From 99987584cdfd3c4d52432346b407818547e9e157 Mon Sep 17 00:00:00 2001
From: laforge <laforge>
Date: Mon, 31 Jul 2000 09:08:10 +0000
Subject: Initial revision

---
 kernel/ipt_ULOG.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 kernel/ipt_ULOG.c

(limited to 'kernel/ipt_ULOG.c')

diff --git a/kernel/ipt_ULOG.c b/kernel/ipt_ULOG.c
new file mode 100644
index 0000000..06a3578
--- /dev/null
+++ b/kernel/ipt_ULOG.c
@@ -0,0 +1,138 @@
+/* 
+ * netfilter module for userspace packet logging daemons
+ *
+ * (C) 2000 by Harald Welte <laforge@sunbeam.franken.de>
+ * 
+ * Released under the terms of the GPL
+ *
+ * $Id$
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/config.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/netdevice.h>
+#include <linux/mm.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ULOG.h>
+
+#define NETLINK_NFLOG 	25
+#define ULOG_NL_EVENT	111
+
+#if 1
+#define DEBUGP	printk
+#else
+#define DEBUGP(format, args ...)
+#endif
+
+struct sock *nflognl;
+
+static void nflog_rcv(struct sock *sk, int len)
+{
+	printk("nflog_rcv: did receive netlink message ?!?\n");
+}
+
+static unsigned int ipt_ulog_target(
+	struct sk_buff **pskb,
+	unsigned int hooknum,
+	const struct net_device *in,
+	const struct net_device *out,
+	const void *targinfo,
+	void *userinfo)
+{
+	ulog_packet_msg_t *pm;
+	size_t size;
+	struct sk_buff *nlskb;
+	unsigned char *old_tail;
+	struct nlmsghdr *nlh;
+	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *)targinfo;
+
+	/* calculate the size of the skb needed */
+
+	size = NLMSG_SPACE(sizeof(*pm) + (*pskb)->len);
+	nlskb = alloc_skb(size, GFP_ATOMIC);
+	if (!nlskb)
+		goto nlmsg_failure;
+	
+	old_tail = nlskb->tail;
+	nlh = NLMSG_PUT(nlskb, 0, 0, ULOG_NL_EVENT, size - sizeof(*nlh));
+	pm = NLMSG_DATA(nlh);
+	
+	/* copy hook, prefix, timestamp, payload, etc. */
+
+	pm->data_len = (*pskb)->len;
+	pm->timestamp_sec = (*pskb)->stamp.tv_sec;
+	pm->timestamp_usec = (*pskb)->stamp.tv_usec;
+	pm->mark = (*pskb)->nfmark;
+	pm->hook = hooknum;
+	if (loginfo->prefix)
+		strcpy(pm->prefix, loginfo->prefix);
+
+	if (in && !out)
+	{
+		if ((*pskb)->dev && (*pskb)->dev->hard_header_len > 0 
+			&& (*pskb)->dev->hard_header_len <= ULOG_MAC_LEN)
+		{
+			memcpy(pm->mac, (*pskb)->mac.raw, (*pskb)->dev->hard_header_len);
+			pm->mac_len = (*pskb)->dev->hard_header_len;
+		}
+
+	}
+/*
+	if (in) strcpy(pm->indev_name, in->name);
+	else pm->indev_name[0] = '\0';
+*/
+	if ((*pskb)->len)
+		memcpy(pm->payload, (*pskb)->data, (*pskb)->len);
+	nlh->nlmsg_len = nlskb->tail - old_tail;
+	NETLINK_CB(nlskb).dst_groups = loginfo->nl_group;
+	DEBUGP("ipt_ULOG: going to throw out a packet to netlink groupmask %u\n", loginfo->nl_group);
+	netlink_broadcast(nflognl, nlskb, 0, loginfo->nl_group, GFP_ATOMIC);
+
+	return IPT_CONTINUE;
+
+nlmsg_failure:
+	if (nlskb)
+		kfree(nlskb);	
+	printk("ipt_ULOG: Error building netlink message\n");
+	return IPT_CONTINUE;
+
+}
+
+static int ipt_ulog_checkentry(
+	const char *tablename,
+	const struct ipt_entry *e,
+	void *targinfo,
+	unsigned int targinfosize,
+	unsigned int hookmask)
+{
+	return 1;
+}
+	
+
+static struct ipt_target ipt_ulog_reg =
+  { { NULL, NULL }, "ULOG", ipt_ulog_target, ipt_ulog_checkentry, NULL,
+	THIS_MODULE };
+
+static int __init init(void)
+{
+	DEBUGP("ipt_ULOG: init module\n");
+	nflognl = netlink_kernel_create(NETLINK_NFLOG, nflog_rcv);
+	if (ipt_register_target(&ipt_ulog_reg))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void __exit fini(void)
+{       
+	DEBUGP("ipt_ULOG: cleanup_module\n");
+	ipt_unregister_target(&ipt_ulog_reg);
+}
+
+module_init(init);
+module_exit(fini);
-- 
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