* [PATCH] extensions: add support for xt_TEE
2010-04-19 12:48 iptables: libxt_TEE Jan Engelhardt
@ 2010-04-19 12:48 ` Jan Engelhardt
2010-05-13 13:48 ` iptables: libxt_TEE Patrick McHardy
1 sibling, 0 replies; 3+ messages in thread
From: Jan Engelhardt @ 2010-04-19 12:48 UTC (permalink / raw)
To: kaber; +Cc: netfilter-devel
xt_TEE is firstly included in Linux 2.6.35.
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
---
extensions/libxt_TEE.c | 202 ++++++++++++++++++++++++++++++++++++++
extensions/libxt_TEE.man | 12 +++
include/linux/netfilter/xt_TEE.h | 9 ++
3 files changed, 223 insertions(+), 0 deletions(-)
create mode 100644 extensions/libxt_TEE.c
create mode 100644 extensions/libxt_TEE.man
create mode 100644 include/linux/netfilter/xt_TEE.h
diff --git a/extensions/libxt_TEE.c b/extensions/libxt_TEE.c
new file mode 100644
index 0000000..f8e7fd1
--- /dev/null
+++ b/extensions/libxt_TEE.c
@@ -0,0 +1,202 @@
+/*
+ * "TEE" target extension for iptables
+ * Copyright © Sebastian Claßen <sebastian.classen [at] freenet.ag>, 2007
+ * Jan Engelhardt <jengelh [at] medozas de>, 2007 - 2010
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License; either
+ * version 2 of the License, or any later version, as published by the
+ * Free Software Foundation.
+ */
+#include <sys/socket.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+#include <xtables.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_TEE.h>
+
+enum {
+ FLAG_GATEWAY = 1 << 0,
+ FLAG_OIF = 1 << 1,
+};
+
+static const struct option tee_tg_opts[] = {
+ {.name = "gateway", .has_arg = true, .val = 'g'},
+ {.name = "oif", .has_arg = true, .val = 'o'},
+ {NULL},
+};
+
+static void tee_tg_help(void)
+{
+ printf(
+"TEE target options:\n"
+" --gateway IPADDR Route packet via the gateway given by address\n"
+" --oif NAME Include oif in route calculation\n"
+"\n");
+}
+
+static int tee_tg_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ struct xt_tee_tginfo *info = (void *)(*target)->data;
+ const struct in_addr *ia;
+
+ switch (c) {
+ case 'g':
+ if (*flags & FLAG_GATEWAY)
+ xtables_error(PARAMETER_PROBLEM,
+ "Cannot specify --gateway more than once");
+
+ ia = xtables_numeric_to_ipaddr(optarg);
+ if (ia == NULL)
+ xtables_error(PARAMETER_PROBLEM,
+ "Invalid IP address %s", optarg);
+
+ memcpy(&info->gw, ia, sizeof(*ia));
+ *flags |= FLAG_GATEWAY;
+ return true;
+ case 'o':
+ if (*flags & FLAG_OIF)
+ xtables_error(PARAMETER_PROBLEM,
+ "Cannot specify --oif more than once");
+ if (strlen(optarg) >= sizeof(info->oif))
+ xtables_error(PARAMETER_PROBLEM,
+ "oif name too long");
+ strcpy(info->oif, optarg);
+ *flags |= FLAG_OIF;
+ return true;
+ }
+
+ return false;
+}
+
+static int tee_tg6_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ struct xt_tee_tginfo *info = (void *)(*target)->data;
+ const struct in6_addr *ia;
+
+ switch (c) {
+ case 'g':
+ if (*flags & FLAG_GATEWAY)
+ xtables_error(PARAMETER_PROBLEM,
+ "Cannot specify --gateway more than once");
+
+ ia = xtables_numeric_to_ip6addr(optarg);
+ if (ia == NULL)
+ xtables_error(PARAMETER_PROBLEM,
+ "Invalid IP address %s", optarg);
+
+ memcpy(&info->gw, ia, sizeof(*ia));
+ *flags |= FLAG_GATEWAY;
+ return true;
+ case 'o':
+ if (*flags & FLAG_OIF)
+ xtables_error(PARAMETER_PROBLEM,
+ "Cannot specify --oif more than once");
+ if (strlen(optarg) >= sizeof(info->oif))
+ xtables_error(PARAMETER_PROBLEM,
+ "oif name too long");
+ strcpy(info->oif, optarg);
+ *flags |= FLAG_OIF;
+ return true;
+ }
