first step forward to merge conntrackd and conntrack into the same building chain

8 files changed, 648 insertions, 0 deletions

diff --git a/extensions/Makefile.am b/extensions/Makefile.am
new file mode 100644
index 0000000..5366ee3
--- /dev/null
+++ b/extensions/Makefile.am
@@ -0,0 +1,16 @@
+include $(top_srcdir)/Make_global.am
+
+AM_CFLAGS=-fPIC -Wall
+LIBS=
+
+pkglib_LTLIBRARIES = ct_proto_tcp.la ct_proto_udp.la		\
+		     ct_proto_icmp.la ct_proto_sctp.la
+
+ct_proto_tcp_la_SOURCES = libct_proto_tcp.c
+ct_proto_tcp_la_LDFLAGS = -module -avoid-version
+ct_proto_udp_la_SOURCES = libct_proto_udp.c
+ct_proto_udp_la_LDFLAGS = -module -avoid-version
+ct_proto_icmp_la_SOURCES = libct_proto_icmp.c
+ct_proto_icmp_la_LDFLAGS = -module -avoid-version
+ct_proto_sctp_la_SOURCES = libct_proto_sctp.c
+ct_proto_sctp_la_LDFLAGS = -module -avoid-version
diff --git a/extensions/libct_proto_icmp.c b/extensions/libct_proto_icmp.c
new file mode 100644
index 0000000..e7cb04d
--- /dev/null
+++ b/extensions/libct_proto_icmp.c
@@ -0,0 +1,108 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
+ *	       Harald Welte <laforge@netfilter.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.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <netinet/in.h> /* For htons */
+#include <netinet/ip_icmp.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_icmp.h>
+#include "conntrack.h"
+
+static struct option opts[] = {
+	{"icmp-type", 1, 0, '1'},
+	{"icmp-code", 1, 0, '2'},
+	{"icmp-id", 1, 0, '3'},
+	{0, 0, 0, 0}
+};
+
+static void help()
+{
+	fprintf(stdout, "--icmp-type            icmp type\n");
+	fprintf(stdout, "--icmp-code            icmp code\n");
+	fprintf(stdout, "--icmp-id              icmp id\n");
+}
+
+/* Add 1; spaces filled with 0. */
+static u_int8_t invmap[]
+	= { [ICMP_ECHO] = ICMP_ECHOREPLY + 1,
+	    [ICMP_ECHOREPLY] = ICMP_ECHO + 1,
+	    [ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
+	    [ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
+	    [ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
+	    [ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
+	    [ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
+	    [ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1};
+
+static int parse(char c, char *argv[], 
+		 struct nfct_tuple *orig,
+		 struct nfct_tuple *reply,
+		 struct nfct_tuple *exptuple,
+		 struct nfct_tuple *mask,
+		 union nfct_protoinfo *proto,
+		 unsigned int *flags)
+{
+	switch(c) {
+		case '1':
+			if (optarg) {
+				orig->l4dst.icmp.type = atoi(optarg);
+				reply->l4dst.icmp.type =
+					invmap[orig->l4dst.icmp.type] - 1;
+				*flags |= ICMP_TYPE;
+			}
+			break;
+		case '2':
+			if (optarg) {
+				orig->l4dst.icmp.code = atoi(optarg);
+				reply->l4dst.icmp.code = 0;
+				*flags |= ICMP_CODE;
+			}
+			break;
+		case '3':
+			if (optarg) {
+				orig->l4src.icmp.id = htons(atoi(optarg));
+				reply->l4dst.icmp.id = 0;
+				*flags |= ICMP_ID;
+			}
+			break;
+	}
+	return 1;
+}
+
+static int final_check(unsigned int flags,
+		       unsigned int command,
+		       struct nfct_tuple *orig,
+		       struct nfct_tuple *reply)
+{
+	if (!(flags & ICMP_TYPE))
+		return 0;
+	else if (!(flags & ICMP_CODE))
+		return 0;
+
+	return 1;
+}
+
+static struct ctproto_handler icmp = {
+	.name 		= "icmp",
+	.protonum	= IPPROTO_ICMP,
+	.parse_opts	= parse,
+	.final_check	= final_check,
+	.help		= help,
+	.opts		= opts,
+	.version	= VERSION,
+};
+
+static void __attribute__ ((constructor)) init(void);
+
+static void init(void)
+{
+	register_proto(&icmp);
+}
diff --git a/extensions/libct_proto_icmp.man b/extensions/libct_proto_icmp.man
new file mode 100644
index 0000000..3b860d0
--- /dev/null
+++ b/extensions/libct_proto_icmp.man
@@ -0,0 +1,10 @@
+This module matches on ICMP-specific fields.
