset(&ehdr, 0, sizeof(struct eth_header));
break;
case DLT_RAW: /* Raw packet data */
if(((p[0] & 0xF0) >> 4) == 4)
eth_type = ETHERTYPE_IP;
else
eth_type = ETHERTYPE_IPV6;
ehshift = 0;
break;
case DLT_NULL: /* loopaback interface */
ehshift = 4;
memcpy(&null_type, p, sizeof(u_int32_t));
//null_type = ntohl(null_type);
/* All this crap is due to the old little/big endian story... */
/* FIX !!!! */
switch(null_type) {
case BSD_AF_INET:
eth_type = ETHERTYPE_IP;
break;
case BSD_AF_INET6_BSD:
case BSD_AF_INET6_FREEBSD:
case BSD_AF_INET6_DARWIN:
eth_type = ETHERTYPE_IPV6;
break;
default:
return; /* Any other non IP protocol */
}
memset(&ehdr, 0, sizeof(struct eth_header));
break;
case DLT_PPP:
memcpy(&ppphdr, p, sizeof(struct ppp_header));
if(ntohs(ppphdr.proto) == 0x0021 /* IP */)
eth_type = ETHERTYPE_IP, ehshift = sizeof(struct ppp_header);
else
return;
break;
default:
ehshift = sizeof(struct eth_header);
memcpy(&ehdr, p, ehshift);
eth_type = ntohs(ehdr.ether_type);
break;
}
if((eth_type == ETHERTYPE_IP)
|| (eth_type == ETHERTYPE_IPV6)
|| (eth_type == ETHERTYPE_VLAN) /* Courtesy of Mikael Cam <[email protected]> - 2002/08/28 */
|| (eth_type == ETHERTYPE_MPLS)
|| (eth_type == ETHERTYPE_PPPoE)
|| (eth_type == DLT_NULL)
|| (eth_type == DLT_ANY)
|| (eth_type == 16385 /* MacOSX loopback */)
|| (eth_type == 16390 /* MacOSX loopback */)
) {
u_short vlanId = 0;
u_int estimatedLen = 0;
if(eth_type == ETHERTYPE_MPLS) {
char bos; /* bottom_of_stack */
memset(mplsLabels, 0, sizeof(mplsLabels));
bos = 0;
while(bos == 0) {
memcpy(&mplsLabels[numMplsLabels], p+ehshift, MPLS_LABEL_LEN);
bos = (mplsLabels[numMplsLabels][2] & 0x1), ehshift += 4, numMplsLabels++;
if((ehshift > caplen) || (numMplsLabels >= MAX_NUM_MPLS_LABELS))
return; /* bad packet */
}
eth_type = ETHERTYPE_IP;
} else if((eth_type == ETHERTYPE_IP) || (eth_type == ETHERTYPE_IPV6)) {
if((ehshift == 0) && (readOnlyGlobals.datalink != DLT_RAW)) /* still not set (used to handle the DLT_NULL case) */
ehshift = sizeof(struct eth_header);
} else if(eth_type == ETHERTYPE_PPPoE) {
eth_type = ETHERTYPE_IP, ehshift += 8;
} else if(eth_type == ETHERTYPE_VLAN) {
Ether80211q qType;
while(eth_type == ETHERTYPE_VLAN) {
memcpy(&qType, p+ehshift, sizeof(Ether80211q));
vlanId = ntohs(qType.vlanId) & 0xFFF;
eth_type = ntohs(qType.protoType);
ehshift += sizeof(qType);
/* printf("VlanId: %d\n", vlanId); <<<== NOT USED YET */
}
if(eth_type == 0x0800) {
/* Sanity check */
if(p[ehshift] == 0x60)
eth_type = ETHERTYPE_IPV6;
}
} else if(eth_type == DLT_ANY) {
ehshift += sizeof(AnyHeader);
eth_type = ntohs(((AnyHeader*)p)->protoType);
} else
ehshift += NULL_HDRLEN;
parse_ip:
if(eth_type == ETHERTYPE_IP) {
u_short ip_ip_len;
memcpy(&ip, p+ehshift, sizeof(struct ip));
if(ip.ip_v != 4) return; /* IP v4 only */
/* blacklist check */
if(isBlacklistedAddress(&ip.ip_src) || isBlacklistedAddress(&ip.ip_dst)) return;
ip_ip_len = htons(ip.ip_len);
ip_len = ((u_short)ip.ip_hl * 4);
estimatedLen = ehshift + ip_ip_len;
hlen = ip_len;
payloadLen = htons(ip.ip_len)-ip_len;
if(readOnlyGlobals.roundPacketLenWithIPHeaderLen)
length = estimatedLen;
