conntrack: add DCCP support

This patch adds DCCP support for the command line tool conntrack.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 230 insertions, 0 deletions

diff --git a/extensions/libct_proto_dccp.c b/extensions/libct_proto_dccp.c
new file mode 100644
index 0000000..deb3e28
--- /dev/null
+++ b/extensions/libct_proto_dccp.c
@@ -0,0 +1,230 @@
+/*
+ * (C) 2009 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 <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_dccp.h>
+
+#include "conntrack.h"
+
+#ifndef IPPROTO_DCCP
+#define IPPROTO_DCCP 33
+#endif
+
+enum {
+	CT_DCCP_ORIG_SPORT	= (1 << 0),
+	CT_DCCP_ORIG_DPORT	= (1 << 1),
+	CT_DCCP_REPL_SPORT	= (1 << 2),
+	CT_DCCP_REPL_DPORT	= (1 << 3),
+	CT_DCCP_MASK_SPORT	= (1 << 4),
+	CT_DCCP_MASK_DPORT	= (1 << 5),
+	CT_DCCP_STATE		= (1 << 6),
+	CT_DCCP_EXPTUPLE_SPORT	= (1 << 7),
+	CT_DCCP_EXPTUPLE_DPORT	= (1 << 8)
+};
+
+#define DCCP_OPT_MAX	13
+static struct option opts[DCCP_OPT_MAX] = {
+	{ .name = "orig-port-src",	.has_arg = 1, .val = '1' },
+	{ .name = "orig-port-dst",	.has_arg = 1, .val = '2' },
+	{ .name = "reply-port-src",	.has_arg = 1, .val = '3' },
+	{ .name = "reply-port-dst",	.has_arg = 1, .val = '4' },
+	{ .name = "mask-port-src",	.has_arg = 1, .val = '5' },
+	{ .name = "mask-port-dst",	.has_arg = 1, .val = '6' },
+	{ .name = "state",		.has_arg = 1, .val = '7' },
+	{ .name = "tuple-port-src",	.has_arg = 1, .val = '8' },
+	{ .name = "tuple-port-dst",	.has_arg = 1, .val = '9' },
+	{ .name = "sport",		.has_arg = 1, .val = '1' }, /* alias */
+	{ .name = "dport",		.has_arg = 1, .val = '2' }, /* alias */
+	{ 0, 0, 0, 0},
+};
+
+static const char *dccp_optflags[DCCP_OPT_MAX] = {
+	[0] = "sport",
+	[1] = "dport",
+	[2] = "reply-port-src",
+	[3] = "reply-port-dst",
+	[4] = "mask-port-src",
+	[5] = "mask-port-dst",
+	[6] = "state",
+	[7] = "tuple-port-src",
+	[8] = "tuple-port-dst"
+};
+
+static char dccp_commands_v_options[NUMBER_OF_CMD][DCCP_OPT_MAX] =
+/* Well, it's better than "Re: Sevilla vs Betis" */
+{
+	    	/* 1 2 3 4 5 6 7 8 9 */
+/*CT_LIST*/   	  {2,2,2,2,0,0,2,0,0},
+/*CT_CREATE*/	  {3,3,3,3,0,0,1,0,0},
+/*CT_UPDATE*/	  {2,2,2,2,0,0,2,0,0},
+/*CT_DELETE*/	  {2,2,2,2,0,0,2,0,0},
+/*CT_GET*/	  {3,3,3,3,0,0,2,0,0},
+/*CT_FLUSH*/	  {0,0,0,0,0,0,0,0,0},
+/*CT_EVENT*/	  {2,2,2,2,0,0,2,0,0},
+/*CT_VERSION*/	  {0,0,0,0,0,0,0,0,0},
+/*CT_HELP*/	  {0,0,0,0,0,0,0,0,0},
+/*EXP_LIST*/	  {0,0,0,0,0,0,0,0,0},
+/*EXP_CREATE*/	  {1,1,1,1,1,1,0,1,1},
+/*EXP_DELETE*/	  {1,1,1,1,0,0,0,0,0},
+/*EXP_GET*/	  {1,1,1,1,0,0,0,0,0},
+/*EXP_FLUSH*/	  {0,0,0,0,0,0,0,0,0},
+/*EXP_EVENT*/	  {0,0,0,0,0,0,0,0,0},
+};
+
+static const char *dccp_states[DCCP_CONNTRACK_MAX] = {
+	[DCCP_CONNTRACK_NONE]		= "NONE",
+	[DCCP_CONNTRACK_REQUEST]	= "REQUEST",
+	[DCCP_CONNTRACK_RESPOND]	= "RESPOND",
+	[DCCP_CONNTRACK_PARTOPEN]	= "PARTOPEN",
+	[DCCP_CONNTRACK_OPEN]		= "OPEN",
+	[DCCP_CONNTRACK_CLOSEREQ]	= "CLOSEREQ",
+	[DCCP_CONNTRACK_CLOSING]	= "CLOSING",
+	[DCCP_CONNTRACK_TIMEWAIT]	= "TIMEWAIT",
+	[DCCP_CONNTRACK_IGNORE]		= "IGNORE",
+	[DCCP_CONNTRACK_INVALID]	= "INVALID",
+};
+
+static void help(void)
+{
+	fprintf(stdout, "  --orig-port-src\t\toriginal source port\n");
+	fprintf(stdout, "  --orig-port-dst\t\toriginal destination port\n");
+	fprintf(stdout, "  --reply-port-src\t\treply source port\n");
+	fprintf(stdout, "  --reply-port-dst\t\treply destination port\n");
+	fprintf(stdout, "  --mask-port-src\t\tmask source port\n");
+	fprintf(stdout, "  --mask-port-dst\t\tmask destination port\n");