+.TP
+.BI "--icmp-type " "TYPE"
+ICMP Type. Has to be specified numerically.
+.TP
+.BI "--icmp-code " "CODE"
+ICMP Code. Has to be specified numerically.
+.TP
+.BI "--icmp-id " "ID"
+ICMP Id. Has to be specified numerically.
diff --git a/extensions/libct_proto_sctp.c b/extensions/libct_proto_sctp.c
new file mode 100644
index 0000000..1c8f0d1
--- /dev/null
+++ b/extensions/libct_proto_sctp.c
@@ -0,0 +1,164 @@
+/*
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *     2006 by Pablo Neira Ayuso <pablo@netfilter.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.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h> /* For htons */
+#include "conntrack.h"
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_sctp.h>
+
+static struct option opts[] = {
+	{"orig-port-src", 1, 0, '1'},
+	{"orig-port-dst", 1, 0, '2'},
+	{"reply-port-src", 1, 0, '3'},
+	{"reply-port-dst", 1, 0, '4'},
+	{"state", 1, 0, '5'},
+	{"tuple-port-src", 1, 0, '6'},
+	{"tuple-port-dst", 1, 0, '7'},
+	{0, 0, 0, 0}
+};
+
+static const char *states[] = {
+	"NONE",
+	"CLOSED",
+	"COOKIE_WAIT",
+	"COOKIE_ECHOED",
+	"ESTABLISHED",
+	"SHUTDOWN_SENT",
+	"SHUTDOWN_RECV",
+	"SHUTDOWN_ACK_SENT",
+};
+
+static void help()
+{
+	fprintf(stdout, "--orig-port-src        original source port\n");
+	fprintf(stdout, "--orig-port-dst        original destination port\n");
+	fprintf(stdout, "--reply-port-src       reply source port\n");
+	fprintf(stdout, "--reply-port-dst       reply destination port\n");
+	fprintf(stdout, "--state                SCTP state, fe. ESTABLISHED\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple src port\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple dst port\n");
+}
+
+static int parse_options(char c, char *argv[], 
+			 struct nfct_tuple *orig,
+			 struct nfct_tuple *reply,
+			 struct nfct_tuple *exptuple,
+			 struct nfct_tuple *mask,
+			 union nfct_protoinfo *proto,
+			 unsigned int *flags)
+{
+	switch(c) {
+		case '1':
+			if (optarg) {
+				orig->l4src.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_ORIG_SPORT;
+			}
+			break;
+		case '2':
+			if (optarg) {
+				orig->l4dst.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_ORIG_DPORT;
+			}
+			break;
+		case '3':
+			if (optarg) {
+				reply->l4src.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_REPL_SPORT;
+			}
+			break;
+		case '4':
+			if (optarg) {
+				reply->l4dst.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_REPL_DPORT;
+			}
+			break;
+		case '5':
+			if (optarg) {
+				int i;
+				for (i=0; i<10; i++) {
+					if (strcmp(optarg, states[i]) == 0) {
+						/* FIXME: Add state to
+						 * nfct_protoinfo
+						proto->sctp.state = i; */
+						break;
+					}
+				}
+				if (i == 10) {
+					printf("doh?\n");
+					return 0;
+				}
+				*flags |= SCTP_STATE;
+			}
+			break;
+		case '6':
+			if (optarg) {
+				exptuple->l4src.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_EXPTUPLE_SPORT;
+			}
+			break;
+		case '7':
+			if (optarg) {
+				exptuple->l4dst.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_EXPTUPLE_DPORT;
+			}
+
+	}
+	return 1;
+}
+
+static int final_check(unsigned int flags,
+		       unsigned int command,
+		       struct nfct_tuple *orig,
+		       struct nfct_tuple *reply)
+{
+	int ret = 0;
+	
+	if ((flags & (SCTP_ORIG_SPORT|SCTP_ORIG_DPORT)) 
+	    && !(flags & (SCTP_REPL_SPORT|SCTP_REPL_DPORT))) {
+		reply->l4src.sctp.port = orig->l4dst.sctp.port;
