conntrack: add SCTP support

This patch adds SCTP support to the command line tool conntrack.

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

2 files changed, 249 insertions, 1 deletions

diff --git a/extensions/Makefile.am b/extensions/Makefile.am
index 70edf47..14293d0 100644
--- a/extensions/Makefile.am
+++ b/extensions/Makefile.am
@@ -2,7 +2,8 @@ include $(top_srcdir)/Make_global.am
 
 noinst_LTLIBRARIES = libct_proto_tcp.la libct_proto_udp.la \
 		     libct_proto_icmp.la libct_proto_icmpv6.la \
-		     libct_proto_unknown.la libct_proto_udplite.la
+		     libct_proto_unknown.la libct_proto_udplite.la \
+		     libct_proto_sctp.la
 
 libct_proto_tcp_la_SOURCES = libct_proto_tcp.c
 libct_proto_udp_la_SOURCES = libct_proto_udp.c
@@ -10,3 +11,4 @@ libct_proto_udplite_la_SOURCES = libct_proto_udplite.c
 libct_proto_icmp_la_SOURCES = libct_proto_icmp.c
 libct_proto_icmpv6_la_SOURCES = libct_proto_icmpv6.c
 libct_proto_unknown_la_SOURCES = libct_proto_unknown.c
+libct_proto_sctp_la_SOURCES = libct_proto_sctp.c
diff --git a/extensions/libct_proto_sctp.c b/extensions/libct_proto_sctp.c
new file mode 100644
index 0000000..f4c94df
--- /dev/null
+++ b/extensions/libct_proto_sctp.c
@@ -0,0 +1,246 @@
+/*
+ * (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_sctp.h>
+
+#include "conntrack.h"
+
+#ifndef IPPROTO_SCTP
+#define IPPROTO_SCTP 132
+#endif
+
+enum {
+	CT_SCTP_ORIG_SPORT	= (1 << 0),
+	CT_SCTP_ORIG_DPORT	= (1 << 1),
+	CT_SCTP_REPL_SPORT	= (1 << 2),
+	CT_SCTP_REPL_DPORT	= (1 << 3),
+	CT_SCTP_MASK_SPORT	= (1 << 4),
+	CT_SCTP_MASK_DPORT	= (1 << 5),
+	CT_SCTP_STATE		= (1 << 6),
+	CT_SCTP_EXPTUPLE_SPORT	= (1 << 7),
+	CT_SCTP_EXPTUPLE_DPORT	= (1 << 8),
+	CT_SCTP_ORIG_VTAG	= (1 << 9),
+	CT_SCTP_REPL_VTAG	= (1 << 10),
+};
+
+#define SCTP_OPT_MAX	14
+static struct option opts[SCTP_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 = "orig-vtag",		.has_arg = 1, .val = 10 },
+	{ .name = "reply-vtag",		.has_arg = 1, .val = 11 },
+	{ .name = "sport",		.has_arg = 1, .val = 1 }, /* alias */
+	{ .name = "dport",		.has_arg = 1, .val = 2 }, /* alias */
+	{0, 0, 0, 0}
+};
+
+static const char *sctp_optflags[SCTP_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",
+	[9] = "orig-vtag",
+	[10] = "reply-vtag",
+};
+
+static char sctp_commands_v_options[NUMBER_OF_CMD][SCTP_OPT_MAX] =
+/* Well, it's better than "Re: Sevilla vs Betis" */
+{
+	    	/* 1 2 3 4 5 6 7 8 9 10 11*/
+/*CT_LIST*/   	  {2,2,2,2,0,0,2,0,0,0,0},
+/*CT_CREATE*/	  {3,3,3,3,0,0,1,0,0,1,1},
+/*CT_UPDATE*/	  {2,2,2,2,0,0,2,0,0,2,2},
+/*CT_DELETE*/	  {2,2,2,2,0,0,2,0,0,0,0},
+/*CT_GET*/	  {3,3,3,3,0,0,2,0,0,2,2},
+/*CT_FLUSH*/	  {0,0,0,0,0,0,0,0,0,0,0},
+/*CT_EVENT*/	  {2,2,2,2,0,0,2,0,0,0,0},
+/*CT_VERSION*/	  {0,0,0,0,0,0,0,0,0,0,0},
+/*CT_HELP*/	  {0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_LIST*/	  {0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_CREATE*/	  {1,1,1,1,1,1,0,1,1,1,1},
+/*EXP_DELETE*/	  {1,1,1,1,0,0,0,0,0,0,0},
+/*EXP_GET*/	  {1,1,1,1,0,0,0,0,0,0,0},