src.ipVersion = 4, dst.ipVersion = 4;
if(readOnlyGlobals.ignoreIP || (readOnlyGlobals.setAllNonLocalHostsToZero && (!isLocalAddress(&ip.ip_src))))
src.ipType.ipv4 = 0; /* 0.0.0.0 */
else
src.ipType.ipv4 = ntohl(ip.ip_src.s_addr);
if(readOnlyGlobals.ignoreIP || (readOnlyGlobals.setAllNonLocalHostsToZero && (!isLocalAddress(&ip.ip_dst))))
dst.ipType.ipv4 = 0; /* 0.0.0.0 */
else
dst.ipType.ipv4 = ntohl(ip.ip_dst.s_addr);
proto = ip.ip_p;
off = ntohs(ip.ip_off) & 0x3fff;
numFragments = off ? 1 : 0;
#ifndef IPV4_ONLY
} else if(eth_type == ETHERTYPE_IPV6) {
u_short ipv6_ip_len;
if(readOnlyGlobals.disableIPv6) return;
memcpy(&ipv6, p+ehshift, sizeof(struct ip6_hdr));
if(((ipv6.ip6_vfc >> 4) & 0x0f) != 6) return; /* IP v6 only */
ipv6_ip_len = htons(ipv6.ip6_plen);
estimatedLen = sizeof(struct ip6_hdr)+ehshift+ipv6_ip_len;
if(readOnlyGlobals.roundPacketLenWithIPHeaderLen)
length = estimatedLen;
hlen = sizeof(struct ip6_hdr);
src.ipVersion = 6, dst.ipVersion = 6;
payloadLen = ipv6_ip_len - hlen;
/* FIX: blacklist check for IPv6 */
/* FIX: isLocalAddress doesn't work with IPv6 */
if(readOnlyGlobals.ignoreIP)
memset(&src.ipType.ipv6, 0, sizeof(struct in6_addr));
else
memcpy(&src.ipType.ipv6, &ipv6.ip6_src, sizeof(struct in6_addr));
if(readOnlyGlobals.ignoreIP)
memset(&dst.ipType.ipv6, 0, sizeof(struct in6_addr));
else
memcpy(&dst.ipType.ipv6, &ipv6.ip6_dst, sizeof(struct in6_addr));
proto = ipv6.ip6_nxt; /* next header (protocol) */
if(proto == 0) {
/* IPv6 hop-by-hop option */
memcpy(&ipv6ext, p+ehshift+sizeof(struct ip6_hdr), sizeof(struct ip6_ext));
hlen += (ipv6ext.ip6e_len+1)*8;
proto = ipv6ext.ip6e_nxt;
}
#endif
} else
return; /* Anything else that's not IPv4/v6 */
originalPayloadLen = payloadLen;
plen = length-ehshift;
if(caplen > estimatedLen) caplen = estimatedLen;
payloadLen -= (estimatedLen-caplen);
sport = dport = 0; /* default */
offset = ehshift+hlen;
if(readOnlyGlobals.tunnel_mode) {
switch(proto) {
case IPPROTO_ESP:
/* http://www.unixwiz.net/techtips/iguide-ipsec.html */
if(payloadLen > readOnlyGlobals.ipsec_auth_data_len) {
proto = p[offset+payloadLen-readOnlyGlobals.ipsec_auth_data_len-1];
offset += 8;
}
break;
case IPPROTO_GRE:
{
struct gre_header gre;
memcpy(&gre, &p[offset], sizeof(gre));
gre.flags_and_version = ntohs(gre.flags_and_version);
gre.proto = ntohs(gre.proto);
offset += sizeof(struct gre_header);
if(gre.flags_and_version & GRE_HEADER_CHECKSUM) offset += 4;
if(gre.flags_and_version & GRE_HEADER_ROUTING) offset += 4;
if(gre.flags_and_version & GRE_HEADER_KEY) offset += 4;
if(gre.flags_and_version & GRE_HEADER_SEQ_NUM) offset += 4;
eth_type = gre.proto;
if(eth_type == 0x8881 /* CDMA2000 */) {
offset++; /* PPP in HDLC-Like Framing */
memcpy(&ppphdr, &p[offset], sizeof(struct ppp_header));
if(ntohs(ppphdr.proto) == 0x0021 /* IP */)
eth_type = ETHERTYPE_IP;
ehshift = sizeof(struct ppp_header)+offset;
} else
ehshift = offset;
memcpy(&untunneled_src, &src, sizeof(IpAddress)), memcpy(&untunneled_dst, &dst, sizeof(IpAddress));
untunneled_proto = proto, untunneled_sport = sport, untunneled_dport = dport;
goto parse_ip;
break;
}
}
}
switch(proto) {