+		reply->l4dst.sctp.port = orig->l4src.sctp.port;
+		ret = 1;
+	} else if (!(flags & (SCTP_ORIG_SPORT|SCTP_ORIG_DPORT))
+	            && (flags & (SCTP_REPL_SPORT|SCTP_REPL_DPORT))) {
+		orig->l4src.sctp.port = reply->l4dst.sctp.port;
+		orig->l4dst.sctp.port = reply->l4src.sctp.port;
+		ret = 1;
+	}
+	if ((flags & (SCTP_ORIG_SPORT|SCTP_ORIG_DPORT)) 
+	    && ((flags & (SCTP_REPL_SPORT|SCTP_REPL_DPORT))))
+		ret = 1;
+
+	/* --state is missing and we are trying to create a conntrack */
+	if (ret && (command & CT_CREATE) && (!(flags & SCTP_STATE)))
+		ret = 0;
+
+	return ret;
+}
+
+static struct ctproto_handler sctp = {
+	.name 			= "sctp",
+	.protonum		= IPPROTO_SCTP,
+	.parse_opts		= parse_options,
+	.final_check		= final_check,
+	.help			= help,
+	.opts			= opts,
+	.version		= VERSION,
+};
+
+static void __attribute__ ((constructor)) init(void);
+
+static void init(void)
+{
+	register_proto(&sctp);
+}
diff --git a/extensions/libct_proto_tcp.c b/extensions/libct_proto_tcp.c
new file mode 100644
index 0000000..ee24206
--- /dev/null
+++ b/extensions/libct_proto_tcp.c
@@ -0,0 +1,180 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ *      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.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h> /* For htons */
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_tcp.h>
+
+#include "conntrack.h"
+
+static struct option opts[] = {
+	{"orig-port-src", 1, 0, '1'},
+	{"orig-port-dst", 1, 0, '2'},
+	{"reply-port-src", 1, 0, '3'},
+	{"reply-port-dst", 1, 0, '4'},
+	{"mask-port-src", 1, 0, '5'},
+	{"mask-port-dst", 1, 0, '6'},
+	{"state", 1, 0, '7'},
+	{"tuple-port-src", 1, 0, '8'},
+	{"tuple-port-dst", 1, 0, '9'},
+	{0, 0, 0, 0}
+};
+
+static const char *states[] = {
+	"NONE",
+	"SYN_SENT",
+	"SYN_RECV",
+	"ESTABLISHED",
+	"FIN_WAIT",
+	"CLOSE_WAIT",
+	"LAST_ACK",
+	"TIME_WAIT",
+	"CLOSE",
+	"LISTEN"
+};
+
+static void help()
+{
+	fprintf(stdout, "--orig-port-src        original source port\n");
+	fprintf(stdout, "--orig-port-dst        original destination port\n");
+	fprintf(stdout, "--reply-port-src       reply source port\n");
+	fprintf(stdout, "--reply-port-dst       reply destination port\n");
+	fprintf(stdout, "--mask-port-src	mask source port\n");
+	fprintf(stdout, "--mask-port-dst	mask destination port\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple src port\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple dst port\n");
+	fprintf(stdout, "--state                TCP state, fe. ESTABLISHED\n");
+}
+
+static int parse_options(char c, char *argv[], 
+			 struct nfct_tuple *orig,
+			 struct nfct_tuple *reply,
+			 struct nfct_tuple *exptuple,
+			 struct nfct_tuple *mask,
+			 union nfct_protoinfo *proto,
+			 unsigned int *flags)
+{
+	switch(c) {
+		case '1':
+			if (optarg) {
+				orig->l4src.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_ORIG_SPORT;
+			}
+			break;
+		case '2':
+			if (optarg) {
+				orig->l4dst.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_ORIG_DPORT;
+			}
+			break;
+		case '3':
+			if (optarg) {
+				reply->l4src.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_REPL_SPORT;
+			}
+			break;
+		case '4':
+			if (optarg) {
+				reply->l4dst.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_REPL_DPORT;
+			}
+			break;
+		case '5':
+			if (optarg) {
+				mask->l4src.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_MASK_SPORT;
