Initial revision

3 files changed, 345 insertions, 0 deletions

diff --git a/iptables/libipt_ULOG.c b/iptables/libipt_ULOG.c
new file mode 100644
index 0000000..f079e5f
--- /dev/null
+++ b/iptables/libipt_ULOG.c
@@ -0,0 +1,171 @@
+/* Shared library add-on to iptables to add ULOG support.
+ * 
+ * (C) 2000 by Harald Welte <laforge@sunbeam.franken.de>
+ *
+ * This software is released under the terms of GNU GPL
+ * 
+ * $Id$
+ */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ULOG.h>
+
+#define ULOG_DEFAULT_NLGROUP 1
+
+
+void print_groups(unsigned int gmask)
+{
+	int b;
+	unsigned int test;
+
+	for (b = 31; b >= 0; b--)
+	{
+		test = (1 << b);
+		if (gmask & test)
+			printf("%d ", b + 1);
+	}
+}
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+	printf(
+"ULOG v%s options:\n"
+" --ulog-nlgroup nlgroup		NETLINK grouo used for logging\n"
+" --ulog-prefix prefix		Prefix log messages with this prefix.\n\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+	{ "ulog-nlgroup", 1, 0, '!' },
+	{ "ulog-prefix", 1, 0, '#' },
+	{ 0 }
+};
+
+/* Initialize the target. */
+static void init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *)t->data;
+
+	loginfo->nl_group = ULOG_DEFAULT_NLGROUP;
+
+	/* Can't cache this */
+	*nfcache |= NFC_UNKNOWN;
+}
+
+#define IPT_LOG_OPT_NLGROUP 0x01
+#define IPT_LOG_OPT_PREFIX 0x02
+
+/* Function which parses command options; returns true if it
+   ate an option */
+static int parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      struct ipt_entry_target **target)
+{
+	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *)(*target)->data;
+	int group_d;
+
+	switch (c) {
+	case '!':
+		if (*flags & IPT_LOG_OPT_NLGROUP)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify --ulog-nlgroup twice");
+
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --ulog-nlgroup");
+		group_d = atoi(optarg);
+		if (group_d > 32 || group_d < 1)
+			exit_error(PARAMETER_PROBLEM,
+				"--ulog-nlgroup has to be between 1 and 32");
+
+		loginfo->nl_group = (1 << (group_d -1));
+
+		*flags |= IPT_LOG_OPT_NLGROUP;
+		break;
+
+	case '#':
+		if (*flags & IPT_LOG_OPT_PREFIX)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify --ulog-prefix twice");
+
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --ulog-prefix");
+
+		if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
+			exit_error(PARAMETER_PROBLEM,
+				   "Maximum prefix length %u for --ulog-prefix",
+				   sizeof(loginfo->prefix) - 1);
+
+		strcpy(loginfo->prefix, optarg);
+		*flags |= IPT_LOG_OPT_PREFIX;
+		break;
+	}
+	return 1;
+}
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+        const struct ipt_ulog_info *loginfo
+                = (const struct ipt_ulog_info *)target->data;
+
+        if (strcmp(loginfo->prefix, "") != 0)
+                printf("--ulog-prefix %s ", loginfo->prefix);
+
+        if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP)
+	{
+                printf("--ulog-nlgroup ");
+		print_groups(loginfo->nl_group);
+		printf("\n");
+	}
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+	const struct ipt_ulog_info *loginfo
+		= (const struct ipt_ulog_info *)target->data;
+
+	printf("ULOG ");
+	printf("flags %u nlgroup ",
+	       loginfo->logflags);
+	print_groups(loginfo->nl_group);
+	if (strcmp(loginfo->prefix, "") != 0)
+		printf("prefix `%s' ", loginfo->prefix);
+}
+
+struct iptables_target ulog
+= { NULL,
+    "ULOG",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_ulog_info)),
+    IPT_ALIGN(sizeof(struct ipt_ulog_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_target(&ulog);
+}
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);
diff --git a/kernel/ipt_ULOG.h b/kernel/ipt_ULOG.h
new file mode 100644
index 0000000..78ff0df
--- /dev/null
+++ b/kernel/ipt_ULOG.h
@@ -0,0 +1,36 @@
+#ifndef _IPT_ULOG_H
+#define _IPT_ULOG_H
+
+#ifdef __KERNEL__
+#include <linux/netdevice.h>
+#endif
+
+#define ULOG_MAC_LEN	80
+
+
+/* just until this is in netfilter.h */
+#ifndef NETLINK_NFLOG
+#define NETLINK_NFLOG 25
+#endif
+
+struct ipt_ulog_info {
+	unsigned char logflags;
+	unsigned int nl_group;
+	char prefix[30];
+};
+
+typedef struct ulog_packet_msg {
+        unsigned long mark;
+        long timestamp_sec;
+        long timestamp_usec;
+        unsigned int hook;
+        char indev_name[IFNAMSIZ];
+        char outdev_name[IFNAMSIZ];
+        size_t data_len;
+	char prefix[30];
+	unsigned char mac_len;
+	unsigned char mac[ULOG_MAC_LEN];
+        unsigned char payload[0];
+} ulog_packet_msg_t;
+
+#endif /*_IPT_ULOG_H*/