case IPPROTO_TCP:
if(plen < (hlen+sizeof(struct tcphdr))) return; /* packet too short */
memcpy(&tp, p+offset, sizeof(struct tcphdr));
if(!readOnlyGlobals.ignorePorts) sport = ntohs(tp.th_sport);
if(!readOnlyGlobals.ignorePorts) dport = ntohs(tp.th_dport);
tcpFlags = tp.th_flags, tcpSeqNum = ntohl(tp.th_seq);
tcp_len = (tp.th_off * 4);
payloadLen -= tcp_len, originalPayloadLen -= tcp_len;
if(payloadLen > 0)
payload_shift = offset+tcp_len;
else {
payloadLen = 0;
payload_shift = 0;
}
break;
case IPPROTO_UDP:
if(plen < (hlen+sizeof(struct udphdr))) return; /* packet too short */
memcpy(&up, p+offset, sizeof(struct udphdr));
if(!readOnlyGlobals.ignorePorts) sport = ntohs(up.uh_sport);
if(!readOnlyGlobals.ignorePorts) dport = ntohs(up.uh_dport);
originalPayloadLen = payloadLen = ntohs(up.uh_ulen)-sizeof(struct udphdr);
if(payloadLen > 0)
payload_shift = offset+sizeof(struct udphdr);
else {
payloadLen = 0;
payload_shift = 0;
}
if((readOnlyGlobals.tunnel_mode) && (payloadLen > sizeof(struct gtp_header))) {
if(dport == GTP_DATA_PORT) {
struct gtp_header *gtp = (struct gtp_header*)&p[payload_shift];
u_int gtp_header_len = 8 /* min size of struct gtp_header */;
if(((gtp->flags & 0x30) == 0x30) /* GTPv1 */
&& (ntohs(gtp->total_length) >= (payloadLen-gtp_header_len))) {
tunnel_id = ntohl(gtp->tunnel_id);
/* Now compute gtp_header_len precisely */
if(gtp->flags & 0x04) gtp_header_len += 1; /* next_ext_header is present */
if(gtp->flags & 0x02) gtp_header_len += 2; /* sequence_number is present */
if(gtp->flags & 0x01) gtp_header_len += 1; /* pdu_number is present */
payload_shift += gtp_header_len;
ehshift = payload_shift;
if(p[payload_shift] == 0x60)
eth_type = ETHERTYPE_IPV6;
else
eth_type = ETHERTYPE_IP;
memcpy(&untunneled_src, &src, sizeof(IpAddress)), memcpy(&untunneled_dst, &dst, sizeof(IpAddress));
untunneled_proto = proto, untunneled_sport = sport, untunneled_dport = dport;
goto parse_ip;
}
}
}
#ifdef NETFLOW_DEBUG
if((payloadLen > 0)
&& (numFragments == 0) && (off == 0) /* Do not process fragmented packets */
&& ((dport == 2055)
|| (dport == 2057)
|| (dport == 9999)
|| (dport == 3000)
|| (dport == 6000)
)) {
/* traceEvent(TRACE_NORMAL, "Dissecting flow packets (%d bytes)", payloadLen); */
dissectNetFlow(0, (char*)&p[payload_shift], payloadLen);
return;
}
#endif
break;
case IPPROTO_ICMP:
case IPPROTO_ICMPV6:
if(plen < (hlen+sizeof(struct icmp_hdr))) return; /* packet too short */
memcpy(&icmpPkt, p+offset, sizeof(struct icmp_hdr));
payloadLen = caplen - offset- sizeof(struct icmp_hdr);
//traceEvent(TRACE_ERROR, "[icmp_type=%d][icmp_code=%d]", icmpPkt.icmp_type, icmpPkt.icmp_code);
if(!(readOnlyGlobals.ignorePorts || readOnlyGlobals.ignorePorts)) {
if(readOnlyGlobals.usePortsForICMP)
sport = 0, dport = (icmpPkt.icmp_type * 256) + icmpPkt.icmp_code;
}
if(payloadLen > 0) {
payload_shift = offset;
if(proto == IPPROTO_ICMP)
payload_shift += sizeof(struct icmp_hdr);
else
payload_shift += 64; /* ICMPv6 */
} else {
payloadLen = 0;
payload_shift = 0;
}
break;
default:
payloadLen = 0;
}
/* ************************************************ */
/* Is this is a fragment ?
