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-rw-r--r--extensions/Makefile.am4
-rw-r--r--extensions/libct_proto_sctp.c246
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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 05:05:08 +0000