+			}
+			break;
+		case '6':
+			if (optarg) {
+				mask->l4dst.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_MASK_DPORT;
+			}
+			break;
+		case '7':
+			if (optarg) {
+				int i;
+				for (i=0; i<10; i++) {
+					if (strcmp(optarg, states[i]) == 0) {
+						proto->tcp.state = i;
+						break;
+					}
+				}
+				if (i == 10) {
+					printf("doh?\n");
+					return 0;
+				}
+				*flags |= TCP_STATE;
+			}
+			break;
+		case '8':
+			if (optarg) {
+				exptuple->l4src.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_EXPTUPLE_SPORT;
+			}
+			break;
+		case '9':
+			if (optarg) {
+				exptuple->l4dst.tcp.port = htons(atoi(optarg));
+				*flags |= TCP_EXPTUPLE_DPORT;
+			}
+			break;
+	}
+	return 1;
+}
+
+static int final_check(unsigned int flags,
+		       unsigned int command,
+		       struct nfct_tuple *orig,
+		       struct nfct_tuple *reply)
+{
+	int ret = 0;
+	
+	if ((flags & (TCP_ORIG_SPORT|TCP_ORIG_DPORT)) 
+	    && !(flags & (TCP_REPL_SPORT|TCP_REPL_DPORT))) {
+		reply->l4src.tcp.port = orig->l4dst.tcp.port;
+		reply->l4dst.tcp.port = orig->l4src.tcp.port;
+		ret = 1;
+	} else if (!(flags & (TCP_ORIG_SPORT|TCP_ORIG_DPORT))
+	            && (flags & (TCP_REPL_SPORT|TCP_REPL_DPORT))) {
+		orig->l4src.tcp.port = reply->l4dst.tcp.port;
+		orig->l4dst.tcp.port = reply->l4src.tcp.port;
+		ret = 1;
+	}
+	if ((flags & (TCP_ORIG_SPORT|TCP_ORIG_DPORT)) 
+	    && ((flags & (TCP_REPL_SPORT|TCP_REPL_DPORT))))
+		ret = 1;
+
+	/* --state is missing and we are trying to create a conntrack */
+	if (ret && (command & CT_CREATE) && (!(flags & TCP_STATE)))
+		ret = 0;
+
+	return ret;
+}
+
+static struct ctproto_handler tcp = {
+	.name 			= "tcp",
+	.protonum		= IPPROTO_TCP,
+	.parse_opts		= parse_options,
+	.final_check		= final_check,
+	.help			= help,
+	.opts			= opts,
+	.version		= VERSION,
+};
+
+static void __attribute__ ((constructor)) init(void);
+
+static void init(void)
+{
+	register_proto(&tcp);
+}
diff --git a/extensions/libct_proto_tcp.man b/extensions/libct_proto_tcp.man
new file mode 100644
index 0000000..41783f8
--- /dev/null
+++ b/extensions/libct_proto_tcp.man
@@ -0,0 +1,16 @@
+This module matches on TCP-specific fields.
+.TP
+.BI "--orig-port-src " "PORT"
+Source port in original direction
+.TP
+.BI "--orig-port-dst " "PORT"
+Destination port in original direction
+.TP
+.BI "--reply-port-src " "PORT"
+Source port in reply direction
+.TP
+.BI "--reply-port-dst " "PORT"
+Destination port in reply direction
+.TP
+.BI "--state " "[NONE|SYN_SENT|SYN_RECV|ESTABLISHED|FIN_WAIT|CLOSE_WAIT|LAST_ACK|TIME_WAIT|CLOSE|LISTEN]"
+TCP state
diff --git a/extensions/libct_proto_udp.c b/extensions/libct_proto_udp.c
new file mode 100644
index 0000000..48079e0
--- /dev/null
+++ b/extensions/libct_proto_udp.c
@@ -0,0 +1,141 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ *      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.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <netinet/in.h> /* For htons */
+#include "conntrack.h"
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_udp.h>
+
+static struct option opts[] = {
+	{"orig-port-src", 1, 0, '1'},
+	{"orig-port-dst", 1, 0, '2'},
+	{"reply-port-src", 1, 0, '3'},
+	{"reply-port-dst", 1, 0, '4'},
+	{"mask-port-src", 1, 0, '5'},
+	{"mask-port-dst", 1, 0, '6'},
+	{"tuple-port-src", 1, 0, '7'},
+	{"tuple-port-dst", 1, 0, '8'},
+	{0, 0, 0, 0}
+};
+
+static void help()
+{