NOTE: IPv6 doesn't have the concept of fragments
*/
if(readOnlyGlobals.handleFragments && (numFragments > 0)) {
u_short fragmentOffset = (off & 0x1FFF)*8, fragmentId = ntohs(ip.ip_id);
u_short fragment_list_idx = (src.ipType.ipv4 + dst.ipType.ipv4) % NUM_FRAGMENT_LISTS;
IpV4Fragment *list, *prev = NULL;
if((readOnlyGlobals.smart_udp_frags_mode == 0) || (proto != IPPROTO_UDP)) {
pthread_mutex_lock(&readWriteGlobals->fragmentMutex[fragment_list_idx]);
list = readWriteGlobals->fragmentsList[fragment_list_idx];
while(list != NULL) {
if((list->src == src.ipType.ipv4)
&& (list->dst == dst.ipType.ipv4)
&& (list->fragmentId == fragmentId))
break;
else {
if((h->ts.tv_sec-list->firstSeen) > 30 /* sec */) {
/* Purge expired fragment */
IpV4Fragment *next = list->next;
if(prev == NULL)
readWriteGlobals->fragmentsList[fragment_list_idx] = next;
else
prev->next = next;
free(list);
readWriteGlobals->fragmentListLen[fragment_list_idx]--;
list = next;
} else {
prev = list;
list = list->next;
}
}
}
if(list == NULL) {
/* Fragment not found */
IpV4Fragment *frag = (IpV4Fragment*)malloc(sizeof(IpV4Fragment));
/* We have enough memory */
if(frag != NULL) {
memset(frag, 0, sizeof(IpV4Fragment));
frag->next = readWriteGlobals->fragmentsList[fragment_list_idx];
readWriteGlobals->fragmentsList[fragment_list_idx] = frag;
frag->src = src.ipType.ipv4, frag->dst = dst.ipType.ipv4;
frag->fragmentId = fragmentId;
frag->firstSeen = h->ts.tv_sec;
list = frag, prev = NULL;;
readWriteGlobals->fragmentListLen[fragment_list_idx]++;
} else
traceEvent(TRACE_ERROR, "Not enough memory?");
}
if(list != NULL) {
if(fragmentOffset == 0)
list->sport = sport, list->dport = dport;
list->len += plen, list->numPkts++;
if(!(off & IP_MF)) {
/* last fragment->we know the total data size */
IpV4Fragment *next = list->next;
sport = list->sport, dport = list->dport;
plen = list->len, numPkts = list->numPkts;
/* We can now free the fragment */
if(prev == NULL)
readWriteGlobals->fragmentsList[fragment_list_idx] = next;
else
prev->next = next;
readWriteGlobals->fragmentListLen[fragment_list_idx]--;
free(list);
pthread_mutex_unlock(&readWriteGlobals->fragmentMutex[fragment_list_idx]);
numFragments = numPkts;
} else {
pthread_mutex_unlock(&readWriteGlobals->fragmentMutex[fragment_list_idx]);
/* More fragments: we'll handle the packet later */
return;
}
}
} else {
if(fragmentOffset > 0) {
/*
Ignore fragments that do not have the initial
fragmented packet info
*/
return;
} else {
/*
We use 2* because we want to be as precise as possible given
that we have at least two fragments, we account twice the
IP packt header
*/
plen = ntohs(up.uh_ulen)+2*ip_len, numPkts = 2;
}
}
}
/* ************************************************ */
#ifdef DEBUG
{
char buf[256], buf1[256];
printf("%2d) %s:%d -> %s:%d [len=%d][payloadLen=%d]\n",
ip.ip_p, _intoaV4(ip.ip_src.s_addr, buf, sizeof(buf)), sport,
_intoaV4(ip.ip_dst.s_addr, buf1, sizeof(buf1)), dport,
plen, payloadLen);
}
#endif
if((src.ipVersion == 4) && (src.ipType.ipv4 == 0)
&& (dst.ipType.ipv4 == 0) && (!(readOnlyGlobals.ignoreIP)))
return; /* Flow to skip */