+
+ return false;
+}
+
+static void tee_tg_check(unsigned int flags)
+{
+ if (flags == 0)
+ xtables_error(PARAMETER_PROBLEM, "TEE target: "
+ "--gateway parameter required");
+}
+
+static void tee_tg_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct xt_tee_tginfo *info = (const void *)target->data;
+
+ if (numeric)
+ printf("TEE gw:%s ", xtables_ipaddr_to_numeric(&info->gw.in));
+ else
+ printf("TEE gw:%s ", xtables_ipaddr_to_anyname(&info->gw.in));
+ if (*info->oif != '\0')
+ printf("oif=%s ", info->oif);
+}
+
+static void tee_tg6_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct xt_tee_tginfo *info = (const void *)target->data;
+
+ if (numeric)
+ printf("TEE gw:%s ", xtables_ip6addr_to_numeric(&info->gw.in6));
+ else
+ printf("TEE gw:%s ", xtables_ip6addr_to_anyname(&info->gw.in6));
+ if (*info->oif != '\0')
+ printf("oif=%s ", info->oif);
+}
+
+static void tee_tg_save(const void *ip, const struct xt_entry_target *target)
+{
+ const struct xt_tee_tginfo *info = (const void *)target->data;
+
+ printf("--gateway %s ", xtables_ipaddr_to_numeric(&info->gw.in));
+ if (*info->oif != '\0')
+ printf("--oif %s ", info->oif);
+}
+
+static void tee_tg6_save(const void *ip, const struct xt_entry_target *target)
+{
+ const struct xt_tee_tginfo *info = (const void *)target->data;
+
+ printf("--gateway %s ", xtables_ip6addr_to_numeric(&info->gw.in6));
+ if (*info->oif != '\0')
+ printf("--oif %s ", info->oif);
+}
+
+static struct xtables_target tee_tg_reg = {
+ .name = "TEE",
+ .version = XTABLES_VERSION,
+ .revision = 1,
+ .family = NFPROTO_IPV4,
+ .size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
+ .help = tee_tg_help,
+ .parse = tee_tg_parse,
+ .final_check = tee_tg_check,
+ .print = tee_tg_print,
+ .save = tee_tg_save,
+ .extra_opts = tee_tg_opts,
+};
+
+static struct xtables_target tee_tg6_reg = {
+ .name = "TEE",
+ .version = XTABLES_VERSION,
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .size = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
+ .help = tee_tg_help,
+ .parse = tee_tg6_parse,
+ .final_check = tee_tg_check,
+ .print = tee_tg6_print,
+ .save = tee_tg6_save,
+ .extra_opts = tee_tg_opts,
+};
+
+static __attribute__((constructor)) void tee_tg_ldr(void)
+{
+ xtables_register_target(&tee_tg_reg);
+ xtables_register_target(&tee_tg6_reg);
+}
diff --git a/extensions/libxt_TEE.man b/extensions/libxt_TEE.man
new file mode 100644
index 0000000..456d150
--- /dev/null
+++ b/extensions/libxt_TEE.man
@@ -0,0 +1,12 @@
+The \fBTEE\fP target will clone a packet and redirect this clone to another
+machine on the \fBlocal\fP network segment. In other words, the nexthop
+must be the target, or you will have to configure the nexthop to forward it
+further if so desired.
+.TP
+\fB\-\-gateway\fP \fIipaddr\fP
+Send the cloned packet to the host reachable at the given IP address.
+Use of 0.0.0.0 (for IPv4 packets) or :: (IPv6) is invalid.
+.PP
+To forward all incoming traffic on eth0 to an Network Layer logging box:
+.PP
+\-t mangle \-A PREROUTING \-i eth0 \-j TEE \-\-gateway 2001:db8::1
diff --git a/include/linux/netfilter/xt_TEE.h b/include/linux/netfilter/xt_TEE.h
new file mode 100644
index 0000000..55d4a50
--- /dev/null
+++ b/include/linux/netfilter/xt_TEE.h
@@ -0,0 +1,9 @@
+#ifndef _XT_TEE_TARGET_H
+#define _XT_TEE_TARGET_H
+
+struct xt_tee_tginfo {
+ union nf_inet_addr gw;
+ char oif[16];
+};
+
+#endif /* _XT_TEE_TARGET_H */
--
1.7.0.5
--
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