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-rw-r--r--extensions/Makefile.am4
-rw-r--r--extensions/libct_proto_gre.c192
2 files changed, 195 insertions, 1 deletions
diff --git a/extensions/Makefile.am b/extensions/Makefile.am
index dc7bff5..c36c3a1 100644
--- a/extensions/Makefile.am
+++ b/extensions/Makefile.am
@@ -3,7 +3,8 @@ 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_sctp.la libct_proto_dccp.la
+ libct_proto_sctp.la libct_proto_dccp.la \
+ libct_proto_gre.la
libct_proto_tcp_la_SOURCES = libct_proto_tcp.c
libct_proto_udp_la_SOURCES = libct_proto_udp.c
@@ -13,3 +14,4 @@ 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
libct_proto_dccp_la_SOURCES = libct_proto_dccp.c
+libct_proto_gre_la_SOURCES = libct_proto_gre.c
diff --git a/extensions/libct_proto_gre.c b/extensions/libct_proto_gre.c
new file mode 100644
index 0000000..0274a37
--- /dev/null
+++ b/extensions/libct_proto_gre.c
@@ -0,0 +1,192 @@
+/*
+ * (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 <netinet/in.h> /* For htons */
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+
+#include "conntrack.h"
+
+enum {
+ CT_GRE_ORIG_SKEY = (1 << 0),
+ CT_GRE_ORIG_DKEY = (1 << 1),
+ CT_GRE_REPL_SKEY = (1 << 2),
+ CT_GRE_REPL_DKEY = (1 << 3),
+ CT_GRE_MASK_SKEY = (1 << 4),
+ CT_GRE_MASK_DKEY = (1 << 5),
+ CT_GRE_EXPTUPLE_SKEY = (1 << 6),
+ CT_GRE_EXPTUPLE_DKEY = (1 << 7)
+};
+
+#define GRE_OPT_MAX 11
+static struct option opts[GRE_OPT_MAX] = {
+ { "orig-key-src", .has_arg = 1, .val = '1' },
+ { "srckey", .has_arg = 1, .val = '1' },
+ { "orig-key-dst", .has_arg = 1, .val = '2' },
+ { "dstkey", .has_arg = 1, .val = '2' },
+ { "reply-key-src", .has_arg = 1, .val = '3' },
+ { "reply-key-dst", .has_arg = 1, .val = '4' },
+ { "mask-key-src", .has_arg = 1, .val = '5' },
+ { "mask-key-dst", .has_arg = 1, .val = '6' },
+ { "tuple-key-src", .has_arg = 1, .val = '7' },
+ { "tuple-key-dst", .has_arg = 1, .val = '8' },
+ {0, 0, 0, 0}
+};
+
+static const char *gre_optflags[GRE_OPT_MAX] = {
+ [0] = "srckey",
+ [1] = "dstkey",
+ [2] = "reply-key-src",
+ [3] = "reply-key-dst",
+ [4] = "mask-key-src",
+ [5] = "mask-key-dst",
+ [6] = "tuple-key-src",
+ [7] = "tuple-key-dst"
+};
+
+static void help(void)
+{
+ fprintf(stdout, " --orig-key-src\t\toriginal source key\n");
+ fprintf(stdout, " --orig-key-dst\t\toriginal destination key\n");
+ fprintf(stdout, " --reply-key-src\t\treply source key\n");
+ fprintf(stdout, " --reply-key-dst\t\treply destination key\n");
+ fprintf(stdout, " --mask-key-src\t\tmask source key\n");
+ fprintf(stdout, " --mask-key-dst\t\tmask destination key\n");
+ fprintf(stdout, " --tuple-key-src\t\texpectation tuple src key\n");
+ fprintf(stdout, " --tuple-key-src\t\texpectation tuple dst key\n");
+}
+
+static char gre_commands_v_options[NUMBER_OF_CMD][GRE_OPT_MAX] =
+{
+ /* 1 2 3 4 5 6 7 8 */
+/*CT_LIST*/ {2,2,2,2,0,0,0,0},
+/*CT_CREATE*/ {3,3,3,3,0,0,0,0},
+/*CT_UPDATE*/ {2,2,2,2,0,0,0,0},
+/*CT_DELETE*/ {2,2,2,2,0,0,0,0},
+/*CT_GET*/ {3,3,3,3,0,0,0,0},
+/*CT_FLUSH*/ {0,0,0,0,0,0,0,0},
