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-rw-r--r--extensions/libct_proto_dccp.c230
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);
+}