[NETFILTER]: bridge: add ebt_nflog watcher
This patch adds the ebtables nflog watcher to the kernel in order to
allow ebtables log through the nfnetlink_log backend.
Signed-off-by: Peter Warasin <peter@xxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
commit 7649b4aade16e08fc9024467d5bfdfc885425961
tree d92aad7aac50c41e0fbcae3cb41d03bd82d9ab40
parent ed85c857b1339f605b1668f7bb185d8e19c172d1
author Peter Warasin <peter@xxxxxxxxxx> Mon, 14 Apr 2008 12:10:57 +0200
committer Patrick McHardy <kaber@xxxxxxxxx> Mon, 14 Apr 2008 12:10:57 +0200
include/linux/netfilter_bridge/ebt_nflog.h | 21 ++++++++
net/bridge/netfilter/Kconfig | 14 +++++
net/bridge/netfilter/Makefile | 1
net/bridge/netfilter/ebt_nflog.c | 74 ++++++++++++++++++++++++++++
4 files changed, 110 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter_bridge/ebt_nflog.h b/include/linux/netfilter_bridge/ebt_nflog.h
new file mode 100644
index 0000000..0528178
--- /dev/null
+++ b/include/linux/netfilter_bridge/ebt_nflog.h
@@ -0,0 +1,21 @@
+#ifndef __LINUX_BRIDGE_EBT_NFLOG_H
+#define __LINUX_BRIDGE_EBT_NFLOG_H
+
+#define EBT_NFLOG_MASK 0x0
+
+#define EBT_NFLOG_PREFIX_SIZE 64
+#define EBT_NFLOG_WATCHER "nflog"
+
+#define EBT_NFLOG_DEFAULT_GROUP 0x1
+#define EBT_NFLOG_DEFAULT_THRESHOLD 1
+
+struct ebt_nflog_info {
+ u_int32_t len;
+ u_int16_t group;
+ u_int16_t threshold;
+ u_int16_t flags;
+ u_int16_t pad;
+ char prefix[EBT_NFLOG_PREFIX_SIZE];
+};
+
+#endif /* __LINUX_BRIDGE_EBT_NFLOG_H */
diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index 4a3e2bf..7beeefa 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -212,4 +212,18 @@ config BRIDGE_EBT_ULOG
To compile it as a module, choose M here. If unsure, say N.
+config BRIDGE_EBT_NFLOG
+ tristate "ebt: nflog support"
+ depends on BRIDGE_NF_EBTABLES
+ help
+ This option enables the nflog watcher, which allows to LOG
+ messages through the netfilter logging API, which can use
+ either the old LOG target, the old ULOG target or nfnetlink_log
+ as backend.
+
+ This option adds the ulog watcher, that you can use in any rule
+ in any ebtables table.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
endmenu
diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile
index 905087e..83715d7 100644
--- a/net/bridge/netfilter/Makefile
+++ b/net/bridge/netfilter/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
# watchers
obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
obj-$(CONFIG_BRIDGE_EBT_ULOG) += ebt_ulog.o
+obj-$(CONFIG_BRIDGE_EBT_NFLOG) += ebt_nflog.o
diff --git a/net/bridge/netfilter/ebt_nflog.c b/net/bridge/netfilter/ebt_nflog.c
new file mode 100644
index 0000000..8e799aa
--- /dev/null
+++ b/net/bridge/netfilter/ebt_nflog.c
@@ -0,0 +1,74 @@
+/*
+ * ebt_nflog
+ *
+ * Author:
+ * Peter Warasin <peter@xxxxxxxxxx>
+ *
+ * February, 2008
+ *
+ * Based on:
+ * xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@xxxxxxxxx>
+ * ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@xxxxxxxxxx>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_nflog.h>
+#include <net/netfilter/nf_log.h>
+
+static void ebt_nflog(const struct sk_buff *skb,
+ unsigned int hooknr,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *data, unsigned int datalen)
+{
+ struct ebt_nflog_info *info = (struct ebt_nflog_info *)data;
+ struct nf_loginfo li;
+
+ li.type = NF_LOG_TYPE_ULOG;
+ li.u.ulog.copy_len = info->len;
+ li.u.ulog.group = info->group;
+ li.u.ulog.qthreshold = info->threshold;
+
+ nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li, "%s", info->prefix);
+}
+
+static int ebt_nflog_check(const char *tablename,
+ unsigned int hookmask,
+ const struct ebt_entry *e,
+ void *data, unsigned int datalen)
+{
+ struct ebt_nflog_info *info = (struct ebt_nflog_info *)data;
+
+ if (datalen != EBT_ALIGN(sizeof(struct ebt_nflog_info)))
+ return -EINVAL;
+ if (info->flags & ~EBT_NFLOG_MASK)
+ return -EINVAL;
+ info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
+ return 0;
+}
+
+static struct ebt_watcher nflog __read_mostly = {
+ .name = EBT_NFLOG_WATCHER,
+ .watcher = ebt_nflog,
+ .check = ebt_nflog_check,
+ .me = THIS_MODULE,
+};
+
+static int __init ebt_nflog_init(void)
+{
+ return ebt_register_watcher(&nflog);
+}
+
+static void __exit ebt_nflog_fini(void)
+{
+ ebt_unregister_watcher(&nflog);
+}
+
+module_init(ebt_nflog_init);
+module_exit(ebt_nflog_fini);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter Warasin <peter@xxxxxxxxxx>");
+MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module");
--
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