+/*CT_EVENT*/ {2,2,2,2,0,0,0,0},
+/*CT_VERSION*/ {0,0,0,0,0,0,0,0},
+/*CT_HELP*/ {0,0,0,0,0,0,0,0},
+/*EXP_LIST*/ {0,0,0,0,0,0,0,0},
+/*EXP_CREATE*/ {1,1,1,1,1,1,1,1},
+/*EXP_DELETE*/ {1,1,1,1,0,0,0,0},
+/*EXP_GET*/ {1,1,1,1,0,0,0,0},
+/*EXP_FLUSH*/ {0,0,0,0,0,0,0,0},
+/*EXP_EVENT*/ {0,0,0,0,0,0,0,0},
+};
+
+static int parse_options(char c,
+ struct nf_conntrack *ct,
+ struct nf_conntrack *exptuple,
+ struct nf_conntrack *mask,
+ unsigned int *flags)
+{
+ switch(c) {
+ u_int16_t port;
+ case '1':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(ct, ATTR_ORIG_PORT_SRC, port);
+ nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_ORIG_SKEY;
+ break;
+ case '2':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(ct, ATTR_ORIG_PORT_DST, port);
+ nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_ORIG_DKEY;
+ break;
+ case '3':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(ct, ATTR_REPL_PORT_SRC, port);
+ nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_REPL_SKEY;
+ break;
+ case '4':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(ct, ATTR_REPL_PORT_DST, port);
+ nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_REPL_DKEY;
+ break;
+ case '5':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(mask, ATTR_ORIG_PORT_SRC, port);
+ nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_MASK_SKEY;
+ break;
+ case '6':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(mask, ATTR_ORIG_PORT_DST, port);
+ nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_MASK_DKEY;
+ break;
+ case '7':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_SRC, port);
+ nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_EXPTUPLE_SKEY;
+ break;
+ case '8':
+ port = htons(strtoul(optarg, NULL, 0));
+ nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_DST, port);
+ nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, IPPROTO_GRE);
+ *flags |= CT_GRE_EXPTUPLE_DKEY;
+ break;
+ }
+ return 1;
+}
+
+#define GRE_VALID_FLAGS_MAX 2
+static unsigned int gre_valid_flags[GRE_VALID_FLAGS_MAX] = {
+ CT_GRE_ORIG_SKEY | CT_GRE_ORIG_DKEY,
+ CT_GRE_REPL_SKEY | CT_GRE_REPL_DKEY,
+};
+
+static void final_check(unsigned int flags,
+ unsigned int cmd,
+ struct nf_conntrack *ct)
+{
+ int ret, partial;
+
+ ret = generic_opt_check(flags, GRE_OPT_MAX,
+ gre_commands_v_options[cmd], gre_optflags,
+ gre_valid_flags, GRE_VALID_FLAGS_MAX, &partial);
+ if (!ret) {
+ switch(partial) {
+ case -1:
+ case 0:
+ exit_error(PARAMETER_PROBLEM, "you have to specify "
+ "`--srckey' and "
+ "`--dstkey'");
+ break;
+ case 1:
+ exit_error(PARAMETER_PROBLEM, "you have to specify "
+ "`--reply-src-key' and "
+ "`--reply-dst-key'");
+ break;
+ }
+ }
+}
+
+static struct ctproto_handler gre = {
+ .name = "gre",
+ .protonum = IPPROTO_GRE,
+ .parse_opts = parse_options,
+ .final_check = final_check,
+ .help = help,
+ .opts = opts,
+ .version = VERSION,
+};
+
+void register_gre(void)
+{
+ register_proto(&gre);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 14:50:23 +0000