+/*EXP_FLUSH*/	  {0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_EVENT*/	  {0,0,0,0,0,0,0,0,0,0,0},
+};
+
+static const char *sctp_states[SCTP_CONNTRACK_MAX] = {
+	[SCTP_CONNTRACK_NONE]			= "NONE",
+	[SCTP_CONNTRACK_CLOSED]			= "CLOSED",
+	[SCTP_CONNTRACK_COOKIE_WAIT]		= "COOKIE_WAIT",
+	[SCTP_CONNTRACK_COOKIE_ECHOED]		= "COOKIE_ECHOED",
+	[SCTP_CONNTRACK_ESTABLISHED]		= "ESTABLISHED",
+	[SCTP_CONNTRACK_SHUTDOWN_SENT]		= "SHUTDOWN_SENT",
+	[SCTP_CONNTRACK_SHUTDOWN_RECD]		= "SHUTDOWN_RECD",
+	[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]	= "SHUTDOWN_ACK_SENT",
+};
+
+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\tSCTP state, fe. ESTABLISHED\n");
+	fprintf(stdout, "  --orig-vtag\t\toriginal verification tag\n");
+	fprintf(stdout, "  --reply-vtag\t\treply verification tag\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;
+	u_int32_t vtag;
+
+	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_SCTP);
+		*flags |= CT_SCTP_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_SCTP);
+		*flags |= CT_SCTP_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_SCTP);
+		*flags |= CT_SCTP_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_SCTP);
+		*flags |= CT_SCTP_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_SCTP);
+		*flags |= CT_SCTP_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_SCTP);
+		*flags |= CT_SCTP_MASK_DPORT;
+		break;
+	case 7:
+		for (i=0; i<SCTP_CONNTRACK_MAX; i++) {
+			if (strcmp(optarg, sctp_states[i]) == 0) {
+				nfct_set_attr_u8(ct, ATTR_SCTP_STATE, i);
+				break;
+			}
+		}
+		if (i == SCTP_CONNTRACK_MAX)
+			exit_error(PARAMETER_PROBLEM,
+				   "unknown SCTP state `%s'", optarg);
+		*flags |= CT_SCTP_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_SCTP_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_SCTP_EXPTUPLE_DPORT;
+		break;
+	case 10:
+		vtag = htonl(atoi(optarg));
+		nfct_set_attr_u32(ct, ATTR_SCTP_VTAG_ORIG, vtag); 
+		*flags |= CT_SCTP_ORIG_VTAG;
+		break;
+	case 11:
+		vtag = htonl(atoi(optarg));
+		nfct_set_attr_u32(ct, ATTR_SCTP_VTAG_REPL, vtag); 
+		*flags |= CT_SCTP_REPL_VTAG;
+		break;
+	}
+	return 1;
+}
+
+#define SCTP_VALID_FLAGS_MAX   2
+static unsigned int dccp_valid_flags[SCTP_VALID_FLAGS_MAX] = {
+	CT_SCTP_ORIG_SPORT | CT_SCTP_ORIG_DPORT,
+	CT_SCTP_REPL_SPORT | CT_SCTP_REPL_DPORT,
+};
+
+static void
+final_check(unsigned int flags, unsigned int cmd, struct nf_conntrack *ct)
+{
+	int ret, partial;
+
+	ret = generic_opt_check(flags, SCTP_OPT_MAX,
+				sctp_commands_v_options[cmd], sctp_optflags,
+				dccp_valid_flags, SCTP_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-src-port' and "
+						      "`--reply-dst-port'");
+			break;
+		}
+	}
+}
+
+static struct ctproto_handler sctp = {
+	.name 			= "sctp",
+	.protonum		= IPPROTO_SCTP,
+	.parse_opts		= parse_options,
+	.final_check		= final_check,
+	.help			= help,
+	.opts			= opts,
+	.version		= VERSION,
+};
+
+void register_sctp(void)
+{
+	register_proto(&sctp);
+}