queueParsedPkt(proto, numFragments, sampledPacket,
numPkts, ip.ip_tos,
vlanId, tunnel_id, &ehdr, &src, sport, &dst, dport,
untunneled_proto, &untunneled_src, untunneled_sport, &untunneled_dst, untunneled_dport,
readOnlyGlobals.accountL2Traffic ? h->len : plen,
tcpFlags, tcpSeqNum,
((proto == IPPROTO_ICMP) || (proto == IPPROTO_ICMPV6)) ? icmpPkt.icmp_type : 0,
((proto == IPPROTO_ICMP) || (proto == IPPROTO_ICMPV6)) ? icmpPkt.icmp_code : 0,
numMplsLabels, mplsLabels,
input_index, output_index,
(struct pcap_pkthdr*)h, (u_char*)p,
payload_shift, payloadLen,
originalPayloadLen, 0,
0, 0, 0, 0, 0 /* flow_sender_ip */);
}
#ifdef DEBUG
else {
if(traceMode)
traceEvent(TRACE_WARNING, "Unknown ethernet type: 0x%X (%d)",
eth_type, eth_type);
}
#endif
}
}
/* ****************************************************** */
void dummyProcessPacket(u_char *_deviceId,
const struct pcap_pkthdr *h,
const u_char *p) {
// traceEvent(TRACE_NORMAL, "Got %d bytes packet", h->len);
decodePacket((struct pcap_pkthdr*)h, p,
0 /* sampledPacket */, 1 /* numPkts */,
NO_INTERFACE_INDEX, NO_INTERFACE_INDEX,
0 /* flow_sender_ip */);
}
/* ****************************************************** */
void allocateHostHash(void) {
if(readOnlyGlobals.enableHostStats) {
readWriteGlobals->theHostHash =
(HostHashBucket**)calloc(readOnlyGlobals.hostHashSize, sizeof(HostHashBucket*));
if(readWriteGlobals->theHostHash == NULL) {
traceEvent(TRACE_ERROR, "Not enough memory");
exit(-1);
}
}
}
/* ****************************************************** */
void freeHostHash(void) {
if(readOnlyGlobals.enableHostStats) {
traceEvent(TRACE_INFO, "MISSING implement freeHostHash()");
}
}
/* ****************************************************** */
/* There's 1 dequeue thread per queue */
void* dequeuePackets(void* notused) {
u_long num, queue_id = (long)notused; /* Range 0..readOnlyGlobals.numProcessThreads */
PacketQueue *queue = &readWriteGlobals->packetQueue[queue_id];
traceEvent(TRACE_INFO, "Started dequeue packets thread id %d...\n", queue_id);
while(!readWriteGlobals->shutdownInProgress) {
QueuedPacket *slot = &queue->queue[queue->remove_idx];
/* Wait for packets */
while((num = queuedPkts(queue)) == 0) {
if(readWriteGlobals->shutdownInProgress) break;
if(0)
traceEvent(TRACE_ERROR, "No queued packets [num=%d][queue_id=%d][queued=%u/dequeued=%u]",
num, queue_id, queue->num_queued_pkts, queue->num_dequeued_pkts);
waitCondvar(&queue->dequeue_condvar);
}
if(readWriteGlobals->shutdownInProgress) break;
if(0) traceEvent(TRACE_ERROR, "packet dequeued[queue_id=%d][num_queued=%d]", queue_id, queuedPkts(queue));
processFlowPacket(slot->idx, queue_id,
slot->proto, slot->numFragments,
slot->sampledPacket,
slot->numPkts, slot->tos,
slot->vlanId, slot->tunnel_id,
&slot->ehdr,
&slot->src, slot->sport,
&slot->dst, slot->dport,
slot->untunneled_proto,
&slot->untunneled_src, slot->untunneled_sport,
&slot->untunneled_dst, slot->untunneled_dport,
slot->len, slot->tcpFlags,
slot->tcpSeqNum,
slot->icmpType, slot->icmpCode,
slot->numMplsLabels,
slot->mplsLabels,
slot->if_input, slot->if_output,
&slot->h, slot->p,
slot->payload_shift, slot->payloadLen,