+	fprintf(stdout, "  --tuple-port-src\t\texpectation tuple src port\n");
+	fprintf(stdout, "  --tuple-port-src\t\texpectation tuple dst port\n");
+	fprintf(stdout, "  --state\t\t\tDCCP state, fe. RESPOND\n");
+}
+
+static int parse_options(char c,
+			 struct nf_conntrack *ct,
+			 struct nf_conntrack *exptuple,
+			 struct nf_conntrack *mask,
+			 unsigned int *flags)
+{
+	int i;
+	u_int16_t port;
+
+	switch(c) {
+	case '1':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(ct, ATTR_ORIG_PORT_SRC, port);
+		nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_DCCP);
+		*flags |= CT_DCCP_ORIG_SPORT;
+		break;
+	case '2':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(ct, ATTR_ORIG_PORT_DST, port);
+		nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_DCCP);
+		*flags |= CT_DCCP_ORIG_DPORT;
+		break;
+	case '3':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(ct, ATTR_REPL_PORT_SRC, port);
+		nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_DCCP);
+		*flags |= CT_DCCP_REPL_SPORT;
+		break;
+	case '4':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(ct, ATTR_REPL_PORT_DST, port);
+		nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_DCCP);
+		*flags |= CT_DCCP_REPL_DPORT;
+		break;
+	case '5':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(mask, ATTR_ORIG_PORT_SRC, port);
+		nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_DCCP);
+		*flags |= CT_DCCP_MASK_SPORT;
+		break;
+	case '6':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(mask, ATTR_ORIG_PORT_DST, port);
+		nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_DCCP);
+		*flags |= CT_DCCP_MASK_DPORT;
+		break;
+	case '7':
+		for (i=0; i<DCCP_CONNTRACK_MAX; i++) {
+			if (strcmp(optarg, dccp_states[i]) == 0) {
+				nfct_set_attr_u8(ct, ATTR_DCCP_STATE, i);
+				break;
+			}
+		}
+		if (i == DCCP_CONNTRACK_MAX)
+			exit_error(PARAMETER_PROBLEM,
+				   "Unknown DCCP state `%s'", optarg);
+		*flags |= CT_DCCP_STATE;
+		break;
+	case '8':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_SRC, port);
+		nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, port);
+		*flags |= CT_DCCP_EXPTUPLE_SPORT;
+		break;
+	case '9':
+		port = htons(atoi(optarg));
+		nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_DST, port); 
+		nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, port);
+		*flags |= CT_DCCP_EXPTUPLE_DPORT;
+		break;
+	}
+	return 1;
+}
+
+#define DCCP_VALID_FLAGS_MAX	2
+static unsigned int dccp_valid_flags[DCCP_VALID_FLAGS_MAX] = {
+	CT_DCCP_ORIG_SPORT | CT_DCCP_ORIG_DPORT,
+	CT_DCCP_REPL_SPORT | CT_DCCP_REPL_DPORT
+};
+
+static void 
+final_check(unsigned int flags, unsigned int cmd, struct nf_conntrack *ct)
+{
+	int ret, partial;
+
+	ret = generic_opt_check(flags, DCCP_OPT_MAX,
+				dccp_commands_v_options[cmd], dccp_optflags,
+				dccp_valid_flags, DCCP_VALID_FLAGS_MAX,
+				&partial);
+	if (!ret) {
+		switch(partial) {
+		case -1:
+		case 0:
+			exit_error(PARAMETER_PROBLEM, "you have to specify "
+						      "`--sport' and "
+						      "`--dport'");
+			break;
+		case 1:
+			exit_error(PARAMETER_PROBLEM, "you have to specify "
+						      "`--reply-port-src' and "
+						      "`--report-port-dst'");
+			break;
+		}
+	}
+}
+
+static struct ctproto_handler dccp = {
+	.name 			= "dccp",
+	.protonum		= IPPROTO_DCCP,
+	.parse_opts		= parse_options,
+	.final_check		= final_check,
+	.help			= help,
+	.opts			= opts,
+	.version		= VERSION,
+};
+
+void register_dccp(void)
+{
+	register_proto(&dccp);
+}