+	fprintf(stdout, "--orig-port-src        original source port\n");
+	fprintf(stdout, "--orig-port-dst        original destination port\n");
+	fprintf(stdout, "--reply-port-src       reply source port\n");
+	fprintf(stdout, "--reply-port-dst       reply destination port\n");
+	fprintf(stdout, "--mask-port-src	mask source port\n");
+	fprintf(stdout, "--mask-port-dst	mask destination port\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple src port\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple dst port\n");
+}
+
+static int parse_options(char c, char *argv[], 
+			 struct nfct_tuple *orig,
+			 struct nfct_tuple *reply,
+			 struct nfct_tuple *exptuple,
+			 struct nfct_tuple *mask,
+			 union nfct_protoinfo *proto,
+			 unsigned int *flags)
+{
+	switch(c) {
+		case '1':
+			if (optarg) {
+				orig->l4src.udp.port = htons(atoi(optarg));
+				*flags |= UDP_ORIG_SPORT;
+			}
+			break;
+		case '2':
+			if (optarg) {
+				orig->l4dst.udp.port = htons(atoi(optarg));
+				*flags |= UDP_ORIG_DPORT;
+			}
+			break;
+		case '3':
+			if (optarg) {
+				reply->l4src.udp.port = htons(atoi(optarg));
+				*flags |= UDP_REPL_SPORT;
+			}
+			break;
+		case '4':
+			if (optarg) {
+				reply->l4dst.udp.port = htons(atoi(optarg));
+				*flags |= UDP_REPL_DPORT;
+			}
+			break;
+		case '5':
+			if (optarg) {
+				mask->l4src.udp.port = htons(atoi(optarg));
+				*flags |= UDP_MASK_SPORT;
+			}
+			break;
+		case '6':
+			if (optarg) {
+				mask->l4dst.udp.port = htons(atoi(optarg));
+				*flags |= UDP_MASK_DPORT;
+			}
+			break;
+		case '7':
+			if (optarg) {
+				exptuple->l4src.udp.port = htons(atoi(optarg));
+				*flags |= UDP_EXPTUPLE_SPORT;
+			}
+			break;
+		case '8':
+			if (optarg) {
+				exptuple->l4dst.udp.port = htons(atoi(optarg));
+				*flags |= UDP_EXPTUPLE_DPORT;
+			}
+
+	}
+	return 1;
+}
+
+static int final_check(unsigned int flags,
+		       unsigned int command,
+		       struct nfct_tuple *orig,
+		       struct nfct_tuple *reply)
+{
+	if ((flags & (UDP_ORIG_SPORT|UDP_ORIG_DPORT)) 
+	    && !(flags & (UDP_REPL_SPORT|UDP_REPL_DPORT))) {
+		reply->l4src.udp.port = orig->l4dst.udp.port;
+		reply->l4dst.udp.port = orig->l4src.udp.port;
+		return 1;
+	} else if (!(flags & (UDP_ORIG_SPORT|UDP_ORIG_DPORT))
+	            && (flags & (UDP_REPL_SPORT|UDP_REPL_DPORT))) {
+		orig->l4src.udp.port = reply->l4dst.udp.port;
+		orig->l4dst.udp.port = reply->l4src.udp.port;
+		return 1;
+	}
+	if ((flags & (UDP_ORIG_SPORT|UDP_ORIG_DPORT)) 
+	    && ((flags & (UDP_REPL_SPORT|UDP_REPL_DPORT))))
+		return 1;
+
+	return 0;
+}
+
+static struct ctproto_handler udp = {
+	.name 			= "udp",
+	.protonum		= IPPROTO_UDP,
+	.parse_opts		= parse_options,
+	.final_check		= final_check,
+	.help			= help,
+	.opts			= opts,
+	.version		= VERSION,
+};
+
+static void __attribute__ ((constructor)) init(void);
+
+static void init(void)
+{
+	register_proto(&udp);
+}
diff --git a/extensions/libct_proto_udp.man b/extensions/libct_proto_udp.man
new file mode 100644
index 0000000..c67fedf
--- /dev/null
+++ b/extensions/libct_proto_udp.man
@@ -0,0 +1,13 @@
+This module matches on UDP-specific fields.
+.TP
+.BI "--orig-port-src " "PORT"
+Source port in original direction
+.TP
+.BI "--orig-port-dst " "PORT"
+Destination port in original direction
+.TP
+.BI "--reply-port-src " "PORT"
+Source port in reply direction
+.TP
+.BI "--reply-port-dst " "PORT"
+Destination port in reply direction