slot->originalPayloadLen, slot->_firstSeen,
slot->src_as, slot->dst_as,
slot->src_mask, slot->dst_mask,
slot->flow_sender_ip);
queue->num_dequeued_pkts++,
queue->remove_idx = (queue->remove_idx + 1) % queue->queue_capacity;
signalCondvar(&queue->queue_condvar, 0);
}
traceEvent(TRACE_INFO, "Dequeue packets thread id %d is over...\n", queue_id);
return(NULL);
}
/* ****************************************************** */
void allocateFlowHash(int idx) {
u_int mallocSize = sizeof(FlowHashBucket*)*readOnlyGlobals.flowHashSize;
readWriteGlobals->theFlowHash[idx] = (FlowHashBucket**)calloc(1, mallocSize);
if(readWriteGlobals->theFlowHash[idx] == NULL) {
traceEvent(TRACE_ERROR, "Not enough memory");
exit(-1);
}
}
/* ****************************************************** */
static void msecSleep(u_int msSleep) {
#ifndef WIN32
struct timespec timeout;
timeout.tv_sec = 0, timeout.tv_nsec = 1000000*msSleep;
while((nanosleep(&timeout, &timeout) == -1) && (errno == EINTR))
; /* Do nothing */
#else
waitForNextEvent(msSleep);
#endif
}
/* ****************************************************** */
/*
From the tests carried on, the very best approach
is to have a periodic thread that scans for expired
flows.
*/
void* hashWalker(void* notused) {
u_short sleep_time, msSleep = 100;
long idx;
/* Wait until all the data structures have been allocated */
while(readWriteGlobals->theFlowHash[readOnlyGlobals.numProcessThreads-1] == NULL) ntop_sleep(1);
/* Align to the scan cycle */
sleep_time = readOnlyGlobals.scanCycle - (time(NULL) % readOnlyGlobals.scanCycle);
if(readOnlyGlobals.traceMode == 2)
traceEvent(TRACE_INFO, "Sleeping %d sec before walking hash for the first time", sleep_time);
ntop_sleep(sleep_time);
while((readWriteGlobals->shutdownInProgress == 0)
&& (readWriteGlobals->stopPacketCapture == 0)) {
struct timeval begin, end;
u_int msDiff;
gettimeofday(&begin, NULL);
for(idx=0; idx<readOnlyGlobals.numProcessThreads; idx++) {
if(readOnlyGlobals.rebuild_hash) {
int i;
traceEvent(TRACE_INFO, "[%d] Rebuilding hash...", idx);
/* stop all activities and create a new hash */
for(i=0; i<MAX_HASH_MUTEXES; i++) pthread_rwlock_wrlock(&readWriteGlobals->flowHashRwLock[idx][i]);
readWriteGlobals->thePrevFlowHash[idx] = readWriteGlobals->theFlowHash[idx];
allocateFlowHash(idx);
allocateHostHash();
for(i=0; i<MAX_HASH_MUTEXES; i++) pthread_rwlock_unlock(&readWriteGlobals->flowHashRwLock[idx][i]);
traceEvent(TRACE_INFO, "The hash has been rebuilt.");
}
walkHash(idx, readOnlyGlobals.rebuild_hash);
if(readWriteGlobals->thePrevFlowHash[idx] != NULL) {
free(readWriteGlobals->thePrevFlowHash[idx]);
readWriteGlobals->thePrevFlowHash[idx] = NULL;
}
#ifndef WIN32
sched_yield();
#endif
/* Relax a bit */
gettimeofday(&end, NULL);
msDiff = msTimeDiff(&end, &begin);
if(msSleep > msDiff) {
u_int diff = msSleep-msDiff;
/* traceEvent(TRACE_NORMAL, "Sleeping %u msec", diff); */
msecSleep(diff);
}
} /* for */
/* End of scan */
printStats(0);
checkNetFlowExport(0);
if(readOnlyGlobals.traceMode == 2)
traceEvent(TRACE_INFO, "Sleeping %d sec before walking hash...", readOnlyGlobals.scanCycle);